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 static struct tomoyo_profile tomoyo_default_profile = {
  15         .learning = &tomoyo_default_profile.preference,
  16         .permissive = &tomoyo_default_profile.preference,
  17         .enforcing = &tomoyo_default_profile.preference,
  18         .preference.enforcing_verbose = true,
  19         .preference.learning_max_entry = 2048,
  20         .preference.learning_verbose = false,
  21         .preference.permissive_verbose = true
  22 };
  23
  24 /* Profile version. Currently only 20090903 is defined. */
  25 static unsigned int tomoyo_profile_version;
  26
  27 /* Profile table. Memory is allocated as needed. */
  28 static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
  29
  30 /* String table for functionality that takes 4 modes. */
  31 static const char *tomoyo_mode_4[4] = {
  32         "disabled", "learning", "permissive", "enforcing"
  33 };
  34
  35 /* String table for /sys/kernel/security/tomoyo/profile */
  36 static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
  37                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
  38         [TOMOYO_MAC_FILE_EXECUTE]    = "file::execute",
  39         [TOMOYO_MAC_FILE_OPEN]       = "file::open",
  40         [TOMOYO_MAC_FILE_CREATE]     = "file::create",
  41         [TOMOYO_MAC_FILE_UNLINK]     = "file::unlink",
  42         [TOMOYO_MAC_FILE_MKDIR]      = "file::mkdir",
  43         [TOMOYO_MAC_FILE_RMDIR]      = "file::rmdir",
  44         [TOMOYO_MAC_FILE_MKFIFO]     = "file::mkfifo",
  45         [TOMOYO_MAC_FILE_MKSOCK]     = "file::mksock",
  46         [TOMOYO_MAC_FILE_TRUNCATE]   = "file::truncate",
  47         [TOMOYO_MAC_FILE_SYMLINK]    = "file::symlink",
  48         [TOMOYO_MAC_FILE_REWRITE]    = "file::rewrite",
  49         [TOMOYO_MAC_FILE_MKBLOCK]    = "file::mkblock",
  50         [TOMOYO_MAC_FILE_MKCHAR]     = "file::mkchar",
  51         [TOMOYO_MAC_FILE_LINK]       = "file::link",
  52         [TOMOYO_MAC_FILE_RENAME]     = "file::rename",
  53         [TOMOYO_MAC_FILE_CHMOD]      = "file::chmod",
  54         [TOMOYO_MAC_FILE_CHOWN]      = "file::chown",
  55         [TOMOYO_MAC_FILE_CHGRP]      = "file::chgrp",
  56         [TOMOYO_MAC_FILE_IOCTL]      = "file::ioctl",
  57         [TOMOYO_MAC_FILE_CHROOT]     = "file::chroot",
  58         [TOMOYO_MAC_FILE_MOUNT]      = "file::mount",
  59         [TOMOYO_MAC_FILE_UMOUNT]     = "file::umount",
  60         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
  61         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  62 };
  63
  64 /* Permit policy management by non-root user? */
  65 static bool tomoyo_manage_by_non_root;
  66
  67 /* Utility functions. */
  68
  69 /**
  70  * tomoyo_yesno - Return "yes" or "no".
  71  *
  72  * @value: Bool value.
  73  */
  74 static const char *tomoyo_yesno(const unsigned int value)
  75 {
  76         return value ? "yes" : "no";
  77 }
  78
  79 /**
  80  * tomoyo_print_name_union - Print a tomoyo_name_union.
  81  *
  82  * @head: Pointer to "struct tomoyo_io_buffer".
  83  * @ptr:  Pointer to "struct tomoyo_name_union".
  84  *
  85  * Returns true on success, false otherwise.
  86  */
  87 static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
  88                                  const struct tomoyo_name_union *ptr)
  89 {
  90         int pos = head->read_avail;
  91         if (pos && head->read_buf[pos - 1] == ' ')
  92                 head->read_avail--;
  93         if (ptr->is_group)
  94                 return tomoyo_io_printf(head, " @%s",
  95                                         ptr->group->group_name->name);
  96         return tomoyo_io_printf(head, " %s", ptr->filename->name);
  97 }
  98
  99 /**
 100  * tomoyo_print_number_union - Print a tomoyo_number_union.
 101  *
 102  * @head:       Pointer to "struct tomoyo_io_buffer".
 103  * @ptr:        Pointer to "struct tomoyo_number_union".
 104  *
 105  * Returns true on success, false otherwise.
 106  */
 107 bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 108                                const struct tomoyo_number_union *ptr)
 109 {
 110         unsigned long min;
 111         unsigned long max;
 112         u8 min_type;
 113         u8 max_type;
 114         if (!tomoyo_io_printf(head, " "))
 115                 return false;
 116         if (ptr->is_group)
 117                 return tomoyo_io_printf(head, "@%s",
 118                                         ptr->group->group_name->name);
 119         min_type = ptr->min_type;
 120         max_type = ptr->max_type;
 121         min = ptr->values[0];
 122         max = ptr->values[1];
 123         switch (min_type) {
 124         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 125                 if (!tomoyo_io_printf(head, "0x%lX", min))
 126                         return false;
 127                 break;
 128         case TOMOYO_VALUE_TYPE_OCTAL:
 129                 if (!tomoyo_io_printf(head, "0%lo", min))
 130                         return false;
 131                 break;
 132         default:
 133                 if (!tomoyo_io_printf(head, "%lu", min))
 134                         return false;
 135                 break;
 136         }
 137         if (min == max && min_type == max_type)
 138                 return true;
 139         switch (max_type) {
 140         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 141                 return tomoyo_io_printf(head, "-0x%lX", max);
 142         case TOMOYO_VALUE_TYPE_OCTAL:
 143                 return tomoyo_io_printf(head, "-0%lo", max);
 144         default:
 145                 return tomoyo_io_printf(head, "-%lu", max);
 146         }
 147 }
 148
 149 /**
 150  * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
 151  *
 152  * @head: Pointer to "struct tomoyo_io_buffer".
 153  * @fmt:  The printf()'s format string, followed by parameters.
 154  *
 155  * Returns true if output was written, false otherwise.
 156  *
 157  * The snprintf() will truncate, but tomoyo_io_printf() won't.
 158  */
 159 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 160 {
 161         va_list args;
 162         int len;
 163         int pos = head->read_avail;
 164         int size = head->readbuf_size - pos;
 165
 166         if (size <= 0)
 167                 return false;
 168         va_start(args, fmt);
 169         len = vsnprintf(head->read_buf + pos, size, fmt, args);
 170         va_end(args);
 171         if (pos + len >= head->readbuf_size)
 172                 return false;
 173         head->read_avail += len;
 174         return true;
 175 }
 176
 177 /**
 178  * tomoyo_find_or_assign_new_profile - Create a new profile.
 179  *
 180  * @profile: Profile number to create.
 181  *
 182  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 183  */
 184 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile
 185 (const unsigned int profile)
 186 {
 187         struct tomoyo_profile *ptr;
 188         struct tomoyo_profile *entry;
 189         if (profile >= TOMOYO_MAX_PROFILES)
 190                 return NULL;
 191         ptr = tomoyo_profile_ptr[profile];
 192         if (ptr)
 193                 return ptr;
 194         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 195         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 196                 goto out;
 197         ptr = tomoyo_profile_ptr[profile];
 198         if (!ptr && tomoyo_memory_ok(entry)) {
 199                 ptr = entry;
 200                 ptr->learning = &tomoyo_default_profile.preference;
 201                 ptr->permissive = &tomoyo_default_profile.preference;
 202                 ptr->enforcing = &tomoyo_default_profile.preference;
 203                 ptr->default_config = TOMOYO_CONFIG_DISABLED;
 204                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 205                        sizeof(ptr->config));
 206                 mb(); /* Avoid out-of-order execution. */
 207                 tomoyo_profile_ptr[profile] = ptr;
 208                 entry = NULL;
 209         }
 210         mutex_unlock(&tomoyo_policy_lock);
 211  out:
 212         kfree(entry);
 213         return ptr;
 214 }
 215
 216 /**
 217  * tomoyo_profile - Find a profile.
 218  *
 219  * @profile: Profile number to find.
 220  *
 221  * Returns pointer to "struct tomoyo_profile".
 222  */
 223 struct tomoyo_profile *tomoyo_profile(const u8 profile)
 224 {
 225         struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
 226         if (!tomoyo_policy_loaded)
 227                 return &tomoyo_default_profile;
 228         BUG_ON(!ptr);
 229         return ptr;
 230 }
 231
 232 /**
 233  * tomoyo_write_profile - Write profile table.
 234  *
 235  * @head: Pointer to "struct tomoyo_io_buffer".
 236  *
 237  * Returns 0 on success, negative value otherwise.
 238  */
 239 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 240 {
 241         char *data = head->write_buf;
 242         unsigned int i;
 243         int value;
 244         int mode;
 245         u8 config;
 246         bool use_default = false;
 247         char *cp;
 248         struct tomoyo_profile *profile;
 249         if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
 250                 return 0;
 251         i = simple_strtoul(data, &cp, 10);
 252         if (data == cp) {
 253                 profile = &tomoyo_default_profile;
 254         } else {
 255                 if (*cp != '-')
 256                         return -EINVAL;
 257                 data = cp + 1;
 258                 profile = tomoyo_find_or_assign_new_profile(i);
 259                 if (!profile)
 260                         return -EINVAL;
 261         }
 262         cp = strchr(data, '=');
 263         if (!cp)
 264                 return -EINVAL;
 265         *cp++ = '\0';
 266         if (profile != &tomoyo_default_profile)
 267                 use_default = strstr(cp, "use_default") != NULL;
 268         if (strstr(cp, "verbose=yes"))
 269                 value = 1;
 270         else if (strstr(cp, "verbose=no"))
 271                 value = 0;
 272         else
 273                 value = -1;
 274         if (!strcmp(data, "PREFERENCE::enforcing")) {
 275                 if (use_default) {
 276                         profile->enforcing = &tomoyo_default_profile.preference;
 277                         return 0;
 278                 }
 279                 profile->enforcing = &profile->preference;
 280                 if (value >= 0)
 281                         profile->preference.enforcing_verbose = value;
 282                 return 0;
 283         }
 284         if (!strcmp(data, "PREFERENCE::permissive")) {
 285                 if (use_default) {
 286                         profile->permissive = &tomoyo_default_profile.preference;
 287                         return 0;
 288                 }
 289                 profile->permissive = &profile->preference;
 290                 if (value >= 0)
 291                         profile->preference.permissive_verbose = value;
 292                 return 0;
 293         }
 294         if (!strcmp(data, "PREFERENCE::learning")) {
 295                 char *cp2;
 296                 if (use_default) {
 297                         profile->learning = &tomoyo_default_profile.preference;
 298                         return 0;
 299                 }
 300                 profile->learning = &profile->preference;
 301                 if (value >= 0)
 302                         profile->preference.learning_verbose = value;
 303                 cp2 = strstr(cp, "max_entry=");
 304                 if (cp2)
 305                         sscanf(cp2 + 10, "%u",
 306                                &profile->preference.learning_max_entry);
 307                 return 0;
 308         }
 309         if (profile == &tomoyo_default_profile)
 310                 return -EINVAL;
 311         if (!strcmp(data, "COMMENT")) {
 312                 const struct tomoyo_path_info *old_comment = profile->comment;
 313                 profile->comment = tomoyo_get_name(cp);
 314                 tomoyo_put_name(old_comment);
 315                 return 0;
 316         }
 317         if (!strcmp(data, "CONFIG")) {
 318                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 319                 config = profile->default_config;
 320         } else if (tomoyo_str_starts(&data, "CONFIG::")) {
 321                 config = 0;
 322                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 323                         if (strcmp(data, tomoyo_mac_keywords[i]))
 324                                 continue;
 325                         config = profile->config[i];
 326                         break;
 327                 }
 328                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 329                         return -EINVAL;
 330         } else {
 331                 return -EINVAL;
 332         }
 333         if (use_default) {
 334                 config = TOMOYO_CONFIG_USE_DEFAULT;
 335         } else {
 336                 for (mode = 3; mode >= 0; mode--)
 337                         if (strstr(cp, tomoyo_mode_4[mode]))
 338                                 /*
 339                                  * Update lower 3 bits in order to distinguish
 340                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 341                                  */
 342                                 config = (config & ~7) | mode;
 343         }
 344         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 345                 profile->config[i] = config;
 346         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 347                 profile->default_config = config;
 348         return 0;
 349 }
 350
 351 /**
 352  * tomoyo_read_profile - Read profile table.
 353  *
 354  * @head: Pointer to "struct tomoyo_io_buffer".
 355  *
 356  * Returns 0.
 357  */
 358 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
 359 {
 360         int index;
 361         if (head->read_eof)
 362                 return 0;
 363         if (head->read_bit)
 364                 goto body;
 365         tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
 366         tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s "
 367                          "max_entry=%u }\n",
 368                          tomoyo_yesno(tomoyo_default_profile.preference.
 369                                       learning_verbose),
 370                          tomoyo_default_profile.preference.learning_max_entry);
 371         tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n",
 372                          tomoyo_yesno(tomoyo_default_profile.preference.
 373                                       permissive_verbose));
 374         tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s }\n",
 375                          tomoyo_yesno(tomoyo_default_profile.preference.
 376                                       enforcing_verbose));
 377         head->read_bit = 1;
 378  body:
 379         for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) {
 380                 bool done;
 381                 u8 config;
 382                 int i;
 383                 int pos;
 384                 const struct tomoyo_profile *profile
 385                         = tomoyo_profile_ptr[index];
 386                 const struct tomoyo_path_info *comment;
 387                 head->read_step = index;
 388                 if (!profile)
 389                         continue;
 390                 pos = head->read_avail;
 391                 comment = profile->comment;
 392                 done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index,
 393                                         comment ? comment->name : "");
 394                 if (!done)
 395                         goto out;
 396                 config = profile->default_config;
 397                 if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index,
 398                                       tomoyo_mode_4[config & 3]))
 399                         goto out;
 400                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX +
 401                              TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 402                         config = profile->config[i];
 403                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 404                                 continue;
 405                         if (!tomoyo_io_printf(head,
 406                                               "%u-CONFIG::%s={ mode=%s }\n",
 407                                               index, tomoyo_mac_keywords[i],
 408                                               tomoyo_mode_4[config & 3]))
 409                                 goto out;
 410                 }
 411                 if (profile->learning != &tomoyo_default_profile.preference &&
 412                     !tomoyo_io_printf(head, "%u-PREFERENCE::learning={ "
 413                                       "verbose=%s max_entry=%u }\n", index,
 414                                       tomoyo_yesno(profile->preference.
 415                                                    learning_verbose),
 416                                       profile->preference.learning_max_entry))
 417                         goto out;
 418                 if (profile->permissive != &tomoyo_default_profile.preference
 419                     && !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ "
 420                                          "verbose=%s }\n", index,
 421                                          tomoyo_yesno(profile->preference.
 422                                                       permissive_verbose)))
 423                         goto out;
 424                 if (profile->enforcing != &tomoyo_default_profile.preference &&
 425                     !tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ "
 426                                       "verbose=%s }\n", index,
 427                                       tomoyo_yesno(profile->preference.
 428                                                    enforcing_verbose)))
 429                         goto out;
 430                 continue;
 431  out:
 432                 head->read_avail = pos;
 433                 break;
 434         }
 435         if (index == TOMOYO_MAX_PROFILES)
 436                 head->read_eof = true;
 437         return 0;
 438 }
 439
 440 /*
 441  * tomoyo_policy_manager_list is used for holding list of domainnames or
 442  * programs which are permitted to modify configuration via
 443  * /sys/kernel/security/tomoyo/ interface.
 444  *
 445  * An entry is added by
 446  *
 447  * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
 448  *                                        /sys/kernel/security/tomoyo/manager
 449  *  (if you want to specify by a domainname)
 450  *
 451  *  or
 452  *
 453  * # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager
 454  *  (if you want to specify by a program's location)
 455  *
 456  * and is deleted by
 457  *
 458  * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
 459  *                                        /sys/kernel/security/tomoyo/manager
 460  *
 461  *  or
 462  *
 463  * # echo 'delete /usr/sbin/tomoyo-editpolicy' > \
 464  *                                        /sys/kernel/security/tomoyo/manager
 465  *
 466  * and all entries are retrieved by
 467  *
 468  * # cat /sys/kernel/security/tomoyo/manager
 469  */
 470 LIST_HEAD(tomoyo_policy_manager_list);
 471
 472 /**
 473  * tomoyo_update_manager_entry - Add a manager entry.
 474  *
 475  * @manager:   The path to manager or the domainnamme.
 476  * @is_delete: True if it is a delete request.
 477  *
 478  * Returns 0 on success, negative value otherwise.
 479  *
 480  * Caller holds tomoyo_read_lock().
 481  */
 482 static int tomoyo_update_manager_entry(const char *manager,
 483                                        const bool is_delete)
 484 {
 485         struct tomoyo_policy_manager_entry *ptr;
 486         struct tomoyo_policy_manager_entry e = { };
 487         int error = is_delete ? -ENOENT : -ENOMEM;
 488
 489         if (tomoyo_is_domain_def(manager)) {
 490                 if (!tomoyo_is_correct_domain(manager))
 491                         return -EINVAL;
 492                 e.is_domain = true;
 493         } else {
 494                 if (!tomoyo_is_correct_path(manager))
 495                         return -EINVAL;
 496         }
 497         e.manager = tomoyo_get_name(manager);
 498         if (!e.manager)
 499                 return -ENOMEM;
 500         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 501                 goto out;
 502         list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
 503                 if (ptr->manager != e.manager)
 504                         continue;
 505                 ptr->is_deleted = is_delete;
 506                 error = 0;
 507                 break;
 508         }
 509         if (!is_delete && error) {
 510                 struct tomoyo_policy_manager_entry *entry =
 511                         tomoyo_commit_ok(&e, sizeof(e));
 512                 if (entry) {
 513                         list_add_tail_rcu(&entry->list,
 514                                           &tomoyo_policy_manager_list);
 515                         error = 0;
 516                 }
 517         }
 518         mutex_unlock(&tomoyo_policy_lock);
 519  out:
 520         tomoyo_put_name(e.manager);
 521         return error;
 522 }
 523
 524 /**
 525  * tomoyo_write_manager_policy - Write manager policy.
 526  *
 527  * @head: Pointer to "struct tomoyo_io_buffer".
 528  *
 529  * Returns 0 on success, negative value otherwise.
 530  *
 531  * Caller holds tomoyo_read_lock().
 532  */
 533 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
 534 {
 535         char *data = head->write_buf;
 536         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
 537
 538         if (!strcmp(data, "manage_by_non_root")) {
 539                 tomoyo_manage_by_non_root = !is_delete;
 540                 return 0;
 541         }
 542         return tomoyo_update_manager_entry(data, is_delete);
 543 }
 544
 545 /**
 546  * tomoyo_read_manager_policy - Read manager policy.
 547  *
 548  * @head: Pointer to "struct tomoyo_io_buffer".
 549  *
 550  * Returns 0.
 551  *
 552  * Caller holds tomoyo_read_lock().
 553  */
 554 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
 555 {
 556         struct list_head *pos;
 557         bool done = true;
 558
 559         if (head->read_eof)
 560                 return 0;
 561         list_for_each_cookie(pos, head->read_var2,
 562                              &tomoyo_policy_manager_list) {
 563                 struct tomoyo_policy_manager_entry *ptr;
 564                 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
 565                                  list);
 566                 if (ptr->is_deleted)
 567                         continue;
 568                 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
 569                 if (!done)
 570                         break;
 571         }
 572         head->read_eof = done;
 573         return 0;
 574 }
 575
 576 /**
 577  * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
 578  *
 579  * Returns true if the current process is permitted to modify policy
 580  * via /sys/kernel/security/tomoyo/ interface.
 581  *
 582  * Caller holds tomoyo_read_lock().
 583  */
 584 static bool tomoyo_is_policy_manager(void)
 585 {
 586         struct tomoyo_policy_manager_entry *ptr;
 587         const char *exe;
 588         const struct task_struct *task = current;
 589         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 590         bool found = false;
 591
 592         if (!tomoyo_policy_loaded)
 593                 return true;
 594         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 595                 return false;
 596         list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
 597                 if (!ptr->is_deleted && ptr->is_domain
 598                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 599                         found = true;
 600                         break;
 601                 }
 602         }
 603         if (found)
 604                 return true;
 605         exe = tomoyo_get_exe();
 606         if (!exe)
 607                 return false;
 608         list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
 609                 if (!ptr->is_deleted && !ptr->is_domain
 610                     && !strcmp(exe, ptr->manager->name)) {
 611                         found = true;
 612                         break;
 613                 }
 614         }
 615         if (!found) { /* Reduce error messages. */
 616                 static pid_t last_pid;
 617                 const pid_t pid = current->pid;
 618                 if (last_pid != pid) {
 619                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 620                                "update policies.\n", domainname->name, exe);
 621                         last_pid = pid;
 622                 }
 623         }
 624         kfree(exe);
 625         return found;
 626 }
 627
 628 /**
 629  * tomoyo_is_select_one - Parse select command.
 630  *
 631  * @head: Pointer to "struct tomoyo_io_buffer".
 632  * @data: String to parse.
 633  *
 634  * Returns true on success, false otherwise.
 635  *
 636  * Caller holds tomoyo_read_lock().
 637  */
 638 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
 639                                  const char *data)
 640 {
 641         unsigned int pid;
 642         struct tomoyo_domain_info *domain = NULL;
 643         bool global_pid = false;
 644
 645         if (sscanf(data, "pid=%u", &pid) == 1 ||
 646             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 647                 struct task_struct *p;
 648                 rcu_read_lock();
 649                 read_lock(&tasklist_lock);
 650                 if (global_pid)
 651                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 652                 else
 653                         p = find_task_by_vpid(pid);
 654                 if (p)
 655                         domain = tomoyo_real_domain(p);
 656                 read_unlock(&tasklist_lock);
 657                 rcu_read_unlock();
 658         } else if (!strncmp(data, "domain=", 7)) {
 659                 if (tomoyo_is_domain_def(data + 7))
 660                         domain = tomoyo_find_domain(data + 7);
 661         } else
 662                 return false;
 663         head->write_var1 = domain;
 664         /* Accessing read_buf is safe because head->io_sem is held. */
 665         if (!head->read_buf)
 666                 return true; /* Do nothing if open(O_WRONLY). */
 667         head->read_avail = 0;
 668         tomoyo_io_printf(head, "# select %s\n", data);
 669         head->read_single_domain = true;
 670         head->read_eof = !domain;
 671         if (domain) {
 672                 struct tomoyo_domain_info *d;
 673                 head->read_var1 = NULL;
 674                 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
 675                         if (d == domain)
 676                                 break;
 677                         head->read_var1 = &d->list;
 678                 }
 679                 head->read_var2 = NULL;
 680                 head->read_bit = 0;
 681                 head->read_step = 0;
 682                 if (domain->is_deleted)
 683                         tomoyo_io_printf(head, "# This is a deleted domain.\n");
 684         }
 685         return true;
 686 }
 687
 688 /**
 689  * tomoyo_delete_domain - Delete a domain.
 690  *
 691  * @domainname: The name of domain.
 692  *
 693  * Returns 0.
 694  *
 695  * Caller holds tomoyo_read_lock().
 696  */
 697 static int tomoyo_delete_domain(char *domainname)
 698 {
 699         struct tomoyo_domain_info *domain;
 700         struct tomoyo_path_info name;
 701
 702         name.name = domainname;
 703         tomoyo_fill_path_info(&name);
 704         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 705                 return 0;
 706         /* Is there an active domain? */
 707         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 708                 /* Never delete tomoyo_kernel_domain */
 709                 if (domain == &tomoyo_kernel_domain)
 710                         continue;
 711                 if (domain->is_deleted ||
 712                     tomoyo_pathcmp(domain->domainname, &name))
 713                         continue;
 714                 domain->is_deleted = true;
 715                 break;
 716         }
 717         mutex_unlock(&tomoyo_policy_lock);
 718         return 0;
 719 }
 720
 721 /**
 722  * tomoyo_write_domain_policy2 - Write domain policy.
 723  *
 724  * @head: Pointer to "struct tomoyo_io_buffer".
 725  *
 726  * Returns 0 on success, negative value otherwise.
 727  *
 728  * Caller holds tomoyo_read_lock().
 729  */
 730 static int tomoyo_write_domain_policy2(char *data,
 731                                        struct tomoyo_domain_info *domain,
 732                                        const bool is_delete)
 733 {
 734         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
 735                 return tomoyo_write_mount_policy(data, domain, is_delete);
 736         return tomoyo_write_file_policy(data, domain, is_delete);
 737 }
 738
 739 /**
 740  * tomoyo_write_domain_policy - Write domain policy.
 741  *
 742  * @head: Pointer to "struct tomoyo_io_buffer".
 743  *
 744  * Returns 0 on success, negative value otherwise.
 745  *
 746  * Caller holds tomoyo_read_lock().
 747  */
 748 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
 749 {
 750         char *data = head->write_buf;
 751         struct tomoyo_domain_info *domain = head->write_var1;
 752         bool is_delete = false;
 753         bool is_select = false;
 754         unsigned int profile;
 755
 756         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
 757                 is_delete = true;
 758         else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
 759                 is_select = true;
 760         if (is_select && tomoyo_is_select_one(head, data))
 761                 return 0;
 762         /* Don't allow updating policies by non manager programs. */
 763         if (!tomoyo_is_policy_manager())
 764                 return -EPERM;
 765         if (tomoyo_is_domain_def(data)) {
 766                 domain = NULL;
 767                 if (is_delete)
 768                         tomoyo_delete_domain(data);
 769                 else if (is_select)
 770                         domain = tomoyo_find_domain(data);
 771                 else
 772                         domain = tomoyo_find_or_assign_new_domain(data, 0);
 773                 head->write_var1 = domain;
 774                 return 0;
 775         }
 776         if (!domain)
 777                 return -EINVAL;
 778
 779         if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
 780             && profile < TOMOYO_MAX_PROFILES) {
 781                 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
 782                         domain->profile = (u8) profile;
 783                 return 0;
 784         }
 785         if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
 786                 domain->ignore_global_allow_read = !is_delete;
 787                 return 0;
 788         }
 789         if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
 790                 domain->quota_warned = !is_delete;
 791                 return 0;
 792         }
 793         if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
 794                 domain->transition_failed = !is_delete;
 795                 return 0;
 796         }
 797         return tomoyo_write_domain_policy2(data, domain, is_delete);
 798 }
 799
 800 /**
 801  * tomoyo_print_path_acl - Print a single path ACL entry.
 802  *
 803  * @head: Pointer to "struct tomoyo_io_buffer".
 804  * @ptr:  Pointer to "struct tomoyo_path_acl".
 805  *
 806  * Returns true on success, false otherwise.
 807  */
 808 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
 809                                   struct tomoyo_path_acl *ptr)
 810 {
 811         int pos;
 812         u8 bit;
 813         const u16 perm = ptr->perm;
 814
 815         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
 816                 if (!(perm & (1 << bit)))
 817                         continue;
 818                 /* Print "read/write" instead of "read" and "write". */
 819                 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
 820                     && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
 821                         continue;
 822                 pos = head->read_avail;
 823                 if (!tomoyo_io_printf(head, "allow_%s ",
 824                                       tomoyo_path2keyword(bit)) ||
 825                     !tomoyo_print_name_union(head, &ptr->name) ||
 826                     !tomoyo_io_printf(head, "\n"))
 827                         goto out;
 828         }
 829         head->read_bit = 0;
 830         return true;
 831  out:
 832         head->read_bit = bit;
 833         head->read_avail = pos;
 834         return false;
 835 }
 836
 837 /**
 838  * tomoyo_print_path2_acl - Print a double path ACL entry.
 839  *
 840  * @head: Pointer to "struct tomoyo_io_buffer".
 841  * @ptr:  Pointer to "struct tomoyo_path2_acl".
 842  *
 843  * Returns true on success, false otherwise.
 844  */
 845 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
 846                                    struct tomoyo_path2_acl *ptr)
 847 {
 848         int pos;
 849         const u8 perm = ptr->perm;
 850         u8 bit;
 851
 852         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
 853                 if (!(perm & (1 << bit)))
 854                         continue;
 855                 pos = head->read_avail;
 856                 if (!tomoyo_io_printf(head, "allow_%s ",
 857                                       tomoyo_path22keyword(bit)) ||
 858                     !tomoyo_print_name_union(head, &ptr->name1) ||
 859                     !tomoyo_print_name_union(head, &ptr->name2) ||
 860                     !tomoyo_io_printf(head, "\n"))
 861                         goto out;
 862         }
 863         head->read_bit = 0;
 864         return true;
 865  out:
 866         head->read_bit = bit;
 867         head->read_avail = pos;
 868         return false;
 869 }
 870
 871 /**
 872  * tomoyo_print_path_number_acl - Print a path_number ACL entry.
 873  *
 874  * @head: Pointer to "struct tomoyo_io_buffer".
 875  * @ptr:  Pointer to "struct tomoyo_path_number_acl".
 876  *
 877  * Returns true on success, false otherwise.
 878  */
 879 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
 880                                          struct tomoyo_path_number_acl *ptr)
 881 {
 882         int pos;
 883         u8 bit;
 884         const u8 perm = ptr->perm;
 885         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
 886              bit++) {
 887                 if (!(perm & (1 << bit)))
 888                         continue;
 889                 pos = head->read_avail;
 890                 if (!tomoyo_io_printf(head, "allow_%s",
 891                                       tomoyo_path_number2keyword(bit)) ||
 892                     !tomoyo_print_name_union(head, &ptr->name) ||
 893                     !tomoyo_print_number_union(head, &ptr->number) ||
 894                     !tomoyo_io_printf(head, "\n"))
 895                         goto out;
 896         }
 897         head->read_bit = 0;
 898         return true;
 899  out:
 900         head->read_bit = bit;
 901         head->read_avail = pos;
 902         return false;
 903 }
 904
 905 /**
 906  * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry.
 907  *
 908  * @head: Pointer to "struct tomoyo_io_buffer".
 909  * @ptr:  Pointer to "struct tomoyo_path_number3_acl".
 910  *
 911  * Returns true on success, false otherwise.
 912  */
 913 static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head,
 914                                           struct tomoyo_path_number3_acl *ptr)
 915 {
 916         int pos;
 917         u8 bit;
 918         const u16 perm = ptr->perm;
 919         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION;
 920              bit++) {
 921                 if (!(perm & (1 << bit)))
 922                         continue;
 923                 pos = head->read_avail;
 924                 if (!tomoyo_io_printf(head, "allow_%s",
 925                                       tomoyo_path_number32keyword(bit)) ||
 926                     !tomoyo_print_name_union(head, &ptr->name) ||
 927                     !tomoyo_print_number_union(head, &ptr->mode) ||
 928                     !tomoyo_print_number_union(head, &ptr->major) ||
 929                     !tomoyo_print_number_union(head, &ptr->minor) ||
 930                     !tomoyo_io_printf(head, "\n"))
 931                         goto out;
 932         }
 933         head->read_bit = 0;
 934         return true;
 935  out:
 936         head->read_bit = bit;
 937         head->read_avail = pos;
 938         return false;
 939 }
 940
 941 /**
 942  * tomoyo_print_mount_acl - Print a mount ACL entry.
 943  *
 944  * @head: Pointer to "struct tomoyo_io_buffer".
 945  * @ptr:  Pointer to "struct tomoyo_mount_acl".
 946  *
 947  * Returns true on success, false otherwise.
 948  */
 949 static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
 950                                    struct tomoyo_mount_acl *ptr)
 951 {
 952         const int pos = head->read_avail;
 953         if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) ||
 954             !tomoyo_print_name_union(head, &ptr->dev_name) ||
 955             !tomoyo_print_name_union(head, &ptr->dir_name) ||
 956             !tomoyo_print_name_union(head, &ptr->fs_type) ||
 957             !tomoyo_print_number_union(head, &ptr->flags) ||
 958             !tomoyo_io_printf(head, "\n")) {
 959                 head->read_avail = pos;
 960                 return false;
 961         }
 962         return true;
 963 }
 964
 965 /**
 966  * tomoyo_print_entry - Print an ACL entry.
 967  *
 968  * @head: Pointer to "struct tomoyo_io_buffer".
 969  * @ptr:  Pointer to an ACL entry.
 970  *
 971  * Returns true on success, false otherwise.
 972  */
 973 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
 974                                struct tomoyo_acl_info *ptr)
 975 {
 976         const u8 acl_type = ptr->type;
 977
 978         if (ptr->is_deleted)
 979                 return true;
 980         if (acl_type == TOMOYO_TYPE_PATH_ACL) {
 981                 struct tomoyo_path_acl *acl
 982                         = container_of(ptr, struct tomoyo_path_acl, head);
 983                 return tomoyo_print_path_acl(head, acl);
 984         }
 985         if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
 986                 struct tomoyo_path2_acl *acl
 987                         = container_of(ptr, struct tomoyo_path2_acl, head);
 988                 return tomoyo_print_path2_acl(head, acl);
 989         }
 990         if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
 991                 struct tomoyo_path_number_acl *acl
 992                         = container_of(ptr, struct tomoyo_path_number_acl,
 993                                        head);
 994                 return tomoyo_print_path_number_acl(head, acl);
 995         }
 996         if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) {
 997                 struct tomoyo_path_number3_acl *acl
 998                         = container_of(ptr, struct tomoyo_path_number3_acl,
 999                                        head);
1000                 return tomoyo_print_path_number3_acl(head, acl);
1001         }
1002         if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1003                 struct tomoyo_mount_acl *acl
1004                         = container_of(ptr, struct tomoyo_mount_acl, head);
1005                 return tomoyo_print_mount_acl(head, acl);
1006         }
1007         BUG(); /* This must not happen. */
1008         return false;
1009 }
1010
1011 /**
1012  * tomoyo_read_domain_policy - Read domain policy.
1013  *
1014  * @head: Pointer to "struct tomoyo_io_buffer".
1015  *
1016  * Returns 0.
1017  *
1018  * Caller holds tomoyo_read_lock().
1019  */
1020 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1021 {
1022         struct list_head *dpos;
1023         struct list_head *apos;
1024         bool done = true;
1025
1026         if (head->read_eof)
1027                 return 0;
1028         if (head->read_step == 0)
1029                 head->read_step = 1;
1030         list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1031                 struct tomoyo_domain_info *domain;
1032                 const char *quota_exceeded = "";
1033                 const char *transition_failed = "";
1034                 const char *ignore_global_allow_read = "";
1035                 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1036                 if (head->read_step != 1)
1037                         goto acl_loop;
1038                 if (domain->is_deleted && !head->read_single_domain)
1039                         continue;
1040                 /* Print domainname and flags. */
1041                 if (domain->quota_warned)
1042                         quota_exceeded = "quota_exceeded\n";
1043                 if (domain->transition_failed)
1044                         transition_failed = "transition_failed\n";
1045                 if (domain->ignore_global_allow_read)
1046                         ignore_global_allow_read
1047                                 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
1048                 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1049                                         "%u\n%s%s%s\n",
1050                                         domain->domainname->name,
1051                                         domain->profile, quota_exceeded,
1052                                         transition_failed,
1053                                         ignore_global_allow_read);
1054                 if (!done)
1055                         break;
1056                 head->read_step = 2;
1057 acl_loop:
1058                 if (head->read_step == 3)
1059                         goto tail_mark;
1060                 /* Print ACL entries in the domain. */
1061                 list_for_each_cookie(apos, head->read_var2,
1062                                      &domain->acl_info_list) {
1063                         struct tomoyo_acl_info *ptr
1064                                 = list_entry(apos, struct tomoyo_acl_info,
1065                                              list);
1066                         done = tomoyo_print_entry(head, ptr);
1067                         if (!done)
1068                                 break;
1069                 }
1070                 if (!done)
1071                         break;
1072                 head->read_step = 3;
1073 tail_mark:
1074                 done = tomoyo_io_printf(head, "\n");
1075                 if (!done)
1076                         break;
1077                 head->read_step = 1;
1078                 if (head->read_single_domain)
1079                         break;
1080         }
1081         head->read_eof = done;
1082         return 0;
1083 }
1084
1085 /**
1086  * tomoyo_write_domain_profile - Assign profile for specified domain.
1087  *
1088  * @head: Pointer to "struct tomoyo_io_buffer".
1089  *
1090  * Returns 0 on success, -EINVAL otherwise.
1091  *
1092  * This is equivalent to doing
1093  *
1094  *     ( echo "select " $domainname; echo "use_profile " $profile ) |
1095  *     /usr/sbin/tomoyo-loadpolicy -d
1096  *
1097  * Caller holds tomoyo_read_lock().
1098  */
1099 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1100 {
1101         char *data = head->write_buf;
1102         char *cp = strchr(data, ' ');
1103         struct tomoyo_domain_info *domain;
1104         unsigned long profile;
1105
1106         if (!cp)
1107                 return -EINVAL;
1108         *cp = '\0';
1109         domain = tomoyo_find_domain(cp + 1);
1110         if (strict_strtoul(data, 10, &profile))
1111                 return -EINVAL;
1112         if (domain && profile < TOMOYO_MAX_PROFILES
1113             && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1114                 domain->profile = (u8) profile;
1115         return 0;
1116 }
1117
1118 /**
1119  * tomoyo_read_domain_profile - Read only domainname and profile.
1120  *
1121  * @head: Pointer to "struct tomoyo_io_buffer".
1122  *
1123  * Returns list of profile number and domainname pairs.
1124  *
1125  * This is equivalent to doing
1126  *
1127  *     grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1128  *     awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1129  *     domainname = $0; } else if ( $1 == "use_profile" ) {
1130  *     print $2 " " domainname; domainname = ""; } } ; '
1131  *
1132  * Caller holds tomoyo_read_lock().
1133  */
1134 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1135 {
1136         struct list_head *pos;
1137         bool done = true;
1138
1139         if (head->read_eof)
1140                 return 0;
1141         list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1142                 struct tomoyo_domain_info *domain;
1143                 domain = list_entry(pos, struct tomoyo_domain_info, list);
1144                 if (domain->is_deleted)
1145                         continue;
1146                 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1147                                         domain->domainname->name);
1148                 if (!done)
1149                         break;
1150         }
1151         head->read_eof = done;
1152         return 0;
1153 }
1154
1155 /**
1156  * tomoyo_write_pid: Specify PID to obtain domainname.
1157  *
1158  * @head: Pointer to "struct tomoyo_io_buffer".
1159  *
1160  * Returns 0.
1161  */
1162 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1163 {
1164         unsigned long pid;
1165         /* No error check. */
1166         strict_strtoul(head->write_buf, 10, &pid);
1167         head->read_step = (int) pid;
1168         head->read_eof = false;
1169         return 0;
1170 }
1171
1172 /**
1173  * tomoyo_read_pid - Get domainname of the specified PID.
1174  *
1175  * @head: Pointer to "struct tomoyo_io_buffer".
1176  *
1177  * Returns the domainname which the specified PID is in on success,
1178  * empty string otherwise.
1179  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1180  * using read()/write() interface rather than sysctl() interface.
1181  */
1182 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1183 {
1184         if (head->read_avail == 0 && !head->read_eof) {
1185                 const int pid = head->read_step;
1186                 struct task_struct *p;
1187                 struct tomoyo_domain_info *domain = NULL;
1188                 rcu_read_lock();
1189                 read_lock(&tasklist_lock);
1190                 p = find_task_by_vpid(pid);
1191                 if (p)
1192                         domain = tomoyo_real_domain(p);
1193                 read_unlock(&tasklist_lock);
1194                 rcu_read_unlock();
1195                 if (domain)
1196                         tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1197                                          domain->domainname->name);
1198                 head->read_eof = true;
1199         }
1200         return 0;
1201 }
1202
1203 /**
1204  * tomoyo_write_exception_policy - Write exception policy.
1205  *
1206  * @head: Pointer to "struct tomoyo_io_buffer".
1207  *
1208  * Returns 0 on success, negative value otherwise.
1209  *
1210  * Caller holds tomoyo_read_lock().
1211  */
1212 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1213 {
1214         char *data = head->write_buf;
1215         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1216
1217         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1218                 return tomoyo_write_domain_keeper_policy(data, false,
1219                                                          is_delete);
1220         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1221                 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1222         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1223                 return tomoyo_write_domain_initializer_policy(data, false,
1224                                                               is_delete);
1225         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1226                 return tomoyo_write_domain_initializer_policy(data, true,
1227                                                               is_delete);
1228         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
1229                 return tomoyo_write_aggregator_policy(data, is_delete);
1230         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1231                 return tomoyo_write_alias_policy(data, is_delete);
1232         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1233                 return tomoyo_write_globally_readable_policy(data, is_delete);
1234         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1235                 return tomoyo_write_pattern_policy(data, is_delete);
1236         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1237                 return tomoyo_write_no_rewrite_policy(data, is_delete);
1238         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1239                 return tomoyo_write_path_group_policy(data, is_delete);
1240         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1241                 return tomoyo_write_number_group_policy(data, is_delete);
1242         return -EINVAL;
1243 }
1244
1245 /**
1246  * tomoyo_read_exception_policy - Read exception policy.
1247  *
1248  * @head: Pointer to "struct tomoyo_io_buffer".
1249  *
1250  * Returns 0 on success, -EINVAL otherwise.
1251  *
1252  * Caller holds tomoyo_read_lock().
1253  */
1254 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1255 {
1256         if (!head->read_eof) {
1257                 switch (head->read_step) {
1258                 case 0:
1259                         head->read_var2 = NULL;
1260                         head->read_step = 1;
1261                 case 1:
1262                         if (!tomoyo_read_domain_keeper_policy(head))
1263                                 break;
1264                         head->read_var2 = NULL;
1265                         head->read_step = 2;
1266                 case 2:
1267                         if (!tomoyo_read_globally_readable_policy(head))
1268                                 break;
1269                         head->read_var2 = NULL;
1270                         head->read_step = 3;
1271                 case 3:
1272                         head->read_var2 = NULL;
1273                         head->read_step = 4;
1274                 case 4:
1275                         if (!tomoyo_read_domain_initializer_policy(head))
1276                                 break;
1277                         head->read_var2 = NULL;
1278                         head->read_step = 5;
1279                 case 5:
1280                         if (!tomoyo_read_alias_policy(head))
1281                                 break;
1282                         head->read_var2 = NULL;
1283                         head->read_step = 6;
1284                 case 6:
1285                         if (!tomoyo_read_aggregator_policy(head))
1286                                 break;
1287                         head->read_var2 = NULL;
1288                         head->read_step = 7;
1289                 case 7:
1290                         if (!tomoyo_read_file_pattern(head))
1291                                 break;
1292                         head->read_var2 = NULL;
1293                         head->read_step = 8;
1294                 case 8:
1295                         if (!tomoyo_read_no_rewrite_policy(head))
1296                                 break;
1297                         head->read_var2 = NULL;
1298                         head->read_step = 9;
1299                 case 9:
1300                         if (!tomoyo_read_path_group_policy(head))
1301                                 break;
1302                         head->read_var1 = NULL;
1303                         head->read_var2 = NULL;
1304                         head->read_step = 10;
1305                 case 10:
1306                         if (!tomoyo_read_number_group_policy(head))
1307                                 break;
1308                         head->read_var1 = NULL;
1309                         head->read_var2 = NULL;
1310                         head->read_step = 11;
1311                 case 11:
1312                         head->read_eof = true;
1313                         break;
1314                 default:
1315                         return -EINVAL;
1316                 }
1317         }
1318         return 0;
1319 }
1320
1321 /**
1322  * tomoyo_print_header - Get header line of audit log.
1323  *
1324  * @r: Pointer to "struct tomoyo_request_info".
1325  *
1326  * Returns string representation.
1327  *
1328  * This function uses kmalloc(), so caller must kfree() if this function
1329  * didn't return NULL.
1330  */
1331 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1332 {
1333         static const char *tomoyo_mode_4[4] = {
1334                 "disabled", "learning", "permissive", "enforcing"
1335         };
1336         struct timeval tv;
1337         const pid_t gpid = task_pid_nr(current);
1338         static const int tomoyo_buffer_len = 4096;
1339         char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1340         if (!buffer)
1341                 return NULL;
1342         do_gettimeofday(&tv);
1343         snprintf(buffer, tomoyo_buffer_len - 1,
1344                  "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1345                  " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1346                  " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1347                  tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid,
1348                  (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1349                  current_uid(), current_gid(), current_euid(),
1350                  current_egid(), current_suid(), current_sgid(),
1351                  current_fsuid(), current_fsgid());
1352         return buffer;
1353 }
1354
1355 /**
1356  * tomoyo_init_audit_log - Allocate buffer for audit logs.
1357  *
1358  * @len: Required size.
1359  * @r:   Pointer to "struct tomoyo_request_info".
1360  *
1361  * Returns pointer to allocated memory.
1362  *
1363  * The @len is updated to add the header lines' size on success.
1364  *
1365  * This function uses kzalloc(), so caller must kfree() if this function
1366  * didn't return NULL.
1367  */
1368 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1369 {
1370         char *buf = NULL;
1371         const char *header;
1372         const char *domainname;
1373         if (!r->domain)
1374                 r->domain = tomoyo_domain();
1375         domainname = r->domain->domainname->name;
1376         header = tomoyo_print_header(r);
1377         if (!header)
1378                 return NULL;
1379         *len += strlen(domainname) + strlen(header) + 10;
1380         buf = kzalloc(*len, GFP_NOFS);
1381         if (buf)
1382                 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1383         kfree(header);
1384         return buf;
1385 }
1386
1387 /* Wait queue for tomoyo_query_list. */
1388 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1389
1390 /* Lock for manipulating tomoyo_query_list. */
1391 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1392
1393 /* Structure for query. */
1394 struct tomoyo_query_entry {
1395         struct list_head list;
1396         char *query;
1397         int query_len;
1398         unsigned int serial;
1399         int timer;
1400         int answer;
1401 };
1402
1403 /* The list for "struct tomoyo_query_entry". */
1404 static LIST_HEAD(tomoyo_query_list);
1405
1406 /*
1407  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1408  * interface.
1409  */
1410 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1411
1412 /**
1413  * tomoyo_supervisor - Ask for the supervisor's decision.
1414  *
1415  * @r:       Pointer to "struct tomoyo_request_info".
1416  * @fmt:     The printf()'s format string, followed by parameters.
1417  *
1418  * Returns 0 if the supervisor decided to permit the access request which
1419  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1420  * supervisor decided to retry the access request which violated the policy in
1421  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1422  */
1423 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1424 {
1425         va_list args;
1426         int error = -EPERM;
1427         int pos;
1428         int len;
1429         static unsigned int tomoyo_serial;
1430         struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1431         bool quota_exceeded = false;
1432         char *header;
1433         switch (r->mode) {
1434                 char *buffer;
1435         case TOMOYO_CONFIG_LEARNING:
1436                 if (!tomoyo_domain_quota_is_ok(r))
1437                         return 0;
1438                 va_start(args, fmt);
1439                 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1440                 va_end(args);
1441                 buffer = kmalloc(len, GFP_NOFS);
1442                 if (!buffer)
1443                         return 0;
1444                 va_start(args, fmt);
1445                 vsnprintf(buffer, len - 1, fmt, args);
1446                 va_end(args);
1447                 tomoyo_normalize_line(buffer);
1448                 tomoyo_write_domain_policy2(buffer, r->domain, false);
1449                 kfree(buffer);
1450                 /* fall through */
1451         case TOMOYO_CONFIG_PERMISSIVE:
1452                 return 0;
1453         }
1454         if (!r->domain)
1455                 r->domain = tomoyo_domain();
1456         if (!atomic_read(&tomoyo_query_observers))
1457                 return -EPERM;
1458         va_start(args, fmt);
1459         len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1460         va_end(args);
1461         header = tomoyo_init_audit_log(&len, r);
1462         if (!header)
1463                 goto out;
1464         tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1465         if (!tomoyo_query_entry)
1466                 goto out;
1467         tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1468         if (!tomoyo_query_entry->query)
1469                 goto out;
1470         len = ksize(tomoyo_query_entry->query);
1471         INIT_LIST_HEAD(&tomoyo_query_entry->list);
1472         spin_lock(&tomoyo_query_list_lock);
1473         if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1474             sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1475                 quota_exceeded = true;
1476         } else {
1477                 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1478                 tomoyo_query_entry->serial = tomoyo_serial++;
1479         }
1480         spin_unlock(&tomoyo_query_list_lock);
1481         if (quota_exceeded)
1482                 goto out;
1483         pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1484                        tomoyo_query_entry->serial, r->retry, header);
1485         kfree(header);
1486         header = NULL;
1487         va_start(args, fmt);
1488         vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1489         tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1490         va_end(args);
1491         spin_lock(&tomoyo_query_list_lock);
1492         list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1493         spin_unlock(&tomoyo_query_list_lock);
1494         /* Give 10 seconds for supervisor's opinion. */
1495         for (tomoyo_query_entry->timer = 0;
1496              atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1497              tomoyo_query_entry->timer++) {
1498                 wake_up(&tomoyo_query_wait);
1499                 set_current_state(TASK_INTERRUPTIBLE);
1500                 schedule_timeout(HZ / 10);
1501                 if (tomoyo_query_entry->answer)
1502                         break;
1503         }
1504         spin_lock(&tomoyo_query_list_lock);
1505         list_del(&tomoyo_query_entry->list);
1506         tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1507         spin_unlock(&tomoyo_query_list_lock);
1508         switch (tomoyo_query_entry->answer) {
1509         case 3: /* Asked to retry by administrator. */
1510                 error = TOMOYO_RETRY_REQUEST;
1511                 r->retry++;
1512                 break;
1513         case 1:
1514                 /* Granted by administrator. */
1515                 error = 0;
1516                 break;
1517         case 0:
1518                 /* Timed out. */
1519                 break;
1520         default:
1521                 /* Rejected by administrator. */
1522                 break;
1523         }
1524  out:
1525         if (tomoyo_query_entry)
1526                 kfree(tomoyo_query_entry->query);
1527         kfree(tomoyo_query_entry);
1528         kfree(header);
1529         return error;
1530 }
1531
1532 /**
1533  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1534  *
1535  * @file: Pointer to "struct file".
1536  * @wait: Pointer to "poll_table".
1537  *
1538  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1539  *
1540  * Waits for access requests which violated policy in enforcing mode.
1541  */
1542 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1543 {
1544         struct list_head *tmp;
1545         bool found = false;
1546         u8 i;
1547         for (i = 0; i < 2; i++) {
1548                 spin_lock(&tomoyo_query_list_lock);
1549                 list_for_each(tmp, &tomoyo_query_list) {
1550                         struct tomoyo_query_entry *ptr
1551                                 = list_entry(tmp, struct tomoyo_query_entry,
1552                                              list);
1553                         if (ptr->answer)
1554                                 continue;
1555                         found = true;
1556                         break;
1557                 }
1558                 spin_unlock(&tomoyo_query_list_lock);
1559                 if (found)
1560                         return POLLIN | POLLRDNORM;
1561                 if (i)
1562                         break;
1563                 poll_wait(file, &tomoyo_query_wait, wait);
1564         }
1565         return 0;
1566 }
1567
1568 /**
1569  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1570  *
1571  * @head: Pointer to "struct tomoyo_io_buffer".
1572  *
1573  * Returns 0.
1574  */
1575 static int tomoyo_read_query(struct tomoyo_io_buffer *head)
1576 {
1577         struct list_head *tmp;
1578         int pos = 0;
1579         int len = 0;
1580         char *buf;
1581         if (head->read_avail)
1582                 return 0;
1583         if (head->read_buf) {
1584                 kfree(head->read_buf);
1585                 head->read_buf = NULL;
1586                 head->readbuf_size = 0;
1587         }
1588         spin_lock(&tomoyo_query_list_lock);
1589         list_for_each(tmp, &tomoyo_query_list) {
1590                 struct tomoyo_query_entry *ptr
1591                         = list_entry(tmp, struct tomoyo_query_entry, list);
1592                 if (ptr->answer)
1593                         continue;
1594                 if (pos++ != head->read_step)
1595                         continue;
1596                 len = ptr->query_len;
1597                 break;
1598         }
1599         spin_unlock(&tomoyo_query_list_lock);
1600         if (!len) {
1601                 head->read_step = 0;
1602                 return 0;
1603         }
1604         buf = kzalloc(len, GFP_NOFS);
1605         if (!buf)
1606                 return 0;
1607         pos = 0;
1608         spin_lock(&tomoyo_query_list_lock);
1609         list_for_each(tmp, &tomoyo_query_list) {
1610                 struct tomoyo_query_entry *ptr
1611                         = list_entry(tmp, struct tomoyo_query_entry, list);
1612                 if (ptr->answer)
1613                         continue;
1614                 if (pos++ != head->read_step)
1615                         continue;
1616                 /*
1617                  * Some query can be skipped because tomoyo_query_list
1618                  * can change, but I don't care.
1619                  */
1620                 if (len == ptr->query_len)
1621                         memmove(buf, ptr->query, len);
1622                 break;
1623         }
1624         spin_unlock(&tomoyo_query_list_lock);
1625         if (buf[0]) {
1626                 head->read_avail = len;
1627                 head->readbuf_size = head->read_avail;
1628                 head->read_buf = buf;
1629                 head->read_step++;
1630         } else {
1631                 kfree(buf);
1632         }
1633         return 0;
1634 }
1635
1636 /**
1637  * tomoyo_write_answer - Write the supervisor's decision.
1638  *
1639  * @head: Pointer to "struct tomoyo_io_buffer".
1640  *
1641  * Returns 0 on success, -EINVAL otherwise.
1642  */
1643 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1644 {
1645         char *data = head->write_buf;
1646         struct list_head *tmp;
1647         unsigned int serial;
1648         unsigned int answer;
1649         spin_lock(&tomoyo_query_list_lock);
1650         list_for_each(tmp, &tomoyo_query_list) {
1651                 struct tomoyo_query_entry *ptr
1652                         = list_entry(tmp, struct tomoyo_query_entry, list);
1653                 ptr->timer = 0;
1654         }
1655         spin_unlock(&tomoyo_query_list_lock);
1656         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1657                 return -EINVAL;
1658         spin_lock(&tomoyo_query_list_lock);
1659         list_for_each(tmp, &tomoyo_query_list) {
1660                 struct tomoyo_query_entry *ptr
1661                         = list_entry(tmp, struct tomoyo_query_entry, list);
1662                 if (ptr->serial != serial)
1663                         continue;
1664                 if (!ptr->answer)
1665                         ptr->answer = answer;
1666                 break;
1667         }
1668         spin_unlock(&tomoyo_query_list_lock);
1669         return 0;
1670 }
1671
1672 /**
1673  * tomoyo_read_version: Get version.
1674  *
1675  * @head: Pointer to "struct tomoyo_io_buffer".
1676  *
1677  * Returns version information.
1678  */
1679 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1680 {
1681         if (!head->read_eof) {
1682                 tomoyo_io_printf(head, "2.3.0-pre");
1683                 head->read_eof = true;
1684         }
1685         return 0;
1686 }
1687
1688 /**
1689  * tomoyo_read_self_domain - Get the current process's domainname.
1690  *
1691  * @head: Pointer to "struct tomoyo_io_buffer".
1692  *
1693  * Returns the current process's domainname.
1694  */
1695 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1696 {
1697         if (!head->read_eof) {
1698                 /*
1699                  * tomoyo_domain()->domainname != NULL
1700                  * because every process belongs to a domain and
1701                  * the domain's name cannot be NULL.
1702                  */
1703                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1704                 head->read_eof = true;
1705         }
1706         return 0;
1707 }
1708
1709 /**
1710  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1711  *
1712  * @type: Type of interface.
1713  * @file: Pointer to "struct file".
1714  *
1715  * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1716  *
1717  * Caller acquires tomoyo_read_lock().
1718  */
1719 int tomoyo_open_control(const u8 type, struct file *file)
1720 {
1721         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1722
1723         if (!head)
1724                 return -ENOMEM;
1725         mutex_init(&head->io_sem);
1726         head->type = type;
1727         switch (type) {
1728         case TOMOYO_DOMAINPOLICY:
1729                 /* /sys/kernel/security/tomoyo/domain_policy */
1730                 head->write = tomoyo_write_domain_policy;
1731                 head->read = tomoyo_read_domain_policy;
1732                 break;
1733         case TOMOYO_EXCEPTIONPOLICY:
1734                 /* /sys/kernel/security/tomoyo/exception_policy */
1735                 head->write = tomoyo_write_exception_policy;
1736                 head->read = tomoyo_read_exception_policy;
1737                 break;
1738         case TOMOYO_SELFDOMAIN:
1739                 /* /sys/kernel/security/tomoyo/self_domain */
1740                 head->read = tomoyo_read_self_domain;
1741                 break;
1742         case TOMOYO_DOMAIN_STATUS:
1743                 /* /sys/kernel/security/tomoyo/.domain_status */
1744                 head->write = tomoyo_write_domain_profile;
1745                 head->read = tomoyo_read_domain_profile;
1746                 break;
1747         case TOMOYO_PROCESS_STATUS:
1748                 /* /sys/kernel/security/tomoyo/.process_status */
1749                 head->write = tomoyo_write_pid;
1750                 head->read = tomoyo_read_pid;
1751                 break;
1752         case TOMOYO_VERSION:
1753                 /* /sys/kernel/security/tomoyo/version */
1754                 head->read = tomoyo_read_version;
1755                 head->readbuf_size = 128;
1756                 break;
1757         case TOMOYO_MEMINFO:
1758                 /* /sys/kernel/security/tomoyo/meminfo */
1759                 head->write = tomoyo_write_memory_quota;
1760                 head->read = tomoyo_read_memory_counter;
1761                 head->readbuf_size = 512;
1762                 break;
1763         case TOMOYO_PROFILE:
1764                 /* /sys/kernel/security/tomoyo/profile */
1765                 head->write = tomoyo_write_profile;
1766                 head->read = tomoyo_read_profile;
1767                 break;
1768         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1769                 head->poll = tomoyo_poll_query;
1770                 head->write = tomoyo_write_answer;
1771                 head->read = tomoyo_read_query;
1772                 break;
1773         case TOMOYO_MANAGER:
1774                 /* /sys/kernel/security/tomoyo/manager */
1775                 head->write = tomoyo_write_manager_policy;
1776                 head->read = tomoyo_read_manager_policy;
1777                 break;
1778         }
1779         if (!(file->f_mode & FMODE_READ)) {
1780                 /*
1781                  * No need to allocate read_buf since it is not opened
1782                  * for reading.
1783                  */
1784                 head->read = NULL;
1785                 head->poll = NULL;
1786         } else if (!head->poll) {
1787                 /* Don't allocate read_buf for poll() access. */
1788                 if (!head->readbuf_size)
1789                         head->readbuf_size = 4096 * 2;
1790                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1791                 if (!head->read_buf) {
1792                         kfree(head);
1793                         return -ENOMEM;
1794                 }
1795         }
1796         if (!(file->f_mode & FMODE_WRITE)) {
1797                 /*
1798                  * No need to allocate write_buf since it is not opened
1799                  * for writing.
1800                  */
1801                 head->write = NULL;
1802         } else if (head->write) {
1803                 head->writebuf_size = 4096 * 2;
1804                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1805                 if (!head->write_buf) {
1806                         kfree(head->read_buf);
1807                         kfree(head);
1808                         return -ENOMEM;
1809                 }
1810         }
1811         if (type != TOMOYO_QUERY)
1812                 head->reader_idx = tomoyo_read_lock();
1813         file->private_data = head;
1814         /*
1815          * Call the handler now if the file is
1816          * /sys/kernel/security/tomoyo/self_domain
1817          * so that the user can use
1818          * cat < /sys/kernel/security/tomoyo/self_domain"
1819          * to know the current process's domainname.
1820          */
1821         if (type == TOMOYO_SELFDOMAIN)
1822                 tomoyo_read_control(file, NULL, 0);
1823         /*
1824          * If the file is /sys/kernel/security/tomoyo/query , increment the
1825          * observer counter.
1826          * The obserber counter is used by tomoyo_supervisor() to see if
1827          * there is some process monitoring /sys/kernel/security/tomoyo/query.
1828          */
1829         else if (type == TOMOYO_QUERY)
1830                 atomic_inc(&tomoyo_query_observers);
1831         return 0;
1832 }
1833
1834 /**
1835  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1836  *
1837  * @file: Pointer to "struct file".
1838  * @wait: Pointer to "poll_table".
1839  *
1840  * Waits for read readiness.
1841  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1842  */
1843 int tomoyo_poll_control(struct file *file, poll_table *wait)
1844 {
1845         struct tomoyo_io_buffer *head = file->private_data;
1846         if (!head->poll)
1847                 return -ENOSYS;
1848         return head->poll(file, wait);
1849 }
1850
1851 /**
1852  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1853  *
1854  * @file:       Pointer to "struct file".
1855  * @buffer:     Poiner to buffer to write to.
1856  * @buffer_len: Size of @buffer.
1857  *
1858  * Returns bytes read on success, negative value otherwise.
1859  *
1860  * Caller holds tomoyo_read_lock().
1861  */
1862 int tomoyo_read_control(struct file *file, char __user *buffer,
1863                         const int buffer_len)
1864 {
1865         int len = 0;
1866         struct tomoyo_io_buffer *head = file->private_data;
1867         char *cp;
1868
1869         if (!head->read)
1870                 return -ENOSYS;
1871         if (mutex_lock_interruptible(&head->io_sem))
1872                 return -EINTR;
1873         /* Call the policy handler. */
1874         len = head->read(head);
1875         if (len < 0)
1876                 goto out;
1877         /* Write to buffer. */
1878         len = head->read_avail;
1879         if (len > buffer_len)
1880                 len = buffer_len;
1881         if (!len)
1882                 goto out;
1883         /* head->read_buf changes by some functions. */
1884         cp = head->read_buf;
1885         if (copy_to_user(buffer, cp, len)) {
1886                 len = -EFAULT;
1887                 goto out;
1888         }
1889         head->read_avail -= len;
1890         memmove(cp, cp + len, head->read_avail);
1891  out:
1892         mutex_unlock(&head->io_sem);
1893         return len;
1894 }
1895
1896 /**
1897  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1898  *
1899  * @file:       Pointer to "struct file".
1900  * @buffer:     Pointer to buffer to read from.
1901  * @buffer_len: Size of @buffer.
1902  *
1903  * Returns @buffer_len on success, negative value otherwise.
1904  *
1905  * Caller holds tomoyo_read_lock().
1906  */
1907 int tomoyo_write_control(struct file *file, const char __user *buffer,
1908                          const int buffer_len)
1909 {
1910         struct tomoyo_io_buffer *head = file->private_data;
1911         int error = buffer_len;
1912         int avail_len = buffer_len;
1913         char *cp0 = head->write_buf;
1914
1915         if (!head->write)
1916                 return -ENOSYS;
1917         if (!access_ok(VERIFY_READ, buffer, buffer_len))
1918                 return -EFAULT;
1919         /* Don't allow updating policies by non manager programs. */
1920         if (head->write != tomoyo_write_pid &&
1921             head->write != tomoyo_write_domain_policy &&
1922             !tomoyo_is_policy_manager())
1923                 return -EPERM;
1924         if (mutex_lock_interruptible(&head->io_sem))
1925                 return -EINTR;
1926         /* Read a line and dispatch it to the policy handler. */
1927         while (avail_len > 0) {
1928                 char c;
1929                 if (head->write_avail >= head->writebuf_size - 1) {
1930                         error = -ENOMEM;
1931                         break;
1932                 } else if (get_user(c, buffer)) {
1933                         error = -EFAULT;
1934                         break;
1935                 }
1936                 buffer++;
1937                 avail_len--;
1938                 cp0[head->write_avail++] = c;
1939                 if (c != '\n')
1940                         continue;
1941                 cp0[head->write_avail - 1] = '\0';
1942                 head->write_avail = 0;
1943                 tomoyo_normalize_line(cp0);
1944                 head->write(head);
1945         }
1946         mutex_unlock(&head->io_sem);
1947         return error;
1948 }
1949
1950 /**
1951  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1952  *
1953  * @file: Pointer to "struct file".
1954  *
1955  * Releases memory and returns 0.
1956  *
1957  * Caller looses tomoyo_read_lock().
1958  */
1959 int tomoyo_close_control(struct file *file)
1960 {
1961         struct tomoyo_io_buffer *head = file->private_data;
1962         const bool is_write = !!head->write_buf;
1963
1964         /*
1965          * If the file is /sys/kernel/security/tomoyo/query , decrement the
1966          * observer counter.
1967          */
1968         if (head->type == TOMOYO_QUERY)
1969                 atomic_dec(&tomoyo_query_observers);
1970         else
1971                 tomoyo_read_unlock(head->reader_idx);
1972         /* Release memory used for policy I/O. */
1973         kfree(head->read_buf);
1974         head->read_buf = NULL;
1975         kfree(head->write_buf);
1976         head->write_buf = NULL;
1977         kfree(head);
1978         head = NULL;
1979         file->private_data = NULL;
1980         if (is_write)
1981                 tomoyo_run_gc();
1982         return 0;
1983 }
1984
1985 /**
1986  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
1987  */
1988 void tomoyo_check_profile(void)
1989 {
1990         struct tomoyo_domain_info *domain;
1991         const int idx = tomoyo_read_lock();
1992         tomoyo_policy_loaded = true;
1993         /* Check all profiles currently assigned to domains are defined. */
1994         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1995                 const u8 profile = domain->profile;
1996                 if (tomoyo_profile_ptr[profile])
1997                         continue;
1998                 panic("Profile %u (used by '%s') not defined.\n",
1999                       profile, domain->domainname->name);
2000         }
2001         tomoyo_read_unlock(idx);
2002         if (tomoyo_profile_version != 20090903)
2003                 panic("Profile version %u is not supported.\n",
2004                       tomoyo_profile_version);
2005         printk(KERN_INFO "TOMOYO: 2.3.0-pre   2010/06/03\n");
2006         printk(KERN_INFO "Mandatory Access Control activated.\n");
2007 }