common.c revision f23571e866309a2048030ef6a5f0725cf139d4c9
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 14static 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. */ 25static unsigned int tomoyo_profile_version; 26 27/* Profile table. Memory is allocated as needed. */ 28static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES]; 29 30/* String table for functionality that takes 4 modes. */ 31static const char *tomoyo_mode[4] = { 32 "disabled", "learning", "permissive", "enforcing" 33}; 34 35/* String table for /sys/kernel/security/tomoyo/profile */ 36static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX 37 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = { 38 [TOMOYO_MAC_FILE_EXECUTE] = "file::execute", 39 [TOMOYO_MAC_FILE_OPEN] = "file::open", 40 [TOMOYO_MAC_FILE_CREATE] = "file::create", 41 [TOMOYO_MAC_FILE_UNLINK] = "file::unlink", 42 [TOMOYO_MAC_FILE_MKDIR] = "file::mkdir", 43 [TOMOYO_MAC_FILE_RMDIR] = "file::rmdir", 44 [TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo", 45 [TOMOYO_MAC_FILE_MKSOCK] = "file::mksock", 46 [TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate", 47 [TOMOYO_MAC_FILE_SYMLINK] = "file::symlink", 48 [TOMOYO_MAC_FILE_REWRITE] = "file::rewrite", 49 [TOMOYO_MAC_FILE_MKBLOCK] = "file::mkblock", 50 [TOMOYO_MAC_FILE_MKCHAR] = "file::mkchar", 51 [TOMOYO_MAC_FILE_LINK] = "file::link", 52 [TOMOYO_MAC_FILE_RENAME] = "file::rename", 53 [TOMOYO_MAC_FILE_CHMOD] = "file::chmod", 54 [TOMOYO_MAC_FILE_CHOWN] = "file::chown", 55 [TOMOYO_MAC_FILE_CHGRP] = "file::chgrp", 56 [TOMOYO_MAC_FILE_IOCTL] = "file::ioctl", 57 [TOMOYO_MAC_FILE_CHROOT] = "file::chroot", 58 [TOMOYO_MAC_FILE_MOUNT] = "file::mount", 59 [TOMOYO_MAC_FILE_UMOUNT] = "file::umount", 60 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root", 61 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file", 62}; 63 64/* Permit policy management by non-root user? */ 65static 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 */ 74static const char *tomoyo_yesno(const unsigned int value) 75{ 76 return value ? "yes" : "no"; 77} 78 79static 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 */ 95static bool tomoyo_flush(struct tomoyo_io_buffer *head) 96{ 97 while (head->r.w_pos) { 98 const char *w = head->r.w[0]; 99 int len = strlen(w); 100 if (len) { 101 if (len > head->read_user_buf_avail) 102 len = head->read_user_buf_avail; 103 if (!len) 104 return false; 105 if (copy_to_user(head->read_user_buf, w, len)) 106 return false; 107 head->read_user_buf_avail -= len; 108 head->read_user_buf += len; 109 w += len; 110 } 111 if (*w) { 112 head->r.w[0] = w; 113 return false; 114 } 115 /* Add '\0' for query. */ 116 if (head->poll) { 117 if (!head->read_user_buf_avail || 118 copy_to_user(head->read_user_buf, "", 1)) 119 return false; 120 head->read_user_buf_avail--; 121 head->read_user_buf++; 122 } 123 head->r.w_pos--; 124 for (len = 0; len < head->r.w_pos; len++) 125 head->r.w[len] = head->r.w[len + 1]; 126 } 127 head->r.avail = 0; 128 return true; 129} 130 131/** 132 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure. 133 * 134 * @head: Pointer to "struct tomoyo_io_buffer". 135 * @string: String to print. 136 * 137 * Note that @string has to be kept valid until @head is kfree()d. 138 * This means that char[] allocated on stack memory cannot be passed to 139 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory. 140 */ 141static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string) 142{ 143 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) { 144 head->r.w[head->r.w_pos++] = string; 145 tomoyo_flush(head); 146 } else 147 WARN_ON(1); 148} 149 150/** 151 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure. 152 * 153 * @head: Pointer to "struct tomoyo_io_buffer". 154 * @fmt: The printf()'s format string, followed by parameters. 155 */ 156void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) 157{ 158 va_list args; 159 int len; 160 int pos = head->r.avail; 161 int size = head->readbuf_size - pos; 162 if (size <= 0) 163 return; 164 va_start(args, fmt); 165 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1; 166 va_end(args); 167 if (pos + len >= head->readbuf_size) { 168 WARN_ON(1); 169 return; 170 } 171 head->r.avail += len; 172 tomoyo_set_string(head, head->read_buf + pos); 173} 174 175static void tomoyo_set_space(struct tomoyo_io_buffer *head) 176{ 177 tomoyo_set_string(head, " "); 178} 179 180static bool tomoyo_set_lf(struct tomoyo_io_buffer *head) 181{ 182 tomoyo_set_string(head, "\n"); 183 return !head->r.w_pos; 184} 185 186/** 187 * tomoyo_print_name_union - Print a tomoyo_name_union. 188 * 189 * @head: Pointer to "struct tomoyo_io_buffer". 190 * @ptr: Pointer to "struct tomoyo_name_union". 191 */ 192static void tomoyo_print_name_union(struct tomoyo_io_buffer *head, 193 const struct tomoyo_name_union *ptr) 194{ 195 tomoyo_set_space(head); 196 if (ptr->is_group) { 197 tomoyo_set_string(head, "@"); 198 tomoyo_set_string(head, ptr->group->group_name->name); 199 } else { 200 tomoyo_set_string(head, ptr->filename->name); 201 } 202} 203 204/** 205 * tomoyo_print_number_union - Print a tomoyo_number_union. 206 * 207 * @head: Pointer to "struct tomoyo_io_buffer". 208 * @ptr: Pointer to "struct tomoyo_number_union". 209 */ 210static void tomoyo_print_number_union(struct tomoyo_io_buffer *head, 211 const struct tomoyo_number_union *ptr) 212{ 213 tomoyo_set_space(head); 214 if (ptr->is_group) { 215 tomoyo_set_string(head, "@"); 216 tomoyo_set_string(head, ptr->group->group_name->name); 217 } else { 218 int i; 219 unsigned long min = ptr->values[0]; 220 const unsigned long max = ptr->values[1]; 221 u8 min_type = ptr->min_type; 222 const u8 max_type = ptr->max_type; 223 char buffer[128]; 224 buffer[0] = '\0'; 225 for (i = 0; i < 2; i++) { 226 switch (min_type) { 227 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 228 tomoyo_addprintf(buffer, sizeof(buffer), 229 "0x%lX", min); 230 break; 231 case TOMOYO_VALUE_TYPE_OCTAL: 232 tomoyo_addprintf(buffer, sizeof(buffer), 233 "0%lo", min); 234 break; 235 default: 236 tomoyo_addprintf(buffer, sizeof(buffer), 237 "%lu", min); 238 break; 239 } 240 if (min == max && min_type == max_type) 241 break; 242 tomoyo_addprintf(buffer, sizeof(buffer), "-"); 243 min_type = max_type; 244 min = max; 245 } 246 tomoyo_io_printf(head, "%s", buffer); 247 } 248} 249 250/** 251 * tomoyo_find_or_assign_new_profile - Create a new profile. 252 * 253 * @profile: Profile number to create. 254 * 255 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. 256 */ 257static struct tomoyo_profile *tomoyo_find_or_assign_new_profile 258(const unsigned int profile) 259{ 260 struct tomoyo_profile *ptr; 261 struct tomoyo_profile *entry; 262 if (profile >= TOMOYO_MAX_PROFILES) 263 return NULL; 264 ptr = tomoyo_profile_ptr[profile]; 265 if (ptr) 266 return ptr; 267 entry = kzalloc(sizeof(*entry), GFP_NOFS); 268 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 269 goto out; 270 ptr = tomoyo_profile_ptr[profile]; 271 if (!ptr && tomoyo_memory_ok(entry)) { 272 ptr = entry; 273 ptr->learning = &tomoyo_default_profile.preference; 274 ptr->permissive = &tomoyo_default_profile.preference; 275 ptr->enforcing = &tomoyo_default_profile.preference; 276 ptr->default_config = TOMOYO_CONFIG_DISABLED; 277 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT, 278 sizeof(ptr->config)); 279 mb(); /* Avoid out-of-order execution. */ 280 tomoyo_profile_ptr[profile] = ptr; 281 entry = NULL; 282 } 283 mutex_unlock(&tomoyo_policy_lock); 284 out: 285 kfree(entry); 286 return ptr; 287} 288 289/** 290 * tomoyo_profile - Find a profile. 291 * 292 * @profile: Profile number to find. 293 * 294 * Returns pointer to "struct tomoyo_profile". 295 */ 296struct tomoyo_profile *tomoyo_profile(const u8 profile) 297{ 298 struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile]; 299 if (!tomoyo_policy_loaded) 300 return &tomoyo_default_profile; 301 BUG_ON(!ptr); 302 return ptr; 303} 304 305/** 306 * tomoyo_write_profile - Write profile table. 307 * 308 * @head: Pointer to "struct tomoyo_io_buffer". 309 * 310 * Returns 0 on success, negative value otherwise. 311 */ 312static int tomoyo_write_profile(struct tomoyo_io_buffer *head) 313{ 314 char *data = head->write_buf; 315 unsigned int i; 316 int value; 317 int mode; 318 u8 config; 319 bool use_default = false; 320 char *cp; 321 struct tomoyo_profile *profile; 322 if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1) 323 return 0; 324 i = simple_strtoul(data, &cp, 10); 325 if (data == cp) { 326 profile = &tomoyo_default_profile; 327 } else { 328 if (*cp != '-') 329 return -EINVAL; 330 data = cp + 1; 331 profile = tomoyo_find_or_assign_new_profile(i); 332 if (!profile) 333 return -EINVAL; 334 } 335 cp = strchr(data, '='); 336 if (!cp) 337 return -EINVAL; 338 *cp++ = '\0'; 339 if (profile != &tomoyo_default_profile) 340 use_default = strstr(cp, "use_default") != NULL; 341 if (strstr(cp, "verbose=yes")) 342 value = 1; 343 else if (strstr(cp, "verbose=no")) 344 value = 0; 345 else 346 value = -1; 347 if (!strcmp(data, "PREFERENCE::enforcing")) { 348 if (use_default) { 349 profile->enforcing = &tomoyo_default_profile.preference; 350 return 0; 351 } 352 profile->enforcing = &profile->preference; 353 if (value >= 0) 354 profile->preference.enforcing_verbose = value; 355 return 0; 356 } 357 if (!strcmp(data, "PREFERENCE::permissive")) { 358 if (use_default) { 359 profile->permissive = &tomoyo_default_profile.preference; 360 return 0; 361 } 362 profile->permissive = &profile->preference; 363 if (value >= 0) 364 profile->preference.permissive_verbose = value; 365 return 0; 366 } 367 if (!strcmp(data, "PREFERENCE::learning")) { 368 char *cp2; 369 if (use_default) { 370 profile->learning = &tomoyo_default_profile.preference; 371 return 0; 372 } 373 profile->learning = &profile->preference; 374 if (value >= 0) 375 profile->preference.learning_verbose = value; 376 cp2 = strstr(cp, "max_entry="); 377 if (cp2) 378 sscanf(cp2 + 10, "%u", 379 &profile->preference.learning_max_entry); 380 return 0; 381 } 382 if (profile == &tomoyo_default_profile) 383 return -EINVAL; 384 if (!strcmp(data, "COMMENT")) { 385 const struct tomoyo_path_info *old_comment = profile->comment; 386 profile->comment = tomoyo_get_name(cp); 387 tomoyo_put_name(old_comment); 388 return 0; 389 } 390 if (!strcmp(data, "CONFIG")) { 391 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; 392 config = profile->default_config; 393 } else if (tomoyo_str_starts(&data, "CONFIG::")) { 394 config = 0; 395 for (i = 0; i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { 396 if (strcmp(data, tomoyo_mac_keywords[i])) 397 continue; 398 config = profile->config[i]; 399 break; 400 } 401 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 402 return -EINVAL; 403 } else { 404 return -EINVAL; 405 } 406 if (use_default) { 407 config = TOMOYO_CONFIG_USE_DEFAULT; 408 } else { 409 for (mode = 3; mode >= 0; mode--) 410 if (strstr(cp, tomoyo_mode[mode])) 411 /* 412 * Update lower 3 bits in order to distinguish 413 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'. 414 */ 415 config = (config & ~7) | mode; 416 } 417 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 418 profile->config[i] = config; 419 else if (config != TOMOYO_CONFIG_USE_DEFAULT) 420 profile->default_config = config; 421 return 0; 422} 423 424static void tomoyo_print_preference(struct tomoyo_io_buffer *head, 425 const int idx) 426{ 427 struct tomoyo_preference *pref = &tomoyo_default_profile.preference; 428 const struct tomoyo_profile *profile = idx >= 0 ? 429 tomoyo_profile_ptr[idx] : NULL; 430 char buffer[16] = ""; 431 if (profile) { 432 buffer[sizeof(buffer) - 1] = '\0'; 433 snprintf(buffer, sizeof(buffer) - 1, "%u-", idx); 434 } 435 if (profile) { 436 pref = profile->learning; 437 if (pref == &tomoyo_default_profile.preference) 438 goto skip1; 439 } 440 tomoyo_io_printf(head, "%sPREFERENCE::%s={ " 441 "verbose=%s max_entry=%u }\n", 442 buffer, "learning", 443 tomoyo_yesno(pref->learning_verbose), 444 pref->learning_max_entry); 445 skip1: 446 if (profile) { 447 pref = profile->permissive; 448 if (pref == &tomoyo_default_profile.preference) 449 goto skip2; 450 } 451 tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n", 452 buffer, "permissive", 453 tomoyo_yesno(pref->permissive_verbose)); 454 skip2: 455 if (profile) { 456 pref = profile->enforcing; 457 if (pref == &tomoyo_default_profile.preference) 458 return; 459 } 460 tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n", 461 buffer, "enforcing", 462 tomoyo_yesno(pref->enforcing_verbose)); 463} 464 465static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config) 466{ 467 tomoyo_io_printf(head, "={ mode=%s }\n", tomoyo_mode[config & 3]); 468} 469 470/** 471 * tomoyo_read_profile - Read profile table. 472 * 473 * @head: Pointer to "struct tomoyo_io_buffer". 474 */ 475static void tomoyo_read_profile(struct tomoyo_io_buffer *head) 476{ 477 u8 index; 478 const struct tomoyo_profile *profile; 479 next: 480 index = head->r.index; 481 profile = tomoyo_profile_ptr[index]; 482 switch (head->r.step) { 483 case 0: 484 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903"); 485 tomoyo_print_preference(head, -1); 486 head->r.step++; 487 break; 488 case 1: 489 for ( ; head->r.index < TOMOYO_MAX_PROFILES; 490 head->r.index++) 491 if (tomoyo_profile_ptr[head->r.index]) 492 break; 493 if (head->r.index == TOMOYO_MAX_PROFILES) 494 return; 495 head->r.step++; 496 break; 497 case 2: 498 { 499 const struct tomoyo_path_info *comment = 500 profile->comment; 501 tomoyo_io_printf(head, "%u-COMMENT=", index); 502 tomoyo_set_string(head, comment ? comment->name : ""); 503 tomoyo_set_lf(head); 504 head->r.step++; 505 } 506 break; 507 case 3: 508 { 509 tomoyo_io_printf(head, "%u-%s", index, "CONFIG"); 510 tomoyo_print_config(head, profile->default_config); 511 head->r.bit = 0; 512 head->r.step++; 513 } 514 break; 515 case 4: 516 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX 517 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { 518 const u8 i = head->r.bit; 519 const u8 config = profile->config[i]; 520 if (config == TOMOYO_CONFIG_USE_DEFAULT) 521 continue; 522 tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::", 523 tomoyo_mac_keywords[i]); 524 tomoyo_print_config(head, config); 525 head->r.bit++; 526 break; 527 } 528 if (head->r.bit == TOMOYO_MAX_MAC_INDEX 529 + TOMOYO_MAX_MAC_CATEGORY_INDEX) { 530 tomoyo_print_preference(head, index); 531 head->r.index++; 532 head->r.step = 1; 533 } 534 break; 535 } 536 if (tomoyo_flush(head)) 537 goto next; 538} 539 540static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a, 541 const struct tomoyo_acl_head *b) 542{ 543 return container_of(a, struct tomoyo_policy_manager_entry, head) 544 ->manager == 545 container_of(b, struct tomoyo_policy_manager_entry, head) 546 ->manager; 547} 548 549/** 550 * tomoyo_update_manager_entry - Add a manager entry. 551 * 552 * @manager: The path to manager or the domainnamme. 553 * @is_delete: True if it is a delete request. 554 * 555 * Returns 0 on success, negative value otherwise. 556 * 557 * Caller holds tomoyo_read_lock(). 558 */ 559static int tomoyo_update_manager_entry(const char *manager, 560 const bool is_delete) 561{ 562 struct tomoyo_policy_manager_entry e = { }; 563 int error; 564 565 if (tomoyo_domain_def(manager)) { 566 if (!tomoyo_correct_domain(manager)) 567 return -EINVAL; 568 e.is_domain = true; 569 } else { 570 if (!tomoyo_correct_path(manager)) 571 return -EINVAL; 572 } 573 e.manager = tomoyo_get_name(manager); 574 if (!e.manager) 575 return -ENOMEM; 576 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, 577 &tomoyo_policy_list[TOMOYO_ID_MANAGER], 578 tomoyo_same_manager_entry); 579 tomoyo_put_name(e.manager); 580 return error; 581} 582 583/** 584 * tomoyo_write_manager_policy - Write manager policy. 585 * 586 * @head: Pointer to "struct tomoyo_io_buffer". 587 * 588 * Returns 0 on success, negative value otherwise. 589 * 590 * Caller holds tomoyo_read_lock(). 591 */ 592static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) 593{ 594 char *data = head->write_buf; 595 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 596 597 if (!strcmp(data, "manage_by_non_root")) { 598 tomoyo_manage_by_non_root = !is_delete; 599 return 0; 600 } 601 return tomoyo_update_manager_entry(data, is_delete); 602} 603 604/** 605 * tomoyo_read_manager_policy - Read manager policy. 606 * 607 * @head: Pointer to "struct tomoyo_io_buffer". 608 * 609 * Caller holds tomoyo_read_lock(). 610 */ 611static void tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) 612{ 613 if (head->r.eof) 614 return; 615 list_for_each_cookie(head->r.acl, 616 &tomoyo_policy_list[TOMOYO_ID_MANAGER]) { 617 struct tomoyo_policy_manager_entry *ptr = 618 list_entry(head->r.acl, typeof(*ptr), head.list); 619 if (ptr->head.is_deleted) 620 continue; 621 if (!tomoyo_flush(head)) 622 return; 623 tomoyo_set_string(head, ptr->manager->name); 624 tomoyo_set_lf(head); 625 } 626 head->r.eof = true; 627} 628 629/** 630 * tomoyo_policy_manager - Check whether the current process is a policy manager. 631 * 632 * Returns true if the current process is permitted to modify policy 633 * via /sys/kernel/security/tomoyo/ interface. 634 * 635 * Caller holds tomoyo_read_lock(). 636 */ 637static bool tomoyo_policy_manager(void) 638{ 639 struct tomoyo_policy_manager_entry *ptr; 640 const char *exe; 641 const struct task_struct *task = current; 642 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; 643 bool found = false; 644 645 if (!tomoyo_policy_loaded) 646 return true; 647 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) 648 return false; 649 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER], 650 head.list) { 651 if (!ptr->head.is_deleted && ptr->is_domain 652 && !tomoyo_pathcmp(domainname, ptr->manager)) { 653 found = true; 654 break; 655 } 656 } 657 if (found) 658 return true; 659 exe = tomoyo_get_exe(); 660 if (!exe) 661 return false; 662 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER], 663 head.list) { 664 if (!ptr->head.is_deleted && !ptr->is_domain 665 && !strcmp(exe, ptr->manager->name)) { 666 found = true; 667 break; 668 } 669 } 670 if (!found) { /* Reduce error messages. */ 671 static pid_t last_pid; 672 const pid_t pid = current->pid; 673 if (last_pid != pid) { 674 printk(KERN_WARNING "%s ( %s ) is not permitted to " 675 "update policies.\n", domainname->name, exe); 676 last_pid = pid; 677 } 678 } 679 kfree(exe); 680 return found; 681} 682 683/** 684 * tomoyo_select_one - Parse select command. 685 * 686 * @head: Pointer to "struct tomoyo_io_buffer". 687 * @data: String to parse. 688 * 689 * Returns true on success, false otherwise. 690 * 691 * Caller holds tomoyo_read_lock(). 692 */ 693static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data) 694{ 695 unsigned int pid; 696 struct tomoyo_domain_info *domain = NULL; 697 bool global_pid = false; 698 699 if (!strcmp(data, "allow_execute")) { 700 head->r.print_execute_only = true; 701 return true; 702 } 703 if (sscanf(data, "pid=%u", &pid) == 1 || 704 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 705 struct task_struct *p; 706 rcu_read_lock(); 707 read_lock(&tasklist_lock); 708 if (global_pid) 709 p = find_task_by_pid_ns(pid, &init_pid_ns); 710 else 711 p = find_task_by_vpid(pid); 712 if (p) 713 domain = tomoyo_real_domain(p); 714 read_unlock(&tasklist_lock); 715 rcu_read_unlock(); 716 } else if (!strncmp(data, "domain=", 7)) { 717 if (tomoyo_domain_def(data + 7)) 718 domain = tomoyo_find_domain(data + 7); 719 } else 720 return false; 721 head->write_var1 = domain; 722 /* Accessing read_buf is safe because head->io_sem is held. */ 723 if (!head->read_buf) 724 return true; /* Do nothing if open(O_WRONLY). */ 725 memset(&head->r, 0, sizeof(head->r)); 726 head->r.print_this_domain_only = true; 727 head->r.eof = !domain; 728 head->r.domain = &domain->list; 729 tomoyo_io_printf(head, "# select %s\n", data); 730 if (domain && domain->is_deleted) 731 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 732 return true; 733} 734 735/** 736 * tomoyo_delete_domain - Delete a domain. 737 * 738 * @domainname: The name of domain. 739 * 740 * Returns 0. 741 * 742 * Caller holds tomoyo_read_lock(). 743 */ 744static int tomoyo_delete_domain(char *domainname) 745{ 746 struct tomoyo_domain_info *domain; 747 struct tomoyo_path_info name; 748 749 name.name = domainname; 750 tomoyo_fill_path_info(&name); 751 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 752 return 0; 753 /* Is there an active domain? */ 754 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 755 /* Never delete tomoyo_kernel_domain */ 756 if (domain == &tomoyo_kernel_domain) 757 continue; 758 if (domain->is_deleted || 759 tomoyo_pathcmp(domain->domainname, &name)) 760 continue; 761 domain->is_deleted = true; 762 break; 763 } 764 mutex_unlock(&tomoyo_policy_lock); 765 return 0; 766} 767 768/** 769 * tomoyo_write_domain_policy2 - Write domain policy. 770 * 771 * @head: Pointer to "struct tomoyo_io_buffer". 772 * 773 * Returns 0 on success, negative value otherwise. 774 * 775 * Caller holds tomoyo_read_lock(). 776 */ 777static int tomoyo_write_domain_policy2(char *data, 778 struct tomoyo_domain_info *domain, 779 const bool is_delete) 780{ 781 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) 782 return tomoyo_write_mount_policy(data, domain, is_delete); 783 return tomoyo_write_file_policy(data, domain, is_delete); 784} 785 786/** 787 * tomoyo_write_domain_policy - Write domain policy. 788 * 789 * @head: Pointer to "struct tomoyo_io_buffer". 790 * 791 * Returns 0 on success, negative value otherwise. 792 * 793 * Caller holds tomoyo_read_lock(). 794 */ 795static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) 796{ 797 char *data = head->write_buf; 798 struct tomoyo_domain_info *domain = head->write_var1; 799 bool is_delete = false; 800 bool is_select = false; 801 unsigned int profile; 802 803 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) 804 is_delete = true; 805 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) 806 is_select = true; 807 if (is_select && tomoyo_select_one(head, data)) 808 return 0; 809 /* Don't allow updating policies by non manager programs. */ 810 if (!tomoyo_policy_manager()) 811 return -EPERM; 812 if (tomoyo_domain_def(data)) { 813 domain = NULL; 814 if (is_delete) 815 tomoyo_delete_domain(data); 816 else if (is_select) 817 domain = tomoyo_find_domain(data); 818 else 819 domain = tomoyo_find_or_assign_new_domain(data, 0); 820 head->write_var1 = domain; 821 return 0; 822 } 823 if (!domain) 824 return -EINVAL; 825 826 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 827 && profile < TOMOYO_MAX_PROFILES) { 828 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) 829 domain->profile = (u8) profile; 830 return 0; 831 } 832 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { 833 domain->ignore_global_allow_read = !is_delete; 834 return 0; 835 } 836 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { 837 domain->quota_warned = !is_delete; 838 return 0; 839 } 840 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { 841 domain->transition_failed = !is_delete; 842 return 0; 843 } 844 return tomoyo_write_domain_policy2(data, domain, is_delete); 845} 846 847/** 848 * tomoyo_fns - Find next set bit. 849 * 850 * @perm: 8 bits value. 851 * @bit: First bit to find. 852 * 853 * Returns next on-bit on success, 8 otherwise. 854 */ 855static u8 tomoyo_fns(const u8 perm, u8 bit) 856{ 857 for ( ; bit < 8; bit++) 858 if (perm & (1 << bit)) 859 break; 860 return bit; 861} 862 863/** 864 * tomoyo_print_entry - Print an ACL entry. 865 * 866 * @head: Pointer to "struct tomoyo_io_buffer". 867 * @acl: Pointer to an ACL entry. 868 * 869 * Returns true on success, false otherwise. 870 */ 871static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 872 struct tomoyo_acl_info *acl) 873{ 874 const u8 acl_type = acl->type; 875 u8 bit; 876 877 if (acl->is_deleted) 878 return true; 879 next: 880 bit = head->r.bit; 881 if (!tomoyo_flush(head)) 882 return false; 883 else if (acl_type == TOMOYO_TYPE_PATH_ACL) { 884 struct tomoyo_path_acl *ptr = 885 container_of(acl, typeof(*ptr), head); 886 const u16 perm = ptr->perm; 887 for ( ; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 888 if (!(perm & (1 << bit))) 889 continue; 890 if (head->r.print_execute_only && 891 bit != TOMOYO_TYPE_EXECUTE) 892 continue; 893 /* Print "read/write" instead of "read" and "write". */ 894 if ((bit == TOMOYO_TYPE_READ || 895 bit == TOMOYO_TYPE_WRITE) 896 && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) 897 continue; 898 break; 899 } 900 if (bit >= TOMOYO_MAX_PATH_OPERATION) 901 goto done; 902 tomoyo_io_printf(head, "allow_%s", tomoyo_path_keyword[bit]); 903 tomoyo_print_name_union(head, &ptr->name); 904 } else if (head->r.print_execute_only) { 905 return true; 906 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 907 struct tomoyo_path2_acl *ptr = 908 container_of(acl, typeof(*ptr), head); 909 bit = tomoyo_fns(ptr->perm, bit); 910 if (bit >= TOMOYO_MAX_PATH2_OPERATION) 911 goto done; 912 tomoyo_io_printf(head, "allow_%s", tomoyo_path2_keyword[bit]); 913 tomoyo_print_name_union(head, &ptr->name1); 914 tomoyo_print_name_union(head, &ptr->name2); 915 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 916 struct tomoyo_path_number_acl *ptr = 917 container_of(acl, typeof(*ptr), head); 918 bit = tomoyo_fns(ptr->perm, bit); 919 if (bit >= TOMOYO_MAX_PATH_NUMBER_OPERATION) 920 goto done; 921 tomoyo_io_printf(head, "allow_%s", 922 tomoyo_path_number_keyword[bit]); 923 tomoyo_print_name_union(head, &ptr->name); 924 tomoyo_print_number_union(head, &ptr->number); 925 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 926 struct tomoyo_mkdev_acl *ptr = 927 container_of(acl, typeof(*ptr), head); 928 bit = tomoyo_fns(ptr->perm, bit); 929 if (bit >= TOMOYO_MAX_MKDEV_OPERATION) 930 goto done; 931 tomoyo_io_printf(head, "allow_%s", tomoyo_mkdev_keyword[bit]); 932 tomoyo_print_name_union(head, &ptr->name); 933 tomoyo_print_number_union(head, &ptr->mode); 934 tomoyo_print_number_union(head, &ptr->major); 935 tomoyo_print_number_union(head, &ptr->minor); 936 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 937 struct tomoyo_mount_acl *ptr = 938 container_of(acl, typeof(*ptr), head); 939 tomoyo_io_printf(head, "allow_mount"); 940 tomoyo_print_name_union(head, &ptr->dev_name); 941 tomoyo_print_name_union(head, &ptr->dir_name); 942 tomoyo_print_name_union(head, &ptr->fs_type); 943 tomoyo_print_number_union(head, &ptr->flags); 944 } 945 head->r.bit = bit + 1; 946 tomoyo_io_printf(head, "\n"); 947 if (acl_type != TOMOYO_TYPE_MOUNT_ACL) 948 goto next; 949 done: 950 head->r.bit = 0; 951 return true; 952} 953 954/** 955 * tomoyo_read_domain2 - Read domain policy. 956 * 957 * @head: Pointer to "struct tomoyo_io_buffer". 958 * @domain: Pointer to "struct tomoyo_domain_info". 959 * 960 * Caller holds tomoyo_read_lock(). 961 * 962 * Returns true on success, false otherwise. 963 */ 964static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, 965 struct tomoyo_domain_info *domain) 966{ 967 list_for_each_cookie(head->r.acl, &domain->acl_info_list) { 968 struct tomoyo_acl_info *ptr = 969 list_entry(head->r.acl, typeof(*ptr), list); 970 if (!tomoyo_print_entry(head, ptr)) 971 return false; 972 } 973 head->r.acl = NULL; 974 return true; 975} 976 977/** 978 * tomoyo_read_domain_policy - Read domain policy. 979 * 980 * @head: Pointer to "struct tomoyo_io_buffer". 981 * 982 * Caller holds tomoyo_read_lock(). 983 */ 984static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) 985{ 986 if (head->r.eof) 987 return; 988 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { 989 struct tomoyo_domain_info *domain = 990 list_entry(head->r.domain, typeof(*domain), list); 991 switch (head->r.step) { 992 case 0: 993 if (domain->is_deleted && 994 !head->r.print_this_domain_only) 995 continue; 996 /* Print domainname and flags. */ 997 tomoyo_set_string(head, domain->domainname->name); 998 tomoyo_set_lf(head); 999 tomoyo_io_printf(head, 1000 TOMOYO_KEYWORD_USE_PROFILE "%u\n", 1001 domain->profile); 1002 if (domain->quota_warned) 1003 tomoyo_set_string(head, "quota_exceeded\n"); 1004 if (domain->transition_failed) 1005 tomoyo_set_string(head, "transition_failed\n"); 1006 if (domain->ignore_global_allow_read) 1007 tomoyo_set_string(head, 1008 TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ 1009 "\n"); 1010 head->r.step++; 1011 tomoyo_set_lf(head); 1012 /* fall through */ 1013 case 1: 1014 if (!tomoyo_read_domain2(head, domain)) 1015 return; 1016 head->r.step++; 1017 if (!tomoyo_set_lf(head)) 1018 return; 1019 /* fall through */ 1020 case 2: 1021 head->r.step = 0; 1022 if (head->r.print_this_domain_only) 1023 goto done; 1024 } 1025 } 1026 done: 1027 head->r.eof = true; 1028} 1029 1030/** 1031 * tomoyo_write_domain_profile - Assign profile for specified domain. 1032 * 1033 * @head: Pointer to "struct tomoyo_io_buffer". 1034 * 1035 * Returns 0 on success, -EINVAL otherwise. 1036 * 1037 * This is equivalent to doing 1038 * 1039 * ( echo "select " $domainname; echo "use_profile " $profile ) | 1040 * /usr/sbin/tomoyo-loadpolicy -d 1041 * 1042 * Caller holds tomoyo_read_lock(). 1043 */ 1044static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) 1045{ 1046 char *data = head->write_buf; 1047 char *cp = strchr(data, ' '); 1048 struct tomoyo_domain_info *domain; 1049 unsigned long profile; 1050 1051 if (!cp) 1052 return -EINVAL; 1053 *cp = '\0'; 1054 domain = tomoyo_find_domain(cp + 1); 1055 if (strict_strtoul(data, 10, &profile)) 1056 return -EINVAL; 1057 if (domain && profile < TOMOYO_MAX_PROFILES 1058 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) 1059 domain->profile = (u8) profile; 1060 return 0; 1061} 1062 1063/** 1064 * tomoyo_read_domain_profile - Read only domainname and profile. 1065 * 1066 * @head: Pointer to "struct tomoyo_io_buffer". 1067 * 1068 * Returns list of profile number and domainname pairs. 1069 * 1070 * This is equivalent to doing 1071 * 1072 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | 1073 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) 1074 * domainname = $0; } else if ( $1 == "use_profile" ) { 1075 * print $2 " " domainname; domainname = ""; } } ; ' 1076 * 1077 * Caller holds tomoyo_read_lock(). 1078 */ 1079static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) 1080{ 1081 if (head->r.eof) 1082 return; 1083 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { 1084 struct tomoyo_domain_info *domain = 1085 list_entry(head->r.domain, typeof(*domain), list); 1086 if (domain->is_deleted) 1087 continue; 1088 if (!tomoyo_flush(head)) 1089 return; 1090 tomoyo_io_printf(head, "%u ", domain->profile); 1091 tomoyo_set_string(head, domain->domainname->name); 1092 tomoyo_set_lf(head); 1093 } 1094 head->r.eof = true; 1095} 1096 1097/** 1098 * tomoyo_write_pid: Specify PID to obtain domainname. 1099 * 1100 * @head: Pointer to "struct tomoyo_io_buffer". 1101 * 1102 * Returns 0. 1103 */ 1104static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1105{ 1106 head->r.eof = false; 1107 return 0; 1108} 1109 1110/** 1111 * tomoyo_read_pid - Get domainname of the specified PID. 1112 * 1113 * @head: Pointer to "struct tomoyo_io_buffer". 1114 * 1115 * Returns the domainname which the specified PID is in on success, 1116 * empty string otherwise. 1117 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1118 * using read()/write() interface rather than sysctl() interface. 1119 */ 1120static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1121{ 1122 char *buf = head->write_buf; 1123 bool global_pid = false; 1124 unsigned int pid; 1125 struct task_struct *p; 1126 struct tomoyo_domain_info *domain = NULL; 1127 1128 /* Accessing write_buf is safe because head->io_sem is held. */ 1129 if (!buf) { 1130 head->r.eof = true; 1131 return; /* Do nothing if open(O_RDONLY). */ 1132 } 1133 if (head->r.w_pos || head->r.eof) 1134 return; 1135 head->r.eof = true; 1136 if (tomoyo_str_starts(&buf, "global-pid ")) 1137 global_pid = true; 1138 pid = (unsigned int) simple_strtoul(buf, NULL, 10); 1139 rcu_read_lock(); 1140 read_lock(&tasklist_lock); 1141 if (global_pid) 1142 p = find_task_by_pid_ns(pid, &init_pid_ns); 1143 else 1144 p = find_task_by_vpid(pid); 1145 if (p) 1146 domain = tomoyo_real_domain(p); 1147 read_unlock(&tasklist_lock); 1148 rcu_read_unlock(); 1149 if (!domain) 1150 return; 1151 tomoyo_io_printf(head, "%u %u ", pid, domain->profile); 1152 tomoyo_set_string(head, domain->domainname->name); 1153} 1154 1155static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1156 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] 1157 = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN, 1158 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] 1159 = TOMOYO_KEYWORD_INITIALIZE_DOMAIN, 1160 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN, 1161 [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN 1162}; 1163 1164/** 1165 * tomoyo_write_exception_policy - Write exception policy. 1166 * 1167 * @head: Pointer to "struct tomoyo_io_buffer". 1168 * 1169 * Returns 0 on success, negative value otherwise. 1170 * 1171 * Caller holds tomoyo_read_lock(). 1172 */ 1173static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) 1174{ 1175 char *data = head->write_buf; 1176 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 1177 u8 i; 1178 1179 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) { 1180 if (tomoyo_str_starts(&data, tomoyo_transition_type[i])) 1181 return tomoyo_write_transition_control(data, is_delete, 1182 i); 1183 } 1184 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR)) 1185 return tomoyo_write_aggregator_policy(data, is_delete); 1186 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) 1187 return tomoyo_write_globally_readable_policy(data, is_delete); 1188 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) 1189 return tomoyo_write_pattern_policy(data, is_delete); 1190 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) 1191 return tomoyo_write_no_rewrite_policy(data, is_delete); 1192 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) 1193 return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP); 1194 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) 1195 return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP); 1196 return -EINVAL; 1197} 1198 1199static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1200 [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP, 1201 [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP 1202}; 1203 1204/** 1205 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list. 1206 * 1207 * @head: Pointer to "struct tomoyo_io_buffer". 1208 * @idx: Index number. 1209 * 1210 * Returns true on success, false otherwise. 1211 * 1212 * Caller holds tomoyo_read_lock(). 1213 */ 1214static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1215{ 1216 list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) { 1217 struct tomoyo_group *group = 1218 list_entry(head->r.group, typeof(*group), list); 1219 list_for_each_cookie(head->r.acl, &group->member_list) { 1220 struct tomoyo_acl_head *ptr = 1221 list_entry(head->r.acl, typeof(*ptr), list); 1222 if (ptr->is_deleted) 1223 continue; 1224 if (!tomoyo_flush(head)) 1225 return false; 1226 tomoyo_set_string(head, tomoyo_group_name[idx]); 1227 tomoyo_set_string(head, group->group_name->name); 1228 if (idx == TOMOYO_PATH_GROUP) { 1229 tomoyo_set_space(head); 1230 tomoyo_set_string(head, container_of 1231 (ptr, struct tomoyo_path_group, 1232 head)->member_name->name); 1233 } else if (idx == TOMOYO_NUMBER_GROUP) { 1234 tomoyo_print_number_union(head, &container_of 1235 (ptr, 1236 struct tomoyo_number_group, 1237 head)->number); 1238 } 1239 tomoyo_set_lf(head); 1240 } 1241 head->r.acl = NULL; 1242 } 1243 head->r.group = NULL; 1244 return true; 1245} 1246 1247/** 1248 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1249 * 1250 * @head: Pointer to "struct tomoyo_io_buffer". 1251 * @idx: Index number. 1252 * 1253 * Returns true on success, false otherwise. 1254 * 1255 * Caller holds tomoyo_read_lock(). 1256 */ 1257static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1258{ 1259 list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) { 1260 struct tomoyo_acl_head *acl = 1261 container_of(head->r.acl, typeof(*acl), list); 1262 if (acl->is_deleted) 1263 continue; 1264 if (!tomoyo_flush(head)) 1265 return false; 1266 switch (idx) { 1267 case TOMOYO_ID_TRANSITION_CONTROL: 1268 { 1269 struct tomoyo_transition_control *ptr = 1270 container_of(acl, typeof(*ptr), head); 1271 tomoyo_set_string(head, 1272 tomoyo_transition_type 1273 [ptr->type]); 1274 if (ptr->program) 1275 tomoyo_set_string(head, 1276 ptr->program->name); 1277 if (ptr->program && ptr->domainname) 1278 tomoyo_set_string(head, " from "); 1279 if (ptr->domainname) 1280 tomoyo_set_string(head, 1281 ptr->domainname-> 1282 name); 1283 } 1284 break; 1285 case TOMOYO_ID_GLOBALLY_READABLE: 1286 { 1287 struct tomoyo_globally_readable_file_entry *ptr 1288 = container_of(acl, typeof(*ptr), head); 1289 tomoyo_set_string(head, 1290 TOMOYO_KEYWORD_ALLOW_READ); 1291 tomoyo_set_string(head, ptr->filename->name); 1292 } 1293 break; 1294 case TOMOYO_ID_AGGREGATOR: 1295 { 1296 struct tomoyo_aggregator_entry *ptr = 1297 container_of(acl, typeof(*ptr), head); 1298 tomoyo_set_string(head, 1299 TOMOYO_KEYWORD_AGGREGATOR); 1300 tomoyo_set_string(head, 1301 ptr->original_name->name); 1302 tomoyo_set_space(head); 1303 tomoyo_set_string(head, 1304 ptr->aggregated_name->name); 1305 } 1306 break; 1307 case TOMOYO_ID_PATTERN: 1308 { 1309 struct tomoyo_pattern_entry *ptr = 1310 container_of(acl, typeof(*ptr), head); 1311 tomoyo_set_string(head, 1312 TOMOYO_KEYWORD_FILE_PATTERN); 1313 tomoyo_set_string(head, ptr->pattern->name); 1314 } 1315 break; 1316 case TOMOYO_ID_NO_REWRITE: 1317 { 1318 struct tomoyo_no_rewrite_entry *ptr = 1319 container_of(acl, typeof(*ptr), head); 1320 tomoyo_set_string(head, 1321 TOMOYO_KEYWORD_DENY_REWRITE); 1322 tomoyo_set_string(head, ptr->pattern->name); 1323 } 1324 break; 1325 default: 1326 continue; 1327 } 1328 tomoyo_set_lf(head); 1329 } 1330 head->r.acl = NULL; 1331 return true; 1332} 1333 1334/** 1335 * tomoyo_read_exception_policy - Read exception policy. 1336 * 1337 * @head: Pointer to "struct tomoyo_io_buffer". 1338 * 1339 * Caller holds tomoyo_read_lock(). 1340 */ 1341static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) 1342{ 1343 if (head->r.eof) 1344 return; 1345 while (head->r.step < TOMOYO_MAX_POLICY && 1346 tomoyo_read_policy(head, head->r.step)) 1347 head->r.step++; 1348 if (head->r.step < TOMOYO_MAX_POLICY) 1349 return; 1350 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1351 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) 1352 head->r.step++; 1353 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1354 return; 1355 head->r.eof = true; 1356} 1357 1358/** 1359 * tomoyo_print_header - Get header line of audit log. 1360 * 1361 * @r: Pointer to "struct tomoyo_request_info". 1362 * 1363 * Returns string representation. 1364 * 1365 * This function uses kmalloc(), so caller must kfree() if this function 1366 * didn't return NULL. 1367 */ 1368static char *tomoyo_print_header(struct tomoyo_request_info *r) 1369{ 1370 struct timeval tv; 1371 const pid_t gpid = task_pid_nr(current); 1372 static const int tomoyo_buffer_len = 4096; 1373 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); 1374 if (!buffer) 1375 return NULL; 1376 do_gettimeofday(&tv); 1377 snprintf(buffer, tomoyo_buffer_len - 1, 1378 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" 1379 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" 1380 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", 1381 tv.tv_sec, r->profile, tomoyo_mode[r->mode], gpid, 1382 (pid_t) sys_getpid(), (pid_t) sys_getppid(), 1383 current_uid(), current_gid(), current_euid(), 1384 current_egid(), current_suid(), current_sgid(), 1385 current_fsuid(), current_fsgid()); 1386 return buffer; 1387} 1388 1389/** 1390 * tomoyo_init_audit_log - Allocate buffer for audit logs. 1391 * 1392 * @len: Required size. 1393 * @r: Pointer to "struct tomoyo_request_info". 1394 * 1395 * Returns pointer to allocated memory. 1396 * 1397 * The @len is updated to add the header lines' size on success. 1398 * 1399 * This function uses kzalloc(), so caller must kfree() if this function 1400 * didn't return NULL. 1401 */ 1402static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) 1403{ 1404 char *buf = NULL; 1405 const char *header; 1406 const char *domainname; 1407 if (!r->domain) 1408 r->domain = tomoyo_domain(); 1409 domainname = r->domain->domainname->name; 1410 header = tomoyo_print_header(r); 1411 if (!header) 1412 return NULL; 1413 *len += strlen(domainname) + strlen(header) + 10; 1414 buf = kzalloc(*len, GFP_NOFS); 1415 if (buf) 1416 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); 1417 kfree(header); 1418 return buf; 1419} 1420 1421/* Wait queue for tomoyo_query_list. */ 1422static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1423 1424/* Lock for manipulating tomoyo_query_list. */ 1425static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1426 1427/* Structure for query. */ 1428struct tomoyo_query_entry { 1429 struct list_head list; 1430 char *query; 1431 int query_len; 1432 unsigned int serial; 1433 int timer; 1434 int answer; 1435}; 1436 1437/* The list for "struct tomoyo_query_entry". */ 1438static LIST_HEAD(tomoyo_query_list); 1439 1440/* 1441 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1442 * interface. 1443 */ 1444static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1445 1446/** 1447 * tomoyo_supervisor - Ask for the supervisor's decision. 1448 * 1449 * @r: Pointer to "struct tomoyo_request_info". 1450 * @fmt: The printf()'s format string, followed by parameters. 1451 * 1452 * Returns 0 if the supervisor decided to permit the access request which 1453 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 1454 * supervisor decided to retry the access request which violated the policy in 1455 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 1456 */ 1457int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 1458{ 1459 va_list args; 1460 int error = -EPERM; 1461 int pos; 1462 int len; 1463 static unsigned int tomoyo_serial; 1464 struct tomoyo_query_entry *tomoyo_query_entry = NULL; 1465 bool quota_exceeded = false; 1466 char *header; 1467 switch (r->mode) { 1468 char *buffer; 1469 case TOMOYO_CONFIG_LEARNING: 1470 if (!tomoyo_domain_quota_is_ok(r)) 1471 return 0; 1472 va_start(args, fmt); 1473 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; 1474 va_end(args); 1475 buffer = kmalloc(len, GFP_NOFS); 1476 if (!buffer) 1477 return 0; 1478 va_start(args, fmt); 1479 vsnprintf(buffer, len - 1, fmt, args); 1480 va_end(args); 1481 tomoyo_normalize_line(buffer); 1482 tomoyo_write_domain_policy2(buffer, r->domain, false); 1483 kfree(buffer); 1484 /* fall through */ 1485 case TOMOYO_CONFIG_PERMISSIVE: 1486 return 0; 1487 } 1488 if (!r->domain) 1489 r->domain = tomoyo_domain(); 1490 if (!atomic_read(&tomoyo_query_observers)) 1491 return -EPERM; 1492 va_start(args, fmt); 1493 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; 1494 va_end(args); 1495 header = tomoyo_init_audit_log(&len, r); 1496 if (!header) 1497 goto out; 1498 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); 1499 if (!tomoyo_query_entry) 1500 goto out; 1501 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); 1502 if (!tomoyo_query_entry->query) 1503 goto out; 1504 len = ksize(tomoyo_query_entry->query); 1505 INIT_LIST_HEAD(&tomoyo_query_entry->list); 1506 spin_lock(&tomoyo_query_list_lock); 1507 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + 1508 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { 1509 quota_exceeded = true; 1510 } else { 1511 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); 1512 tomoyo_query_entry->serial = tomoyo_serial++; 1513 } 1514 spin_unlock(&tomoyo_query_list_lock); 1515 if (quota_exceeded) 1516 goto out; 1517 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", 1518 tomoyo_query_entry->serial, r->retry, header); 1519 kfree(header); 1520 header = NULL; 1521 va_start(args, fmt); 1522 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); 1523 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; 1524 va_end(args); 1525 spin_lock(&tomoyo_query_list_lock); 1526 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); 1527 spin_unlock(&tomoyo_query_list_lock); 1528 /* Give 10 seconds for supervisor's opinion. */ 1529 for (tomoyo_query_entry->timer = 0; 1530 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; 1531 tomoyo_query_entry->timer++) { 1532 wake_up(&tomoyo_query_wait); 1533 set_current_state(TASK_INTERRUPTIBLE); 1534 schedule_timeout(HZ / 10); 1535 if (tomoyo_query_entry->answer) 1536 break; 1537 } 1538 spin_lock(&tomoyo_query_list_lock); 1539 list_del(&tomoyo_query_entry->list); 1540 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); 1541 spin_unlock(&tomoyo_query_list_lock); 1542 switch (tomoyo_query_entry->answer) { 1543 case 3: /* Asked to retry by administrator. */ 1544 error = TOMOYO_RETRY_REQUEST; 1545 r->retry++; 1546 break; 1547 case 1: 1548 /* Granted by administrator. */ 1549 error = 0; 1550 break; 1551 case 0: 1552 /* Timed out. */ 1553 break; 1554 default: 1555 /* Rejected by administrator. */ 1556 break; 1557 } 1558 out: 1559 if (tomoyo_query_entry) 1560 kfree(tomoyo_query_entry->query); 1561 kfree(tomoyo_query_entry); 1562 kfree(header); 1563 return error; 1564} 1565 1566/** 1567 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 1568 * 1569 * @file: Pointer to "struct file". 1570 * @wait: Pointer to "poll_table". 1571 * 1572 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 1573 * 1574 * Waits for access requests which violated policy in enforcing mode. 1575 */ 1576static int tomoyo_poll_query(struct file *file, poll_table *wait) 1577{ 1578 struct list_head *tmp; 1579 bool found = false; 1580 u8 i; 1581 for (i = 0; i < 2; i++) { 1582 spin_lock(&tomoyo_query_list_lock); 1583 list_for_each(tmp, &tomoyo_query_list) { 1584 struct tomoyo_query_entry *ptr 1585 = list_entry(tmp, struct tomoyo_query_entry, 1586 list); 1587 if (ptr->answer) 1588 continue; 1589 found = true; 1590 break; 1591 } 1592 spin_unlock(&tomoyo_query_list_lock); 1593 if (found) 1594 return POLLIN | POLLRDNORM; 1595 if (i) 1596 break; 1597 poll_wait(file, &tomoyo_query_wait, wait); 1598 } 1599 return 0; 1600} 1601 1602/** 1603 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 1604 * 1605 * @head: Pointer to "struct tomoyo_io_buffer". 1606 */ 1607static void tomoyo_read_query(struct tomoyo_io_buffer *head) 1608{ 1609 struct list_head *tmp; 1610 int pos = 0; 1611 int len = 0; 1612 char *buf; 1613 if (head->r.w_pos) 1614 return; 1615 if (head->read_buf) { 1616 kfree(head->read_buf); 1617 head->read_buf = NULL; 1618 } 1619 spin_lock(&tomoyo_query_list_lock); 1620 list_for_each(tmp, &tomoyo_query_list) { 1621 struct tomoyo_query_entry *ptr = 1622 list_entry(tmp, typeof(*ptr), list); 1623 if (ptr->answer) 1624 continue; 1625 if (pos++ != head->r.query_index) 1626 continue; 1627 len = ptr->query_len; 1628 break; 1629 } 1630 spin_unlock(&tomoyo_query_list_lock); 1631 if (!len) { 1632 head->r.query_index = 0; 1633 return; 1634 } 1635 buf = kzalloc(len, GFP_NOFS); 1636 if (!buf) 1637 return; 1638 pos = 0; 1639 spin_lock(&tomoyo_query_list_lock); 1640 list_for_each(tmp, &tomoyo_query_list) { 1641 struct tomoyo_query_entry *ptr = 1642 list_entry(tmp, typeof(*ptr), list); 1643 if (ptr->answer) 1644 continue; 1645 if (pos++ != head->r.query_index) 1646 continue; 1647 /* 1648 * Some query can be skipped because tomoyo_query_list 1649 * can change, but I don't care. 1650 */ 1651 if (len == ptr->query_len) 1652 memmove(buf, ptr->query, len); 1653 break; 1654 } 1655 spin_unlock(&tomoyo_query_list_lock); 1656 if (buf[0]) { 1657 head->read_buf = buf; 1658 head->r.w[head->r.w_pos++] = buf; 1659 head->r.query_index++; 1660 } else { 1661 kfree(buf); 1662 } 1663} 1664 1665/** 1666 * tomoyo_write_answer - Write the supervisor's decision. 1667 * 1668 * @head: Pointer to "struct tomoyo_io_buffer". 1669 * 1670 * Returns 0 on success, -EINVAL otherwise. 1671 */ 1672static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 1673{ 1674 char *data = head->write_buf; 1675 struct list_head *tmp; 1676 unsigned int serial; 1677 unsigned int answer; 1678 spin_lock(&tomoyo_query_list_lock); 1679 list_for_each(tmp, &tomoyo_query_list) { 1680 struct tomoyo_query_entry *ptr 1681 = list_entry(tmp, struct tomoyo_query_entry, list); 1682 ptr->timer = 0; 1683 } 1684 spin_unlock(&tomoyo_query_list_lock); 1685 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 1686 return -EINVAL; 1687 spin_lock(&tomoyo_query_list_lock); 1688 list_for_each(tmp, &tomoyo_query_list) { 1689 struct tomoyo_query_entry *ptr 1690 = list_entry(tmp, struct tomoyo_query_entry, list); 1691 if (ptr->serial != serial) 1692 continue; 1693 if (!ptr->answer) 1694 ptr->answer = answer; 1695 break; 1696 } 1697 spin_unlock(&tomoyo_query_list_lock); 1698 return 0; 1699} 1700 1701/** 1702 * tomoyo_read_version: Get version. 1703 * 1704 * @head: Pointer to "struct tomoyo_io_buffer". 1705 * 1706 * Returns version information. 1707 */ 1708static void tomoyo_read_version(struct tomoyo_io_buffer *head) 1709{ 1710 if (!head->r.eof) { 1711 tomoyo_io_printf(head, "2.3.0-pre"); 1712 head->r.eof = true; 1713 } 1714} 1715 1716/** 1717 * tomoyo_read_self_domain - Get the current process's domainname. 1718 * 1719 * @head: Pointer to "struct tomoyo_io_buffer". 1720 * 1721 * Returns the current process's domainname. 1722 */ 1723static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head) 1724{ 1725 if (!head->r.eof) { 1726 /* 1727 * tomoyo_domain()->domainname != NULL 1728 * because every process belongs to a domain and 1729 * the domain's name cannot be NULL. 1730 */ 1731 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); 1732 head->r.eof = true; 1733 } 1734} 1735 1736/** 1737 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 1738 * 1739 * @type: Type of interface. 1740 * @file: Pointer to "struct file". 1741 * 1742 * Associates policy handler and returns 0 on success, -ENOMEM otherwise. 1743 * 1744 * Caller acquires tomoyo_read_lock(). 1745 */ 1746int tomoyo_open_control(const u8 type, struct file *file) 1747{ 1748 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 1749 1750 if (!head) 1751 return -ENOMEM; 1752 mutex_init(&head->io_sem); 1753 head->type = type; 1754 switch (type) { 1755 case TOMOYO_DOMAINPOLICY: 1756 /* /sys/kernel/security/tomoyo/domain_policy */ 1757 head->write = tomoyo_write_domain_policy; 1758 head->read = tomoyo_read_domain_policy; 1759 break; 1760 case TOMOYO_EXCEPTIONPOLICY: 1761 /* /sys/kernel/security/tomoyo/exception_policy */ 1762 head->write = tomoyo_write_exception_policy; 1763 head->read = tomoyo_read_exception_policy; 1764 break; 1765 case TOMOYO_SELFDOMAIN: 1766 /* /sys/kernel/security/tomoyo/self_domain */ 1767 head->read = tomoyo_read_self_domain; 1768 break; 1769 case TOMOYO_DOMAIN_STATUS: 1770 /* /sys/kernel/security/tomoyo/.domain_status */ 1771 head->write = tomoyo_write_domain_profile; 1772 head->read = tomoyo_read_domain_profile; 1773 break; 1774 case TOMOYO_PROCESS_STATUS: 1775 /* /sys/kernel/security/tomoyo/.process_status */ 1776 head->write = tomoyo_write_pid; 1777 head->read = tomoyo_read_pid; 1778 break; 1779 case TOMOYO_VERSION: 1780 /* /sys/kernel/security/tomoyo/version */ 1781 head->read = tomoyo_read_version; 1782 head->readbuf_size = 128; 1783 break; 1784 case TOMOYO_MEMINFO: 1785 /* /sys/kernel/security/tomoyo/meminfo */ 1786 head->write = tomoyo_write_memory_quota; 1787 head->read = tomoyo_read_memory_counter; 1788 head->readbuf_size = 512; 1789 break; 1790 case TOMOYO_PROFILE: 1791 /* /sys/kernel/security/tomoyo/profile */ 1792 head->write = tomoyo_write_profile; 1793 head->read = tomoyo_read_profile; 1794 break; 1795 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 1796 head->poll = tomoyo_poll_query; 1797 head->write = tomoyo_write_answer; 1798 head->read = tomoyo_read_query; 1799 break; 1800 case TOMOYO_MANAGER: 1801 /* /sys/kernel/security/tomoyo/manager */ 1802 head->write = tomoyo_write_manager_policy; 1803 head->read = tomoyo_read_manager_policy; 1804 break; 1805 } 1806 if (!(file->f_mode & FMODE_READ)) { 1807 /* 1808 * No need to allocate read_buf since it is not opened 1809 * for reading. 1810 */ 1811 head->read = NULL; 1812 head->poll = NULL; 1813 } else if (!head->poll) { 1814 /* Don't allocate read_buf for poll() access. */ 1815 if (!head->readbuf_size) 1816 head->readbuf_size = 4096 * 2; 1817 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 1818 if (!head->read_buf) { 1819 kfree(head); 1820 return -ENOMEM; 1821 } 1822 } 1823 if (!(file->f_mode & FMODE_WRITE)) { 1824 /* 1825 * No need to allocate write_buf since it is not opened 1826 * for writing. 1827 */ 1828 head->write = NULL; 1829 } else if (head->write) { 1830 head->writebuf_size = 4096 * 2; 1831 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 1832 if (!head->write_buf) { 1833 kfree(head->read_buf); 1834 kfree(head); 1835 return -ENOMEM; 1836 } 1837 } 1838 if (type != TOMOYO_QUERY) 1839 head->reader_idx = tomoyo_read_lock(); 1840 file->private_data = head; 1841 /* 1842 * Call the handler now if the file is 1843 * /sys/kernel/security/tomoyo/self_domain 1844 * so that the user can use 1845 * cat < /sys/kernel/security/tomoyo/self_domain" 1846 * to know the current process's domainname. 1847 */ 1848 if (type == TOMOYO_SELFDOMAIN) 1849 tomoyo_read_control(file, NULL, 0); 1850 /* 1851 * If the file is /sys/kernel/security/tomoyo/query , increment the 1852 * observer counter. 1853 * The obserber counter is used by tomoyo_supervisor() to see if 1854 * there is some process monitoring /sys/kernel/security/tomoyo/query. 1855 */ 1856 else if (type == TOMOYO_QUERY) 1857 atomic_inc(&tomoyo_query_observers); 1858 return 0; 1859} 1860 1861/** 1862 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 1863 * 1864 * @file: Pointer to "struct file". 1865 * @wait: Pointer to "poll_table". 1866 * 1867 * Waits for read readiness. 1868 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . 1869 */ 1870int tomoyo_poll_control(struct file *file, poll_table *wait) 1871{ 1872 struct tomoyo_io_buffer *head = file->private_data; 1873 if (!head->poll) 1874 return -ENOSYS; 1875 return head->poll(file, wait); 1876} 1877 1878/** 1879 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 1880 * 1881 * @file: Pointer to "struct file". 1882 * @buffer: Poiner to buffer to write to. 1883 * @buffer_len: Size of @buffer. 1884 * 1885 * Returns bytes read on success, negative value otherwise. 1886 * 1887 * Caller holds tomoyo_read_lock(). 1888 */ 1889int tomoyo_read_control(struct file *file, char __user *buffer, 1890 const int buffer_len) 1891{ 1892 int len; 1893 struct tomoyo_io_buffer *head = file->private_data; 1894 1895 if (!head->read) 1896 return -ENOSYS; 1897 if (mutex_lock_interruptible(&head->io_sem)) 1898 return -EINTR; 1899 head->read_user_buf = buffer; 1900 head->read_user_buf_avail = buffer_len; 1901 if (tomoyo_flush(head)) 1902 /* Call the policy handler. */ 1903 head->read(head); 1904 tomoyo_flush(head); 1905 len = head->read_user_buf - buffer; 1906 mutex_unlock(&head->io_sem); 1907 return len; 1908} 1909 1910/** 1911 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 1912 * 1913 * @file: Pointer to "struct file". 1914 * @buffer: Pointer to buffer to read from. 1915 * @buffer_len: Size of @buffer. 1916 * 1917 * Returns @buffer_len on success, negative value otherwise. 1918 * 1919 * Caller holds tomoyo_read_lock(). 1920 */ 1921int tomoyo_write_control(struct file *file, const char __user *buffer, 1922 const int buffer_len) 1923{ 1924 struct tomoyo_io_buffer *head = file->private_data; 1925 int error = buffer_len; 1926 int avail_len = buffer_len; 1927 char *cp0 = head->write_buf; 1928 1929 if (!head->write) 1930 return -ENOSYS; 1931 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 1932 return -EFAULT; 1933 /* Don't allow updating policies by non manager programs. */ 1934 if (head->write != tomoyo_write_pid && 1935 head->write != tomoyo_write_domain_policy && 1936 !tomoyo_policy_manager()) 1937 return -EPERM; 1938 if (mutex_lock_interruptible(&head->io_sem)) 1939 return -EINTR; 1940 /* Read a line and dispatch it to the policy handler. */ 1941 while (avail_len > 0) { 1942 char c; 1943 if (head->write_avail >= head->writebuf_size - 1) { 1944 error = -ENOMEM; 1945 break; 1946 } else if (get_user(c, buffer)) { 1947 error = -EFAULT; 1948 break; 1949 } 1950 buffer++; 1951 avail_len--; 1952 cp0[head->write_avail++] = c; 1953 if (c != '\n') 1954 continue; 1955 cp0[head->write_avail - 1] = '\0'; 1956 head->write_avail = 0; 1957 tomoyo_normalize_line(cp0); 1958 head->write(head); 1959 } 1960 mutex_unlock(&head->io_sem); 1961 return error; 1962} 1963 1964/** 1965 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 1966 * 1967 * @file: Pointer to "struct file". 1968 * 1969 * Releases memory and returns 0. 1970 * 1971 * Caller looses tomoyo_read_lock(). 1972 */ 1973int tomoyo_close_control(struct file *file) 1974{ 1975 struct tomoyo_io_buffer *head = file->private_data; 1976 const bool is_write = !!head->write_buf; 1977 1978 /* 1979 * If the file is /sys/kernel/security/tomoyo/query , decrement the 1980 * observer counter. 1981 */ 1982 if (head->type == TOMOYO_QUERY) 1983 atomic_dec(&tomoyo_query_observers); 1984 else 1985 tomoyo_read_unlock(head->reader_idx); 1986 /* Release memory used for policy I/O. */ 1987 kfree(head->read_buf); 1988 head->read_buf = NULL; 1989 kfree(head->write_buf); 1990 head->write_buf = NULL; 1991 kfree(head); 1992 head = NULL; 1993 file->private_data = NULL; 1994 if (is_write) 1995 tomoyo_run_gc(); 1996 return 0; 1997} 1998 1999/** 2000 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2001 */ 2002void tomoyo_check_profile(void) 2003{ 2004 struct tomoyo_domain_info *domain; 2005 const int idx = tomoyo_read_lock(); 2006 tomoyo_policy_loaded = true; 2007 /* Check all profiles currently assigned to domains are defined. */ 2008 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2009 const u8 profile = domain->profile; 2010 if (tomoyo_profile_ptr[profile]) 2011 continue; 2012 panic("Profile %u (used by '%s') not defined.\n", 2013 profile, domain->domainname->name); 2014 } 2015 tomoyo_read_unlock(idx); 2016 if (tomoyo_profile_version != 20090903) 2017 panic("Profile version %u is not supported.\n", 2018 tomoyo_profile_version); 2019 printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n"); 2020 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2021} 2022