common.c revision 063821c8160568b3390044390c8328e36c5696ad
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 (!strcmp(data, "allow_execute")) { 598 head->print_execute_only = true; 599 return true; 600 } 601 if (sscanf(data, "pid=%u", &pid) == 1 || 602 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { 603 struct task_struct *p; 604 rcu_read_lock(); 605 read_lock(&tasklist_lock); 606 if (global_pid) 607 p = find_task_by_pid_ns(pid, &init_pid_ns); 608 else 609 p = find_task_by_vpid(pid); 610 if (p) 611 domain = tomoyo_real_domain(p); 612 read_unlock(&tasklist_lock); 613 rcu_read_unlock(); 614 } else if (!strncmp(data, "domain=", 7)) { 615 if (tomoyo_domain_def(data + 7)) 616 domain = tomoyo_find_domain(data + 7); 617 } else 618 return false; 619 head->write_var1 = domain; 620 /* Accessing read_buf is safe because head->io_sem is held. */ 621 if (!head->read_buf) 622 return true; /* Do nothing if open(O_WRONLY). */ 623 head->read_avail = 0; 624 tomoyo_io_printf(head, "# select %s\n", data); 625 head->read_single_domain = true; 626 head->read_eof = !domain; 627 head->read_var1 = &domain->list; 628 head->read_var2 = NULL; 629 head->read_bit = 0; 630 head->read_step = 0; 631 if (domain && domain->is_deleted) 632 tomoyo_io_printf(head, "# This is a deleted domain.\n"); 633 return true; 634} 635 636/** 637 * tomoyo_delete_domain - Delete a domain. 638 * 639 * @domainname: The name of domain. 640 * 641 * Returns 0. 642 * 643 * Caller holds tomoyo_read_lock(). 644 */ 645static int tomoyo_delete_domain(char *domainname) 646{ 647 struct tomoyo_domain_info *domain; 648 struct tomoyo_path_info name; 649 650 name.name = domainname; 651 tomoyo_fill_path_info(&name); 652 if (mutex_lock_interruptible(&tomoyo_policy_lock)) 653 return 0; 654 /* Is there an active domain? */ 655 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 656 /* Never delete tomoyo_kernel_domain */ 657 if (domain == &tomoyo_kernel_domain) 658 continue; 659 if (domain->is_deleted || 660 tomoyo_pathcmp(domain->domainname, &name)) 661 continue; 662 domain->is_deleted = true; 663 break; 664 } 665 mutex_unlock(&tomoyo_policy_lock); 666 return 0; 667} 668 669/** 670 * tomoyo_write_domain_policy2 - Write domain policy. 671 * 672 * @head: Pointer to "struct tomoyo_io_buffer". 673 * 674 * Returns 0 on success, negative value otherwise. 675 * 676 * Caller holds tomoyo_read_lock(). 677 */ 678static int tomoyo_write_domain_policy2(char *data, 679 struct tomoyo_domain_info *domain, 680 const bool is_delete) 681{ 682 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) 683 return tomoyo_write_mount_policy(data, domain, is_delete); 684 return tomoyo_write_file_policy(data, domain, is_delete); 685} 686 687/** 688 * tomoyo_write_domain_policy - Write domain policy. 689 * 690 * @head: Pointer to "struct tomoyo_io_buffer". 691 * 692 * Returns 0 on success, negative value otherwise. 693 * 694 * Caller holds tomoyo_read_lock(). 695 */ 696static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) 697{ 698 char *data = head->write_buf; 699 struct tomoyo_domain_info *domain = head->write_var1; 700 bool is_delete = false; 701 bool is_select = false; 702 unsigned int profile; 703 704 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) 705 is_delete = true; 706 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) 707 is_select = true; 708 if (is_select && tomoyo_select_one(head, data)) 709 return 0; 710 /* Don't allow updating policies by non manager programs. */ 711 if (!tomoyo_policy_manager()) 712 return -EPERM; 713 if (tomoyo_domain_def(data)) { 714 domain = NULL; 715 if (is_delete) 716 tomoyo_delete_domain(data); 717 else if (is_select) 718 domain = tomoyo_find_domain(data); 719 else 720 domain = tomoyo_find_or_assign_new_domain(data, 0); 721 head->write_var1 = domain; 722 return 0; 723 } 724 if (!domain) 725 return -EINVAL; 726 727 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 728 && profile < TOMOYO_MAX_PROFILES) { 729 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) 730 domain->profile = (u8) profile; 731 return 0; 732 } 733 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { 734 domain->ignore_global_allow_read = !is_delete; 735 return 0; 736 } 737 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { 738 domain->quota_warned = !is_delete; 739 return 0; 740 } 741 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { 742 domain->transition_failed = !is_delete; 743 return 0; 744 } 745 return tomoyo_write_domain_policy2(data, domain, is_delete); 746} 747 748/** 749 * tomoyo_print_path_acl - Print a single path ACL entry. 750 * 751 * @head: Pointer to "struct tomoyo_io_buffer". 752 * @ptr: Pointer to "struct tomoyo_path_acl". 753 * 754 * Returns true on success, false otherwise. 755 */ 756static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, 757 struct tomoyo_path_acl *ptr) 758{ 759 int pos; 760 u8 bit; 761 const u16 perm = ptr->perm; 762 763 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { 764 if (!(perm & (1 << bit))) 765 continue; 766 if (head->print_execute_only && bit != TOMOYO_TYPE_EXECUTE) 767 continue; 768 /* Print "read/write" instead of "read" and "write". */ 769 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) 770 && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) 771 continue; 772 pos = head->read_avail; 773 if (!tomoyo_io_printf(head, "allow_%s ", 774 tomoyo_path_keyword[bit]) || 775 !tomoyo_print_name_union(head, &ptr->name) || 776 !tomoyo_io_printf(head, "\n")) 777 goto out; 778 } 779 head->read_bit = 0; 780 return true; 781 out: 782 head->read_bit = bit; 783 head->read_avail = pos; 784 return false; 785} 786 787/** 788 * tomoyo_print_path2_acl - Print a double path ACL entry. 789 * 790 * @head: Pointer to "struct tomoyo_io_buffer". 791 * @ptr: Pointer to "struct tomoyo_path2_acl". 792 * 793 * Returns true on success, false otherwise. 794 */ 795static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, 796 struct tomoyo_path2_acl *ptr) 797{ 798 int pos; 799 const u8 perm = ptr->perm; 800 u8 bit; 801 802 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { 803 if (!(perm & (1 << bit))) 804 continue; 805 pos = head->read_avail; 806 if (!tomoyo_io_printf(head, "allow_%s ", 807 tomoyo_path2_keyword[bit]) || 808 !tomoyo_print_name_union(head, &ptr->name1) || 809 !tomoyo_print_name_union(head, &ptr->name2) || 810 !tomoyo_io_printf(head, "\n")) 811 goto out; 812 } 813 head->read_bit = 0; 814 return true; 815 out: 816 head->read_bit = bit; 817 head->read_avail = pos; 818 return false; 819} 820 821/** 822 * tomoyo_print_path_number_acl - Print a path_number ACL entry. 823 * 824 * @head: Pointer to "struct tomoyo_io_buffer". 825 * @ptr: Pointer to "struct tomoyo_path_number_acl". 826 * 827 * Returns true on success, false otherwise. 828 */ 829static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head, 830 struct tomoyo_path_number_acl *ptr) 831{ 832 int pos; 833 u8 bit; 834 const u8 perm = ptr->perm; 835 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; 836 bit++) { 837 if (!(perm & (1 << bit))) 838 continue; 839 pos = head->read_avail; 840 if (!tomoyo_io_printf(head, "allow_%s", 841 tomoyo_path_number_keyword[bit]) || 842 !tomoyo_print_name_union(head, &ptr->name) || 843 !tomoyo_print_number_union(head, &ptr->number) || 844 !tomoyo_io_printf(head, "\n")) 845 goto out; 846 } 847 head->read_bit = 0; 848 return true; 849 out: 850 head->read_bit = bit; 851 head->read_avail = pos; 852 return false; 853} 854 855/** 856 * tomoyo_print_mkdev_acl - Print a mkdev ACL entry. 857 * 858 * @head: Pointer to "struct tomoyo_io_buffer". 859 * @ptr: Pointer to "struct tomoyo_mkdev_acl". 860 * 861 * Returns true on success, false otherwise. 862 */ 863static bool tomoyo_print_mkdev_acl(struct tomoyo_io_buffer *head, 864 struct tomoyo_mkdev_acl *ptr) 865{ 866 int pos; 867 u8 bit; 868 const u16 perm = ptr->perm; 869 for (bit = head->read_bit; bit < TOMOYO_MAX_MKDEV_OPERATION; 870 bit++) { 871 if (!(perm & (1 << bit))) 872 continue; 873 pos = head->read_avail; 874 if (!tomoyo_io_printf(head, "allow_%s", 875 tomoyo_mkdev_keyword[bit]) || 876 !tomoyo_print_name_union(head, &ptr->name) || 877 !tomoyo_print_number_union(head, &ptr->mode) || 878 !tomoyo_print_number_union(head, &ptr->major) || 879 !tomoyo_print_number_union(head, &ptr->minor) || 880 !tomoyo_io_printf(head, "\n")) 881 goto out; 882 } 883 head->read_bit = 0; 884 return true; 885 out: 886 head->read_bit = bit; 887 head->read_avail = pos; 888 return false; 889} 890 891/** 892 * tomoyo_print_mount_acl - Print a mount ACL entry. 893 * 894 * @head: Pointer to "struct tomoyo_io_buffer". 895 * @ptr: Pointer to "struct tomoyo_mount_acl". 896 * 897 * Returns true on success, false otherwise. 898 */ 899static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head, 900 struct tomoyo_mount_acl *ptr) 901{ 902 const int pos = head->read_avail; 903 if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || 904 !tomoyo_print_name_union(head, &ptr->dev_name) || 905 !tomoyo_print_name_union(head, &ptr->dir_name) || 906 !tomoyo_print_name_union(head, &ptr->fs_type) || 907 !tomoyo_print_number_union(head, &ptr->flags) || 908 !tomoyo_io_printf(head, "\n")) { 909 head->read_avail = pos; 910 return false; 911 } 912 return true; 913} 914 915/** 916 * tomoyo_print_entry - Print an ACL entry. 917 * 918 * @head: Pointer to "struct tomoyo_io_buffer". 919 * @ptr: Pointer to an ACL entry. 920 * 921 * Returns true on success, false otherwise. 922 */ 923static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, 924 struct tomoyo_acl_info *ptr) 925{ 926 const u8 acl_type = ptr->type; 927 928 if (ptr->is_deleted) 929 return true; 930 if (acl_type == TOMOYO_TYPE_PATH_ACL) { 931 struct tomoyo_path_acl *acl 932 = container_of(ptr, struct tomoyo_path_acl, head); 933 return tomoyo_print_path_acl(head, acl); 934 } 935 if (head->print_execute_only) 936 return true; 937 if (acl_type == TOMOYO_TYPE_PATH2_ACL) { 938 struct tomoyo_path2_acl *acl 939 = container_of(ptr, struct tomoyo_path2_acl, head); 940 return tomoyo_print_path2_acl(head, acl); 941 } 942 if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { 943 struct tomoyo_path_number_acl *acl 944 = container_of(ptr, struct tomoyo_path_number_acl, 945 head); 946 return tomoyo_print_path_number_acl(head, acl); 947 } 948 if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { 949 struct tomoyo_mkdev_acl *acl 950 = container_of(ptr, struct tomoyo_mkdev_acl, 951 head); 952 return tomoyo_print_mkdev_acl(head, acl); 953 } 954 if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { 955 struct tomoyo_mount_acl *acl 956 = container_of(ptr, struct tomoyo_mount_acl, head); 957 return tomoyo_print_mount_acl(head, acl); 958 } 959 BUG(); /* This must not happen. */ 960 return false; 961} 962 963/** 964 * tomoyo_read_domain_policy - Read domain policy. 965 * 966 * @head: Pointer to "struct tomoyo_io_buffer". 967 * 968 * Caller holds tomoyo_read_lock(). 969 */ 970static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) 971{ 972 bool done = true; 973 974 if (head->read_eof) 975 return; 976 if (head->read_step == 0) 977 head->read_step = 1; 978 list_for_each_cookie(head->read_var1, &tomoyo_domain_list) { 979 struct tomoyo_domain_info *domain = 980 list_entry(head->read_var1, typeof(*domain), list); 981 const char *quota_exceeded = ""; 982 const char *transition_failed = ""; 983 const char *ignore_global_allow_read = ""; 984 if (head->read_step != 1) 985 goto acl_loop; 986 if (domain->is_deleted && !head->read_single_domain) 987 continue; 988 /* Print domainname and flags. */ 989 if (domain->quota_warned) 990 quota_exceeded = "quota_exceeded\n"; 991 if (domain->transition_failed) 992 transition_failed = "transition_failed\n"; 993 if (domain->ignore_global_allow_read) 994 ignore_global_allow_read 995 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; 996 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE 997 "%u\n%s%s%s\n", 998 domain->domainname->name, 999 domain->profile, quota_exceeded, 1000 transition_failed, 1001 ignore_global_allow_read); 1002 if (!done) 1003 break; 1004 head->read_step = 2; 1005acl_loop: 1006 if (head->read_step == 3) 1007 goto tail_mark; 1008 /* Print ACL entries in the domain. */ 1009 list_for_each_cookie(head->read_var2, 1010 &domain->acl_info_list) { 1011 struct tomoyo_acl_info *ptr = 1012 list_entry(head->read_var2, typeof(*ptr), list); 1013 done = tomoyo_print_entry(head, ptr); 1014 if (!done) 1015 break; 1016 } 1017 if (!done) 1018 break; 1019 head->read_var2 = NULL; 1020 head->read_step = 3; 1021tail_mark: 1022 done = tomoyo_io_printf(head, "\n"); 1023 if (!done) 1024 break; 1025 head->read_step = 1; 1026 if (head->read_single_domain) 1027 break; 1028 } 1029 head->read_eof = done; 1030} 1031 1032/** 1033 * tomoyo_write_domain_profile - Assign profile for specified domain. 1034 * 1035 * @head: Pointer to "struct tomoyo_io_buffer". 1036 * 1037 * Returns 0 on success, -EINVAL otherwise. 1038 * 1039 * This is equivalent to doing 1040 * 1041 * ( echo "select " $domainname; echo "use_profile " $profile ) | 1042 * /usr/sbin/tomoyo-loadpolicy -d 1043 * 1044 * Caller holds tomoyo_read_lock(). 1045 */ 1046static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) 1047{ 1048 char *data = head->write_buf; 1049 char *cp = strchr(data, ' '); 1050 struct tomoyo_domain_info *domain; 1051 unsigned long profile; 1052 1053 if (!cp) 1054 return -EINVAL; 1055 *cp = '\0'; 1056 domain = tomoyo_find_domain(cp + 1); 1057 if (strict_strtoul(data, 10, &profile)) 1058 return -EINVAL; 1059 if (domain && profile < TOMOYO_MAX_PROFILES 1060 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) 1061 domain->profile = (u8) profile; 1062 return 0; 1063} 1064 1065/** 1066 * tomoyo_read_domain_profile - Read only domainname and profile. 1067 * 1068 * @head: Pointer to "struct tomoyo_io_buffer". 1069 * 1070 * Returns list of profile number and domainname pairs. 1071 * 1072 * This is equivalent to doing 1073 * 1074 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | 1075 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) 1076 * domainname = $0; } else if ( $1 == "use_profile" ) { 1077 * print $2 " " domainname; domainname = ""; } } ; ' 1078 * 1079 * Caller holds tomoyo_read_lock(). 1080 */ 1081static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) 1082{ 1083 bool done = true; 1084 1085 if (head->read_eof) 1086 return; 1087 list_for_each_cookie(head->read_var1, &tomoyo_domain_list) { 1088 struct tomoyo_domain_info *domain = 1089 list_entry(head->read_var1, typeof(*domain), list); 1090 if (domain->is_deleted) 1091 continue; 1092 done = tomoyo_io_printf(head, "%u %s\n", domain->profile, 1093 domain->domainname->name); 1094 if (!done) 1095 break; 1096 } 1097 head->read_eof = done; 1098} 1099 1100/** 1101 * tomoyo_write_pid: Specify PID to obtain domainname. 1102 * 1103 * @head: Pointer to "struct tomoyo_io_buffer". 1104 * 1105 * Returns 0. 1106 */ 1107static int tomoyo_write_pid(struct tomoyo_io_buffer *head) 1108{ 1109 unsigned long pid; 1110 /* No error check. */ 1111 strict_strtoul(head->write_buf, 10, &pid); 1112 head->read_step = (int) pid; 1113 head->read_eof = false; 1114 return 0; 1115} 1116 1117/** 1118 * tomoyo_read_pid - Get domainname of the specified PID. 1119 * 1120 * @head: Pointer to "struct tomoyo_io_buffer". 1121 * 1122 * Returns the domainname which the specified PID is in on success, 1123 * empty string otherwise. 1124 * The PID is specified by tomoyo_write_pid() so that the user can obtain 1125 * using read()/write() interface rather than sysctl() interface. 1126 */ 1127static void tomoyo_read_pid(struct tomoyo_io_buffer *head) 1128{ 1129 if (head->read_avail == 0 && !head->read_eof) { 1130 const int pid = head->read_step; 1131 struct task_struct *p; 1132 struct tomoyo_domain_info *domain = NULL; 1133 rcu_read_lock(); 1134 read_lock(&tasklist_lock); 1135 p = find_task_by_vpid(pid); 1136 if (p) 1137 domain = tomoyo_real_domain(p); 1138 read_unlock(&tasklist_lock); 1139 rcu_read_unlock(); 1140 if (domain) 1141 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, 1142 domain->domainname->name); 1143 head->read_eof = true; 1144 } 1145} 1146 1147static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { 1148 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] 1149 = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN, 1150 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] 1151 = TOMOYO_KEYWORD_INITIALIZE_DOMAIN, 1152 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN, 1153 [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN 1154}; 1155 1156/** 1157 * tomoyo_write_exception_policy - Write exception policy. 1158 * 1159 * @head: Pointer to "struct tomoyo_io_buffer". 1160 * 1161 * Returns 0 on success, negative value otherwise. 1162 * 1163 * Caller holds tomoyo_read_lock(). 1164 */ 1165static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) 1166{ 1167 char *data = head->write_buf; 1168 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); 1169 u8 i; 1170 1171 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) { 1172 if (tomoyo_str_starts(&data, tomoyo_transition_type[i])) 1173 return tomoyo_write_transition_control(data, is_delete, 1174 i); 1175 } 1176 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR)) 1177 return tomoyo_write_aggregator_policy(data, is_delete); 1178 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) 1179 return tomoyo_write_globally_readable_policy(data, is_delete); 1180 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) 1181 return tomoyo_write_pattern_policy(data, is_delete); 1182 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) 1183 return tomoyo_write_no_rewrite_policy(data, is_delete); 1184 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) 1185 return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP); 1186 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) 1187 return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP); 1188 return -EINVAL; 1189} 1190 1191static void tomoyo_print_number(char *buffer, int buffer_len, 1192 const struct tomoyo_number_union *ptr) 1193{ 1194 int i; 1195 unsigned long min = ptr->values[0]; 1196 const unsigned long max = ptr->values[1]; 1197 u8 min_type = ptr->min_type; 1198 const u8 max_type = ptr->max_type; 1199 memset(buffer, 0, buffer_len); 1200 buffer_len -= 2; 1201 for (i = 0; i < 2; i++) { 1202 int len; 1203 switch (min_type) { 1204 case TOMOYO_VALUE_TYPE_HEXADECIMAL: 1205 snprintf(buffer, buffer_len, "0x%lX", min); 1206 break; 1207 case TOMOYO_VALUE_TYPE_OCTAL: 1208 snprintf(buffer, buffer_len, "0%lo", min); 1209 break; 1210 default: 1211 snprintf(buffer, buffer_len, "%lu", min); 1212 break; 1213 } 1214 if (min == max && min_type == max_type) 1215 break; 1216 len = strlen(buffer); 1217 buffer[len++] = '-'; 1218 buffer += len; 1219 buffer_len -= len; 1220 min_type = max_type; 1221 min = max; 1222 } 1223} 1224 1225static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { 1226 [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP, 1227 [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP 1228}; 1229 1230/** 1231 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list. 1232 * 1233 * @head: Pointer to "struct tomoyo_io_buffer". 1234 * @idx: Index number. 1235 * 1236 * Returns true on success, false otherwise. 1237 * 1238 * Caller holds tomoyo_read_lock(). 1239 */ 1240static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) 1241{ 1242 const char *w[3] = { "", "", "" }; 1243 w[0] = tomoyo_group_name[idx]; 1244 list_for_each_cookie(head->read_var1, &tomoyo_group_list[idx]) { 1245 struct tomoyo_group *group = 1246 list_entry(head->read_var1, typeof(*group), list); 1247 w[1] = group->group_name->name; 1248 list_for_each_cookie(head->read_var2, &group->member_list) { 1249 char buffer[128]; 1250 struct tomoyo_acl_head *ptr = 1251 list_entry(head->read_var2, typeof(*ptr), list); 1252 if (ptr->is_deleted) 1253 continue; 1254 if (idx == TOMOYO_PATH_GROUP) { 1255 w[2] = container_of(ptr, 1256 struct tomoyo_path_group, 1257 head)->member_name->name; 1258 } else if (idx == TOMOYO_NUMBER_GROUP) { 1259 tomoyo_print_number(buffer, sizeof(buffer), 1260 &container_of 1261 (ptr, struct 1262 tomoyo_number_group, 1263 head)->number); 1264 w[2] = buffer; 1265 } 1266 if (!tomoyo_io_printf(head, "%s%s %s\n", w[0], w[1], 1267 w[2])) 1268 return false; 1269 } 1270 head->read_var2 = NULL; 1271 } 1272 head->read_var1 = NULL; 1273 return true; 1274} 1275 1276/** 1277 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. 1278 * 1279 * @head: Pointer to "struct tomoyo_io_buffer". 1280 * @idx: Index number. 1281 * 1282 * Returns true on success, false otherwise. 1283 * 1284 * Caller holds tomoyo_read_lock(). 1285 */ 1286static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) 1287{ 1288 list_for_each_cookie(head->read_var2, &tomoyo_policy_list[idx]) { 1289 const char *w[4] = { "", "", "", "" }; 1290 struct tomoyo_acl_head *acl = 1291 container_of(head->read_var2, typeof(*acl), list); 1292 if (acl->is_deleted) 1293 continue; 1294 switch (idx) { 1295 case TOMOYO_ID_TRANSITION_CONTROL: 1296 { 1297 struct tomoyo_transition_control *ptr = 1298 container_of(acl, typeof(*ptr), head); 1299 w[0] = tomoyo_transition_type[ptr->type]; 1300 if (ptr->program) 1301 w[1] = ptr->program->name; 1302 if (ptr->domainname) 1303 w[3] = ptr->domainname->name; 1304 if (w[1][0] && w[3][0]) 1305 w[2] = " from "; 1306 } 1307 break; 1308 case TOMOYO_ID_GLOBALLY_READABLE: 1309 { 1310 struct tomoyo_globally_readable_file_entry *ptr 1311 = container_of(acl, typeof(*ptr), head); 1312 w[0] = TOMOYO_KEYWORD_ALLOW_READ; 1313 w[1] = ptr->filename->name; 1314 } 1315 break; 1316 case TOMOYO_ID_AGGREGATOR: 1317 { 1318 struct tomoyo_aggregator_entry *ptr = 1319 container_of(acl, typeof(*ptr), head); 1320 w[0] = TOMOYO_KEYWORD_AGGREGATOR; 1321 w[1] = ptr->original_name->name; 1322 w[2] = " "; 1323 w[3] = ptr->aggregated_name->name; 1324 } 1325 break; 1326 case TOMOYO_ID_PATTERN: 1327 { 1328 struct tomoyo_pattern_entry *ptr = 1329 container_of(acl, typeof(*ptr), head); 1330 w[0] = TOMOYO_KEYWORD_FILE_PATTERN; 1331 w[1] = ptr->pattern->name; 1332 } 1333 break; 1334 case TOMOYO_ID_NO_REWRITE: 1335 { 1336 struct tomoyo_no_rewrite_entry *ptr = 1337 container_of(acl, typeof(*ptr), head); 1338 w[0] = TOMOYO_KEYWORD_DENY_REWRITE; 1339 w[1] = ptr->pattern->name; 1340 } 1341 break; 1342 default: 1343 continue; 1344 } 1345 if (!tomoyo_io_printf(head, "%s%s%s%s\n", w[0], w[1], w[2], 1346 w[3])) 1347 return false; 1348 } 1349 head->read_var2 = NULL; 1350 return true; 1351} 1352 1353/** 1354 * tomoyo_read_exception_policy - Read exception policy. 1355 * 1356 * @head: Pointer to "struct tomoyo_io_buffer". 1357 * 1358 * Caller holds tomoyo_read_lock(). 1359 */ 1360static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) 1361{ 1362 if (head->read_eof) 1363 return; 1364 while (head->read_step < TOMOYO_MAX_POLICY && 1365 tomoyo_read_policy(head, head->read_step)) 1366 head->read_step++; 1367 if (head->read_step < TOMOYO_MAX_POLICY) 1368 return; 1369 while (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && 1370 tomoyo_read_group(head, head->read_step - TOMOYO_MAX_POLICY)) 1371 head->read_step++; 1372 if (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) 1373 return; 1374 head->read_eof = true; 1375} 1376 1377/** 1378 * tomoyo_print_header - Get header line of audit log. 1379 * 1380 * @r: Pointer to "struct tomoyo_request_info". 1381 * 1382 * Returns string representation. 1383 * 1384 * This function uses kmalloc(), so caller must kfree() if this function 1385 * didn't return NULL. 1386 */ 1387static char *tomoyo_print_header(struct tomoyo_request_info *r) 1388{ 1389 static const char *tomoyo_mode_4[4] = { 1390 "disabled", "learning", "permissive", "enforcing" 1391 }; 1392 struct timeval tv; 1393 const pid_t gpid = task_pid_nr(current); 1394 static const int tomoyo_buffer_len = 4096; 1395 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); 1396 if (!buffer) 1397 return NULL; 1398 do_gettimeofday(&tv); 1399 snprintf(buffer, tomoyo_buffer_len - 1, 1400 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" 1401 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" 1402 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", 1403 tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, 1404 (pid_t) sys_getpid(), (pid_t) sys_getppid(), 1405 current_uid(), current_gid(), current_euid(), 1406 current_egid(), current_suid(), current_sgid(), 1407 current_fsuid(), current_fsgid()); 1408 return buffer; 1409} 1410 1411/** 1412 * tomoyo_init_audit_log - Allocate buffer for audit logs. 1413 * 1414 * @len: Required size. 1415 * @r: Pointer to "struct tomoyo_request_info". 1416 * 1417 * Returns pointer to allocated memory. 1418 * 1419 * The @len is updated to add the header lines' size on success. 1420 * 1421 * This function uses kzalloc(), so caller must kfree() if this function 1422 * didn't return NULL. 1423 */ 1424static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) 1425{ 1426 char *buf = NULL; 1427 const char *header; 1428 const char *domainname; 1429 if (!r->domain) 1430 r->domain = tomoyo_domain(); 1431 domainname = r->domain->domainname->name; 1432 header = tomoyo_print_header(r); 1433 if (!header) 1434 return NULL; 1435 *len += strlen(domainname) + strlen(header) + 10; 1436 buf = kzalloc(*len, GFP_NOFS); 1437 if (buf) 1438 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); 1439 kfree(header); 1440 return buf; 1441} 1442 1443/* Wait queue for tomoyo_query_list. */ 1444static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); 1445 1446/* Lock for manipulating tomoyo_query_list. */ 1447static DEFINE_SPINLOCK(tomoyo_query_list_lock); 1448 1449/* Structure for query. */ 1450struct tomoyo_query_entry { 1451 struct list_head list; 1452 char *query; 1453 int query_len; 1454 unsigned int serial; 1455 int timer; 1456 int answer; 1457}; 1458 1459/* The list for "struct tomoyo_query_entry". */ 1460static LIST_HEAD(tomoyo_query_list); 1461 1462/* 1463 * Number of "struct file" referring /sys/kernel/security/tomoyo/query 1464 * interface. 1465 */ 1466static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); 1467 1468/** 1469 * tomoyo_supervisor - Ask for the supervisor's decision. 1470 * 1471 * @r: Pointer to "struct tomoyo_request_info". 1472 * @fmt: The printf()'s format string, followed by parameters. 1473 * 1474 * Returns 0 if the supervisor decided to permit the access request which 1475 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the 1476 * supervisor decided to retry the access request which violated the policy in 1477 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. 1478 */ 1479int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) 1480{ 1481 va_list args; 1482 int error = -EPERM; 1483 int pos; 1484 int len; 1485 static unsigned int tomoyo_serial; 1486 struct tomoyo_query_entry *tomoyo_query_entry = NULL; 1487 bool quota_exceeded = false; 1488 char *header; 1489 switch (r->mode) { 1490 char *buffer; 1491 case TOMOYO_CONFIG_LEARNING: 1492 if (!tomoyo_domain_quota_is_ok(r)) 1493 return 0; 1494 va_start(args, fmt); 1495 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; 1496 va_end(args); 1497 buffer = kmalloc(len, GFP_NOFS); 1498 if (!buffer) 1499 return 0; 1500 va_start(args, fmt); 1501 vsnprintf(buffer, len - 1, fmt, args); 1502 va_end(args); 1503 tomoyo_normalize_line(buffer); 1504 tomoyo_write_domain_policy2(buffer, r->domain, false); 1505 kfree(buffer); 1506 /* fall through */ 1507 case TOMOYO_CONFIG_PERMISSIVE: 1508 return 0; 1509 } 1510 if (!r->domain) 1511 r->domain = tomoyo_domain(); 1512 if (!atomic_read(&tomoyo_query_observers)) 1513 return -EPERM; 1514 va_start(args, fmt); 1515 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; 1516 va_end(args); 1517 header = tomoyo_init_audit_log(&len, r); 1518 if (!header) 1519 goto out; 1520 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); 1521 if (!tomoyo_query_entry) 1522 goto out; 1523 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); 1524 if (!tomoyo_query_entry->query) 1525 goto out; 1526 len = ksize(tomoyo_query_entry->query); 1527 INIT_LIST_HEAD(&tomoyo_query_entry->list); 1528 spin_lock(&tomoyo_query_list_lock); 1529 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + 1530 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { 1531 quota_exceeded = true; 1532 } else { 1533 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); 1534 tomoyo_query_entry->serial = tomoyo_serial++; 1535 } 1536 spin_unlock(&tomoyo_query_list_lock); 1537 if (quota_exceeded) 1538 goto out; 1539 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", 1540 tomoyo_query_entry->serial, r->retry, header); 1541 kfree(header); 1542 header = NULL; 1543 va_start(args, fmt); 1544 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); 1545 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; 1546 va_end(args); 1547 spin_lock(&tomoyo_query_list_lock); 1548 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); 1549 spin_unlock(&tomoyo_query_list_lock); 1550 /* Give 10 seconds for supervisor's opinion. */ 1551 for (tomoyo_query_entry->timer = 0; 1552 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; 1553 tomoyo_query_entry->timer++) { 1554 wake_up(&tomoyo_query_wait); 1555 set_current_state(TASK_INTERRUPTIBLE); 1556 schedule_timeout(HZ / 10); 1557 if (tomoyo_query_entry->answer) 1558 break; 1559 } 1560 spin_lock(&tomoyo_query_list_lock); 1561 list_del(&tomoyo_query_entry->list); 1562 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); 1563 spin_unlock(&tomoyo_query_list_lock); 1564 switch (tomoyo_query_entry->answer) { 1565 case 3: /* Asked to retry by administrator. */ 1566 error = TOMOYO_RETRY_REQUEST; 1567 r->retry++; 1568 break; 1569 case 1: 1570 /* Granted by administrator. */ 1571 error = 0; 1572 break; 1573 case 0: 1574 /* Timed out. */ 1575 break; 1576 default: 1577 /* Rejected by administrator. */ 1578 break; 1579 } 1580 out: 1581 if (tomoyo_query_entry) 1582 kfree(tomoyo_query_entry->query); 1583 kfree(tomoyo_query_entry); 1584 kfree(header); 1585 return error; 1586} 1587 1588/** 1589 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. 1590 * 1591 * @file: Pointer to "struct file". 1592 * @wait: Pointer to "poll_table". 1593 * 1594 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. 1595 * 1596 * Waits for access requests which violated policy in enforcing mode. 1597 */ 1598static int tomoyo_poll_query(struct file *file, poll_table *wait) 1599{ 1600 struct list_head *tmp; 1601 bool found = false; 1602 u8 i; 1603 for (i = 0; i < 2; i++) { 1604 spin_lock(&tomoyo_query_list_lock); 1605 list_for_each(tmp, &tomoyo_query_list) { 1606 struct tomoyo_query_entry *ptr 1607 = list_entry(tmp, struct tomoyo_query_entry, 1608 list); 1609 if (ptr->answer) 1610 continue; 1611 found = true; 1612 break; 1613 } 1614 spin_unlock(&tomoyo_query_list_lock); 1615 if (found) 1616 return POLLIN | POLLRDNORM; 1617 if (i) 1618 break; 1619 poll_wait(file, &tomoyo_query_wait, wait); 1620 } 1621 return 0; 1622} 1623 1624/** 1625 * tomoyo_read_query - Read access requests which violated policy in enforcing mode. 1626 * 1627 * @head: Pointer to "struct tomoyo_io_buffer". 1628 */ 1629static void tomoyo_read_query(struct tomoyo_io_buffer *head) 1630{ 1631 struct list_head *tmp; 1632 int pos = 0; 1633 int len = 0; 1634 char *buf; 1635 if (head->read_avail) 1636 return; 1637 if (head->read_buf) { 1638 kfree(head->read_buf); 1639 head->read_buf = NULL; 1640 head->readbuf_size = 0; 1641 } 1642 spin_lock(&tomoyo_query_list_lock); 1643 list_for_each(tmp, &tomoyo_query_list) { 1644 struct tomoyo_query_entry *ptr 1645 = list_entry(tmp, struct tomoyo_query_entry, list); 1646 if (ptr->answer) 1647 continue; 1648 if (pos++ != head->read_step) 1649 continue; 1650 len = ptr->query_len; 1651 break; 1652 } 1653 spin_unlock(&tomoyo_query_list_lock); 1654 if (!len) { 1655 head->read_step = 0; 1656 return; 1657 } 1658 buf = kzalloc(len, GFP_NOFS); 1659 if (!buf) 1660 return; 1661 pos = 0; 1662 spin_lock(&tomoyo_query_list_lock); 1663 list_for_each(tmp, &tomoyo_query_list) { 1664 struct tomoyo_query_entry *ptr 1665 = list_entry(tmp, struct tomoyo_query_entry, list); 1666 if (ptr->answer) 1667 continue; 1668 if (pos++ != head->read_step) 1669 continue; 1670 /* 1671 * Some query can be skipped because tomoyo_query_list 1672 * can change, but I don't care. 1673 */ 1674 if (len == ptr->query_len) 1675 memmove(buf, ptr->query, len); 1676 break; 1677 } 1678 spin_unlock(&tomoyo_query_list_lock); 1679 if (buf[0]) { 1680 head->read_avail = len; 1681 head->readbuf_size = head->read_avail; 1682 head->read_buf = buf; 1683 head->read_step++; 1684 } else { 1685 kfree(buf); 1686 } 1687} 1688 1689/** 1690 * tomoyo_write_answer - Write the supervisor's decision. 1691 * 1692 * @head: Pointer to "struct tomoyo_io_buffer". 1693 * 1694 * Returns 0 on success, -EINVAL otherwise. 1695 */ 1696static int tomoyo_write_answer(struct tomoyo_io_buffer *head) 1697{ 1698 char *data = head->write_buf; 1699 struct list_head *tmp; 1700 unsigned int serial; 1701 unsigned int answer; 1702 spin_lock(&tomoyo_query_list_lock); 1703 list_for_each(tmp, &tomoyo_query_list) { 1704 struct tomoyo_query_entry *ptr 1705 = list_entry(tmp, struct tomoyo_query_entry, list); 1706 ptr->timer = 0; 1707 } 1708 spin_unlock(&tomoyo_query_list_lock); 1709 if (sscanf(data, "A%u=%u", &serial, &answer) != 2) 1710 return -EINVAL; 1711 spin_lock(&tomoyo_query_list_lock); 1712 list_for_each(tmp, &tomoyo_query_list) { 1713 struct tomoyo_query_entry *ptr 1714 = list_entry(tmp, struct tomoyo_query_entry, list); 1715 if (ptr->serial != serial) 1716 continue; 1717 if (!ptr->answer) 1718 ptr->answer = answer; 1719 break; 1720 } 1721 spin_unlock(&tomoyo_query_list_lock); 1722 return 0; 1723} 1724 1725/** 1726 * tomoyo_read_version: Get version. 1727 * 1728 * @head: Pointer to "struct tomoyo_io_buffer". 1729 * 1730 * Returns version information. 1731 */ 1732static void tomoyo_read_version(struct tomoyo_io_buffer *head) 1733{ 1734 if (!head->read_eof) { 1735 tomoyo_io_printf(head, "2.3.0-pre"); 1736 head->read_eof = true; 1737 } 1738} 1739 1740/** 1741 * tomoyo_read_self_domain - Get the current process's domainname. 1742 * 1743 * @head: Pointer to "struct tomoyo_io_buffer". 1744 * 1745 * Returns the current process's domainname. 1746 */ 1747static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head) 1748{ 1749 if (!head->read_eof) { 1750 /* 1751 * tomoyo_domain()->domainname != NULL 1752 * because every process belongs to a domain and 1753 * the domain's name cannot be NULL. 1754 */ 1755 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); 1756 head->read_eof = true; 1757 } 1758} 1759 1760/** 1761 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. 1762 * 1763 * @type: Type of interface. 1764 * @file: Pointer to "struct file". 1765 * 1766 * Associates policy handler and returns 0 on success, -ENOMEM otherwise. 1767 * 1768 * Caller acquires tomoyo_read_lock(). 1769 */ 1770int tomoyo_open_control(const u8 type, struct file *file) 1771{ 1772 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 1773 1774 if (!head) 1775 return -ENOMEM; 1776 mutex_init(&head->io_sem); 1777 head->type = type; 1778 switch (type) { 1779 case TOMOYO_DOMAINPOLICY: 1780 /* /sys/kernel/security/tomoyo/domain_policy */ 1781 head->write = tomoyo_write_domain_policy; 1782 head->read = tomoyo_read_domain_policy; 1783 break; 1784 case TOMOYO_EXCEPTIONPOLICY: 1785 /* /sys/kernel/security/tomoyo/exception_policy */ 1786 head->write = tomoyo_write_exception_policy; 1787 head->read = tomoyo_read_exception_policy; 1788 break; 1789 case TOMOYO_SELFDOMAIN: 1790 /* /sys/kernel/security/tomoyo/self_domain */ 1791 head->read = tomoyo_read_self_domain; 1792 break; 1793 case TOMOYO_DOMAIN_STATUS: 1794 /* /sys/kernel/security/tomoyo/.domain_status */ 1795 head->write = tomoyo_write_domain_profile; 1796 head->read = tomoyo_read_domain_profile; 1797 break; 1798 case TOMOYO_PROCESS_STATUS: 1799 /* /sys/kernel/security/tomoyo/.process_status */ 1800 head->write = tomoyo_write_pid; 1801 head->read = tomoyo_read_pid; 1802 break; 1803 case TOMOYO_VERSION: 1804 /* /sys/kernel/security/tomoyo/version */ 1805 head->read = tomoyo_read_version; 1806 head->readbuf_size = 128; 1807 break; 1808 case TOMOYO_MEMINFO: 1809 /* /sys/kernel/security/tomoyo/meminfo */ 1810 head->write = tomoyo_write_memory_quota; 1811 head->read = tomoyo_read_memory_counter; 1812 head->readbuf_size = 512; 1813 break; 1814 case TOMOYO_PROFILE: 1815 /* /sys/kernel/security/tomoyo/profile */ 1816 head->write = tomoyo_write_profile; 1817 head->read = tomoyo_read_profile; 1818 break; 1819 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ 1820 head->poll = tomoyo_poll_query; 1821 head->write = tomoyo_write_answer; 1822 head->read = tomoyo_read_query; 1823 break; 1824 case TOMOYO_MANAGER: 1825 /* /sys/kernel/security/tomoyo/manager */ 1826 head->write = tomoyo_write_manager_policy; 1827 head->read = tomoyo_read_manager_policy; 1828 break; 1829 } 1830 if (!(file->f_mode & FMODE_READ)) { 1831 /* 1832 * No need to allocate read_buf since it is not opened 1833 * for reading. 1834 */ 1835 head->read = NULL; 1836 head->poll = NULL; 1837 } else if (!head->poll) { 1838 /* Don't allocate read_buf for poll() access. */ 1839 if (!head->readbuf_size) 1840 head->readbuf_size = 4096 * 2; 1841 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); 1842 if (!head->read_buf) { 1843 kfree(head); 1844 return -ENOMEM; 1845 } 1846 } 1847 if (!(file->f_mode & FMODE_WRITE)) { 1848 /* 1849 * No need to allocate write_buf since it is not opened 1850 * for writing. 1851 */ 1852 head->write = NULL; 1853 } else if (head->write) { 1854 head->writebuf_size = 4096 * 2; 1855 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); 1856 if (!head->write_buf) { 1857 kfree(head->read_buf); 1858 kfree(head); 1859 return -ENOMEM; 1860 } 1861 } 1862 if (type != TOMOYO_QUERY) 1863 head->reader_idx = tomoyo_read_lock(); 1864 file->private_data = head; 1865 /* 1866 * Call the handler now if the file is 1867 * /sys/kernel/security/tomoyo/self_domain 1868 * so that the user can use 1869 * cat < /sys/kernel/security/tomoyo/self_domain" 1870 * to know the current process's domainname. 1871 */ 1872 if (type == TOMOYO_SELFDOMAIN) 1873 tomoyo_read_control(file, NULL, 0); 1874 /* 1875 * If the file is /sys/kernel/security/tomoyo/query , increment the 1876 * observer counter. 1877 * The obserber counter is used by tomoyo_supervisor() to see if 1878 * there is some process monitoring /sys/kernel/security/tomoyo/query. 1879 */ 1880 else if (type == TOMOYO_QUERY) 1881 atomic_inc(&tomoyo_query_observers); 1882 return 0; 1883} 1884 1885/** 1886 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. 1887 * 1888 * @file: Pointer to "struct file". 1889 * @wait: Pointer to "poll_table". 1890 * 1891 * Waits for read readiness. 1892 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . 1893 */ 1894int tomoyo_poll_control(struct file *file, poll_table *wait) 1895{ 1896 struct tomoyo_io_buffer *head = file->private_data; 1897 if (!head->poll) 1898 return -ENOSYS; 1899 return head->poll(file, wait); 1900} 1901 1902/** 1903 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. 1904 * 1905 * @file: Pointer to "struct file". 1906 * @buffer: Poiner to buffer to write to. 1907 * @buffer_len: Size of @buffer. 1908 * 1909 * Returns bytes read on success, negative value otherwise. 1910 * 1911 * Caller holds tomoyo_read_lock(). 1912 */ 1913int tomoyo_read_control(struct file *file, char __user *buffer, 1914 const int buffer_len) 1915{ 1916 int len = 0; 1917 struct tomoyo_io_buffer *head = file->private_data; 1918 char *cp; 1919 1920 if (!head->read) 1921 return -ENOSYS; 1922 if (mutex_lock_interruptible(&head->io_sem)) 1923 return -EINTR; 1924 /* Call the policy handler. */ 1925 head->read(head); 1926 if (len < 0) 1927 goto out; 1928 /* Write to buffer. */ 1929 len = head->read_avail; 1930 if (len > buffer_len) 1931 len = buffer_len; 1932 if (!len) 1933 goto out; 1934 /* head->read_buf changes by some functions. */ 1935 cp = head->read_buf; 1936 if (copy_to_user(buffer, cp, len)) { 1937 len = -EFAULT; 1938 goto out; 1939 } 1940 head->read_avail -= len; 1941 memmove(cp, cp + len, head->read_avail); 1942 out: 1943 mutex_unlock(&head->io_sem); 1944 return len; 1945} 1946 1947/** 1948 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. 1949 * 1950 * @file: Pointer to "struct file". 1951 * @buffer: Pointer to buffer to read from. 1952 * @buffer_len: Size of @buffer. 1953 * 1954 * Returns @buffer_len on success, negative value otherwise. 1955 * 1956 * Caller holds tomoyo_read_lock(). 1957 */ 1958int tomoyo_write_control(struct file *file, const char __user *buffer, 1959 const int buffer_len) 1960{ 1961 struct tomoyo_io_buffer *head = file->private_data; 1962 int error = buffer_len; 1963 int avail_len = buffer_len; 1964 char *cp0 = head->write_buf; 1965 1966 if (!head->write) 1967 return -ENOSYS; 1968 if (!access_ok(VERIFY_READ, buffer, buffer_len)) 1969 return -EFAULT; 1970 /* Don't allow updating policies by non manager programs. */ 1971 if (head->write != tomoyo_write_pid && 1972 head->write != tomoyo_write_domain_policy && 1973 !tomoyo_policy_manager()) 1974 return -EPERM; 1975 if (mutex_lock_interruptible(&head->io_sem)) 1976 return -EINTR; 1977 /* Read a line and dispatch it to the policy handler. */ 1978 while (avail_len > 0) { 1979 char c; 1980 if (head->write_avail >= head->writebuf_size - 1) { 1981 error = -ENOMEM; 1982 break; 1983 } else if (get_user(c, buffer)) { 1984 error = -EFAULT; 1985 break; 1986 } 1987 buffer++; 1988 avail_len--; 1989 cp0[head->write_avail++] = c; 1990 if (c != '\n') 1991 continue; 1992 cp0[head->write_avail - 1] = '\0'; 1993 head->write_avail = 0; 1994 tomoyo_normalize_line(cp0); 1995 head->write(head); 1996 } 1997 mutex_unlock(&head->io_sem); 1998 return error; 1999} 2000 2001/** 2002 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. 2003 * 2004 * @file: Pointer to "struct file". 2005 * 2006 * Releases memory and returns 0. 2007 * 2008 * Caller looses tomoyo_read_lock(). 2009 */ 2010int tomoyo_close_control(struct file *file) 2011{ 2012 struct tomoyo_io_buffer *head = file->private_data; 2013 const bool is_write = !!head->write_buf; 2014 2015 /* 2016 * If the file is /sys/kernel/security/tomoyo/query , decrement the 2017 * observer counter. 2018 */ 2019 if (head->type == TOMOYO_QUERY) 2020 atomic_dec(&tomoyo_query_observers); 2021 else 2022 tomoyo_read_unlock(head->reader_idx); 2023 /* Release memory used for policy I/O. */ 2024 kfree(head->read_buf); 2025 head->read_buf = NULL; 2026 kfree(head->write_buf); 2027 head->write_buf = NULL; 2028 kfree(head); 2029 head = NULL; 2030 file->private_data = NULL; 2031 if (is_write) 2032 tomoyo_run_gc(); 2033 return 0; 2034} 2035 2036/** 2037 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. 2038 */ 2039void tomoyo_check_profile(void) 2040{ 2041 struct tomoyo_domain_info *domain; 2042 const int idx = tomoyo_read_lock(); 2043 tomoyo_policy_loaded = true; 2044 /* Check all profiles currently assigned to domains are defined. */ 2045 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { 2046 const u8 profile = domain->profile; 2047 if (tomoyo_profile_ptr[profile]) 2048 continue; 2049 panic("Profile %u (used by '%s') not defined.\n", 2050 profile, domain->domainname->name); 2051 } 2052 tomoyo_read_unlock(idx); 2053 if (tomoyo_profile_version != 20090903) 2054 panic("Profile version %u is not supported.\n", 2055 tomoyo_profile_version); 2056 printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n"); 2057 printk(KERN_INFO "Mandatory Access Control activated.\n"); 2058} 2059