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 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 357 {
 358         int index;
 359         if (head->read_eof)
 360                 return;
 361         if (head->read_bit)
 362                 goto body;
 363         tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
 364         tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s "
 365                          "max_entry=%u }\n",
 366                          tomoyo_yesno(tomoyo_default_profile.preference.
 367                                       learning_verbose),
 368                          tomoyo_default_profile.preference.learning_max_entry);
 369         tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n",
 370                          tomoyo_yesno(tomoyo_default_profile.preference.
 371                                       permissive_verbose));
 372         tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s }\n",
 373                          tomoyo_yesno(tomoyo_default_profile.preference.
 374                                       enforcing_verbose));
 375         head->read_bit = 1;
 376  body:
 377         for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) {
 378                 bool done;
 379                 u8 config;
 380                 int i;
 381                 int pos;
 382                 const struct tomoyo_profile *profile
 383                         = tomoyo_profile_ptr[index];
 384                 const struct tomoyo_path_info *comment;
 385                 head->read_step = index;
 386                 if (!profile)
 387                         continue;
 388                 pos = head->read_avail;
 389                 comment = profile->comment;
 390                 done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index,
 391                                         comment ? comment->name : "");
 392                 if (!done)
 393                         goto out;
 394                 config = profile->default_config;
 395                 if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index,
 396                                       tomoyo_mode_4[config & 3]))
 397                         goto out;
 398                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX +
 399                              TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 400                         config = profile->config[i];
 401                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 402                                 continue;
 403                         if (!tomoyo_io_printf(head,
 404                                               "%u-CONFIG::%s={ mode=%s }\n",
 405                                               index, tomoyo_mac_keywords[i],
 406                                               tomoyo_mode_4[config & 3]))
 407                                 goto out;
 408                 }
 409                 if (profile->learning != &tomoyo_default_profile.preference &&
 410                     !tomoyo_io_printf(head, "%u-PREFERENCE::learning={ "
 411                                       "verbose=%s max_entry=%u }\n", index,
 412                                       tomoyo_yesno(profile->preference.
 413                                                    learning_verbose),
 414                                       profile->preference.learning_max_entry))
 415                         goto out;
 416                 if (profile->permissive != &tomoyo_default_profile.preference
 417                     && !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ "
 418                                          "verbose=%s }\n", index,
 419                                          tomoyo_yesno(profile->preference.
 420                                                       permissive_verbose)))
 421                         goto out;
 422                 if (profile->enforcing != &tomoyo_default_profile.preference &&
 423                     !tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ "
 424                                       "verbose=%s }\n", index,
 425                                       tomoyo_yesno(profile->preference.
 426                                                    enforcing_verbose)))
 427                         goto out;
 428                 continue;
 429  out:
 430                 head->read_avail = pos;
 431                 break;
 432         }
 433         if (index == TOMOYO_MAX_PROFILES)
 434                 head->read_eof = true;
 435 }
 436
 437 static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a,
 438                                       const struct tomoyo_acl_head *b)
 439 {
 440         return container_of(a, struct tomoyo_policy_manager_entry, head)
 441                 ->manager ==
 442                 container_of(b, struct tomoyo_policy_manager_entry, head)
 443                 ->manager;
 444 }
 445
 446 /**
 447  * tomoyo_update_manager_entry - Add a manager entry.
 448  *
 449  * @manager:   The path to manager or the domainnamme.
 450  * @is_delete: True if it is a delete request.
 451  *
 452  * Returns 0 on success, negative value otherwise.
 453  *
 454  * Caller holds tomoyo_read_lock().
 455  */
 456 static int tomoyo_update_manager_entry(const char *manager,
 457                                        const bool is_delete)
 458 {
 459         struct tomoyo_policy_manager_entry e = { };
 460         int error;
 461
 462         if (tomoyo_domain_def(manager)) {
 463                 if (!tomoyo_correct_domain(manager))
 464                         return -EINVAL;
 465                 e.is_domain = true;
 466         } else {
 467                 if (!tomoyo_correct_path(manager))
 468                         return -EINVAL;
 469         }
 470         e.manager = tomoyo_get_name(manager);
 471         if (!e.manager)
 472                 return -ENOMEM;
 473         error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
 474                                      &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 475                                      tomoyo_same_manager_entry);
 476         tomoyo_put_name(e.manager);
 477         return error;
 478 }
 479
 480 /**
 481  * tomoyo_write_manager_policy - Write manager policy.
 482  *
 483  * @head: Pointer to "struct tomoyo_io_buffer".
 484  *
 485  * Returns 0 on success, negative value otherwise.
 486  *
 487  * Caller holds tomoyo_read_lock().
 488  */
 489 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
 490 {
 491         char *data = head->write_buf;
 492         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
 493
 494         if (!strcmp(data, "manage_by_non_root")) {
 495                 tomoyo_manage_by_non_root = !is_delete;
 496                 return 0;
 497         }
 498         return tomoyo_update_manager_entry(data, is_delete);
 499 }
 500
 501 /**
 502  * tomoyo_read_manager_policy - Read manager policy.
 503  *
 504  * @head: Pointer to "struct tomoyo_io_buffer".
 505  *
 506  * Caller holds tomoyo_read_lock().
 507  */
 508 static void tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
 509 {
 510         bool done = true;
 511
 512         if (head->read_eof)
 513                 return;
 514         list_for_each_cookie(head->read_var2,
 515                              &tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
 516                 struct tomoyo_policy_manager_entry *ptr =
 517                         list_entry(head->read_var2, typeof(*ptr), head.list);
 518                 if (ptr->head.is_deleted)
 519                         continue;
 520                 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
 521                 if (!done)
 522                         break;
 523         }
 524         head->read_eof = done;
 525 }
 526
 527 /**
 528  * tomoyo_policy_manager - Check whether the current process is a policy manager.
 529  *
 530  * Returns true if the current process is permitted to modify policy
 531  * via /sys/kernel/security/tomoyo/ interface.
 532  *
 533  * Caller holds tomoyo_read_lock().
 534  */
 535 static bool tomoyo_policy_manager(void)
 536 {
 537         struct tomoyo_policy_manager_entry *ptr;
 538         const char *exe;
 539         const struct task_struct *task = current;
 540         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 541         bool found = false;
 542
 543         if (!tomoyo_policy_loaded)
 544                 return true;
 545         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 546                 return false;
 547         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 548                                 head.list) {
 549                 if (!ptr->head.is_deleted && ptr->is_domain
 550                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 551                         found = true;
 552                         break;
 553                 }
 554         }
 555         if (found)
 556                 return true;
 557         exe = tomoyo_get_exe();
 558         if (!exe)
 559                 return false;
 560         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 561                                 head.list) {
 562                 if (!ptr->head.is_deleted && !ptr->is_domain
 563                     && !strcmp(exe, ptr->manager->name)) {
 564                         found = true;
 565                         break;
 566                 }
 567         }
 568         if (!found) { /* Reduce error messages. */
 569                 static pid_t last_pid;
 570                 const pid_t pid = current->pid;
 571                 if (last_pid != pid) {
 572                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 573                                "update policies.\n", domainname->name, exe);
 574                         last_pid = pid;
 575                 }
 576         }
 577         kfree(exe);
 578         return found;
 579 }
 580
 581 /**
 582  * tomoyo_select_one - Parse select command.
 583  *
 584  * @head: Pointer to "struct tomoyo_io_buffer".
 585  * @data: String to parse.
 586  *
 587  * Returns true on success, false otherwise.
 588  *
 589  * Caller holds tomoyo_read_lock().
 590  */
 591 static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
 592 {
 593         unsigned int pid;
 594         struct tomoyo_domain_info *domain = NULL;
 595         bool global_pid = false;
 596
 597         if (sscanf(data, "pid=%u", &pid) == 1 ||
 598             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 599                 struct task_struct *p;
 600                 rcu_read_lock();
 601                 read_lock(&tasklist_lock);
 602                 if (global_pid)
 603                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 604                 else
 605                         p = find_task_by_vpid(pid);
 606                 if (p)
 607                         domain = tomoyo_real_domain(p);
 608                 read_unlock(&tasklist_lock);
 609                 rcu_read_unlock();
 610         } else if (!strncmp(data, "domain=", 7)) {
 611                 if (tomoyo_domain_def(data + 7))
 612                         domain = tomoyo_find_domain(data + 7);
 613         } else
 614                 return false;
 615         head->write_var1 = domain;
 616         /* Accessing read_buf is safe because head->io_sem is held. */
 617         if (!head->read_buf)
 618                 return true; /* Do nothing if open(O_WRONLY). */
 619         head->read_avail = 0;
 620         tomoyo_io_printf(head, "# select %s\n", data);
 621         head->read_single_domain = true;
 622         head->read_eof = !domain;
 623         head->read_var1 = &domain->list;
 624         head->read_var2 = NULL;
 625         head->read_bit = 0;
 626         head->read_step = 0;
 627         if (domain && domain->is_deleted)
 628                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 629         return true;
 630 }
 631
 632 /**
 633  * tomoyo_delete_domain - Delete a domain.
 634  *
 635  * @domainname: The name of domain.
 636  *
 637  * Returns 0.
 638  *
 639  * Caller holds tomoyo_read_lock().
 640  */
 641 static int tomoyo_delete_domain(char *domainname)
 642 {
 643         struct tomoyo_domain_info *domain;
 644         struct tomoyo_path_info name;
 645
 646         name.name = domainname;
 647         tomoyo_fill_path_info(&name);
 648         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 649                 return 0;
 650         /* Is there an active domain? */
 651         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 652                 /* Never delete tomoyo_kernel_domain */
 653                 if (domain == &tomoyo_kernel_domain)
 654                         continue;
 655                 if (domain->is_deleted ||
 656                     tomoyo_pathcmp(domain->domainname, &name))
 657                         continue;
 658                 domain->is_deleted = true;
 659                 break;
 660         }
 661         mutex_unlock(&tomoyo_policy_lock);
 662         return 0;
 663 }
 664
 665 /**
 666  * tomoyo_write_domain_policy2 - Write domain policy.
 667  *
 668  * @head: Pointer to "struct tomoyo_io_buffer".
 669  *
 670  * Returns 0 on success, negative value otherwise.
 671  *
 672  * Caller holds tomoyo_read_lock().
 673  */
 674 static int tomoyo_write_domain_policy2(char *data,
 675                                        struct tomoyo_domain_info *domain,
 676                                        const bool is_delete)
 677 {
 678         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
 679                 return tomoyo_write_mount_policy(data, domain, is_delete);
 680         return tomoyo_write_file_policy(data, domain, is_delete);
 681 }
 682
 683 /**
 684  * tomoyo_write_domain_policy - Write domain policy.
 685  *
 686  * @head: Pointer to "struct tomoyo_io_buffer".
 687  *
 688  * Returns 0 on success, negative value otherwise.
 689  *
 690  * Caller holds tomoyo_read_lock().
 691  */
 692 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
 693 {
 694         char *data = head->write_buf;
 695         struct tomoyo_domain_info *domain = head->write_var1;
 696         bool is_delete = false;
 697         bool is_select = false;
 698         unsigned int profile;
 699
 700         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
 701                 is_delete = true;
 702         else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
 703                 is_select = true;
 704         if (is_select && tomoyo_select_one(head, data))
 705                 return 0;
 706         /* Don't allow updating policies by non manager programs. */
 707         if (!tomoyo_policy_manager())
 708                 return -EPERM;
 709         if (tomoyo_domain_def(data)) {
 710                 domain = NULL;
 711                 if (is_delete)
 712                         tomoyo_delete_domain(data);
 713                 else if (is_select)
 714                         domain = tomoyo_find_domain(data);
 715                 else
 716                         domain = tomoyo_find_or_assign_new_domain(data, 0);
 717                 head->write_var1 = domain;
 718                 return 0;
 719         }
 720         if (!domain)
 721                 return -EINVAL;
 722
 723         if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
 724             && profile < TOMOYO_MAX_PROFILES) {
 725                 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
 726                         domain->profile = (u8) profile;
 727                 return 0;
 728         }
 729         if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
 730                 domain->ignore_global_allow_read = !is_delete;
 731                 return 0;
 732         }
 733         if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
 734                 domain->quota_warned = !is_delete;
 735                 return 0;
 736         }
 737         if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
 738                 domain->transition_failed = !is_delete;
 739                 return 0;
 740         }
 741         return tomoyo_write_domain_policy2(data, domain, is_delete);
 742 }
 743
 744 /**
 745  * tomoyo_print_path_acl - Print a single path ACL entry.
 746  *
 747  * @head: Pointer to "struct tomoyo_io_buffer".
 748  * @ptr:  Pointer to "struct tomoyo_path_acl".
 749  *
 750  * Returns true on success, false otherwise.
 751  */
 752 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
 753                                   struct tomoyo_path_acl *ptr)
 754 {
 755         int pos;
 756         u8 bit;
 757         const u16 perm = ptr->perm;
 758
 759         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
 760                 if (!(perm & (1 << bit)))
 761                         continue;
 762                 /* Print "read/write" instead of "read" and "write". */
 763                 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
 764                     && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
 765                         continue;
 766                 pos = head->read_avail;
 767                 if (!tomoyo_io_printf(head, "allow_%s ",
 768                                       tomoyo_path_keyword[bit]) ||
 769                     !tomoyo_print_name_union(head, &ptr->name) ||
 770                     !tomoyo_io_printf(head, "\n"))
 771                         goto out;
 772         }
 773         head->read_bit = 0;
 774         return true;
 775  out:
 776         head->read_bit = bit;
 777         head->read_avail = pos;
 778         return false;
 779 }
 780
 781 /**
 782  * tomoyo_print_path2_acl - Print a double path ACL entry.
 783  *
 784  * @head: Pointer to "struct tomoyo_io_buffer".
 785  * @ptr:  Pointer to "struct tomoyo_path2_acl".
 786  *
 787  * Returns true on success, false otherwise.
 788  */
 789 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
 790                                    struct tomoyo_path2_acl *ptr)
 791 {
 792         int pos;
 793         const u8 perm = ptr->perm;
 794         u8 bit;
 795
 796         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
 797                 if (!(perm & (1 << bit)))
 798                         continue;
 799                 pos = head->read_avail;
 800                 if (!tomoyo_io_printf(head, "allow_%s ",
 801                                       tomoyo_path2_keyword[bit]) ||
 802                     !tomoyo_print_name_union(head, &ptr->name1) ||
 803                     !tomoyo_print_name_union(head, &ptr->name2) ||
 804                     !tomoyo_io_printf(head, "\n"))
 805                         goto out;
 806         }
 807         head->read_bit = 0;
 808         return true;
 809  out:
 810         head->read_bit = bit;
 811         head->read_avail = pos;
 812         return false;
 813 }
 814
 815 /**
 816  * tomoyo_print_path_number_acl - Print a path_number ACL entry.
 817  *
 818  * @head: Pointer to "struct tomoyo_io_buffer".
 819  * @ptr:  Pointer to "struct tomoyo_path_number_acl".
 820  *
 821  * Returns true on success, false otherwise.
 822  */
 823 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
 824                                          struct tomoyo_path_number_acl *ptr)
 825 {
 826         int pos;
 827         u8 bit;
 828         const u8 perm = ptr->perm;
 829         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
 830              bit++) {
 831                 if (!(perm & (1 << bit)))
 832                         continue;
 833                 pos = head->read_avail;
 834                 if (!tomoyo_io_printf(head, "allow_%s",
 835                                       tomoyo_path_number_keyword[bit]) ||
 836                     !tomoyo_print_name_union(head, &ptr->name) ||
 837                     !tomoyo_print_number_union(head, &ptr->number) ||
 838                     !tomoyo_io_printf(head, "\n"))
 839                         goto out;
 840         }
 841         head->read_bit = 0;
 842         return true;
 843  out:
 844         head->read_bit = bit;
 845         head->read_avail = pos;
 846         return false;
 847 }
 848
 849 /**
 850  * tomoyo_print_mkdev_acl - Print a mkdev ACL entry.
 851  *
 852  * @head: Pointer to "struct tomoyo_io_buffer".
 853  * @ptr:  Pointer to "struct tomoyo_mkdev_acl".
 854  *
 855  * Returns true on success, false otherwise.
 856  */
 857 static bool tomoyo_print_mkdev_acl(struct tomoyo_io_buffer *head,
 858                                           struct tomoyo_mkdev_acl *ptr)
 859 {
 860         int pos;
 861         u8 bit;
 862         const u16 perm = ptr->perm;
 863         for (bit = head->read_bit; bit < TOMOYO_MAX_MKDEV_OPERATION;
 864              bit++) {
 865                 if (!(perm & (1 << bit)))
 866                         continue;
 867                 pos = head->read_avail;
 868                 if (!tomoyo_io_printf(head, "allow_%s",
 869                                       tomoyo_mkdev_keyword[bit]) ||
 870                     !tomoyo_print_name_union(head, &ptr->name) ||
 871                     !tomoyo_print_number_union(head, &ptr->mode) ||
 872                     !tomoyo_print_number_union(head, &ptr->major) ||
 873                     !tomoyo_print_number_union(head, &ptr->minor) ||
 874                     !tomoyo_io_printf(head, "\n"))
 875                         goto out;
 876         }
 877         head->read_bit = 0;
 878         return true;
 879  out:
 880         head->read_bit = bit;
 881         head->read_avail = pos;
 882         return false;
 883 }
 884
 885 /**
 886  * tomoyo_print_mount_acl - Print a mount ACL entry.
 887  *
 888  * @head: Pointer to "struct tomoyo_io_buffer".
 889  * @ptr:  Pointer to "struct tomoyo_mount_acl".
 890  *
 891  * Returns true on success, false otherwise.
 892  */
 893 static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
 894                                    struct tomoyo_mount_acl *ptr)
 895 {
 896         const int pos = head->read_avail;
 897         if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) ||
 898             !tomoyo_print_name_union(head, &ptr->dev_name) ||
 899             !tomoyo_print_name_union(head, &ptr->dir_name) ||
 900             !tomoyo_print_name_union(head, &ptr->fs_type) ||
 901             !tomoyo_print_number_union(head, &ptr->flags) ||
 902             !tomoyo_io_printf(head, "\n")) {
 903                 head->read_avail = pos;
 904                 return false;
 905         }
 906         return true;
 907 }
 908
 909 /**
 910  * tomoyo_print_entry - Print an ACL entry.
 911  *
 912  * @head: Pointer to "struct tomoyo_io_buffer".
 913  * @ptr:  Pointer to an ACL entry.
 914  *
 915  * Returns true on success, false otherwise.
 916  */
 917 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
 918                                struct tomoyo_acl_info *ptr)
 919 {
 920         const u8 acl_type = ptr->type;
 921
 922         if (ptr->is_deleted)
 923                 return true;
 924         if (acl_type == TOMOYO_TYPE_PATH_ACL) {
 925                 struct tomoyo_path_acl *acl
 926                         = container_of(ptr, struct tomoyo_path_acl, head);
 927                 return tomoyo_print_path_acl(head, acl);
 928         }
 929         if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
 930                 struct tomoyo_path2_acl *acl
 931                         = container_of(ptr, struct tomoyo_path2_acl, head);
 932                 return tomoyo_print_path2_acl(head, acl);
 933         }
 934         if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
 935                 struct tomoyo_path_number_acl *acl
 936                         = container_of(ptr, struct tomoyo_path_number_acl,
 937                                        head);
 938                 return tomoyo_print_path_number_acl(head, acl);
 939         }
 940         if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
 941                 struct tomoyo_mkdev_acl *acl
 942                         = container_of(ptr, struct tomoyo_mkdev_acl,
 943                                        head);
 944                 return tomoyo_print_mkdev_acl(head, acl);
 945         }
 946         if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
 947                 struct tomoyo_mount_acl *acl
 948                         = container_of(ptr, struct tomoyo_mount_acl, head);
 949                 return tomoyo_print_mount_acl(head, acl);
 950         }
 951         BUG(); /* This must not happen. */
 952         return false;
 953 }
 954
 955 /**
 956  * tomoyo_read_domain_policy - Read domain policy.
 957  *
 958  * @head: Pointer to "struct tomoyo_io_buffer".
 959  *
 960  * Caller holds tomoyo_read_lock().
 961  */
 962 static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
 963 {
 964         bool done = true;
 965
 966         if (head->read_eof)
 967                 return;
 968         if (head->read_step == 0)
 969                 head->read_step = 1;
 970         list_for_each_cookie(head->read_var1, &tomoyo_domain_list) {
 971                 struct tomoyo_domain_info *domain =
 972                         list_entry(head->read_var1, typeof(*domain), list);
 973                 const char *quota_exceeded = "";
 974                 const char *transition_failed = "";
 975                 const char *ignore_global_allow_read = "";
 976                 if (head->read_step != 1)
 977                         goto acl_loop;
 978                 if (domain->is_deleted && !head->read_single_domain)
 979                         continue;
 980                 /* Print domainname and flags. */
 981                 if (domain->quota_warned)
 982                         quota_exceeded = "quota_exceeded\n";
 983                 if (domain->transition_failed)
 984                         transition_failed = "transition_failed\n";
 985                 if (domain->ignore_global_allow_read)
 986                         ignore_global_allow_read
 987                                 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
 988                 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
 989                                         "%u\n%s%s%s\n",
 990                                         domain->domainname->name,
 991                                         domain->profile, quota_exceeded,
 992                                         transition_failed,
 993                                         ignore_global_allow_read);
 994                 if (!done)
 995                         break;
 996                 head->read_step = 2;
 997 acl_loop:
 998                 if (head->read_step == 3)
 999                         goto tail_mark;
1000                 /* Print ACL entries in the domain. */
1001                 list_for_each_cookie(head->read_var2,
1002                                      &domain->acl_info_list) {
1003                         struct tomoyo_acl_info *ptr =
1004                                 list_entry(head->read_var2, typeof(*ptr), list);
1005                         done = tomoyo_print_entry(head, ptr);
1006                         if (!done)
1007                                 break;
1008                 }
1009                 if (!done)
1010                         break;
1011                 head->read_var2 = NULL;
1012                 head->read_step = 3;
1013 tail_mark:
1014                 done = tomoyo_io_printf(head, "\n");
1015                 if (!done)
1016                         break;
1017                 head->read_step = 1;
1018                 if (head->read_single_domain)
1019                         break;
1020         }
1021         head->read_eof = done;
1022 }
1023
1024 /**
1025  * tomoyo_write_domain_profile - Assign profile for specified domain.
1026  *
1027  * @head: Pointer to "struct tomoyo_io_buffer".
1028  *
1029  * Returns 0 on success, -EINVAL otherwise.
1030  *
1031  * This is equivalent to doing
1032  *
1033  *     ( echo "select " $domainname; echo "use_profile " $profile ) |
1034  *     /usr/sbin/tomoyo-loadpolicy -d
1035  *
1036  * Caller holds tomoyo_read_lock().
1037  */
1038 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1039 {
1040         char *data = head->write_buf;
1041         char *cp = strchr(data, ' ');
1042         struct tomoyo_domain_info *domain;
1043         unsigned long profile;
1044
1045         if (!cp)
1046                 return -EINVAL;
1047         *cp = '\0';
1048         domain = tomoyo_find_domain(cp + 1);
1049         if (strict_strtoul(data, 10, &profile))
1050                 return -EINVAL;
1051         if (domain && profile < TOMOYO_MAX_PROFILES
1052             && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1053                 domain->profile = (u8) profile;
1054         return 0;
1055 }
1056
1057 /**
1058  * tomoyo_read_domain_profile - Read only domainname and profile.
1059  *
1060  * @head: Pointer to "struct tomoyo_io_buffer".
1061  *
1062  * Returns list of profile number and domainname pairs.
1063  *
1064  * This is equivalent to doing
1065  *
1066  *     grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1067  *     awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1068  *     domainname = $0; } else if ( $1 == "use_profile" ) {
1069  *     print $2 " " domainname; domainname = ""; } } ; '
1070  *
1071  * Caller holds tomoyo_read_lock().
1072  */
1073 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1074 {
1075         bool done = true;
1076
1077         if (head->read_eof)
1078                 return;
1079         list_for_each_cookie(head->read_var1, &tomoyo_domain_list) {
1080                 struct tomoyo_domain_info *domain =
1081                         list_entry(head->read_var1, typeof(*domain), list);
1082                 if (domain->is_deleted)
1083                         continue;
1084                 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1085                                         domain->domainname->name);
1086                 if (!done)
1087                         break;
1088         }
1089         head->read_eof = done;
1090 }
1091
1092 /**
1093  * tomoyo_write_pid: Specify PID to obtain domainname.
1094  *
1095  * @head: Pointer to "struct tomoyo_io_buffer".
1096  *
1097  * Returns 0.
1098  */
1099 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1100 {
1101         unsigned long pid;
1102         /* No error check. */
1103         strict_strtoul(head->write_buf, 10, &pid);
1104         head->read_step = (int) pid;
1105         head->read_eof = false;
1106         return 0;
1107 }
1108
1109 /**
1110  * tomoyo_read_pid - Get domainname of the specified PID.
1111  *
1112  * @head: Pointer to "struct tomoyo_io_buffer".
1113  *
1114  * Returns the domainname which the specified PID is in on success,
1115  * empty string otherwise.
1116  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1117  * using read()/write() interface rather than sysctl() interface.
1118  */
1119 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1120 {
1121         if (head->read_avail == 0 && !head->read_eof) {
1122                 const int pid = head->read_step;
1123                 struct task_struct *p;
1124                 struct tomoyo_domain_info *domain = NULL;
1125                 rcu_read_lock();
1126                 read_lock(&tasklist_lock);
1127                 p = find_task_by_vpid(pid);
1128                 if (p)
1129                         domain = tomoyo_real_domain(p);
1130                 read_unlock(&tasklist_lock);
1131                 rcu_read_unlock();
1132                 if (domain)
1133                         tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1134                                          domain->domainname->name);
1135                 head->read_eof = true;
1136         }
1137 }
1138
1139 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1140         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE]
1141         = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN,
1142         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]
1143         = TOMOYO_KEYWORD_INITIALIZE_DOMAIN,
1144         [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN,
1145         [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN
1146 };
1147
1148 /**
1149  * tomoyo_write_exception_policy - Write exception policy.
1150  *
1151  * @head: Pointer to "struct tomoyo_io_buffer".
1152  *
1153  * Returns 0 on success, negative value otherwise.
1154  *
1155  * Caller holds tomoyo_read_lock().
1156  */
1157 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1158 {
1159         char *data = head->write_buf;
1160         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1161         u8 i;
1162
1163         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) {
1164                 if (tomoyo_str_starts(&data, tomoyo_transition_type[i]))
1165                         return tomoyo_write_transition_control(data, is_delete,
1166                                                                i);
1167         }
1168         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
1169                 return tomoyo_write_aggregator_policy(data, is_delete);
1170         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1171                 return tomoyo_write_globally_readable_policy(data, is_delete);
1172         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1173                 return tomoyo_write_pattern_policy(data, is_delete);
1174         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1175                 return tomoyo_write_no_rewrite_policy(data, is_delete);
1176         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1177                 return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP);
1178         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1179                 return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP);
1180         return -EINVAL;
1181 }
1182
1183 static void tomoyo_print_number(char *buffer, int buffer_len,
1184                              const struct tomoyo_number_union *ptr)
1185 {
1186         int i;
1187         unsigned long min = ptr->values[0];
1188         const unsigned long max = ptr->values[1];
1189         u8 min_type = ptr->min_type;
1190         const u8 max_type = ptr->max_type;
1191         memset(buffer, 0, buffer_len);
1192         buffer_len -= 2;
1193         for (i = 0; i < 2; i++) {
1194                 int len;
1195                 switch (min_type) {
1196                 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
1197                         snprintf(buffer, buffer_len, "0x%lX", min);
1198                         break;
1199                 case TOMOYO_VALUE_TYPE_OCTAL:
1200                         snprintf(buffer, buffer_len, "0%lo", min);
1201                         break;
1202                 default:
1203                         snprintf(buffer, buffer_len, "%lu", min);
1204                         break;
1205                 }
1206                 if (min == max && min_type == max_type)
1207                         break;
1208                 len = strlen(buffer);
1209                 buffer[len++] = '-';
1210                 buffer += len;
1211                 buffer_len -= len;
1212                 min_type = max_type;
1213                 min = max;
1214         }
1215 }
1216
1217 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1218         [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP,
1219         [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP
1220 };
1221
1222 /**
1223  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1224  *
1225  * @head: Pointer to "struct tomoyo_io_buffer".
1226  * @idx:  Index number.
1227  *
1228  * Returns true on success, false otherwise.
1229  *
1230  * Caller holds tomoyo_read_lock().
1231  */
1232 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1233 {
1234         const char *w[3] = { "", "", "" };
1235         w[0] = tomoyo_group_name[idx];
1236         list_for_each_cookie(head->read_var1, &tomoyo_group_list[idx]) {
1237                 struct tomoyo_group *group =
1238                         list_entry(head->read_var1, typeof(*group), list);
1239                 w[1] = group->group_name->name;
1240                 list_for_each_cookie(head->read_var2, &group->member_list) {
1241                         char buffer[128];
1242                         struct tomoyo_acl_head *ptr =
1243                                 list_entry(head->read_var2, typeof(*ptr), list);
1244                         if (ptr->is_deleted)
1245                                 continue;
1246                         if (idx == TOMOYO_PATH_GROUP) {
1247                                 w[2] = container_of(ptr,
1248                                                     struct tomoyo_path_group,
1249                                                     head)->member_name->name;
1250                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1251                                 tomoyo_print_number(buffer, sizeof(buffer),
1252                                                     &container_of
1253                                                     (ptr, struct
1254                                                      tomoyo_number_group,
1255                                                      head)->number);
1256                                 w[2] = buffer;
1257                         }
1258                         if (!tomoyo_io_printf(head, "%s%s %s\n", w[0], w[1],
1259                                               w[2]))
1260                                 return false;
1261                 }
1262                 head->read_var2 = NULL;
1263         }
1264         head->read_var1 = NULL;
1265         return true;
1266 }
1267
1268 /**
1269  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1270  *
1271  * @head: Pointer to "struct tomoyo_io_buffer".
1272  * @idx:  Index number.
1273  *
1274  * Returns true on success, false otherwise.
1275  *
1276  * Caller holds tomoyo_read_lock().
1277  */
1278 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1279 {
1280         list_for_each_cookie(head->read_var2, &tomoyo_policy_list[idx]) {
1281                 const char *w[4] = { "", "", "", "" };
1282                 struct tomoyo_acl_head *acl =
1283                         container_of(head->read_var2, typeof(*acl), list);
1284                 if (acl->is_deleted)
1285                         continue;
1286                 switch (idx) {
1287                 case TOMOYO_ID_TRANSITION_CONTROL:
1288                         {
1289                                 struct tomoyo_transition_control *ptr =
1290                                         container_of(acl, typeof(*ptr), head);
1291                                 w[0] = tomoyo_transition_type[ptr->type];
1292                                 if (ptr->program)
1293                                         w[1] = ptr->program->name;
1294                                 if (ptr->domainname)
1295                                         w[3] = ptr->domainname->name;
1296                                 if (w[1][0] && w[3][0])
1297                                         w[2] = " from ";
1298                         }
1299                         break;
1300                 case TOMOYO_ID_GLOBALLY_READABLE:
1301                         {
1302                                 struct tomoyo_globally_readable_file_entry *ptr
1303                                         = container_of(acl, typeof(*ptr), head);
1304                                 w[0] = TOMOYO_KEYWORD_ALLOW_READ;
1305                                 w[1] = ptr->filename->name;
1306                         }
1307                         break;
1308                 case TOMOYO_ID_AGGREGATOR:
1309                         {
1310                                 struct tomoyo_aggregator_entry *ptr =
1311                                         container_of(acl, typeof(*ptr), head);
1312                                 w[0] = TOMOYO_KEYWORD_AGGREGATOR;
1313                                 w[1] = ptr->original_name->name;
1314                                 w[2] = " ";
1315                                 w[3] = ptr->aggregated_name->name;
1316                         }
1317                         break;
1318                 case TOMOYO_ID_PATTERN:
1319                         {
1320                                 struct tomoyo_pattern_entry *ptr =
1321                                         container_of(acl, typeof(*ptr), head);
1322                                 w[0] = TOMOYO_KEYWORD_FILE_PATTERN;
1323                                 w[1] = ptr->pattern->name;
1324                         }
1325                         break;
1326                 case TOMOYO_ID_NO_REWRITE:
1327                         {
1328                                 struct tomoyo_no_rewrite_entry *ptr =
1329                                         container_of(acl, typeof(*ptr), head);
1330                                 w[0] = TOMOYO_KEYWORD_DENY_REWRITE;
1331                                 w[1] = ptr->pattern->name;
1332                         }
1333                         break;
1334                 default:
1335                         continue;
1336                 }
1337                 if (!tomoyo_io_printf(head, "%s%s%s%s\n", w[0], w[1], w[2],
1338                                       w[3]))
1339                         return false;
1340         }
1341         head->read_var2 = NULL;
1342         return true;
1343 }
1344
1345 /**
1346  * tomoyo_read_exception_policy - Read exception policy.
1347  *
1348  * @head: Pointer to "struct tomoyo_io_buffer".
1349  *
1350  * Caller holds tomoyo_read_lock().
1351  */
1352 static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1353 {
1354         if (head->read_eof)
1355                 return;
1356         while (head->read_step < TOMOYO_MAX_POLICY &&
1357                tomoyo_read_policy(head, head->read_step))
1358                 head->read_step++;
1359         if (head->read_step < TOMOYO_MAX_POLICY)
1360                 return;
1361         while (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1362                tomoyo_read_group(head, head->read_step - TOMOYO_MAX_POLICY))
1363                 head->read_step++;
1364         if (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1365                 return;
1366         head->read_eof = true;
1367 }
1368
1369 /**
1370  * tomoyo_print_header - Get header line of audit log.
1371  *
1372  * @r: Pointer to "struct tomoyo_request_info".
1373  *
1374  * Returns string representation.
1375  *
1376  * This function uses kmalloc(), so caller must kfree() if this function
1377  * didn't return NULL.
1378  */
1379 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1380 {
1381         static const char *tomoyo_mode_4[4] = {
1382                 "disabled", "learning", "permissive", "enforcing"
1383         };
1384         struct timeval tv;
1385         const pid_t gpid = task_pid_nr(current);
1386         static const int tomoyo_buffer_len = 4096;
1387         char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1388         if (!buffer)
1389                 return NULL;
1390         do_gettimeofday(&tv);
1391         snprintf(buffer, tomoyo_buffer_len - 1,
1392                  "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1393                  " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1394                  " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1395                  tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid,
1396                  (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1397                  current_uid(), current_gid(), current_euid(),
1398                  current_egid(), current_suid(), current_sgid(),
1399                  current_fsuid(), current_fsgid());
1400         return buffer;
1401 }
1402
1403 /**
1404  * tomoyo_init_audit_log - Allocate buffer for audit logs.
1405  *
1406  * @len: Required size.
1407  * @r:   Pointer to "struct tomoyo_request_info".
1408  *
1409  * Returns pointer to allocated memory.
1410  *
1411  * The @len is updated to add the header lines' size on success.
1412  *
1413  * This function uses kzalloc(), so caller must kfree() if this function
1414  * didn't return NULL.
1415  */
1416 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1417 {
1418         char *buf = NULL;
1419         const char *header;
1420         const char *domainname;
1421         if (!r->domain)
1422                 r->domain = tomoyo_domain();
1423         domainname = r->domain->domainname->name;
1424         header = tomoyo_print_header(r);
1425         if (!header)
1426                 return NULL;
1427         *len += strlen(domainname) + strlen(header) + 10;
1428         buf = kzalloc(*len, GFP_NOFS);
1429         if (buf)
1430                 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1431         kfree(header);
1432         return buf;
1433 }
1434
1435 /* Wait queue for tomoyo_query_list. */
1436 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1437
1438 /* Lock for manipulating tomoyo_query_list. */
1439 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1440
1441 /* Structure for query. */
1442 struct tomoyo_query_entry {
1443         struct list_head list;
1444         char *query;
1445         int query_len;
1446         unsigned int serial;
1447         int timer;
1448         int answer;
1449 };
1450
1451 /* The list for "struct tomoyo_query_entry". */
1452 static LIST_HEAD(tomoyo_query_list);
1453
1454 /*
1455  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1456  * interface.
1457  */
1458 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1459
1460 /**
1461  * tomoyo_supervisor - Ask for the supervisor's decision.
1462  *
1463  * @r:       Pointer to "struct tomoyo_request_info".
1464  * @fmt:     The printf()'s format string, followed by parameters.
1465  *
1466  * Returns 0 if the supervisor decided to permit the access request which
1467  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1468  * supervisor decided to retry the access request which violated the policy in
1469  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1470  */
1471 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1472 {
1473         va_list args;
1474         int error = -EPERM;
1475         int pos;
1476         int len;
1477         static unsigned int tomoyo_serial;
1478         struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1479         bool quota_exceeded = false;
1480         char *header;
1481         switch (r->mode) {
1482                 char *buffer;
1483         case TOMOYO_CONFIG_LEARNING:
1484                 if (!tomoyo_domain_quota_is_ok(r))
1485                         return 0;
1486                 va_start(args, fmt);
1487                 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1488                 va_end(args);
1489                 buffer = kmalloc(len, GFP_NOFS);
1490                 if (!buffer)
1491                         return 0;
1492                 va_start(args, fmt);
1493                 vsnprintf(buffer, len - 1, fmt, args);
1494                 va_end(args);
1495                 tomoyo_normalize_line(buffer);
1496                 tomoyo_write_domain_policy2(buffer, r->domain, false);
1497                 kfree(buffer);
1498                 /* fall through */
1499         case TOMOYO_CONFIG_PERMISSIVE:
1500                 return 0;
1501         }
1502         if (!r->domain)
1503                 r->domain = tomoyo_domain();
1504         if (!atomic_read(&tomoyo_query_observers))
1505                 return -EPERM;
1506         va_start(args, fmt);
1507         len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1508         va_end(args);
1509         header = tomoyo_init_audit_log(&len, r);
1510         if (!header)
1511                 goto out;
1512         tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1513         if (!tomoyo_query_entry)
1514                 goto out;
1515         tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1516         if (!tomoyo_query_entry->query)
1517                 goto out;
1518         len = ksize(tomoyo_query_entry->query);
1519         INIT_LIST_HEAD(&tomoyo_query_entry->list);
1520         spin_lock(&tomoyo_query_list_lock);
1521         if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1522             sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1523                 quota_exceeded = true;
1524         } else {
1525                 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1526                 tomoyo_query_entry->serial = tomoyo_serial++;
1527         }
1528         spin_unlock(&tomoyo_query_list_lock);
1529         if (quota_exceeded)
1530                 goto out;
1531         pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1532                        tomoyo_query_entry->serial, r->retry, header);
1533         kfree(header);
1534         header = NULL;
1535         va_start(args, fmt);
1536         vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1537         tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1538         va_end(args);
1539         spin_lock(&tomoyo_query_list_lock);
1540         list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1541         spin_unlock(&tomoyo_query_list_lock);
1542         /* Give 10 seconds for supervisor's opinion. */
1543         for (tomoyo_query_entry->timer = 0;
1544              atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1545              tomoyo_query_entry->timer++) {
1546                 wake_up(&tomoyo_query_wait);
1547                 set_current_state(TASK_INTERRUPTIBLE);
1548                 schedule_timeout(HZ / 10);
1549                 if (tomoyo_query_entry->answer)
1550                         break;
1551         }
1552         spin_lock(&tomoyo_query_list_lock);
1553         list_del(&tomoyo_query_entry->list);
1554         tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1555         spin_unlock(&tomoyo_query_list_lock);
1556         switch (tomoyo_query_entry->answer) {
1557         case 3: /* Asked to retry by administrator. */
1558                 error = TOMOYO_RETRY_REQUEST;
1559                 r->retry++;
1560                 break;
1561         case 1:
1562                 /* Granted by administrator. */
1563                 error = 0;
1564                 break;
1565         case 0:
1566                 /* Timed out. */
1567                 break;
1568         default:
1569                 /* Rejected by administrator. */
1570                 break;
1571         }
1572  out:
1573         if (tomoyo_query_entry)
1574                 kfree(tomoyo_query_entry->query);
1575         kfree(tomoyo_query_entry);
1576         kfree(header);
1577         return error;
1578 }
1579
1580 /**
1581  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1582  *
1583  * @file: Pointer to "struct file".
1584  * @wait: Pointer to "poll_table".
1585  *
1586  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1587  *
1588  * Waits for access requests which violated policy in enforcing mode.
1589  */
1590 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1591 {
1592         struct list_head *tmp;
1593         bool found = false;
1594         u8 i;
1595         for (i = 0; i < 2; i++) {
1596                 spin_lock(&tomoyo_query_list_lock);
1597                 list_for_each(tmp, &tomoyo_query_list) {
1598                         struct tomoyo_query_entry *ptr
1599                                 = list_entry(tmp, struct tomoyo_query_entry,
1600                                              list);
1601                         if (ptr->answer)
1602                                 continue;
1603                         found = true;
1604                         break;
1605                 }
1606                 spin_unlock(&tomoyo_query_list_lock);
1607                 if (found)
1608                         return POLLIN | POLLRDNORM;
1609                 if (i)
1610                         break;
1611                 poll_wait(file, &tomoyo_query_wait, wait);
1612         }
1613         return 0;
1614 }
1615
1616 /**
1617  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1618  *
1619  * @head: Pointer to "struct tomoyo_io_buffer".
1620  */
1621 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1622 {
1623         struct list_head *tmp;
1624         int pos = 0;
1625         int len = 0;
1626         char *buf;
1627         if (head->read_avail)
1628                 return;
1629         if (head->read_buf) {
1630                 kfree(head->read_buf);
1631                 head->read_buf = NULL;
1632                 head->readbuf_size = 0;
1633         }
1634         spin_lock(&tomoyo_query_list_lock);
1635         list_for_each(tmp, &tomoyo_query_list) {
1636                 struct tomoyo_query_entry *ptr
1637                         = list_entry(tmp, struct tomoyo_query_entry, list);
1638                 if (ptr->answer)
1639                         continue;
1640                 if (pos++ != head->read_step)
1641                         continue;
1642                 len = ptr->query_len;
1643                 break;
1644         }
1645         spin_unlock(&tomoyo_query_list_lock);
1646         if (!len) {
1647                 head->read_step = 0;
1648                 return;
1649         }
1650         buf = kzalloc(len, GFP_NOFS);
1651         if (!buf)
1652                 return;
1653         pos = 0;
1654         spin_lock(&tomoyo_query_list_lock);
1655         list_for_each(tmp, &tomoyo_query_list) {
1656                 struct tomoyo_query_entry *ptr
1657                         = list_entry(tmp, struct tomoyo_query_entry, list);
1658                 if (ptr->answer)
1659                         continue;
1660                 if (pos++ != head->read_step)
1661                         continue;
1662                 /*
1663                  * Some query can be skipped because tomoyo_query_list
1664                  * can change, but I don't care.
1665                  */
1666                 if (len == ptr->query_len)
1667                         memmove(buf, ptr->query, len);
1668                 break;
1669         }
1670         spin_unlock(&tomoyo_query_list_lock);
1671         if (buf[0]) {
1672                 head->read_avail = len;
1673                 head->readbuf_size = head->read_avail;
1674                 head->read_buf = buf;
1675                 head->read_step++;
1676         } else {
1677                 kfree(buf);
1678         }
1679 }
1680
1681 /**
1682  * tomoyo_write_answer - Write the supervisor's decision.
1683  *
1684  * @head: Pointer to "struct tomoyo_io_buffer".
1685  *
1686  * Returns 0 on success, -EINVAL otherwise.
1687  */
1688 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1689 {
1690         char *data = head->write_buf;
1691         struct list_head *tmp;
1692         unsigned int serial;
1693         unsigned int answer;
1694         spin_lock(&tomoyo_query_list_lock);
1695         list_for_each(tmp, &tomoyo_query_list) {
1696                 struct tomoyo_query_entry *ptr
1697                         = list_entry(tmp, struct tomoyo_query_entry, list);
1698                 ptr->timer = 0;
1699         }
1700         spin_unlock(&tomoyo_query_list_lock);
1701         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1702                 return -EINVAL;
1703         spin_lock(&tomoyo_query_list_lock);
1704         list_for_each(tmp, &tomoyo_query_list) {
1705                 struct tomoyo_query_entry *ptr
1706                         = list_entry(tmp, struct tomoyo_query_entry, list);
1707                 if (ptr->serial != serial)
1708                         continue;
1709                 if (!ptr->answer)
1710                         ptr->answer = answer;
1711                 break;
1712         }
1713         spin_unlock(&tomoyo_query_list_lock);
1714         return 0;
1715 }
1716
1717 /**
1718  * tomoyo_read_version: Get version.
1719  *
1720  * @head: Pointer to "struct tomoyo_io_buffer".
1721  *
1722  * Returns version information.
1723  */
1724 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1725 {
1726         if (!head->read_eof) {
1727                 tomoyo_io_printf(head, "2.3.0-pre");
1728                 head->read_eof = true;
1729         }
1730 }
1731
1732 /**
1733  * tomoyo_read_self_domain - Get the current process's domainname.
1734  *
1735  * @head: Pointer to "struct tomoyo_io_buffer".
1736  *
1737  * Returns the current process's domainname.
1738  */
1739 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1740 {
1741         if (!head->read_eof) {
1742                 /*
1743                  * tomoyo_domain()->domainname != NULL
1744                  * because every process belongs to a domain and
1745                  * the domain's name cannot be NULL.
1746                  */
1747                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1748                 head->read_eof = true;
1749         }
1750 }
1751
1752 /**
1753  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1754  *
1755  * @type: Type of interface.
1756  * @file: Pointer to "struct file".
1757  *
1758  * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1759  *
1760  * Caller acquires tomoyo_read_lock().
1761  */
1762 int tomoyo_open_control(const u8 type, struct file *file)
1763 {
1764         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1765
1766         if (!head)
1767                 return -ENOMEM;
1768         mutex_init(&head->io_sem);
1769         head->type = type;
1770         switch (type) {
1771         case TOMOYO_DOMAINPOLICY:
1772                 /* /sys/kernel/security/tomoyo/domain_policy */
1773                 head->write = tomoyo_write_domain_policy;
1774                 head->read = tomoyo_read_domain_policy;
1775                 break;
1776         case TOMOYO_EXCEPTIONPOLICY:
1777                 /* /sys/kernel/security/tomoyo/exception_policy */
1778                 head->write = tomoyo_write_exception_policy;
1779                 head->read = tomoyo_read_exception_policy;
1780                 break;
1781         case TOMOYO_SELFDOMAIN:
1782                 /* /sys/kernel/security/tomoyo/self_domain */
1783                 head->read = tomoyo_read_self_domain;
1784                 break;
1785         case TOMOYO_DOMAIN_STATUS:
1786                 /* /sys/kernel/security/tomoyo/.domain_status */
1787                 head->write = tomoyo_write_domain_profile;
1788                 head->read = tomoyo_read_domain_profile;
1789                 break;
1790         case TOMOYO_PROCESS_STATUS:
1791                 /* /sys/kernel/security/tomoyo/.process_status */
1792                 head->write = tomoyo_write_pid;
1793                 head->read = tomoyo_read_pid;
1794                 break;
1795         case TOMOYO_VERSION:
1796                 /* /sys/kernel/security/tomoyo/version */
1797                 head->read = tomoyo_read_version;
1798                 head->readbuf_size = 128;
1799                 break;
1800         case TOMOYO_MEMINFO:
1801                 /* /sys/kernel/security/tomoyo/meminfo */
1802                 head->write = tomoyo_write_memory_quota;
1803                 head->read = tomoyo_read_memory_counter;
1804                 head->readbuf_size = 512;
1805                 break;
1806         case TOMOYO_PROFILE:
1807                 /* /sys/kernel/security/tomoyo/profile */
1808                 head->write = tomoyo_write_profile;
1809                 head->read = tomoyo_read_profile;
1810                 break;
1811         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1812                 head->poll = tomoyo_poll_query;
1813                 head->write = tomoyo_write_answer;
1814                 head->read = tomoyo_read_query;
1815                 break;
1816         case TOMOYO_MANAGER:
1817                 /* /sys/kernel/security/tomoyo/manager */
1818                 head->write = tomoyo_write_manager_policy;
1819                 head->read = tomoyo_read_manager_policy;
1820                 break;
1821         }
1822         if (!(file->f_mode & FMODE_READ)) {
1823                 /*
1824                  * No need to allocate read_buf since it is not opened
1825                  * for reading.
1826                  */
1827                 head->read = NULL;
1828                 head->poll = NULL;
1829         } else if (!head->poll) {
1830                 /* Don't allocate read_buf for poll() access. */
1831                 if (!head->readbuf_size)
1832                         head->readbuf_size = 4096 * 2;
1833                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1834                 if (!head->read_buf) {
1835                         kfree(head);
1836                         return -ENOMEM;
1837                 }
1838         }
1839         if (!(file->f_mode & FMODE_WRITE)) {
1840                 /*
1841                  * No need to allocate write_buf since it is not opened
1842                  * for writing.
1843                  */
1844                 head->write = NULL;
1845         } else if (head->write) {
1846                 head->writebuf_size = 4096 * 2;
1847                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1848                 if (!head->write_buf) {
1849                         kfree(head->read_buf);
1850                         kfree(head);
1851                         return -ENOMEM;
1852                 }
1853         }
1854         if (type != TOMOYO_QUERY)
1855                 head->reader_idx = tomoyo_read_lock();
1856         file->private_data = head;
1857         /*
1858          * Call the handler now if the file is
1859          * /sys/kernel/security/tomoyo/self_domain
1860          * so that the user can use
1861          * cat < /sys/kernel/security/tomoyo/self_domain"
1862          * to know the current process's domainname.
1863          */
1864         if (type == TOMOYO_SELFDOMAIN)
1865                 tomoyo_read_control(file, NULL, 0);
1866         /*
1867          * If the file is /sys/kernel/security/tomoyo/query , increment the
1868          * observer counter.
1869          * The obserber counter is used by tomoyo_supervisor() to see if
1870          * there is some process monitoring /sys/kernel/security/tomoyo/query.
1871          */
1872         else if (type == TOMOYO_QUERY)
1873                 atomic_inc(&tomoyo_query_observers);
1874         return 0;
1875 }
1876
1877 /**
1878  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1879  *
1880  * @file: Pointer to "struct file".
1881  * @wait: Pointer to "poll_table".
1882  *
1883  * Waits for read readiness.
1884  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1885  */
1886 int tomoyo_poll_control(struct file *file, poll_table *wait)
1887 {
1888         struct tomoyo_io_buffer *head = file->private_data;
1889         if (!head->poll)
1890                 return -ENOSYS;
1891         return head->poll(file, wait);
1892 }
1893
1894 /**
1895  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1896  *
1897  * @file:       Pointer to "struct file".
1898  * @buffer:     Poiner to buffer to write to.
1899  * @buffer_len: Size of @buffer.
1900  *
1901  * Returns bytes read on success, negative value otherwise.
1902  *
1903  * Caller holds tomoyo_read_lock().
1904  */
1905 int tomoyo_read_control(struct file *file, char __user *buffer,
1906                         const int buffer_len)
1907 {
1908         int len = 0;
1909         struct tomoyo_io_buffer *head = file->private_data;
1910         char *cp;
1911
1912         if (!head->read)
1913                 return -ENOSYS;
1914         if (mutex_lock_interruptible(&head->io_sem))
1915                 return -EINTR;
1916         /* Call the policy handler. */
1917         head->read(head);
1918         if (len < 0)
1919                 goto out;
1920         /* Write to buffer. */
1921         len = head->read_avail;
1922         if (len > buffer_len)
1923                 len = buffer_len;
1924         if (!len)
1925                 goto out;
1926         /* head->read_buf changes by some functions. */
1927         cp = head->read_buf;
1928         if (copy_to_user(buffer, cp, len)) {
1929                 len = -EFAULT;
1930                 goto out;
1931         }
1932         head->read_avail -= len;
1933         memmove(cp, cp + len, head->read_avail);
1934  out:
1935         mutex_unlock(&head->io_sem);
1936         return len;
1937 }
1938
1939 /**
1940  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1941  *
1942  * @file:       Pointer to "struct file".
1943  * @buffer:     Pointer to buffer to read from.
1944  * @buffer_len: Size of @buffer.
1945  *
1946  * Returns @buffer_len on success, negative value otherwise.
1947  *
1948  * Caller holds tomoyo_read_lock().
1949  */
1950 int tomoyo_write_control(struct file *file, const char __user *buffer,
1951                          const int buffer_len)
1952 {
1953         struct tomoyo_io_buffer *head = file->private_data;
1954         int error = buffer_len;
1955         int avail_len = buffer_len;
1956         char *cp0 = head->write_buf;
1957
1958         if (!head->write)
1959                 return -ENOSYS;
1960         if (!access_ok(VERIFY_READ, buffer, buffer_len))
1961                 return -EFAULT;
1962         /* Don't allow updating policies by non manager programs. */
1963         if (head->write != tomoyo_write_pid &&
1964             head->write != tomoyo_write_domain_policy &&
1965             !tomoyo_policy_manager())
1966                 return -EPERM;
1967         if (mutex_lock_interruptible(&head->io_sem))
1968                 return -EINTR;
1969         /* Read a line and dispatch it to the policy handler. */
1970         while (avail_len > 0) {
1971                 char c;
1972                 if (head->write_avail >= head->writebuf_size - 1) {
1973                         error = -ENOMEM;
1974                         break;
1975                 } else if (get_user(c, buffer)) {
1976                         error = -EFAULT;
1977                         break;
1978                 }
1979                 buffer++;
1980                 avail_len--;
1981                 cp0[head->write_avail++] = c;
1982                 if (c != '\n')
1983                         continue;
1984                 cp0[head->write_avail - 1] = '\0';
1985                 head->write_avail = 0;
1986                 tomoyo_normalize_line(cp0);
1987                 head->write(head);
1988         }
1989         mutex_unlock(&head->io_sem);
1990         return error;
1991 }
1992
1993 /**
1994  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1995  *
1996  * @file: Pointer to "struct file".
1997  *
1998  * Releases memory and returns 0.
1999  *
2000  * Caller looses tomoyo_read_lock().
2001  */
2002 int tomoyo_close_control(struct file *file)
2003 {
2004         struct tomoyo_io_buffer *head = file->private_data;
2005         const bool is_write = !!head->write_buf;
2006
2007         /*
2008          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2009          * observer counter.
2010          */
2011         if (head->type == TOMOYO_QUERY)
2012                 atomic_dec(&tomoyo_query_observers);
2013         else
2014                 tomoyo_read_unlock(head->reader_idx);
2015         /* Release memory used for policy I/O. */
2016         kfree(head->read_buf);
2017         head->read_buf = NULL;
2018         kfree(head->write_buf);
2019         head->write_buf = NULL;
2020         kfree(head);
2021         head = NULL;
2022         file->private_data = NULL;
2023         if (is_write)
2024                 tomoyo_run_gc();
2025         return 0;
2026 }
2027
2028 /**
2029  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2030  */
2031 void tomoyo_check_profile(void)
2032 {
2033         struct tomoyo_domain_info *domain;
2034         const int idx = tomoyo_read_lock();
2035         tomoyo_policy_loaded = true;
2036         /* Check all profiles currently assigned to domains are defined. */
2037         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2038                 const u8 profile = domain->profile;
2039                 if (tomoyo_profile_ptr[profile])
2040                         continue;
2041                 panic("Profile %u (used by '%s') not defined.\n",
2042                       profile, domain->domainname->name);
2043         }
2044         tomoyo_read_unlock(idx);
2045         if (tomoyo_profile_version != 20090903)
2046                 panic("Profile version %u is not supported.\n",
2047                       tomoyo_profile_version);
2048         printk(KERN_INFO "TOMOYO: 2.3.0-pre   2010/06/03\n");
2049         printk(KERN_INFO "Mandatory Access Control activated.\n");
2050 }