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_DEVICE_TREE] = "modifying device tree contents", 56 [LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage", 57 [LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO", 58 [LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters", 59 [LOCKDOWN_MMIOTRACE] = "unsafe mmio", 60 [LOCKDOWN_DEBUGFS] = "debugfs access", 61 [LOCKDOWN_XMON_WR] = "xmon write access", 62 [LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM", 63 [LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM", 64 [LOCKDOWN_INTEGRITY_MAX] = "integrity", 65 [LOCKDOWN_KCORE] = "/proc/kcore access", 66 [LOCKDOWN_KPROBES] = "use of kprobes", 67 [LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM", 68 [LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM", 69 [LOCKDOWN_PERF] = "unsafe use of perf", 70 [LOCKDOWN_TRACEFS] = "use of tracefs", 71 [LOCKDOWN_XMON_RW] = "xmon read and write access", 72 [LOCKDOWN_XFRM_SECRET] = "xfrm SA secret", 73 [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality", 74 }; 75 76 struct security_hook_heads security_hook_heads __lsm_ro_after_init; 77 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain); 78 79 static struct kmem_cache *lsm_file_cache; 80 static struct kmem_cache *lsm_inode_cache; 81 82 char *lsm_names; 83 static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init; 84 85 /* Boot-time LSM user choice */ 86 static __initdata const char *chosen_lsm_order; 87 static __initdata const char *chosen_major_lsm; 88 89 static __initconst const char * const builtin_lsm_order = CONFIG_LSM; 90 91 /* Ordered list of LSMs to initialize. */ 92 static __initdata struct lsm_info **ordered_lsms; 93 static __initdata struct lsm_info *exclusive; 94 95 static __initdata bool debug; 96 #define init_debug(...) \ 97 do { \ 98 if (debug) \ 99 pr_info(__VA_ARGS__); \ 100 } while (0) 101 102 static bool __init is_enabled(struct lsm_info *lsm) 103 { 104 if (!lsm->enabled) 105 return false; 106 107 return *lsm->enabled; 108 } 109 110 /* Mark an LSM's enabled flag. */ 111 static int lsm_enabled_true __initdata = 1; 112 static int lsm_enabled_false __initdata = 0; 113 static void __init set_enabled(struct lsm_info *lsm, bool enabled) 114 { 115 /* 116 * When an LSM hasn't configured an enable variable, we can use 117 * a hard-coded location for storing the default enabled state. 118 */ 119 if (!lsm->enabled) { 120 if (enabled) 121 lsm->enabled = &lsm_enabled_true; 122 else 123 lsm->enabled = &lsm_enabled_false; 124 } else if (lsm->enabled == &lsm_enabled_true) { 125 if (!enabled) 126 lsm->enabled = &lsm_enabled_false; 127 } else if (lsm->enabled == &lsm_enabled_false) { 128 if (enabled) 129 lsm->enabled = &lsm_enabled_true; 130 } else { 131 *lsm->enabled = enabled; 132 } 133 } 134 135 /* Is an LSM already listed in the ordered LSMs list? */ 136 static bool __init exists_ordered_lsm(struct lsm_info *lsm) 137 { 138 struct lsm_info **check; 139 140 for (check = ordered_lsms; *check; check++) 141 if (*check == lsm) 142 return true; 143 144 return false; 145 } 146 147 /* Append an LSM to the list of ordered LSMs to initialize. */ 148 static int last_lsm __initdata; 149 static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from) 150 { 151 /* Ignore duplicate selections. */ 152 if (exists_ordered_lsm(lsm)) 153 return; 154 155 if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from)) 156 return; 157 158 /* Enable this LSM, if it is not already set. */ 159 if (!lsm->enabled) 160 lsm->enabled = &lsm_enabled_true; 161 ordered_lsms[last_lsm++] = lsm; 162 163 init_debug("%s ordering: %s (%sabled)\n", from, lsm->name, 164 is_enabled(lsm) ? "en" : "dis"); 165 } 166 167 /* Is an LSM allowed to be initialized? */ 168 static bool __init lsm_allowed(struct lsm_info *lsm) 169 { 170 /* Skip if the LSM is disabled. */ 171 if (!is_enabled(lsm)) 172 return false; 173 174 /* Not allowed if another exclusive LSM already initialized. */ 175 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) { 176 init_debug("exclusive disabled: %s\n", lsm->name); 177 return false; 178 } 179 180 return true; 181 } 182 183 static void __init lsm_set_blob_size(int *need, int *lbs) 184 { 185 int offset; 186 187 if (*need > 0) { 188 offset = *lbs; 189 *lbs += *need; 190 *need = offset; 191 } 192 } 193 194 static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed) 195 { 196 if (!needed) 197 return; 198 199 lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred); 200 lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file); 201 /* 202 * The inode blob gets an rcu_head in addition to 203 * what the modules might need. 204 */ 205 if (needed->lbs_inode && blob_sizes.lbs_inode == 0) 206 blob_sizes.lbs_inode = sizeof(struct rcu_head); 207 lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode); 208 lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc); 209 lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg); 210 lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock); 211 lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task); 212 } 213 214 /* Prepare LSM for initialization. */ 215 static void __init prepare_lsm(struct lsm_info *lsm) 216 { 217 int enabled = lsm_allowed(lsm); 218 219 /* Record enablement (to handle any following exclusive LSMs). */ 220 set_enabled(lsm, enabled); 221 222 /* If enabled, do pre-initialization work. */ 223 if (enabled) { 224 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) { 225 exclusive = lsm; 226 init_debug("exclusive chosen: %s\n", lsm->name); 227 } 228 229 lsm_set_blob_sizes(lsm->blobs); 230 } 231 } 232 233 /* Initialize a given LSM, if it is enabled. */ 234 static void __init initialize_lsm(struct lsm_info *lsm) 235 { 236 if (is_enabled(lsm)) { 237 int ret; 238 239 init_debug("initializing %s\n", lsm->name); 240 ret = lsm->init(); 241 WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret); 242 } 243 } 244 245 /* Populate ordered LSMs list from comma-separated LSM name list. */ 246 static void __init ordered_lsm_parse(const char *order, const char *origin) 247 { 248 struct lsm_info *lsm; 249 char *sep, *name, *next; 250 251 /* LSM_ORDER_FIRST is always first. */ 252 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 253 if (lsm->order == LSM_ORDER_FIRST) 254 append_ordered_lsm(lsm, "first"); 255 } 256 257 /* Process "security=", if given. */ 258 if (chosen_major_lsm) { 259 struct lsm_info *major; 260 261 /* 262 * To match the original "security=" behavior, this 263 * explicitly does NOT fallback to another Legacy Major 264 * if the selected one was separately disabled: disable 265 * all non-matching Legacy Major LSMs. 266 */ 267 for (major = __start_lsm_info; major < __end_lsm_info; 268 major++) { 269 if ((major->flags & LSM_FLAG_LEGACY_MAJOR) && 270 strcmp(major->name, chosen_major_lsm) != 0) { 271 set_enabled(major, false); 272 init_debug("security=%s disabled: %s\n", 273 chosen_major_lsm, major->name); 274 } 275 } 276 } 277 278 sep = kstrdup(order, GFP_KERNEL); 279 next = sep; 280 /* Walk the list, looking for matching LSMs. */ 281 while ((name = strsep(&next, ",")) != NULL) { 282 bool found = false; 283 284 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 285 if (lsm->order == LSM_ORDER_MUTABLE && 286 strcmp(lsm->name, name) == 0) { 287 append_ordered_lsm(lsm, origin); 288 found = true; 289 } 290 } 291 292 if (!found) 293 init_debug("%s ignored: %s\n", origin, name); 294 } 295 296 /* Process "security=", if given. */ 297 if (chosen_major_lsm) { 298 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 299 if (exists_ordered_lsm(lsm)) 300 continue; 301 if (strcmp(lsm->name, chosen_major_lsm) == 0) 302 append_ordered_lsm(lsm, "security="); 303 } 304 } 305 306 /* Disable all LSMs not in the ordered list. */ 307 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 308 if (exists_ordered_lsm(lsm)) 309 continue; 310 set_enabled(lsm, false); 311 init_debug("%s disabled: %s\n", origin, lsm->name); 312 } 313 314 kfree(sep); 315 } 316 317 static void __init lsm_early_cred(struct cred *cred); 318 static void __init lsm_early_task(struct task_struct *task); 319 320 static int lsm_append(const char *new, char **result); 321 322 static void __init ordered_lsm_init(void) 323 { 324 struct lsm_info **lsm; 325 326 ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms), 327 GFP_KERNEL); 328 329 if (chosen_lsm_order) { 330 if (chosen_major_lsm) { 331 pr_info("security= is ignored because it is superseded by lsm=\n"); 332 chosen_major_lsm = NULL; 333 } 334 ordered_lsm_parse(chosen_lsm_order, "cmdline"); 335 } else 336 ordered_lsm_parse(builtin_lsm_order, "builtin"); 337 338 for (lsm = ordered_lsms; *lsm; lsm++) 339 prepare_lsm(*lsm); 340 341 init_debug("cred blob size = %d\n", blob_sizes.lbs_cred); 342 init_debug("file blob size = %d\n", blob_sizes.lbs_file); 343 init_debug("inode blob size = %d\n", blob_sizes.lbs_inode); 344 init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc); 345 init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg); 346 init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock); 347 init_debug("task blob size = %d\n", blob_sizes.lbs_task); 348 349 /* 350 * Create any kmem_caches needed for blobs 351 */ 352 if (blob_sizes.lbs_file) 353 lsm_file_cache = kmem_cache_create("lsm_file_cache", 354 blob_sizes.lbs_file, 0, 355 SLAB_PANIC, NULL); 356 if (blob_sizes.lbs_inode) 357 lsm_inode_cache = kmem_cache_create("lsm_inode_cache", 358 blob_sizes.lbs_inode, 0, 359 SLAB_PANIC, NULL); 360 361 lsm_early_cred((struct cred *) current->cred); 362 lsm_early_task(current); 363 for (lsm = ordered_lsms; *lsm; lsm++) 364 initialize_lsm(*lsm); 365 366 kfree(ordered_lsms); 367 } 368 369 int __init early_security_init(void) 370 { 371 struct lsm_info *lsm; 372 373 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \ 374 INIT_HLIST_HEAD(&security_hook_heads.NAME); 375 #include "linux/lsm_hook_defs.h" 376 #undef LSM_HOOK 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 const 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 return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir, 1203 new_dentry, flags); 1204 } 1205 EXPORT_SYMBOL(security_path_rename); 1206 1207 int security_path_truncate(const struct path *path) 1208 { 1209 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1210 return 0; 1211 return call_int_hook(path_truncate, 0, path); 1212 } 1213 1214 int security_path_chmod(const struct path *path, umode_t mode) 1215 { 1216 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1217 return 0; 1218 return call_int_hook(path_chmod, 0, path, mode); 1219 } 1220 1221 int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) 1222 { 1223 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1224 return 0; 1225 return call_int_hook(path_chown, 0, path, uid, gid); 1226 } 1227 1228 int security_path_chroot(const struct path *path) 1229 { 1230 return call_int_hook(path_chroot, 0, path); 1231 } 1232 #endif 1233 1234 int security_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode) 1235 { 1236 if (unlikely(IS_PRIVATE(dir))) 1237 return 0; 1238 return call_int_hook(inode_create, 0, dir, dentry, mode); 1239 } 1240 EXPORT_SYMBOL_GPL(security_inode_create); 1241 1242 int security_inode_link(struct dentry *old_dentry, struct inode *dir, 1243 struct dentry *new_dentry) 1244 { 1245 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)))) 1246 return 0; 1247 return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry); 1248 } 1249 1250 int security_inode_unlink(struct inode *dir, struct dentry *dentry) 1251 { 1252 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1253 return 0; 1254 return call_int_hook(inode_unlink, 0, dir, dentry); 1255 } 1256 1257 int security_inode_symlink(struct inode *dir, struct dentry *dentry, 1258 const char *old_name) 1259 { 1260 if (unlikely(IS_PRIVATE(dir))) 1261 return 0; 1262 return call_int_hook(inode_symlink, 0, dir, dentry, old_name); 1263 } 1264 1265 int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1266 { 1267 if (unlikely(IS_PRIVATE(dir))) 1268 return 0; 1269 return call_int_hook(inode_mkdir, 0, dir, dentry, mode); 1270 } 1271 EXPORT_SYMBOL_GPL(security_inode_mkdir); 1272 1273 int security_inode_rmdir(struct inode *dir, struct dentry *dentry) 1274 { 1275 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1276 return 0; 1277 return call_int_hook(inode_rmdir, 0, dir, dentry); 1278 } 1279 1280 int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 1281 { 1282 if (unlikely(IS_PRIVATE(dir))) 1283 return 0; 1284 return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev); 1285 } 1286 1287 int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry, 1288 struct inode *new_dir, struct dentry *new_dentry, 1289 unsigned int flags) 1290 { 1291 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) || 1292 (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry))))) 1293 return 0; 1294 1295 if (flags & RENAME_EXCHANGE) { 1296 int err = call_int_hook(inode_rename, 0, new_dir, new_dentry, 1297 old_dir, old_dentry); 1298 if (err) 1299 return err; 1300 } 1301 1302 return call_int_hook(inode_rename, 0, old_dir, old_dentry, 1303 new_dir, new_dentry); 1304 } 1305 1306 int security_inode_readlink(struct dentry *dentry) 1307 { 1308 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1309 return 0; 1310 return call_int_hook(inode_readlink, 0, dentry); 1311 } 1312 1313 int security_inode_follow_link(struct dentry *dentry, struct inode *inode, 1314 bool rcu) 1315 { 1316 if (unlikely(IS_PRIVATE(inode))) 1317 return 0; 1318 return call_int_hook(inode_follow_link, 0, dentry, inode, rcu); 1319 } 1320 1321 int security_inode_permission(struct inode *inode, int mask) 1322 { 1323 if (unlikely(IS_PRIVATE(inode))) 1324 return 0; 1325 return call_int_hook(inode_permission, 0, inode, mask); 1326 } 1327 1328 int security_inode_setattr(struct user_namespace *mnt_userns, 1329 struct dentry *dentry, struct iattr *attr) 1330 { 1331 int ret; 1332 1333 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1334 return 0; 1335 ret = call_int_hook(inode_setattr, 0, dentry, attr); 1336 if (ret) 1337 return ret; 1338 return evm_inode_setattr(mnt_userns, dentry, attr); 1339 } 1340 EXPORT_SYMBOL_GPL(security_inode_setattr); 1341 1342 int security_inode_getattr(const struct path *path) 1343 { 1344 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1345 return 0; 1346 return call_int_hook(inode_getattr, 0, path); 1347 } 1348 1349 int security_inode_setxattr(struct user_namespace *mnt_userns, 1350 struct dentry *dentry, const char *name, 1351 const void *value, size_t size, int flags) 1352 { 1353 int ret; 1354 1355 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1356 return 0; 1357 /* 1358 * SELinux and Smack integrate the cap call, 1359 * so assume that all LSMs supplying this call do so. 1360 */ 1361 ret = call_int_hook(inode_setxattr, 1, mnt_userns, dentry, name, value, 1362 size, flags); 1363 1364 if (ret == 1) 1365 ret = cap_inode_setxattr(dentry, name, value, size, flags); 1366 if (ret) 1367 return ret; 1368 ret = ima_inode_setxattr(dentry, name, value, size); 1369 if (ret) 1370 return ret; 1371 return evm_inode_setxattr(mnt_userns, dentry, name, value, size); 1372 } 1373 1374 void security_inode_post_setxattr(struct dentry *dentry, const char *name, 1375 const void *value, size_t size, int flags) 1376 { 1377 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1378 return; 1379 call_void_hook(inode_post_setxattr, dentry, name, value, size, flags); 1380 evm_inode_post_setxattr(dentry, name, value, size); 1381 } 1382 1383 int security_inode_getxattr(struct dentry *dentry, const char *name) 1384 { 1385 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1386 return 0; 1387 return call_int_hook(inode_getxattr, 0, dentry, name); 1388 } 1389 1390 int security_inode_listxattr(struct dentry *dentry) 1391 { 1392 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1393 return 0; 1394 return call_int_hook(inode_listxattr, 0, dentry); 1395 } 1396 1397 int security_inode_removexattr(struct user_namespace *mnt_userns, 1398 struct dentry *dentry, const char *name) 1399 { 1400 int ret; 1401 1402 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1403 return 0; 1404 /* 1405 * SELinux and Smack integrate the cap call, 1406 * so assume that all LSMs supplying this call do so. 1407 */ 1408 ret = call_int_hook(inode_removexattr, 1, mnt_userns, dentry, name); 1409 if (ret == 1) 1410 ret = cap_inode_removexattr(mnt_userns, dentry, name); 1411 if (ret) 1412 return ret; 1413 ret = ima_inode_removexattr(dentry, name); 1414 if (ret) 1415 return ret; 1416 return evm_inode_removexattr(mnt_userns, dentry, name); 1417 } 1418 1419 int security_inode_need_killpriv(struct dentry *dentry) 1420 { 1421 return call_int_hook(inode_need_killpriv, 0, dentry); 1422 } 1423 1424 int security_inode_killpriv(struct user_namespace *mnt_userns, 1425 struct dentry *dentry) 1426 { 1427 return call_int_hook(inode_killpriv, 0, mnt_userns, dentry); 1428 } 1429 1430 int security_inode_getsecurity(struct user_namespace *mnt_userns, 1431 struct inode *inode, const char *name, 1432 void **buffer, bool alloc) 1433 { 1434 struct security_hook_list *hp; 1435 int rc; 1436 1437 if (unlikely(IS_PRIVATE(inode))) 1438 return LSM_RET_DEFAULT(inode_getsecurity); 1439 /* 1440 * Only one module will provide an attribute with a given name. 1441 */ 1442 hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) { 1443 rc = hp->hook.inode_getsecurity(mnt_userns, inode, name, buffer, alloc); 1444 if (rc != LSM_RET_DEFAULT(inode_getsecurity)) 1445 return rc; 1446 } 1447 return LSM_RET_DEFAULT(inode_getsecurity); 1448 } 1449 1450 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags) 1451 { 1452 struct security_hook_list *hp; 1453 int rc; 1454 1455 if (unlikely(IS_PRIVATE(inode))) 1456 return LSM_RET_DEFAULT(inode_setsecurity); 1457 /* 1458 * Only one module will provide an attribute with a given name. 1459 */ 1460 hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) { 1461 rc = hp->hook.inode_setsecurity(inode, name, value, size, 1462 flags); 1463 if (rc != LSM_RET_DEFAULT(inode_setsecurity)) 1464 return rc; 1465 } 1466 return LSM_RET_DEFAULT(inode_setsecurity); 1467 } 1468 1469 int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) 1470 { 1471 if (unlikely(IS_PRIVATE(inode))) 1472 return 0; 1473 return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size); 1474 } 1475 EXPORT_SYMBOL(security_inode_listsecurity); 1476 1477 void security_inode_getsecid(struct inode *inode, u32 *secid) 1478 { 1479 call_void_hook(inode_getsecid, inode, secid); 1480 } 1481 1482 int security_inode_copy_up(struct dentry *src, struct cred **new) 1483 { 1484 return call_int_hook(inode_copy_up, 0, src, new); 1485 } 1486 EXPORT_SYMBOL(security_inode_copy_up); 1487 1488 int security_inode_copy_up_xattr(const char *name) 1489 { 1490 struct security_hook_list *hp; 1491 int rc; 1492 1493 /* 1494 * The implementation can return 0 (accept the xattr), 1 (discard the 1495 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or 1496 * any other error code incase of an error. 1497 */ 1498 hlist_for_each_entry(hp, 1499 &security_hook_heads.inode_copy_up_xattr, list) { 1500 rc = hp->hook.inode_copy_up_xattr(name); 1501 if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr)) 1502 return rc; 1503 } 1504 1505 return LSM_RET_DEFAULT(inode_copy_up_xattr); 1506 } 1507 EXPORT_SYMBOL(security_inode_copy_up_xattr); 1508 1509 int security_kernfs_init_security(struct kernfs_node *kn_dir, 1510 struct kernfs_node *kn) 1511 { 1512 return call_int_hook(kernfs_init_security, 0, kn_dir, kn); 1513 } 1514 1515 int security_file_permission(struct file *file, int mask) 1516 { 1517 int ret; 1518 1519 ret = call_int_hook(file_permission, 0, file, mask); 1520 if (ret) 1521 return ret; 1522 1523 return fsnotify_perm(file, mask); 1524 } 1525 1526 int security_file_alloc(struct file *file) 1527 { 1528 int rc = lsm_file_alloc(file); 1529 1530 if (rc) 1531 return rc; 1532 rc = call_int_hook(file_alloc_security, 0, file); 1533 if (unlikely(rc)) 1534 security_file_free(file); 1535 return rc; 1536 } 1537 1538 void security_file_free(struct file *file) 1539 { 1540 void *blob; 1541 1542 call_void_hook(file_free_security, file); 1543 1544 blob = file->f_security; 1545 if (blob) { 1546 file->f_security = NULL; 1547 kmem_cache_free(lsm_file_cache, blob); 1548 } 1549 } 1550 1551 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1552 { 1553 return call_int_hook(file_ioctl, 0, file, cmd, arg); 1554 } 1555 EXPORT_SYMBOL_GPL(security_file_ioctl); 1556 1557 static inline unsigned long mmap_prot(struct file *file, unsigned long prot) 1558 { 1559 /* 1560 * Does we have PROT_READ and does the application expect 1561 * it to imply PROT_EXEC? If not, nothing to talk about... 1562 */ 1563 if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ) 1564 return prot; 1565 if (!(current->personality & READ_IMPLIES_EXEC)) 1566 return prot; 1567 /* 1568 * if that's an anonymous mapping, let it. 1569 */ 1570 if (!file) 1571 return prot | PROT_EXEC; 1572 /* 1573 * ditto if it's not on noexec mount, except that on !MMU we need 1574 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case 1575 */ 1576 if (!path_noexec(&file->f_path)) { 1577 #ifndef CONFIG_MMU 1578 if (file->f_op->mmap_capabilities) { 1579 unsigned caps = file->f_op->mmap_capabilities(file); 1580 if (!(caps & NOMMU_MAP_EXEC)) 1581 return prot; 1582 } 1583 #endif 1584 return prot | PROT_EXEC; 1585 } 1586 /* anything on noexec mount won't get PROT_EXEC */ 1587 return prot; 1588 } 1589 1590 int security_mmap_file(struct file *file, unsigned long prot, 1591 unsigned long flags) 1592 { 1593 int ret; 1594 ret = call_int_hook(mmap_file, 0, file, prot, 1595 mmap_prot(file, prot), flags); 1596 if (ret) 1597 return ret; 1598 return ima_file_mmap(file, prot); 1599 } 1600 1601 int security_mmap_addr(unsigned long addr) 1602 { 1603 return call_int_hook(mmap_addr, 0, addr); 1604 } 1605 1606 int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, 1607 unsigned long prot) 1608 { 1609 int ret; 1610 1611 ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot); 1612 if (ret) 1613 return ret; 1614 return ima_file_mprotect(vma, prot); 1615 } 1616 1617 int security_file_lock(struct file *file, unsigned int cmd) 1618 { 1619 return call_int_hook(file_lock, 0, file, cmd); 1620 } 1621 1622 int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg) 1623 { 1624 return call_int_hook(file_fcntl, 0, file, cmd, arg); 1625 } 1626 1627 void security_file_set_fowner(struct file *file) 1628 { 1629 call_void_hook(file_set_fowner, file); 1630 } 1631 1632 int security_file_send_sigiotask(struct task_struct *tsk, 1633 struct fown_struct *fown, int sig) 1634 { 1635 return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig); 1636 } 1637 1638 int security_file_receive(struct file *file) 1639 { 1640 return call_int_hook(file_receive, 0, file); 1641 } 1642 1643 int security_file_open(struct file *file) 1644 { 1645 int ret; 1646 1647 ret = call_int_hook(file_open, 0, file); 1648 if (ret) 1649 return ret; 1650 1651 return fsnotify_perm(file, MAY_OPEN); 1652 } 1653 1654 int security_task_alloc(struct task_struct *task, unsigned long clone_flags) 1655 { 1656 int rc = lsm_task_alloc(task); 1657 1658 if (rc) 1659 return rc; 1660 rc = call_int_hook(task_alloc, 0, task, clone_flags); 1661 if (unlikely(rc)) 1662 security_task_free(task); 1663 return rc; 1664 } 1665 1666 void security_task_free(struct task_struct *task) 1667 { 1668 call_void_hook(task_free, task); 1669 1670 kfree(task->security); 1671 task->security = NULL; 1672 } 1673 1674 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp) 1675 { 1676 int rc = lsm_cred_alloc(cred, gfp); 1677 1678 if (rc) 1679 return rc; 1680 1681 rc = call_int_hook(cred_alloc_blank, 0, cred, gfp); 1682 if (unlikely(rc)) 1683 security_cred_free(cred); 1684 return rc; 1685 } 1686 1687 void security_cred_free(struct cred *cred) 1688 { 1689 /* 1690 * There is a failure case in prepare_creds() that 1691 * may result in a call here with ->security being NULL. 1692 */ 1693 if (unlikely(cred->security == NULL)) 1694 return; 1695 1696 call_void_hook(cred_free, cred); 1697 1698 kfree(cred->security); 1699 cred->security = NULL; 1700 } 1701 1702 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp) 1703 { 1704 int rc = lsm_cred_alloc(new, gfp); 1705 1706 if (rc) 1707 return rc; 1708 1709 rc = call_int_hook(cred_prepare, 0, new, old, gfp); 1710 if (unlikely(rc)) 1711 security_cred_free(new); 1712 return rc; 1713 } 1714 1715 void security_transfer_creds(struct cred *new, const struct cred *old) 1716 { 1717 call_void_hook(cred_transfer, new, old); 1718 } 1719 1720 void security_cred_getsecid(const struct cred *c, u32 *secid) 1721 { 1722 *secid = 0; 1723 call_void_hook(cred_getsecid, c, secid); 1724 } 1725 EXPORT_SYMBOL(security_cred_getsecid); 1726 1727 int security_kernel_act_as(struct cred *new, u32 secid) 1728 { 1729 return call_int_hook(kernel_act_as, 0, new, secid); 1730 } 1731 1732 int security_kernel_create_files_as(struct cred *new, struct inode *inode) 1733 { 1734 return call_int_hook(kernel_create_files_as, 0, new, inode); 1735 } 1736 1737 int security_kernel_module_request(char *kmod_name) 1738 { 1739 int ret; 1740 1741 ret = call_int_hook(kernel_module_request, 0, kmod_name); 1742 if (ret) 1743 return ret; 1744 return integrity_kernel_module_request(kmod_name); 1745 } 1746 1747 int security_kernel_read_file(struct file *file, enum kernel_read_file_id id, 1748 bool contents) 1749 { 1750 int ret; 1751 1752 ret = call_int_hook(kernel_read_file, 0, file, id, contents); 1753 if (ret) 1754 return ret; 1755 return ima_read_file(file, id, contents); 1756 } 1757 EXPORT_SYMBOL_GPL(security_kernel_read_file); 1758 1759 int security_kernel_post_read_file(struct file *file, char *buf, loff_t size, 1760 enum kernel_read_file_id id) 1761 { 1762 int ret; 1763 1764 ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id); 1765 if (ret) 1766 return ret; 1767 return ima_post_read_file(file, buf, size, id); 1768 } 1769 EXPORT_SYMBOL_GPL(security_kernel_post_read_file); 1770 1771 int security_kernel_load_data(enum kernel_load_data_id id, bool contents) 1772 { 1773 int ret; 1774 1775 ret = call_int_hook(kernel_load_data, 0, id, contents); 1776 if (ret) 1777 return ret; 1778 return ima_load_data(id, contents); 1779 } 1780 EXPORT_SYMBOL_GPL(security_kernel_load_data); 1781 1782 int security_kernel_post_load_data(char *buf, loff_t size, 1783 enum kernel_load_data_id id, 1784 char *description) 1785 { 1786 int ret; 1787 1788 ret = call_int_hook(kernel_post_load_data, 0, buf, size, id, 1789 description); 1790 if (ret) 1791 return ret; 1792 return ima_post_load_data(buf, size, id, description); 1793 } 1794 EXPORT_SYMBOL_GPL(security_kernel_post_load_data); 1795 1796 int security_task_fix_setuid(struct cred *new, const struct cred *old, 1797 int flags) 1798 { 1799 return call_int_hook(task_fix_setuid, 0, new, old, flags); 1800 } 1801 1802 int security_task_fix_setgid(struct cred *new, const struct cred *old, 1803 int flags) 1804 { 1805 return call_int_hook(task_fix_setgid, 0, new, old, flags); 1806 } 1807 1808 int security_task_fix_setgroups(struct cred *new, const struct cred *old) 1809 { 1810 return call_int_hook(task_fix_setgroups, 0, new, old); 1811 } 1812 1813 int security_task_setpgid(struct task_struct *p, pid_t pgid) 1814 { 1815 return call_int_hook(task_setpgid, 0, p, pgid); 1816 } 1817 1818 int security_task_getpgid(struct task_struct *p) 1819 { 1820 return call_int_hook(task_getpgid, 0, p); 1821 } 1822 1823 int security_task_getsid(struct task_struct *p) 1824 { 1825 return call_int_hook(task_getsid, 0, p); 1826 } 1827 1828 void security_current_getsecid_subj(u32 *secid) 1829 { 1830 *secid = 0; 1831 call_void_hook(current_getsecid_subj, secid); 1832 } 1833 EXPORT_SYMBOL(security_current_getsecid_subj); 1834 1835 void security_task_getsecid_obj(struct task_struct *p, u32 *secid) 1836 { 1837 *secid = 0; 1838 call_void_hook(task_getsecid_obj, p, secid); 1839 } 1840 EXPORT_SYMBOL(security_task_getsecid_obj); 1841 1842 int security_task_setnice(struct task_struct *p, int nice) 1843 { 1844 return call_int_hook(task_setnice, 0, p, nice); 1845 } 1846 1847 int security_task_setioprio(struct task_struct *p, int ioprio) 1848 { 1849 return call_int_hook(task_setioprio, 0, p, ioprio); 1850 } 1851 1852 int security_task_getioprio(struct task_struct *p) 1853 { 1854 return call_int_hook(task_getioprio, 0, p); 1855 } 1856 1857 int security_task_prlimit(const struct cred *cred, const struct cred *tcred, 1858 unsigned int flags) 1859 { 1860 return call_int_hook(task_prlimit, 0, cred, tcred, flags); 1861 } 1862 1863 int security_task_setrlimit(struct task_struct *p, unsigned int resource, 1864 struct rlimit *new_rlim) 1865 { 1866 return call_int_hook(task_setrlimit, 0, p, resource, new_rlim); 1867 } 1868 1869 int security_task_setscheduler(struct task_struct *p) 1870 { 1871 return call_int_hook(task_setscheduler, 0, p); 1872 } 1873 1874 int security_task_getscheduler(struct task_struct *p) 1875 { 1876 return call_int_hook(task_getscheduler, 0, p); 1877 } 1878 1879 int security_task_movememory(struct task_struct *p) 1880 { 1881 return call_int_hook(task_movememory, 0, p); 1882 } 1883 1884 int security_task_kill(struct task_struct *p, struct kernel_siginfo *info, 1885 int sig, const struct cred *cred) 1886 { 1887 return call_int_hook(task_kill, 0, p, info, sig, cred); 1888 } 1889 1890 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3, 1891 unsigned long arg4, unsigned long arg5) 1892 { 1893 int thisrc; 1894 int rc = LSM_RET_DEFAULT(task_prctl); 1895 struct security_hook_list *hp; 1896 1897 hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) { 1898 thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5); 1899 if (thisrc != LSM_RET_DEFAULT(task_prctl)) { 1900 rc = thisrc; 1901 if (thisrc != 0) 1902 break; 1903 } 1904 } 1905 return rc; 1906 } 1907 1908 void security_task_to_inode(struct task_struct *p, struct inode *inode) 1909 { 1910 call_void_hook(task_to_inode, p, inode); 1911 } 1912 1913 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag) 1914 { 1915 return call_int_hook(ipc_permission, 0, ipcp, flag); 1916 } 1917 1918 void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) 1919 { 1920 *secid = 0; 1921 call_void_hook(ipc_getsecid, ipcp, secid); 1922 } 1923 1924 int security_msg_msg_alloc(struct msg_msg *msg) 1925 { 1926 int rc = lsm_msg_msg_alloc(msg); 1927 1928 if (unlikely(rc)) 1929 return rc; 1930 rc = call_int_hook(msg_msg_alloc_security, 0, msg); 1931 if (unlikely(rc)) 1932 security_msg_msg_free(msg); 1933 return rc; 1934 } 1935 1936 void security_msg_msg_free(struct msg_msg *msg) 1937 { 1938 call_void_hook(msg_msg_free_security, msg); 1939 kfree(msg->security); 1940 msg->security = NULL; 1941 } 1942 1943 int security_msg_queue_alloc(struct kern_ipc_perm *msq) 1944 { 1945 int rc = lsm_ipc_alloc(msq); 1946 1947 if (unlikely(rc)) 1948 return rc; 1949 rc = call_int_hook(msg_queue_alloc_security, 0, msq); 1950 if (unlikely(rc)) 1951 security_msg_queue_free(msq); 1952 return rc; 1953 } 1954 1955 void security_msg_queue_free(struct kern_ipc_perm *msq) 1956 { 1957 call_void_hook(msg_queue_free_security, msq); 1958 kfree(msq->security); 1959 msq->security = NULL; 1960 } 1961 1962 int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) 1963 { 1964 return call_int_hook(msg_queue_associate, 0, msq, msqflg); 1965 } 1966 1967 int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd) 1968 { 1969 return call_int_hook(msg_queue_msgctl, 0, msq, cmd); 1970 } 1971 1972 int security_msg_queue_msgsnd(struct kern_ipc_perm *msq, 1973 struct msg_msg *msg, int msqflg) 1974 { 1975 return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg); 1976 } 1977 1978 int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, 1979 struct task_struct *target, long type, int mode) 1980 { 1981 return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode); 1982 } 1983 1984 int security_shm_alloc(struct kern_ipc_perm *shp) 1985 { 1986 int rc = lsm_ipc_alloc(shp); 1987 1988 if (unlikely(rc)) 1989 return rc; 1990 rc = call_int_hook(shm_alloc_security, 0, shp); 1991 if (unlikely(rc)) 1992 security_shm_free(shp); 1993 return rc; 1994 } 1995 1996 void security_shm_free(struct kern_ipc_perm *shp) 1997 { 1998 call_void_hook(shm_free_security, shp); 1999 kfree(shp->security); 2000 shp->security = NULL; 2001 } 2002 2003 int security_shm_associate(struct kern_ipc_perm *shp, int shmflg) 2004 { 2005 return call_int_hook(shm_associate, 0, shp, shmflg); 2006 } 2007 2008 int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd) 2009 { 2010 return call_int_hook(shm_shmctl, 0, shp, cmd); 2011 } 2012 2013 int security_shm_shmat(struct kern_ipc_perm *shp, char __user *shmaddr, int shmflg) 2014 { 2015 return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg); 2016 } 2017 2018 int security_sem_alloc(struct kern_ipc_perm *sma) 2019 { 2020 int rc = lsm_ipc_alloc(sma); 2021 2022 if (unlikely(rc)) 2023 return rc; 2024 rc = call_int_hook(sem_alloc_security, 0, sma); 2025 if (unlikely(rc)) 2026 security_sem_free(sma); 2027 return rc; 2028 } 2029 2030 void security_sem_free(struct kern_ipc_perm *sma) 2031 { 2032 call_void_hook(sem_free_security, sma); 2033 kfree(sma->security); 2034 sma->security = NULL; 2035 } 2036 2037 int security_sem_associate(struct kern_ipc_perm *sma, int semflg) 2038 { 2039 return call_int_hook(sem_associate, 0, sma, semflg); 2040 } 2041 2042 int security_sem_semctl(struct kern_ipc_perm *sma, int cmd) 2043 { 2044 return call_int_hook(sem_semctl, 0, sma, cmd); 2045 } 2046 2047 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops, 2048 unsigned nsops, int alter) 2049 { 2050 return call_int_hook(sem_semop, 0, sma, sops, nsops, alter); 2051 } 2052 2053 void security_d_instantiate(struct dentry *dentry, struct inode *inode) 2054 { 2055 if (unlikely(inode && IS_PRIVATE(inode))) 2056 return; 2057 call_void_hook(d_instantiate, dentry, inode); 2058 } 2059 EXPORT_SYMBOL(security_d_instantiate); 2060 2061 int security_getprocattr(struct task_struct *p, const char *lsm, char *name, 2062 char **value) 2063 { 2064 struct security_hook_list *hp; 2065 2066 hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) { 2067 if (lsm != NULL && strcmp(lsm, hp->lsm)) 2068 continue; 2069 return hp->hook.getprocattr(p, name, value); 2070 } 2071 return LSM_RET_DEFAULT(getprocattr); 2072 } 2073 2074 int security_setprocattr(const char *lsm, const char *name, void *value, 2075 size_t size) 2076 { 2077 struct security_hook_list *hp; 2078 2079 hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) { 2080 if (lsm != NULL && strcmp(lsm, hp->lsm)) 2081 continue; 2082 return hp->hook.setprocattr(name, value, size); 2083 } 2084 return LSM_RET_DEFAULT(setprocattr); 2085 } 2086 2087 int security_netlink_send(struct sock *sk, struct sk_buff *skb) 2088 { 2089 return call_int_hook(netlink_send, 0, sk, skb); 2090 } 2091 2092 int security_ismaclabel(const char *name) 2093 { 2094 return call_int_hook(ismaclabel, 0, name); 2095 } 2096 EXPORT_SYMBOL(security_ismaclabel); 2097 2098 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) 2099 { 2100 struct security_hook_list *hp; 2101 int rc; 2102 2103 /* 2104 * Currently, only one LSM can implement secid_to_secctx (i.e this 2105 * LSM hook is not "stackable"). 2106 */ 2107 hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) { 2108 rc = hp->hook.secid_to_secctx(secid, secdata, seclen); 2109 if (rc != LSM_RET_DEFAULT(secid_to_secctx)) 2110 return rc; 2111 } 2112 2113 return LSM_RET_DEFAULT(secid_to_secctx); 2114 } 2115 EXPORT_SYMBOL(security_secid_to_secctx); 2116 2117 int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) 2118 { 2119 *secid = 0; 2120 return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid); 2121 } 2122 EXPORT_SYMBOL(security_secctx_to_secid); 2123 2124 void security_release_secctx(char *secdata, u32 seclen) 2125 { 2126 call_void_hook(release_secctx, secdata, seclen); 2127 } 2128 EXPORT_SYMBOL(security_release_secctx); 2129 2130 void security_inode_invalidate_secctx(struct inode *inode) 2131 { 2132 call_void_hook(inode_invalidate_secctx, inode); 2133 } 2134 EXPORT_SYMBOL(security_inode_invalidate_secctx); 2135 2136 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) 2137 { 2138 return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen); 2139 } 2140 EXPORT_SYMBOL(security_inode_notifysecctx); 2141 2142 int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) 2143 { 2144 return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen); 2145 } 2146 EXPORT_SYMBOL(security_inode_setsecctx); 2147 2148 int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) 2149 { 2150 return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen); 2151 } 2152 EXPORT_SYMBOL(security_inode_getsecctx); 2153 2154 #ifdef CONFIG_WATCH_QUEUE 2155 int security_post_notification(const struct cred *w_cred, 2156 const struct cred *cred, 2157 struct watch_notification *n) 2158 { 2159 return call_int_hook(post_notification, 0, w_cred, cred, n); 2160 } 2161 #endif /* CONFIG_WATCH_QUEUE */ 2162 2163 #ifdef CONFIG_KEY_NOTIFICATIONS 2164 int security_watch_key(struct key *key) 2165 { 2166 return call_int_hook(watch_key, 0, key); 2167 } 2168 #endif 2169 2170 #ifdef CONFIG_SECURITY_NETWORK 2171 2172 int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk) 2173 { 2174 return call_int_hook(unix_stream_connect, 0, sock, other, newsk); 2175 } 2176 EXPORT_SYMBOL(security_unix_stream_connect); 2177 2178 int security_unix_may_send(struct socket *sock, struct socket *other) 2179 { 2180 return call_int_hook(unix_may_send, 0, sock, other); 2181 } 2182 EXPORT_SYMBOL(security_unix_may_send); 2183 2184 int security_socket_create(int family, int type, int protocol, int kern) 2185 { 2186 return call_int_hook(socket_create, 0, family, type, protocol, kern); 2187 } 2188 2189 int security_socket_post_create(struct socket *sock, int family, 2190 int type, int protocol, int kern) 2191 { 2192 return call_int_hook(socket_post_create, 0, sock, family, type, 2193 protocol, kern); 2194 } 2195 2196 int security_socket_socketpair(struct socket *socka, struct socket *sockb) 2197 { 2198 return call_int_hook(socket_socketpair, 0, socka, sockb); 2199 } 2200 EXPORT_SYMBOL(security_socket_socketpair); 2201 2202 int security_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) 2203 { 2204 return call_int_hook(socket_bind, 0, sock, address, addrlen); 2205 } 2206 2207 int security_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) 2208 { 2209 return call_int_hook(socket_connect, 0, sock, address, addrlen); 2210 } 2211 2212 int security_socket_listen(struct socket *sock, int backlog) 2213 { 2214 return call_int_hook(socket_listen, 0, sock, backlog); 2215 } 2216 2217 int security_socket_accept(struct socket *sock, struct socket *newsock) 2218 { 2219 return call_int_hook(socket_accept, 0, sock, newsock); 2220 } 2221 2222 int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size) 2223 { 2224 return call_int_hook(socket_sendmsg, 0, sock, msg, size); 2225 } 2226 2227 int security_socket_recvmsg(struct socket *sock, struct msghdr *msg, 2228 int size, int flags) 2229 { 2230 return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags); 2231 } 2232 2233 int security_socket_getsockname(struct socket *sock) 2234 { 2235 return call_int_hook(socket_getsockname, 0, sock); 2236 } 2237 2238 int security_socket_getpeername(struct socket *sock) 2239 { 2240 return call_int_hook(socket_getpeername, 0, sock); 2241 } 2242 2243 int security_socket_getsockopt(struct socket *sock, int level, int optname) 2244 { 2245 return call_int_hook(socket_getsockopt, 0, sock, level, optname); 2246 } 2247 2248 int security_socket_setsockopt(struct socket *sock, int level, int optname) 2249 { 2250 return call_int_hook(socket_setsockopt, 0, sock, level, optname); 2251 } 2252 2253 int security_socket_shutdown(struct socket *sock, int how) 2254 { 2255 return call_int_hook(socket_shutdown, 0, sock, how); 2256 } 2257 2258 int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) 2259 { 2260 return call_int_hook(socket_sock_rcv_skb, 0, sk, skb); 2261 } 2262 EXPORT_SYMBOL(security_sock_rcv_skb); 2263 2264 int security_socket_getpeersec_stream(struct socket *sock, char __user *optval, 2265 int __user *optlen, unsigned len) 2266 { 2267 return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock, 2268 optval, optlen, len); 2269 } 2270 2271 int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid) 2272 { 2273 return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock, 2274 skb, secid); 2275 } 2276 EXPORT_SYMBOL(security_socket_getpeersec_dgram); 2277 2278 int security_sk_alloc(struct sock *sk, int family, gfp_t priority) 2279 { 2280 return call_int_hook(sk_alloc_security, 0, sk, family, priority); 2281 } 2282 2283 void security_sk_free(struct sock *sk) 2284 { 2285 call_void_hook(sk_free_security, sk); 2286 } 2287 2288 void security_sk_clone(const struct sock *sk, struct sock *newsk) 2289 { 2290 call_void_hook(sk_clone_security, sk, newsk); 2291 } 2292 EXPORT_SYMBOL(security_sk_clone); 2293 2294 void security_sk_classify_flow(struct sock *sk, struct flowi_common *flic) 2295 { 2296 call_void_hook(sk_getsecid, sk, &flic->flowic_secid); 2297 } 2298 EXPORT_SYMBOL(security_sk_classify_flow); 2299 2300 void security_req_classify_flow(const struct request_sock *req, 2301 struct flowi_common *flic) 2302 { 2303 call_void_hook(req_classify_flow, req, flic); 2304 } 2305 EXPORT_SYMBOL(security_req_classify_flow); 2306 2307 void security_sock_graft(struct sock *sk, struct socket *parent) 2308 { 2309 call_void_hook(sock_graft, sk, parent); 2310 } 2311 EXPORT_SYMBOL(security_sock_graft); 2312 2313 int security_inet_conn_request(const struct sock *sk, 2314 struct sk_buff *skb, struct request_sock *req) 2315 { 2316 return call_int_hook(inet_conn_request, 0, sk, skb, req); 2317 } 2318 EXPORT_SYMBOL(security_inet_conn_request); 2319 2320 void security_inet_csk_clone(struct sock *newsk, 2321 const struct request_sock *req) 2322 { 2323 call_void_hook(inet_csk_clone, newsk, req); 2324 } 2325 2326 void security_inet_conn_established(struct sock *sk, 2327 struct sk_buff *skb) 2328 { 2329 call_void_hook(inet_conn_established, sk, skb); 2330 } 2331 EXPORT_SYMBOL(security_inet_conn_established); 2332 2333 int security_secmark_relabel_packet(u32 secid) 2334 { 2335 return call_int_hook(secmark_relabel_packet, 0, secid); 2336 } 2337 EXPORT_SYMBOL(security_secmark_relabel_packet); 2338 2339 void security_secmark_refcount_inc(void) 2340 { 2341 call_void_hook(secmark_refcount_inc); 2342 } 2343 EXPORT_SYMBOL(security_secmark_refcount_inc); 2344 2345 void security_secmark_refcount_dec(void) 2346 { 2347 call_void_hook(secmark_refcount_dec); 2348 } 2349 EXPORT_SYMBOL(security_secmark_refcount_dec); 2350 2351 int security_tun_dev_alloc_security(void **security) 2352 { 2353 return call_int_hook(tun_dev_alloc_security, 0, security); 2354 } 2355 EXPORT_SYMBOL(security_tun_dev_alloc_security); 2356 2357 void security_tun_dev_free_security(void *security) 2358 { 2359 call_void_hook(tun_dev_free_security, security); 2360 } 2361 EXPORT_SYMBOL(security_tun_dev_free_security); 2362 2363 int security_tun_dev_create(void) 2364 { 2365 return call_int_hook(tun_dev_create, 0); 2366 } 2367 EXPORT_SYMBOL(security_tun_dev_create); 2368 2369 int security_tun_dev_attach_queue(void *security) 2370 { 2371 return call_int_hook(tun_dev_attach_queue, 0, security); 2372 } 2373 EXPORT_SYMBOL(security_tun_dev_attach_queue); 2374 2375 int security_tun_dev_attach(struct sock *sk, void *security) 2376 { 2377 return call_int_hook(tun_dev_attach, 0, sk, security); 2378 } 2379 EXPORT_SYMBOL(security_tun_dev_attach); 2380 2381 int security_tun_dev_open(void *security) 2382 { 2383 return call_int_hook(tun_dev_open, 0, security); 2384 } 2385 EXPORT_SYMBOL(security_tun_dev_open); 2386 2387 int security_sctp_assoc_request(struct sctp_association *asoc, struct sk_buff *skb) 2388 { 2389 return call_int_hook(sctp_assoc_request, 0, asoc, skb); 2390 } 2391 EXPORT_SYMBOL(security_sctp_assoc_request); 2392 2393 int security_sctp_bind_connect(struct sock *sk, int optname, 2394 struct sockaddr *address, int addrlen) 2395 { 2396 return call_int_hook(sctp_bind_connect, 0, sk, optname, 2397 address, addrlen); 2398 } 2399 EXPORT_SYMBOL(security_sctp_bind_connect); 2400 2401 void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk, 2402 struct sock *newsk) 2403 { 2404 call_void_hook(sctp_sk_clone, asoc, sk, newsk); 2405 } 2406 EXPORT_SYMBOL(security_sctp_sk_clone); 2407 2408 int security_sctp_assoc_established(struct sctp_association *asoc, 2409 struct sk_buff *skb) 2410 { 2411 return call_int_hook(sctp_assoc_established, 0, asoc, skb); 2412 } 2413 EXPORT_SYMBOL(security_sctp_assoc_established); 2414 2415 #endif /* CONFIG_SECURITY_NETWORK */ 2416 2417 #ifdef CONFIG_SECURITY_INFINIBAND 2418 2419 int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey) 2420 { 2421 return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey); 2422 } 2423 EXPORT_SYMBOL(security_ib_pkey_access); 2424 2425 int security_ib_endport_manage_subnet(void *sec, const char *dev_name, u8 port_num) 2426 { 2427 return call_int_hook(ib_endport_manage_subnet, 0, sec, dev_name, port_num); 2428 } 2429 EXPORT_SYMBOL(security_ib_endport_manage_subnet); 2430 2431 int security_ib_alloc_security(void **sec) 2432 { 2433 return call_int_hook(ib_alloc_security, 0, sec); 2434 } 2435 EXPORT_SYMBOL(security_ib_alloc_security); 2436 2437 void security_ib_free_security(void *sec) 2438 { 2439 call_void_hook(ib_free_security, sec); 2440 } 2441 EXPORT_SYMBOL(security_ib_free_security); 2442 #endif /* CONFIG_SECURITY_INFINIBAND */ 2443 2444 #ifdef CONFIG_SECURITY_NETWORK_XFRM 2445 2446 int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, 2447 struct xfrm_user_sec_ctx *sec_ctx, 2448 gfp_t gfp) 2449 { 2450 return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp); 2451 } 2452 EXPORT_SYMBOL(security_xfrm_policy_alloc); 2453 2454 int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx, 2455 struct xfrm_sec_ctx **new_ctxp) 2456 { 2457 return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp); 2458 } 2459 2460 void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx) 2461 { 2462 call_void_hook(xfrm_policy_free_security, ctx); 2463 } 2464 EXPORT_SYMBOL(security_xfrm_policy_free); 2465 2466 int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx) 2467 { 2468 return call_int_hook(xfrm_policy_delete_security, 0, ctx); 2469 } 2470 2471 int security_xfrm_state_alloc(struct xfrm_state *x, 2472 struct xfrm_user_sec_ctx *sec_ctx) 2473 { 2474 return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx); 2475 } 2476 EXPORT_SYMBOL(security_xfrm_state_alloc); 2477 2478 int security_xfrm_state_alloc_acquire(struct xfrm_state *x, 2479 struct xfrm_sec_ctx *polsec, u32 secid) 2480 { 2481 return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid); 2482 } 2483 2484 int security_xfrm_state_delete(struct xfrm_state *x) 2485 { 2486 return call_int_hook(xfrm_state_delete_security, 0, x); 2487 } 2488 EXPORT_SYMBOL(security_xfrm_state_delete); 2489 2490 void security_xfrm_state_free(struct xfrm_state *x) 2491 { 2492 call_void_hook(xfrm_state_free_security, x); 2493 } 2494 2495 int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid) 2496 { 2497 return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid); 2498 } 2499 2500 int security_xfrm_state_pol_flow_match(struct xfrm_state *x, 2501 struct xfrm_policy *xp, 2502 const struct flowi_common *flic) 2503 { 2504 struct security_hook_list *hp; 2505 int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match); 2506 2507 /* 2508 * Since this function is expected to return 0 or 1, the judgment 2509 * becomes difficult if multiple LSMs supply this call. Fortunately, 2510 * we can use the first LSM's judgment because currently only SELinux 2511 * supplies this call. 2512 * 2513 * For speed optimization, we explicitly break the loop rather than 2514 * using the macro 2515 */ 2516 hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match, 2517 list) { 2518 rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic); 2519 break; 2520 } 2521 return rc; 2522 } 2523 2524 int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid) 2525 { 2526 return call_int_hook(xfrm_decode_session, 0, skb, secid, 1); 2527 } 2528 2529 void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic) 2530 { 2531 int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid, 2532 0); 2533 2534 BUG_ON(rc); 2535 } 2536 EXPORT_SYMBOL(security_skb_classify_flow); 2537 2538 #endif /* CONFIG_SECURITY_NETWORK_XFRM */ 2539 2540 #ifdef CONFIG_KEYS 2541 2542 int security_key_alloc(struct key *key, const struct cred *cred, 2543 unsigned long flags) 2544 { 2545 return call_int_hook(key_alloc, 0, key, cred, flags); 2546 } 2547 2548 void security_key_free(struct key *key) 2549 { 2550 call_void_hook(key_free, key); 2551 } 2552 2553 int security_key_permission(key_ref_t key_ref, const struct cred *cred, 2554 enum key_need_perm need_perm) 2555 { 2556 return call_int_hook(key_permission, 0, key_ref, cred, need_perm); 2557 } 2558 2559 int security_key_getsecurity(struct key *key, char **_buffer) 2560 { 2561 *_buffer = NULL; 2562 return call_int_hook(key_getsecurity, 0, key, _buffer); 2563 } 2564 2565 #endif /* CONFIG_KEYS */ 2566 2567 #ifdef CONFIG_AUDIT 2568 2569 int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule) 2570 { 2571 return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule); 2572 } 2573 2574 int security_audit_rule_known(struct audit_krule *krule) 2575 { 2576 return call_int_hook(audit_rule_known, 0, krule); 2577 } 2578 2579 void security_audit_rule_free(void *lsmrule) 2580 { 2581 call_void_hook(audit_rule_free, lsmrule); 2582 } 2583 2584 int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule) 2585 { 2586 return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule); 2587 } 2588 #endif /* CONFIG_AUDIT */ 2589 2590 #ifdef CONFIG_BPF_SYSCALL 2591 int security_bpf(int cmd, union bpf_attr *attr, unsigned int size) 2592 { 2593 return call_int_hook(bpf, 0, cmd, attr, size); 2594 } 2595 int security_bpf_map(struct bpf_map *map, fmode_t fmode) 2596 { 2597 return call_int_hook(bpf_map, 0, map, fmode); 2598 } 2599 int security_bpf_prog(struct bpf_prog *prog) 2600 { 2601 return call_int_hook(bpf_prog, 0, prog); 2602 } 2603 int security_bpf_map_alloc(struct bpf_map *map) 2604 { 2605 return call_int_hook(bpf_map_alloc_security, 0, map); 2606 } 2607 int security_bpf_prog_alloc(struct bpf_prog_aux *aux) 2608 { 2609 return call_int_hook(bpf_prog_alloc_security, 0, aux); 2610 } 2611 void security_bpf_map_free(struct bpf_map *map) 2612 { 2613 call_void_hook(bpf_map_free_security, map); 2614 } 2615 void security_bpf_prog_free(struct bpf_prog_aux *aux) 2616 { 2617 call_void_hook(bpf_prog_free_security, aux); 2618 } 2619 #endif /* CONFIG_BPF_SYSCALL */ 2620 2621 int security_locked_down(enum lockdown_reason what) 2622 { 2623 return call_int_hook(locked_down, 0, what); 2624 } 2625 EXPORT_SYMBOL(security_locked_down); 2626 2627 #ifdef CONFIG_PERF_EVENTS 2628 int security_perf_event_open(struct perf_event_attr *attr, int type) 2629 { 2630 return call_int_hook(perf_event_open, 0, attr, type); 2631 } 2632 2633 int security_perf_event_alloc(struct perf_event *event) 2634 { 2635 return call_int_hook(perf_event_alloc, 0, event); 2636 } 2637 2638 void security_perf_event_free(struct perf_event *event) 2639 { 2640 call_void_hook(perf_event_free, event); 2641 } 2642 2643 int security_perf_event_read(struct perf_event *event) 2644 { 2645 return call_int_hook(perf_event_read, 0, event); 2646 } 2647 2648 int security_perf_event_write(struct perf_event *event) 2649 { 2650 return call_int_hook(perf_event_write, 0, event); 2651 } 2652 #endif /* CONFIG_PERF_EVENTS */ 2653 2654 #ifdef CONFIG_IO_URING 2655 int security_uring_override_creds(const struct cred *new) 2656 { 2657 return call_int_hook(uring_override_creds, 0, new); 2658 } 2659 2660 int security_uring_sqpoll(void) 2661 { 2662 return call_int_hook(uring_sqpoll, 0); 2663 } 2664 #endif /* CONFIG_IO_URING */ 2665