security/selinux/selinuxfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
   3  *
   4  *      Added conditional policy language extensions
   5  *
   6  *  Updated: Hewlett-Packard <paul@paul-moore.com>
   7  *
   8  *      Added support for the policy capability bitmap
   9  *
  10  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  11  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  12  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/slab.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/fs.h>
  20 #include <linux/fs_context.h>
  21 #include <linux/mount.h>
  22 #include <linux/mutex.h>
  23 #include <linux/init.h>
  24 #include <linux/string.h>
  25 #include <linux/security.h>
  26 #include <linux/major.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/percpu.h>
  29 #include <linux/audit.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/kobject.h>
  32 #include <linux/ctype.h>
  33
  34 /* selinuxfs pseudo filesystem for exporting the security policy API.
  35    Based on the proc code and the fs/nfsd/nfsctl.c code. */
  36
  37 #include "flask.h"
  38 #include "avc.h"
  39 #include "avc_ss.h"
  40 #include "security.h"
  41 #include "objsec.h"
  42 #include "conditional.h"
  43
  44 enum sel_inos {
  45         SEL_ROOT_INO = 2,
  46         SEL_LOAD,       /* load policy */
  47         SEL_ENFORCE,    /* get or set enforcing status */
  48         SEL_CONTEXT,    /* validate context */
  49         SEL_ACCESS,     /* compute access decision */
  50         SEL_CREATE,     /* compute create labeling decision */
  51         SEL_RELABEL,    /* compute relabeling decision */
  52         SEL_USER,       /* compute reachable user contexts */
  53         SEL_POLICYVERS, /* return policy version for this kernel */
  54         SEL_COMMIT_BOOLS, /* commit new boolean values */
  55         SEL_MLS,        /* return if MLS policy is enabled */
  56         SEL_DISABLE,    /* disable SELinux until next reboot */
  57         SEL_MEMBER,     /* compute polyinstantiation membership decision */
  58         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
  59         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
  60         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
  61         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
  62         SEL_STATUS,     /* export current status using mmap() */
  63         SEL_POLICY,     /* allow userspace to read the in kernel policy */
  64         SEL_VALIDATE_TRANS, /* compute validatetrans decision */
  65         SEL_INO_NEXT,   /* The next inode number to use */
  66 };
  67
  68 struct selinux_fs_info {
  69         struct dentry *bool_dir;
  70         unsigned int bool_num;
  71         char **bool_pending_names;
  72         unsigned int *bool_pending_values;
  73         struct dentry *class_dir;
  74         unsigned long last_class_ino;
  75         bool policy_opened;
  76         struct dentry *policycap_dir;
  77         struct mutex mutex;
  78         unsigned long last_ino;
  79         struct selinux_state *state;
  80         struct super_block *sb;
  81 };
  82
  83 static int selinux_fs_info_create(struct super_block *sb)
  84 {
  85         struct selinux_fs_info *fsi;
  86
  87         fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
  88         if (!fsi)
  89                 return -ENOMEM;
  90
  91         mutex_init(&fsi->mutex);
  92         fsi->last_ino = SEL_INO_NEXT - 1;
  93         fsi->state = &selinux_state;
  94         fsi->sb = sb;
  95         sb->s_fs_info = fsi;
  96         return 0;
  97 }
  98
  99 static void selinux_fs_info_free(struct super_block *sb)
 100 {
 101         struct selinux_fs_info *fsi = sb->s_fs_info;
 102         int i;
 103
 104         if (fsi) {
 105                 for (i = 0; i < fsi->bool_num; i++)
 106                         kfree(fsi->bool_pending_names[i]);
 107                 kfree(fsi->bool_pending_names);
 108                 kfree(fsi->bool_pending_values);
 109         }
 110         kfree(sb->s_fs_info);
 111         sb->s_fs_info = NULL;
 112 }
 113
 114 #define SEL_INITCON_INO_OFFSET          0x01000000
 115 #define SEL_BOOL_INO_OFFSET             0x02000000
 116 #define SEL_CLASS_INO_OFFSET            0x04000000
 117 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
 118 #define SEL_INO_MASK                    0x00ffffff
 119
 120 #define TMPBUFLEN       12
 121 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 122                                 size_t count, loff_t *ppos)
 123 {
 124         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 125         char tmpbuf[TMPBUFLEN];
 126         ssize_t length;
 127
 128         length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 129                            enforcing_enabled(fsi->state));
 130         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 131 }
 132
 133 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 134 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 135                                  size_t count, loff_t *ppos)
 136
 137 {
 138         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 139         struct selinux_state *state = fsi->state;
 140         char *page = NULL;
 141         ssize_t length;
 142         int old_value, new_value;
 143
 144         if (count >= PAGE_SIZE)
 145                 return -ENOMEM;
 146
 147         /* No partial writes. */
 148         if (*ppos != 0)
 149                 return -EINVAL;
 150
 151         page = memdup_user_nul(buf, count);
 152         if (IS_ERR(page))
 153                 return PTR_ERR(page);
 154
 155         length = -EINVAL;
 156         if (sscanf(page, "%d", &new_value) != 1)
 157                 goto out;
 158
 159         new_value = !!new_value;
 160
 161         old_value = enforcing_enabled(state);
 162         if (new_value != old_value) {
 163                 length = avc_has_perm(&selinux_state,
 164                                       current_sid(), SECINITSID_SECURITY,
 165                                       SECCLASS_SECURITY, SECURITY__SETENFORCE,
 166                                       NULL);
 167                 if (length)
 168                         goto out;
 169                 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 170                         "enforcing=%d old_enforcing=%d auid=%u ses=%u"
 171                         " enabled=1 old-enabled=1 lsm=selinux res=1",
 172                         new_value, old_value,
 173                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
 174                         audit_get_sessionid(current));
 175                 enforcing_set(state, new_value);
 176                 if (new_value)
 177                         avc_ss_reset(state->avc, 0);
 178                 selnl_notify_setenforce(new_value);
 179                 selinux_status_update_setenforce(state, new_value);
 180                 if (!new_value)
 181                         call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
 182         }
 183         length = count;
 184 out:
 185         kfree(page);
 186         return length;
 187 }
 188 #else
 189 #define sel_write_enforce NULL
 190 #endif
 191
 192 static const struct file_operations sel_enforce_ops = {
 193         .read           = sel_read_enforce,
 194         .write          = sel_write_enforce,
 195         .llseek         = generic_file_llseek,
 196 };
 197
 198 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 199                                         size_t count, loff_t *ppos)
 200 {
 201         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 202         struct selinux_state *state = fsi->state;
 203         char tmpbuf[TMPBUFLEN];
 204         ssize_t length;
 205         ino_t ino = file_inode(filp)->i_ino;
 206         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 207                 security_get_reject_unknown(state) :
 208                 !security_get_allow_unknown(state);
 209
 210         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 211         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 212 }
 213
 214 static const struct file_operations sel_handle_unknown_ops = {
 215         .read           = sel_read_handle_unknown,
 216         .llseek         = generic_file_llseek,
 217 };
 218
 219 static int sel_open_handle_status(struct inode *inode, struct file *filp)
 220 {
 221         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 222         struct page    *status = selinux_kernel_status_page(fsi->state);
 223
 224         if (!status)
 225                 return -ENOMEM;
 226
 227         filp->private_data = status;
 228
 229         return 0;
 230 }
 231
 232 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
 233                                       size_t count, loff_t *ppos)
 234 {
 235         struct page    *status = filp->private_data;
 236
 237         BUG_ON(!status);
 238
 239         return simple_read_from_buffer(buf, count, ppos,
 240                                        page_address(status),
 241                                        sizeof(struct selinux_kernel_status));
 242 }
 243
 244 static int sel_mmap_handle_status(struct file *filp,
 245                                   struct vm_area_struct *vma)
 246 {
 247         struct page    *status = filp->private_data;
 248         unsigned long   size = vma->vm_end - vma->vm_start;
 249
 250         BUG_ON(!status);
 251
 252         /* only allows one page from the head */
 253         if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
 254                 return -EIO;
 255         /* disallow writable mapping */
 256         if (vma->vm_flags & VM_WRITE)
 257                 return -EPERM;
 258         /* disallow mprotect() turns it into writable */
 259         vma->vm_flags &= ~VM_MAYWRITE;
 260
 261         return remap_pfn_range(vma, vma->vm_start,
 262                                page_to_pfn(status),
 263                                size, vma->vm_page_prot);
 264 }
 265
 266 static const struct file_operations sel_handle_status_ops = {
 267         .open           = sel_open_handle_status,
 268         .read           = sel_read_handle_status,
 269         .mmap           = sel_mmap_handle_status,
 270         .llseek         = generic_file_llseek,
 271 };
 272
 273 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 274 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 275                                  size_t count, loff_t *ppos)
 276
 277 {
 278         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 279         char *page;
 280         ssize_t length;
 281         int new_value;
 282         int enforcing;
 283
 284         /* NOTE: we are now officially considering runtime disable as
 285          *       deprecated, and using it will become increasingly painful
 286          *       (e.g. sleeping/blocking) as we progress through future
 287          *       kernel releases until eventually it is removed
 288          */
 289         pr_err("SELinux:  Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
 290
 291         if (count >= PAGE_SIZE)
 292                 return -ENOMEM;
 293
 294         /* No partial writes. */
 295         if (*ppos != 0)
 296                 return -EINVAL;
 297
 298         page = memdup_user_nul(buf, count);
 299         if (IS_ERR(page))
 300                 return PTR_ERR(page);
 301
 302         length = -EINVAL;
 303         if (sscanf(page, "%d", &new_value) != 1)
 304                 goto out;
 305
 306         if (new_value) {
 307                 enforcing = enforcing_enabled(fsi->state);
 308                 length = selinux_disable(fsi->state);
 309                 if (length)
 310                         goto out;
 311                 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 312                         "enforcing=%d old_enforcing=%d auid=%u ses=%u"
 313                         " enabled=0 old-enabled=1 lsm=selinux res=1",
 314                         enforcing, enforcing,
 315                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
 316                         audit_get_sessionid(current));
 317         }
 318
 319         length = count;
 320 out:
 321         kfree(page);
 322         return length;
 323 }
 324 #else
 325 #define sel_write_disable NULL
 326 #endif
 327
 328 static const struct file_operations sel_disable_ops = {
 329         .write          = sel_write_disable,
 330         .llseek         = generic_file_llseek,
 331 };
 332
 333 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 334                                    size_t count, loff_t *ppos)
 335 {
 336         char tmpbuf[TMPBUFLEN];
 337         ssize_t length;
 338
 339         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 340         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 341 }
 342
 343 static const struct file_operations sel_policyvers_ops = {
 344         .read           = sel_read_policyvers,
 345         .llseek         = generic_file_llseek,
 346 };
 347
 348 /* declaration for sel_write_load */
 349 static int sel_make_bools(struct selinux_fs_info *fsi);
 350 static int sel_make_classes(struct selinux_fs_info *fsi);
 351 static int sel_make_policycap(struct selinux_fs_info *fsi);
 352
 353 /* declaration for sel_make_class_dirs */
 354 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
 355                         unsigned long *ino);
 356
 357 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 358                                 size_t count, loff_t *ppos)
 359 {
 360         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 361         char tmpbuf[TMPBUFLEN];
 362         ssize_t length;
 363
 364         length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 365                            security_mls_enabled(fsi->state));
 366         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 367 }
 368
 369 static const struct file_operations sel_mls_ops = {
 370         .read           = sel_read_mls,
 371         .llseek         = generic_file_llseek,
 372 };
 373
 374 struct policy_load_memory {
 375         size_t len;
 376         void *data;
 377 };
 378
 379 static int sel_open_policy(struct inode *inode, struct file *filp)
 380 {
 381         struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
 382         struct selinux_state *state = fsi->state;
 383         struct policy_load_memory *plm = NULL;
 384         int rc;
 385
 386         BUG_ON(filp->private_data);
 387
 388         mutex_lock(&fsi->mutex);
 389
 390         rc = avc_has_perm(&selinux_state,
 391                           current_sid(), SECINITSID_SECURITY,
 392                           SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
 393         if (rc)
 394                 goto err;
 395
 396         rc = -EBUSY;
 397         if (fsi->policy_opened)
 398                 goto err;
 399
 400         rc = -ENOMEM;
 401         plm = kzalloc(sizeof(*plm), GFP_KERNEL);
 402         if (!plm)
 403                 goto err;
 404
 405         if (i_size_read(inode) != security_policydb_len(state)) {
 406                 inode_lock(inode);
 407                 i_size_write(inode, security_policydb_len(state));
 408                 inode_unlock(inode);
 409         }
 410
 411         rc = security_read_policy(state, &plm->data, &plm->len);
 412         if (rc)
 413                 goto err;
 414
 415         fsi->policy_opened = 1;
 416
 417         filp->private_data = plm;
 418
 419         mutex_unlock(&fsi->mutex);
 420
 421         return 0;
 422 err:
 423         mutex_unlock(&fsi->mutex);
 424
 425         if (plm)
 426                 vfree(plm->data);
 427         kfree(plm);
 428         return rc;
 429 }
 430
 431 static int sel_release_policy(struct inode *inode, struct file *filp)
 432 {
 433         struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
 434         struct policy_load_memory *plm = filp->private_data;
 435
 436         BUG_ON(!plm);
 437
 438         fsi->policy_opened = 0;
 439
 440         vfree(plm->data);
 441         kfree(plm);
 442
 443         return 0;
 444 }
 445
 446 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
 447                                size_t count, loff_t *ppos)
 448 {
 449         struct policy_load_memory *plm = filp->private_data;
 450         int ret;
 451
 452         ret = avc_has_perm(&selinux_state,
 453                            current_sid(), SECINITSID_SECURITY,
 454                           SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
 455         if (ret)
 456                 return ret;
 457
 458         return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
 459 }
 460
 461 static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
 462 {
 463         struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
 464         unsigned long offset;
 465         struct page *page;
 466
 467         if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
 468                 return VM_FAULT_SIGBUS;
 469
 470         offset = vmf->pgoff << PAGE_SHIFT;
 471         if (offset >= roundup(plm->len, PAGE_SIZE))
 472                 return VM_FAULT_SIGBUS;
 473
 474         page = vmalloc_to_page(plm->data + offset);
 475         get_page(page);
 476
 477         vmf->page = page;
 478
 479         return 0;
 480 }
 481
 482 static const struct vm_operations_struct sel_mmap_policy_ops = {
 483         .fault = sel_mmap_policy_fault,
 484         .page_mkwrite = sel_mmap_policy_fault,
 485 };
 486
 487 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
 488 {
 489         if (vma->vm_flags & VM_SHARED) {
 490                 /* do not allow mprotect to make mapping writable */
 491                 vma->vm_flags &= ~VM_MAYWRITE;
 492
 493                 if (vma->vm_flags & VM_WRITE)
 494                         return -EACCES;
 495         }
 496
 497         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 498         vma->vm_ops = &sel_mmap_policy_ops;
 499
 500         return 0;
 501 }
 502
 503 static const struct file_operations sel_policy_ops = {
 504         .open           = sel_open_policy,
 505         .read           = sel_read_policy,
 506         .mmap           = sel_mmap_policy,
 507         .release        = sel_release_policy,
 508         .llseek         = generic_file_llseek,
 509 };
 510
 511 static int sel_make_policy_nodes(struct selinux_fs_info *fsi)
 512 {
 513         int ret;
 514
 515         ret = sel_make_bools(fsi);
 516         if (ret) {
 517                 pr_err("SELinux: failed to load policy booleans\n");
 518                 return ret;
 519         }
 520
 521         ret = sel_make_classes(fsi);
 522         if (ret) {
 523                 pr_err("SELinux: failed to load policy classes\n");
 524                 return ret;
 525         }
 526
 527         ret = sel_make_policycap(fsi);
 528         if (ret) {
 529                 pr_err("SELinux: failed to load policy capabilities\n");
 530                 return ret;
 531         }
 532
 533         return 0;
 534 }
 535
 536 static ssize_t sel_write_load(struct file *file, const char __user *buf,
 537                               size_t count, loff_t *ppos)
 538
 539 {
 540         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 541         ssize_t length;
 542         void *data = NULL;
 543
 544         mutex_lock(&fsi->mutex);
 545
 546         length = avc_has_perm(&selinux_state,
 547                               current_sid(), SECINITSID_SECURITY,
 548                               SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
 549         if (length)
 550                 goto out;
 551
 552         /* No partial writes. */
 553         length = -EINVAL;
 554         if (*ppos != 0)
 555                 goto out;
 556
 557         length = -ENOMEM;
 558         data = vmalloc(count);
 559         if (!data)
 560                 goto out;
 561
 562         length = -EFAULT;
 563         if (copy_from_user(data, buf, count) != 0)
 564                 goto out;
 565
 566         length = security_load_policy(fsi->state, data, count);
 567         if (length) {
 568                 pr_warn_ratelimited("SELinux: failed to load policy\n");
 569                 goto out;
 570         }
 571
 572         length = sel_make_policy_nodes(fsi);
 573         if (length)
 574                 goto out1;
 575
 576         length = count;
 577
 578 out1:
 579         audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 580                 "auid=%u ses=%u lsm=selinux res=1",
 581                 from_kuid(&init_user_ns, audit_get_loginuid(current)),
 582                 audit_get_sessionid(current));
 583 out:
 584         mutex_unlock(&fsi->mutex);
 585         vfree(data);
 586         return length;
 587 }
 588
 589 static const struct file_operations sel_load_ops = {
 590         .write          = sel_write_load,
 591         .llseek         = generic_file_llseek,
 592 };
 593
 594 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 595 {
 596         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 597         struct selinux_state *state = fsi->state;
 598         char *canon = NULL;
 599         u32 sid, len;
 600         ssize_t length;
 601
 602         length = avc_has_perm(&selinux_state,
 603                               current_sid(), SECINITSID_SECURITY,
 604                               SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
 605         if (length)
 606                 goto out;
 607
 608         length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
 609         if (length)
 610                 goto out;
 611
 612         length = security_sid_to_context(state, sid, &canon, &len);
 613         if (length)
 614                 goto out;
 615
 616         length = -ERANGE;
 617         if (len > SIMPLE_TRANSACTION_LIMIT) {
 618                 pr_err("SELinux: %s:  context size (%u) exceeds "
 619                         "payload max\n", __func__, len);
 620                 goto out;
 621         }
 622
 623         memcpy(buf, canon, len);
 624         length = len;
 625 out:
 626         kfree(canon);
 627         return length;
 628 }
 629
 630 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 631                                      size_t count, loff_t *ppos)
 632 {
 633         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 634         char tmpbuf[TMPBUFLEN];
 635         ssize_t length;
 636
 637         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot);
 638         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 639 }
 640
 641 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 642                                       size_t count, loff_t *ppos)
 643 {
 644         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 645         char *page;
 646         ssize_t length;
 647         unsigned int new_value;
 648
 649         length = avc_has_perm(&selinux_state,
 650                               current_sid(), SECINITSID_SECURITY,
 651                               SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
 652                               NULL);
 653         if (length)
 654                 return length;
 655
 656         if (count >= PAGE_SIZE)
 657                 return -ENOMEM;
 658
 659         /* No partial writes. */
 660         if (*ppos != 0)
 661                 return -EINVAL;
 662
 663         page = memdup_user_nul(buf, count);
 664         if (IS_ERR(page))
 665                 return PTR_ERR(page);
 666
 667         length = -EINVAL;
 668         if (sscanf(page, "%u", &new_value) != 1)
 669                 goto out;
 670
 671         fsi->state->checkreqprot = new_value ? 1 : 0;
 672         length = count;
 673 out:
 674         kfree(page);
 675         return length;
 676 }
 677 static const struct file_operations sel_checkreqprot_ops = {
 678         .read           = sel_read_checkreqprot,
 679         .write          = sel_write_checkreqprot,
 680         .llseek         = generic_file_llseek,
 681 };
 682
 683 static ssize_t sel_write_validatetrans(struct file *file,
 684                                         const char __user *buf,
 685                                         size_t count, loff_t *ppos)
 686 {
 687         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 688         struct selinux_state *state = fsi->state;
 689         char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
 690         char *req = NULL;
 691         u32 osid, nsid, tsid;
 692         u16 tclass;
 693         int rc;
 694
 695         rc = avc_has_perm(&selinux_state,
 696                           current_sid(), SECINITSID_SECURITY,
 697                           SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
 698         if (rc)
 699                 goto out;
 700
 701         rc = -ENOMEM;
 702         if (count >= PAGE_SIZE)
 703                 goto out;
 704
 705         /* No partial writes. */
 706         rc = -EINVAL;
 707         if (*ppos != 0)
 708                 goto out;
 709
 710         req = memdup_user_nul(buf, count);
 711         if (IS_ERR(req)) {
 712                 rc = PTR_ERR(req);
 713                 req = NULL;
 714                 goto out;
 715         }
 716
 717         rc = -ENOMEM;
 718         oldcon = kzalloc(count + 1, GFP_KERNEL);
 719         if (!oldcon)
 720                 goto out;
 721
 722         newcon = kzalloc(count + 1, GFP_KERNEL);
 723         if (!newcon)
 724                 goto out;
 725
 726         taskcon = kzalloc(count + 1, GFP_KERNEL);
 727         if (!taskcon)
 728                 goto out;
 729
 730         rc = -EINVAL;
 731         if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
 732                 goto out;
 733
 734         rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
 735         if (rc)
 736                 goto out;
 737
 738         rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
 739         if (rc)
 740                 goto out;
 741
 742         rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
 743         if (rc)
 744                 goto out;
 745
 746         rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
 747         if (!rc)
 748                 rc = count;
 749 out:
 750         kfree(req);
 751         kfree(oldcon);
 752         kfree(newcon);
 753         kfree(taskcon);
 754         return rc;
 755 }
 756
 757 static const struct file_operations sel_transition_ops = {
 758         .write          = sel_write_validatetrans,
 759         .llseek         = generic_file_llseek,
 760 };
 761
 762 /*
 763  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 764  */
 765 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
 766 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
 767 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
 768 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
 769 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
 770
 771 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
 772         [SEL_ACCESS] = sel_write_access,
 773         [SEL_CREATE] = sel_write_create,
 774         [SEL_RELABEL] = sel_write_relabel,
 775         [SEL_USER] = sel_write_user,
 776         [SEL_MEMBER] = sel_write_member,
 777         [SEL_CONTEXT] = sel_write_context,
 778 };
 779
 780 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 781 {
 782         ino_t ino = file_inode(file)->i_ino;
 783         char *data;
 784         ssize_t rv;
 785
 786         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 787                 return -EINVAL;
 788
 789         data = simple_transaction_get(file, buf, size);
 790         if (IS_ERR(data))
 791                 return PTR_ERR(data);
 792
 793         rv = write_op[ino](file, data, size);
 794         if (rv > 0) {
 795                 simple_transaction_set(file, rv);
 796                 rv = size;
 797         }
 798         return rv;
 799 }
 800
 801 static const struct file_operations transaction_ops = {
 802         .write          = selinux_transaction_write,
 803         .read           = simple_transaction_read,
 804         .release        = simple_transaction_release,
 805         .llseek         = generic_file_llseek,
 806 };
 807
 808 /*
 809  * payload - write methods
 810  * If the method has a response, the response should be put in buf,
 811  * and the length returned.  Otherwise return 0 or and -error.
 812  */
 813
 814 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 815 {
 816         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 817         struct selinux_state *state = fsi->state;
 818         char *scon = NULL, *tcon = NULL;
 819         u32 ssid, tsid;
 820         u16 tclass;
 821         struct av_decision avd;
 822         ssize_t length;
 823
 824         length = avc_has_perm(&selinux_state,
 825                               current_sid(), SECINITSID_SECURITY,
 826                               SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
 827         if (length)
 828                 goto out;
 829
 830         length = -ENOMEM;
 831         scon = kzalloc(size + 1, GFP_KERNEL);
 832         if (!scon)
 833                 goto out;
 834
 835         length = -ENOMEM;
 836         tcon = kzalloc(size + 1, GFP_KERNEL);
 837         if (!tcon)
 838                 goto out;
 839
 840         length = -EINVAL;
 841         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 842                 goto out;
 843
 844         length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
 845         if (length)
 846                 goto out;
 847
 848         length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
 849         if (length)
 850                 goto out;
 851
 852         security_compute_av_user(state, ssid, tsid, tclass, &avd);
 853
 854         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 855                           "%x %x %x %x %u %x",
 856                           avd.allowed, 0xffffffff,
 857                           avd.auditallow, avd.auditdeny,
 858                           avd.seqno, avd.flags);
 859 out:
 860         kfree(tcon);
 861         kfree(scon);
 862         return length;
 863 }
 864
 865 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 866 {
 867         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 868         struct selinux_state *state = fsi->state;
 869         char *scon = NULL, *tcon = NULL;
 870         char *namebuf = NULL, *objname = NULL;
 871         u32 ssid, tsid, newsid;
 872         u16 tclass;
 873         ssize_t length;
 874         char *newcon = NULL;
 875         u32 len;
 876         int nargs;
 877
 878         length = avc_has_perm(&selinux_state,
 879                               current_sid(), SECINITSID_SECURITY,
 880                               SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
 881                               NULL);
 882         if (length)
 883                 goto out;
 884
 885         length = -ENOMEM;
 886         scon = kzalloc(size + 1, GFP_KERNEL);
 887         if (!scon)
 888                 goto out;
 889
 890         length = -ENOMEM;
 891         tcon = kzalloc(size + 1, GFP_KERNEL);
 892         if (!tcon)
 893                 goto out;
 894
 895         length = -ENOMEM;
 896         namebuf = kzalloc(size + 1, GFP_KERNEL);
 897         if (!namebuf)
 898                 goto out;
 899
 900         length = -EINVAL;
 901         nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
 902         if (nargs < 3 || nargs > 4)
 903                 goto out;
 904         if (nargs == 4) {
 905                 /*
 906                  * If and when the name of new object to be queried contains
 907                  * either whitespace or multibyte characters, they shall be
 908                  * encoded based on the percentage-encoding rule.
 909                  * If not encoded, the sscanf logic picks up only left-half
 910                  * of the supplied name; splitted by a whitespace unexpectedly.
 911                  */
 912                 char   *r, *w;
 913                 int     c1, c2;
 914
 915                 r = w = namebuf;
 916                 do {
 917                         c1 = *r++;
 918                         if (c1 == '+')
 919                                 c1 = ' ';
 920                         else if (c1 == '%') {
 921                                 c1 = hex_to_bin(*r++);
 922                                 if (c1 < 0)
 923                                         goto out;
 924                                 c2 = hex_to_bin(*r++);
 925                                 if (c2 < 0)
 926                                         goto out;
 927                                 c1 = (c1 << 4) | c2;
 928                         }
 929                         *w++ = c1;
 930                 } while (c1 != '\0');
 931
 932                 objname = namebuf;
 933         }
 934
 935         length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
 936         if (length)
 937                 goto out;
 938
 939         length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
 940         if (length)
 941                 goto out;
 942
 943         length = security_transition_sid_user(state, ssid, tsid, tclass,
 944                                               objname, &newsid);
 945         if (length)
 946                 goto out;
 947
 948         length = security_sid_to_context(state, newsid, &newcon, &len);
 949         if (length)
 950                 goto out;
 951
 952         length = -ERANGE;
 953         if (len > SIMPLE_TRANSACTION_LIMIT) {
 954                 pr_err("SELinux: %s:  context size (%u) exceeds "
 955                         "payload max\n", __func__, len);
 956                 goto out;
 957         }
 958
 959         memcpy(buf, newcon, len);
 960         length = len;
 961 out:
 962         kfree(newcon);
 963         kfree(namebuf);
 964         kfree(tcon);
 965         kfree(scon);
 966         return length;
 967 }
 968
 969 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
 970 {
 971         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 972         struct selinux_state *state = fsi->state;
 973         char *scon = NULL, *tcon = NULL;
 974         u32 ssid, tsid, newsid;
 975         u16 tclass;
 976         ssize_t length;
 977         char *newcon = NULL;
 978         u32 len;
 979
 980         length = avc_has_perm(&selinux_state,
 981                               current_sid(), SECINITSID_SECURITY,
 982                               SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
 983                               NULL);
 984         if (length)
 985                 goto out;
 986
 987         length = -ENOMEM;
 988         scon = kzalloc(size + 1, GFP_KERNEL);
 989         if (!scon)
 990                 goto out;
 991
 992         length = -ENOMEM;
 993         tcon = kzalloc(size + 1, GFP_KERNEL);
 994         if (!tcon)
 995                 goto out;
 996
 997         length = -EINVAL;
 998         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 999                 goto out;
1000
1001         length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1002         if (length)
1003                 goto out;
1004
1005         length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1006         if (length)
1007                 goto out;
1008
1009         length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1010         if (length)
1011                 goto out;
1012
1013         length = security_sid_to_context(state, newsid, &newcon, &len);
1014         if (length)
1015                 goto out;
1016
1017         length = -ERANGE;
1018         if (len > SIMPLE_TRANSACTION_LIMIT)
1019                 goto out;
1020
1021         memcpy(buf, newcon, len);
1022         length = len;
1023 out:
1024         kfree(newcon);
1025         kfree(tcon);
1026         kfree(scon);
1027         return length;
1028 }
1029
1030 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1031 {
1032         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1033         struct selinux_state *state = fsi->state;
1034         char *con = NULL, *user = NULL, *ptr;
1035         u32 sid, *sids = NULL;
1036         ssize_t length;
1037         char *newcon;
1038         int i, rc;
1039         u32 len, nsids;
1040
1041         length = avc_has_perm(&selinux_state,
1042                               current_sid(), SECINITSID_SECURITY,
1043                               SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1044                               NULL);
1045         if (length)
1046                 goto out;
1047
1048         length = -ENOMEM;
1049         con = kzalloc(size + 1, GFP_KERNEL);
1050         if (!con)
1051                 goto out;
1052
1053         length = -ENOMEM;
1054         user = kzalloc(size + 1, GFP_KERNEL);
1055         if (!user)
1056                 goto out;
1057
1058         length = -EINVAL;
1059         if (sscanf(buf, "%s %s", con, user) != 2)
1060                 goto out;
1061
1062         length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1063         if (length)
1064                 goto out;
1065
1066         length = security_get_user_sids(state, sid, user, &sids, &nsids);
1067         if (length)
1068                 goto out;
1069
1070         length = sprintf(buf, "%u", nsids) + 1;
1071         ptr = buf + length;
1072         for (i = 0; i < nsids; i++) {
1073                 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1074                 if (rc) {
1075                         length = rc;
1076                         goto out;
1077                 }
1078                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1079                         kfree(newcon);
1080                         length = -ERANGE;
1081                         goto out;
1082                 }
1083                 memcpy(ptr, newcon, len);
1084                 kfree(newcon);
1085                 ptr += len;
1086                 length += len;
1087         }
1088 out:
1089         kfree(sids);
1090         kfree(user);
1091         kfree(con);
1092         return length;
1093 }
1094
1095 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1096 {
1097         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1098         struct selinux_state *state = fsi->state;
1099         char *scon = NULL, *tcon = NULL;
1100         u32 ssid, tsid, newsid;
1101         u16 tclass;
1102         ssize_t length;
1103         char *newcon = NULL;
1104         u32 len;
1105
1106         length = avc_has_perm(&selinux_state,
1107                               current_sid(), SECINITSID_SECURITY,
1108                               SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1109                               NULL);
1110         if (length)
1111                 goto out;
1112
1113         length = -ENOMEM;
1114         scon = kzalloc(size + 1, GFP_KERNEL);
1115         if (!scon)
1116                 goto out;
1117
1118         length = -ENOMEM;
1119         tcon = kzalloc(size + 1, GFP_KERNEL);
1120         if (!tcon)
1121                 goto out;
1122
1123         length = -EINVAL;
1124         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1125                 goto out;
1126
1127         length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1128         if (length)
1129                 goto out;
1130
1131         length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1132         if (length)
1133                 goto out;
1134
1135         length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1136         if (length)
1137                 goto out;
1138
1139         length = security_sid_to_context(state, newsid, &newcon, &len);
1140         if (length)
1141                 goto out;
1142
1143         length = -ERANGE;
1144         if (len > SIMPLE_TRANSACTION_LIMIT) {
1145                 pr_err("SELinux: %s:  context size (%u) exceeds "
1146                         "payload max\n", __func__, len);
1147                 goto out;
1148         }
1149
1150         memcpy(buf, newcon, len);
1151         length = len;
1152 out:
1153         kfree(newcon);
1154         kfree(tcon);
1155         kfree(scon);
1156         return length;
1157 }
1158
1159 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1160 {
1161         struct inode *ret = new_inode(sb);
1162
1163         if (ret) {
1164                 ret->i_mode = mode;
1165                 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1166         }
1167         return ret;
1168 }
1169
1170 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1171                              size_t count, loff_t *ppos)
1172 {
1173         struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1174         char *page = NULL;
1175         ssize_t length;
1176         ssize_t ret;
1177         int cur_enforcing;
1178         unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1179         const char *name = filep->f_path.dentry->d_name.name;
1180
1181         mutex_lock(&fsi->mutex);
1182
1183         ret = -EINVAL;
1184         if (index >= fsi->bool_num || strcmp(name,
1185                                              fsi->bool_pending_names[index]))
1186                 goto out_unlock;
1187
1188         ret = -ENOMEM;
1189         page = (char *)get_zeroed_page(GFP_KERNEL);
1190         if (!page)
1191                 goto out_unlock;
1192
1193         cur_enforcing = security_get_bool_value(fsi->state, index);
1194         if (cur_enforcing < 0) {
1195                 ret = cur_enforcing;
1196                 goto out_unlock;
1197         }
1198         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1199                           fsi->bool_pending_values[index]);
1200         mutex_unlock(&fsi->mutex);
1201         ret = simple_read_from_buffer(buf, count, ppos, page, length);
1202 out_free:
1203         free_page((unsigned long)page);
1204         return ret;
1205
1206 out_unlock:
1207         mutex_unlock(&fsi->mutex);
1208         goto out_free;
1209 }
1210
1211 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1212                               size_t count, loff_t *ppos)
1213 {
1214         struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1215         char *page = NULL;
1216         ssize_t length;
1217         int new_value;
1218         unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1219         const char *name = filep->f_path.dentry->d_name.name;
1220
1221         if (count >= PAGE_SIZE)
1222                 return -ENOMEM;
1223
1224         /* No partial writes. */
1225         if (*ppos != 0)
1226                 return -EINVAL;
1227
1228         page = memdup_user_nul(buf, count);
1229         if (IS_ERR(page))
1230                 return PTR_ERR(page);
1231
1232         mutex_lock(&fsi->mutex);
1233
1234         length = avc_has_perm(&selinux_state,
1235                               current_sid(), SECINITSID_SECURITY,
1236                               SECCLASS_SECURITY, SECURITY__SETBOOL,
1237                               NULL);
1238         if (length)
1239                 goto out;
1240
1241         length = -EINVAL;
1242         if (index >= fsi->bool_num || strcmp(name,
1243                                              fsi->bool_pending_names[index]))
1244                 goto out;
1245
1246         length = -EINVAL;
1247         if (sscanf(page, "%d", &new_value) != 1)
1248                 goto out;
1249
1250         if (new_value)
1251                 new_value = 1;
1252
1253         fsi->bool_pending_values[index] = new_value;
1254         length = count;
1255
1256 out:
1257         mutex_unlock(&fsi->mutex);
1258         kfree(page);
1259         return length;
1260 }
1261
1262 static const struct file_operations sel_bool_ops = {
1263         .read           = sel_read_bool,
1264         .write          = sel_write_bool,
1265         .llseek         = generic_file_llseek,
1266 };
1267
1268 static ssize_t sel_commit_bools_write(struct file *filep,
1269                                       const char __user *buf,
1270                                       size_t count, loff_t *ppos)
1271 {
1272         struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1273         char *page = NULL;
1274         ssize_t length;
1275         int new_value;
1276
1277         if (count >= PAGE_SIZE)
1278                 return -ENOMEM;
1279
1280         /* No partial writes. */
1281         if (*ppos != 0)
1282                 return -EINVAL;
1283
1284         page = memdup_user_nul(buf, count);
1285         if (IS_ERR(page))
1286                 return PTR_ERR(page);
1287
1288         mutex_lock(&fsi->mutex);
1289
1290         length = avc_has_perm(&selinux_state,
1291                               current_sid(), SECINITSID_SECURITY,
1292                               SECCLASS_SECURITY, SECURITY__SETBOOL,
1293                               NULL);
1294         if (length)
1295                 goto out;
1296
1297         length = -EINVAL;
1298         if (sscanf(page, "%d", &new_value) != 1)
1299                 goto out;
1300
1301         length = 0;
1302         if (new_value && fsi->bool_pending_values)
1303                 length = security_set_bools(fsi->state, fsi->bool_num,
1304                                             fsi->bool_pending_values);
1305
1306         if (!length)
1307                 length = count;
1308
1309 out:
1310         mutex_unlock(&fsi->mutex);
1311         kfree(page);
1312         return length;
1313 }
1314
1315 static const struct file_operations sel_commit_bools_ops = {
1316         .write          = sel_commit_bools_write,
1317         .llseek         = generic_file_llseek,
1318 };
1319
1320 static void sel_remove_entries(struct dentry *de)
1321 {
1322         d_genocide(de);
1323         shrink_dcache_parent(de);
1324 }
1325
1326 #define BOOL_DIR_NAME "booleans"
1327
1328 static int sel_make_bools(struct selinux_fs_info *fsi)
1329 {
1330         int i, ret;
1331         ssize_t len;
1332         struct dentry *dentry = NULL;
1333         struct dentry *dir = fsi->bool_dir;
1334         struct inode *inode = NULL;
1335         struct inode_security_struct *isec;
1336         char **names = NULL, *page;
1337         int num;
1338         int *values = NULL;
1339         u32 sid;
1340
1341         /* remove any existing files */
1342         for (i = 0; i < fsi->bool_num; i++)
1343                 kfree(fsi->bool_pending_names[i]);
1344         kfree(fsi->bool_pending_names);
1345         kfree(fsi->bool_pending_values);
1346         fsi->bool_num = 0;
1347         fsi->bool_pending_names = NULL;
1348         fsi->bool_pending_values = NULL;
1349
1350         sel_remove_entries(dir);
1351
1352         ret = -ENOMEM;
1353         page = (char *)get_zeroed_page(GFP_KERNEL);
1354         if (!page)
1355                 goto out;
1356
1357         ret = security_get_bools(fsi->state, &num, &names, &values);
1358         if (ret)
1359                 goto out;
1360
1361         for (i = 0; i < num; i++) {
1362                 ret = -ENOMEM;
1363                 dentry = d_alloc_name(dir, names[i]);
1364                 if (!dentry)
1365                         goto out;
1366
1367                 ret = -ENOMEM;
1368                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1369                 if (!inode) {
1370                         dput(dentry);
1371                         goto out;
1372                 }
1373
1374                 ret = -ENAMETOOLONG;
1375                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1376                 if (len >= PAGE_SIZE) {
1377                         dput(dentry);
1378                         iput(inode);
1379                         goto out;
1380                 }
1381
1382                 isec = selinux_inode(inode);
1383                 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1384                                          SECCLASS_FILE, &sid);
1385                 if (ret) {
1386                         pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1387                                            page);
1388                         sid = SECINITSID_SECURITY;
1389                 }
1390
1391                 isec->sid = sid;
1392                 isec->initialized = LABEL_INITIALIZED;
1393                 inode->i_fop = &sel_bool_ops;
1394                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1395                 d_add(dentry, inode);
1396         }
1397         fsi->bool_num = num;
1398         fsi->bool_pending_names = names;
1399         fsi->bool_pending_values = values;
1400
1401         free_page((unsigned long)page);
1402         return 0;
1403 out:
1404         free_page((unsigned long)page);
1405
1406         if (names) {
1407                 for (i = 0; i < num; i++)
1408                         kfree(names[i]);
1409                 kfree(names);
1410         }
1411         kfree(values);
1412         sel_remove_entries(dir);
1413
1414         return ret;
1415 }
1416
1417 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1418                                             size_t count, loff_t *ppos)
1419 {
1420         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1421         struct selinux_state *state = fsi->state;
1422         char tmpbuf[TMPBUFLEN];
1423         ssize_t length;
1424
1425         length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1426                            avc_get_cache_threshold(state->avc));
1427         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1428 }
1429
1430 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1431                                              const char __user *buf,
1432                                              size_t count, loff_t *ppos)
1433
1434 {
1435         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1436         struct selinux_state *state = fsi->state;
1437         char *page;
1438         ssize_t ret;
1439         unsigned int new_value;
1440
1441         ret = avc_has_perm(&selinux_state,
1442                            current_sid(), SECINITSID_SECURITY,
1443                            SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1444                            NULL);
1445         if (ret)
1446                 return ret;
1447
1448         if (count >= PAGE_SIZE)
1449                 return -ENOMEM;
1450
1451         /* No partial writes. */
1452         if (*ppos != 0)
1453                 return -EINVAL;
1454
1455         page = memdup_user_nul(buf, count);
1456         if (IS_ERR(page))
1457                 return PTR_ERR(page);
1458
1459         ret = -EINVAL;
1460         if (sscanf(page, "%u", &new_value) != 1)
1461                 goto out;
1462
1463         avc_set_cache_threshold(state->avc, new_value);
1464
1465         ret = count;
1466 out:
1467         kfree(page);
1468         return ret;
1469 }
1470
1471 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1472                                        size_t count, loff_t *ppos)
1473 {
1474         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1475         struct selinux_state *state = fsi->state;
1476         char *page;
1477         ssize_t length;
1478
1479         page = (char *)__get_free_page(GFP_KERNEL);
1480         if (!page)
1481                 return -ENOMEM;
1482
1483         length = avc_get_hash_stats(state->avc, page);
1484         if (length >= 0)
1485                 length = simple_read_from_buffer(buf, count, ppos, page, length);
1486         free_page((unsigned long)page);
1487
1488         return length;
1489 }
1490
1491 static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1492                                         size_t count, loff_t *ppos)
1493 {
1494         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1495         struct selinux_state *state = fsi->state;
1496         char *page;
1497         ssize_t length;
1498
1499         page = (char *)__get_free_page(GFP_KERNEL);
1500         if (!page)
1501                 return -ENOMEM;
1502
1503         length = security_sidtab_hash_stats(state, page);
1504         if (length >= 0)
1505                 length = simple_read_from_buffer(buf, count, ppos, page,
1506                                                 length);
1507         free_page((unsigned long)page);
1508
1509         return length;
1510 }
1511
1512 static const struct file_operations sel_sidtab_hash_stats_ops = {
1513         .read           = sel_read_sidtab_hash_stats,
1514         .llseek         = generic_file_llseek,
1515 };
1516
1517 static const struct file_operations sel_avc_cache_threshold_ops = {
1518         .read           = sel_read_avc_cache_threshold,
1519         .write          = sel_write_avc_cache_threshold,
1520         .llseek         = generic_file_llseek,
1521 };
1522
1523 static const struct file_operations sel_avc_hash_stats_ops = {
1524         .read           = sel_read_avc_hash_stats,
1525         .llseek         = generic_file_llseek,
1526 };
1527
1528 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1529 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1530 {
1531         int cpu;
1532
1533         for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1534                 if (!cpu_possible(cpu))
1535                         continue;
1536                 *idx = cpu + 1;
1537                 return &per_cpu(avc_cache_stats, cpu);
1538         }
1539         return NULL;
1540 }
1541
1542 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1543 {
1544         loff_t n = *pos - 1;
1545
1546         if (*pos == 0)
1547                 return SEQ_START_TOKEN;
1548
1549         return sel_avc_get_stat_idx(&n);
1550 }
1551
1552 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1553 {
1554         return sel_avc_get_stat_idx(pos);
1555 }
1556
1557 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1558 {
1559         struct avc_cache_stats *st = v;
1560
1561         if (v == SEQ_START_TOKEN) {
1562                 seq_puts(seq,
1563                          "lookups hits misses allocations reclaims frees\n");
1564         } else {
1565                 unsigned int lookups = st->lookups;
1566                 unsigned int misses = st->misses;
1567                 unsigned int hits = lookups - misses;
1568                 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1569                            hits, misses, st->allocations,
1570                            st->reclaims, st->frees);
1571         }
1572         return 0;
1573 }
1574
1575 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1576 { }
1577
1578 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1579         .start          = sel_avc_stats_seq_start,
1580         .next           = sel_avc_stats_seq_next,
1581         .show           = sel_avc_stats_seq_show,
1582         .stop           = sel_avc_stats_seq_stop,
1583 };
1584
1585 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1586 {
1587         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1588 }
1589
1590 static const struct file_operations sel_avc_cache_stats_ops = {
1591         .open           = sel_open_avc_cache_stats,
1592         .read           = seq_read,
1593         .llseek         = seq_lseek,
1594         .release        = seq_release,
1595 };
1596 #endif
1597
1598 static int sel_make_avc_files(struct dentry *dir)
1599 {
1600         struct super_block *sb = dir->d_sb;
1601         struct selinux_fs_info *fsi = sb->s_fs_info;
1602         int i;
1603         static const struct tree_descr files[] = {
1604                 { "cache_threshold",
1605                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1606                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1607 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1608                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1609 #endif
1610         };
1611
1612         for (i = 0; i < ARRAY_SIZE(files); i++) {
1613                 struct inode *inode;
1614                 struct dentry *dentry;
1615
1616                 dentry = d_alloc_name(dir, files[i].name);
1617                 if (!dentry)
1618                         return -ENOMEM;
1619
1620                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1621                 if (!inode) {
1622                         dput(dentry);
1623                         return -ENOMEM;
1624                 }
1625
1626                 inode->i_fop = files[i].ops;
1627                 inode->i_ino = ++fsi->last_ino;
1628                 d_add(dentry, inode);
1629         }
1630
1631         return 0;
1632 }
1633
1634 static int sel_make_ss_files(struct dentry *dir)
1635 {
1636         struct super_block *sb = dir->d_sb;
1637         struct selinux_fs_info *fsi = sb->s_fs_info;
1638         int i;
1639         static struct tree_descr files[] = {
1640                 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1641         };
1642
1643         for (i = 0; i < ARRAY_SIZE(files); i++) {
1644                 struct inode *inode;
1645                 struct dentry *dentry;
1646
1647                 dentry = d_alloc_name(dir, files[i].name);
1648                 if (!dentry)
1649                         return -ENOMEM;
1650
1651                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1652                 if (!inode) {
1653                         dput(dentry);
1654                         return -ENOMEM;
1655                 }
1656
1657                 inode->i_fop = files[i].ops;
1658                 inode->i_ino = ++fsi->last_ino;
1659                 d_add(dentry, inode);
1660         }
1661
1662         return 0;
1663 }
1664
1665 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1666                                 size_t count, loff_t *ppos)
1667 {
1668         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1669         char *con;
1670         u32 sid, len;
1671         ssize_t ret;
1672
1673         sid = file_inode(file)->i_ino&SEL_INO_MASK;
1674         ret = security_sid_to_context(fsi->state, sid, &con, &len);
1675         if (ret)
1676                 return ret;
1677
1678         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1679         kfree(con);
1680         return ret;
1681 }
1682
1683 static const struct file_operations sel_initcon_ops = {
1684         .read           = sel_read_initcon,
1685         .llseek         = generic_file_llseek,
1686 };
1687
1688 static int sel_make_initcon_files(struct dentry *dir)
1689 {
1690         int i;
1691
1692         for (i = 1; i <= SECINITSID_NUM; i++) {
1693                 struct inode *inode;
1694                 struct dentry *dentry;
1695                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1696                 if (!dentry)
1697                         return -ENOMEM;
1698
1699                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1700                 if (!inode) {
1701                         dput(dentry);
1702                         return -ENOMEM;
1703                 }
1704
1705                 inode->i_fop = &sel_initcon_ops;
1706                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1707                 d_add(dentry, inode);
1708         }
1709
1710         return 0;
1711 }
1712
1713 static inline unsigned long sel_class_to_ino(u16 class)
1714 {
1715         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1716 }
1717
1718 static inline u16 sel_ino_to_class(unsigned long ino)
1719 {
1720         return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1721 }
1722
1723 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1724 {
1725         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1726 }
1727
1728 static inline u32 sel_ino_to_perm(unsigned long ino)
1729 {
1730         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1731 }
1732
1733 static ssize_t sel_read_class(struct file *file, char __user *buf,
1734                                 size_t count, loff_t *ppos)
1735 {
1736         unsigned long ino = file_inode(file)->i_ino;
1737         char res[TMPBUFLEN];
1738         ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1739         return simple_read_from_buffer(buf, count, ppos, res, len);
1740 }
1741
1742 static const struct file_operations sel_class_ops = {
1743         .read           = sel_read_class,
1744         .llseek         = generic_file_llseek,
1745 };
1746
1747 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1748                                 size_t count, loff_t *ppos)
1749 {
1750         unsigned long ino = file_inode(file)->i_ino;
1751         char res[TMPBUFLEN];
1752         ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1753         return simple_read_from_buffer(buf, count, ppos, res, len);
1754 }
1755
1756 static const struct file_operations sel_perm_ops = {
1757         .read           = sel_read_perm,
1758         .llseek         = generic_file_llseek,
1759 };
1760
1761 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1762                                   size_t count, loff_t *ppos)
1763 {
1764         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1765         int value;
1766         char tmpbuf[TMPBUFLEN];
1767         ssize_t length;
1768         unsigned long i_ino = file_inode(file)->i_ino;
1769
1770         value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1771         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1772
1773         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1774 }
1775
1776 static const struct file_operations sel_policycap_ops = {
1777         .read           = sel_read_policycap,
1778         .llseek         = generic_file_llseek,
1779 };
1780
1781 static int sel_make_perm_files(char *objclass, int classvalue,
1782                                 struct dentry *dir)
1783 {
1784         struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1785         int i, rc, nperms;
1786         char **perms;
1787
1788         rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1789         if (rc)
1790                 return rc;
1791
1792         for (i = 0; i < nperms; i++) {
1793                 struct inode *inode;
1794                 struct dentry *dentry;
1795
1796                 rc = -ENOMEM;
1797                 dentry = d_alloc_name(dir, perms[i]);
1798                 if (!dentry)
1799                         goto out;
1800
1801                 rc = -ENOMEM;
1802                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1803                 if (!inode) {
1804                         dput(dentry);
1805                         goto out;
1806                 }
1807
1808                 inode->i_fop = &sel_perm_ops;
1809                 /* i+1 since perm values are 1-indexed */
1810                 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1811                 d_add(dentry, inode);
1812         }
1813         rc = 0;
1814 out:
1815         for (i = 0; i < nperms; i++)
1816                 kfree(perms[i]);
1817         kfree(perms);
1818         return rc;
1819 }
1820
1821 static int sel_make_class_dir_entries(char *classname, int index,
1822                                         struct dentry *dir)
1823 {
1824         struct super_block *sb = dir->d_sb;
1825         struct selinux_fs_info *fsi = sb->s_fs_info;
1826         struct dentry *dentry = NULL;
1827         struct inode *inode = NULL;
1828         int rc;
1829
1830         dentry = d_alloc_name(dir, "index");
1831         if (!dentry)
1832                 return -ENOMEM;
1833
1834         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1835         if (!inode) {
1836                 dput(dentry);
1837                 return -ENOMEM;
1838         }
1839
1840         inode->i_fop = &sel_class_ops;
1841         inode->i_ino = sel_class_to_ino(index);
1842         d_add(dentry, inode);
1843
1844         dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1845         if (IS_ERR(dentry))
1846                 return PTR_ERR(dentry);
1847
1848         rc = sel_make_perm_files(classname, index, dentry);
1849
1850         return rc;
1851 }
1852
1853 static int sel_make_classes(struct selinux_fs_info *fsi)
1854 {
1855
1856         int rc, nclasses, i;
1857         char **classes;
1858
1859         /* delete any existing entries */
1860         sel_remove_entries(fsi->class_dir);
1861
1862         rc = security_get_classes(fsi->state, &classes, &nclasses);
1863         if (rc)
1864                 return rc;
1865
1866         /* +2 since classes are 1-indexed */
1867         fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1868
1869         for (i = 0; i < nclasses; i++) {
1870                 struct dentry *class_name_dir;
1871
1872                 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1873                                               &fsi->last_class_ino);
1874                 if (IS_ERR(class_name_dir)) {
1875                         rc = PTR_ERR(class_name_dir);
1876                         goto out;
1877                 }
1878
1879                 /* i+1 since class values are 1-indexed */
1880                 rc = sel_make_class_dir_entries(classes[i], i + 1,
1881                                 class_name_dir);
1882                 if (rc)
1883                         goto out;
1884         }
1885         rc = 0;
1886 out:
1887         for (i = 0; i < nclasses; i++)
1888                 kfree(classes[i]);
1889         kfree(classes);
1890         return rc;
1891 }
1892
1893 static int sel_make_policycap(struct selinux_fs_info *fsi)
1894 {
1895         unsigned int iter;
1896         struct dentry *dentry = NULL;
1897         struct inode *inode = NULL;
1898
1899         sel_remove_entries(fsi->policycap_dir);
1900
1901         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1902                 if (iter < ARRAY_SIZE(selinux_policycap_names))
1903                         dentry = d_alloc_name(fsi->policycap_dir,
1904                                               selinux_policycap_names[iter]);
1905                 else
1906                         dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1907
1908                 if (dentry == NULL)
1909                         return -ENOMEM;
1910
1911                 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1912                 if (inode == NULL) {
1913                         dput(dentry);
1914                         return -ENOMEM;
1915                 }
1916
1917                 inode->i_fop = &sel_policycap_ops;
1918                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1919                 d_add(dentry, inode);
1920         }
1921
1922         return 0;
1923 }
1924
1925 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1926                         unsigned long *ino)
1927 {
1928         struct dentry *dentry = d_alloc_name(dir, name);
1929         struct inode *inode;
1930
1931         if (!dentry)
1932                 return ERR_PTR(-ENOMEM);
1933
1934         inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1935         if (!inode) {
1936                 dput(dentry);
1937                 return ERR_PTR(-ENOMEM);
1938         }
1939
1940         inode->i_op = &simple_dir_inode_operations;
1941         inode->i_fop = &simple_dir_operations;
1942         inode->i_ino = ++(*ino);
1943         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1944         inc_nlink(inode);
1945         d_add(dentry, inode);
1946         /* bump link count on parent directory, too */
1947         inc_nlink(d_inode(dir));
1948
1949         return dentry;
1950 }
1951
1952 #define NULL_FILE_NAME "null"
1953
1954 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1955 {
1956         struct selinux_fs_info *fsi;
1957         int ret;
1958         struct dentry *dentry;
1959         struct inode *inode;
1960         struct inode_security_struct *isec;
1961
1962         static const struct tree_descr selinux_files[] = {
1963                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1964                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1965                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1966                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1967                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1968                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1969                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1970                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1971                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1972                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1973                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1974                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1975                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1976                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1977                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1978                 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1979                 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1980                 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1981                                         S_IWUGO},
1982                 /* last one */ {""}
1983         };
1984
1985         ret = selinux_fs_info_create(sb);
1986         if (ret)
1987                 goto err;
1988
1989         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1990         if (ret)
1991                 goto err;
1992
1993         fsi = sb->s_fs_info;
1994         fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
1995         if (IS_ERR(fsi->bool_dir)) {
1996                 ret = PTR_ERR(fsi->bool_dir);
1997                 fsi->bool_dir = NULL;
1998                 goto err;
1999         }
2000
2001         ret = -ENOMEM;
2002         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2003         if (!dentry)
2004                 goto err;
2005
2006         ret = -ENOMEM;
2007         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2008         if (!inode) {
2009                 dput(dentry);
2010                 goto err;
2011         }
2012
2013         inode->i_ino = ++fsi->last_ino;
2014         isec = selinux_inode(inode);
2015         isec->sid = SECINITSID_DEVNULL;
2016         isec->sclass = SECCLASS_CHR_FILE;
2017         isec->initialized = LABEL_INITIALIZED;
2018
2019         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2020         d_add(dentry, inode);
2021
2022         dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2023         if (IS_ERR(dentry)) {
2024                 ret = PTR_ERR(dentry);
2025                 goto err;
2026         }
2027
2028         ret = sel_make_avc_files(dentry);
2029
2030         dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2031         if (IS_ERR(dentry)) {
2032                 ret = PTR_ERR(dentry);
2033                 goto err;
2034         }
2035
2036         ret = sel_make_ss_files(dentry);
2037         if (ret)
2038                 goto err;
2039
2040         dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2041         if (IS_ERR(dentry)) {
2042                 ret = PTR_ERR(dentry);
2043                 goto err;
2044         }
2045
2046         ret = sel_make_initcon_files(dentry);
2047         if (ret)
2048                 goto err;
2049
2050         fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
2051         if (IS_ERR(fsi->class_dir)) {
2052                 ret = PTR_ERR(fsi->class_dir);
2053                 fsi->class_dir = NULL;
2054                 goto err;
2055         }
2056
2057         fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
2058                                           &fsi->last_ino);
2059         if (IS_ERR(fsi->policycap_dir)) {
2060                 ret = PTR_ERR(fsi->policycap_dir);
2061                 fsi->policycap_dir = NULL;
2062                 goto err;
2063         }
2064
2065         ret = sel_make_policy_nodes(fsi);
2066         if (ret)
2067                 goto err;
2068         return 0;
2069 err:
2070         pr_err("SELinux: %s:  failed while creating inodes\n",
2071                 __func__);
2072
2073         selinux_fs_info_free(sb);
2074
2075         return ret;
2076 }
2077
2078 static int sel_get_tree(struct fs_context *fc)
2079 {
2080         return get_tree_single(fc, sel_fill_super);
2081 }
2082
2083 static const struct fs_context_operations sel_context_ops = {
2084         .get_tree       = sel_get_tree,
2085 };
2086
2087 static int sel_init_fs_context(struct fs_context *fc)
2088 {
2089         fc->ops = &sel_context_ops;
2090         return 0;
2091 }
2092
2093 static void sel_kill_sb(struct super_block *sb)
2094 {
2095         selinux_fs_info_free(sb);
2096         kill_litter_super(sb);
2097 }
2098
2099 static struct file_system_type sel_fs_type = {
2100         .name           = "selinuxfs",
2101         .init_fs_context = sel_init_fs_context,
2102         .kill_sb        = sel_kill_sb,
2103 };
2104
2105 struct vfsmount *selinuxfs_mount;
2106 struct path selinux_null;
2107
2108 static int __init init_sel_fs(void)
2109 {
2110         struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2111                                           sizeof(NULL_FILE_NAME)-1);
2112         int err;
2113
2114         if (!selinux_enabled_boot)
2115                 return 0;
2116
2117         err = sysfs_create_mount_point(fs_kobj, "selinux");
2118         if (err)
2119                 return err;
2120
2121         err = register_filesystem(&sel_fs_type);
2122         if (err) {
2123                 sysfs_remove_mount_point(fs_kobj, "selinux");
2124                 return err;
2125         }
2126
2127         selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2128         if (IS_ERR(selinuxfs_mount)) {
2129                 pr_err("selinuxfs:  could not mount!\n");
2130                 err = PTR_ERR(selinuxfs_mount);
2131                 selinuxfs_mount = NULL;
2132         }
2133         selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2134                                                 &null_name);
2135         if (IS_ERR(selinux_null.dentry)) {
2136                 pr_err("selinuxfs:  could not lookup null!\n");
2137                 err = PTR_ERR(selinux_null.dentry);
2138                 selinux_null.dentry = NULL;
2139         }
2140
2141         return err;
2142 }
2143
2144 __initcall(init_sel_fs);
2145
2146 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2147 void exit_sel_fs(void)
2148 {
2149         sysfs_remove_mount_point(fs_kobj, "selinux");
2150         dput(selinux_null.dentry);
2151         kern_unmount(selinuxfs_mount);
2152         unregister_filesystem(&sel_fs_type);
2153 }
2154 #endif