common.c revision 237ab459f12cb98eadd3fe7b85343e183a1076a4
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[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 79/** 80 * tomoyo_print_name_union - Print a tomoyo_name_union. 81 * 82 * @head: Pointer to "struct tomoyo_io_buffer". 83 * @ptr: Pointer to "struct tomoyo_name_union". 84 * 85 * Returns true on success, false otherwise. 86 */ 87static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head, 88 const struct tomoyo_name_union *ptr) 89{ 90 int pos = head->read_avail; 91 if (pos && head->read_buf[pos - 1] == ' ') 92 head->read_avail--; 93 if (ptr->is_group) 94 return tomoyo_io_printf(head, " @%s", 95 ptr->group->group_name->name); 96 return tomoyo_io_printf(head, " %s", ptr->filename->name); 97} 98 99/** 100 * tomoyo_print_number_union - Print a tomoyo_number_union. 101 * 102 * @head: Pointer to "struct tomoyo_io_buffer". 103 * @ptr: Pointer to "struct tomoyo_number_union". 104 * 105 * Returns true on success, false otherwise. 106 */ 107bool tomoyo_print_number_union(struct tomoyo_io_buffer *head, 108 const struct tomoyo_number_union *ptr) 109{ 110 unsigned long min; 111 unsigned long max; 112 u8 min_type; 113 u8 max_type; 114 if (!tomoyo_io_printf(head, " ")) 115 return false; 116 if (ptr->is_group) 117 return tomoyo_io_printf(head, "@%s", 118 ptr->group->group_name->name); 119 min_type = ptr->min_type; 120 max_type = ptr->max_type; 121 min = ptr->values[0]; 122 max = ptr->values[1]; 123 switch (min_type) { 124 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 125 if (!tomoyo_io_printf(head, "0x%lX", min)) 126 return false; 127 break; 128 case TOMOYO_VALUE_TYPE_OCTAL: 129 if (!tomoyo_io_printf(head, "0%lo", min)) 130 return false; 131 break; 132 default: 133 if (!tomoyo_io_printf(head, "%lu", min)) 134 return false; 135 break; 136 } 137 if (min == max && min_type == max_type) 138 return true; 139 switch (max_type) { 140 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 141 return tomoyo_io_printf(head, "-0x%lX", max); 142 case TOMOYO_VALUE_TYPE_OCTAL: 143 return tomoyo_io_printf(head, "-0%lo", max); 144 default: 145 return tomoyo_io_printf(head, "-%lu", max); 146 } 147} 148 149/** 150 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure. 151 * 152 * @head: Pointer to "struct tomoyo_io_buffer". 153 * @fmt: The printf()'s format string, followed by parameters. 154 * 155 * Returns true if output was written, false otherwise. 156 * 157 * The snprintf() will truncate, but tomoyo_io_printf() won't. 158 */ 159bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) 160{ 161 va_list args; 162 int len; 163 int pos = head->read_avail; 164 int size = head->readbuf_size - pos; 165 166 if (size <= 0) 167 return false; 168 va_start(args, fmt); 169 len = vsnprintf(head->read_buf + pos, size, fmt, args); 170 va_end(args); 171 if (pos + len >= head->readbuf_size) 172 return false; 173 head->read_avail += len; 174 return true; 175} 176 177/** 178 * tomoyo_find_or_assign_new_profile - Create a new profile. 179 * 180 * @profile: Profile number to create. 181 * 182 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. 183 */ 184static struct tomoyo_profile *tomoyo_find_or_assign_new_profile 185(const unsigned int profile) 186{ 187 struct tomoyo_profile *ptr; 188 struct tomoyo_profile *entry; 189 if (profile >= TOMOYO_MAX_PROFILES) 190 return NULL; 191 ptr = tomoyo_profile_ptr[profile]; 192 if (ptr) 193 return ptr; 194 entry = kzalloc(sizeof(*entry), GFP_NOFS); 195 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 196 goto out; 197 ptr = tomoyo_profile_ptr[profile]; 198 if (!ptr && tomoyo_memory_ok(entry)) { 199 ptr = entry; 200 ptr->learning = &tomoyo_default_profile.preference; 201 ptr->permissive = &tomoyo_default_profile.preference; 202 ptr->enforcing = &tomoyo_default_profile.preference; 203 ptr->default_config = TOMOYO_CONFIG_DISABLED; 204 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT, 205 sizeof(ptr->config)); 206 mb(); /* Avoid out-of-order execution. */ 207 tomoyo_profile_ptr[profile] = ptr; 208 entry = NULL; 209 } 210 mutex_unlock(&tomoyo_policy_lock); 211 out: 212 kfree(entry); 213 return ptr; 214} 215 216/** 217 * tomoyo_profile - Find a profile. 218 * 219 * @profile: Profile number to find. 220 * 221 * Returns pointer to "struct tomoyo_profile". 222 */ 223struct tomoyo_profile *tomoyo_profile(const u8 profile) 224{ 225 struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile]; 226 if (!tomoyo_policy_loaded) 227 return &tomoyo_default_profile; 228 BUG_ON(!ptr); 229 return ptr; 230} 231 232/** 233 * tomoyo_write_profile - Write profile table. 234 * 235 * @head: Pointer to "struct tomoyo_io_buffer". 236 * 237 * Returns 0 on success, negative value otherwise. 238 */ 239static int tomoyo_write_profile(struct tomoyo_io_buffer *head) 240{ 241 char *data = head->write_buf; 242 unsigned int i; 243 int value; 244 int mode; 245 u8 config; 246 bool use_default = false; 247 char *cp; 248 struct tomoyo_profile *profile; 249 if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1) 250 return 0; 251 i = simple_strtoul(data, &cp, 10); 252 if (data == cp) { 253 profile = &tomoyo_default_profile; 254 } else { 255 if (*cp != '-') 256 return -EINVAL; 257 data = cp + 1; 258 profile = tomoyo_find_or_assign_new_profile(i); 259 if (!profile) 260 return -EINVAL; 261 } 262 cp = strchr(data, '='); 263 if (!cp) 264 return -EINVAL; 265 *cp++ = '\0'; 266 if (profile != &tomoyo_default_profile) 267 use_default = strstr(cp, "use_default") != NULL; 268 if (strstr(cp, "verbose=yes")) 269 value = 1; 270 else if (strstr(cp, "verbose=no")) 271 value = 0; 272 else 273 value = -1; 274 if (!strcmp(data, "PREFERENCE::enforcing")) { 275 if (use_default) { 276 profile->enforcing = &tomoyo_default_profile.preference; 277 return 0; 278 } 279 profile->enforcing = &profile->preference; 280 if (value >= 0) 281 profile->preference.enforcing_verbose = value; 282 return 0; 283 } 284 if (!strcmp(data, "PREFERENCE::permissive")) { 285 if (use_default) { 286 profile->permissive = &tomoyo_default_profile.preference; 287 return 0; 288 } 289 profile->permissive = &profile->preference; 290 if (value >= 0) 291 profile->preference.permissive_verbose = value; 292 return 0; 293 } 294 if (!strcmp(data, "PREFERENCE::learning")) { 295 char *cp2; 296 if (use_default) { 297 profile->learning = &tomoyo_default_profile.preference; 298 return 0; 299 } 300 profile->learning = &profile->preference; 301 if (value >= 0) 302 profile->preference.learning_verbose = value; 303 cp2 = strstr(cp, "max_entry="); 304 if (cp2) 305 sscanf(cp2 + 10, "%u", 306 &profile->preference.learning_max_entry); 307 return 0; 308 } 309 if (profile == &tomoyo_default_profile) 310 return -EINVAL; 311 if (!strcmp(data, "COMMENT")) { 312 const struct tomoyo_path_info *old_comment = profile->comment; 313 profile->comment = tomoyo_get_name(cp); 314 tomoyo_put_name(old_comment); 315 return 0; 316 } 317 if (!strcmp(data, "CONFIG")) { 318 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; 319 config = profile->default_config; 320 } else if (tomoyo_str_starts(&data, "CONFIG::")) { 321 config = 0; 322 for (i = 0; i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { 323 if (strcmp(data, tomoyo_mac_keywords[i])) 324 continue; 325 config = profile->config[i]; 326 break; 327 } 328 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 329 return -EINVAL; 330 } else { 331 return -EINVAL; 332 } 333 if (use_default) { 334 config = TOMOYO_CONFIG_USE_DEFAULT; 335 } else { 336 for (mode = 3; mode >= 0; mode--) 337 if (strstr(cp, tomoyo_mode_4[mode])) 338 /* 339 * Update lower 3 bits in order to distinguish 340 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'. 341 */ 342 config = (config & ~7) | mode; 343 } 344 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) 345 profile->config[i] = config; 346 else if (config != TOMOYO_CONFIG_USE_DEFAULT) 347 profile->default_config = config; 348 return 0; 349} 350 351/** 352 * tomoyo_read_profile - Read profile table. 353 * 354 * @head: Pointer to "struct tomoyo_io_buffer". 355 * 356 * Returns 0. 357 */ 358static int tomoyo_read_profile(struct tomoyo_io_buffer *head) 359{ 360 int index; 361 if (head->read_eof) 362 return 0; 363 if (head->read_bit) 364 goto body; 365 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903"); 366 tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s " 367 "max_entry=%u }\n", 368 tomoyo_yesno(tomoyo_default_profile.preference. 369 learning_verbose), 370 tomoyo_default_profile.preference.learning_max_entry); 371 tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n", 372 tomoyo_yesno(tomoyo_default_profile.preference. 373 permissive_verbose)); 374 tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s }\n", 375 tomoyo_yesno(tomoyo_default_profile.preference. 376 enforcing_verbose)); 377 head->read_bit = 1; 378 body: 379 for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) { 380 bool done; 381 u8 config; 382 int i; 383 int pos; 384 const struct tomoyo_profile *profile 385 = tomoyo_profile_ptr[index]; 386 const struct tomoyo_path_info *comment; 387 head->read_step = index; 388 if (!profile) 389 continue; 390 pos = head->read_avail; 391 comment = profile->comment; 392 done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index, 393 comment ? comment->name : ""); 394 if (!done) 395 goto out; 396 config = profile->default_config; 397 if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index, 398 tomoyo_mode_4[config & 3])) 399 goto out; 400 for (i = 0; i < TOMOYO_MAX_MAC_INDEX + 401 TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { 402 config = profile->config[i]; 403 if (config == TOMOYO_CONFIG_USE_DEFAULT) 404 continue; 405 if (!tomoyo_io_printf(head, 406 "%u-CONFIG::%s={ mode=%s }\n", 407 index, tomoyo_mac_keywords[i], 408 tomoyo_mode_4[config & 3])) 409 goto out; 410 } 411 if (profile->learning != &tomoyo_default_profile.preference && 412 !tomoyo_io_printf(head, "%u-PREFERENCE::learning={ " 413 "verbose=%s max_entry=%u }\n", index, 414 tomoyo_yesno(profile->preference. 415 learning_verbose), 416 profile->preference.learning_max_entry)) 417 goto out; 418 if (profile->permissive != &tomoyo_default_profile.preference 419 && !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ " 420 "verbose=%s }\n", index, 421 tomoyo_yesno(profile->preference. 422 permissive_verbose))) 423 goto out; 424 if (profile->enforcing != &tomoyo_default_profile.preference && 425 !tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ " 426 "verbose=%s }\n", index, 427 tomoyo_yesno(profile->preference. 428 enforcing_verbose))) 429 goto out; 430 continue; 431 out: 432 head->read_avail = pos; 433 break; 434 } 435 if (index == TOMOYO_MAX_PROFILES) 436 head->read_eof = true; 437 return 0; 438} 439 440/* 441 * tomoyo_policy_manager_list is used for holding list of domainnames or 442 * programs which are permitted to modify configuration via 443 * /sys/kernel/security/tomoyo/ interface. 444 * 445 * An entry is added by 446 * 447 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \ 448 * /sys/kernel/security/tomoyo/manager 449 * (if you want to specify by a domainname) 450 * 451 * or 452 * 453 * # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager 454 * (if you want to specify by a program's location) 455 * 456 * and is deleted by 457 * 458 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \ 459 * /sys/kernel/security/tomoyo/manager 460 * 461 * or 462 * 463 * # echo 'delete /usr/sbin/tomoyo-editpolicy' > \ 464 * /sys/kernel/security/tomoyo/manager 465 * 466 * and all entries are retrieved by 467 * 468 * # cat /sys/kernel/security/tomoyo/manager 469 */ 470LIST_HEAD(tomoyo_policy_manager_list); 471 472/** 473 * tomoyo_update_manager_entry - Add a manager entry. 474 * 475 * @manager: The path to manager or the domainnamme. 476 * @is_delete: True if it is a delete request. 477 * 478 * Returns 0 on success, negative value otherwise. 479 * 480 * Caller holds tomoyo_read_lock(). 481 */ 482static int tomoyo_update_manager_entry(const char *manager, 483 const bool is_delete) 484{ 485 struct tomoyo_policy_manager_entry *ptr; 486 struct tomoyo_policy_manager_entry e = { }; 487 int error = is_delete ? -ENOENT : -ENOMEM; 488 489 if (tomoyo_is_domain_def(manager)) { 490 if (!tomoyo_is_correct_domain(manager)) 491 return -EINVAL; 492 e.is_domain = true; 493 } else { 494 if (!tomoyo_is_correct_path(manager)) 495 return -EINVAL; 496 } 497 e.manager = tomoyo_get_name(manager); 498 if (!e.manager) 499 return -ENOMEM; 500 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 501 goto out; 502 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { 503 if (ptr->manager != e.manager) 504 continue; 505 ptr->is_deleted = is_delete; 506 error = 0; 507 break; 508 } 509 if (!is_delete && error) { 510 struct tomoyo_policy_manager_entry *entry = 511 tomoyo_commit_ok(&e, sizeof(e)); 512 if (entry) { 513 list_add_tail_rcu(&entry->list, 514 &tomoyo_policy_manager_list); 515 error = 0; 516 } 517 } 518 mutex_unlock(&tomoyo_policy_lock); 519 out: 520 tomoyo_put_name(e.manager); 521 return error; 522} 523 524/** 525 * tomoyo_write_manager_policy - Write manager policy. 526 * 527 * @head: Pointer to "struct tomoyo_io_buffer". 528 * 529 * Returns 0 on success, negative value otherwise. 530 * 531 * Caller holds tomoyo_read_lock(). 532 */ 533static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) 534{ 535 char *data = head->write_buf; 536 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 537 538 if (!strcmp(data, "manage_by_non_root")) { 539 tomoyo_manage_by_non_root = !is_delete; 540 return 0; 541 } 542 return tomoyo_update_manager_entry(data, is_delete); 543} 544 545/** 546 * tomoyo_read_manager_policy - Read manager policy. 547 * 548 * @head: Pointer to "struct tomoyo_io_buffer". 549 * 550 * Returns 0. 551 * 552 * Caller holds tomoyo_read_lock(). 553 */ 554static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) 555{ 556 struct list_head *pos; 557 bool done = true; 558 559 if (head->read_eof) 560 return 0; 561 list_for_each_cookie(pos, head->read_var2, 562 &tomoyo_policy_manager_list) { 563 struct tomoyo_policy_manager_entry *ptr; 564 ptr = list_entry(pos, struct tomoyo_policy_manager_entry, 565 list); 566 if (ptr->is_deleted) 567 continue; 568 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); 569 if (!done) 570 break; 571 } 572 head->read_eof = done; 573 return 0; 574} 575 576/** 577 * tomoyo_is_policy_manager - Check whether the current process is a policy manager. 578 * 579 * Returns true if the current process is permitted to modify policy 580 * via /sys/kernel/security/tomoyo/ interface. 581 * 582 * Caller holds tomoyo_read_lock(). 583 */ 584static bool tomoyo_is_policy_manager(void) 585{ 586 struct tomoyo_policy_manager_entry *ptr; 587 const char *exe; 588 const struct task_struct *task = current; 589 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; 590 bool found = false; 591 592 if (!tomoyo_policy_loaded) 593 return true; 594 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) 595 return false; 596 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { 597 if (!ptr->is_deleted && ptr->is_domain 598 && !tomoyo_pathcmp(domainname, ptr->manager)) { 599 found = true; 600 break; 601 } 602 } 603 if (found) 604 return true; 605 exe = tomoyo_get_exe(); 606 if (!exe) 607 return false; 608 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { 609 if (!ptr->is_deleted && !ptr->is_domain 610 && !strcmp(exe, ptr->manager->name)) { 611 found = true; 612 break; 613 } 614 } 615 if (!found) { /* Reduce error messages. */ 616 static pid_t last_pid; 617 const pid_t pid = current->pid; 618 if (last_pid != pid) { 619 printk(KERN_WARNING "%s ( %s ) is not permitted to " 620 "update policies.\n", domainname->name, exe); 621 last_pid = pid; 622 } 623 } 624 kfree(exe); 625 return found; 626} 627 628/** 629 * tomoyo_is_select_one - Parse select command. 630 * 631 * @head: Pointer to "struct tomoyo_io_buffer". 632 * @data: String to parse. 633 * 634 * Returns true on success, false otherwise. 635 * 636 * Caller holds tomoyo_read_lock(). 637 */ 638static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head, 639 const char *data) 640{ 641 unsigned int pid; 642 struct tomoyo_domain_info *domain = NULL; 643 bool global_pid = false; 644 645 if (sscanf(data, "pid=%u", &pid) == 1 || 646 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 647 struct task_struct *p; 648 rcu_read_lock(); 649 read_lock(&tasklist_lock); 650 if (global_pid) 651 p = find_task_by_pid_ns(pid, &init_pid_ns); 652 else 653 p = find_task_by_vpid(pid); 654 if (p) 655 domain = tomoyo_real_domain(p); 656 read_unlock(&tasklist_lock); 657 rcu_read_unlock(); 658 } else if (!strncmp(data, "domain=", 7)) { 659 if (tomoyo_is_domain_def(data + 7)) 660 domain = tomoyo_find_domain(data + 7); 661 } else 662 return false; 663 head->write_var1 = domain; 664 /* Accessing read_buf is safe because head->io_sem is held. */ 665 if (!head->read_buf) 666 return true; /* Do nothing if open(O_WRONLY). */ 667 head->read_avail = 0; 668 tomoyo_io_printf(head, "# select %s\n", data); 669 head->read_single_domain = true; 670 head->read_eof = !domain; 671 if (domain) { 672 struct tomoyo_domain_info *d; 673 head->read_var1 = NULL; 674 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) { 675 if (d == domain) 676 break; 677 head->read_var1 = &d->list; 678 } 679 head->read_var2 = NULL; 680 head->read_bit = 0; 681 head->read_step = 0; 682 if (domain->is_deleted) 683 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 684 } 685 return true; 686} 687 688/** 689 * tomoyo_delete_domain - Delete a domain. 690 * 691 * @domainname: The name of domain. 692 * 693 * Returns 0. 694 * 695 * Caller holds tomoyo_read_lock(). 696 */ 697static int tomoyo_delete_domain(char *domainname) 698{ 699 struct tomoyo_domain_info *domain; 700 struct tomoyo_path_info name; 701 702 name.name = domainname; 703 tomoyo_fill_path_info(&name); 704 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 705 return 0; 706 /* Is there an active domain? */ 707 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 708 /* Never delete tomoyo_kernel_domain */ 709 if (domain == &tomoyo_kernel_domain) 710 continue; 711 if (domain->is_deleted || 712 tomoyo_pathcmp(domain->domainname, &name)) 713 continue; 714 domain->is_deleted = true; 715 break; 716 } 717 mutex_unlock(&tomoyo_policy_lock); 718 return 0; 719} 720 721/** 722 * tomoyo_write_domain_policy2 - Write domain policy. 723 * 724 * @head: Pointer to "struct tomoyo_io_buffer". 725 * 726 * Returns 0 on success, negative value otherwise. 727 * 728 * Caller holds tomoyo_read_lock(). 729 */ 730static int tomoyo_write_domain_policy2(char *data, 731 struct tomoyo_domain_info *domain, 732 const bool is_delete) 733{ 734 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) 735 return tomoyo_write_mount_policy(data, domain, is_delete); 736 return tomoyo_write_file_policy(data, domain, is_delete); 737} 738 739/** 740 * tomoyo_write_domain_policy - Write domain policy. 741 * 742 * @head: Pointer to "struct tomoyo_io_buffer". 743 * 744 * Returns 0 on success, negative value otherwise. 745 * 746 * Caller holds tomoyo_read_lock(). 747 */ 748static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) 749{ 750 char *data = head->write_buf; 751 struct tomoyo_domain_info *domain = head->write_var1; 752 bool is_delete = false; 753 bool is_select = false; 754 unsigned int profile; 755 756 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) 757 is_delete = true; 758 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) 759 is_select = true; 760 if (is_select && tomoyo_is_select_one(head, data)) 761 return 0; 762 /* Don't allow updating policies by non manager programs. */ 763 if (!tomoyo_is_policy_manager()) 764 return -EPERM; 765 if (tomoyo_is_domain_def(data)) { 766 domain = NULL; 767 if (is_delete) 768 tomoyo_delete_domain(data); 769 else if (is_select) 770 domain = tomoyo_find_domain(data); 771 else 772 domain = tomoyo_find_or_assign_new_domain(data, 0); 773 head->write_var1 = domain; 774 return 0; 775 } 776 if (!domain) 777 return -EINVAL; 778 779 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 780 && profile < TOMOYO_MAX_PROFILES) { 781 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) 782 domain->profile = (u8) profile; 783 return 0; 784 } 785 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { 786 domain->ignore_global_allow_read = !is_delete; 787 return 0; 788 } 789 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { 790 domain->quota_warned = !is_delete; 791 return 0; 792 } 793 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { 794 domain->transition_failed = !is_delete; 795 return 0; 796 } 797 return tomoyo_write_domain_policy2(data, domain, is_delete); 798} 799 800/** 801 * tomoyo_print_path_acl - Print a single path ACL entry. 802 * 803 * @head: Pointer to "struct tomoyo_io_buffer". 804 * @ptr: Pointer to "struct tomoyo_path_acl". 805 * 806 * Returns true on success, false otherwise. 807 */ 808static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, 809 struct tomoyo_path_acl *ptr) 810{ 811 int pos; 812 u8 bit; 813 const u16 perm = ptr->perm; 814 815 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 816 if (!(perm & (1 << bit))) 817 continue; 818 /* Print "read/write" instead of "read" and "write". */ 819 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) 820 && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) 821 continue; 822 pos = head->read_avail; 823 if (!tomoyo_io_printf(head, "allow_%s ", 824 tomoyo_path2keyword(bit)) || 825 !tomoyo_print_name_union(head, &ptr->name) || 826 !tomoyo_io_printf(head, "\n")) 827 goto out; 828 } 829 head->read_bit = 0; 830 return true; 831 out: 832 head->read_bit = bit; 833 head->read_avail = pos; 834 return false; 835} 836 837/** 838 * tomoyo_print_path2_acl - Print a double path ACL entry. 839 * 840 * @head: Pointer to "struct tomoyo_io_buffer". 841 * @ptr: Pointer to "struct tomoyo_path2_acl". 842 * 843 * Returns true on success, false otherwise. 844 */ 845static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, 846 struct tomoyo_path2_acl *ptr) 847{ 848 int pos; 849 const u8 perm = ptr->perm; 850 u8 bit; 851 852 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 853 if (!(perm & (1 << bit))) 854 continue; 855 pos = head->read_avail; 856 if (!tomoyo_io_printf(head, "allow_%s ", 857 tomoyo_path22keyword(bit)) || 858 !tomoyo_print_name_union(head, &ptr->name1) || 859 !tomoyo_print_name_union(head, &ptr->name2) || 860 !tomoyo_io_printf(head, "\n")) 861 goto out; 862 } 863 head->read_bit = 0; 864 return true; 865 out: 866 head->read_bit = bit; 867 head->read_avail = pos; 868 return false; 869} 870 871/** 872 * tomoyo_print_path_number_acl - Print a path_number ACL entry. 873 * 874 * @head: Pointer to "struct tomoyo_io_buffer". 875 * @ptr: Pointer to "struct tomoyo_path_number_acl". 876 * 877 * Returns true on success, false otherwise. 878 */ 879static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head, 880 struct tomoyo_path_number_acl *ptr) 881{ 882 int pos; 883 u8 bit; 884 const u8 perm = ptr->perm; 885 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; 886 bit++) { 887 if (!(perm & (1 << bit))) 888 continue; 889 pos = head->read_avail; 890 if (!tomoyo_io_printf(head, "allow_%s", 891 tomoyo_path_number2keyword(bit)) || 892 !tomoyo_print_name_union(head, &ptr->name) || 893 !tomoyo_print_number_union(head, &ptr->number) || 894 !tomoyo_io_printf(head, "\n")) 895 goto out; 896 } 897 head->read_bit = 0; 898 return true; 899 out: 900 head->read_bit = bit; 901 head->read_avail = pos; 902 return false; 903} 904 905/** 906 * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry. 907 * 908 * @head: Pointer to "struct tomoyo_io_buffer". 909 * @ptr: Pointer to "struct tomoyo_path_number3_acl". 910 * 911 * Returns true on success, false otherwise. 912 */ 913static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head, 914 struct tomoyo_path_number3_acl *ptr) 915{ 916 int pos; 917 u8 bit; 918 const u16 perm = ptr->perm; 919 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION; 920 bit++) { 921 if (!(perm & (1 << bit))) 922 continue; 923 pos = head->read_avail; 924 if (!tomoyo_io_printf(head, "allow_%s", 925 tomoyo_path_number32keyword(bit)) || 926 !tomoyo_print_name_union(head, &ptr->name) || 927 !tomoyo_print_number_union(head, &ptr->mode) || 928 !tomoyo_print_number_union(head, &ptr->major) || 929 !tomoyo_print_number_union(head, &ptr->minor) || 930 !tomoyo_io_printf(head, "\n")) 931 goto out; 932 } 933 head->read_bit = 0; 934 return true; 935 out: 936 head->read_bit = bit; 937 head->read_avail = pos; 938 return false; 939} 940 941/** 942 * tomoyo_print_mount_acl - Print a mount ACL entry. 943 * 944 * @head: Pointer to "struct tomoyo_io_buffer". 945 * @ptr: Pointer to "struct tomoyo_mount_acl". 946 * 947 * Returns true on success, false otherwise. 948 */ 949static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head, 950 struct tomoyo_mount_acl *ptr) 951{ 952 const int pos = head->read_avail; 953 if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || 954 !tomoyo_print_name_union(head, &ptr->dev_name) || 955 !tomoyo_print_name_union(head, &ptr->dir_name) || 956 !tomoyo_print_name_union(head, &ptr->fs_type) || 957 !tomoyo_print_number_union(head, &ptr->flags) || 958 !tomoyo_io_printf(head, "\n")) { 959 head->read_avail = pos; 960 return false; 961 } 962 return true; 963} 964 965/** 966 * tomoyo_print_entry - Print an ACL entry. 967 * 968 * @head: Pointer to "struct tomoyo_io_buffer". 969 * @ptr: Pointer to an ACL entry. 970 * 971 * Returns true on success, false otherwise. 972 */ 973static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 974 struct tomoyo_acl_info *ptr) 975{ 976 const u8 acl_type = ptr->type; 977 978 if (ptr->is_deleted) 979 return true; 980 if (acl_type == TOMOYO_TYPE_PATH_ACL) { 981 struct tomoyo_path_acl *acl 982 = container_of(ptr, struct tomoyo_path_acl, head); 983 return tomoyo_print_path_acl(head, acl); 984 } 985 if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 986 struct tomoyo_path2_acl *acl 987 = container_of(ptr, struct tomoyo_path2_acl, head); 988 return tomoyo_print_path2_acl(head, acl); 989 } 990 if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 991 struct tomoyo_path_number_acl *acl 992 = container_of(ptr, struct tomoyo_path_number_acl, 993 head); 994 return tomoyo_print_path_number_acl(head, acl); 995 } 996 if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) { 997 struct tomoyo_path_number3_acl *acl 998 = container_of(ptr, struct tomoyo_path_number3_acl, 999 head); 1000 return tomoyo_print_path_number3_acl(head, acl); 1001 } 1002 if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 1003 struct tomoyo_mount_acl *acl 1004 = container_of(ptr, struct tomoyo_mount_acl, head); 1005 return tomoyo_print_mount_acl(head, acl); 1006 } 1007 BUG(); /* This must not happen. */ 1008 return false; 1009} 1010 1011/** 1012 * tomoyo_read_domain_policy - Read domain policy. 1013 * 1014 * @head: Pointer to "struct tomoyo_io_buffer". 1015 * 1016 * Returns 0. 1017 * 1018 * Caller holds tomoyo_read_lock(). 1019 */ 1020static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) 1021{ 1022 struct list_head *dpos; 1023 struct list_head *apos; 1024 bool done = true; 1025 1026 if (head->read_eof) 1027 return 0; 1028 if (head->read_step == 0) 1029 head->read_step = 1; 1030 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { 1031 struct tomoyo_domain_info *domain; 1032 const char *quota_exceeded = ""; 1033 const char *transition_failed = ""; 1034 const char *ignore_global_allow_read = ""; 1035 domain = list_entry(dpos, struct tomoyo_domain_info, list); 1036 if (head->read_step != 1) 1037 goto acl_loop; 1038 if (domain->is_deleted && !head->read_single_domain) 1039 continue; 1040 /* Print domainname and flags. */ 1041 if (domain->quota_warned) 1042 quota_exceeded = "quota_exceeded\n"; 1043 if (domain->transition_failed) 1044 transition_failed = "transition_failed\n"; 1045 if (domain->ignore_global_allow_read) 1046 ignore_global_allow_read 1047 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; 1048 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE 1049 "%u\n%s%s%s\n", 1050 domain->domainname->name, 1051 domain->profile, quota_exceeded, 1052 transition_failed, 1053 ignore_global_allow_read); 1054 if (!done) 1055 break; 1056 head->read_step = 2; 1057acl_loop: 1058 if (head->read_step == 3) 1059 goto tail_mark; 1060 /* Print ACL entries in the domain. */ 1061 list_for_each_cookie(apos, head->read_var2, 1062 &domain->acl_info_list) { 1063 struct tomoyo_acl_info *ptr 1064 = list_entry(apos, struct tomoyo_acl_info, 1065 list); 1066 done = tomoyo_print_entry(head, ptr); 1067 if (!done) 1068 break; 1069 } 1070 if (!done) 1071 break; 1072 head->read_step = 3; 1073tail_mark: 1074 done = tomoyo_io_printf(head, "\n"); 1075 if (!done) 1076 break; 1077 head->read_step = 1; 1078 if (head->read_single_domain) 1079 break; 1080 } 1081 head->read_eof = done; 1082 return 0; 1083} 1084 1085/** 1086 * tomoyo_write_domain_profile - Assign profile for specified domain. 1087 * 1088 * @head: Pointer to "struct tomoyo_io_buffer". 1089 * 1090 * Returns 0 on success, -EINVAL otherwise. 1091 * 1092 * This is equivalent to doing 1093 * 1094 * ( echo "select " $domainname; echo "use_profile " $profile ) | 1095 * /usr/sbin/tomoyo-loadpolicy -d 1096 * 1097 * Caller holds tomoyo_read_lock(). 1098 */ 1099static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) 1100{ 1101 char *data = head->write_buf; 1102 char *cp = strchr(data, ' '); 1103 struct tomoyo_domain_info *domain; 1104 unsigned long profile; 1105 1106 if (!cp) 1107 return -EINVAL; 1108 *cp = '\0'; 1109 domain = tomoyo_find_domain(cp + 1); 1110 if (strict_strtoul(data, 10, &profile)) 1111 return -EINVAL; 1112 if (domain && profile < TOMOYO_MAX_PROFILES 1113 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) 1114 domain->profile = (u8) profile; 1115 return 0; 1116} 1117 1118/** 1119 * tomoyo_read_domain_profile - Read only domainname and profile. 1120 * 1121 * @head: Pointer to "struct tomoyo_io_buffer". 1122 * 1123 * Returns list of profile number and domainname pairs. 1124 * 1125 * This is equivalent to doing 1126 * 1127 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | 1128 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) 1129 * domainname = $0; } else if ( $1 == "use_profile" ) { 1130 * print $2 " " domainname; domainname = ""; } } ; ' 1131 * 1132 * Caller holds tomoyo_read_lock(). 1133 */ 1134static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) 1135{ 1136 struct list_head *pos; 1137 bool done = true; 1138 1139 if (head->read_eof) 1140 return 0; 1141 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { 1142 struct tomoyo_domain_info *domain; 1143 domain = list_entry(pos, struct tomoyo_domain_info, list); 1144 if (domain->is_deleted) 1145 continue; 1146 done = tomoyo_io_printf(head, "%u %s\n", domain->profile, 1147 domain->domainname->name); 1148 if (!done) 1149 break; 1150 } 1151 head->read_eof = done; 1152 return 0; 1153} 1154 1155/** 1156 * tomoyo_write_pid: Specify PID to obtain domainname. 1157 * 1158 * @head: Pointer to "struct tomoyo_io_buffer". 1159 * 1160 * Returns 0. 1161 */ 1162static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1163{ 1164 unsigned long pid; 1165 /* No error check. */ 1166 strict_strtoul(head->write_buf, 10, &pid); 1167 head->read_step = (int) pid; 1168 head->read_eof = false; 1169 return 0; 1170} 1171 1172/** 1173 * tomoyo_read_pid - Get domainname of the specified PID. 1174 * 1175 * @head: Pointer to "struct tomoyo_io_buffer". 1176 * 1177 * Returns the domainname which the specified PID is in on success, 1178 * empty string otherwise. 1179 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1180 * using read()/write() interface rather than sysctl() interface. 1181 */ 1182static int tomoyo_read_pid(struct tomoyo_io_buffer *head) 1183{ 1184 if (head->read_avail == 0 && !head->read_eof) { 1185 const int pid = head->read_step; 1186 struct task_struct *p; 1187 struct tomoyo_domain_info *domain = NULL; 1188 rcu_read_lock(); 1189 read_lock(&tasklist_lock); 1190 p = find_task_by_vpid(pid); 1191 if (p) 1192 domain = tomoyo_real_domain(p); 1193 read_unlock(&tasklist_lock); 1194 rcu_read_unlock(); 1195 if (domain) 1196 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, 1197 domain->domainname->name); 1198 head->read_eof = true; 1199 } 1200 return 0; 1201} 1202 1203/** 1204 * tomoyo_write_exception_policy - Write exception policy. 1205 * 1206 * @head: Pointer to "struct tomoyo_io_buffer". 1207 * 1208 * Returns 0 on success, negative value otherwise. 1209 * 1210 * Caller holds tomoyo_read_lock(). 1211 */ 1212static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) 1213{ 1214 char *data = head->write_buf; 1215 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 1216 1217 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) 1218 return tomoyo_write_domain_keeper_policy(data, false, 1219 is_delete); 1220 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) 1221 return tomoyo_write_domain_keeper_policy(data, true, is_delete); 1222 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) 1223 return tomoyo_write_domain_initializer_policy(data, false, 1224 is_delete); 1225 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) 1226 return tomoyo_write_domain_initializer_policy(data, true, 1227 is_delete); 1228 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR)) 1229 return tomoyo_write_aggregator_policy(data, is_delete); 1230 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) 1231 return tomoyo_write_alias_policy(data, is_delete); 1232 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) 1233 return tomoyo_write_globally_readable_policy(data, is_delete); 1234 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) 1235 return tomoyo_write_pattern_policy(data, is_delete); 1236 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) 1237 return tomoyo_write_no_rewrite_policy(data, is_delete); 1238 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) 1239 return tomoyo_write_path_group_policy(data, is_delete); 1240 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) 1241 return tomoyo_write_number_group_policy(data, is_delete); 1242 return -EINVAL; 1243} 1244 1245/** 1246 * tomoyo_read_exception_policy - Read exception policy. 1247 * 1248 * @head: Pointer to "struct tomoyo_io_buffer". 1249 * 1250 * Returns 0 on success, -EINVAL otherwise. 1251 * 1252 * Caller holds tomoyo_read_lock(). 1253 */ 1254static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) 1255{ 1256 if (!head->read_eof) { 1257 switch (head->read_step) { 1258 case 0: 1259 head->read_var2 = NULL; 1260 head->read_step = 1; 1261 case 1: 1262 if (!tomoyo_read_domain_keeper_policy(head)) 1263 break; 1264 head->read_var2 = NULL; 1265 head->read_step = 2; 1266 case 2: 1267 if (!tomoyo_read_globally_readable_policy(head)) 1268 break; 1269 head->read_var2 = NULL; 1270 head->read_step = 3; 1271 case 3: 1272 head->read_var2 = NULL; 1273 head->read_step = 4; 1274 case 4: 1275 if (!tomoyo_read_domain_initializer_policy(head)) 1276 break; 1277 head->read_var2 = NULL; 1278 head->read_step = 5; 1279 case 5: 1280 if (!tomoyo_read_alias_policy(head)) 1281 break; 1282 head->read_var2 = NULL; 1283 head->read_step = 6; 1284 case 6: 1285 if (!tomoyo_read_aggregator_policy(head)) 1286 break; 1287 head->read_var2 = NULL; 1288 head->read_step = 7; 1289 case 7: 1290 if (!tomoyo_read_file_pattern(head)) 1291 break; 1292 head->read_var2 = NULL; 1293 head->read_step = 8; 1294 case 8: 1295 if (!tomoyo_read_no_rewrite_policy(head)) 1296 break; 1297 head->read_var2 = NULL; 1298 head->read_step = 9; 1299 case 9: 1300 if (!tomoyo_read_path_group_policy(head)) 1301 break; 1302 head->read_var1 = NULL; 1303 head->read_var2 = NULL; 1304 head->read_step = 10; 1305 case 10: 1306 if (!tomoyo_read_number_group_policy(head)) 1307 break; 1308 head->read_var1 = NULL; 1309 head->read_var2 = NULL; 1310 head->read_step = 11; 1311 case 11: 1312 head->read_eof = true; 1313 break; 1314 default: 1315 return -EINVAL; 1316 } 1317 } 1318 return 0; 1319} 1320 1321/** 1322 * tomoyo_print_header - Get header line of audit log. 1323 * 1324 * @r: Pointer to "struct tomoyo_request_info". 1325 * 1326 * Returns string representation. 1327 * 1328 * This function uses kmalloc(), so caller must kfree() if this function 1329 * didn't return NULL. 1330 */ 1331static char *tomoyo_print_header(struct tomoyo_request_info *r) 1332{ 1333 static const char *tomoyo_mode_4[4] = { 1334 "disabled", "learning", "permissive", "enforcing" 1335 }; 1336 struct timeval tv; 1337 const pid_t gpid = task_pid_nr(current); 1338 static const int tomoyo_buffer_len = 4096; 1339 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); 1340 if (!buffer) 1341 return NULL; 1342 do_gettimeofday(&tv); 1343 snprintf(buffer, tomoyo_buffer_len - 1, 1344 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" 1345 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" 1346 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", 1347 tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, 1348 (pid_t) sys_getpid(), (pid_t) sys_getppid(), 1349 current_uid(), current_gid(), current_euid(), 1350 current_egid(), current_suid(), current_sgid(), 1351 current_fsuid(), current_fsgid()); 1352 return buffer; 1353} 1354 1355/** 1356 * tomoyo_init_audit_log - Allocate buffer for audit logs. 1357 * 1358 * @len: Required size. 1359 * @r: Pointer to "struct tomoyo_request_info". 1360 * 1361 * Returns pointer to allocated memory. 1362 * 1363 * The @len is updated to add the header lines' size on success. 1364 * 1365 * This function uses kzalloc(), so caller must kfree() if this function 1366 * didn't return NULL. 1367 */ 1368static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) 1369{ 1370 char *buf = NULL; 1371 const char *header; 1372 const char *domainname; 1373 if (!r->domain) 1374 r->domain = tomoyo_domain(); 1375 domainname = r->domain->domainname->name; 1376 header = tomoyo_print_header(r); 1377 if (!header) 1378 return NULL; 1379 *len += strlen(domainname) + strlen(header) + 10; 1380 buf = kzalloc(*len, GFP_NOFS); 1381 if (buf) 1382 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); 1383 kfree(header); 1384 return buf; 1385} 1386 1387/* Wait queue for tomoyo_query_list. */ 1388static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1389 1390/* Lock for manipulating tomoyo_query_list. */ 1391static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1392 1393/* Structure for query. */ 1394struct tomoyo_query_entry { 1395 struct list_head list; 1396 char *query; 1397 int query_len; 1398 unsigned int serial; 1399 int timer; 1400 int answer; 1401}; 1402 1403/* The list for "struct tomoyo_query_entry". */ 1404static LIST_HEAD(tomoyo_query_list); 1405 1406/* 1407 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1408 * interface. 1409 */ 1410static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1411 1412/** 1413 * tomoyo_supervisor - Ask for the supervisor's decision. 1414 * 1415 * @r: Pointer to "struct tomoyo_request_info". 1416 * @fmt: The printf()'s format string, followed by parameters. 1417 * 1418 * Returns 0 if the supervisor decided to permit the access request which 1419 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 1420 * supervisor decided to retry the access request which violated the policy in 1421 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 1422 */ 1423int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 1424{ 1425 va_list args; 1426 int error = -EPERM; 1427 int pos; 1428 int len; 1429 static unsigned int tomoyo_serial; 1430 struct tomoyo_query_entry *tomoyo_query_entry = NULL; 1431 bool quota_exceeded = false; 1432 char *header; 1433 switch (r->mode) { 1434 char *buffer; 1435 case TOMOYO_CONFIG_LEARNING: 1436 if (!tomoyo_domain_quota_is_ok(r)) 1437 return 0; 1438 va_start(args, fmt); 1439 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; 1440 va_end(args); 1441 buffer = kmalloc(len, GFP_NOFS); 1442 if (!buffer) 1443 return 0; 1444 va_start(args, fmt); 1445 vsnprintf(buffer, len - 1, fmt, args); 1446 va_end(args); 1447 tomoyo_normalize_line(buffer); 1448 tomoyo_write_domain_policy2(buffer, r->domain, false); 1449 kfree(buffer); 1450 /* fall through */ 1451 case TOMOYO_CONFIG_PERMISSIVE: 1452 return 0; 1453 } 1454 if (!r->domain) 1455 r->domain = tomoyo_domain(); 1456 if (!atomic_read(&tomoyo_query_observers)) 1457 return -EPERM; 1458 va_start(args, fmt); 1459 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; 1460 va_end(args); 1461 header = tomoyo_init_audit_log(&len, r); 1462 if (!header) 1463 goto out; 1464 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); 1465 if (!tomoyo_query_entry) 1466 goto out; 1467 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); 1468 if (!tomoyo_query_entry->query) 1469 goto out; 1470 len = ksize(tomoyo_query_entry->query); 1471 INIT_LIST_HEAD(&tomoyo_query_entry->list); 1472 spin_lock(&tomoyo_query_list_lock); 1473 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + 1474 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { 1475 quota_exceeded = true; 1476 } else { 1477 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); 1478 tomoyo_query_entry->serial = tomoyo_serial++; 1479 } 1480 spin_unlock(&tomoyo_query_list_lock); 1481 if (quota_exceeded) 1482 goto out; 1483 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", 1484 tomoyo_query_entry->serial, r->retry, header); 1485 kfree(header); 1486 header = NULL; 1487 va_start(args, fmt); 1488 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); 1489 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; 1490 va_end(args); 1491 spin_lock(&tomoyo_query_list_lock); 1492 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); 1493 spin_unlock(&tomoyo_query_list_lock); 1494 /* Give 10 seconds for supervisor's opinion. */ 1495 for (tomoyo_query_entry->timer = 0; 1496 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; 1497 tomoyo_query_entry->timer++) { 1498 wake_up(&tomoyo_query_wait); 1499 set_current_state(TASK_INTERRUPTIBLE); 1500 schedule_timeout(HZ / 10); 1501 if (tomoyo_query_entry->answer) 1502 break; 1503 } 1504 spin_lock(&tomoyo_query_list_lock); 1505 list_del(&tomoyo_query_entry->list); 1506 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); 1507 spin_unlock(&tomoyo_query_list_lock); 1508 switch (tomoyo_query_entry->answer) { 1509 case 3: /* Asked to retry by administrator. */ 1510 error = TOMOYO_RETRY_REQUEST; 1511 r->retry++; 1512 break; 1513 case 1: 1514 /* Granted by administrator. */ 1515 error = 0; 1516 break; 1517 case 0: 1518 /* Timed out. */ 1519 break; 1520 default: 1521 /* Rejected by administrator. */ 1522 break; 1523 } 1524 out: 1525 if (tomoyo_query_entry) 1526 kfree(tomoyo_query_entry->query); 1527 kfree(tomoyo_query_entry); 1528 kfree(header); 1529 return error; 1530} 1531 1532/** 1533 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 1534 * 1535 * @file: Pointer to "struct file". 1536 * @wait: Pointer to "poll_table". 1537 * 1538 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 1539 * 1540 * Waits for access requests which violated policy in enforcing mode. 1541 */ 1542static int tomoyo_poll_query(struct file *file, poll_table *wait) 1543{ 1544 struct list_head *tmp; 1545 bool found = false; 1546 u8 i; 1547 for (i = 0; i < 2; i++) { 1548 spin_lock(&tomoyo_query_list_lock); 1549 list_for_each(tmp, &tomoyo_query_list) { 1550 struct tomoyo_query_entry *ptr 1551 = list_entry(tmp, struct tomoyo_query_entry, 1552 list); 1553 if (ptr->answer) 1554 continue; 1555 found = true; 1556 break; 1557 } 1558 spin_unlock(&tomoyo_query_list_lock); 1559 if (found) 1560 return POLLIN | POLLRDNORM; 1561 if (i) 1562 break; 1563 poll_wait(file, &tomoyo_query_wait, wait); 1564 } 1565 return 0; 1566} 1567 1568/** 1569 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 1570 * 1571 * @head: Pointer to "struct tomoyo_io_buffer". 1572 * 1573 * Returns 0. 1574 */ 1575static int tomoyo_read_query(struct tomoyo_io_buffer *head) 1576{ 1577 struct list_head *tmp; 1578 int pos = 0; 1579 int len = 0; 1580 char *buf; 1581 if (head->read_avail) 1582 return 0; 1583 if (head->read_buf) { 1584 kfree(head->read_buf); 1585 head->read_buf = NULL; 1586 head->readbuf_size = 0; 1587 } 1588 spin_lock(&tomoyo_query_list_lock); 1589 list_for_each(tmp, &tomoyo_query_list) { 1590 struct tomoyo_query_entry *ptr 1591 = list_entry(tmp, struct tomoyo_query_entry, list); 1592 if (ptr->answer) 1593 continue; 1594 if (pos++ != head->read_step) 1595 continue; 1596 len = ptr->query_len; 1597 break; 1598 } 1599 spin_unlock(&tomoyo_query_list_lock); 1600 if (!len) { 1601 head->read_step = 0; 1602 return 0; 1603 } 1604 buf = kzalloc(len, GFP_NOFS); 1605 if (!buf) 1606 return 0; 1607 pos = 0; 1608 spin_lock(&tomoyo_query_list_lock); 1609 list_for_each(tmp, &tomoyo_query_list) { 1610 struct tomoyo_query_entry *ptr 1611 = list_entry(tmp, struct tomoyo_query_entry, list); 1612 if (ptr->answer) 1613 continue; 1614 if (pos++ != head->read_step) 1615 continue; 1616 /* 1617 * Some query can be skipped because tomoyo_query_list 1618 * can change, but I don't care. 1619 */ 1620 if (len == ptr->query_len) 1621 memmove(buf, ptr->query, len); 1622 break; 1623 } 1624 spin_unlock(&tomoyo_query_list_lock); 1625 if (buf[0]) { 1626 head->read_avail = len; 1627 head->readbuf_size = head->read_avail; 1628 head->read_buf = buf; 1629 head->read_step++; 1630 } else { 1631 kfree(buf); 1632 } 1633 return 0; 1634} 1635 1636/** 1637 * tomoyo_write_answer - Write the supervisor's decision. 1638 * 1639 * @head: Pointer to "struct tomoyo_io_buffer". 1640 * 1641 * Returns 0 on success, -EINVAL otherwise. 1642 */ 1643static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 1644{ 1645 char *data = head->write_buf; 1646 struct list_head *tmp; 1647 unsigned int serial; 1648 unsigned int answer; 1649 spin_lock(&tomoyo_query_list_lock); 1650 list_for_each(tmp, &tomoyo_query_list) { 1651 struct tomoyo_query_entry *ptr 1652 = list_entry(tmp, struct tomoyo_query_entry, list); 1653 ptr->timer = 0; 1654 } 1655 spin_unlock(&tomoyo_query_list_lock); 1656 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 1657 return -EINVAL; 1658 spin_lock(&tomoyo_query_list_lock); 1659 list_for_each(tmp, &tomoyo_query_list) { 1660 struct tomoyo_query_entry *ptr 1661 = list_entry(tmp, struct tomoyo_query_entry, list); 1662 if (ptr->serial != serial) 1663 continue; 1664 if (!ptr->answer) 1665 ptr->answer = answer; 1666 break; 1667 } 1668 spin_unlock(&tomoyo_query_list_lock); 1669 return 0; 1670} 1671 1672/** 1673 * tomoyo_read_version: Get version. 1674 * 1675 * @head: Pointer to "struct tomoyo_io_buffer". 1676 * 1677 * Returns version information. 1678 */ 1679static int tomoyo_read_version(struct tomoyo_io_buffer *head) 1680{ 1681 if (!head->read_eof) { 1682 tomoyo_io_printf(head, "2.3.0-pre"); 1683 head->read_eof = true; 1684 } 1685 return 0; 1686} 1687 1688/** 1689 * tomoyo_read_self_domain - Get the current process's domainname. 1690 * 1691 * @head: Pointer to "struct tomoyo_io_buffer". 1692 * 1693 * Returns the current process's domainname. 1694 */ 1695static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) 1696{ 1697 if (!head->read_eof) { 1698 /* 1699 * tomoyo_domain()->domainname != NULL 1700 * because every process belongs to a domain and 1701 * the domain's name cannot be NULL. 1702 */ 1703 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); 1704 head->read_eof = true; 1705 } 1706 return 0; 1707} 1708 1709/** 1710 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 1711 * 1712 * @type: Type of interface. 1713 * @file: Pointer to "struct file". 1714 * 1715 * Associates policy handler and returns 0 on success, -ENOMEM otherwise. 1716 * 1717 * Caller acquires tomoyo_read_lock(). 1718 */ 1719int tomoyo_open_control(const u8 type, struct file *file) 1720{ 1721 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 1722 1723 if (!head) 1724 return -ENOMEM; 1725 mutex_init(&head->io_sem); 1726 head->type = type; 1727 switch (type) { 1728 case TOMOYO_DOMAINPOLICY: 1729 /* /sys/kernel/security/tomoyo/domain_policy */ 1730 head->write = tomoyo_write_domain_policy; 1731 head->read = tomoyo_read_domain_policy; 1732 break; 1733 case TOMOYO_EXCEPTIONPOLICY: 1734 /* /sys/kernel/security/tomoyo/exception_policy */ 1735 head->write = tomoyo_write_exception_policy; 1736 head->read = tomoyo_read_exception_policy; 1737 break; 1738 case TOMOYO_SELFDOMAIN: 1739 /* /sys/kernel/security/tomoyo/self_domain */ 1740 head->read = tomoyo_read_self_domain; 1741 break; 1742 case TOMOYO_DOMAIN_STATUS: 1743 /* /sys/kernel/security/tomoyo/.domain_status */ 1744 head->write = tomoyo_write_domain_profile; 1745 head->read = tomoyo_read_domain_profile; 1746 break; 1747 case TOMOYO_PROCESS_STATUS: 1748 /* /sys/kernel/security/tomoyo/.process_status */ 1749 head->write = tomoyo_write_pid; 1750 head->read = tomoyo_read_pid; 1751 break; 1752 case TOMOYO_VERSION: 1753 /* /sys/kernel/security/tomoyo/version */ 1754 head->read = tomoyo_read_version; 1755 head->readbuf_size = 128; 1756 break; 1757 case TOMOYO_MEMINFO: 1758 /* /sys/kernel/security/tomoyo/meminfo */ 1759 head->write = tomoyo_write_memory_quota; 1760 head->read = tomoyo_read_memory_counter; 1761 head->readbuf_size = 512; 1762 break; 1763 case TOMOYO_PROFILE: 1764 /* /sys/kernel/security/tomoyo/profile */ 1765 head->write = tomoyo_write_profile; 1766 head->read = tomoyo_read_profile; 1767 break; 1768 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 1769 head->poll = tomoyo_poll_query; 1770 head->write = tomoyo_write_answer; 1771 head->read = tomoyo_read_query; 1772 break; 1773 case TOMOYO_MANAGER: 1774 /* /sys/kernel/security/tomoyo/manager */ 1775 head->write = tomoyo_write_manager_policy; 1776 head->read = tomoyo_read_manager_policy; 1777 break; 1778 } 1779 if (!(file->f_mode & FMODE_READ)) { 1780 /* 1781 * No need to allocate read_buf since it is not opened 1782 * for reading. 1783 */ 1784 head->read = NULL; 1785 head->poll = NULL; 1786 } else if (!head->poll) { 1787 /* Don't allocate read_buf for poll() access. */ 1788 if (!head->readbuf_size) 1789 head->readbuf_size = 4096 * 2; 1790 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 1791 if (!head->read_buf) { 1792 kfree(head); 1793 return -ENOMEM; 1794 } 1795 } 1796 if (!(file->f_mode & FMODE_WRITE)) { 1797 /* 1798 * No need to allocate write_buf since it is not opened 1799 * for writing. 1800 */ 1801 head->write = NULL; 1802 } else if (head->write) { 1803 head->writebuf_size = 4096 * 2; 1804 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 1805 if (!head->write_buf) { 1806 kfree(head->read_buf); 1807 kfree(head); 1808 return -ENOMEM; 1809 } 1810 } 1811 if (type != TOMOYO_QUERY) 1812 head->reader_idx = tomoyo_read_lock(); 1813 file->private_data = head; 1814 /* 1815 * Call the handler now if the file is 1816 * /sys/kernel/security/tomoyo/self_domain 1817 * so that the user can use 1818 * cat < /sys/kernel/security/tomoyo/self_domain" 1819 * to know the current process's domainname. 1820 */ 1821 if (type == TOMOYO_SELFDOMAIN) 1822 tomoyo_read_control(file, NULL, 0); 1823 /* 1824 * If the file is /sys/kernel/security/tomoyo/query , increment the 1825 * observer counter. 1826 * The obserber counter is used by tomoyo_supervisor() to see if 1827 * there is some process monitoring /sys/kernel/security/tomoyo/query. 1828 */ 1829 else if (type == TOMOYO_QUERY) 1830 atomic_inc(&tomoyo_query_observers); 1831 return 0; 1832} 1833 1834/** 1835 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 1836 * 1837 * @file: Pointer to "struct file". 1838 * @wait: Pointer to "poll_table". 1839 * 1840 * Waits for read readiness. 1841 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . 1842 */ 1843int tomoyo_poll_control(struct file *file, poll_table *wait) 1844{ 1845 struct tomoyo_io_buffer *head = file->private_data; 1846 if (!head->poll) 1847 return -ENOSYS; 1848 return head->poll(file, wait); 1849} 1850 1851/** 1852 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 1853 * 1854 * @file: Pointer to "struct file". 1855 * @buffer: Poiner to buffer to write to. 1856 * @buffer_len: Size of @buffer. 1857 * 1858 * Returns bytes read on success, negative value otherwise. 1859 * 1860 * Caller holds tomoyo_read_lock(). 1861 */ 1862int tomoyo_read_control(struct file *file, char __user *buffer, 1863 const int buffer_len) 1864{ 1865 int len = 0; 1866 struct tomoyo_io_buffer *head = file->private_data; 1867 char *cp; 1868 1869 if (!head->read) 1870 return -ENOSYS; 1871 if (mutex_lock_interruptible(&head->io_sem)) 1872 return -EINTR; 1873 /* Call the policy handler. */ 1874 len = head->read(head); 1875 if (len < 0) 1876 goto out; 1877 /* Write to buffer. */ 1878 len = head->read_avail; 1879 if (len > buffer_len) 1880 len = buffer_len; 1881 if (!len) 1882 goto out; 1883 /* head->read_buf changes by some functions. */ 1884 cp = head->read_buf; 1885 if (copy_to_user(buffer, cp, len)) { 1886 len = -EFAULT; 1887 goto out; 1888 } 1889 head->read_avail -= len; 1890 memmove(cp, cp + len, head->read_avail); 1891 out: 1892 mutex_unlock(&head->io_sem); 1893 return len; 1894} 1895 1896/** 1897 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 1898 * 1899 * @file: Pointer to "struct file". 1900 * @buffer: Pointer to buffer to read from. 1901 * @buffer_len: Size of @buffer. 1902 * 1903 * Returns @buffer_len on success, negative value otherwise. 1904 * 1905 * Caller holds tomoyo_read_lock(). 1906 */ 1907int tomoyo_write_control(struct file *file, const char __user *buffer, 1908 const int buffer_len) 1909{ 1910 struct tomoyo_io_buffer *head = file->private_data; 1911 int error = buffer_len; 1912 int avail_len = buffer_len; 1913 char *cp0 = head->write_buf; 1914 1915 if (!head->write) 1916 return -ENOSYS; 1917 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 1918 return -EFAULT; 1919 /* Don't allow updating policies by non manager programs. */ 1920 if (head->write != tomoyo_write_pid && 1921 head->write != tomoyo_write_domain_policy && 1922 !tomoyo_is_policy_manager()) 1923 return -EPERM; 1924 if (mutex_lock_interruptible(&head->io_sem)) 1925 return -EINTR; 1926 /* Read a line and dispatch it to the policy handler. */ 1927 while (avail_len > 0) { 1928 char c; 1929 if (head->write_avail >= head->writebuf_size - 1) { 1930 error = -ENOMEM; 1931 break; 1932 } else if (get_user(c, buffer)) { 1933 error = -EFAULT; 1934 break; 1935 } 1936 buffer++; 1937 avail_len--; 1938 cp0[head->write_avail++] = c; 1939 if (c != '\n') 1940 continue; 1941 cp0[head->write_avail - 1] = '\0'; 1942 head->write_avail = 0; 1943 tomoyo_normalize_line(cp0); 1944 head->write(head); 1945 } 1946 mutex_unlock(&head->io_sem); 1947 return error; 1948} 1949 1950/** 1951 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 1952 * 1953 * @file: Pointer to "struct file". 1954 * 1955 * Releases memory and returns 0. 1956 * 1957 * Caller looses tomoyo_read_lock(). 1958 */ 1959int tomoyo_close_control(struct file *file) 1960{ 1961 struct tomoyo_io_buffer *head = file->private_data; 1962 const bool is_write = !!head->write_buf; 1963 1964 /* 1965 * If the file is /sys/kernel/security/tomoyo/query , decrement the 1966 * observer counter. 1967 */ 1968 if (head->type == TOMOYO_QUERY) 1969 atomic_dec(&tomoyo_query_observers); 1970 else 1971 tomoyo_read_unlock(head->reader_idx); 1972 /* Release memory used for policy I/O. */ 1973 kfree(head->read_buf); 1974 head->read_buf = NULL; 1975 kfree(head->write_buf); 1976 head->write_buf = NULL; 1977 kfree(head); 1978 head = NULL; 1979 file->private_data = NULL; 1980 if (is_write) 1981 tomoyo_run_gc(); 1982 return 0; 1983} 1984 1985/** 1986 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 1987 */ 1988void tomoyo_check_profile(void) 1989{ 1990 struct tomoyo_domain_info *domain; 1991 const int idx = tomoyo_read_lock(); 1992 tomoyo_policy_loaded = true; 1993 /* Check all profiles currently assigned to domains are defined. */ 1994 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 1995 const u8 profile = domain->profile; 1996 if (tomoyo_profile_ptr[profile]) 1997 continue; 1998 panic("Profile %u (used by '%s') not defined.\n", 1999 profile, domain->domainname->name); 2000 } 2001 tomoyo_read_unlock(idx); 2002 if (tomoyo_profile_version != 20090903) 2003 panic("Profile version %u is not supported.\n", 2004 tomoyo_profile_version); 2005 printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n"); 2006 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2007} 2008