drivers/android/binder.c

   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <asm/cacheflush.h>
  21 #include <linux/atomic.h>
  22 #include <linux/fdtable.h>
  23 #include <linux/file.h>
  24 #include <linux/freezer.h>
  25 #include <linux/fs.h>
  26 #include <linux/list.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/mm.h>
  29 #include <linux/module.h>
  30 #include <linux/mutex.h>
  31 #include <linux/nsproxy.h>
  32 #include <linux/poll.h>
  33 #include <linux/debugfs.h>
  34 #include <linux/rbtree.h>
  35 #include <linux/sched.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/slab.h>
  40 #include <linux/pid_namespace.h>
  41 #include <linux/security.h>
  42
  43 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  44 #define BINDER_IPC_32BIT 1
  45 #endif
  46
  47 #include <uapi/linux/android/binder.h>
  48 #include "binder_trace.h"
  49
  50 static HLIST_HEAD(binder_devices);
  51
  52 static struct dentry *binder_debugfs_dir_entry_root;
  53 static struct dentry *binder_debugfs_dir_entry_proc;
  54 atomic_t binder_last_id;
  55
  56 #define BINDER_DEBUG_ENTRY(name) \
  57 static int binder_##name##_open(struct inode *inode, struct file *file) \
  58 { \
  59         return single_open(file, binder_##name##_show, inode->i_private); \
  60 } \
  61 \
  62 static const struct file_operations binder_##name##_fops = { \
  63         .owner = THIS_MODULE, \
  64         .open = binder_##name##_open, \
  65         .read = seq_read, \
  66         .llseek = seq_lseek, \
  67         .release = single_release, \
  68 }
  69
  70 static int binder_proc_show(struct seq_file *m, void *unused);
  71 BINDER_DEBUG_ENTRY(proc);
  72
  73 /* This is only defined in include/asm-arm/sizes.h */
  74 #ifndef SZ_1K
  75 #define SZ_1K                               0x400
  76 #endif
  77
  78 #ifndef SZ_4M
  79 #define SZ_4M                               0x400000
  80 #endif
  81
  82 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  83
  84 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  85
  86 enum {
  87         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  88         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  89         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  90         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  91         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  92         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
  93         BINDER_DEBUG_READ_WRITE             = 1U << 6,
  94         BINDER_DEBUG_USER_REFS              = 1U << 7,
  95         BINDER_DEBUG_THREADS                = 1U << 8,
  96         BINDER_DEBUG_TRANSACTION            = 1U << 9,
  97         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
  98         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
  99         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 100         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 101         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 102         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 103 };
 104 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 105         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 106 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 107
 108 static bool binder_debug_no_lock;
 109 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 110
 111 static char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;
 112 module_param_named(devices, binder_devices_param, charp, S_IRUGO);
 113
 114 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 115 static int binder_stop_on_user_error;
 116
 117 static int binder_set_stop_on_user_error(const char *val,
 118                                          struct kernel_param *kp)
 119 {
 120         int ret;
 121
 122         ret = param_set_int(val, kp);
 123         if (binder_stop_on_user_error < 2)
 124                 wake_up(&binder_user_error_wait);
 125         return ret;
 126 }
 127 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 128         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 129
 130 #define binder_debug(mask, x...) \
 131         do { \
 132                 if (binder_debug_mask & mask) \
 133                         pr_info(x); \
 134         } while (0)
 135
 136 #define binder_user_error(x...) \
 137         do { \
 138                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 139                         pr_info(x); \
 140                 if (binder_stop_on_user_error) \
 141                         binder_stop_on_user_error = 2; \
 142         } while (0)
 143
 144 #define to_flat_binder_object(hdr) \
 145         container_of(hdr, struct flat_binder_object, hdr)
 146
 147 #define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr)
 148
 149 #define to_binder_buffer_object(hdr) \
 150         container_of(hdr, struct binder_buffer_object, hdr)
 151
 152 #define to_binder_fd_array_object(hdr) \
 153         container_of(hdr, struct binder_fd_array_object, hdr)
 154
 155 enum binder_stat_types {
 156         BINDER_STAT_PROC,
 157         BINDER_STAT_THREAD,
 158         BINDER_STAT_NODE,
 159         BINDER_STAT_REF,
 160         BINDER_STAT_DEATH,
 161         BINDER_STAT_TRANSACTION,
 162         BINDER_STAT_TRANSACTION_COMPLETE,
 163         BINDER_STAT_COUNT
 164 };
 165
 166 struct binder_stats {
 167         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 168         int bc[_IOC_NR(BC_REPLY_SG) + 1];
 169 };
 170
 171 /* These are still global, since it's not always easy to get the context */
 172 struct binder_obj_stats {
 173         atomic_t obj_created[BINDER_STAT_COUNT];
 174         atomic_t obj_deleted[BINDER_STAT_COUNT];
 175 };
 176
 177 static struct binder_obj_stats binder_obj_stats;
 178
 179 static inline void binder_stats_deleted(enum binder_stat_types type)
 180 {
 181         atomic_inc(&binder_obj_stats.obj_deleted[type]);
 182 }
 183
 184 static inline void binder_stats_created(enum binder_stat_types type)
 185 {
 186         atomic_inc(&binder_obj_stats.obj_created[type]);
 187 }
 188
 189 struct binder_transaction_log_entry {
 190         int debug_id;
 191         int call_type;
 192         int from_proc;
 193         int from_thread;
 194         int target_handle;
 195         int to_proc;
 196         int to_thread;
 197         int to_node;
 198         int data_size;
 199         int offsets_size;
 200         const char *context_name;
 201 };
 202 struct binder_transaction_log {
 203         int next;
 204         int full;
 205         struct binder_transaction_log_entry entry[32];
 206 };
 207
 208 static struct binder_transaction_log_entry *binder_transaction_log_add(
 209         struct binder_transaction_log *log)
 210 {
 211         struct binder_transaction_log_entry *e;
 212
 213         e = &log->entry[log->next];
 214         memset(e, 0, sizeof(*e));
 215         log->next++;
 216         if (log->next == ARRAY_SIZE(log->entry)) {
 217                 log->next = 0;
 218                 log->full = 1;
 219         }
 220         return e;
 221 }
 222
 223 struct binder_context {
 224         struct binder_node *binder_context_mgr_node;
 225         kuid_t binder_context_mgr_uid;
 226         const char *name;
 227
 228         struct mutex binder_main_lock;
 229         struct mutex binder_deferred_lock;
 230         struct mutex binder_mmap_lock;
 231
 232         struct hlist_head binder_procs;
 233         struct hlist_head binder_dead_nodes;
 234         struct hlist_head binder_deferred_list;
 235
 236         struct work_struct deferred_work;
 237         struct workqueue_struct *binder_deferred_workqueue;
 238         struct binder_transaction_log transaction_log;
 239         struct binder_transaction_log transaction_log_failed;
 240
 241         struct binder_stats binder_stats;
 242 };
 243
 244 struct binder_device {
 245         struct hlist_node hlist;
 246         struct miscdevice miscdev;
 247         struct binder_context context;
 248 };
 249
 250 struct binder_work {
 251         struct list_head entry;
 252         enum {
 253                 BINDER_WORK_TRANSACTION = 1,
 254                 BINDER_WORK_TRANSACTION_COMPLETE,
 255                 BINDER_WORK_NODE,
 256                 BINDER_WORK_DEAD_BINDER,
 257                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 258                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 259         } type;
 260 };
 261
 262 struct binder_node {
 263         int debug_id;
 264         struct binder_work work;
 265         union {
 266                 struct rb_node rb_node;
 267                 struct hlist_node dead_node;
 268         };
 269         struct binder_proc *proc;
 270         struct hlist_head refs;
 271         int internal_strong_refs;
 272         int local_weak_refs;
 273         int local_strong_refs;
 274         binder_uintptr_t ptr;
 275         binder_uintptr_t cookie;
 276         unsigned has_strong_ref:1;
 277         unsigned pending_strong_ref:1;
 278         unsigned has_weak_ref:1;
 279         unsigned pending_weak_ref:1;
 280         unsigned has_async_transaction:1;
 281         unsigned accept_fds:1;
 282         unsigned min_priority:8;
 283         struct list_head async_todo;
 284 };
 285
 286 struct binder_ref_death {
 287         struct binder_work work;
 288         binder_uintptr_t cookie;
 289 };
 290
 291 struct binder_ref {
 292         /* Lookups needed: */
 293         /*   node + proc => ref (transaction) */
 294         /*   desc + proc => ref (transaction, inc/dec ref) */
 295         /*   node => refs + procs (proc exit) */
 296         int debug_id;
 297         struct rb_node rb_node_desc;
 298         struct rb_node rb_node_node;
 299         struct hlist_node node_entry;
 300         struct binder_proc *proc;
 301         struct binder_node *node;
 302         uint32_t desc;
 303         int strong;
 304         int weak;
 305         struct binder_ref_death *death;
 306 };
 307
 308 struct binder_buffer {
 309         struct list_head entry; /* free and allocated entries by address */
 310         struct rb_node rb_node; /* free entry by size or allocated entry */
 311                                 /* by address */
 312         unsigned free:1;
 313         unsigned allow_user_free:1;
 314         unsigned async_transaction:1;
 315         unsigned debug_id:29;
 316
 317         struct binder_transaction *transaction;
 318
 319         struct binder_node *target_node;
 320         size_t data_size;
 321         size_t offsets_size;
 322         size_t extra_buffers_size;
 323         uint8_t data[0];
 324 };
 325
 326 enum binder_deferred_state {
 327         BINDER_DEFERRED_PUT_FILES    = 0x01,
 328         BINDER_DEFERRED_FLUSH        = 0x02,
 329         BINDER_DEFERRED_RELEASE      = 0x04,
 330 };
 331
 332 struct binder_proc {
 333         struct hlist_node proc_node;
 334         struct rb_root threads;
 335         struct rb_root nodes;
 336         struct rb_root refs_by_desc;
 337         struct rb_root refs_by_node;
 338         int pid;
 339         struct vm_area_struct *vma;
 340         struct mm_struct *vma_vm_mm;
 341         struct task_struct *tsk;
 342         struct files_struct *files;
 343         struct hlist_node deferred_work_node;
 344         int deferred_work;
 345         void *buffer;
 346         ptrdiff_t user_buffer_offset;
 347
 348         struct list_head buffers;
 349         struct rb_root free_buffers;
 350         struct rb_root allocated_buffers;
 351         size_t free_async_space;
 352
 353         struct page **pages;
 354         size_t buffer_size;
 355         uint32_t buffer_free;
 356         struct list_head todo;
 357         wait_queue_head_t wait;
 358         struct binder_stats stats;
 359         struct list_head delivered_death;
 360         int max_threads;
 361         int requested_threads;
 362         int requested_threads_started;
 363         int ready_threads;
 364         long default_priority;
 365         struct dentry *debugfs_entry;
 366         struct binder_context *context;
 367 };
 368
 369 enum {
 370         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 371         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 372         BINDER_LOOPER_STATE_EXITED      = 0x04,
 373         BINDER_LOOPER_STATE_INVALID     = 0x08,
 374         BINDER_LOOPER_STATE_WAITING     = 0x10,
 375         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 376 };
 377
 378 struct binder_thread {
 379         struct binder_proc *proc;
 380         struct rb_node rb_node;
 381         int pid;
 382         int looper;
 383         struct binder_transaction *transaction_stack;
 384         struct list_head todo;
 385         uint32_t return_error; /* Write failed, return error code in read buf */
 386         uint32_t return_error2; /* Write failed, return error code in read */
 387                 /* buffer. Used when sending a reply to a dead process that */
 388                 /* we are also waiting on */
 389         wait_queue_head_t wait;
 390         struct binder_stats stats;
 391 };
 392
 393 struct binder_transaction {
 394         int debug_id;
 395         struct binder_work work;
 396         struct binder_thread *from;
 397         struct binder_transaction *from_parent;
 398         struct binder_proc *to_proc;
 399         struct binder_thread *to_thread;
 400         struct binder_transaction *to_parent;
 401         unsigned need_reply:1;
 402         /* unsigned is_dead:1; */       /* not used at the moment */
 403
 404         struct binder_buffer *buffer;
 405         unsigned int    code;
 406         unsigned int    flags;
 407         long    priority;
 408         long    saved_priority;
 409         kuid_t  sender_euid;
 410 };
 411
 412 static void
 413 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 414
 415 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 416 {
 417         struct files_struct *files = proc->files;
 418         unsigned long rlim_cur;
 419         unsigned long irqs;
 420         int ret;
 421
 422         if (files == NULL)
 423                 return -ESRCH;
 424
 425         if (!lock_task_sighand(proc->tsk, &irqs))
 426                 return -EMFILE;
 427
 428         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 429         unlock_task_sighand(proc->tsk, &irqs);
 430
 431         preempt_enable_no_resched();
 432         ret = __alloc_fd(files, 0, rlim_cur, flags);
 433         preempt_disable();
 434
 435         return ret;
 436 }
 437
 438 /*
 439  * copied from fd_install
 440  */
 441 static void task_fd_install(
 442         struct binder_proc *proc, unsigned int fd, struct file *file)
 443 {
 444         if (proc->files) {
 445                 preempt_enable_no_resched();
 446                 __fd_install(proc->files, fd, file);
 447                 preempt_disable();
 448         }
 449 }
 450
 451 /*
 452  * copied from sys_close
 453  */
 454 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 455 {
 456         int retval;
 457
 458         if (proc->files == NULL)
 459                 return -ESRCH;
 460
 461         retval = __close_fd(proc->files, fd);
 462         /* can't restart close syscall because file table entry was cleared */
 463         if (unlikely(retval == -ERESTARTSYS ||
 464                      retval == -ERESTARTNOINTR ||
 465                      retval == -ERESTARTNOHAND ||
 466                      retval == -ERESTART_RESTARTBLOCK))
 467                 retval = -EINTR;
 468
 469         return retval;
 470 }
 471
 472 static inline void binder_lock(struct binder_context *context, const char *tag)
 473 {
 474         trace_binder_lock(tag);
 475         mutex_lock(&context->binder_main_lock);
 476         trace_binder_locked(tag);
 477 }
 478
 479 static inline void binder_unlock(struct binder_context *context,
 480                                  const char *tag)
 481 {
 482         trace_binder_unlock(tag);
 483         mutex_unlock(&context->binder_main_lock);
 484 }
 485
 486 static void binder_set_nice(long nice)
 487 {
 488         long min_nice;
 489
 490         if (can_nice(current, nice)) {
 491                 set_user_nice(current, nice);
 492                 return;
 493         }
 494         min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
 495         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 496                      "%d: nice value %ld not allowed use %ld instead\n",
 497                       current->pid, nice, min_nice);
 498         set_user_nice(current, min_nice);
 499         if (min_nice <= MAX_NICE)
 500                 return;
 501         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 502 }
 503
 504 static size_t binder_buffer_size(struct binder_proc *proc,
 505                                  struct binder_buffer *buffer)
 506 {
 507         if (list_is_last(&buffer->entry, &proc->buffers))
 508                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 509         return (size_t)list_entry(buffer->entry.next,
 510                           struct binder_buffer, entry) - (size_t)buffer->data;
 511 }
 512
 513 static void binder_insert_free_buffer(struct binder_proc *proc,
 514                                       struct binder_buffer *new_buffer)
 515 {
 516         struct rb_node **p = &proc->free_buffers.rb_node;
 517         struct rb_node *parent = NULL;
 518         struct binder_buffer *buffer;
 519         size_t buffer_size;
 520         size_t new_buffer_size;
 521
 522         BUG_ON(!new_buffer->free);
 523
 524         new_buffer_size = binder_buffer_size(proc, new_buffer);
 525
 526         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 527                      "%d: add free buffer, size %zd, at %p\n",
 528                       proc->pid, new_buffer_size, new_buffer);
 529
 530         while (*p) {
 531                 parent = *p;
 532                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 533                 BUG_ON(!buffer->free);
 534
 535                 buffer_size = binder_buffer_size(proc, buffer);
 536
 537                 if (new_buffer_size < buffer_size)
 538                         p = &parent->rb_left;
 539                 else
 540                         p = &parent->rb_right;
 541         }
 542         rb_link_node(&new_buffer->rb_node, parent, p);
 543         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 544 }
 545
 546 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 547                                            struct binder_buffer *new_buffer)
 548 {
 549         struct rb_node **p = &proc->allocated_buffers.rb_node;
 550         struct rb_node *parent = NULL;
 551         struct binder_buffer *buffer;
 552
 553         BUG_ON(new_buffer->free);
 554
 555         while (*p) {
 556                 parent = *p;
 557                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 558                 BUG_ON(buffer->free);
 559
 560                 if (new_buffer < buffer)
 561                         p = &parent->rb_left;
 562                 else if (new_buffer > buffer)
 563                         p = &parent->rb_right;
 564                 else
 565                         BUG();
 566         }
 567         rb_link_node(&new_buffer->rb_node, parent, p);
 568         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 569 }
 570
 571 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 572                                                   uintptr_t user_ptr)
 573 {
 574         struct rb_node *n = proc->allocated_buffers.rb_node;
 575         struct binder_buffer *buffer;
 576         struct binder_buffer *kern_ptr;
 577
 578         kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 579                 - offsetof(struct binder_buffer, data));
 580
 581         while (n) {
 582                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 583                 BUG_ON(buffer->free);
 584
 585                 if (kern_ptr < buffer)
 586                         n = n->rb_left;
 587                 else if (kern_ptr > buffer)
 588                         n = n->rb_right;
 589                 else
 590                         return buffer;
 591         }
 592         return NULL;
 593 }
 594
 595 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 596                                     void *start, void *end,
 597                                     struct vm_area_struct *vma)
 598 {
 599         void *page_addr;
 600         unsigned long user_page_addr;
 601         struct page **page;
 602         struct mm_struct *mm;
 603
 604         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 605                      "%d: %s pages %p-%p\n", proc->pid,
 606                      allocate ? "allocate" : "free", start, end);
 607
 608         if (end <= start)
 609                 return 0;
 610
 611         trace_binder_update_page_range(proc, allocate, start, end);
 612
 613         if (vma)
 614                 mm = NULL;
 615         else
 616                 mm = get_task_mm(proc->tsk);
 617
 618         if (mm) {
 619                 down_write(&mm->mmap_sem);
 620                 vma = proc->vma;
 621                 if (vma && mm != proc->vma_vm_mm) {
 622                         pr_err("%d: vma mm and task mm mismatch\n",
 623                                 proc->pid);
 624                         vma = NULL;
 625                 }
 626         }
 627
 628         if (allocate == 0)
 629                 goto free_range;
 630
 631         if (vma == NULL) {
 632                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 633                         proc->pid);
 634                 goto err_no_vma;
 635         }
 636
 637         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 638                 int ret;
 639
 640                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 641
 642                 BUG_ON(*page);
 643                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 644                 if (*page == NULL) {
 645                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
 646                                 proc->pid, page_addr);
 647                         goto err_alloc_page_failed;
 648                 }
 649                 ret = map_kernel_range_noflush((unsigned long)page_addr,
 650                                         PAGE_SIZE, PAGE_KERNEL, page);
 651                 flush_cache_vmap((unsigned long)page_addr,
 652                                 (unsigned long)page_addr + PAGE_SIZE);
 653                 if (ret != 1) {
 654                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 655                                proc->pid, page_addr);
 656                         goto err_map_kernel_failed;
 657                 }
 658                 user_page_addr =
 659                         (uintptr_t)page_addr + proc->user_buffer_offset;
 660                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 661                 if (ret) {
 662                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 663                                proc->pid, user_page_addr);
 664                         goto err_vm_insert_page_failed;
 665                 }
 666                 /* vm_insert_page does not seem to increment the refcount */
 667         }
 668         if (mm) {
 669                 up_write(&mm->mmap_sem);
 670                 mmput(mm);
 671         }
 672         return 0;
 673
 674 free_range:
 675         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 676              page_addr -= PAGE_SIZE) {
 677                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 678                 if (vma)
 679                         zap_page_range(vma, (uintptr_t)page_addr +
 680                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 681 err_vm_insert_page_failed:
 682                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 683 err_map_kernel_failed:
 684                 __free_page(*page);
 685                 *page = NULL;
 686 err_alloc_page_failed:
 687                 ;
 688         }
 689 err_no_vma:
 690         if (mm) {
 691                 up_write(&mm->mmap_sem);
 692                 mmput(mm);
 693         }
 694         return -ENOMEM;
 695 }
 696
 697 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 698                                               size_t data_size,
 699                                               size_t offsets_size,
 700                                               size_t extra_buffers_size,
 701                                               int is_async)
 702 {
 703         struct rb_node *n = proc->free_buffers.rb_node;
 704         struct binder_buffer *buffer;
 705         size_t buffer_size;
 706         struct rb_node *best_fit = NULL;
 707         void *has_page_addr;
 708         void *end_page_addr;
 709         size_t size, data_offsets_size;
 710
 711         if (proc->vma == NULL) {
 712                 pr_err("%d: binder_alloc_buf, no vma\n",
 713                        proc->pid);
 714                 return NULL;
 715         }
 716
 717         data_offsets_size = ALIGN(data_size, sizeof(void *)) +
 718                 ALIGN(offsets_size, sizeof(void *));
 719
 720         if (data_offsets_size < data_size || data_offsets_size < offsets_size) {
 721                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 722                                 proc->pid, data_size, offsets_size);
 723                 return NULL;
 724         }
 725         size = data_offsets_size + ALIGN(extra_buffers_size, sizeof(void *));
 726         if (size < data_offsets_size || size < extra_buffers_size) {
 727                 binder_user_error("%d: got transaction with invalid extra_buffers_size %zd\n",
 728                                   proc->pid, extra_buffers_size);
 729                 return NULL;
 730         }
 731         if (is_async &&
 732             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 733                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 734                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 735                               proc->pid, size);
 736                 return NULL;
 737         }
 738
 739         while (n) {
 740                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 741                 BUG_ON(!buffer->free);
 742                 buffer_size = binder_buffer_size(proc, buffer);
 743
 744                 if (size < buffer_size) {
 745                         best_fit = n;
 746                         n = n->rb_left;
 747                 } else if (size > buffer_size)
 748                         n = n->rb_right;
 749                 else {
 750                         best_fit = n;
 751                         break;
 752                 }
 753         }
 754         if (best_fit == NULL) {
 755                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 756                         proc->pid, size);
 757                 return NULL;
 758         }
 759         if (n == NULL) {
 760                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 761                 buffer_size = binder_buffer_size(proc, buffer);
 762         }
 763
 764         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 765                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 766                       proc->pid, size, buffer, buffer_size);
 767
 768         has_page_addr =
 769                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 770         if (n == NULL) {
 771                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 772                         buffer_size = size; /* no room for other buffers */
 773                 else
 774                         buffer_size = size + sizeof(struct binder_buffer);
 775         }
 776         end_page_addr =
 777                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 778         if (end_page_addr > has_page_addr)
 779                 end_page_addr = has_page_addr;
 780         if (binder_update_page_range(proc, 1,
 781             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 782                 return NULL;
 783
 784         rb_erase(best_fit, &proc->free_buffers);
 785         buffer->free = 0;
 786         binder_insert_allocated_buffer(proc, buffer);
 787         if (buffer_size != size) {
 788                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 789
 790                 list_add(&new_buffer->entry, &buffer->entry);
 791                 new_buffer->free = 1;
 792                 binder_insert_free_buffer(proc, new_buffer);
 793         }
 794         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 795                      "%d: binder_alloc_buf size %zd got %p\n",
 796                       proc->pid, size, buffer);
 797         buffer->data_size = data_size;
 798         buffer->offsets_size = offsets_size;
 799         buffer->extra_buffers_size = extra_buffers_size;
 800         buffer->async_transaction = is_async;
 801         if (is_async) {
 802                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 803                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 804                              "%d: binder_alloc_buf size %zd async free %zd\n",
 805                               proc->pid, size, proc->free_async_space);
 806         }
 807
 808         return buffer;
 809 }
 810
 811 static void *buffer_start_page(struct binder_buffer *buffer)
 812 {
 813         return (void *)((uintptr_t)buffer & PAGE_MASK);
 814 }
 815
 816 static void *buffer_end_page(struct binder_buffer *buffer)
 817 {
 818         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 819 }
 820
 821 static void binder_delete_free_buffer(struct binder_proc *proc,
 822                                       struct binder_buffer *buffer)
 823 {
 824         struct binder_buffer *prev, *next = NULL;
 825         int free_page_end = 1;
 826         int free_page_start = 1;
 827
 828         BUG_ON(proc->buffers.next == &buffer->entry);
 829         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 830         BUG_ON(!prev->free);
 831         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 832                 free_page_start = 0;
 833                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 834                         free_page_end = 0;
 835                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 836                              "%d: merge free, buffer %p share page with %p\n",
 837                               proc->pid, buffer, prev);
 838         }
 839
 840         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 841                 next = list_entry(buffer->entry.next,
 842                                   struct binder_buffer, entry);
 843                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 844                         free_page_end = 0;
 845                         if (buffer_start_page(next) ==
 846                             buffer_start_page(buffer))
 847                                 free_page_start = 0;
 848                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 849                                      "%d: merge free, buffer %p share page with %p\n",
 850                                       proc->pid, buffer, prev);
 851                 }
 852         }
 853         list_del(&buffer->entry);
 854         if (free_page_start || free_page_end) {
 855                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 856                              "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 857                              proc->pid, buffer, free_page_start ? "" : " end",
 858                              free_page_end ? "" : " start", prev, next);
 859                 binder_update_page_range(proc, 0, free_page_start ?
 860                         buffer_start_page(buffer) : buffer_end_page(buffer),
 861                         (free_page_end ? buffer_end_page(buffer) :
 862                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 863         }
 864 }
 865
 866 static void binder_free_buf(struct binder_proc *proc,
 867                             struct binder_buffer *buffer)
 868 {
 869         size_t size, buffer_size;
 870
 871         buffer_size = binder_buffer_size(proc, buffer);
 872
 873         size = ALIGN(buffer->data_size, sizeof(void *)) +
 874                 ALIGN(buffer->offsets_size, sizeof(void *)) +
 875                 ALIGN(buffer->extra_buffers_size, sizeof(void *));
 876
 877         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 878                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 879                       proc->pid, buffer, size, buffer_size);
 880
 881         BUG_ON(buffer->free);
 882         BUG_ON(size > buffer_size);
 883         BUG_ON(buffer->transaction != NULL);
 884         BUG_ON((void *)buffer < proc->buffer);
 885         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 886
 887         if (buffer->async_transaction) {
 888                 proc->free_async_space += size + sizeof(struct binder_buffer);
 889
 890                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 891                              "%d: binder_free_buf size %zd async free %zd\n",
 892                               proc->pid, size, proc->free_async_space);
 893         }
 894
 895         binder_update_page_range(proc, 0,
 896                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 897                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 898                 NULL);
 899         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 900         buffer->free = 1;
 901         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 902                 struct binder_buffer *next = list_entry(buffer->entry.next,
 903                                                 struct binder_buffer, entry);
 904
 905                 if (next->free) {
 906                         rb_erase(&next->rb_node, &proc->free_buffers);
 907                         binder_delete_free_buffer(proc, next);
 908                 }
 909         }
 910         if (proc->buffers.next != &buffer->entry) {
 911                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 912                                                 struct binder_buffer, entry);
 913
 914                 if (prev->free) {
 915                         binder_delete_free_buffer(proc, buffer);
 916                         rb_erase(&prev->rb_node, &proc->free_buffers);
 917                         buffer = prev;
 918                 }
 919         }
 920         binder_insert_free_buffer(proc, buffer);
 921 }
 922
 923 static struct binder_node *binder_get_node(struct binder_proc *proc,
 924                                            binder_uintptr_t ptr)
 925 {
 926         struct rb_node *n = proc->nodes.rb_node;
 927         struct binder_node *node;
 928
 929         while (n) {
 930                 node = rb_entry(n, struct binder_node, rb_node);
 931
 932                 if (ptr < node->ptr)
 933                         n = n->rb_left;
 934                 else if (ptr > node->ptr)
 935                         n = n->rb_right;
 936                 else
 937                         return node;
 938         }
 939         return NULL;
 940 }
 941
 942 static struct binder_node *binder_new_node(struct binder_proc *proc,
 943                                            binder_uintptr_t ptr,
 944                                            binder_uintptr_t cookie)
 945 {
 946         struct rb_node **p = &proc->nodes.rb_node;
 947         struct rb_node *parent = NULL;
 948         struct binder_node *node;
 949
 950         while (*p) {
 951                 parent = *p;
 952                 node = rb_entry(parent, struct binder_node, rb_node);
 953
 954                 if (ptr < node->ptr)
 955                         p = &(*p)->rb_left;
 956                 else if (ptr > node->ptr)
 957                         p = &(*p)->rb_right;
 958                 else
 959                         return NULL;
 960         }
 961
 962         node = kzalloc(sizeof(*node), GFP_KERNEL);
 963         if (node == NULL)
 964                 return NULL;
 965         binder_stats_created(BINDER_STAT_NODE);
 966         rb_link_node(&node->rb_node, parent, p);
 967         rb_insert_color(&node->rb_node, &proc->nodes);
 968         node->debug_id = atomic_inc_return(&binder_last_id);
 969         node->proc = proc;
 970         node->ptr = ptr;
 971         node->cookie = cookie;
 972         node->work.type = BINDER_WORK_NODE;
 973         INIT_LIST_HEAD(&node->work.entry);
 974         INIT_LIST_HEAD(&node->async_todo);
 975         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 976                      "%d:%d node %d u%016llx c%016llx created\n",
 977                      proc->pid, current->pid, node->debug_id,
 978                      (u64)node->ptr, (u64)node->cookie);
 979         return node;
 980 }
 981
 982 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 983                            struct list_head *target_list)
 984 {
 985         if (strong) {
 986                 if (internal) {
 987                         if (target_list == NULL &&
 988                             node->internal_strong_refs == 0 &&
 989                             !(node->proc &&
 990                               node == node->proc->context->
 991                                       binder_context_mgr_node &&
 992                               node->has_strong_ref)) {
 993                                 pr_err("invalid inc strong node for %d\n",
 994                                         node->debug_id);
 995                                 return -EINVAL;
 996                         }
 997                         node->internal_strong_refs++;
 998                 } else
 999                         node->local_strong_refs++;
1000                 if (!node->has_strong_ref && target_list) {
1001                         list_del_init(&node->work.entry);
1002                         list_add_tail(&node->work.entry, target_list);
1003                 }
1004         } else {
1005                 if (!internal)
1006                         node->local_weak_refs++;
1007                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
1008                         if (target_list == NULL) {
1009                                 pr_err("invalid inc weak node for %d\n",
1010                                         node->debug_id);
1011                                 return -EINVAL;
1012                         }
1013                         list_add_tail(&node->work.entry, target_list);
1014                 }
1015         }
1016         return 0;
1017 }
1018
1019 static int binder_dec_node(struct binder_node *node, int strong, int internal)
1020 {
1021         if (strong) {
1022                 if (internal)
1023                         node->internal_strong_refs--;
1024                 else
1025                         node->local_strong_refs--;
1026                 if (node->local_strong_refs || node->internal_strong_refs)
1027                         return 0;
1028         } else {
1029                 if (!internal)
1030                         node->local_weak_refs--;
1031                 if (node->local_weak_refs || !hlist_empty(&node->refs))
1032                         return 0;
1033         }
1034         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
1035                 if (list_empty(&node->work.entry)) {
1036                         list_add_tail(&node->work.entry, &node->proc->todo);
1037                         wake_up_interruptible(&node->proc->wait);
1038                 }
1039         } else {
1040                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1041                     !node->local_weak_refs) {
1042                         list_del_init(&node->work.entry);
1043                         if (node->proc) {
1044                                 rb_erase(&node->rb_node, &node->proc->nodes);
1045                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1046                                              "refless node %d deleted\n",
1047                                              node->debug_id);
1048                         } else {
1049                                 hlist_del(&node->dead_node);
1050                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1051                                              "dead node %d deleted\n",
1052                                              node->debug_id);
1053                         }
1054                         kfree(node);
1055                         binder_stats_deleted(BINDER_STAT_NODE);
1056                 }
1057         }
1058
1059         return 0;
1060 }
1061
1062
1063 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1064                                          u32 desc, bool need_strong_ref)
1065 {
1066         struct rb_node *n = proc->refs_by_desc.rb_node;
1067         struct binder_ref *ref;
1068
1069         while (n) {
1070                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1071
1072                 if (desc < ref->desc) {
1073                         n = n->rb_left;
1074                 } else if (desc > ref->desc) {
1075                         n = n->rb_right;
1076                 } else if (need_strong_ref && !ref->strong) {
1077                         binder_user_error("tried to use weak ref as strong ref\n");
1078                         return NULL;
1079                 } else {
1080                         return ref;
1081                 }
1082         }
1083         return NULL;
1084 }
1085
1086 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1087                                                   struct binder_node *node)
1088 {
1089         struct rb_node *n;
1090         struct rb_node **p = &proc->refs_by_node.rb_node;
1091         struct rb_node *parent = NULL;
1092         struct binder_ref *ref, *new_ref;
1093         struct binder_context *context = proc->context;
1094
1095         while (*p) {
1096                 parent = *p;
1097                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1098
1099                 if (node < ref->node)
1100                         p = &(*p)->rb_left;
1101                 else if (node > ref->node)
1102                         p = &(*p)->rb_right;
1103                 else
1104                         return ref;
1105         }
1106         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1107         if (new_ref == NULL)
1108                 return NULL;
1109         binder_stats_created(BINDER_STAT_REF);
1110         new_ref->debug_id = atomic_inc_return(&binder_last_id);
1111         new_ref->proc = proc;
1112         new_ref->node = node;
1113         rb_link_node(&new_ref->rb_node_node, parent, p);
1114         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1115
1116         new_ref->desc = (node == context->binder_context_mgr_node) ? 0 : 1;
1117         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1118                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1119                 if (ref->desc > new_ref->desc)
1120                         break;
1121                 new_ref->desc = ref->desc + 1;
1122         }
1123
1124         p = &proc->refs_by_desc.rb_node;
1125         while (*p) {
1126                 parent = *p;
1127                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1128
1129                 if (new_ref->desc < ref->desc)
1130                         p = &(*p)->rb_left;
1131                 else if (new_ref->desc > ref->desc)
1132                         p = &(*p)->rb_right;
1133                 else
1134                         BUG();
1135         }
1136         rb_link_node(&new_ref->rb_node_desc, parent, p);
1137         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1138         if (node) {
1139                 hlist_add_head(&new_ref->node_entry, &node->refs);
1140
1141                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1142                              "%d new ref %d desc %d for node %d\n",
1143                               proc->pid, new_ref->debug_id, new_ref->desc,
1144                               node->debug_id);
1145         } else {
1146                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1147                              "%d new ref %d desc %d for dead node\n",
1148                               proc->pid, new_ref->debug_id, new_ref->desc);
1149         }
1150         return new_ref;
1151 }
1152
1153 static void binder_delete_ref(struct binder_ref *ref)
1154 {
1155         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1156                      "%d delete ref %d desc %d for node %d\n",
1157                       ref->proc->pid, ref->debug_id, ref->desc,
1158                       ref->node->debug_id);
1159
1160         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1161         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1162         if (ref->strong)
1163                 binder_dec_node(ref->node, 1, 1);
1164         hlist_del(&ref->node_entry);
1165         binder_dec_node(ref->node, 0, 1);
1166         if (ref->death) {
1167                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1168                              "%d delete ref %d desc %d has death notification\n",
1169                               ref->proc->pid, ref->debug_id, ref->desc);
1170                 list_del(&ref->death->work.entry);
1171                 kfree(ref->death);
1172                 binder_stats_deleted(BINDER_STAT_DEATH);
1173         }
1174         kfree(ref);
1175         binder_stats_deleted(BINDER_STAT_REF);
1176 }
1177
1178 static int binder_inc_ref(struct binder_ref *ref, int strong,
1179                           struct list_head *target_list)
1180 {
1181         int ret;
1182
1183         if (strong) {
1184                 if (ref->strong == 0) {
1185                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1186                         if (ret)
1187                                 return ret;
1188                 }
1189                 ref->strong++;
1190         } else {
1191                 if (ref->weak == 0) {
1192                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1193                         if (ret)
1194                                 return ret;
1195                 }
1196                 ref->weak++;
1197         }
1198         return 0;
1199 }
1200
1201
1202 static int binder_dec_ref(struct binder_ref *ref, int strong)
1203 {
1204         if (strong) {
1205                 if (ref->strong == 0) {
1206                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1207                                           ref->proc->pid, ref->debug_id,
1208                                           ref->desc, ref->strong, ref->weak);
1209                         return -EINVAL;
1210                 }
1211                 ref->strong--;
1212                 if (ref->strong == 0) {
1213                         int ret;
1214
1215                         ret = binder_dec_node(ref->node, strong, 1);
1216                         if (ret)
1217                                 return ret;
1218                 }
1219         } else {
1220                 if (ref->weak == 0) {
1221                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1222                                           ref->proc->pid, ref->debug_id,
1223                                           ref->desc, ref->strong, ref->weak);
1224                         return -EINVAL;
1225                 }
1226                 ref->weak--;
1227         }
1228         if (ref->strong == 0 && ref->weak == 0)
1229                 binder_delete_ref(ref);
1230         return 0;
1231 }
1232
1233 static void binder_pop_transaction(struct binder_thread *target_thread,
1234                                    struct binder_transaction *t)
1235 {
1236         if (target_thread) {
1237                 BUG_ON(target_thread->transaction_stack != t);
1238                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1239                 target_thread->transaction_stack =
1240                         target_thread->transaction_stack->from_parent;
1241                 t->from = NULL;
1242         }
1243         t->need_reply = 0;
1244         if (t->buffer)
1245                 t->buffer->transaction = NULL;
1246         kfree(t);
1247         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1248 }
1249
1250 static void binder_send_failed_reply(struct binder_transaction *t,
1251                                      uint32_t error_code)
1252 {
1253         struct binder_thread *target_thread;
1254         struct binder_transaction *next;
1255
1256         BUG_ON(t->flags & TF_ONE_WAY);
1257         while (1) {
1258                 target_thread = t->from;
1259                 if (target_thread) {
1260                         if (target_thread->return_error != BR_OK &&
1261                            target_thread->return_error2 == BR_OK) {
1262                                 target_thread->return_error2 =
1263                                         target_thread->return_error;
1264                                 target_thread->return_error = BR_OK;
1265                         }
1266                         if (target_thread->return_error == BR_OK) {
1267                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1268                                              "send failed reply for transaction %d to %d:%d\n",
1269                                               t->debug_id,
1270                                               target_thread->proc->pid,
1271                                               target_thread->pid);
1272
1273                                 binder_pop_transaction(target_thread, t);
1274                                 target_thread->return_error = error_code;
1275                                 wake_up_interruptible(&target_thread->wait);
1276                         } else {
1277                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1278                                         target_thread->proc->pid,
1279                                         target_thread->pid,
1280                                         target_thread->return_error);
1281                         }
1282                         return;
1283                 }
1284                 next = t->from_parent;
1285
1286                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1287                              "send failed reply for transaction %d, target dead\n",
1288                              t->debug_id);
1289
1290                 binder_pop_transaction(target_thread, t);
1291                 if (next == NULL) {
1292                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1293                                      "reply failed, no target thread at root\n");
1294                         return;
1295                 }
1296                 t = next;
1297                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1298                              "reply failed, no target thread -- retry %d\n",
1299                               t->debug_id);
1300         }
1301 }
1302
1303 /**
1304  * binder_validate_object() - checks for a valid metadata object in a buffer.
1305  * @buffer:     binder_buffer that we're parsing.
1306  * @offset:     offset in the buffer at which to validate an object.
1307  *
1308  * Return:      If there's a valid metadata object at @offset in @buffer, the
1309  *              size of that object. Otherwise, it returns zero.
1310  */
1311 static size_t binder_validate_object(struct binder_buffer *buffer, u64 offset)
1312 {
1313         /* Check if we can read a header first */
1314         struct binder_object_header *hdr;
1315         size_t object_size = 0;
1316
1317         if (offset > buffer->data_size - sizeof(*hdr) ||
1318             buffer->data_size < sizeof(*hdr) ||
1319             !IS_ALIGNED(offset, sizeof(u32)))
1320                 return 0;
1321
1322         /* Ok, now see if we can read a complete object. */
1323         hdr = (struct binder_object_header *)(buffer->data + offset);
1324         switch (hdr->type) {
1325         case BINDER_TYPE_BINDER:
1326         case BINDER_TYPE_WEAK_BINDER:
1327         case BINDER_TYPE_HANDLE:
1328         case BINDER_TYPE_WEAK_HANDLE:
1329                 object_size = sizeof(struct flat_binder_object);
1330                 break;
1331         case BINDER_TYPE_FD:
1332                 object_size = sizeof(struct binder_fd_object);
1333                 break;
1334         case BINDER_TYPE_PTR:
1335                 object_size = sizeof(struct binder_buffer_object);
1336                 break;
1337         case BINDER_TYPE_FDA:
1338                 object_size = sizeof(struct binder_fd_array_object);
1339                 break;
1340         default:
1341                 return 0;
1342         }
1343         if (offset <= buffer->data_size - object_size &&
1344             buffer->data_size >= object_size)
1345                 return object_size;
1346         else
1347                 return 0;
1348 }
1349
1350 /**
1351  * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer.
1352  * @b:          binder_buffer containing the object
1353  * @index:      index in offset array at which the binder_buffer_object is
1354  *              located
1355  * @start:      points to the start of the offset array
1356  * @num_valid:  the number of valid offsets in the offset array
1357  *
1358  * Return:      If @index is within the valid range of the offset array
1359  *              described by @start and @num_valid, and if there's a valid
1360  *              binder_buffer_object at the offset found in index @index
1361  *              of the offset array, that object is returned. Otherwise,
1362  *              %NULL is returned.
1363  *              Note that the offset found in index @index itself is not
1364  *              verified; this function assumes that @num_valid elements
1365  *              from @start were previously verified to have valid offsets.
1366  */
1367 static struct binder_buffer_object *binder_validate_ptr(struct binder_buffer *b,
1368                                                         binder_size_t index,
1369                                                         binder_size_t *start,
1370                                                         binder_size_t num_valid)
1371 {
1372         struct binder_buffer_object *buffer_obj;
1373         binder_size_t *offp;
1374
1375         if (index >= num_valid)
1376                 return NULL;
1377
1378         offp = start + index;
1379         buffer_obj = (struct binder_buffer_object *)(b->data + *offp);
1380         if (buffer_obj->hdr.type != BINDER_TYPE_PTR)
1381                 return NULL;
1382
1383         return buffer_obj;
1384 }
1385
1386 /**
1387  * binder_validate_fixup() - validates pointer/fd fixups happen in order.
1388  * @b:                  transaction buffer
1389  * @objects_start       start of objects buffer
1390  * @buffer:             binder_buffer_object in which to fix up
1391  * @offset:             start offset in @buffer to fix up
1392  * @last_obj:           last binder_buffer_object that we fixed up in
1393  * @last_min_offset:    minimum fixup offset in @last_obj
1394  *
1395  * Return:              %true if a fixup in buffer @buffer at offset @offset is
1396  *                      allowed.
1397  *
1398  * For safety reasons, we only allow fixups inside a buffer to happen
1399  * at increasing offsets; additionally, we only allow fixup on the last
1400  * buffer object that was verified, or one of its parents.
1401  *
1402  * Example of what is allowed:
1403  *
1404  * A
1405  *   B (parent = A, offset = 0)
1406  *   C (parent = A, offset = 16)
1407  *     D (parent = C, offset = 0)
1408  *   E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset)
1409  *
1410  * Examples of what is not allowed:
1411  *
1412  * Decreasing offsets within the same parent:
1413  * A
1414  *   C (parent = A, offset = 16)
1415  *   B (parent = A, offset = 0) // decreasing offset within A
1416  *
1417  * Referring to a parent that wasn't the last object or any of its parents:
1418  * A
1419  *   B (parent = A, offset = 0)
1420  *   C (parent = A, offset = 0)
1421  *   C (parent = A, offset = 16)
1422  *     D (parent = B, offset = 0) // B is not A or any of A's parents
1423  */
1424 static bool binder_validate_fixup(struct binder_buffer *b,
1425                                   binder_size_t *objects_start,
1426                                   struct binder_buffer_object *buffer,
1427                                   binder_size_t fixup_offset,
1428                                   struct binder_buffer_object *last_obj,
1429                                   binder_size_t last_min_offset)
1430 {
1431         if (!last_obj) {
1432                 /* Nothing to fix up in */
1433                 return false;
1434         }
1435
1436         while (last_obj != buffer) {
1437                 /*
1438                  * Safe to retrieve the parent of last_obj, since it
1439                  * was already previously verified by the driver.
1440                  */
1441                 if ((last_obj->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
1442                         return false;
1443                 last_min_offset = last_obj->parent_offset + sizeof(uintptr_t);
1444                 last_obj = (struct binder_buffer_object *)
1445                         (b->data + *(objects_start + last_obj->parent));
1446         }
1447         return (fixup_offset >= last_min_offset);
1448 }
1449
1450 static void binder_transaction_buffer_release(struct binder_proc *proc,
1451                                               struct binder_buffer *buffer,
1452                                               binder_size_t *failed_at)
1453 {
1454         binder_size_t *offp, *off_start, *off_end;
1455         int debug_id = buffer->debug_id;
1456
1457         binder_debug(BINDER_DEBUG_TRANSACTION,
1458                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1459                      proc->pid, buffer->debug_id,
1460                      buffer->data_size, buffer->offsets_size, failed_at);
1461
1462         if (buffer->target_node)
1463                 binder_dec_node(buffer->target_node, 1, 0);
1464
1465         off_start = (binder_size_t *)(buffer->data +
1466                                       ALIGN(buffer->data_size, sizeof(void *)));
1467         if (failed_at)
1468                 off_end = failed_at;
1469         else
1470                 off_end = (void *)off_start + buffer->offsets_size;
1471         for (offp = off_start; offp < off_end; offp++) {
1472                 struct binder_object_header *hdr;
1473                 size_t object_size = binder_validate_object(buffer, *offp);
1474
1475                 if (object_size == 0) {
1476                         pr_err("transaction release %d bad object at offset %lld, size %zd\n",
1477                                debug_id, (u64)*offp, buffer->data_size);
1478                         continue;
1479                 }
1480                 hdr = (struct binder_object_header *)(buffer->data + *offp);
1481                 switch (hdr->type) {
1482                 case BINDER_TYPE_BINDER:
1483                 case BINDER_TYPE_WEAK_BINDER: {
1484                         struct flat_binder_object *fp;
1485                         struct binder_node *node;
1486
1487                         fp = to_flat_binder_object(hdr);
1488                         node = binder_get_node(proc, fp->binder);
1489                         if (node == NULL) {
1490                                 pr_err("transaction release %d bad node %016llx\n",
1491                                        debug_id, (u64)fp->binder);
1492                                 break;
1493                         }
1494                         binder_debug(BINDER_DEBUG_TRANSACTION,
1495                                      "        node %d u%016llx\n",
1496                                      node->debug_id, (u64)node->ptr);
1497                         binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER,
1498                                         0);
1499                 } break;
1500                 case BINDER_TYPE_HANDLE:
1501                 case BINDER_TYPE_WEAK_HANDLE: {
1502                         struct flat_binder_object *fp;
1503                         struct binder_ref *ref;
1504
1505                         fp = to_flat_binder_object(hdr);
1506                         ref = binder_get_ref(proc, fp->handle,
1507                                              hdr->type == BINDER_TYPE_HANDLE);
1508                         if (ref == NULL) {
1509                                 pr_err("transaction release %d bad handle %d\n",
1510                                  debug_id, fp->handle);
1511                                 break;
1512                         }
1513                         binder_debug(BINDER_DEBUG_TRANSACTION,
1514                                      "        ref %d desc %d (node %d)\n",
1515                                      ref->debug_id, ref->desc, ref->node->debug_id);
1516                         binder_dec_ref(ref, hdr->type == BINDER_TYPE_HANDLE);
1517                 } break;
1518
1519                 case BINDER_TYPE_FD: {
1520                         struct binder_fd_object *fp = to_binder_fd_object(hdr);
1521
1522                         binder_debug(BINDER_DEBUG_TRANSACTION,
1523                                      "        fd %d\n", fp->fd);
1524                         if (failed_at)
1525                                 task_close_fd(proc, fp->fd);
1526                 } break;
1527                 case BINDER_TYPE_PTR:
1528                         /*
1529                          * Nothing to do here, this will get cleaned up when the
1530                          * transaction buffer gets freed
1531                          */
1532                         break;
1533                 case BINDER_TYPE_FDA: {
1534                         struct binder_fd_array_object *fda;
1535                         struct binder_buffer_object *parent;
1536                         uintptr_t parent_buffer;
1537                         u32 *fd_array;
1538                         size_t fd_index;
1539                         binder_size_t fd_buf_size;
1540
1541                         fda = to_binder_fd_array_object(hdr);
1542                         parent = binder_validate_ptr(buffer, fda->parent,
1543                                                      off_start,
1544                                                      offp - off_start);
1545                         if (!parent) {
1546                                 pr_err("transaction release %d bad parent offset",
1547                                        debug_id);
1548                                 continue;
1549                         }
1550                         /*
1551                          * Since the parent was already fixed up, convert it
1552                          * back to kernel address space to access it
1553                          */
1554                         parent_buffer = parent->buffer -
1555                                 proc->user_buffer_offset;
1556
1557                         fd_buf_size = sizeof(u32) * fda->num_fds;
1558                         if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
1559                                 pr_err("transaction release %d invalid number of fds (%lld)\n",
1560                                        debug_id, (u64)fda->num_fds);
1561                                 continue;
1562                         }
1563                         if (fd_buf_size > parent->length ||
1564                             fda->parent_offset > parent->length - fd_buf_size) {
1565                                 /* No space for all file descriptors here. */
1566                                 pr_err("transaction release %d not enough space for %lld fds in buffer\n",
1567                                        debug_id, (u64)fda->num_fds);
1568                                 continue;
1569                         }
1570                         fd_array = (u32 *)(parent_buffer + fda->parent_offset);
1571                         for (fd_index = 0; fd_index < fda->num_fds; fd_index++)
1572                                 task_close_fd(proc, fd_array[fd_index]);
1573                 } break;
1574                 default:
1575                         pr_err("transaction release %d bad object type %x\n",
1576                                 debug_id, hdr->type);
1577                         break;
1578                 }
1579         }
1580 }
1581
1582 static int binder_translate_binder(struct flat_binder_object *fp,
1583                                    struct binder_transaction *t,
1584                                    struct binder_thread *thread)
1585 {
1586         struct binder_node *node;
1587         struct binder_ref *ref;
1588         struct binder_proc *proc = thread->proc;
1589         struct binder_proc *target_proc = t->to_proc;
1590
1591         node = binder_get_node(proc, fp->binder);
1592         if (!node) {
1593                 node = binder_new_node(proc, fp->binder, fp->cookie);
1594                 if (!node)
1595                         return -ENOMEM;
1596
1597                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1598                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1599         }
1600         if (fp->cookie != node->cookie) {
1601                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1602                                   proc->pid, thread->pid, (u64)fp->binder,
1603                                   node->debug_id, (u64)fp->cookie,
1604                                   (u64)node->cookie);
1605                 return -EINVAL;
1606         }
1607         if (security_binder_transfer_binder(proc->tsk, target_proc->tsk))
1608                 return -EPERM;
1609
1610         ref = binder_get_ref_for_node(target_proc, node);
1611         if (!ref)
1612                 return -EINVAL;
1613
1614         if (fp->hdr.type == BINDER_TYPE_BINDER)
1615                 fp->hdr.type = BINDER_TYPE_HANDLE;
1616         else
1617                 fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
1618         fp->binder = 0;
1619         fp->handle = ref->desc;
1620         fp->cookie = 0;
1621         binder_inc_ref(ref, fp->hdr.type == BINDER_TYPE_HANDLE, &thread->todo);
1622
1623         trace_binder_transaction_node_to_ref(t, node, ref);
1624         binder_debug(BINDER_DEBUG_TRANSACTION,
1625                      "        node %d u%016llx -> ref %d desc %d\n",
1626                      node->debug_id, (u64)node->ptr,
1627                      ref->debug_id, ref->desc);
1628
1629         return 0;
1630 }
1631
1632 static int binder_translate_handle(struct flat_binder_object *fp,
1633                                    struct binder_transaction *t,
1634                                    struct binder_thread *thread)
1635 {
1636         struct binder_ref *ref;
1637         struct binder_proc *proc = thread->proc;
1638         struct binder_proc *target_proc = t->to_proc;
1639
1640         ref = binder_get_ref(proc, fp->handle,
1641                              fp->hdr.type == BINDER_TYPE_HANDLE);
1642         if (!ref) {
1643                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1644                                   proc->pid, thread->pid, fp->handle);
1645                 return -EINVAL;
1646         }
1647         if (security_binder_transfer_binder(proc->tsk, target_proc->tsk))
1648                 return -EPERM;
1649
1650         if (ref->node->proc == target_proc) {
1651                 if (fp->hdr.type == BINDER_TYPE_HANDLE)
1652                         fp->hdr.type = BINDER_TYPE_BINDER;
1653                 else
1654                         fp->hdr.type = BINDER_TYPE_WEAK_BINDER;
1655                 fp->binder = ref->node->ptr;
1656                 fp->cookie = ref->node->cookie;
1657                 binder_inc_node(ref->node, fp->hdr.type == BINDER_TYPE_BINDER,
1658                                 0, NULL);
1659                 trace_binder_transaction_ref_to_node(t, ref);
1660                 binder_debug(BINDER_DEBUG_TRANSACTION,
1661                              "        ref %d desc %d -> node %d u%016llx\n",
1662                              ref->debug_id, ref->desc, ref->node->debug_id,
1663                              (u64)ref->node->ptr);
1664         } else {
1665                 struct binder_ref *new_ref;
1666
1667                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1668                 if (!new_ref)
1669                         return -EINVAL;
1670
1671                 fp->binder = 0;
1672                 fp->handle = new_ref->desc;
1673                 fp->cookie = 0;
1674                 binder_inc_ref(new_ref, fp->hdr.type == BINDER_TYPE_HANDLE,
1675                                NULL);
1676                 trace_binder_transaction_ref_to_ref(t, ref, new_ref);
1677                 binder_debug(BINDER_DEBUG_TRANSACTION,
1678                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1679                              ref->debug_id, ref->desc, new_ref->debug_id,
1680                              new_ref->desc, ref->node->debug_id);
1681         }
1682         return 0;
1683 }
1684
1685 static int binder_translate_fd(int fd,
1686                                struct binder_transaction *t,
1687                                struct binder_thread *thread,
1688                                struct binder_transaction *in_reply_to)
1689 {
1690         struct binder_proc *proc = thread->proc;
1691         struct binder_proc *target_proc = t->to_proc;
1692         int target_fd;
1693         struct file *file;
1694         int ret;
1695         bool target_allows_fd;
1696
1697         if (in_reply_to)
1698                 target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS);
1699         else
1700                 target_allows_fd = t->buffer->target_node->accept_fds;
1701         if (!target_allows_fd) {
1702                 binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n",
1703                                   proc->pid, thread->pid,
1704                                   in_reply_to ? "reply" : "transaction",
1705                                   fd);
1706                 ret = -EPERM;
1707                 goto err_fd_not_accepted;
1708         }
1709
1710         file = fget(fd);
1711         if (!file) {
1712                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1713                                   proc->pid, thread->pid, fd);
1714                 ret = -EBADF;
1715                 goto err_fget;
1716         }
1717         ret = security_binder_transfer_file(proc->tsk, target_proc->tsk, file);
1718         if (ret < 0) {
1719                 ret = -EPERM;
1720                 goto err_security;
1721         }
1722
1723         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1724         if (target_fd < 0) {
1725                 ret = -ENOMEM;
1726                 goto err_get_unused_fd;
1727         }
1728         task_fd_install(target_proc, target_fd, file);
1729         trace_binder_transaction_fd(t, fd, target_fd);
1730         binder_debug(BINDER_DEBUG_TRANSACTION, "        fd %d -> %d\n",
1731                      fd, target_fd);
1732
1733         return target_fd;
1734
1735 err_get_unused_fd:
1736 err_security:
1737         fput(file);
1738 err_fget:
1739 err_fd_not_accepted:
1740         return ret;
1741 }
1742
1743 static int binder_translate_fd_array(struct binder_fd_array_object *fda,
1744                                      struct binder_buffer_object *parent,
1745                                      struct binder_transaction *t,
1746                                      struct binder_thread *thread,
1747                                      struct binder_transaction *in_reply_to)
1748 {
1749         binder_size_t fdi, fd_buf_size, num_installed_fds;
1750         int target_fd;
1751         uintptr_t parent_buffer;
1752         u32 *fd_array;
1753         struct binder_proc *proc = thread->proc;
1754         struct binder_proc *target_proc = t->to_proc;
1755
1756         fd_buf_size = sizeof(u32) * fda->num_fds;
1757         if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
1758                 binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n",
1759                                   proc->pid, thread->pid, (u64)fda->num_fds);
1760                 return -EINVAL;
1761         }
1762         if (fd_buf_size > parent->length ||
1763             fda->parent_offset > parent->length - fd_buf_size) {
1764                 /* No space for all file descriptors here. */
1765                 binder_user_error("%d:%d not enough space to store %lld fds in buffer\n",
1766                                   proc->pid, thread->pid, (u64)fda->num_fds);
1767                 return -EINVAL;
1768         }
1769         /*
1770          * Since the parent was already fixed up, convert it
1771          * back to the kernel address space to access it
1772          */
1773         parent_buffer = parent->buffer - target_proc->user_buffer_offset;
1774         fd_array = (u32 *)(parent_buffer + fda->parent_offset);
1775         if (!IS_ALIGNED((unsigned long)fd_array, sizeof(u32))) {
1776                 binder_user_error("%d:%d parent offset not aligned correctly.\n",
1777                                   proc->pid, thread->pid);
1778                 return -EINVAL;
1779         }
1780         for (fdi = 0; fdi < fda->num_fds; fdi++) {
1781                 target_fd = binder_translate_fd(fd_array[fdi], t, thread,
1782                                                 in_reply_to);
1783                 if (target_fd < 0)
1784                         goto err_translate_fd_failed;
1785                 fd_array[fdi] = target_fd;
1786         }
1787         return 0;
1788
1789 err_translate_fd_failed:
1790         /*
1791          * Failed to allocate fd or security error, free fds
1792          * installed so far.
1793          */
1794         num_installed_fds = fdi;
1795         for (fdi = 0; fdi < num_installed_fds; fdi++)
1796                 task_close_fd(target_proc, fd_array[fdi]);
1797         return target_fd;
1798 }
1799
1800 static int binder_fixup_parent(struct binder_transaction *t,
1801                                struct binder_thread *thread,
1802                                struct binder_buffer_object *bp,
1803                                binder_size_t *off_start,
1804                                binder_size_t num_valid,
1805                                struct binder_buffer_object *last_fixup_obj,
1806                                binder_size_t last_fixup_min_off)
1807 {
1808         struct binder_buffer_object *parent;
1809         u8 *parent_buffer;
1810         struct binder_buffer *b = t->buffer;
1811         struct binder_proc *proc = thread->proc;
1812         struct binder_proc *target_proc = t->to_proc;
1813
1814         if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
1815                 return 0;
1816
1817         parent = binder_validate_ptr(b, bp->parent, off_start, num_valid);
1818         if (!parent) {
1819                 binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
1820                                   proc->pid, thread->pid);
1821                 return -EINVAL;
1822         }
1823
1824         if (!binder_validate_fixup(b, off_start,
1825                                    parent, bp->parent_offset,
1826                                    last_fixup_obj,
1827                                    last_fixup_min_off)) {
1828                 binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
1829                                   proc->pid, thread->pid);
1830                 return -EINVAL;
1831         }
1832
1833         if (parent->length < sizeof(binder_uintptr_t) ||
1834             bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) {
1835                 /* No space for a pointer here! */
1836                 binder_user_error("%d:%d got transaction with invalid parent offset\n",
1837                                   proc->pid, thread->pid);
1838                 return -EINVAL;
1839         }
1840         parent_buffer = (u8 *)(parent->buffer -
1841                                target_proc->user_buffer_offset);
1842         *(binder_uintptr_t *)(parent_buffer + bp->parent_offset) = bp->buffer;
1843
1844         return 0;
1845 }
1846
1847 static void binder_transaction(struct binder_proc *proc,
1848                                struct binder_thread *thread,
1849                                struct binder_transaction_data *tr, int reply,
1850                                binder_size_t extra_buffers_size)
1851 {
1852         int ret;
1853         struct binder_transaction *t;
1854         struct binder_work *tcomplete;
1855         binder_size_t *offp, *off_end, *off_start;
1856         binder_size_t off_min;
1857         u8 *sg_bufp, *sg_buf_end;
1858         struct binder_proc *target_proc;
1859         struct binder_thread *target_thread = NULL;
1860         struct binder_node *target_node = NULL;
1861         struct list_head *target_list;
1862         wait_queue_head_t *target_wait;
1863         struct binder_transaction *in_reply_to = NULL;
1864         struct binder_transaction_log_entry *e;
1865         uint32_t return_error;
1866         struct binder_buffer_object *last_fixup_obj = NULL;
1867         binder_size_t last_fixup_min_off = 0;
1868         struct binder_context *context = proc->context;
1869
1870         e = binder_transaction_log_add(&context->transaction_log);
1871         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1872         e->from_proc = proc->pid;
1873         e->from_thread = thread->pid;
1874         e->target_handle = tr->target.handle;
1875         e->data_size = tr->data_size;
1876         e->offsets_size = tr->offsets_size;
1877         e->context_name = proc->context->name;
1878
1879         if (reply) {
1880                 in_reply_to = thread->transaction_stack;
1881                 if (in_reply_to == NULL) {
1882                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1883                                           proc->pid, thread->pid);
1884                         return_error = BR_FAILED_REPLY;
1885                         goto err_empty_call_stack;
1886                 }
1887                 binder_set_nice(in_reply_to->saved_priority);
1888                 if (in_reply_to->to_thread != thread) {
1889                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1890                                 proc->pid, thread->pid, in_reply_to->debug_id,
1891                                 in_reply_to->to_proc ?
1892                                 in_reply_to->to_proc->pid : 0,
1893                                 in_reply_to->to_thread ?
1894                                 in_reply_to->to_thread->pid : 0);
1895                         return_error = BR_FAILED_REPLY;
1896                         in_reply_to = NULL;
1897                         goto err_bad_call_stack;
1898                 }
1899                 thread->transaction_stack = in_reply_to->to_parent;
1900                 target_thread = in_reply_to->from;
1901                 if (target_thread == NULL) {
1902                         return_error = BR_DEAD_REPLY;
1903                         goto err_dead_binder;
1904                 }
1905                 if (target_thread->transaction_stack != in_reply_to) {
1906                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1907                                 proc->pid, thread->pid,
1908                                 target_thread->transaction_stack ?
1909                                 target_thread->transaction_stack->debug_id : 0,
1910                                 in_reply_to->debug_id);
1911                         return_error = BR_FAILED_REPLY;
1912                         in_reply_to = NULL;
1913                         target_thread = NULL;
1914                         goto err_dead_binder;
1915                 }
1916                 target_proc = target_thread->proc;
1917         } else {
1918                 if (tr->target.handle) {
1919                         struct binder_ref *ref;
1920
1921                         ref = binder_get_ref(proc, tr->target.handle, true);
1922                         if (ref == NULL) {
1923                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1924                                         proc->pid, thread->pid);
1925                                 return_error = BR_FAILED_REPLY;
1926                                 goto err_invalid_target_handle;
1927                         }
1928                         target_node = ref->node;
1929                 } else {
1930                         target_node = context->binder_context_mgr_node;
1931                         if (target_node == NULL) {
1932                                 return_error = BR_DEAD_REPLY;
1933                                 goto err_no_context_mgr_node;
1934                         }
1935                 }
1936                 e->to_node = target_node->debug_id;
1937                 target_proc = target_node->proc;
1938                 if (target_proc == NULL) {
1939                         return_error = BR_DEAD_REPLY;
1940                         goto err_dead_binder;
1941                 }
1942                 if (security_binder_transaction(proc->tsk,
1943                                                 target_proc->tsk) < 0) {
1944                         return_error = BR_FAILED_REPLY;
1945                         goto err_invalid_target_handle;
1946                 }
1947                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1948                         struct binder_transaction *tmp;
1949
1950                         tmp = thread->transaction_stack;
1951                         if (tmp->to_thread != thread) {
1952                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1953                                         proc->pid, thread->pid, tmp->debug_id,
1954                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1955                                         tmp->to_thread ?
1956                                         tmp->to_thread->pid : 0);
1957                                 return_error = BR_FAILED_REPLY;
1958                                 goto err_bad_call_stack;
1959                         }
1960                         while (tmp) {
1961                                 if (tmp->from && tmp->from->proc == target_proc)
1962                                         target_thread = tmp->from;
1963                                 tmp = tmp->from_parent;
1964                         }
1965                 }
1966         }
1967         if (target_thread) {
1968                 e->to_thread = target_thread->pid;
1969                 target_list = &target_thread->todo;
1970                 target_wait = &target_thread->wait;
1971         } else {
1972                 target_list = &target_proc->todo;
1973                 target_wait = &target_proc->wait;
1974         }
1975         e->to_proc = target_proc->pid;
1976
1977         /* TODO: reuse incoming transaction for reply */
1978         t = kzalloc(sizeof(*t), GFP_KERNEL);
1979         if (t == NULL) {
1980                 return_error = BR_FAILED_REPLY;
1981                 goto err_alloc_t_failed;
1982         }
1983         binder_stats_created(BINDER_STAT_TRANSACTION);
1984
1985         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1986         if (tcomplete == NULL) {
1987                 return_error = BR_FAILED_REPLY;
1988                 goto err_alloc_tcomplete_failed;
1989         }
1990         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1991
1992         t->debug_id = atomic_inc_return(&binder_last_id);
1993         e->debug_id = t->debug_id;
1994
1995         if (reply)
1996                 binder_debug(BINDER_DEBUG_TRANSACTION,
1997                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n",
1998                              proc->pid, thread->pid, t->debug_id,
1999                              target_proc->pid, target_thread->pid,
2000                              (u64)tr->data.ptr.buffer,
2001                              (u64)tr->data.ptr.offsets,
2002                              (u64)tr->data_size, (u64)tr->offsets_size,
2003                              (u64)extra_buffers_size);
2004         else
2005                 binder_debug(BINDER_DEBUG_TRANSACTION,
2006                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n",
2007                              proc->pid, thread->pid, t->debug_id,
2008                              target_proc->pid, target_node->debug_id,
2009                              (u64)tr->data.ptr.buffer,
2010                              (u64)tr->data.ptr.offsets,
2011                              (u64)tr->data_size, (u64)tr->offsets_size,
2012                              (u64)extra_buffers_size);
2013
2014         if (!reply && !(tr->flags & TF_ONE_WAY))
2015                 t->from = thread;
2016         else
2017                 t->from = NULL;
2018         t->sender_euid = task_euid(proc->tsk);
2019         t->to_proc = target_proc;
2020         t->to_thread = target_thread;
2021         t->code = tr->code;
2022         t->flags = tr->flags;
2023         t->priority = task_nice(current);
2024
2025         trace_binder_transaction(reply, t, target_node);
2026
2027         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
2028                 tr->offsets_size, extra_buffers_size,
2029                 !reply && (t->flags & TF_ONE_WAY));
2030         if (t->buffer == NULL) {
2031                 return_error = BR_FAILED_REPLY;
2032                 goto err_binder_alloc_buf_failed;
2033         }
2034         t->buffer->allow_user_free = 0;
2035         t->buffer->debug_id = t->debug_id;
2036         t->buffer->transaction = t;
2037         t->buffer->target_node = target_node;
2038         trace_binder_transaction_alloc_buf(t->buffer);
2039         if (target_node)
2040                 binder_inc_node(target_node, 1, 0, NULL);
2041
2042         off_start = (binder_size_t *)(t->buffer->data +
2043                                       ALIGN(tr->data_size, sizeof(void *)));
2044         offp = off_start;
2045
2046         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
2047                            tr->data.ptr.buffer, tr->data_size)) {
2048                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
2049                                 proc->pid, thread->pid);
2050                 return_error = BR_FAILED_REPLY;
2051                 goto err_copy_data_failed;
2052         }
2053         if (copy_from_user(offp, (const void __user *)(uintptr_t)
2054                            tr->data.ptr.offsets, tr->offsets_size)) {
2055                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2056                                 proc->pid, thread->pid);
2057                 return_error = BR_FAILED_REPLY;
2058                 goto err_copy_data_failed;
2059         }
2060         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
2061                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
2062                                 proc->pid, thread->pid, (u64)tr->offsets_size);
2063                 return_error = BR_FAILED_REPLY;
2064                 goto err_bad_offset;
2065         }
2066         if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) {
2067                 binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n",
2068                                   proc->pid, thread->pid,
2069                                   (u64)extra_buffers_size);
2070                 return_error = BR_FAILED_REPLY;
2071                 goto err_bad_offset;
2072         }
2073         off_end = (void *)off_start + tr->offsets_size;
2074         sg_bufp = (u8 *)(PTR_ALIGN(off_end, sizeof(void *)));
2075         sg_buf_end = sg_bufp + extra_buffers_size;
2076         off_min = 0;
2077         for (; offp < off_end; offp++) {
2078                 struct binder_object_header *hdr;
2079                 size_t object_size = binder_validate_object(t->buffer, *offp);
2080
2081                 if (object_size == 0 || *offp < off_min) {
2082                         binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n",
2083                                           proc->pid, thread->pid, (u64)*offp,
2084                                           (u64)off_min,
2085                                           (u64)t->buffer->data_size);
2086                         return_error = BR_FAILED_REPLY;
2087                         goto err_bad_offset;
2088                 }
2089
2090                 hdr = (struct binder_object_header *)(t->buffer->data + *offp);
2091                 off_min = *offp + object_size;
2092                 switch (hdr->type) {
2093                 case BINDER_TYPE_BINDER:
2094                 case BINDER_TYPE_WEAK_BINDER: {
2095                         struct flat_binder_object *fp;
2096
2097                         fp = to_flat_binder_object(hdr);
2098                         ret = binder_translate_binder(fp, t, thread);
2099                         if (ret < 0) {
2100                                 return_error = BR_FAILED_REPLY;
2101                                 goto err_translate_failed;
2102                         }
2103                 } break;
2104                 case BINDER_TYPE_HANDLE:
2105                 case BINDER_TYPE_WEAK_HANDLE: {
2106                         struct flat_binder_object *fp;
2107
2108                         fp = to_flat_binder_object(hdr);
2109                         ret = binder_translate_handle(fp, t, thread);
2110                         if (ret < 0) {
2111                                 return_error = BR_FAILED_REPLY;
2112                                 goto err_translate_failed;
2113                         }
2114                 } break;
2115
2116                 case BINDER_TYPE_FD: {
2117                         struct binder_fd_object *fp = to_binder_fd_object(hdr);
2118                         int target_fd = binder_translate_fd(fp->fd, t, thread,
2119                                                             in_reply_to);
2120
2121                         if (target_fd < 0) {
2122                                 return_error = BR_FAILED_REPLY;
2123                                 goto err_translate_failed;
2124                         }
2125                         fp->pad_binder = 0;
2126                         fp->fd = target_fd;
2127                 } break;
2128                 case BINDER_TYPE_FDA: {
2129                         struct binder_fd_array_object *fda =
2130                                 to_binder_fd_array_object(hdr);
2131                         struct binder_buffer_object *parent =
2132                                 binder_validate_ptr(t->buffer, fda->parent,
2133                                                     off_start,
2134                                                     offp - off_start);
2135                         if (!parent) {
2136                                 binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
2137                                                   proc->pid, thread->pid);
2138                                 return_error = BR_FAILED_REPLY;
2139                                 goto err_bad_parent;
2140                         }
2141                         if (!binder_validate_fixup(t->buffer, off_start,
2142                                                    parent, fda->parent_offset,
2143                                                    last_fixup_obj,
2144                                                    last_fixup_min_off)) {
2145                                 binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
2146                                                   proc->pid, thread->pid);
2147                                 return_error = BR_FAILED_REPLY;
2148                                 goto err_bad_parent;
2149                         }
2150                         ret = binder_translate_fd_array(fda, parent, t, thread,
2151                                                         in_reply_to);
2152                         if (ret < 0) {
2153                                 return_error = BR_FAILED_REPLY;
2154                                 goto err_translate_failed;
2155                         }
2156                         last_fixup_obj = parent;
2157                         last_fixup_min_off =
2158                                 fda->parent_offset + sizeof(u32) * fda->num_fds;
2159                 } break;
2160                 case BINDER_TYPE_PTR: {
2161                         struct binder_buffer_object *bp =
2162                                 to_binder_buffer_object(hdr);
2163                         size_t buf_left = sg_buf_end - sg_bufp;
2164
2165                         if (bp->length > buf_left) {
2166                                 binder_user_error("%d:%d got transaction with too large buffer\n",
2167                                                   proc->pid, thread->pid);
2168                                 return_error = BR_FAILED_REPLY;
2169                                 goto err_bad_offset;
2170                         }
2171                         if (copy_from_user(sg_bufp,
2172                                            (const void __user *)(uintptr_t)
2173                                            bp->buffer, bp->length)) {
2174                                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2175                                                   proc->pid, thread->pid);
2176                                 return_error = BR_FAILED_REPLY;
2177                                 goto err_copy_data_failed;
2178                         }
2179                         /* Fixup buffer pointer to target proc address space */
2180                         bp->buffer = (uintptr_t)sg_bufp +
2181                                 target_proc->user_buffer_offset;
2182                         sg_bufp += ALIGN(bp->length, sizeof(u64));
2183
2184                         ret = binder_fixup_parent(t, thread, bp, off_start,
2185                                                   offp - off_start,
2186                                                   last_fixup_obj,
2187                                                   last_fixup_min_off);
2188                         if (ret < 0) {
2189                                 return_error = BR_FAILED_REPLY;
2190                                 goto err_translate_failed;
2191                         }
2192                         last_fixup_obj = bp;
2193                         last_fixup_min_off = 0;
2194                 } break;
2195                 default:
2196                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
2197                                 proc->pid, thread->pid, hdr->type);
2198                         return_error = BR_FAILED_REPLY;
2199                         goto err_bad_object_type;
2200                 }
2201         }
2202         if (reply) {
2203                 BUG_ON(t->buffer->async_transaction != 0);
2204                 binder_pop_transaction(target_thread, in_reply_to);
2205         } else if (!(t->flags & TF_ONE_WAY)) {
2206                 BUG_ON(t->buffer->async_transaction != 0);
2207                 t->need_reply = 1;
2208                 t->from_parent = thread->transaction_stack;
2209                 thread->transaction_stack = t;
2210         } else {
2211                 BUG_ON(target_node == NULL);
2212                 BUG_ON(t->buffer->async_transaction != 1);
2213                 if (target_node->has_async_transaction) {
2214                         target_list = &target_node->async_todo;
2215                         target_wait = NULL;
2216                 } else
2217                         target_node->has_async_transaction = 1;
2218         }
2219         t->work.type = BINDER_WORK_TRANSACTION;
2220         list_add_tail(&t->work.entry, target_list);
2221         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
2222         list_add_tail(&tcomplete->entry, &thread->todo);
2223         if (target_wait)
2224                 wake_up_interruptible(target_wait);
2225         return;
2226
2227 err_translate_failed:
2228 err_bad_object_type:
2229 err_bad_offset:
2230 err_bad_parent:
2231 err_copy_data_failed:
2232         trace_binder_transaction_failed_buffer_release(t->buffer);
2233         binder_transaction_buffer_release(target_proc, t->buffer, offp);
2234         t->buffer->transaction = NULL;
2235         binder_free_buf(target_proc, t->buffer);
2236 err_binder_alloc_buf_failed:
2237         kfree(tcomplete);
2238         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2239 err_alloc_tcomplete_failed:
2240         kfree(t);
2241         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2242 err_alloc_t_failed:
2243 err_bad_call_stack:
2244 err_empty_call_stack:
2245 err_dead_binder:
2246 err_invalid_target_handle:
2247 err_no_context_mgr_node:
2248         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2249                      "%d:%d transaction failed %d, size %lld-%lld\n",
2250                      proc->pid, thread->pid, return_error,
2251                      (u64)tr->data_size, (u64)tr->offsets_size);
2252
2253         {
2254                 struct binder_transaction_log_entry *fe;
2255
2256                 fe = binder_transaction_log_add(
2257                                 &context->transaction_log_failed);
2258                 *fe = *e;
2259         }
2260
2261         BUG_ON(thread->return_error != BR_OK);
2262         if (in_reply_to) {
2263                 thread->return_error = BR_TRANSACTION_COMPLETE;
2264                 binder_send_failed_reply(in_reply_to, return_error);
2265         } else
2266                 thread->return_error = return_error;
2267 }
2268
2269 static int binder_thread_write(struct binder_proc *proc,
2270                         struct binder_thread *thread,
2271                         binder_uintptr_t binder_buffer, size_t size,
2272                         binder_size_t *consumed)
2273 {
2274         uint32_t cmd;
2275         struct binder_context *context = proc->context;
2276         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2277         void __user *ptr = buffer + *consumed;
2278         void __user *end = buffer + size;
2279
2280         while (ptr < end && thread->return_error == BR_OK) {
2281                 if (get_user(cmd, (uint32_t __user *)ptr))
2282                         return -EFAULT;
2283                 ptr += sizeof(uint32_t);
2284                 trace_binder_command(cmd);
2285                 if (_IOC_NR(cmd) < ARRAY_SIZE(context->binder_stats.bc)) {
2286                         context->binder_stats.bc[_IOC_NR(cmd)]++;
2287                         proc->stats.bc[_IOC_NR(cmd)]++;
2288                         thread->stats.bc[_IOC_NR(cmd)]++;
2289                 }
2290                 switch (cmd) {
2291                 case BC_INCREFS:
2292                 case BC_ACQUIRE:
2293                 case BC_RELEASE:
2294                 case BC_DECREFS: {
2295                         uint32_t target;
2296                         struct binder_ref *ref;
2297                         const char *debug_string;
2298
2299                         if (get_user(target, (uint32_t __user *)ptr))
2300                                 return -EFAULT;
2301                         ptr += sizeof(uint32_t);
2302                         if (target == 0 && context->binder_context_mgr_node &&
2303                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
2304                                 ref = binder_get_ref_for_node(proc,
2305                                         context->binder_context_mgr_node);
2306                                 if (ref->desc != target) {
2307                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
2308                                                 proc->pid, thread->pid,
2309                                                 ref->desc);
2310                                 }
2311                         } else
2312                                 ref = binder_get_ref(proc, target,
2313                                                      cmd == BC_ACQUIRE ||
2314                                                      cmd == BC_RELEASE);
2315                         if (ref == NULL) {
2316                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
2317                                         proc->pid, thread->pid, target);
2318                                 break;
2319                         }
2320                         switch (cmd) {
2321                         case BC_INCREFS:
2322                                 debug_string = "IncRefs";
2323                                 binder_inc_ref(ref, 0, NULL);
2324                                 break;
2325                         case BC_ACQUIRE:
2326                                 debug_string = "Acquire";
2327                                 binder_inc_ref(ref, 1, NULL);
2328                                 break;
2329                         case BC_RELEASE:
2330                                 debug_string = "Release";
2331                                 binder_dec_ref(ref, 1);
2332                                 break;
2333                         case BC_DECREFS:
2334                         default:
2335                                 debug_string = "DecRefs";
2336                                 binder_dec_ref(ref, 0);
2337                                 break;
2338                         }
2339                         binder_debug(BINDER_DEBUG_USER_REFS,
2340                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
2341                                      proc->pid, thread->pid, debug_string, ref->debug_id,
2342                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
2343                         break;
2344                 }
2345                 case BC_INCREFS_DONE:
2346                 case BC_ACQUIRE_DONE: {
2347                         binder_uintptr_t node_ptr;
2348                         binder_uintptr_t cookie;
2349                         struct binder_node *node;
2350
2351                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
2352                                 return -EFAULT;
2353                         ptr += sizeof(binder_uintptr_t);
2354                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2355                                 return -EFAULT;
2356                         ptr += sizeof(binder_uintptr_t);
2357                         node = binder_get_node(proc, node_ptr);
2358                         if (node == NULL) {
2359                                 binder_user_error("%d:%d %s u%016llx no match\n",
2360                                         proc->pid, thread->pid,
2361                                         cmd == BC_INCREFS_DONE ?
2362                                         "BC_INCREFS_DONE" :
2363                                         "BC_ACQUIRE_DONE",
2364                                         (u64)node_ptr);
2365                                 break;
2366                         }
2367                         if (cookie != node->cookie) {
2368                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
2369                                         proc->pid, thread->pid,
2370                                         cmd == BC_INCREFS_DONE ?
2371                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
2372                                         (u64)node_ptr, node->debug_id,
2373                                         (u64)cookie, (u64)node->cookie);
2374                                 break;
2375                         }
2376                         if (cmd == BC_ACQUIRE_DONE) {
2377                                 if (node->pending_strong_ref == 0) {
2378                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
2379                                                 proc->pid, thread->pid,
2380                                                 node->debug_id);
2381                                         break;
2382                                 }
2383                                 node->pending_strong_ref = 0;
2384                         } else {
2385                                 if (node->pending_weak_ref == 0) {
2386                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
2387                                                 proc->pid, thread->pid,
2388                                                 node->debug_id);
2389                                         break;
2390                                 }
2391                                 node->pending_weak_ref = 0;
2392                         }
2393                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
2394                         binder_debug(BINDER_DEBUG_USER_REFS,
2395                                      "%d:%d %s node %d ls %d lw %d\n",
2396                                      proc->pid, thread->pid,
2397                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
2398                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
2399                         break;
2400                 }
2401                 case BC_ATTEMPT_ACQUIRE:
2402                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
2403                         return -EINVAL;
2404                 case BC_ACQUIRE_RESULT:
2405                         pr_err("BC_ACQUIRE_RESULT not supported\n");
2406                         return -EINVAL;
2407
2408                 case BC_FREE_BUFFER: {
2409                         binder_uintptr_t data_ptr;
2410                         struct binder_buffer *buffer;
2411
2412                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
2413                                 return -EFAULT;
2414                         ptr += sizeof(binder_uintptr_t);
2415
2416                         buffer = binder_buffer_lookup(proc, data_ptr);
2417                         if (buffer == NULL) {
2418                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
2419                                         proc->pid, thread->pid, (u64)data_ptr);
2420                                 break;
2421                         }
2422                         if (!buffer->allow_user_free) {
2423                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
2424                                         proc->pid, thread->pid, (u64)data_ptr);
2425                                 break;
2426                         }
2427                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
2428                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
2429                                      proc->pid, thread->pid, (u64)data_ptr,
2430                                      buffer->debug_id,
2431                                      buffer->transaction ? "active" : "finished");
2432
2433                         if (buffer->transaction) {
2434                                 buffer->transaction->buffer = NULL;
2435                                 buffer->transaction = NULL;
2436                         }
2437                         if (buffer->async_transaction && buffer->target_node) {
2438                                 BUG_ON(!buffer->target_node->has_async_transaction);
2439                                 if (list_empty(&buffer->target_node->async_todo))
2440                                         buffer->target_node->has_async_transaction = 0;
2441                                 else
2442                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
2443                         }
2444                         trace_binder_transaction_buffer_release(buffer);
2445                         binder_transaction_buffer_release(proc, buffer, NULL);
2446                         binder_free_buf(proc, buffer);
2447                         break;
2448                 }
2449
2450                 case BC_TRANSACTION_SG:
2451                 case BC_REPLY_SG: {
2452                         struct binder_transaction_data_sg tr;
2453
2454                         if (copy_from_user(&tr, ptr, sizeof(tr)))
2455                                 return -EFAULT;
2456                         ptr += sizeof(tr);
2457                         binder_transaction(proc, thread, &tr.transaction_data,
2458                                            cmd == BC_REPLY_SG, tr.buffers_size);
2459                         break;
2460                 }
2461                 case BC_TRANSACTION:
2462                 case BC_REPLY: {
2463                         struct binder_transaction_data tr;
2464
2465                         if (copy_from_user(&tr, ptr, sizeof(tr)))
2466                                 return -EFAULT;
2467                         ptr += sizeof(tr);
2468                         binder_transaction(proc, thread, &tr,
2469                                            cmd == BC_REPLY, 0);
2470                         break;
2471                 }
2472
2473                 case BC_REGISTER_LOOPER:
2474                         binder_debug(BINDER_DEBUG_THREADS,
2475                                      "%d:%d BC_REGISTER_LOOPER\n",
2476                                      proc->pid, thread->pid);
2477                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
2478                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2479                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
2480                                         proc->pid, thread->pid);
2481                         } else if (proc->requested_threads == 0) {
2482                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2483                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
2484                                         proc->pid, thread->pid);
2485                         } else {
2486                                 proc->requested_threads--;
2487                                 proc->requested_threads_started++;
2488                         }
2489                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
2490                         break;
2491                 case BC_ENTER_LOOPER:
2492                         binder_debug(BINDER_DEBUG_THREADS,
2493                                      "%d:%d BC_ENTER_LOOPER\n",
2494                                      proc->pid, thread->pid);
2495                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
2496                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2497                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
2498                                         proc->pid, thread->pid);
2499                         }
2500                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
2501                         break;
2502                 case BC_EXIT_LOOPER:
2503                         binder_debug(BINDER_DEBUG_THREADS,
2504                                      "%d:%d BC_EXIT_LOOPER\n",
2505                                      proc->pid, thread->pid);
2506                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
2507                         break;
2508
2509                 case BC_REQUEST_DEATH_NOTIFICATION:
2510                 case BC_CLEAR_DEATH_NOTIFICATION: {
2511                         uint32_t target;
2512                         binder_uintptr_t cookie;
2513                         struct binder_ref *ref;
2514                         struct binder_ref_death *death;
2515
2516                         if (get_user(target, (uint32_t __user *)ptr))
2517                                 return -EFAULT;
2518                         ptr += sizeof(uint32_t);
2519                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2520                                 return -EFAULT;
2521                         ptr += sizeof(binder_uintptr_t);
2522                         ref = binder_get_ref(proc, target, false);
2523                         if (ref == NULL) {
2524                                 binder_user_error("%d:%d %s invalid ref %d\n",
2525                                         proc->pid, thread->pid,
2526                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2527                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2528                                         "BC_CLEAR_DEATH_NOTIFICATION",
2529                                         target);
2530                                 break;
2531                         }
2532
2533                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2534                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2535                                      proc->pid, thread->pid,
2536                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2537                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2538                                      "BC_CLEAR_DEATH_NOTIFICATION",
2539                                      (u64)cookie, ref->debug_id, ref->desc,
2540                                      ref->strong, ref->weak, ref->node->debug_id);
2541
2542                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2543                                 if (ref->death) {
2544                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2545                                                 proc->pid, thread->pid);
2546                                         break;
2547                                 }
2548                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2549                                 if (death == NULL) {
2550                                         thread->return_error = BR_ERROR;
2551                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2552                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2553                                                      proc->pid, thread->pid);
2554                                         break;
2555                                 }
2556                                 binder_stats_created(BINDER_STAT_DEATH);
2557                                 INIT_LIST_HEAD(&death->work.entry);
2558                                 death->cookie = cookie;
2559                                 ref->death = death;
2560                                 if (ref->node->proc == NULL) {
2561                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2562                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2563                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2564                                         } else {
2565                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2566                                                 wake_up_interruptible(&proc->wait);
2567                                         }
2568                                 }
2569                         } else {
2570                                 if (ref->death == NULL) {
2571                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2572                                                 proc->pid, thread->pid);
2573                                         break;
2574                                 }
2575                                 death = ref->death;
2576                                 if (death->cookie != cookie) {
2577                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2578                                                 proc->pid, thread->pid,
2579                                                 (u64)death->cookie,
2580                                                 (u64)cookie);
2581                                         break;
2582                                 }
2583                                 ref->death = NULL;
2584                                 if (list_empty(&death->work.entry)) {
2585                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2586                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2587                                                 list_add_tail(&death->work.entry, &thread->todo);
2588                                         } else {
2589                                                 list_add_tail(&death->work.entry, &proc->todo);
2590                                                 wake_up_interruptible(&proc->wait);
2591                                         }
2592                                 } else {
2593                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2594                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2595                                 }
2596                         }
2597                 } break;
2598                 case BC_DEAD_BINDER_DONE: {
2599                         struct binder_work *w;
2600                         binder_uintptr_t cookie;
2601                         struct binder_ref_death *death = NULL;
2602
2603                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2604                                 return -EFAULT;
2605
2606                         ptr += sizeof(cookie);
2607                         list_for_each_entry(w, &proc->delivered_death, entry) {
2608                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2609
2610                                 if (tmp_death->cookie == cookie) {
2611                                         death = tmp_death;
2612                                         break;
2613                                 }
2614                         }
2615                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2616                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2617                                      proc->pid, thread->pid, (u64)cookie,
2618                                      death);
2619                         if (death == NULL) {
2620                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2621                                         proc->pid, thread->pid, (u64)cookie);
2622                                 break;
2623                         }
2624
2625                         list_del_init(&death->work.entry);
2626                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2627                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2628                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2629                                         list_add_tail(&death->work.entry, &thread->todo);
2630                                 } else {
2631                                         list_add_tail(&death->work.entry, &proc->todo);
2632                                         wake_up_interruptible(&proc->wait);
2633                                 }
2634                         }
2635                 } break;
2636
2637                 default:
2638                         pr_err("%d:%d unknown command %d\n",
2639                                proc->pid, thread->pid, cmd);
2640                         return -EINVAL;
2641                 }
2642                 *consumed = ptr - buffer;
2643         }
2644         return 0;
2645 }
2646
2647 static void binder_stat_br(struct binder_proc *proc,
2648                            struct binder_thread *thread, uint32_t cmd)
2649 {
2650         trace_binder_return(cmd);
2651         if (_IOC_NR(cmd) < ARRAY_SIZE(proc->stats.br)) {
2652                 proc->context->binder_stats.br[_IOC_NR(cmd)]++;
2653                 proc->stats.br[_IOC_NR(cmd)]++;
2654                 thread->stats.br[_IOC_NR(cmd)]++;
2655         }
2656 }
2657
2658 static int binder_has_proc_work(struct binder_proc *proc,
2659                                 struct binder_thread *thread)
2660 {
2661         return !list_empty(&proc->todo) ||
2662                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2663 }
2664
2665 static int binder_has_thread_work(struct binder_thread *thread)
2666 {
2667         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2668                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2669 }
2670
2671 static int binder_thread_read(struct binder_proc *proc,
2672                               struct binder_thread *thread,
2673                               binder_uintptr_t binder_buffer, size_t size,
2674                               binder_size_t *consumed, int non_block)
2675 {
2676         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2677         void __user *ptr = buffer + *consumed;
2678         void __user *end = buffer + size;
2679
2680         int ret = 0;
2681         int wait_for_proc_work;
2682
2683         if (*consumed == 0) {
2684                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2685                         return -EFAULT;
2686                 ptr += sizeof(uint32_t);
2687         }
2688
2689 retry:
2690         wait_for_proc_work = thread->transaction_stack == NULL &&
2691                                 list_empty(&thread->todo);
2692
2693         if (thread->return_error != BR_OK && ptr < end) {
2694                 if (thread->return_error2 != BR_OK) {
2695                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2696                                 return -EFAULT;
2697                         ptr += sizeof(uint32_t);
2698                         binder_stat_br(proc, thread, thread->return_error2);
2699                         if (ptr == end)
2700                                 goto done;
2701                         thread->return_error2 = BR_OK;
2702                 }
2703                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2704                         return -EFAULT;
2705                 ptr += sizeof(uint32_t);
2706                 binder_stat_br(proc, thread, thread->return_error);
2707                 thread->return_error = BR_OK;
2708                 goto done;
2709         }
2710
2711
2712         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2713         if (wait_for_proc_work)
2714                 proc->ready_threads++;
2715
2716         binder_unlock(proc->context, __func__);
2717
2718         trace_binder_wait_for_work(wait_for_proc_work,
2719                                    !!thread->transaction_stack,
2720                                    !list_empty(&thread->todo));
2721         if (wait_for_proc_work) {
2722                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2723                                         BINDER_LOOPER_STATE_ENTERED))) {
2724                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2725                                 proc->pid, thread->pid, thread->looper);
2726                         wait_event_interruptible(binder_user_error_wait,
2727                                                  binder_stop_on_user_error < 2);
2728                 }
2729                 binder_set_nice(proc->default_priority);
2730                 if (non_block) {
2731                         if (!binder_has_proc_work(proc, thread))
2732                                 ret = -EAGAIN;
2733                 } else
2734                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2735         } else {
2736                 if (non_block) {
2737                         if (!binder_has_thread_work(thread))
2738                                 ret = -EAGAIN;
2739                 } else
2740                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2741         }
2742
2743         binder_lock(proc->context, __func__);
2744
2745         if (wait_for_proc_work)
2746                 proc->ready_threads--;
2747         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2748
2749         if (ret)
2750                 return ret;
2751
2752         while (1) {
2753                 uint32_t cmd;
2754                 struct binder_transaction_data tr;
2755                 struct binder_work *w;
2756                 struct binder_transaction *t = NULL;
2757
2758                 if (!list_empty(&thread->todo)) {
2759                         w = list_first_entry(&thread->todo, struct binder_work,
2760                                              entry);
2761                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2762                         w = list_first_entry(&proc->todo, struct binder_work,
2763                                              entry);
2764                 } else {
2765                         /* no data added */
2766                         if (ptr - buffer == 4 &&
2767                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2768                                 goto retry;
2769                         break;
2770                 }
2771
2772                 if (end - ptr < sizeof(tr) + 4)
2773                         break;
2774
2775                 switch (w->type) {
2776                 case BINDER_WORK_TRANSACTION: {
2777                         t = container_of(w, struct binder_transaction, work);
2778                 } break;
2779                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2780                         cmd = BR_TRANSACTION_COMPLETE;
2781                         if (put_user(cmd, (uint32_t __user *)ptr))
2782                                 return -EFAULT;
2783                         ptr += sizeof(uint32_t);
2784
2785                         binder_stat_br(proc, thread, cmd);
2786                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2787                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2788                                      proc->pid, thread->pid);
2789
2790                         list_del(&w->entry);
2791                         kfree(w);
2792                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2793                 } break;
2794                 case BINDER_WORK_NODE: {
2795                         struct binder_node *node = container_of(w, struct binder_node, work);
2796                         uint32_t cmd = BR_NOOP;
2797                         const char *cmd_name;
2798                         int strong = node->internal_strong_refs || node->local_strong_refs;
2799                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2800
2801                         if (weak && !node->has_weak_ref) {
2802                                 cmd = BR_INCREFS;
2803                                 cmd_name = "BR_INCREFS";
2804                                 node->has_weak_ref = 1;
2805                                 node->pending_weak_ref = 1;
2806                                 node->local_weak_refs++;
2807                         } else if (strong && !node->has_strong_ref) {
2808                                 cmd = BR_ACQUIRE;
2809                                 cmd_name = "BR_ACQUIRE";
2810                                 node->has_strong_ref = 1;
2811                                 node->pending_strong_ref = 1;
2812                                 node->local_strong_refs++;
2813                         } else if (!strong && node->has_strong_ref) {
2814                                 cmd = BR_RELEASE;
2815                                 cmd_name = "BR_RELEASE";
2816                                 node->has_strong_ref = 0;
2817                         } else if (!weak && node->has_weak_ref) {
2818                                 cmd = BR_DECREFS;
2819                                 cmd_name = "BR_DECREFS";
2820                                 node->has_weak_ref = 0;
2821                         }
2822                         if (cmd != BR_NOOP) {
2823                                 if (put_user(cmd, (uint32_t __user *)ptr))
2824                                         return -EFAULT;
2825                                 ptr += sizeof(uint32_t);
2826                                 if (put_user(node->ptr,
2827                                              (binder_uintptr_t __user *)ptr))
2828                                         return -EFAULT;
2829                                 ptr += sizeof(binder_uintptr_t);
2830                                 if (put_user(node->cookie,
2831                                              (binder_uintptr_t __user *)ptr))
2832                                         return -EFAULT;
2833                                 ptr += sizeof(binder_uintptr_t);
2834
2835                                 binder_stat_br(proc, thread, cmd);
2836                                 binder_debug(BINDER_DEBUG_USER_REFS,
2837                                              "%d:%d %s %d u%016llx c%016llx\n",
2838                                              proc->pid, thread->pid, cmd_name,
2839                                              node->debug_id,
2840                                              (u64)node->ptr, (u64)node->cookie);
2841                         } else {
2842                                 list_del_init(&w->entry);
2843                                 if (!weak && !strong) {
2844                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2845                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2846                                                      proc->pid, thread->pid,
2847                                                      node->debug_id,
2848                                                      (u64)node->ptr,
2849                                                      (u64)node->cookie);
2850                                         rb_erase(&node->rb_node, &proc->nodes);
2851                                         kfree(node);
2852                                         binder_stats_deleted(BINDER_STAT_NODE);
2853                                 } else {
2854                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2855                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2856                                                      proc->pid, thread->pid,
2857                                                      node->debug_id,
2858                                                      (u64)node->ptr,
2859                                                      (u64)node->cookie);
2860                                 }
2861                         }
2862                 } break;
2863                 case BINDER_WORK_DEAD_BINDER:
2864                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2865                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2866                         struct binder_ref_death *death;
2867                         uint32_t cmd;
2868
2869                         death = container_of(w, struct binder_ref_death, work);
2870                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2871                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2872                         else
2873                                 cmd = BR_DEAD_BINDER;
2874                         if (put_user(cmd, (uint32_t __user *)ptr))
2875                                 return -EFAULT;
2876                         ptr += sizeof(uint32_t);
2877                         if (put_user(death->cookie,
2878                                      (binder_uintptr_t __user *)ptr))
2879                                 return -EFAULT;
2880                         ptr += sizeof(binder_uintptr_t);
2881                         binder_stat_br(proc, thread, cmd);
2882                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2883                                      "%d:%d %s %016llx\n",
2884                                       proc->pid, thread->pid,
2885                                       cmd == BR_DEAD_BINDER ?
2886                                       "BR_DEAD_BINDER" :
2887                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2888                                       (u64)death->cookie);
2889
2890                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2891                                 list_del(&w->entry);
2892                                 kfree(death);
2893                                 binder_stats_deleted(BINDER_STAT_DEATH);
2894                         } else
2895                                 list_move(&w->entry, &proc->delivered_death);
2896                         if (cmd == BR_DEAD_BINDER)
2897                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2898                 } break;
2899                 }
2900
2901                 if (!t)
2902                         continue;
2903
2904                 BUG_ON(t->buffer == NULL);
2905                 if (t->buffer->target_node) {
2906                         struct binder_node *target_node = t->buffer->target_node;
2907
2908                         tr.target.ptr = target_node->ptr;
2909                         tr.cookie =  target_node->cookie;
2910                         t->saved_priority = task_nice(current);
2911                         if (t->priority < target_node->min_priority &&
2912                             !(t->flags & TF_ONE_WAY))
2913                                 binder_set_nice(t->priority);
2914                         else if (!(t->flags & TF_ONE_WAY) ||
2915                                  t->saved_priority > target_node->min_priority)
2916                                 binder_set_nice(target_node->min_priority);
2917                         cmd = BR_TRANSACTION;
2918                 } else {
2919                         tr.target.ptr = 0;
2920                         tr.cookie = 0;
2921                         cmd = BR_REPLY;
2922                 }
2923                 tr.code = t->code;
2924                 tr.flags = t->flags;
2925                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2926
2927                 if (t->from) {
2928                         struct task_struct *sender = t->from->proc->tsk;
2929
2930                         tr.sender_pid = task_tgid_nr_ns(sender,
2931                                                         task_active_pid_ns(current));
2932                 } else {
2933                         tr.sender_pid = 0;
2934                 }
2935
2936                 tr.data_size = t->buffer->data_size;
2937                 tr.offsets_size = t->buffer->offsets_size;
2938                 tr.data.ptr.buffer = (binder_uintptr_t)(
2939                                         (uintptr_t)t->buffer->data +
2940                                         proc->user_buffer_offset);
2941                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2942                                         ALIGN(t->buffer->data_size,
2943                                             sizeof(void *));
2944
2945                 if (put_user(cmd, (uint32_t __user *)ptr))
2946                         return -EFAULT;
2947                 ptr += sizeof(uint32_t);
2948                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2949                         return -EFAULT;
2950                 ptr += sizeof(tr);
2951
2952                 trace_binder_transaction_received(t);
2953                 binder_stat_br(proc, thread, cmd);
2954                 binder_debug(BINDER_DEBUG_TRANSACTION,
2955                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2956                              proc->pid, thread->pid,
2957                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2958                              "BR_REPLY",
2959                              t->debug_id, t->from ? t->from->proc->pid : 0,
2960                              t->from ? t->from->pid : 0, cmd,
2961                              t->buffer->data_size, t->buffer->offsets_size,
2962                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2963
2964                 list_del(&t->work.entry);
2965                 t->buffer->allow_user_free = 1;
2966                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2967                         t->to_parent = thread->transaction_stack;
2968                         t->to_thread = thread;
2969                         thread->transaction_stack = t;
2970                 } else {
2971                         t->buffer->transaction = NULL;
2972                         kfree(t);
2973                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2974                 }
2975                 break;
2976         }
2977
2978 done:
2979
2980         *consumed = ptr - buffer;
2981         if (proc->requested_threads + proc->ready_threads == 0 &&
2982             proc->requested_threads_started < proc->max_threads &&
2983             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2984              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2985              /*spawn a new thread if we leave this out */) {
2986                 proc->requested_threads++;
2987                 binder_debug(BINDER_DEBUG_THREADS,
2988                              "%d:%d BR_SPAWN_LOOPER\n",
2989                              proc->pid, thread->pid);
2990                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2991                         return -EFAULT;
2992                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2993         }
2994         return 0;
2995 }
2996
2997 static void binder_release_work(struct list_head *list)
2998 {
2999         struct binder_work *w;
3000
3001         while (!list_empty(list)) {
3002                 w = list_first_entry(list, struct binder_work, entry);
3003                 list_del_init(&w->entry);
3004                 switch (w->type) {
3005                 case BINDER_WORK_TRANSACTION: {
3006                         struct binder_transaction *t;
3007
3008                         t = container_of(w, struct binder_transaction, work);
3009                         if (t->buffer->target_node &&
3010                             !(t->flags & TF_ONE_WAY)) {
3011                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
3012                         } else {
3013                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3014                                         "undelivered transaction %d\n",
3015                                         t->debug_id);
3016                                 t->buffer->transaction = NULL;
3017                                 kfree(t);
3018                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
3019                         }
3020                 } break;
3021                 case BINDER_WORK_TRANSACTION_COMPLETE: {
3022                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3023                                 "undelivered TRANSACTION_COMPLETE\n");
3024                         kfree(w);
3025                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
3026                 } break;
3027                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3028                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
3029                         struct binder_ref_death *death;
3030
3031                         death = container_of(w, struct binder_ref_death, work);
3032                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3033                                 "undelivered death notification, %016llx\n",
3034                                 (u64)death->cookie);
3035                         kfree(death);
3036                         binder_stats_deleted(BINDER_STAT_DEATH);
3037                 } break;
3038                 default:
3039                         pr_err("unexpected work type, %d, not freed\n",
3040                                w->type);
3041                         break;
3042                 }
3043         }
3044
3045 }
3046
3047 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
3048 {
3049         struct binder_thread *thread = NULL;
3050         struct rb_node *parent = NULL;
3051         struct rb_node **p = &proc->threads.rb_node;
3052
3053         while (*p) {
3054                 parent = *p;
3055                 thread = rb_entry(parent, struct binder_thread, rb_node);
3056
3057                 if (current->pid < thread->pid)
3058                         p = &(*p)->rb_left;
3059                 else if (current->pid > thread->pid)
3060                         p = &(*p)->rb_right;
3061                 else
3062                         break;
3063         }
3064         if (*p == NULL) {
3065                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
3066                 if (thread == NULL)
3067                         return NULL;
3068                 binder_stats_created(BINDER_STAT_THREAD);
3069                 thread->proc = proc;
3070                 thread->pid = current->pid;
3071                 init_waitqueue_head(&thread->wait);
3072                 INIT_LIST_HEAD(&thread->todo);
3073                 rb_link_node(&thread->rb_node, parent, p);
3074                 rb_insert_color(&thread->rb_node, &proc->threads);
3075                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3076                 thread->return_error = BR_OK;
3077                 thread->return_error2 = BR_OK;
3078         }
3079         return thread;
3080 }
3081
3082 static int binder_free_thread(struct binder_proc *proc,
3083                               struct binder_thread *thread)
3084 {
3085         struct binder_transaction *t;
3086         struct binder_transaction *send_reply = NULL;
3087         int active_transactions = 0;
3088
3089         rb_erase(&thread->rb_node, &proc->threads);
3090         t = thread->transaction_stack;
3091         if (t && t->to_thread == thread)
3092                 send_reply = t;
3093         while (t) {
3094                 active_transactions++;
3095                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3096                              "release %d:%d transaction %d %s, still active\n",
3097                               proc->pid, thread->pid,
3098                              t->debug_id,
3099                              (t->to_thread == thread) ? "in" : "out");
3100
3101                 if (t->to_thread == thread) {
3102                         t->to_proc = NULL;
3103                         t->to_thread = NULL;
3104                         if (t->buffer) {
3105                                 t->buffer->transaction = NULL;
3106                                 t->buffer = NULL;
3107                         }
3108                         t = t->to_parent;
3109                 } else if (t->from == thread) {
3110                         t->from = NULL;
3111                         t = t->from_parent;
3112                 } else
3113                         BUG();
3114         }
3115         if (send_reply)
3116                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
3117         binder_release_work(&thread->todo);
3118         kfree(thread);
3119         binder_stats_deleted(BINDER_STAT_THREAD);
3120         return active_transactions;
3121 }
3122
3123 static unsigned int binder_poll(struct file *filp,
3124                                 struct poll_table_struct *wait)
3125 {
3126         struct binder_proc *proc = filp->private_data;
3127         struct binder_thread *thread = NULL;
3128         int wait_for_proc_work;
3129
3130         binder_lock(proc->context, __func__);
3131
3132         thread = binder_get_thread(proc);
3133
3134         wait_for_proc_work = thread->transaction_stack == NULL &&
3135                 list_empty(&thread->todo) && thread->return_error == BR_OK;
3136
3137         binder_unlock(proc->context, __func__);
3138
3139         if (wait_for_proc_work) {
3140                 if (binder_has_proc_work(proc, thread))
3141                         return POLLIN;
3142                 poll_wait(filp, &proc->wait, wait);
3143                 if (binder_has_proc_work(proc, thread))
3144                         return POLLIN;
3145         } else {
3146                 if (binder_has_thread_work(thread))
3147                         return POLLIN;
3148                 poll_wait(filp, &thread->wait, wait);
3149                 if (binder_has_thread_work(thread))
3150                         return POLLIN;
3151         }
3152         return 0;
3153 }
3154
3155 static int binder_ioctl_write_read(struct file *filp,
3156                                 unsigned int cmd, unsigned long arg,
3157                                 struct binder_thread *thread)
3158 {
3159         int ret = 0;
3160         struct binder_proc *proc = filp->private_data;
3161         unsigned int size = _IOC_SIZE(cmd);
3162         void __user *ubuf = (void __user *)arg;
3163         struct binder_write_read bwr;
3164
3165         if (size != sizeof(struct binder_write_read)) {
3166                 ret = -EINVAL;
3167                 goto out;
3168         }
3169         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
3170                 ret = -EFAULT;
3171                 goto out;
3172         }
3173         binder_debug(BINDER_DEBUG_READ_WRITE,
3174                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
3175                      proc->pid, thread->pid,
3176                      (u64)bwr.write_size, (u64)bwr.write_buffer,
3177                      (u64)bwr.read_size, (u64)bwr.read_buffer);
3178
3179         if (bwr.write_size > 0) {
3180                 ret = binder_thread_write(proc, thread,
3181                                           bwr.write_buffer,
3182                                           bwr.write_size,
3183                                           &bwr.write_consumed);
3184                 trace_binder_write_done(ret);
3185                 if (ret < 0) {
3186                         bwr.read_consumed = 0;
3187                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
3188                                 ret = -EFAULT;
3189                         goto out;
3190                 }
3191         }
3192         if (bwr.read_size > 0) {
3193                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
3194                                          bwr.read_size,
3195                                          &bwr.read_consumed,
3196                                          filp->f_flags & O_NONBLOCK);
3197                 trace_binder_read_done(ret);
3198                 if (!list_empty(&proc->todo))
3199                         wake_up_interruptible(&proc->wait);
3200                 if (ret < 0) {
3201                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
3202                                 ret = -EFAULT;
3203                         goto out;
3204                 }
3205         }
3206         binder_debug(BINDER_DEBUG_READ_WRITE,
3207                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
3208                      proc->pid, thread->pid,
3209                      (u64)bwr.write_consumed, (u64)bwr.write_size,
3210                      (u64)bwr.read_consumed, (u64)bwr.read_size);
3211         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
3212                 ret = -EFAULT;
3213                 goto out;
3214         }
3215 out:
3216         return ret;
3217 }
3218
3219 static int binder_ioctl_set_ctx_mgr(struct file *filp)
3220 {
3221         int ret = 0;
3222         struct binder_proc *proc = filp->private_data;
3223         struct binder_context *context = proc->context;
3224
3225         kuid_t curr_euid = current_euid();
3226
3227         if (context->binder_context_mgr_node) {
3228                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
3229                 ret = -EBUSY;
3230                 goto out;
3231         }
3232         ret = security_binder_set_context_mgr(proc->tsk);
3233         if (ret < 0)
3234                 goto out;
3235         if (uid_valid(context->binder_context_mgr_uid)) {
3236                 if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
3237                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
3238                                from_kuid(&init_user_ns, curr_euid),
3239                                from_kuid(&init_user_ns,
3240                                          context->binder_context_mgr_uid));
3241                         ret = -EPERM;
3242                         goto out;
3243                 }
3244         } else {
3245                 context->binder_context_mgr_uid = curr_euid;
3246         }
3247         context->binder_context_mgr_node = binder_new_node(proc, 0, 0);
3248         if (!context->binder_context_mgr_node) {
3249                 ret = -ENOMEM;
3250                 goto out;
3251         }
3252         context->binder_context_mgr_node->local_weak_refs++;
3253         context->binder_context_mgr_node->local_strong_refs++;
3254         context->binder_context_mgr_node->has_strong_ref = 1;
3255         context->binder_context_mgr_node->has_weak_ref = 1;
3256 out:
3257         return ret;
3258 }
3259
3260 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
3261 {
3262         int ret;
3263         struct binder_proc *proc = filp->private_data;
3264         struct binder_context *context = proc->context;
3265         struct binder_thread *thread;
3266         unsigned int size = _IOC_SIZE(cmd);
3267         void __user *ubuf = (void __user *)arg;
3268
3269         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
3270                         proc->pid, current->pid, cmd, arg);*/
3271
3272         trace_binder_ioctl(cmd, arg);
3273
3274         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
3275         if (ret)
3276                 goto err_unlocked;
3277
3278         binder_lock(context, __func__);
3279         thread = binder_get_thread(proc);
3280         if (thread == NULL) {
3281                 ret = -ENOMEM;
3282                 goto err;
3283         }
3284
3285         switch (cmd) {
3286         case BINDER_WRITE_READ:
3287                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
3288                 if (ret)
3289                         goto err;
3290                 break;
3291         case BINDER_SET_MAX_THREADS:
3292                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
3293                         ret = -EINVAL;
3294                         goto err;
3295                 }
3296                 break;
3297         case BINDER_SET_CONTEXT_MGR:
3298                 ret = binder_ioctl_set_ctx_mgr(filp);
3299                 if (ret)
3300                         goto err;
3301                 break;
3302         case BINDER_THREAD_EXIT:
3303                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
3304                              proc->pid, thread->pid);
3305                 binder_free_thread(proc, thread);
3306                 thread = NULL;
3307                 break;
3308         case BINDER_VERSION: {
3309                 struct binder_version __user *ver = ubuf;
3310
3311                 if (size != sizeof(struct binder_version)) {
3312                         ret = -EINVAL;
3313                         goto err;
3314                 }
3315                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
3316                              &ver->protocol_version)) {
3317                         ret = -EINVAL;
3318                         goto err;
3319                 }
3320                 break;
3321         }
3322         default:
3323                 ret = -EINVAL;
3324                 goto err;
3325         }
3326         ret = 0;
3327 err:
3328         if (thread)
3329                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
3330         binder_unlock(context, __func__);
3331         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
3332         if (ret && ret != -ERESTARTSYS)
3333                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
3334 err_unlocked:
3335         trace_binder_ioctl_done(ret);
3336         return ret;
3337 }
3338
3339 static void binder_vma_open(struct vm_area_struct *vma)
3340 {
3341         struct binder_proc *proc = vma->vm_private_data;
3342
3343         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3344                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
3345                      proc->pid, vma->vm_start, vma->vm_end,
3346                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3347                      (unsigned long)pgprot_val(vma->vm_page_prot));
3348 }
3349
3350 static void binder_vma_close(struct vm_area_struct *vma)
3351 {
3352         struct binder_proc *proc = vma->vm_private_data;
3353
3354         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3355                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
3356                      proc->pid, vma->vm_start, vma->vm_end,
3357                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3358                      (unsigned long)pgprot_val(vma->vm_page_prot));
3359         proc->vma = NULL;
3360         proc->vma_vm_mm = NULL;
3361         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
3362 }
3363
3364 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
3365 {
3366         return VM_FAULT_SIGBUS;
3367 }
3368
3369 static const struct vm_operations_struct binder_vm_ops = {
3370         .open = binder_vma_open,
3371         .close = binder_vma_close,
3372         .fault = binder_vm_fault,
3373 };
3374
3375 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
3376 {
3377         int ret;
3378         struct vm_struct *area;
3379         struct binder_proc *proc = filp->private_data;
3380         const char *failure_string;
3381         struct binder_buffer *buffer;
3382
3383         if (proc->tsk != current->group_leader)
3384                 return -EINVAL;
3385
3386         if ((vma->vm_end - vma->vm_start) > SZ_4M)
3387                 vma->vm_end = vma->vm_start + SZ_4M;
3388
3389         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3390                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
3391                      proc->pid, vma->vm_start, vma->vm_end,
3392                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3393                      (unsigned long)pgprot_val(vma->vm_page_prot));
3394
3395         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
3396                 ret = -EPERM;
3397                 failure_string = "bad vm_flags";
3398                 goto err_bad_arg;
3399         }
3400         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
3401
3402         mutex_lock(&proc->context->binder_mmap_lock);
3403         if (proc->buffer) {
3404                 ret = -EBUSY;
3405                 failure_string = "already mapped";
3406                 goto err_already_mapped;
3407         }
3408
3409         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
3410         if (area == NULL) {
3411                 ret = -ENOMEM;
3412                 failure_string = "get_vm_area";
3413                 goto err_get_vm_area_failed;
3414         }
3415         proc->buffer = area->addr;
3416         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
3417         mutex_unlock(&proc->context->binder_mmap_lock);
3418
3419 #ifdef CONFIG_CPU_CACHE_VIPT
3420         if (cache_is_vipt_aliasing()) {
3421                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
3422                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
3423                         vma->vm_start += PAGE_SIZE;
3424                 }
3425         }
3426 #endif
3427         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
3428         if (proc->pages == NULL) {
3429                 ret = -ENOMEM;
3430                 failure_string = "alloc page array";
3431                 goto err_alloc_pages_failed;
3432         }
3433         proc->buffer_size = vma->vm_end - vma->vm_start;
3434
3435         vma->vm_ops = &binder_vm_ops;
3436         vma->vm_private_data = proc;
3437
3438         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
3439                 ret = -ENOMEM;
3440                 failure_string = "alloc small buf";
3441                 goto err_alloc_small_buf_failed;
3442         }
3443         buffer = proc->buffer;
3444         INIT_LIST_HEAD(&proc->buffers);
3445         list_add(&buffer->entry, &proc->buffers);
3446         buffer->free = 1;
3447         binder_insert_free_buffer(proc, buffer);
3448         proc->free_async_space = proc->buffer_size / 2;
3449         barrier();
3450         proc->files = get_files_struct(current);
3451         proc->vma = vma;
3452         proc->vma_vm_mm = vma->vm_mm;
3453
3454         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
3455                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
3456         return 0;
3457
3458 err_alloc_small_buf_failed:
3459         kfree(proc->pages);
3460         proc->pages = NULL;
3461 err_alloc_pages_failed:
3462         mutex_lock(&proc->context->binder_mmap_lock);
3463         vfree(proc->buffer);
3464         proc->buffer = NULL;
3465 err_get_vm_area_failed:
3466 err_already_mapped:
3467         mutex_unlock(&proc->context->binder_mmap_lock);
3468 err_bad_arg:
3469         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
3470                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
3471         return ret;
3472 }
3473
3474 static int binder_open(struct inode *nodp, struct file *filp)
3475 {
3476         struct binder_proc *proc;
3477         struct binder_device *binder_dev;
3478
3479         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
3480                      current->group_leader->pid, current->pid);
3481
3482         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
3483         if (proc == NULL)
3484                 return -ENOMEM;
3485         get_task_struct(current->group_leader);
3486         proc->tsk = current->group_leader;
3487         INIT_LIST_HEAD(&proc->todo);
3488         init_waitqueue_head(&proc->wait);
3489         proc->default_priority = task_nice(current);
3490         binder_dev = container_of(filp->private_data, struct binder_device,
3491                                   miscdev);
3492         proc->context = &binder_dev->context;
3493
3494         binder_lock(proc->context, __func__);
3495
3496         binder_stats_created(BINDER_STAT_PROC);
3497         hlist_add_head(&proc->proc_node, &proc->context->binder_procs);
3498         proc->pid = current->group_leader->pid;
3499         INIT_LIST_HEAD(&proc->delivered_death);
3500         filp->private_data = proc;
3501
3502         binder_unlock(proc->context, __func__);
3503
3504         if (binder_debugfs_dir_entry_proc) {
3505                 char strbuf[11];
3506
3507                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
3508                 /*
3509                  * proc debug entries are shared between contexts, so
3510                  * this will fail if the process tries to open the driver
3511                  * again with a different context. The priting code will
3512                  * anyway print all contexts that a given PID has, so this
3513                  * is not a problem.
3514                  */
3515                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
3516                         binder_debugfs_dir_entry_proc,
3517                         (void *)(unsigned long)proc->pid,
3518                         &binder_proc_fops);
3519         }
3520
3521         return 0;
3522 }
3523
3524 static int binder_flush(struct file *filp, fl_owner_t id)
3525 {
3526         struct binder_proc *proc = filp->private_data;
3527
3528         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3529
3530         return 0;
3531 }
3532
3533 static void binder_deferred_flush(struct binder_proc *proc)
3534 {
3535         struct rb_node *n;
3536         int wake_count = 0;
3537
3538         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3539                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3540
3541                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3542                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3543                         wake_up_interruptible(&thread->wait);
3544                         wake_count++;
3545                 }
3546         }
3547         wake_up_interruptible_all(&proc->wait);
3548
3549         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3550                      "binder_flush: %d woke %d threads\n", proc->pid,
3551                      wake_count);
3552 }
3553
3554 static int binder_release(struct inode *nodp, struct file *filp)
3555 {
3556         struct binder_proc *proc = filp->private_data;
3557
3558         debugfs_remove(proc->debugfs_entry);
3559         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3560
3561         return 0;
3562 }
3563
3564 static int binder_node_release(struct binder_node *node, int refs)
3565 {
3566         struct binder_ref *ref;
3567         struct binder_context *context = node->proc->context;
3568         int death = 0;
3569
3570         list_del_init(&node->work.entry);
3571         binder_release_work(&node->async_todo);
3572
3573         if (hlist_empty(&node->refs)) {
3574                 kfree(node);
3575                 binder_stats_deleted(BINDER_STAT_NODE);
3576
3577                 return refs;
3578         }
3579
3580         node->proc = NULL;
3581         node->local_strong_refs = 0;
3582         node->local_weak_refs = 0;
3583         hlist_add_head(&node->dead_node, &context->binder_dead_nodes);
3584
3585         hlist_for_each_entry(ref, &node->refs, node_entry) {
3586                 refs++;
3587
3588                 if (!ref->death)
3589                         continue;
3590
3591                 death++;
3592
3593                 if (list_empty(&ref->death->work.entry)) {
3594                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3595                         list_add_tail(&ref->death->work.entry,
3596                                       &ref->proc->todo);
3597                         wake_up_interruptible(&ref->proc->wait);
3598                 } else
3599                         BUG();
3600         }
3601
3602         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3603                      "node %d now dead, refs %d, death %d\n",
3604                      node->debug_id, refs, death);
3605
3606         return refs;
3607 }
3608
3609 static void binder_deferred_release(struct binder_proc *proc)
3610 {
3611         struct binder_transaction *t;
3612         struct binder_context *context = proc->context;
3613         struct rb_node *n;
3614         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3615                 active_transactions, page_count;
3616
3617         BUG_ON(proc->vma);
3618         BUG_ON(proc->files);
3619
3620         hlist_del(&proc->proc_node);
3621
3622         if (context->binder_context_mgr_node &&
3623             context->binder_context_mgr_node->proc == proc) {
3624                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3625                              "%s: %d context_mgr_node gone\n",
3626                              __func__, proc->pid);
3627                 context->binder_context_mgr_node = NULL;
3628         }
3629
3630         threads = 0;
3631         active_transactions = 0;
3632         while ((n = rb_first(&proc->threads))) {
3633                 struct binder_thread *thread;
3634
3635                 thread = rb_entry(n, struct binder_thread, rb_node);
3636                 threads++;
3637                 active_transactions += binder_free_thread(proc, thread);
3638         }
3639
3640         nodes = 0;
3641         incoming_refs = 0;
3642         while ((n = rb_first(&proc->nodes))) {
3643                 struct binder_node *node;
3644
3645                 node = rb_entry(n, struct binder_node, rb_node);
3646                 nodes++;
3647                 rb_erase(&node->rb_node, &proc->nodes);
3648                 incoming_refs = binder_node_release(node,
3649                                                     incoming_refs);
3650         }
3651
3652         outgoing_refs = 0;
3653         while ((n = rb_first(&proc->refs_by_desc))) {
3654                 struct binder_ref *ref;
3655
3656                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3657                 outgoing_refs++;
3658                 binder_delete_ref(ref);
3659         }
3660
3661         binder_release_work(&proc->todo);
3662         binder_release_work(&proc->delivered_death);
3663
3664         buffers = 0;
3665         while ((n = rb_first(&proc->allocated_buffers))) {
3666                 struct binder_buffer *buffer;
3667
3668                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3669
3670                 t = buffer->transaction;
3671                 if (t) {
3672                         t->buffer = NULL;
3673                         buffer->transaction = NULL;
3674                         pr_err("release proc %d, transaction %d, not freed\n",
3675                                proc->pid, t->debug_id);
3676                         /*BUG();*/
3677                 }
3678
3679                 binder_free_buf(proc, buffer);
3680                 buffers++;
3681         }
3682
3683         binder_stats_deleted(BINDER_STAT_PROC);
3684
3685         page_count = 0;
3686         if (proc->pages) {
3687                 int i;
3688
3689                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3690                         void *page_addr;
3691
3692                         if (!proc->pages[i])
3693                                 continue;
3694
3695                         page_addr = proc->buffer + i * PAGE_SIZE;
3696                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3697                                      "%s: %d: page %d at %p not freed\n",
3698                                      __func__, proc->pid, i, page_addr);
3699                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3700                         __free_page(proc->pages[i]);
3701                         page_count++;
3702                 }
3703                 kfree(proc->pages);
3704                 vfree(proc->buffer);
3705         }
3706
3707         put_task_struct(proc->tsk);
3708
3709         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3710                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3711                      __func__, proc->pid, threads, nodes, incoming_refs,
3712                      outgoing_refs, active_transactions, buffers, page_count);
3713
3714         kfree(proc);
3715 }
3716
3717 static void binder_deferred_func(struct work_struct *work)
3718 {
3719         struct binder_proc *proc;
3720         struct files_struct *files;
3721         struct binder_context *context =
3722                 container_of(work, struct binder_context, deferred_work);
3723
3724         int defer;
3725
3726         do {
3727                 binder_lock(context, __func__);
3728                 mutex_lock(&context->binder_deferred_lock);
3729                 if (!hlist_empty(&context->binder_deferred_list)) {
3730                         proc = hlist_entry(context->binder_deferred_list.first,
3731                                         struct binder_proc, deferred_work_node);
3732                         hlist_del_init(&proc->deferred_work_node);
3733                         defer = proc->deferred_work;
3734                         proc->deferred_work = 0;
3735                 } else {
3736                         proc = NULL;
3737                         defer = 0;
3738                 }
3739                 mutex_unlock(&context->binder_deferred_lock);
3740
3741                 files = NULL;
3742                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3743                         files = proc->files;
3744                         if (files)
3745                                 proc->files = NULL;
3746                 }
3747
3748                 if (defer & BINDER_DEFERRED_FLUSH)
3749                         binder_deferred_flush(proc);
3750
3751                 if (defer & BINDER_DEFERRED_RELEASE)
3752                         binder_deferred_release(proc); /* frees proc */
3753
3754                 binder_unlock(context, __func__);
3755                 if (files)
3756                         put_files_struct(files);
3757         } while (proc);
3758 }
3759
3760 static void
3761 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3762 {
3763         mutex_lock(&proc->context->binder_deferred_lock);
3764         proc->deferred_work |= defer;
3765         if (hlist_unhashed(&proc->deferred_work_node)) {
3766                 hlist_add_head(&proc->deferred_work_node,
3767                                 &proc->context->binder_deferred_list);
3768                 queue_work(proc->context->binder_deferred_workqueue,
3769                            &proc->context->deferred_work);
3770         }
3771         mutex_unlock(&proc->context->binder_deferred_lock);
3772 }
3773
3774 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3775                                      struct binder_transaction *t)
3776 {
3777         seq_printf(m,
3778                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3779                    prefix, t->debug_id, t,
3780                    t->from ? t->from->proc->pid : 0,
3781                    t->from ? t->from->pid : 0,
3782                    t->to_proc ? t->to_proc->pid : 0,
3783                    t->to_thread ? t->to_thread->pid : 0,
3784                    t->code, t->flags, t->priority, t->need_reply);
3785         if (t->buffer == NULL) {
3786                 seq_puts(m, " buffer free\n");
3787                 return;
3788         }
3789         if (t->buffer->target_node)
3790                 seq_printf(m, " node %d",
3791                            t->buffer->target_node->debug_id);
3792         seq_printf(m, " size %zd:%zd data %p\n",
3793                    t->buffer->data_size, t->buffer->offsets_size,
3794                    t->buffer->data);
3795 }
3796
3797 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3798                                 struct binder_buffer *buffer)
3799 {
3800         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3801                    prefix, buffer->debug_id, buffer->data,
3802                    buffer->data_size, buffer->offsets_size,
3803                    buffer->transaction ? "active" : "delivered");
3804 }
3805
3806 static void print_binder_work(struct seq_file *m, const char *prefix,
3807                               const char *transaction_prefix,
3808                               struct binder_work *w)
3809 {
3810         struct binder_node *node;
3811         struct binder_transaction *t;
3812
3813         switch (w->type) {
3814         case BINDER_WORK_TRANSACTION:
3815                 t = container_of(w, struct binder_transaction, work);
3816                 print_binder_transaction(m, transaction_prefix, t);
3817                 break;
3818         case BINDER_WORK_TRANSACTION_COMPLETE:
3819                 seq_printf(m, "%stransaction complete\n", prefix);
3820                 break;
3821         case BINDER_WORK_NODE:
3822                 node = container_of(w, struct binder_node, work);
3823                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3824                            prefix, node->debug_id,
3825                            (u64)node->ptr, (u64)node->cookie);
3826                 break;
3827         case BINDER_WORK_DEAD_BINDER:
3828                 seq_printf(m, "%shas dead binder\n", prefix);
3829                 break;
3830         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3831                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3832                 break;
3833         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3834                 seq_printf(m, "%shas cleared death notification\n", prefix);
3835                 break;
3836         default:
3837                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3838                 break;
3839         }
3840 }
3841
3842 static void print_binder_thread(struct seq_file *m,
3843                                 struct binder_thread *thread,
3844                                 int print_always)
3845 {
3846         struct binder_transaction *t;
3847         struct binder_work *w;
3848         size_t start_pos = m->count;
3849         size_t header_pos;
3850
3851         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3852         header_pos = m->count;
3853         t = thread->transaction_stack;
3854         while (t) {
3855                 if (t->from == thread) {
3856                         print_binder_transaction(m,
3857                                                  "    outgoing transaction", t);
3858                         t = t->from_parent;
3859                 } else if (t->to_thread == thread) {
3860                         print_binder_transaction(m,
3861                                                  "    incoming transaction", t);
3862                         t = t->to_parent;
3863                 } else {
3864                         print_binder_transaction(m, "    bad transaction", t);
3865                         t = NULL;
3866                 }
3867         }
3868         list_for_each_entry(w, &thread->todo, entry) {
3869                 print_binder_work(m, "    ", "    pending transaction", w);
3870         }
3871         if (!print_always && m->count == header_pos)
3872                 m->count = start_pos;
3873 }
3874
3875 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3876 {
3877         struct binder_ref *ref;
3878         struct binder_work *w;
3879         int count;
3880
3881         count = 0;
3882         hlist_for_each_entry(ref, &node->refs, node_entry)
3883                 count++;
3884
3885         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3886                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3887                    node->has_strong_ref, node->has_weak_ref,
3888                    node->local_strong_refs, node->local_weak_refs,
3889                    node->internal_strong_refs, count);
3890         if (count) {
3891                 seq_puts(m, " proc");
3892                 hlist_for_each_entry(ref, &node->refs, node_entry)
3893                         seq_printf(m, " %d", ref->proc->pid);
3894         }
3895         seq_puts(m, "\n");
3896         list_for_each_entry(w, &node->async_todo, entry)
3897                 print_binder_work(m, "    ",
3898                                   "    pending async transaction", w);
3899 }
3900
3901 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3902 {
3903         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3904                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3905                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3906 }
3907
3908 static void print_binder_proc(struct seq_file *m,
3909                               struct binder_proc *proc, int print_all)
3910 {
3911         struct binder_work *w;
3912         struct rb_node *n;
3913         size_t start_pos = m->count;
3914         size_t header_pos;
3915
3916         seq_printf(m, "proc %d\n", proc->pid);
3917         seq_printf(m, "context %s\n", proc->context->name);
3918         header_pos = m->count;
3919
3920         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3921                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3922                                                 rb_node), print_all);
3923         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3924                 struct binder_node *node = rb_entry(n, struct binder_node,
3925                                                     rb_node);
3926                 if (print_all || node->has_async_transaction)
3927                         print_binder_node(m, node);
3928         }
3929         if (print_all) {
3930                 for (n = rb_first(&proc->refs_by_desc);
3931                      n != NULL;
3932                      n = rb_next(n))
3933                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3934                                                      rb_node_desc));
3935         }
3936         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3937                 print_binder_buffer(m, "  buffer",
3938                                     rb_entry(n, struct binder_buffer, rb_node));
3939         list_for_each_entry(w, &proc->todo, entry)
3940                 print_binder_work(m, "  ", "  pending transaction", w);
3941         list_for_each_entry(w, &proc->delivered_death, entry) {
3942                 seq_puts(m, "  has delivered dead binder\n");
3943                 break;
3944         }
3945         if (!print_all && m->count == header_pos)
3946                 m->count = start_pos;
3947 }
3948
3949 static const char * const binder_return_strings[] = {
3950         "BR_ERROR",
3951         "BR_OK",
3952         "BR_TRANSACTION",
3953         "BR_REPLY",
3954         "BR_ACQUIRE_RESULT",
3955         "BR_DEAD_REPLY",
3956         "BR_TRANSACTION_COMPLETE",
3957         "BR_INCREFS",
3958         "BR_ACQUIRE",
3959         "BR_RELEASE",
3960         "BR_DECREFS",
3961         "BR_ATTEMPT_ACQUIRE",
3962         "BR_NOOP",
3963         "BR_SPAWN_LOOPER",
3964         "BR_FINISHED",
3965         "BR_DEAD_BINDER",
3966         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3967         "BR_FAILED_REPLY"
3968 };
3969
3970 static const char * const binder_command_strings[] = {
3971         "BC_TRANSACTION",
3972         "BC_REPLY",
3973         "BC_ACQUIRE_RESULT",
3974         "BC_FREE_BUFFER",
3975         "BC_INCREFS",
3976         "BC_ACQUIRE",
3977         "BC_RELEASE",
3978         "BC_DECREFS",
3979         "BC_INCREFS_DONE",
3980         "BC_ACQUIRE_DONE",
3981         "BC_ATTEMPT_ACQUIRE",
3982         "BC_REGISTER_LOOPER",
3983         "BC_ENTER_LOOPER",
3984         "BC_EXIT_LOOPER",
3985         "BC_REQUEST_DEATH_NOTIFICATION",
3986         "BC_CLEAR_DEATH_NOTIFICATION",
3987         "BC_DEAD_BINDER_DONE",
3988         "BC_TRANSACTION_SG",
3989         "BC_REPLY_SG",
3990 };
3991
3992 static const char * const binder_objstat_strings[] = {
3993         "proc",
3994         "thread",
3995         "node",
3996         "ref",
3997         "death",
3998         "transaction",
3999         "transaction_complete"
4000 };
4001
4002 static void add_binder_stats(struct binder_stats *from, struct binder_stats *to)
4003 {
4004         int i;
4005
4006         for (i = 0; i < ARRAY_SIZE(to->bc); i++)
4007                 to->bc[i] += from->bc[i];
4008
4009         for (i = 0; i < ARRAY_SIZE(to->br); i++)
4010                 to->br[i] += from->br[i];
4011 }
4012
4013 static void print_binder_stats(struct seq_file *m, const char *prefix,
4014                                struct binder_stats *stats,
4015                                struct binder_obj_stats *obj_stats)
4016 {
4017         int i;
4018
4019         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
4020                      ARRAY_SIZE(binder_command_strings));
4021         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
4022                 if (stats->bc[i])
4023                         seq_printf(m, "%s%s: %d\n", prefix,
4024                                    binder_command_strings[i], stats->bc[i]);
4025         }
4026
4027         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
4028                      ARRAY_SIZE(binder_return_strings));
4029         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
4030                 if (stats->br[i])
4031                         seq_printf(m, "%s%s: %d\n", prefix,
4032                                    binder_return_strings[i], stats->br[i]);
4033         }
4034
4035         if (!obj_stats)
4036                 return;
4037
4038         BUILD_BUG_ON(ARRAY_SIZE(obj_stats->obj_created) !=
4039                      ARRAY_SIZE(binder_objstat_strings));
4040         BUILD_BUG_ON(ARRAY_SIZE(obj_stats->obj_created) !=
4041                      ARRAY_SIZE(obj_stats->obj_deleted));
4042         for (i = 0; i < ARRAY_SIZE(obj_stats->obj_created); i++) {
4043                 int obj_created = atomic_read(&obj_stats->obj_created[i]);
4044                 int obj_deleted = atomic_read(&obj_stats->obj_deleted[i]);
4045
4046                 if (obj_created || obj_deleted)
4047                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
4048                                    binder_objstat_strings[i],
4049                                    obj_created - obj_deleted, obj_created);
4050         }
4051 }
4052
4053 static void print_binder_proc_stats(struct seq_file *m,
4054                                     struct binder_proc *proc)
4055 {
4056         struct binder_work *w;
4057         struct rb_node *n;
4058         int count, strong, weak;
4059
4060         seq_printf(m, "proc %d\n", proc->pid);
4061         seq_printf(m, "context %s\n", proc->context->name);
4062         count = 0;
4063         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
4064                 count++;
4065         seq_printf(m, "  threads: %d\n", count);
4066         seq_printf(m, "  requested threads: %d+%d/%d\n"
4067                         "  ready threads %d\n"
4068                         "  free async space %zd\n", proc->requested_threads,
4069                         proc->requested_threads_started, proc->max_threads,
4070                         proc->ready_threads, proc->free_async_space);
4071         count = 0;
4072         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
4073                 count++;
4074         seq_printf(m, "  nodes: %d\n", count);
4075         count = 0;
4076         strong = 0;
4077         weak = 0;
4078         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
4079                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
4080                                                   rb_node_desc);
4081                 count++;
4082                 strong += ref->strong;
4083                 weak += ref->weak;
4084         }
4085         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
4086
4087         count = 0;
4088         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
4089                 count++;
4090         seq_printf(m, "  buffers: %d\n", count);
4091
4092         count = 0;
4093         list_for_each_entry(w, &proc->todo, entry) {
4094                 switch (w->type) {
4095                 case BINDER_WORK_TRANSACTION:
4096                         count++;
4097                         break;
4098                 default:
4099                         break;
4100                 }
4101         }
4102         seq_printf(m, "  pending transactions: %d\n", count);
4103
4104         print_binder_stats(m, "  ", &proc->stats, NULL);
4105 }
4106
4107
4108 static int binder_state_show(struct seq_file *m, void *unused)
4109 {
4110         struct binder_device *device;
4111         struct binder_context *context;
4112         struct binder_proc *proc;
4113         struct binder_node *node;
4114         int do_lock = !binder_debug_no_lock;
4115         bool wrote_dead_nodes_header = false;
4116
4117         seq_puts(m, "binder state:\n");
4118
4119         hlist_for_each_entry(device, &binder_devices, hlist) {
4120                 context = &device->context;
4121                 if (do_lock)
4122                         binder_lock(context, __func__);
4123                 if (!wrote_dead_nodes_header &&
4124                     !hlist_empty(&context->binder_dead_nodes)) {
4125                         seq_puts(m, "dead nodes:\n");
4126                         wrote_dead_nodes_header = true;
4127                 }
4128                 hlist_for_each_entry(node, &context->binder_dead_nodes,
4129                                      dead_node)
4130                         print_binder_node(m, node);
4131
4132                 if (do_lock)
4133                         binder_unlock(context, __func__);
4134         }
4135
4136         hlist_for_each_entry(device, &binder_devices, hlist) {
4137                 context = &device->context;
4138                 if (do_lock)
4139                         binder_lock(context, __func__);
4140
4141                 hlist_for_each_entry(proc, &context->binder_procs, proc_node)
4142                         print_binder_proc(m, proc, 1);
4143                 if (do_lock)
4144                         binder_unlock(context, __func__);
4145         }
4146         return 0;
4147 }
4148
4149 static int binder_stats_show(struct seq_file *m, void *unused)
4150 {
4151         struct binder_device *device;
4152         struct binder_context *context;
4153         struct binder_proc *proc;
4154         struct binder_stats total_binder_stats;
4155         int do_lock = !binder_debug_no_lock;
4156
4157         memset(&total_binder_stats, 0, sizeof(struct binder_stats));
4158
4159         hlist_for_each_entry(device, &binder_devices, hlist) {
4160                 context = &device->context;
4161                 if (do_lock)
4162                         binder_lock(context, __func__);
4163
4164                 add_binder_stats(&context->binder_stats, &total_binder_stats);
4165
4166                 if (do_lock)
4167                         binder_unlock(context, __func__);
4168         }
4169
4170         seq_puts(m, "binder stats:\n");
4171         print_binder_stats(m, "", &total_binder_stats, &binder_obj_stats);
4172
4173         hlist_for_each_entry(device, &binder_devices, hlist) {
4174                 context = &device->context;
4175                 if (do_lock)
4176                         binder_lock(context, __func__);
4177
4178                 hlist_for_each_entry(proc, &context->binder_procs, proc_node)
4179                         print_binder_proc_stats(m, proc);
4180                 if (do_lock)
4181                         binder_unlock(context, __func__);
4182         }
4183         return 0;
4184 }
4185
4186 static int binder_transactions_show(struct seq_file *m, void *unused)
4187 {
4188         struct binder_device *device;
4189         struct binder_context *context;
4190         struct binder_proc *proc;
4191         int do_lock = !binder_debug_no_lock;
4192
4193         seq_puts(m, "binder transactions:\n");
4194         hlist_for_each_entry(device, &binder_devices, hlist) {
4195                 context = &device->context;
4196                 if (do_lock)
4197                         binder_lock(context, __func__);
4198
4199                 hlist_for_each_entry(proc, &context->binder_procs, proc_node)
4200                         print_binder_proc(m, proc, 0);
4201                 if (do_lock)
4202                         binder_unlock(context, __func__);
4203         }
4204         return 0;
4205 }
4206
4207 static int binder_proc_show(struct seq_file *m, void *unused)
4208 {
4209         struct binder_device *device;
4210         struct binder_context *context;
4211         struct binder_proc *itr;
4212         int pid = (unsigned long)m->private;
4213         int do_lock = !binder_debug_no_lock;
4214
4215         hlist_for_each_entry(device, &binder_devices, hlist) {
4216                 context = &device->context;
4217                 if (do_lock)
4218                         binder_lock(context, __func__);
4219
4220                 hlist_for_each_entry(itr, &context->binder_procs, proc_node) {
4221                         if (itr->pid == pid) {
4222                                 seq_puts(m, "binder proc state:\n");
4223                                 print_binder_proc(m, itr, 1);
4224                         }
4225                 }
4226                 if (do_lock)
4227                         binder_unlock(context, __func__);
4228         }
4229         return 0;
4230 }
4231
4232 static void print_binder_transaction_log_entry(struct seq_file *m,
4233                                         struct binder_transaction_log_entry *e)
4234 {
4235         seq_printf(m,
4236                    "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d\n",
4237                    e->debug_id, (e->call_type == 2) ? "reply" :
4238                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
4239                    e->from_thread, e->to_proc, e->to_thread, e->context_name,
4240                    e->to_node, e->target_handle, e->data_size, e->offsets_size);
4241 }
4242
4243 static int print_binder_transaction_log(struct seq_file *m,
4244                                         struct binder_transaction_log *log)
4245 {
4246         int i;
4247         if (log->full) {
4248                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
4249                         print_binder_transaction_log_entry(m, &log->entry[i]);
4250         }
4251         for (i = 0; i < log->next; i++)
4252                 print_binder_transaction_log_entry(m, &log->entry[i]);
4253         return 0;
4254 }
4255
4256 static int binder_transaction_log_show(struct seq_file *m, void *unused)
4257 {
4258         struct binder_device *device;
4259         struct binder_context *context;
4260
4261         hlist_for_each_entry(device, &binder_devices, hlist) {
4262                 context = &device->context;
4263                 print_binder_transaction_log(m, &context->transaction_log);
4264         }
4265         return 0;
4266 }
4267
4268 static int binder_failed_transaction_log_show(struct seq_file *m, void *unused)
4269 {
4270         struct binder_device *device;
4271         struct binder_context *context;
4272
4273         hlist_for_each_entry(device, &binder_devices, hlist) {
4274                 context = &device->context;
4275                 print_binder_transaction_log(m,
4276                                              &context->transaction_log_failed);
4277         }
4278         return 0;
4279 }
4280
4281 static const struct file_operations binder_fops = {
4282         .owner = THIS_MODULE,
4283         .poll = binder_poll,
4284         .unlocked_ioctl = binder_ioctl,
4285         .compat_ioctl = binder_ioctl,
4286         .mmap = binder_mmap,
4287         .open = binder_open,
4288         .flush = binder_flush,
4289         .release = binder_release,
4290 };
4291
4292 BINDER_DEBUG_ENTRY(state);
4293 BINDER_DEBUG_ENTRY(stats);
4294 BINDER_DEBUG_ENTRY(transactions);
4295 BINDER_DEBUG_ENTRY(transaction_log);
4296 BINDER_DEBUG_ENTRY(failed_transaction_log);
4297
4298 static void __init free_binder_device(struct binder_device *device)
4299 {
4300         if (device->context.binder_deferred_workqueue)
4301                 destroy_workqueue(device->context.binder_deferred_workqueue);
4302         kfree(device);
4303 }
4304
4305 static int __init init_binder_device(const char *name)
4306 {
4307         int ret;
4308         struct binder_device *binder_device;
4309         struct binder_context *context;
4310
4311         binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL);
4312         if (!binder_device)
4313                 return -ENOMEM;
4314
4315         binder_device->miscdev.fops = &binder_fops;
4316         binder_device->miscdev.minor = MISC_DYNAMIC_MINOR;
4317         binder_device->miscdev.name = name;
4318
4319         context = &binder_device->context;
4320         context->binder_context_mgr_uid = INVALID_UID;
4321         context->name = name;
4322
4323         mutex_init(&context->binder_main_lock);
4324         mutex_init(&context->binder_deferred_lock);
4325         mutex_init(&context->binder_mmap_lock);
4326
4327         context->binder_deferred_workqueue =
4328                 create_singlethread_workqueue(name);
4329
4330         if (!context->binder_deferred_workqueue) {
4331                 ret = -ENOMEM;
4332                 goto err_create_singlethread_workqueue_failed;
4333         }
4334
4335         INIT_HLIST_HEAD(&context->binder_procs);
4336         INIT_HLIST_HEAD(&context->binder_dead_nodes);
4337         INIT_HLIST_HEAD(&context->binder_deferred_list);
4338         INIT_WORK(&context->deferred_work, binder_deferred_func);
4339
4340         ret = misc_register(&binder_device->miscdev);
4341         if (ret < 0) {
4342                 goto err_misc_register_failed;
4343         }
4344
4345         hlist_add_head(&binder_device->hlist, &binder_devices);
4346         return ret;
4347
4348 err_create_singlethread_workqueue_failed:
4349 err_misc_register_failed:
4350         free_binder_device(binder_device);
4351
4352         return ret;
4353 }
4354
4355 static int __init binder_init(void)
4356 {
4357         int ret = 0;
4358         char *device_name, *device_names;
4359         struct binder_device *device;
4360         struct hlist_node *tmp;
4361
4362         /*
4363          * Copy the module_parameter string, because we don't want to
4364          * tokenize it in-place.
4365          */
4366         device_names = kzalloc(strlen(binder_devices_param) + 1, GFP_KERNEL);
4367         if (!device_names)
4368                 return -ENOMEM;
4369
4370         strcpy(device_names, binder_devices_param);
4371
4372         while ((device_name = strsep(&device_names, ","))) {
4373                 ret = init_binder_device(device_name);
4374                 if (ret)
4375                         goto err_init_binder_device_failed;
4376         }
4377
4378         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
4379         if (binder_debugfs_dir_entry_root)
4380                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
4381                                                  binder_debugfs_dir_entry_root);
4382
4383         if (binder_debugfs_dir_entry_root) {
4384                 debugfs_create_file("state",
4385                                     S_IRUGO,
4386                                     binder_debugfs_dir_entry_root,
4387                                     NULL,
4388                                     &binder_state_fops);
4389                 debugfs_create_file("stats",
4390                                     S_IRUGO,
4391                                     binder_debugfs_dir_entry_root,
4392                                     NULL,
4393                                     &binder_stats_fops);
4394                 debugfs_create_file("transactions",
4395                                     S_IRUGO,
4396                                     binder_debugfs_dir_entry_root,
4397                                     NULL,
4398                                     &binder_transactions_fops);
4399                 debugfs_create_file("transaction_log",
4400                                     S_IRUGO,
4401                                     binder_debugfs_dir_entry_root,
4402                                     NULL,
4403                                     &binder_transaction_log_fops);
4404                 debugfs_create_file("failed_transaction_log",
4405                                     S_IRUGO,
4406                                     binder_debugfs_dir_entry_root,
4407                                     NULL,
4408                                     &binder_failed_transaction_log_fops);
4409         }
4410
4411         return ret;
4412
4413 err_init_binder_device_failed:
4414         hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
4415                 misc_deregister(&device->miscdev);
4416                 hlist_del(&device->hlist);
4417                 free_binder_device(device);
4418         }
4419
4420         return ret;
4421 }
4422
4423 device_initcall(binder_init);
4424
4425 #define CREATE_TRACE_POINTS
4426 #include "binder_trace.h"
4427
4428 MODULE_LICENSE("GPL v2");