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 static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a,
 473                                       const struct tomoyo_acl_head *b)
 474 {
 475         return container_of(a, struct tomoyo_policy_manager_entry, head)
 476                 ->manager ==
 477                 container_of(b, struct tomoyo_policy_manager_entry, head)
 478                 ->manager;
 479 }
 480
 481 /**
 482  * tomoyo_update_manager_entry - Add a manager entry.
 483  *
 484  * @manager:   The path to manager or the domainnamme.
 485  * @is_delete: True if it is a delete request.
 486  *
 487  * Returns 0 on success, negative value otherwise.
 488  *
 489  * Caller holds tomoyo_read_lock().
 490  */
 491 static int tomoyo_update_manager_entry(const char *manager,
 492                                        const bool is_delete)
 493 {
 494         struct tomoyo_policy_manager_entry e = { };
 495         int error;
 496
 497         if (tomoyo_domain_def(manager)) {
 498                 if (!tomoyo_correct_domain(manager))
 499                         return -EINVAL;
 500                 e.is_domain = true;
 501         } else {
 502                 if (!tomoyo_correct_path(manager))
 503                         return -EINVAL;
 504         }
 505         e.manager = tomoyo_get_name(manager);
 506         if (!e.manager)
 507                 return -ENOMEM;
 508         error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
 509                                      &tomoyo_policy_manager_list,
 510                                      tomoyo_same_manager_entry);
 511         tomoyo_put_name(e.manager);
 512         return error;
 513 }
 514
 515 /**
 516  * tomoyo_write_manager_policy - Write manager policy.
 517  *
 518  * @head: Pointer to "struct tomoyo_io_buffer".
 519  *
 520  * Returns 0 on success, negative value otherwise.
 521  *
 522  * Caller holds tomoyo_read_lock().
 523  */
 524 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
 525 {
 526         char *data = head->write_buf;
 527         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
 528
 529         if (!strcmp(data, "manage_by_non_root")) {
 530                 tomoyo_manage_by_non_root = !is_delete;
 531                 return 0;
 532         }
 533         return tomoyo_update_manager_entry(data, is_delete);
 534 }
 535
 536 /**
 537  * tomoyo_read_manager_policy - Read manager policy.
 538  *
 539  * @head: Pointer to "struct tomoyo_io_buffer".
 540  *
 541  * Returns 0.
 542  *
 543  * Caller holds tomoyo_read_lock().
 544  */
 545 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
 546 {
 547         struct list_head *pos;
 548         bool done = true;
 549
 550         if (head->read_eof)
 551                 return 0;
 552         list_for_each_cookie(pos, head->read_var2,
 553                              &tomoyo_policy_manager_list) {
 554                 struct tomoyo_policy_manager_entry *ptr;
 555                 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
 556                                  head.list);
 557                 if (ptr->head.is_deleted)
 558                         continue;
 559                 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
 560                 if (!done)
 561                         break;
 562         }
 563         head->read_eof = done;
 564         return 0;
 565 }
 566
 567 /**
 568  * tomoyo_policy_manager - Check whether the current process is a policy manager.
 569  *
 570  * Returns true if the current process is permitted to modify policy
 571  * via /sys/kernel/security/tomoyo/ interface.
 572  *
 573  * Caller holds tomoyo_read_lock().
 574  */
 575 static bool tomoyo_policy_manager(void)
 576 {
 577         struct tomoyo_policy_manager_entry *ptr;
 578         const char *exe;
 579         const struct task_struct *task = current;
 580         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 581         bool found = false;
 582
 583         if (!tomoyo_policy_loaded)
 584                 return true;
 585         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 586                 return false;
 587         list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) {
 588                 if (!ptr->head.is_deleted && ptr->is_domain
 589                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 590                         found = true;
 591                         break;
 592                 }
 593         }
 594         if (found)
 595                 return true;
 596         exe = tomoyo_get_exe();
 597         if (!exe)
 598                 return false;
 599         list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) {
 600                 if (!ptr->head.is_deleted && !ptr->is_domain
 601                     && !strcmp(exe, ptr->manager->name)) {
 602                         found = true;
 603                         break;
 604                 }
 605         }
 606         if (!found) { /* Reduce error messages. */
 607                 static pid_t last_pid;
 608                 const pid_t pid = current->pid;
 609                 if (last_pid != pid) {
 610                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 611                                "update policies.\n", domainname->name, exe);
 612                         last_pid = pid;
 613                 }
 614         }
 615         kfree(exe);
 616         return found;
 617 }
 618
 619 /**
 620  * tomoyo_select_one - Parse select command.
 621  *
 622  * @head: Pointer to "struct tomoyo_io_buffer".
 623  * @data: String to parse.
 624  *
 625  * Returns true on success, false otherwise.
 626  *
 627  * Caller holds tomoyo_read_lock().
 628  */
 629 static bool tomoyo_select_one(struct tomoyo_io_buffer *head,
 630                                  const char *data)
 631 {
 632         unsigned int pid;
 633         struct tomoyo_domain_info *domain = NULL;
 634         bool global_pid = false;
 635
 636         if (sscanf(data, "pid=%u", &pid) == 1 ||
 637             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 638                 struct task_struct *p;
 639                 rcu_read_lock();
 640                 read_lock(&tasklist_lock);
 641                 if (global_pid)
 642                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 643                 else
 644                         p = find_task_by_vpid(pid);
 645                 if (p)
 646                         domain = tomoyo_real_domain(p);
 647                 read_unlock(&tasklist_lock);
 648                 rcu_read_unlock();
 649         } else if (!strncmp(data, "domain=", 7)) {
 650                 if (tomoyo_domain_def(data + 7))
 651                         domain = tomoyo_find_domain(data + 7);
 652         } else
 653                 return false;
 654         head->write_var1 = domain;
 655         /* Accessing read_buf is safe because head->io_sem is held. */
 656         if (!head->read_buf)
 657                 return true; /* Do nothing if open(O_WRONLY). */
 658         head->read_avail = 0;
 659         tomoyo_io_printf(head, "# select %s\n", data);
 660         head->read_single_domain = true;
 661         head->read_eof = !domain;
 662         if (domain) {
 663                 struct tomoyo_domain_info *d;
 664                 head->read_var1 = NULL;
 665                 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
 666                         if (d == domain)
 667                                 break;
 668                         head->read_var1 = &d->list;
 669                 }
 670                 head->read_var2 = NULL;
 671                 head->read_bit = 0;
 672                 head->read_step = 0;
 673                 if (domain->is_deleted)
 674                         tomoyo_io_printf(head, "# This is a deleted domain.\n");
 675         }
 676         return true;
 677 }
 678
 679 /**
 680  * tomoyo_delete_domain - Delete a domain.
 681  *
 682  * @domainname: The name of domain.
 683  *
 684  * Returns 0.
 685  *
 686  * Caller holds tomoyo_read_lock().
 687  */
 688 static int tomoyo_delete_domain(char *domainname)
 689 {
 690         struct tomoyo_domain_info *domain;
 691         struct tomoyo_path_info name;
 692
 693         name.name = domainname;
 694         tomoyo_fill_path_info(&name);
 695         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 696                 return 0;
 697         /* Is there an active domain? */
 698         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 699                 /* Never delete tomoyo_kernel_domain */
 700                 if (domain == &tomoyo_kernel_domain)
 701                         continue;
 702                 if (domain->is_deleted ||
 703                     tomoyo_pathcmp(domain->domainname, &name))
 704                         continue;
 705                 domain->is_deleted = true;
 706                 break;
 707         }
 708         mutex_unlock(&tomoyo_policy_lock);
 709         return 0;
 710 }
 711
 712 /**
 713  * tomoyo_write_domain_policy2 - Write domain policy.
 714  *
 715  * @head: Pointer to "struct tomoyo_io_buffer".
 716  *
 717  * Returns 0 on success, negative value otherwise.
 718  *
 719  * Caller holds tomoyo_read_lock().
 720  */
 721 static int tomoyo_write_domain_policy2(char *data,
 722                                        struct tomoyo_domain_info *domain,
 723                                        const bool is_delete)
 724 {
 725         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
 726                 return tomoyo_write_mount_policy(data, domain, is_delete);
 727         return tomoyo_write_file_policy(data, domain, is_delete);
 728 }
 729
 730 /**
 731  * tomoyo_write_domain_policy - Write domain policy.
 732  *
 733  * @head: Pointer to "struct tomoyo_io_buffer".
 734  *
 735  * Returns 0 on success, negative value otherwise.
 736  *
 737  * Caller holds tomoyo_read_lock().
 738  */
 739 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
 740 {
 741         char *data = head->write_buf;
 742         struct tomoyo_domain_info *domain = head->write_var1;
 743         bool is_delete = false;
 744         bool is_select = false;
 745         unsigned int profile;
 746
 747         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
 748                 is_delete = true;
 749         else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
 750                 is_select = true;
 751         if (is_select && tomoyo_select_one(head, data))
 752                 return 0;
 753         /* Don't allow updating policies by non manager programs. */
 754         if (!tomoyo_policy_manager())
 755                 return -EPERM;
 756         if (tomoyo_domain_def(data)) {
 757                 domain = NULL;
 758                 if (is_delete)
 759                         tomoyo_delete_domain(data);
 760                 else if (is_select)
 761                         domain = tomoyo_find_domain(data);
 762                 else
 763                         domain = tomoyo_find_or_assign_new_domain(data, 0);
 764                 head->write_var1 = domain;
 765                 return 0;
 766         }
 767         if (!domain)
 768                 return -EINVAL;
 769
 770         if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
 771             && profile < TOMOYO_MAX_PROFILES) {
 772                 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
 773                         domain->profile = (u8) profile;
 774                 return 0;
 775         }
 776         if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
 777                 domain->ignore_global_allow_read = !is_delete;
 778                 return 0;
 779         }
 780         if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
 781                 domain->quota_warned = !is_delete;
 782                 return 0;
 783         }
 784         if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
 785                 domain->transition_failed = !is_delete;
 786                 return 0;
 787         }
 788         return tomoyo_write_domain_policy2(data, domain, is_delete);
 789 }
 790
 791 /**
 792  * tomoyo_print_path_acl - Print a single path ACL entry.
 793  *
 794  * @head: Pointer to "struct tomoyo_io_buffer".
 795  * @ptr:  Pointer to "struct tomoyo_path_acl".
 796  *
 797  * Returns true on success, false otherwise.
 798  */
 799 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
 800                                   struct tomoyo_path_acl *ptr)
 801 {
 802         int pos;
 803         u8 bit;
 804         const u16 perm = ptr->perm;
 805
 806         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
 807                 if (!(perm & (1 << bit)))
 808                         continue;
 809                 /* Print "read/write" instead of "read" and "write". */
 810                 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
 811                     && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
 812                         continue;
 813                 pos = head->read_avail;
 814                 if (!tomoyo_io_printf(head, "allow_%s ",
 815                                       tomoyo_path2keyword(bit)) ||
 816                     !tomoyo_print_name_union(head, &ptr->name) ||
 817                     !tomoyo_io_printf(head, "\n"))
 818                         goto out;
 819         }
 820         head->read_bit = 0;
 821         return true;
 822  out:
 823         head->read_bit = bit;
 824         head->read_avail = pos;
 825         return false;
 826 }
 827
 828 /**
 829  * tomoyo_print_path2_acl - Print a double path ACL entry.
 830  *
 831  * @head: Pointer to "struct tomoyo_io_buffer".
 832  * @ptr:  Pointer to "struct tomoyo_path2_acl".
 833  *
 834  * Returns true on success, false otherwise.
 835  */
 836 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
 837                                    struct tomoyo_path2_acl *ptr)
 838 {
 839         int pos;
 840         const u8 perm = ptr->perm;
 841         u8 bit;
 842
 843         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
 844                 if (!(perm & (1 << bit)))
 845                         continue;
 846                 pos = head->read_avail;
 847                 if (!tomoyo_io_printf(head, "allow_%s ",
 848                                       tomoyo_path22keyword(bit)) ||
 849                     !tomoyo_print_name_union(head, &ptr->name1) ||
 850                     !tomoyo_print_name_union(head, &ptr->name2) ||
 851                     !tomoyo_io_printf(head, "\n"))
 852                         goto out;
 853         }
 854         head->read_bit = 0;
 855         return true;
 856  out:
 857         head->read_bit = bit;
 858         head->read_avail = pos;
 859         return false;
 860 }
 861
 862 /**
 863  * tomoyo_print_path_number_acl - Print a path_number ACL entry.
 864  *
 865  * @head: Pointer to "struct tomoyo_io_buffer".
 866  * @ptr:  Pointer to "struct tomoyo_path_number_acl".
 867  *
 868  * Returns true on success, false otherwise.
 869  */
 870 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
 871                                          struct tomoyo_path_number_acl *ptr)
 872 {
 873         int pos;
 874         u8 bit;
 875         const u8 perm = ptr->perm;
 876         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
 877              bit++) {
 878                 if (!(perm & (1 << bit)))
 879                         continue;
 880                 pos = head->read_avail;
 881                 if (!tomoyo_io_printf(head, "allow_%s",
 882                                       tomoyo_path_number2keyword(bit)) ||
 883                     !tomoyo_print_name_union(head, &ptr->name) ||
 884                     !tomoyo_print_number_union(head, &ptr->number) ||
 885                     !tomoyo_io_printf(head, "\n"))
 886                         goto out;
 887         }
 888         head->read_bit = 0;
 889         return true;
 890  out:
 891         head->read_bit = bit;
 892         head->read_avail = pos;
 893         return false;
 894 }
 895
 896 /**
 897  * tomoyo_print_mkdev_acl - Print a mkdev ACL entry.
 898  *
 899  * @head: Pointer to "struct tomoyo_io_buffer".
 900  * @ptr:  Pointer to "struct tomoyo_mkdev_acl".
 901  *
 902  * Returns true on success, false otherwise.
 903  */
 904 static bool tomoyo_print_mkdev_acl(struct tomoyo_io_buffer *head,
 905                                           struct tomoyo_mkdev_acl *ptr)
 906 {
 907         int pos;
 908         u8 bit;
 909         const u16 perm = ptr->perm;
 910         for (bit = head->read_bit; bit < TOMOYO_MAX_MKDEV_OPERATION;
 911              bit++) {
 912                 if (!(perm & (1 << bit)))
 913                         continue;
 914                 pos = head->read_avail;
 915                 if (!tomoyo_io_printf(head, "allow_%s",
 916                                       tomoyo_mkdev2keyword(bit)) ||
 917                     !tomoyo_print_name_union(head, &ptr->name) ||
 918                     !tomoyo_print_number_union(head, &ptr->mode) ||
 919                     !tomoyo_print_number_union(head, &ptr->major) ||
 920                     !tomoyo_print_number_union(head, &ptr->minor) ||
 921                     !tomoyo_io_printf(head, "\n"))
 922                         goto out;
 923         }
 924         head->read_bit = 0;
 925         return true;
 926  out:
 927         head->read_bit = bit;
 928         head->read_avail = pos;
 929         return false;
 930 }
 931
 932 /**
 933  * tomoyo_print_mount_acl - Print a mount ACL entry.
 934  *
 935  * @head: Pointer to "struct tomoyo_io_buffer".
 936  * @ptr:  Pointer to "struct tomoyo_mount_acl".
 937  *
 938  * Returns true on success, false otherwise.
 939  */
 940 static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
 941                                    struct tomoyo_mount_acl *ptr)
 942 {
 943         const int pos = head->read_avail;
 944         if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) ||
 945             !tomoyo_print_name_union(head, &ptr->dev_name) ||
 946             !tomoyo_print_name_union(head, &ptr->dir_name) ||
 947             !tomoyo_print_name_union(head, &ptr->fs_type) ||
 948             !tomoyo_print_number_union(head, &ptr->flags) ||
 949             !tomoyo_io_printf(head, "\n")) {
 950                 head->read_avail = pos;
 951                 return false;
 952         }
 953         return true;
 954 }
 955
 956 /**
 957  * tomoyo_print_entry - Print an ACL entry.
 958  *
 959  * @head: Pointer to "struct tomoyo_io_buffer".
 960  * @ptr:  Pointer to an ACL entry.
 961  *
 962  * Returns true on success, false otherwise.
 963  */
 964 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
 965                                struct tomoyo_acl_info *ptr)
 966 {
 967         const u8 acl_type = ptr->type;
 968
 969         if (ptr->is_deleted)
 970                 return true;
 971         if (acl_type == TOMOYO_TYPE_PATH_ACL) {
 972                 struct tomoyo_path_acl *acl
 973                         = container_of(ptr, struct tomoyo_path_acl, head);
 974                 return tomoyo_print_path_acl(head, acl);
 975         }
 976         if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
 977                 struct tomoyo_path2_acl *acl
 978                         = container_of(ptr, struct tomoyo_path2_acl, head);
 979                 return tomoyo_print_path2_acl(head, acl);
 980         }
 981         if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
 982                 struct tomoyo_path_number_acl *acl
 983                         = container_of(ptr, struct tomoyo_path_number_acl,
 984                                        head);
 985                 return tomoyo_print_path_number_acl(head, acl);
 986         }
 987         if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
 988                 struct tomoyo_mkdev_acl *acl
 989                         = container_of(ptr, struct tomoyo_mkdev_acl,
 990                                        head);
 991                 return tomoyo_print_mkdev_acl(head, acl);
 992         }
 993         if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
 994                 struct tomoyo_mount_acl *acl
 995                         = container_of(ptr, struct tomoyo_mount_acl, head);
 996                 return tomoyo_print_mount_acl(head, acl);
 997         }
 998         BUG(); /* This must not happen. */
 999         return false;
1000 }
1001
1002 /**
1003  * tomoyo_read_domain_policy - Read domain policy.
1004  *
1005  * @head: Pointer to "struct tomoyo_io_buffer".
1006  *
1007  * Returns 0.
1008  *
1009  * Caller holds tomoyo_read_lock().
1010  */
1011 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1012 {
1013         struct list_head *dpos;
1014         struct list_head *apos;
1015         bool done = true;
1016
1017         if (head->read_eof)
1018                 return 0;
1019         if (head->read_step == 0)
1020                 head->read_step = 1;
1021         list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1022                 struct tomoyo_domain_info *domain;
1023                 const char *quota_exceeded = "";
1024                 const char *transition_failed = "";
1025                 const char *ignore_global_allow_read = "";
1026                 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1027                 if (head->read_step != 1)
1028                         goto acl_loop;
1029                 if (domain->is_deleted && !head->read_single_domain)
1030                         continue;
1031                 /* Print domainname and flags. */
1032                 if (domain->quota_warned)
1033                         quota_exceeded = "quota_exceeded\n";
1034                 if (domain->transition_failed)
1035                         transition_failed = "transition_failed\n";
1036                 if (domain->ignore_global_allow_read)
1037                         ignore_global_allow_read
1038                                 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
1039                 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1040                                         "%u\n%s%s%s\n",
1041                                         domain->domainname->name,
1042                                         domain->profile, quota_exceeded,
1043                                         transition_failed,
1044                                         ignore_global_allow_read);
1045                 if (!done)
1046                         break;
1047                 head->read_step = 2;
1048 acl_loop:
1049                 if (head->read_step == 3)
1050                         goto tail_mark;
1051                 /* Print ACL entries in the domain. */
1052                 list_for_each_cookie(apos, head->read_var2,
1053                                      &domain->acl_info_list) {
1054                         struct tomoyo_acl_info *ptr
1055                                 = list_entry(apos, struct tomoyo_acl_info,
1056                                              list);
1057                         done = tomoyo_print_entry(head, ptr);
1058                         if (!done)
1059                                 break;
1060                 }
1061                 if (!done)
1062                         break;
1063                 head->read_step = 3;
1064 tail_mark:
1065                 done = tomoyo_io_printf(head, "\n");
1066                 if (!done)
1067                         break;
1068                 head->read_step = 1;
1069                 if (head->read_single_domain)
1070                         break;
1071         }
1072         head->read_eof = done;
1073         return 0;
1074 }
1075
1076 /**
1077  * tomoyo_write_domain_profile - Assign profile for specified domain.
1078  *
1079  * @head: Pointer to "struct tomoyo_io_buffer".
1080  *
1081  * Returns 0 on success, -EINVAL otherwise.
1082  *
1083  * This is equivalent to doing
1084  *
1085  *     ( echo "select " $domainname; echo "use_profile " $profile ) |
1086  *     /usr/sbin/tomoyo-loadpolicy -d
1087  *
1088  * Caller holds tomoyo_read_lock().
1089  */
1090 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1091 {
1092         char *data = head->write_buf;
1093         char *cp = strchr(data, ' ');
1094         struct tomoyo_domain_info *domain;
1095         unsigned long profile;
1096
1097         if (!cp)
1098                 return -EINVAL;
1099         *cp = '\0';
1100         domain = tomoyo_find_domain(cp + 1);
1101         if (strict_strtoul(data, 10, &profile))
1102                 return -EINVAL;
1103         if (domain && profile < TOMOYO_MAX_PROFILES
1104             && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1105                 domain->profile = (u8) profile;
1106         return 0;
1107 }
1108
1109 /**
1110  * tomoyo_read_domain_profile - Read only domainname and profile.
1111  *
1112  * @head: Pointer to "struct tomoyo_io_buffer".
1113  *
1114  * Returns list of profile number and domainname pairs.
1115  *
1116  * This is equivalent to doing
1117  *
1118  *     grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1119  *     awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1120  *     domainname = $0; } else if ( $1 == "use_profile" ) {
1121  *     print $2 " " domainname; domainname = ""; } } ; '
1122  *
1123  * Caller holds tomoyo_read_lock().
1124  */
1125 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1126 {
1127         struct list_head *pos;
1128         bool done = true;
1129
1130         if (head->read_eof)
1131                 return 0;
1132         list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1133                 struct tomoyo_domain_info *domain;
1134                 domain = list_entry(pos, struct tomoyo_domain_info, list);
1135                 if (domain->is_deleted)
1136                         continue;
1137                 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1138                                         domain->domainname->name);
1139                 if (!done)
1140                         break;
1141         }
1142         head->read_eof = done;
1143         return 0;
1144 }
1145
1146 /**
1147  * tomoyo_write_pid: Specify PID to obtain domainname.
1148  *
1149  * @head: Pointer to "struct tomoyo_io_buffer".
1150  *
1151  * Returns 0.
1152  */
1153 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1154 {
1155         unsigned long pid;
1156         /* No error check. */
1157         strict_strtoul(head->write_buf, 10, &pid);
1158         head->read_step = (int) pid;
1159         head->read_eof = false;
1160         return 0;
1161 }
1162
1163 /**
1164  * tomoyo_read_pid - Get domainname of the specified PID.
1165  *
1166  * @head: Pointer to "struct tomoyo_io_buffer".
1167  *
1168  * Returns the domainname which the specified PID is in on success,
1169  * empty string otherwise.
1170  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1171  * using read()/write() interface rather than sysctl() interface.
1172  */
1173 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1174 {
1175         if (head->read_avail == 0 && !head->read_eof) {
1176                 const int pid = head->read_step;
1177                 struct task_struct *p;
1178                 struct tomoyo_domain_info *domain = NULL;
1179                 rcu_read_lock();
1180                 read_lock(&tasklist_lock);
1181                 p = find_task_by_vpid(pid);
1182                 if (p)
1183                         domain = tomoyo_real_domain(p);
1184                 read_unlock(&tasklist_lock);
1185                 rcu_read_unlock();
1186                 if (domain)
1187                         tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1188                                          domain->domainname->name);
1189                 head->read_eof = true;
1190         }
1191         return 0;
1192 }
1193
1194 /**
1195  * tomoyo_write_exception_policy - Write exception policy.
1196  *
1197  * @head: Pointer to "struct tomoyo_io_buffer".
1198  *
1199  * Returns 0 on success, negative value otherwise.
1200  *
1201  * Caller holds tomoyo_read_lock().
1202  */
1203 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1204 {
1205         char *data = head->write_buf;
1206         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1207
1208         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1209                 return tomoyo_write_domain_keeper_policy(data, false,
1210                                                          is_delete);
1211         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1212                 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1213         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1214                 return tomoyo_write_domain_initializer_policy(data, false,
1215                                                               is_delete);
1216         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1217                 return tomoyo_write_domain_initializer_policy(data, true,
1218                                                               is_delete);
1219         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
1220                 return tomoyo_write_aggregator_policy(data, is_delete);
1221         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1222                 return tomoyo_write_alias_policy(data, is_delete);
1223         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1224                 return tomoyo_write_globally_readable_policy(data, is_delete);
1225         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1226                 return tomoyo_write_pattern_policy(data, is_delete);
1227         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1228                 return tomoyo_write_no_rewrite_policy(data, is_delete);
1229         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1230                 return tomoyo_write_path_group_policy(data, is_delete);
1231         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1232                 return tomoyo_write_number_group_policy(data, is_delete);
1233         return -EINVAL;
1234 }
1235
1236 /**
1237  * tomoyo_read_exception_policy - Read exception policy.
1238  *
1239  * @head: Pointer to "struct tomoyo_io_buffer".
1240  *
1241  * Returns 0 on success, -EINVAL otherwise.
1242  *
1243  * Caller holds tomoyo_read_lock().
1244  */
1245 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1246 {
1247         if (!head->read_eof) {
1248                 switch (head->read_step) {
1249                 case 0:
1250                         head->read_var2 = NULL;
1251                         head->read_step = 1;
1252                 case 1:
1253                         if (!tomoyo_read_domain_keeper_policy(head))
1254                                 break;
1255                         head->read_var2 = NULL;
1256                         head->read_step = 2;
1257                 case 2:
1258                         if (!tomoyo_read_globally_readable_policy(head))
1259                                 break;
1260                         head->read_var2 = NULL;
1261                         head->read_step = 3;
1262                 case 3:
1263                         head->read_var2 = NULL;
1264                         head->read_step = 4;
1265                 case 4:
1266                         if (!tomoyo_read_domain_initializer_policy(head))
1267                                 break;
1268                         head->read_var2 = NULL;
1269                         head->read_step = 5;
1270                 case 5:
1271                         if (!tomoyo_read_alias_policy(head))
1272                                 break;
1273                         head->read_var2 = NULL;
1274                         head->read_step = 6;
1275                 case 6:
1276                         if (!tomoyo_read_aggregator_policy(head))
1277                                 break;
1278                         head->read_var2 = NULL;
1279                         head->read_step = 7;
1280                 case 7:
1281                         if (!tomoyo_read_file_pattern(head))
1282                                 break;
1283                         head->read_var2 = NULL;
1284                         head->read_step = 8;
1285                 case 8:
1286                         if (!tomoyo_read_no_rewrite_policy(head))
1287                                 break;
1288                         head->read_var2 = NULL;
1289                         head->read_step = 9;
1290                 case 9:
1291                         if (!tomoyo_read_path_group_policy(head))
1292                                 break;
1293                         head->read_var1 = NULL;
1294                         head->read_var2 = NULL;
1295                         head->read_step = 10;
1296                 case 10:
1297                         if (!tomoyo_read_number_group_policy(head))
1298                                 break;
1299                         head->read_var1 = NULL;
1300                         head->read_var2 = NULL;
1301                         head->read_step = 11;
1302                 case 11:
1303                         head->read_eof = true;
1304                         break;
1305                 default:
1306                         return -EINVAL;
1307                 }
1308         }
1309         return 0;
1310 }
1311
1312 /**
1313  * tomoyo_print_header - Get header line of audit log.
1314  *
1315  * @r: Pointer to "struct tomoyo_request_info".
1316  *
1317  * Returns string representation.
1318  *
1319  * This function uses kmalloc(), so caller must kfree() if this function
1320  * didn't return NULL.
1321  */
1322 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1323 {
1324         static const char *tomoyo_mode_4[4] = {
1325                 "disabled", "learning", "permissive", "enforcing"
1326         };
1327         struct timeval tv;
1328         const pid_t gpid = task_pid_nr(current);
1329         static const int tomoyo_buffer_len = 4096;
1330         char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1331         if (!buffer)
1332                 return NULL;
1333         do_gettimeofday(&tv);
1334         snprintf(buffer, tomoyo_buffer_len - 1,
1335                  "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1336                  " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1337                  " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1338                  tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid,
1339                  (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1340                  current_uid(), current_gid(), current_euid(),
1341                  current_egid(), current_suid(), current_sgid(),
1342                  current_fsuid(), current_fsgid());
1343         return buffer;
1344 }
1345
1346 /**
1347  * tomoyo_init_audit_log - Allocate buffer for audit logs.
1348  *
1349  * @len: Required size.
1350  * @r:   Pointer to "struct tomoyo_request_info".
1351  *
1352  * Returns pointer to allocated memory.
1353  *
1354  * The @len is updated to add the header lines' size on success.
1355  *
1356  * This function uses kzalloc(), so caller must kfree() if this function
1357  * didn't return NULL.
1358  */
1359 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1360 {
1361         char *buf = NULL;
1362         const char *header;
1363         const char *domainname;
1364         if (!r->domain)
1365                 r->domain = tomoyo_domain();
1366         domainname = r->domain->domainname->name;
1367         header = tomoyo_print_header(r);
1368         if (!header)
1369                 return NULL;
1370         *len += strlen(domainname) + strlen(header) + 10;
1371         buf = kzalloc(*len, GFP_NOFS);
1372         if (buf)
1373                 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1374         kfree(header);
1375         return buf;
1376 }
1377
1378 /* Wait queue for tomoyo_query_list. */
1379 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1380
1381 /* Lock for manipulating tomoyo_query_list. */
1382 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1383
1384 /* Structure for query. */
1385 struct tomoyo_query_entry {
1386         struct list_head list;
1387         char *query;
1388         int query_len;
1389         unsigned int serial;
1390         int timer;
1391         int answer;
1392 };
1393
1394 /* The list for "struct tomoyo_query_entry". */
1395 static LIST_HEAD(tomoyo_query_list);
1396
1397 /*
1398  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1399  * interface.
1400  */
1401 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1402
1403 /**
1404  * tomoyo_supervisor - Ask for the supervisor's decision.
1405  *
1406  * @r:       Pointer to "struct tomoyo_request_info".
1407  * @fmt:     The printf()'s format string, followed by parameters.
1408  *
1409  * Returns 0 if the supervisor decided to permit the access request which
1410  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1411  * supervisor decided to retry the access request which violated the policy in
1412  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1413  */
1414 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1415 {
1416         va_list args;
1417         int error = -EPERM;
1418         int pos;
1419         int len;
1420         static unsigned int tomoyo_serial;
1421         struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1422         bool quota_exceeded = false;
1423         char *header;
1424         switch (r->mode) {
1425                 char *buffer;
1426         case TOMOYO_CONFIG_LEARNING:
1427                 if (!tomoyo_domain_quota_is_ok(r))
1428                         return 0;
1429                 va_start(args, fmt);
1430                 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1431                 va_end(args);
1432                 buffer = kmalloc(len, GFP_NOFS);
1433                 if (!buffer)
1434                         return 0;
1435                 va_start(args, fmt);
1436                 vsnprintf(buffer, len - 1, fmt, args);
1437                 va_end(args);
1438                 tomoyo_normalize_line(buffer);
1439                 tomoyo_write_domain_policy2(buffer, r->domain, false);
1440                 kfree(buffer);
1441                 /* fall through */
1442         case TOMOYO_CONFIG_PERMISSIVE:
1443                 return 0;
1444         }
1445         if (!r->domain)
1446                 r->domain = tomoyo_domain();
1447         if (!atomic_read(&tomoyo_query_observers))
1448                 return -EPERM;
1449         va_start(args, fmt);
1450         len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1451         va_end(args);
1452         header = tomoyo_init_audit_log(&len, r);
1453         if (!header)
1454                 goto out;
1455         tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1456         if (!tomoyo_query_entry)
1457                 goto out;
1458         tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1459         if (!tomoyo_query_entry->query)
1460                 goto out;
1461         len = ksize(tomoyo_query_entry->query);
1462         INIT_LIST_HEAD(&tomoyo_query_entry->list);
1463         spin_lock(&tomoyo_query_list_lock);
1464         if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1465             sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1466                 quota_exceeded = true;
1467         } else {
1468                 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1469                 tomoyo_query_entry->serial = tomoyo_serial++;
1470         }
1471         spin_unlock(&tomoyo_query_list_lock);
1472         if (quota_exceeded)
1473                 goto out;
1474         pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1475                        tomoyo_query_entry->serial, r->retry, header);
1476         kfree(header);
1477         header = NULL;
1478         va_start(args, fmt);
1479         vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1480         tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1481         va_end(args);
1482         spin_lock(&tomoyo_query_list_lock);
1483         list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1484         spin_unlock(&tomoyo_query_list_lock);
1485         /* Give 10 seconds for supervisor's opinion. */
1486         for (tomoyo_query_entry->timer = 0;
1487              atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1488              tomoyo_query_entry->timer++) {
1489                 wake_up(&tomoyo_query_wait);
1490                 set_current_state(TASK_INTERRUPTIBLE);
1491                 schedule_timeout(HZ / 10);
1492                 if (tomoyo_query_entry->answer)
1493                         break;
1494         }
1495         spin_lock(&tomoyo_query_list_lock);
1496         list_del(&tomoyo_query_entry->list);
1497         tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1498         spin_unlock(&tomoyo_query_list_lock);
1499         switch (tomoyo_query_entry->answer) {
1500         case 3: /* Asked to retry by administrator. */
1501                 error = TOMOYO_RETRY_REQUEST;
1502                 r->retry++;
1503                 break;
1504         case 1:
1505                 /* Granted by administrator. */
1506                 error = 0;
1507                 break;
1508         case 0:
1509                 /* Timed out. */
1510                 break;
1511         default:
1512                 /* Rejected by administrator. */
1513                 break;
1514         }
1515  out:
1516         if (tomoyo_query_entry)
1517                 kfree(tomoyo_query_entry->query);
1518         kfree(tomoyo_query_entry);
1519         kfree(header);
1520         return error;
1521 }
1522
1523 /**
1524  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1525  *
1526  * @file: Pointer to "struct file".
1527  * @wait: Pointer to "poll_table".
1528  *
1529  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1530  *
1531  * Waits for access requests which violated policy in enforcing mode.
1532  */
1533 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1534 {
1535         struct list_head *tmp;
1536         bool found = false;
1537         u8 i;
1538         for (i = 0; i < 2; i++) {
1539                 spin_lock(&tomoyo_query_list_lock);
1540                 list_for_each(tmp, &tomoyo_query_list) {
1541                         struct tomoyo_query_entry *ptr
1542                                 = list_entry(tmp, struct tomoyo_query_entry,
1543                                              list);
1544                         if (ptr->answer)
1545                                 continue;
1546                         found = true;
1547                         break;
1548                 }
1549                 spin_unlock(&tomoyo_query_list_lock);
1550                 if (found)
1551                         return POLLIN | POLLRDNORM;
1552                 if (i)
1553                         break;
1554                 poll_wait(file, &tomoyo_query_wait, wait);
1555         }
1556         return 0;
1557 }
1558
1559 /**
1560  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1561  *
1562  * @head: Pointer to "struct tomoyo_io_buffer".
1563  *
1564  * Returns 0.
1565  */
1566 static int tomoyo_read_query(struct tomoyo_io_buffer *head)
1567 {
1568         struct list_head *tmp;
1569         int pos = 0;
1570         int len = 0;
1571         char *buf;
1572         if (head->read_avail)
1573                 return 0;
1574         if (head->read_buf) {
1575                 kfree(head->read_buf);
1576                 head->read_buf = NULL;
1577                 head->readbuf_size = 0;
1578         }
1579         spin_lock(&tomoyo_query_list_lock);
1580         list_for_each(tmp, &tomoyo_query_list) {
1581                 struct tomoyo_query_entry *ptr
1582                         = list_entry(tmp, struct tomoyo_query_entry, list);
1583                 if (ptr->answer)
1584                         continue;
1585                 if (pos++ != head->read_step)
1586                         continue;
1587                 len = ptr->query_len;
1588                 break;
1589         }
1590         spin_unlock(&tomoyo_query_list_lock);
1591         if (!len) {
1592                 head->read_step = 0;
1593                 return 0;
1594         }
1595         buf = kzalloc(len, GFP_NOFS);
1596         if (!buf)
1597                 return 0;
1598         pos = 0;
1599         spin_lock(&tomoyo_query_list_lock);
1600         list_for_each(tmp, &tomoyo_query_list) {
1601                 struct tomoyo_query_entry *ptr
1602                         = list_entry(tmp, struct tomoyo_query_entry, list);
1603                 if (ptr->answer)
1604                         continue;
1605                 if (pos++ != head->read_step)
1606                         continue;
1607                 /*
1608                  * Some query can be skipped because tomoyo_query_list
1609                  * can change, but I don't care.
1610                  */
1611                 if (len == ptr->query_len)
1612                         memmove(buf, ptr->query, len);
1613                 break;
1614         }
1615         spin_unlock(&tomoyo_query_list_lock);
1616         if (buf[0]) {
1617                 head->read_avail = len;
1618                 head->readbuf_size = head->read_avail;
1619                 head->read_buf = buf;
1620                 head->read_step++;
1621         } else {
1622                 kfree(buf);
1623         }
1624         return 0;
1625 }
1626
1627 /**
1628  * tomoyo_write_answer - Write the supervisor's decision.
1629  *
1630  * @head: Pointer to "struct tomoyo_io_buffer".
1631  *
1632  * Returns 0 on success, -EINVAL otherwise.
1633  */
1634 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1635 {
1636         char *data = head->write_buf;
1637         struct list_head *tmp;
1638         unsigned int serial;
1639         unsigned int answer;
1640         spin_lock(&tomoyo_query_list_lock);
1641         list_for_each(tmp, &tomoyo_query_list) {
1642                 struct tomoyo_query_entry *ptr
1643                         = list_entry(tmp, struct tomoyo_query_entry, list);
1644                 ptr->timer = 0;
1645         }
1646         spin_unlock(&tomoyo_query_list_lock);
1647         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1648                 return -EINVAL;
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                 if (ptr->serial != serial)
1654                         continue;
1655                 if (!ptr->answer)
1656                         ptr->answer = answer;
1657                 break;
1658         }
1659         spin_unlock(&tomoyo_query_list_lock);
1660         return 0;
1661 }
1662
1663 /**
1664  * tomoyo_read_version: Get version.
1665  *
1666  * @head: Pointer to "struct tomoyo_io_buffer".
1667  *
1668  * Returns version information.
1669  */
1670 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1671 {
1672         if (!head->read_eof) {
1673                 tomoyo_io_printf(head, "2.3.0-pre");
1674                 head->read_eof = true;
1675         }
1676         return 0;
1677 }
1678
1679 /**
1680  * tomoyo_read_self_domain - Get the current process's domainname.
1681  *
1682  * @head: Pointer to "struct tomoyo_io_buffer".
1683  *
1684  * Returns the current process's domainname.
1685  */
1686 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1687 {
1688         if (!head->read_eof) {
1689                 /*
1690                  * tomoyo_domain()->domainname != NULL
1691                  * because every process belongs to a domain and
1692                  * the domain's name cannot be NULL.
1693                  */
1694                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1695                 head->read_eof = true;
1696         }
1697         return 0;
1698 }
1699
1700 /**
1701  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1702  *
1703  * @type: Type of interface.
1704  * @file: Pointer to "struct file".
1705  *
1706  * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1707  *
1708  * Caller acquires tomoyo_read_lock().
1709  */
1710 int tomoyo_open_control(const u8 type, struct file *file)
1711 {
1712         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1713
1714         if (!head)
1715                 return -ENOMEM;
1716         mutex_init(&head->io_sem);
1717         head->type = type;
1718         switch (type) {
1719         case TOMOYO_DOMAINPOLICY:
1720                 /* /sys/kernel/security/tomoyo/domain_policy */
1721                 head->write = tomoyo_write_domain_policy;
1722                 head->read = tomoyo_read_domain_policy;
1723                 break;
1724         case TOMOYO_EXCEPTIONPOLICY:
1725                 /* /sys/kernel/security/tomoyo/exception_policy */
1726                 head->write = tomoyo_write_exception_policy;
1727                 head->read = tomoyo_read_exception_policy;
1728                 break;
1729         case TOMOYO_SELFDOMAIN:
1730                 /* /sys/kernel/security/tomoyo/self_domain */
1731                 head->read = tomoyo_read_self_domain;
1732                 break;
1733         case TOMOYO_DOMAIN_STATUS:
1734                 /* /sys/kernel/security/tomoyo/.domain_status */
1735                 head->write = tomoyo_write_domain_profile;
1736                 head->read = tomoyo_read_domain_profile;
1737                 break;
1738         case TOMOYO_PROCESS_STATUS:
1739                 /* /sys/kernel/security/tomoyo/.process_status */
1740                 head->write = tomoyo_write_pid;
1741                 head->read = tomoyo_read_pid;
1742                 break;
1743         case TOMOYO_VERSION:
1744                 /* /sys/kernel/security/tomoyo/version */
1745                 head->read = tomoyo_read_version;
1746                 head->readbuf_size = 128;
1747                 break;
1748         case TOMOYO_MEMINFO:
1749                 /* /sys/kernel/security/tomoyo/meminfo */
1750                 head->write = tomoyo_write_memory_quota;
1751                 head->read = tomoyo_read_memory_counter;
1752                 head->readbuf_size = 512;
1753                 break;
1754         case TOMOYO_PROFILE:
1755                 /* /sys/kernel/security/tomoyo/profile */
1756                 head->write = tomoyo_write_profile;
1757                 head->read = tomoyo_read_profile;
1758                 break;
1759         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1760                 head->poll = tomoyo_poll_query;
1761                 head->write = tomoyo_write_answer;
1762                 head->read = tomoyo_read_query;
1763                 break;
1764         case TOMOYO_MANAGER:
1765                 /* /sys/kernel/security/tomoyo/manager */
1766                 head->write = tomoyo_write_manager_policy;
1767                 head->read = tomoyo_read_manager_policy;
1768                 break;
1769         }
1770         if (!(file->f_mode & FMODE_READ)) {
1771                 /*
1772                  * No need to allocate read_buf since it is not opened
1773                  * for reading.
1774                  */
1775                 head->read = NULL;
1776                 head->poll = NULL;
1777         } else if (!head->poll) {
1778                 /* Don't allocate read_buf for poll() access. */
1779                 if (!head->readbuf_size)
1780                         head->readbuf_size = 4096 * 2;
1781                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1782                 if (!head->read_buf) {
1783                         kfree(head);
1784                         return -ENOMEM;
1785                 }
1786         }
1787         if (!(file->f_mode & FMODE_WRITE)) {
1788                 /*
1789                  * No need to allocate write_buf since it is not opened
1790                  * for writing.
1791                  */
1792                 head->write = NULL;
1793         } else if (head->write) {
1794                 head->writebuf_size = 4096 * 2;
1795                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1796                 if (!head->write_buf) {
1797                         kfree(head->read_buf);
1798                         kfree(head);
1799                         return -ENOMEM;
1800                 }
1801         }
1802         if (type != TOMOYO_QUERY)
1803                 head->reader_idx = tomoyo_read_lock();
1804         file->private_data = head;
1805         /*
1806          * Call the handler now if the file is
1807          * /sys/kernel/security/tomoyo/self_domain
1808          * so that the user can use
1809          * cat < /sys/kernel/security/tomoyo/self_domain"
1810          * to know the current process's domainname.
1811          */
1812         if (type == TOMOYO_SELFDOMAIN)
1813                 tomoyo_read_control(file, NULL, 0);
1814         /*
1815          * If the file is /sys/kernel/security/tomoyo/query , increment the
1816          * observer counter.
1817          * The obserber counter is used by tomoyo_supervisor() to see if
1818          * there is some process monitoring /sys/kernel/security/tomoyo/query.
1819          */
1820         else if (type == TOMOYO_QUERY)
1821                 atomic_inc(&tomoyo_query_observers);
1822         return 0;
1823 }
1824
1825 /**
1826  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1827  *
1828  * @file: Pointer to "struct file".
1829  * @wait: Pointer to "poll_table".
1830  *
1831  * Waits for read readiness.
1832  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1833  */
1834 int tomoyo_poll_control(struct file *file, poll_table *wait)
1835 {
1836         struct tomoyo_io_buffer *head = file->private_data;
1837         if (!head->poll)
1838                 return -ENOSYS;
1839         return head->poll(file, wait);
1840 }
1841
1842 /**
1843  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1844  *
1845  * @file:       Pointer to "struct file".
1846  * @buffer:     Poiner to buffer to write to.
1847  * @buffer_len: Size of @buffer.
1848  *
1849  * Returns bytes read on success, negative value otherwise.
1850  *
1851  * Caller holds tomoyo_read_lock().
1852  */
1853 int tomoyo_read_control(struct file *file, char __user *buffer,
1854                         const int buffer_len)
1855 {
1856         int len = 0;
1857         struct tomoyo_io_buffer *head = file->private_data;
1858         char *cp;
1859
1860         if (!head->read)
1861                 return -ENOSYS;
1862         if (mutex_lock_interruptible(&head->io_sem))
1863                 return -EINTR;
1864         /* Call the policy handler. */
1865         len = head->read(head);
1866         if (len < 0)
1867                 goto out;
1868         /* Write to buffer. */
1869         len = head->read_avail;
1870         if (len > buffer_len)
1871                 len = buffer_len;
1872         if (!len)
1873                 goto out;
1874         /* head->read_buf changes by some functions. */
1875         cp = head->read_buf;
1876         if (copy_to_user(buffer, cp, len)) {
1877                 len = -EFAULT;
1878                 goto out;
1879         }
1880         head->read_avail -= len;
1881         memmove(cp, cp + len, head->read_avail);
1882  out:
1883         mutex_unlock(&head->io_sem);
1884         return len;
1885 }
1886
1887 /**
1888  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1889  *
1890  * @file:       Pointer to "struct file".
1891  * @buffer:     Pointer to buffer to read from.
1892  * @buffer_len: Size of @buffer.
1893  *
1894  * Returns @buffer_len on success, negative value otherwise.
1895  *
1896  * Caller holds tomoyo_read_lock().
1897  */
1898 int tomoyo_write_control(struct file *file, const char __user *buffer,
1899                          const int buffer_len)
1900 {
1901         struct tomoyo_io_buffer *head = file->private_data;
1902         int error = buffer_len;
1903         int avail_len = buffer_len;
1904         char *cp0 = head->write_buf;
1905
1906         if (!head->write)
1907                 return -ENOSYS;
1908         if (!access_ok(VERIFY_READ, buffer, buffer_len))
1909                 return -EFAULT;
1910         /* Don't allow updating policies by non manager programs. */
1911         if (head->write != tomoyo_write_pid &&
1912             head->write != tomoyo_write_domain_policy &&
1913             !tomoyo_policy_manager())
1914                 return -EPERM;
1915         if (mutex_lock_interruptible(&head->io_sem))
1916                 return -EINTR;
1917         /* Read a line and dispatch it to the policy handler. */
1918         while (avail_len > 0) {
1919                 char c;
1920                 if (head->write_avail >= head->writebuf_size - 1) {
1921                         error = -ENOMEM;
1922                         break;
1923                 } else if (get_user(c, buffer)) {
1924                         error = -EFAULT;
1925                         break;
1926                 }
1927                 buffer++;
1928                 avail_len--;
1929                 cp0[head->write_avail++] = c;
1930                 if (c != '\n')
1931                         continue;
1932                 cp0[head->write_avail - 1] = '\0';
1933                 head->write_avail = 0;
1934                 tomoyo_normalize_line(cp0);
1935                 head->write(head);
1936         }
1937         mutex_unlock(&head->io_sem);
1938         return error;
1939 }
1940
1941 /**
1942  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1943  *
1944  * @file: Pointer to "struct file".
1945  *
1946  * Releases memory and returns 0.
1947  *
1948  * Caller looses tomoyo_read_lock().
1949  */
1950 int tomoyo_close_control(struct file *file)
1951 {
1952         struct tomoyo_io_buffer *head = file->private_data;
1953         const bool is_write = !!head->write_buf;
1954
1955         /*
1956          * If the file is /sys/kernel/security/tomoyo/query , decrement the
1957          * observer counter.
1958          */
1959         if (head->type == TOMOYO_QUERY)
1960                 atomic_dec(&tomoyo_query_observers);
1961         else
1962                 tomoyo_read_unlock(head->reader_idx);
1963         /* Release memory used for policy I/O. */
1964         kfree(head->read_buf);
1965         head->read_buf = NULL;
1966         kfree(head->write_buf);
1967         head->write_buf = NULL;
1968         kfree(head);
1969         head = NULL;
1970         file->private_data = NULL;
1971         if (is_write)
1972                 tomoyo_run_gc();
1973         return 0;
1974 }
1975
1976 /**
1977  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
1978  */
1979 void tomoyo_check_profile(void)
1980 {
1981         struct tomoyo_domain_info *domain;
1982         const int idx = tomoyo_read_lock();
1983         tomoyo_policy_loaded = true;
1984         /* Check all profiles currently assigned to domains are defined. */
1985         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1986                 const u8 profile = domain->profile;
1987                 if (tomoyo_profile_ptr[profile])
1988                         continue;
1989                 panic("Profile %u (used by '%s') not defined.\n",
1990                       profile, domain->domainname->name);
1991         }
1992         tomoyo_read_unlock(idx);
1993         if (tomoyo_profile_version != 20090903)
1994                 panic("Profile version %u is not supported.\n",
1995                       tomoyo_profile_version);
1996         printk(KERN_INFO "TOMOYO: 2.3.0-pre   2010/06/03\n");
1997         printk(KERN_INFO "Mandatory Access Control activated.\n");
1998 }