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 /* Profile version. Currently only 20090903 is defined. */
  15 static unsigned int tomoyo_profile_version;
  16
  17 /* Profile table. Memory is allocated as needed. */
  18 static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
  19
  20 /* String table for operation mode. */
  21 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
  22         [TOMOYO_CONFIG_DISABLED]   = "disabled",
  23         [TOMOYO_CONFIG_LEARNING]   = "learning",
  24         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
  25         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
  26 };
  27
  28 /* String table for /sys/kernel/security/tomoyo/profile */
  29 static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
  30                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
  31         [TOMOYO_MAC_FILE_EXECUTE]    = "file::execute",
  32         [TOMOYO_MAC_FILE_OPEN]       = "file::open",
  33         [TOMOYO_MAC_FILE_CREATE]     = "file::create",
  34         [TOMOYO_MAC_FILE_UNLINK]     = "file::unlink",
  35         [TOMOYO_MAC_FILE_GETATTR]    = "file::getattr",
  36         [TOMOYO_MAC_FILE_MKDIR]      = "file::mkdir",
  37         [TOMOYO_MAC_FILE_RMDIR]      = "file::rmdir",
  38         [TOMOYO_MAC_FILE_MKFIFO]     = "file::mkfifo",
  39         [TOMOYO_MAC_FILE_MKSOCK]     = "file::mksock",
  40         [TOMOYO_MAC_FILE_TRUNCATE]   = "file::truncate",
  41         [TOMOYO_MAC_FILE_SYMLINK]    = "file::symlink",
  42         [TOMOYO_MAC_FILE_MKBLOCK]    = "file::mkblock",
  43         [TOMOYO_MAC_FILE_MKCHAR]     = "file::mkchar",
  44         [TOMOYO_MAC_FILE_LINK]       = "file::link",
  45         [TOMOYO_MAC_FILE_RENAME]     = "file::rename",
  46         [TOMOYO_MAC_FILE_CHMOD]      = "file::chmod",
  47         [TOMOYO_MAC_FILE_CHOWN]      = "file::chown",
  48         [TOMOYO_MAC_FILE_CHGRP]      = "file::chgrp",
  49         [TOMOYO_MAC_FILE_IOCTL]      = "file::ioctl",
  50         [TOMOYO_MAC_FILE_CHROOT]     = "file::chroot",
  51         [TOMOYO_MAC_FILE_MOUNT]      = "file::mount",
  52         [TOMOYO_MAC_FILE_UMOUNT]     = "file::unmount",
  53         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
  54         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  55 };
  56
  57 /* String table for PREFERENCE keyword. */
  58 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
  59         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
  60         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
  61 };
  62
  63 /* Permit policy management by non-root user? */
  64 static bool tomoyo_manage_by_non_root;
  65
  66 /* Utility functions. */
  67
  68 /**
  69  * tomoyo_yesno - Return "yes" or "no".
  70  *
  71  * @value: Bool value.
  72  */
  73 const char *tomoyo_yesno(const unsigned int value)
  74 {
  75         return value ? "yes" : "no";
  76 }
  77
  78 /**
  79  * tomoyo_addprintf - strncat()-like-snprintf().
  80  *
  81  * @buffer: Buffer to write to. Must be '\0'-terminated.
  82  * @len:    Size of @buffer.
  83  * @fmt:    The printf()'s format string, followed by parameters.
  84  *
  85  * Returns nothing.
  86  */
  87 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
  88 {
  89         va_list args;
  90         const int pos = strlen(buffer);
  91         va_start(args, fmt);
  92         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
  93         va_end(args);
  94 }
  95
  96 /**
  97  * tomoyo_flush - Flush queued string to userspace's buffer.
  98  *
  99  * @head:   Pointer to "struct tomoyo_io_buffer".
 100  *
 101  * Returns true if all data was flushed, false otherwise.
 102  */
 103 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 104 {
 105         while (head->r.w_pos) {
 106                 const char *w = head->r.w[0];
 107                 int len = strlen(w);
 108                 if (len) {
 109                         if (len > head->read_user_buf_avail)
 110                                 len = head->read_user_buf_avail;
 111                         if (!len)
 112                                 return false;
 113                         if (copy_to_user(head->read_user_buf, w, len))
 114                                 return false;
 115                         head->read_user_buf_avail -= len;
 116                         head->read_user_buf += len;
 117                         w += len;
 118                 }
 119                 head->r.w[0] = w;
 120                 if (*w)
 121                         return false;
 122                 /* Add '\0' for audit logs and query. */
 123                 if (head->poll) {
 124                         if (!head->read_user_buf_avail ||
 125                             copy_to_user(head->read_user_buf, "", 1))
 126                                 return false;
 127                         head->read_user_buf_avail--;
 128                         head->read_user_buf++;
 129                 }
 130                 head->r.w_pos--;
 131                 for (len = 0; len < head->r.w_pos; len++)
 132                         head->r.w[len] = head->r.w[len + 1];
 133         }
 134         head->r.avail = 0;
 135         return true;
 136 }
 137
 138 /**
 139  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 140  *
 141  * @head:   Pointer to "struct tomoyo_io_buffer".
 142  * @string: String to print.
 143  *
 144  * Note that @string has to be kept valid until @head is kfree()d.
 145  * This means that char[] allocated on stack memory cannot be passed to
 146  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 147  */
 148 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 149 {
 150         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 151                 head->r.w[head->r.w_pos++] = string;
 152                 tomoyo_flush(head);
 153         } else
 154                 WARN_ON(1);
 155 }
 156
 157 /**
 158  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 159  *
 160  * @head: Pointer to "struct tomoyo_io_buffer".
 161  * @fmt:  The printf()'s format string, followed by parameters.
 162  */
 163 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 164 {
 165         va_list args;
 166         int len;
 167         int pos = head->r.avail;
 168         int size = head->readbuf_size - pos;
 169         if (size <= 0)
 170                 return;
 171         va_start(args, fmt);
 172         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 173         va_end(args);
 174         if (pos + len >= head->readbuf_size) {
 175                 WARN_ON(1);
 176                 return;
 177         }
 178         head->r.avail += len;
 179         tomoyo_set_string(head, head->read_buf + pos);
 180 }
 181
 182 /**
 183  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 184  *
 185  * @head: Pointer to "struct tomoyo_io_buffer".
 186  *
 187  * Returns nothing.
 188  */
 189 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 190 {
 191         tomoyo_set_string(head, " ");
 192 }
 193
 194 /**
 195  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 196  *
 197  * @head: Pointer to "struct tomoyo_io_buffer".
 198  *
 199  * Returns nothing.
 200  */
 201 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 202 {
 203         tomoyo_set_string(head, "\n");
 204         return !head->r.w_pos;
 205 }
 206
 207 /**
 208  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 209  *
 210  * @head: Pointer to "struct tomoyo_io_buffer".
 211  *
 212  * Returns nothing.
 213  */
 214 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 215 {
 216         tomoyo_set_string(head, "/");
 217 }
 218
 219 /**
 220  * tomoyo_print_name_union - Print a tomoyo_name_union.
 221  *
 222  * @head: Pointer to "struct tomoyo_io_buffer".
 223  * @ptr:  Pointer to "struct tomoyo_name_union".
 224  */
 225 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 226                                     const struct tomoyo_name_union *ptr)
 227 {
 228         tomoyo_set_space(head);
 229         if (ptr->group) {
 230                 tomoyo_set_string(head, "@");
 231                 tomoyo_set_string(head, ptr->group->group_name->name);
 232         } else {
 233                 tomoyo_set_string(head, ptr->filename->name);
 234         }
 235 }
 236
 237 /**
 238  * tomoyo_print_number_union - Print a tomoyo_number_union.
 239  *
 240  * @head:       Pointer to "struct tomoyo_io_buffer".
 241  * @ptr:        Pointer to "struct tomoyo_number_union".
 242  */
 243 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 244                                       const struct tomoyo_number_union *ptr)
 245 {
 246         tomoyo_set_space(head);
 247         if (ptr->group) {
 248                 tomoyo_set_string(head, "@");
 249                 tomoyo_set_string(head, ptr->group->group_name->name);
 250         } else {
 251                 int i;
 252                 unsigned long min = ptr->values[0];
 253                 const unsigned long max = ptr->values[1];
 254                 u8 min_type = ptr->value_type[0];
 255                 const u8 max_type = ptr->value_type[1];
 256                 char buffer[128];
 257                 buffer[0] = '\0';
 258                 for (i = 0; i < 2; i++) {
 259                         switch (min_type) {
 260                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 261                                 tomoyo_addprintf(buffer, sizeof(buffer),
 262                                                  "0x%lX", min);
 263                                 break;
 264                         case TOMOYO_VALUE_TYPE_OCTAL:
 265                                 tomoyo_addprintf(buffer, sizeof(buffer),
 266                                                  "0%lo", min);
 267                                 break;
 268                         default:
 269                                 tomoyo_addprintf(buffer, sizeof(buffer),
 270                                                  "%lu", min);
 271                                 break;
 272                         }
 273                         if (min == max && min_type == max_type)
 274                                 break;
 275                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 276                         min_type = max_type;
 277                         min = max;
 278                 }
 279                 tomoyo_io_printf(head, "%s", buffer);
 280         }
 281 }
 282
 283 /**
 284  * tomoyo_assign_profile - Create a new profile.
 285  *
 286  * @profile: Profile number to create.
 287  *
 288  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 289  */
 290 static struct tomoyo_profile *tomoyo_assign_profile(const unsigned int profile)
 291 {
 292         struct tomoyo_profile *ptr;
 293         struct tomoyo_profile *entry;
 294         if (profile >= TOMOYO_MAX_PROFILES)
 295                 return NULL;
 296         ptr = tomoyo_profile_ptr[profile];
 297         if (ptr)
 298                 return ptr;
 299         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 300         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 301                 goto out;
 302         ptr = tomoyo_profile_ptr[profile];
 303         if (!ptr && tomoyo_memory_ok(entry)) {
 304                 ptr = entry;
 305                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 306                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 307                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 308                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 309                        sizeof(ptr->config));
 310                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
 311                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
 312                 mb(); /* Avoid out-of-order execution. */
 313                 tomoyo_profile_ptr[profile] = ptr;
 314                 entry = NULL;
 315         }
 316         mutex_unlock(&tomoyo_policy_lock);
 317  out:
 318         kfree(entry);
 319         return ptr;
 320 }
 321
 322 /**
 323  * tomoyo_profile - Find a profile.
 324  *
 325  * @profile: Profile number to find.
 326  *
 327  * Returns pointer to "struct tomoyo_profile".
 328  */
 329 struct tomoyo_profile *tomoyo_profile(const u8 profile)
 330 {
 331         static struct tomoyo_profile tomoyo_null_profile;
 332         struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
 333         if (!ptr)
 334                 ptr = &tomoyo_null_profile;
 335         return ptr;
 336 }
 337
 338 /**
 339  * tomoyo_find_yesno - Find values for specified keyword.
 340  *
 341  * @string: String to check.
 342  * @find:   Name of keyword.
 343  *
 344  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 345  */
 346 static s8 tomoyo_find_yesno(const char *string, const char *find)
 347 {
 348         const char *cp = strstr(string, find);
 349         if (cp) {
 350                 cp += strlen(find);
 351                 if (!strncmp(cp, "=yes", 4))
 352                         return 1;
 353                 else if (!strncmp(cp, "=no", 3))
 354                         return 0;
 355         }
 356         return -1;
 357 }
 358
 359 /**
 360  * tomoyo_set_uint - Set value for specified preference.
 361  *
 362  * @i:      Pointer to "unsigned int".
 363  * @string: String to check.
 364  * @find:   Name of keyword.
 365  *
 366  * Returns nothing.
 367  */
 368 static void tomoyo_set_uint(unsigned int *i, const char *string,
 369                             const char *find)
 370 {
 371         const char *cp = strstr(string, find);
 372         if (cp)
 373                 sscanf(cp + strlen(find), "=%u", i);
 374 }
 375
 376 /**
 377  * tomoyo_set_mode - Set mode for specified profile.
 378  *
 379  * @name:    Name of functionality.
 380  * @value:   Mode for @name.
 381  * @profile: Pointer to "struct tomoyo_profile".
 382  *
 383  * Returns 0 on success, negative value otherwise.
 384  */
 385 static int tomoyo_set_mode(char *name, const char *value,
 386                            struct tomoyo_profile *profile)
 387 {
 388         u8 i;
 389         u8 config;
 390         if (!strcmp(name, "CONFIG")) {
 391                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 392                 config = profile->default_config;
 393         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 394                 config = 0;
 395                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 396                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 397                         if (strcmp(name, tomoyo_mac_keywords[i]))
 398                                 continue;
 399                         config = profile->config[i];
 400                         break;
 401                 }
 402                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 403                         return -EINVAL;
 404         } else {
 405                 return -EINVAL;
 406         }
 407         if (strstr(value, "use_default")) {
 408                 config = TOMOYO_CONFIG_USE_DEFAULT;
 409         } else {
 410                 u8 mode;
 411                 for (mode = 0; mode < 4; mode++)
 412                         if (strstr(value, tomoyo_mode[mode]))
 413                                 /*
 414                                  * Update lower 3 bits in order to distinguish
 415                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 416                                  */
 417                                 config = (config & ~7) | mode;
 418                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 419                         switch (tomoyo_find_yesno(value, "grant_log")) {
 420                         case 1:
 421                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 422                                 break;
 423                         case 0:
 424                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 425                                 break;
 426                         }
 427                         switch (tomoyo_find_yesno(value, "reject_log")) {
 428                         case 1:
 429                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 430                                 break;
 431                         case 0:
 432                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 433                                 break;
 434                         }
 435                 }
 436         }
 437         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 438                 profile->config[i] = config;
 439         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 440                 profile->default_config = config;
 441         return 0;
 442 }
 443
 444 /**
 445  * tomoyo_write_profile - Write profile table.
 446  *
 447  * @head: Pointer to "struct tomoyo_io_buffer".
 448  *
 449  * Returns 0 on success, negative value otherwise.
 450  */
 451 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 452 {
 453         char *data = head->write_buf;
 454         unsigned int i;
 455         char *cp;
 456         struct tomoyo_profile *profile;
 457         if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
 458                 return 0;
 459         i = simple_strtoul(data, &cp, 10);
 460         if (*cp != '-')
 461                 return -EINVAL;
 462         data = cp + 1;
 463         profile = tomoyo_assign_profile(i);
 464         if (!profile)
 465                 return -EINVAL;
 466         cp = strchr(data, '=');
 467         if (!cp)
 468                 return -EINVAL;
 469         *cp++ = '\0';
 470         if (!strcmp(data, "COMMENT")) {
 471                 static DEFINE_SPINLOCK(lock);
 472                 const struct tomoyo_path_info *new_comment
 473                         = tomoyo_get_name(cp);
 474                 const struct tomoyo_path_info *old_comment;
 475                 if (!new_comment)
 476                         return -ENOMEM;
 477                 spin_lock(&lock);
 478                 old_comment = profile->comment;
 479                 profile->comment = new_comment;
 480                 spin_unlock(&lock);
 481                 tomoyo_put_name(old_comment);
 482                 return 0;
 483         }
 484         if (!strcmp(data, "PREFERENCE")) {
 485                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 486                         tomoyo_set_uint(&profile->pref[i], cp,
 487                                         tomoyo_pref_keywords[i]);
 488                 return 0;
 489         }
 490         return tomoyo_set_mode(data, cp, profile);
 491 }
 492
 493 /**
 494  * tomoyo_print_config - Print mode for specified functionality.
 495  *
 496  * @head:   Pointer to "struct tomoyo_io_buffer".
 497  * @config: Mode for that functionality.
 498  *
 499  * Returns nothing.
 500  *
 501  * Caller prints functionality's name.
 502  */
 503 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 504 {
 505         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 506                          tomoyo_mode[config & 3],
 507                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 508                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 509 }
 510
 511 /**
 512  * tomoyo_read_profile - Read profile table.
 513  *
 514  * @head: Pointer to "struct tomoyo_io_buffer".
 515  *
 516  * Returns nothing.
 517  */
 518 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 519 {
 520         u8 index;
 521         const struct tomoyo_profile *profile;
 522  next:
 523         index = head->r.index;
 524         profile = tomoyo_profile_ptr[index];
 525         switch (head->r.step) {
 526         case 0:
 527                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n", 20090903);
 528                 head->r.step++;
 529                 break;
 530         case 1:
 531                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 532                       head->r.index++)
 533                         if (tomoyo_profile_ptr[head->r.index])
 534                                 break;
 535                 if (head->r.index == TOMOYO_MAX_PROFILES)
 536                         return;
 537                 head->r.step++;
 538                 break;
 539         case 2:
 540                 {
 541                         u8 i;
 542                         const struct tomoyo_path_info *comment =
 543                                 profile->comment;
 544                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 545                         tomoyo_set_string(head, comment ? comment->name : "");
 546                         tomoyo_set_lf(head);
 547                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 548                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 549                                 tomoyo_io_printf(head, "%s=%u ",
 550                                                  tomoyo_pref_keywords[i],
 551                                                  profile->pref[i]);
 552                         tomoyo_set_string(head, "}\n");
 553                         head->r.step++;
 554                 }
 555                 break;
 556         case 3:
 557                 {
 558                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 559                         tomoyo_print_config(head, profile->default_config);
 560                         head->r.bit = 0;
 561                         head->r.step++;
 562                 }
 563                 break;
 564         case 4:
 565                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 566                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 567                         const u8 i = head->r.bit;
 568                         const u8 config = profile->config[i];
 569                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 570                                 continue;
 571                         tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::",
 572                                          tomoyo_mac_keywords[i]);
 573                         tomoyo_print_config(head, config);
 574                         head->r.bit++;
 575                         break;
 576                 }
 577                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 578                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 579                         head->r.index++;
 580                         head->r.step = 1;
 581                 }
 582                 break;
 583         }
 584         if (tomoyo_flush(head))
 585                 goto next;
 586 }
 587
 588 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 589                                 const struct tomoyo_acl_head *b)
 590 {
 591         return container_of(a, struct tomoyo_manager, head)->manager ==
 592                 container_of(b, struct tomoyo_manager, head)->manager;
 593 }
 594
 595 /**
 596  * tomoyo_update_manager_entry - Add a manager entry.
 597  *
 598  * @manager:   The path to manager or the domainnamme.
 599  * @is_delete: True if it is a delete request.
 600  *
 601  * Returns 0 on success, negative value otherwise.
 602  *
 603  * Caller holds tomoyo_read_lock().
 604  */
 605 static int tomoyo_update_manager_entry(const char *manager,
 606                                        const bool is_delete)
 607 {
 608         struct tomoyo_manager e = { };
 609         struct tomoyo_acl_param param = {
 610                 .is_delete = is_delete,
 611                 .list = &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 612         };
 613         int error = is_delete ? -ENOENT : -ENOMEM;
 614         if (tomoyo_domain_def(manager)) {
 615                 if (!tomoyo_correct_domain(manager))
 616                         return -EINVAL;
 617                 e.is_domain = true;
 618         } else {
 619                 if (!tomoyo_correct_path(manager))
 620                         return -EINVAL;
 621         }
 622         e.manager = tomoyo_get_name(manager);
 623         if (e.manager) {
 624                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 625                                              tomoyo_same_manager);
 626                 tomoyo_put_name(e.manager);
 627         }
 628         return error;
 629 }
 630
 631 /**
 632  * tomoyo_write_manager - Write manager policy.
 633  *
 634  * @head: Pointer to "struct tomoyo_io_buffer".
 635  *
 636  * Returns 0 on success, negative value otherwise.
 637  *
 638  * Caller holds tomoyo_read_lock().
 639  */
 640 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 641 {
 642         char *data = head->write_buf;
 643         bool is_delete = tomoyo_str_starts(&data, "delete ");
 644
 645         if (!strcmp(data, "manage_by_non_root")) {
 646                 tomoyo_manage_by_non_root = !is_delete;
 647                 return 0;
 648         }
 649         return tomoyo_update_manager_entry(data, is_delete);
 650 }
 651
 652 /**
 653  * tomoyo_read_manager - Read manager policy.
 654  *
 655  * @head: Pointer to "struct tomoyo_io_buffer".
 656  *
 657  * Caller holds tomoyo_read_lock().
 658  */
 659 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 660 {
 661         if (head->r.eof)
 662                 return;
 663         list_for_each_cookie(head->r.acl,
 664                              &tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
 665                 struct tomoyo_manager *ptr =
 666                         list_entry(head->r.acl, typeof(*ptr), head.list);
 667                 if (ptr->head.is_deleted)
 668                         continue;
 669                 if (!tomoyo_flush(head))
 670                         return;
 671                 tomoyo_set_string(head, ptr->manager->name);
 672                 tomoyo_set_lf(head);
 673         }
 674         head->r.eof = true;
 675 }
 676
 677 /**
 678  * tomoyo_manager - Check whether the current process is a policy manager.
 679  *
 680  * Returns true if the current process is permitted to modify policy
 681  * via /sys/kernel/security/tomoyo/ interface.
 682  *
 683  * Caller holds tomoyo_read_lock().
 684  */
 685 static bool tomoyo_manager(void)
 686 {
 687         struct tomoyo_manager *ptr;
 688         const char *exe;
 689         const struct task_struct *task = current;
 690         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 691         bool found = false;
 692
 693         if (!tomoyo_policy_loaded)
 694                 return true;
 695         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 696                 return false;
 697         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 698                                 head.list) {
 699                 if (!ptr->head.is_deleted && ptr->is_domain
 700                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 701                         found = true;
 702                         break;
 703                 }
 704         }
 705         if (found)
 706                 return true;
 707         exe = tomoyo_get_exe();
 708         if (!exe)
 709                 return false;
 710         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 711                                 head.list) {
 712                 if (!ptr->head.is_deleted && !ptr->is_domain
 713                     && !strcmp(exe, ptr->manager->name)) {
 714                         found = true;
 715                         break;
 716                 }
 717         }
 718         if (!found) { /* Reduce error messages. */
 719                 static pid_t last_pid;
 720                 const pid_t pid = current->pid;
 721                 if (last_pid != pid) {
 722                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 723                                "update policies.\n", domainname->name, exe);
 724                         last_pid = pid;
 725                 }
 726         }
 727         kfree(exe);
 728         return found;
 729 }
 730
 731 /**
 732  * tomoyo_select_one - Parse select command.
 733  *
 734  * @head: Pointer to "struct tomoyo_io_buffer".
 735  * @data: String to parse.
 736  *
 737  * Returns true on success, false otherwise.
 738  *
 739  * Caller holds tomoyo_read_lock().
 740  */
 741 static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
 742 {
 743         unsigned int pid;
 744         struct tomoyo_domain_info *domain = NULL;
 745         bool global_pid = false;
 746
 747         if (!strcmp(data, "allow_execute")) {
 748                 head->r.print_execute_only = true;
 749                 return true;
 750         }
 751         if (sscanf(data, "pid=%u", &pid) == 1 ||
 752             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 753                 struct task_struct *p;
 754                 rcu_read_lock();
 755                 read_lock(&tasklist_lock);
 756                 if (global_pid)
 757                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 758                 else
 759                         p = find_task_by_vpid(pid);
 760                 if (p)
 761                         domain = tomoyo_real_domain(p);
 762                 read_unlock(&tasklist_lock);
 763                 rcu_read_unlock();
 764         } else if (!strncmp(data, "domain=", 7)) {
 765                 if (tomoyo_domain_def(data + 7))
 766                         domain = tomoyo_find_domain(data + 7);
 767         } else
 768                 return false;
 769         head->w.domain = domain;
 770         /* Accessing read_buf is safe because head->io_sem is held. */
 771         if (!head->read_buf)
 772                 return true; /* Do nothing if open(O_WRONLY). */
 773         memset(&head->r, 0, sizeof(head->r));
 774         head->r.print_this_domain_only = true;
 775         if (domain)
 776                 head->r.domain = &domain->list;
 777         else
 778                 head->r.eof = 1;
 779         tomoyo_io_printf(head, "# select %s\n", data);
 780         if (domain && domain->is_deleted)
 781                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 782         return true;
 783 }
 784
 785 /**
 786  * tomoyo_delete_domain - Delete a domain.
 787  *
 788  * @domainname: The name of domain.
 789  *
 790  * Returns 0.
 791  *
 792  * Caller holds tomoyo_read_lock().
 793  */
 794 static int tomoyo_delete_domain(char *domainname)
 795 {
 796         struct tomoyo_domain_info *domain;
 797         struct tomoyo_path_info name;
 798
 799         name.name = domainname;
 800         tomoyo_fill_path_info(&name);
 801         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 802                 return 0;
 803         /* Is there an active domain? */
 804         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 805                 /* Never delete tomoyo_kernel_domain */
 806                 if (domain == &tomoyo_kernel_domain)
 807                         continue;
 808                 if (domain->is_deleted ||
 809                     tomoyo_pathcmp(domain->domainname, &name))
 810                         continue;
 811                 domain->is_deleted = true;
 812                 break;
 813         }
 814         mutex_unlock(&tomoyo_policy_lock);
 815         return 0;
 816 }
 817
 818 /**
 819  * tomoyo_write_domain2 - Write domain policy.
 820  *
 821  * @list:      Pointer to "struct list_head".
 822  * @data:      Policy to be interpreted.
 823  * @is_delete: True if it is a delete request.
 824  *
 825  * Returns 0 on success, negative value otherwise.
 826  *
 827  * Caller holds tomoyo_read_lock().
 828  */
 829 static int tomoyo_write_domain2(struct list_head *list, char *data,
 830                                 const bool is_delete)
 831 {
 832         struct tomoyo_acl_param param = {
 833                 .list = list,
 834                 .data = data,
 835                 .is_delete = is_delete,
 836         };
 837         static const struct {
 838                 const char *keyword;
 839                 int (*write) (struct tomoyo_acl_param *);
 840         } tomoyo_callback[1] = {
 841                 { "file ", tomoyo_write_file },
 842         };
 843         u8 i;
 844         for (i = 0; i < 1; i++) {
 845                 if (!tomoyo_str_starts(&param.data,
 846                                        tomoyo_callback[i].keyword))
 847                         continue;
 848                 return tomoyo_callback[i].write(&param);
 849         }
 850         return -EINVAL;
 851 }
 852
 853 /**
 854  * tomoyo_write_domain - Write domain policy.
 855  *
 856  * @head: Pointer to "struct tomoyo_io_buffer".
 857  *
 858  * Returns 0 on success, negative value otherwise.
 859  *
 860  * Caller holds tomoyo_read_lock().
 861  */
 862 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
 863 {
 864         char *data = head->write_buf;
 865         struct tomoyo_domain_info *domain = head->w.domain;
 866         bool is_delete = false;
 867         bool is_select = false;
 868         unsigned int profile;
 869
 870         if (tomoyo_str_starts(&data, "delete "))
 871                 is_delete = true;
 872         else if (tomoyo_str_starts(&data, "select "))
 873                 is_select = true;
 874         if (is_select && tomoyo_select_one(head, data))
 875                 return 0;
 876         /* Don't allow updating policies by non manager programs. */
 877         if (!tomoyo_manager())
 878                 return -EPERM;
 879         if (tomoyo_domain_def(data)) {
 880                 domain = NULL;
 881                 if (is_delete)
 882                         tomoyo_delete_domain(data);
 883                 else if (is_select)
 884                         domain = tomoyo_find_domain(data);
 885                 else
 886                         domain = tomoyo_assign_domain(data, 0);
 887                 head->w.domain = domain;
 888                 return 0;
 889         }
 890         if (!domain)
 891                 return -EINVAL;
 892
 893         if (sscanf(data, "use_profile %u", &profile) == 1
 894             && profile < TOMOYO_MAX_PROFILES) {
 895                 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
 896                         domain->profile = (u8) profile;
 897                 return 0;
 898         }
 899         if (sscanf(data, "use_group %u\n", &profile) == 1
 900             && profile < TOMOYO_MAX_ACL_GROUPS) {
 901                 if (!is_delete)
 902                         domain->group = (u8) profile;
 903                 return 0;
 904         }
 905         if (!strcmp(data, "quota_exceeded")) {
 906                 domain->quota_warned = !is_delete;
 907                 return 0;
 908         }
 909         if (!strcmp(data, "transition_failed")) {
 910                 domain->transition_failed = !is_delete;
 911                 return 0;
 912         }
 913         return tomoyo_write_domain2(&domain->acl_info_list, data, is_delete);
 914 }
 915
 916 /**
 917  * tomoyo_set_group - Print "acl_group " header keyword and category name.
 918  *
 919  * @head:     Pointer to "struct tomoyo_io_buffer".
 920  * @category: Category name.
 921  *
 922  * Returns nothing.
 923  */
 924 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
 925                              const char *category)
 926 {
 927         if (head->type == TOMOYO_EXCEPTIONPOLICY)
 928                 tomoyo_io_printf(head, "acl_group %u ",
 929                                  head->r.acl_group_index);
 930         tomoyo_set_string(head, category);
 931 }
 932
 933 /**
 934  * tomoyo_print_entry - Print an ACL entry.
 935  *
 936  * @head: Pointer to "struct tomoyo_io_buffer".
 937  * @acl:  Pointer to an ACL entry.
 938  *
 939  * Returns true on success, false otherwise.
 940  */
 941 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
 942                                struct tomoyo_acl_info *acl)
 943 {
 944         const u8 acl_type = acl->type;
 945         bool first = true;
 946         u8 bit;
 947
 948         if (acl->is_deleted)
 949                 return true;
 950         if (!tomoyo_flush(head))
 951                 return false;
 952         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
 953                 struct tomoyo_path_acl *ptr =
 954                         container_of(acl, typeof(*ptr), head);
 955                 const u16 perm = ptr->perm;
 956                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
 957                         if (!(perm & (1 << bit)))
 958                                 continue;
 959                         if (head->r.print_execute_only &&
 960                             bit != TOMOYO_TYPE_EXECUTE)
 961                                 continue;
 962                         if (first) {
 963                                 tomoyo_set_group(head, "file ");
 964                                 first = false;
 965                         } else {
 966                                 tomoyo_set_slash(head);
 967                         }
 968                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
 969                 }
 970                 if (first)
 971                         return true;
 972                 tomoyo_print_name_union(head, &ptr->name);
 973         } else if (head->r.print_execute_only) {
 974                 return true;
 975         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
 976                 struct tomoyo_path2_acl *ptr =
 977                         container_of(acl, typeof(*ptr), head);
 978                 const u8 perm = ptr->perm;
 979                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
 980                         if (!(perm & (1 << bit)))
 981                                 continue;
 982                         if (first) {
 983                                 tomoyo_set_group(head, "file ");
 984                                 first = false;
 985                         } else {
 986                                 tomoyo_set_slash(head);
 987                         }
 988                         tomoyo_set_string(head, tomoyo_mac_keywords
 989                                           [tomoyo_pp2mac[bit]]);
 990                 }
 991                 if (first)
 992                         return true;
 993                 tomoyo_print_name_union(head, &ptr->name1);
 994                 tomoyo_print_name_union(head, &ptr->name2);
 995         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
 996                 struct tomoyo_path_number_acl *ptr =
 997                         container_of(acl, typeof(*ptr), head);
 998                 const u8 perm = ptr->perm;
 999                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1000                         if (!(perm & (1 << bit)))
1001                                 continue;
1002                         if (first) {
1003                                 tomoyo_set_group(head, "file ");
1004                                 first = false;
1005                         } else {
1006                                 tomoyo_set_slash(head);
1007                         }
1008                         tomoyo_set_string(head, tomoyo_mac_keywords
1009                                           [tomoyo_pn2mac[bit]]);
1010                 }
1011                 if (first)
1012                         return true;
1013                 tomoyo_print_name_union(head, &ptr->name);
1014                 tomoyo_print_number_union(head, &ptr->number);
1015         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1016                 struct tomoyo_mkdev_acl *ptr =
1017                         container_of(acl, typeof(*ptr), head);
1018                 const u8 perm = ptr->perm;
1019                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1020                         if (!(perm & (1 << bit)))
1021                                 continue;
1022                         if (first) {
1023                                 tomoyo_set_group(head, "file ");
1024                                 first = false;
1025                         } else {
1026                                 tomoyo_set_slash(head);
1027                         }
1028                         tomoyo_set_string(head, tomoyo_mac_keywords
1029                                           [tomoyo_pnnn2mac[bit]]);
1030                 }
1031                 if (first)
1032                         return true;
1033                 tomoyo_print_name_union(head, &ptr->name);
1034                 tomoyo_print_number_union(head, &ptr->mode);
1035                 tomoyo_print_number_union(head, &ptr->major);
1036                 tomoyo_print_number_union(head, &ptr->minor);
1037         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1038                 struct tomoyo_mount_acl *ptr =
1039                         container_of(acl, typeof(*ptr), head);
1040                 tomoyo_set_group(head, "file mount");
1041                 tomoyo_print_name_union(head, &ptr->dev_name);
1042                 tomoyo_print_name_union(head, &ptr->dir_name);
1043                 tomoyo_print_name_union(head, &ptr->fs_type);
1044                 tomoyo_print_number_union(head, &ptr->flags);
1045         }
1046         tomoyo_set_lf(head);
1047         return true;
1048 }
1049
1050 /**
1051  * tomoyo_read_domain2 - Read domain policy.
1052  *
1053  * @head: Pointer to "struct tomoyo_io_buffer".
1054  * @list: Pointer to "struct list_head".
1055  *
1056  * Caller holds tomoyo_read_lock().
1057  *
1058  * Returns true on success, false otherwise.
1059  */
1060 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1061                                 struct list_head *list)
1062 {
1063         list_for_each_cookie(head->r.acl, list) {
1064                 struct tomoyo_acl_info *ptr =
1065                         list_entry(head->r.acl, typeof(*ptr), list);
1066                 if (!tomoyo_print_entry(head, ptr))
1067                         return false;
1068         }
1069         head->r.acl = NULL;
1070         return true;
1071 }
1072
1073 /**
1074  * tomoyo_read_domain - Read domain policy.
1075  *
1076  * @head: Pointer to "struct tomoyo_io_buffer".
1077  *
1078  * Caller holds tomoyo_read_lock().
1079  */
1080 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1081 {
1082         if (head->r.eof)
1083                 return;
1084         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1085                 struct tomoyo_domain_info *domain =
1086                         list_entry(head->r.domain, typeof(*domain), list);
1087                 switch (head->r.step) {
1088                 case 0:
1089                         if (domain->is_deleted &&
1090                             !head->r.print_this_domain_only)
1091                                 continue;
1092                         /* Print domainname and flags. */
1093                         tomoyo_set_string(head, domain->domainname->name);
1094                         tomoyo_set_lf(head);
1095                         tomoyo_io_printf(head, "use_profile %u\n",
1096                                          domain->profile);
1097                         tomoyo_io_printf(head, "use_group %u\n",
1098                                          domain->group);
1099                         if (domain->quota_warned)
1100                                 tomoyo_set_string(head, "quota_exceeded\n");
1101                         if (domain->transition_failed)
1102                                 tomoyo_set_string(head, "transition_failed\n");
1103                         head->r.step++;
1104                         tomoyo_set_lf(head);
1105                         /* fall through */
1106                 case 1:
1107                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1108                                 return;
1109                         head->r.step++;
1110                         if (!tomoyo_set_lf(head))
1111                                 return;
1112                         /* fall through */
1113                 case 2:
1114                         head->r.step = 0;
1115                         if (head->r.print_this_domain_only)
1116                                 goto done;
1117                 }
1118         }
1119  done:
1120         head->r.eof = true;
1121 }
1122
1123 /**
1124  * tomoyo_write_domain_profile - Assign profile for specified domain.
1125  *
1126  * @head: Pointer to "struct tomoyo_io_buffer".
1127  *
1128  * Returns 0 on success, -EINVAL otherwise.
1129  *
1130  * This is equivalent to doing
1131  *
1132  *     ( echo "select " $domainname; echo "use_profile " $profile ) |
1133  *     /usr/sbin/tomoyo-loadpolicy -d
1134  *
1135  * Caller holds tomoyo_read_lock().
1136  */
1137 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1138 {
1139         char *data = head->write_buf;
1140         char *cp = strchr(data, ' ');
1141         struct tomoyo_domain_info *domain;
1142         unsigned long profile;
1143
1144         if (!cp)
1145                 return -EINVAL;
1146         *cp = '\0';
1147         domain = tomoyo_find_domain(cp + 1);
1148         if (strict_strtoul(data, 10, &profile))
1149                 return -EINVAL;
1150         if (domain && profile < TOMOYO_MAX_PROFILES
1151             && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1152                 domain->profile = (u8) profile;
1153         return 0;
1154 }
1155
1156 /**
1157  * tomoyo_read_domain_profile - Read only domainname and profile.
1158  *
1159  * @head: Pointer to "struct tomoyo_io_buffer".
1160  *
1161  * Returns list of profile number and domainname pairs.
1162  *
1163  * This is equivalent to doing
1164  *
1165  *     grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1166  *     awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1167  *     domainname = $0; } else if ( $1 == "use_profile" ) {
1168  *     print $2 " " domainname; domainname = ""; } } ; '
1169  *
1170  * Caller holds tomoyo_read_lock().
1171  */
1172 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1173 {
1174         if (head->r.eof)
1175                 return;
1176         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1177                 struct tomoyo_domain_info *domain =
1178                         list_entry(head->r.domain, typeof(*domain), list);
1179                 if (domain->is_deleted)
1180                         continue;
1181                 if (!tomoyo_flush(head))
1182                         return;
1183                 tomoyo_io_printf(head, "%u ", domain->profile);
1184                 tomoyo_set_string(head, domain->domainname->name);
1185                 tomoyo_set_lf(head);
1186         }
1187         head->r.eof = true;
1188 }
1189
1190 /**
1191  * tomoyo_write_pid: Specify PID to obtain domainname.
1192  *
1193  * @head: Pointer to "struct tomoyo_io_buffer".
1194  *
1195  * Returns 0.
1196  */
1197 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1198 {
1199         head->r.eof = false;
1200         return 0;
1201 }
1202
1203 /**
1204  * tomoyo_read_pid - Get domainname of the specified PID.
1205  *
1206  * @head: Pointer to "struct tomoyo_io_buffer".
1207  *
1208  * Returns the domainname which the specified PID is in on success,
1209  * empty string otherwise.
1210  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1211  * using read()/write() interface rather than sysctl() interface.
1212  */
1213 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1214 {
1215         char *buf = head->write_buf;
1216         bool global_pid = false;
1217         unsigned int pid;
1218         struct task_struct *p;
1219         struct tomoyo_domain_info *domain = NULL;
1220
1221         /* Accessing write_buf is safe because head->io_sem is held. */
1222         if (!buf) {
1223                 head->r.eof = true;
1224                 return; /* Do nothing if open(O_RDONLY). */
1225         }
1226         if (head->r.w_pos || head->r.eof)
1227                 return;
1228         head->r.eof = true;
1229         if (tomoyo_str_starts(&buf, "global-pid "))
1230                 global_pid = true;
1231         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1232         rcu_read_lock();
1233         read_lock(&tasklist_lock);
1234         if (global_pid)
1235                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1236         else
1237                 p = find_task_by_vpid(pid);
1238         if (p)
1239                 domain = tomoyo_real_domain(p);
1240         read_unlock(&tasklist_lock);
1241         rcu_read_unlock();
1242         if (!domain)
1243                 return;
1244         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1245         tomoyo_set_string(head, domain->domainname->name);
1246 }
1247
1248 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1249         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain",
1250         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain",
1251         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain",
1252         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain",
1253 };
1254
1255 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1256         [TOMOYO_PATH_GROUP]   = "path_group ",
1257         [TOMOYO_NUMBER_GROUP] = "number_group ",
1258 };
1259
1260 /**
1261  * tomoyo_write_exception - Write exception policy.
1262  *
1263  * @head: Pointer to "struct tomoyo_io_buffer".
1264  *
1265  * Returns 0 on success, negative value otherwise.
1266  *
1267  * Caller holds tomoyo_read_lock().
1268  */
1269 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1270 {
1271         struct tomoyo_acl_param param = {
1272                 .data = head->write_buf,
1273         };
1274         u8 i;
1275         param.is_delete = tomoyo_str_starts(&param.data, "delete ");
1276         if (!param.is_delete && tomoyo_str_starts(&param.data, "select ") &&
1277             !strcmp(param.data, "execute_only")) {
1278                 head->r.print_execute_only = true;
1279                 return 0;
1280         }
1281         /* Don't allow updating policies by non manager programs. */
1282         if (!tomoyo_manager())
1283                 return -EPERM;
1284         if (tomoyo_str_starts(&param.data, "aggregator "))
1285                 return tomoyo_write_aggregator(&param);
1286         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1287                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1288                         return tomoyo_write_transition_control(&param, i);
1289         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1290                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1291                         return tomoyo_write_group(&param, i);
1292         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1293                 unsigned int group;
1294                 char *data;
1295                 group = simple_strtoul(param.data, &data, 10);
1296                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1297                         return tomoyo_write_domain2(&tomoyo_acl_group[group],
1298                                                     data, param.is_delete);
1299         }
1300         return -EINVAL;
1301 }
1302
1303 /**
1304  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1305  *
1306  * @head: Pointer to "struct tomoyo_io_buffer".
1307  * @idx:  Index number.
1308  *
1309  * Returns true on success, false otherwise.
1310  *
1311  * Caller holds tomoyo_read_lock().
1312  */
1313 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1314 {
1315         list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
1316                 struct tomoyo_group *group =
1317                         list_entry(head->r.group, typeof(*group), head.list);
1318                 list_for_each_cookie(head->r.acl, &group->member_list) {
1319                         struct tomoyo_acl_head *ptr =
1320                                 list_entry(head->r.acl, typeof(*ptr), list);
1321                         if (ptr->is_deleted)
1322                                 continue;
1323                         if (!tomoyo_flush(head))
1324                                 return false;
1325                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1326                         tomoyo_set_string(head, group->group_name->name);
1327                         if (idx == TOMOYO_PATH_GROUP) {
1328                                 tomoyo_set_space(head);
1329                                 tomoyo_set_string(head, container_of
1330                                                (ptr, struct tomoyo_path_group,
1331                                                 head)->member_name->name);
1332                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1333                                 tomoyo_print_number_union(head, &container_of
1334                                                           (ptr,
1335                                                    struct tomoyo_number_group,
1336                                                            head)->number);
1337                         }
1338                         tomoyo_set_lf(head);
1339                 }
1340                 head->r.acl = NULL;
1341         }
1342         head->r.group = NULL;
1343         return true;
1344 }
1345
1346 /**
1347  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1348  *
1349  * @head: Pointer to "struct tomoyo_io_buffer".
1350  * @idx:  Index number.
1351  *
1352  * Returns true on success, false otherwise.
1353  *
1354  * Caller holds tomoyo_read_lock().
1355  */
1356 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1357 {
1358         list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) {
1359                 struct tomoyo_acl_head *acl =
1360                         container_of(head->r.acl, typeof(*acl), list);
1361                 if (acl->is_deleted)
1362                         continue;
1363                 if (!tomoyo_flush(head))
1364                         return false;
1365                 switch (idx) {
1366                 case TOMOYO_ID_TRANSITION_CONTROL:
1367                         {
1368                                 struct tomoyo_transition_control *ptr =
1369                                         container_of(acl, typeof(*ptr), head);
1370                                 tomoyo_set_string(head, tomoyo_transition_type
1371                                                   [ptr->type]);
1372                                 tomoyo_set_string(head, ptr->program ?
1373                                                   ptr->program->name : "any");
1374                                 tomoyo_set_string(head, " from ");
1375                                 tomoyo_set_string(head, ptr->domainname ?
1376                                                   ptr->domainname->name :
1377                                                   "any");
1378                         }
1379                         break;
1380                 case TOMOYO_ID_AGGREGATOR:
1381                         {
1382                                 struct tomoyo_aggregator *ptr =
1383                                         container_of(acl, typeof(*ptr), head);
1384                                 tomoyo_set_string(head, "aggregator ");
1385                                 tomoyo_set_string(head,
1386                                                   ptr->original_name->name);
1387                                 tomoyo_set_space(head);
1388                                 tomoyo_set_string(head,
1389                                                ptr->aggregated_name->name);
1390                         }
1391                         break;
1392                 default:
1393                         continue;
1394                 }
1395                 tomoyo_set_lf(head);
1396         }
1397         head->r.acl = NULL;
1398         return true;
1399 }
1400
1401 /**
1402  * tomoyo_read_exception - Read exception policy.
1403  *
1404  * @head: Pointer to "struct tomoyo_io_buffer".
1405  *
1406  * Caller holds tomoyo_read_lock().
1407  */
1408 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1409 {
1410         if (head->r.eof)
1411                 return;
1412         while (head->r.step < TOMOYO_MAX_POLICY &&
1413                tomoyo_read_policy(head, head->r.step))
1414                 head->r.step++;
1415         if (head->r.step < TOMOYO_MAX_POLICY)
1416                 return;
1417         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1418                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1419                 head->r.step++;
1420         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1421                 return;
1422         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1423                + TOMOYO_MAX_ACL_GROUPS) {
1424                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1425                         - TOMOYO_MAX_GROUP;
1426                 if (!tomoyo_read_domain2(head, &tomoyo_acl_group
1427                                          [head->r.acl_group_index]))
1428                         return;
1429                 head->r.step++;
1430         }
1431         head->r.eof = true;
1432 }
1433
1434 /* Wait queue for kernel -> userspace notification. */
1435 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1436 /* Wait queue for userspace -> kernel notification. */
1437 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1438
1439 /* Structure for query. */
1440 struct tomoyo_query {
1441         struct list_head list;
1442         char *query;
1443         size_t query_len;
1444         unsigned int serial;
1445         u8 timer;
1446         u8 answer;
1447         u8 retry;
1448 };
1449
1450 /* The list for "struct tomoyo_query". */
1451 static LIST_HEAD(tomoyo_query_list);
1452
1453 /* Lock for manipulating tomoyo_query_list. */
1454 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1455
1456 /*
1457  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1458  * interface.
1459  */
1460 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1461
1462 /**
1463  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1464  *
1465  * @domain: Pointer to "struct tomoyo_domain_info".
1466  * @header: Lines containing ACL.
1467  *
1468  * Returns nothing.
1469  */
1470 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1471 {
1472         char *buffer;
1473         char *cp = strchr(header, '\n');
1474         int len;
1475         if (!cp)
1476                 return;
1477         cp = strchr(cp + 1, '\n');
1478         if (!cp)
1479                 return;
1480         *cp++ = '\0';
1481         len = strlen(cp) + 1;
1482         buffer = kmalloc(len, GFP_NOFS);
1483         if (!buffer)
1484                 return;
1485         snprintf(buffer, len - 1, "%s", cp);
1486         tomoyo_normalize_line(buffer);
1487         tomoyo_write_domain2(&domain->acl_info_list, buffer, false);
1488         kfree(buffer);
1489 }
1490
1491 /**
1492  * tomoyo_supervisor - Ask for the supervisor's decision.
1493  *
1494  * @r:   Pointer to "struct tomoyo_request_info".
1495  * @fmt: The printf()'s format string, followed by parameters.
1496  *
1497  * Returns 0 if the supervisor decided to permit the access request which
1498  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1499  * supervisor decided to retry the access request which violated the policy in
1500  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1501  */
1502 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1503 {
1504         va_list args;
1505         int error;
1506         int len;
1507         static unsigned int tomoyo_serial;
1508         struct tomoyo_query entry = { };
1509         bool quota_exceeded = false;
1510         va_start(args, fmt);
1511         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
1512         va_end(args);
1513         /* Write /sys/kernel/security/tomoyo/audit. */
1514         va_start(args, fmt);
1515         tomoyo_write_log2(r, len, fmt, args);
1516         va_end(args);
1517         /* Nothing more to do if granted. */
1518         if (r->granted)
1519                 return 0;
1520         switch (r->mode) {
1521         case TOMOYO_CONFIG_ENFORCING:
1522                 error = -EPERM;
1523                 if (atomic_read(&tomoyo_query_observers))
1524                         break;
1525                 goto out;
1526         case TOMOYO_CONFIG_LEARNING:
1527                 error = 0;
1528                 /* Check max_learning_entry parameter. */
1529                 if (tomoyo_domain_quota_is_ok(r))
1530                         break;
1531                 /* fall through */
1532         default:
1533                 return 0;
1534         }
1535         /* Get message. */
1536         va_start(args, fmt);
1537         entry.query = tomoyo_init_log(r, len, fmt, args);
1538         va_end(args);
1539         if (!entry.query)
1540                 goto out;
1541         entry.query_len = strlen(entry.query) + 1;
1542         if (!error) {
1543                 tomoyo_add_entry(r->domain, entry.query);
1544                 goto out;
1545         }
1546         len = tomoyo_round2(entry.query_len);
1547         spin_lock(&tomoyo_query_list_lock);
1548         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
1549             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
1550             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
1551                 quota_exceeded = true;
1552         } else {
1553                 entry.serial = tomoyo_serial++;
1554                 entry.retry = r->retry;
1555                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
1556                 list_add_tail(&entry.list, &tomoyo_query_list);
1557         }
1558         spin_unlock(&tomoyo_query_list_lock);
1559         if (quota_exceeded)
1560                 goto out;
1561         /* Give 10 seconds for supervisor's opinion. */
1562         while (entry.timer < 10) {
1563                 wake_up_all(&tomoyo_query_wait);
1564                 if (wait_event_interruptible_timeout
1565                     (tomoyo_answer_wait, entry.answer ||
1566                      !atomic_read(&tomoyo_query_observers), HZ))
1567                         break;
1568                 else
1569                         entry.timer++;
1570         }
1571         spin_lock(&tomoyo_query_list_lock);
1572         list_del(&entry.list);
1573         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
1574         spin_unlock(&tomoyo_query_list_lock);
1575         switch (entry.answer) {
1576         case 3: /* Asked to retry by administrator. */
1577                 error = TOMOYO_RETRY_REQUEST;
1578                 r->retry++;
1579                 break;
1580         case 1:
1581                 /* Granted by administrator. */
1582                 error = 0;
1583                 break;
1584         default:
1585                 /* Timed out or rejected by administrator. */
1586                 break;
1587         }
1588 out:
1589         kfree(entry.query);
1590         return error;
1591 }
1592
1593 /**
1594  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1595  *
1596  * @file: Pointer to "struct file".
1597  * @wait: Pointer to "poll_table".
1598  *
1599  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1600  *
1601  * Waits for access requests which violated policy in enforcing mode.
1602  */
1603 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1604 {
1605         struct list_head *tmp;
1606         bool found = false;
1607         u8 i;
1608         for (i = 0; i < 2; i++) {
1609                 spin_lock(&tomoyo_query_list_lock);
1610                 list_for_each(tmp, &tomoyo_query_list) {
1611                         struct tomoyo_query *ptr =
1612                                 list_entry(tmp, typeof(*ptr), list);
1613                         if (ptr->answer)
1614                                 continue;
1615                         found = true;
1616                         break;
1617                 }
1618                 spin_unlock(&tomoyo_query_list_lock);
1619                 if (found)
1620                         return POLLIN | POLLRDNORM;
1621                 if (i)
1622                         break;
1623                 poll_wait(file, &tomoyo_query_wait, wait);
1624         }
1625         return 0;
1626 }
1627
1628 /**
1629  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1630  *
1631  * @head: Pointer to "struct tomoyo_io_buffer".
1632  */
1633 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1634 {
1635         struct list_head *tmp;
1636         int pos = 0;
1637         int len = 0;
1638         char *buf;
1639         if (head->r.w_pos)
1640                 return;
1641         if (head->read_buf) {
1642                 kfree(head->read_buf);
1643                 head->read_buf = NULL;
1644         }
1645         spin_lock(&tomoyo_query_list_lock);
1646         list_for_each(tmp, &tomoyo_query_list) {
1647                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1648                 if (ptr->answer)
1649                         continue;
1650                 if (pos++ != head->r.query_index)
1651                         continue;
1652                 len = ptr->query_len;
1653                 break;
1654         }
1655         spin_unlock(&tomoyo_query_list_lock);
1656         if (!len) {
1657                 head->r.query_index = 0;
1658                 return;
1659         }
1660         buf = kzalloc(len + 32, GFP_NOFS);
1661         if (!buf)
1662                 return;
1663         pos = 0;
1664         spin_lock(&tomoyo_query_list_lock);
1665         list_for_each(tmp, &tomoyo_query_list) {
1666                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1667                 if (ptr->answer)
1668                         continue;
1669                 if (pos++ != head->r.query_index)
1670                         continue;
1671                 /*
1672                  * Some query can be skipped because tomoyo_query_list
1673                  * can change, but I don't care.
1674                  */
1675                 if (len == ptr->query_len)
1676                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
1677                                  ptr->retry, ptr->query);
1678                 break;
1679         }
1680         spin_unlock(&tomoyo_query_list_lock);
1681         if (buf[0]) {
1682                 head->read_buf = buf;
1683                 head->r.w[head->r.w_pos++] = buf;
1684                 head->r.query_index++;
1685         } else {
1686                 kfree(buf);
1687         }
1688 }
1689
1690 /**
1691  * tomoyo_write_answer - Write the supervisor's decision.
1692  *
1693  * @head: Pointer to "struct tomoyo_io_buffer".
1694  *
1695  * Returns 0 on success, -EINVAL otherwise.
1696  */
1697 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1698 {
1699         char *data = head->write_buf;
1700         struct list_head *tmp;
1701         unsigned int serial;
1702         unsigned int answer;
1703         spin_lock(&tomoyo_query_list_lock);
1704         list_for_each(tmp, &tomoyo_query_list) {
1705                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1706                 ptr->timer = 0;
1707         }
1708         spin_unlock(&tomoyo_query_list_lock);
1709         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1710                 return -EINVAL;
1711         spin_lock(&tomoyo_query_list_lock);
1712         list_for_each(tmp, &tomoyo_query_list) {
1713                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1714                 if (ptr->serial != serial)
1715                         continue;
1716                 if (!ptr->answer)
1717                         ptr->answer = answer;
1718                 break;
1719         }
1720         spin_unlock(&tomoyo_query_list_lock);
1721         return 0;
1722 }
1723
1724 /**
1725  * tomoyo_read_version: Get version.
1726  *
1727  * @head: Pointer to "struct tomoyo_io_buffer".
1728  *
1729  * Returns version information.
1730  */
1731 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1732 {
1733         if (!head->r.eof) {
1734                 tomoyo_io_printf(head, "2.4.0");
1735                 head->r.eof = true;
1736         }
1737 }
1738
1739 /**
1740  * tomoyo_read_self_domain - Get the current process's domainname.
1741  *
1742  * @head: Pointer to "struct tomoyo_io_buffer".
1743  *
1744  * Returns the current process's domainname.
1745  */
1746 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1747 {
1748         if (!head->r.eof) {
1749                 /*
1750                  * tomoyo_domain()->domainname != NULL
1751                  * because every process belongs to a domain and
1752                  * the domain's name cannot be NULL.
1753                  */
1754                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1755                 head->r.eof = true;
1756         }
1757 }
1758
1759 /**
1760  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1761  *
1762  * @type: Type of interface.
1763  * @file: Pointer to "struct file".
1764  *
1765  * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1766  *
1767  * Caller acquires tomoyo_read_lock().
1768  */
1769 int tomoyo_open_control(const u8 type, struct file *file)
1770 {
1771         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1772
1773         if (!head)
1774                 return -ENOMEM;
1775         mutex_init(&head->io_sem);
1776         head->type = type;
1777         switch (type) {
1778         case TOMOYO_DOMAINPOLICY:
1779                 /* /sys/kernel/security/tomoyo/domain_policy */
1780                 head->write = tomoyo_write_domain;
1781                 head->read = tomoyo_read_domain;
1782                 break;
1783         case TOMOYO_EXCEPTIONPOLICY:
1784                 /* /sys/kernel/security/tomoyo/exception_policy */
1785                 head->write = tomoyo_write_exception;
1786                 head->read = tomoyo_read_exception;
1787                 break;
1788         case TOMOYO_AUDIT:
1789                 /* /sys/kernel/security/tomoyo/audit */
1790                 head->poll = tomoyo_poll_log;
1791                 head->read = tomoyo_read_log;
1792                 break;
1793         case TOMOYO_SELFDOMAIN:
1794                 /* /sys/kernel/security/tomoyo/self_domain */
1795                 head->read = tomoyo_read_self_domain;
1796                 break;
1797         case TOMOYO_DOMAIN_STATUS:
1798                 /* /sys/kernel/security/tomoyo/.domain_status */
1799                 head->write = tomoyo_write_domain_profile;
1800                 head->read = tomoyo_read_domain_profile;
1801                 break;
1802         case TOMOYO_PROCESS_STATUS:
1803                 /* /sys/kernel/security/tomoyo/.process_status */
1804                 head->write = tomoyo_write_pid;
1805                 head->read = tomoyo_read_pid;
1806                 break;
1807         case TOMOYO_VERSION:
1808                 /* /sys/kernel/security/tomoyo/version */
1809                 head->read = tomoyo_read_version;
1810                 head->readbuf_size = 128;
1811                 break;
1812         case TOMOYO_MEMINFO:
1813                 /* /sys/kernel/security/tomoyo/meminfo */
1814                 head->write = tomoyo_write_memory_quota;
1815                 head->read = tomoyo_read_memory_counter;
1816                 head->readbuf_size = 512;
1817                 break;
1818         case TOMOYO_PROFILE:
1819                 /* /sys/kernel/security/tomoyo/profile */
1820                 head->write = tomoyo_write_profile;
1821                 head->read = tomoyo_read_profile;
1822                 break;
1823         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1824                 head->poll = tomoyo_poll_query;
1825                 head->write = tomoyo_write_answer;
1826                 head->read = tomoyo_read_query;
1827                 break;
1828         case TOMOYO_MANAGER:
1829                 /* /sys/kernel/security/tomoyo/manager */
1830                 head->write = tomoyo_write_manager;
1831                 head->read = tomoyo_read_manager;
1832                 break;
1833         }
1834         if (!(file->f_mode & FMODE_READ)) {
1835                 /*
1836                  * No need to allocate read_buf since it is not opened
1837                  * for reading.
1838                  */
1839                 head->read = NULL;
1840                 head->poll = NULL;
1841         } else if (!head->poll) {
1842                 /* Don't allocate read_buf for poll() access. */
1843                 if (!head->readbuf_size)
1844                         head->readbuf_size = 4096 * 2;
1845                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1846                 if (!head->read_buf) {
1847                         kfree(head);
1848                         return -ENOMEM;
1849                 }
1850         }
1851         if (!(file->f_mode & FMODE_WRITE)) {
1852                 /*
1853                  * No need to allocate write_buf since it is not opened
1854                  * for writing.
1855                  */
1856                 head->write = NULL;
1857         } else if (head->write) {
1858                 head->writebuf_size = 4096 * 2;
1859                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1860                 if (!head->write_buf) {
1861                         kfree(head->read_buf);
1862                         kfree(head);
1863                         return -ENOMEM;
1864                 }
1865         }
1866         if (type != TOMOYO_QUERY && type != TOMOYO_AUDIT)
1867                 head->reader_idx = tomoyo_read_lock();
1868         file->private_data = head;
1869         /*
1870          * If the file is /sys/kernel/security/tomoyo/query , increment the
1871          * observer counter.
1872          * The obserber counter is used by tomoyo_supervisor() to see if
1873          * there is some process monitoring /sys/kernel/security/tomoyo/query.
1874          */
1875         if (type == TOMOYO_QUERY)
1876                 atomic_inc(&tomoyo_query_observers);
1877         return 0;
1878 }
1879
1880 /**
1881  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1882  *
1883  * @file: Pointer to "struct file".
1884  * @wait: Pointer to "poll_table".
1885  *
1886  * Waits for read readiness.
1887  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
1888  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
1889  */
1890 int tomoyo_poll_control(struct file *file, poll_table *wait)
1891 {
1892         struct tomoyo_io_buffer *head = file->private_data;
1893         if (!head->poll)
1894                 return -ENOSYS;
1895         return head->poll(file, wait);
1896 }
1897
1898 /**
1899  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1900  *
1901  * @head:       Pointer to "struct tomoyo_io_buffer".
1902  * @buffer:     Poiner to buffer to write to.
1903  * @buffer_len: Size of @buffer.
1904  *
1905  * Returns bytes read on success, negative value otherwise.
1906  *
1907  * Caller holds tomoyo_read_lock().
1908  */
1909 int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
1910                         const int buffer_len)
1911 {
1912         int len;
1913
1914         if (!head->read)
1915                 return -ENOSYS;
1916         if (mutex_lock_interruptible(&head->io_sem))
1917                 return -EINTR;
1918         head->read_user_buf = buffer;
1919         head->read_user_buf_avail = buffer_len;
1920         if (tomoyo_flush(head))
1921                 /* Call the policy handler. */
1922                 head->read(head);
1923         tomoyo_flush(head);
1924         len = head->read_user_buf - buffer;
1925         mutex_unlock(&head->io_sem);
1926         return len;
1927 }
1928
1929 /**
1930  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1931  *
1932  * @head:       Pointer to "struct tomoyo_io_buffer".
1933  * @buffer:     Pointer to buffer to read from.
1934  * @buffer_len: Size of @buffer.
1935  *
1936  * Returns @buffer_len on success, negative value otherwise.
1937  *
1938  * Caller holds tomoyo_read_lock().
1939  */
1940 int tomoyo_write_control(struct tomoyo_io_buffer *head,
1941                          const char __user *buffer, const int buffer_len)
1942 {
1943         int error = buffer_len;
1944         int avail_len = buffer_len;
1945         char *cp0 = head->write_buf;
1946
1947         if (!head->write)
1948                 return -ENOSYS;
1949         if (!access_ok(VERIFY_READ, buffer, buffer_len))
1950                 return -EFAULT;
1951         /* Don't allow updating policies by non manager programs. */
1952         if (head->write != tomoyo_write_pid &&
1953             head->write != tomoyo_write_domain &&
1954             head->write != tomoyo_write_exception && !tomoyo_manager())
1955                 return -EPERM;
1956         if (mutex_lock_interruptible(&head->io_sem))
1957                 return -EINTR;
1958         /* Read a line and dispatch it to the policy handler. */
1959         while (avail_len > 0) {
1960                 char c;
1961                 if (head->w.avail >= head->writebuf_size - 1) {
1962                         error = -ENOMEM;
1963                         break;
1964                 } else if (get_user(c, buffer)) {
1965                         error = -EFAULT;
1966                         break;
1967                 }
1968                 buffer++;
1969                 avail_len--;
1970                 cp0[head->w.avail++] = c;
1971                 if (c != '\n')
1972                         continue;
1973                 cp0[head->w.avail - 1] = '\0';
1974                 head->w.avail = 0;
1975                 tomoyo_normalize_line(cp0);
1976                 head->write(head);
1977         }
1978         mutex_unlock(&head->io_sem);
1979         return error;
1980 }
1981
1982 /**
1983  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1984  *
1985  * @head: Pointer to "struct tomoyo_io_buffer".
1986  *
1987  * Releases memory and returns 0.
1988  *
1989  * Caller looses tomoyo_read_lock().
1990  */
1991 int tomoyo_close_control(struct tomoyo_io_buffer *head)
1992 {
1993         const bool is_write = !!head->write_buf;
1994
1995         /*
1996          * If the file is /sys/kernel/security/tomoyo/query , decrement the
1997          * observer counter.
1998          */
1999         if (head->type == TOMOYO_QUERY)
2000                 atomic_dec(&tomoyo_query_observers);
2001         else if (head->type != TOMOYO_AUDIT)
2002                 tomoyo_read_unlock(head->reader_idx);
2003         /* Release memory used for policy I/O. */
2004         kfree(head->read_buf);
2005         head->read_buf = NULL;
2006         kfree(head->write_buf);
2007         head->write_buf = NULL;
2008         kfree(head);
2009         if (is_write)
2010                 tomoyo_run_gc();
2011         return 0;
2012 }
2013
2014 /**
2015  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2016  */
2017 void tomoyo_check_profile(void)
2018 {
2019         struct tomoyo_domain_info *domain;
2020         const int idx = tomoyo_read_lock();
2021         tomoyo_policy_loaded = true;
2022         /* Check all profiles currently assigned to domains are defined. */
2023         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2024                 const u8 profile = domain->profile;
2025                 if (tomoyo_profile_ptr[profile])
2026                         continue;
2027                 printk(KERN_ERR "You need to define profile %u before using it.\n",
2028                        profile);
2029                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2030                        "for more information.\n");
2031                 panic("Profile %u (used by '%s') not defined.\n",
2032                       profile, domain->domainname->name);
2033         }
2034         tomoyo_read_unlock(idx);
2035         if (tomoyo_profile_version != 20090903) {
2036                 printk(KERN_ERR "You need to install userland programs for "
2037                        "TOMOYO 2.3 and initialize policy configuration.\n");
2038                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2039                        "for more information.\n");
2040                 panic("Profile version %u is not supported.\n",
2041                       tomoyo_profile_version);
2042         }
2043         printk(KERN_INFO "TOMOYO: 2.3.0\n");
2044         printk(KERN_INFO "Mandatory Access Control activated.\n");
2045 }