common.c revision 475e6fa3d340e75a454ea09191a29e52e2ee6e71
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 */ 356static void tomoyo_read_profile(struct tomoyo_io_buffer *head) 357{ 358 int index; 359 if (head->read_eof) 360 return; 361 if (head->read_bit) 362 goto body; 363 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903"); 364 tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s " 365 "max_entry=%u }\n", 366 tomoyo_yesno(tomoyo_default_profile.preference. 367 learning_verbose), 368 tomoyo_default_profile.preference.learning_max_entry); 369 tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n", 370 tomoyo_yesno(tomoyo_default_profile.preference. 371 permissive_verbose)); 372 tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s }\n", 373 tomoyo_yesno(tomoyo_default_profile.preference. 374 enforcing_verbose)); 375 head->read_bit = 1; 376 body: 377 for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) { 378 bool done; 379 u8 config; 380 int i; 381 int pos; 382 const struct tomoyo_profile *profile 383 = tomoyo_profile_ptr[index]; 384 const struct tomoyo_path_info *comment; 385 head->read_step = index; 386 if (!profile) 387 continue; 388 pos = head->read_avail; 389 comment = profile->comment; 390 done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index, 391 comment ? comment->name : ""); 392 if (!done) 393 goto out; 394 config = profile->default_config; 395 if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index, 396 tomoyo_mode_4[config & 3])) 397 goto out; 398 for (i = 0; i < TOMOYO_MAX_MAC_INDEX + 399 TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { 400 config = profile->config[i]; 401 if (config == TOMOYO_CONFIG_USE_DEFAULT) 402 continue; 403 if (!tomoyo_io_printf(head, 404 "%u-CONFIG::%s={ mode=%s }\n", 405 index, tomoyo_mac_keywords[i], 406 tomoyo_mode_4[config & 3])) 407 goto out; 408 } 409 if (profile->learning != &tomoyo_default_profile.preference && 410 !tomoyo_io_printf(head, "%u-PREFERENCE::learning={ " 411 "verbose=%s max_entry=%u }\n", index, 412 tomoyo_yesno(profile->preference. 413 learning_verbose), 414 profile->preference.learning_max_entry)) 415 goto out; 416 if (profile->permissive != &tomoyo_default_profile.preference 417 && !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ " 418 "verbose=%s }\n", index, 419 tomoyo_yesno(profile->preference. 420 permissive_verbose))) 421 goto out; 422 if (profile->enforcing != &tomoyo_default_profile.preference && 423 !tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ " 424 "verbose=%s }\n", index, 425 tomoyo_yesno(profile->preference. 426 enforcing_verbose))) 427 goto out; 428 continue; 429 out: 430 head->read_avail = pos; 431 break; 432 } 433 if (index == TOMOYO_MAX_PROFILES) 434 head->read_eof = true; 435} 436 437static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a, 438 const struct tomoyo_acl_head *b) 439{ 440 return container_of(a, struct tomoyo_policy_manager_entry, head) 441 ->manager == 442 container_of(b, struct tomoyo_policy_manager_entry, head) 443 ->manager; 444} 445 446/** 447 * tomoyo_update_manager_entry - Add a manager entry. 448 * 449 * @manager: The path to manager or the domainnamme. 450 * @is_delete: True if it is a delete request. 451 * 452 * Returns 0 on success, negative value otherwise. 453 * 454 * Caller holds tomoyo_read_lock(). 455 */ 456static int tomoyo_update_manager_entry(const char *manager, 457 const bool is_delete) 458{ 459 struct tomoyo_policy_manager_entry e = { }; 460 int error; 461 462 if (tomoyo_domain_def(manager)) { 463 if (!tomoyo_correct_domain(manager)) 464 return -EINVAL; 465 e.is_domain = true; 466 } else { 467 if (!tomoyo_correct_path(manager)) 468 return -EINVAL; 469 } 470 e.manager = tomoyo_get_name(manager); 471 if (!e.manager) 472 return -ENOMEM; 473 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, 474 &tomoyo_policy_list[TOMOYO_ID_MANAGER], 475 tomoyo_same_manager_entry); 476 tomoyo_put_name(e.manager); 477 return error; 478} 479 480/** 481 * tomoyo_write_manager_policy - Write manager policy. 482 * 483 * @head: Pointer to "struct tomoyo_io_buffer". 484 * 485 * Returns 0 on success, negative value otherwise. 486 * 487 * Caller holds tomoyo_read_lock(). 488 */ 489static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) 490{ 491 char *data = head->write_buf; 492 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 493 494 if (!strcmp(data, "manage_by_non_root")) { 495 tomoyo_manage_by_non_root = !is_delete; 496 return 0; 497 } 498 return tomoyo_update_manager_entry(data, is_delete); 499} 500 501/** 502 * tomoyo_read_manager_policy - Read manager policy. 503 * 504 * @head: Pointer to "struct tomoyo_io_buffer". 505 * 506 * Caller holds tomoyo_read_lock(). 507 */ 508static void tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) 509{ 510 bool done = true; 511 512 if (head->read_eof) 513 return; 514 list_for_each_cookie(head->read_var2, 515 &tomoyo_policy_list[TOMOYO_ID_MANAGER]) { 516 struct tomoyo_policy_manager_entry *ptr = 517 list_entry(head->read_var2, typeof(*ptr), head.list); 518 if (ptr->head.is_deleted) 519 continue; 520 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); 521 if (!done) 522 break; 523 } 524 head->read_eof = done; 525} 526 527/** 528 * tomoyo_policy_manager - Check whether the current process is a policy manager. 529 * 530 * Returns true if the current process is permitted to modify policy 531 * via /sys/kernel/security/tomoyo/ interface. 532 * 533 * Caller holds tomoyo_read_lock(). 534 */ 535static bool tomoyo_policy_manager(void) 536{ 537 struct tomoyo_policy_manager_entry *ptr; 538 const char *exe; 539 const struct task_struct *task = current; 540 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; 541 bool found = false; 542 543 if (!tomoyo_policy_loaded) 544 return true; 545 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) 546 return false; 547 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER], 548 head.list) { 549 if (!ptr->head.is_deleted && ptr->is_domain 550 && !tomoyo_pathcmp(domainname, ptr->manager)) { 551 found = true; 552 break; 553 } 554 } 555 if (found) 556 return true; 557 exe = tomoyo_get_exe(); 558 if (!exe) 559 return false; 560 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER], 561 head.list) { 562 if (!ptr->head.is_deleted && !ptr->is_domain 563 && !strcmp(exe, ptr->manager->name)) { 564 found = true; 565 break; 566 } 567 } 568 if (!found) { /* Reduce error messages. */ 569 static pid_t last_pid; 570 const pid_t pid = current->pid; 571 if (last_pid != pid) { 572 printk(KERN_WARNING "%s ( %s ) is not permitted to " 573 "update policies.\n", domainname->name, exe); 574 last_pid = pid; 575 } 576 } 577 kfree(exe); 578 return found; 579} 580 581/** 582 * tomoyo_select_one - Parse select command. 583 * 584 * @head: Pointer to "struct tomoyo_io_buffer". 585 * @data: String to parse. 586 * 587 * Returns true on success, false otherwise. 588 * 589 * Caller holds tomoyo_read_lock(). 590 */ 591static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data) 592{ 593 unsigned int pid; 594 struct tomoyo_domain_info *domain = NULL; 595 bool global_pid = false; 596 597 if (sscanf(data, "pid=%u", &pid) == 1 || 598 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 599 struct task_struct *p; 600 rcu_read_lock(); 601 read_lock(&tasklist_lock); 602 if (global_pid) 603 p = find_task_by_pid_ns(pid, &init_pid_ns); 604 else 605 p = find_task_by_vpid(pid); 606 if (p) 607 domain = tomoyo_real_domain(p); 608 read_unlock(&tasklist_lock); 609 rcu_read_unlock(); 610 } else if (!strncmp(data, "domain=", 7)) { 611 if (tomoyo_domain_def(data + 7)) 612 domain = tomoyo_find_domain(data + 7); 613 } else 614 return false; 615 head->write_var1 = domain; 616 /* Accessing read_buf is safe because head->io_sem is held. */ 617 if (!head->read_buf) 618 return true; /* Do nothing if open(O_WRONLY). */ 619 head->read_avail = 0; 620 tomoyo_io_printf(head, "# select %s\n", data); 621 head->read_single_domain = true; 622 head->read_eof = !domain; 623 head->read_var1 = &domain->list; 624 head->read_var2 = NULL; 625 head->read_bit = 0; 626 head->read_step = 0; 627 if (domain && domain->is_deleted) 628 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 629 return true; 630} 631 632/** 633 * tomoyo_delete_domain - Delete a domain. 634 * 635 * @domainname: The name of domain. 636 * 637 * Returns 0. 638 * 639 * Caller holds tomoyo_read_lock(). 640 */ 641static int tomoyo_delete_domain(char *domainname) 642{ 643 struct tomoyo_domain_info *domain; 644 struct tomoyo_path_info name; 645 646 name.name = domainname; 647 tomoyo_fill_path_info(&name); 648 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 649 return 0; 650 /* Is there an active domain? */ 651 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 652 /* Never delete tomoyo_kernel_domain */ 653 if (domain == &tomoyo_kernel_domain) 654 continue; 655 if (domain->is_deleted || 656 tomoyo_pathcmp(domain->domainname, &name)) 657 continue; 658 domain->is_deleted = true; 659 break; 660 } 661 mutex_unlock(&tomoyo_policy_lock); 662 return 0; 663} 664 665/** 666 * tomoyo_write_domain_policy2 - Write domain policy. 667 * 668 * @head: Pointer to "struct tomoyo_io_buffer". 669 * 670 * Returns 0 on success, negative value otherwise. 671 * 672 * Caller holds tomoyo_read_lock(). 673 */ 674static int tomoyo_write_domain_policy2(char *data, 675 struct tomoyo_domain_info *domain, 676 const bool is_delete) 677{ 678 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) 679 return tomoyo_write_mount_policy(data, domain, is_delete); 680 return tomoyo_write_file_policy(data, domain, is_delete); 681} 682 683/** 684 * tomoyo_write_domain_policy - Write domain policy. 685 * 686 * @head: Pointer to "struct tomoyo_io_buffer". 687 * 688 * Returns 0 on success, negative value otherwise. 689 * 690 * Caller holds tomoyo_read_lock(). 691 */ 692static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) 693{ 694 char *data = head->write_buf; 695 struct tomoyo_domain_info *domain = head->write_var1; 696 bool is_delete = false; 697 bool is_select = false; 698 unsigned int profile; 699 700 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) 701 is_delete = true; 702 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) 703 is_select = true; 704 if (is_select && tomoyo_select_one(head, data)) 705 return 0; 706 /* Don't allow updating policies by non manager programs. */ 707 if (!tomoyo_policy_manager()) 708 return -EPERM; 709 if (tomoyo_domain_def(data)) { 710 domain = NULL; 711 if (is_delete) 712 tomoyo_delete_domain(data); 713 else if (is_select) 714 domain = tomoyo_find_domain(data); 715 else 716 domain = tomoyo_find_or_assign_new_domain(data, 0); 717 head->write_var1 = domain; 718 return 0; 719 } 720 if (!domain) 721 return -EINVAL; 722 723 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 724 && profile < TOMOYO_MAX_PROFILES) { 725 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) 726 domain->profile = (u8) profile; 727 return 0; 728 } 729 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { 730 domain->ignore_global_allow_read = !is_delete; 731 return 0; 732 } 733 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { 734 domain->quota_warned = !is_delete; 735 return 0; 736 } 737 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { 738 domain->transition_failed = !is_delete; 739 return 0; 740 } 741 return tomoyo_write_domain_policy2(data, domain, is_delete); 742} 743 744/** 745 * tomoyo_print_path_acl - Print a single path ACL entry. 746 * 747 * @head: Pointer to "struct tomoyo_io_buffer". 748 * @ptr: Pointer to "struct tomoyo_path_acl". 749 * 750 * Returns true on success, false otherwise. 751 */ 752static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, 753 struct tomoyo_path_acl *ptr) 754{ 755 int pos; 756 u8 bit; 757 const u16 perm = ptr->perm; 758 759 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 760 if (!(perm & (1 << bit))) 761 continue; 762 /* Print "read/write" instead of "read" and "write". */ 763 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) 764 && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) 765 continue; 766 pos = head->read_avail; 767 if (!tomoyo_io_printf(head, "allow_%s ", 768 tomoyo_path_keyword[bit]) || 769 !tomoyo_print_name_union(head, &ptr->name) || 770 !tomoyo_io_printf(head, "\n")) 771 goto out; 772 } 773 head->read_bit = 0; 774 return true; 775 out: 776 head->read_bit = bit; 777 head->read_avail = pos; 778 return false; 779} 780 781/** 782 * tomoyo_print_path2_acl - Print a double path ACL entry. 783 * 784 * @head: Pointer to "struct tomoyo_io_buffer". 785 * @ptr: Pointer to "struct tomoyo_path2_acl". 786 * 787 * Returns true on success, false otherwise. 788 */ 789static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, 790 struct tomoyo_path2_acl *ptr) 791{ 792 int pos; 793 const u8 perm = ptr->perm; 794 u8 bit; 795 796 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 797 if (!(perm & (1 << bit))) 798 continue; 799 pos = head->read_avail; 800 if (!tomoyo_io_printf(head, "allow_%s ", 801 tomoyo_path2_keyword[bit]) || 802 !tomoyo_print_name_union(head, &ptr->name1) || 803 !tomoyo_print_name_union(head, &ptr->name2) || 804 !tomoyo_io_printf(head, "\n")) 805 goto out; 806 } 807 head->read_bit = 0; 808 return true; 809 out: 810 head->read_bit = bit; 811 head->read_avail = pos; 812 return false; 813} 814 815/** 816 * tomoyo_print_path_number_acl - Print a path_number ACL entry. 817 * 818 * @head: Pointer to "struct tomoyo_io_buffer". 819 * @ptr: Pointer to "struct tomoyo_path_number_acl". 820 * 821 * Returns true on success, false otherwise. 822 */ 823static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head, 824 struct tomoyo_path_number_acl *ptr) 825{ 826 int pos; 827 u8 bit; 828 const u8 perm = ptr->perm; 829 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; 830 bit++) { 831 if (!(perm & (1 << bit))) 832 continue; 833 pos = head->read_avail; 834 if (!tomoyo_io_printf(head, "allow_%s", 835 tomoyo_path_number_keyword[bit]) || 836 !tomoyo_print_name_union(head, &ptr->name) || 837 !tomoyo_print_number_union(head, &ptr->number) || 838 !tomoyo_io_printf(head, "\n")) 839 goto out; 840 } 841 head->read_bit = 0; 842 return true; 843 out: 844 head->read_bit = bit; 845 head->read_avail = pos; 846 return false; 847} 848 849/** 850 * tomoyo_print_mkdev_acl - Print a mkdev ACL entry. 851 * 852 * @head: Pointer to "struct tomoyo_io_buffer". 853 * @ptr: Pointer to "struct tomoyo_mkdev_acl". 854 * 855 * Returns true on success, false otherwise. 856 */ 857static bool tomoyo_print_mkdev_acl(struct tomoyo_io_buffer *head, 858 struct tomoyo_mkdev_acl *ptr) 859{ 860 int pos; 861 u8 bit; 862 const u16 perm = ptr->perm; 863 for (bit = head->read_bit; bit < TOMOYO_MAX_MKDEV_OPERATION; 864 bit++) { 865 if (!(perm & (1 << bit))) 866 continue; 867 pos = head->read_avail; 868 if (!tomoyo_io_printf(head, "allow_%s", 869 tomoyo_mkdev_keyword[bit]) || 870 !tomoyo_print_name_union(head, &ptr->name) || 871 !tomoyo_print_number_union(head, &ptr->mode) || 872 !tomoyo_print_number_union(head, &ptr->major) || 873 !tomoyo_print_number_union(head, &ptr->minor) || 874 !tomoyo_io_printf(head, "\n")) 875 goto out; 876 } 877 head->read_bit = 0; 878 return true; 879 out: 880 head->read_bit = bit; 881 head->read_avail = pos; 882 return false; 883} 884 885/** 886 * tomoyo_print_mount_acl - Print a mount ACL entry. 887 * 888 * @head: Pointer to "struct tomoyo_io_buffer". 889 * @ptr: Pointer to "struct tomoyo_mount_acl". 890 * 891 * Returns true on success, false otherwise. 892 */ 893static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head, 894 struct tomoyo_mount_acl *ptr) 895{ 896 const int pos = head->read_avail; 897 if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || 898 !tomoyo_print_name_union(head, &ptr->dev_name) || 899 !tomoyo_print_name_union(head, &ptr->dir_name) || 900 !tomoyo_print_name_union(head, &ptr->fs_type) || 901 !tomoyo_print_number_union(head, &ptr->flags) || 902 !tomoyo_io_printf(head, "\n")) { 903 head->read_avail = pos; 904 return false; 905 } 906 return true; 907} 908 909/** 910 * tomoyo_print_entry - Print an ACL entry. 911 * 912 * @head: Pointer to "struct tomoyo_io_buffer". 913 * @ptr: Pointer to an ACL entry. 914 * 915 * Returns true on success, false otherwise. 916 */ 917static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 918 struct tomoyo_acl_info *ptr) 919{ 920 const u8 acl_type = ptr->type; 921 922 if (ptr->is_deleted) 923 return true; 924 if (acl_type == TOMOYO_TYPE_PATH_ACL) { 925 struct tomoyo_path_acl *acl 926 = container_of(ptr, struct tomoyo_path_acl, head); 927 return tomoyo_print_path_acl(head, acl); 928 } 929 if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 930 struct tomoyo_path2_acl *acl 931 = container_of(ptr, struct tomoyo_path2_acl, head); 932 return tomoyo_print_path2_acl(head, acl); 933 } 934 if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 935 struct tomoyo_path_number_acl *acl 936 = container_of(ptr, struct tomoyo_path_number_acl, 937 head); 938 return tomoyo_print_path_number_acl(head, acl); 939 } 940 if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 941 struct tomoyo_mkdev_acl *acl 942 = container_of(ptr, struct tomoyo_mkdev_acl, 943 head); 944 return tomoyo_print_mkdev_acl(head, acl); 945 } 946 if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 947 struct tomoyo_mount_acl *acl 948 = container_of(ptr, struct tomoyo_mount_acl, head); 949 return tomoyo_print_mount_acl(head, acl); 950 } 951 BUG(); /* This must not happen. */ 952 return false; 953} 954 955/** 956 * tomoyo_read_domain_policy - Read domain policy. 957 * 958 * @head: Pointer to "struct tomoyo_io_buffer". 959 * 960 * Caller holds tomoyo_read_lock(). 961 */ 962static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) 963{ 964 bool done = true; 965 966 if (head->read_eof) 967 return; 968 if (head->read_step == 0) 969 head->read_step = 1; 970 list_for_each_cookie(head->read_var1, &tomoyo_domain_list) { 971 struct tomoyo_domain_info *domain = 972 list_entry(head->read_var1, typeof(*domain), list); 973 const char *quota_exceeded = ""; 974 const char *transition_failed = ""; 975 const char *ignore_global_allow_read = ""; 976 if (head->read_step != 1) 977 goto acl_loop; 978 if (domain->is_deleted && !head->read_single_domain) 979 continue; 980 /* Print domainname and flags. */ 981 if (domain->quota_warned) 982 quota_exceeded = "quota_exceeded\n"; 983 if (domain->transition_failed) 984 transition_failed = "transition_failed\n"; 985 if (domain->ignore_global_allow_read) 986 ignore_global_allow_read 987 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; 988 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE 989 "%u\n%s%s%s\n", 990 domain->domainname->name, 991 domain->profile, quota_exceeded, 992 transition_failed, 993 ignore_global_allow_read); 994 if (!done) 995 break; 996 head->read_step = 2; 997acl_loop: 998 if (head->read_step == 3) 999 goto tail_mark; 1000 /* Print ACL entries in the domain. */ 1001 list_for_each_cookie(head->read_var2, 1002 &domain->acl_info_list) { 1003 struct tomoyo_acl_info *ptr = 1004 list_entry(head->read_var2, typeof(*ptr), list); 1005 done = tomoyo_print_entry(head, ptr); 1006 if (!done) 1007 break; 1008 } 1009 if (!done) 1010 break; 1011 head->read_var2 = NULL; 1012 head->read_step = 3; 1013tail_mark: 1014 done = tomoyo_io_printf(head, "\n"); 1015 if (!done) 1016 break; 1017 head->read_step = 1; 1018 if (head->read_single_domain) 1019 break; 1020 } 1021 head->read_eof = done; 1022} 1023 1024/** 1025 * tomoyo_write_domain_profile - Assign profile for specified domain. 1026 * 1027 * @head: Pointer to "struct tomoyo_io_buffer". 1028 * 1029 * Returns 0 on success, -EINVAL otherwise. 1030 * 1031 * This is equivalent to doing 1032 * 1033 * ( echo "select " $domainname; echo "use_profile " $profile ) | 1034 * /usr/sbin/tomoyo-loadpolicy -d 1035 * 1036 * Caller holds tomoyo_read_lock(). 1037 */ 1038static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) 1039{ 1040 char *data = head->write_buf; 1041 char *cp = strchr(data, ' '); 1042 struct tomoyo_domain_info *domain; 1043 unsigned long profile; 1044 1045 if (!cp) 1046 return -EINVAL; 1047 *cp = '\0'; 1048 domain = tomoyo_find_domain(cp + 1); 1049 if (strict_strtoul(data, 10, &profile)) 1050 return -EINVAL; 1051 if (domain && profile < TOMOYO_MAX_PROFILES 1052 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) 1053 domain->profile = (u8) profile; 1054 return 0; 1055} 1056 1057/** 1058 * tomoyo_read_domain_profile - Read only domainname and profile. 1059 * 1060 * @head: Pointer to "struct tomoyo_io_buffer". 1061 * 1062 * Returns list of profile number and domainname pairs. 1063 * 1064 * This is equivalent to doing 1065 * 1066 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | 1067 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) 1068 * domainname = $0; } else if ( $1 == "use_profile" ) { 1069 * print $2 " " domainname; domainname = ""; } } ; ' 1070 * 1071 * Caller holds tomoyo_read_lock(). 1072 */ 1073static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) 1074{ 1075 bool done = true; 1076 1077 if (head->read_eof) 1078 return; 1079 list_for_each_cookie(head->read_var1, &tomoyo_domain_list) { 1080 struct tomoyo_domain_info *domain = 1081 list_entry(head->read_var1, typeof(*domain), list); 1082 if (domain->is_deleted) 1083 continue; 1084 done = tomoyo_io_printf(head, "%u %s\n", domain->profile, 1085 domain->domainname->name); 1086 if (!done) 1087 break; 1088 } 1089 head->read_eof = done; 1090} 1091 1092/** 1093 * tomoyo_write_pid: Specify PID to obtain domainname. 1094 * 1095 * @head: Pointer to "struct tomoyo_io_buffer". 1096 * 1097 * Returns 0. 1098 */ 1099static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1100{ 1101 unsigned long pid; 1102 /* No error check. */ 1103 strict_strtoul(head->write_buf, 10, &pid); 1104 head->read_step = (int) pid; 1105 head->read_eof = false; 1106 return 0; 1107} 1108 1109/** 1110 * tomoyo_read_pid - Get domainname of the specified PID. 1111 * 1112 * @head: Pointer to "struct tomoyo_io_buffer". 1113 * 1114 * Returns the domainname which the specified PID is in on success, 1115 * empty string otherwise. 1116 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1117 * using read()/write() interface rather than sysctl() interface. 1118 */ 1119static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1120{ 1121 if (head->read_avail == 0 && !head->read_eof) { 1122 const int pid = head->read_step; 1123 struct task_struct *p; 1124 struct tomoyo_domain_info *domain = NULL; 1125 rcu_read_lock(); 1126 read_lock(&tasklist_lock); 1127 p = find_task_by_vpid(pid); 1128 if (p) 1129 domain = tomoyo_real_domain(p); 1130 read_unlock(&tasklist_lock); 1131 rcu_read_unlock(); 1132 if (domain) 1133 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, 1134 domain->domainname->name); 1135 head->read_eof = true; 1136 } 1137} 1138 1139static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1140 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] 1141 = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN, 1142 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] 1143 = TOMOYO_KEYWORD_INITIALIZE_DOMAIN, 1144 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN, 1145 [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN 1146}; 1147 1148/** 1149 * tomoyo_write_exception_policy - Write exception policy. 1150 * 1151 * @head: Pointer to "struct tomoyo_io_buffer". 1152 * 1153 * Returns 0 on success, negative value otherwise. 1154 * 1155 * Caller holds tomoyo_read_lock(). 1156 */ 1157static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) 1158{ 1159 char *data = head->write_buf; 1160 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 1161 u8 i; 1162 1163 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) { 1164 if (tomoyo_str_starts(&data, tomoyo_transition_type[i])) 1165 return tomoyo_write_transition_control(data, is_delete, 1166 i); 1167 } 1168 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR)) 1169 return tomoyo_write_aggregator_policy(data, is_delete); 1170 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) 1171 return tomoyo_write_globally_readable_policy(data, is_delete); 1172 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) 1173 return tomoyo_write_pattern_policy(data, is_delete); 1174 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) 1175 return tomoyo_write_no_rewrite_policy(data, is_delete); 1176 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) 1177 return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP); 1178 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) 1179 return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP); 1180 return -EINVAL; 1181} 1182 1183static void tomoyo_print_number(char *buffer, int buffer_len, 1184 const struct tomoyo_number_union *ptr) 1185{ 1186 int i; 1187 unsigned long min = ptr->values[0]; 1188 const unsigned long max = ptr->values[1]; 1189 u8 min_type = ptr->min_type; 1190 const u8 max_type = ptr->max_type; 1191 memset(buffer, 0, buffer_len); 1192 buffer_len -= 2; 1193 for (i = 0; i < 2; i++) { 1194 int len; 1195 switch (min_type) { 1196 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 1197 snprintf(buffer, buffer_len, "0x%lX", min); 1198 break; 1199 case TOMOYO_VALUE_TYPE_OCTAL: 1200 snprintf(buffer, buffer_len, "0%lo", min); 1201 break; 1202 default: 1203 snprintf(buffer, buffer_len, "%lu", min); 1204 break; 1205 } 1206 if (min == max && min_type == max_type) 1207 break; 1208 len = strlen(buffer); 1209 buffer[len++] = '-'; 1210 buffer += len; 1211 buffer_len -= len; 1212 min_type = max_type; 1213 min = max; 1214 } 1215} 1216 1217static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1218 [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP, 1219 [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP 1220}; 1221 1222/** 1223 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list. 1224 * 1225 * @head: Pointer to "struct tomoyo_io_buffer". 1226 * @idx: Index number. 1227 * 1228 * Returns true on success, false otherwise. 1229 * 1230 * Caller holds tomoyo_read_lock(). 1231 */ 1232static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1233{ 1234 const char *w[3] = { "", "", "" }; 1235 w[0] = tomoyo_group_name[idx]; 1236 list_for_each_cookie(head->read_var1, &tomoyo_group_list[idx]) { 1237 struct tomoyo_group *group = 1238 list_entry(head->read_var1, typeof(*group), list); 1239 w[1] = group->group_name->name; 1240 list_for_each_cookie(head->read_var2, &group->member_list) { 1241 char buffer[128]; 1242 struct tomoyo_acl_head *ptr = 1243 list_entry(head->read_var2, typeof(*ptr), list); 1244 if (ptr->is_deleted) 1245 continue; 1246 if (idx == TOMOYO_PATH_GROUP) { 1247 w[2] = container_of(ptr, 1248 struct tomoyo_path_group, 1249 head)->member_name->name; 1250 } else if (idx == TOMOYO_NUMBER_GROUP) { 1251 tomoyo_print_number(buffer, sizeof(buffer), 1252 &container_of 1253 (ptr, struct 1254 tomoyo_number_group, 1255 head)->number); 1256 w[2] = buffer; 1257 } 1258 if (!tomoyo_io_printf(head, "%s%s %s\n", w[0], w[1], 1259 w[2])) 1260 return false; 1261 } 1262 head->read_var2 = NULL; 1263 } 1264 head->read_var1 = NULL; 1265 return true; 1266} 1267 1268/** 1269 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1270 * 1271 * @head: Pointer to "struct tomoyo_io_buffer". 1272 * @idx: Index number. 1273 * 1274 * Returns true on success, false otherwise. 1275 * 1276 * Caller holds tomoyo_read_lock(). 1277 */ 1278static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1279{ 1280 list_for_each_cookie(head->read_var2, &tomoyo_policy_list[idx]) { 1281 const char *w[4] = { "", "", "", "" }; 1282 struct tomoyo_acl_head *acl = 1283 container_of(head->read_var2, typeof(*acl), list); 1284 if (acl->is_deleted) 1285 continue; 1286 switch (idx) { 1287 case TOMOYO_ID_TRANSITION_CONTROL: 1288 { 1289 struct tomoyo_transition_control *ptr = 1290 container_of(acl, typeof(*ptr), head); 1291 w[0] = tomoyo_transition_type[ptr->type]; 1292 if (ptr->program) 1293 w[1] = ptr->program->name; 1294 if (ptr->domainname) 1295 w[3] = ptr->domainname->name; 1296 if (w[1][0] && w[3][0]) 1297 w[2] = " from "; 1298 } 1299 break; 1300 case TOMOYO_ID_GLOBALLY_READABLE: 1301 { 1302 struct tomoyo_globally_readable_file_entry *ptr 1303 = container_of(acl, typeof(*ptr), head); 1304 w[0] = TOMOYO_KEYWORD_ALLOW_READ; 1305 w[1] = ptr->filename->name; 1306 } 1307 break; 1308 case TOMOYO_ID_AGGREGATOR: 1309 { 1310 struct tomoyo_aggregator_entry *ptr = 1311 container_of(acl, typeof(*ptr), head); 1312 w[0] = TOMOYO_KEYWORD_AGGREGATOR; 1313 w[1] = ptr->original_name->name; 1314 w[2] = " "; 1315 w[3] = ptr->aggregated_name->name; 1316 } 1317 break; 1318 case TOMOYO_ID_PATTERN: 1319 { 1320 struct tomoyo_pattern_entry *ptr = 1321 container_of(acl, typeof(*ptr), head); 1322 w[0] = TOMOYO_KEYWORD_FILE_PATTERN; 1323 w[1] = ptr->pattern->name; 1324 } 1325 break; 1326 case TOMOYO_ID_NO_REWRITE: 1327 { 1328 struct tomoyo_no_rewrite_entry *ptr = 1329 container_of(acl, typeof(*ptr), head); 1330 w[0] = TOMOYO_KEYWORD_DENY_REWRITE; 1331 w[1] = ptr->pattern->name; 1332 } 1333 break; 1334 default: 1335 continue; 1336 } 1337 if (!tomoyo_io_printf(head, "%s%s%s%s\n", w[0], w[1], w[2], 1338 w[3])) 1339 return false; 1340 } 1341 head->read_var2 = NULL; 1342 return true; 1343} 1344 1345/** 1346 * tomoyo_read_exception_policy - Read exception policy. 1347 * 1348 * @head: Pointer to "struct tomoyo_io_buffer". 1349 * 1350 * Caller holds tomoyo_read_lock(). 1351 */ 1352static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) 1353{ 1354 if (head->read_eof) 1355 return; 1356 while (head->read_step < TOMOYO_MAX_POLICY && 1357 tomoyo_read_policy(head, head->read_step)) 1358 head->read_step++; 1359 if (head->read_step < TOMOYO_MAX_POLICY) 1360 return; 1361 while (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1362 tomoyo_read_group(head, head->read_step - TOMOYO_MAX_POLICY)) 1363 head->read_step++; 1364 if (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1365 return; 1366 head->read_eof = true; 1367} 1368 1369/** 1370 * tomoyo_print_header - Get header line of audit log. 1371 * 1372 * @r: Pointer to "struct tomoyo_request_info". 1373 * 1374 * Returns string representation. 1375 * 1376 * This function uses kmalloc(), so caller must kfree() if this function 1377 * didn't return NULL. 1378 */ 1379static char *tomoyo_print_header(struct tomoyo_request_info *r) 1380{ 1381 static const char *tomoyo_mode_4[4] = { 1382 "disabled", "learning", "permissive", "enforcing" 1383 }; 1384 struct timeval tv; 1385 const pid_t gpid = task_pid_nr(current); 1386 static const int tomoyo_buffer_len = 4096; 1387 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); 1388 if (!buffer) 1389 return NULL; 1390 do_gettimeofday(&tv); 1391 snprintf(buffer, tomoyo_buffer_len - 1, 1392 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" 1393 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" 1394 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", 1395 tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, 1396 (pid_t) sys_getpid(), (pid_t) sys_getppid(), 1397 current_uid(), current_gid(), current_euid(), 1398 current_egid(), current_suid(), current_sgid(), 1399 current_fsuid(), current_fsgid()); 1400 return buffer; 1401} 1402 1403/** 1404 * tomoyo_init_audit_log - Allocate buffer for audit logs. 1405 * 1406 * @len: Required size. 1407 * @r: Pointer to "struct tomoyo_request_info". 1408 * 1409 * Returns pointer to allocated memory. 1410 * 1411 * The @len is updated to add the header lines' size on success. 1412 * 1413 * This function uses kzalloc(), so caller must kfree() if this function 1414 * didn't return NULL. 1415 */ 1416static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) 1417{ 1418 char *buf = NULL; 1419 const char *header; 1420 const char *domainname; 1421 if (!r->domain) 1422 r->domain = tomoyo_domain(); 1423 domainname = r->domain->domainname->name; 1424 header = tomoyo_print_header(r); 1425 if (!header) 1426 return NULL; 1427 *len += strlen(domainname) + strlen(header) + 10; 1428 buf = kzalloc(*len, GFP_NOFS); 1429 if (buf) 1430 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); 1431 kfree(header); 1432 return buf; 1433} 1434 1435/* Wait queue for tomoyo_query_list. */ 1436static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1437 1438/* Lock for manipulating tomoyo_query_list. */ 1439static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1440 1441/* Structure for query. */ 1442struct tomoyo_query_entry { 1443 struct list_head list; 1444 char *query; 1445 int query_len; 1446 unsigned int serial; 1447 int timer; 1448 int answer; 1449}; 1450 1451/* The list for "struct tomoyo_query_entry". */ 1452static LIST_HEAD(tomoyo_query_list); 1453 1454/* 1455 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1456 * interface. 1457 */ 1458static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1459 1460/** 1461 * tomoyo_supervisor - Ask for the supervisor's decision. 1462 * 1463 * @r: Pointer to "struct tomoyo_request_info". 1464 * @fmt: The printf()'s format string, followed by parameters. 1465 * 1466 * Returns 0 if the supervisor decided to permit the access request which 1467 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 1468 * supervisor decided to retry the access request which violated the policy in 1469 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 1470 */ 1471int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 1472{ 1473 va_list args; 1474 int error = -EPERM; 1475 int pos; 1476 int len; 1477 static unsigned int tomoyo_serial; 1478 struct tomoyo_query_entry *tomoyo_query_entry = NULL; 1479 bool quota_exceeded = false; 1480 char *header; 1481 switch (r->mode) { 1482 char *buffer; 1483 case TOMOYO_CONFIG_LEARNING: 1484 if (!tomoyo_domain_quota_is_ok(r)) 1485 return 0; 1486 va_start(args, fmt); 1487 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; 1488 va_end(args); 1489 buffer = kmalloc(len, GFP_NOFS); 1490 if (!buffer) 1491 return 0; 1492 va_start(args, fmt); 1493 vsnprintf(buffer, len - 1, fmt, args); 1494 va_end(args); 1495 tomoyo_normalize_line(buffer); 1496 tomoyo_write_domain_policy2(buffer, r->domain, false); 1497 kfree(buffer); 1498 /* fall through */ 1499 case TOMOYO_CONFIG_PERMISSIVE: 1500 return 0; 1501 } 1502 if (!r->domain) 1503 r->domain = tomoyo_domain(); 1504 if (!atomic_read(&tomoyo_query_observers)) 1505 return -EPERM; 1506 va_start(args, fmt); 1507 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; 1508 va_end(args); 1509 header = tomoyo_init_audit_log(&len, r); 1510 if (!header) 1511 goto out; 1512 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); 1513 if (!tomoyo_query_entry) 1514 goto out; 1515 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); 1516 if (!tomoyo_query_entry->query) 1517 goto out; 1518 len = ksize(tomoyo_query_entry->query); 1519 INIT_LIST_HEAD(&tomoyo_query_entry->list); 1520 spin_lock(&tomoyo_query_list_lock); 1521 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + 1522 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { 1523 quota_exceeded = true; 1524 } else { 1525 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); 1526 tomoyo_query_entry->serial = tomoyo_serial++; 1527 } 1528 spin_unlock(&tomoyo_query_list_lock); 1529 if (quota_exceeded) 1530 goto out; 1531 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", 1532 tomoyo_query_entry->serial, r->retry, header); 1533 kfree(header); 1534 header = NULL; 1535 va_start(args, fmt); 1536 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); 1537 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; 1538 va_end(args); 1539 spin_lock(&tomoyo_query_list_lock); 1540 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); 1541 spin_unlock(&tomoyo_query_list_lock); 1542 /* Give 10 seconds for supervisor's opinion. */ 1543 for (tomoyo_query_entry->timer = 0; 1544 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; 1545 tomoyo_query_entry->timer++) { 1546 wake_up(&tomoyo_query_wait); 1547 set_current_state(TASK_INTERRUPTIBLE); 1548 schedule_timeout(HZ / 10); 1549 if (tomoyo_query_entry->answer) 1550 break; 1551 } 1552 spin_lock(&tomoyo_query_list_lock); 1553 list_del(&tomoyo_query_entry->list); 1554 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); 1555 spin_unlock(&tomoyo_query_list_lock); 1556 switch (tomoyo_query_entry->answer) { 1557 case 3: /* Asked to retry by administrator. */ 1558 error = TOMOYO_RETRY_REQUEST; 1559 r->retry++; 1560 break; 1561 case 1: 1562 /* Granted by administrator. */ 1563 error = 0; 1564 break; 1565 case 0: 1566 /* Timed out. */ 1567 break; 1568 default: 1569 /* Rejected by administrator. */ 1570 break; 1571 } 1572 out: 1573 if (tomoyo_query_entry) 1574 kfree(tomoyo_query_entry->query); 1575 kfree(tomoyo_query_entry); 1576 kfree(header); 1577 return error; 1578} 1579 1580/** 1581 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 1582 * 1583 * @file: Pointer to "struct file". 1584 * @wait: Pointer to "poll_table". 1585 * 1586 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 1587 * 1588 * Waits for access requests which violated policy in enforcing mode. 1589 */ 1590static int tomoyo_poll_query(struct file *file, poll_table *wait) 1591{ 1592 struct list_head *tmp; 1593 bool found = false; 1594 u8 i; 1595 for (i = 0; i < 2; i++) { 1596 spin_lock(&tomoyo_query_list_lock); 1597 list_for_each(tmp, &tomoyo_query_list) { 1598 struct tomoyo_query_entry *ptr 1599 = list_entry(tmp, struct tomoyo_query_entry, 1600 list); 1601 if (ptr->answer) 1602 continue; 1603 found = true; 1604 break; 1605 } 1606 spin_unlock(&tomoyo_query_list_lock); 1607 if (found) 1608 return POLLIN | POLLRDNORM; 1609 if (i) 1610 break; 1611 poll_wait(file, &tomoyo_query_wait, wait); 1612 } 1613 return 0; 1614} 1615 1616/** 1617 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 1618 * 1619 * @head: Pointer to "struct tomoyo_io_buffer". 1620 */ 1621static void tomoyo_read_query(struct tomoyo_io_buffer *head) 1622{ 1623 struct list_head *tmp; 1624 int pos = 0; 1625 int len = 0; 1626 char *buf; 1627 if (head->read_avail) 1628 return; 1629 if (head->read_buf) { 1630 kfree(head->read_buf); 1631 head->read_buf = NULL; 1632 head->readbuf_size = 0; 1633 } 1634 spin_lock(&tomoyo_query_list_lock); 1635 list_for_each(tmp, &tomoyo_query_list) { 1636 struct tomoyo_query_entry *ptr 1637 = list_entry(tmp, struct tomoyo_query_entry, list); 1638 if (ptr->answer) 1639 continue; 1640 if (pos++ != head->read_step) 1641 continue; 1642 len = ptr->query_len; 1643 break; 1644 } 1645 spin_unlock(&tomoyo_query_list_lock); 1646 if (!len) { 1647 head->read_step = 0; 1648 return; 1649 } 1650 buf = kzalloc(len, GFP_NOFS); 1651 if (!buf) 1652 return; 1653 pos = 0; 1654 spin_lock(&tomoyo_query_list_lock); 1655 list_for_each(tmp, &tomoyo_query_list) { 1656 struct tomoyo_query_entry *ptr 1657 = list_entry(tmp, struct tomoyo_query_entry, list); 1658 if (ptr->answer) 1659 continue; 1660 if (pos++ != head->read_step) 1661 continue; 1662 /* 1663 * Some query can be skipped because tomoyo_query_list 1664 * can change, but I don't care. 1665 */ 1666 if (len == ptr->query_len) 1667 memmove(buf, ptr->query, len); 1668 break; 1669 } 1670 spin_unlock(&tomoyo_query_list_lock); 1671 if (buf[0]) { 1672 head->read_avail = len; 1673 head->readbuf_size = head->read_avail; 1674 head->read_buf = buf; 1675 head->read_step++; 1676 } else { 1677 kfree(buf); 1678 } 1679} 1680 1681/** 1682 * tomoyo_write_answer - Write the supervisor's decision. 1683 * 1684 * @head: Pointer to "struct tomoyo_io_buffer". 1685 * 1686 * Returns 0 on success, -EINVAL otherwise. 1687 */ 1688static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 1689{ 1690 char *data = head->write_buf; 1691 struct list_head *tmp; 1692 unsigned int serial; 1693 unsigned int answer; 1694 spin_lock(&tomoyo_query_list_lock); 1695 list_for_each(tmp, &tomoyo_query_list) { 1696 struct tomoyo_query_entry *ptr 1697 = list_entry(tmp, struct tomoyo_query_entry, list); 1698 ptr->timer = 0; 1699 } 1700 spin_unlock(&tomoyo_query_list_lock); 1701 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 1702 return -EINVAL; 1703 spin_lock(&tomoyo_query_list_lock); 1704 list_for_each(tmp, &tomoyo_query_list) { 1705 struct tomoyo_query_entry *ptr 1706 = list_entry(tmp, struct tomoyo_query_entry, list); 1707 if (ptr->serial != serial) 1708 continue; 1709 if (!ptr->answer) 1710 ptr->answer = answer; 1711 break; 1712 } 1713 spin_unlock(&tomoyo_query_list_lock); 1714 return 0; 1715} 1716 1717/** 1718 * tomoyo_read_version: Get version. 1719 * 1720 * @head: Pointer to "struct tomoyo_io_buffer". 1721 * 1722 * Returns version information. 1723 */ 1724static void tomoyo_read_version(struct tomoyo_io_buffer *head) 1725{ 1726 if (!head->read_eof) { 1727 tomoyo_io_printf(head, "2.3.0-pre"); 1728 head->read_eof = true; 1729 } 1730} 1731 1732/** 1733 * tomoyo_read_self_domain - Get the current process's domainname. 1734 * 1735 * @head: Pointer to "struct tomoyo_io_buffer". 1736 * 1737 * Returns the current process's domainname. 1738 */ 1739static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head) 1740{ 1741 if (!head->read_eof) { 1742 /* 1743 * tomoyo_domain()->domainname != NULL 1744 * because every process belongs to a domain and 1745 * the domain's name cannot be NULL. 1746 */ 1747 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); 1748 head->read_eof = true; 1749 } 1750} 1751 1752/** 1753 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 1754 * 1755 * @type: Type of interface. 1756 * @file: Pointer to "struct file". 1757 * 1758 * Associates policy handler and returns 0 on success, -ENOMEM otherwise. 1759 * 1760 * Caller acquires tomoyo_read_lock(). 1761 */ 1762int tomoyo_open_control(const u8 type, struct file *file) 1763{ 1764 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 1765 1766 if (!head) 1767 return -ENOMEM; 1768 mutex_init(&head->io_sem); 1769 head->type = type; 1770 switch (type) { 1771 case TOMOYO_DOMAINPOLICY: 1772 /* /sys/kernel/security/tomoyo/domain_policy */ 1773 head->write = tomoyo_write_domain_policy; 1774 head->read = tomoyo_read_domain_policy; 1775 break; 1776 case TOMOYO_EXCEPTIONPOLICY: 1777 /* /sys/kernel/security/tomoyo/exception_policy */ 1778 head->write = tomoyo_write_exception_policy; 1779 head->read = tomoyo_read_exception_policy; 1780 break; 1781 case TOMOYO_SELFDOMAIN: 1782 /* /sys/kernel/security/tomoyo/self_domain */ 1783 head->read = tomoyo_read_self_domain; 1784 break; 1785 case TOMOYO_DOMAIN_STATUS: 1786 /* /sys/kernel/security/tomoyo/.domain_status */ 1787 head->write = tomoyo_write_domain_profile; 1788 head->read = tomoyo_read_domain_profile; 1789 break; 1790 case TOMOYO_PROCESS_STATUS: 1791 /* /sys/kernel/security/tomoyo/.process_status */ 1792 head->write = tomoyo_write_pid; 1793 head->read = tomoyo_read_pid; 1794 break; 1795 case TOMOYO_VERSION: 1796 /* /sys/kernel/security/tomoyo/version */ 1797 head->read = tomoyo_read_version; 1798 head->readbuf_size = 128; 1799 break; 1800 case TOMOYO_MEMINFO: 1801 /* /sys/kernel/security/tomoyo/meminfo */ 1802 head->write = tomoyo_write_memory_quota; 1803 head->read = tomoyo_read_memory_counter; 1804 head->readbuf_size = 512; 1805 break; 1806 case TOMOYO_PROFILE: 1807 /* /sys/kernel/security/tomoyo/profile */ 1808 head->write = tomoyo_write_profile; 1809 head->read = tomoyo_read_profile; 1810 break; 1811 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 1812 head->poll = tomoyo_poll_query; 1813 head->write = tomoyo_write_answer; 1814 head->read = tomoyo_read_query; 1815 break; 1816 case TOMOYO_MANAGER: 1817 /* /sys/kernel/security/tomoyo/manager */ 1818 head->write = tomoyo_write_manager_policy; 1819 head->read = tomoyo_read_manager_policy; 1820 break; 1821 } 1822 if (!(file->f_mode & FMODE_READ)) { 1823 /* 1824 * No need to allocate read_buf since it is not opened 1825 * for reading. 1826 */ 1827 head->read = NULL; 1828 head->poll = NULL; 1829 } else if (!head->poll) { 1830 /* Don't allocate read_buf for poll() access. */ 1831 if (!head->readbuf_size) 1832 head->readbuf_size = 4096 * 2; 1833 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 1834 if (!head->read_buf) { 1835 kfree(head); 1836 return -ENOMEM; 1837 } 1838 } 1839 if (!(file->f_mode & FMODE_WRITE)) { 1840 /* 1841 * No need to allocate write_buf since it is not opened 1842 * for writing. 1843 */ 1844 head->write = NULL; 1845 } else if (head->write) { 1846 head->writebuf_size = 4096 * 2; 1847 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 1848 if (!head->write_buf) { 1849 kfree(head->read_buf); 1850 kfree(head); 1851 return -ENOMEM; 1852 } 1853 } 1854 if (type != TOMOYO_QUERY) 1855 head->reader_idx = tomoyo_read_lock(); 1856 file->private_data = head; 1857 /* 1858 * Call the handler now if the file is 1859 * /sys/kernel/security/tomoyo/self_domain 1860 * so that the user can use 1861 * cat < /sys/kernel/security/tomoyo/self_domain" 1862 * to know the current process's domainname. 1863 */ 1864 if (type == TOMOYO_SELFDOMAIN) 1865 tomoyo_read_control(file, NULL, 0); 1866 /* 1867 * If the file is /sys/kernel/security/tomoyo/query , increment the 1868 * observer counter. 1869 * The obserber counter is used by tomoyo_supervisor() to see if 1870 * there is some process monitoring /sys/kernel/security/tomoyo/query. 1871 */ 1872 else if (type == TOMOYO_QUERY) 1873 atomic_inc(&tomoyo_query_observers); 1874 return 0; 1875} 1876 1877/** 1878 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 1879 * 1880 * @file: Pointer to "struct file". 1881 * @wait: Pointer to "poll_table". 1882 * 1883 * Waits for read readiness. 1884 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . 1885 */ 1886int tomoyo_poll_control(struct file *file, poll_table *wait) 1887{ 1888 struct tomoyo_io_buffer *head = file->private_data; 1889 if (!head->poll) 1890 return -ENOSYS; 1891 return head->poll(file, wait); 1892} 1893 1894/** 1895 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 1896 * 1897 * @file: Pointer to "struct file". 1898 * @buffer: Poiner to buffer to write to. 1899 * @buffer_len: Size of @buffer. 1900 * 1901 * Returns bytes read on success, negative value otherwise. 1902 * 1903 * Caller holds tomoyo_read_lock(). 1904 */ 1905int tomoyo_read_control(struct file *file, char __user *buffer, 1906 const int buffer_len) 1907{ 1908 int len = 0; 1909 struct tomoyo_io_buffer *head = file->private_data; 1910 char *cp; 1911 1912 if (!head->read) 1913 return -ENOSYS; 1914 if (mutex_lock_interruptible(&head->io_sem)) 1915 return -EINTR; 1916 /* Call the policy handler. */ 1917 head->read(head); 1918 if (len < 0) 1919 goto out; 1920 /* Write to buffer. */ 1921 len = head->read_avail; 1922 if (len > buffer_len) 1923 len = buffer_len; 1924 if (!len) 1925 goto out; 1926 /* head->read_buf changes by some functions. */ 1927 cp = head->read_buf; 1928 if (copy_to_user(buffer, cp, len)) { 1929 len = -EFAULT; 1930 goto out; 1931 } 1932 head->read_avail -= len; 1933 memmove(cp, cp + len, head->read_avail); 1934 out: 1935 mutex_unlock(&head->io_sem); 1936 return len; 1937} 1938 1939/** 1940 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 1941 * 1942 * @file: Pointer to "struct file". 1943 * @buffer: Pointer to buffer to read from. 1944 * @buffer_len: Size of @buffer. 1945 * 1946 * Returns @buffer_len on success, negative value otherwise. 1947 * 1948 * Caller holds tomoyo_read_lock(). 1949 */ 1950int tomoyo_write_control(struct file *file, const char __user *buffer, 1951 const int buffer_len) 1952{ 1953 struct tomoyo_io_buffer *head = file->private_data; 1954 int error = buffer_len; 1955 int avail_len = buffer_len; 1956 char *cp0 = head->write_buf; 1957 1958 if (!head->write) 1959 return -ENOSYS; 1960 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 1961 return -EFAULT; 1962 /* Don't allow updating policies by non manager programs. */ 1963 if (head->write != tomoyo_write_pid && 1964 head->write != tomoyo_write_domain_policy && 1965 !tomoyo_policy_manager()) 1966 return -EPERM; 1967 if (mutex_lock_interruptible(&head->io_sem)) 1968 return -EINTR; 1969 /* Read a line and dispatch it to the policy handler. */ 1970 while (avail_len > 0) { 1971 char c; 1972 if (head->write_avail >= head->writebuf_size - 1) { 1973 error = -ENOMEM; 1974 break; 1975 } else if (get_user(c, buffer)) { 1976 error = -EFAULT; 1977 break; 1978 } 1979 buffer++; 1980 avail_len--; 1981 cp0[head->write_avail++] = c; 1982 if (c != '\n') 1983 continue; 1984 cp0[head->write_avail - 1] = '\0'; 1985 head->write_avail = 0; 1986 tomoyo_normalize_line(cp0); 1987 head->write(head); 1988 } 1989 mutex_unlock(&head->io_sem); 1990 return error; 1991} 1992 1993/** 1994 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 1995 * 1996 * @file: Pointer to "struct file". 1997 * 1998 * Releases memory and returns 0. 1999 * 2000 * Caller looses tomoyo_read_lock(). 2001 */ 2002int tomoyo_close_control(struct file *file) 2003{ 2004 struct tomoyo_io_buffer *head = file->private_data; 2005 const bool is_write = !!head->write_buf; 2006 2007 /* 2008 * If the file is /sys/kernel/security/tomoyo/query , decrement the 2009 * observer counter. 2010 */ 2011 if (head->type == TOMOYO_QUERY) 2012 atomic_dec(&tomoyo_query_observers); 2013 else 2014 tomoyo_read_unlock(head->reader_idx); 2015 /* Release memory used for policy I/O. */ 2016 kfree(head->read_buf); 2017 head->read_buf = NULL; 2018 kfree(head->write_buf); 2019 head->write_buf = NULL; 2020 kfree(head); 2021 head = NULL; 2022 file->private_data = NULL; 2023 if (is_write) 2024 tomoyo_run_gc(); 2025 return 0; 2026} 2027 2028/** 2029 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2030 */ 2031void tomoyo_check_profile(void) 2032{ 2033 struct tomoyo_domain_info *domain; 2034 const int idx = tomoyo_read_lock(); 2035 tomoyo_policy_loaded = true; 2036 /* Check all profiles currently assigned to domains are defined. */ 2037 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2038 const u8 profile = domain->profile; 2039 if (tomoyo_profile_ptr[profile]) 2040 continue; 2041 panic("Profile %u (used by '%s') not defined.\n", 2042 profile, domain->domainname->name); 2043 } 2044 tomoyo_read_unlock(idx); 2045 if (tomoyo_profile_version != 20090903) 2046 panic("Profile version %u is not supported.\n", 2047 tomoyo_profile_version); 2048 printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n"); 2049 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2050} 2051