security/tomoyo/common.c

   1 /*
   2  * security/tomoyo/common.c
   3  *
   4  * Common functions for TOMOYO.
   5  *
   6  * Copyright (C) 2005-2010  NTT DATA CORPORATION
   7  */
   8
   9 #include <linux/uaccess.h>
  10 #include <linux/slab.h>
  11 #include <linux/security.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         [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
  26         [TOMOYO_MAC_FILE_OPEN]       = "open",
  27         [TOMOYO_MAC_FILE_CREATE]     = "create",
  28         [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
  29         [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
  30         [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
  31         [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
  32         [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
  33         [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
  34         [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
  35         [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
  36         [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
  37         [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
  38         [TOMOYO_MAC_FILE_LINK]       = "link",
  39         [TOMOYO_MAC_FILE_RENAME]     = "rename",
  40         [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
  41         [TOMOYO_MAC_FILE_CHOWN]      = "chown",
  42         [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
  43         [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
  44         [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
  45         [TOMOYO_MAC_FILE_MOUNT]      = "mount",
  46         [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
  47         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
  48         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  49 };
  50
  51 /* String table for conditions. */
  52 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
  53         [TOMOYO_TASK_UID]             = "task.uid",
  54         [TOMOYO_TASK_EUID]            = "task.euid",
  55         [TOMOYO_TASK_SUID]            = "task.suid",
  56         [TOMOYO_TASK_FSUID]           = "task.fsuid",
  57         [TOMOYO_TASK_GID]             = "task.gid",
  58         [TOMOYO_TASK_EGID]            = "task.egid",
  59         [TOMOYO_TASK_SGID]            = "task.sgid",
  60         [TOMOYO_TASK_FSGID]           = "task.fsgid",
  61         [TOMOYO_TASK_PID]             = "task.pid",
  62         [TOMOYO_TASK_PPID]            = "task.ppid",
  63         [TOMOYO_TYPE_IS_SOCKET]       = "socket",
  64         [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
  65         [TOMOYO_TYPE_IS_FILE]         = "file",
  66         [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
  67         [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
  68         [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
  69         [TOMOYO_TYPE_IS_FIFO]         = "fifo",
  70         [TOMOYO_MODE_SETUID]          = "setuid",
  71         [TOMOYO_MODE_SETGID]          = "setgid",
  72         [TOMOYO_MODE_STICKY]          = "sticky",
  73         [TOMOYO_MODE_OWNER_READ]      = "owner_read",
  74         [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
  75         [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
  76         [TOMOYO_MODE_GROUP_READ]      = "group_read",
  77         [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
  78         [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
  79         [TOMOYO_MODE_OTHERS_READ]     = "others_read",
  80         [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
  81         [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
  82         [TOMOYO_PATH1_UID]            = "path1.uid",
  83         [TOMOYO_PATH1_GID]            = "path1.gid",
  84         [TOMOYO_PATH1_INO]            = "path1.ino",
  85         [TOMOYO_PATH1_MAJOR]          = "path1.major",
  86         [TOMOYO_PATH1_MINOR]          = "path1.minor",
  87         [TOMOYO_PATH1_PERM]           = "path1.perm",
  88         [TOMOYO_PATH1_TYPE]           = "path1.type",
  89         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
  90         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
  91         [TOMOYO_PATH2_UID]            = "path2.uid",
  92         [TOMOYO_PATH2_GID]            = "path2.gid",
  93         [TOMOYO_PATH2_INO]            = "path2.ino",
  94         [TOMOYO_PATH2_MAJOR]          = "path2.major",
  95         [TOMOYO_PATH2_MINOR]          = "path2.minor",
  96         [TOMOYO_PATH2_PERM]           = "path2.perm",
  97         [TOMOYO_PATH2_TYPE]           = "path2.type",
  98         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
  99         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
 100         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
 101         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
 102         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
 103         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
 104         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
 105         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
 106         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
 107         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
 108 };
 109
 110 /* String table for PREFERENCE keyword. */
 111 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
 112         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
 113         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
 114 };
 115
 116 /* String table for path operation. */
 117 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
 118         [TOMOYO_TYPE_EXECUTE]    = "execute",
 119         [TOMOYO_TYPE_READ]       = "read",
 120         [TOMOYO_TYPE_WRITE]      = "write",
 121         [TOMOYO_TYPE_APPEND]     = "append",
 122         [TOMOYO_TYPE_UNLINK]     = "unlink",
 123         [TOMOYO_TYPE_GETATTR]    = "getattr",
 124         [TOMOYO_TYPE_RMDIR]      = "rmdir",
 125         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
 126         [TOMOYO_TYPE_SYMLINK]    = "symlink",
 127         [TOMOYO_TYPE_CHROOT]     = "chroot",
 128         [TOMOYO_TYPE_UMOUNT]     = "unmount",
 129 };
 130
 131 /* String table for categories. */
 132 static const char * const tomoyo_category_keywords
 133 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
 134         [TOMOYO_MAC_CATEGORY_FILE]       = "file",
 135 };
 136
 137 /* Permit policy management by non-root user? */
 138 static bool tomoyo_manage_by_non_root;
 139
 140 /* Utility functions. */
 141
 142 /**
 143  * tomoyo_yesno - Return "yes" or "no".
 144  *
 145  * @value: Bool value.
 146  */
 147 const char *tomoyo_yesno(const unsigned int value)
 148 {
 149         return value ? "yes" : "no";
 150 }
 151
 152 /**
 153  * tomoyo_addprintf - strncat()-like-snprintf().
 154  *
 155  * @buffer: Buffer to write to. Must be '\0'-terminated.
 156  * @len:    Size of @buffer.
 157  * @fmt:    The printf()'s format string, followed by parameters.
 158  *
 159  * Returns nothing.
 160  */
 161 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
 162 {
 163         va_list args;
 164         const int pos = strlen(buffer);
 165         va_start(args, fmt);
 166         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
 167         va_end(args);
 168 }
 169
 170 /**
 171  * tomoyo_flush - Flush queued string to userspace's buffer.
 172  *
 173  * @head:   Pointer to "struct tomoyo_io_buffer".
 174  *
 175  * Returns true if all data was flushed, false otherwise.
 176  */
 177 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 178 {
 179         while (head->r.w_pos) {
 180                 const char *w = head->r.w[0];
 181                 size_t len = strlen(w);
 182                 if (len) {
 183                         if (len > head->read_user_buf_avail)
 184                                 len = head->read_user_buf_avail;
 185                         if (!len)
 186                                 return false;
 187                         if (copy_to_user(head->read_user_buf, w, len))
 188                                 return false;
 189                         head->read_user_buf_avail -= len;
 190                         head->read_user_buf += len;
 191                         w += len;
 192                 }
 193                 head->r.w[0] = w;
 194                 if (*w)
 195                         return false;
 196                 /* Add '\0' for audit logs and query. */
 197                 if (head->poll) {
 198                         if (!head->read_user_buf_avail ||
 199                             copy_to_user(head->read_user_buf, "", 1))
 200                                 return false;
 201                         head->read_user_buf_avail--;
 202                         head->read_user_buf++;
 203                 }
 204                 head->r.w_pos--;
 205                 for (len = 0; len < head->r.w_pos; len++)
 206                         head->r.w[len] = head->r.w[len + 1];
 207         }
 208         head->r.avail = 0;
 209         return true;
 210 }
 211
 212 /**
 213  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 214  *
 215  * @head:   Pointer to "struct tomoyo_io_buffer".
 216  * @string: String to print.
 217  *
 218  * Note that @string has to be kept valid until @head is kfree()d.
 219  * This means that char[] allocated on stack memory cannot be passed to
 220  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 221  */
 222 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 223 {
 224         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 225                 head->r.w[head->r.w_pos++] = string;
 226                 tomoyo_flush(head);
 227         } else
 228                 WARN_ON(1);
 229 }
 230
 231 /**
 232  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 233  *
 234  * @head: Pointer to "struct tomoyo_io_buffer".
 235  * @fmt:  The printf()'s format string, followed by parameters.
 236  */
 237 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 238 {
 239         va_list args;
 240         size_t len;
 241         size_t pos = head->r.avail;
 242         int size = head->readbuf_size - pos;
 243         if (size <= 0)
 244                 return;
 245         va_start(args, fmt);
 246         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 247         va_end(args);
 248         if (pos + len >= head->readbuf_size) {
 249                 WARN_ON(1);
 250                 return;
 251         }
 252         head->r.avail += len;
 253         tomoyo_set_string(head, head->read_buf + pos);
 254 }
 255
 256 /**
 257  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 258  *
 259  * @head: Pointer to "struct tomoyo_io_buffer".
 260  *
 261  * Returns nothing.
 262  */
 263 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 264 {
 265         tomoyo_set_string(head, " ");
 266 }
 267
 268 /**
 269  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 270  *
 271  * @head: Pointer to "struct tomoyo_io_buffer".
 272  *
 273  * Returns nothing.
 274  */
 275 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 276 {
 277         tomoyo_set_string(head, "\n");
 278         return !head->r.w_pos;
 279 }
 280
 281 /**
 282  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 283  *
 284  * @head: Pointer to "struct tomoyo_io_buffer".
 285  *
 286  * Returns nothing.
 287  */
 288 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 289 {
 290         tomoyo_set_string(head, "/");
 291 }
 292
 293 /* List of namespaces. */
 294 LIST_HEAD(tomoyo_namespace_list);
 295 /* True if namespace other than tomoyo_kernel_namespace is defined. */
 296 static bool tomoyo_namespace_enabled;
 297
 298 /**
 299  * tomoyo_init_policy_namespace - Initialize namespace.
 300  *
 301  * @ns: Pointer to "struct tomoyo_policy_namespace".
 302  *
 303  * Returns nothing.
 304  */
 305 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 306 {
 307         unsigned int idx;
 308         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 309                 INIT_LIST_HEAD(&ns->acl_group[idx]);
 310         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 311                 INIT_LIST_HEAD(&ns->group_list[idx]);
 312         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 313                 INIT_LIST_HEAD(&ns->policy_list[idx]);
 314         ns->profile_version = 20100903;
 315         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 316         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 317 }
 318
 319 /**
 320  * tomoyo_print_namespace - Print namespace header.
 321  *
 322  * @head: Pointer to "struct tomoyo_io_buffer".
 323  *
 324  * Returns nothing.
 325  */
 326 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 327 {
 328         if (!tomoyo_namespace_enabled)
 329                 return;
 330         tomoyo_set_string(head,
 331                           container_of(head->r.ns,
 332                                        struct tomoyo_policy_namespace,
 333                                        namespace_list)->name);
 334         tomoyo_set_space(head);
 335 }
 336
 337 /**
 338  * tomoyo_print_name_union - Print a tomoyo_name_union.
 339  *
 340  * @head: Pointer to "struct tomoyo_io_buffer".
 341  * @ptr:  Pointer to "struct tomoyo_name_union".
 342  */
 343 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 344                                     const struct tomoyo_name_union *ptr)
 345 {
 346         tomoyo_set_space(head);
 347         if (ptr->group) {
 348                 tomoyo_set_string(head, "@");
 349                 tomoyo_set_string(head, ptr->group->group_name->name);
 350         } else {
 351                 tomoyo_set_string(head, ptr->filename->name);
 352         }
 353 }
 354
 355 /**
 356  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 357  *
 358  * @head: Pointer to "struct tomoyo_io_buffer".
 359  * @ptr:  Pointer to "struct tomoyo_number_union".
 360  *
 361  * Returns nothing.
 362  */
 363 static void tomoyo_print_number_union_nospace
 364 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 365 {
 366         if (ptr->group) {
 367                 tomoyo_set_string(head, "@");
 368                 tomoyo_set_string(head, ptr->group->group_name->name);
 369         } else {
 370                 int i;
 371                 unsigned long min = ptr->values[0];
 372                 const unsigned long max = ptr->values[1];
 373                 u8 min_type = ptr->value_type[0];
 374                 const u8 max_type = ptr->value_type[1];
 375                 char buffer[128];
 376                 buffer[0] = '\0';
 377                 for (i = 0; i < 2; i++) {
 378                         switch (min_type) {
 379                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 380                                 tomoyo_addprintf(buffer, sizeof(buffer),
 381                                                  "0x%lX", min);
 382                                 break;
 383                         case TOMOYO_VALUE_TYPE_OCTAL:
 384                                 tomoyo_addprintf(buffer, sizeof(buffer),
 385                                                  "0%lo", min);
 386                                 break;
 387                         default:
 388                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 389                                                  min);
 390                                 break;
 391                         }
 392                         if (min == max && min_type == max_type)
 393                                 break;
 394                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 395                         min_type = max_type;
 396                         min = max;
 397                 }
 398                 tomoyo_io_printf(head, "%s", buffer);
 399         }
 400 }
 401
 402 /**
 403  * tomoyo_print_number_union - Print a tomoyo_number_union.
 404  *
 405  * @head: Pointer to "struct tomoyo_io_buffer".
 406  * @ptr:  Pointer to "struct tomoyo_number_union".
 407  *
 408  * Returns nothing.
 409  */
 410 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 411                                       const struct tomoyo_number_union *ptr)
 412 {
 413         tomoyo_set_space(head);
 414         tomoyo_print_number_union_nospace(head, ptr);
 415 }
 416
 417 /**
 418  * tomoyo_assign_profile - Create a new profile.
 419  *
 420  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 421  * @profile: Profile number to create.
 422  *
 423  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 424  */
 425 static struct tomoyo_profile *tomoyo_assign_profile
 426 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
 427 {
 428         struct tomoyo_profile *ptr;
 429         struct tomoyo_profile *entry;
 430         if (profile >= TOMOYO_MAX_PROFILES)
 431                 return NULL;
 432         ptr = ns->profile_ptr[profile];
 433         if (ptr)
 434                 return ptr;
 435         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 436         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 437                 goto out;
 438         ptr = ns->profile_ptr[profile];
 439         if (!ptr && tomoyo_memory_ok(entry)) {
 440                 ptr = entry;
 441                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 442                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 443                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 444                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 445                        sizeof(ptr->config));
 446                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
 447                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
 448                 mb(); /* Avoid out-of-order execution. */
 449                 ns->profile_ptr[profile] = ptr;
 450                 entry = NULL;
 451         }
 452         mutex_unlock(&tomoyo_policy_lock);
 453  out:
 454         kfree(entry);
 455         return ptr;
 456 }
 457
 458 /**
 459  * tomoyo_profile - Find a profile.
 460  *
 461  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 462  * @profile: Profile number to find.
 463  *
 464  * Returns pointer to "struct tomoyo_profile".
 465  */
 466 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 467                                       const u8 profile)
 468 {
 469         static struct tomoyo_profile tomoyo_null_profile;
 470         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 471         if (!ptr)
 472                 ptr = &tomoyo_null_profile;
 473         return ptr;
 474 }
 475
 476 /**
 477  * tomoyo_find_yesno - Find values for specified keyword.
 478  *
 479  * @string: String to check.
 480  * @find:   Name of keyword.
 481  *
 482  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 483  */
 484 static s8 tomoyo_find_yesno(const char *string, const char *find)
 485 {
 486         const char *cp = strstr(string, find);
 487         if (cp) {
 488                 cp += strlen(find);
 489                 if (!strncmp(cp, "=yes", 4))
 490                         return 1;
 491                 else if (!strncmp(cp, "=no", 3))
 492                         return 0;
 493         }
 494         return -1;
 495 }
 496
 497 /**
 498  * tomoyo_set_uint - Set value for specified preference.
 499  *
 500  * @i:      Pointer to "unsigned int".
 501  * @string: String to check.
 502  * @find:   Name of keyword.
 503  *
 504  * Returns nothing.
 505  */
 506 static void tomoyo_set_uint(unsigned int *i, const char *string,
 507                             const char *find)
 508 {
 509         const char *cp = strstr(string, find);
 510         if (cp)
 511                 sscanf(cp + strlen(find), "=%u", i);
 512 }
 513
 514 /**
 515  * tomoyo_set_mode - Set mode for specified profile.
 516  *
 517  * @name:    Name of functionality.
 518  * @value:   Mode for @name.
 519  * @profile: Pointer to "struct tomoyo_profile".
 520  *
 521  * Returns 0 on success, negative value otherwise.
 522  */
 523 static int tomoyo_set_mode(char *name, const char *value,
 524                            struct tomoyo_profile *profile)
 525 {
 526         u8 i;
 527         u8 config;
 528         if (!strcmp(name, "CONFIG")) {
 529                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 530                 config = profile->default_config;
 531         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 532                 config = 0;
 533                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 534                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 535                         int len = 0;
 536                         if (i < TOMOYO_MAX_MAC_INDEX) {
 537                                 const u8 c = tomoyo_index2category[i];
 538                                 const char *category =
 539                                         tomoyo_category_keywords[c];
 540                                 len = strlen(category);
 541                                 if (strncmp(name, category, len) ||
 542                                     name[len++] != ':' || name[len++] != ':')
 543                                         continue;
 544                         }
 545                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
 546                                 continue;
 547                         config = profile->config[i];
 548                         break;
 549                 }
 550                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 551                         return -EINVAL;
 552         } else {
 553                 return -EINVAL;
 554         }
 555         if (strstr(value, "use_default")) {
 556                 config = TOMOYO_CONFIG_USE_DEFAULT;
 557         } else {
 558                 u8 mode;
 559                 for (mode = 0; mode < 4; mode++)
 560                         if (strstr(value, tomoyo_mode[mode]))
 561                                 /*
 562                                  * Update lower 3 bits in order to distinguish
 563                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 564                                  */
 565                                 config = (config & ~7) | mode;
 566                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 567                         switch (tomoyo_find_yesno(value, "grant_log")) {
 568                         case 1:
 569                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 570                                 break;
 571                         case 0:
 572                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 573                                 break;
 574                         }
 575                         switch (tomoyo_find_yesno(value, "reject_log")) {
 576                         case 1:
 577                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 578                                 break;
 579                         case 0:
 580                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 581                                 break;
 582                         }
 583                 }
 584         }
 585         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 586                 profile->config[i] = config;
 587         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 588                 profile->default_config = config;
 589         return 0;
 590 }
 591
 592 /**
 593  * tomoyo_write_profile - Write profile table.
 594  *
 595  * @head: Pointer to "struct tomoyo_io_buffer".
 596  *
 597  * Returns 0 on success, negative value otherwise.
 598  */
 599 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 600 {
 601         char *data = head->write_buf;
 602         unsigned int i;
 603         char *cp;
 604         struct tomoyo_profile *profile;
 605         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 606             == 1)
 607                 return 0;
 608         i = simple_strtoul(data, &cp, 10);
 609         if (*cp != '-')
 610                 return -EINVAL;
 611         data = cp + 1;
 612         profile = tomoyo_assign_profile(head->w.ns, i);
 613         if (!profile)
 614                 return -EINVAL;
 615         cp = strchr(data, '=');
 616         if (!cp)
 617                 return -EINVAL;
 618         *cp++ = '\0';
 619         if (!strcmp(data, "COMMENT")) {
 620                 static DEFINE_SPINLOCK(lock);
 621                 const struct tomoyo_path_info *new_comment
 622                         = tomoyo_get_name(cp);
 623                 const struct tomoyo_path_info *old_comment;
 624                 if (!new_comment)
 625                         return -ENOMEM;
 626                 spin_lock(&lock);
 627                 old_comment = profile->comment;
 628                 profile->comment = new_comment;
 629                 spin_unlock(&lock);
 630                 tomoyo_put_name(old_comment);
 631                 return 0;
 632         }
 633         if (!strcmp(data, "PREFERENCE")) {
 634                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 635                         tomoyo_set_uint(&profile->pref[i], cp,
 636                                         tomoyo_pref_keywords[i]);
 637                 return 0;
 638         }
 639         return tomoyo_set_mode(data, cp, profile);
 640 }
 641
 642 /**
 643  * tomoyo_print_config - Print mode for specified functionality.
 644  *
 645  * @head:   Pointer to "struct tomoyo_io_buffer".
 646  * @config: Mode for that functionality.
 647  *
 648  * Returns nothing.
 649  *
 650  * Caller prints functionality's name.
 651  */
 652 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 653 {
 654         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 655                          tomoyo_mode[config & 3],
 656                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 657                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 658 }
 659
 660 /**
 661  * tomoyo_read_profile - Read profile table.
 662  *
 663  * @head: Pointer to "struct tomoyo_io_buffer".
 664  *
 665  * Returns nothing.
 666  */
 667 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 668 {
 669         u8 index;
 670         struct tomoyo_policy_namespace *ns =
 671                 container_of(head->r.ns, typeof(*ns), namespace_list);
 672         const struct tomoyo_profile *profile;
 673         if (head->r.eof)
 674                 return;
 675  next:
 676         index = head->r.index;
 677         profile = ns->profile_ptr[index];
 678         switch (head->r.step) {
 679         case 0:
 680                 tomoyo_print_namespace(head);
 681                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 682                                  ns->profile_version);
 683                 head->r.step++;
 684                 break;
 685         case 1:
 686                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 687                       head->r.index++)
 688                         if (ns->profile_ptr[head->r.index])
 689                                 break;
 690                 if (head->r.index == TOMOYO_MAX_PROFILES)
 691                         return;
 692                 head->r.step++;
 693                 break;
 694         case 2:
 695                 {
 696                         u8 i;
 697                         const struct tomoyo_path_info *comment =
 698                                 profile->comment;
 699                         tomoyo_print_namespace(head);
 700                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 701                         tomoyo_set_string(head, comment ? comment->name : "");
 702                         tomoyo_set_lf(head);
 703                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 704                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 705                                 tomoyo_io_printf(head, "%s=%u ",
 706                                                  tomoyo_pref_keywords[i],
 707                                                  profile->pref[i]);
 708                         tomoyo_set_string(head, "}\n");
 709                         head->r.step++;
 710                 }
 711                 break;
 712         case 3:
 713                 {
 714                         tomoyo_print_namespace(head);
 715                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 716                         tomoyo_print_config(head, profile->default_config);
 717                         head->r.bit = 0;
 718                         head->r.step++;
 719                 }
 720                 break;
 721         case 4:
 722                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 723                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 724                         const u8 i = head->r.bit;
 725                         const u8 config = profile->config[i];
 726                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 727                                 continue;
 728                         tomoyo_print_namespace(head);
 729                         if (i < TOMOYO_MAX_MAC_INDEX)
 730                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 731                                                  index,
 732                                                  tomoyo_category_keywords
 733                                                  [tomoyo_index2category[i]],
 734                                                  tomoyo_mac_keywords[i]);
 735                         else
 736                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 737                                                  tomoyo_mac_keywords[i]);
 738                         tomoyo_print_config(head, config);
 739                         head->r.bit++;
 740                         break;
 741                 }
 742                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 743                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 744                         head->r.index++;
 745                         head->r.step = 1;
 746                 }
 747                 break;
 748         }
 749         if (tomoyo_flush(head))
 750                 goto next;
 751 }
 752
 753 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 754                                 const struct tomoyo_acl_head *b)
 755 {
 756         return container_of(a, struct tomoyo_manager, head)->manager ==
 757                 container_of(b, struct tomoyo_manager, head)->manager;
 758 }
 759
 760 /**
 761  * tomoyo_update_manager_entry - Add a manager entry.
 762  *
 763  * @manager:   The path to manager or the domainnamme.
 764  * @is_delete: True if it is a delete request.
 765  *
 766  * Returns 0 on success, negative value otherwise.
 767  *
 768  * Caller holds tomoyo_read_lock().
 769  */
 770 static int tomoyo_update_manager_entry(const char *manager,
 771                                        const bool is_delete)
 772 {
 773         struct tomoyo_manager e = { };
 774         struct tomoyo_acl_param param = {
 775                 /* .ns = &tomoyo_kernel_namespace, */
 776                 .is_delete = is_delete,
 777                 .list = &tomoyo_kernel_namespace.
 778                 policy_list[TOMOYO_ID_MANAGER],
 779         };
 780         int error = is_delete ? -ENOENT : -ENOMEM;
 781         if (tomoyo_domain_def(manager)) {
 782                 if (!tomoyo_correct_domain(manager))
 783                         return -EINVAL;
 784                 e.is_domain = true;
 785         } else {
 786                 if (!tomoyo_correct_path(manager))
 787                         return -EINVAL;
 788         }
 789         e.manager = tomoyo_get_name(manager);
 790         if (e.manager) {
 791                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 792                                              tomoyo_same_manager);
 793                 tomoyo_put_name(e.manager);
 794         }
 795         return error;
 796 }
 797
 798 /**
 799  * tomoyo_write_manager - Write manager policy.
 800  *
 801  * @head: Pointer to "struct tomoyo_io_buffer".
 802  *
 803  * Returns 0 on success, negative value otherwise.
 804  *
 805  * Caller holds tomoyo_read_lock().
 806  */
 807 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 808 {
 809         char *data = head->write_buf;
 810
 811         if (!strcmp(data, "manage_by_non_root")) {
 812                 tomoyo_manage_by_non_root = !head->w.is_delete;
 813                 return 0;
 814         }
 815         return tomoyo_update_manager_entry(data, head->w.is_delete);
 816 }
 817
 818 /**
 819  * tomoyo_read_manager - Read manager policy.
 820  *
 821  * @head: Pointer to "struct tomoyo_io_buffer".
 822  *
 823  * Caller holds tomoyo_read_lock().
 824  */
 825 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 826 {
 827         if (head->r.eof)
 828                 return;
 829         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
 830                              policy_list[TOMOYO_ID_MANAGER]) {
 831                 struct tomoyo_manager *ptr =
 832                         list_entry(head->r.acl, typeof(*ptr), head.list);
 833                 if (ptr->head.is_deleted)
 834                         continue;
 835                 if (!tomoyo_flush(head))
 836                         return;
 837                 tomoyo_set_string(head, ptr->manager->name);
 838                 tomoyo_set_lf(head);
 839         }
 840         head->r.eof = true;
 841 }
 842
 843 /**
 844  * tomoyo_manager - Check whether the current process is a policy manager.
 845  *
 846  * Returns true if the current process is permitted to modify policy
 847  * via /sys/kernel/security/tomoyo/ interface.
 848  *
 849  * Caller holds tomoyo_read_lock().
 850  */
 851 static bool tomoyo_manager(void)
 852 {
 853         struct tomoyo_manager *ptr;
 854         const char *exe;
 855         const struct task_struct *task = current;
 856         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 857         bool found = false;
 858
 859         if (!tomoyo_policy_loaded)
 860                 return true;
 861         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 862                 return false;
 863         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 864                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 865                 if (!ptr->head.is_deleted && ptr->is_domain
 866                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 867                         found = true;
 868                         break;
 869                 }
 870         }
 871         if (found)
 872                 return true;
 873         exe = tomoyo_get_exe();
 874         if (!exe)
 875                 return false;
 876         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 877                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 878                 if (!ptr->head.is_deleted && !ptr->is_domain
 879                     && !strcmp(exe, ptr->manager->name)) {
 880                         found = true;
 881                         break;
 882                 }
 883         }
 884         if (!found) { /* Reduce error messages. */
 885                 static pid_t last_pid;
 886                 const pid_t pid = current->pid;
 887                 if (last_pid != pid) {
 888                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 889                                "update policies.\n", domainname->name, exe);
 890                         last_pid = pid;
 891                 }
 892         }
 893         kfree(exe);
 894         return found;
 895 }
 896
 897 /**
 898  * tomoyo_select_domain - Parse select command.
 899  *
 900  * @head: Pointer to "struct tomoyo_io_buffer".
 901  * @data: String to parse.
 902  *
 903  * Returns true on success, false otherwise.
 904  *
 905  * Caller holds tomoyo_read_lock().
 906  */
 907 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 908                                  const char *data)
 909 {
 910         unsigned int pid;
 911         struct tomoyo_domain_info *domain = NULL;
 912         bool global_pid = false;
 913         if (strncmp(data, "select ", 7))
 914                 return false;
 915         data += 7;
 916         if (sscanf(data, "pid=%u", &pid) == 1 ||
 917             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 918                 struct task_struct *p;
 919                 rcu_read_lock();
 920                 read_lock(&tasklist_lock);
 921                 if (global_pid)
 922                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 923                 else
 924                         p = find_task_by_vpid(pid);
 925                 if (p)
 926                         domain = tomoyo_real_domain(p);
 927                 read_unlock(&tasklist_lock);
 928                 rcu_read_unlock();
 929         } else if (!strncmp(data, "domain=", 7)) {
 930                 if (tomoyo_domain_def(data + 7))
 931                         domain = tomoyo_find_domain(data + 7);
 932         } else
 933                 return false;
 934         head->w.domain = domain;
 935         /* Accessing read_buf is safe because head->io_sem is held. */
 936         if (!head->read_buf)
 937                 return true; /* Do nothing if open(O_WRONLY). */
 938         memset(&head->r, 0, sizeof(head->r));
 939         head->r.print_this_domain_only = true;
 940         if (domain)
 941                 head->r.domain = &domain->list;
 942         else
 943                 head->r.eof = 1;
 944         tomoyo_io_printf(head, "# select %s\n", data);
 945         if (domain && domain->is_deleted)
 946                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 947         return true;
 948 }
 949
 950 /**
 951  * tomoyo_delete_domain - Delete a domain.
 952  *
 953  * @domainname: The name of domain.
 954  *
 955  * Returns 0.
 956  *
 957  * Caller holds tomoyo_read_lock().
 958  */
 959 static int tomoyo_delete_domain(char *domainname)
 960 {
 961         struct tomoyo_domain_info *domain;
 962         struct tomoyo_path_info name;
 963
 964         name.name = domainname;
 965         tomoyo_fill_path_info(&name);
 966         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 967                 return 0;
 968         /* Is there an active domain? */
 969         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 970                 /* Never delete tomoyo_kernel_domain */
 971                 if (domain == &tomoyo_kernel_domain)
 972                         continue;
 973                 if (domain->is_deleted ||
 974                     tomoyo_pathcmp(domain->domainname, &name))
 975                         continue;
 976                 domain->is_deleted = true;
 977                 break;
 978         }
 979         mutex_unlock(&tomoyo_policy_lock);
 980         return 0;
 981 }
 982
 983 /**
 984  * tomoyo_write_domain2 - Write domain policy.
 985  *
 986  * @ns:        Pointer to "struct tomoyo_policy_namespace".
 987  * @list:      Pointer to "struct list_head".
 988  * @data:      Policy to be interpreted.
 989  * @is_delete: True if it is a delete request.
 990  *
 991  * Returns 0 on success, negative value otherwise.
 992  *
 993  * Caller holds tomoyo_read_lock().
 994  */
 995 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
 996                                 struct list_head *list, char *data,
 997                                 const bool is_delete)
 998 {
 999         struct tomoyo_acl_param param = {
1000                 .ns = ns,
1001                 .list = list,
1002                 .data = data,
1003                 .is_delete = is_delete,
1004         };
1005         static const struct {
1006                 const char *keyword;
1007                 int (*write) (struct tomoyo_acl_param *);
1008         } tomoyo_callback[1] = {
1009                 { "file ", tomoyo_write_file },
1010         };
1011         u8 i;
1012         for (i = 0; i < 1; i++) {
1013                 if (!tomoyo_str_starts(&param.data,
1014                                        tomoyo_callback[i].keyword))
1015                         continue;
1016                 return tomoyo_callback[i].write(&param);
1017         }
1018         return -EINVAL;
1019 }
1020
1021 /* String table for domain flags. */
1022 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1023         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1024         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1025 };
1026
1027 /**
1028  * tomoyo_write_domain - Write domain policy.
1029  *
1030  * @head: Pointer to "struct tomoyo_io_buffer".
1031  *
1032  * Returns 0 on success, negative value otherwise.
1033  *
1034  * Caller holds tomoyo_read_lock().
1035  */
1036 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1037 {
1038         char *data = head->write_buf;
1039         struct tomoyo_policy_namespace *ns;
1040         struct tomoyo_domain_info *domain = head->w.domain;
1041         const bool is_delete = head->w.is_delete;
1042         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1043         unsigned int profile;
1044         if (*data == '<') {
1045                 domain = NULL;
1046                 if (is_delete)
1047                         tomoyo_delete_domain(data);
1048                 else if (is_select)
1049                         domain = tomoyo_find_domain(data);
1050                 else
1051                         domain = tomoyo_assign_domain(data, false);
1052                 head->w.domain = domain;
1053                 return 0;
1054         }
1055         if (!domain)
1056                 return -EINVAL;
1057         ns = domain->ns;
1058         if (sscanf(data, "use_profile %u", &profile) == 1
1059             && profile < TOMOYO_MAX_PROFILES) {
1060                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1061                         domain->profile = (u8) profile;
1062                 return 0;
1063         }
1064         if (sscanf(data, "use_group %u\n", &profile) == 1
1065             && profile < TOMOYO_MAX_ACL_GROUPS) {
1066                 if (!is_delete)
1067                         domain->group = (u8) profile;
1068                 return 0;
1069         }
1070         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1071                 const char *cp = tomoyo_dif[profile];
1072                 if (strncmp(data, cp, strlen(cp) - 1))
1073                         continue;
1074                 domain->flags[profile] = !is_delete;
1075                 return 0;
1076         }
1077         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1078                                     is_delete);
1079 }
1080
1081 /**
1082  * tomoyo_print_condition - Print condition part.
1083  *
1084  * @head: Pointer to "struct tomoyo_io_buffer".
1085  * @cond: Pointer to "struct tomoyo_condition".
1086  *
1087  * Returns true on success, false otherwise.
1088  */
1089 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1090                                    const struct tomoyo_condition *cond)
1091 {
1092         switch (head->r.cond_step) {
1093         case 0:
1094                 head->r.cond_index = 0;
1095                 head->r.cond_step++;
1096                 /* fall through */
1097         case 1:
1098                 {
1099                         const u16 condc = cond->condc;
1100                         const struct tomoyo_condition_element *condp =
1101                                 (typeof(condp)) (cond + 1);
1102                         const struct tomoyo_number_union *numbers_p =
1103                                 (typeof(numbers_p)) (condp + condc);
1104                         u16 skip;
1105                         for (skip = 0; skip < head->r.cond_index; skip++) {
1106                                 const u8 left = condp->left;
1107                                 const u8 right = condp->right;
1108                                 condp++;
1109                                 switch (left) {
1110                                 case TOMOYO_NUMBER_UNION:
1111                                         numbers_p++;
1112                                         break;
1113                                 }
1114                                 switch (right) {
1115                                 case TOMOYO_NUMBER_UNION:
1116                                         numbers_p++;
1117                                         break;
1118                                 }
1119                         }
1120                         while (head->r.cond_index < condc) {
1121                                 const u8 match = condp->equals;
1122                                 const u8 left = condp->left;
1123                                 const u8 right = condp->right;
1124                                 if (!tomoyo_flush(head))
1125                                         return false;
1126                                 condp++;
1127                                 head->r.cond_index++;
1128                                 tomoyo_set_space(head);
1129                                 switch (left) {
1130                                 case TOMOYO_NUMBER_UNION:
1131                                         tomoyo_print_number_union_nospace
1132                                                 (head, numbers_p++);
1133                                         break;
1134                                 default:
1135                                         tomoyo_set_string(head,
1136                                                tomoyo_condition_keyword[left]);
1137                                         break;
1138                                 }
1139                                 tomoyo_set_string(head, match ? "=" : "!=");
1140                                 switch (right) {
1141                                 case TOMOYO_NUMBER_UNION:
1142                                         tomoyo_print_number_union_nospace
1143                                                 (head, numbers_p++);
1144                                         break;
1145                                 default:
1146                                         tomoyo_set_string(head,
1147                                           tomoyo_condition_keyword[right]);
1148                                         break;
1149                                 }
1150                         }
1151                 }
1152                 head->r.cond_step++;
1153                 /* fall through */
1154         case 2:
1155                 if (!tomoyo_flush(head))
1156                         break;
1157                 head->r.cond_step++;
1158                 /* fall through */
1159         case 3:
1160                 tomoyo_set_lf(head);
1161                 return true;
1162         }
1163         return false;
1164 }
1165
1166 /**
1167  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1168  *
1169  * @head:     Pointer to "struct tomoyo_io_buffer".
1170  * @category: Category name.
1171  *
1172  * Returns nothing.
1173  */
1174 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1175                              const char *category)
1176 {
1177         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1178                 tomoyo_print_namespace(head);
1179                 tomoyo_io_printf(head, "acl_group %u ",
1180                                  head->r.acl_group_index);
1181         }
1182         tomoyo_set_string(head, category);
1183 }
1184
1185 /**
1186  * tomoyo_print_entry - Print an ACL entry.
1187  *
1188  * @head: Pointer to "struct tomoyo_io_buffer".
1189  * @acl:  Pointer to an ACL entry.
1190  *
1191  * Returns true on success, false otherwise.
1192  */
1193 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1194                                struct tomoyo_acl_info *acl)
1195 {
1196         const u8 acl_type = acl->type;
1197         bool first = true;
1198         u8 bit;
1199
1200         if (head->r.print_cond_part)
1201                 goto print_cond_part;
1202         if (acl->is_deleted)
1203                 return true;
1204         if (!tomoyo_flush(head))
1205                 return false;
1206         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1207                 struct tomoyo_path_acl *ptr =
1208                         container_of(acl, typeof(*ptr), head);
1209                 const u16 perm = ptr->perm;
1210                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1211                         if (!(perm & (1 << bit)))
1212                                 continue;
1213                         if (head->r.print_transition_related_only &&
1214                             bit != TOMOYO_TYPE_EXECUTE)
1215                                 continue;
1216                         if (first) {
1217                                 tomoyo_set_group(head, "file ");
1218                                 first = false;
1219                         } else {
1220                                 tomoyo_set_slash(head);
1221                         }
1222                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1223                 }
1224                 if (first)
1225                         return true;
1226                 tomoyo_print_name_union(head, &ptr->name);
1227         } else if (head->r.print_transition_related_only) {
1228                 return true;
1229         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1230                 struct tomoyo_path2_acl *ptr =
1231                         container_of(acl, typeof(*ptr), head);
1232                 const u8 perm = ptr->perm;
1233                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1234                         if (!(perm & (1 << bit)))
1235                                 continue;
1236                         if (first) {
1237                                 tomoyo_set_group(head, "file ");
1238                                 first = false;
1239                         } else {
1240                                 tomoyo_set_slash(head);
1241                         }
1242                         tomoyo_set_string(head, tomoyo_mac_keywords
1243                                           [tomoyo_pp2mac[bit]]);
1244                 }
1245                 if (first)
1246                         return true;
1247                 tomoyo_print_name_union(head, &ptr->name1);
1248                 tomoyo_print_name_union(head, &ptr->name2);
1249         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1250                 struct tomoyo_path_number_acl *ptr =
1251                         container_of(acl, typeof(*ptr), head);
1252                 const u8 perm = ptr->perm;
1253                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1254                         if (!(perm & (1 << bit)))
1255                                 continue;
1256                         if (first) {
1257                                 tomoyo_set_group(head, "file ");
1258                                 first = false;
1259                         } else {
1260                                 tomoyo_set_slash(head);
1261                         }
1262                         tomoyo_set_string(head, tomoyo_mac_keywords
1263                                           [tomoyo_pn2mac[bit]]);
1264                 }
1265                 if (first)
1266                         return true;
1267                 tomoyo_print_name_union(head, &ptr->name);
1268                 tomoyo_print_number_union(head, &ptr->number);
1269         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1270                 struct tomoyo_mkdev_acl *ptr =
1271                         container_of(acl, typeof(*ptr), head);
1272                 const u8 perm = ptr->perm;
1273                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1274                         if (!(perm & (1 << bit)))
1275                                 continue;
1276                         if (first) {
1277                                 tomoyo_set_group(head, "file ");
1278                                 first = false;
1279                         } else {
1280                                 tomoyo_set_slash(head);
1281                         }
1282                         tomoyo_set_string(head, tomoyo_mac_keywords
1283                                           [tomoyo_pnnn2mac[bit]]);
1284                 }
1285                 if (first)
1286                         return true;
1287                 tomoyo_print_name_union(head, &ptr->name);
1288                 tomoyo_print_number_union(head, &ptr->mode);
1289                 tomoyo_print_number_union(head, &ptr->major);
1290                 tomoyo_print_number_union(head, &ptr->minor);
1291         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1292                 struct tomoyo_mount_acl *ptr =
1293                         container_of(acl, typeof(*ptr), head);
1294                 tomoyo_set_group(head, "file mount");
1295                 tomoyo_print_name_union(head, &ptr->dev_name);
1296                 tomoyo_print_name_union(head, &ptr->dir_name);
1297                 tomoyo_print_name_union(head, &ptr->fs_type);
1298                 tomoyo_print_number_union(head, &ptr->flags);
1299         }
1300         if (acl->cond) {
1301                 head->r.print_cond_part = true;
1302                 head->r.cond_step = 0;
1303                 if (!tomoyo_flush(head))
1304                         return false;
1305 print_cond_part:
1306                 if (!tomoyo_print_condition(head, acl->cond))
1307                         return false;
1308                 head->r.print_cond_part = false;
1309         } else {
1310                 tomoyo_set_lf(head);
1311         }
1312         return true;
1313 }
1314
1315 /**
1316  * tomoyo_read_domain2 - Read domain policy.
1317  *
1318  * @head: Pointer to "struct tomoyo_io_buffer".
1319  * @list: Pointer to "struct list_head".
1320  *
1321  * Caller holds tomoyo_read_lock().
1322  *
1323  * Returns true on success, false otherwise.
1324  */
1325 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1326                                 struct list_head *list)
1327 {
1328         list_for_each_cookie(head->r.acl, list) {
1329                 struct tomoyo_acl_info *ptr =
1330                         list_entry(head->r.acl, typeof(*ptr), list);
1331                 if (!tomoyo_print_entry(head, ptr))
1332                         return false;
1333         }
1334         head->r.acl = NULL;
1335         return true;
1336 }
1337
1338 /**
1339  * tomoyo_read_domain - Read domain policy.
1340  *
1341  * @head: Pointer to "struct tomoyo_io_buffer".
1342  *
1343  * Caller holds tomoyo_read_lock().
1344  */
1345 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1346 {
1347         if (head->r.eof)
1348                 return;
1349         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1350                 struct tomoyo_domain_info *domain =
1351                         list_entry(head->r.domain, typeof(*domain), list);
1352                 switch (head->r.step) {
1353                         u8 i;
1354                 case 0:
1355                         if (domain->is_deleted &&
1356                             !head->r.print_this_domain_only)
1357                                 continue;
1358                         /* Print domainname and flags. */
1359                         tomoyo_set_string(head, domain->domainname->name);
1360                         tomoyo_set_lf(head);
1361                         tomoyo_io_printf(head, "use_profile %u\n",
1362                                          domain->profile);
1363                         tomoyo_io_printf(head, "use_group %u\n",
1364                                          domain->group);
1365                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1366                                 if (domain->flags[i])
1367                                         tomoyo_set_string(head, tomoyo_dif[i]);
1368                         head->r.step++;
1369                         tomoyo_set_lf(head);
1370                         /* fall through */
1371                 case 1:
1372                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1373                                 return;
1374                         head->r.step++;
1375                         if (!tomoyo_set_lf(head))
1376                                 return;
1377                         /* fall through */
1378                 case 2:
1379                         head->r.step = 0;
1380                         if (head->r.print_this_domain_only)
1381                                 goto done;
1382                 }
1383         }
1384  done:
1385         head->r.eof = true;
1386 }
1387
1388 /**
1389  * tomoyo_write_pid: Specify PID to obtain domainname.
1390  *
1391  * @head: Pointer to "struct tomoyo_io_buffer".
1392  *
1393  * Returns 0.
1394  */
1395 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1396 {
1397         head->r.eof = false;
1398         return 0;
1399 }
1400
1401 /**
1402  * tomoyo_read_pid - Get domainname of the specified PID.
1403  *
1404  * @head: Pointer to "struct tomoyo_io_buffer".
1405  *
1406  * Returns the domainname which the specified PID is in on success,
1407  * empty string otherwise.
1408  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1409  * using read()/write() interface rather than sysctl() interface.
1410  */
1411 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1412 {
1413         char *buf = head->write_buf;
1414         bool global_pid = false;
1415         unsigned int pid;
1416         struct task_struct *p;
1417         struct tomoyo_domain_info *domain = NULL;
1418
1419         /* Accessing write_buf is safe because head->io_sem is held. */
1420         if (!buf) {
1421                 head->r.eof = true;
1422                 return; /* Do nothing if open(O_RDONLY). */
1423         }
1424         if (head->r.w_pos || head->r.eof)
1425                 return;
1426         head->r.eof = true;
1427         if (tomoyo_str_starts(&buf, "global-pid "))
1428                 global_pid = true;
1429         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1430         rcu_read_lock();
1431         read_lock(&tasklist_lock);
1432         if (global_pid)
1433                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1434         else
1435                 p = find_task_by_vpid(pid);
1436         if (p)
1437                 domain = tomoyo_real_domain(p);
1438         read_unlock(&tasklist_lock);
1439         rcu_read_unlock();
1440         if (!domain)
1441                 return;
1442         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1443         tomoyo_set_string(head, domain->domainname->name);
1444 }
1445
1446 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1447         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1448         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1449         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1450         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1451         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1452         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1453 };
1454
1455 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1456         [TOMOYO_PATH_GROUP]   = "path_group ",
1457         [TOMOYO_NUMBER_GROUP] = "number_group ",
1458 };
1459
1460 /**
1461  * tomoyo_write_exception - Write exception policy.
1462  *
1463  * @head: Pointer to "struct tomoyo_io_buffer".
1464  *
1465  * Returns 0 on success, negative value otherwise.
1466  *
1467  * Caller holds tomoyo_read_lock().
1468  */
1469 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1470 {
1471         const bool is_delete = head->w.is_delete;
1472         struct tomoyo_acl_param param = {
1473                 .ns = head->w.ns,
1474                 .is_delete = is_delete,
1475                 .data = head->write_buf,
1476         };
1477         u8 i;
1478         if (tomoyo_str_starts(&param.data, "aggregator "))
1479                 return tomoyo_write_aggregator(&param);
1480         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1481                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1482                         return tomoyo_write_transition_control(&param, i);
1483         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1484                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1485                         return tomoyo_write_group(&param, i);
1486         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1487                 unsigned int group;
1488                 char *data;
1489                 group = simple_strtoul(param.data, &data, 10);
1490                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1491                         return tomoyo_write_domain2
1492                                 (head->w.ns, &head->w.ns->acl_group[group],
1493                                  data, is_delete);
1494         }
1495         return -EINVAL;
1496 }
1497
1498 /**
1499  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1500  *
1501  * @head: Pointer to "struct tomoyo_io_buffer".
1502  * @idx:  Index number.
1503  *
1504  * Returns true on success, false otherwise.
1505  *
1506  * Caller holds tomoyo_read_lock().
1507  */
1508 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1509 {
1510         struct tomoyo_policy_namespace *ns =
1511                 container_of(head->r.ns, typeof(*ns), namespace_list);
1512         struct list_head *list = &ns->group_list[idx];
1513         list_for_each_cookie(head->r.group, list) {
1514                 struct tomoyo_group *group =
1515                         list_entry(head->r.group, typeof(*group), head.list);
1516                 list_for_each_cookie(head->r.acl, &group->member_list) {
1517                         struct tomoyo_acl_head *ptr =
1518                                 list_entry(head->r.acl, typeof(*ptr), list);
1519                         if (ptr->is_deleted)
1520                                 continue;
1521                         if (!tomoyo_flush(head))
1522                                 return false;
1523                         tomoyo_print_namespace(head);
1524                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1525                         tomoyo_set_string(head, group->group_name->name);
1526                         if (idx == TOMOYO_PATH_GROUP) {
1527                                 tomoyo_set_space(head);
1528                                 tomoyo_set_string(head, container_of
1529                                                (ptr, struct tomoyo_path_group,
1530                                                 head)->member_name->name);
1531                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1532                                 tomoyo_print_number_union(head, &container_of
1533                                                           (ptr,
1534                                                    struct tomoyo_number_group,
1535                                                            head)->number);
1536                         }
1537                         tomoyo_set_lf(head);
1538                 }
1539                 head->r.acl = NULL;
1540         }
1541         head->r.group = NULL;
1542         return true;
1543 }
1544
1545 /**
1546  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1547  *
1548  * @head: Pointer to "struct tomoyo_io_buffer".
1549  * @idx:  Index number.
1550  *
1551  * Returns true on success, false otherwise.
1552  *
1553  * Caller holds tomoyo_read_lock().
1554  */
1555 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1556 {
1557         struct tomoyo_policy_namespace *ns =
1558                 container_of(head->r.ns, typeof(*ns), namespace_list);
1559         struct list_head *list = &ns->policy_list[idx];
1560         list_for_each_cookie(head->r.acl, list) {
1561                 struct tomoyo_acl_head *acl =
1562                         container_of(head->r.acl, typeof(*acl), list);
1563                 if (acl->is_deleted)
1564                         continue;
1565                 if (!tomoyo_flush(head))
1566                         return false;
1567                 switch (idx) {
1568                 case TOMOYO_ID_TRANSITION_CONTROL:
1569                         {
1570                                 struct tomoyo_transition_control *ptr =
1571                                         container_of(acl, typeof(*ptr), head);
1572                                 tomoyo_print_namespace(head);
1573                                 tomoyo_set_string(head, tomoyo_transition_type
1574                                                   [ptr->type]);
1575                                 tomoyo_set_string(head, ptr->program ?
1576                                                   ptr->program->name : "any");
1577                                 tomoyo_set_string(head, " from ");
1578                                 tomoyo_set_string(head, ptr->domainname ?
1579                                                   ptr->domainname->name :
1580                                                   "any");
1581                         }
1582                         break;
1583                 case TOMOYO_ID_AGGREGATOR:
1584                         {
1585                                 struct tomoyo_aggregator *ptr =
1586                                         container_of(acl, typeof(*ptr), head);
1587                                 tomoyo_print_namespace(head);
1588                                 tomoyo_set_string(head, "aggregator ");
1589                                 tomoyo_set_string(head,
1590                                                   ptr->original_name->name);
1591                                 tomoyo_set_space(head);
1592                                 tomoyo_set_string(head,
1593                                                ptr->aggregated_name->name);
1594                         }
1595                         break;
1596                 default:
1597                         continue;
1598                 }
1599                 tomoyo_set_lf(head);
1600         }
1601         head->r.acl = NULL;
1602         return true;
1603 }
1604
1605 /**
1606  * tomoyo_read_exception - Read exception policy.
1607  *
1608  * @head: Pointer to "struct tomoyo_io_buffer".
1609  *
1610  * Caller holds tomoyo_read_lock().
1611  */
1612 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1613 {
1614         struct tomoyo_policy_namespace *ns =
1615                 container_of(head->r.ns, typeof(*ns), namespace_list);
1616         if (head->r.eof)
1617                 return;
1618         while (head->r.step < TOMOYO_MAX_POLICY &&
1619                tomoyo_read_policy(head, head->r.step))
1620                 head->r.step++;
1621         if (head->r.step < TOMOYO_MAX_POLICY)
1622                 return;
1623         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1624                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1625                 head->r.step++;
1626         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1627                 return;
1628         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1629                + TOMOYO_MAX_ACL_GROUPS) {
1630                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1631                         - TOMOYO_MAX_GROUP;
1632                 if (!tomoyo_read_domain2(head, &ns->acl_group
1633                                          [head->r.acl_group_index]))
1634                         return;
1635                 head->r.step++;
1636         }
1637         head->r.eof = true;
1638 }
1639
1640 /* Wait queue for kernel -> userspace notification. */
1641 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1642 /* Wait queue for userspace -> kernel notification. */
1643 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1644
1645 /* Structure for query. */
1646 struct tomoyo_query {
1647         struct list_head list;
1648         char *query;
1649         size_t query_len;
1650         unsigned int serial;
1651         u8 timer;
1652         u8 answer;
1653         u8 retry;
1654 };
1655
1656 /* The list for "struct tomoyo_query". */
1657 static LIST_HEAD(tomoyo_query_list);
1658
1659 /* Lock for manipulating tomoyo_query_list. */
1660 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1661
1662 /*
1663  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1664  * interface.
1665  */
1666 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1667
1668 /**
1669  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1670  *
1671  * @domain: Pointer to "struct tomoyo_domain_info".
1672  * @header: Lines containing ACL.
1673  *
1674  * Returns nothing.
1675  */
1676 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1677 {
1678         char *buffer;
1679         char *cp = strchr(header, '\n');
1680         int len;
1681         if (!cp)
1682                 return;
1683         cp = strchr(cp + 1, '\n');
1684         if (!cp)
1685                 return;
1686         *cp++ = '\0';
1687         len = strlen(cp) + 1;
1688         buffer = kmalloc(len, GFP_NOFS);
1689         if (!buffer)
1690                 return;
1691         snprintf(buffer, len - 1, "%s", cp);
1692         tomoyo_normalize_line(buffer);
1693         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1694                                   false))
1695                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1696         kfree(buffer);
1697 }
1698
1699 /**
1700  * tomoyo_supervisor - Ask for the supervisor's decision.
1701  *
1702  * @r:   Pointer to "struct tomoyo_request_info".
1703  * @fmt: The printf()'s format string, followed by parameters.
1704  *
1705  * Returns 0 if the supervisor decided to permit the access request which
1706  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1707  * supervisor decided to retry the access request which violated the policy in
1708  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1709  */
1710 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1711 {
1712         va_list args;
1713         int error;
1714         int len;
1715         static unsigned int tomoyo_serial;
1716         struct tomoyo_query entry = { };
1717         bool quota_exceeded = false;
1718         va_start(args, fmt);
1719         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
1720         va_end(args);
1721         /* Write /sys/kernel/security/tomoyo/audit. */
1722         va_start(args, fmt);
1723         tomoyo_write_log2(r, len, fmt, args);
1724         va_end(args);
1725         /* Nothing more to do if granted. */
1726         if (r->granted)
1727                 return 0;
1728         if (r->mode)
1729                 tomoyo_update_stat(r->mode);
1730         switch (r->mode) {
1731         case TOMOYO_CONFIG_ENFORCING:
1732                 error = -EPERM;
1733                 if (atomic_read(&tomoyo_query_observers))
1734                         break;
1735                 goto out;
1736         case TOMOYO_CONFIG_LEARNING:
1737                 error = 0;
1738                 /* Check max_learning_entry parameter. */
1739                 if (tomoyo_domain_quota_is_ok(r))
1740                         break;
1741                 /* fall through */
1742         default:
1743                 return 0;
1744         }
1745         /* Get message. */
1746         va_start(args, fmt);
1747         entry.query = tomoyo_init_log(r, len, fmt, args);
1748         va_end(args);
1749         if (!entry.query)
1750                 goto out;
1751         entry.query_len = strlen(entry.query) + 1;
1752         if (!error) {
1753                 tomoyo_add_entry(r->domain, entry.query);
1754                 goto out;
1755         }
1756         len = tomoyo_round2(entry.query_len);
1757         spin_lock(&tomoyo_query_list_lock);
1758         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
1759             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
1760             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
1761                 quota_exceeded = true;
1762         } else {
1763                 entry.serial = tomoyo_serial++;
1764                 entry.retry = r->retry;
1765                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
1766                 list_add_tail(&entry.list, &tomoyo_query_list);
1767         }
1768         spin_unlock(&tomoyo_query_list_lock);
1769         if (quota_exceeded)
1770                 goto out;
1771         /* Give 10 seconds for supervisor's opinion. */
1772         while (entry.timer < 10) {
1773                 wake_up_all(&tomoyo_query_wait);
1774                 if (wait_event_interruptible_timeout
1775                     (tomoyo_answer_wait, entry.answer ||
1776                      !atomic_read(&tomoyo_query_observers), HZ))
1777                         break;
1778                 else
1779                         entry.timer++;
1780         }
1781         spin_lock(&tomoyo_query_list_lock);
1782         list_del(&entry.list);
1783         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
1784         spin_unlock(&tomoyo_query_list_lock);
1785         switch (entry.answer) {
1786         case 3: /* Asked to retry by administrator. */
1787                 error = TOMOYO_RETRY_REQUEST;
1788                 r->retry++;
1789                 break;
1790         case 1:
1791                 /* Granted by administrator. */
1792                 error = 0;
1793                 break;
1794         default:
1795                 /* Timed out or rejected by administrator. */
1796                 break;
1797         }
1798 out:
1799         kfree(entry.query);
1800         return error;
1801 }
1802
1803 /**
1804  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1805  *
1806  * @file: Pointer to "struct file".
1807  * @wait: Pointer to "poll_table".
1808  *
1809  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1810  *
1811  * Waits for access requests which violated policy in enforcing mode.
1812  */
1813 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1814 {
1815         struct list_head *tmp;
1816         bool found = false;
1817         u8 i;
1818         for (i = 0; i < 2; i++) {
1819                 spin_lock(&tomoyo_query_list_lock);
1820                 list_for_each(tmp, &tomoyo_query_list) {
1821                         struct tomoyo_query *ptr =
1822                                 list_entry(tmp, typeof(*ptr), list);
1823                         if (ptr->answer)
1824                                 continue;
1825                         found = true;
1826                         break;
1827                 }
1828                 spin_unlock(&tomoyo_query_list_lock);
1829                 if (found)
1830                         return POLLIN | POLLRDNORM;
1831                 if (i)
1832                         break;
1833                 poll_wait(file, &tomoyo_query_wait, wait);
1834         }
1835         return 0;
1836 }
1837
1838 /**
1839  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1840  *
1841  * @head: Pointer to "struct tomoyo_io_buffer".
1842  */
1843 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1844 {
1845         struct list_head *tmp;
1846         unsigned int pos = 0;
1847         size_t len = 0;
1848         char *buf;
1849         if (head->r.w_pos)
1850                 return;
1851         if (head->read_buf) {
1852                 kfree(head->read_buf);
1853                 head->read_buf = NULL;
1854         }
1855         spin_lock(&tomoyo_query_list_lock);
1856         list_for_each(tmp, &tomoyo_query_list) {
1857                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1858                 if (ptr->answer)
1859                         continue;
1860                 if (pos++ != head->r.query_index)
1861                         continue;
1862                 len = ptr->query_len;
1863                 break;
1864         }
1865         spin_unlock(&tomoyo_query_list_lock);
1866         if (!len) {
1867                 head->r.query_index = 0;
1868                 return;
1869         }
1870         buf = kzalloc(len + 32, GFP_NOFS);
1871         if (!buf)
1872                 return;
1873         pos = 0;
1874         spin_lock(&tomoyo_query_list_lock);
1875         list_for_each(tmp, &tomoyo_query_list) {
1876                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1877                 if (ptr->answer)
1878                         continue;
1879                 if (pos++ != head->r.query_index)
1880                         continue;
1881                 /*
1882                  * Some query can be skipped because tomoyo_query_list
1883                  * can change, but I don't care.
1884                  */
1885                 if (len == ptr->query_len)
1886                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
1887                                  ptr->retry, ptr->query);
1888                 break;
1889         }
1890         spin_unlock(&tomoyo_query_list_lock);
1891         if (buf[0]) {
1892                 head->read_buf = buf;
1893                 head->r.w[head->r.w_pos++] = buf;
1894                 head->r.query_index++;
1895         } else {
1896                 kfree(buf);
1897         }
1898 }
1899
1900 /**
1901  * tomoyo_write_answer - Write the supervisor's decision.
1902  *
1903  * @head: Pointer to "struct tomoyo_io_buffer".
1904  *
1905  * Returns 0 on success, -EINVAL otherwise.
1906  */
1907 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1908 {
1909         char *data = head->write_buf;
1910         struct list_head *tmp;
1911         unsigned int serial;
1912         unsigned int answer;
1913         spin_lock(&tomoyo_query_list_lock);
1914         list_for_each(tmp, &tomoyo_query_list) {
1915                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1916                 ptr->timer = 0;
1917         }
1918         spin_unlock(&tomoyo_query_list_lock);
1919         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1920                 return -EINVAL;
1921         spin_lock(&tomoyo_query_list_lock);
1922         list_for_each(tmp, &tomoyo_query_list) {
1923                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1924                 if (ptr->serial != serial)
1925                         continue;
1926                 if (!ptr->answer)
1927                         ptr->answer = answer;
1928                 break;
1929         }
1930         spin_unlock(&tomoyo_query_list_lock);
1931         return 0;
1932 }
1933
1934 /**
1935  * tomoyo_read_version: Get version.
1936  *
1937  * @head: Pointer to "struct tomoyo_io_buffer".
1938  *
1939  * Returns version information.
1940  */
1941 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1942 {
1943         if (!head->r.eof) {
1944                 tomoyo_io_printf(head, "2.4.0");
1945                 head->r.eof = true;
1946         }
1947 }
1948
1949 /**
1950  * tomoyo_read_self_domain - Get the current process's domainname.
1951  *
1952  * @head: Pointer to "struct tomoyo_io_buffer".
1953  *
1954  * Returns the current process's domainname.
1955  */
1956 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1957 {
1958         if (!head->r.eof) {
1959                 /*
1960                  * tomoyo_domain()->domainname != NULL
1961                  * because every process belongs to a domain and
1962                  * the domain's name cannot be NULL.
1963                  */
1964                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1965                 head->r.eof = true;
1966         }
1967 }
1968
1969 /* String table for /sys/kernel/security/tomoyo/stat interface. */
1970 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
1971         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
1972         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
1973         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
1974         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
1975 };
1976
1977 /* String table for /sys/kernel/security/tomoyo/stat interface. */
1978 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
1979         [TOMOYO_MEMORY_POLICY] = "policy:",
1980         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
1981         [TOMOYO_MEMORY_QUERY]  = "query message:",
1982 };
1983
1984 /* Timestamp counter for last updated. */
1985 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
1986 /* Counter for number of updates. */
1987 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
1988
1989 /**
1990  * tomoyo_update_stat - Update statistic counters.
1991  *
1992  * @index: Index for policy type.
1993  *
1994  * Returns nothing.
1995  */
1996 void tomoyo_update_stat(const u8 index)
1997 {
1998         struct timeval tv;
1999         do_gettimeofday(&tv);
2000         /*
2001          * I don't use atomic operations because race condition is not fatal.
2002          */
2003         tomoyo_stat_updated[index]++;
2004         tomoyo_stat_modified[index] = tv.tv_sec;
2005 }
2006
2007 /**
2008  * tomoyo_read_stat - Read statistic data.
2009  *
2010  * @head: Pointer to "struct tomoyo_io_buffer".
2011  *
2012  * Returns nothing.
2013  */
2014 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2015 {
2016         u8 i;
2017         unsigned int total = 0;
2018         if (head->r.eof)
2019                 return;
2020         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2021                 tomoyo_io_printf(head, "Policy %-30s %10u",
2022                                  tomoyo_policy_headers[i],
2023                                  tomoyo_stat_updated[i]);
2024                 if (tomoyo_stat_modified[i]) {
2025                         struct tomoyo_time stamp;
2026                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2027                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2028                                          "%02u:%02u:%02u)",
2029                                          stamp.year, stamp.month, stamp.day,
2030                                          stamp.hour, stamp.min, stamp.sec);
2031                 }
2032                 tomoyo_set_lf(head);
2033         }
2034         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2035                 unsigned int used = tomoyo_memory_used[i];
2036                 total += used;
2037                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2038                                  tomoyo_memory_headers[i], used);
2039                 used = tomoyo_memory_quota[i];
2040                 if (used)
2041                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2042                 tomoyo_set_lf(head);
2043         }
2044         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2045                          total);
2046         head->r.eof = true;
2047 }
2048
2049 /**
2050  * tomoyo_write_stat - Set memory quota.
2051  *
2052  * @head: Pointer to "struct tomoyo_io_buffer".
2053  *
2054  * Returns 0.
2055  */
2056 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2057 {
2058         char *data = head->write_buf;
2059         u8 i;
2060         if (tomoyo_str_starts(&data, "Memory used by "))
2061                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2062                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2063                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2064         return 0;
2065 }
2066
2067 /**
2068  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2069  *
2070  * @type: Type of interface.
2071  * @file: Pointer to "struct file".
2072  *
2073  * Returns 0 on success, negative value otherwise.
2074  */
2075 int tomoyo_open_control(const u8 type, struct file *file)
2076 {
2077         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2078
2079         if (!head)
2080                 return -ENOMEM;
2081         mutex_init(&head->io_sem);
2082         head->type = type;
2083         switch (type) {
2084         case TOMOYO_DOMAINPOLICY:
2085                 /* /sys/kernel/security/tomoyo/domain_policy */
2086                 head->write = tomoyo_write_domain;
2087                 head->read = tomoyo_read_domain;
2088                 break;
2089         case TOMOYO_EXCEPTIONPOLICY:
2090                 /* /sys/kernel/security/tomoyo/exception_policy */
2091                 head->write = tomoyo_write_exception;
2092                 head->read = tomoyo_read_exception;
2093                 break;
2094         case TOMOYO_AUDIT:
2095                 /* /sys/kernel/security/tomoyo/audit */
2096                 head->poll = tomoyo_poll_log;
2097                 head->read = tomoyo_read_log;
2098                 break;
2099         case TOMOYO_SELFDOMAIN:
2100                 /* /sys/kernel/security/tomoyo/self_domain */
2101                 head->read = tomoyo_read_self_domain;
2102                 break;
2103         case TOMOYO_PROCESS_STATUS:
2104                 /* /sys/kernel/security/tomoyo/.process_status */
2105                 head->write = tomoyo_write_pid;
2106                 head->read = tomoyo_read_pid;
2107                 break;
2108         case TOMOYO_VERSION:
2109                 /* /sys/kernel/security/tomoyo/version */
2110                 head->read = tomoyo_read_version;
2111                 head->readbuf_size = 128;
2112                 break;
2113         case TOMOYO_STAT:
2114                 /* /sys/kernel/security/tomoyo/stat */
2115                 head->write = tomoyo_write_stat;
2116                 head->read = tomoyo_read_stat;
2117                 head->readbuf_size = 1024;
2118                 break;
2119         case TOMOYO_PROFILE:
2120                 /* /sys/kernel/security/tomoyo/profile */
2121                 head->write = tomoyo_write_profile;
2122                 head->read = tomoyo_read_profile;
2123                 break;
2124         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2125                 head->poll = tomoyo_poll_query;
2126                 head->write = tomoyo_write_answer;
2127                 head->read = tomoyo_read_query;
2128                 break;
2129         case TOMOYO_MANAGER:
2130                 /* /sys/kernel/security/tomoyo/manager */
2131                 head->write = tomoyo_write_manager;
2132                 head->read = tomoyo_read_manager;
2133                 break;
2134         }
2135         if (!(file->f_mode & FMODE_READ)) {
2136                 /*
2137                  * No need to allocate read_buf since it is not opened
2138                  * for reading.
2139                  */
2140                 head->read = NULL;
2141                 head->poll = NULL;
2142         } else if (!head->poll) {
2143                 /* Don't allocate read_buf for poll() access. */
2144                 if (!head->readbuf_size)
2145                         head->readbuf_size = 4096 * 2;
2146                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2147                 if (!head->read_buf) {
2148                         kfree(head);
2149                         return -ENOMEM;
2150                 }
2151         }
2152         if (!(file->f_mode & FMODE_WRITE)) {
2153                 /*
2154                  * No need to allocate write_buf since it is not opened
2155                  * for writing.
2156                  */
2157                 head->write = NULL;
2158         } else if (head->write) {
2159                 head->writebuf_size = 4096 * 2;
2160                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2161                 if (!head->write_buf) {
2162                         kfree(head->read_buf);
2163                         kfree(head);
2164                         return -ENOMEM;
2165                 }
2166         }
2167         /*
2168          * If the file is /sys/kernel/security/tomoyo/query , increment the
2169          * observer counter.
2170          * The obserber counter is used by tomoyo_supervisor() to see if
2171          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2172          */
2173         if (type == TOMOYO_QUERY)
2174                 atomic_inc(&tomoyo_query_observers);
2175         file->private_data = head;
2176         tomoyo_notify_gc(head, true);
2177         return 0;
2178 }
2179
2180 /**
2181  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2182  *
2183  * @file: Pointer to "struct file".
2184  * @wait: Pointer to "poll_table".
2185  *
2186  * Waits for read readiness.
2187  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2188  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2189  */
2190 int tomoyo_poll_control(struct file *file, poll_table *wait)
2191 {
2192         struct tomoyo_io_buffer *head = file->private_data;
2193         if (!head->poll)
2194                 return -ENOSYS;
2195         return head->poll(file, wait);
2196 }
2197
2198 /**
2199  * tomoyo_set_namespace_cursor - Set namespace to read.
2200  *
2201  * @head: Pointer to "struct tomoyo_io_buffer".
2202  *
2203  * Returns nothing.
2204  */
2205 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2206 {
2207         struct list_head *ns;
2208         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2209             head->type != TOMOYO_PROFILE)
2210                 return;
2211         /*
2212          * If this is the first read, or reading previous namespace finished
2213          * and has more namespaces to read, update the namespace cursor.
2214          */
2215         ns = head->r.ns;
2216         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2217                 /* Clearing is OK because tomoyo_flush() returned true. */
2218                 memset(&head->r, 0, sizeof(head->r));
2219                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2220         }
2221 }
2222
2223 /**
2224  * tomoyo_has_more_namespace - Check for unread namespaces.
2225  *
2226  * @head: Pointer to "struct tomoyo_io_buffer".
2227  *
2228  * Returns true if we have more entries to print, false otherwise.
2229  */
2230 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2231 {
2232         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2233                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2234                 head->r.ns->next != &tomoyo_namespace_list;
2235 }
2236
2237 /**
2238  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2239  *
2240  * @head:       Pointer to "struct tomoyo_io_buffer".
2241  * @buffer:     Poiner to buffer to write to.
2242  * @buffer_len: Size of @buffer.
2243  *
2244  * Returns bytes read on success, negative value otherwise.
2245  */
2246 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2247                             const int buffer_len)
2248 {
2249         int len;
2250         int idx;
2251
2252         if (!head->read)
2253                 return -ENOSYS;
2254         if (mutex_lock_interruptible(&head->io_sem))
2255                 return -EINTR;
2256         head->read_user_buf = buffer;
2257         head->read_user_buf_avail = buffer_len;
2258         idx = tomoyo_read_lock();
2259         if (tomoyo_flush(head))
2260                 /* Call the policy handler. */
2261                 do {
2262                         tomoyo_set_namespace_cursor(head);
2263                         head->read(head);
2264                 } while (tomoyo_flush(head) &&
2265                          tomoyo_has_more_namespace(head));
2266         tomoyo_read_unlock(idx);
2267         len = head->read_user_buf - buffer;
2268         mutex_unlock(&head->io_sem);
2269         return len;
2270 }
2271
2272 /**
2273  * tomoyo_parse_policy - Parse a policy line.
2274  *
2275  * @head: Poiter to "struct tomoyo_io_buffer".
2276  * @line: Line to parse.
2277  *
2278  * Returns 0 on success, negative value otherwise.
2279  *
2280  * Caller holds tomoyo_read_lock().
2281  */
2282 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2283 {
2284         /* Delete request? */
2285         head->w.is_delete = !strncmp(line, "delete ", 7);
2286         if (head->w.is_delete)
2287                 memmove(line, line + 7, strlen(line + 7) + 1);
2288         /* Selecting namespace to update. */
2289         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2290             head->type == TOMOYO_PROFILE) {
2291                 if (*line == '<') {
2292                         char *cp = strchr(line, ' ');
2293                         if (cp) {
2294                                 *cp++ = '\0';
2295                                 head->w.ns = tomoyo_assign_namespace(line);
2296                                 memmove(line, cp, strlen(cp) + 1);
2297                         } else
2298                                 head->w.ns = NULL;
2299                 } else
2300                         head->w.ns = &tomoyo_kernel_namespace;
2301                 /* Don't allow updating if namespace is invalid. */
2302                 if (!head->w.ns)
2303                         return -ENOENT;
2304         }
2305         /* Do the update. */
2306         return head->write(head);
2307 }
2308
2309 /**
2310  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2311  *
2312  * @head:       Pointer to "struct tomoyo_io_buffer".
2313  * @buffer:     Pointer to buffer to read from.
2314  * @buffer_len: Size of @buffer.
2315  *
2316  * Returns @buffer_len on success, negative value otherwise.
2317  */
2318 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2319                              const char __user *buffer, const int buffer_len)
2320 {
2321         int error = buffer_len;
2322         size_t avail_len = buffer_len;
2323         char *cp0 = head->write_buf;
2324         int idx;
2325         if (!head->write)
2326                 return -ENOSYS;
2327         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2328                 return -EFAULT;
2329         if (mutex_lock_interruptible(&head->io_sem))
2330                 return -EINTR;
2331         idx = tomoyo_read_lock();
2332         /* Read a line and dispatch it to the policy handler. */
2333         while (avail_len > 0) {
2334                 char c;
2335                 if (head->w.avail >= head->writebuf_size - 1) {
2336                         const int len = head->writebuf_size * 2;
2337                         char *cp = kzalloc(len, GFP_NOFS);
2338                         if (!cp) {
2339                                 error = -ENOMEM;
2340                                 break;
2341                         }
2342                         memmove(cp, cp0, head->w.avail);
2343                         kfree(cp0);
2344                         head->write_buf = cp;
2345                         cp0 = cp;
2346                         head->writebuf_size = len;
2347                 }
2348                 if (get_user(c, buffer)) {
2349                         error = -EFAULT;
2350                         break;
2351                 }
2352                 buffer++;
2353                 avail_len--;
2354                 cp0[head->w.avail++] = c;
2355                 if (c != '\n')
2356                         continue;
2357                 cp0[head->w.avail - 1] = '\0';
2358                 head->w.avail = 0;
2359                 tomoyo_normalize_line(cp0);
2360                 if (!strcmp(cp0, "reset")) {
2361                         head->w.ns = &tomoyo_kernel_namespace;
2362                         head->w.domain = NULL;
2363                         memset(&head->r, 0, sizeof(head->r));
2364                         continue;
2365                 }
2366                 /* Don't allow updating policies by non manager programs. */
2367                 switch (head->type) {
2368                 case TOMOYO_PROCESS_STATUS:
2369                         /* This does not write anything. */
2370                         break;
2371                 case TOMOYO_DOMAINPOLICY:
2372                         if (tomoyo_select_domain(head, cp0))
2373                                 continue;
2374                         /* fall through */
2375                 case TOMOYO_EXCEPTIONPOLICY:
2376                         if (!strcmp(cp0, "select transition_only")) {
2377                                 head->r.print_transition_related_only = true;
2378                                 continue;
2379                         }
2380                         /* fall through */
2381                 default:
2382                         if (!tomoyo_manager()) {
2383                                 error = -EPERM;
2384                                 goto out;
2385                         }
2386                 }
2387                 switch (tomoyo_parse_policy(head, cp0)) {
2388                 case -EPERM:
2389                         error = -EPERM;
2390                         goto out;
2391                 case 0:
2392                         switch (head->type) {
2393                         case TOMOYO_DOMAINPOLICY:
2394                         case TOMOYO_EXCEPTIONPOLICY:
2395                         case TOMOYO_STAT:
2396                         case TOMOYO_PROFILE:
2397                         case TOMOYO_MANAGER:
2398                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2399                                 break;
2400                         default:
2401                                 break;
2402                         }
2403                         break;
2404                 }
2405         }
2406 out:
2407         tomoyo_read_unlock(idx);
2408         mutex_unlock(&head->io_sem);
2409         return error;
2410 }
2411
2412 /**
2413  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2414  *
2415  * @head: Pointer to "struct tomoyo_io_buffer".
2416  *
2417  * Returns 0.
2418  */
2419 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2420 {
2421         /*
2422          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2423          * observer counter.
2424          */
2425         if (head->type == TOMOYO_QUERY &&
2426             atomic_dec_and_test(&tomoyo_query_observers))
2427                 wake_up_all(&tomoyo_answer_wait);
2428         tomoyo_notify_gc(head, false);
2429         return 0;
2430 }
2431
2432 /**
2433  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2434  */
2435 void tomoyo_check_profile(void)
2436 {
2437         struct tomoyo_domain_info *domain;
2438         const int idx = tomoyo_read_lock();
2439         tomoyo_policy_loaded = true;
2440         printk(KERN_INFO "TOMOYO: 2.4.0\n");
2441         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2442                 const u8 profile = domain->profile;
2443                 const struct tomoyo_policy_namespace *ns = domain->ns;
2444                 if (ns->profile_version != 20100903)
2445                         printk(KERN_ERR
2446                                "Profile version %u is not supported.\n",
2447                                ns->profile_version);
2448                 else if (!ns->profile_ptr[profile])
2449                         printk(KERN_ERR
2450                                "Profile %u (used by '%s') is not defined.\n",
2451                                profile, domain->domainname->name);
2452                 else
2453                         continue;
2454                 printk(KERN_ERR
2455                        "Userland tools for TOMOYO 2.4 must be installed and "
2456                        "policy must be initialized.\n");
2457                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.4/ "
2458                        "for more information.\n");
2459                 panic("STOP!");
2460         }
2461         tomoyo_read_unlock(idx);
2462         printk(KERN_INFO "Mandatory Access Control activated.\n");
2463 }
2464
2465 /**
2466  * tomoyo_load_builtin_policy - Load built-in policy.
2467  *
2468  * Returns nothing.
2469  */
2470 void __init tomoyo_load_builtin_policy(void)
2471 {
2472         /*
2473          * This include file is manually created and contains built-in policy
2474          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2475          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2476          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2477          */
2478 #include "builtin-policy.h"
2479         u8 i;
2480         const int idx = tomoyo_read_lock();
2481         for (i = 0; i < 5; i++) {
2482                 struct tomoyo_io_buffer head = { };
2483                 char *start = "";
2484                 switch (i) {
2485                 case 0:
2486                         start = tomoyo_builtin_profile;
2487                         head.type = TOMOYO_PROFILE;
2488                         head.write = tomoyo_write_profile;
2489                         break;
2490                 case 1:
2491                         start = tomoyo_builtin_exception_policy;
2492                         head.type = TOMOYO_EXCEPTIONPOLICY;
2493                         head.write = tomoyo_write_exception;
2494                         break;
2495                 case 2:
2496                         start = tomoyo_builtin_domain_policy;
2497                         head.type = TOMOYO_DOMAINPOLICY;
2498                         head.write = tomoyo_write_domain;
2499                         break;
2500                 case 3:
2501                         start = tomoyo_builtin_manager;
2502                         head.type = TOMOYO_MANAGER;
2503                         head.write = tomoyo_write_manager;
2504                         break;
2505                 case 4:
2506                         start = tomoyo_builtin_stat;
2507                         head.type = TOMOYO_STAT;
2508                         head.write = tomoyo_write_stat;
2509                         break;
2510                 }
2511                 while (1) {
2512                         char *end = strchr(start, '\n');
2513                         if (!end)
2514                                 break;
2515                         *end = '\0';
2516                         tomoyo_normalize_line(start);
2517                         head.write_buf = start;
2518                         tomoyo_parse_policy(&head, start);
2519                         start = end + 1;
2520                 }
2521         }
2522         tomoyo_read_unlock(idx);
2523 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2524         tomoyo_check_profile();
2525 #endif
2526 }