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] = {
  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 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
  80 {
  81         va_list args;
  82         const int pos = strlen(buffer);
  83         va_start(args, fmt);
  84         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
  85         va_end(args);
  86 }
  87
  88 /**
  89  * tomoyo_flush - Flush queued string to userspace's buffer.
  90  *
  91  * @head:   Pointer to "struct tomoyo_io_buffer".
  92  *
  93  * Returns true if all data was flushed, false otherwise.
  94  */
  95 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
  96 {
  97         while (head->r.w_pos) {
  98                 const char *w = head->r.w[0];
  99                 int len = strlen(w);
 100                 if (len) {
 101                         if (len > head->read_user_buf_avail)
 102                                 len = head->read_user_buf_avail;
 103                         if (!len)
 104                                 return false;
 105                         if (copy_to_user(head->read_user_buf, w, len))
 106                                 return false;
 107                         head->read_user_buf_avail -= len;
 108                         head->read_user_buf += len;
 109                         w += len;
 110                 }
 111                 if (*w) {
 112                         head->r.w[0] = w;
 113                         return false;
 114                 }
 115                 /* Add '\0' for query. */
 116                 if (head->poll) {
 117                         if (!head->read_user_buf_avail ||
 118                             copy_to_user(head->read_user_buf, "", 1))
 119                                 return false;
 120                         head->read_user_buf_avail--;
 121                         head->read_user_buf++;
 122                 }
 123                 head->r.w_pos--;
 124                 for (len = 0; len < head->r.w_pos; len++)
 125                         head->r.w[len] = head->r.w[len + 1];
 126         }
 127         head->r.avail = 0;
 128         return true;
 129 }
 130
 131 /**
 132  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 133  *
 134  * @head:   Pointer to "struct tomoyo_io_buffer".
 135  * @string: String to print.
 136  *
 137  * Note that @string has to be kept valid until @head is kfree()d.
 138  * This means that char[] allocated on stack memory cannot be passed to
 139  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 140  */
 141 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 142 {
 143         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 144                 head->r.w[head->r.w_pos++] = string;
 145                 tomoyo_flush(head);
 146         } else
 147                 WARN_ON(1);
 148 }
 149
 150 /**
 151  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 152  *
 153  * @head: Pointer to "struct tomoyo_io_buffer".
 154  * @fmt:  The printf()'s format string, followed by parameters.
 155  */
 156 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 157 {
 158         va_list args;
 159         int len;
 160         int pos = head->r.avail;
 161         int size = head->readbuf_size - pos;
 162         if (size <= 0)
 163                 return;
 164         va_start(args, fmt);
 165         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 166         va_end(args);
 167         if (pos + len >= head->readbuf_size) {
 168                 WARN_ON(1);
 169                 return;
 170         }
 171         head->r.avail += len;
 172         tomoyo_set_string(head, head->read_buf + pos);
 173 }
 174
 175 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 176 {
 177         tomoyo_set_string(head, " ");
 178 }
 179
 180 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 181 {
 182         tomoyo_set_string(head, "\n");
 183         return !head->r.w_pos;
 184 }
 185
 186 /**
 187  * tomoyo_print_name_union - Print a tomoyo_name_union.
 188  *
 189  * @head: Pointer to "struct tomoyo_io_buffer".
 190  * @ptr:  Pointer to "struct tomoyo_name_union".
 191  */
 192 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 193                                     const struct tomoyo_name_union *ptr)
 194 {
 195         tomoyo_set_space(head);
 196         if (ptr->is_group) {
 197                 tomoyo_set_string(head, "@");
 198                 tomoyo_set_string(head, ptr->group->group_name->name);
 199         } else {
 200                 tomoyo_set_string(head, ptr->filename->name);
 201         }
 202 }
 203
 204 /**
 205  * tomoyo_print_number_union - Print a tomoyo_number_union.
 206  *
 207  * @head:       Pointer to "struct tomoyo_io_buffer".
 208  * @ptr:        Pointer to "struct tomoyo_number_union".
 209  */
 210 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 211                                       const struct tomoyo_number_union *ptr)
 212 {
 213         tomoyo_set_space(head);
 214         if (ptr->is_group) {
 215                 tomoyo_set_string(head, "@");
 216                 tomoyo_set_string(head, ptr->group->group_name->name);
 217         } else {
 218                 int i;
 219                 unsigned long min = ptr->values[0];
 220                 const unsigned long max = ptr->values[1];
 221                 u8 min_type = ptr->min_type;
 222                 const u8 max_type = ptr->max_type;
 223                 char buffer[128];
 224                 buffer[0] = '\0';
 225                 for (i = 0; i < 2; i++) {
 226                         switch (min_type) {
 227                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 228                                 tomoyo_addprintf(buffer, sizeof(buffer),
 229                                                  "0x%lX", min);
 230                                 break;
 231                         case TOMOYO_VALUE_TYPE_OCTAL:
 232                                 tomoyo_addprintf(buffer, sizeof(buffer),
 233                                                  "0%lo", min);
 234                                 break;
 235                         default:
 236                                 tomoyo_addprintf(buffer, sizeof(buffer),
 237                                                  "%lu", min);
 238                                 break;
 239                         }
 240                         if (min == max && min_type == max_type)
 241                                 break;
 242                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 243                         min_type = max_type;
 244                         min = max;
 245                 }
 246                 tomoyo_io_printf(head, "%s", buffer);
 247         }
 248 }
 249
 250 /**
 251  * tomoyo_find_or_assign_new_profile - Create a new profile.
 252  *
 253  * @profile: Profile number to create.
 254  *
 255  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 256  */
 257 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile
 258 (const unsigned int profile)
 259 {
 260         struct tomoyo_profile *ptr;
 261         struct tomoyo_profile *entry;
 262         if (profile >= TOMOYO_MAX_PROFILES)
 263                 return NULL;
 264         ptr = tomoyo_profile_ptr[profile];
 265         if (ptr)
 266                 return ptr;
 267         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 268         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 269                 goto out;
 270         ptr = tomoyo_profile_ptr[profile];
 271         if (!ptr && tomoyo_memory_ok(entry)) {
 272                 ptr = entry;
 273                 ptr->learning = &tomoyo_default_profile.preference;
 274                 ptr->permissive = &tomoyo_default_profile.preference;
 275                 ptr->enforcing = &tomoyo_default_profile.preference;
 276                 ptr->default_config = TOMOYO_CONFIG_DISABLED;
 277                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 278                        sizeof(ptr->config));
 279                 mb(); /* Avoid out-of-order execution. */
 280                 tomoyo_profile_ptr[profile] = ptr;
 281                 entry = NULL;
 282         }
 283         mutex_unlock(&tomoyo_policy_lock);
 284  out:
 285         kfree(entry);
 286         return ptr;
 287 }
 288
 289 /**
 290  * tomoyo_profile - Find a profile.
 291  *
 292  * @profile: Profile number to find.
 293  *
 294  * Returns pointer to "struct tomoyo_profile".
 295  */
 296 struct tomoyo_profile *tomoyo_profile(const u8 profile)
 297 {
 298         struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
 299         if (!tomoyo_policy_loaded)
 300                 return &tomoyo_default_profile;
 301         BUG_ON(!ptr);
 302         return ptr;
 303 }
 304
 305 static s8 tomoyo_find_yesno(const char *string, const char *find)
 306 {
 307         const char *cp = strstr(string, find);
 308         if (cp) {
 309                 cp += strlen(find);
 310                 if (!strncmp(cp, "=yes", 4))
 311                         return 1;
 312                 else if (!strncmp(cp, "=no", 3))
 313                         return 0;
 314         }
 315         return -1;
 316 }
 317
 318 static void tomoyo_set_bool(bool *b, const char *string, const char *find)
 319 {
 320         switch (tomoyo_find_yesno(string, find)) {
 321         case 1:
 322                 *b = true;
 323                 break;
 324         case 0:
 325                 *b = false;
 326                 break;
 327         }
 328 }
 329
 330 static void tomoyo_set_uint(unsigned int *i, const char *string,
 331                             const char *find)
 332 {
 333         const char *cp = strstr(string, find);
 334         if (cp)
 335                 sscanf(cp + strlen(find), "=%u", i);
 336 }
 337
 338 static void tomoyo_set_pref(const char *name, const char *value,
 339                             const bool use_default,
 340                             struct tomoyo_profile *profile)
 341 {
 342         struct tomoyo_preference **pref;
 343         bool *verbose;
 344         if (!strcmp(name, "enforcing")) {
 345                 if (use_default) {
 346                         pref = &profile->enforcing;
 347                         goto set_default;
 348                 }
 349                 profile->enforcing = &profile->preference;
 350                 verbose = &profile->preference.enforcing_verbose;
 351                 goto set_verbose;
 352         }
 353         if (!strcmp(name, "permissive")) {
 354                 if (use_default) {
 355                         pref = &profile->permissive;
 356                         goto set_default;
 357                 }
 358                 profile->permissive = &profile->preference;
 359                 verbose = &profile->preference.permissive_verbose;
 360                 goto set_verbose;
 361         }
 362         if (!strcmp(name, "learning")) {
 363                 if (use_default) {
 364                         pref = &profile->learning;
 365                         goto set_default;
 366                 }
 367                 profile->learning = &profile->preference;
 368                 tomoyo_set_uint(&profile->preference.learning_max_entry, value,
 369                              "max_entry");
 370                 verbose = &profile->preference.learning_verbose;
 371                 goto set_verbose;
 372         }
 373         return;
 374  set_default:
 375         *pref = &tomoyo_default_profile.preference;
 376         return;
 377  set_verbose:
 378         tomoyo_set_bool(verbose, value, "verbose");
 379 }
 380
 381 static int tomoyo_set_mode(char *name, const char *value,
 382                            const bool use_default,
 383                            struct tomoyo_profile *profile)
 384 {
 385         u8 i;
 386         u8 config;
 387         if (!strcmp(name, "CONFIG")) {
 388                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 389                 config = profile->default_config;
 390         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 391                 config = 0;
 392                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 393                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 394                         if (strcmp(name, tomoyo_mac_keywords[i]))
 395                                 continue;
 396                         config = profile->config[i];
 397                         break;
 398                 }
 399                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 400                         return -EINVAL;
 401         } else {
 402                 return -EINVAL;
 403         }
 404         if (use_default) {
 405                 config = TOMOYO_CONFIG_USE_DEFAULT;
 406         } else {
 407                 u8 mode;
 408                 for (mode = 0; mode < 4; mode++)
 409                         if (strstr(value, tomoyo_mode[mode]))
 410                                 /*
 411                                  * Update lower 3 bits in order to distinguish
 412                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 413                                  */
 414                                 config = (config & ~7) | mode;
 415         }
 416         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 417                 profile->config[i] = config;
 418         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 419                 profile->default_config = config;
 420         return 0;
 421 }
 422
 423 /**
 424  * tomoyo_write_profile - Write profile table.
 425  *
 426  * @head: Pointer to "struct tomoyo_io_buffer".
 427  *
 428  * Returns 0 on success, negative value otherwise.
 429  */
 430 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 431 {
 432         char *data = head->write_buf;
 433         unsigned int i;
 434         bool use_default = false;
 435         char *cp;
 436         struct tomoyo_profile *profile;
 437         if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
 438                 return 0;
 439         i = simple_strtoul(data, &cp, 10);
 440         if (data == cp) {
 441                 profile = &tomoyo_default_profile;
 442         } else {
 443                 if (*cp != '-')
 444                         return -EINVAL;
 445                 data = cp + 1;
 446                 profile = tomoyo_find_or_assign_new_profile(i);
 447                 if (!profile)
 448                         return -EINVAL;
 449         }
 450         cp = strchr(data, '=');
 451         if (!cp)
 452                 return -EINVAL;
 453         *cp++ = '\0';
 454         if (profile != &tomoyo_default_profile)
 455                 use_default = strstr(cp, "use_default") != NULL;
 456         if (tomoyo_str_starts(&data, "PREFERENCE::")) {
 457                 tomoyo_set_pref(data, cp, use_default, profile);
 458                 return 0;
 459         }
 460         if (profile == &tomoyo_default_profile)
 461                 return -EINVAL;
 462         if (!strcmp(data, "COMMENT")) {
 463                 const struct tomoyo_path_info *old_comment = profile->comment;
 464                 profile->comment = tomoyo_get_name(cp);
 465                 tomoyo_put_name(old_comment);
 466                 return 0;
 467         }
 468         return tomoyo_set_mode(data, cp, use_default, profile);
 469 }
 470
 471 static void tomoyo_print_preference(struct tomoyo_io_buffer *head,
 472                                     const int idx)
 473 {
 474         struct tomoyo_preference *pref = &tomoyo_default_profile.preference;
 475         const struct tomoyo_profile *profile = idx >= 0 ?
 476                 tomoyo_profile_ptr[idx] : NULL;
 477         char buffer[16] = "";
 478         if (profile) {
 479                 buffer[sizeof(buffer) - 1] = '\0';
 480                 snprintf(buffer, sizeof(buffer) - 1, "%u-", idx);
 481         }
 482         if (profile) {
 483                 pref = profile->learning;
 484                 if (pref == &tomoyo_default_profile.preference)
 485                         goto skip1;
 486         }
 487         tomoyo_io_printf(head, "%sPREFERENCE::%s={ "
 488                          "verbose=%s max_entry=%u }\n",
 489                          buffer, "learning",
 490                          tomoyo_yesno(pref->learning_verbose),
 491                          pref->learning_max_entry);
 492  skip1:
 493         if (profile) {
 494                 pref = profile->permissive;
 495                 if (pref == &tomoyo_default_profile.preference)
 496                         goto skip2;
 497         }
 498         tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
 499                          buffer, "permissive",
 500                          tomoyo_yesno(pref->permissive_verbose));
 501  skip2:
 502         if (profile) {
 503                 pref = profile->enforcing;
 504                 if (pref == &tomoyo_default_profile.preference)
 505                         return;
 506         }
 507         tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
 508                          buffer, "enforcing",
 509                          tomoyo_yesno(pref->enforcing_verbose));
 510 }
 511
 512 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 513 {
 514         tomoyo_io_printf(head, "={ mode=%s }\n", tomoyo_mode[config & 3]);
 515 }
 516
 517 /**
 518  * tomoyo_read_profile - Read profile table.
 519  *
 520  * @head: Pointer to "struct tomoyo_io_buffer".
 521  */
 522 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 523 {
 524         u8 index;
 525         const struct tomoyo_profile *profile;
 526  next:
 527         index = head->r.index;
 528         profile = tomoyo_profile_ptr[index];
 529         switch (head->r.step) {
 530         case 0:
 531                 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
 532                 tomoyo_print_preference(head, -1);
 533                 head->r.step++;
 534                 break;
 535         case 1:
 536                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 537                       head->r.index++)
 538                         if (tomoyo_profile_ptr[head->r.index])
 539                                 break;
 540                 if (head->r.index == TOMOYO_MAX_PROFILES)
 541                         return;
 542                 head->r.step++;
 543                 break;
 544         case 2:
 545                 {
 546                         const struct tomoyo_path_info *comment =
 547                                 profile->comment;
 548                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 549                         tomoyo_set_string(head, comment ? comment->name : "");
 550                         tomoyo_set_lf(head);
 551                         head->r.step++;
 552                 }
 553                 break;
 554         case 3:
 555                 {
 556                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 557                         tomoyo_print_config(head, profile->default_config);
 558                         head->r.bit = 0;
 559                         head->r.step++;
 560                 }
 561                 break;
 562         case 4:
 563                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 564                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 565                         const u8 i = head->r.bit;
 566                         const u8 config = profile->config[i];
 567                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 568                                 continue;
 569                         tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::",
 570                                          tomoyo_mac_keywords[i]);
 571                         tomoyo_print_config(head, config);
 572                         head->r.bit++;
 573                         break;
 574                 }
 575                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 576                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 577                         tomoyo_print_preference(head, index);
 578                         head->r.index++;
 579                         head->r.step = 1;
 580                 }
 581                 break;
 582         }
 583         if (tomoyo_flush(head))
 584                 goto next;
 585 }
 586
 587 static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a,
 588                                       const struct tomoyo_acl_head *b)
 589 {
 590         return container_of(a, struct tomoyo_policy_manager_entry, head)
 591                 ->manager ==
 592                 container_of(b, struct tomoyo_policy_manager_entry, head)
 593                 ->manager;
 594 }
 595
 596 /**
 597  * tomoyo_update_manager_entry - Add a manager entry.
 598  *
 599  * @manager:   The path to manager or the domainnamme.
 600  * @is_delete: True if it is a delete request.
 601  *
 602  * Returns 0 on success, negative value otherwise.
 603  *
 604  * Caller holds tomoyo_read_lock().
 605  */
 606 static int tomoyo_update_manager_entry(const char *manager,
 607                                        const bool is_delete)
 608 {
 609         struct tomoyo_policy_manager_entry e = { };
 610         int error;
 611
 612         if (tomoyo_domain_def(manager)) {
 613                 if (!tomoyo_correct_domain(manager))
 614                         return -EINVAL;
 615                 e.is_domain = true;
 616         } else {
 617                 if (!tomoyo_correct_path(manager))
 618                         return -EINVAL;
 619         }
 620         e.manager = tomoyo_get_name(manager);
 621         if (!e.manager)
 622                 return -ENOMEM;
 623         error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
 624                                      &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 625                                      tomoyo_same_manager_entry);
 626         tomoyo_put_name(e.manager);
 627         return error;
 628 }
 629
 630 /**
 631  * tomoyo_write_manager_policy - Write manager policy.
 632  *
 633  * @head: Pointer to "struct tomoyo_io_buffer".
 634  *
 635  * Returns 0 on success, negative value otherwise.
 636  *
 637  * Caller holds tomoyo_read_lock().
 638  */
 639 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
 640 {
 641         char *data = head->write_buf;
 642         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
 643
 644         if (!strcmp(data, "manage_by_non_root")) {
 645                 tomoyo_manage_by_non_root = !is_delete;
 646                 return 0;
 647         }
 648         return tomoyo_update_manager_entry(data, is_delete);
 649 }
 650
 651 /**
 652  * tomoyo_read_manager_policy - Read manager policy.
 653  *
 654  * @head: Pointer to "struct tomoyo_io_buffer".
 655  *
 656  * Caller holds tomoyo_read_lock().
 657  */
 658 static void tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
 659 {
 660         if (head->r.eof)
 661                 return;
 662         list_for_each_cookie(head->r.acl,
 663                              &tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
 664                 struct tomoyo_policy_manager_entry *ptr =
 665                         list_entry(head->r.acl, typeof(*ptr), head.list);
 666                 if (ptr->head.is_deleted)
 667                         continue;
 668                 if (!tomoyo_flush(head))
 669                         return;
 670                 tomoyo_set_string(head, ptr->manager->name);
 671                 tomoyo_set_lf(head);
 672         }
 673         head->r.eof = true;
 674 }
 675
 676 /**
 677  * tomoyo_policy_manager - Check whether the current process is a policy manager.
 678  *
 679  * Returns true if the current process is permitted to modify policy
 680  * via /sys/kernel/security/tomoyo/ interface.
 681  *
 682  * Caller holds tomoyo_read_lock().
 683  */
 684 static bool tomoyo_policy_manager(void)
 685 {
 686         struct tomoyo_policy_manager_entry *ptr;
 687         const char *exe;
 688         const struct task_struct *task = current;
 689         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 690         bool found = false;
 691
 692         if (!tomoyo_policy_loaded)
 693                 return true;
 694         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 695                 return false;
 696         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 697                                 head.list) {
 698                 if (!ptr->head.is_deleted && ptr->is_domain
 699                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 700                         found = true;
 701                         break;
 702                 }
 703         }
 704         if (found)
 705                 return true;
 706         exe = tomoyo_get_exe();
 707         if (!exe)
 708                 return false;
 709         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 710                                 head.list) {
 711                 if (!ptr->head.is_deleted && !ptr->is_domain
 712                     && !strcmp(exe, ptr->manager->name)) {
 713                         found = true;
 714                         break;
 715                 }
 716         }
 717         if (!found) { /* Reduce error messages. */
 718                 static pid_t last_pid;
 719                 const pid_t pid = current->pid;
 720                 if (last_pid != pid) {
 721                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 722                                "update policies.\n", domainname->name, exe);
 723                         last_pid = pid;
 724                 }
 725         }
 726         kfree(exe);
 727         return found;
 728 }
 729
 730 /**
 731  * tomoyo_select_one - Parse select command.
 732  *
 733  * @head: Pointer to "struct tomoyo_io_buffer".
 734  * @data: String to parse.
 735  *
 736  * Returns true on success, false otherwise.
 737  *
 738  * Caller holds tomoyo_read_lock().
 739  */
 740 static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
 741 {
 742         unsigned int pid;
 743         struct tomoyo_domain_info *domain = NULL;
 744         bool global_pid = false;
 745
 746         if (!strcmp(data, "allow_execute")) {
 747                 head->r.print_execute_only = true;
 748                 return true;
 749         }
 750         if (sscanf(data, "pid=%u", &pid) == 1 ||
 751             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 752                 struct task_struct *p;
 753                 rcu_read_lock();
 754                 read_lock(&tasklist_lock);
 755                 if (global_pid)
 756                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 757                 else
 758                         p = find_task_by_vpid(pid);
 759                 if (p)
 760                         domain = tomoyo_real_domain(p);
 761                 read_unlock(&tasklist_lock);
 762                 rcu_read_unlock();
 763         } else if (!strncmp(data, "domain=", 7)) {
 764                 if (tomoyo_domain_def(data + 7))
 765                         domain = tomoyo_find_domain(data + 7);
 766         } else
 767                 return false;
 768         head->write_var1 = domain;
 769         /* Accessing read_buf is safe because head->io_sem is held. */
 770         if (!head->read_buf)
 771                 return true; /* Do nothing if open(O_WRONLY). */
 772         memset(&head->r, 0, sizeof(head->r));
 773         head->r.print_this_domain_only = true;
 774         head->r.eof = !domain;
 775         head->r.domain = &domain->list;
 776         tomoyo_io_printf(head, "# select %s\n", data);
 777         if (domain && domain->is_deleted)
 778                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 779         return true;
 780 }
 781
 782 /**
 783  * tomoyo_delete_domain - Delete a domain.
 784  *
 785  * @domainname: The name of domain.
 786  *
 787  * Returns 0.
 788  *
 789  * Caller holds tomoyo_read_lock().
 790  */
 791 static int tomoyo_delete_domain(char *domainname)
 792 {
 793         struct tomoyo_domain_info *domain;
 794         struct tomoyo_path_info name;
 795
 796         name.name = domainname;
 797         tomoyo_fill_path_info(&name);
 798         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 799                 return 0;
 800         /* Is there an active domain? */
 801         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 802                 /* Never delete tomoyo_kernel_domain */
 803                 if (domain == &tomoyo_kernel_domain)
 804                         continue;
 805                 if (domain->is_deleted ||
 806                     tomoyo_pathcmp(domain->domainname, &name))
 807                         continue;
 808                 domain->is_deleted = true;
 809                 break;
 810         }
 811         mutex_unlock(&tomoyo_policy_lock);
 812         return 0;
 813 }
 814
 815 /**
 816  * tomoyo_write_domain_policy2 - Write domain policy.
 817  *
 818  * @head: Pointer to "struct tomoyo_io_buffer".
 819  *
 820  * Returns 0 on success, negative value otherwise.
 821  *
 822  * Caller holds tomoyo_read_lock().
 823  */
 824 static int tomoyo_write_domain_policy2(char *data,
 825                                        struct tomoyo_domain_info *domain,
 826                                        const bool is_delete)
 827 {
 828         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
 829                 return tomoyo_write_mount_policy(data, domain, is_delete);
 830         return tomoyo_write_file_policy(data, domain, is_delete);
 831 }
 832
 833 /**
 834  * tomoyo_write_domain_policy - Write domain policy.
 835  *
 836  * @head: Pointer to "struct tomoyo_io_buffer".
 837  *
 838  * Returns 0 on success, negative value otherwise.
 839  *
 840  * Caller holds tomoyo_read_lock().
 841  */
 842 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
 843 {
 844         char *data = head->write_buf;
 845         struct tomoyo_domain_info *domain = head->write_var1;
 846         bool is_delete = false;
 847         bool is_select = false;
 848         unsigned int profile;
 849
 850         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
 851                 is_delete = true;
 852         else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
 853                 is_select = true;
 854         if (is_select && tomoyo_select_one(head, data))
 855                 return 0;
 856         /* Don't allow updating policies by non manager programs. */
 857         if (!tomoyo_policy_manager())
 858                 return -EPERM;
 859         if (tomoyo_domain_def(data)) {
 860                 domain = NULL;
 861                 if (is_delete)
 862                         tomoyo_delete_domain(data);
 863                 else if (is_select)
 864                         domain = tomoyo_find_domain(data);
 865                 else
 866                         domain = tomoyo_find_or_assign_new_domain(data, 0);
 867                 head->write_var1 = domain;
 868                 return 0;
 869         }
 870         if (!domain)
 871                 return -EINVAL;
 872
 873         if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
 874             && profile < TOMOYO_MAX_PROFILES) {
 875                 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
 876                         domain->profile = (u8) profile;
 877                 return 0;
 878         }
 879         if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
 880                 domain->ignore_global_allow_read = !is_delete;
 881                 return 0;
 882         }
 883         if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
 884                 domain->quota_warned = !is_delete;
 885                 return 0;
 886         }
 887         if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
 888                 domain->transition_failed = !is_delete;
 889                 return 0;
 890         }
 891         return tomoyo_write_domain_policy2(data, domain, is_delete);
 892 }
 893
 894 /**
 895  * tomoyo_fns - Find next set bit.
 896  *
 897  * @perm: 8 bits value.
 898  * @bit:  First bit to find.
 899  *
 900  * Returns next on-bit on success, 8 otherwise.
 901  */
 902 static u8 tomoyo_fns(const u8 perm, u8 bit)
 903 {
 904         for ( ; bit < 8; bit++)
 905                 if (perm & (1 << bit))
 906                         break;
 907         return bit;
 908 }
 909
 910 /**
 911  * tomoyo_print_entry - Print an ACL entry.
 912  *
 913  * @head: Pointer to "struct tomoyo_io_buffer".
 914  * @acl:  Pointer to an ACL entry.
 915  *
 916  * Returns true on success, false otherwise.
 917  */
 918 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
 919                                struct tomoyo_acl_info *acl)
 920 {
 921         const u8 acl_type = acl->type;
 922         u8 bit;
 923
 924         if (acl->is_deleted)
 925                 return true;
 926  next:
 927         bit = head->r.bit;
 928         if (!tomoyo_flush(head))
 929                 return false;
 930         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
 931                 struct tomoyo_path_acl *ptr =
 932                         container_of(acl, typeof(*ptr), head);
 933                 const u16 perm = ptr->perm;
 934                 for ( ; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
 935                         if (!(perm & (1 << bit)))
 936                                 continue;
 937                         if (head->r.print_execute_only &&
 938                             bit != TOMOYO_TYPE_EXECUTE)
 939                                 continue;
 940                         /* Print "read/write" instead of "read" and "write". */
 941                         if ((bit == TOMOYO_TYPE_READ ||
 942                              bit == TOMOYO_TYPE_WRITE)
 943                             && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
 944                                 continue;
 945                         break;
 946                 }
 947                 if (bit >= TOMOYO_MAX_PATH_OPERATION)
 948                         goto done;
 949                 tomoyo_io_printf(head, "allow_%s", tomoyo_path_keyword[bit]);
 950                 tomoyo_print_name_union(head, &ptr->name);
 951         } else if (head->r.print_execute_only) {
 952                 return true;
 953         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
 954                 struct tomoyo_path2_acl *ptr =
 955                         container_of(acl, typeof(*ptr), head);
 956                 bit = tomoyo_fns(ptr->perm, bit);
 957                 if (bit >= TOMOYO_MAX_PATH2_OPERATION)
 958                         goto done;
 959                 tomoyo_io_printf(head, "allow_%s", tomoyo_path2_keyword[bit]);
 960                 tomoyo_print_name_union(head, &ptr->name1);
 961                 tomoyo_print_name_union(head, &ptr->name2);
 962         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
 963                 struct tomoyo_path_number_acl *ptr =
 964                         container_of(acl, typeof(*ptr), head);
 965                 bit = tomoyo_fns(ptr->perm, bit);
 966                 if (bit >= TOMOYO_MAX_PATH_NUMBER_OPERATION)
 967                         goto done;
 968                 tomoyo_io_printf(head, "allow_%s",
 969                                  tomoyo_path_number_keyword[bit]);
 970                 tomoyo_print_name_union(head, &ptr->name);
 971                 tomoyo_print_number_union(head, &ptr->number);
 972         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
 973                 struct tomoyo_mkdev_acl *ptr =
 974                         container_of(acl, typeof(*ptr), head);
 975                 bit = tomoyo_fns(ptr->perm, bit);
 976                 if (bit >= TOMOYO_MAX_MKDEV_OPERATION)
 977                         goto done;
 978                 tomoyo_io_printf(head, "allow_%s", tomoyo_mkdev_keyword[bit]);
 979                 tomoyo_print_name_union(head, &ptr->name);
 980                 tomoyo_print_number_union(head, &ptr->mode);
 981                 tomoyo_print_number_union(head, &ptr->major);
 982                 tomoyo_print_number_union(head, &ptr->minor);
 983         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
 984                 struct tomoyo_mount_acl *ptr =
 985                         container_of(acl, typeof(*ptr), head);
 986                 tomoyo_io_printf(head, "allow_mount");
 987                 tomoyo_print_name_union(head, &ptr->dev_name);
 988                 tomoyo_print_name_union(head, &ptr->dir_name);
 989                 tomoyo_print_name_union(head, &ptr->fs_type);
 990                 tomoyo_print_number_union(head, &ptr->flags);
 991         }
 992         head->r.bit = bit + 1;
 993         tomoyo_io_printf(head, "\n");
 994         if (acl_type != TOMOYO_TYPE_MOUNT_ACL)
 995                 goto next;
 996  done:
 997         head->r.bit = 0;
 998         return true;
 999 }
1000
1001 /**
1002  * tomoyo_read_domain2 - Read domain policy.
1003  *
1004  * @head:   Pointer to "struct tomoyo_io_buffer".
1005  * @domain: Pointer to "struct tomoyo_domain_info".
1006  *
1007  * Caller holds tomoyo_read_lock().
1008  *
1009  * Returns true on success, false otherwise.
1010  */
1011 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1012                                 struct tomoyo_domain_info *domain)
1013 {
1014         list_for_each_cookie(head->r.acl, &domain->acl_info_list) {
1015                 struct tomoyo_acl_info *ptr =
1016                         list_entry(head->r.acl, typeof(*ptr), list);
1017                 if (!tomoyo_print_entry(head, ptr))
1018                         return false;
1019         }
1020         head->r.acl = NULL;
1021         return true;
1022 }
1023
1024 /**
1025  * tomoyo_read_domain_policy - Read domain policy.
1026  *
1027  * @head: Pointer to "struct tomoyo_io_buffer".
1028  *
1029  * Caller holds tomoyo_read_lock().
1030  */
1031 static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1032 {
1033         if (head->r.eof)
1034                 return;
1035         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1036                 struct tomoyo_domain_info *domain =
1037                         list_entry(head->r.domain, typeof(*domain), list);
1038                 switch (head->r.step) {
1039                 case 0:
1040                         if (domain->is_deleted &&
1041                             !head->r.print_this_domain_only)
1042                                 continue;
1043                         /* Print domainname and flags. */
1044                         tomoyo_set_string(head, domain->domainname->name);
1045                         tomoyo_set_lf(head);
1046                         tomoyo_io_printf(head,
1047                                          TOMOYO_KEYWORD_USE_PROFILE "%u\n",
1048                                          domain->profile);
1049                         if (domain->quota_warned)
1050                                 tomoyo_set_string(head, "quota_exceeded\n");
1051                         if (domain->transition_failed)
1052                                 tomoyo_set_string(head, "transition_failed\n");
1053                         if (domain->ignore_global_allow_read)
1054                                 tomoyo_set_string(head,
1055                                        TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ
1056                                                   "\n");
1057                         head->r.step++;
1058                         tomoyo_set_lf(head);
1059                         /* fall through */
1060                 case 1:
1061                         if (!tomoyo_read_domain2(head, domain))
1062                                 return;
1063                         head->r.step++;
1064                         if (!tomoyo_set_lf(head))
1065                                 return;
1066                         /* fall through */
1067                 case 2:
1068                         head->r.step = 0;
1069                         if (head->r.print_this_domain_only)
1070                                 goto done;
1071                 }
1072         }
1073  done:
1074         head->r.eof = true;
1075 }
1076
1077 /**
1078  * tomoyo_write_domain_profile - Assign profile for specified domain.
1079  *
1080  * @head: Pointer to "struct tomoyo_io_buffer".
1081  *
1082  * Returns 0 on success, -EINVAL otherwise.
1083  *
1084  * This is equivalent to doing
1085  *
1086  *     ( echo "select " $domainname; echo "use_profile " $profile ) |
1087  *     /usr/sbin/tomoyo-loadpolicy -d
1088  *
1089  * Caller holds tomoyo_read_lock().
1090  */
1091 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1092 {
1093         char *data = head->write_buf;
1094         char *cp = strchr(data, ' ');
1095         struct tomoyo_domain_info *domain;
1096         unsigned long profile;
1097
1098         if (!cp)
1099                 return -EINVAL;
1100         *cp = '\0';
1101         domain = tomoyo_find_domain(cp + 1);
1102         if (strict_strtoul(data, 10, &profile))
1103                 return -EINVAL;
1104         if (domain && profile < TOMOYO_MAX_PROFILES
1105             && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1106                 domain->profile = (u8) profile;
1107         return 0;
1108 }
1109
1110 /**
1111  * tomoyo_read_domain_profile - Read only domainname and profile.
1112  *
1113  * @head: Pointer to "struct tomoyo_io_buffer".
1114  *
1115  * Returns list of profile number and domainname pairs.
1116  *
1117  * This is equivalent to doing
1118  *
1119  *     grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1120  *     awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1121  *     domainname = $0; } else if ( $1 == "use_profile" ) {
1122  *     print $2 " " domainname; domainname = ""; } } ; '
1123  *
1124  * Caller holds tomoyo_read_lock().
1125  */
1126 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1127 {
1128         if (head->r.eof)
1129                 return;
1130         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1131                 struct tomoyo_domain_info *domain =
1132                         list_entry(head->r.domain, typeof(*domain), list);
1133                 if (domain->is_deleted)
1134                         continue;
1135                 if (!tomoyo_flush(head))
1136                         return;
1137                 tomoyo_io_printf(head, "%u ", domain->profile);
1138                 tomoyo_set_string(head, domain->domainname->name);
1139                 tomoyo_set_lf(head);
1140         }
1141         head->r.eof = true;
1142 }
1143
1144 /**
1145  * tomoyo_write_pid: Specify PID to obtain domainname.
1146  *
1147  * @head: Pointer to "struct tomoyo_io_buffer".
1148  *
1149  * Returns 0.
1150  */
1151 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1152 {
1153         head->r.eof = false;
1154         return 0;
1155 }
1156
1157 /**
1158  * tomoyo_read_pid - Get domainname of the specified PID.
1159  *
1160  * @head: Pointer to "struct tomoyo_io_buffer".
1161  *
1162  * Returns the domainname which the specified PID is in on success,
1163  * empty string otherwise.
1164  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1165  * using read()/write() interface rather than sysctl() interface.
1166  */
1167 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1168 {
1169         char *buf = head->write_buf;
1170         bool global_pid = false;
1171         unsigned int pid;
1172         struct task_struct *p;
1173         struct tomoyo_domain_info *domain = NULL;
1174
1175         /* Accessing write_buf is safe because head->io_sem is held. */
1176         if (!buf) {
1177                 head->r.eof = true;
1178                 return; /* Do nothing if open(O_RDONLY). */
1179         }
1180         if (head->r.w_pos || head->r.eof)
1181                 return;
1182         head->r.eof = true;
1183         if (tomoyo_str_starts(&buf, "global-pid "))
1184                 global_pid = true;
1185         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1186         rcu_read_lock();
1187         read_lock(&tasklist_lock);
1188         if (global_pid)
1189                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1190         else
1191                 p = find_task_by_vpid(pid);
1192         if (p)
1193                 domain = tomoyo_real_domain(p);
1194         read_unlock(&tasklist_lock);
1195         rcu_read_unlock();
1196         if (!domain)
1197                 return;
1198         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1199         tomoyo_set_string(head, domain->domainname->name);
1200 }
1201
1202 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1203         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE]
1204         = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN,
1205         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]
1206         = TOMOYO_KEYWORD_INITIALIZE_DOMAIN,
1207         [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN,
1208         [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN
1209 };
1210
1211 /**
1212  * tomoyo_write_exception_policy - Write exception policy.
1213  *
1214  * @head: Pointer to "struct tomoyo_io_buffer".
1215  *
1216  * Returns 0 on success, negative value otherwise.
1217  *
1218  * Caller holds tomoyo_read_lock().
1219  */
1220 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1221 {
1222         char *data = head->write_buf;
1223         bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1224         u8 i;
1225
1226         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) {
1227                 if (tomoyo_str_starts(&data, tomoyo_transition_type[i]))
1228                         return tomoyo_write_transition_control(data, is_delete,
1229                                                                i);
1230         }
1231         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
1232                 return tomoyo_write_aggregator_policy(data, is_delete);
1233         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1234                 return tomoyo_write_globally_readable_policy(data, is_delete);
1235         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1236                 return tomoyo_write_pattern_policy(data, is_delete);
1237         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1238                 return tomoyo_write_no_rewrite_policy(data, is_delete);
1239         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1240                 return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP);
1241         if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1242                 return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP);
1243         return -EINVAL;
1244 }
1245
1246 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1247         [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP,
1248         [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP
1249 };
1250
1251 /**
1252  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1253  *
1254  * @head: Pointer to "struct tomoyo_io_buffer".
1255  * @idx:  Index number.
1256  *
1257  * Returns true on success, false otherwise.
1258  *
1259  * Caller holds tomoyo_read_lock().
1260  */
1261 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1262 {
1263         list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
1264                 struct tomoyo_group *group =
1265                         list_entry(head->r.group, typeof(*group), list);
1266                 list_for_each_cookie(head->r.acl, &group->member_list) {
1267                         struct tomoyo_acl_head *ptr =
1268                                 list_entry(head->r.acl, typeof(*ptr), list);
1269                         if (ptr->is_deleted)
1270                                 continue;
1271                         if (!tomoyo_flush(head))
1272                                 return false;
1273                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1274                         tomoyo_set_string(head, group->group_name->name);
1275                         if (idx == TOMOYO_PATH_GROUP) {
1276                                 tomoyo_set_space(head);
1277                                 tomoyo_set_string(head, container_of
1278                                                (ptr, struct tomoyo_path_group,
1279                                                 head)->member_name->name);
1280                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1281                                 tomoyo_print_number_union(head, &container_of
1282                                                           (ptr,
1283                                                    struct tomoyo_number_group,
1284                                                            head)->number);
1285                         }
1286                         tomoyo_set_lf(head);
1287                 }
1288                 head->r.acl = NULL;
1289         }
1290         head->r.group = NULL;
1291         return true;
1292 }
1293
1294 /**
1295  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1296  *
1297  * @head: Pointer to "struct tomoyo_io_buffer".
1298  * @idx:  Index number.
1299  *
1300  * Returns true on success, false otherwise.
1301  *
1302  * Caller holds tomoyo_read_lock().
1303  */
1304 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1305 {
1306         list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) {
1307                 struct tomoyo_acl_head *acl =
1308                         container_of(head->r.acl, typeof(*acl), list);
1309                 if (acl->is_deleted)
1310                         continue;
1311                 if (!tomoyo_flush(head))
1312                         return false;
1313                 switch (idx) {
1314                 case TOMOYO_ID_TRANSITION_CONTROL:
1315                         {
1316                                 struct tomoyo_transition_control *ptr =
1317                                         container_of(acl, typeof(*ptr), head);
1318                                 tomoyo_set_string(head,
1319                                                   tomoyo_transition_type
1320                                                   [ptr->type]);
1321                                 if (ptr->program)
1322                                         tomoyo_set_string(head,
1323                                                           ptr->program->name);
1324                                 if (ptr->program && ptr->domainname)
1325                                         tomoyo_set_string(head, " from ");
1326                                 if (ptr->domainname)
1327                                         tomoyo_set_string(head,
1328                                                           ptr->domainname->
1329                                                           name);
1330                         }
1331                         break;
1332                 case TOMOYO_ID_GLOBALLY_READABLE:
1333                         {
1334                                 struct tomoyo_globally_readable_file_entry *ptr
1335                                         = container_of(acl, typeof(*ptr), head);
1336                                 tomoyo_set_string(head,
1337                                                   TOMOYO_KEYWORD_ALLOW_READ);
1338                                 tomoyo_set_string(head, ptr->filename->name);
1339                         }
1340                         break;
1341                 case TOMOYO_ID_AGGREGATOR:
1342                         {
1343                                 struct tomoyo_aggregator_entry *ptr =
1344                                         container_of(acl, typeof(*ptr), head);
1345                                 tomoyo_set_string(head,
1346                                                   TOMOYO_KEYWORD_AGGREGATOR);
1347                                 tomoyo_set_string(head,
1348                                                   ptr->original_name->name);
1349                                 tomoyo_set_space(head);
1350                                 tomoyo_set_string(head,
1351                                                ptr->aggregated_name->name);
1352                         }
1353                         break;
1354                 case TOMOYO_ID_PATTERN:
1355                         {
1356                                 struct tomoyo_pattern_entry *ptr =
1357                                         container_of(acl, typeof(*ptr), head);
1358                                 tomoyo_set_string(head,
1359                                                   TOMOYO_KEYWORD_FILE_PATTERN);
1360                                 tomoyo_set_string(head, ptr->pattern->name);
1361                         }
1362                         break;
1363                 case TOMOYO_ID_NO_REWRITE:
1364                         {
1365                                 struct tomoyo_no_rewrite_entry *ptr =
1366                                         container_of(acl, typeof(*ptr), head);
1367                                 tomoyo_set_string(head,
1368                                                   TOMOYO_KEYWORD_DENY_REWRITE);
1369                                 tomoyo_set_string(head, ptr->pattern->name);
1370                         }
1371                         break;
1372                 default:
1373                         continue;
1374                 }
1375                 tomoyo_set_lf(head);
1376         }
1377         head->r.acl = NULL;
1378         return true;
1379 }
1380
1381 /**
1382  * tomoyo_read_exception_policy - Read exception policy.
1383  *
1384  * @head: Pointer to "struct tomoyo_io_buffer".
1385  *
1386  * Caller holds tomoyo_read_lock().
1387  */
1388 static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1389 {
1390         if (head->r.eof)
1391                 return;
1392         while (head->r.step < TOMOYO_MAX_POLICY &&
1393                tomoyo_read_policy(head, head->r.step))
1394                 head->r.step++;
1395         if (head->r.step < TOMOYO_MAX_POLICY)
1396                 return;
1397         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1398                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1399                 head->r.step++;
1400         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1401                 return;
1402         head->r.eof = true;
1403 }
1404
1405 /**
1406  * tomoyo_print_header - Get header line of audit log.
1407  *
1408  * @r: Pointer to "struct tomoyo_request_info".
1409  *
1410  * Returns string representation.
1411  *
1412  * This function uses kmalloc(), so caller must kfree() if this function
1413  * didn't return NULL.
1414  */
1415 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1416 {
1417         struct timeval tv;
1418         const pid_t gpid = task_pid_nr(current);
1419         static const int tomoyo_buffer_len = 4096;
1420         char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1421         if (!buffer)
1422                 return NULL;
1423         do_gettimeofday(&tv);
1424         snprintf(buffer, tomoyo_buffer_len - 1,
1425                  "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1426                  " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1427                  " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1428                  tv.tv_sec, r->profile, tomoyo_mode[r->mode], gpid,
1429                  (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1430                  current_uid(), current_gid(), current_euid(),
1431                  current_egid(), current_suid(), current_sgid(),
1432                  current_fsuid(), current_fsgid());
1433         return buffer;
1434 }
1435
1436 /**
1437  * tomoyo_init_audit_log - Allocate buffer for audit logs.
1438  *
1439  * @len: Required size.
1440  * @r:   Pointer to "struct tomoyo_request_info".
1441  *
1442  * Returns pointer to allocated memory.
1443  *
1444  * The @len is updated to add the header lines' size on success.
1445  *
1446  * This function uses kzalloc(), so caller must kfree() if this function
1447  * didn't return NULL.
1448  */
1449 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1450 {
1451         char *buf = NULL;
1452         const char *header;
1453         const char *domainname;
1454         if (!r->domain)
1455                 r->domain = tomoyo_domain();
1456         domainname = r->domain->domainname->name;
1457         header = tomoyo_print_header(r);
1458         if (!header)
1459                 return NULL;
1460         *len += strlen(domainname) + strlen(header) + 10;
1461         buf = kzalloc(*len, GFP_NOFS);
1462         if (buf)
1463                 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1464         kfree(header);
1465         return buf;
1466 }
1467
1468 /* Wait queue for tomoyo_query_list. */
1469 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1470
1471 /* Lock for manipulating tomoyo_query_list. */
1472 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1473
1474 /* Structure for query. */
1475 struct tomoyo_query_entry {
1476         struct list_head list;
1477         char *query;
1478         int query_len;
1479         unsigned int serial;
1480         int timer;
1481         int answer;
1482 };
1483
1484 /* The list for "struct tomoyo_query_entry". */
1485 static LIST_HEAD(tomoyo_query_list);
1486
1487 /*
1488  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1489  * interface.
1490  */
1491 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1492
1493 /**
1494  * tomoyo_supervisor - Ask for the supervisor's decision.
1495  *
1496  * @r:       Pointer to "struct tomoyo_request_info".
1497  * @fmt:     The printf()'s format string, followed by parameters.
1498  *
1499  * Returns 0 if the supervisor decided to permit the access request which
1500  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1501  * supervisor decided to retry the access request which violated the policy in
1502  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1503  */
1504 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1505 {
1506         va_list args;
1507         int error = -EPERM;
1508         int pos;
1509         int len;
1510         static unsigned int tomoyo_serial;
1511         struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1512         bool quota_exceeded = false;
1513         char *header;
1514         switch (r->mode) {
1515                 char *buffer;
1516         case TOMOYO_CONFIG_LEARNING:
1517                 if (!tomoyo_domain_quota_is_ok(r))
1518                         return 0;
1519                 va_start(args, fmt);
1520                 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1521                 va_end(args);
1522                 buffer = kmalloc(len, GFP_NOFS);
1523                 if (!buffer)
1524                         return 0;
1525                 va_start(args, fmt);
1526                 vsnprintf(buffer, len - 1, fmt, args);
1527                 va_end(args);
1528                 tomoyo_normalize_line(buffer);
1529                 tomoyo_write_domain_policy2(buffer, r->domain, false);
1530                 kfree(buffer);
1531                 /* fall through */
1532         case TOMOYO_CONFIG_PERMISSIVE:
1533                 return 0;
1534         }
1535         if (!r->domain)
1536                 r->domain = tomoyo_domain();
1537         if (!atomic_read(&tomoyo_query_observers))
1538                 return -EPERM;
1539         va_start(args, fmt);
1540         len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1541         va_end(args);
1542         header = tomoyo_init_audit_log(&len, r);
1543         if (!header)
1544                 goto out;
1545         tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1546         if (!tomoyo_query_entry)
1547                 goto out;
1548         tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1549         if (!tomoyo_query_entry->query)
1550                 goto out;
1551         len = ksize(tomoyo_query_entry->query);
1552         INIT_LIST_HEAD(&tomoyo_query_entry->list);
1553         spin_lock(&tomoyo_query_list_lock);
1554         if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1555             sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1556                 quota_exceeded = true;
1557         } else {
1558                 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1559                 tomoyo_query_entry->serial = tomoyo_serial++;
1560         }
1561         spin_unlock(&tomoyo_query_list_lock);
1562         if (quota_exceeded)
1563                 goto out;
1564         pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1565                        tomoyo_query_entry->serial, r->retry, header);
1566         kfree(header);
1567         header = NULL;
1568         va_start(args, fmt);
1569         vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1570         tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1571         va_end(args);
1572         spin_lock(&tomoyo_query_list_lock);
1573         list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1574         spin_unlock(&tomoyo_query_list_lock);
1575         /* Give 10 seconds for supervisor's opinion. */
1576         for (tomoyo_query_entry->timer = 0;
1577              atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1578              tomoyo_query_entry->timer++) {
1579                 wake_up(&tomoyo_query_wait);
1580                 set_current_state(TASK_INTERRUPTIBLE);
1581                 schedule_timeout(HZ / 10);
1582                 if (tomoyo_query_entry->answer)
1583                         break;
1584         }
1585         spin_lock(&tomoyo_query_list_lock);
1586         list_del(&tomoyo_query_entry->list);
1587         tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1588         spin_unlock(&tomoyo_query_list_lock);
1589         switch (tomoyo_query_entry->answer) {
1590         case 3: /* Asked to retry by administrator. */
1591                 error = TOMOYO_RETRY_REQUEST;
1592                 r->retry++;
1593                 break;
1594         case 1:
1595                 /* Granted by administrator. */
1596                 error = 0;
1597                 break;
1598         case 0:
1599                 /* Timed out. */
1600                 break;
1601         default:
1602                 /* Rejected by administrator. */
1603                 break;
1604         }
1605  out:
1606         if (tomoyo_query_entry)
1607                 kfree(tomoyo_query_entry->query);
1608         kfree(tomoyo_query_entry);
1609         kfree(header);
1610         return error;
1611 }
1612
1613 /**
1614  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1615  *
1616  * @file: Pointer to "struct file".
1617  * @wait: Pointer to "poll_table".
1618  *
1619  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1620  *
1621  * Waits for access requests which violated policy in enforcing mode.
1622  */
1623 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1624 {
1625         struct list_head *tmp;
1626         bool found = false;
1627         u8 i;
1628         for (i = 0; i < 2; i++) {
1629                 spin_lock(&tomoyo_query_list_lock);
1630                 list_for_each(tmp, &tomoyo_query_list) {
1631                         struct tomoyo_query_entry *ptr
1632                                 = list_entry(tmp, struct tomoyo_query_entry,
1633                                              list);
1634                         if (ptr->answer)
1635                                 continue;
1636                         found = true;
1637                         break;
1638                 }
1639                 spin_unlock(&tomoyo_query_list_lock);
1640                 if (found)
1641                         return POLLIN | POLLRDNORM;
1642                 if (i)
1643                         break;
1644                 poll_wait(file, &tomoyo_query_wait, wait);
1645         }
1646         return 0;
1647 }
1648
1649 /**
1650  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1651  *
1652  * @head: Pointer to "struct tomoyo_io_buffer".
1653  */
1654 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1655 {
1656         struct list_head *tmp;
1657         int pos = 0;
1658         int len = 0;
1659         char *buf;
1660         if (head->r.w_pos)
1661                 return;
1662         if (head->read_buf) {
1663                 kfree(head->read_buf);
1664                 head->read_buf = NULL;
1665         }
1666         spin_lock(&tomoyo_query_list_lock);
1667         list_for_each(tmp, &tomoyo_query_list) {
1668                 struct tomoyo_query_entry *ptr =
1669                         list_entry(tmp, typeof(*ptr), list);
1670                 if (ptr->answer)
1671                         continue;
1672                 if (pos++ != head->r.query_index)
1673                         continue;
1674                 len = ptr->query_len;
1675                 break;
1676         }
1677         spin_unlock(&tomoyo_query_list_lock);
1678         if (!len) {
1679                 head->r.query_index = 0;
1680                 return;
1681         }
1682         buf = kzalloc(len, GFP_NOFS);
1683         if (!buf)
1684                 return;
1685         pos = 0;
1686         spin_lock(&tomoyo_query_list_lock);
1687         list_for_each(tmp, &tomoyo_query_list) {
1688                 struct tomoyo_query_entry *ptr =
1689                         list_entry(tmp, typeof(*ptr), list);
1690                 if (ptr->answer)
1691                         continue;
1692                 if (pos++ != head->r.query_index)
1693                         continue;
1694                 /*
1695                  * Some query can be skipped because tomoyo_query_list
1696                  * can change, but I don't care.
1697                  */
1698                 if (len == ptr->query_len)
1699                         memmove(buf, ptr->query, len);
1700                 break;
1701         }
1702         spin_unlock(&tomoyo_query_list_lock);
1703         if (buf[0]) {
1704                 head->read_buf = buf;
1705                 head->r.w[head->r.w_pos++] = buf;
1706                 head->r.query_index++;
1707         } else {
1708                 kfree(buf);
1709         }
1710 }
1711
1712 /**
1713  * tomoyo_write_answer - Write the supervisor's decision.
1714  *
1715  * @head: Pointer to "struct tomoyo_io_buffer".
1716  *
1717  * Returns 0 on success, -EINVAL otherwise.
1718  */
1719 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1720 {
1721         char *data = head->write_buf;
1722         struct list_head *tmp;
1723         unsigned int serial;
1724         unsigned int answer;
1725         spin_lock(&tomoyo_query_list_lock);
1726         list_for_each(tmp, &tomoyo_query_list) {
1727                 struct tomoyo_query_entry *ptr
1728                         = list_entry(tmp, struct tomoyo_query_entry, list);
1729                 ptr->timer = 0;
1730         }
1731         spin_unlock(&tomoyo_query_list_lock);
1732         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1733                 return -EINVAL;
1734         spin_lock(&tomoyo_query_list_lock);
1735         list_for_each(tmp, &tomoyo_query_list) {
1736                 struct tomoyo_query_entry *ptr
1737                         = list_entry(tmp, struct tomoyo_query_entry, list);
1738                 if (ptr->serial != serial)
1739                         continue;
1740                 if (!ptr->answer)
1741                         ptr->answer = answer;
1742                 break;
1743         }
1744         spin_unlock(&tomoyo_query_list_lock);
1745         return 0;
1746 }
1747
1748 /**
1749  * tomoyo_read_version: Get version.
1750  *
1751  * @head: Pointer to "struct tomoyo_io_buffer".
1752  *
1753  * Returns version information.
1754  */
1755 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1756 {
1757         if (!head->r.eof) {
1758                 tomoyo_io_printf(head, "2.3.0-pre");
1759                 head->r.eof = true;
1760         }
1761 }
1762
1763 /**
1764  * tomoyo_read_self_domain - Get the current process's domainname.
1765  *
1766  * @head: Pointer to "struct tomoyo_io_buffer".
1767  *
1768  * Returns the current process's domainname.
1769  */
1770 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1771 {
1772         if (!head->r.eof) {
1773                 /*
1774                  * tomoyo_domain()->domainname != NULL
1775                  * because every process belongs to a domain and
1776                  * the domain's name cannot be NULL.
1777                  */
1778                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1779                 head->r.eof = true;
1780         }
1781 }
1782
1783 /**
1784  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1785  *
1786  * @type: Type of interface.
1787  * @file: Pointer to "struct file".
1788  *
1789  * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1790  *
1791  * Caller acquires tomoyo_read_lock().
1792  */
1793 int tomoyo_open_control(const u8 type, struct file *file)
1794 {
1795         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1796
1797         if (!head)
1798                 return -ENOMEM;
1799         mutex_init(&head->io_sem);
1800         head->type = type;
1801         switch (type) {
1802         case TOMOYO_DOMAINPOLICY:
1803                 /* /sys/kernel/security/tomoyo/domain_policy */
1804                 head->write = tomoyo_write_domain_policy;
1805                 head->read = tomoyo_read_domain_policy;
1806                 break;
1807         case TOMOYO_EXCEPTIONPOLICY:
1808                 /* /sys/kernel/security/tomoyo/exception_policy */
1809                 head->write = tomoyo_write_exception_policy;
1810                 head->read = tomoyo_read_exception_policy;
1811                 break;
1812         case TOMOYO_SELFDOMAIN:
1813                 /* /sys/kernel/security/tomoyo/self_domain */
1814                 head->read = tomoyo_read_self_domain;
1815                 break;
1816         case TOMOYO_DOMAIN_STATUS:
1817                 /* /sys/kernel/security/tomoyo/.domain_status */
1818                 head->write = tomoyo_write_domain_profile;
1819                 head->read = tomoyo_read_domain_profile;
1820                 break;
1821         case TOMOYO_PROCESS_STATUS:
1822                 /* /sys/kernel/security/tomoyo/.process_status */
1823                 head->write = tomoyo_write_pid;
1824                 head->read = tomoyo_read_pid;
1825                 break;
1826         case TOMOYO_VERSION:
1827                 /* /sys/kernel/security/tomoyo/version */
1828                 head->read = tomoyo_read_version;
1829                 head->readbuf_size = 128;
1830                 break;
1831         case TOMOYO_MEMINFO:
1832                 /* /sys/kernel/security/tomoyo/meminfo */
1833                 head->write = tomoyo_write_memory_quota;
1834                 head->read = tomoyo_read_memory_counter;
1835                 head->readbuf_size = 512;
1836                 break;
1837         case TOMOYO_PROFILE:
1838                 /* /sys/kernel/security/tomoyo/profile */
1839                 head->write = tomoyo_write_profile;
1840                 head->read = tomoyo_read_profile;
1841                 break;
1842         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1843                 head->poll = tomoyo_poll_query;
1844                 head->write = tomoyo_write_answer;
1845                 head->read = tomoyo_read_query;
1846                 break;
1847         case TOMOYO_MANAGER:
1848                 /* /sys/kernel/security/tomoyo/manager */
1849                 head->write = tomoyo_write_manager_policy;
1850                 head->read = tomoyo_read_manager_policy;
1851                 break;
1852         }
1853         if (!(file->f_mode & FMODE_READ)) {
1854                 /*
1855                  * No need to allocate read_buf since it is not opened
1856                  * for reading.
1857                  */
1858                 head->read = NULL;
1859                 head->poll = NULL;
1860         } else if (!head->poll) {
1861                 /* Don't allocate read_buf for poll() access. */
1862                 if (!head->readbuf_size)
1863                         head->readbuf_size = 4096 * 2;
1864                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1865                 if (!head->read_buf) {
1866                         kfree(head);
1867                         return -ENOMEM;
1868                 }
1869         }
1870         if (!(file->f_mode & FMODE_WRITE)) {
1871                 /*
1872                  * No need to allocate write_buf since it is not opened
1873                  * for writing.
1874                  */
1875                 head->write = NULL;
1876         } else if (head->write) {
1877                 head->writebuf_size = 4096 * 2;
1878                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1879                 if (!head->write_buf) {
1880                         kfree(head->read_buf);
1881                         kfree(head);
1882                         return -ENOMEM;
1883                 }
1884         }
1885         if (type != TOMOYO_QUERY)
1886                 head->reader_idx = tomoyo_read_lock();
1887         file->private_data = head;
1888         /*
1889          * Call the handler now if the file is
1890          * /sys/kernel/security/tomoyo/self_domain
1891          * so that the user can use
1892          * cat < /sys/kernel/security/tomoyo/self_domain"
1893          * to know the current process's domainname.
1894          */
1895         if (type == TOMOYO_SELFDOMAIN)
1896                 tomoyo_read_control(file, NULL, 0);
1897         /*
1898          * If the file is /sys/kernel/security/tomoyo/query , increment the
1899          * observer counter.
1900          * The obserber counter is used by tomoyo_supervisor() to see if
1901          * there is some process monitoring /sys/kernel/security/tomoyo/query.
1902          */
1903         else if (type == TOMOYO_QUERY)
1904                 atomic_inc(&tomoyo_query_observers);
1905         return 0;
1906 }
1907
1908 /**
1909  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1910  *
1911  * @file: Pointer to "struct file".
1912  * @wait: Pointer to "poll_table".
1913  *
1914  * Waits for read readiness.
1915  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1916  */
1917 int tomoyo_poll_control(struct file *file, poll_table *wait)
1918 {
1919         struct tomoyo_io_buffer *head = file->private_data;
1920         if (!head->poll)
1921                 return -ENOSYS;
1922         return head->poll(file, wait);
1923 }
1924
1925 /**
1926  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1927  *
1928  * @file:       Pointer to "struct file".
1929  * @buffer:     Poiner to buffer to write to.
1930  * @buffer_len: Size of @buffer.
1931  *
1932  * Returns bytes read on success, negative value otherwise.
1933  *
1934  * Caller holds tomoyo_read_lock().
1935  */
1936 int tomoyo_read_control(struct file *file, char __user *buffer,
1937                         const int buffer_len)
1938 {
1939         int len;
1940         struct tomoyo_io_buffer *head = file->private_data;
1941
1942         if (!head->read)
1943                 return -ENOSYS;
1944         if (mutex_lock_interruptible(&head->io_sem))
1945                 return -EINTR;
1946         head->read_user_buf = buffer;
1947         head->read_user_buf_avail = buffer_len;
1948         if (tomoyo_flush(head))
1949                 /* Call the policy handler. */
1950                 head->read(head);
1951         tomoyo_flush(head);
1952         len = head->read_user_buf - buffer;
1953         mutex_unlock(&head->io_sem);
1954         return len;
1955 }
1956
1957 /**
1958  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1959  *
1960  * @file:       Pointer to "struct file".
1961  * @buffer:     Pointer to buffer to read from.
1962  * @buffer_len: Size of @buffer.
1963  *
1964  * Returns @buffer_len on success, negative value otherwise.
1965  *
1966  * Caller holds tomoyo_read_lock().
1967  */
1968 int tomoyo_write_control(struct file *file, const char __user *buffer,
1969                          const int buffer_len)
1970 {
1971         struct tomoyo_io_buffer *head = file->private_data;
1972         int error = buffer_len;
1973         int avail_len = buffer_len;
1974         char *cp0 = head->write_buf;
1975
1976         if (!head->write)
1977                 return -ENOSYS;
1978         if (!access_ok(VERIFY_READ, buffer, buffer_len))
1979                 return -EFAULT;
1980         /* Don't allow updating policies by non manager programs. */
1981         if (head->write != tomoyo_write_pid &&
1982             head->write != tomoyo_write_domain_policy &&
1983             !tomoyo_policy_manager())
1984                 return -EPERM;
1985         if (mutex_lock_interruptible(&head->io_sem))
1986                 return -EINTR;
1987         /* Read a line and dispatch it to the policy handler. */
1988         while (avail_len > 0) {
1989                 char c;
1990                 if (head->write_avail >= head->writebuf_size - 1) {
1991                         error = -ENOMEM;
1992                         break;
1993                 } else if (get_user(c, buffer)) {
1994                         error = -EFAULT;
1995                         break;
1996                 }
1997                 buffer++;
1998                 avail_len--;
1999                 cp0[head->write_avail++] = c;
2000                 if (c != '\n')
2001                         continue;
2002                 cp0[head->write_avail - 1] = '\0';
2003                 head->write_avail = 0;
2004                 tomoyo_normalize_line(cp0);
2005                 head->write(head);
2006         }
2007         mutex_unlock(&head->io_sem);
2008         return error;
2009 }
2010
2011 /**
2012  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2013  *
2014  * @file: Pointer to "struct file".
2015  *
2016  * Releases memory and returns 0.
2017  *
2018  * Caller looses tomoyo_read_lock().
2019  */
2020 int tomoyo_close_control(struct file *file)
2021 {
2022         struct tomoyo_io_buffer *head = file->private_data;
2023         const bool is_write = !!head->write_buf;
2024
2025         /*
2026          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2027          * observer counter.
2028          */
2029         if (head->type == TOMOYO_QUERY)
2030                 atomic_dec(&tomoyo_query_observers);
2031         else
2032                 tomoyo_read_unlock(head->reader_idx);
2033         /* Release memory used for policy I/O. */
2034         kfree(head->read_buf);
2035         head->read_buf = NULL;
2036         kfree(head->write_buf);
2037         head->write_buf = NULL;
2038         kfree(head);
2039         head = NULL;
2040         file->private_data = NULL;
2041         if (is_write)
2042                 tomoyo_run_gc();
2043         return 0;
2044 }
2045
2046 /**
2047  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2048  */
2049 void tomoyo_check_profile(void)
2050 {
2051         struct tomoyo_domain_info *domain;
2052         const int idx = tomoyo_read_lock();
2053         tomoyo_policy_loaded = true;
2054         /* Check all profiles currently assigned to domains are defined. */
2055         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2056                 const u8 profile = domain->profile;
2057                 if (tomoyo_profile_ptr[profile])
2058                         continue;
2059                 panic("Profile %u (used by '%s') not defined.\n",
2060                       profile, domain->domainname->name);
2061         }
2062         tomoyo_read_unlock(idx);
2063         if (tomoyo_profile_version != 20090903)
2064                 panic("Profile version %u is not supported.\n",
2065                       tomoyo_profile_version);
2066         printk(KERN_INFO "TOMOYO: 2.3.0-pre   2010/06/03\n");
2067         printk(KERN_INFO "Mandatory Access Control activated.\n");
2068 }