1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Security plug functions 4 * 5 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com> 6 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 7 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com> 8 * Copyright (C) 2016 Mellanox Technologies 9 */ 10 11 #define pr_fmt(fmt) "LSM: " fmt 12 13 #include <linux/bpf.h> 14 #include <linux/capability.h> 15 #include <linux/dcache.h> 16 #include <linux/export.h> 17 #include <linux/init.h> 18 #include <linux/kernel.h> 19 #include <linux/kernel_read_file.h> 20 #include <linux/lsm_hooks.h> 21 #include <linux/integrity.h> 22 #include <linux/ima.h> 23 #include <linux/evm.h> 24 #include <linux/fsnotify.h> 25 #include <linux/mman.h> 26 #include <linux/mount.h> 27 #include <linux/personality.h> 28 #include <linux/backing-dev.h> 29 #include <linux/string.h> 30 #include <linux/msg.h> 31 #include <net/flow.h> 32 33 #define MAX_LSM_EVM_XATTR 2 34 35 /* How many LSMs were built into the kernel? */ 36 #define LSM_COUNT (__end_lsm_info - __start_lsm_info) 37 38 /* 39 * These are descriptions of the reasons that can be passed to the 40 * security_locked_down() LSM hook. Placing this array here allows 41 * all security modules to use the same descriptions for auditing 42 * purposes. 43 */ 44 const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1] = { 45 [LOCKDOWN_NONE] = "none", 46 [LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading", 47 [LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port", 48 [LOCKDOWN_EFI_TEST] = "/dev/efi_test access", 49 [LOCKDOWN_KEXEC] = "kexec of unsigned images", 50 [LOCKDOWN_HIBERNATION] = "hibernation", 51 [LOCKDOWN_PCI_ACCESS] = "direct PCI access", 52 [LOCKDOWN_IOPORT] = "raw io port access", 53 [LOCKDOWN_MSR] = "raw MSR access", 54 [LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables", 55 [LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage", 56 [LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO", 57 [LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters", 58 [LOCKDOWN_MMIOTRACE] = "unsafe mmio", 59 [LOCKDOWN_DEBUGFS] = "debugfs access", 60 [LOCKDOWN_XMON_WR] = "xmon write access", 61 [LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM", 62 [LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM", 63 [LOCKDOWN_INTEGRITY_MAX] = "integrity", 64 [LOCKDOWN_KCORE] = "/proc/kcore access", 65 [LOCKDOWN_KPROBES] = "use of kprobes", 66 [LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM", 67 [LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM", 68 [LOCKDOWN_PERF] = "unsafe use of perf", 69 [LOCKDOWN_TRACEFS] = "use of tracefs", 70 [LOCKDOWN_XMON_RW] = "xmon read and write access", 71 [LOCKDOWN_XFRM_SECRET] = "xfrm SA secret", 72 [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality", 73 }; 74 75 struct security_hook_heads security_hook_heads __lsm_ro_after_init; 76 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain); 77 78 static struct kmem_cache *lsm_file_cache; 79 static struct kmem_cache *lsm_inode_cache; 80 81 char *lsm_names; 82 static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init; 83 84 /* Boot-time LSM user choice */ 85 static __initdata const char *chosen_lsm_order; 86 static __initdata const char *chosen_major_lsm; 87 88 static __initconst const char * const builtin_lsm_order = CONFIG_LSM; 89 90 /* Ordered list of LSMs to initialize. */ 91 static __initdata struct lsm_info **ordered_lsms; 92 static __initdata struct lsm_info *exclusive; 93 94 static __initdata bool debug; 95 #define init_debug(...) \ 96 do { \ 97 if (debug) \ 98 pr_info(__VA_ARGS__); \ 99 } while (0) 100 101 static bool __init is_enabled(struct lsm_info *lsm) 102 { 103 if (!lsm->enabled) 104 return false; 105 106 return *lsm->enabled; 107 } 108 109 /* Mark an LSM's enabled flag. */ 110 static int lsm_enabled_true __initdata = 1; 111 static int lsm_enabled_false __initdata = 0; 112 static void __init set_enabled(struct lsm_info *lsm, bool enabled) 113 { 114 /* 115 * When an LSM hasn't configured an enable variable, we can use 116 * a hard-coded location for storing the default enabled state. 117 */ 118 if (!lsm->enabled) { 119 if (enabled) 120 lsm->enabled = &lsm_enabled_true; 121 else 122 lsm->enabled = &lsm_enabled_false; 123 } else if (lsm->enabled == &lsm_enabled_true) { 124 if (!enabled) 125 lsm->enabled = &lsm_enabled_false; 126 } else if (lsm->enabled == &lsm_enabled_false) { 127 if (enabled) 128 lsm->enabled = &lsm_enabled_true; 129 } else { 130 *lsm->enabled = enabled; 131 } 132 } 133 134 /* Is an LSM already listed in the ordered LSMs list? */ 135 static bool __init exists_ordered_lsm(struct lsm_info *lsm) 136 { 137 struct lsm_info **check; 138 139 for (check = ordered_lsms; *check; check++) 140 if (*check == lsm) 141 return true; 142 143 return false; 144 } 145 146 /* Append an LSM to the list of ordered LSMs to initialize. */ 147 static int last_lsm __initdata; 148 static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from) 149 { 150 /* Ignore duplicate selections. */ 151 if (exists_ordered_lsm(lsm)) 152 return; 153 154 if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from)) 155 return; 156 157 /* Enable this LSM, if it is not already set. */ 158 if (!lsm->enabled) 159 lsm->enabled = &lsm_enabled_true; 160 ordered_lsms[last_lsm++] = lsm; 161 162 init_debug("%s ordering: %s (%sabled)\n", from, lsm->name, 163 is_enabled(lsm) ? "en" : "dis"); 164 } 165 166 /* Is an LSM allowed to be initialized? */ 167 static bool __init lsm_allowed(struct lsm_info *lsm) 168 { 169 /* Skip if the LSM is disabled. */ 170 if (!is_enabled(lsm)) 171 return false; 172 173 /* Not allowed if another exclusive LSM already initialized. */ 174 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) { 175 init_debug("exclusive disabled: %s\n", lsm->name); 176 return false; 177 } 178 179 return true; 180 } 181 182 static void __init lsm_set_blob_size(int *need, int *lbs) 183 { 184 int offset; 185 186 if (*need > 0) { 187 offset = *lbs; 188 *lbs += *need; 189 *need = offset; 190 } 191 } 192 193 static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed) 194 { 195 if (!needed) 196 return; 197 198 lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred); 199 lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file); 200 /* 201 * The inode blob gets an rcu_head in addition to 202 * what the modules might need. 203 */ 204 if (needed->lbs_inode && blob_sizes.lbs_inode == 0) 205 blob_sizes.lbs_inode = sizeof(struct rcu_head); 206 lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode); 207 lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc); 208 lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg); 209 lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock); 210 lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task); 211 } 212 213 /* Prepare LSM for initialization. */ 214 static void __init prepare_lsm(struct lsm_info *lsm) 215 { 216 int enabled = lsm_allowed(lsm); 217 218 /* Record enablement (to handle any following exclusive LSMs). */ 219 set_enabled(lsm, enabled); 220 221 /* If enabled, do pre-initialization work. */ 222 if (enabled) { 223 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) { 224 exclusive = lsm; 225 init_debug("exclusive chosen: %s\n", lsm->name); 226 } 227 228 lsm_set_blob_sizes(lsm->blobs); 229 } 230 } 231 232 /* Initialize a given LSM, if it is enabled. */ 233 static void __init initialize_lsm(struct lsm_info *lsm) 234 { 235 if (is_enabled(lsm)) { 236 int ret; 237 238 init_debug("initializing %s\n", lsm->name); 239 ret = lsm->init(); 240 WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret); 241 } 242 } 243 244 /* Populate ordered LSMs list from comma-separated LSM name list. */ 245 static void __init ordered_lsm_parse(const char *order, const char *origin) 246 { 247 struct lsm_info *lsm; 248 char *sep, *name, *next; 249 250 /* LSM_ORDER_FIRST is always first. */ 251 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 252 if (lsm->order == LSM_ORDER_FIRST) 253 append_ordered_lsm(lsm, "first"); 254 } 255 256 /* Process "security=", if given. */ 257 if (chosen_major_lsm) { 258 struct lsm_info *major; 259 260 /* 261 * To match the original "security=" behavior, this 262 * explicitly does NOT fallback to another Legacy Major 263 * if the selected one was separately disabled: disable 264 * all non-matching Legacy Major LSMs. 265 */ 266 for (major = __start_lsm_info; major < __end_lsm_info; 267 major++) { 268 if ((major->flags & LSM_FLAG_LEGACY_MAJOR) && 269 strcmp(major->name, chosen_major_lsm) != 0) { 270 set_enabled(major, false); 271 init_debug("security=%s disabled: %s\n", 272 chosen_major_lsm, major->name); 273 } 274 } 275 } 276 277 sep = kstrdup(order, GFP_KERNEL); 278 next = sep; 279 /* Walk the list, looking for matching LSMs. */ 280 while ((name = strsep(&next, ",")) != NULL) { 281 bool found = false; 282 283 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 284 if (lsm->order == LSM_ORDER_MUTABLE && 285 strcmp(lsm->name, name) == 0) { 286 append_ordered_lsm(lsm, origin); 287 found = true; 288 } 289 } 290 291 if (!found) 292 init_debug("%s ignored: %s\n", origin, name); 293 } 294 295 /* Process "security=", if given. */ 296 if (chosen_major_lsm) { 297 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 298 if (exists_ordered_lsm(lsm)) 299 continue; 300 if (strcmp(lsm->name, chosen_major_lsm) == 0) 301 append_ordered_lsm(lsm, "security="); 302 } 303 } 304 305 /* Disable all LSMs not in the ordered list. */ 306 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 307 if (exists_ordered_lsm(lsm)) 308 continue; 309 set_enabled(lsm, false); 310 init_debug("%s disabled: %s\n", origin, lsm->name); 311 } 312 313 kfree(sep); 314 } 315 316 static void __init lsm_early_cred(struct cred *cred); 317 static void __init lsm_early_task(struct task_struct *task); 318 319 static int lsm_append(const char *new, char **result); 320 321 static void __init ordered_lsm_init(void) 322 { 323 struct lsm_info **lsm; 324 325 ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms), 326 GFP_KERNEL); 327 328 if (chosen_lsm_order) { 329 if (chosen_major_lsm) { 330 pr_info("security= is ignored because it is superseded by lsm=\n"); 331 chosen_major_lsm = NULL; 332 } 333 ordered_lsm_parse(chosen_lsm_order, "cmdline"); 334 } else 335 ordered_lsm_parse(builtin_lsm_order, "builtin"); 336 337 for (lsm = ordered_lsms; *lsm; lsm++) 338 prepare_lsm(*lsm); 339 340 init_debug("cred blob size = %d\n", blob_sizes.lbs_cred); 341 init_debug("file blob size = %d\n", blob_sizes.lbs_file); 342 init_debug("inode blob size = %d\n", blob_sizes.lbs_inode); 343 init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc); 344 init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg); 345 init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock); 346 init_debug("task blob size = %d\n", blob_sizes.lbs_task); 347 348 /* 349 * Create any kmem_caches needed for blobs 350 */ 351 if (blob_sizes.lbs_file) 352 lsm_file_cache = kmem_cache_create("lsm_file_cache", 353 blob_sizes.lbs_file, 0, 354 SLAB_PANIC, NULL); 355 if (blob_sizes.lbs_inode) 356 lsm_inode_cache = kmem_cache_create("lsm_inode_cache", 357 blob_sizes.lbs_inode, 0, 358 SLAB_PANIC, NULL); 359 360 lsm_early_cred((struct cred *) current->cred); 361 lsm_early_task(current); 362 for (lsm = ordered_lsms; *lsm; lsm++) 363 initialize_lsm(*lsm); 364 365 kfree(ordered_lsms); 366 } 367 368 int __init early_security_init(void) 369 { 370 int i; 371 struct hlist_head *list = (struct hlist_head *) &security_hook_heads; 372 struct lsm_info *lsm; 373 374 for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct hlist_head); 375 i++) 376 INIT_HLIST_HEAD(&list[i]); 377 378 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) { 379 if (!lsm->enabled) 380 lsm->enabled = &lsm_enabled_true; 381 prepare_lsm(lsm); 382 initialize_lsm(lsm); 383 } 384 385 return 0; 386 } 387 388 /** 389 * security_init - initializes the security framework 390 * 391 * This should be called early in the kernel initialization sequence. 392 */ 393 int __init security_init(void) 394 { 395 struct lsm_info *lsm; 396 397 pr_info("Security Framework initializing\n"); 398 399 /* 400 * Append the names of the early LSM modules now that kmalloc() is 401 * available 402 */ 403 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) { 404 if (lsm->enabled) 405 lsm_append(lsm->name, &lsm_names); 406 } 407 408 /* Load LSMs in specified order. */ 409 ordered_lsm_init(); 410 411 return 0; 412 } 413 414 /* Save user chosen LSM */ 415 static int __init choose_major_lsm(char *str) 416 { 417 chosen_major_lsm = str; 418 return 1; 419 } 420 __setup("security=", choose_major_lsm); 421 422 /* Explicitly choose LSM initialization order. */ 423 static int __init choose_lsm_order(char *str) 424 { 425 chosen_lsm_order = str; 426 return 1; 427 } 428 __setup("lsm=", choose_lsm_order); 429 430 /* Enable LSM order debugging. */ 431 static int __init enable_debug(char *str) 432 { 433 debug = true; 434 return 1; 435 } 436 __setup("lsm.debug", enable_debug); 437 438 static bool match_last_lsm(const char *list, const char *lsm) 439 { 440 const char *last; 441 442 if (WARN_ON(!list || !lsm)) 443 return false; 444 last = strrchr(list, ','); 445 if (last) 446 /* Pass the comma, strcmp() will check for '\0' */ 447 last++; 448 else 449 last = list; 450 return !strcmp(last, lsm); 451 } 452 453 static int lsm_append(const char *new, char **result) 454 { 455 char *cp; 456 457 if (*result == NULL) { 458 *result = kstrdup(new, GFP_KERNEL); 459 if (*result == NULL) 460 return -ENOMEM; 461 } else { 462 /* Check if it is the last registered name */ 463 if (match_last_lsm(*result, new)) 464 return 0; 465 cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new); 466 if (cp == NULL) 467 return -ENOMEM; 468 kfree(*result); 469 *result = cp; 470 } 471 return 0; 472 } 473 474 /** 475 * security_add_hooks - Add a modules hooks to the hook lists. 476 * @hooks: the hooks to add 477 * @count: the number of hooks to add 478 * @lsm: the name of the security module 479 * 480 * Each LSM has to register its hooks with the infrastructure. 481 */ 482 void __init security_add_hooks(struct security_hook_list *hooks, int count, 483 char *lsm) 484 { 485 int i; 486 487 for (i = 0; i < count; i++) { 488 hooks[i].lsm = lsm; 489 hlist_add_tail_rcu(&hooks[i].list, hooks[i].head); 490 } 491 492 /* 493 * Don't try to append during early_security_init(), we'll come back 494 * and fix this up afterwards. 495 */ 496 if (slab_is_available()) { 497 if (lsm_append(lsm, &lsm_names) < 0) 498 panic("%s - Cannot get early memory.\n", __func__); 499 } 500 } 501 502 int call_blocking_lsm_notifier(enum lsm_event event, void *data) 503 { 504 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain, 505 event, data); 506 } 507 EXPORT_SYMBOL(call_blocking_lsm_notifier); 508 509 int register_blocking_lsm_notifier(struct notifier_block *nb) 510 { 511 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain, 512 nb); 513 } 514 EXPORT_SYMBOL(register_blocking_lsm_notifier); 515 516 int unregister_blocking_lsm_notifier(struct notifier_block *nb) 517 { 518 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain, 519 nb); 520 } 521 EXPORT_SYMBOL(unregister_blocking_lsm_notifier); 522 523 /** 524 * lsm_cred_alloc - allocate a composite cred blob 525 * @cred: the cred that needs a blob 526 * @gfp: allocation type 527 * 528 * Allocate the cred blob for all the modules 529 * 530 * Returns 0, or -ENOMEM if memory can't be allocated. 531 */ 532 static int lsm_cred_alloc(struct cred *cred, gfp_t gfp) 533 { 534 if (blob_sizes.lbs_cred == 0) { 535 cred->security = NULL; 536 return 0; 537 } 538 539 cred->security = kzalloc(blob_sizes.lbs_cred, gfp); 540 if (cred->security == NULL) 541 return -ENOMEM; 542 return 0; 543 } 544 545 /** 546 * lsm_early_cred - during initialization allocate a composite cred blob 547 * @cred: the cred that needs a blob 548 * 549 * Allocate the cred blob for all the modules 550 */ 551 static void __init lsm_early_cred(struct cred *cred) 552 { 553 int rc = lsm_cred_alloc(cred, GFP_KERNEL); 554 555 if (rc) 556 panic("%s: Early cred alloc failed.\n", __func__); 557 } 558 559 /** 560 * lsm_file_alloc - allocate a composite file blob 561 * @file: the file that needs a blob 562 * 563 * Allocate the file blob for all the modules 564 * 565 * Returns 0, or -ENOMEM if memory can't be allocated. 566 */ 567 static int lsm_file_alloc(struct file *file) 568 { 569 if (!lsm_file_cache) { 570 file->f_security = NULL; 571 return 0; 572 } 573 574 file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL); 575 if (file->f_security == NULL) 576 return -ENOMEM; 577 return 0; 578 } 579 580 /** 581 * lsm_inode_alloc - allocate a composite inode blob 582 * @inode: the inode that needs a blob 583 * 584 * Allocate the inode blob for all the modules 585 * 586 * Returns 0, or -ENOMEM if memory can't be allocated. 587 */ 588 int lsm_inode_alloc(struct inode *inode) 589 { 590 if (!lsm_inode_cache) { 591 inode->i_security = NULL; 592 return 0; 593 } 594 595 inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS); 596 if (inode->i_security == NULL) 597 return -ENOMEM; 598 return 0; 599 } 600 601 /** 602 * lsm_task_alloc - allocate a composite task blob 603 * @task: the task that needs a blob 604 * 605 * Allocate the task blob for all the modules 606 * 607 * Returns 0, or -ENOMEM if memory can't be allocated. 608 */ 609 static int lsm_task_alloc(struct task_struct *task) 610 { 611 if (blob_sizes.lbs_task == 0) { 612 task->security = NULL; 613 return 0; 614 } 615 616 task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL); 617 if (task->security == NULL) 618 return -ENOMEM; 619 return 0; 620 } 621 622 /** 623 * lsm_ipc_alloc - allocate a composite ipc blob 624 * @kip: the ipc that needs a blob 625 * 626 * Allocate the ipc blob for all the modules 627 * 628 * Returns 0, or -ENOMEM if memory can't be allocated. 629 */ 630 static int lsm_ipc_alloc(struct kern_ipc_perm *kip) 631 { 632 if (blob_sizes.lbs_ipc == 0) { 633 kip->security = NULL; 634 return 0; 635 } 636 637 kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL); 638 if (kip->security == NULL) 639 return -ENOMEM; 640 return 0; 641 } 642 643 /** 644 * lsm_msg_msg_alloc - allocate a composite msg_msg blob 645 * @mp: the msg_msg that needs a blob 646 * 647 * Allocate the ipc blob for all the modules 648 * 649 * Returns 0, or -ENOMEM if memory can't be allocated. 650 */ 651 static int lsm_msg_msg_alloc(struct msg_msg *mp) 652 { 653 if (blob_sizes.lbs_msg_msg == 0) { 654 mp->security = NULL; 655 return 0; 656 } 657 658 mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL); 659 if (mp->security == NULL) 660 return -ENOMEM; 661 return 0; 662 } 663 664 /** 665 * lsm_early_task - during initialization allocate a composite task blob 666 * @task: the task that needs a blob 667 * 668 * Allocate the task blob for all the modules 669 */ 670 static void __init lsm_early_task(struct task_struct *task) 671 { 672 int rc = lsm_task_alloc(task); 673 674 if (rc) 675 panic("%s: Early task alloc failed.\n", __func__); 676 } 677 678 /** 679 * lsm_superblock_alloc - allocate a composite superblock blob 680 * @sb: the superblock that needs a blob 681 * 682 * Allocate the superblock blob for all the modules 683 * 684 * Returns 0, or -ENOMEM if memory can't be allocated. 685 */ 686 static int lsm_superblock_alloc(struct super_block *sb) 687 { 688 if (blob_sizes.lbs_superblock == 0) { 689 sb->s_security = NULL; 690 return 0; 691 } 692 693 sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL); 694 if (sb->s_security == NULL) 695 return -ENOMEM; 696 return 0; 697 } 698 699 /* 700 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and 701 * can be accessed with: 702 * 703 * LSM_RET_DEFAULT(<hook_name>) 704 * 705 * The macros below define static constants for the default value of each 706 * LSM hook. 707 */ 708 #define LSM_RET_DEFAULT(NAME) (NAME##_default) 709 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME) 710 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \ 711 static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT); 712 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \ 713 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME) 714 715 #include <linux/lsm_hook_defs.h> 716 #undef LSM_HOOK 717 718 /* 719 * Hook list operation macros. 720 * 721 * call_void_hook: 722 * This is a hook that does not return a value. 723 * 724 * call_int_hook: 725 * This is a hook that returns a value. 726 */ 727 728 #define call_void_hook(FUNC, ...) \ 729 do { \ 730 struct security_hook_list *P; \ 731 \ 732 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \ 733 P->hook.FUNC(__VA_ARGS__); \ 734 } while (0) 735 736 #define call_int_hook(FUNC, IRC, ...) ({ \ 737 int RC = IRC; \ 738 do { \ 739 struct security_hook_list *P; \ 740 \ 741 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \ 742 RC = P->hook.FUNC(__VA_ARGS__); \ 743 if (RC != 0) \ 744 break; \ 745 } \ 746 } while (0); \ 747 RC; \ 748 }) 749 750 /* Security operations */ 751 752 int security_binder_set_context_mgr(const struct cred *mgr) 753 { 754 return call_int_hook(binder_set_context_mgr, 0, mgr); 755 } 756 757 int security_binder_transaction(const struct cred *from, 758 const struct cred *to) 759 { 760 return call_int_hook(binder_transaction, 0, from, to); 761 } 762 763 int security_binder_transfer_binder(const struct cred *from, 764 const struct cred *to) 765 { 766 return call_int_hook(binder_transfer_binder, 0, from, to); 767 } 768 769 int security_binder_transfer_file(const struct cred *from, 770 const struct cred *to, struct file *file) 771 { 772 return call_int_hook(binder_transfer_file, 0, from, to, file); 773 } 774 775 int security_ptrace_access_check(struct task_struct *child, unsigned int mode) 776 { 777 return call_int_hook(ptrace_access_check, 0, child, mode); 778 } 779 780 int security_ptrace_traceme(struct task_struct *parent) 781 { 782 return call_int_hook(ptrace_traceme, 0, parent); 783 } 784 785 int security_capget(struct task_struct *target, 786 kernel_cap_t *effective, 787 kernel_cap_t *inheritable, 788 kernel_cap_t *permitted) 789 { 790 return call_int_hook(capget, 0, target, 791 effective, inheritable, permitted); 792 } 793 794 int security_capset(struct cred *new, const struct cred *old, 795 const kernel_cap_t *effective, 796 const kernel_cap_t *inheritable, 797 const kernel_cap_t *permitted) 798 { 799 return call_int_hook(capset, 0, new, old, 800 effective, inheritable, permitted); 801 } 802 803 int security_capable(const struct cred *cred, 804 struct user_namespace *ns, 805 int cap, 806 unsigned int opts) 807 { 808 return call_int_hook(capable, 0, cred, ns, cap, opts); 809 } 810 811 int security_quotactl(int cmds, int type, int id, struct super_block *sb) 812 { 813 return call_int_hook(quotactl, 0, cmds, type, id, sb); 814 } 815 816 int security_quota_on(struct dentry *dentry) 817 { 818 return call_int_hook(quota_on, 0, dentry); 819 } 820 821 int security_syslog(int type) 822 { 823 return call_int_hook(syslog, 0, type); 824 } 825 826 int security_settime64(const struct timespec64 *ts, const struct timezone *tz) 827 { 828 return call_int_hook(settime, 0, ts, tz); 829 } 830 831 int security_vm_enough_memory_mm(struct mm_struct *mm, long pages) 832 { 833 struct security_hook_list *hp; 834 int cap_sys_admin = 1; 835 int rc; 836 837 /* 838 * The module will respond with a positive value if 839 * it thinks the __vm_enough_memory() call should be 840 * made with the cap_sys_admin set. If all of the modules 841 * agree that it should be set it will. If any module 842 * thinks it should not be set it won't. 843 */ 844 hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) { 845 rc = hp->hook.vm_enough_memory(mm, pages); 846 if (rc <= 0) { 847 cap_sys_admin = 0; 848 break; 849 } 850 } 851 return __vm_enough_memory(mm, pages, cap_sys_admin); 852 } 853 854 int security_bprm_creds_for_exec(struct linux_binprm *bprm) 855 { 856 return call_int_hook(bprm_creds_for_exec, 0, bprm); 857 } 858 859 int security_bprm_creds_from_file(struct linux_binprm *bprm, struct file *file) 860 { 861 return call_int_hook(bprm_creds_from_file, 0, bprm, file); 862 } 863 864 int security_bprm_check(struct linux_binprm *bprm) 865 { 866 int ret; 867 868 ret = call_int_hook(bprm_check_security, 0, bprm); 869 if (ret) 870 return ret; 871 return ima_bprm_check(bprm); 872 } 873 874 void security_bprm_committing_creds(struct linux_binprm *bprm) 875 { 876 call_void_hook(bprm_committing_creds, bprm); 877 } 878 879 void security_bprm_committed_creds(struct linux_binprm *bprm) 880 { 881 call_void_hook(bprm_committed_creds, bprm); 882 } 883 884 int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc) 885 { 886 return call_int_hook(fs_context_dup, 0, fc, src_fc); 887 } 888 889 int security_fs_context_parse_param(struct fs_context *fc, 890 struct fs_parameter *param) 891 { 892 struct security_hook_list *hp; 893 int trc; 894 int rc = -ENOPARAM; 895 896 hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param, 897 list) { 898 trc = hp->hook.fs_context_parse_param(fc, param); 899 if (trc == 0) 900 rc = 0; 901 else if (trc != -ENOPARAM) 902 return trc; 903 } 904 return rc; 905 } 906 907 int security_sb_alloc(struct super_block *sb) 908 { 909 int rc = lsm_superblock_alloc(sb); 910 911 if (unlikely(rc)) 912 return rc; 913 rc = call_int_hook(sb_alloc_security, 0, sb); 914 if (unlikely(rc)) 915 security_sb_free(sb); 916 return rc; 917 } 918 919 void security_sb_delete(struct super_block *sb) 920 { 921 call_void_hook(sb_delete, sb); 922 } 923 924 void security_sb_free(struct super_block *sb) 925 { 926 call_void_hook(sb_free_security, sb); 927 kfree(sb->s_security); 928 sb->s_security = NULL; 929 } 930 931 void security_free_mnt_opts(void **mnt_opts) 932 { 933 if (!*mnt_opts) 934 return; 935 call_void_hook(sb_free_mnt_opts, *mnt_opts); 936 *mnt_opts = NULL; 937 } 938 EXPORT_SYMBOL(security_free_mnt_opts); 939 940 int security_sb_eat_lsm_opts(char *options, void **mnt_opts) 941 { 942 return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts); 943 } 944 EXPORT_SYMBOL(security_sb_eat_lsm_opts); 945 946 int security_sb_mnt_opts_compat(struct super_block *sb, 947 void *mnt_opts) 948 { 949 return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts); 950 } 951 EXPORT_SYMBOL(security_sb_mnt_opts_compat); 952 953 int security_sb_remount(struct super_block *sb, 954 void *mnt_opts) 955 { 956 return call_int_hook(sb_remount, 0, sb, mnt_opts); 957 } 958 EXPORT_SYMBOL(security_sb_remount); 959 960 int security_sb_kern_mount(struct super_block *sb) 961 { 962 return call_int_hook(sb_kern_mount, 0, sb); 963 } 964 965 int security_sb_show_options(struct seq_file *m, struct super_block *sb) 966 { 967 return call_int_hook(sb_show_options, 0, m, sb); 968 } 969 970 int security_sb_statfs(struct dentry *dentry) 971 { 972 return call_int_hook(sb_statfs, 0, dentry); 973 } 974 975 int security_sb_mount(const char *dev_name, const struct path *path, 976 const char *type, unsigned long flags, void *data) 977 { 978 return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data); 979 } 980 981 int security_sb_umount(struct vfsmount *mnt, int flags) 982 { 983 return call_int_hook(sb_umount, 0, mnt, flags); 984 } 985 986 int security_sb_pivotroot(const struct path *old_path, const struct path *new_path) 987 { 988 return call_int_hook(sb_pivotroot, 0, old_path, new_path); 989 } 990 991 int security_sb_set_mnt_opts(struct super_block *sb, 992 void *mnt_opts, 993 unsigned long kern_flags, 994 unsigned long *set_kern_flags) 995 { 996 return call_int_hook(sb_set_mnt_opts, 997 mnt_opts ? -EOPNOTSUPP : 0, sb, 998 mnt_opts, kern_flags, set_kern_flags); 999 } 1000 EXPORT_SYMBOL(security_sb_set_mnt_opts); 1001 1002 int security_sb_clone_mnt_opts(const struct super_block *oldsb, 1003 struct super_block *newsb, 1004 unsigned long kern_flags, 1005 unsigned long *set_kern_flags) 1006 { 1007 return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb, 1008 kern_flags, set_kern_flags); 1009 } 1010 EXPORT_SYMBOL(security_sb_clone_mnt_opts); 1011 1012 int security_move_mount(const struct path *from_path, const struct path *to_path) 1013 { 1014 return call_int_hook(move_mount, 0, from_path, to_path); 1015 } 1016 1017 int security_path_notify(const struct path *path, u64 mask, 1018 unsigned int obj_type) 1019 { 1020 return call_int_hook(path_notify, 0, path, mask, obj_type); 1021 } 1022 1023 int security_inode_alloc(struct inode *inode) 1024 { 1025 int rc = lsm_inode_alloc(inode); 1026 1027 if (unlikely(rc)) 1028 return rc; 1029 rc = call_int_hook(inode_alloc_security, 0, inode); 1030 if (unlikely(rc)) 1031 security_inode_free(inode); 1032 return rc; 1033 } 1034 1035 static void inode_free_by_rcu(struct rcu_head *head) 1036 { 1037 /* 1038 * The rcu head is at the start of the inode blob 1039 */ 1040 kmem_cache_free(lsm_inode_cache, head); 1041 } 1042 1043 void security_inode_free(struct inode *inode) 1044 { 1045 integrity_inode_free(inode); 1046 call_void_hook(inode_free_security, inode); 1047 /* 1048 * The inode may still be referenced in a path walk and 1049 * a call to security_inode_permission() can be made 1050 * after inode_free_security() is called. Ideally, the VFS 1051 * wouldn't do this, but fixing that is a much harder 1052 * job. For now, simply free the i_security via RCU, and 1053 * leave the current inode->i_security pointer intact. 1054 * The inode will be freed after the RCU grace period too. 1055 */ 1056 if (inode->i_security) 1057 call_rcu((struct rcu_head *)inode->i_security, 1058 inode_free_by_rcu); 1059 } 1060 1061 int security_dentry_init_security(struct dentry *dentry, int mode, 1062 const struct qstr *name, 1063 const char **xattr_name, void **ctx, 1064 u32 *ctxlen) 1065 { 1066 struct security_hook_list *hp; 1067 int rc; 1068 1069 /* 1070 * Only one module will provide a security context. 1071 */ 1072 hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security, list) { 1073 rc = hp->hook.dentry_init_security(dentry, mode, name, 1074 xattr_name, ctx, ctxlen); 1075 if (rc != LSM_RET_DEFAULT(dentry_init_security)) 1076 return rc; 1077 } 1078 return LSM_RET_DEFAULT(dentry_init_security); 1079 } 1080 EXPORT_SYMBOL(security_dentry_init_security); 1081 1082 int security_dentry_create_files_as(struct dentry *dentry, int mode, 1083 struct qstr *name, 1084 const struct cred *old, struct cred *new) 1085 { 1086 return call_int_hook(dentry_create_files_as, 0, dentry, mode, 1087 name, old, new); 1088 } 1089 EXPORT_SYMBOL(security_dentry_create_files_as); 1090 1091 int security_inode_init_security(struct inode *inode, struct inode *dir, 1092 const struct qstr *qstr, 1093 const initxattrs initxattrs, void *fs_data) 1094 { 1095 struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1]; 1096 struct xattr *lsm_xattr, *evm_xattr, *xattr; 1097 int ret; 1098 1099 if (unlikely(IS_PRIVATE(inode))) 1100 return 0; 1101 1102 if (!initxattrs) 1103 return call_int_hook(inode_init_security, -EOPNOTSUPP, inode, 1104 dir, qstr, NULL, NULL, NULL); 1105 memset(new_xattrs, 0, sizeof(new_xattrs)); 1106 lsm_xattr = new_xattrs; 1107 ret = call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir, qstr, 1108 &lsm_xattr->name, 1109 &lsm_xattr->value, 1110 &lsm_xattr->value_len); 1111 if (ret) 1112 goto out; 1113 1114 evm_xattr = lsm_xattr + 1; 1115 ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr); 1116 if (ret) 1117 goto out; 1118 ret = initxattrs(inode, new_xattrs, fs_data); 1119 out: 1120 for (xattr = new_xattrs; xattr->value != NULL; xattr++) 1121 kfree(xattr->value); 1122 return (ret == -EOPNOTSUPP) ? 0 : ret; 1123 } 1124 EXPORT_SYMBOL(security_inode_init_security); 1125 1126 int security_inode_init_security_anon(struct inode *inode, 1127 const struct qstr *name, 1128 const struct inode *context_inode) 1129 { 1130 return call_int_hook(inode_init_security_anon, 0, inode, name, 1131 context_inode); 1132 } 1133 1134 int security_old_inode_init_security(struct inode *inode, struct inode *dir, 1135 const struct qstr *qstr, const char **name, 1136 void **value, size_t *len) 1137 { 1138 if (unlikely(IS_PRIVATE(inode))) 1139 return -EOPNOTSUPP; 1140 return call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir, 1141 qstr, name, value, len); 1142 } 1143 EXPORT_SYMBOL(security_old_inode_init_security); 1144 1145 #ifdef CONFIG_SECURITY_PATH 1146 int security_path_mknod(const struct path *dir, struct dentry *dentry, umode_t mode, 1147 unsigned int dev) 1148 { 1149 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1150 return 0; 1151 return call_int_hook(path_mknod, 0, dir, dentry, mode, dev); 1152 } 1153 EXPORT_SYMBOL(security_path_mknod); 1154 1155 int security_path_mkdir(const struct path *dir, struct dentry *dentry, umode_t mode) 1156 { 1157 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1158 return 0; 1159 return call_int_hook(path_mkdir, 0, dir, dentry, mode); 1160 } 1161 EXPORT_SYMBOL(security_path_mkdir); 1162 1163 int security_path_rmdir(const struct path *dir, struct dentry *dentry) 1164 { 1165 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1166 return 0; 1167 return call_int_hook(path_rmdir, 0, dir, dentry); 1168 } 1169 1170 int security_path_unlink(const struct path *dir, struct dentry *dentry) 1171 { 1172 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1173 return 0; 1174 return call_int_hook(path_unlink, 0, dir, dentry); 1175 } 1176 EXPORT_SYMBOL(security_path_unlink); 1177 1178 int security_path_symlink(const struct path *dir, struct dentry *dentry, 1179 const char *old_name) 1180 { 1181 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1182 return 0; 1183 return call_int_hook(path_symlink, 0, dir, dentry, old_name); 1184 } 1185 1186 int security_path_link(struct dentry *old_dentry, const struct path *new_dir, 1187 struct dentry *new_dentry) 1188 { 1189 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)))) 1190 return 0; 1191 return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry); 1192 } 1193 1194 int security_path_rename(const struct path *old_dir, struct dentry *old_dentry, 1195 const struct path *new_dir, struct dentry *new_dentry, 1196 unsigned int flags) 1197 { 1198 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) || 1199 (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry))))) 1200 return 0; 1201 1202 if (flags & RENAME_EXCHANGE) { 1203 int err = call_int_hook(path_rename, 0, new_dir, new_dentry, 1204 old_dir, old_dentry); 1205 if (err) 1206 return err; 1207 } 1208 1209 return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir, 1210 new_dentry); 1211 } 1212 EXPORT_SYMBOL(security_path_rename); 1213 1214 int security_path_truncate(const struct path *path) 1215 { 1216 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1217 return 0; 1218 return call_int_hook(path_truncate, 0, path); 1219 } 1220 1221 int security_path_chmod(const struct path *path, umode_t mode) 1222 { 1223 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1224 return 0; 1225 return call_int_hook(path_chmod, 0, path, mode); 1226 } 1227 1228 int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) 1229 { 1230 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1231 return 0; 1232 return call_int_hook(path_chown, 0, path, uid, gid); 1233 } 1234 1235 int security_path_chroot(const struct path *path) 1236 { 1237 return call_int_hook(path_chroot, 0, path); 1238 } 1239 #endif 1240 1241 int security_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode) 1242 { 1243 if (unlikely(IS_PRIVATE(dir))) 1244 return 0; 1245 return call_int_hook(inode_create, 0, dir, dentry, mode); 1246 } 1247 EXPORT_SYMBOL_GPL(security_inode_create); 1248 1249 int security_inode_link(struct dentry *old_dentry, struct inode *dir, 1250 struct dentry *new_dentry) 1251 { 1252 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)))) 1253 return 0; 1254 return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry); 1255 } 1256 1257 int security_inode_unlink(struct inode *dir, struct dentry *dentry) 1258 { 1259 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1260 return 0; 1261 return call_int_hook(inode_unlink, 0, dir, dentry); 1262 } 1263 1264 int security_inode_symlink(struct inode *dir, struct dentry *dentry, 1265 const char *old_name) 1266 { 1267 if (unlikely(IS_PRIVATE(dir))) 1268 return 0; 1269 return call_int_hook(inode_symlink, 0, dir, dentry, old_name); 1270 } 1271 1272 int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1273 { 1274 if (unlikely(IS_PRIVATE(dir))) 1275 return 0; 1276 return call_int_hook(inode_mkdir, 0, dir, dentry, mode); 1277 } 1278 EXPORT_SYMBOL_GPL(security_inode_mkdir); 1279 1280 int security_inode_rmdir(struct inode *dir, struct dentry *dentry) 1281 { 1282 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1283 return 0; 1284 return call_int_hook(inode_rmdir, 0, dir, dentry); 1285 } 1286 1287 int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 1288 { 1289 if (unlikely(IS_PRIVATE(dir))) 1290 return 0; 1291 return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev); 1292 } 1293 1294 int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry, 1295 struct inode *new_dir, struct dentry *new_dentry, 1296 unsigned int flags) 1297 { 1298 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) || 1299 (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry))))) 1300 return 0; 1301 1302 if (flags & RENAME_EXCHANGE) { 1303 int err = call_int_hook(inode_rename, 0, new_dir, new_dentry, 1304 old_dir, old_dentry); 1305 if (err) 1306 return err; 1307 } 1308 1309 return call_int_hook(inode_rename, 0, old_dir, old_dentry, 1310 new_dir, new_dentry); 1311 } 1312 1313 int security_inode_readlink(struct dentry *dentry) 1314 { 1315 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1316 return 0; 1317 return call_int_hook(inode_readlink, 0, dentry); 1318 } 1319 1320 int security_inode_follow_link(struct dentry *dentry, struct inode *inode, 1321 bool rcu) 1322 { 1323 if (unlikely(IS_PRIVATE(inode))) 1324 return 0; 1325 return call_int_hook(inode_follow_link, 0, dentry, inode, rcu); 1326 } 1327 1328 int security_inode_permission(struct inode *inode, int mask) 1329 { 1330 if (unlikely(IS_PRIVATE(inode))) 1331 return 0; 1332 return call_int_hook(inode_permission, 0, inode, mask); 1333 } 1334 1335 int security_inode_setattr(struct dentry *dentry, struct iattr *attr) 1336 { 1337 int ret; 1338 1339 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1340 return 0; 1341 ret = call_int_hook(inode_setattr, 0, dentry, attr); 1342 if (ret) 1343 return ret; 1344 return evm_inode_setattr(dentry, attr); 1345 } 1346 EXPORT_SYMBOL_GPL(security_inode_setattr); 1347 1348 int security_inode_getattr(const struct path *path) 1349 { 1350 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1351 return 0; 1352 return call_int_hook(inode_getattr, 0, path); 1353 } 1354 1355 int security_inode_setxattr(struct user_namespace *mnt_userns, 1356 struct dentry *dentry, const char *name, 1357 const void *value, size_t size, int flags) 1358 { 1359 int ret; 1360 1361 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1362 return 0; 1363 /* 1364 * SELinux and Smack integrate the cap call, 1365 * so assume that all LSMs supplying this call do so. 1366 */ 1367 ret = call_int_hook(inode_setxattr, 1, mnt_userns, dentry, name, value, 1368 size, flags); 1369 1370 if (ret == 1) 1371 ret = cap_inode_setxattr(dentry, name, value, size, flags); 1372 if (ret) 1373 return ret; 1374 ret = ima_inode_setxattr(dentry, name, value, size); 1375 if (ret) 1376 return ret; 1377 return evm_inode_setxattr(mnt_userns, dentry, name, value, size); 1378 } 1379 1380 void security_inode_post_setxattr(struct dentry *dentry, const char *name, 1381 const void *value, size_t size, int flags) 1382 { 1383 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1384 return; 1385 call_void_hook(inode_post_setxattr, dentry, name, value, size, flags); 1386 evm_inode_post_setxattr(dentry, name, value, size); 1387 } 1388 1389 int security_inode_getxattr(struct dentry *dentry, const char *name) 1390 { 1391 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1392 return 0; 1393 return call_int_hook(inode_getxattr, 0, dentry, name); 1394 } 1395 1396 int security_inode_listxattr(struct dentry *dentry) 1397 { 1398 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1399 return 0; 1400 return call_int_hook(inode_listxattr, 0, dentry); 1401 } 1402 1403 int security_inode_removexattr(struct user_namespace *mnt_userns, 1404 struct dentry *dentry, const char *name) 1405 { 1406 int ret; 1407 1408 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1409 return 0; 1410 /* 1411 * SELinux and Smack integrate the cap call, 1412 * so assume that all LSMs supplying this call do so. 1413 */ 1414 ret = call_int_hook(inode_removexattr, 1, mnt_userns, dentry, name); 1415 if (ret == 1) 1416 ret = cap_inode_removexattr(mnt_userns, dentry, name); 1417 if (ret) 1418 return ret; 1419 ret = ima_inode_removexattr(dentry, name); 1420 if (ret) 1421 return ret; 1422 return evm_inode_removexattr(mnt_userns, dentry, name); 1423 } 1424 1425 int security_inode_need_killpriv(struct dentry *dentry) 1426 { 1427 return call_int_hook(inode_need_killpriv, 0, dentry); 1428 } 1429 1430 int security_inode_killpriv(struct user_namespace *mnt_userns, 1431 struct dentry *dentry) 1432 { 1433 return call_int_hook(inode_killpriv, 0, mnt_userns, dentry); 1434 } 1435 1436 int security_inode_getsecurity(struct user_namespace *mnt_userns, 1437 struct inode *inode, const char *name, 1438 void **buffer, bool alloc) 1439 { 1440 struct security_hook_list *hp; 1441 int rc; 1442 1443 if (unlikely(IS_PRIVATE(inode))) 1444 return LSM_RET_DEFAULT(inode_getsecurity); 1445 /* 1446 * Only one module will provide an attribute with a given name. 1447 */ 1448 hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) { 1449 rc = hp->hook.inode_getsecurity(mnt_userns, inode, name, buffer, alloc); 1450 if (rc != LSM_RET_DEFAULT(inode_getsecurity)) 1451 return rc; 1452 } 1453 return LSM_RET_DEFAULT(inode_getsecurity); 1454 } 1455 1456 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags) 1457 { 1458 struct security_hook_list *hp; 1459 int rc; 1460 1461 if (unlikely(IS_PRIVATE(inode))) 1462 return LSM_RET_DEFAULT(inode_setsecurity); 1463 /* 1464 * Only one module will provide an attribute with a given name. 1465 */ 1466 hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) { 1467 rc = hp->hook.inode_setsecurity(inode, name, value, size, 1468 flags); 1469 if (rc != LSM_RET_DEFAULT(inode_setsecurity)) 1470 return rc; 1471 } 1472 return LSM_RET_DEFAULT(inode_setsecurity); 1473 } 1474 1475 int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) 1476 { 1477 if (unlikely(IS_PRIVATE(inode))) 1478 return 0; 1479 return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size); 1480 } 1481 EXPORT_SYMBOL(security_inode_listsecurity); 1482 1483 void security_inode_getsecid(struct inode *inode, u32 *secid) 1484 { 1485 call_void_hook(inode_getsecid, inode, secid); 1486 } 1487 1488 int security_inode_copy_up(struct dentry *src, struct cred **new) 1489 { 1490 return call_int_hook(inode_copy_up, 0, src, new); 1491 } 1492 EXPORT_SYMBOL(security_inode_copy_up); 1493 1494 int security_inode_copy_up_xattr(const char *name) 1495 { 1496 struct security_hook_list *hp; 1497 int rc; 1498 1499 /* 1500 * The implementation can return 0 (accept the xattr), 1 (discard the 1501 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or 1502 * any other error code incase of an error. 1503 */ 1504 hlist_for_each_entry(hp, 1505 &security_hook_heads.inode_copy_up_xattr, list) { 1506 rc = hp->hook.inode_copy_up_xattr(name); 1507 if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr)) 1508 return rc; 1509 } 1510 1511 return LSM_RET_DEFAULT(inode_copy_up_xattr); 1512 } 1513 EXPORT_SYMBOL(security_inode_copy_up_xattr); 1514 1515 int security_kernfs_init_security(struct kernfs_node *kn_dir, 1516 struct kernfs_node *kn) 1517 { 1518 return call_int_hook(kernfs_init_security, 0, kn_dir, kn); 1519 } 1520 1521 int security_file_permission(struct file *file, int mask) 1522 { 1523 int ret; 1524 1525 ret = call_int_hook(file_permission, 0, file, mask); 1526 if (ret) 1527 return ret; 1528 1529 return fsnotify_perm(file, mask); 1530 } 1531 1532 int security_file_alloc(struct file *file) 1533 { 1534 int rc = lsm_file_alloc(file); 1535 1536 if (rc) 1537 return rc; 1538 rc = call_int_hook(file_alloc_security, 0, file); 1539 if (unlikely(rc)) 1540 security_file_free(file); 1541 return rc; 1542 } 1543 1544 void security_file_free(struct file *file) 1545 { 1546 void *blob; 1547 1548 call_void_hook(file_free_security, file); 1549 1550 blob = file->f_security; 1551 if (blob) { 1552 file->f_security = NULL; 1553 kmem_cache_free(lsm_file_cache, blob); 1554 } 1555 } 1556 1557 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1558 { 1559 return call_int_hook(file_ioctl, 0, file, cmd, arg); 1560 } 1561 EXPORT_SYMBOL_GPL(security_file_ioctl); 1562 1563 static inline unsigned long mmap_prot(struct file *file, unsigned long prot) 1564 { 1565 /* 1566 * Does we have PROT_READ and does the application expect 1567 * it to imply PROT_EXEC? If not, nothing to talk about... 1568 */ 1569 if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ) 1570 return prot; 1571 if (!(current->personality & READ_IMPLIES_EXEC)) 1572 return prot; 1573 /* 1574 * if that's an anonymous mapping, let it. 1575 */ 1576 if (!file) 1577 return prot | PROT_EXEC; 1578 /* 1579 * ditto if it's not on noexec mount, except that on !MMU we need 1580 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case 1581 */ 1582 if (!path_noexec(&file->f_path)) { 1583 #ifndef CONFIG_MMU 1584 if (file->f_op->mmap_capabilities) { 1585 unsigned caps = file->f_op->mmap_capabilities(file); 1586 if (!(caps & NOMMU_MAP_EXEC)) 1587 return prot; 1588 } 1589 #endif 1590 return prot | PROT_EXEC; 1591 } 1592 /* anything on noexec mount won't get PROT_EXEC */ 1593 return prot; 1594 } 1595 1596 int security_mmap_file(struct file *file, unsigned long prot, 1597 unsigned long flags) 1598 { 1599 int ret; 1600 ret = call_int_hook(mmap_file, 0, file, prot, 1601 mmap_prot(file, prot), flags); 1602 if (ret) 1603 return ret; 1604 return ima_file_mmap(file, prot); 1605 } 1606 1607 int security_mmap_addr(unsigned long addr) 1608 { 1609 return call_int_hook(mmap_addr, 0, addr); 1610 } 1611 1612 int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, 1613 unsigned long prot) 1614 { 1615 int ret; 1616 1617 ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot); 1618 if (ret) 1619 return ret; 1620 return ima_file_mprotect(vma, prot); 1621 } 1622 1623 int security_file_lock(struct file *file, unsigned int cmd) 1624 { 1625 return call_int_hook(file_lock, 0, file, cmd); 1626 } 1627 1628 int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg) 1629 { 1630 return call_int_hook(file_fcntl, 0, file, cmd, arg); 1631 } 1632 1633 void security_file_set_fowner(struct file *file) 1634 { 1635 call_void_hook(file_set_fowner, file); 1636 } 1637 1638 int security_file_send_sigiotask(struct task_struct *tsk, 1639 struct fown_struct *fown, int sig) 1640 { 1641 return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig); 1642 } 1643 1644 int security_file_receive(struct file *file) 1645 { 1646 return call_int_hook(file_receive, 0, file); 1647 } 1648 1649 int security_file_open(struct file *file) 1650 { 1651 int ret; 1652 1653 ret = call_int_hook(file_open, 0, file); 1654 if (ret) 1655 return ret; 1656 1657 return fsnotify_perm(file, MAY_OPEN); 1658 } 1659 1660 int security_task_alloc(struct task_struct *task, unsigned long clone_flags) 1661 { 1662 int rc = lsm_task_alloc(task); 1663 1664 if (rc) 1665 return rc; 1666 rc = call_int_hook(task_alloc, 0, task, clone_flags); 1667 if (unlikely(rc)) 1668 security_task_free(task); 1669 return rc; 1670 } 1671 1672 void security_task_free(struct task_struct *task) 1673 { 1674 call_void_hook(task_free, task); 1675 1676 kfree(task->security); 1677 task->security = NULL; 1678 } 1679 1680 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp) 1681 { 1682 int rc = lsm_cred_alloc(cred, gfp); 1683 1684 if (rc) 1685 return rc; 1686 1687 rc = call_int_hook(cred_alloc_blank, 0, cred, gfp); 1688 if (unlikely(rc)) 1689 security_cred_free(cred); 1690 return rc; 1691 } 1692 1693 void security_cred_free(struct cred *cred) 1694 { 1695 /* 1696 * There is a failure case in prepare_creds() that 1697 * may result in a call here with ->security being NULL. 1698 */ 1699 if (unlikely(cred->security == NULL)) 1700 return; 1701 1702 call_void_hook(cred_free, cred); 1703 1704 kfree(cred->security); 1705 cred->security = NULL; 1706 } 1707 1708 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp) 1709 { 1710 int rc = lsm_cred_alloc(new, gfp); 1711 1712 if (rc) 1713 return rc; 1714 1715 rc = call_int_hook(cred_prepare, 0, new, old, gfp); 1716 if (unlikely(rc)) 1717 security_cred_free(new); 1718 return rc; 1719 } 1720 1721 void security_transfer_creds(struct cred *new, const struct cred *old) 1722 { 1723 call_void_hook(cred_transfer, new, old); 1724 } 1725 1726 void security_cred_getsecid(const struct cred *c, u32 *secid) 1727 { 1728 *secid = 0; 1729 call_void_hook(cred_getsecid, c, secid); 1730 } 1731 EXPORT_SYMBOL(security_cred_getsecid); 1732 1733 int security_kernel_act_as(struct cred *new, u32 secid) 1734 { 1735 return call_int_hook(kernel_act_as, 0, new, secid); 1736 } 1737 1738 int security_kernel_create_files_as(struct cred *new, struct inode *inode) 1739 { 1740 return call_int_hook(kernel_create_files_as, 0, new, inode); 1741 } 1742 1743 int security_kernel_module_request(char *kmod_name) 1744 { 1745 int ret; 1746 1747 ret = call_int_hook(kernel_module_request, 0, kmod_name); 1748 if (ret) 1749 return ret; 1750 return integrity_kernel_module_request(kmod_name); 1751 } 1752 1753 int security_kernel_read_file(struct file *file, enum kernel_read_file_id id, 1754 bool contents) 1755 { 1756 int ret; 1757 1758 ret = call_int_hook(kernel_read_file, 0, file, id, contents); 1759 if (ret) 1760 return ret; 1761 return ima_read_file(file, id, contents); 1762 } 1763 EXPORT_SYMBOL_GPL(security_kernel_read_file); 1764 1765 int security_kernel_post_read_file(struct file *file, char *buf, loff_t size, 1766 enum kernel_read_file_id id) 1767 { 1768 int ret; 1769 1770 ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id); 1771 if (ret) 1772 return ret; 1773 return ima_post_read_file(file, buf, size, id); 1774 } 1775 EXPORT_SYMBOL_GPL(security_kernel_post_read_file); 1776 1777 int security_kernel_load_data(enum kernel_load_data_id id, bool contents) 1778 { 1779 int ret; 1780 1781 ret = call_int_hook(kernel_load_data, 0, id, contents); 1782 if (ret) 1783 return ret; 1784 return ima_load_data(id, contents); 1785 } 1786 EXPORT_SYMBOL_GPL(security_kernel_load_data); 1787 1788 int security_kernel_post_load_data(char *buf, loff_t size, 1789 enum kernel_load_data_id id, 1790 char *description) 1791 { 1792 int ret; 1793 1794 ret = call_int_hook(kernel_post_load_data, 0, buf, size, id, 1795 description); 1796 if (ret) 1797 return ret; 1798 return ima_post_load_data(buf, size, id, description); 1799 } 1800 EXPORT_SYMBOL_GPL(security_kernel_post_load_data); 1801 1802 int security_task_fix_setuid(struct cred *new, const struct cred *old, 1803 int flags) 1804 { 1805 return call_int_hook(task_fix_setuid, 0, new, old, flags); 1806 } 1807 1808 int security_task_fix_setgid(struct cred *new, const struct cred *old, 1809 int flags) 1810 { 1811 return call_int_hook(task_fix_setgid, 0, new, old, flags); 1812 } 1813 1814 int security_task_setpgid(struct task_struct *p, pid_t pgid) 1815 { 1816 return call_int_hook(task_setpgid, 0, p, pgid); 1817 } 1818 1819 int security_task_getpgid(struct task_struct *p) 1820 { 1821 return call_int_hook(task_getpgid, 0, p); 1822 } 1823 1824 int security_task_getsid(struct task_struct *p) 1825 { 1826 return call_int_hook(task_getsid, 0, p); 1827 } 1828 1829 void security_current_getsecid_subj(u32 *secid) 1830 { 1831 *secid = 0; 1832 call_void_hook(current_getsecid_subj, secid); 1833 } 1834 EXPORT_SYMBOL(security_current_getsecid_subj); 1835 1836 void security_task_getsecid_obj(struct task_struct *p, u32 *secid) 1837 { 1838 *secid = 0; 1839 call_void_hook(task_getsecid_obj, p, secid); 1840 } 1841 EXPORT_SYMBOL(security_task_getsecid_obj); 1842 1843 int security_task_setnice(struct task_struct *p, int nice) 1844 { 1845 return call_int_hook(task_setnice, 0, p, nice); 1846 } 1847 1848 int security_task_setioprio(struct task_struct *p, int ioprio) 1849 { 1850 return call_int_hook(task_setioprio, 0, p, ioprio); 1851 } 1852 1853 int security_task_getioprio(struct task_struct *p) 1854 { 1855 return call_int_hook(task_getioprio, 0, p); 1856 } 1857 1858 int security_task_prlimit(const struct cred *cred, const struct cred *tcred, 1859 unsigned int flags) 1860 { 1861 return call_int_hook(task_prlimit, 0, cred, tcred, flags); 1862 } 1863 1864 int security_task_setrlimit(struct task_struct *p, unsigned int resource, 1865 struct rlimit *new_rlim) 1866 { 1867 return call_int_hook(task_setrlimit, 0, p, resource, new_rlim); 1868 } 1869 1870 int security_task_setscheduler(struct task_struct *p) 1871 { 1872 return call_int_hook(task_setscheduler, 0, p); 1873 } 1874 1875 int security_task_getscheduler(struct task_struct *p) 1876 { 1877 return call_int_hook(task_getscheduler, 0, p); 1878 } 1879 1880 int security_task_movememory(struct task_struct *p) 1881 { 1882 return call_int_hook(task_movememory, 0, p); 1883 } 1884 1885 int security_task_kill(struct task_struct *p, struct kernel_siginfo *info, 1886 int sig, const struct cred *cred) 1887 { 1888 return call_int_hook(task_kill, 0, p, info, sig, cred); 1889 } 1890 1891 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3, 1892 unsigned long arg4, unsigned long arg5) 1893 { 1894 int thisrc; 1895 int rc = LSM_RET_DEFAULT(task_prctl); 1896 struct security_hook_list *hp; 1897 1898 hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) { 1899 thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5); 1900 if (thisrc != LSM_RET_DEFAULT(task_prctl)) { 1901 rc = thisrc; 1902 if (thisrc != 0) 1903 break; 1904 } 1905 } 1906 return rc; 1907 } 1908 1909 void security_task_to_inode(struct task_struct *p, struct inode *inode) 1910 { 1911 call_void_hook(task_to_inode, p, inode); 1912 } 1913 1914 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag) 1915 { 1916 return call_int_hook(ipc_permission, 0, ipcp, flag); 1917 } 1918 1919 void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) 1920 { 1921 *secid = 0; 1922 call_void_hook(ipc_getsecid, ipcp, secid); 1923 } 1924 1925 int security_msg_msg_alloc(struct msg_msg *msg) 1926 { 1927 int rc = lsm_msg_msg_alloc(msg); 1928 1929 if (unlikely(rc)) 1930 return rc; 1931 rc = call_int_hook(msg_msg_alloc_security, 0, msg); 1932 if (unlikely(rc)) 1933 security_msg_msg_free(msg); 1934 return rc; 1935 } 1936 1937 void security_msg_msg_free(struct msg_msg *msg) 1938 { 1939 call_void_hook(msg_msg_free_security, msg); 1940 kfree(msg->security); 1941 msg->security = NULL; 1942 } 1943 1944 int security_msg_queue_alloc(struct kern_ipc_perm *msq) 1945 { 1946 int rc = lsm_ipc_alloc(msq); 1947 1948 if (unlikely(rc)) 1949 return rc; 1950 rc = call_int_hook(msg_queue_alloc_security, 0, msq); 1951 if (unlikely(rc)) 1952 security_msg_queue_free(msq); 1953 return rc; 1954 } 1955 1956 void security_msg_queue_free(struct kern_ipc_perm *msq) 1957 { 1958 call_void_hook(msg_queue_free_security, msq); 1959 kfree(msq->security); 1960 msq->security = NULL; 1961 } 1962 1963 int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) 1964 { 1965 return call_int_hook(msg_queue_associate, 0, msq, msqflg); 1966 } 1967 1968 int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd) 1969 { 1970 return call_int_hook(msg_queue_msgctl, 0, msq, cmd); 1971 } 1972 1973 int security_msg_queue_msgsnd(struct kern_ipc_perm *msq, 1974 struct msg_msg *msg, int msqflg) 1975 { 1976 return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg); 1977 } 1978 1979 int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, 1980 struct task_struct *target, long type, int mode) 1981 { 1982 return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode); 1983 } 1984 1985 int security_shm_alloc(struct kern_ipc_perm *shp) 1986 { 1987 int rc = lsm_ipc_alloc(shp); 1988 1989 if (unlikely(rc)) 1990 return rc; 1991 rc = call_int_hook(shm_alloc_security, 0, shp); 1992 if (unlikely(rc)) 1993 security_shm_free(shp); 1994 return rc; 1995 } 1996 1997 void security_shm_free(struct kern_ipc_perm *shp) 1998 { 1999 call_void_hook(shm_free_security, shp); 2000 kfree(shp->security); 2001 shp->security = NULL; 2002 } 2003 2004 int security_shm_associate(struct kern_ipc_perm *shp, int shmflg) 2005 { 2006 return call_int_hook(shm_associate, 0, shp, shmflg); 2007 } 2008 2009 int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd) 2010 { 2011 return call_int_hook(shm_shmctl, 0, shp, cmd); 2012 } 2013 2014 int security_shm_shmat(struct kern_ipc_perm *shp, char __user *shmaddr, int shmflg) 2015 { 2016 return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg); 2017 } 2018 2019 int security_sem_alloc(struct kern_ipc_perm *sma) 2020 { 2021 int rc = lsm_ipc_alloc(sma); 2022 2023 if (unlikely(rc)) 2024 return rc; 2025 rc = call_int_hook(sem_alloc_security, 0, sma); 2026 if (unlikely(rc)) 2027 security_sem_free(sma); 2028 return rc; 2029 } 2030 2031 void security_sem_free(struct kern_ipc_perm *sma) 2032 { 2033 call_void_hook(sem_free_security, sma); 2034 kfree(sma->security); 2035 sma->security = NULL; 2036 } 2037 2038 int security_sem_associate(struct kern_ipc_perm *sma, int semflg) 2039 { 2040 return call_int_hook(sem_associate, 0, sma, semflg); 2041 } 2042 2043 int security_sem_semctl(struct kern_ipc_perm *sma, int cmd) 2044 { 2045 return call_int_hook(sem_semctl, 0, sma, cmd); 2046 } 2047 2048 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops, 2049 unsigned nsops, int alter) 2050 { 2051 return call_int_hook(sem_semop, 0, sma, sops, nsops, alter); 2052 } 2053 2054 void security_d_instantiate(struct dentry *dentry, struct inode *inode) 2055 { 2056 if (unlikely(inode && IS_PRIVATE(inode))) 2057 return; 2058 call_void_hook(d_instantiate, dentry, inode); 2059 } 2060 EXPORT_SYMBOL(security_d_instantiate); 2061 2062 int security_getprocattr(struct task_struct *p, const char *lsm, char *name, 2063 char **value) 2064 { 2065 struct security_hook_list *hp; 2066 2067 hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) { 2068 if (lsm != NULL && strcmp(lsm, hp->lsm)) 2069 continue; 2070 return hp->hook.getprocattr(p, name, value); 2071 } 2072 return LSM_RET_DEFAULT(getprocattr); 2073 } 2074 2075 int security_setprocattr(const char *lsm, const char *name, void *value, 2076 size_t size) 2077 { 2078 struct security_hook_list *hp; 2079 2080 hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) { 2081 if (lsm != NULL && strcmp(lsm, hp->lsm)) 2082 continue; 2083 return hp->hook.setprocattr(name, value, size); 2084 } 2085 return LSM_RET_DEFAULT(setprocattr); 2086 } 2087 2088 int security_netlink_send(struct sock *sk, struct sk_buff *skb) 2089 { 2090 return call_int_hook(netlink_send, 0, sk, skb); 2091 } 2092 2093 int security_ismaclabel(const char *name) 2094 { 2095 return call_int_hook(ismaclabel, 0, name); 2096 } 2097 EXPORT_SYMBOL(security_ismaclabel); 2098 2099 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) 2100 { 2101 struct security_hook_list *hp; 2102 int rc; 2103 2104 /* 2105 * Currently, only one LSM can implement secid_to_secctx (i.e this 2106 * LSM hook is not "stackable"). 2107 */ 2108 hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) { 2109 rc = hp->hook.secid_to_secctx(secid, secdata, seclen); 2110 if (rc != LSM_RET_DEFAULT(secid_to_secctx)) 2111 return rc; 2112 } 2113 2114 return LSM_RET_DEFAULT(secid_to_secctx); 2115 } 2116 EXPORT_SYMBOL(security_secid_to_secctx); 2117 2118 int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) 2119 { 2120 *secid = 0; 2121 return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid); 2122 } 2123 EXPORT_SYMBOL(security_secctx_to_secid); 2124 2125 void security_release_secctx(char *secdata, u32 seclen) 2126 { 2127 call_void_hook(release_secctx, secdata, seclen); 2128 } 2129 EXPORT_SYMBOL(security_release_secctx); 2130 2131 void security_inode_invalidate_secctx(struct inode *inode) 2132 { 2133 call_void_hook(inode_invalidate_secctx, inode); 2134 } 2135 EXPORT_SYMBOL(security_inode_invalidate_secctx); 2136 2137 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) 2138 { 2139 return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen); 2140 } 2141 EXPORT_SYMBOL(security_inode_notifysecctx); 2142 2143 int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) 2144 { 2145 return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen); 2146 } 2147 EXPORT_SYMBOL(security_inode_setsecctx); 2148 2149 int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) 2150 { 2151 return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen); 2152 } 2153 EXPORT_SYMBOL(security_inode_getsecctx); 2154 2155 #ifdef CONFIG_WATCH_QUEUE 2156 int security_post_notification(const struct cred *w_cred, 2157 const struct cred *cred, 2158 struct watch_notification *n) 2159 { 2160 return call_int_hook(post_notification, 0, w_cred, cred, n); 2161 } 2162 #endif /* CONFIG_WATCH_QUEUE */ 2163 2164 #ifdef CONFIG_KEY_NOTIFICATIONS 2165 int security_watch_key(struct key *key) 2166 { 2167 return call_int_hook(watch_key, 0, key); 2168 } 2169 #endif 2170 2171 #ifdef CONFIG_SECURITY_NETWORK 2172 2173 int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk) 2174 { 2175 return call_int_hook(unix_stream_connect, 0, sock, other, newsk); 2176 } 2177 EXPORT_SYMBOL(security_unix_stream_connect); 2178 2179 int security_unix_may_send(struct socket *sock, struct socket *other) 2180 { 2181 return call_int_hook(unix_may_send, 0, sock, other); 2182 } 2183 EXPORT_SYMBOL(security_unix_may_send); 2184 2185 int security_socket_create(int family, int type, int protocol, int kern) 2186 { 2187 return call_int_hook(socket_create, 0, family, type, protocol, kern); 2188 } 2189 2190 int security_socket_post_create(struct socket *sock, int family, 2191 int type, int protocol, int kern) 2192 { 2193 return call_int_hook(socket_post_create, 0, sock, family, type, 2194 protocol, kern); 2195 } 2196 2197 int security_socket_socketpair(struct socket *socka, struct socket *sockb) 2198 { 2199 return call_int_hook(socket_socketpair, 0, socka, sockb); 2200 } 2201 EXPORT_SYMBOL(security_socket_socketpair); 2202 2203 int security_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) 2204 { 2205 return call_int_hook(socket_bind, 0, sock, address, addrlen); 2206 } 2207 2208 int security_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) 2209 { 2210 return call_int_hook(socket_connect, 0, sock, address, addrlen); 2211 } 2212 2213 int security_socket_listen(struct socket *sock, int backlog) 2214 { 2215 return call_int_hook(socket_listen, 0, sock, backlog); 2216 } 2217 2218 int security_socket_accept(struct socket *sock, struct socket *newsock) 2219 { 2220 return call_int_hook(socket_accept, 0, sock, newsock); 2221 } 2222 2223 int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size) 2224 { 2225 return call_int_hook(socket_sendmsg, 0, sock, msg, size); 2226 } 2227 2228 int security_socket_recvmsg(struct socket *sock, struct msghdr *msg, 2229 int size, int flags) 2230 { 2231 return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags); 2232 } 2233 2234 int security_socket_getsockname(struct socket *sock) 2235 { 2236 return call_int_hook(socket_getsockname, 0, sock); 2237 } 2238 2239 int security_socket_getpeername(struct socket *sock) 2240 { 2241 return call_int_hook(socket_getpeername, 0, sock); 2242 } 2243 2244 int security_socket_getsockopt(struct socket *sock, int level, int optname) 2245 { 2246 return call_int_hook(socket_getsockopt, 0, sock, level, optname); 2247 } 2248 2249 int security_socket_setsockopt(struct socket *sock, int level, int optname) 2250 { 2251 return call_int_hook(socket_setsockopt, 0, sock, level, optname); 2252 } 2253 2254 int security_socket_shutdown(struct socket *sock, int how) 2255 { 2256 return call_int_hook(socket_shutdown, 0, sock, how); 2257 } 2258 2259 int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) 2260 { 2261 return call_int_hook(socket_sock_rcv_skb, 0, sk, skb); 2262 } 2263 EXPORT_SYMBOL(security_sock_rcv_skb); 2264 2265 int security_socket_getpeersec_stream(struct socket *sock, char __user *optval, 2266 int __user *optlen, unsigned len) 2267 { 2268 return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock, 2269 optval, optlen, len); 2270 } 2271 2272 int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid) 2273 { 2274 return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock, 2275 skb, secid); 2276 } 2277 EXPORT_SYMBOL(security_socket_getpeersec_dgram); 2278 2279 int security_sk_alloc(struct sock *sk, int family, gfp_t priority) 2280 { 2281 return call_int_hook(sk_alloc_security, 0, sk, family, priority); 2282 } 2283 2284 void security_sk_free(struct sock *sk) 2285 { 2286 call_void_hook(sk_free_security, sk); 2287 } 2288 2289 void security_sk_clone(const struct sock *sk, struct sock *newsk) 2290 { 2291 call_void_hook(sk_clone_security, sk, newsk); 2292 } 2293 EXPORT_SYMBOL(security_sk_clone); 2294 2295 void security_sk_classify_flow(struct sock *sk, struct flowi_common *flic) 2296 { 2297 call_void_hook(sk_getsecid, sk, &flic->flowic_secid); 2298 } 2299 EXPORT_SYMBOL(security_sk_classify_flow); 2300 2301 void security_req_classify_flow(const struct request_sock *req, 2302 struct flowi_common *flic) 2303 { 2304 call_void_hook(req_classify_flow, req, flic); 2305 } 2306 EXPORT_SYMBOL(security_req_classify_flow); 2307 2308 void security_sock_graft(struct sock *sk, struct socket *parent) 2309 { 2310 call_void_hook(sock_graft, sk, parent); 2311 } 2312 EXPORT_SYMBOL(security_sock_graft); 2313 2314 int security_inet_conn_request(const struct sock *sk, 2315 struct sk_buff *skb, struct request_sock *req) 2316 { 2317 return call_int_hook(inet_conn_request, 0, sk, skb, req); 2318 } 2319 EXPORT_SYMBOL(security_inet_conn_request); 2320 2321 void security_inet_csk_clone(struct sock *newsk, 2322 const struct request_sock *req) 2323 { 2324 call_void_hook(inet_csk_clone, newsk, req); 2325 } 2326 2327 void security_inet_conn_established(struct sock *sk, 2328 struct sk_buff *skb) 2329 { 2330 call_void_hook(inet_conn_established, sk, skb); 2331 } 2332 EXPORT_SYMBOL(security_inet_conn_established); 2333 2334 int security_secmark_relabel_packet(u32 secid) 2335 { 2336 return call_int_hook(secmark_relabel_packet, 0, secid); 2337 } 2338 EXPORT_SYMBOL(security_secmark_relabel_packet); 2339 2340 void security_secmark_refcount_inc(void) 2341 { 2342 call_void_hook(secmark_refcount_inc); 2343 } 2344 EXPORT_SYMBOL(security_secmark_refcount_inc); 2345 2346 void security_secmark_refcount_dec(void) 2347 { 2348 call_void_hook(secmark_refcount_dec); 2349 } 2350 EXPORT_SYMBOL(security_secmark_refcount_dec); 2351 2352 int security_tun_dev_alloc_security(void **security) 2353 { 2354 return call_int_hook(tun_dev_alloc_security, 0, security); 2355 } 2356 EXPORT_SYMBOL(security_tun_dev_alloc_security); 2357 2358 void security_tun_dev_free_security(void *security) 2359 { 2360 call_void_hook(tun_dev_free_security, security); 2361 } 2362 EXPORT_SYMBOL(security_tun_dev_free_security); 2363 2364 int security_tun_dev_create(void) 2365 { 2366 return call_int_hook(tun_dev_create, 0); 2367 } 2368 EXPORT_SYMBOL(security_tun_dev_create); 2369 2370 int security_tun_dev_attach_queue(void *security) 2371 { 2372 return call_int_hook(tun_dev_attach_queue, 0, security); 2373 } 2374 EXPORT_SYMBOL(security_tun_dev_attach_queue); 2375 2376 int security_tun_dev_attach(struct sock *sk, void *security) 2377 { 2378 return call_int_hook(tun_dev_attach, 0, sk, security); 2379 } 2380 EXPORT_SYMBOL(security_tun_dev_attach); 2381 2382 int security_tun_dev_open(void *security) 2383 { 2384 return call_int_hook(tun_dev_open, 0, security); 2385 } 2386 EXPORT_SYMBOL(security_tun_dev_open); 2387 2388 int security_sctp_assoc_request(struct sctp_association *asoc, struct sk_buff *skb) 2389 { 2390 return call_int_hook(sctp_assoc_request, 0, asoc, skb); 2391 } 2392 EXPORT_SYMBOL(security_sctp_assoc_request); 2393 2394 int security_sctp_bind_connect(struct sock *sk, int optname, 2395 struct sockaddr *address, int addrlen) 2396 { 2397 return call_int_hook(sctp_bind_connect, 0, sk, optname, 2398 address, addrlen); 2399 } 2400 EXPORT_SYMBOL(security_sctp_bind_connect); 2401 2402 void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk, 2403 struct sock *newsk) 2404 { 2405 call_void_hook(sctp_sk_clone, asoc, sk, newsk); 2406 } 2407 EXPORT_SYMBOL(security_sctp_sk_clone); 2408 2409 int security_sctp_assoc_established(struct sctp_association *asoc, 2410 struct sk_buff *skb) 2411 { 2412 return call_int_hook(sctp_assoc_established, 0, asoc, skb); 2413 } 2414 EXPORT_SYMBOL(security_sctp_assoc_established); 2415 2416 #endif /* CONFIG_SECURITY_NETWORK */ 2417 2418 #ifdef CONFIG_SECURITY_INFINIBAND 2419 2420 int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey) 2421 { 2422 return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey); 2423 } 2424 EXPORT_SYMBOL(security_ib_pkey_access); 2425 2426 int security_ib_endport_manage_subnet(void *sec, const char *dev_name, u8 port_num) 2427 { 2428 return call_int_hook(ib_endport_manage_subnet, 0, sec, dev_name, port_num); 2429 } 2430 EXPORT_SYMBOL(security_ib_endport_manage_subnet); 2431 2432 int security_ib_alloc_security(void **sec) 2433 { 2434 return call_int_hook(ib_alloc_security, 0, sec); 2435 } 2436 EXPORT_SYMBOL(security_ib_alloc_security); 2437 2438 void security_ib_free_security(void *sec) 2439 { 2440 call_void_hook(ib_free_security, sec); 2441 } 2442 EXPORT_SYMBOL(security_ib_free_security); 2443 #endif /* CONFIG_SECURITY_INFINIBAND */ 2444 2445 #ifdef CONFIG_SECURITY_NETWORK_XFRM 2446 2447 int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, 2448 struct xfrm_user_sec_ctx *sec_ctx, 2449 gfp_t gfp) 2450 { 2451 return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp); 2452 } 2453 EXPORT_SYMBOL(security_xfrm_policy_alloc); 2454 2455 int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx, 2456 struct xfrm_sec_ctx **new_ctxp) 2457 { 2458 return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp); 2459 } 2460 2461 void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx) 2462 { 2463 call_void_hook(xfrm_policy_free_security, ctx); 2464 } 2465 EXPORT_SYMBOL(security_xfrm_policy_free); 2466 2467 int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx) 2468 { 2469 return call_int_hook(xfrm_policy_delete_security, 0, ctx); 2470 } 2471 2472 int security_xfrm_state_alloc(struct xfrm_state *x, 2473 struct xfrm_user_sec_ctx *sec_ctx) 2474 { 2475 return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx); 2476 } 2477 EXPORT_SYMBOL(security_xfrm_state_alloc); 2478 2479 int security_xfrm_state_alloc_acquire(struct xfrm_state *x, 2480 struct xfrm_sec_ctx *polsec, u32 secid) 2481 { 2482 return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid); 2483 } 2484 2485 int security_xfrm_state_delete(struct xfrm_state *x) 2486 { 2487 return call_int_hook(xfrm_state_delete_security, 0, x); 2488 } 2489 EXPORT_SYMBOL(security_xfrm_state_delete); 2490 2491 void security_xfrm_state_free(struct xfrm_state *x) 2492 { 2493 call_void_hook(xfrm_state_free_security, x); 2494 } 2495 2496 int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid) 2497 { 2498 return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid); 2499 } 2500 2501 int security_xfrm_state_pol_flow_match(struct xfrm_state *x, 2502 struct xfrm_policy *xp, 2503 const struct flowi_common *flic) 2504 { 2505 struct security_hook_list *hp; 2506 int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match); 2507 2508 /* 2509 * Since this function is expected to return 0 or 1, the judgment 2510 * becomes difficult if multiple LSMs supply this call. Fortunately, 2511 * we can use the first LSM's judgment because currently only SELinux 2512 * supplies this call. 2513 * 2514 * For speed optimization, we explicitly break the loop rather than 2515 * using the macro 2516 */ 2517 hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match, 2518 list) { 2519 rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic); 2520 break; 2521 } 2522 return rc; 2523 } 2524 2525 int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid) 2526 { 2527 return call_int_hook(xfrm_decode_session, 0, skb, secid, 1); 2528 } 2529 2530 void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic) 2531 { 2532 int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid, 2533 0); 2534 2535 BUG_ON(rc); 2536 } 2537 EXPORT_SYMBOL(security_skb_classify_flow); 2538 2539 #endif /* CONFIG_SECURITY_NETWORK_XFRM */ 2540 2541 #ifdef CONFIG_KEYS 2542 2543 int security_key_alloc(struct key *key, const struct cred *cred, 2544 unsigned long flags) 2545 { 2546 return call_int_hook(key_alloc, 0, key, cred, flags); 2547 } 2548 2549 void security_key_free(struct key *key) 2550 { 2551 call_void_hook(key_free, key); 2552 } 2553 2554 int security_key_permission(key_ref_t key_ref, const struct cred *cred, 2555 enum key_need_perm need_perm) 2556 { 2557 return call_int_hook(key_permission, 0, key_ref, cred, need_perm); 2558 } 2559 2560 int security_key_getsecurity(struct key *key, char **_buffer) 2561 { 2562 *_buffer = NULL; 2563 return call_int_hook(key_getsecurity, 0, key, _buffer); 2564 } 2565 2566 #endif /* CONFIG_KEYS */ 2567 2568 #ifdef CONFIG_AUDIT 2569 2570 int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule) 2571 { 2572 return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule); 2573 } 2574 2575 int security_audit_rule_known(struct audit_krule *krule) 2576 { 2577 return call_int_hook(audit_rule_known, 0, krule); 2578 } 2579 2580 void security_audit_rule_free(void *lsmrule) 2581 { 2582 call_void_hook(audit_rule_free, lsmrule); 2583 } 2584 2585 int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule) 2586 { 2587 return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule); 2588 } 2589 #endif /* CONFIG_AUDIT */ 2590 2591 #ifdef CONFIG_BPF_SYSCALL 2592 int security_bpf(int cmd, union bpf_attr *attr, unsigned int size) 2593 { 2594 return call_int_hook(bpf, 0, cmd, attr, size); 2595 } 2596 int security_bpf_map(struct bpf_map *map, fmode_t fmode) 2597 { 2598 return call_int_hook(bpf_map, 0, map, fmode); 2599 } 2600 int security_bpf_prog(struct bpf_prog *prog) 2601 { 2602 return call_int_hook(bpf_prog, 0, prog); 2603 } 2604 int security_bpf_map_alloc(struct bpf_map *map) 2605 { 2606 return call_int_hook(bpf_map_alloc_security, 0, map); 2607 } 2608 int security_bpf_prog_alloc(struct bpf_prog_aux *aux) 2609 { 2610 return call_int_hook(bpf_prog_alloc_security, 0, aux); 2611 } 2612 void security_bpf_map_free(struct bpf_map *map) 2613 { 2614 call_void_hook(bpf_map_free_security, map); 2615 } 2616 void security_bpf_prog_free(struct bpf_prog_aux *aux) 2617 { 2618 call_void_hook(bpf_prog_free_security, aux); 2619 } 2620 #endif /* CONFIG_BPF_SYSCALL */ 2621 2622 int security_locked_down(enum lockdown_reason what) 2623 { 2624 return call_int_hook(locked_down, 0, what); 2625 } 2626 EXPORT_SYMBOL(security_locked_down); 2627 2628 #ifdef CONFIG_PERF_EVENTS 2629 int security_perf_event_open(struct perf_event_attr *attr, int type) 2630 { 2631 return call_int_hook(perf_event_open, 0, attr, type); 2632 } 2633 2634 int security_perf_event_alloc(struct perf_event *event) 2635 { 2636 return call_int_hook(perf_event_alloc, 0, event); 2637 } 2638 2639 void security_perf_event_free(struct perf_event *event) 2640 { 2641 call_void_hook(perf_event_free, event); 2642 } 2643 2644 int security_perf_event_read(struct perf_event *event) 2645 { 2646 return call_int_hook(perf_event_read, 0, event); 2647 } 2648 2649 int security_perf_event_write(struct perf_event *event) 2650 { 2651 return call_int_hook(perf_event_write, 0, event); 2652 } 2653 #endif /* CONFIG_PERF_EVENTS */ 2654 2655 #ifdef CONFIG_IO_URING 2656 int security_uring_override_creds(const struct cred *new) 2657 { 2658 return call_int_hook(uring_override_creds, 0, new); 2659 } 2660 2661 int security_uring_sqpoll(void) 2662 { 2663 return call_int_hook(uring_sqpoll, 0); 2664 } 2665 #endif /* CONFIG_IO_URING */ 2666