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 /* Profile version. Currently only 20090903 is defined. */
  15 static unsigned int tomoyo_profile_version;
  16
  17 /* Profile table. Memory is allocated as needed. */
  18 static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
  19
  20 /* String table for operation mode. */
  21 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
  22         [TOMOYO_CONFIG_DISABLED]   = "disabled",
  23         [TOMOYO_CONFIG_LEARNING]   = "learning",
  24         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
  25         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
  26 };
  27
  28 /* String table for /sys/kernel/security/tomoyo/profile */
  29 static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
  30                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
  31         [TOMOYO_MAC_FILE_EXECUTE]    = "file::execute",
  32         [TOMOYO_MAC_FILE_OPEN]       = "file::open",
  33         [TOMOYO_MAC_FILE_CREATE]     = "file::create",
  34         [TOMOYO_MAC_FILE_UNLINK]     = "file::unlink",
  35         [TOMOYO_MAC_FILE_GETATTR]    = "file::getattr",
  36         [TOMOYO_MAC_FILE_MKDIR]      = "file::mkdir",
  37         [TOMOYO_MAC_FILE_RMDIR]      = "file::rmdir",
  38         [TOMOYO_MAC_FILE_MKFIFO]     = "file::mkfifo",
  39         [TOMOYO_MAC_FILE_MKSOCK]     = "file::mksock",
  40         [TOMOYO_MAC_FILE_TRUNCATE]   = "file::truncate",
  41         [TOMOYO_MAC_FILE_SYMLINK]    = "file::symlink",
  42         [TOMOYO_MAC_FILE_MKBLOCK]    = "file::mkblock",
  43         [TOMOYO_MAC_FILE_MKCHAR]     = "file::mkchar",
  44         [TOMOYO_MAC_FILE_LINK]       = "file::link",
  45         [TOMOYO_MAC_FILE_RENAME]     = "file::rename",
  46         [TOMOYO_MAC_FILE_CHMOD]      = "file::chmod",
  47         [TOMOYO_MAC_FILE_CHOWN]      = "file::chown",
  48         [TOMOYO_MAC_FILE_CHGRP]      = "file::chgrp",
  49         [TOMOYO_MAC_FILE_IOCTL]      = "file::ioctl",
  50         [TOMOYO_MAC_FILE_CHROOT]     = "file::chroot",
  51         [TOMOYO_MAC_FILE_MOUNT]      = "file::mount",
  52         [TOMOYO_MAC_FILE_UMOUNT]     = "file::unmount",
  53         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
  54         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  55 };
  56
  57 /* String table for PREFERENCE keyword. */
  58 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
  59         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
  60         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
  61 };
  62
  63 /* Permit policy management by non-root user? */
  64 static bool tomoyo_manage_by_non_root;
  65
  66 /* Utility functions. */
  67
  68 /**
  69  * tomoyo_yesno - Return "yes" or "no".
  70  *
  71  * @value: Bool value.
  72  */
  73 const char *tomoyo_yesno(const unsigned int value)
  74 {
  75         return value ? "yes" : "no";
  76 }
  77
  78 /**
  79  * tomoyo_addprintf - strncat()-like-snprintf().
  80  *
  81  * @buffer: Buffer to write to. Must be '\0'-terminated.
  82  * @len:    Size of @buffer.
  83  * @fmt:    The printf()'s format string, followed by parameters.
  84  *
  85  * Returns nothing.
  86  */
  87 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
  88 {
  89         va_list args;
  90         const int pos = strlen(buffer);
  91         va_start(args, fmt);
  92         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
  93         va_end(args);
  94 }
  95
  96 /**
  97  * tomoyo_flush - Flush queued string to userspace's buffer.
  98  *
  99  * @head:   Pointer to "struct tomoyo_io_buffer".
 100  *
 101  * Returns true if all data was flushed, false otherwise.
 102  */
 103 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 104 {
 105         while (head->r.w_pos) {
 106                 const char *w = head->r.w[0];
 107                 int len = strlen(w);
 108                 if (len) {
 109                         if (len > head->read_user_buf_avail)
 110                                 len = head->read_user_buf_avail;
 111                         if (!len)
 112                                 return false;
 113                         if (copy_to_user(head->read_user_buf, w, len))
 114                                 return false;
 115                         head->read_user_buf_avail -= len;
 116                         head->read_user_buf += len;
 117                         w += len;
 118                 }
 119                 head->r.w[0] = w;
 120                 if (*w)
 121                         return false;
 122                 /* Add '\0' for audit logs and query. */
 123                 if (head->poll) {
 124                         if (!head->read_user_buf_avail ||
 125                             copy_to_user(head->read_user_buf, "", 1))
 126                                 return false;
 127                         head->read_user_buf_avail--;
 128                         head->read_user_buf++;
 129                 }
 130                 head->r.w_pos--;
 131                 for (len = 0; len < head->r.w_pos; len++)
 132                         head->r.w[len] = head->r.w[len + 1];
 133         }
 134         head->r.avail = 0;
 135         return true;
 136 }
 137
 138 /**
 139  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 140  *
 141  * @head:   Pointer to "struct tomoyo_io_buffer".
 142  * @string: String to print.
 143  *
 144  * Note that @string has to be kept valid until @head is kfree()d.
 145  * This means that char[] allocated on stack memory cannot be passed to
 146  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 147  */
 148 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 149 {
 150         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 151                 head->r.w[head->r.w_pos++] = string;
 152                 tomoyo_flush(head);
 153         } else
 154                 WARN_ON(1);
 155 }
 156
 157 /**
 158  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 159  *
 160  * @head: Pointer to "struct tomoyo_io_buffer".
 161  * @fmt:  The printf()'s format string, followed by parameters.
 162  */
 163 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 164 {
 165         va_list args;
 166         int len;
 167         int pos = head->r.avail;
 168         int size = head->readbuf_size - pos;
 169         if (size <= 0)
 170                 return;
 171         va_start(args, fmt);
 172         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 173         va_end(args);
 174         if (pos + len >= head->readbuf_size) {
 175                 WARN_ON(1);
 176                 return;
 177         }
 178         head->r.avail += len;
 179         tomoyo_set_string(head, head->read_buf + pos);
 180 }
 181
 182 /**
 183  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 184  *
 185  * @head: Pointer to "struct tomoyo_io_buffer".
 186  *
 187  * Returns nothing.
 188  */
 189 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 190 {
 191         tomoyo_set_string(head, " ");
 192 }
 193
 194 /**
 195  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 196  *
 197  * @head: Pointer to "struct tomoyo_io_buffer".
 198  *
 199  * Returns nothing.
 200  */
 201 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 202 {
 203         tomoyo_set_string(head, "\n");
 204         return !head->r.w_pos;
 205 }
 206
 207 /**
 208  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 209  *
 210  * @head: Pointer to "struct tomoyo_io_buffer".
 211  *
 212  * Returns nothing.
 213  */
 214 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 215 {
 216         tomoyo_set_string(head, "/");
 217 }
 218
 219 /**
 220  * tomoyo_print_name_union - Print a tomoyo_name_union.
 221  *
 222  * @head: Pointer to "struct tomoyo_io_buffer".
 223  * @ptr:  Pointer to "struct tomoyo_name_union".
 224  */
 225 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 226                                     const struct tomoyo_name_union *ptr)
 227 {
 228         tomoyo_set_space(head);
 229         if (ptr->group) {
 230                 tomoyo_set_string(head, "@");
 231                 tomoyo_set_string(head, ptr->group->group_name->name);
 232         } else {
 233                 tomoyo_set_string(head, ptr->filename->name);
 234         }
 235 }
 236
 237 /**
 238  * tomoyo_print_number_union - Print a tomoyo_number_union.
 239  *
 240  * @head:       Pointer to "struct tomoyo_io_buffer".
 241  * @ptr:        Pointer to "struct tomoyo_number_union".
 242  */
 243 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 244                                       const struct tomoyo_number_union *ptr)
 245 {
 246         tomoyo_set_space(head);
 247         if (ptr->group) {
 248                 tomoyo_set_string(head, "@");
 249                 tomoyo_set_string(head, ptr->group->group_name->name);
 250         } else {
 251                 int i;
 252                 unsigned long min = ptr->values[0];
 253                 const unsigned long max = ptr->values[1];
 254                 u8 min_type = ptr->value_type[0];
 255                 const u8 max_type = ptr->value_type[1];
 256                 char buffer[128];
 257                 buffer[0] = '\0';
 258                 for (i = 0; i < 2; i++) {
 259                         switch (min_type) {
 260                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 261                                 tomoyo_addprintf(buffer, sizeof(buffer),
 262                                                  "0x%lX", min);
 263                                 break;
 264                         case TOMOYO_VALUE_TYPE_OCTAL:
 265                                 tomoyo_addprintf(buffer, sizeof(buffer),
 266                                                  "0%lo", min);
 267                                 break;
 268                         default:
 269                                 tomoyo_addprintf(buffer, sizeof(buffer),
 270                                                  "%lu", min);
 271                                 break;
 272                         }
 273                         if (min == max && min_type == max_type)
 274                                 break;
 275                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 276                         min_type = max_type;
 277                         min = max;
 278                 }
 279                 tomoyo_io_printf(head, "%s", buffer);
 280         }
 281 }
 282
 283 /**
 284  * tomoyo_assign_profile - Create a new profile.
 285  *
 286  * @profile: Profile number to create.
 287  *
 288  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 289  */
 290 static struct tomoyo_profile *tomoyo_assign_profile(const unsigned int profile)
 291 {
 292         struct tomoyo_profile *ptr;
 293         struct tomoyo_profile *entry;
 294         if (profile >= TOMOYO_MAX_PROFILES)
 295                 return NULL;
 296         ptr = tomoyo_profile_ptr[profile];
 297         if (ptr)
 298                 return ptr;
 299         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 300         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 301                 goto out;
 302         ptr = tomoyo_profile_ptr[profile];
 303         if (!ptr && tomoyo_memory_ok(entry)) {
 304                 ptr = entry;
 305                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 306                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 307                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 308                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 309                        sizeof(ptr->config));
 310                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
 311                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
 312                 mb(); /* Avoid out-of-order execution. */
 313                 tomoyo_profile_ptr[profile] = ptr;
 314                 entry = NULL;
 315         }
 316         mutex_unlock(&tomoyo_policy_lock);
 317  out:
 318         kfree(entry);
 319         return ptr;
 320 }
 321
 322 /**
 323  * tomoyo_profile - Find a profile.
 324  *
 325  * @profile: Profile number to find.
 326  *
 327  * Returns pointer to "struct tomoyo_profile".
 328  */
 329 struct tomoyo_profile *tomoyo_profile(const u8 profile)
 330 {
 331         static struct tomoyo_profile tomoyo_null_profile;
 332         struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
 333         if (!ptr)
 334                 ptr = &tomoyo_null_profile;
 335         return ptr;
 336 }
 337
 338 /**
 339  * tomoyo_find_yesno - Find values for specified keyword.
 340  *
 341  * @string: String to check.
 342  * @find:   Name of keyword.
 343  *
 344  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 345  */
 346 static s8 tomoyo_find_yesno(const char *string, const char *find)
 347 {
 348         const char *cp = strstr(string, find);
 349         if (cp) {
 350                 cp += strlen(find);
 351                 if (!strncmp(cp, "=yes", 4))
 352                         return 1;
 353                 else if (!strncmp(cp, "=no", 3))
 354                         return 0;
 355         }
 356         return -1;
 357 }
 358
 359 /**
 360  * tomoyo_set_uint - Set value for specified preference.
 361  *
 362  * @i:      Pointer to "unsigned int".
 363  * @string: String to check.
 364  * @find:   Name of keyword.
 365  *
 366  * Returns nothing.
 367  */
 368 static void tomoyo_set_uint(unsigned int *i, const char *string,
 369                             const char *find)
 370 {
 371         const char *cp = strstr(string, find);
 372         if (cp)
 373                 sscanf(cp + strlen(find), "=%u", i);
 374 }
 375
 376 /**
 377  * tomoyo_set_mode - Set mode for specified profile.
 378  *
 379  * @name:    Name of functionality.
 380  * @value:   Mode for @name.
 381  * @profile: Pointer to "struct tomoyo_profile".
 382  *
 383  * Returns 0 on success, negative value otherwise.
 384  */
 385 static int tomoyo_set_mode(char *name, const char *value,
 386                            struct tomoyo_profile *profile)
 387 {
 388         u8 i;
 389         u8 config;
 390         if (!strcmp(name, "CONFIG")) {
 391                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 392                 config = profile->default_config;
 393         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 394                 config = 0;
 395                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 396                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 397                         if (strcmp(name, tomoyo_mac_keywords[i]))
 398                                 continue;
 399                         config = profile->config[i];
 400                         break;
 401                 }
 402                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 403                         return -EINVAL;
 404         } else {
 405                 return -EINVAL;
 406         }
 407         if (strstr(value, "use_default")) {
 408                 config = TOMOYO_CONFIG_USE_DEFAULT;
 409         } else {
 410                 u8 mode;
 411                 for (mode = 0; mode < 4; mode++)
 412                         if (strstr(value, tomoyo_mode[mode]))
 413                                 /*
 414                                  * Update lower 3 bits in order to distinguish
 415                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 416                                  */
 417                                 config = (config & ~7) | mode;
 418                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 419                         switch (tomoyo_find_yesno(value, "grant_log")) {
 420                         case 1:
 421                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 422                                 break;
 423                         case 0:
 424                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 425                                 break;
 426                         }
 427                         switch (tomoyo_find_yesno(value, "reject_log")) {
 428                         case 1:
 429                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 430                                 break;
 431                         case 0:
 432                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 433                                 break;
 434                         }
 435                 }
 436         }
 437         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 438                 profile->config[i] = config;
 439         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 440                 profile->default_config = config;
 441         return 0;
 442 }
 443
 444 /**
 445  * tomoyo_write_profile - Write profile table.
 446  *
 447  * @head: Pointer to "struct tomoyo_io_buffer".
 448  *
 449  * Returns 0 on success, negative value otherwise.
 450  */
 451 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 452 {
 453         char *data = head->write_buf;
 454         unsigned int i;
 455         char *cp;
 456         struct tomoyo_profile *profile;
 457         if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
 458                 return 0;
 459         i = simple_strtoul(data, &cp, 10);
 460         if (*cp != '-')
 461                 return -EINVAL;
 462         data = cp + 1;
 463         profile = tomoyo_assign_profile(i);
 464         if (!profile)
 465                 return -EINVAL;
 466         cp = strchr(data, '=');
 467         if (!cp)
 468                 return -EINVAL;
 469         *cp++ = '\0';
 470         if (!strcmp(data, "COMMENT")) {
 471                 static DEFINE_SPINLOCK(lock);
 472                 const struct tomoyo_path_info *new_comment
 473                         = tomoyo_get_name(cp);
 474                 const struct tomoyo_path_info *old_comment;
 475                 if (!new_comment)
 476                         return -ENOMEM;
 477                 spin_lock(&lock);
 478                 old_comment = profile->comment;
 479                 profile->comment = new_comment;
 480                 spin_unlock(&lock);
 481                 tomoyo_put_name(old_comment);
 482                 return 0;
 483         }
 484         if (!strcmp(data, "PREFERENCE")) {
 485                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 486                         tomoyo_set_uint(&profile->pref[i], cp,
 487                                         tomoyo_pref_keywords[i]);
 488                 return 0;
 489         }
 490         return tomoyo_set_mode(data, cp, profile);
 491 }
 492
 493 /**
 494  * tomoyo_print_config - Print mode for specified functionality.
 495  *
 496  * @head:   Pointer to "struct tomoyo_io_buffer".
 497  * @config: Mode for that functionality.
 498  *
 499  * Returns nothing.
 500  *
 501  * Caller prints functionality's name.
 502  */
 503 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 504 {
 505         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 506                          tomoyo_mode[config & 3],
 507                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 508                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 509 }
 510
 511 /**
 512  * tomoyo_read_profile - Read profile table.
 513  *
 514  * @head: Pointer to "struct tomoyo_io_buffer".
 515  *
 516  * Returns nothing.
 517  */
 518 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 519 {
 520         u8 index;
 521         const struct tomoyo_profile *profile;
 522  next:
 523         index = head->r.index;
 524         profile = tomoyo_profile_ptr[index];
 525         switch (head->r.step) {
 526         case 0:
 527                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n", 20090903);
 528                 head->r.step++;
 529                 break;
 530         case 1:
 531                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 532                       head->r.index++)
 533                         if (tomoyo_profile_ptr[head->r.index])
 534                                 break;
 535                 if (head->r.index == TOMOYO_MAX_PROFILES)
 536                         return;
 537                 head->r.step++;
 538                 break;
 539         case 2:
 540                 {
 541                         u8 i;
 542                         const struct tomoyo_path_info *comment =
 543                                 profile->comment;
 544                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 545                         tomoyo_set_string(head, comment ? comment->name : "");
 546                         tomoyo_set_lf(head);
 547                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 548                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 549                                 tomoyo_io_printf(head, "%s=%u ",
 550                                                  tomoyo_pref_keywords[i],
 551                                                  profile->pref[i]);
 552                         tomoyo_set_string(head, "}\n");
 553                         head->r.step++;
 554                 }
 555                 break;
 556         case 3:
 557                 {
 558                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 559                         tomoyo_print_config(head, profile->default_config);
 560                         head->r.bit = 0;
 561                         head->r.step++;
 562                 }
 563                 break;
 564         case 4:
 565                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 566                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 567                         const u8 i = head->r.bit;
 568                         const u8 config = profile->config[i];
 569                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 570                                 continue;
 571                         tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::",
 572                                          tomoyo_mac_keywords[i]);
 573                         tomoyo_print_config(head, config);
 574                         head->r.bit++;
 575                         break;
 576                 }
 577                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 578                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 579                         head->r.index++;
 580                         head->r.step = 1;
 581                 }
 582                 break;
 583         }
 584         if (tomoyo_flush(head))
 585                 goto next;
 586 }
 587
 588 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 589                                 const struct tomoyo_acl_head *b)
 590 {
 591         return container_of(a, struct tomoyo_manager, head)->manager ==
 592                 container_of(b, struct tomoyo_manager, head)->manager;
 593 }
 594
 595 /**
 596  * tomoyo_update_manager_entry - Add a manager entry.
 597  *
 598  * @manager:   The path to manager or the domainnamme.
 599  * @is_delete: True if it is a delete request.
 600  *
 601  * Returns 0 on success, negative value otherwise.
 602  *
 603  * Caller holds tomoyo_read_lock().
 604  */
 605 static int tomoyo_update_manager_entry(const char *manager,
 606                                        const bool is_delete)
 607 {
 608         struct tomoyo_manager e = { };
 609         struct tomoyo_acl_param param = {
 610                 .is_delete = is_delete,
 611                 .list = &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 612         };
 613         int error = is_delete ? -ENOENT : -ENOMEM;
 614         if (tomoyo_domain_def(manager)) {
 615                 if (!tomoyo_correct_domain(manager))
 616                         return -EINVAL;
 617                 e.is_domain = true;
 618         } else {
 619                 if (!tomoyo_correct_path(manager))
 620                         return -EINVAL;
 621         }
 622         e.manager = tomoyo_get_name(manager);
 623         if (e.manager) {
 624                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 625                                              tomoyo_same_manager);
 626                 tomoyo_put_name(e.manager);
 627         }
 628         return error;
 629 }
 630
 631 /**
 632  * tomoyo_write_manager - Write manager policy.
 633  *
 634  * @head: Pointer to "struct tomoyo_io_buffer".
 635  *
 636  * Returns 0 on success, negative value otherwise.
 637  *
 638  * Caller holds tomoyo_read_lock().
 639  */
 640 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 641 {
 642         char *data = head->write_buf;
 643         bool is_delete = tomoyo_str_starts(&data, "delete ");
 644
 645         if (!strcmp(data, "manage_by_non_root")) {
 646                 tomoyo_manage_by_non_root = !is_delete;
 647                 return 0;
 648         }
 649         return tomoyo_update_manager_entry(data, is_delete);
 650 }
 651
 652 /**
 653  * tomoyo_read_manager - Read manager policy.
 654  *
 655  * @head: Pointer to "struct tomoyo_io_buffer".
 656  *
 657  * Caller holds tomoyo_read_lock().
 658  */
 659 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 660 {
 661         if (head->r.eof)
 662                 return;
 663         list_for_each_cookie(head->r.acl,
 664                              &tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
 665                 struct tomoyo_manager *ptr =
 666                         list_entry(head->r.acl, typeof(*ptr), head.list);
 667                 if (ptr->head.is_deleted)
 668                         continue;
 669                 if (!tomoyo_flush(head))
 670                         return;
 671                 tomoyo_set_string(head, ptr->manager->name);
 672                 tomoyo_set_lf(head);
 673         }
 674         head->r.eof = true;
 675 }
 676
 677 /**
 678  * tomoyo_manager - Check whether the current process is a policy manager.
 679  *
 680  * Returns true if the current process is permitted to modify policy
 681  * via /sys/kernel/security/tomoyo/ interface.
 682  *
 683  * Caller holds tomoyo_read_lock().
 684  */
 685 static bool tomoyo_manager(void)
 686 {
 687         struct tomoyo_manager *ptr;
 688         const char *exe;
 689         const struct task_struct *task = current;
 690         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 691         bool found = false;
 692
 693         if (!tomoyo_policy_loaded)
 694                 return true;
 695         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 696                 return false;
 697         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 698                                 head.list) {
 699                 if (!ptr->head.is_deleted && ptr->is_domain
 700                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 701                         found = true;
 702                         break;
 703                 }
 704         }
 705         if (found)
 706                 return true;
 707         exe = tomoyo_get_exe();
 708         if (!exe)
 709                 return false;
 710         list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
 711                                 head.list) {
 712                 if (!ptr->head.is_deleted && !ptr->is_domain
 713                     && !strcmp(exe, ptr->manager->name)) {
 714                         found = true;
 715                         break;
 716                 }
 717         }
 718         if (!found) { /* Reduce error messages. */
 719                 static pid_t last_pid;
 720                 const pid_t pid = current->pid;
 721                 if (last_pid != pid) {
 722                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 723                                "update policies.\n", domainname->name, exe);
 724                         last_pid = pid;
 725                 }
 726         }
 727         kfree(exe);
 728         return found;
 729 }
 730
 731 /**
 732  * tomoyo_select_one - Parse select command.
 733  *
 734  * @head: Pointer to "struct tomoyo_io_buffer".
 735  * @data: String to parse.
 736  *
 737  * Returns true on success, false otherwise.
 738  *
 739  * Caller holds tomoyo_read_lock().
 740  */
 741 static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
 742 {
 743         unsigned int pid;
 744         struct tomoyo_domain_info *domain = NULL;
 745         bool global_pid = false;
 746
 747         if (!strcmp(data, "allow_execute")) {
 748                 head->r.print_execute_only = true;
 749                 return true;
 750         }
 751         if (sscanf(data, "pid=%u", &pid) == 1 ||
 752             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 753                 struct task_struct *p;
 754                 rcu_read_lock();
 755                 read_lock(&tasklist_lock);
 756                 if (global_pid)
 757                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 758                 else
 759                         p = find_task_by_vpid(pid);
 760                 if (p)
 761                         domain = tomoyo_real_domain(p);
 762                 read_unlock(&tasklist_lock);
 763                 rcu_read_unlock();
 764         } else if (!strncmp(data, "domain=", 7)) {
 765                 if (tomoyo_domain_def(data + 7))
 766                         domain = tomoyo_find_domain(data + 7);
 767         } else
 768                 return false;
 769         head->w.domain = domain;
 770         /* Accessing read_buf is safe because head->io_sem is held. */
 771         if (!head->read_buf)
 772                 return true; /* Do nothing if open(O_WRONLY). */
 773         memset(&head->r, 0, sizeof(head->r));
 774         head->r.print_this_domain_only = true;
 775         if (domain)
 776                 head->r.domain = &domain->list;
 777         else
 778                 head->r.eof = 1;
 779         tomoyo_io_printf(head, "# select %s\n", data);
 780         if (domain && domain->is_deleted)
 781                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 782         return true;
 783 }
 784
 785 /**
 786  * tomoyo_delete_domain - Delete a domain.
 787  *
 788  * @domainname: The name of domain.
 789  *
 790  * Returns 0.
 791  *
 792  * Caller holds tomoyo_read_lock().
 793  */
 794 static int tomoyo_delete_domain(char *domainname)
 795 {
 796         struct tomoyo_domain_info *domain;
 797         struct tomoyo_path_info name;
 798
 799         name.name = domainname;
 800         tomoyo_fill_path_info(&name);
 801         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 802                 return 0;
 803         /* Is there an active domain? */
 804         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 805                 /* Never delete tomoyo_kernel_domain */
 806                 if (domain == &tomoyo_kernel_domain)
 807                         continue;
 808                 if (domain->is_deleted ||
 809                     tomoyo_pathcmp(domain->domainname, &name))
 810                         continue;
 811                 domain->is_deleted = true;
 812                 break;
 813         }
 814         mutex_unlock(&tomoyo_policy_lock);
 815         return 0;
 816 }
 817
 818 /**
 819  * tomoyo_write_domain2 - Write domain policy.
 820  *
 821  * @list:      Pointer to "struct list_head".
 822  * @data:      Policy to be interpreted.
 823  * @is_delete: True if it is a delete request.
 824  *
 825  * Returns 0 on success, negative value otherwise.
 826  *
 827  * Caller holds tomoyo_read_lock().
 828  */
 829 static int tomoyo_write_domain2(struct list_head *list, char *data,
 830                                 const bool is_delete)
 831 {
 832         struct tomoyo_acl_param param = {
 833                 .list = list,
 834                 .data = data,
 835                 .is_delete = is_delete,
 836         };
 837         static const struct {
 838                 const char *keyword;
 839                 int (*write) (struct tomoyo_acl_param *);
 840         } tomoyo_callback[1] = {
 841                 { "file ", tomoyo_write_file },
 842         };
 843         u8 i;
 844         for (i = 0; i < 1; i++) {
 845                 if (!tomoyo_str_starts(&param.data,
 846                                        tomoyo_callback[i].keyword))
 847                         continue;
 848                 return tomoyo_callback[i].write(&param);
 849         }
 850         return -EINVAL;
 851 }
 852
 853 /**
 854  * tomoyo_write_domain - Write domain policy.
 855  *
 856  * @head: Pointer to "struct tomoyo_io_buffer".
 857  *
 858  * Returns 0 on success, negative value otherwise.
 859  *
 860  * Caller holds tomoyo_read_lock().
 861  */
 862 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
 863 {
 864         char *data = head->write_buf;
 865         struct tomoyo_domain_info *domain = head->w.domain;
 866         bool is_delete = false;
 867         bool is_select = false;
 868         unsigned int profile;
 869
 870         if (tomoyo_str_starts(&data, "delete "))
 871                 is_delete = true;
 872         else if (tomoyo_str_starts(&data, "select "))
 873                 is_select = true;
 874         if (is_select && tomoyo_select_one(head, data))
 875                 return 0;
 876         /* Don't allow updating policies by non manager programs. */
 877         if (!tomoyo_manager())
 878                 return -EPERM;
 879         if (tomoyo_domain_def(data)) {
 880                 domain = NULL;
 881                 if (is_delete)
 882                         tomoyo_delete_domain(data);
 883                 else if (is_select)
 884                         domain = tomoyo_find_domain(data);
 885                 else
 886                         domain = tomoyo_assign_domain(data, 0);
 887                 head->w.domain = domain;
 888                 return 0;
 889         }
 890         if (!domain)
 891                 return -EINVAL;
 892
 893         if (sscanf(data, "use_profile %u", &profile) == 1
 894             && profile < TOMOYO_MAX_PROFILES) {
 895                 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
 896                         domain->profile = (u8) profile;
 897                 return 0;
 898         }
 899         if (!strcmp(data, "quota_exceeded")) {
 900                 domain->quota_warned = !is_delete;
 901                 return 0;
 902         }
 903         if (!strcmp(data, "transition_failed")) {
 904                 domain->transition_failed = !is_delete;
 905                 return 0;
 906         }
 907         return tomoyo_write_domain2(&domain->acl_info_list, data, is_delete);
 908 }
 909
 910 /**
 911  * tomoyo_set_group - Print category name.
 912  *
 913  * @head:     Pointer to "struct tomoyo_io_buffer".
 914  * @category: Category name.
 915  *
 916  * Returns nothing.
 917  */
 918 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
 919                              const char *category)
 920 {
 921         tomoyo_set_string(head, category);
 922 }
 923
 924 /**
 925  * tomoyo_print_entry - Print an ACL entry.
 926  *
 927  * @head: Pointer to "struct tomoyo_io_buffer".
 928  * @acl:  Pointer to an ACL entry.
 929  *
 930  * Returns true on success, false otherwise.
 931  */
 932 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
 933                                struct tomoyo_acl_info *acl)
 934 {
 935         const u8 acl_type = acl->type;
 936         bool first = true;
 937         u8 bit;
 938
 939         if (acl->is_deleted)
 940                 return true;
 941         if (!tomoyo_flush(head))
 942                 return false;
 943         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
 944                 struct tomoyo_path_acl *ptr =
 945                         container_of(acl, typeof(*ptr), head);
 946                 const u16 perm = ptr->perm;
 947                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
 948                         if (!(perm & (1 << bit)))
 949                                 continue;
 950                         if (head->r.print_execute_only &&
 951                             bit != TOMOYO_TYPE_EXECUTE)
 952                                 continue;
 953                         if (first) {
 954                                 tomoyo_set_group(head, "file ");
 955                                 first = false;
 956                         } else {
 957                                 tomoyo_set_slash(head);
 958                         }
 959                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
 960                 }
 961                 if (first)
 962                         return true;
 963                 tomoyo_print_name_union(head, &ptr->name);
 964         } else if (head->r.print_execute_only) {
 965                 return true;
 966         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
 967                 struct tomoyo_path2_acl *ptr =
 968                         container_of(acl, typeof(*ptr), head);
 969                 const u8 perm = ptr->perm;
 970                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
 971                         if (!(perm & (1 << bit)))
 972                                 continue;
 973                         if (first) {
 974                                 tomoyo_set_group(head, "file ");
 975                                 first = false;
 976                         } else {
 977                                 tomoyo_set_slash(head);
 978                         }
 979                         tomoyo_set_string(head, tomoyo_mac_keywords
 980                                           [tomoyo_pp2mac[bit]]);
 981                 }
 982                 if (first)
 983                         return true;
 984                 tomoyo_print_name_union(head, &ptr->name1);
 985                 tomoyo_print_name_union(head, &ptr->name2);
 986         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
 987                 struct tomoyo_path_number_acl *ptr =
 988                         container_of(acl, typeof(*ptr), head);
 989                 const u8 perm = ptr->perm;
 990                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
 991                         if (!(perm & (1 << bit)))
 992                                 continue;
 993                         if (first) {
 994                                 tomoyo_set_group(head, "file ");
 995                                 first = false;
 996                         } else {
 997                                 tomoyo_set_slash(head);
 998                         }
 999                         tomoyo_set_string(head, tomoyo_mac_keywords
1000                                           [tomoyo_pn2mac[bit]]);
1001                 }
1002                 if (first)
1003                         return true;
1004                 tomoyo_print_name_union(head, &ptr->name);
1005                 tomoyo_print_number_union(head, &ptr->number);
1006         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1007                 struct tomoyo_mkdev_acl *ptr =
1008                         container_of(acl, typeof(*ptr), head);
1009                 const u8 perm = ptr->perm;
1010                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1011                         if (!(perm & (1 << bit)))
1012                                 continue;
1013                         if (first) {
1014                                 tomoyo_set_group(head, "file ");
1015                                 first = false;
1016                         } else {
1017                                 tomoyo_set_slash(head);
1018                         }
1019                         tomoyo_set_string(head, tomoyo_mac_keywords
1020                                           [tomoyo_pnnn2mac[bit]]);
1021                 }
1022                 if (first)
1023                         return true;
1024                 tomoyo_print_name_union(head, &ptr->name);
1025                 tomoyo_print_number_union(head, &ptr->mode);
1026                 tomoyo_print_number_union(head, &ptr->major);
1027                 tomoyo_print_number_union(head, &ptr->minor);
1028         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1029                 struct tomoyo_mount_acl *ptr =
1030                         container_of(acl, typeof(*ptr), head);
1031                 tomoyo_set_group(head, "file mount");
1032                 tomoyo_print_name_union(head, &ptr->dev_name);
1033                 tomoyo_print_name_union(head, &ptr->dir_name);
1034                 tomoyo_print_name_union(head, &ptr->fs_type);
1035                 tomoyo_print_number_union(head, &ptr->flags);
1036         }
1037         tomoyo_set_lf(head);
1038         return true;
1039 }
1040
1041 /**
1042  * tomoyo_read_domain2 - Read domain policy.
1043  *
1044  * @head:   Pointer to "struct tomoyo_io_buffer".
1045  * @domain: Pointer to "struct tomoyo_domain_info".
1046  *
1047  * Caller holds tomoyo_read_lock().
1048  *
1049  * Returns true on success, false otherwise.
1050  */
1051 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1052                                 struct tomoyo_domain_info *domain)
1053 {
1054         list_for_each_cookie(head->r.acl, &domain->acl_info_list) {
1055                 struct tomoyo_acl_info *ptr =
1056                         list_entry(head->r.acl, typeof(*ptr), list);
1057                 if (!tomoyo_print_entry(head, ptr))
1058                         return false;
1059         }
1060         head->r.acl = NULL;
1061         return true;
1062 }
1063
1064 /**
1065  * tomoyo_read_domain - Read domain policy.
1066  *
1067  * @head: Pointer to "struct tomoyo_io_buffer".
1068  *
1069  * Caller holds tomoyo_read_lock().
1070  */
1071 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1072 {
1073         if (head->r.eof)
1074                 return;
1075         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1076                 struct tomoyo_domain_info *domain =
1077                         list_entry(head->r.domain, typeof(*domain), list);
1078                 switch (head->r.step) {
1079                 case 0:
1080                         if (domain->is_deleted &&
1081                             !head->r.print_this_domain_only)
1082                                 continue;
1083                         /* Print domainname and flags. */
1084                         tomoyo_set_string(head, domain->domainname->name);
1085                         tomoyo_set_lf(head);
1086                         tomoyo_io_printf(head, "use_profile %u\n",
1087                                          domain->profile);
1088                         if (domain->quota_warned)
1089                                 tomoyo_set_string(head, "quota_exceeded\n");
1090                         if (domain->transition_failed)
1091                                 tomoyo_set_string(head, "transition_failed\n");
1092                         head->r.step++;
1093                         tomoyo_set_lf(head);
1094                         /* fall through */
1095                 case 1:
1096                         if (!tomoyo_read_domain2(head, domain))
1097                                 return;
1098                         head->r.step++;
1099                         if (!tomoyo_set_lf(head))
1100                                 return;
1101                         /* fall through */
1102                 case 2:
1103                         head->r.step = 0;
1104                         if (head->r.print_this_domain_only)
1105                                 goto done;
1106                 }
1107         }
1108  done:
1109         head->r.eof = true;
1110 }
1111
1112 /**
1113  * tomoyo_write_domain_profile - Assign profile for specified domain.
1114  *
1115  * @head: Pointer to "struct tomoyo_io_buffer".
1116  *
1117  * Returns 0 on success, -EINVAL otherwise.
1118  *
1119  * This is equivalent to doing
1120  *
1121  *     ( echo "select " $domainname; echo "use_profile " $profile ) |
1122  *     /usr/sbin/tomoyo-loadpolicy -d
1123  *
1124  * Caller holds tomoyo_read_lock().
1125  */
1126 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1127 {
1128         char *data = head->write_buf;
1129         char *cp = strchr(data, ' ');
1130         struct tomoyo_domain_info *domain;
1131         unsigned long profile;
1132
1133         if (!cp)
1134                 return -EINVAL;
1135         *cp = '\0';
1136         domain = tomoyo_find_domain(cp + 1);
1137         if (strict_strtoul(data, 10, &profile))
1138                 return -EINVAL;
1139         if (domain && profile < TOMOYO_MAX_PROFILES
1140             && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1141                 domain->profile = (u8) profile;
1142         return 0;
1143 }
1144
1145 /**
1146  * tomoyo_read_domain_profile - Read only domainname and profile.
1147  *
1148  * @head: Pointer to "struct tomoyo_io_buffer".
1149  *
1150  * Returns list of profile number and domainname pairs.
1151  *
1152  * This is equivalent to doing
1153  *
1154  *     grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1155  *     awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1156  *     domainname = $0; } else if ( $1 == "use_profile" ) {
1157  *     print $2 " " domainname; domainname = ""; } } ; '
1158  *
1159  * Caller holds tomoyo_read_lock().
1160  */
1161 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1162 {
1163         if (head->r.eof)
1164                 return;
1165         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1166                 struct tomoyo_domain_info *domain =
1167                         list_entry(head->r.domain, typeof(*domain), list);
1168                 if (domain->is_deleted)
1169                         continue;
1170                 if (!tomoyo_flush(head))
1171                         return;
1172                 tomoyo_io_printf(head, "%u ", domain->profile);
1173                 tomoyo_set_string(head, domain->domainname->name);
1174                 tomoyo_set_lf(head);
1175         }
1176         head->r.eof = true;
1177 }
1178
1179 /**
1180  * tomoyo_write_pid: Specify PID to obtain domainname.
1181  *
1182  * @head: Pointer to "struct tomoyo_io_buffer".
1183  *
1184  * Returns 0.
1185  */
1186 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1187 {
1188         head->r.eof = false;
1189         return 0;
1190 }
1191
1192 /**
1193  * tomoyo_read_pid - Get domainname of the specified PID.
1194  *
1195  * @head: Pointer to "struct tomoyo_io_buffer".
1196  *
1197  * Returns the domainname which the specified PID is in on success,
1198  * empty string otherwise.
1199  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1200  * using read()/write() interface rather than sysctl() interface.
1201  */
1202 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1203 {
1204         char *buf = head->write_buf;
1205         bool global_pid = false;
1206         unsigned int pid;
1207         struct task_struct *p;
1208         struct tomoyo_domain_info *domain = NULL;
1209
1210         /* Accessing write_buf is safe because head->io_sem is held. */
1211         if (!buf) {
1212                 head->r.eof = true;
1213                 return; /* Do nothing if open(O_RDONLY). */
1214         }
1215         if (head->r.w_pos || head->r.eof)
1216                 return;
1217         head->r.eof = true;
1218         if (tomoyo_str_starts(&buf, "global-pid "))
1219                 global_pid = true;
1220         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1221         rcu_read_lock();
1222         read_lock(&tasklist_lock);
1223         if (global_pid)
1224                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1225         else
1226                 p = find_task_by_vpid(pid);
1227         if (p)
1228                 domain = tomoyo_real_domain(p);
1229         read_unlock(&tasklist_lock);
1230         rcu_read_unlock();
1231         if (!domain)
1232                 return;
1233         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1234         tomoyo_set_string(head, domain->domainname->name);
1235 }
1236
1237 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1238         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain",
1239         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain",
1240         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain",
1241         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain",
1242 };
1243
1244 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1245         [TOMOYO_PATH_GROUP]   = "path_group ",
1246         [TOMOYO_NUMBER_GROUP] = "number_group ",
1247 };
1248
1249 /**
1250  * tomoyo_write_exception - Write exception policy.
1251  *
1252  * @head: Pointer to "struct tomoyo_io_buffer".
1253  *
1254  * Returns 0 on success, negative value otherwise.
1255  *
1256  * Caller holds tomoyo_read_lock().
1257  */
1258 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1259 {
1260         struct tomoyo_acl_param param = {
1261                 .data = head->write_buf,
1262         };
1263         u8 i;
1264         param.is_delete = tomoyo_str_starts(&param.data, "delete ");
1265         if (tomoyo_str_starts(&param.data, "aggregator "))
1266                 return tomoyo_write_aggregator(&param);
1267         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1268                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1269                         return tomoyo_write_transition_control(&param, i);
1270         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1271                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1272                         return tomoyo_write_group(&param, i);
1273         return -EINVAL;
1274 }
1275
1276 /**
1277  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1278  *
1279  * @head: Pointer to "struct tomoyo_io_buffer".
1280  * @idx:  Index number.
1281  *
1282  * Returns true on success, false otherwise.
1283  *
1284  * Caller holds tomoyo_read_lock().
1285  */
1286 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1287 {
1288         list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
1289                 struct tomoyo_group *group =
1290                         list_entry(head->r.group, typeof(*group), head.list);
1291                 list_for_each_cookie(head->r.acl, &group->member_list) {
1292                         struct tomoyo_acl_head *ptr =
1293                                 list_entry(head->r.acl, typeof(*ptr), list);
1294                         if (ptr->is_deleted)
1295                                 continue;
1296                         if (!tomoyo_flush(head))
1297                                 return false;
1298                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1299                         tomoyo_set_string(head, group->group_name->name);
1300                         if (idx == TOMOYO_PATH_GROUP) {
1301                                 tomoyo_set_space(head);
1302                                 tomoyo_set_string(head, container_of
1303                                                (ptr, struct tomoyo_path_group,
1304                                                 head)->member_name->name);
1305                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1306                                 tomoyo_print_number_union(head, &container_of
1307                                                           (ptr,
1308                                                    struct tomoyo_number_group,
1309                                                            head)->number);
1310                         }
1311                         tomoyo_set_lf(head);
1312                 }
1313                 head->r.acl = NULL;
1314         }
1315         head->r.group = NULL;
1316         return true;
1317 }
1318
1319 /**
1320  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1321  *
1322  * @head: Pointer to "struct tomoyo_io_buffer".
1323  * @idx:  Index number.
1324  *
1325  * Returns true on success, false otherwise.
1326  *
1327  * Caller holds tomoyo_read_lock().
1328  */
1329 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1330 {
1331         list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) {
1332                 struct tomoyo_acl_head *acl =
1333                         container_of(head->r.acl, typeof(*acl), list);
1334                 if (acl->is_deleted)
1335                         continue;
1336                 if (!tomoyo_flush(head))
1337                         return false;
1338                 switch (idx) {
1339                 case TOMOYO_ID_TRANSITION_CONTROL:
1340                         {
1341                                 struct tomoyo_transition_control *ptr =
1342                                         container_of(acl, typeof(*ptr), head);
1343                                 tomoyo_set_string(head, tomoyo_transition_type
1344                                                   [ptr->type]);
1345                                 tomoyo_set_string(head, ptr->program ?
1346                                                   ptr->program->name : "any");
1347                                 tomoyo_set_string(head, " from ");
1348                                 tomoyo_set_string(head, ptr->domainname ?
1349                                                   ptr->domainname->name :
1350                                                   "any");
1351                         }
1352                         break;
1353                 case TOMOYO_ID_AGGREGATOR:
1354                         {
1355                                 struct tomoyo_aggregator *ptr =
1356                                         container_of(acl, typeof(*ptr), head);
1357                                 tomoyo_set_string(head, "aggregator ");
1358                                 tomoyo_set_string(head,
1359                                                   ptr->original_name->name);
1360                                 tomoyo_set_space(head);
1361                                 tomoyo_set_string(head,
1362                                                ptr->aggregated_name->name);
1363                         }
1364                         break;
1365                 default:
1366                         continue;
1367                 }
1368                 tomoyo_set_lf(head);
1369         }
1370         head->r.acl = NULL;
1371         return true;
1372 }
1373
1374 /**
1375  * tomoyo_read_exception - Read exception policy.
1376  *
1377  * @head: Pointer to "struct tomoyo_io_buffer".
1378  *
1379  * Caller holds tomoyo_read_lock().
1380  */
1381 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1382 {
1383         if (head->r.eof)
1384                 return;
1385         while (head->r.step < TOMOYO_MAX_POLICY &&
1386                tomoyo_read_policy(head, head->r.step))
1387                 head->r.step++;
1388         if (head->r.step < TOMOYO_MAX_POLICY)
1389                 return;
1390         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1391                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1392                 head->r.step++;
1393         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1394                 return;
1395         head->r.eof = true;
1396 }
1397
1398 /* Wait queue for kernel -> userspace notification. */
1399 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1400 /* Wait queue for userspace -> kernel notification. */
1401 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1402
1403 /* Structure for query. */
1404 struct tomoyo_query {
1405         struct list_head list;
1406         char *query;
1407         size_t query_len;
1408         unsigned int serial;
1409         u8 timer;
1410         u8 answer;
1411         u8 retry;
1412 };
1413
1414 /* The list for "struct tomoyo_query". */
1415 static LIST_HEAD(tomoyo_query_list);
1416
1417 /* Lock for manipulating tomoyo_query_list. */
1418 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1419
1420 /*
1421  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1422  * interface.
1423  */
1424 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1425
1426 /**
1427  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1428  *
1429  * @domain: Pointer to "struct tomoyo_domain_info".
1430  * @header: Lines containing ACL.
1431  *
1432  * Returns nothing.
1433  */
1434 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1435 {
1436         char *buffer;
1437         char *cp = strchr(header, '\n');
1438         int len;
1439         if (!cp)
1440                 return;
1441         cp = strchr(cp + 1, '\n');
1442         if (!cp)
1443                 return;
1444         *cp++ = '\0';
1445         len = strlen(cp) + 1;
1446         buffer = kmalloc(len, GFP_NOFS);
1447         if (!buffer)
1448                 return;
1449         snprintf(buffer, len - 1, "%s", cp);
1450         tomoyo_normalize_line(buffer);
1451         tomoyo_write_domain2(&domain->acl_info_list, buffer, false);
1452         kfree(buffer);
1453 }
1454
1455 /**
1456  * tomoyo_supervisor - Ask for the supervisor's decision.
1457  *
1458  * @r:   Pointer to "struct tomoyo_request_info".
1459  * @fmt: The printf()'s format string, followed by parameters.
1460  *
1461  * Returns 0 if the supervisor decided to permit the access request which
1462  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1463  * supervisor decided to retry the access request which violated the policy in
1464  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1465  */
1466 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1467 {
1468         va_list args;
1469         int error;
1470         int len;
1471         static unsigned int tomoyo_serial;
1472         struct tomoyo_query entry = { };
1473         bool quota_exceeded = false;
1474         va_start(args, fmt);
1475         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
1476         va_end(args);
1477         /* Write /sys/kernel/security/tomoyo/audit. */
1478         va_start(args, fmt);
1479         tomoyo_write_log2(r, len, fmt, args);
1480         va_end(args);
1481         /* Nothing more to do if granted. */
1482         if (r->granted)
1483                 return 0;
1484         switch (r->mode) {
1485         case TOMOYO_CONFIG_ENFORCING:
1486                 error = -EPERM;
1487                 if (atomic_read(&tomoyo_query_observers))
1488                         break;
1489                 goto out;
1490         case TOMOYO_CONFIG_LEARNING:
1491                 error = 0;
1492                 /* Check max_learning_entry parameter. */
1493                 if (tomoyo_domain_quota_is_ok(r))
1494                         break;
1495                 /* fall through */
1496         default:
1497                 return 0;
1498         }
1499         /* Get message. */
1500         va_start(args, fmt);
1501         entry.query = tomoyo_init_log(r, len, fmt, args);
1502         va_end(args);
1503         if (!entry.query)
1504                 goto out;
1505         entry.query_len = strlen(entry.query) + 1;
1506         if (!error) {
1507                 tomoyo_add_entry(r->domain, entry.query);
1508                 goto out;
1509         }
1510         len = tomoyo_round2(entry.query_len);
1511         spin_lock(&tomoyo_query_list_lock);
1512         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
1513             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
1514             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
1515                 quota_exceeded = true;
1516         } else {
1517                 entry.serial = tomoyo_serial++;
1518                 entry.retry = r->retry;
1519                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
1520                 list_add_tail(&entry.list, &tomoyo_query_list);
1521         }
1522         spin_unlock(&tomoyo_query_list_lock);
1523         if (quota_exceeded)
1524                 goto out;
1525         /* Give 10 seconds for supervisor's opinion. */
1526         while (entry.timer < 10) {
1527                 wake_up_all(&tomoyo_query_wait);
1528                 if (wait_event_interruptible_timeout
1529                     (tomoyo_answer_wait, entry.answer ||
1530                      !atomic_read(&tomoyo_query_observers), HZ))
1531                         break;
1532                 else
1533                         entry.timer++;
1534         }
1535         spin_lock(&tomoyo_query_list_lock);
1536         list_del(&entry.list);
1537         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
1538         spin_unlock(&tomoyo_query_list_lock);
1539         switch (entry.answer) {
1540         case 3: /* Asked to retry by administrator. */
1541                 error = TOMOYO_RETRY_REQUEST;
1542                 r->retry++;
1543                 break;
1544         case 1:
1545                 /* Granted by administrator. */
1546                 error = 0;
1547                 break;
1548         default:
1549                 /* Timed out or rejected by administrator. */
1550                 break;
1551         }
1552 out:
1553         kfree(entry.query);
1554         return error;
1555 }
1556
1557 /**
1558  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1559  *
1560  * @file: Pointer to "struct file".
1561  * @wait: Pointer to "poll_table".
1562  *
1563  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1564  *
1565  * Waits for access requests which violated policy in enforcing mode.
1566  */
1567 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1568 {
1569         struct list_head *tmp;
1570         bool found = false;
1571         u8 i;
1572         for (i = 0; i < 2; i++) {
1573                 spin_lock(&tomoyo_query_list_lock);
1574                 list_for_each(tmp, &tomoyo_query_list) {
1575                         struct tomoyo_query *ptr =
1576                                 list_entry(tmp, typeof(*ptr), list);
1577                         if (ptr->answer)
1578                                 continue;
1579                         found = true;
1580                         break;
1581                 }
1582                 spin_unlock(&tomoyo_query_list_lock);
1583                 if (found)
1584                         return POLLIN | POLLRDNORM;
1585                 if (i)
1586                         break;
1587                 poll_wait(file, &tomoyo_query_wait, wait);
1588         }
1589         return 0;
1590 }
1591
1592 /**
1593  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1594  *
1595  * @head: Pointer to "struct tomoyo_io_buffer".
1596  */
1597 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1598 {
1599         struct list_head *tmp;
1600         int pos = 0;
1601         int len = 0;
1602         char *buf;
1603         if (head->r.w_pos)
1604                 return;
1605         if (head->read_buf) {
1606                 kfree(head->read_buf);
1607                 head->read_buf = NULL;
1608         }
1609         spin_lock(&tomoyo_query_list_lock);
1610         list_for_each(tmp, &tomoyo_query_list) {
1611                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1612                 if (ptr->answer)
1613                         continue;
1614                 if (pos++ != head->r.query_index)
1615                         continue;
1616                 len = ptr->query_len;
1617                 break;
1618         }
1619         spin_unlock(&tomoyo_query_list_lock);
1620         if (!len) {
1621                 head->r.query_index = 0;
1622                 return;
1623         }
1624         buf = kzalloc(len + 32, GFP_NOFS);
1625         if (!buf)
1626                 return;
1627         pos = 0;
1628         spin_lock(&tomoyo_query_list_lock);
1629         list_for_each(tmp, &tomoyo_query_list) {
1630                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1631                 if (ptr->answer)
1632                         continue;
1633                 if (pos++ != head->r.query_index)
1634                         continue;
1635                 /*
1636                  * Some query can be skipped because tomoyo_query_list
1637                  * can change, but I don't care.
1638                  */
1639                 if (len == ptr->query_len)
1640                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
1641                                  ptr->retry, ptr->query);
1642                 break;
1643         }
1644         spin_unlock(&tomoyo_query_list_lock);
1645         if (buf[0]) {
1646                 head->read_buf = buf;
1647                 head->r.w[head->r.w_pos++] = buf;
1648                 head->r.query_index++;
1649         } else {
1650                 kfree(buf);
1651         }
1652 }
1653
1654 /**
1655  * tomoyo_write_answer - Write the supervisor's decision.
1656  *
1657  * @head: Pointer to "struct tomoyo_io_buffer".
1658  *
1659  * Returns 0 on success, -EINVAL otherwise.
1660  */
1661 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1662 {
1663         char *data = head->write_buf;
1664         struct list_head *tmp;
1665         unsigned int serial;
1666         unsigned int answer;
1667         spin_lock(&tomoyo_query_list_lock);
1668         list_for_each(tmp, &tomoyo_query_list) {
1669                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1670                 ptr->timer = 0;
1671         }
1672         spin_unlock(&tomoyo_query_list_lock);
1673         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1674                 return -EINVAL;
1675         spin_lock(&tomoyo_query_list_lock);
1676         list_for_each(tmp, &tomoyo_query_list) {
1677                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1678                 if (ptr->serial != serial)
1679                         continue;
1680                 if (!ptr->answer)
1681                         ptr->answer = answer;
1682                 break;
1683         }
1684         spin_unlock(&tomoyo_query_list_lock);
1685         return 0;
1686 }
1687
1688 /**
1689  * tomoyo_read_version: Get version.
1690  *
1691  * @head: Pointer to "struct tomoyo_io_buffer".
1692  *
1693  * Returns version information.
1694  */
1695 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1696 {
1697         if (!head->r.eof) {
1698                 tomoyo_io_printf(head, "2.4.0");
1699                 head->r.eof = true;
1700         }
1701 }
1702
1703 /**
1704  * tomoyo_read_self_domain - Get the current process's domainname.
1705  *
1706  * @head: Pointer to "struct tomoyo_io_buffer".
1707  *
1708  * Returns the current process's domainname.
1709  */
1710 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1711 {
1712         if (!head->r.eof) {
1713                 /*
1714                  * tomoyo_domain()->domainname != NULL
1715                  * because every process belongs to a domain and
1716                  * the domain's name cannot be NULL.
1717                  */
1718                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1719                 head->r.eof = true;
1720         }
1721 }
1722
1723 /**
1724  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1725  *
1726  * @type: Type of interface.
1727  * @file: Pointer to "struct file".
1728  *
1729  * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1730  *
1731  * Caller acquires tomoyo_read_lock().
1732  */
1733 int tomoyo_open_control(const u8 type, struct file *file)
1734 {
1735         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1736
1737         if (!head)
1738                 return -ENOMEM;
1739         mutex_init(&head->io_sem);
1740         head->type = type;
1741         switch (type) {
1742         case TOMOYO_DOMAINPOLICY:
1743                 /* /sys/kernel/security/tomoyo/domain_policy */
1744                 head->write = tomoyo_write_domain;
1745                 head->read = tomoyo_read_domain;
1746                 break;
1747         case TOMOYO_EXCEPTIONPOLICY:
1748                 /* /sys/kernel/security/tomoyo/exception_policy */
1749                 head->write = tomoyo_write_exception;
1750                 head->read = tomoyo_read_exception;
1751                 break;
1752         case TOMOYO_AUDIT:
1753                 /* /sys/kernel/security/tomoyo/audit */
1754                 head->poll = tomoyo_poll_log;
1755                 head->read = tomoyo_read_log;
1756                 break;
1757         case TOMOYO_SELFDOMAIN:
1758                 /* /sys/kernel/security/tomoyo/self_domain */
1759                 head->read = tomoyo_read_self_domain;
1760                 break;
1761         case TOMOYO_DOMAIN_STATUS:
1762                 /* /sys/kernel/security/tomoyo/.domain_status */
1763                 head->write = tomoyo_write_domain_profile;
1764                 head->read = tomoyo_read_domain_profile;
1765                 break;
1766         case TOMOYO_PROCESS_STATUS:
1767                 /* /sys/kernel/security/tomoyo/.process_status */
1768                 head->write = tomoyo_write_pid;
1769                 head->read = tomoyo_read_pid;
1770                 break;
1771         case TOMOYO_VERSION:
1772                 /* /sys/kernel/security/tomoyo/version */
1773                 head->read = tomoyo_read_version;
1774                 head->readbuf_size = 128;
1775                 break;
1776         case TOMOYO_MEMINFO:
1777                 /* /sys/kernel/security/tomoyo/meminfo */
1778                 head->write = tomoyo_write_memory_quota;
1779                 head->read = tomoyo_read_memory_counter;
1780                 head->readbuf_size = 512;
1781                 break;
1782         case TOMOYO_PROFILE:
1783                 /* /sys/kernel/security/tomoyo/profile */
1784                 head->write = tomoyo_write_profile;
1785                 head->read = tomoyo_read_profile;
1786                 break;
1787         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1788                 head->poll = tomoyo_poll_query;
1789                 head->write = tomoyo_write_answer;
1790                 head->read = tomoyo_read_query;
1791                 break;
1792         case TOMOYO_MANAGER:
1793                 /* /sys/kernel/security/tomoyo/manager */
1794                 head->write = tomoyo_write_manager;
1795                 head->read = tomoyo_read_manager;
1796                 break;
1797         }
1798         if (!(file->f_mode & FMODE_READ)) {
1799                 /*
1800                  * No need to allocate read_buf since it is not opened
1801                  * for reading.
1802                  */
1803                 head->read = NULL;
1804                 head->poll = NULL;
1805         } else if (!head->poll) {
1806                 /* Don't allocate read_buf for poll() access. */
1807                 if (!head->readbuf_size)
1808                         head->readbuf_size = 4096 * 2;
1809                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1810                 if (!head->read_buf) {
1811                         kfree(head);
1812                         return -ENOMEM;
1813                 }
1814         }
1815         if (!(file->f_mode & FMODE_WRITE)) {
1816                 /*
1817                  * No need to allocate write_buf since it is not opened
1818                  * for writing.
1819                  */
1820                 head->write = NULL;
1821         } else if (head->write) {
1822                 head->writebuf_size = 4096 * 2;
1823                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1824                 if (!head->write_buf) {
1825                         kfree(head->read_buf);
1826                         kfree(head);
1827                         return -ENOMEM;
1828                 }
1829         }
1830         if (type != TOMOYO_QUERY && type != TOMOYO_AUDIT)
1831                 head->reader_idx = tomoyo_read_lock();
1832         file->private_data = head;
1833         /*
1834          * If the file is /sys/kernel/security/tomoyo/query , increment the
1835          * observer counter.
1836          * The obserber counter is used by tomoyo_supervisor() to see if
1837          * there is some process monitoring /sys/kernel/security/tomoyo/query.
1838          */
1839         if (type == TOMOYO_QUERY)
1840                 atomic_inc(&tomoyo_query_observers);
1841         return 0;
1842 }
1843
1844 /**
1845  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1846  *
1847  * @file: Pointer to "struct file".
1848  * @wait: Pointer to "poll_table".
1849  *
1850  * Waits for read readiness.
1851  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
1852  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
1853  */
1854 int tomoyo_poll_control(struct file *file, poll_table *wait)
1855 {
1856         struct tomoyo_io_buffer *head = file->private_data;
1857         if (!head->poll)
1858                 return -ENOSYS;
1859         return head->poll(file, wait);
1860 }
1861
1862 /**
1863  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1864  *
1865  * @head:       Pointer to "struct tomoyo_io_buffer".
1866  * @buffer:     Poiner to buffer to write to.
1867  * @buffer_len: Size of @buffer.
1868  *
1869  * Returns bytes read on success, negative value otherwise.
1870  *
1871  * Caller holds tomoyo_read_lock().
1872  */
1873 int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
1874                         const int buffer_len)
1875 {
1876         int len;
1877
1878         if (!head->read)
1879                 return -ENOSYS;
1880         if (mutex_lock_interruptible(&head->io_sem))
1881                 return -EINTR;
1882         head->read_user_buf = buffer;
1883         head->read_user_buf_avail = buffer_len;
1884         if (tomoyo_flush(head))
1885                 /* Call the policy handler. */
1886                 head->read(head);
1887         tomoyo_flush(head);
1888         len = head->read_user_buf - buffer;
1889         mutex_unlock(&head->io_sem);
1890         return len;
1891 }
1892
1893 /**
1894  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1895  *
1896  * @head:       Pointer to "struct tomoyo_io_buffer".
1897  * @buffer:     Pointer to buffer to read from.
1898  * @buffer_len: Size of @buffer.
1899  *
1900  * Returns @buffer_len on success, negative value otherwise.
1901  *
1902  * Caller holds tomoyo_read_lock().
1903  */
1904 int tomoyo_write_control(struct tomoyo_io_buffer *head,
1905                          const char __user *buffer, const int buffer_len)
1906 {
1907         int error = buffer_len;
1908         int avail_len = buffer_len;
1909         char *cp0 = head->write_buf;
1910
1911         if (!head->write)
1912                 return -ENOSYS;
1913         if (!access_ok(VERIFY_READ, buffer, buffer_len))
1914                 return -EFAULT;
1915         /* Don't allow updating policies by non manager programs. */
1916         if (head->write != tomoyo_write_pid &&
1917             head->write != tomoyo_write_domain && !tomoyo_manager())
1918                 return -EPERM;
1919         if (mutex_lock_interruptible(&head->io_sem))
1920                 return -EINTR;
1921         /* Read a line and dispatch it to the policy handler. */
1922         while (avail_len > 0) {
1923                 char c;
1924                 if (head->w.avail >= head->writebuf_size - 1) {
1925                         error = -ENOMEM;
1926                         break;
1927                 } else if (get_user(c, buffer)) {
1928                         error = -EFAULT;
1929                         break;
1930                 }
1931                 buffer++;
1932                 avail_len--;
1933                 cp0[head->w.avail++] = c;
1934                 if (c != '\n')
1935                         continue;
1936                 cp0[head->w.avail - 1] = '\0';
1937                 head->w.avail = 0;
1938                 tomoyo_normalize_line(cp0);
1939                 head->write(head);
1940         }
1941         mutex_unlock(&head->io_sem);
1942         return error;
1943 }
1944
1945 /**
1946  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1947  *
1948  * @head: Pointer to "struct tomoyo_io_buffer".
1949  *
1950  * Releases memory and returns 0.
1951  *
1952  * Caller looses tomoyo_read_lock().
1953  */
1954 int tomoyo_close_control(struct tomoyo_io_buffer *head)
1955 {
1956         const bool is_write = !!head->write_buf;
1957
1958         /*
1959          * If the file is /sys/kernel/security/tomoyo/query , decrement the
1960          * observer counter.
1961          */
1962         if (head->type == TOMOYO_QUERY)
1963                 atomic_dec(&tomoyo_query_observers);
1964         else if (head->type != TOMOYO_AUDIT)
1965                 tomoyo_read_unlock(head->reader_idx);
1966         /* Release memory used for policy I/O. */
1967         kfree(head->read_buf);
1968         head->read_buf = NULL;
1969         kfree(head->write_buf);
1970         head->write_buf = NULL;
1971         kfree(head);
1972         if (is_write)
1973                 tomoyo_run_gc();
1974         return 0;
1975 }
1976
1977 /**
1978  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
1979  */
1980 void tomoyo_check_profile(void)
1981 {
1982         struct tomoyo_domain_info *domain;
1983         const int idx = tomoyo_read_lock();
1984         tomoyo_policy_loaded = true;
1985         /* Check all profiles currently assigned to domains are defined. */
1986         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1987                 const u8 profile = domain->profile;
1988                 if (tomoyo_profile_ptr[profile])
1989                         continue;
1990                 printk(KERN_ERR "You need to define profile %u before using it.\n",
1991                        profile);
1992                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
1993                        "for more information.\n");
1994                 panic("Profile %u (used by '%s') not defined.\n",
1995                       profile, domain->domainname->name);
1996         }
1997         tomoyo_read_unlock(idx);
1998         if (tomoyo_profile_version != 20090903) {
1999                 printk(KERN_ERR "You need to install userland programs for "
2000                        "TOMOYO 2.3 and initialize policy configuration.\n");
2001                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2002                        "for more information.\n");
2003                 panic("Profile version %u is not supported.\n",
2004                       tomoyo_profile_version);
2005         }
2006         printk(KERN_INFO "TOMOYO: 2.3.0\n");
2007         printk(KERN_INFO "Mandatory Access Control activated.\n");
2008 }