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_GETATTR]    = "file::getattr",
  43         [TOMOYO_MAC_FILE_MKDIR]      = "file::mkdir",
  44         [TOMOYO_MAC_FILE_RMDIR]      = "file::rmdir",
  45         [TOMOYO_MAC_FILE_MKFIFO]     = "file::mkfifo",
  46         [TOMOYO_MAC_FILE_MKSOCK]     = "file::mksock",
  47         [TOMOYO_MAC_FILE_TRUNCATE]   = "file::truncate",
  48         [TOMOYO_MAC_FILE_SYMLINK]    = "file::symlink",
  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::unmount",
  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                 head->r.w[0] = w;
 112                 if (*w)
 113                         return false;
 114                 /* Add '\0' for query. */
 115                 if (head->poll) {
 116                         if (!head->read_user_buf_avail ||
 117                             copy_to_user(head->read_user_buf, "", 1))
 118                                 return false;
 119                         head->read_user_buf_avail--;
 120                         head->read_user_buf++;
 121                 }
 122                 head->r.w_pos--;
 123                 for (len = 0; len < head->r.w_pos; len++)
 124                         head->r.w[len] = head->r.w[len + 1];
 125         }
 126         head->r.avail = 0;
 127         return true;
 128 }
 129
 130 /**
 131  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 132  *
 133  * @head:   Pointer to "struct tomoyo_io_buffer".
 134  * @string: String to print.
 135  *
 136  * Note that @string has to be kept valid until @head is kfree()d.
 137  * This means that char[] allocated on stack memory cannot be passed to
 138  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 139  */
 140 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 141 {
 142         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 143                 head->r.w[head->r.w_pos++] = string;
 144                 tomoyo_flush(head);
 145         } else
 146                 WARN_ON(1);
 147 }
 148
 149 /**
 150  * tomoyo_io_printf - 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 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 156 {
 157         va_list args;
 158         int len;
 159         int pos = head->r.avail;
 160         int size = head->readbuf_size - pos;
 161         if (size <= 0)
 162                 return;
 163         va_start(args, fmt);
 164         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 165         va_end(args);
 166         if (pos + len >= head->readbuf_size) {
 167                 WARN_ON(1);
 168                 return;
 169         }
 170         head->r.avail += len;
 171         tomoyo_set_string(head, head->read_buf + pos);
 172 }
 173
 174 /**
 175  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 176  *
 177  * @head: Pointer to "struct tomoyo_io_buffer".
 178  *
 179  * Returns nothing.
 180  */
 181 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 182 {
 183         tomoyo_set_string(head, " ");
 184 }
 185
 186 /**
 187  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 188  *
 189  * @head: Pointer to "struct tomoyo_io_buffer".
 190  *
 191  * Returns nothing.
 192  */
 193 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 194 {
 195         tomoyo_set_string(head, "\n");
 196         return !head->r.w_pos;
 197 }
 198
 199 /**
 200  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 201  *
 202  * @head: Pointer to "struct tomoyo_io_buffer".
 203  *
 204  * Returns nothing.
 205  */
 206 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 207 {
 208         tomoyo_set_string(head, "/");
 209 }
 210
 211 /**
 212  * tomoyo_print_name_union - Print a tomoyo_name_union.
 213  *
 214  * @head: Pointer to "struct tomoyo_io_buffer".
 215  * @ptr:  Pointer to "struct tomoyo_name_union".
 216  */
 217 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 218                                     const struct tomoyo_name_union *ptr)
 219 {
 220         tomoyo_set_space(head);
 221         if (ptr->group) {
 222                 tomoyo_set_string(head, "@");
 223                 tomoyo_set_string(head, ptr->group->group_name->name);
 224         } else {
 225                 tomoyo_set_string(head, ptr->filename->name);
 226         }
 227 }
 228
 229 /**
 230  * tomoyo_print_number_union - Print a tomoyo_number_union.
 231  *
 232  * @head:       Pointer to "struct tomoyo_io_buffer".
 233  * @ptr:        Pointer to "struct tomoyo_number_union".
 234  */
 235 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 236                                       const struct tomoyo_number_union *ptr)
 237 {
 238         tomoyo_set_space(head);
 239         if (ptr->group) {
 240                 tomoyo_set_string(head, "@");
 241                 tomoyo_set_string(head, ptr->group->group_name->name);
 242         } else {
 243                 int i;
 244                 unsigned long min = ptr->values[0];
 245                 const unsigned long max = ptr->values[1];
 246                 u8 min_type = ptr->value_type[0];
 247                 const u8 max_type = ptr->value_type[1];
 248                 char buffer[128];
 249                 buffer[0] = '\0';
 250                 for (i = 0; i < 2; i++) {
 251                         switch (min_type) {
 252                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 253                                 tomoyo_addprintf(buffer, sizeof(buffer),
 254                                                  "0x%lX", min);
 255                                 break;
 256                         case TOMOYO_VALUE_TYPE_OCTAL:
 257                                 tomoyo_addprintf(buffer, sizeof(buffer),
 258                                                  "0%lo", min);
 259                                 break;
 260                         default:
 261                                 tomoyo_addprintf(buffer, sizeof(buffer),
 262                                                  "%lu", min);
 263                                 break;
 264                         }
 265                         if (min == max && min_type == max_type)
 266                                 break;
 267                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 268                         min_type = max_type;
 269                         min = max;
 270                 }
 271                 tomoyo_io_printf(head, "%s", buffer);
 272         }
 273 }
 274
 275 /**
 276  * tomoyo_assign_profile - Create a new profile.
 277  *
 278  * @profile: Profile number to create.
 279  *
 280  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 281  */
 282 static struct tomoyo_profile *tomoyo_assign_profile(const unsigned int profile)
 283 {
 284         struct tomoyo_profile *ptr;
 285         struct tomoyo_profile *entry;
 286         if (profile >= TOMOYO_MAX_PROFILES)
 287                 return NULL;
 288         ptr = tomoyo_profile_ptr[profile];
 289         if (ptr)
 290                 return ptr;
 291         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 292         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 293                 goto out;
 294         ptr = tomoyo_profile_ptr[profile];
 295         if (!ptr && tomoyo_memory_ok(entry)) {
 296                 ptr = entry;
 297                 ptr->learning = &tomoyo_default_profile.preference;
 298                 ptr->permissive = &tomoyo_default_profile.preference;
 299                 ptr->enforcing = &tomoyo_default_profile.preference;
 300                 ptr->default_config = TOMOYO_CONFIG_DISABLED;
 301                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 302                        sizeof(ptr->config));
 303                 mb(); /* Avoid out-of-order execution. */
 304                 tomoyo_profile_ptr[profile] = ptr;
 305                 entry = NULL;
 306         }
 307         mutex_unlock(&tomoyo_policy_lock);
 308  out:
 309         kfree(entry);
 310         return ptr;
 311 }
 312
 313 /**
 314  * tomoyo_profile - Find a profile.
 315  *
 316  * @profile: Profile number to find.
 317  *
 318  * Returns pointer to "struct tomoyo_profile".
 319  */
 320 struct tomoyo_profile *tomoyo_profile(const u8 profile)
 321 {
 322         struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
 323         if (!tomoyo_policy_loaded)
 324                 return &tomoyo_default_profile;
 325         BUG_ON(!ptr);
 326         return ptr;
 327 }
 328
 329 static s8 tomoyo_find_yesno(const char *string, const char *find)
 330 {
 331         const char *cp = strstr(string, find);
 332         if (cp) {
 333                 cp += strlen(find);
 334                 if (!strncmp(cp, "=yes", 4))
 335                         return 1;
 336                 else if (!strncmp(cp, "=no", 3))
 337                         return 0;
 338         }
 339         return -1;
 340 }
 341
 342 static void tomoyo_set_bool(bool *b, const char *string, const char *find)
 343 {
 344         switch (tomoyo_find_yesno(string, find)) {
 345         case 1:
 346                 *b = true;
 347                 break;
 348         case 0:
 349                 *b = false;
 350                 break;
 351         }
 352 }
 353
 354 static void tomoyo_set_uint(unsigned int *i, const char *string,
 355                             const char *find)
 356 {
 357         const char *cp = strstr(string, find);
 358         if (cp)
 359                 sscanf(cp + strlen(find), "=%u", i);
 360 }
 361
 362 static void tomoyo_set_pref(const char *name, const char *value,
 363                             const bool use_default,
 364                             struct tomoyo_profile *profile)
 365 {
 366         struct tomoyo_preference **pref;
 367         bool *verbose;
 368         if (!strcmp(name, "enforcing")) {
 369                 if (use_default) {
 370                         pref = &profile->enforcing;
 371                         goto set_default;
 372                 }
 373                 profile->enforcing = &profile->preference;
 374                 verbose = &profile->preference.enforcing_verbose;
 375                 goto set_verbose;
 376         }
 377         if (!strcmp(name, "permissive")) {
 378                 if (use_default) {
 379                         pref = &profile->permissive;
 380                         goto set_default;
 381                 }
 382                 profile->permissive = &profile->preference;
 383                 verbose = &profile->preference.permissive_verbose;
 384                 goto set_verbose;
 385         }
 386         if (!strcmp(name, "learning")) {
 387                 if (use_default) {
 388                         pref = &profile->learning;
 389                         goto set_default;
 390                 }
 391                 profile->learning = &profile->preference;
 392                 tomoyo_set_uint(&profile->preference.learning_max_entry, value,
 393                              "max_entry");
 394                 verbose = &profile->preference.learning_verbose;
 395                 goto set_verbose;
 396         }
 397         return;
 398  set_default:
 399         *pref = &tomoyo_default_profile.preference;
 400         return;
 401  set_verbose:
 402         tomoyo_set_bool(verbose, value, "verbose");
 403 }
 404
 405 static int tomoyo_set_mode(char *name, const char *value,
 406                            const bool use_default,
 407                            struct tomoyo_profile *profile)
 408 {
 409         u8 i;
 410         u8 config;
 411         if (!strcmp(name, "CONFIG")) {
 412                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 413                 config = profile->default_config;
 414         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 415                 config = 0;
 416                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 417                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 418                         if (strcmp(name, tomoyo_mac_keywords[i]))
 419                                 continue;
 420                         config = profile->config[i];
 421                         break;
 422                 }
 423                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 424                         return -EINVAL;
 425         } else {
 426                 return -EINVAL;
 427         }
 428         if (use_default) {
 429                 config = TOMOYO_CONFIG_USE_DEFAULT;
 430         } else {
 431                 u8 mode;
 432                 for (mode = 0; mode < 4; mode++)
 433                         if (strstr(value, tomoyo_mode[mode]))
 434                                 /*
 435                                  * Update lower 3 bits in order to distinguish
 436                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 437                                  */
 438                                 config = (config & ~7) | mode;
 439         }
 440         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 441                 profile->config[i] = config;
 442         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 443                 profile->default_config = config;
 444         return 0;
 445 }
 446
 447 /**
 448  * tomoyo_write_profile - Write profile table.
 449  *
 450  * @head: Pointer to "struct tomoyo_io_buffer".
 451  *
 452  * Returns 0 on success, negative value otherwise.
 453  */
 454 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 455 {
 456         char *data = head->write_buf;
 457         unsigned int i;
 458         bool use_default = false;
 459         char *cp;
 460         struct tomoyo_profile *profile;
 461         if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
 462                 return 0;
 463         i = simple_strtoul(data, &cp, 10);
 464         if (data == cp) {
 465                 profile = &tomoyo_default_profile;
 466         } else {
 467                 if (*cp != '-')
 468                         return -EINVAL;
 469                 data = cp + 1;
 470                 profile = tomoyo_assign_profile(i);
 471                 if (!profile)
 472                         return -EINVAL;
 473         }
 474         cp = strchr(data, '=');
 475         if (!cp)
 476                 return -EINVAL;
 477         *cp++ = '\0';
 478         if (profile != &tomoyo_default_profile)
 479                 use_default = strstr(cp, "use_default") != NULL;
 480         if (tomoyo_str_starts(&data, "PREFERENCE::")) {
 481                 tomoyo_set_pref(data, cp, use_default, profile);
 482                 return 0;
 483         }
 484         if (profile == &tomoyo_default_profile)
 485                 return -EINVAL;
 486         if (!strcmp(data, "COMMENT")) {
 487                 static DEFINE_SPINLOCK(lock);
 488                 const struct tomoyo_path_info *new_comment
 489                         = tomoyo_get_name(cp);
 490                 const struct tomoyo_path_info *old_comment;
 491                 if (!new_comment)
 492                         return -ENOMEM;
 493                 spin_lock(&lock);
 494                 old_comment = profile->comment;
 495                 profile->comment = new_comment;
 496                 spin_unlock(&lock);
 497                 tomoyo_put_name(old_comment);
 498                 return 0;
 499         }
 500         return tomoyo_set_mode(data, cp, use_default, profile);
 501 }
 502
 503 static void tomoyo_print_preference(struct tomoyo_io_buffer *head,
 504                                     const int idx)
 505 {
 506         struct tomoyo_preference *pref = &tomoyo_default_profile.preference;
 507         const struct tomoyo_profile *profile = idx >= 0 ?
 508                 tomoyo_profile_ptr[idx] : NULL;
 509         char buffer[16] = "";
 510         if (profile) {
 511                 buffer[sizeof(buffer) - 1] = '\0';
 512                 snprintf(buffer, sizeof(buffer) - 1, "%u-", idx);
 513         }
 514         if (profile) {
 515                 pref = profile->learning;
 516                 if (pref == &tomoyo_default_profile.preference)
 517                         goto skip1;
 518         }
 519         tomoyo_io_printf(head, "%sPREFERENCE::%s={ "
 520                          "verbose=%s max_entry=%u }\n",
 521                          buffer, "learning",
 522                          tomoyo_yesno(pref->learning_verbose),
 523                          pref->learning_max_entry);
 524  skip1:
 525         if (profile) {
 526                 pref = profile->permissive;
 527                 if (pref == &tomoyo_default_profile.preference)
 528                         goto skip2;
 529         }
 530         tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
 531                          buffer, "permissive",
 532                          tomoyo_yesno(pref->permissive_verbose));
 533  skip2:
 534         if (profile) {
 535                 pref = profile->enforcing;
 536                 if (pref == &tomoyo_default_profile.preference)
 537                         return;
 538         }
 539         tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
 540                          buffer, "enforcing",
 541                          tomoyo_yesno(pref->enforcing_verbose));
 542 }
 543
 544 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 545 {
 546         tomoyo_io_printf(head, "={ mode=%s }\n", tomoyo_mode[config & 3]);
 547 }
 548
 549 /**
 550  * tomoyo_read_profile - Read profile table.
 551  *
 552  * @head: Pointer to "struct tomoyo_io_buffer".
 553  */
 554 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 555 {
 556         u8 index;
 557         const struct tomoyo_profile *profile;
 558  next:
 559         index = head->r.index;
 560         profile = tomoyo_profile_ptr[index];
 561         switch (head->r.step) {
 562         case 0:
 563                 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
 564                 tomoyo_print_preference(head, -1);
 565                 head->r.step++;
 566                 break;
 567         case 1:
 568                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 569                       head->r.index++)
 570                         if (tomoyo_profile_ptr[head->r.index])
 571                                 break;
 572                 if (head->r.index == TOMOYO_MAX_PROFILES)
 573                         return;
 574                 head->r.step++;
 575                 break;
 576         case 2:
 577                 {
 578                         const struct tomoyo_path_info *comment =
 579                                 profile->comment;
 580                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 581                         tomoyo_set_string(head, comment ? comment->name : "");
 582                         tomoyo_set_lf(head);
 583                         head->r.step++;
 584                 }
 585                 break;
 586         case 3:
 587                 {
 588                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 589                         tomoyo_print_config(head, profile->default_config);
 590                         head->r.bit = 0;
 591                         head->r.step++;
 592                 }
 593                 break;
 594         case 4:
 595                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 596                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 597                         const u8 i = head->r.bit;
 598                         const u8 config = profile->config[i];
 599                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 600                                 continue;
 601                         tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::",
 602                                          tomoyo_mac_keywords[i]);
 603                         tomoyo_print_config(head, config);
 604                         head->r.bit++;
 605                         break;
 606                 }
 607                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 608                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 609                         tomoyo_print_preference(head, index);
 610                         head->r.index++;
 611                         head->r.step = 1;
 612                 }
 613                 break;
 614         }
 615         if (tomoyo_flush(head))
 616                 goto next;
 617 }
 618
 619 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 620                                 const struct tomoyo_acl_head *b)
 621 {
 622         return container_of(a, struct tomoyo_manager, head)->manager ==
 623                 container_of(b, struct tomoyo_manager, head)->manager;
 624 }
 625
 626 /**
 627  * tomoyo_update_manager_entry - Add a manager entry.
 628  *
 629  * @manager:   The path to manager or the domainnamme.
 630  * @is_delete: True if it is a delete request.
 631  *
 632  * Returns 0 on success, negative value otherwise.
 633  *
 634  * Caller holds tomoyo_read_lock().
 635  */
 636 static int tomoyo_update_manager_entry(const char *manager,
 637                                        const bool is_delete)
 638 {
 639         struct tomoyo_manager e = { };
 640         struct tomoyo_acl_param param = {
 641                 .is_delete = is_delete,
 642                 .list = &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 643         };
 644         int error = is_delete ? -ENOENT : -ENOMEM;
 645         if (tomoyo_domain_def(manager)) {
 646                 if (!tomoyo_correct_domain(manager))
 647                         return -EINVAL;
 648                 e.is_domain = true;
 649         } else {
 650                 if (!tomoyo_correct_path(manager))
 651                         return -EINVAL;
 652         }
 653         e.manager = tomoyo_get_name(manager);
 654         if (e.manager) {
 655                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 656                                              tomoyo_same_manager);
 657                 tomoyo_put_name(e.manager);
 658         }
 659         return error;
 660 }
 661
 662 /**
 663  * tomoyo_write_manager - Write manager policy.
 664  *
 665  * @head: Pointer to "struct tomoyo_io_buffer".
 666  *
 667  * Returns 0 on success, negative value otherwise.
 668  *
 669  * Caller holds tomoyo_read_lock().
 670  */
 671 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 672 {
 673         char *data = head->write_buf;
 674         bool is_delete = tomoyo_str_starts(&data, "delete ");
 675
 676         if (!strcmp(data, "manage_by_non_root")) {
 677                 tomoyo_manage_by_non_root = !is_delete;
 678                 return 0;
 679         }
 680         return tomoyo_update_manager_entry(data, is_delete);
 681 }
 682
 683 /**
 684  * tomoyo_read_manager - Read manager policy.
 685  *
 686  * @head: Pointer to "struct tomoyo_io_buffer".
 687  *
 688  * Caller holds tomoyo_read_lock().
 689  */
 690 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 691 {
 692         if (head->r.eof)
 693                 return;
 694         list_for_each_cookie(head->r.acl,
 695                              &tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
 696                 struct tomoyo_manager *ptr =
 697                         list_entry(head->r.acl, typeof(*ptr), head.list);
 698                 if (ptr->head.is_deleted)
 699                         continue;
 700                 if (!tomoyo_flush(head))
 701                         return;
 702                 tomoyo_set_string(head, ptr->manager->name);
 703                 tomoyo_set_lf(head);
 704         }
 705         head->r.eof = true;
 706 }
 707
 708 /**
 709  * tomoyo_manager - Check whether the current process is a policy manager.
 710  *
 711  * Returns true if the current process is permitted to modify policy
 712  * via /sys/kernel/security/tomoyo/ interface.
 713  *
 714  * Caller holds tomoyo_read_lock().
 715  */
 716 static bool tomoyo_manager(void)
 717 {
 718         struct tomoyo_manager *ptr;
 719         const char *exe;
 720         const struct task_struct *task = current;
 721         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 722         bool found = false;
 723
 724         if (!tomoyo_policy_loaded)
 725                 return true;
 726         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 727                 return false;
 728         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 729                                 head.list) {
 730                 if (!ptr->head.is_deleted && ptr->is_domain
 731                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 732                         found = true;
 733                         break;
 734                 }
 735         }
 736         if (found)
 737                 return true;
 738         exe = tomoyo_get_exe();
 739         if (!exe)
 740                 return false;
 741         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 742                                 head.list) {
 743                 if (!ptr->head.is_deleted && !ptr->is_domain
 744                     && !strcmp(exe, ptr->manager->name)) {
 745                         found = true;
 746                         break;
 747                 }
 748         }
 749         if (!found) { /* Reduce error messages. */
 750                 static pid_t last_pid;
 751                 const pid_t pid = current->pid;
 752                 if (last_pid != pid) {
 753                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 754                                "update policies.\n", domainname->name, exe);
 755                         last_pid = pid;
 756                 }
 757         }
 758         kfree(exe);
 759         return found;
 760 }
 761
 762 /**
 763  * tomoyo_select_one - Parse select command.
 764  *
 765  * @head: Pointer to "struct tomoyo_io_buffer".
 766  * @data: String to parse.
 767  *
 768  * Returns true on success, false otherwise.
 769  *
 770  * Caller holds tomoyo_read_lock().
 771  */
 772 static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
 773 {
 774         unsigned int pid;
 775         struct tomoyo_domain_info *domain = NULL;
 776         bool global_pid = false;
 777
 778         if (!strcmp(data, "allow_execute")) {
 779                 head->r.print_execute_only = true;
 780                 return true;
 781         }
 782         if (sscanf(data, "pid=%u", &pid) == 1 ||
 783             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 784                 struct task_struct *p;
 785                 rcu_read_lock();
 786                 read_lock(&tasklist_lock);
 787                 if (global_pid)
 788                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 789                 else
 790                         p = find_task_by_vpid(pid);
 791                 if (p)
 792                         domain = tomoyo_real_domain(p);
 793                 read_unlock(&tasklist_lock);
 794                 rcu_read_unlock();
 795         } else if (!strncmp(data, "domain=", 7)) {
 796                 if (tomoyo_domain_def(data + 7))
 797                         domain = tomoyo_find_domain(data + 7);
 798         } else
 799                 return false;
 800         head->w.domain = domain;
 801         /* Accessing read_buf is safe because head->io_sem is held. */
 802         if (!head->read_buf)
 803                 return true; /* Do nothing if open(O_WRONLY). */
 804         memset(&head->r, 0, sizeof(head->r));
 805         head->r.print_this_domain_only = true;
 806         if (domain)
 807                 head->r.domain = &domain->list;
 808         else
 809                 head->r.eof = 1;
 810         tomoyo_io_printf(head, "# select %s\n", data);
 811         if (domain && domain->is_deleted)
 812                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 813         return true;
 814 }
 815
 816 /**
 817  * tomoyo_delete_domain - Delete a domain.
 818  *
 819  * @domainname: The name of domain.
 820  *
 821  * Returns 0.
 822  *
 823  * Caller holds tomoyo_read_lock().
 824  */
 825 static int tomoyo_delete_domain(char *domainname)
 826 {
 827         struct tomoyo_domain_info *domain;
 828         struct tomoyo_path_info name;
 829
 830         name.name = domainname;
 831         tomoyo_fill_path_info(&name);
 832         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 833                 return 0;
 834         /* Is there an active domain? */
 835         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 836                 /* Never delete tomoyo_kernel_domain */
 837                 if (domain == &tomoyo_kernel_domain)
 838                         continue;
 839                 if (domain->is_deleted ||
 840                     tomoyo_pathcmp(domain->domainname, &name))
 841                         continue;
 842                 domain->is_deleted = true;
 843                 break;
 844         }
 845         mutex_unlock(&tomoyo_policy_lock);
 846         return 0;
 847 }
 848
 849 /**
 850  * tomoyo_write_domain2 - Write domain policy.
 851  *
 852  * @list:      Pointer to "struct list_head".
 853  * @data:      Policy to be interpreted.
 854  * @is_delete: True if it is a delete request.
 855  *
 856  * Returns 0 on success, negative value otherwise.
 857  *
 858  * Caller holds tomoyo_read_lock().
 859  */
 860 static int tomoyo_write_domain2(struct list_head *list, char *data,
 861                                 const bool is_delete)
 862 {
 863         struct tomoyo_acl_param param = {
 864                 .list = list,
 865                 .data = data,
 866                 .is_delete = is_delete,
 867         };
 868         static const struct {
 869                 const char *keyword;
 870                 int (*write) (struct tomoyo_acl_param *);
 871         } tomoyo_callback[1] = {
 872                 { "file ", tomoyo_write_file },
 873         };
 874         u8 i;
 875         for (i = 0; i < 1; i++) {
 876                 if (!tomoyo_str_starts(&param.data,
 877                                        tomoyo_callback[i].keyword))
 878                         continue;
 879                 return tomoyo_callback[i].write(&param);
 880         }
 881         return -EINVAL;
 882 }
 883
 884 /**
 885  * tomoyo_write_domain - Write domain policy.
 886  *
 887  * @head: Pointer to "struct tomoyo_io_buffer".
 888  *
 889  * Returns 0 on success, negative value otherwise.
 890  *
 891  * Caller holds tomoyo_read_lock().
 892  */
 893 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
 894 {
 895         char *data = head->write_buf;
 896         struct tomoyo_domain_info *domain = head->w.domain;
 897         bool is_delete = false;
 898         bool is_select = false;
 899         unsigned int profile;
 900
 901         if (tomoyo_str_starts(&data, "delete "))
 902                 is_delete = true;
 903         else if (tomoyo_str_starts(&data, "select "))
 904                 is_select = true;
 905         if (is_select && tomoyo_select_one(head, data))
 906                 return 0;
 907         /* Don't allow updating policies by non manager programs. */
 908         if (!tomoyo_manager())
 909                 return -EPERM;
 910         if (tomoyo_domain_def(data)) {
 911                 domain = NULL;
 912                 if (is_delete)
 913                         tomoyo_delete_domain(data);
 914                 else if (is_select)
 915                         domain = tomoyo_find_domain(data);
 916                 else
 917                         domain = tomoyo_assign_domain(data, 0);
 918                 head->w.domain = domain;
 919                 return 0;
 920         }
 921         if (!domain)
 922                 return -EINVAL;
 923
 924         if (sscanf(data, "use_profile %u", &profile) == 1
 925             && profile < TOMOYO_MAX_PROFILES) {
 926                 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
 927                         domain->profile = (u8) profile;
 928                 return 0;
 929         }
 930         if (!strcmp(data, "quota_exceeded")) {
 931                 domain->quota_warned = !is_delete;
 932                 return 0;
 933         }
 934         if (!strcmp(data, "transition_failed")) {
 935                 domain->transition_failed = !is_delete;
 936                 return 0;
 937         }
 938         return tomoyo_write_domain2(&domain->acl_info_list, data, is_delete);
 939 }
 940
 941 /**
 942  * tomoyo_set_group - Print category name.
 943  *
 944  * @head:     Pointer to "struct tomoyo_io_buffer".
 945  * @category: Category name.
 946  *
 947  * Returns nothing.
 948  */
 949 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
 950                              const char *category)
 951 {
 952         tomoyo_set_string(head, category);
 953 }
 954
 955 /**
 956  * tomoyo_print_entry - Print an ACL entry.
 957  *
 958  * @head: Pointer to "struct tomoyo_io_buffer".
 959  * @acl:  Pointer to an ACL entry.
 960  *
 961  * Returns true on success, false otherwise.
 962  */
 963 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
 964                                struct tomoyo_acl_info *acl)
 965 {
 966         const u8 acl_type = acl->type;
 967         bool first = true;
 968         u8 bit;
 969
 970         if (acl->is_deleted)
 971                 return true;
 972         if (!tomoyo_flush(head))
 973                 return false;
 974         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
 975                 struct tomoyo_path_acl *ptr =
 976                         container_of(acl, typeof(*ptr), head);
 977                 const u16 perm = ptr->perm;
 978                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
 979                         if (!(perm & (1 << bit)))
 980                                 continue;
 981                         if (head->r.print_execute_only &&
 982                             bit != TOMOYO_TYPE_EXECUTE)
 983                                 continue;
 984                         if (first) {
 985                                 tomoyo_set_group(head, "file ");
 986                                 first = false;
 987                         } else {
 988                                 tomoyo_set_slash(head);
 989                         }
 990                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
 991                 }
 992                 if (first)
 993                         return true;
 994                 tomoyo_print_name_union(head, &ptr->name);
 995         } else if (head->r.print_execute_only) {
 996                 return true;
 997         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
 998                 struct tomoyo_path2_acl *ptr =
 999                         container_of(acl, typeof(*ptr), head);
1000                 const u8 perm = ptr->perm;
1001                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1002                         if (!(perm & (1 << bit)))
1003                                 continue;
1004                         if (first) {
1005                                 tomoyo_set_group(head, "file ");
1006                                 first = false;
1007                         } else {
1008                                 tomoyo_set_slash(head);
1009                         }
1010                         tomoyo_set_string(head, tomoyo_mac_keywords
1011                                           [tomoyo_pp2mac[bit]]);
1012                 }
1013                 if (first)
1014                         return true;
1015                 tomoyo_print_name_union(head, &ptr->name1);
1016                 tomoyo_print_name_union(head, &ptr->name2);
1017         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1018                 struct tomoyo_path_number_acl *ptr =
1019                         container_of(acl, typeof(*ptr), head);
1020                 const u8 perm = ptr->perm;
1021                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1022                         if (!(perm & (1 << bit)))
1023                                 continue;
1024                         if (first) {
1025                                 tomoyo_set_group(head, "file ");
1026                                 first = false;
1027                         } else {
1028                                 tomoyo_set_slash(head);
1029                         }
1030                         tomoyo_set_string(head, tomoyo_mac_keywords
1031                                           [tomoyo_pn2mac[bit]]);
1032                 }
1033                 if (first)
1034                         return true;
1035                 tomoyo_print_name_union(head, &ptr->name);
1036                 tomoyo_print_number_union(head, &ptr->number);
1037         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1038                 struct tomoyo_mkdev_acl *ptr =
1039                         container_of(acl, typeof(*ptr), head);
1040                 const u8 perm = ptr->perm;
1041                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1042                         if (!(perm & (1 << bit)))
1043                                 continue;
1044                         if (first) {
1045                                 tomoyo_set_group(head, "file ");
1046                                 first = false;
1047                         } else {
1048                                 tomoyo_set_slash(head);
1049                         }
1050                         tomoyo_set_string(head, tomoyo_mac_keywords
1051                                           [tomoyo_pnnn2mac[bit]]);
1052                 }
1053                 if (first)
1054                         return true;
1055                 tomoyo_print_name_union(head, &ptr->name);
1056                 tomoyo_print_number_union(head, &ptr->mode);
1057                 tomoyo_print_number_union(head, &ptr->major);
1058                 tomoyo_print_number_union(head, &ptr->minor);
1059         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1060                 struct tomoyo_mount_acl *ptr =
1061                         container_of(acl, typeof(*ptr), head);
1062                 tomoyo_set_group(head, "file mount");
1063                 tomoyo_print_name_union(head, &ptr->dev_name);
1064                 tomoyo_print_name_union(head, &ptr->dir_name);
1065                 tomoyo_print_name_union(head, &ptr->fs_type);
1066                 tomoyo_print_number_union(head, &ptr->flags);
1067         }
1068         tomoyo_set_lf(head);
1069         return true;
1070 }
1071
1072 /**
1073  * tomoyo_read_domain2 - Read domain policy.
1074  *
1075  * @head:   Pointer to "struct tomoyo_io_buffer".
1076  * @domain: Pointer to "struct tomoyo_domain_info".
1077  *
1078  * Caller holds tomoyo_read_lock().
1079  *
1080  * Returns true on success, false otherwise.
1081  */
1082 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1083                                 struct tomoyo_domain_info *domain)
1084 {
1085         list_for_each_cookie(head->r.acl, &domain->acl_info_list) {
1086                 struct tomoyo_acl_info *ptr =
1087                         list_entry(head->r.acl, typeof(*ptr), list);
1088                 if (!tomoyo_print_entry(head, ptr))
1089                         return false;
1090         }
1091         head->r.acl = NULL;
1092         return true;
1093 }
1094
1095 /**
1096  * tomoyo_read_domain - Read domain policy.
1097  *
1098  * @head: Pointer to "struct tomoyo_io_buffer".
1099  *
1100  * Caller holds tomoyo_read_lock().
1101  */
1102 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1103 {
1104         if (head->r.eof)
1105                 return;
1106         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1107                 struct tomoyo_domain_info *domain =
1108                         list_entry(head->r.domain, typeof(*domain), list);
1109                 switch (head->r.step) {
1110                 case 0:
1111                         if (domain->is_deleted &&
1112                             !head->r.print_this_domain_only)
1113                                 continue;
1114                         /* Print domainname and flags. */
1115                         tomoyo_set_string(head, domain->domainname->name);
1116                         tomoyo_set_lf(head);
1117                         tomoyo_io_printf(head, "use_profile %u\n",
1118                                          domain->profile);
1119                         if (domain->quota_warned)
1120                                 tomoyo_set_string(head, "quota_exceeded\n");
1121                         if (domain->transition_failed)
1122                                 tomoyo_set_string(head, "transition_failed\n");
1123                         head->r.step++;
1124                         tomoyo_set_lf(head);
1125                         /* fall through */
1126                 case 1:
1127                         if (!tomoyo_read_domain2(head, domain))
1128                                 return;
1129                         head->r.step++;
1130                         if (!tomoyo_set_lf(head))
1131                                 return;
1132                         /* fall through */
1133                 case 2:
1134                         head->r.step = 0;
1135                         if (head->r.print_this_domain_only)
1136                                 goto done;
1137                 }
1138         }
1139  done:
1140         head->r.eof = true;
1141 }
1142
1143 /**
1144  * tomoyo_write_domain_profile - Assign profile for specified domain.
1145  *
1146  * @head: Pointer to "struct tomoyo_io_buffer".
1147  *
1148  * Returns 0 on success, -EINVAL otherwise.
1149  *
1150  * This is equivalent to doing
1151  *
1152  *     ( echo "select " $domainname; echo "use_profile " $profile ) |
1153  *     /usr/sbin/tomoyo-loadpolicy -d
1154  *
1155  * Caller holds tomoyo_read_lock().
1156  */
1157 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1158 {
1159         char *data = head->write_buf;
1160         char *cp = strchr(data, ' ');
1161         struct tomoyo_domain_info *domain;
1162         unsigned long profile;
1163
1164         if (!cp)
1165                 return -EINVAL;
1166         *cp = '\0';
1167         domain = tomoyo_find_domain(cp + 1);
1168         if (strict_strtoul(data, 10, &profile))
1169                 return -EINVAL;
1170         if (domain && profile < TOMOYO_MAX_PROFILES
1171             && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1172                 domain->profile = (u8) profile;
1173         return 0;
1174 }
1175
1176 /**
1177  * tomoyo_read_domain_profile - Read only domainname and profile.
1178  *
1179  * @head: Pointer to "struct tomoyo_io_buffer".
1180  *
1181  * Returns list of profile number and domainname pairs.
1182  *
1183  * This is equivalent to doing
1184  *
1185  *     grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1186  *     awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1187  *     domainname = $0; } else if ( $1 == "use_profile" ) {
1188  *     print $2 " " domainname; domainname = ""; } } ; '
1189  *
1190  * Caller holds tomoyo_read_lock().
1191  */
1192 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1193 {
1194         if (head->r.eof)
1195                 return;
1196         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1197                 struct tomoyo_domain_info *domain =
1198                         list_entry(head->r.domain, typeof(*domain), list);
1199                 if (domain->is_deleted)
1200                         continue;
1201                 if (!tomoyo_flush(head))
1202                         return;
1203                 tomoyo_io_printf(head, "%u ", domain->profile);
1204                 tomoyo_set_string(head, domain->domainname->name);
1205                 tomoyo_set_lf(head);
1206         }
1207         head->r.eof = true;
1208 }
1209
1210 /**
1211  * tomoyo_write_pid: Specify PID to obtain domainname.
1212  *
1213  * @head: Pointer to "struct tomoyo_io_buffer".
1214  *
1215  * Returns 0.
1216  */
1217 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1218 {
1219         head->r.eof = false;
1220         return 0;
1221 }
1222
1223 /**
1224  * tomoyo_read_pid - Get domainname of the specified PID.
1225  *
1226  * @head: Pointer to "struct tomoyo_io_buffer".
1227  *
1228  * Returns the domainname which the specified PID is in on success,
1229  * empty string otherwise.
1230  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1231  * using read()/write() interface rather than sysctl() interface.
1232  */
1233 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1234 {
1235         char *buf = head->write_buf;
1236         bool global_pid = false;
1237         unsigned int pid;
1238         struct task_struct *p;
1239         struct tomoyo_domain_info *domain = NULL;
1240
1241         /* Accessing write_buf is safe because head->io_sem is held. */
1242         if (!buf) {
1243                 head->r.eof = true;
1244                 return; /* Do nothing if open(O_RDONLY). */
1245         }
1246         if (head->r.w_pos || head->r.eof)
1247                 return;
1248         head->r.eof = true;
1249         if (tomoyo_str_starts(&buf, "global-pid "))
1250                 global_pid = true;
1251         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1252         rcu_read_lock();
1253         read_lock(&tasklist_lock);
1254         if (global_pid)
1255                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1256         else
1257                 p = find_task_by_vpid(pid);
1258         if (p)
1259                 domain = tomoyo_real_domain(p);
1260         read_unlock(&tasklist_lock);
1261         rcu_read_unlock();
1262         if (!domain)
1263                 return;
1264         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1265         tomoyo_set_string(head, domain->domainname->name);
1266 }
1267
1268 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1269         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain",
1270         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain",
1271         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain",
1272         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain",
1273 };
1274
1275 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1276         [TOMOYO_PATH_GROUP]   = "path_group ",
1277         [TOMOYO_NUMBER_GROUP] = "number_group ",
1278 };
1279
1280 /**
1281  * tomoyo_write_exception - Write exception policy.
1282  *
1283  * @head: Pointer to "struct tomoyo_io_buffer".
1284  *
1285  * Returns 0 on success, negative value otherwise.
1286  *
1287  * Caller holds tomoyo_read_lock().
1288  */
1289 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1290 {
1291         struct tomoyo_acl_param param = {
1292                 .data = head->write_buf,
1293         };
1294         u8 i;
1295         param.is_delete = tomoyo_str_starts(&param.data, "delete ");
1296         if (tomoyo_str_starts(&param.data, "aggregator "))
1297                 return tomoyo_write_aggregator(&param);
1298         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1299                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1300                         return tomoyo_write_transition_control(&param, i);
1301         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1302                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1303                         return tomoyo_write_group(&param, i);
1304         return -EINVAL;
1305 }
1306
1307 /**
1308  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1309  *
1310  * @head: Pointer to "struct tomoyo_io_buffer".
1311  * @idx:  Index number.
1312  *
1313  * Returns true on success, false otherwise.
1314  *
1315  * Caller holds tomoyo_read_lock().
1316  */
1317 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1318 {
1319         list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
1320                 struct tomoyo_group *group =
1321                         list_entry(head->r.group, typeof(*group), head.list);
1322                 list_for_each_cookie(head->r.acl, &group->member_list) {
1323                         struct tomoyo_acl_head *ptr =
1324                                 list_entry(head->r.acl, typeof(*ptr), list);
1325                         if (ptr->is_deleted)
1326                                 continue;
1327                         if (!tomoyo_flush(head))
1328                                 return false;
1329                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1330                         tomoyo_set_string(head, group->group_name->name);
1331                         if (idx == TOMOYO_PATH_GROUP) {
1332                                 tomoyo_set_space(head);
1333                                 tomoyo_set_string(head, container_of
1334                                                (ptr, struct tomoyo_path_group,
1335                                                 head)->member_name->name);
1336                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1337                                 tomoyo_print_number_union(head, &container_of
1338                                                           (ptr,
1339                                                    struct tomoyo_number_group,
1340                                                            head)->number);
1341                         }
1342                         tomoyo_set_lf(head);
1343                 }
1344                 head->r.acl = NULL;
1345         }
1346         head->r.group = NULL;
1347         return true;
1348 }
1349
1350 /**
1351  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1352  *
1353  * @head: Pointer to "struct tomoyo_io_buffer".
1354  * @idx:  Index number.
1355  *
1356  * Returns true on success, false otherwise.
1357  *
1358  * Caller holds tomoyo_read_lock().
1359  */
1360 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1361 {
1362         list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) {
1363                 struct tomoyo_acl_head *acl =
1364                         container_of(head->r.acl, typeof(*acl), list);
1365                 if (acl->is_deleted)
1366                         continue;
1367                 if (!tomoyo_flush(head))
1368                         return false;
1369                 switch (idx) {
1370                 case TOMOYO_ID_TRANSITION_CONTROL:
1371                         {
1372                                 struct tomoyo_transition_control *ptr =
1373                                         container_of(acl, typeof(*ptr), head);
1374                                 tomoyo_set_string(head, tomoyo_transition_type
1375                                                   [ptr->type]);
1376                                 tomoyo_set_string(head, ptr->program ?
1377                                                   ptr->program->name : "any");
1378                                 tomoyo_set_string(head, " from ");
1379                                 tomoyo_set_string(head, ptr->domainname ?
1380                                                   ptr->domainname->name :
1381                                                   "any");
1382                         }
1383                         break;
1384                 case TOMOYO_ID_AGGREGATOR:
1385                         {
1386                                 struct tomoyo_aggregator *ptr =
1387                                         container_of(acl, typeof(*ptr), head);
1388                                 tomoyo_set_string(head, "aggregator ");
1389                                 tomoyo_set_string(head,
1390                                                   ptr->original_name->name);
1391                                 tomoyo_set_space(head);
1392                                 tomoyo_set_string(head,
1393                                                ptr->aggregated_name->name);
1394                         }
1395                         break;
1396                 default:
1397                         continue;
1398                 }
1399                 tomoyo_set_lf(head);
1400         }
1401         head->r.acl = NULL;
1402         return true;
1403 }
1404
1405 /**
1406  * tomoyo_read_exception - Read exception policy.
1407  *
1408  * @head: Pointer to "struct tomoyo_io_buffer".
1409  *
1410  * Caller holds tomoyo_read_lock().
1411  */
1412 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1413 {
1414         if (head->r.eof)
1415                 return;
1416         while (head->r.step < TOMOYO_MAX_POLICY &&
1417                tomoyo_read_policy(head, head->r.step))
1418                 head->r.step++;
1419         if (head->r.step < TOMOYO_MAX_POLICY)
1420                 return;
1421         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1422                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1423                 head->r.step++;
1424         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1425                 return;
1426         head->r.eof = true;
1427 }
1428
1429 /**
1430  * tomoyo_print_header - Get header line of audit log.
1431  *
1432  * @r: Pointer to "struct tomoyo_request_info".
1433  *
1434  * Returns string representation.
1435  *
1436  * This function uses kmalloc(), so caller must kfree() if this function
1437  * didn't return NULL.
1438  */
1439 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1440 {
1441         struct timeval tv;
1442         const pid_t gpid = task_pid_nr(current);
1443         static const int tomoyo_buffer_len = 4096;
1444         char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1445         pid_t ppid;
1446         if (!buffer)
1447                 return NULL;
1448         do_gettimeofday(&tv);
1449         rcu_read_lock();
1450         ppid = task_tgid_vnr(current->real_parent);
1451         rcu_read_unlock();
1452         snprintf(buffer, tomoyo_buffer_len - 1,
1453                  "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1454                  " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1455                  " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1456                  tv.tv_sec, r->profile, tomoyo_mode[r->mode], gpid,
1457                  task_tgid_vnr(current), ppid,
1458                  current_uid(), current_gid(), current_euid(),
1459                  current_egid(), current_suid(), current_sgid(),
1460                  current_fsuid(), current_fsgid());
1461         return buffer;
1462 }
1463
1464 /**
1465  * tomoyo_init_audit_log - Allocate buffer for audit logs.
1466  *
1467  * @len: Required size.
1468  * @r:   Pointer to "struct tomoyo_request_info".
1469  *
1470  * Returns pointer to allocated memory.
1471  *
1472  * The @len is updated to add the header lines' size on success.
1473  *
1474  * This function uses kzalloc(), so caller must kfree() if this function
1475  * didn't return NULL.
1476  */
1477 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1478 {
1479         char *buf = NULL;
1480         const char *header;
1481         const char *domainname;
1482         if (!r->domain)
1483                 r->domain = tomoyo_domain();
1484         domainname = r->domain->domainname->name;
1485         header = tomoyo_print_header(r);
1486         if (!header)
1487                 return NULL;
1488         *len += strlen(domainname) + strlen(header) + 10;
1489         buf = kzalloc(*len, GFP_NOFS);
1490         if (buf)
1491                 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1492         kfree(header);
1493         return buf;
1494 }
1495
1496 /* Wait queue for tomoyo_query_list. */
1497 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1498
1499 /* Lock for manipulating tomoyo_query_list. */
1500 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1501
1502 /* Structure for query. */
1503 struct tomoyo_query {
1504         struct list_head list;
1505         char *query;
1506         int query_len;
1507         unsigned int serial;
1508         int timer;
1509         int answer;
1510 };
1511
1512 /* The list for "struct tomoyo_query". */
1513 static LIST_HEAD(tomoyo_query_list);
1514
1515 /*
1516  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1517  * interface.
1518  */
1519 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1520
1521 /**
1522  * tomoyo_supervisor - Ask for the supervisor's decision.
1523  *
1524  * @r:       Pointer to "struct tomoyo_request_info".
1525  * @fmt:     The printf()'s format string, followed by parameters.
1526  *
1527  * Returns 0 if the supervisor decided to permit the access request which
1528  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1529  * supervisor decided to retry the access request which violated the policy in
1530  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1531  */
1532 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1533 {
1534         va_list args;
1535         int error = -EPERM;
1536         int pos;
1537         int len;
1538         static unsigned int tomoyo_serial;
1539         struct tomoyo_query *entry = NULL;
1540         bool quota_exceeded = false;
1541         char *header;
1542         switch (r->mode) {
1543                 char *buffer;
1544         case TOMOYO_CONFIG_LEARNING:
1545                 if (!tomoyo_domain_quota_is_ok(r))
1546                         return 0;
1547                 va_start(args, fmt);
1548                 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1549                 va_end(args);
1550                 buffer = kmalloc(len, GFP_NOFS);
1551                 if (!buffer)
1552                         return 0;
1553                 va_start(args, fmt);
1554                 vsnprintf(buffer, len - 1, fmt, args);
1555                 va_end(args);
1556                 tomoyo_normalize_line(buffer);
1557                 tomoyo_write_domain2(&r->domain->acl_info_list, buffer, false);
1558                 kfree(buffer);
1559                 /* fall through */
1560         case TOMOYO_CONFIG_PERMISSIVE:
1561                 return 0;
1562         }
1563         if (!r->domain)
1564                 r->domain = tomoyo_domain();
1565         if (!atomic_read(&tomoyo_query_observers))
1566                 return -EPERM;
1567         va_start(args, fmt);
1568         len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1569         va_end(args);
1570         header = tomoyo_init_audit_log(&len, r);
1571         if (!header)
1572                 goto out;
1573         entry = kzalloc(sizeof(*entry), GFP_NOFS);
1574         if (!entry)
1575                 goto out;
1576         entry->query = kzalloc(len, GFP_NOFS);
1577         if (!entry->query)
1578                 goto out;
1579         len = ksize(entry->query);
1580         spin_lock(&tomoyo_query_list_lock);
1581         if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1582             sizeof(*entry) >= tomoyo_quota_for_query) {
1583                 quota_exceeded = true;
1584         } else {
1585                 tomoyo_query_memory_size += len + sizeof(*entry);
1586                 entry->serial = tomoyo_serial++;
1587         }
1588         spin_unlock(&tomoyo_query_list_lock);
1589         if (quota_exceeded)
1590                 goto out;
1591         pos = snprintf(entry->query, len - 1, "Q%u-%hu\n%s",
1592                        entry->serial, r->retry, header);
1593         kfree(header);
1594         header = NULL;
1595         va_start(args, fmt);
1596         vsnprintf(entry->query + pos, len - 1 - pos, fmt, args);
1597         entry->query_len = strlen(entry->query) + 1;
1598         va_end(args);
1599         spin_lock(&tomoyo_query_list_lock);
1600         list_add_tail(&entry->list, &tomoyo_query_list);
1601         spin_unlock(&tomoyo_query_list_lock);
1602         /* Give 10 seconds for supervisor's opinion. */
1603         for (entry->timer = 0;
1604              atomic_read(&tomoyo_query_observers) && entry->timer < 100;
1605              entry->timer++) {
1606                 wake_up(&tomoyo_query_wait);
1607                 set_current_state(TASK_INTERRUPTIBLE);
1608                 schedule_timeout(HZ / 10);
1609                 if (entry->answer)
1610                         break;
1611         }
1612         spin_lock(&tomoyo_query_list_lock);
1613         list_del(&entry->list);
1614         tomoyo_query_memory_size -= len + sizeof(*entry);
1615         spin_unlock(&tomoyo_query_list_lock);
1616         switch (entry->answer) {
1617         case 3: /* Asked to retry by administrator. */
1618                 error = TOMOYO_RETRY_REQUEST;
1619                 r->retry++;
1620                 break;
1621         case 1:
1622                 /* Granted by administrator. */
1623                 error = 0;
1624                 break;
1625         case 0:
1626                 /* Timed out. */
1627                 break;
1628         default:
1629                 /* Rejected by administrator. */
1630                 break;
1631         }
1632  out:
1633         if (entry)
1634                 kfree(entry->query);
1635         kfree(entry);
1636         kfree(header);
1637         return error;
1638 }
1639
1640 /**
1641  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1642  *
1643  * @file: Pointer to "struct file".
1644  * @wait: Pointer to "poll_table".
1645  *
1646  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1647  *
1648  * Waits for access requests which violated policy in enforcing mode.
1649  */
1650 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1651 {
1652         struct list_head *tmp;
1653         bool found = false;
1654         u8 i;
1655         for (i = 0; i < 2; i++) {
1656                 spin_lock(&tomoyo_query_list_lock);
1657                 list_for_each(tmp, &tomoyo_query_list) {
1658                         struct tomoyo_query *ptr =
1659                                 list_entry(tmp, typeof(*ptr), list);
1660                         if (ptr->answer)
1661                                 continue;
1662                         found = true;
1663                         break;
1664                 }
1665                 spin_unlock(&tomoyo_query_list_lock);
1666                 if (found)
1667                         return POLLIN | POLLRDNORM;
1668                 if (i)
1669                         break;
1670                 poll_wait(file, &tomoyo_query_wait, wait);
1671         }
1672         return 0;
1673 }
1674
1675 /**
1676  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1677  *
1678  * @head: Pointer to "struct tomoyo_io_buffer".
1679  */
1680 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1681 {
1682         struct list_head *tmp;
1683         int pos = 0;
1684         int len = 0;
1685         char *buf;
1686         if (head->r.w_pos)
1687                 return;
1688         if (head->read_buf) {
1689                 kfree(head->read_buf);
1690                 head->read_buf = NULL;
1691         }
1692         spin_lock(&tomoyo_query_list_lock);
1693         list_for_each(tmp, &tomoyo_query_list) {
1694                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1695                 if (ptr->answer)
1696                         continue;
1697                 if (pos++ != head->r.query_index)
1698                         continue;
1699                 len = ptr->query_len;
1700                 break;
1701         }
1702         spin_unlock(&tomoyo_query_list_lock);
1703         if (!len) {
1704                 head->r.query_index = 0;
1705                 return;
1706         }
1707         buf = kzalloc(len, GFP_NOFS);
1708         if (!buf)
1709                 return;
1710         pos = 0;
1711         spin_lock(&tomoyo_query_list_lock);
1712         list_for_each(tmp, &tomoyo_query_list) {
1713                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1714                 if (ptr->answer)
1715                         continue;
1716                 if (pos++ != head->r.query_index)
1717                         continue;
1718                 /*
1719                  * Some query can be skipped because tomoyo_query_list
1720                  * can change, but I don't care.
1721                  */
1722                 if (len == ptr->query_len)
1723                         memmove(buf, ptr->query, len);
1724                 break;
1725         }
1726         spin_unlock(&tomoyo_query_list_lock);
1727         if (buf[0]) {
1728                 head->read_buf = buf;
1729                 head->r.w[head->r.w_pos++] = buf;
1730                 head->r.query_index++;
1731         } else {
1732                 kfree(buf);
1733         }
1734 }
1735
1736 /**
1737  * tomoyo_write_answer - Write the supervisor's decision.
1738  *
1739  * @head: Pointer to "struct tomoyo_io_buffer".
1740  *
1741  * Returns 0 on success, -EINVAL otherwise.
1742  */
1743 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1744 {
1745         char *data = head->write_buf;
1746         struct list_head *tmp;
1747         unsigned int serial;
1748         unsigned int answer;
1749         spin_lock(&tomoyo_query_list_lock);
1750         list_for_each(tmp, &tomoyo_query_list) {
1751                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1752                 ptr->timer = 0;
1753         }
1754         spin_unlock(&tomoyo_query_list_lock);
1755         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1756                 return -EINVAL;
1757         spin_lock(&tomoyo_query_list_lock);
1758         list_for_each(tmp, &tomoyo_query_list) {
1759                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1760                 if (ptr->serial != serial)
1761                         continue;
1762                 if (!ptr->answer)
1763                         ptr->answer = answer;
1764                 break;
1765         }
1766         spin_unlock(&tomoyo_query_list_lock);
1767         return 0;
1768 }
1769
1770 /**
1771  * tomoyo_read_version: Get version.
1772  *
1773  * @head: Pointer to "struct tomoyo_io_buffer".
1774  *
1775  * Returns version information.
1776  */
1777 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1778 {
1779         if (!head->r.eof) {
1780                 tomoyo_io_printf(head, "2.3.0");
1781                 head->r.eof = true;
1782         }
1783 }
1784
1785 /**
1786  * tomoyo_read_self_domain - Get the current process's domainname.
1787  *
1788  * @head: Pointer to "struct tomoyo_io_buffer".
1789  *
1790  * Returns the current process's domainname.
1791  */
1792 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1793 {
1794         if (!head->r.eof) {
1795                 /*
1796                  * tomoyo_domain()->domainname != NULL
1797                  * because every process belongs to a domain and
1798                  * the domain's name cannot be NULL.
1799                  */
1800                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1801                 head->r.eof = true;
1802         }
1803 }
1804
1805 /**
1806  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1807  *
1808  * @type: Type of interface.
1809  * @file: Pointer to "struct file".
1810  *
1811  * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1812  *
1813  * Caller acquires tomoyo_read_lock().
1814  */
1815 int tomoyo_open_control(const u8 type, struct file *file)
1816 {
1817         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1818
1819         if (!head)
1820                 return -ENOMEM;
1821         mutex_init(&head->io_sem);
1822         head->type = type;
1823         switch (type) {
1824         case TOMOYO_DOMAINPOLICY:
1825                 /* /sys/kernel/security/tomoyo/domain_policy */
1826                 head->write = tomoyo_write_domain;
1827                 head->read = tomoyo_read_domain;
1828                 break;
1829         case TOMOYO_EXCEPTIONPOLICY:
1830                 /* /sys/kernel/security/tomoyo/exception_policy */
1831                 head->write = tomoyo_write_exception;
1832                 head->read = tomoyo_read_exception;
1833                 break;
1834         case TOMOYO_SELFDOMAIN:
1835                 /* /sys/kernel/security/tomoyo/self_domain */
1836                 head->read = tomoyo_read_self_domain;
1837                 break;
1838         case TOMOYO_DOMAIN_STATUS:
1839                 /* /sys/kernel/security/tomoyo/.domain_status */
1840                 head->write = tomoyo_write_domain_profile;
1841                 head->read = tomoyo_read_domain_profile;
1842                 break;
1843         case TOMOYO_PROCESS_STATUS:
1844                 /* /sys/kernel/security/tomoyo/.process_status */
1845                 head->write = tomoyo_write_pid;
1846                 head->read = tomoyo_read_pid;
1847                 break;
1848         case TOMOYO_VERSION:
1849                 /* /sys/kernel/security/tomoyo/version */
1850                 head->read = tomoyo_read_version;
1851                 head->readbuf_size = 128;
1852                 break;
1853         case TOMOYO_MEMINFO:
1854                 /* /sys/kernel/security/tomoyo/meminfo */
1855                 head->write = tomoyo_write_memory_quota;
1856                 head->read = tomoyo_read_memory_counter;
1857                 head->readbuf_size = 512;
1858                 break;
1859         case TOMOYO_PROFILE:
1860                 /* /sys/kernel/security/tomoyo/profile */
1861                 head->write = tomoyo_write_profile;
1862                 head->read = tomoyo_read_profile;
1863                 break;
1864         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1865                 head->poll = tomoyo_poll_query;
1866                 head->write = tomoyo_write_answer;
1867                 head->read = tomoyo_read_query;
1868                 break;
1869         case TOMOYO_MANAGER:
1870                 /* /sys/kernel/security/tomoyo/manager */
1871                 head->write = tomoyo_write_manager;
1872                 head->read = tomoyo_read_manager;
1873                 break;
1874         }
1875         if (!(file->f_mode & FMODE_READ)) {
1876                 /*
1877                  * No need to allocate read_buf since it is not opened
1878                  * for reading.
1879                  */
1880                 head->read = NULL;
1881                 head->poll = NULL;
1882         } else if (!head->poll) {
1883                 /* Don't allocate read_buf for poll() access. */
1884                 if (!head->readbuf_size)
1885                         head->readbuf_size = 4096 * 2;
1886                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1887                 if (!head->read_buf) {
1888                         kfree(head);
1889                         return -ENOMEM;
1890                 }
1891         }
1892         if (!(file->f_mode & FMODE_WRITE)) {
1893                 /*
1894                  * No need to allocate write_buf since it is not opened
1895                  * for writing.
1896                  */
1897                 head->write = NULL;
1898         } else if (head->write) {
1899                 head->writebuf_size = 4096 * 2;
1900                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1901                 if (!head->write_buf) {
1902                         kfree(head->read_buf);
1903                         kfree(head);
1904                         return -ENOMEM;
1905                 }
1906         }
1907         if (type != TOMOYO_QUERY)
1908                 head->reader_idx = tomoyo_read_lock();
1909         file->private_data = head;
1910         /*
1911          * If the file is /sys/kernel/security/tomoyo/query , increment the
1912          * observer counter.
1913          * The obserber counter is used by tomoyo_supervisor() to see if
1914          * there is some process monitoring /sys/kernel/security/tomoyo/query.
1915          */
1916         if (type == TOMOYO_QUERY)
1917                 atomic_inc(&tomoyo_query_observers);
1918         return 0;
1919 }
1920
1921 /**
1922  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1923  *
1924  * @file: Pointer to "struct file".
1925  * @wait: Pointer to "poll_table".
1926  *
1927  * Waits for read readiness.
1928  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1929  */
1930 int tomoyo_poll_control(struct file *file, poll_table *wait)
1931 {
1932         struct tomoyo_io_buffer *head = file->private_data;
1933         if (!head->poll)
1934                 return -ENOSYS;
1935         return head->poll(file, wait);
1936 }
1937
1938 /**
1939  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1940  *
1941  * @head:       Pointer to "struct tomoyo_io_buffer".
1942  * @buffer:     Poiner to buffer to write to.
1943  * @buffer_len: Size of @buffer.
1944  *
1945  * Returns bytes read on success, negative value otherwise.
1946  *
1947  * Caller holds tomoyo_read_lock().
1948  */
1949 int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
1950                         const int buffer_len)
1951 {
1952         int len;
1953
1954         if (!head->read)
1955                 return -ENOSYS;
1956         if (mutex_lock_interruptible(&head->io_sem))
1957                 return -EINTR;
1958         head->read_user_buf = buffer;
1959         head->read_user_buf_avail = buffer_len;
1960         if (tomoyo_flush(head))
1961                 /* Call the policy handler. */
1962                 head->read(head);
1963         tomoyo_flush(head);
1964         len = head->read_user_buf - buffer;
1965         mutex_unlock(&head->io_sem);
1966         return len;
1967 }
1968
1969 /**
1970  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1971  *
1972  * @head:       Pointer to "struct tomoyo_io_buffer".
1973  * @buffer:     Pointer to buffer to read from.
1974  * @buffer_len: Size of @buffer.
1975  *
1976  * Returns @buffer_len on success, negative value otherwise.
1977  *
1978  * Caller holds tomoyo_read_lock().
1979  */
1980 int tomoyo_write_control(struct tomoyo_io_buffer *head,
1981                          const char __user *buffer, const int buffer_len)
1982 {
1983         int error = buffer_len;
1984         int avail_len = buffer_len;
1985         char *cp0 = head->write_buf;
1986
1987         if (!head->write)
1988                 return -ENOSYS;
1989         if (!access_ok(VERIFY_READ, buffer, buffer_len))
1990                 return -EFAULT;
1991         /* Don't allow updating policies by non manager programs. */
1992         if (head->write != tomoyo_write_pid &&
1993             head->write != tomoyo_write_domain && !tomoyo_manager())
1994                 return -EPERM;
1995         if (mutex_lock_interruptible(&head->io_sem))
1996                 return -EINTR;
1997         /* Read a line and dispatch it to the policy handler. */
1998         while (avail_len > 0) {
1999                 char c;
2000                 if (head->w.avail >= head->writebuf_size - 1) {
2001                         error = -ENOMEM;
2002                         break;
2003                 } else if (get_user(c, buffer)) {
2004                         error = -EFAULT;
2005                         break;
2006                 }
2007                 buffer++;
2008                 avail_len--;
2009                 cp0[head->w.avail++] = c;
2010                 if (c != '\n')
2011                         continue;
2012                 cp0[head->w.avail - 1] = '\0';
2013                 head->w.avail = 0;
2014                 tomoyo_normalize_line(cp0);
2015                 head->write(head);
2016         }
2017         mutex_unlock(&head->io_sem);
2018         return error;
2019 }
2020
2021 /**
2022  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2023  *
2024  * @head: Pointer to "struct tomoyo_io_buffer".
2025  *
2026  * Releases memory and returns 0.
2027  *
2028  * Caller looses tomoyo_read_lock().
2029  */
2030 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2031 {
2032         const bool is_write = !!head->write_buf;
2033
2034         /*
2035          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2036          * observer counter.
2037          */
2038         if (head->type == TOMOYO_QUERY)
2039                 atomic_dec(&tomoyo_query_observers);
2040         else
2041                 tomoyo_read_unlock(head->reader_idx);
2042         /* Release memory used for policy I/O. */
2043         kfree(head->read_buf);
2044         head->read_buf = NULL;
2045         kfree(head->write_buf);
2046         head->write_buf = NULL;
2047         kfree(head);
2048         if (is_write)
2049                 tomoyo_run_gc();
2050         return 0;
2051 }
2052
2053 /**
2054  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2055  */
2056 void tomoyo_check_profile(void)
2057 {
2058         struct tomoyo_domain_info *domain;
2059         const int idx = tomoyo_read_lock();
2060         tomoyo_policy_loaded = true;
2061         /* Check all profiles currently assigned to domains are defined. */
2062         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2063                 const u8 profile = domain->profile;
2064                 if (tomoyo_profile_ptr[profile])
2065                         continue;
2066                 printk(KERN_ERR "You need to define profile %u before using it.\n",
2067                        profile);
2068                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2069                        "for more information.\n");
2070                 panic("Profile %u (used by '%s') not defined.\n",
2071                       profile, domain->domainname->name);
2072         }
2073         tomoyo_read_unlock(idx);
2074         if (tomoyo_profile_version != 20090903) {
2075                 printk(KERN_ERR "You need to install userland programs for "
2076                        "TOMOYO 2.3 and initialize policy configuration.\n");
2077                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2078                        "for more information.\n");
2079                 panic("Profile version %u is not supported.\n",
2080                       tomoyo_profile_version);
2081         }
2082         printk(KERN_INFO "TOMOYO: 2.3.0\n");
2083         printk(KERN_INFO "Mandatory Access Control activated.\n");
2084 }