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 (!strcmp(data, "allow_execute")) {
 598                 head->print_execute_only = true;
 599                 return true;
 600         }
 601         if (sscanf(data, "pid=%u", &pid) == 1 ||
 602             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 603                 struct task_struct *p;
 604                 rcu_read_lock();
 605                 read_lock(&tasklist_lock);
 606                 if (global_pid)
 607                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 608                 else
 609                         p = find_task_by_vpid(pid);
 610                 if (p)
 611                         domain = tomoyo_real_domain(p);
 612                 read_unlock(&tasklist_lock);
 613                 rcu_read_unlock();
 614         } else if (!strncmp(data, "domain=", 7)) {
 615                 if (tomoyo_domain_def(data + 7))
 616                         domain = tomoyo_find_domain(data + 7);
 617         } else
 618                 return false;
 619         head->write_var1 = domain;
 620         /* Accessing read_buf is safe because head->io_sem is held. */
 621         if (!head->read_buf)
 622                 return true; /* Do nothing if open(O_WRONLY). */
 623         head->read_avail = 0;
 624         tomoyo_io_printf(head, "# select %s\n", data);
 625         head->read_single_domain = true;
 626         head->read_eof = !domain;
 627         head->read_var1 = &domain->list;
 628         head->read_var2 = NULL;
 629         head->read_bit = 0;
 630         head->read_step = 0;
 631         if (domain && domain->is_deleted)
 632                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 633         return true;
 634 }
 635
 636 /**
 637  * tomoyo_delete_domain - Delete a domain.
 638  *
 639  * @domainname: The name of domain.
 640  *
 641  * Returns 0.
 642  *
 643  * Caller holds tomoyo_read_lock().
 644  */
 645 static int tomoyo_delete_domain(char *domainname)
 646 {
 647         struct tomoyo_domain_info *domain;
 648         struct tomoyo_path_info name;
 649
 650         name.name = domainname;
 651         tomoyo_fill_path_info(&name);
 652         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 653                 return 0;
 654         /* Is there an active domain? */
 655         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 656                 /* Never delete tomoyo_kernel_domain */
 657                 if (domain == &tomoyo_kernel_domain)
 658                         continue;
 659                 if (domain->is_deleted ||
 660                     tomoyo_pathcmp(domain->domainname, &name))
 661                         continue;
 662                 domain->is_deleted = true;
 663                 break;
 664         }
 665         mutex_unlock(&tomoyo_policy_lock);
 666         return 0;
 667 }
 668
 669 /**
 670  * tomoyo_write_domain_policy2 - Write domain policy.
 671  *
 672  * @head: Pointer to "struct tomoyo_io_buffer".
 673  *
 674  * Returns 0 on success, negative value otherwise.
 675  *
 676  * Caller holds tomoyo_read_lock().
 677  */
 678 static int tomoyo_write_domain_policy2(char *data,
 679                                        struct tomoyo_domain_info *domain,
 680                                        const bool is_delete)
 681 {
 682         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
 683                 return tomoyo_write_mount_policy(data, domain, is_delete);
 684         return tomoyo_write_file_policy(data, domain, is_delete);
 685 }
 686
 687 /**
 688  * tomoyo_write_domain_policy - Write domain policy.
 689  *
 690  * @head: Pointer to "struct tomoyo_io_buffer".
 691  *
 692  * Returns 0 on success, negative value otherwise.
 693  *
 694  * Caller holds tomoyo_read_lock().
 695  */
 696 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
 697 {
 698         char *data = head->write_buf;
 699         struct tomoyo_domain_info *domain = head->write_var1;
 700         bool is_delete = false;
 701         bool is_select = false;
 702         unsigned int profile;
 703
 704         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
 705                 is_delete = true;
 706         else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
 707                 is_select = true;
 708         if (is_select && tomoyo_select_one(head, data))
 709                 return 0;
 710         /* Don't allow updating policies by non manager programs. */
 711         if (!tomoyo_policy_manager())
 712                 return -EPERM;
 713         if (tomoyo_domain_def(data)) {
 714                 domain = NULL;
 715                 if (is_delete)
 716                         tomoyo_delete_domain(data);
 717                 else if (is_select)
 718                         domain = tomoyo_find_domain(data);
 719                 else
 720                         domain = tomoyo_find_or_assign_new_domain(data, 0);
 721                 head->write_var1 = domain;
 722                 return 0;
 723         }
 724         if (!domain)
 725                 return -EINVAL;
 726
 727         if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
 728             && profile < TOMOYO_MAX_PROFILES) {
 729                 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
 730                         domain->profile = (u8) profile;
 731                 return 0;
 732         }
 733         if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
 734                 domain->ignore_global_allow_read = !is_delete;
 735                 return 0;
 736         }
 737         if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
 738                 domain->quota_warned = !is_delete;
 739                 return 0;
 740         }
 741         if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
 742                 domain->transition_failed = !is_delete;
 743                 return 0;
 744         }
 745         return tomoyo_write_domain_policy2(data, domain, is_delete);
 746 }
 747
 748 /**
 749  * tomoyo_print_path_acl - Print a single path ACL entry.
 750  *
 751  * @head: Pointer to "struct tomoyo_io_buffer".
 752  * @ptr:  Pointer to "struct tomoyo_path_acl".
 753  *
 754  * Returns true on success, false otherwise.
 755  */
 756 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
 757                                   struct tomoyo_path_acl *ptr)
 758 {
 759         int pos;
 760         u8 bit;
 761         const u16 perm = ptr->perm;
 762
 763         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
 764                 if (!(perm & (1 << bit)))
 765                         continue;
 766                 if (head->print_execute_only && bit != TOMOYO_TYPE_EXECUTE)
 767                         continue;
 768                 /* Print "read/write" instead of "read" and "write". */
 769                 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
 770                     && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
 771                         continue;
 772                 pos = head->read_avail;
 773                 if (!tomoyo_io_printf(head, "allow_%s ",
 774                                       tomoyo_path_keyword[bit]) ||
 775                     !tomoyo_print_name_union(head, &ptr->name) ||
 776                     !tomoyo_io_printf(head, "\n"))
 777                         goto out;
 778         }
 779         head->read_bit = 0;
 780         return true;
 781  out:
 782         head->read_bit = bit;
 783         head->read_avail = pos;
 784         return false;
 785 }
 786
 787 /**
 788  * tomoyo_print_path2_acl - Print a double path ACL entry.
 789  *
 790  * @head: Pointer to "struct tomoyo_io_buffer".
 791  * @ptr:  Pointer to "struct tomoyo_path2_acl".
 792  *
 793  * Returns true on success, false otherwise.
 794  */
 795 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
 796                                    struct tomoyo_path2_acl *ptr)
 797 {
 798         int pos;
 799         const u8 perm = ptr->perm;
 800         u8 bit;
 801
 802         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
 803                 if (!(perm & (1 << bit)))
 804                         continue;
 805                 pos = head->read_avail;
 806                 if (!tomoyo_io_printf(head, "allow_%s ",
 807                                       tomoyo_path2_keyword[bit]) ||
 808                     !tomoyo_print_name_union(head, &ptr->name1) ||
 809                     !tomoyo_print_name_union(head, &ptr->name2) ||
 810                     !tomoyo_io_printf(head, "\n"))
 811                         goto out;
 812         }
 813         head->read_bit = 0;
 814         return true;
 815  out:
 816         head->read_bit = bit;
 817         head->read_avail = pos;
 818         return false;
 819 }
 820
 821 /**
 822  * tomoyo_print_path_number_acl - Print a path_number ACL entry.
 823  *
 824  * @head: Pointer to "struct tomoyo_io_buffer".
 825  * @ptr:  Pointer to "struct tomoyo_path_number_acl".
 826  *
 827  * Returns true on success, false otherwise.
 828  */
 829 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
 830                                          struct tomoyo_path_number_acl *ptr)
 831 {
 832         int pos;
 833         u8 bit;
 834         const u8 perm = ptr->perm;
 835         for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
 836              bit++) {
 837                 if (!(perm & (1 << bit)))
 838                         continue;
 839                 pos = head->read_avail;
 840                 if (!tomoyo_io_printf(head, "allow_%s",
 841                                       tomoyo_path_number_keyword[bit]) ||
 842                     !tomoyo_print_name_union(head, &ptr->name) ||
 843                     !tomoyo_print_number_union(head, &ptr->number) ||
 844                     !tomoyo_io_printf(head, "\n"))
 845                         goto out;
 846         }
 847         head->read_bit = 0;
 848         return true;
 849  out:
 850         head->read_bit = bit;
 851         head->read_avail = pos;
 852         return false;
 853 }
 854
 855 /**
 856  * tomoyo_print_mkdev_acl - Print a mkdev ACL entry.
 857  *
 858  * @head: Pointer to "struct tomoyo_io_buffer".
 859  * @ptr:  Pointer to "struct tomoyo_mkdev_acl".
 860  *
 861  * Returns true on success, false otherwise.
 862  */
 863 static bool tomoyo_print_mkdev_acl(struct tomoyo_io_buffer *head,
 864                                           struct tomoyo_mkdev_acl *ptr)
 865 {
 866         int pos;
 867         u8 bit;
 868         const u16 perm = ptr->perm;
 869         for (bit = head->read_bit; bit < TOMOYO_MAX_MKDEV_OPERATION;
 870              bit++) {
 871                 if (!(perm & (1 << bit)))
 872                         continue;
 873                 pos = head->read_avail;
 874                 if (!tomoyo_io_printf(head, "allow_%s",
 875                                       tomoyo_mkdev_keyword[bit]) ||
 876                     !tomoyo_print_name_union(head, &ptr->name) ||
 877                     !tomoyo_print_number_union(head, &ptr->mode) ||
 878                     !tomoyo_print_number_union(head, &ptr->major) ||
 879                     !tomoyo_print_number_union(head, &ptr->minor) ||
 880                     !tomoyo_io_printf(head, "\n"))
 881                         goto out;
 882         }
 883         head->read_bit = 0;
 884         return true;
 885  out:
 886         head->read_bit = bit;
 887         head->read_avail = pos;
 888         return false;
 889 }
 890
 891 /**
 892  * tomoyo_print_mount_acl - Print a mount ACL entry.
 893  *
 894  * @head: Pointer to "struct tomoyo_io_buffer".
 895  * @ptr:  Pointer to "struct tomoyo_mount_acl".
 896  *
 897  * Returns true on success, false otherwise.
 898  */
 899 static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
 900                                    struct tomoyo_mount_acl *ptr)
 901 {
 902         const int pos = head->read_avail;
 903         if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) ||
 904             !tomoyo_print_name_union(head, &ptr->dev_name) ||
 905             !tomoyo_print_name_union(head, &ptr->dir_name) ||
 906             !tomoyo_print_name_union(head, &ptr->fs_type) ||
 907             !tomoyo_print_number_union(head, &ptr->flags) ||
 908             !tomoyo_io_printf(head, "\n")) {
 909                 head->read_avail = pos;
 910                 return false;
 911         }
 912         return true;
 913 }
 914
 915 /**
 916  * tomoyo_print_entry - Print an ACL entry.
 917  *
 918  * @head: Pointer to "struct tomoyo_io_buffer".
 919  * @ptr:  Pointer to an ACL entry.
 920  *
 921  * Returns true on success, false otherwise.
 922  */
 923 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
 924                                struct tomoyo_acl_info *ptr)
 925 {
 926         const u8 acl_type = ptr->type;
 927
 928         if (ptr->is_deleted)
 929                 return true;
 930         if (acl_type == TOMOYO_TYPE_PATH_ACL) {
 931                 struct tomoyo_path_acl *acl
 932                         = container_of(ptr, struct tomoyo_path_acl, head);
 933                 return tomoyo_print_path_acl(head, acl);
 934         }
 935         if (head->print_execute_only)
 936                 return true;
 937         if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
 938                 struct tomoyo_path2_acl *acl
 939                         = container_of(ptr, struct tomoyo_path2_acl, head);
 940                 return tomoyo_print_path2_acl(head, acl);
 941         }
 942         if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
 943                 struct tomoyo_path_number_acl *acl
 944                         = container_of(ptr, struct tomoyo_path_number_acl,
 945                                        head);
 946                 return tomoyo_print_path_number_acl(head, acl);
 947         }
 948         if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
 949                 struct tomoyo_mkdev_acl *acl
 950                         = container_of(ptr, struct tomoyo_mkdev_acl,
 951                                        head);
 952                 return tomoyo_print_mkdev_acl(head, acl);
 953         }
 954         if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
 955                 struct tomoyo_mount_acl *acl
 956                         = container_of(ptr, struct tomoyo_mount_acl, head);
 957                 return tomoyo_print_mount_acl(head, acl);
 958         }
 959         BUG(); /* This must not happen. */
 960         return false;
 961 }
 962
 963 /**
 964  * tomoyo_read_domain_policy - Read domain policy.
 965  *
 966  * @head: Pointer to "struct tomoyo_io_buffer".
 967  *
 968  * Caller holds tomoyo_read_lock().
 969  */
 970 static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
 971 {
 972         bool done = true;
 973
 974         if (head->read_eof)
 975                 return;
 976         if (head->read_step == 0)
 977                 head->read_step = 1;
 978         list_for_each_cookie(head->read_var1, &tomoyo_domain_list) {
 979                 struct tomoyo_domain_info *domain =
 980                         list_entry(head->read_var1, typeof(*domain), list);
 981                 const char *quota_exceeded = "";
 982                 const char *transition_failed = "";
 983                 const char *ignore_global_allow_read = "";
 984                 if (head->read_step != 1)
 985                         goto acl_loop;
 986                 if (domain->is_deleted && !head->read_single_domain)
 987                         continue;
 988                 /* Print domainname and flags. */
 989                 if (domain->quota_warned)
 990                         quota_exceeded = "quota_exceeded\n";
 991                 if (domain->transition_failed)
 992                         transition_failed = "transition_failed\n";
 993                 if (domain->ignore_global_allow_read)
 994                         ignore_global_allow_read
 995                                 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
 996                 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
 997                                         "%u\n%s%s%s\n",
 998                                         domain->domainname->name,
 999                                         domain->profile, quota_exceeded,
1000                                         transition_failed,
1001                                         ignore_global_allow_read);
1002                 if (!done)
1003                         break;
1004                 head->read_step = 2;
1005 acl_loop:
1006                 if (head->read_step == 3)
1007                         goto tail_mark;
1008                 /* Print ACL entries in the domain. */
1009                 list_for_each_cookie(head->read_var2,
1010                                      &domain->acl_info_list) {
1011                         struct tomoyo_acl_info *ptr =
1012                                 list_entry(head->read_var2, typeof(*ptr), list);
1013                         done = tomoyo_print_entry(head, ptr);
1014                         if (!done)
1015                                 break;
1016                 }
1017                 if (!done)
1018                         break;
1019                 head->read_var2 = NULL;
1020                 head->read_step = 3;
1021 tail_mark:
1022                 done = tomoyo_io_printf(head, "\n");
1023                 if (!done)
1024                         break;
1025                 head->read_step = 1;
1026                 if (head->read_single_domain)
1027                         break;
1028         }
1029         head->read_eof = done;
1030 }
1031
1032 /**
1033  * tomoyo_write_domain_profile - Assign profile for specified domain.
1034  *
1035  * @head: Pointer to "struct tomoyo_io_buffer".
1036  *
1037  * Returns 0 on success, -EINVAL otherwise.
1038  *
1039  * This is equivalent to doing
1040  *
1041  *     ( echo "select " $domainname; echo "use_profile " $profile ) |
1042  *     /usr/sbin/tomoyo-loadpolicy -d
1043  *
1044  * Caller holds tomoyo_read_lock().
1045  */
1046 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1047 {
1048         char *data = head->write_buf;
1049         char *cp = strchr(data, ' ');
1050         struct tomoyo_domain_info *domain;
1051         unsigned long profile;
1052
1053         if (!cp)
1054                 return -EINVAL;
1055         *cp = '\0';
1056         domain = tomoyo_find_domain(cp + 1);
1057         if (strict_strtoul(data, 10, &profile))
1058                 return -EINVAL;
1059         if (domain && profile < TOMOYO_MAX_PROFILES
1060             && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1061                 domain->profile = (u8) profile;
1062         return 0;
1063 }
1064
1065 /**
1066  * tomoyo_read_domain_profile - Read only domainname and profile.
1067  *
1068  * @head: Pointer to "struct tomoyo_io_buffer".
1069  *
1070  * Returns list of profile number and domainname pairs.
1071  *
1072  * This is equivalent to doing
1073  *
1074  *     grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1075  *     awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1076  *     domainname = $0; } else if ( $1 == "use_profile" ) {
1077  *     print $2 " " domainname; domainname = ""; } } ; '
1078  *
1079  * Caller holds tomoyo_read_lock().
1080  */
1081 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1082 {
1083         bool done = true;
1084
1085         if (head->read_eof)
1086                 return;
1087         list_for_each_cookie(head->read_var1, &tomoyo_domain_list) {
1088                 struct tomoyo_domain_info *domain =
1089                         list_entry(head->read_var1, typeof(*domain), list);
1090                 if (domain->is_deleted)
1091                         continue;
1092                 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1093                                         domain->domainname->name);
1094                 if (!done)
1095                         break;
1096         }
1097         head->read_eof = done;
1098 }
1099
1100 /**
1101  * tomoyo_write_pid: Specify PID to obtain domainname.
1102  *
1103  * @head: Pointer to "struct tomoyo_io_buffer".
1104  *
1105  * Returns 0.
1106  */
1107 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1108 {
1109         unsigned long pid;
1110         /* No error check. */
1111         strict_strtoul(head->write_buf, 10, &pid);
1112         head->read_step = (int) pid;
1113         head->read_eof = false;
1114         return 0;
1115 }
1116
1117 /**
1118  * tomoyo_read_pid - Get domainname of the specified PID.
1119  *
1120  * @head: Pointer to "struct tomoyo_io_buffer".
1121  *
1122  * Returns the domainname which the specified PID is in on success,
1123  * empty string otherwise.
1124  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1125  * using read()/write() interface rather than sysctl() interface.
1126  */
1127 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1128 {
1129         if (head->read_avail == 0 && !head->read_eof) {
1130                 const int pid = head->read_step;
1131                 struct task_struct *p;
1132                 struct tomoyo_domain_info *domain = NULL;
1133                 rcu_read_lock();
1134                 read_lock(&tasklist_lock);
1135                 p = find_task_by_vpid(pid);
1136                 if (p)
1137                         domain = tomoyo_real_domain(p);
1138                 read_unlock(&tasklist_lock);
1139                 rcu_read_unlock();
1140                 if (domain)
1141                         tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1142                                          domain->domainname->name);
1143                 head->read_eof = true;
1144         }
1145 }
1146
1147 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1148         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE]
1149         = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN,
1150         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]
1151         = TOMOYO_KEYWORD_INITIALIZE_DOMAIN,
1152         [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN,
1153         [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN
1154 };
1155
1156 /**
1157  * tomoyo_write_exception_policy - Write exception policy.
1158  *
1159  * @head: Pointer to "struct tomoyo_io_buffer".
1160  *
1161  * Returns 0 on success, negative value otherwise.
1162  *
1163  * Caller holds tomoyo_read_lock().
1164  */
1165 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1166 {
1167         char *data = head->write_buf;
1168         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1169         u8 i;
1170
1171         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) {
1172                 if (tomoyo_str_starts(&data, tomoyo_transition_type[i]))
1173                         return tomoyo_write_transition_control(data, is_delete,
1174                                                                i);
1175         }
1176         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
1177                 return tomoyo_write_aggregator_policy(data, is_delete);
1178         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1179                 return tomoyo_write_globally_readable_policy(data, is_delete);
1180         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1181                 return tomoyo_write_pattern_policy(data, is_delete);
1182         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1183                 return tomoyo_write_no_rewrite_policy(data, is_delete);
1184         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1185                 return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP);
1186         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1187                 return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP);
1188         return -EINVAL;
1189 }
1190
1191 static void tomoyo_print_number(char *buffer, int buffer_len,
1192                              const struct tomoyo_number_union *ptr)
1193 {
1194         int i;
1195         unsigned long min = ptr->values[0];
1196         const unsigned long max = ptr->values[1];
1197         u8 min_type = ptr->min_type;
1198         const u8 max_type = ptr->max_type;
1199         memset(buffer, 0, buffer_len);
1200         buffer_len -= 2;
1201         for (i = 0; i < 2; i++) {
1202                 int len;
1203                 switch (min_type) {
1204                 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
1205                         snprintf(buffer, buffer_len, "0x%lX", min);
1206                         break;
1207                 case TOMOYO_VALUE_TYPE_OCTAL:
1208                         snprintf(buffer, buffer_len, "0%lo", min);
1209                         break;
1210                 default:
1211                         snprintf(buffer, buffer_len, "%lu", min);
1212                         break;
1213                 }
1214                 if (min == max && min_type == max_type)
1215                         break;
1216                 len = strlen(buffer);
1217                 buffer[len++] = '-';
1218                 buffer += len;
1219                 buffer_len -= len;
1220                 min_type = max_type;
1221                 min = max;
1222         }
1223 }
1224
1225 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1226         [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP,
1227         [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP
1228 };
1229
1230 /**
1231  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1232  *
1233  * @head: Pointer to "struct tomoyo_io_buffer".
1234  * @idx:  Index number.
1235  *
1236  * Returns true on success, false otherwise.
1237  *
1238  * Caller holds tomoyo_read_lock().
1239  */
1240 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1241 {
1242         const char *w[3] = { "", "", "" };
1243         w[0] = tomoyo_group_name[idx];
1244         list_for_each_cookie(head->read_var1, &tomoyo_group_list[idx]) {
1245                 struct tomoyo_group *group =
1246                         list_entry(head->read_var1, typeof(*group), list);
1247                 w[1] = group->group_name->name;
1248                 list_for_each_cookie(head->read_var2, &group->member_list) {
1249                         char buffer[128];
1250                         struct tomoyo_acl_head *ptr =
1251                                 list_entry(head->read_var2, typeof(*ptr), list);
1252                         if (ptr->is_deleted)
1253                                 continue;
1254                         if (idx == TOMOYO_PATH_GROUP) {
1255                                 w[2] = container_of(ptr,
1256                                                     struct tomoyo_path_group,
1257                                                     head)->member_name->name;
1258                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1259                                 tomoyo_print_number(buffer, sizeof(buffer),
1260                                                     &container_of
1261                                                     (ptr, struct
1262                                                      tomoyo_number_group,
1263                                                      head)->number);
1264                                 w[2] = buffer;
1265                         }
1266                         if (!tomoyo_io_printf(head, "%s%s %s\n", w[0], w[1],
1267                                               w[2]))
1268                                 return false;
1269                 }
1270                 head->read_var2 = NULL;
1271         }
1272         head->read_var1 = NULL;
1273         return true;
1274 }
1275
1276 /**
1277  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1278  *
1279  * @head: Pointer to "struct tomoyo_io_buffer".
1280  * @idx:  Index number.
1281  *
1282  * Returns true on success, false otherwise.
1283  *
1284  * Caller holds tomoyo_read_lock().
1285  */
1286 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1287 {
1288         list_for_each_cookie(head->read_var2, &tomoyo_policy_list[idx]) {
1289                 const char *w[4] = { "", "", "", "" };
1290                 struct tomoyo_acl_head *acl =
1291                         container_of(head->read_var2, typeof(*acl), list);
1292                 if (acl->is_deleted)
1293                         continue;
1294                 switch (idx) {
1295                 case TOMOYO_ID_TRANSITION_CONTROL:
1296                         {
1297                                 struct tomoyo_transition_control *ptr =
1298                                         container_of(acl, typeof(*ptr), head);
1299                                 w[0] = tomoyo_transition_type[ptr->type];
1300                                 if (ptr->program)
1301                                         w[1] = ptr->program->name;
1302                                 if (ptr->domainname)
1303                                         w[3] = ptr->domainname->name;
1304                                 if (w[1][0] && w[3][0])
1305                                         w[2] = " from ";
1306                         }
1307                         break;
1308                 case TOMOYO_ID_GLOBALLY_READABLE:
1309                         {
1310                                 struct tomoyo_globally_readable_file_entry *ptr
1311                                         = container_of(acl, typeof(*ptr), head);
1312                                 w[0] = TOMOYO_KEYWORD_ALLOW_READ;
1313                                 w[1] = ptr->filename->name;
1314                         }
1315                         break;
1316                 case TOMOYO_ID_AGGREGATOR:
1317                         {
1318                                 struct tomoyo_aggregator_entry *ptr =
1319                                         container_of(acl, typeof(*ptr), head);
1320                                 w[0] = TOMOYO_KEYWORD_AGGREGATOR;
1321                                 w[1] = ptr->original_name->name;
1322                                 w[2] = " ";
1323                                 w[3] = ptr->aggregated_name->name;
1324                         }
1325                         break;
1326                 case TOMOYO_ID_PATTERN:
1327                         {
1328                                 struct tomoyo_pattern_entry *ptr =
1329                                         container_of(acl, typeof(*ptr), head);
1330                                 w[0] = TOMOYO_KEYWORD_FILE_PATTERN;
1331                                 w[1] = ptr->pattern->name;
1332                         }
1333                         break;
1334                 case TOMOYO_ID_NO_REWRITE:
1335                         {
1336                                 struct tomoyo_no_rewrite_entry *ptr =
1337                                         container_of(acl, typeof(*ptr), head);
1338                                 w[0] = TOMOYO_KEYWORD_DENY_REWRITE;
1339                                 w[1] = ptr->pattern->name;
1340                         }
1341                         break;
1342                 default:
1343                         continue;
1344                 }
1345                 if (!tomoyo_io_printf(head, "%s%s%s%s\n", w[0], w[1], w[2],
1346                                       w[3]))
1347                         return false;
1348         }
1349         head->read_var2 = NULL;
1350         return true;
1351 }
1352
1353 /**
1354  * tomoyo_read_exception_policy - Read exception policy.
1355  *
1356  * @head: Pointer to "struct tomoyo_io_buffer".
1357  *
1358  * Caller holds tomoyo_read_lock().
1359  */
1360 static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1361 {
1362         if (head->read_eof)
1363                 return;
1364         while (head->read_step < TOMOYO_MAX_POLICY &&
1365                tomoyo_read_policy(head, head->read_step))
1366                 head->read_step++;
1367         if (head->read_step < TOMOYO_MAX_POLICY)
1368                 return;
1369         while (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1370                tomoyo_read_group(head, head->read_step - TOMOYO_MAX_POLICY))
1371                 head->read_step++;
1372         if (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1373                 return;
1374         head->read_eof = true;
1375 }
1376
1377 /**
1378  * tomoyo_print_header - Get header line of audit log.
1379  *
1380  * @r: Pointer to "struct tomoyo_request_info".
1381  *
1382  * Returns string representation.
1383  *
1384  * This function uses kmalloc(), so caller must kfree() if this function
1385  * didn't return NULL.
1386  */
1387 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1388 {
1389         static const char *tomoyo_mode_4[4] = {
1390                 "disabled", "learning", "permissive", "enforcing"
1391         };
1392         struct timeval tv;
1393         const pid_t gpid = task_pid_nr(current);
1394         static const int tomoyo_buffer_len = 4096;
1395         char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1396         if (!buffer)
1397                 return NULL;
1398         do_gettimeofday(&tv);
1399         snprintf(buffer, tomoyo_buffer_len - 1,
1400                  "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1401                  " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1402                  " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1403                  tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid,
1404                  (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1405                  current_uid(), current_gid(), current_euid(),
1406                  current_egid(), current_suid(), current_sgid(),
1407                  current_fsuid(), current_fsgid());
1408         return buffer;
1409 }
1410
1411 /**
1412  * tomoyo_init_audit_log - Allocate buffer for audit logs.
1413  *
1414  * @len: Required size.
1415  * @r:   Pointer to "struct tomoyo_request_info".
1416  *
1417  * Returns pointer to allocated memory.
1418  *
1419  * The @len is updated to add the header lines' size on success.
1420  *
1421  * This function uses kzalloc(), so caller must kfree() if this function
1422  * didn't return NULL.
1423  */
1424 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1425 {
1426         char *buf = NULL;
1427         const char *header;
1428         const char *domainname;
1429         if (!r->domain)
1430                 r->domain = tomoyo_domain();
1431         domainname = r->domain->domainname->name;
1432         header = tomoyo_print_header(r);
1433         if (!header)
1434                 return NULL;
1435         *len += strlen(domainname) + strlen(header) + 10;
1436         buf = kzalloc(*len, GFP_NOFS);
1437         if (buf)
1438                 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1439         kfree(header);
1440         return buf;
1441 }
1442
1443 /* Wait queue for tomoyo_query_list. */
1444 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1445
1446 /* Lock for manipulating tomoyo_query_list. */
1447 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1448
1449 /* Structure for query. */
1450 struct tomoyo_query_entry {
1451         struct list_head list;
1452         char *query;
1453         int query_len;
1454         unsigned int serial;
1455         int timer;
1456         int answer;
1457 };
1458
1459 /* The list for "struct tomoyo_query_entry". */
1460 static LIST_HEAD(tomoyo_query_list);
1461
1462 /*
1463  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1464  * interface.
1465  */
1466 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1467
1468 /**
1469  * tomoyo_supervisor - Ask for the supervisor's decision.
1470  *
1471  * @r:       Pointer to "struct tomoyo_request_info".
1472  * @fmt:     The printf()'s format string, followed by parameters.
1473  *
1474  * Returns 0 if the supervisor decided to permit the access request which
1475  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1476  * supervisor decided to retry the access request which violated the policy in
1477  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1478  */
1479 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1480 {
1481         va_list args;
1482         int error = -EPERM;
1483         int pos;
1484         int len;
1485         static unsigned int tomoyo_serial;
1486         struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1487         bool quota_exceeded = false;
1488         char *header;
1489         switch (r->mode) {
1490                 char *buffer;
1491         case TOMOYO_CONFIG_LEARNING:
1492                 if (!tomoyo_domain_quota_is_ok(r))
1493                         return 0;
1494                 va_start(args, fmt);
1495                 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1496                 va_end(args);
1497                 buffer = kmalloc(len, GFP_NOFS);
1498                 if (!buffer)
1499                         return 0;
1500                 va_start(args, fmt);
1501                 vsnprintf(buffer, len - 1, fmt, args);
1502                 va_end(args);
1503                 tomoyo_normalize_line(buffer);
1504                 tomoyo_write_domain_policy2(buffer, r->domain, false);
1505                 kfree(buffer);
1506                 /* fall through */
1507         case TOMOYO_CONFIG_PERMISSIVE:
1508                 return 0;
1509         }
1510         if (!r->domain)
1511                 r->domain = tomoyo_domain();
1512         if (!atomic_read(&tomoyo_query_observers))
1513                 return -EPERM;
1514         va_start(args, fmt);
1515         len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1516         va_end(args);
1517         header = tomoyo_init_audit_log(&len, r);
1518         if (!header)
1519                 goto out;
1520         tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1521         if (!tomoyo_query_entry)
1522                 goto out;
1523         tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1524         if (!tomoyo_query_entry->query)
1525                 goto out;
1526         len = ksize(tomoyo_query_entry->query);
1527         INIT_LIST_HEAD(&tomoyo_query_entry->list);
1528         spin_lock(&tomoyo_query_list_lock);
1529         if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1530             sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1531                 quota_exceeded = true;
1532         } else {
1533                 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1534                 tomoyo_query_entry->serial = tomoyo_serial++;
1535         }
1536         spin_unlock(&tomoyo_query_list_lock);
1537         if (quota_exceeded)
1538                 goto out;
1539         pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1540                        tomoyo_query_entry->serial, r->retry, header);
1541         kfree(header);
1542         header = NULL;
1543         va_start(args, fmt);
1544         vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1545         tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1546         va_end(args);
1547         spin_lock(&tomoyo_query_list_lock);
1548         list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1549         spin_unlock(&tomoyo_query_list_lock);
1550         /* Give 10 seconds for supervisor's opinion. */
1551         for (tomoyo_query_entry->timer = 0;
1552              atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1553              tomoyo_query_entry->timer++) {
1554                 wake_up(&tomoyo_query_wait);
1555                 set_current_state(TASK_INTERRUPTIBLE);
1556                 schedule_timeout(HZ / 10);
1557                 if (tomoyo_query_entry->answer)
1558                         break;
1559         }
1560         spin_lock(&tomoyo_query_list_lock);
1561         list_del(&tomoyo_query_entry->list);
1562         tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1563         spin_unlock(&tomoyo_query_list_lock);
1564         switch (tomoyo_query_entry->answer) {
1565         case 3: /* Asked to retry by administrator. */
1566                 error = TOMOYO_RETRY_REQUEST;
1567                 r->retry++;
1568                 break;
1569         case 1:
1570                 /* Granted by administrator. */
1571                 error = 0;
1572                 break;
1573         case 0:
1574                 /* Timed out. */
1575                 break;
1576         default:
1577                 /* Rejected by administrator. */
1578                 break;
1579         }
1580  out:
1581         if (tomoyo_query_entry)
1582                 kfree(tomoyo_query_entry->query);
1583         kfree(tomoyo_query_entry);
1584         kfree(header);
1585         return error;
1586 }
1587
1588 /**
1589  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1590  *
1591  * @file: Pointer to "struct file".
1592  * @wait: Pointer to "poll_table".
1593  *
1594  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1595  *
1596  * Waits for access requests which violated policy in enforcing mode.
1597  */
1598 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1599 {
1600         struct list_head *tmp;
1601         bool found = false;
1602         u8 i;
1603         for (i = 0; i < 2; i++) {
1604                 spin_lock(&tomoyo_query_list_lock);
1605                 list_for_each(tmp, &tomoyo_query_list) {
1606                         struct tomoyo_query_entry *ptr
1607                                 = list_entry(tmp, struct tomoyo_query_entry,
1608                                              list);
1609                         if (ptr->answer)
1610                                 continue;
1611                         found = true;
1612                         break;
1613                 }
1614                 spin_unlock(&tomoyo_query_list_lock);
1615                 if (found)
1616                         return POLLIN | POLLRDNORM;
1617                 if (i)
1618                         break;
1619                 poll_wait(file, &tomoyo_query_wait, wait);
1620         }
1621         return 0;
1622 }
1623
1624 /**
1625  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1626  *
1627  * @head: Pointer to "struct tomoyo_io_buffer".
1628  */
1629 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1630 {
1631         struct list_head *tmp;
1632         int pos = 0;
1633         int len = 0;
1634         char *buf;
1635         if (head->read_avail)
1636                 return;
1637         if (head->read_buf) {
1638                 kfree(head->read_buf);
1639                 head->read_buf = NULL;
1640                 head->readbuf_size = 0;
1641         }
1642         spin_lock(&tomoyo_query_list_lock);
1643         list_for_each(tmp, &tomoyo_query_list) {
1644                 struct tomoyo_query_entry *ptr
1645                         = list_entry(tmp, struct tomoyo_query_entry, list);
1646                 if (ptr->answer)
1647                         continue;
1648                 if (pos++ != head->read_step)
1649                         continue;
1650                 len = ptr->query_len;
1651                 break;
1652         }
1653         spin_unlock(&tomoyo_query_list_lock);
1654         if (!len) {
1655                 head->read_step = 0;
1656                 return;
1657         }
1658         buf = kzalloc(len, GFP_NOFS);
1659         if (!buf)
1660                 return;
1661         pos = 0;
1662         spin_lock(&tomoyo_query_list_lock);
1663         list_for_each(tmp, &tomoyo_query_list) {
1664                 struct tomoyo_query_entry *ptr
1665                         = list_entry(tmp, struct tomoyo_query_entry, list);
1666                 if (ptr->answer)
1667                         continue;
1668                 if (pos++ != head->read_step)
1669                         continue;
1670                 /*
1671                  * Some query can be skipped because tomoyo_query_list
1672                  * can change, but I don't care.
1673                  */
1674                 if (len == ptr->query_len)
1675                         memmove(buf, ptr->query, len);
1676                 break;
1677         }
1678         spin_unlock(&tomoyo_query_list_lock);
1679         if (buf[0]) {
1680                 head->read_avail = len;
1681                 head->readbuf_size = head->read_avail;
1682                 head->read_buf = buf;
1683                 head->read_step++;
1684         } else {
1685                 kfree(buf);
1686         }
1687 }
1688
1689 /**
1690  * tomoyo_write_answer - Write the supervisor's decision.
1691  *
1692  * @head: Pointer to "struct tomoyo_io_buffer".
1693  *
1694  * Returns 0 on success, -EINVAL otherwise.
1695  */
1696 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1697 {
1698         char *data = head->write_buf;
1699         struct list_head *tmp;
1700         unsigned int serial;
1701         unsigned int answer;
1702         spin_lock(&tomoyo_query_list_lock);
1703         list_for_each(tmp, &tomoyo_query_list) {
1704                 struct tomoyo_query_entry *ptr
1705                         = list_entry(tmp, struct tomoyo_query_entry, list);
1706                 ptr->timer = 0;
1707         }
1708         spin_unlock(&tomoyo_query_list_lock);
1709         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1710                 return -EINVAL;
1711         spin_lock(&tomoyo_query_list_lock);
1712         list_for_each(tmp, &tomoyo_query_list) {
1713                 struct tomoyo_query_entry *ptr
1714                         = list_entry(tmp, struct tomoyo_query_entry, list);
1715                 if (ptr->serial != serial)
1716                         continue;
1717                 if (!ptr->answer)
1718                         ptr->answer = answer;
1719                 break;
1720         }
1721         spin_unlock(&tomoyo_query_list_lock);
1722         return 0;
1723 }
1724
1725 /**
1726  * tomoyo_read_version: Get version.
1727  *
1728  * @head: Pointer to "struct tomoyo_io_buffer".
1729  *
1730  * Returns version information.
1731  */
1732 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1733 {
1734         if (!head->read_eof) {
1735                 tomoyo_io_printf(head, "2.3.0-pre");
1736                 head->read_eof = true;
1737         }
1738 }
1739
1740 /**
1741  * tomoyo_read_self_domain - Get the current process's domainname.
1742  *
1743  * @head: Pointer to "struct tomoyo_io_buffer".
1744  *
1745  * Returns the current process's domainname.
1746  */
1747 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1748 {
1749         if (!head->read_eof) {
1750                 /*
1751                  * tomoyo_domain()->domainname != NULL
1752                  * because every process belongs to a domain and
1753                  * the domain's name cannot be NULL.
1754                  */
1755                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1756                 head->read_eof = true;
1757         }
1758 }
1759
1760 /**
1761  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1762  *
1763  * @type: Type of interface.
1764  * @file: Pointer to "struct file".
1765  *
1766  * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1767  *
1768  * Caller acquires tomoyo_read_lock().
1769  */
1770 int tomoyo_open_control(const u8 type, struct file *file)
1771 {
1772         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1773
1774         if (!head)
1775                 return -ENOMEM;
1776         mutex_init(&head->io_sem);
1777         head->type = type;
1778         switch (type) {
1779         case TOMOYO_DOMAINPOLICY:
1780                 /* /sys/kernel/security/tomoyo/domain_policy */
1781                 head->write = tomoyo_write_domain_policy;
1782                 head->read = tomoyo_read_domain_policy;
1783                 break;
1784         case TOMOYO_EXCEPTIONPOLICY:
1785                 /* /sys/kernel/security/tomoyo/exception_policy */
1786                 head->write = tomoyo_write_exception_policy;
1787                 head->read = tomoyo_read_exception_policy;
1788                 break;
1789         case TOMOYO_SELFDOMAIN:
1790                 /* /sys/kernel/security/tomoyo/self_domain */
1791                 head->read = tomoyo_read_self_domain;
1792                 break;
1793         case TOMOYO_DOMAIN_STATUS:
1794                 /* /sys/kernel/security/tomoyo/.domain_status */
1795                 head->write = tomoyo_write_domain_profile;
1796                 head->read = tomoyo_read_domain_profile;
1797                 break;
1798         case TOMOYO_PROCESS_STATUS:
1799                 /* /sys/kernel/security/tomoyo/.process_status */
1800                 head->write = tomoyo_write_pid;
1801                 head->read = tomoyo_read_pid;
1802                 break;
1803         case TOMOYO_VERSION:
1804                 /* /sys/kernel/security/tomoyo/version */
1805                 head->read = tomoyo_read_version;
1806                 head->readbuf_size = 128;
1807                 break;
1808         case TOMOYO_MEMINFO:
1809                 /* /sys/kernel/security/tomoyo/meminfo */
1810                 head->write = tomoyo_write_memory_quota;
1811                 head->read = tomoyo_read_memory_counter;
1812                 head->readbuf_size = 512;
1813                 break;
1814         case TOMOYO_PROFILE:
1815                 /* /sys/kernel/security/tomoyo/profile */
1816                 head->write = tomoyo_write_profile;
1817                 head->read = tomoyo_read_profile;
1818                 break;
1819         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1820                 head->poll = tomoyo_poll_query;
1821                 head->write = tomoyo_write_answer;
1822                 head->read = tomoyo_read_query;
1823                 break;
1824         case TOMOYO_MANAGER:
1825                 /* /sys/kernel/security/tomoyo/manager */
1826                 head->write = tomoyo_write_manager_policy;
1827                 head->read = tomoyo_read_manager_policy;
1828                 break;
1829         }
1830         if (!(file->f_mode & FMODE_READ)) {
1831                 /*
1832                  * No need to allocate read_buf since it is not opened
1833                  * for reading.
1834                  */
1835                 head->read = NULL;
1836                 head->poll = NULL;
1837         } else if (!head->poll) {
1838                 /* Don't allocate read_buf for poll() access. */
1839                 if (!head->readbuf_size)
1840                         head->readbuf_size = 4096 * 2;
1841                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1842                 if (!head->read_buf) {
1843                         kfree(head);
1844                         return -ENOMEM;
1845                 }
1846         }
1847         if (!(file->f_mode & FMODE_WRITE)) {
1848                 /*
1849                  * No need to allocate write_buf since it is not opened
1850                  * for writing.
1851                  */
1852                 head->write = NULL;
1853         } else if (head->write) {
1854                 head->writebuf_size = 4096 * 2;
1855                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1856                 if (!head->write_buf) {
1857                         kfree(head->read_buf);
1858                         kfree(head);
1859                         return -ENOMEM;
1860                 }
1861         }
1862         if (type != TOMOYO_QUERY)
1863                 head->reader_idx = tomoyo_read_lock();
1864         file->private_data = head;
1865         /*
1866          * Call the handler now if the file is
1867          * /sys/kernel/security/tomoyo/self_domain
1868          * so that the user can use
1869          * cat < /sys/kernel/security/tomoyo/self_domain"
1870          * to know the current process's domainname.
1871          */
1872         if (type == TOMOYO_SELFDOMAIN)
1873                 tomoyo_read_control(file, NULL, 0);
1874         /*
1875          * If the file is /sys/kernel/security/tomoyo/query , increment the
1876          * observer counter.
1877          * The obserber counter is used by tomoyo_supervisor() to see if
1878          * there is some process monitoring /sys/kernel/security/tomoyo/query.
1879          */
1880         else if (type == TOMOYO_QUERY)
1881                 atomic_inc(&tomoyo_query_observers);
1882         return 0;
1883 }
1884
1885 /**
1886  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1887  *
1888  * @file: Pointer to "struct file".
1889  * @wait: Pointer to "poll_table".
1890  *
1891  * Waits for read readiness.
1892  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1893  */
1894 int tomoyo_poll_control(struct file *file, poll_table *wait)
1895 {
1896         struct tomoyo_io_buffer *head = file->private_data;
1897         if (!head->poll)
1898                 return -ENOSYS;
1899         return head->poll(file, wait);
1900 }
1901
1902 /**
1903  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1904  *
1905  * @file:       Pointer to "struct file".
1906  * @buffer:     Poiner to buffer to write to.
1907  * @buffer_len: Size of @buffer.
1908  *
1909  * Returns bytes read on success, negative value otherwise.
1910  *
1911  * Caller holds tomoyo_read_lock().
1912  */
1913 int tomoyo_read_control(struct file *file, char __user *buffer,
1914                         const int buffer_len)
1915 {
1916         int len = 0;
1917         struct tomoyo_io_buffer *head = file->private_data;
1918         char *cp;
1919
1920         if (!head->read)
1921                 return -ENOSYS;
1922         if (mutex_lock_interruptible(&head->io_sem))
1923                 return -EINTR;
1924         /* Call the policy handler. */
1925         head->read(head);
1926         if (len < 0)
1927                 goto out;
1928         /* Write to buffer. */
1929         len = head->read_avail;
1930         if (len > buffer_len)
1931                 len = buffer_len;
1932         if (!len)
1933                 goto out;
1934         /* head->read_buf changes by some functions. */
1935         cp = head->read_buf;
1936         if (copy_to_user(buffer, cp, len)) {
1937                 len = -EFAULT;
1938                 goto out;
1939         }
1940         head->read_avail -= len;
1941         memmove(cp, cp + len, head->read_avail);
1942  out:
1943         mutex_unlock(&head->io_sem);
1944         return len;
1945 }
1946
1947 /**
1948  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1949  *
1950  * @file:       Pointer to "struct file".
1951  * @buffer:     Pointer to buffer to read from.
1952  * @buffer_len: Size of @buffer.
1953  *
1954  * Returns @buffer_len on success, negative value otherwise.
1955  *
1956  * Caller holds tomoyo_read_lock().
1957  */
1958 int tomoyo_write_control(struct file *file, const char __user *buffer,
1959                          const int buffer_len)
1960 {
1961         struct tomoyo_io_buffer *head = file->private_data;
1962         int error = buffer_len;
1963         int avail_len = buffer_len;
1964         char *cp0 = head->write_buf;
1965
1966         if (!head->write)
1967                 return -ENOSYS;
1968         if (!access_ok(VERIFY_READ, buffer, buffer_len))
1969                 return -EFAULT;
1970         /* Don't allow updating policies by non manager programs. */
1971         if (head->write != tomoyo_write_pid &&
1972             head->write != tomoyo_write_domain_policy &&
1973             !tomoyo_policy_manager())
1974                 return -EPERM;
1975         if (mutex_lock_interruptible(&head->io_sem))
1976                 return -EINTR;
1977         /* Read a line and dispatch it to the policy handler. */
1978         while (avail_len > 0) {
1979                 char c;
1980                 if (head->write_avail >= head->writebuf_size - 1) {
1981                         error = -ENOMEM;
1982                         break;
1983                 } else if (get_user(c, buffer)) {
1984                         error = -EFAULT;
1985                         break;
1986                 }
1987                 buffer++;
1988                 avail_len--;
1989                 cp0[head->write_avail++] = c;
1990                 if (c != '\n')
1991                         continue;
1992                 cp0[head->write_avail - 1] = '\0';
1993                 head->write_avail = 0;
1994                 tomoyo_normalize_line(cp0);
1995                 head->write(head);
1996         }
1997         mutex_unlock(&head->io_sem);
1998         return error;
1999 }
2000
2001 /**
2002  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2003  *
2004  * @file: Pointer to "struct file".
2005  *
2006  * Releases memory and returns 0.
2007  *
2008  * Caller looses tomoyo_read_lock().
2009  */
2010 int tomoyo_close_control(struct file *file)
2011 {
2012         struct tomoyo_io_buffer *head = file->private_data;
2013         const bool is_write = !!head->write_buf;
2014
2015         /*
2016          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2017          * observer counter.
2018          */
2019         if (head->type == TOMOYO_QUERY)
2020                 atomic_dec(&tomoyo_query_observers);
2021         else
2022                 tomoyo_read_unlock(head->reader_idx);
2023         /* Release memory used for policy I/O. */
2024         kfree(head->read_buf);
2025         head->read_buf = NULL;
2026         kfree(head->write_buf);
2027         head->write_buf = NULL;
2028         kfree(head);
2029         head = NULL;
2030         file->private_data = NULL;
2031         if (is_write)
2032                 tomoyo_run_gc();
2033         return 0;
2034 }
2035
2036 /**
2037  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2038  */
2039 void tomoyo_check_profile(void)
2040 {
2041         struct tomoyo_domain_info *domain;
2042         const int idx = tomoyo_read_lock();
2043         tomoyo_policy_loaded = true;
2044         /* Check all profiles currently assigned to domains are defined. */
2045         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2046                 const u8 profile = domain->profile;
2047                 if (tomoyo_profile_ptr[profile])
2048                         continue;
2049                 panic("Profile %u (used by '%s') not defined.\n",
2050                       profile, domain->domainname->name);
2051         }
2052         tomoyo_read_unlock(idx);
2053         if (tomoyo_profile_version != 20090903)
2054                 panic("Profile version %u is not supported.\n",
2055                       tomoyo_profile_version);
2056         printk(KERN_INFO "TOMOYO: 2.3.0-pre   2010/06/03\n");
2057         printk(KERN_INFO "Mandatory Access Control activated.\n");
2058 }