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_EXEC_REALPATH]        = "exec.realpath",
  83         [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
  84         [TOMOYO_PATH1_UID]            = "path1.uid",
  85         [TOMOYO_PATH1_GID]            = "path1.gid",
  86         [TOMOYO_PATH1_INO]            = "path1.ino",
  87         [TOMOYO_PATH1_MAJOR]          = "path1.major",
  88         [TOMOYO_PATH1_MINOR]          = "path1.minor",
  89         [TOMOYO_PATH1_PERM]           = "path1.perm",
  90         [TOMOYO_PATH1_TYPE]           = "path1.type",
  91         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
  92         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
  93         [TOMOYO_PATH2_UID]            = "path2.uid",
  94         [TOMOYO_PATH2_GID]            = "path2.gid",
  95         [TOMOYO_PATH2_INO]            = "path2.ino",
  96         [TOMOYO_PATH2_MAJOR]          = "path2.major",
  97         [TOMOYO_PATH2_MINOR]          = "path2.minor",
  98         [TOMOYO_PATH2_PERM]           = "path2.perm",
  99         [TOMOYO_PATH2_TYPE]           = "path2.type",
 100         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
 101         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
 102         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
 103         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
 104         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
 105         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
 106         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
 107         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
 108         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
 109         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
 110 };
 111
 112 /* String table for PREFERENCE keyword. */
 113 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
 114         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
 115         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
 116 };
 117
 118 /* String table for path operation. */
 119 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
 120         [TOMOYO_TYPE_EXECUTE]    = "execute",
 121         [TOMOYO_TYPE_READ]       = "read",
 122         [TOMOYO_TYPE_WRITE]      = "write",
 123         [TOMOYO_TYPE_APPEND]     = "append",
 124         [TOMOYO_TYPE_UNLINK]     = "unlink",
 125         [TOMOYO_TYPE_GETATTR]    = "getattr",
 126         [TOMOYO_TYPE_RMDIR]      = "rmdir",
 127         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
 128         [TOMOYO_TYPE_SYMLINK]    = "symlink",
 129         [TOMOYO_TYPE_CHROOT]     = "chroot",
 130         [TOMOYO_TYPE_UMOUNT]     = "unmount",
 131 };
 132
 133 /* String table for categories. */
 134 static const char * const tomoyo_category_keywords
 135 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
 136         [TOMOYO_MAC_CATEGORY_FILE]       = "file",
 137 };
 138
 139 /* Permit policy management by non-root user? */
 140 static bool tomoyo_manage_by_non_root;
 141
 142 /* Utility functions. */
 143
 144 /**
 145  * tomoyo_yesno - Return "yes" or "no".
 146  *
 147  * @value: Bool value.
 148  */
 149 const char *tomoyo_yesno(const unsigned int value)
 150 {
 151         return value ? "yes" : "no";
 152 }
 153
 154 /**
 155  * tomoyo_addprintf - strncat()-like-snprintf().
 156  *
 157  * @buffer: Buffer to write to. Must be '\0'-terminated.
 158  * @len:    Size of @buffer.
 159  * @fmt:    The printf()'s format string, followed by parameters.
 160  *
 161  * Returns nothing.
 162  */
 163 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
 164 {
 165         va_list args;
 166         const int pos = strlen(buffer);
 167         va_start(args, fmt);
 168         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
 169         va_end(args);
 170 }
 171
 172 /**
 173  * tomoyo_flush - Flush queued string to userspace's buffer.
 174  *
 175  * @head:   Pointer to "struct tomoyo_io_buffer".
 176  *
 177  * Returns true if all data was flushed, false otherwise.
 178  */
 179 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 180 {
 181         while (head->r.w_pos) {
 182                 const char *w = head->r.w[0];
 183                 size_t len = strlen(w);
 184                 if (len) {
 185                         if (len > head->read_user_buf_avail)
 186                                 len = head->read_user_buf_avail;
 187                         if (!len)
 188                                 return false;
 189                         if (copy_to_user(head->read_user_buf, w, len))
 190                                 return false;
 191                         head->read_user_buf_avail -= len;
 192                         head->read_user_buf += len;
 193                         w += len;
 194                 }
 195                 head->r.w[0] = w;
 196                 if (*w)
 197                         return false;
 198                 /* Add '\0' for audit logs and query. */
 199                 if (head->poll) {
 200                         if (!head->read_user_buf_avail ||
 201                             copy_to_user(head->read_user_buf, "", 1))
 202                                 return false;
 203                         head->read_user_buf_avail--;
 204                         head->read_user_buf++;
 205                 }
 206                 head->r.w_pos--;
 207                 for (len = 0; len < head->r.w_pos; len++)
 208                         head->r.w[len] = head->r.w[len + 1];
 209         }
 210         head->r.avail = 0;
 211         return true;
 212 }
 213
 214 /**
 215  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 216  *
 217  * @head:   Pointer to "struct tomoyo_io_buffer".
 218  * @string: String to print.
 219  *
 220  * Note that @string has to be kept valid until @head is kfree()d.
 221  * This means that char[] allocated on stack memory cannot be passed to
 222  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 223  */
 224 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 225 {
 226         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 227                 head->r.w[head->r.w_pos++] = string;
 228                 tomoyo_flush(head);
 229         } else
 230                 WARN_ON(1);
 231 }
 232
 233 /**
 234  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 235  *
 236  * @head: Pointer to "struct tomoyo_io_buffer".
 237  * @fmt:  The printf()'s format string, followed by parameters.
 238  */
 239 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 240 {
 241         va_list args;
 242         size_t len;
 243         size_t pos = head->r.avail;
 244         int size = head->readbuf_size - pos;
 245         if (size <= 0)
 246                 return;
 247         va_start(args, fmt);
 248         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 249         va_end(args);
 250         if (pos + len >= head->readbuf_size) {
 251                 WARN_ON(1);
 252                 return;
 253         }
 254         head->r.avail += len;
 255         tomoyo_set_string(head, head->read_buf + pos);
 256 }
 257
 258 /**
 259  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 260  *
 261  * @head: Pointer to "struct tomoyo_io_buffer".
 262  *
 263  * Returns nothing.
 264  */
 265 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 266 {
 267         tomoyo_set_string(head, " ");
 268 }
 269
 270 /**
 271  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 272  *
 273  * @head: Pointer to "struct tomoyo_io_buffer".
 274  *
 275  * Returns nothing.
 276  */
 277 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 278 {
 279         tomoyo_set_string(head, "\n");
 280         return !head->r.w_pos;
 281 }
 282
 283 /**
 284  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 285  *
 286  * @head: Pointer to "struct tomoyo_io_buffer".
 287  *
 288  * Returns nothing.
 289  */
 290 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 291 {
 292         tomoyo_set_string(head, "/");
 293 }
 294
 295 /* List of namespaces. */
 296 LIST_HEAD(tomoyo_namespace_list);
 297 /* True if namespace other than tomoyo_kernel_namespace is defined. */
 298 static bool tomoyo_namespace_enabled;
 299
 300 /**
 301  * tomoyo_init_policy_namespace - Initialize namespace.
 302  *
 303  * @ns: Pointer to "struct tomoyo_policy_namespace".
 304  *
 305  * Returns nothing.
 306  */
 307 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 308 {
 309         unsigned int idx;
 310         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 311                 INIT_LIST_HEAD(&ns->acl_group[idx]);
 312         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 313                 INIT_LIST_HEAD(&ns->group_list[idx]);
 314         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 315                 INIT_LIST_HEAD(&ns->policy_list[idx]);
 316         ns->profile_version = 20100903;
 317         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 318         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 319 }
 320
 321 /**
 322  * tomoyo_print_namespace - Print namespace header.
 323  *
 324  * @head: Pointer to "struct tomoyo_io_buffer".
 325  *
 326  * Returns nothing.
 327  */
 328 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 329 {
 330         if (!tomoyo_namespace_enabled)
 331                 return;
 332         tomoyo_set_string(head,
 333                           container_of(head->r.ns,
 334                                        struct tomoyo_policy_namespace,
 335                                        namespace_list)->name);
 336         tomoyo_set_space(head);
 337 }
 338
 339 /**
 340  * tomoyo_print_name_union - Print a tomoyo_name_union.
 341  *
 342  * @head: Pointer to "struct tomoyo_io_buffer".
 343  * @ptr:  Pointer to "struct tomoyo_name_union".
 344  */
 345 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 346                                     const struct tomoyo_name_union *ptr)
 347 {
 348         tomoyo_set_space(head);
 349         if (ptr->group) {
 350                 tomoyo_set_string(head, "@");
 351                 tomoyo_set_string(head, ptr->group->group_name->name);
 352         } else {
 353                 tomoyo_set_string(head, ptr->filename->name);
 354         }
 355 }
 356
 357 /**
 358  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
 359  *
 360  * @head: Pointer to "struct tomoyo_io_buffer".
 361  * @ptr:  Pointer to "struct tomoyo_name_union".
 362  *
 363  * Returns nothing.
 364  */
 365 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
 366                                            const struct tomoyo_name_union *ptr)
 367 {
 368         if (ptr->group) {
 369                 tomoyo_set_string(head, "@");
 370                 tomoyo_set_string(head, ptr->group->group_name->name);
 371         } else {
 372                 tomoyo_set_string(head, "\"");
 373                 tomoyo_set_string(head, ptr->filename->name);
 374                 tomoyo_set_string(head, "\"");
 375         }
 376 }
 377
 378 /**
 379  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 380  *
 381  * @head: Pointer to "struct tomoyo_io_buffer".
 382  * @ptr:  Pointer to "struct tomoyo_number_union".
 383  *
 384  * Returns nothing.
 385  */
 386 static void tomoyo_print_number_union_nospace
 387 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 388 {
 389         if (ptr->group) {
 390                 tomoyo_set_string(head, "@");
 391                 tomoyo_set_string(head, ptr->group->group_name->name);
 392         } else {
 393                 int i;
 394                 unsigned long min = ptr->values[0];
 395                 const unsigned long max = ptr->values[1];
 396                 u8 min_type = ptr->value_type[0];
 397                 const u8 max_type = ptr->value_type[1];
 398                 char buffer[128];
 399                 buffer[0] = '\0';
 400                 for (i = 0; i < 2; i++) {
 401                         switch (min_type) {
 402                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 403                                 tomoyo_addprintf(buffer, sizeof(buffer),
 404                                                  "0x%lX", min);
 405                                 break;
 406                         case TOMOYO_VALUE_TYPE_OCTAL:
 407                                 tomoyo_addprintf(buffer, sizeof(buffer),
 408                                                  "0%lo", min);
 409                                 break;
 410                         default:
 411                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 412                                                  min);
 413                                 break;
 414                         }
 415                         if (min == max && min_type == max_type)
 416                                 break;
 417                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 418                         min_type = max_type;
 419                         min = max;
 420                 }
 421                 tomoyo_io_printf(head, "%s", buffer);
 422         }
 423 }
 424
 425 /**
 426  * tomoyo_print_number_union - Print a tomoyo_number_union.
 427  *
 428  * @head: Pointer to "struct tomoyo_io_buffer".
 429  * @ptr:  Pointer to "struct tomoyo_number_union".
 430  *
 431  * Returns nothing.
 432  */
 433 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 434                                       const struct tomoyo_number_union *ptr)
 435 {
 436         tomoyo_set_space(head);
 437         tomoyo_print_number_union_nospace(head, ptr);
 438 }
 439
 440 /**
 441  * tomoyo_assign_profile - Create a new profile.
 442  *
 443  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 444  * @profile: Profile number to create.
 445  *
 446  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 447  */
 448 static struct tomoyo_profile *tomoyo_assign_profile
 449 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
 450 {
 451         struct tomoyo_profile *ptr;
 452         struct tomoyo_profile *entry;
 453         if (profile >= TOMOYO_MAX_PROFILES)
 454                 return NULL;
 455         ptr = ns->profile_ptr[profile];
 456         if (ptr)
 457                 return ptr;
 458         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 459         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 460                 goto out;
 461         ptr = ns->profile_ptr[profile];
 462         if (!ptr && tomoyo_memory_ok(entry)) {
 463                 ptr = entry;
 464                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 465                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 466                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 467                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 468                        sizeof(ptr->config));
 469                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
 470                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
 471                 mb(); /* Avoid out-of-order execution. */
 472                 ns->profile_ptr[profile] = ptr;
 473                 entry = NULL;
 474         }
 475         mutex_unlock(&tomoyo_policy_lock);
 476  out:
 477         kfree(entry);
 478         return ptr;
 479 }
 480
 481 /**
 482  * tomoyo_profile - Find a profile.
 483  *
 484  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 485  * @profile: Profile number to find.
 486  *
 487  * Returns pointer to "struct tomoyo_profile".
 488  */
 489 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 490                                       const u8 profile)
 491 {
 492         static struct tomoyo_profile tomoyo_null_profile;
 493         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 494         if (!ptr)
 495                 ptr = &tomoyo_null_profile;
 496         return ptr;
 497 }
 498
 499 /**
 500  * tomoyo_find_yesno - Find values for specified keyword.
 501  *
 502  * @string: String to check.
 503  * @find:   Name of keyword.
 504  *
 505  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 506  */
 507 static s8 tomoyo_find_yesno(const char *string, const char *find)
 508 {
 509         const char *cp = strstr(string, find);
 510         if (cp) {
 511                 cp += strlen(find);
 512                 if (!strncmp(cp, "=yes", 4))
 513                         return 1;
 514                 else if (!strncmp(cp, "=no", 3))
 515                         return 0;
 516         }
 517         return -1;
 518 }
 519
 520 /**
 521  * tomoyo_set_uint - Set value for specified preference.
 522  *
 523  * @i:      Pointer to "unsigned int".
 524  * @string: String to check.
 525  * @find:   Name of keyword.
 526  *
 527  * Returns nothing.
 528  */
 529 static void tomoyo_set_uint(unsigned int *i, const char *string,
 530                             const char *find)
 531 {
 532         const char *cp = strstr(string, find);
 533         if (cp)
 534                 sscanf(cp + strlen(find), "=%u", i);
 535 }
 536
 537 /**
 538  * tomoyo_set_mode - Set mode for specified profile.
 539  *
 540  * @name:    Name of functionality.
 541  * @value:   Mode for @name.
 542  * @profile: Pointer to "struct tomoyo_profile".
 543  *
 544  * Returns 0 on success, negative value otherwise.
 545  */
 546 static int tomoyo_set_mode(char *name, const char *value,
 547                            struct tomoyo_profile *profile)
 548 {
 549         u8 i;
 550         u8 config;
 551         if (!strcmp(name, "CONFIG")) {
 552                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 553                 config = profile->default_config;
 554         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 555                 config = 0;
 556                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 557                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 558                         int len = 0;
 559                         if (i < TOMOYO_MAX_MAC_INDEX) {
 560                                 const u8 c = tomoyo_index2category[i];
 561                                 const char *category =
 562                                         tomoyo_category_keywords[c];
 563                                 len = strlen(category);
 564                                 if (strncmp(name, category, len) ||
 565                                     name[len++] != ':' || name[len++] != ':')
 566                                         continue;
 567                         }
 568                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
 569                                 continue;
 570                         config = profile->config[i];
 571                         break;
 572                 }
 573                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 574                         return -EINVAL;
 575         } else {
 576                 return -EINVAL;
 577         }
 578         if (strstr(value, "use_default")) {
 579                 config = TOMOYO_CONFIG_USE_DEFAULT;
 580         } else {
 581                 u8 mode;
 582                 for (mode = 0; mode < 4; mode++)
 583                         if (strstr(value, tomoyo_mode[mode]))
 584                                 /*
 585                                  * Update lower 3 bits in order to distinguish
 586                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 587                                  */
 588                                 config = (config & ~7) | mode;
 589                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 590                         switch (tomoyo_find_yesno(value, "grant_log")) {
 591                         case 1:
 592                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 593                                 break;
 594                         case 0:
 595                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 596                                 break;
 597                         }
 598                         switch (tomoyo_find_yesno(value, "reject_log")) {
 599                         case 1:
 600                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 601                                 break;
 602                         case 0:
 603                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 604                                 break;
 605                         }
 606                 }
 607         }
 608         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 609                 profile->config[i] = config;
 610         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 611                 profile->default_config = config;
 612         return 0;
 613 }
 614
 615 /**
 616  * tomoyo_write_profile - Write profile table.
 617  *
 618  * @head: Pointer to "struct tomoyo_io_buffer".
 619  *
 620  * Returns 0 on success, negative value otherwise.
 621  */
 622 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 623 {
 624         char *data = head->write_buf;
 625         unsigned int i;
 626         char *cp;
 627         struct tomoyo_profile *profile;
 628         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 629             == 1)
 630                 return 0;
 631         i = simple_strtoul(data, &cp, 10);
 632         if (*cp != '-')
 633                 return -EINVAL;
 634         data = cp + 1;
 635         profile = tomoyo_assign_profile(head->w.ns, i);
 636         if (!profile)
 637                 return -EINVAL;
 638         cp = strchr(data, '=');
 639         if (!cp)
 640                 return -EINVAL;
 641         *cp++ = '\0';
 642         if (!strcmp(data, "COMMENT")) {
 643                 static DEFINE_SPINLOCK(lock);
 644                 const struct tomoyo_path_info *new_comment
 645                         = tomoyo_get_name(cp);
 646                 const struct tomoyo_path_info *old_comment;
 647                 if (!new_comment)
 648                         return -ENOMEM;
 649                 spin_lock(&lock);
 650                 old_comment = profile->comment;
 651                 profile->comment = new_comment;
 652                 spin_unlock(&lock);
 653                 tomoyo_put_name(old_comment);
 654                 return 0;
 655         }
 656         if (!strcmp(data, "PREFERENCE")) {
 657                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 658                         tomoyo_set_uint(&profile->pref[i], cp,
 659                                         tomoyo_pref_keywords[i]);
 660                 return 0;
 661         }
 662         return tomoyo_set_mode(data, cp, profile);
 663 }
 664
 665 /**
 666  * tomoyo_print_config - Print mode for specified functionality.
 667  *
 668  * @head:   Pointer to "struct tomoyo_io_buffer".
 669  * @config: Mode for that functionality.
 670  *
 671  * Returns nothing.
 672  *
 673  * Caller prints functionality's name.
 674  */
 675 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 676 {
 677         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 678                          tomoyo_mode[config & 3],
 679                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 680                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 681 }
 682
 683 /**
 684  * tomoyo_read_profile - Read profile table.
 685  *
 686  * @head: Pointer to "struct tomoyo_io_buffer".
 687  *
 688  * Returns nothing.
 689  */
 690 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 691 {
 692         u8 index;
 693         struct tomoyo_policy_namespace *ns =
 694                 container_of(head->r.ns, typeof(*ns), namespace_list);
 695         const struct tomoyo_profile *profile;
 696         if (head->r.eof)
 697                 return;
 698  next:
 699         index = head->r.index;
 700         profile = ns->profile_ptr[index];
 701         switch (head->r.step) {
 702         case 0:
 703                 tomoyo_print_namespace(head);
 704                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 705                                  ns->profile_version);
 706                 head->r.step++;
 707                 break;
 708         case 1:
 709                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 710                       head->r.index++)
 711                         if (ns->profile_ptr[head->r.index])
 712                                 break;
 713                 if (head->r.index == TOMOYO_MAX_PROFILES)
 714                         return;
 715                 head->r.step++;
 716                 break;
 717         case 2:
 718                 {
 719                         u8 i;
 720                         const struct tomoyo_path_info *comment =
 721                                 profile->comment;
 722                         tomoyo_print_namespace(head);
 723                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 724                         tomoyo_set_string(head, comment ? comment->name : "");
 725                         tomoyo_set_lf(head);
 726                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 727                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 728                                 tomoyo_io_printf(head, "%s=%u ",
 729                                                  tomoyo_pref_keywords[i],
 730                                                  profile->pref[i]);
 731                         tomoyo_set_string(head, "}\n");
 732                         head->r.step++;
 733                 }
 734                 break;
 735         case 3:
 736                 {
 737                         tomoyo_print_namespace(head);
 738                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 739                         tomoyo_print_config(head, profile->default_config);
 740                         head->r.bit = 0;
 741                         head->r.step++;
 742                 }
 743                 break;
 744         case 4:
 745                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 746                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 747                         const u8 i = head->r.bit;
 748                         const u8 config = profile->config[i];
 749                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 750                                 continue;
 751                         tomoyo_print_namespace(head);
 752                         if (i < TOMOYO_MAX_MAC_INDEX)
 753                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 754                                                  index,
 755                                                  tomoyo_category_keywords
 756                                                  [tomoyo_index2category[i]],
 757                                                  tomoyo_mac_keywords[i]);
 758                         else
 759                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 760                                                  tomoyo_mac_keywords[i]);
 761                         tomoyo_print_config(head, config);
 762                         head->r.bit++;
 763                         break;
 764                 }
 765                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 766                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 767                         head->r.index++;
 768                         head->r.step = 1;
 769                 }
 770                 break;
 771         }
 772         if (tomoyo_flush(head))
 773                 goto next;
 774 }
 775
 776 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 777                                 const struct tomoyo_acl_head *b)
 778 {
 779         return container_of(a, struct tomoyo_manager, head)->manager ==
 780                 container_of(b, struct tomoyo_manager, head)->manager;
 781 }
 782
 783 /**
 784  * tomoyo_update_manager_entry - Add a manager entry.
 785  *
 786  * @manager:   The path to manager or the domainnamme.
 787  * @is_delete: True if it is a delete request.
 788  *
 789  * Returns 0 on success, negative value otherwise.
 790  *
 791  * Caller holds tomoyo_read_lock().
 792  */
 793 static int tomoyo_update_manager_entry(const char *manager,
 794                                        const bool is_delete)
 795 {
 796         struct tomoyo_manager e = { };
 797         struct tomoyo_acl_param param = {
 798                 /* .ns = &tomoyo_kernel_namespace, */
 799                 .is_delete = is_delete,
 800                 .list = &tomoyo_kernel_namespace.
 801                 policy_list[TOMOYO_ID_MANAGER],
 802         };
 803         int error = is_delete ? -ENOENT : -ENOMEM;
 804         if (tomoyo_domain_def(manager)) {
 805                 if (!tomoyo_correct_domain(manager))
 806                         return -EINVAL;
 807                 e.is_domain = true;
 808         } else {
 809                 if (!tomoyo_correct_path(manager))
 810                         return -EINVAL;
 811         }
 812         e.manager = tomoyo_get_name(manager);
 813         if (e.manager) {
 814                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 815                                              tomoyo_same_manager);
 816                 tomoyo_put_name(e.manager);
 817         }
 818         return error;
 819 }
 820
 821 /**
 822  * tomoyo_write_manager - Write manager policy.
 823  *
 824  * @head: Pointer to "struct tomoyo_io_buffer".
 825  *
 826  * Returns 0 on success, negative value otherwise.
 827  *
 828  * Caller holds tomoyo_read_lock().
 829  */
 830 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 831 {
 832         char *data = head->write_buf;
 833
 834         if (!strcmp(data, "manage_by_non_root")) {
 835                 tomoyo_manage_by_non_root = !head->w.is_delete;
 836                 return 0;
 837         }
 838         return tomoyo_update_manager_entry(data, head->w.is_delete);
 839 }
 840
 841 /**
 842  * tomoyo_read_manager - Read manager policy.
 843  *
 844  * @head: Pointer to "struct tomoyo_io_buffer".
 845  *
 846  * Caller holds tomoyo_read_lock().
 847  */
 848 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 849 {
 850         if (head->r.eof)
 851                 return;
 852         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
 853                              policy_list[TOMOYO_ID_MANAGER]) {
 854                 struct tomoyo_manager *ptr =
 855                         list_entry(head->r.acl, typeof(*ptr), head.list);
 856                 if (ptr->head.is_deleted)
 857                         continue;
 858                 if (!tomoyo_flush(head))
 859                         return;
 860                 tomoyo_set_string(head, ptr->manager->name);
 861                 tomoyo_set_lf(head);
 862         }
 863         head->r.eof = true;
 864 }
 865
 866 /**
 867  * tomoyo_manager - Check whether the current process is a policy manager.
 868  *
 869  * Returns true if the current process is permitted to modify policy
 870  * via /sys/kernel/security/tomoyo/ interface.
 871  *
 872  * Caller holds tomoyo_read_lock().
 873  */
 874 static bool tomoyo_manager(void)
 875 {
 876         struct tomoyo_manager *ptr;
 877         const char *exe;
 878         const struct task_struct *task = current;
 879         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 880         bool found = false;
 881
 882         if (!tomoyo_policy_loaded)
 883                 return true;
 884         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 885                 return false;
 886         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 887                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 888                 if (!ptr->head.is_deleted && ptr->is_domain
 889                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 890                         found = true;
 891                         break;
 892                 }
 893         }
 894         if (found)
 895                 return true;
 896         exe = tomoyo_get_exe();
 897         if (!exe)
 898                 return false;
 899         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 900                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 901                 if (!ptr->head.is_deleted && !ptr->is_domain
 902                     && !strcmp(exe, ptr->manager->name)) {
 903                         found = true;
 904                         break;
 905                 }
 906         }
 907         if (!found) { /* Reduce error messages. */
 908                 static pid_t last_pid;
 909                 const pid_t pid = current->pid;
 910                 if (last_pid != pid) {
 911                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 912                                "update policies.\n", domainname->name, exe);
 913                         last_pid = pid;
 914                 }
 915         }
 916         kfree(exe);
 917         return found;
 918 }
 919
 920 /**
 921  * tomoyo_select_domain - Parse select command.
 922  *
 923  * @head: Pointer to "struct tomoyo_io_buffer".
 924  * @data: String to parse.
 925  *
 926  * Returns true on success, false otherwise.
 927  *
 928  * Caller holds tomoyo_read_lock().
 929  */
 930 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 931                                  const char *data)
 932 {
 933         unsigned int pid;
 934         struct tomoyo_domain_info *domain = NULL;
 935         bool global_pid = false;
 936         if (strncmp(data, "select ", 7))
 937                 return false;
 938         data += 7;
 939         if (sscanf(data, "pid=%u", &pid) == 1 ||
 940             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 941                 struct task_struct *p;
 942                 rcu_read_lock();
 943                 read_lock(&tasklist_lock);
 944                 if (global_pid)
 945                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 946                 else
 947                         p = find_task_by_vpid(pid);
 948                 if (p)
 949                         domain = tomoyo_real_domain(p);
 950                 read_unlock(&tasklist_lock);
 951                 rcu_read_unlock();
 952         } else if (!strncmp(data, "domain=", 7)) {
 953                 if (tomoyo_domain_def(data + 7))
 954                         domain = tomoyo_find_domain(data + 7);
 955         } else
 956                 return false;
 957         head->w.domain = domain;
 958         /* Accessing read_buf is safe because head->io_sem is held. */
 959         if (!head->read_buf)
 960                 return true; /* Do nothing if open(O_WRONLY). */
 961         memset(&head->r, 0, sizeof(head->r));
 962         head->r.print_this_domain_only = true;
 963         if (domain)
 964                 head->r.domain = &domain->list;
 965         else
 966                 head->r.eof = 1;
 967         tomoyo_io_printf(head, "# select %s\n", data);
 968         if (domain && domain->is_deleted)
 969                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 970         return true;
 971 }
 972
 973 /**
 974  * tomoyo_delete_domain - Delete a domain.
 975  *
 976  * @domainname: The name of domain.
 977  *
 978  * Returns 0.
 979  *
 980  * Caller holds tomoyo_read_lock().
 981  */
 982 static int tomoyo_delete_domain(char *domainname)
 983 {
 984         struct tomoyo_domain_info *domain;
 985         struct tomoyo_path_info name;
 986
 987         name.name = domainname;
 988         tomoyo_fill_path_info(&name);
 989         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 990                 return 0;
 991         /* Is there an active domain? */
 992         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 993                 /* Never delete tomoyo_kernel_domain */
 994                 if (domain == &tomoyo_kernel_domain)
 995                         continue;
 996                 if (domain->is_deleted ||
 997                     tomoyo_pathcmp(domain->domainname, &name))
 998                         continue;
 999                 domain->is_deleted = true;
1000                 break;
1001         }
1002         mutex_unlock(&tomoyo_policy_lock);
1003         return 0;
1004 }
1005
1006 /**
1007  * tomoyo_write_domain2 - Write domain policy.
1008  *
1009  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1010  * @list:      Pointer to "struct list_head".
1011  * @data:      Policy to be interpreted.
1012  * @is_delete: True if it is a delete request.
1013  *
1014  * Returns 0 on success, negative value otherwise.
1015  *
1016  * Caller holds tomoyo_read_lock().
1017  */
1018 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1019                                 struct list_head *list, char *data,
1020                                 const bool is_delete)
1021 {
1022         struct tomoyo_acl_param param = {
1023                 .ns = ns,
1024                 .list = list,
1025                 .data = data,
1026                 .is_delete = is_delete,
1027         };
1028         static const struct {
1029                 const char *keyword;
1030                 int (*write) (struct tomoyo_acl_param *);
1031         } tomoyo_callback[1] = {
1032                 { "file ", tomoyo_write_file },
1033         };
1034         u8 i;
1035         for (i = 0; i < 1; i++) {
1036                 if (!tomoyo_str_starts(&param.data,
1037                                        tomoyo_callback[i].keyword))
1038                         continue;
1039                 return tomoyo_callback[i].write(&param);
1040         }
1041         return -EINVAL;
1042 }
1043
1044 /* String table for domain flags. */
1045 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1046         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1047         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1048 };
1049
1050 /**
1051  * tomoyo_write_domain - Write domain policy.
1052  *
1053  * @head: Pointer to "struct tomoyo_io_buffer".
1054  *
1055  * Returns 0 on success, negative value otherwise.
1056  *
1057  * Caller holds tomoyo_read_lock().
1058  */
1059 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1060 {
1061         char *data = head->write_buf;
1062         struct tomoyo_policy_namespace *ns;
1063         struct tomoyo_domain_info *domain = head->w.domain;
1064         const bool is_delete = head->w.is_delete;
1065         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1066         unsigned int profile;
1067         if (*data == '<') {
1068                 domain = NULL;
1069                 if (is_delete)
1070                         tomoyo_delete_domain(data);
1071                 else if (is_select)
1072                         domain = tomoyo_find_domain(data);
1073                 else
1074                         domain = tomoyo_assign_domain(data, false);
1075                 head->w.domain = domain;
1076                 return 0;
1077         }
1078         if (!domain)
1079                 return -EINVAL;
1080         ns = domain->ns;
1081         if (sscanf(data, "use_profile %u", &profile) == 1
1082             && profile < TOMOYO_MAX_PROFILES) {
1083                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1084                         domain->profile = (u8) profile;
1085                 return 0;
1086         }
1087         if (sscanf(data, "use_group %u\n", &profile) == 1
1088             && profile < TOMOYO_MAX_ACL_GROUPS) {
1089                 if (!is_delete)
1090                         domain->group = (u8) profile;
1091                 return 0;
1092         }
1093         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1094                 const char *cp = tomoyo_dif[profile];
1095                 if (strncmp(data, cp, strlen(cp) - 1))
1096                         continue;
1097                 domain->flags[profile] = !is_delete;
1098                 return 0;
1099         }
1100         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1101                                     is_delete);
1102 }
1103
1104 /**
1105  * tomoyo_print_condition - Print condition part.
1106  *
1107  * @head: Pointer to "struct tomoyo_io_buffer".
1108  * @cond: Pointer to "struct tomoyo_condition".
1109  *
1110  * Returns true on success, false otherwise.
1111  */
1112 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1113                                    const struct tomoyo_condition *cond)
1114 {
1115         switch (head->r.cond_step) {
1116         case 0:
1117                 head->r.cond_index = 0;
1118                 head->r.cond_step++;
1119                 /* fall through */
1120         case 1:
1121                 {
1122                         const u16 condc = cond->condc;
1123                         const struct tomoyo_condition_element *condp =
1124                                 (typeof(condp)) (cond + 1);
1125                         const struct tomoyo_number_union *numbers_p =
1126                                 (typeof(numbers_p)) (condp + condc);
1127                         const struct tomoyo_name_union *names_p =
1128                                 (typeof(names_p))
1129                                 (numbers_p + cond->numbers_count);
1130                         u16 skip;
1131                         for (skip = 0; skip < head->r.cond_index; skip++) {
1132                                 const u8 left = condp->left;
1133                                 const u8 right = condp->right;
1134                                 condp++;
1135                                 switch (left) {
1136                                 case TOMOYO_NUMBER_UNION:
1137                                         numbers_p++;
1138                                         break;
1139                                 }
1140                                 switch (right) {
1141                                 case TOMOYO_NAME_UNION:
1142                                         names_p++;
1143                                         break;
1144                                 case TOMOYO_NUMBER_UNION:
1145                                         numbers_p++;
1146                                         break;
1147                                 }
1148                         }
1149                         while (head->r.cond_index < condc) {
1150                                 const u8 match = condp->equals;
1151                                 const u8 left = condp->left;
1152                                 const u8 right = condp->right;
1153                                 if (!tomoyo_flush(head))
1154                                         return false;
1155                                 condp++;
1156                                 head->r.cond_index++;
1157                                 tomoyo_set_space(head);
1158                                 switch (left) {
1159                                 case TOMOYO_NUMBER_UNION:
1160                                         tomoyo_print_number_union_nospace
1161                                                 (head, numbers_p++);
1162                                         break;
1163                                 default:
1164                                         tomoyo_set_string(head,
1165                                                tomoyo_condition_keyword[left]);
1166                                         break;
1167                                 }
1168                                 tomoyo_set_string(head, match ? "=" : "!=");
1169                                 switch (right) {
1170                                 case TOMOYO_NAME_UNION:
1171                                         tomoyo_print_name_union_quoted
1172                                                 (head, names_p++);
1173                                         break;
1174                                 case TOMOYO_NUMBER_UNION:
1175                                         tomoyo_print_number_union_nospace
1176                                                 (head, numbers_p++);
1177                                         break;
1178                                 default:
1179                                         tomoyo_set_string(head,
1180                                           tomoyo_condition_keyword[right]);
1181                                         break;
1182                                 }
1183                         }
1184                 }
1185                 head->r.cond_step++;
1186                 /* fall through */
1187         case 2:
1188                 if (!tomoyo_flush(head))
1189                         break;
1190                 head->r.cond_step++;
1191                 /* fall through */
1192         case 3:
1193                 tomoyo_set_lf(head);
1194                 return true;
1195         }
1196         return false;
1197 }
1198
1199 /**
1200  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1201  *
1202  * @head:     Pointer to "struct tomoyo_io_buffer".
1203  * @category: Category name.
1204  *
1205  * Returns nothing.
1206  */
1207 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1208                              const char *category)
1209 {
1210         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1211                 tomoyo_print_namespace(head);
1212                 tomoyo_io_printf(head, "acl_group %u ",
1213                                  head->r.acl_group_index);
1214         }
1215         tomoyo_set_string(head, category);
1216 }
1217
1218 /**
1219  * tomoyo_print_entry - Print an ACL entry.
1220  *
1221  * @head: Pointer to "struct tomoyo_io_buffer".
1222  * @acl:  Pointer to an ACL entry.
1223  *
1224  * Returns true on success, false otherwise.
1225  */
1226 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1227                                struct tomoyo_acl_info *acl)
1228 {
1229         const u8 acl_type = acl->type;
1230         bool first = true;
1231         u8 bit;
1232
1233         if (head->r.print_cond_part)
1234                 goto print_cond_part;
1235         if (acl->is_deleted)
1236                 return true;
1237         if (!tomoyo_flush(head))
1238                 return false;
1239         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1240                 struct tomoyo_path_acl *ptr =
1241                         container_of(acl, typeof(*ptr), head);
1242                 const u16 perm = ptr->perm;
1243                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1244                         if (!(perm & (1 << bit)))
1245                                 continue;
1246                         if (head->r.print_transition_related_only &&
1247                             bit != TOMOYO_TYPE_EXECUTE)
1248                                 continue;
1249                         if (first) {
1250                                 tomoyo_set_group(head, "file ");
1251                                 first = false;
1252                         } else {
1253                                 tomoyo_set_slash(head);
1254                         }
1255                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1256                 }
1257                 if (first)
1258                         return true;
1259                 tomoyo_print_name_union(head, &ptr->name);
1260         } else if (head->r.print_transition_related_only) {
1261                 return true;
1262         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1263                 struct tomoyo_path2_acl *ptr =
1264                         container_of(acl, typeof(*ptr), head);
1265                 const u8 perm = ptr->perm;
1266                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1267                         if (!(perm & (1 << bit)))
1268                                 continue;
1269                         if (first) {
1270                                 tomoyo_set_group(head, "file ");
1271                                 first = false;
1272                         } else {
1273                                 tomoyo_set_slash(head);
1274                         }
1275                         tomoyo_set_string(head, tomoyo_mac_keywords
1276                                           [tomoyo_pp2mac[bit]]);
1277                 }
1278                 if (first)
1279                         return true;
1280                 tomoyo_print_name_union(head, &ptr->name1);
1281                 tomoyo_print_name_union(head, &ptr->name2);
1282         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1283                 struct tomoyo_path_number_acl *ptr =
1284                         container_of(acl, typeof(*ptr), head);
1285                 const u8 perm = ptr->perm;
1286                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1287                         if (!(perm & (1 << bit)))
1288                                 continue;
1289                         if (first) {
1290                                 tomoyo_set_group(head, "file ");
1291                                 first = false;
1292                         } else {
1293                                 tomoyo_set_slash(head);
1294                         }
1295                         tomoyo_set_string(head, tomoyo_mac_keywords
1296                                           [tomoyo_pn2mac[bit]]);
1297                 }
1298                 if (first)
1299                         return true;
1300                 tomoyo_print_name_union(head, &ptr->name);
1301                 tomoyo_print_number_union(head, &ptr->number);
1302         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1303                 struct tomoyo_mkdev_acl *ptr =
1304                         container_of(acl, typeof(*ptr), head);
1305                 const u8 perm = ptr->perm;
1306                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1307                         if (!(perm & (1 << bit)))
1308                                 continue;
1309                         if (first) {
1310                                 tomoyo_set_group(head, "file ");
1311                                 first = false;
1312                         } else {
1313                                 tomoyo_set_slash(head);
1314                         }
1315                         tomoyo_set_string(head, tomoyo_mac_keywords
1316                                           [tomoyo_pnnn2mac[bit]]);
1317                 }
1318                 if (first)
1319                         return true;
1320                 tomoyo_print_name_union(head, &ptr->name);
1321                 tomoyo_print_number_union(head, &ptr->mode);
1322                 tomoyo_print_number_union(head, &ptr->major);
1323                 tomoyo_print_number_union(head, &ptr->minor);
1324         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1325                 struct tomoyo_mount_acl *ptr =
1326                         container_of(acl, typeof(*ptr), head);
1327                 tomoyo_set_group(head, "file mount");
1328                 tomoyo_print_name_union(head, &ptr->dev_name);
1329                 tomoyo_print_name_union(head, &ptr->dir_name);
1330                 tomoyo_print_name_union(head, &ptr->fs_type);
1331                 tomoyo_print_number_union(head, &ptr->flags);
1332         }
1333         if (acl->cond) {
1334                 head->r.print_cond_part = true;
1335                 head->r.cond_step = 0;
1336                 if (!tomoyo_flush(head))
1337                         return false;
1338 print_cond_part:
1339                 if (!tomoyo_print_condition(head, acl->cond))
1340                         return false;
1341                 head->r.print_cond_part = false;
1342         } else {
1343                 tomoyo_set_lf(head);
1344         }
1345         return true;
1346 }
1347
1348 /**
1349  * tomoyo_read_domain2 - Read domain policy.
1350  *
1351  * @head: Pointer to "struct tomoyo_io_buffer".
1352  * @list: Pointer to "struct list_head".
1353  *
1354  * Caller holds tomoyo_read_lock().
1355  *
1356  * Returns true on success, false otherwise.
1357  */
1358 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1359                                 struct list_head *list)
1360 {
1361         list_for_each_cookie(head->r.acl, list) {
1362                 struct tomoyo_acl_info *ptr =
1363                         list_entry(head->r.acl, typeof(*ptr), list);
1364                 if (!tomoyo_print_entry(head, ptr))
1365                         return false;
1366         }
1367         head->r.acl = NULL;
1368         return true;
1369 }
1370
1371 /**
1372  * tomoyo_read_domain - Read domain policy.
1373  *
1374  * @head: Pointer to "struct tomoyo_io_buffer".
1375  *
1376  * Caller holds tomoyo_read_lock().
1377  */
1378 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1379 {
1380         if (head->r.eof)
1381                 return;
1382         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1383                 struct tomoyo_domain_info *domain =
1384                         list_entry(head->r.domain, typeof(*domain), list);
1385                 switch (head->r.step) {
1386                         u8 i;
1387                 case 0:
1388                         if (domain->is_deleted &&
1389                             !head->r.print_this_domain_only)
1390                                 continue;
1391                         /* Print domainname and flags. */
1392                         tomoyo_set_string(head, domain->domainname->name);
1393                         tomoyo_set_lf(head);
1394                         tomoyo_io_printf(head, "use_profile %u\n",
1395                                          domain->profile);
1396                         tomoyo_io_printf(head, "use_group %u\n",
1397                                          domain->group);
1398                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1399                                 if (domain->flags[i])
1400                                         tomoyo_set_string(head, tomoyo_dif[i]);
1401                         head->r.step++;
1402                         tomoyo_set_lf(head);
1403                         /* fall through */
1404                 case 1:
1405                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1406                                 return;
1407                         head->r.step++;
1408                         if (!tomoyo_set_lf(head))
1409                                 return;
1410                         /* fall through */
1411                 case 2:
1412                         head->r.step = 0;
1413                         if (head->r.print_this_domain_only)
1414                                 goto done;
1415                 }
1416         }
1417  done:
1418         head->r.eof = true;
1419 }
1420
1421 /**
1422  * tomoyo_write_pid: Specify PID to obtain domainname.
1423  *
1424  * @head: Pointer to "struct tomoyo_io_buffer".
1425  *
1426  * Returns 0.
1427  */
1428 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1429 {
1430         head->r.eof = false;
1431         return 0;
1432 }
1433
1434 /**
1435  * tomoyo_read_pid - Get domainname of the specified PID.
1436  *
1437  * @head: Pointer to "struct tomoyo_io_buffer".
1438  *
1439  * Returns the domainname which the specified PID is in on success,
1440  * empty string otherwise.
1441  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1442  * using read()/write() interface rather than sysctl() interface.
1443  */
1444 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1445 {
1446         char *buf = head->write_buf;
1447         bool global_pid = false;
1448         unsigned int pid;
1449         struct task_struct *p;
1450         struct tomoyo_domain_info *domain = NULL;
1451
1452         /* Accessing write_buf is safe because head->io_sem is held. */
1453         if (!buf) {
1454                 head->r.eof = true;
1455                 return; /* Do nothing if open(O_RDONLY). */
1456         }
1457         if (head->r.w_pos || head->r.eof)
1458                 return;
1459         head->r.eof = true;
1460         if (tomoyo_str_starts(&buf, "global-pid "))
1461                 global_pid = true;
1462         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1463         rcu_read_lock();
1464         read_lock(&tasklist_lock);
1465         if (global_pid)
1466                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1467         else
1468                 p = find_task_by_vpid(pid);
1469         if (p)
1470                 domain = tomoyo_real_domain(p);
1471         read_unlock(&tasklist_lock);
1472         rcu_read_unlock();
1473         if (!domain)
1474                 return;
1475         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1476         tomoyo_set_string(head, domain->domainname->name);
1477 }
1478
1479 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1480         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1481         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1482         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1483         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1484         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1485         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1486 };
1487
1488 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1489         [TOMOYO_PATH_GROUP]   = "path_group ",
1490         [TOMOYO_NUMBER_GROUP] = "number_group ",
1491 };
1492
1493 /**
1494  * tomoyo_write_exception - Write exception policy.
1495  *
1496  * @head: Pointer to "struct tomoyo_io_buffer".
1497  *
1498  * Returns 0 on success, negative value otherwise.
1499  *
1500  * Caller holds tomoyo_read_lock().
1501  */
1502 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1503 {
1504         const bool is_delete = head->w.is_delete;
1505         struct tomoyo_acl_param param = {
1506                 .ns = head->w.ns,
1507                 .is_delete = is_delete,
1508                 .data = head->write_buf,
1509         };
1510         u8 i;
1511         if (tomoyo_str_starts(&param.data, "aggregator "))
1512                 return tomoyo_write_aggregator(&param);
1513         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1514                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1515                         return tomoyo_write_transition_control(&param, i);
1516         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1517                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1518                         return tomoyo_write_group(&param, i);
1519         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1520                 unsigned int group;
1521                 char *data;
1522                 group = simple_strtoul(param.data, &data, 10);
1523                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1524                         return tomoyo_write_domain2
1525                                 (head->w.ns, &head->w.ns->acl_group[group],
1526                                  data, is_delete);
1527         }
1528         return -EINVAL;
1529 }
1530
1531 /**
1532  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1533  *
1534  * @head: Pointer to "struct tomoyo_io_buffer".
1535  * @idx:  Index number.
1536  *
1537  * Returns true on success, false otherwise.
1538  *
1539  * Caller holds tomoyo_read_lock().
1540  */
1541 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1542 {
1543         struct tomoyo_policy_namespace *ns =
1544                 container_of(head->r.ns, typeof(*ns), namespace_list);
1545         struct list_head *list = &ns->group_list[idx];
1546         list_for_each_cookie(head->r.group, list) {
1547                 struct tomoyo_group *group =
1548                         list_entry(head->r.group, typeof(*group), head.list);
1549                 list_for_each_cookie(head->r.acl, &group->member_list) {
1550                         struct tomoyo_acl_head *ptr =
1551                                 list_entry(head->r.acl, typeof(*ptr), list);
1552                         if (ptr->is_deleted)
1553                                 continue;
1554                         if (!tomoyo_flush(head))
1555                                 return false;
1556                         tomoyo_print_namespace(head);
1557                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1558                         tomoyo_set_string(head, group->group_name->name);
1559                         if (idx == TOMOYO_PATH_GROUP) {
1560                                 tomoyo_set_space(head);
1561                                 tomoyo_set_string(head, container_of
1562                                                (ptr, struct tomoyo_path_group,
1563                                                 head)->member_name->name);
1564                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1565                                 tomoyo_print_number_union(head, &container_of
1566                                                           (ptr,
1567                                                    struct tomoyo_number_group,
1568                                                            head)->number);
1569                         }
1570                         tomoyo_set_lf(head);
1571                 }
1572                 head->r.acl = NULL;
1573         }
1574         head->r.group = NULL;
1575         return true;
1576 }
1577
1578 /**
1579  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1580  *
1581  * @head: Pointer to "struct tomoyo_io_buffer".
1582  * @idx:  Index number.
1583  *
1584  * Returns true on success, false otherwise.
1585  *
1586  * Caller holds tomoyo_read_lock().
1587  */
1588 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1589 {
1590         struct tomoyo_policy_namespace *ns =
1591                 container_of(head->r.ns, typeof(*ns), namespace_list);
1592         struct list_head *list = &ns->policy_list[idx];
1593         list_for_each_cookie(head->r.acl, list) {
1594                 struct tomoyo_acl_head *acl =
1595                         container_of(head->r.acl, typeof(*acl), list);
1596                 if (acl->is_deleted)
1597                         continue;
1598                 if (!tomoyo_flush(head))
1599                         return false;
1600                 switch (idx) {
1601                 case TOMOYO_ID_TRANSITION_CONTROL:
1602                         {
1603                                 struct tomoyo_transition_control *ptr =
1604                                         container_of(acl, typeof(*ptr), head);
1605                                 tomoyo_print_namespace(head);
1606                                 tomoyo_set_string(head, tomoyo_transition_type
1607                                                   [ptr->type]);
1608                                 tomoyo_set_string(head, ptr->program ?
1609                                                   ptr->program->name : "any");
1610                                 tomoyo_set_string(head, " from ");
1611                                 tomoyo_set_string(head, ptr->domainname ?
1612                                                   ptr->domainname->name :
1613                                                   "any");
1614                         }
1615                         break;
1616                 case TOMOYO_ID_AGGREGATOR:
1617                         {
1618                                 struct tomoyo_aggregator *ptr =
1619                                         container_of(acl, typeof(*ptr), head);
1620                                 tomoyo_print_namespace(head);
1621                                 tomoyo_set_string(head, "aggregator ");
1622                                 tomoyo_set_string(head,
1623                                                   ptr->original_name->name);
1624                                 tomoyo_set_space(head);
1625                                 tomoyo_set_string(head,
1626                                                ptr->aggregated_name->name);
1627                         }
1628                         break;
1629                 default:
1630                         continue;
1631                 }
1632                 tomoyo_set_lf(head);
1633         }
1634         head->r.acl = NULL;
1635         return true;
1636 }
1637
1638 /**
1639  * tomoyo_read_exception - Read exception policy.
1640  *
1641  * @head: Pointer to "struct tomoyo_io_buffer".
1642  *
1643  * Caller holds tomoyo_read_lock().
1644  */
1645 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1646 {
1647         struct tomoyo_policy_namespace *ns =
1648                 container_of(head->r.ns, typeof(*ns), namespace_list);
1649         if (head->r.eof)
1650                 return;
1651         while (head->r.step < TOMOYO_MAX_POLICY &&
1652                tomoyo_read_policy(head, head->r.step))
1653                 head->r.step++;
1654         if (head->r.step < TOMOYO_MAX_POLICY)
1655                 return;
1656         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1657                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1658                 head->r.step++;
1659         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1660                 return;
1661         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1662                + TOMOYO_MAX_ACL_GROUPS) {
1663                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1664                         - TOMOYO_MAX_GROUP;
1665                 if (!tomoyo_read_domain2(head, &ns->acl_group
1666                                          [head->r.acl_group_index]))
1667                         return;
1668                 head->r.step++;
1669         }
1670         head->r.eof = true;
1671 }
1672
1673 /* Wait queue for kernel -> userspace notification. */
1674 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1675 /* Wait queue for userspace -> kernel notification. */
1676 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1677
1678 /* Structure for query. */
1679 struct tomoyo_query {
1680         struct list_head list;
1681         char *query;
1682         size_t query_len;
1683         unsigned int serial;
1684         u8 timer;
1685         u8 answer;
1686         u8 retry;
1687 };
1688
1689 /* The list for "struct tomoyo_query". */
1690 static LIST_HEAD(tomoyo_query_list);
1691
1692 /* Lock for manipulating tomoyo_query_list. */
1693 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1694
1695 /*
1696  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1697  * interface.
1698  */
1699 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1700
1701 /**
1702  * tomoyo_truncate - Truncate a line.
1703  *
1704  * @str: String to truncate.
1705  *
1706  * Returns length of truncated @str.
1707  */
1708 static int tomoyo_truncate(char *str)
1709 {
1710         char *start = str;
1711         while (*(unsigned char *) str > (unsigned char) ' ')
1712                 str++;
1713         *str = '\0';
1714         return strlen(start) + 1;
1715 }
1716
1717 /**
1718  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1719  *
1720  * @domain: Pointer to "struct tomoyo_domain_info".
1721  * @header: Lines containing ACL.
1722  *
1723  * Returns nothing.
1724  */
1725 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1726 {
1727         char *buffer;
1728         char *realpath = NULL;
1729         char *symlink = NULL;
1730         char *cp = strchr(header, '\n');
1731         int len;
1732         if (!cp)
1733                 return;
1734         cp = strchr(cp + 1, '\n');
1735         if (!cp)
1736                 return;
1737         *cp++ = '\0';
1738         len = strlen(cp) + 1;
1739         /* strstr() will return NULL if ordering is wrong. */
1740         if (*cp == 'f') {
1741                 realpath = strstr(header, " exec={ realpath=\"");
1742                 if (realpath) {
1743                         realpath += 8;
1744                         len += tomoyo_truncate(realpath) + 6;
1745                 }
1746                 symlink = strstr(header, " symlink.target=\"");
1747                 if (symlink)
1748                         len += tomoyo_truncate(symlink + 1) + 1;
1749         }
1750         buffer = kmalloc(len, GFP_NOFS);
1751         if (!buffer)
1752                 return;
1753         snprintf(buffer, len - 1, "%s", cp);
1754         if (realpath)
1755                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1756         if (symlink)
1757                 tomoyo_addprintf(buffer, len, "%s", symlink);
1758         tomoyo_normalize_line(buffer);
1759         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1760                                   false))
1761                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1762         kfree(buffer);
1763 }
1764
1765 /**
1766  * tomoyo_supervisor - Ask for the supervisor's decision.
1767  *
1768  * @r:   Pointer to "struct tomoyo_request_info".
1769  * @fmt: The printf()'s format string, followed by parameters.
1770  *
1771  * Returns 0 if the supervisor decided to permit the access request which
1772  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1773  * supervisor decided to retry the access request which violated the policy in
1774  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1775  */
1776 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1777 {
1778         va_list args;
1779         int error;
1780         int len;
1781         static unsigned int tomoyo_serial;
1782         struct tomoyo_query entry = { };
1783         bool quota_exceeded = false;
1784         va_start(args, fmt);
1785         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
1786         va_end(args);
1787         /* Write /sys/kernel/security/tomoyo/audit. */
1788         va_start(args, fmt);
1789         tomoyo_write_log2(r, len, fmt, args);
1790         va_end(args);
1791         /* Nothing more to do if granted. */
1792         if (r->granted)
1793                 return 0;
1794         if (r->mode)
1795                 tomoyo_update_stat(r->mode);
1796         switch (r->mode) {
1797         case TOMOYO_CONFIG_ENFORCING:
1798                 error = -EPERM;
1799                 if (atomic_read(&tomoyo_query_observers))
1800                         break;
1801                 goto out;
1802         case TOMOYO_CONFIG_LEARNING:
1803                 error = 0;
1804                 /* Check max_learning_entry parameter. */
1805                 if (tomoyo_domain_quota_is_ok(r))
1806                         break;
1807                 /* fall through */
1808         default:
1809                 return 0;
1810         }
1811         /* Get message. */
1812         va_start(args, fmt);
1813         entry.query = tomoyo_init_log(r, len, fmt, args);
1814         va_end(args);
1815         if (!entry.query)
1816                 goto out;
1817         entry.query_len = strlen(entry.query) + 1;
1818         if (!error) {
1819                 tomoyo_add_entry(r->domain, entry.query);
1820                 goto out;
1821         }
1822         len = tomoyo_round2(entry.query_len);
1823         spin_lock(&tomoyo_query_list_lock);
1824         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
1825             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
1826             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
1827                 quota_exceeded = true;
1828         } else {
1829                 entry.serial = tomoyo_serial++;
1830                 entry.retry = r->retry;
1831                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
1832                 list_add_tail(&entry.list, &tomoyo_query_list);
1833         }
1834         spin_unlock(&tomoyo_query_list_lock);
1835         if (quota_exceeded)
1836                 goto out;
1837         /* Give 10 seconds for supervisor's opinion. */
1838         while (entry.timer < 10) {
1839                 wake_up_all(&tomoyo_query_wait);
1840                 if (wait_event_interruptible_timeout
1841                     (tomoyo_answer_wait, entry.answer ||
1842                      !atomic_read(&tomoyo_query_observers), HZ))
1843                         break;
1844                 else
1845                         entry.timer++;
1846         }
1847         spin_lock(&tomoyo_query_list_lock);
1848         list_del(&entry.list);
1849         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
1850         spin_unlock(&tomoyo_query_list_lock);
1851         switch (entry.answer) {
1852         case 3: /* Asked to retry by administrator. */
1853                 error = TOMOYO_RETRY_REQUEST;
1854                 r->retry++;
1855                 break;
1856         case 1:
1857                 /* Granted by administrator. */
1858                 error = 0;
1859                 break;
1860         default:
1861                 /* Timed out or rejected by administrator. */
1862                 break;
1863         }
1864 out:
1865         kfree(entry.query);
1866         return error;
1867 }
1868
1869 /**
1870  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1871  *
1872  * @file: Pointer to "struct file".
1873  * @wait: Pointer to "poll_table".
1874  *
1875  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1876  *
1877  * Waits for access requests which violated policy in enforcing mode.
1878  */
1879 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1880 {
1881         struct list_head *tmp;
1882         bool found = false;
1883         u8 i;
1884         for (i = 0; i < 2; i++) {
1885                 spin_lock(&tomoyo_query_list_lock);
1886                 list_for_each(tmp, &tomoyo_query_list) {
1887                         struct tomoyo_query *ptr =
1888                                 list_entry(tmp, typeof(*ptr), list);
1889                         if (ptr->answer)
1890                                 continue;
1891                         found = true;
1892                         break;
1893                 }
1894                 spin_unlock(&tomoyo_query_list_lock);
1895                 if (found)
1896                         return POLLIN | POLLRDNORM;
1897                 if (i)
1898                         break;
1899                 poll_wait(file, &tomoyo_query_wait, wait);
1900         }
1901         return 0;
1902 }
1903
1904 /**
1905  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1906  *
1907  * @head: Pointer to "struct tomoyo_io_buffer".
1908  */
1909 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1910 {
1911         struct list_head *tmp;
1912         unsigned int pos = 0;
1913         size_t len = 0;
1914         char *buf;
1915         if (head->r.w_pos)
1916                 return;
1917         if (head->read_buf) {
1918                 kfree(head->read_buf);
1919                 head->read_buf = NULL;
1920         }
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->answer)
1925                         continue;
1926                 if (pos++ != head->r.query_index)
1927                         continue;
1928                 len = ptr->query_len;
1929                 break;
1930         }
1931         spin_unlock(&tomoyo_query_list_lock);
1932         if (!len) {
1933                 head->r.query_index = 0;
1934                 return;
1935         }
1936         buf = kzalloc(len + 32, GFP_NOFS);
1937         if (!buf)
1938                 return;
1939         pos = 0;
1940         spin_lock(&tomoyo_query_list_lock);
1941         list_for_each(tmp, &tomoyo_query_list) {
1942                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1943                 if (ptr->answer)
1944                         continue;
1945                 if (pos++ != head->r.query_index)
1946                         continue;
1947                 /*
1948                  * Some query can be skipped because tomoyo_query_list
1949                  * can change, but I don't care.
1950                  */
1951                 if (len == ptr->query_len)
1952                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
1953                                  ptr->retry, ptr->query);
1954                 break;
1955         }
1956         spin_unlock(&tomoyo_query_list_lock);
1957         if (buf[0]) {
1958                 head->read_buf = buf;
1959                 head->r.w[head->r.w_pos++] = buf;
1960                 head->r.query_index++;
1961         } else {
1962                 kfree(buf);
1963         }
1964 }
1965
1966 /**
1967  * tomoyo_write_answer - Write the supervisor's decision.
1968  *
1969  * @head: Pointer to "struct tomoyo_io_buffer".
1970  *
1971  * Returns 0 on success, -EINVAL otherwise.
1972  */
1973 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1974 {
1975         char *data = head->write_buf;
1976         struct list_head *tmp;
1977         unsigned int serial;
1978         unsigned int answer;
1979         spin_lock(&tomoyo_query_list_lock);
1980         list_for_each(tmp, &tomoyo_query_list) {
1981                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1982                 ptr->timer = 0;
1983         }
1984         spin_unlock(&tomoyo_query_list_lock);
1985         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1986                 return -EINVAL;
1987         spin_lock(&tomoyo_query_list_lock);
1988         list_for_each(tmp, &tomoyo_query_list) {
1989                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1990                 if (ptr->serial != serial)
1991                         continue;
1992                 if (!ptr->answer)
1993                         ptr->answer = answer;
1994                 break;
1995         }
1996         spin_unlock(&tomoyo_query_list_lock);
1997         return 0;
1998 }
1999
2000 /**
2001  * tomoyo_read_version: Get version.
2002  *
2003  * @head: Pointer to "struct tomoyo_io_buffer".
2004  *
2005  * Returns version information.
2006  */
2007 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2008 {
2009         if (!head->r.eof) {
2010                 tomoyo_io_printf(head, "2.4.0");
2011                 head->r.eof = true;
2012         }
2013 }
2014
2015 /**
2016  * tomoyo_read_self_domain - Get the current process's domainname.
2017  *
2018  * @head: Pointer to "struct tomoyo_io_buffer".
2019  *
2020  * Returns the current process's domainname.
2021  */
2022 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
2023 {
2024         if (!head->r.eof) {
2025                 /*
2026                  * tomoyo_domain()->domainname != NULL
2027                  * because every process belongs to a domain and
2028                  * the domain's name cannot be NULL.
2029                  */
2030                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
2031                 head->r.eof = true;
2032         }
2033 }
2034
2035 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2036 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2037         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2038         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2039         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2040         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2041 };
2042
2043 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2044 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2045         [TOMOYO_MEMORY_POLICY] = "policy:",
2046         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2047         [TOMOYO_MEMORY_QUERY]  = "query message:",
2048 };
2049
2050 /* Timestamp counter for last updated. */
2051 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2052 /* Counter for number of updates. */
2053 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2054
2055 /**
2056  * tomoyo_update_stat - Update statistic counters.
2057  *
2058  * @index: Index for policy type.
2059  *
2060  * Returns nothing.
2061  */
2062 void tomoyo_update_stat(const u8 index)
2063 {
2064         struct timeval tv;
2065         do_gettimeofday(&tv);
2066         /*
2067          * I don't use atomic operations because race condition is not fatal.
2068          */
2069         tomoyo_stat_updated[index]++;
2070         tomoyo_stat_modified[index] = tv.tv_sec;
2071 }
2072
2073 /**
2074  * tomoyo_read_stat - Read statistic data.
2075  *
2076  * @head: Pointer to "struct tomoyo_io_buffer".
2077  *
2078  * Returns nothing.
2079  */
2080 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2081 {
2082         u8 i;
2083         unsigned int total = 0;
2084         if (head->r.eof)
2085                 return;
2086         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2087                 tomoyo_io_printf(head, "Policy %-30s %10u",
2088                                  tomoyo_policy_headers[i],
2089                                  tomoyo_stat_updated[i]);
2090                 if (tomoyo_stat_modified[i]) {
2091                         struct tomoyo_time stamp;
2092                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2093                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2094                                          "%02u:%02u:%02u)",
2095                                          stamp.year, stamp.month, stamp.day,
2096                                          stamp.hour, stamp.min, stamp.sec);
2097                 }
2098                 tomoyo_set_lf(head);
2099         }
2100         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2101                 unsigned int used = tomoyo_memory_used[i];
2102                 total += used;
2103                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2104                                  tomoyo_memory_headers[i], used);
2105                 used = tomoyo_memory_quota[i];
2106                 if (used)
2107                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2108                 tomoyo_set_lf(head);
2109         }
2110         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2111                          total);
2112         head->r.eof = true;
2113 }
2114
2115 /**
2116  * tomoyo_write_stat - Set memory quota.
2117  *
2118  * @head: Pointer to "struct tomoyo_io_buffer".
2119  *
2120  * Returns 0.
2121  */
2122 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2123 {
2124         char *data = head->write_buf;
2125         u8 i;
2126         if (tomoyo_str_starts(&data, "Memory used by "))
2127                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2128                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2129                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2130         return 0;
2131 }
2132
2133 /**
2134  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2135  *
2136  * @type: Type of interface.
2137  * @file: Pointer to "struct file".
2138  *
2139  * Returns 0 on success, negative value otherwise.
2140  */
2141 int tomoyo_open_control(const u8 type, struct file *file)
2142 {
2143         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2144
2145         if (!head)
2146                 return -ENOMEM;
2147         mutex_init(&head->io_sem);
2148         head->type = type;
2149         switch (type) {
2150         case TOMOYO_DOMAINPOLICY:
2151                 /* /sys/kernel/security/tomoyo/domain_policy */
2152                 head->write = tomoyo_write_domain;
2153                 head->read = tomoyo_read_domain;
2154                 break;
2155         case TOMOYO_EXCEPTIONPOLICY:
2156                 /* /sys/kernel/security/tomoyo/exception_policy */
2157                 head->write = tomoyo_write_exception;
2158                 head->read = tomoyo_read_exception;
2159                 break;
2160         case TOMOYO_AUDIT:
2161                 /* /sys/kernel/security/tomoyo/audit */
2162                 head->poll = tomoyo_poll_log;
2163                 head->read = tomoyo_read_log;
2164                 break;
2165         case TOMOYO_SELFDOMAIN:
2166                 /* /sys/kernel/security/tomoyo/self_domain */
2167                 head->read = tomoyo_read_self_domain;
2168                 break;
2169         case TOMOYO_PROCESS_STATUS:
2170                 /* /sys/kernel/security/tomoyo/.process_status */
2171                 head->write = tomoyo_write_pid;
2172                 head->read = tomoyo_read_pid;
2173                 break;
2174         case TOMOYO_VERSION:
2175                 /* /sys/kernel/security/tomoyo/version */
2176                 head->read = tomoyo_read_version;
2177                 head->readbuf_size = 128;
2178                 break;
2179         case TOMOYO_STAT:
2180                 /* /sys/kernel/security/tomoyo/stat */
2181                 head->write = tomoyo_write_stat;
2182                 head->read = tomoyo_read_stat;
2183                 head->readbuf_size = 1024;
2184                 break;
2185         case TOMOYO_PROFILE:
2186                 /* /sys/kernel/security/tomoyo/profile */
2187                 head->write = tomoyo_write_profile;
2188                 head->read = tomoyo_read_profile;
2189                 break;
2190         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2191                 head->poll = tomoyo_poll_query;
2192                 head->write = tomoyo_write_answer;
2193                 head->read = tomoyo_read_query;
2194                 break;
2195         case TOMOYO_MANAGER:
2196                 /* /sys/kernel/security/tomoyo/manager */
2197                 head->write = tomoyo_write_manager;
2198                 head->read = tomoyo_read_manager;
2199                 break;
2200         }
2201         if (!(file->f_mode & FMODE_READ)) {
2202                 /*
2203                  * No need to allocate read_buf since it is not opened
2204                  * for reading.
2205                  */
2206                 head->read = NULL;
2207                 head->poll = NULL;
2208         } else if (!head->poll) {
2209                 /* Don't allocate read_buf for poll() access. */
2210                 if (!head->readbuf_size)
2211                         head->readbuf_size = 4096 * 2;
2212                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2213                 if (!head->read_buf) {
2214                         kfree(head);
2215                         return -ENOMEM;
2216                 }
2217         }
2218         if (!(file->f_mode & FMODE_WRITE)) {
2219                 /*
2220                  * No need to allocate write_buf since it is not opened
2221                  * for writing.
2222                  */
2223                 head->write = NULL;
2224         } else if (head->write) {
2225                 head->writebuf_size = 4096 * 2;
2226                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2227                 if (!head->write_buf) {
2228                         kfree(head->read_buf);
2229                         kfree(head);
2230                         return -ENOMEM;
2231                 }
2232         }
2233         /*
2234          * If the file is /sys/kernel/security/tomoyo/query , increment the
2235          * observer counter.
2236          * The obserber counter is used by tomoyo_supervisor() to see if
2237          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2238          */
2239         if (type == TOMOYO_QUERY)
2240                 atomic_inc(&tomoyo_query_observers);
2241         file->private_data = head;
2242         tomoyo_notify_gc(head, true);
2243         return 0;
2244 }
2245
2246 /**
2247  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2248  *
2249  * @file: Pointer to "struct file".
2250  * @wait: Pointer to "poll_table".
2251  *
2252  * Waits for read readiness.
2253  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2254  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2255  */
2256 int tomoyo_poll_control(struct file *file, poll_table *wait)
2257 {
2258         struct tomoyo_io_buffer *head = file->private_data;
2259         if (!head->poll)
2260                 return -ENOSYS;
2261         return head->poll(file, wait);
2262 }
2263
2264 /**
2265  * tomoyo_set_namespace_cursor - Set namespace to read.
2266  *
2267  * @head: Pointer to "struct tomoyo_io_buffer".
2268  *
2269  * Returns nothing.
2270  */
2271 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2272 {
2273         struct list_head *ns;
2274         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2275             head->type != TOMOYO_PROFILE)
2276                 return;
2277         /*
2278          * If this is the first read, or reading previous namespace finished
2279          * and has more namespaces to read, update the namespace cursor.
2280          */
2281         ns = head->r.ns;
2282         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2283                 /* Clearing is OK because tomoyo_flush() returned true. */
2284                 memset(&head->r, 0, sizeof(head->r));
2285                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2286         }
2287 }
2288
2289 /**
2290  * tomoyo_has_more_namespace - Check for unread namespaces.
2291  *
2292  * @head: Pointer to "struct tomoyo_io_buffer".
2293  *
2294  * Returns true if we have more entries to print, false otherwise.
2295  */
2296 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2297 {
2298         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2299                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2300                 head->r.ns->next != &tomoyo_namespace_list;
2301 }
2302
2303 /**
2304  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2305  *
2306  * @head:       Pointer to "struct tomoyo_io_buffer".
2307  * @buffer:     Poiner to buffer to write to.
2308  * @buffer_len: Size of @buffer.
2309  *
2310  * Returns bytes read on success, negative value otherwise.
2311  */
2312 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2313                             const int buffer_len)
2314 {
2315         int len;
2316         int idx;
2317
2318         if (!head->read)
2319                 return -ENOSYS;
2320         if (mutex_lock_interruptible(&head->io_sem))
2321                 return -EINTR;
2322         head->read_user_buf = buffer;
2323         head->read_user_buf_avail = buffer_len;
2324         idx = tomoyo_read_lock();
2325         if (tomoyo_flush(head))
2326                 /* Call the policy handler. */
2327                 do {
2328                         tomoyo_set_namespace_cursor(head);
2329                         head->read(head);
2330                 } while (tomoyo_flush(head) &&
2331                          tomoyo_has_more_namespace(head));
2332         tomoyo_read_unlock(idx);
2333         len = head->read_user_buf - buffer;
2334         mutex_unlock(&head->io_sem);
2335         return len;
2336 }
2337
2338 /**
2339  * tomoyo_parse_policy - Parse a policy line.
2340  *
2341  * @head: Poiter to "struct tomoyo_io_buffer".
2342  * @line: Line to parse.
2343  *
2344  * Returns 0 on success, negative value otherwise.
2345  *
2346  * Caller holds tomoyo_read_lock().
2347  */
2348 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2349 {
2350         /* Delete request? */
2351         head->w.is_delete = !strncmp(line, "delete ", 7);
2352         if (head->w.is_delete)
2353                 memmove(line, line + 7, strlen(line + 7) + 1);
2354         /* Selecting namespace to update. */
2355         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2356             head->type == TOMOYO_PROFILE) {
2357                 if (*line == '<') {
2358                         char *cp = strchr(line, ' ');
2359                         if (cp) {
2360                                 *cp++ = '\0';
2361                                 head->w.ns = tomoyo_assign_namespace(line);
2362                                 memmove(line, cp, strlen(cp) + 1);
2363                         } else
2364                                 head->w.ns = NULL;
2365                 } else
2366                         head->w.ns = &tomoyo_kernel_namespace;
2367                 /* Don't allow updating if namespace is invalid. */
2368                 if (!head->w.ns)
2369                         return -ENOENT;
2370         }
2371         /* Do the update. */
2372         return head->write(head);
2373 }
2374
2375 /**
2376  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2377  *
2378  * @head:       Pointer to "struct tomoyo_io_buffer".
2379  * @buffer:     Pointer to buffer to read from.
2380  * @buffer_len: Size of @buffer.
2381  *
2382  * Returns @buffer_len on success, negative value otherwise.
2383  */
2384 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2385                              const char __user *buffer, const int buffer_len)
2386 {
2387         int error = buffer_len;
2388         size_t avail_len = buffer_len;
2389         char *cp0 = head->write_buf;
2390         int idx;
2391         if (!head->write)
2392                 return -ENOSYS;
2393         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2394                 return -EFAULT;
2395         if (mutex_lock_interruptible(&head->io_sem))
2396                 return -EINTR;
2397         idx = tomoyo_read_lock();
2398         /* Read a line and dispatch it to the policy handler. */
2399         while (avail_len > 0) {
2400                 char c;
2401                 if (head->w.avail >= head->writebuf_size - 1) {
2402                         const int len = head->writebuf_size * 2;
2403                         char *cp = kzalloc(len, GFP_NOFS);
2404                         if (!cp) {
2405                                 error = -ENOMEM;
2406                                 break;
2407                         }
2408                         memmove(cp, cp0, head->w.avail);
2409                         kfree(cp0);
2410                         head->write_buf = cp;
2411                         cp0 = cp;
2412                         head->writebuf_size = len;
2413                 }
2414                 if (get_user(c, buffer)) {
2415                         error = -EFAULT;
2416                         break;
2417                 }
2418                 buffer++;
2419                 avail_len--;
2420                 cp0[head->w.avail++] = c;
2421                 if (c != '\n')
2422                         continue;
2423                 cp0[head->w.avail - 1] = '\0';
2424                 head->w.avail = 0;
2425                 tomoyo_normalize_line(cp0);
2426                 if (!strcmp(cp0, "reset")) {
2427                         head->w.ns = &tomoyo_kernel_namespace;
2428                         head->w.domain = NULL;
2429                         memset(&head->r, 0, sizeof(head->r));
2430                         continue;
2431                 }
2432                 /* Don't allow updating policies by non manager programs. */
2433                 switch (head->type) {
2434                 case TOMOYO_PROCESS_STATUS:
2435                         /* This does not write anything. */
2436                         break;
2437                 case TOMOYO_DOMAINPOLICY:
2438                         if (tomoyo_select_domain(head, cp0))
2439                                 continue;
2440                         /* fall through */
2441                 case TOMOYO_EXCEPTIONPOLICY:
2442                         if (!strcmp(cp0, "select transition_only")) {
2443                                 head->r.print_transition_related_only = true;
2444                                 continue;
2445                         }
2446                         /* fall through */
2447                 default:
2448                         if (!tomoyo_manager()) {
2449                                 error = -EPERM;
2450                                 goto out;
2451                         }
2452                 }
2453                 switch (tomoyo_parse_policy(head, cp0)) {
2454                 case -EPERM:
2455                         error = -EPERM;
2456                         goto out;
2457                 case 0:
2458                         switch (head->type) {
2459                         case TOMOYO_DOMAINPOLICY:
2460                         case TOMOYO_EXCEPTIONPOLICY:
2461                         case TOMOYO_STAT:
2462                         case TOMOYO_PROFILE:
2463                         case TOMOYO_MANAGER:
2464                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2465                                 break;
2466                         default:
2467                                 break;
2468                         }
2469                         break;
2470                 }
2471         }
2472 out:
2473         tomoyo_read_unlock(idx);
2474         mutex_unlock(&head->io_sem);
2475         return error;
2476 }
2477
2478 /**
2479  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2480  *
2481  * @head: Pointer to "struct tomoyo_io_buffer".
2482  *
2483  * Returns 0.
2484  */
2485 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2486 {
2487         /*
2488          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2489          * observer counter.
2490          */
2491         if (head->type == TOMOYO_QUERY &&
2492             atomic_dec_and_test(&tomoyo_query_observers))
2493                 wake_up_all(&tomoyo_answer_wait);
2494         tomoyo_notify_gc(head, false);
2495         return 0;
2496 }
2497
2498 /**
2499  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2500  */
2501 void tomoyo_check_profile(void)
2502 {
2503         struct tomoyo_domain_info *domain;
2504         const int idx = tomoyo_read_lock();
2505         tomoyo_policy_loaded = true;
2506         printk(KERN_INFO "TOMOYO: 2.4.0\n");
2507         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2508                 const u8 profile = domain->profile;
2509                 const struct tomoyo_policy_namespace *ns = domain->ns;
2510                 if (ns->profile_version != 20100903)
2511                         printk(KERN_ERR
2512                                "Profile version %u is not supported.\n",
2513                                ns->profile_version);
2514                 else if (!ns->profile_ptr[profile])
2515                         printk(KERN_ERR
2516                                "Profile %u (used by '%s') is not defined.\n",
2517                                profile, domain->domainname->name);
2518                 else
2519                         continue;
2520                 printk(KERN_ERR
2521                        "Userland tools for TOMOYO 2.4 must be installed and "
2522                        "policy must be initialized.\n");
2523                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.4/ "
2524                        "for more information.\n");
2525                 panic("STOP!");
2526         }
2527         tomoyo_read_unlock(idx);
2528         printk(KERN_INFO "Mandatory Access Control activated.\n");
2529 }
2530
2531 /**
2532  * tomoyo_load_builtin_policy - Load built-in policy.
2533  *
2534  * Returns nothing.
2535  */
2536 void __init tomoyo_load_builtin_policy(void)
2537 {
2538         /*
2539          * This include file is manually created and contains built-in policy
2540          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2541          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2542          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2543          */
2544 #include "builtin-policy.h"
2545         u8 i;
2546         const int idx = tomoyo_read_lock();
2547         for (i = 0; i < 5; i++) {
2548                 struct tomoyo_io_buffer head = { };
2549                 char *start = "";
2550                 switch (i) {
2551                 case 0:
2552                         start = tomoyo_builtin_profile;
2553                         head.type = TOMOYO_PROFILE;
2554                         head.write = tomoyo_write_profile;
2555                         break;
2556                 case 1:
2557                         start = tomoyo_builtin_exception_policy;
2558                         head.type = TOMOYO_EXCEPTIONPOLICY;
2559                         head.write = tomoyo_write_exception;
2560                         break;
2561                 case 2:
2562                         start = tomoyo_builtin_domain_policy;
2563                         head.type = TOMOYO_DOMAINPOLICY;
2564                         head.write = tomoyo_write_domain;
2565                         break;
2566                 case 3:
2567                         start = tomoyo_builtin_manager;
2568                         head.type = TOMOYO_MANAGER;
2569                         head.write = tomoyo_write_manager;
2570                         break;
2571                 case 4:
2572                         start = tomoyo_builtin_stat;
2573                         head.type = TOMOYO_STAT;
2574                         head.write = tomoyo_write_stat;
2575                         break;
2576                 }
2577                 while (1) {
2578                         char *end = strchr(start, '\n');
2579                         if (!end)
2580                                 break;
2581                         *end = '\0';
2582                         tomoyo_normalize_line(start);
2583                         head.write_buf = start;
2584                         tomoyo_parse_policy(&head, start);
2585                         start = end + 1;
2586                 }
2587         }
2588         tomoyo_read_unlock(idx);
2589 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2590         tomoyo_check_profile();
2591 #endif
2592 }