security/tomoyo/common.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * security/tomoyo/common.c
   4  *
   5  * Copyright (C) 2005-2011  NTT DATA CORPORATION
   6  */
   7
   8 #include <linux/uaccess.h>
   9 #include <linux/slab.h>
  10 #include <linux/security.h>
  11 #include <linux/string_helpers.h>
  12 #include "common.h"
  13
  14 /* String table for operation mode. */
  15 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
  16         [TOMOYO_CONFIG_DISABLED]   = "disabled",
  17         [TOMOYO_CONFIG_LEARNING]   = "learning",
  18         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
  19         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
  20 };
  21
  22 /* String table for /sys/kernel/security/tomoyo/profile */
  23 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
  24                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
  25         /* CONFIG::file group */
  26         [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
  27         [TOMOYO_MAC_FILE_OPEN]       = "open",
  28         [TOMOYO_MAC_FILE_CREATE]     = "create",
  29         [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
  30         [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
  31         [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
  32         [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
  33         [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
  34         [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
  35         [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
  36         [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
  37         [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
  38         [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
  39         [TOMOYO_MAC_FILE_LINK]       = "link",
  40         [TOMOYO_MAC_FILE_RENAME]     = "rename",
  41         [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
  42         [TOMOYO_MAC_FILE_CHOWN]      = "chown",
  43         [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
  44         [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
  45         [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
  46         [TOMOYO_MAC_FILE_MOUNT]      = "mount",
  47         [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
  48         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
  49         /* CONFIG::network group */
  50         [TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
  51         [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
  52         [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
  53         [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
  54         [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
  55         [TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
  56         [TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
  57         [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
  58         [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
  59         [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
  60         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
  61         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
  62         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
  63         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
  64         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
  65         /* CONFIG::misc group */
  66         [TOMOYO_MAC_ENVIRON] = "env",
  67         /* CONFIG group */
  68         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  69         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
  70         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
  71 };
  72
  73 /* String table for conditions. */
  74 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
  75         [TOMOYO_TASK_UID]             = "task.uid",
  76         [TOMOYO_TASK_EUID]            = "task.euid",
  77         [TOMOYO_TASK_SUID]            = "task.suid",
  78         [TOMOYO_TASK_FSUID]           = "task.fsuid",
  79         [TOMOYO_TASK_GID]             = "task.gid",
  80         [TOMOYO_TASK_EGID]            = "task.egid",
  81         [TOMOYO_TASK_SGID]            = "task.sgid",
  82         [TOMOYO_TASK_FSGID]           = "task.fsgid",
  83         [TOMOYO_TASK_PID]             = "task.pid",
  84         [TOMOYO_TASK_PPID]            = "task.ppid",
  85         [TOMOYO_EXEC_ARGC]            = "exec.argc",
  86         [TOMOYO_EXEC_ENVC]            = "exec.envc",
  87         [TOMOYO_TYPE_IS_SOCKET]       = "socket",
  88         [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
  89         [TOMOYO_TYPE_IS_FILE]         = "file",
  90         [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
  91         [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
  92         [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
  93         [TOMOYO_TYPE_IS_FIFO]         = "fifo",
  94         [TOMOYO_MODE_SETUID]          = "setuid",
  95         [TOMOYO_MODE_SETGID]          = "setgid",
  96         [TOMOYO_MODE_STICKY]          = "sticky",
  97         [TOMOYO_MODE_OWNER_READ]      = "owner_read",
  98         [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
  99         [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
 100         [TOMOYO_MODE_GROUP_READ]      = "group_read",
 101         [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
 102         [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
 103         [TOMOYO_MODE_OTHERS_READ]     = "others_read",
 104         [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
 105         [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
 106         [TOMOYO_EXEC_REALPATH]        = "exec.realpath",
 107         [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
 108         [TOMOYO_PATH1_UID]            = "path1.uid",
 109         [TOMOYO_PATH1_GID]            = "path1.gid",
 110         [TOMOYO_PATH1_INO]            = "path1.ino",
 111         [TOMOYO_PATH1_MAJOR]          = "path1.major",
 112         [TOMOYO_PATH1_MINOR]          = "path1.minor",
 113         [TOMOYO_PATH1_PERM]           = "path1.perm",
 114         [TOMOYO_PATH1_TYPE]           = "path1.type",
 115         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
 116         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
 117         [TOMOYO_PATH2_UID]            = "path2.uid",
 118         [TOMOYO_PATH2_GID]            = "path2.gid",
 119         [TOMOYO_PATH2_INO]            = "path2.ino",
 120         [TOMOYO_PATH2_MAJOR]          = "path2.major",
 121         [TOMOYO_PATH2_MINOR]          = "path2.minor",
 122         [TOMOYO_PATH2_PERM]           = "path2.perm",
 123         [TOMOYO_PATH2_TYPE]           = "path2.type",
 124         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
 125         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
 126         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
 127         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
 128         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
 129         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
 130         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
 131         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
 132         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
 133         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
 134 };
 135
 136 /* String table for PREFERENCE keyword. */
 137 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
 138         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
 139         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
 140 };
 141
 142 /* String table for path operation. */
 143 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
 144         [TOMOYO_TYPE_EXECUTE]    = "execute",
 145         [TOMOYO_TYPE_READ]       = "read",
 146         [TOMOYO_TYPE_WRITE]      = "write",
 147         [TOMOYO_TYPE_APPEND]     = "append",
 148         [TOMOYO_TYPE_UNLINK]     = "unlink",
 149         [TOMOYO_TYPE_GETATTR]    = "getattr",
 150         [TOMOYO_TYPE_RMDIR]      = "rmdir",
 151         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
 152         [TOMOYO_TYPE_SYMLINK]    = "symlink",
 153         [TOMOYO_TYPE_CHROOT]     = "chroot",
 154         [TOMOYO_TYPE_UMOUNT]     = "unmount",
 155 };
 156
 157 /* String table for socket's operation. */
 158 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
 159         [TOMOYO_NETWORK_BIND]    = "bind",
 160         [TOMOYO_NETWORK_LISTEN]  = "listen",
 161         [TOMOYO_NETWORK_CONNECT] = "connect",
 162         [TOMOYO_NETWORK_SEND]    = "send",
 163 };
 164
 165 /* String table for categories. */
 166 static const char * const tomoyo_category_keywords
 167 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
 168         [TOMOYO_MAC_CATEGORY_FILE]    = "file",
 169         [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
 170         [TOMOYO_MAC_CATEGORY_MISC]    = "misc",
 171 };
 172
 173 /* Permit policy management by non-root user? */
 174 static bool tomoyo_manage_by_non_root;
 175
 176 /* Utility functions. */
 177
 178 /**
 179  * tomoyo_addprintf - strncat()-like-snprintf().
 180  *
 181  * @buffer: Buffer to write to. Must be '\0'-terminated.
 182  * @len:    Size of @buffer.
 183  * @fmt:    The printf()'s format string, followed by parameters.
 184  *
 185  * Returns nothing.
 186  */
 187 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
 188 {
 189         va_list args;
 190         const int pos = strlen(buffer);
 191
 192         va_start(args, fmt);
 193         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
 194         va_end(args);
 195 }
 196
 197 /**
 198  * tomoyo_flush - Flush queued string to userspace's buffer.
 199  *
 200  * @head:   Pointer to "struct tomoyo_io_buffer".
 201  *
 202  * Returns true if all data was flushed, false otherwise.
 203  */
 204 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 205 {
 206         while (head->r.w_pos) {
 207                 const char *w = head->r.w[0];
 208                 size_t len = strlen(w);
 209
 210                 if (len) {
 211                         if (len > head->read_user_buf_avail)
 212                                 len = head->read_user_buf_avail;
 213                         if (!len)
 214                                 return false;
 215                         if (copy_to_user(head->read_user_buf, w, len))
 216                                 return false;
 217                         head->read_user_buf_avail -= len;
 218                         head->read_user_buf += len;
 219                         w += len;
 220                 }
 221                 head->r.w[0] = w;
 222                 if (*w)
 223                         return false;
 224                 /* Add '\0' for audit logs and query. */
 225                 if (head->poll) {
 226                         if (!head->read_user_buf_avail ||
 227                             copy_to_user(head->read_user_buf, "", 1))
 228                                 return false;
 229                         head->read_user_buf_avail--;
 230                         head->read_user_buf++;
 231                 }
 232                 head->r.w_pos--;
 233                 for (len = 0; len < head->r.w_pos; len++)
 234                         head->r.w[len] = head->r.w[len + 1];
 235         }
 236         head->r.avail = 0;
 237         return true;
 238 }
 239
 240 /**
 241  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 242  *
 243  * @head:   Pointer to "struct tomoyo_io_buffer".
 244  * @string: String to print.
 245  *
 246  * Note that @string has to be kept valid until @head is kfree()d.
 247  * This means that char[] allocated on stack memory cannot be passed to
 248  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 249  */
 250 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 251 {
 252         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 253                 head->r.w[head->r.w_pos++] = string;
 254                 tomoyo_flush(head);
 255         } else
 256                 WARN_ON(1);
 257 }
 258
 259 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 260                              ...) __printf(2, 3);
 261
 262 /**
 263  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 264  *
 265  * @head: Pointer to "struct tomoyo_io_buffer".
 266  * @fmt:  The printf()'s format string, followed by parameters.
 267  */
 268 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 269                              ...)
 270 {
 271         va_list args;
 272         size_t len;
 273         size_t pos = head->r.avail;
 274         int size = head->readbuf_size - pos;
 275
 276         if (size <= 0)
 277                 return;
 278         va_start(args, fmt);
 279         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 280         va_end(args);
 281         if (pos + len >= head->readbuf_size) {
 282                 WARN_ON(1);
 283                 return;
 284         }
 285         head->r.avail += len;
 286         tomoyo_set_string(head, head->read_buf + pos);
 287 }
 288
 289 /**
 290  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 291  *
 292  * @head: Pointer to "struct tomoyo_io_buffer".
 293  *
 294  * Returns nothing.
 295  */
 296 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 297 {
 298         tomoyo_set_string(head, " ");
 299 }
 300
 301 /**
 302  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 303  *
 304  * @head: Pointer to "struct tomoyo_io_buffer".
 305  *
 306  * Returns nothing.
 307  */
 308 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 309 {
 310         tomoyo_set_string(head, "\n");
 311         return !head->r.w_pos;
 312 }
 313
 314 /**
 315  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 316  *
 317  * @head: Pointer to "struct tomoyo_io_buffer".
 318  *
 319  * Returns nothing.
 320  */
 321 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 322 {
 323         tomoyo_set_string(head, "/");
 324 }
 325
 326 /* List of namespaces. */
 327 LIST_HEAD(tomoyo_namespace_list);
 328 /* True if namespace other than tomoyo_kernel_namespace is defined. */
 329 static bool tomoyo_namespace_enabled;
 330
 331 /**
 332  * tomoyo_init_policy_namespace - Initialize namespace.
 333  *
 334  * @ns: Pointer to "struct tomoyo_policy_namespace".
 335  *
 336  * Returns nothing.
 337  */
 338 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 339 {
 340         unsigned int idx;
 341
 342         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 343                 INIT_LIST_HEAD(&ns->acl_group[idx]);
 344         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 345                 INIT_LIST_HEAD(&ns->group_list[idx]);
 346         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 347                 INIT_LIST_HEAD(&ns->policy_list[idx]);
 348         ns->profile_version = 20150505;
 349         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 350         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 351 }
 352
 353 /**
 354  * tomoyo_print_namespace - Print namespace header.
 355  *
 356  * @head: Pointer to "struct tomoyo_io_buffer".
 357  *
 358  * Returns nothing.
 359  */
 360 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 361 {
 362         if (!tomoyo_namespace_enabled)
 363                 return;
 364         tomoyo_set_string(head,
 365                           container_of(head->r.ns,
 366                                        struct tomoyo_policy_namespace,
 367                                        namespace_list)->name);
 368         tomoyo_set_space(head);
 369 }
 370
 371 /**
 372  * tomoyo_print_name_union - Print a tomoyo_name_union.
 373  *
 374  * @head: Pointer to "struct tomoyo_io_buffer".
 375  * @ptr:  Pointer to "struct tomoyo_name_union".
 376  */
 377 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 378                                     const struct tomoyo_name_union *ptr)
 379 {
 380         tomoyo_set_space(head);
 381         if (ptr->group) {
 382                 tomoyo_set_string(head, "@");
 383                 tomoyo_set_string(head, ptr->group->group_name->name);
 384         } else {
 385                 tomoyo_set_string(head, ptr->filename->name);
 386         }
 387 }
 388
 389 /**
 390  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
 391  *
 392  * @head: Pointer to "struct tomoyo_io_buffer".
 393  * @ptr:  Pointer to "struct tomoyo_name_union".
 394  *
 395  * Returns nothing.
 396  */
 397 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
 398                                            const struct tomoyo_name_union *ptr)
 399 {
 400         if (ptr->group) {
 401                 tomoyo_set_string(head, "@");
 402                 tomoyo_set_string(head, ptr->group->group_name->name);
 403         } else {
 404                 tomoyo_set_string(head, "\"");
 405                 tomoyo_set_string(head, ptr->filename->name);
 406                 tomoyo_set_string(head, "\"");
 407         }
 408 }
 409
 410 /**
 411  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 412  *
 413  * @head: Pointer to "struct tomoyo_io_buffer".
 414  * @ptr:  Pointer to "struct tomoyo_number_union".
 415  *
 416  * Returns nothing.
 417  */
 418 static void tomoyo_print_number_union_nospace
 419 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 420 {
 421         if (ptr->group) {
 422                 tomoyo_set_string(head, "@");
 423                 tomoyo_set_string(head, ptr->group->group_name->name);
 424         } else {
 425                 int i;
 426                 unsigned long min = ptr->values[0];
 427                 const unsigned long max = ptr->values[1];
 428                 u8 min_type = ptr->value_type[0];
 429                 const u8 max_type = ptr->value_type[1];
 430                 char buffer[128];
 431
 432                 buffer[0] = '\0';
 433                 for (i = 0; i < 2; i++) {
 434                         switch (min_type) {
 435                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 436                                 tomoyo_addprintf(buffer, sizeof(buffer),
 437                                                  "0x%lX", min);
 438                                 break;
 439                         case TOMOYO_VALUE_TYPE_OCTAL:
 440                                 tomoyo_addprintf(buffer, sizeof(buffer),
 441                                                  "0%lo", min);
 442                                 break;
 443                         default:
 444                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 445                                                  min);
 446                                 break;
 447                         }
 448                         if (min == max && min_type == max_type)
 449                                 break;
 450                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 451                         min_type = max_type;
 452                         min = max;
 453                 }
 454                 tomoyo_io_printf(head, "%s", buffer);
 455         }
 456 }
 457
 458 /**
 459  * tomoyo_print_number_union - Print a tomoyo_number_union.
 460  *
 461  * @head: Pointer to "struct tomoyo_io_buffer".
 462  * @ptr:  Pointer to "struct tomoyo_number_union".
 463  *
 464  * Returns nothing.
 465  */
 466 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 467                                       const struct tomoyo_number_union *ptr)
 468 {
 469         tomoyo_set_space(head);
 470         tomoyo_print_number_union_nospace(head, ptr);
 471 }
 472
 473 /**
 474  * tomoyo_assign_profile - Create a new profile.
 475  *
 476  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 477  * @profile: Profile number to create.
 478  *
 479  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 480  */
 481 static struct tomoyo_profile *tomoyo_assign_profile
 482 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
 483 {
 484         struct tomoyo_profile *ptr;
 485         struct tomoyo_profile *entry;
 486
 487         if (profile >= TOMOYO_MAX_PROFILES)
 488                 return NULL;
 489         ptr = ns->profile_ptr[profile];
 490         if (ptr)
 491                 return ptr;
 492         entry = kzalloc(sizeof(*entry), GFP_NOFS | __GFP_NOWARN);
 493         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 494                 goto out;
 495         ptr = ns->profile_ptr[profile];
 496         if (!ptr && tomoyo_memory_ok(entry)) {
 497                 ptr = entry;
 498                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 499                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 500                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 501                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 502                        sizeof(ptr->config));
 503                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
 504                         CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
 505                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
 506                         CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
 507                 mb(); /* Avoid out-of-order execution. */
 508                 ns->profile_ptr[profile] = ptr;
 509                 entry = NULL;
 510         }
 511         mutex_unlock(&tomoyo_policy_lock);
 512  out:
 513         kfree(entry);
 514         return ptr;
 515 }
 516
 517 /**
 518  * tomoyo_profile - Find a profile.
 519  *
 520  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 521  * @profile: Profile number to find.
 522  *
 523  * Returns pointer to "struct tomoyo_profile".
 524  */
 525 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 526                                       const u8 profile)
 527 {
 528         static struct tomoyo_profile tomoyo_null_profile;
 529         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 530
 531         if (!ptr)
 532                 ptr = &tomoyo_null_profile;
 533         return ptr;
 534 }
 535
 536 /**
 537  * tomoyo_find_yesno - Find values for specified keyword.
 538  *
 539  * @string: String to check.
 540  * @find:   Name of keyword.
 541  *
 542  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 543  */
 544 static s8 tomoyo_find_yesno(const char *string, const char *find)
 545 {
 546         const char *cp = strstr(string, find);
 547
 548         if (cp) {
 549                 cp += strlen(find);
 550                 if (!strncmp(cp, "=yes", 4))
 551                         return 1;
 552                 else if (!strncmp(cp, "=no", 3))
 553                         return 0;
 554         }
 555         return -1;
 556 }
 557
 558 /**
 559  * tomoyo_set_uint - Set value for specified preference.
 560  *
 561  * @i:      Pointer to "unsigned int".
 562  * @string: String to check.
 563  * @find:   Name of keyword.
 564  *
 565  * Returns nothing.
 566  */
 567 static void tomoyo_set_uint(unsigned int *i, const char *string,
 568                             const char *find)
 569 {
 570         const char *cp = strstr(string, find);
 571
 572         if (cp)
 573                 sscanf(cp + strlen(find), "=%u", i);
 574 }
 575
 576 /**
 577  * tomoyo_set_mode - Set mode for specified profile.
 578  *
 579  * @name:    Name of functionality.
 580  * @value:   Mode for @name.
 581  * @profile: Pointer to "struct tomoyo_profile".
 582  *
 583  * Returns 0 on success, negative value otherwise.
 584  */
 585 static int tomoyo_set_mode(char *name, const char *value,
 586                            struct tomoyo_profile *profile)
 587 {
 588         u8 i;
 589         u8 config;
 590
 591         if (!strcmp(name, "CONFIG")) {
 592                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 593                 config = profile->default_config;
 594         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 595                 config = 0;
 596                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 597                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 598                         int len = 0;
 599
 600                         if (i < TOMOYO_MAX_MAC_INDEX) {
 601                                 const u8 c = tomoyo_index2category[i];
 602                                 const char *category =
 603                                         tomoyo_category_keywords[c];
 604
 605                                 len = strlen(category);
 606                                 if (strncmp(name, category, len) ||
 607                                     name[len++] != ':' || name[len++] != ':')
 608                                         continue;
 609                         }
 610                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
 611                                 continue;
 612                         config = profile->config[i];
 613                         break;
 614                 }
 615                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 616                         return -EINVAL;
 617         } else {
 618                 return -EINVAL;
 619         }
 620         if (strstr(value, "use_default")) {
 621                 config = TOMOYO_CONFIG_USE_DEFAULT;
 622         } else {
 623                 u8 mode;
 624
 625                 for (mode = 0; mode < 4; mode++)
 626                         if (strstr(value, tomoyo_mode[mode]))
 627                                 /*
 628                                  * Update lower 3 bits in order to distinguish
 629                                  * 'config' from 'TOMOYO_CONFIG_USE_DEFAULT'.
 630                                  */
 631                                 config = (config & ~7) | mode;
 632                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 633                         switch (tomoyo_find_yesno(value, "grant_log")) {
 634                         case 1:
 635                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 636                                 break;
 637                         case 0:
 638                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 639                                 break;
 640                         }
 641                         switch (tomoyo_find_yesno(value, "reject_log")) {
 642                         case 1:
 643                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 644                                 break;
 645                         case 0:
 646                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 647                                 break;
 648                         }
 649                 }
 650         }
 651         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 652                 profile->config[i] = config;
 653         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 654                 profile->default_config = config;
 655         return 0;
 656 }
 657
 658 /**
 659  * tomoyo_write_profile - Write profile table.
 660  *
 661  * @head: Pointer to "struct tomoyo_io_buffer".
 662  *
 663  * Returns 0 on success, negative value otherwise.
 664  */
 665 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 666 {
 667         char *data = head->write_buf;
 668         unsigned int i;
 669         char *cp;
 670         struct tomoyo_profile *profile;
 671
 672         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 673             == 1)
 674                 return 0;
 675         i = simple_strtoul(data, &cp, 10);
 676         if (*cp != '-')
 677                 return -EINVAL;
 678         data = cp + 1;
 679         profile = tomoyo_assign_profile(head->w.ns, i);
 680         if (!profile)
 681                 return -EINVAL;
 682         cp = strchr(data, '=');
 683         if (!cp)
 684                 return -EINVAL;
 685         *cp++ = '\0';
 686         if (!strcmp(data, "COMMENT")) {
 687                 static DEFINE_SPINLOCK(lock);
 688                 const struct tomoyo_path_info *new_comment
 689                         = tomoyo_get_name(cp);
 690                 const struct tomoyo_path_info *old_comment;
 691
 692                 if (!new_comment)
 693                         return -ENOMEM;
 694                 spin_lock(&lock);
 695                 old_comment = profile->comment;
 696                 profile->comment = new_comment;
 697                 spin_unlock(&lock);
 698                 tomoyo_put_name(old_comment);
 699                 return 0;
 700         }
 701         if (!strcmp(data, "PREFERENCE")) {
 702                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 703                         tomoyo_set_uint(&profile->pref[i], cp,
 704                                         tomoyo_pref_keywords[i]);
 705                 return 0;
 706         }
 707         return tomoyo_set_mode(data, cp, profile);
 708 }
 709
 710 /**
 711  * tomoyo_print_config - Print mode for specified functionality.
 712  *
 713  * @head:   Pointer to "struct tomoyo_io_buffer".
 714  * @config: Mode for that functionality.
 715  *
 716  * Returns nothing.
 717  *
 718  * Caller prints functionality's name.
 719  */
 720 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 721 {
 722         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 723                          tomoyo_mode[config & 3],
 724                          str_yes_no(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 725                          str_yes_no(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 726 }
 727
 728 /**
 729  * tomoyo_read_profile - Read profile table.
 730  *
 731  * @head: Pointer to "struct tomoyo_io_buffer".
 732  *
 733  * Returns nothing.
 734  */
 735 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 736 {
 737         u8 index;
 738         struct tomoyo_policy_namespace *ns =
 739                 container_of(head->r.ns, typeof(*ns), namespace_list);
 740         const struct tomoyo_profile *profile;
 741
 742         if (head->r.eof)
 743                 return;
 744  next:
 745         index = head->r.index;
 746         profile = ns->profile_ptr[index];
 747         switch (head->r.step) {
 748         case 0:
 749                 tomoyo_print_namespace(head);
 750                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 751                                  ns->profile_version);
 752                 head->r.step++;
 753                 break;
 754         case 1:
 755                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 756                       head->r.index++)
 757                         if (ns->profile_ptr[head->r.index])
 758                                 break;
 759                 if (head->r.index == TOMOYO_MAX_PROFILES) {
 760                         head->r.eof = true;
 761                         return;
 762                 }
 763                 head->r.step++;
 764                 break;
 765         case 2:
 766                 {
 767                         u8 i;
 768                         const struct tomoyo_path_info *comment =
 769                                 profile->comment;
 770
 771                         tomoyo_print_namespace(head);
 772                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 773                         tomoyo_set_string(head, comment ? comment->name : "");
 774                         tomoyo_set_lf(head);
 775                         tomoyo_print_namespace(head);
 776                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 777                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 778                                 tomoyo_io_printf(head, "%s=%u ",
 779                                                  tomoyo_pref_keywords[i],
 780                                                  profile->pref[i]);
 781                         tomoyo_set_string(head, "}\n");
 782                         head->r.step++;
 783                 }
 784                 break;
 785         case 3:
 786                 {
 787                         tomoyo_print_namespace(head);
 788                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 789                         tomoyo_print_config(head, profile->default_config);
 790                         head->r.bit = 0;
 791                         head->r.step++;
 792                 }
 793                 break;
 794         case 4:
 795                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 796                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 797                         const u8 i = head->r.bit;
 798                         const u8 config = profile->config[i];
 799
 800                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 801                                 continue;
 802                         tomoyo_print_namespace(head);
 803                         if (i < TOMOYO_MAX_MAC_INDEX)
 804                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 805                                                  index,
 806                                                  tomoyo_category_keywords
 807                                                  [tomoyo_index2category[i]],
 808                                                  tomoyo_mac_keywords[i]);
 809                         else
 810                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 811                                                  tomoyo_mac_keywords[i]);
 812                         tomoyo_print_config(head, config);
 813                         head->r.bit++;
 814                         break;
 815                 }
 816                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 817                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 818                         head->r.index++;
 819                         head->r.step = 1;
 820                 }
 821                 break;
 822         }
 823         if (tomoyo_flush(head))
 824                 goto next;
 825 }
 826
 827 /**
 828  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
 829  *
 830  * @a: Pointer to "struct tomoyo_acl_head".
 831  * @b: Pointer to "struct tomoyo_acl_head".
 832  *
 833  * Returns true if @a == @b, false otherwise.
 834  */
 835 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 836                                 const struct tomoyo_acl_head *b)
 837 {
 838         return container_of(a, struct tomoyo_manager, head)->manager ==
 839                 container_of(b, struct tomoyo_manager, head)->manager;
 840 }
 841
 842 /**
 843  * tomoyo_update_manager_entry - Add a manager entry.
 844  *
 845  * @manager:   The path to manager or the domainnamme.
 846  * @is_delete: True if it is a delete request.
 847  *
 848  * Returns 0 on success, negative value otherwise.
 849  *
 850  * Caller holds tomoyo_read_lock().
 851  */
 852 static int tomoyo_update_manager_entry(const char *manager,
 853                                        const bool is_delete)
 854 {
 855         struct tomoyo_manager e = { };
 856         struct tomoyo_acl_param param = {
 857                 /* .ns = &tomoyo_kernel_namespace, */
 858                 .is_delete = is_delete,
 859                 .list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
 860         };
 861         int error = is_delete ? -ENOENT : -ENOMEM;
 862
 863         if (!tomoyo_correct_domain(manager) &&
 864             !tomoyo_correct_word(manager))
 865                 return -EINVAL;
 866         e.manager = tomoyo_get_name(manager);
 867         if (e.manager) {
 868                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 869                                              tomoyo_same_manager);
 870                 tomoyo_put_name(e.manager);
 871         }
 872         return error;
 873 }
 874
 875 /**
 876  * tomoyo_write_manager - Write manager policy.
 877  *
 878  * @head: Pointer to "struct tomoyo_io_buffer".
 879  *
 880  * Returns 0 on success, negative value otherwise.
 881  *
 882  * Caller holds tomoyo_read_lock().
 883  */
 884 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 885 {
 886         char *data = head->write_buf;
 887
 888         if (!strcmp(data, "manage_by_non_root")) {
 889                 tomoyo_manage_by_non_root = !head->w.is_delete;
 890                 return 0;
 891         }
 892         return tomoyo_update_manager_entry(data, head->w.is_delete);
 893 }
 894
 895 /**
 896  * tomoyo_read_manager - Read manager policy.
 897  *
 898  * @head: Pointer to "struct tomoyo_io_buffer".
 899  *
 900  * Caller holds tomoyo_read_lock().
 901  */
 902 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 903 {
 904         if (head->r.eof)
 905                 return;
 906         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
 907                 struct tomoyo_manager *ptr =
 908                         list_entry(head->r.acl, typeof(*ptr), head.list);
 909
 910                 if (ptr->head.is_deleted)
 911                         continue;
 912                 if (!tomoyo_flush(head))
 913                         return;
 914                 tomoyo_set_string(head, ptr->manager->name);
 915                 tomoyo_set_lf(head);
 916         }
 917         head->r.eof = true;
 918 }
 919
 920 /**
 921  * tomoyo_manager - Check whether the current process is a policy manager.
 922  *
 923  * Returns true if the current process is permitted to modify policy
 924  * via /sys/kernel/security/tomoyo/ interface.
 925  *
 926  * Caller holds tomoyo_read_lock().
 927  */
 928 static bool tomoyo_manager(void)
 929 {
 930         struct tomoyo_manager *ptr;
 931         const char *exe;
 932         const struct task_struct *task = current;
 933         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 934         bool found = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
 935
 936         if (!tomoyo_policy_loaded)
 937                 return true;
 938         if (!tomoyo_manage_by_non_root &&
 939             (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
 940              !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
 941                 return false;
 942         exe = tomoyo_get_exe();
 943         if (!exe)
 944                 return false;
 945         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list,
 946                                 srcu_read_lock_held(&tomoyo_ss)) {
 947                 if (!ptr->head.is_deleted &&
 948                     (!tomoyo_pathcmp(domainname, ptr->manager) ||
 949                      !strcmp(exe, ptr->manager->name))) {
 950                         found = true;
 951                         break;
 952                 }
 953         }
 954         if (!found) { /* Reduce error messages. */
 955                 static pid_t last_pid;
 956                 const pid_t pid = current->pid;
 957
 958                 if (last_pid != pid) {
 959                         pr_warn("%s ( %s ) is not permitted to update policies.\n",
 960                                 domainname->name, exe);
 961                         last_pid = pid;
 962                 }
 963         }
 964         kfree(exe);
 965         return found;
 966 }
 967
 968 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
 969 (unsigned int serial);
 970
 971 /**
 972  * tomoyo_select_domain - Parse select command.
 973  *
 974  * @head: Pointer to "struct tomoyo_io_buffer".
 975  * @data: String to parse.
 976  *
 977  * Returns true on success, false otherwise.
 978  *
 979  * Caller holds tomoyo_read_lock().
 980  */
 981 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 982                                  const char *data)
 983 {
 984         unsigned int pid;
 985         struct tomoyo_domain_info *domain = NULL;
 986         bool global_pid = false;
 987
 988         if (strncmp(data, "select ", 7))
 989                 return false;
 990         data += 7;
 991         if (sscanf(data, "pid=%u", &pid) == 1 ||
 992             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 993                 struct task_struct *p;
 994
 995                 rcu_read_lock();
 996                 if (global_pid)
 997                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 998                 else
 999                         p = find_task_by_vpid(pid);
1000                 if (p)
1001                         domain = tomoyo_task(p)->domain_info;
1002                 rcu_read_unlock();
1003         } else if (!strncmp(data, "domain=", 7)) {
1004                 if (tomoyo_domain_def(data + 7))
1005                         domain = tomoyo_find_domain(data + 7);
1006         } else if (sscanf(data, "Q=%u", &pid) == 1) {
1007                 domain = tomoyo_find_domain_by_qid(pid);
1008         } else
1009                 return false;
1010         head->w.domain = domain;
1011         /* Accessing read_buf is safe because head->io_sem is held. */
1012         if (!head->read_buf)
1013                 return true; /* Do nothing if open(O_WRONLY). */
1014         memset(&head->r, 0, sizeof(head->r));
1015         head->r.print_this_domain_only = true;
1016         if (domain)
1017                 head->r.domain = &domain->list;
1018         else
1019                 head->r.eof = true;
1020         tomoyo_io_printf(head, "# select %s\n", data);
1021         if (domain && domain->is_deleted)
1022                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1023         return true;
1024 }
1025
1026 /**
1027  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1028  *
1029  * @a: Pointer to "struct tomoyo_acl_info".
1030  * @b: Pointer to "struct tomoyo_acl_info".
1031  *
1032  * Returns true if @a == @b, false otherwise.
1033  */
1034 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1035                                  const struct tomoyo_acl_info *b)
1036 {
1037         const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1038         const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1039
1040         return p1->domainname == p2->domainname;
1041 }
1042
1043 /**
1044  * tomoyo_write_task - Update task related list.
1045  *
1046  * @param: Pointer to "struct tomoyo_acl_param".
1047  *
1048  * Returns 0 on success, negative value otherwise.
1049  *
1050  * Caller holds tomoyo_read_lock().
1051  */
1052 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1053 {
1054         int error = -EINVAL;
1055
1056         if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1057                 struct tomoyo_task_acl e = {
1058                         .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1059                         .domainname = tomoyo_get_domainname(param),
1060                 };
1061
1062                 if (e.domainname)
1063                         error = tomoyo_update_domain(&e.head, sizeof(e), param,
1064                                                      tomoyo_same_task_acl,
1065                                                      NULL);
1066                 tomoyo_put_name(e.domainname);
1067         }
1068         return error;
1069 }
1070
1071 /**
1072  * tomoyo_delete_domain - Delete a domain.
1073  *
1074  * @domainname: The name of domain.
1075  *
1076  * Returns 0 on success, negative value otherwise.
1077  *
1078  * Caller holds tomoyo_read_lock().
1079  */
1080 static int tomoyo_delete_domain(char *domainname)
1081 {
1082         struct tomoyo_domain_info *domain;
1083         struct tomoyo_path_info name;
1084
1085         name.name = domainname;
1086         tomoyo_fill_path_info(&name);
1087         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1088                 return -EINTR;
1089         /* Is there an active domain? */
1090         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
1091                                 srcu_read_lock_held(&tomoyo_ss)) {
1092                 /* Never delete tomoyo_kernel_domain */
1093                 if (domain == &tomoyo_kernel_domain)
1094                         continue;
1095                 if (domain->is_deleted ||
1096                     tomoyo_pathcmp(domain->domainname, &name))
1097                         continue;
1098                 domain->is_deleted = true;
1099                 break;
1100         }
1101         mutex_unlock(&tomoyo_policy_lock);
1102         return 0;
1103 }
1104
1105 /**
1106  * tomoyo_write_domain2 - Write domain policy.
1107  *
1108  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1109  * @list:      Pointer to "struct list_head".
1110  * @data:      Policy to be interpreted.
1111  * @is_delete: True if it is a delete request.
1112  *
1113  * Returns 0 on success, negative value otherwise.
1114  *
1115  * Caller holds tomoyo_read_lock().
1116  */
1117 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1118                                 struct list_head *list, char *data,
1119                                 const bool is_delete)
1120 {
1121         struct tomoyo_acl_param param = {
1122                 .ns = ns,
1123                 .list = list,
1124                 .data = data,
1125                 .is_delete = is_delete,
1126         };
1127         static const struct {
1128                 const char *keyword;
1129                 int (*write)(struct tomoyo_acl_param *param);
1130         } tomoyo_callback[5] = {
1131                 { "file ", tomoyo_write_file },
1132                 { "network inet ", tomoyo_write_inet_network },
1133                 { "network unix ", tomoyo_write_unix_network },
1134                 { "misc ", tomoyo_write_misc },
1135                 { "task ", tomoyo_write_task },
1136         };
1137         u8 i;
1138
1139         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1140                 if (!tomoyo_str_starts(&param.data,
1141                                        tomoyo_callback[i].keyword))
1142                         continue;
1143                 return tomoyo_callback[i].write(&param);
1144         }
1145         return -EINVAL;
1146 }
1147
1148 /* String table for domain flags. */
1149 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1150         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1151         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1152 };
1153
1154 /**
1155  * tomoyo_write_domain - Write domain policy.
1156  *
1157  * @head: Pointer to "struct tomoyo_io_buffer".
1158  *
1159  * Returns 0 on success, negative value otherwise.
1160  *
1161  * Caller holds tomoyo_read_lock().
1162  */
1163 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1164 {
1165         char *data = head->write_buf;
1166         struct tomoyo_policy_namespace *ns;
1167         struct tomoyo_domain_info *domain = head->w.domain;
1168         const bool is_delete = head->w.is_delete;
1169         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1170         unsigned int idx;
1171
1172         if (*data == '<') {
1173                 int ret = 0;
1174
1175                 domain = NULL;
1176                 if (is_delete)
1177                         ret = tomoyo_delete_domain(data);
1178                 else if (is_select)
1179                         domain = tomoyo_find_domain(data);
1180                 else
1181                         domain = tomoyo_assign_domain(data, false);
1182                 head->w.domain = domain;
1183                 return ret;
1184         }
1185         if (!domain)
1186                 return -EINVAL;
1187         ns = domain->ns;
1188         if (sscanf(data, "use_profile %u", &idx) == 1
1189             && idx < TOMOYO_MAX_PROFILES) {
1190                 if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
1191                         if (!is_delete)
1192                                 domain->profile = (u8) idx;
1193                 return 0;
1194         }
1195         if (sscanf(data, "use_group %u\n", &idx) == 1
1196             && idx < TOMOYO_MAX_ACL_GROUPS) {
1197                 if (!is_delete)
1198                         set_bit(idx, domain->group);
1199                 else
1200                         clear_bit(idx, domain->group);
1201                 return 0;
1202         }
1203         for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1204                 const char *cp = tomoyo_dif[idx];
1205
1206                 if (strncmp(data, cp, strlen(cp) - 1))
1207                         continue;
1208                 domain->flags[idx] = !is_delete;
1209                 return 0;
1210         }
1211         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1212                                     is_delete);
1213 }
1214
1215 /**
1216  * tomoyo_print_condition - Print condition part.
1217  *
1218  * @head: Pointer to "struct tomoyo_io_buffer".
1219  * @cond: Pointer to "struct tomoyo_condition".
1220  *
1221  * Returns true on success, false otherwise.
1222  */
1223 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1224                                    const struct tomoyo_condition *cond)
1225 {
1226         switch (head->r.cond_step) {
1227         case 0:
1228                 head->r.cond_index = 0;
1229                 head->r.cond_step++;
1230                 if (cond->transit) {
1231                         tomoyo_set_space(head);
1232                         tomoyo_set_string(head, cond->transit->name);
1233                 }
1234                 fallthrough;
1235         case 1:
1236                 {
1237                         const u16 condc = cond->condc;
1238                         const struct tomoyo_condition_element *condp =
1239                                 (typeof(condp)) (cond + 1);
1240                         const struct tomoyo_number_union *numbers_p =
1241                                 (typeof(numbers_p)) (condp + condc);
1242                         const struct tomoyo_name_union *names_p =
1243                                 (typeof(names_p))
1244                                 (numbers_p + cond->numbers_count);
1245                         const struct tomoyo_argv *argv =
1246                                 (typeof(argv)) (names_p + cond->names_count);
1247                         const struct tomoyo_envp *envp =
1248                                 (typeof(envp)) (argv + cond->argc);
1249                         u16 skip;
1250
1251                         for (skip = 0; skip < head->r.cond_index; skip++) {
1252                                 const u8 left = condp->left;
1253                                 const u8 right = condp->right;
1254
1255                                 condp++;
1256                                 switch (left) {
1257                                 case TOMOYO_ARGV_ENTRY:
1258                                         argv++;
1259                                         continue;
1260                                 case TOMOYO_ENVP_ENTRY:
1261                                         envp++;
1262                                         continue;
1263                                 case TOMOYO_NUMBER_UNION:
1264                                         numbers_p++;
1265                                         break;
1266                                 }
1267                                 switch (right) {
1268                                 case TOMOYO_NAME_UNION:
1269                                         names_p++;
1270                                         break;
1271                                 case TOMOYO_NUMBER_UNION:
1272                                         numbers_p++;
1273                                         break;
1274                                 }
1275                         }
1276                         while (head->r.cond_index < condc) {
1277                                 const u8 match = condp->equals;
1278                                 const u8 left = condp->left;
1279                                 const u8 right = condp->right;
1280
1281                                 if (!tomoyo_flush(head))
1282                                         return false;
1283                                 condp++;
1284                                 head->r.cond_index++;
1285                                 tomoyo_set_space(head);
1286                                 switch (left) {
1287                                 case TOMOYO_ARGV_ENTRY:
1288                                         tomoyo_io_printf(head,
1289                                                          "exec.argv[%lu]%s=\"",
1290                                                          argv->index, argv->is_not ? "!" : "");
1291                                         tomoyo_set_string(head,
1292                                                           argv->value->name);
1293                                         tomoyo_set_string(head, "\"");
1294                                         argv++;
1295                                         continue;
1296                                 case TOMOYO_ENVP_ENTRY:
1297                                         tomoyo_set_string(head,
1298                                                           "exec.envp[\"");
1299                                         tomoyo_set_string(head,
1300                                                           envp->name->name);
1301                                         tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1302                                         if (envp->value) {
1303                                                 tomoyo_set_string(head, "\"");
1304                                                 tomoyo_set_string(head, envp->value->name);
1305                                                 tomoyo_set_string(head, "\"");
1306                                         } else {
1307                                                 tomoyo_set_string(head,
1308                                                                   "NULL");
1309                                         }
1310                                         envp++;
1311                                         continue;
1312                                 case TOMOYO_NUMBER_UNION:
1313                                         tomoyo_print_number_union_nospace
1314                                                 (head, numbers_p++);
1315                                         break;
1316                                 default:
1317                                         tomoyo_set_string(head,
1318                                                tomoyo_condition_keyword[left]);
1319                                         break;
1320                                 }
1321                                 tomoyo_set_string(head, match ? "=" : "!=");
1322                                 switch (right) {
1323                                 case TOMOYO_NAME_UNION:
1324                                         tomoyo_print_name_union_quoted
1325                                                 (head, names_p++);
1326                                         break;
1327                                 case TOMOYO_NUMBER_UNION:
1328                                         tomoyo_print_number_union_nospace
1329                                                 (head, numbers_p++);
1330                                         break;
1331                                 default:
1332                                         tomoyo_set_string(head,
1333                                           tomoyo_condition_keyword[right]);
1334                                         break;
1335                                 }
1336                         }
1337                 }
1338                 head->r.cond_step++;
1339                 fallthrough;
1340         case 2:
1341                 if (!tomoyo_flush(head))
1342                         break;
1343                 head->r.cond_step++;
1344                 fallthrough;
1345         case 3:
1346                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1347                         tomoyo_io_printf(head, " grant_log=%s",
1348                                          str_yes_no(cond->grant_log ==
1349                                                     TOMOYO_GRANTLOG_YES));
1350                 tomoyo_set_lf(head);
1351                 return true;
1352         }
1353         return false;
1354 }
1355
1356 /**
1357  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1358  *
1359  * @head:     Pointer to "struct tomoyo_io_buffer".
1360  * @category: Category name.
1361  *
1362  * Returns nothing.
1363  */
1364 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1365                              const char *category)
1366 {
1367         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1368                 tomoyo_print_namespace(head);
1369                 tomoyo_io_printf(head, "acl_group %u ",
1370                                  head->r.acl_group_index);
1371         }
1372         tomoyo_set_string(head, category);
1373 }
1374
1375 /**
1376  * tomoyo_print_entry - Print an ACL entry.
1377  *
1378  * @head: Pointer to "struct tomoyo_io_buffer".
1379  * @acl:  Pointer to an ACL entry.
1380  *
1381  * Returns true on success, false otherwise.
1382  */
1383 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1384                                struct tomoyo_acl_info *acl)
1385 {
1386         const u8 acl_type = acl->type;
1387         bool first = true;
1388         u8 bit;
1389
1390         if (head->r.print_cond_part)
1391                 goto print_cond_part;
1392         if (acl->is_deleted)
1393                 return true;
1394         if (!tomoyo_flush(head))
1395                 return false;
1396         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1397                 struct tomoyo_path_acl *ptr =
1398                         container_of(acl, typeof(*ptr), head);
1399                 const u16 perm = ptr->perm;
1400
1401                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1402                         if (!(perm & (1 << bit)))
1403                                 continue;
1404                         if (head->r.print_transition_related_only &&
1405                             bit != TOMOYO_TYPE_EXECUTE)
1406                                 continue;
1407                         if (first) {
1408                                 tomoyo_set_group(head, "file ");
1409                                 first = false;
1410                         } else {
1411                                 tomoyo_set_slash(head);
1412                         }
1413                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1414                 }
1415                 if (first)
1416                         return true;
1417                 tomoyo_print_name_union(head, &ptr->name);
1418         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1419                 struct tomoyo_task_acl *ptr =
1420                         container_of(acl, typeof(*ptr), head);
1421
1422                 tomoyo_set_group(head, "task ");
1423                 tomoyo_set_string(head, "manual_domain_transition ");
1424                 tomoyo_set_string(head, ptr->domainname->name);
1425         } else if (head->r.print_transition_related_only) {
1426                 return true;
1427         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1428                 struct tomoyo_path2_acl *ptr =
1429                         container_of(acl, typeof(*ptr), head);
1430                 const u8 perm = ptr->perm;
1431
1432                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1433                         if (!(perm & (1 << bit)))
1434                                 continue;
1435                         if (first) {
1436                                 tomoyo_set_group(head, "file ");
1437                                 first = false;
1438                         } else {
1439                                 tomoyo_set_slash(head);
1440                         }
1441                         tomoyo_set_string(head, tomoyo_mac_keywords
1442                                           [tomoyo_pp2mac[bit]]);
1443                 }
1444                 if (first)
1445                         return true;
1446                 tomoyo_print_name_union(head, &ptr->name1);
1447                 tomoyo_print_name_union(head, &ptr->name2);
1448         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1449                 struct tomoyo_path_number_acl *ptr =
1450                         container_of(acl, typeof(*ptr), head);
1451                 const u8 perm = ptr->perm;
1452
1453                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1454                         if (!(perm & (1 << bit)))
1455                                 continue;
1456                         if (first) {
1457                                 tomoyo_set_group(head, "file ");
1458                                 first = false;
1459                         } else {
1460                                 tomoyo_set_slash(head);
1461                         }
1462                         tomoyo_set_string(head, tomoyo_mac_keywords
1463                                           [tomoyo_pn2mac[bit]]);
1464                 }
1465                 if (first)
1466                         return true;
1467                 tomoyo_print_name_union(head, &ptr->name);
1468                 tomoyo_print_number_union(head, &ptr->number);
1469         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1470                 struct tomoyo_mkdev_acl *ptr =
1471                         container_of(acl, typeof(*ptr), head);
1472                 const u8 perm = ptr->perm;
1473
1474                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1475                         if (!(perm & (1 << bit)))
1476                                 continue;
1477                         if (first) {
1478                                 tomoyo_set_group(head, "file ");
1479                                 first = false;
1480                         } else {
1481                                 tomoyo_set_slash(head);
1482                         }
1483                         tomoyo_set_string(head, tomoyo_mac_keywords
1484                                           [tomoyo_pnnn2mac[bit]]);
1485                 }
1486                 if (first)
1487                         return true;
1488                 tomoyo_print_name_union(head, &ptr->name);
1489                 tomoyo_print_number_union(head, &ptr->mode);
1490                 tomoyo_print_number_union(head, &ptr->major);
1491                 tomoyo_print_number_union(head, &ptr->minor);
1492         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1493                 struct tomoyo_inet_acl *ptr =
1494                         container_of(acl, typeof(*ptr), head);
1495                 const u8 perm = ptr->perm;
1496
1497                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1498                         if (!(perm & (1 << bit)))
1499                                 continue;
1500                         if (first) {
1501                                 tomoyo_set_group(head, "network inet ");
1502                                 tomoyo_set_string(head, tomoyo_proto_keyword
1503                                                   [ptr->protocol]);
1504                                 tomoyo_set_space(head);
1505                                 first = false;
1506                         } else {
1507                                 tomoyo_set_slash(head);
1508                         }
1509                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1510                 }
1511                 if (first)
1512                         return true;
1513                 tomoyo_set_space(head);
1514                 if (ptr->address.group) {
1515                         tomoyo_set_string(head, "@");
1516                         tomoyo_set_string(head, ptr->address.group->group_name
1517                                           ->name);
1518                 } else {
1519                         char buf[128];
1520
1521                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1522                         tomoyo_io_printf(head, "%s", buf);
1523                 }
1524                 tomoyo_print_number_union(head, &ptr->port);
1525         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1526                 struct tomoyo_unix_acl *ptr =
1527                         container_of(acl, typeof(*ptr), head);
1528                 const u8 perm = ptr->perm;
1529
1530                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1531                         if (!(perm & (1 << bit)))
1532                                 continue;
1533                         if (first) {
1534                                 tomoyo_set_group(head, "network unix ");
1535                                 tomoyo_set_string(head, tomoyo_proto_keyword
1536                                                   [ptr->protocol]);
1537                                 tomoyo_set_space(head);
1538                                 first = false;
1539                         } else {
1540                                 tomoyo_set_slash(head);
1541                         }
1542                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1543                 }
1544                 if (first)
1545                         return true;
1546                 tomoyo_print_name_union(head, &ptr->name);
1547         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1548                 struct tomoyo_mount_acl *ptr =
1549                         container_of(acl, typeof(*ptr), head);
1550
1551                 tomoyo_set_group(head, "file mount");
1552                 tomoyo_print_name_union(head, &ptr->dev_name);
1553                 tomoyo_print_name_union(head, &ptr->dir_name);
1554                 tomoyo_print_name_union(head, &ptr->fs_type);
1555                 tomoyo_print_number_union(head, &ptr->flags);
1556         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1557                 struct tomoyo_env_acl *ptr =
1558                         container_of(acl, typeof(*ptr), head);
1559
1560                 tomoyo_set_group(head, "misc env ");
1561                 tomoyo_set_string(head, ptr->env->name);
1562         }
1563         if (acl->cond) {
1564                 head->r.print_cond_part = true;
1565                 head->r.cond_step = 0;
1566                 if (!tomoyo_flush(head))
1567                         return false;
1568 print_cond_part:
1569                 if (!tomoyo_print_condition(head, acl->cond))
1570                         return false;
1571                 head->r.print_cond_part = false;
1572         } else {
1573                 tomoyo_set_lf(head);
1574         }
1575         return true;
1576 }
1577
1578 /**
1579  * tomoyo_read_domain2 - Read domain policy.
1580  *
1581  * @head: Pointer to "struct tomoyo_io_buffer".
1582  * @list: Pointer to "struct list_head".
1583  *
1584  * Caller holds tomoyo_read_lock().
1585  *
1586  * Returns true on success, false otherwise.
1587  */
1588 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1589                                 struct list_head *list)
1590 {
1591         list_for_each_cookie(head->r.acl, list) {
1592                 struct tomoyo_acl_info *ptr =
1593                         list_entry(head->r.acl, typeof(*ptr), list);
1594
1595                 if (!tomoyo_print_entry(head, ptr))
1596                         return false;
1597         }
1598         head->r.acl = NULL;
1599         return true;
1600 }
1601
1602 /**
1603  * tomoyo_read_domain - Read domain policy.
1604  *
1605  * @head: Pointer to "struct tomoyo_io_buffer".
1606  *
1607  * Caller holds tomoyo_read_lock().
1608  */
1609 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1610 {
1611         if (head->r.eof)
1612                 return;
1613         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1614                 struct tomoyo_domain_info *domain =
1615                         list_entry(head->r.domain, typeof(*domain), list);
1616                 u8 i;
1617
1618                 switch (head->r.step) {
1619                 case 0:
1620                         if (domain->is_deleted &&
1621                             !head->r.print_this_domain_only)
1622                                 continue;
1623                         /* Print domainname and flags. */
1624                         tomoyo_set_string(head, domain->domainname->name);
1625                         tomoyo_set_lf(head);
1626                         tomoyo_io_printf(head, "use_profile %u\n",
1627                                          domain->profile);
1628                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1629                                 if (domain->flags[i])
1630                                         tomoyo_set_string(head, tomoyo_dif[i]);
1631                         head->r.index = 0;
1632                         head->r.step++;
1633                         fallthrough;
1634                 case 1:
1635                         while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1636                                 i = head->r.index++;
1637                                 if (!test_bit(i, domain->group))
1638                                         continue;
1639                                 tomoyo_io_printf(head, "use_group %u\n", i);
1640                                 if (!tomoyo_flush(head))
1641                                         return;
1642                         }
1643                         head->r.index = 0;
1644                         head->r.step++;
1645                         tomoyo_set_lf(head);
1646                         fallthrough;
1647                 case 2:
1648                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1649                                 return;
1650                         head->r.step++;
1651                         if (!tomoyo_set_lf(head))
1652                                 return;
1653                         fallthrough;
1654                 case 3:
1655                         head->r.step = 0;
1656                         if (head->r.print_this_domain_only)
1657                                 goto done;
1658                 }
1659         }
1660  done:
1661         head->r.eof = true;
1662 }
1663
1664 /**
1665  * tomoyo_write_pid: Specify PID to obtain domainname.
1666  *
1667  * @head: Pointer to "struct tomoyo_io_buffer".
1668  *
1669  * Returns 0.
1670  */
1671 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1672 {
1673         head->r.eof = false;
1674         return 0;
1675 }
1676
1677 /**
1678  * tomoyo_read_pid - Get domainname of the specified PID.
1679  *
1680  * @head: Pointer to "struct tomoyo_io_buffer".
1681  *
1682  * Returns the domainname which the specified PID is in on success,
1683  * empty string otherwise.
1684  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1685  * using read()/write() interface rather than sysctl() interface.
1686  */
1687 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1688 {
1689         char *buf = head->write_buf;
1690         bool global_pid = false;
1691         unsigned int pid;
1692         struct task_struct *p;
1693         struct tomoyo_domain_info *domain = NULL;
1694
1695         /* Accessing write_buf is safe because head->io_sem is held. */
1696         if (!buf) {
1697                 head->r.eof = true;
1698                 return; /* Do nothing if open(O_RDONLY). */
1699         }
1700         if (head->r.w_pos || head->r.eof)
1701                 return;
1702         head->r.eof = true;
1703         if (tomoyo_str_starts(&buf, "global-pid "))
1704                 global_pid = true;
1705         if (kstrtouint(buf, 10, &pid))
1706                 return;
1707         rcu_read_lock();
1708         if (global_pid)
1709                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1710         else
1711                 p = find_task_by_vpid(pid);
1712         if (p)
1713                 domain = tomoyo_task(p)->domain_info;
1714         rcu_read_unlock();
1715         if (!domain)
1716                 return;
1717         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1718         tomoyo_set_string(head, domain->domainname->name);
1719 }
1720
1721 /* String table for domain transition control keywords. */
1722 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1723         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1724         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1725         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1726         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1727         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1728         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1729 };
1730
1731 /* String table for grouping keywords. */
1732 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1733         [TOMOYO_PATH_GROUP]    = "path_group ",
1734         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1735         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1736 };
1737
1738 /**
1739  * tomoyo_write_exception - Write exception policy.
1740  *
1741  * @head: Pointer to "struct tomoyo_io_buffer".
1742  *
1743  * Returns 0 on success, negative value otherwise.
1744  *
1745  * Caller holds tomoyo_read_lock().
1746  */
1747 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1748 {
1749         const bool is_delete = head->w.is_delete;
1750         struct tomoyo_acl_param param = {
1751                 .ns = head->w.ns,
1752                 .is_delete = is_delete,
1753                 .data = head->write_buf,
1754         };
1755         u8 i;
1756
1757         if (tomoyo_str_starts(&param.data, "aggregator "))
1758                 return tomoyo_write_aggregator(&param);
1759         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1760                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1761                         return tomoyo_write_transition_control(&param, i);
1762         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1763                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1764                         return tomoyo_write_group(&param, i);
1765         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1766                 unsigned int group;
1767                 char *data;
1768
1769                 group = simple_strtoul(param.data, &data, 10);
1770                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1771                         return tomoyo_write_domain2
1772                                 (head->w.ns, &head->w.ns->acl_group[group],
1773                                  data, is_delete);
1774         }
1775         return -EINVAL;
1776 }
1777
1778 /**
1779  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1780  *
1781  * @head: Pointer to "struct tomoyo_io_buffer".
1782  * @idx:  Index number.
1783  *
1784  * Returns true on success, false otherwise.
1785  *
1786  * Caller holds tomoyo_read_lock().
1787  */
1788 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1789 {
1790         struct tomoyo_policy_namespace *ns =
1791                 container_of(head->r.ns, typeof(*ns), namespace_list);
1792         struct list_head *list = &ns->group_list[idx];
1793
1794         list_for_each_cookie(head->r.group, list) {
1795                 struct tomoyo_group *group =
1796                         list_entry(head->r.group, typeof(*group), head.list);
1797
1798                 list_for_each_cookie(head->r.acl, &group->member_list) {
1799                         struct tomoyo_acl_head *ptr =
1800                                 list_entry(head->r.acl, typeof(*ptr), list);
1801
1802                         if (ptr->is_deleted)
1803                                 continue;
1804                         if (!tomoyo_flush(head))
1805                                 return false;
1806                         tomoyo_print_namespace(head);
1807                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1808                         tomoyo_set_string(head, group->group_name->name);
1809                         if (idx == TOMOYO_PATH_GROUP) {
1810                                 tomoyo_set_space(head);
1811                                 tomoyo_set_string(head, container_of
1812                                                (ptr, struct tomoyo_path_group,
1813                                                 head)->member_name->name);
1814                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1815                                 tomoyo_print_number_union(head, &container_of
1816                                                           (ptr,
1817                                                    struct tomoyo_number_group,
1818                                                            head)->number);
1819                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1820                                 char buffer[128];
1821                                 struct tomoyo_address_group *member =
1822                                         container_of(ptr, typeof(*member),
1823                                                      head);
1824
1825                                 tomoyo_print_ip(buffer, sizeof(buffer),
1826                                                 &member->address);
1827                                 tomoyo_io_printf(head, " %s", buffer);
1828                         }
1829                         tomoyo_set_lf(head);
1830                 }
1831                 head->r.acl = NULL;
1832         }
1833         head->r.group = NULL;
1834         return true;
1835 }
1836
1837 /**
1838  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1839  *
1840  * @head: Pointer to "struct tomoyo_io_buffer".
1841  * @idx:  Index number.
1842  *
1843  * Returns true on success, false otherwise.
1844  *
1845  * Caller holds tomoyo_read_lock().
1846  */
1847 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1848 {
1849         struct tomoyo_policy_namespace *ns =
1850                 container_of(head->r.ns, typeof(*ns), namespace_list);
1851         struct list_head *list = &ns->policy_list[idx];
1852
1853         list_for_each_cookie(head->r.acl, list) {
1854                 struct tomoyo_acl_head *acl =
1855                         container_of(head->r.acl, typeof(*acl), list);
1856                 if (acl->is_deleted)
1857                         continue;
1858                 if (!tomoyo_flush(head))
1859                         return false;
1860                 switch (idx) {
1861                 case TOMOYO_ID_TRANSITION_CONTROL:
1862                         {
1863                                 struct tomoyo_transition_control *ptr =
1864                                         container_of(acl, typeof(*ptr), head);
1865
1866                                 tomoyo_print_namespace(head);
1867                                 tomoyo_set_string(head, tomoyo_transition_type
1868                                                   [ptr->type]);
1869                                 tomoyo_set_string(head, ptr->program ?
1870                                                   ptr->program->name : "any");
1871                                 tomoyo_set_string(head, " from ");
1872                                 tomoyo_set_string(head, ptr->domainname ?
1873                                                   ptr->domainname->name :
1874                                                   "any");
1875                         }
1876                         break;
1877                 case TOMOYO_ID_AGGREGATOR:
1878                         {
1879                                 struct tomoyo_aggregator *ptr =
1880                                         container_of(acl, typeof(*ptr), head);
1881
1882                                 tomoyo_print_namespace(head);
1883                                 tomoyo_set_string(head, "aggregator ");
1884                                 tomoyo_set_string(head,
1885                                                   ptr->original_name->name);
1886                                 tomoyo_set_space(head);
1887                                 tomoyo_set_string(head,
1888                                                ptr->aggregated_name->name);
1889                         }
1890                         break;
1891                 default:
1892                         continue;
1893                 }
1894                 tomoyo_set_lf(head);
1895         }
1896         head->r.acl = NULL;
1897         return true;
1898 }
1899
1900 /**
1901  * tomoyo_read_exception - Read exception policy.
1902  *
1903  * @head: Pointer to "struct tomoyo_io_buffer".
1904  *
1905  * Caller holds tomoyo_read_lock().
1906  */
1907 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1908 {
1909         struct tomoyo_policy_namespace *ns =
1910                 container_of(head->r.ns, typeof(*ns), namespace_list);
1911
1912         if (head->r.eof)
1913                 return;
1914         while (head->r.step < TOMOYO_MAX_POLICY &&
1915                tomoyo_read_policy(head, head->r.step))
1916                 head->r.step++;
1917         if (head->r.step < TOMOYO_MAX_POLICY)
1918                 return;
1919         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1920                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1921                 head->r.step++;
1922         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1923                 return;
1924         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1925                + TOMOYO_MAX_ACL_GROUPS) {
1926                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1927                         - TOMOYO_MAX_GROUP;
1928                 if (!tomoyo_read_domain2(head, &ns->acl_group
1929                                          [head->r.acl_group_index]))
1930                         return;
1931                 head->r.step++;
1932         }
1933         head->r.eof = true;
1934 }
1935
1936 /* Wait queue for kernel -> userspace notification. */
1937 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1938 /* Wait queue for userspace -> kernel notification. */
1939 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1940
1941 /* Structure for query. */
1942 struct tomoyo_query {
1943         struct list_head list;
1944         struct tomoyo_domain_info *domain;
1945         char *query;
1946         size_t query_len;
1947         unsigned int serial;
1948         u8 timer;
1949         u8 answer;
1950         u8 retry;
1951 };
1952
1953 /* The list for "struct tomoyo_query". */
1954 static LIST_HEAD(tomoyo_query_list);
1955
1956 /* Lock for manipulating tomoyo_query_list. */
1957 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1958
1959 /*
1960  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1961  * interface.
1962  */
1963 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1964
1965 /**
1966  * tomoyo_truncate - Truncate a line.
1967  *
1968  * @str: String to truncate.
1969  *
1970  * Returns length of truncated @str.
1971  */
1972 static int tomoyo_truncate(char *str)
1973 {
1974         char *start = str;
1975
1976         while (*(unsigned char *) str > (unsigned char) ' ')
1977                 str++;
1978         *str = '\0';
1979         return strlen(start) + 1;
1980 }
1981
1982 /**
1983  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1984  *
1985  * @domain: Pointer to "struct tomoyo_domain_info".
1986  * @header: Lines containing ACL.
1987  *
1988  * Returns nothing.
1989  */
1990 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1991 {
1992         char *buffer;
1993         char *realpath = NULL;
1994         char *argv0 = NULL;
1995         char *symlink = NULL;
1996         char *cp = strchr(header, '\n');
1997         int len;
1998
1999         if (!cp)
2000                 return;
2001         cp = strchr(cp + 1, '\n');
2002         if (!cp)
2003                 return;
2004         *cp++ = '\0';
2005         len = strlen(cp) + 1;
2006         /* strstr() will return NULL if ordering is wrong. */
2007         if (*cp == 'f') {
2008                 argv0 = strstr(header, " argv[]={ \"");
2009                 if (argv0) {
2010                         argv0 += 10;
2011                         len += tomoyo_truncate(argv0) + 14;
2012                 }
2013                 realpath = strstr(header, " exec={ realpath=\"");
2014                 if (realpath) {
2015                         realpath += 8;
2016                         len += tomoyo_truncate(realpath) + 6;
2017                 }
2018                 symlink = strstr(header, " symlink.target=\"");
2019                 if (symlink)
2020                         len += tomoyo_truncate(symlink + 1) + 1;
2021         }
2022         buffer = kmalloc(len, GFP_NOFS);
2023         if (!buffer)
2024                 return;
2025         snprintf(buffer, len - 1, "%s", cp);
2026         if (realpath)
2027                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2028         if (argv0)
2029                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2030         if (symlink)
2031                 tomoyo_addprintf(buffer, len, "%s", symlink);
2032         tomoyo_normalize_line(buffer);
2033         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2034                                   false))
2035                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2036         kfree(buffer);
2037 }
2038
2039 /**
2040  * tomoyo_supervisor - Ask for the supervisor's decision.
2041  *
2042  * @r:   Pointer to "struct tomoyo_request_info".
2043  * @fmt: The printf()'s format string, followed by parameters.
2044  *
2045  * Returns 0 if the supervisor decided to permit the access request which
2046  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2047  * supervisor decided to retry the access request which violated the policy in
2048  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2049  */
2050 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2051 {
2052         va_list args;
2053         int error;
2054         int len;
2055         static unsigned int tomoyo_serial;
2056         struct tomoyo_query entry = { };
2057         bool quota_exceeded = false;
2058
2059         va_start(args, fmt);
2060         len = vsnprintf(NULL, 0, fmt, args) + 1;
2061         va_end(args);
2062         /* Write /sys/kernel/security/tomoyo/audit. */
2063         va_start(args, fmt);
2064         tomoyo_write_log2(r, len, fmt, args);
2065         va_end(args);
2066         /* Nothing more to do if granted. */
2067         if (r->granted)
2068                 return 0;
2069         if (r->mode)
2070                 tomoyo_update_stat(r->mode);
2071         switch (r->mode) {
2072         case TOMOYO_CONFIG_ENFORCING:
2073                 error = -EPERM;
2074                 if (atomic_read(&tomoyo_query_observers))
2075                         break;
2076                 goto out;
2077         case TOMOYO_CONFIG_LEARNING:
2078                 error = 0;
2079                 /* Check max_learning_entry parameter. */
2080                 if (tomoyo_domain_quota_is_ok(r))
2081                         break;
2082                 fallthrough;
2083         default:
2084                 return 0;
2085         }
2086         /* Get message. */
2087         va_start(args, fmt);
2088         entry.query = tomoyo_init_log(r, len, fmt, args);
2089         va_end(args);
2090         if (!entry.query)
2091                 goto out;
2092         entry.query_len = strlen(entry.query) + 1;
2093         if (!error) {
2094                 tomoyo_add_entry(r->domain, entry.query);
2095                 goto out;
2096         }
2097         len = kmalloc_size_roundup(entry.query_len);
2098         entry.domain = r->domain;
2099         spin_lock(&tomoyo_query_list_lock);
2100         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2101             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2102             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2103                 quota_exceeded = true;
2104         } else {
2105                 entry.serial = tomoyo_serial++;
2106                 entry.retry = r->retry;
2107                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2108                 list_add_tail(&entry.list, &tomoyo_query_list);
2109         }
2110         spin_unlock(&tomoyo_query_list_lock);
2111         if (quota_exceeded)
2112                 goto out;
2113         /* Give 10 seconds for supervisor's opinion. */
2114         while (entry.timer < 10) {
2115                 wake_up_all(&tomoyo_query_wait);
2116                 if (wait_event_interruptible_timeout
2117                     (tomoyo_answer_wait, entry.answer ||
2118                      !atomic_read(&tomoyo_query_observers), HZ))
2119                         break;
2120                 entry.timer++;
2121         }
2122         spin_lock(&tomoyo_query_list_lock);
2123         list_del(&entry.list);
2124         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2125         spin_unlock(&tomoyo_query_list_lock);
2126         switch (entry.answer) {
2127         case 3: /* Asked to retry by administrator. */
2128                 error = TOMOYO_RETRY_REQUEST;
2129                 r->retry++;
2130                 break;
2131         case 1:
2132                 /* Granted by administrator. */
2133                 error = 0;
2134                 break;
2135         default:
2136                 /* Timed out or rejected by administrator. */
2137                 break;
2138         }
2139 out:
2140         kfree(entry.query);
2141         return error;
2142 }
2143
2144 /**
2145  * tomoyo_find_domain_by_qid - Get domain by query id.
2146  *
2147  * @serial: Query ID assigned by tomoyo_supervisor().
2148  *
2149  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2150  */
2151 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2152 (unsigned int serial)
2153 {
2154         struct tomoyo_query *ptr;
2155         struct tomoyo_domain_info *domain = NULL;
2156
2157         spin_lock(&tomoyo_query_list_lock);
2158         list_for_each_entry(ptr, &tomoyo_query_list, list) {
2159                 if (ptr->serial != serial)
2160                         continue;
2161                 domain = ptr->domain;
2162                 break;
2163         }
2164         spin_unlock(&tomoyo_query_list_lock);
2165         return domain;
2166 }
2167
2168 /**
2169  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2170  *
2171  * @file: Pointer to "struct file".
2172  * @wait: Pointer to "poll_table".
2173  *
2174  * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2175  *
2176  * Waits for access requests which violated policy in enforcing mode.
2177  */
2178 static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2179 {
2180         if (!list_empty(&tomoyo_query_list))
2181                 return EPOLLIN | EPOLLRDNORM;
2182         poll_wait(file, &tomoyo_query_wait, wait);
2183         if (!list_empty(&tomoyo_query_list))
2184                 return EPOLLIN | EPOLLRDNORM;
2185         return 0;
2186 }
2187
2188 /**
2189  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2190  *
2191  * @head: Pointer to "struct tomoyo_io_buffer".
2192  */
2193 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2194 {
2195         struct list_head *tmp;
2196         unsigned int pos = 0;
2197         size_t len = 0;
2198         char *buf;
2199
2200         if (head->r.w_pos)
2201                 return;
2202         kfree(head->read_buf);
2203         head->read_buf = NULL;
2204         spin_lock(&tomoyo_query_list_lock);
2205         list_for_each(tmp, &tomoyo_query_list) {
2206                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2207
2208                 if (pos++ != head->r.query_index)
2209                         continue;
2210                 len = ptr->query_len;
2211                 break;
2212         }
2213         spin_unlock(&tomoyo_query_list_lock);
2214         if (!len) {
2215                 head->r.query_index = 0;
2216                 return;
2217         }
2218         buf = kzalloc(len + 32, GFP_NOFS);
2219         if (!buf)
2220                 return;
2221         pos = 0;
2222         spin_lock(&tomoyo_query_list_lock);
2223         list_for_each(tmp, &tomoyo_query_list) {
2224                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2225
2226                 if (pos++ != head->r.query_index)
2227                         continue;
2228                 /*
2229                  * Some query can be skipped because tomoyo_query_list
2230                  * can change, but I don't care.
2231                  */
2232                 if (len == ptr->query_len)
2233                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2234                                  ptr->retry, ptr->query);
2235                 break;
2236         }
2237         spin_unlock(&tomoyo_query_list_lock);
2238         if (buf[0]) {
2239                 head->read_buf = buf;
2240                 head->r.w[head->r.w_pos++] = buf;
2241                 head->r.query_index++;
2242         } else {
2243                 kfree(buf);
2244         }
2245 }
2246
2247 /**
2248  * tomoyo_write_answer - Write the supervisor's decision.
2249  *
2250  * @head: Pointer to "struct tomoyo_io_buffer".
2251  *
2252  * Returns 0 on success, -EINVAL otherwise.
2253  */
2254 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2255 {
2256         char *data = head->write_buf;
2257         struct list_head *tmp;
2258         unsigned int serial;
2259         unsigned int answer;
2260
2261         spin_lock(&tomoyo_query_list_lock);
2262         list_for_each(tmp, &tomoyo_query_list) {
2263                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2264
2265                 ptr->timer = 0;
2266         }
2267         spin_unlock(&tomoyo_query_list_lock);
2268         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2269                 return -EINVAL;
2270         spin_lock(&tomoyo_query_list_lock);
2271         list_for_each(tmp, &tomoyo_query_list) {
2272                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2273
2274                 if (ptr->serial != serial)
2275                         continue;
2276                 ptr->answer = answer;
2277                 /* Remove from tomoyo_query_list. */
2278                 if (ptr->answer)
2279                         list_del_init(&ptr->list);
2280                 break;
2281         }
2282         spin_unlock(&tomoyo_query_list_lock);
2283         return 0;
2284 }
2285
2286 /**
2287  * tomoyo_read_version: Get version.
2288  *
2289  * @head: Pointer to "struct tomoyo_io_buffer".
2290  *
2291  * Returns version information.
2292  */
2293 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2294 {
2295         if (!head->r.eof) {
2296                 tomoyo_io_printf(head, "2.6.0");
2297                 head->r.eof = true;
2298         }
2299 }
2300
2301 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2302 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2303         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2304         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2305         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2306         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2307 };
2308
2309 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2310 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2311         [TOMOYO_MEMORY_POLICY] = "policy:",
2312         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2313         [TOMOYO_MEMORY_QUERY]  = "query message:",
2314 };
2315
2316 /* Counter for number of updates. */
2317 static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2318 /* Timestamp counter for last updated. */
2319 static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2320
2321 /**
2322  * tomoyo_update_stat - Update statistic counters.
2323  *
2324  * @index: Index for policy type.
2325  *
2326  * Returns nothing.
2327  */
2328 void tomoyo_update_stat(const u8 index)
2329 {
2330         atomic_inc(&tomoyo_stat_updated[index]);
2331         tomoyo_stat_modified[index] = ktime_get_real_seconds();
2332 }
2333
2334 /**
2335  * tomoyo_read_stat - Read statistic data.
2336  *
2337  * @head: Pointer to "struct tomoyo_io_buffer".
2338  *
2339  * Returns nothing.
2340  */
2341 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2342 {
2343         u8 i;
2344         unsigned int total = 0;
2345
2346         if (head->r.eof)
2347                 return;
2348         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2349                 tomoyo_io_printf(head, "Policy %-30s %10u",
2350                                  tomoyo_policy_headers[i],
2351                                  atomic_read(&tomoyo_stat_updated[i]));
2352                 if (tomoyo_stat_modified[i]) {
2353                         struct tomoyo_time stamp;
2354
2355                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2356                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2357                                          stamp.year, stamp.month, stamp.day,
2358                                          stamp.hour, stamp.min, stamp.sec);
2359                 }
2360                 tomoyo_set_lf(head);
2361         }
2362         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2363                 unsigned int used = tomoyo_memory_used[i];
2364
2365                 total += used;
2366                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2367                                  tomoyo_memory_headers[i], used);
2368                 used = tomoyo_memory_quota[i];
2369                 if (used)
2370                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2371                 tomoyo_set_lf(head);
2372         }
2373         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2374                          total);
2375         head->r.eof = true;
2376 }
2377
2378 /**
2379  * tomoyo_write_stat - Set memory quota.
2380  *
2381  * @head: Pointer to "struct tomoyo_io_buffer".
2382  *
2383  * Returns 0.
2384  */
2385 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2386 {
2387         char *data = head->write_buf;
2388         u8 i;
2389
2390         if (tomoyo_str_starts(&data, "Memory used by "))
2391                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2392                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2393                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2394         return 0;
2395 }
2396
2397 /**
2398  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2399  *
2400  * @type: Type of interface.
2401  * @file: Pointer to "struct file".
2402  *
2403  * Returns 0 on success, negative value otherwise.
2404  */
2405 int tomoyo_open_control(const u8 type, struct file *file)
2406 {
2407         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2408
2409         if (!head)
2410                 return -ENOMEM;
2411         mutex_init(&head->io_sem);
2412         head->type = type;
2413         switch (type) {
2414         case TOMOYO_DOMAINPOLICY:
2415                 /* /sys/kernel/security/tomoyo/domain_policy */
2416                 head->write = tomoyo_write_domain;
2417                 head->read = tomoyo_read_domain;
2418                 break;
2419         case TOMOYO_EXCEPTIONPOLICY:
2420                 /* /sys/kernel/security/tomoyo/exception_policy */
2421                 head->write = tomoyo_write_exception;
2422                 head->read = tomoyo_read_exception;
2423                 break;
2424         case TOMOYO_AUDIT:
2425                 /* /sys/kernel/security/tomoyo/audit */
2426                 head->poll = tomoyo_poll_log;
2427                 head->read = tomoyo_read_log;
2428                 break;
2429         case TOMOYO_PROCESS_STATUS:
2430                 /* /sys/kernel/security/tomoyo/.process_status */
2431                 head->write = tomoyo_write_pid;
2432                 head->read = tomoyo_read_pid;
2433                 break;
2434         case TOMOYO_VERSION:
2435                 /* /sys/kernel/security/tomoyo/version */
2436                 head->read = tomoyo_read_version;
2437                 head->readbuf_size = 128;
2438                 break;
2439         case TOMOYO_STAT:
2440                 /* /sys/kernel/security/tomoyo/stat */
2441                 head->write = tomoyo_write_stat;
2442                 head->read = tomoyo_read_stat;
2443                 head->readbuf_size = 1024;
2444                 break;
2445         case TOMOYO_PROFILE:
2446                 /* /sys/kernel/security/tomoyo/profile */
2447                 head->write = tomoyo_write_profile;
2448                 head->read = tomoyo_read_profile;
2449                 break;
2450         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2451                 head->poll = tomoyo_poll_query;
2452                 head->write = tomoyo_write_answer;
2453                 head->read = tomoyo_read_query;
2454                 break;
2455         case TOMOYO_MANAGER:
2456                 /* /sys/kernel/security/tomoyo/manager */
2457                 head->write = tomoyo_write_manager;
2458                 head->read = tomoyo_read_manager;
2459                 break;
2460         }
2461         if (!(file->f_mode & FMODE_READ)) {
2462                 /*
2463                  * No need to allocate read_buf since it is not opened
2464                  * for reading.
2465                  */
2466                 head->read = NULL;
2467                 head->poll = NULL;
2468         } else if (!head->poll) {
2469                 /* Don't allocate read_buf for poll() access. */
2470                 if (!head->readbuf_size)
2471                         head->readbuf_size = 4096 * 2;
2472                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2473                 if (!head->read_buf) {
2474                         kfree(head);
2475                         return -ENOMEM;
2476                 }
2477         }
2478         if (!(file->f_mode & FMODE_WRITE)) {
2479                 /*
2480                  * No need to allocate write_buf since it is not opened
2481                  * for writing.
2482                  */
2483                 head->write = NULL;
2484         } else if (head->write) {
2485                 head->writebuf_size = 4096 * 2;
2486                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2487                 if (!head->write_buf) {
2488                         kfree(head->read_buf);
2489                         kfree(head);
2490                         return -ENOMEM;
2491                 }
2492         }
2493         /*
2494          * If the file is /sys/kernel/security/tomoyo/query , increment the
2495          * observer counter.
2496          * The obserber counter is used by tomoyo_supervisor() to see if
2497          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2498          */
2499         if (type == TOMOYO_QUERY)
2500                 atomic_inc(&tomoyo_query_observers);
2501         file->private_data = head;
2502         tomoyo_notify_gc(head, true);
2503         return 0;
2504 }
2505
2506 /**
2507  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2508  *
2509  * @file: Pointer to "struct file".
2510  * @wait: Pointer to "poll_table". Maybe NULL.
2511  *
2512  * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2513  * EPOLLOUT | EPOLLWRNORM otherwise.
2514  */
2515 __poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2516 {
2517         struct tomoyo_io_buffer *head = file->private_data;
2518
2519         if (head->poll)
2520                 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2521         return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2522 }
2523
2524 /**
2525  * tomoyo_set_namespace_cursor - Set namespace to read.
2526  *
2527  * @head: Pointer to "struct tomoyo_io_buffer".
2528  *
2529  * Returns nothing.
2530  */
2531 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2532 {
2533         struct list_head *ns;
2534
2535         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2536             head->type != TOMOYO_PROFILE)
2537                 return;
2538         /*
2539          * If this is the first read, or reading previous namespace finished
2540          * and has more namespaces to read, update the namespace cursor.
2541          */
2542         ns = head->r.ns;
2543         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2544                 /* Clearing is OK because tomoyo_flush() returned true. */
2545                 memset(&head->r, 0, sizeof(head->r));
2546                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2547         }
2548 }
2549
2550 /**
2551  * tomoyo_has_more_namespace - Check for unread namespaces.
2552  *
2553  * @head: Pointer to "struct tomoyo_io_buffer".
2554  *
2555  * Returns true if we have more entries to print, false otherwise.
2556  */
2557 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2558 {
2559         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2560                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2561                 head->r.ns->next != &tomoyo_namespace_list;
2562 }
2563
2564 /**
2565  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2566  *
2567  * @head:       Pointer to "struct tomoyo_io_buffer".
2568  * @buffer:     Pointer to buffer to write to.
2569  * @buffer_len: Size of @buffer.
2570  *
2571  * Returns bytes read on success, negative value otherwise.
2572  */
2573 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2574                             const int buffer_len)
2575 {
2576         int len;
2577         int idx;
2578
2579         if (!head->read)
2580                 return -EINVAL;
2581         if (mutex_lock_interruptible(&head->io_sem))
2582                 return -EINTR;
2583         head->read_user_buf = buffer;
2584         head->read_user_buf_avail = buffer_len;
2585         idx = tomoyo_read_lock();
2586         if (tomoyo_flush(head))
2587                 /* Call the policy handler. */
2588                 do {
2589                         tomoyo_set_namespace_cursor(head);
2590                         head->read(head);
2591                 } while (tomoyo_flush(head) &&
2592                          tomoyo_has_more_namespace(head));
2593         tomoyo_read_unlock(idx);
2594         len = head->read_user_buf - buffer;
2595         mutex_unlock(&head->io_sem);
2596         return len;
2597 }
2598
2599 /**
2600  * tomoyo_parse_policy - Parse a policy line.
2601  *
2602  * @head: Pointer to "struct tomoyo_io_buffer".
2603  * @line: Line to parse.
2604  *
2605  * Returns 0 on success, negative value otherwise.
2606  *
2607  * Caller holds tomoyo_read_lock().
2608  */
2609 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2610 {
2611         /* Delete request? */
2612         head->w.is_delete = !strncmp(line, "delete ", 7);
2613         if (head->w.is_delete)
2614                 memmove(line, line + 7, strlen(line + 7) + 1);
2615         /* Selecting namespace to update. */
2616         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2617             head->type == TOMOYO_PROFILE) {
2618                 if (*line == '<') {
2619                         char *cp = strchr(line, ' ');
2620
2621                         if (cp) {
2622                                 *cp++ = '\0';
2623                                 head->w.ns = tomoyo_assign_namespace(line);
2624                                 memmove(line, cp, strlen(cp) + 1);
2625                         } else
2626                                 head->w.ns = NULL;
2627                 } else
2628                         head->w.ns = &tomoyo_kernel_namespace;
2629                 /* Don't allow updating if namespace is invalid. */
2630                 if (!head->w.ns)
2631                         return -ENOENT;
2632         }
2633         /* Do the update. */
2634         return head->write(head);
2635 }
2636
2637 /**
2638  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2639  *
2640  * @head:       Pointer to "struct tomoyo_io_buffer".
2641  * @buffer:     Pointer to buffer to read from.
2642  * @buffer_len: Size of @buffer.
2643  *
2644  * Returns @buffer_len on success, negative value otherwise.
2645  */
2646 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2647                              const char __user *buffer, const int buffer_len)
2648 {
2649         int error = buffer_len;
2650         size_t avail_len = buffer_len;
2651         char *cp0 = head->write_buf;
2652         int idx;
2653
2654         if (!head->write)
2655                 return -EINVAL;
2656         if (mutex_lock_interruptible(&head->io_sem))
2657                 return -EINTR;
2658         head->read_user_buf_avail = 0;
2659         idx = tomoyo_read_lock();
2660         /* Read a line and dispatch it to the policy handler. */
2661         while (avail_len > 0) {
2662                 char c;
2663
2664                 if (head->w.avail >= head->writebuf_size - 1) {
2665                         const int len = head->writebuf_size * 2;
2666                         char *cp = kzalloc(len, GFP_NOFS);
2667
2668                         if (!cp) {
2669                                 error = -ENOMEM;
2670                                 break;
2671                         }
2672                         memmove(cp, cp0, head->w.avail);
2673                         kfree(cp0);
2674                         head->write_buf = cp;
2675                         cp0 = cp;
2676                         head->writebuf_size = len;
2677                 }
2678                 if (get_user(c, buffer)) {
2679                         error = -EFAULT;
2680                         break;
2681                 }
2682                 buffer++;
2683                 avail_len--;
2684                 cp0[head->w.avail++] = c;
2685                 if (c != '\n')
2686                         continue;
2687                 cp0[head->w.avail - 1] = '\0';
2688                 head->w.avail = 0;
2689                 tomoyo_normalize_line(cp0);
2690                 if (!strcmp(cp0, "reset")) {
2691                         head->w.ns = &tomoyo_kernel_namespace;
2692                         head->w.domain = NULL;
2693                         memset(&head->r, 0, sizeof(head->r));
2694                         continue;
2695                 }
2696                 /* Don't allow updating policies by non manager programs. */
2697                 switch (head->type) {
2698                 case TOMOYO_PROCESS_STATUS:
2699                         /* This does not write anything. */
2700                         break;
2701                 case TOMOYO_DOMAINPOLICY:
2702                         if (tomoyo_select_domain(head, cp0))
2703                                 continue;
2704                         fallthrough;
2705                 case TOMOYO_EXCEPTIONPOLICY:
2706                         if (!strcmp(cp0, "select transition_only")) {
2707                                 head->r.print_transition_related_only = true;
2708                                 continue;
2709                         }
2710                         fallthrough;
2711                 default:
2712                         if (!tomoyo_manager()) {
2713                                 error = -EPERM;
2714                                 goto out;
2715                         }
2716                 }
2717                 switch (tomoyo_parse_policy(head, cp0)) {
2718                 case -EPERM:
2719                         error = -EPERM;
2720                         goto out;
2721                 case 0:
2722                         switch (head->type) {
2723                         case TOMOYO_DOMAINPOLICY:
2724                         case TOMOYO_EXCEPTIONPOLICY:
2725                         case TOMOYO_STAT:
2726                         case TOMOYO_PROFILE:
2727                         case TOMOYO_MANAGER:
2728                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2729                                 break;
2730                         default:
2731                                 break;
2732                         }
2733                         break;
2734                 }
2735         }
2736 out:
2737         tomoyo_read_unlock(idx);
2738         mutex_unlock(&head->io_sem);
2739         return error;
2740 }
2741
2742 /**
2743  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2744  *
2745  * @head: Pointer to "struct tomoyo_io_buffer".
2746  */
2747 void tomoyo_close_control(struct tomoyo_io_buffer *head)
2748 {
2749         /*
2750          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2751          * observer counter.
2752          */
2753         if (head->type == TOMOYO_QUERY &&
2754             atomic_dec_and_test(&tomoyo_query_observers))
2755                 wake_up_all(&tomoyo_answer_wait);
2756         tomoyo_notify_gc(head, false);
2757 }
2758
2759 /**
2760  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2761  */
2762 void tomoyo_check_profile(void)
2763 {
2764         struct tomoyo_domain_info *domain;
2765         const int idx = tomoyo_read_lock();
2766
2767         tomoyo_policy_loaded = true;
2768         pr_info("TOMOYO: 2.6.0\n");
2769         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
2770                                 srcu_read_lock_held(&tomoyo_ss)) {
2771                 const u8 profile = domain->profile;
2772                 struct tomoyo_policy_namespace *ns = domain->ns;
2773
2774                 if (ns->profile_version == 20110903) {
2775                         pr_info_once("Converting profile version from %u to %u.\n",
2776                                      20110903, 20150505);
2777                         ns->profile_version = 20150505;
2778                 }
2779                 if (ns->profile_version != 20150505)
2780                         pr_err("Profile version %u is not supported.\n",
2781                                ns->profile_version);
2782                 else if (!ns->profile_ptr[profile])
2783                         pr_err("Profile %u (used by '%s') is not defined.\n",
2784                                profile, domain->domainname->name);
2785                 else
2786                         continue;
2787                 pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2788                 pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n");
2789                 panic("STOP!");
2790         }
2791         tomoyo_read_unlock(idx);
2792         pr_info("Mandatory Access Control activated.\n");
2793 }
2794
2795 /**
2796  * tomoyo_load_builtin_policy - Load built-in policy.
2797  *
2798  * Returns nothing.
2799  */
2800 void __init tomoyo_load_builtin_policy(void)
2801 {
2802 #ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
2803         static char tomoyo_builtin_profile[] __initdata =
2804                 "PROFILE_VERSION=20150505\n"
2805                 "0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
2806         static char tomoyo_builtin_exception_policy[] __initdata =
2807                 "aggregator proc:/self/exe /proc/self/exe\n";
2808         static char tomoyo_builtin_domain_policy[] __initdata = "";
2809         static char tomoyo_builtin_manager[] __initdata = "";
2810         static char tomoyo_builtin_stat[] __initdata = "";
2811 #else
2812         /*
2813          * This include file is manually created and contains built-in policy
2814          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2815          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2816          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2817          */
2818 #include "builtin-policy.h"
2819 #endif
2820         u8 i;
2821         const int idx = tomoyo_read_lock();
2822
2823         for (i = 0; i < 5; i++) {
2824                 struct tomoyo_io_buffer head = { };
2825                 char *start = "";
2826
2827                 switch (i) {
2828                 case 0:
2829                         start = tomoyo_builtin_profile;
2830                         head.type = TOMOYO_PROFILE;
2831                         head.write = tomoyo_write_profile;
2832                         break;
2833                 case 1:
2834                         start = tomoyo_builtin_exception_policy;
2835                         head.type = TOMOYO_EXCEPTIONPOLICY;
2836                         head.write = tomoyo_write_exception;
2837                         break;
2838                 case 2:
2839                         start = tomoyo_builtin_domain_policy;
2840                         head.type = TOMOYO_DOMAINPOLICY;
2841                         head.write = tomoyo_write_domain;
2842                         break;
2843                 case 3:
2844                         start = tomoyo_builtin_manager;
2845                         head.type = TOMOYO_MANAGER;
2846                         head.write = tomoyo_write_manager;
2847                         break;
2848                 case 4:
2849                         start = tomoyo_builtin_stat;
2850                         head.type = TOMOYO_STAT;
2851                         head.write = tomoyo_write_stat;
2852                         break;
2853                 }
2854                 while (1) {
2855                         char *end = strchr(start, '\n');
2856
2857                         if (!end)
2858                                 break;
2859                         *end = '\0';
2860                         tomoyo_normalize_line(start);
2861                         head.write_buf = start;
2862                         tomoyo_parse_policy(&head, start);
2863                         start = end + 1;
2864                 }
2865         }
2866         tomoyo_read_unlock(idx);
2867 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2868         tomoyo_check_profile();
2869 #endif
2870 }