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_RTAS_ERROR_INJECTION] = "RTAS error injection", 65 [LOCKDOWN_INTEGRITY_MAX] = "integrity", 66 [LOCKDOWN_KCORE] = "/proc/kcore access", 67 [LOCKDOWN_KPROBES] = "use of kprobes", 68 [LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM", 69 [LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM", 70 [LOCKDOWN_PERF] = "unsafe use of perf", 71 [LOCKDOWN_TRACEFS] = "use of tracefs", 72 [LOCKDOWN_XMON_RW] = "xmon read and write access", 73 [LOCKDOWN_XFRM_SECRET] = "xfrm SA secret", 74 [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality", 75 }; 76 77 struct security_hook_heads security_hook_heads __lsm_ro_after_init; 78 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain); 79 80 static struct kmem_cache *lsm_file_cache; 81 static struct kmem_cache *lsm_inode_cache; 82 83 char *lsm_names; 84 static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init; 85 86 /* Boot-time LSM user choice */ 87 static __initdata const char *chosen_lsm_order; 88 static __initdata const char *chosen_major_lsm; 89 90 static __initconst const char * const builtin_lsm_order = CONFIG_LSM; 91 92 /* Ordered list of LSMs to initialize. */ 93 static __initdata struct lsm_info **ordered_lsms; 94 static __initdata struct lsm_info *exclusive; 95 96 static __initdata bool debug; 97 #define init_debug(...) \ 98 do { \ 99 if (debug) \ 100 pr_info(__VA_ARGS__); \ 101 } while (0) 102 103 static bool __init is_enabled(struct lsm_info *lsm) 104 { 105 if (!lsm->enabled) 106 return false; 107 108 return *lsm->enabled; 109 } 110 111 /* Mark an LSM's enabled flag. */ 112 static int lsm_enabled_true __initdata = 1; 113 static int lsm_enabled_false __initdata = 0; 114 static void __init set_enabled(struct lsm_info *lsm, bool enabled) 115 { 116 /* 117 * When an LSM hasn't configured an enable variable, we can use 118 * a hard-coded location for storing the default enabled state. 119 */ 120 if (!lsm->enabled) { 121 if (enabled) 122 lsm->enabled = &lsm_enabled_true; 123 else 124 lsm->enabled = &lsm_enabled_false; 125 } else if (lsm->enabled == &lsm_enabled_true) { 126 if (!enabled) 127 lsm->enabled = &lsm_enabled_false; 128 } else if (lsm->enabled == &lsm_enabled_false) { 129 if (enabled) 130 lsm->enabled = &lsm_enabled_true; 131 } else { 132 *lsm->enabled = enabled; 133 } 134 } 135 136 /* Is an LSM already listed in the ordered LSMs list? */ 137 static bool __init exists_ordered_lsm(struct lsm_info *lsm) 138 { 139 struct lsm_info **check; 140 141 for (check = ordered_lsms; *check; check++) 142 if (*check == lsm) 143 return true; 144 145 return false; 146 } 147 148 /* Append an LSM to the list of ordered LSMs to initialize. */ 149 static int last_lsm __initdata; 150 static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from) 151 { 152 /* Ignore duplicate selections. */ 153 if (exists_ordered_lsm(lsm)) 154 return; 155 156 if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from)) 157 return; 158 159 /* Enable this LSM, if it is not already set. */ 160 if (!lsm->enabled) 161 lsm->enabled = &lsm_enabled_true; 162 ordered_lsms[last_lsm++] = lsm; 163 164 init_debug("%s ordering: %s (%sabled)\n", from, lsm->name, 165 is_enabled(lsm) ? "en" : "dis"); 166 } 167 168 /* Is an LSM allowed to be initialized? */ 169 static bool __init lsm_allowed(struct lsm_info *lsm) 170 { 171 /* Skip if the LSM is disabled. */ 172 if (!is_enabled(lsm)) 173 return false; 174 175 /* Not allowed if another exclusive LSM already initialized. */ 176 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) { 177 init_debug("exclusive disabled: %s\n", lsm->name); 178 return false; 179 } 180 181 return true; 182 } 183 184 static void __init lsm_set_blob_size(int *need, int *lbs) 185 { 186 int offset; 187 188 if (*need > 0) { 189 offset = *lbs; 190 *lbs += *need; 191 *need = offset; 192 } 193 } 194 195 static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed) 196 { 197 if (!needed) 198 return; 199 200 lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred); 201 lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file); 202 /* 203 * The inode blob gets an rcu_head in addition to 204 * what the modules might need. 205 */ 206 if (needed->lbs_inode && blob_sizes.lbs_inode == 0) 207 blob_sizes.lbs_inode = sizeof(struct rcu_head); 208 lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode); 209 lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc); 210 lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg); 211 lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock); 212 lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task); 213 } 214 215 /* Prepare LSM for initialization. */ 216 static void __init prepare_lsm(struct lsm_info *lsm) 217 { 218 int enabled = lsm_allowed(lsm); 219 220 /* Record enablement (to handle any following exclusive LSMs). */ 221 set_enabled(lsm, enabled); 222 223 /* If enabled, do pre-initialization work. */ 224 if (enabled) { 225 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) { 226 exclusive = lsm; 227 init_debug("exclusive chosen: %s\n", lsm->name); 228 } 229 230 lsm_set_blob_sizes(lsm->blobs); 231 } 232 } 233 234 /* Initialize a given LSM, if it is enabled. */ 235 static void __init initialize_lsm(struct lsm_info *lsm) 236 { 237 if (is_enabled(lsm)) { 238 int ret; 239 240 init_debug("initializing %s\n", lsm->name); 241 ret = lsm->init(); 242 WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret); 243 } 244 } 245 246 /* Populate ordered LSMs list from comma-separated LSM name list. */ 247 static void __init ordered_lsm_parse(const char *order, const char *origin) 248 { 249 struct lsm_info *lsm; 250 char *sep, *name, *next; 251 252 /* LSM_ORDER_FIRST is always first. */ 253 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 254 if (lsm->order == LSM_ORDER_FIRST) 255 append_ordered_lsm(lsm, "first"); 256 } 257 258 /* Process "security=", if given. */ 259 if (chosen_major_lsm) { 260 struct lsm_info *major; 261 262 /* 263 * To match the original "security=" behavior, this 264 * explicitly does NOT fallback to another Legacy Major 265 * if the selected one was separately disabled: disable 266 * all non-matching Legacy Major LSMs. 267 */ 268 for (major = __start_lsm_info; major < __end_lsm_info; 269 major++) { 270 if ((major->flags & LSM_FLAG_LEGACY_MAJOR) && 271 strcmp(major->name, chosen_major_lsm) != 0) { 272 set_enabled(major, false); 273 init_debug("security=%s disabled: %s\n", 274 chosen_major_lsm, major->name); 275 } 276 } 277 } 278 279 sep = kstrdup(order, GFP_KERNEL); 280 next = sep; 281 /* Walk the list, looking for matching LSMs. */ 282 while ((name = strsep(&next, ",")) != NULL) { 283 bool found = false; 284 285 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 286 if (lsm->order == LSM_ORDER_MUTABLE && 287 strcmp(lsm->name, name) == 0) { 288 append_ordered_lsm(lsm, origin); 289 found = true; 290 } 291 } 292 293 if (!found) 294 init_debug("%s ignored: %s\n", origin, name); 295 } 296 297 /* Process "security=", if given. */ 298 if (chosen_major_lsm) { 299 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 300 if (exists_ordered_lsm(lsm)) 301 continue; 302 if (strcmp(lsm->name, chosen_major_lsm) == 0) 303 append_ordered_lsm(lsm, "security="); 304 } 305 } 306 307 /* Disable all LSMs not in the ordered list. */ 308 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { 309 if (exists_ordered_lsm(lsm)) 310 continue; 311 set_enabled(lsm, false); 312 init_debug("%s disabled: %s\n", origin, lsm->name); 313 } 314 315 kfree(sep); 316 } 317 318 static void __init lsm_early_cred(struct cred *cred); 319 static void __init lsm_early_task(struct task_struct *task); 320 321 static int lsm_append(const char *new, char **result); 322 323 static void __init ordered_lsm_init(void) 324 { 325 struct lsm_info **lsm; 326 327 ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms), 328 GFP_KERNEL); 329 330 if (chosen_lsm_order) { 331 if (chosen_major_lsm) { 332 pr_info("security= is ignored because it is superseded by lsm=\n"); 333 chosen_major_lsm = NULL; 334 } 335 ordered_lsm_parse(chosen_lsm_order, "cmdline"); 336 } else 337 ordered_lsm_parse(builtin_lsm_order, "builtin"); 338 339 for (lsm = ordered_lsms; *lsm; lsm++) 340 prepare_lsm(*lsm); 341 342 init_debug("cred blob size = %d\n", blob_sizes.lbs_cred); 343 init_debug("file blob size = %d\n", blob_sizes.lbs_file); 344 init_debug("inode blob size = %d\n", blob_sizes.lbs_inode); 345 init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc); 346 init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg); 347 init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock); 348 init_debug("task blob size = %d\n", blob_sizes.lbs_task); 349 350 /* 351 * Create any kmem_caches needed for blobs 352 */ 353 if (blob_sizes.lbs_file) 354 lsm_file_cache = kmem_cache_create("lsm_file_cache", 355 blob_sizes.lbs_file, 0, 356 SLAB_PANIC, NULL); 357 if (blob_sizes.lbs_inode) 358 lsm_inode_cache = kmem_cache_create("lsm_inode_cache", 359 blob_sizes.lbs_inode, 0, 360 SLAB_PANIC, NULL); 361 362 lsm_early_cred((struct cred *) current->cred); 363 lsm_early_task(current); 364 for (lsm = ordered_lsms; *lsm; lsm++) 365 initialize_lsm(*lsm); 366 367 kfree(ordered_lsms); 368 } 369 370 int __init early_security_init(void) 371 { 372 struct lsm_info *lsm; 373 374 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \ 375 INIT_HLIST_HEAD(&security_hook_heads.NAME); 376 #include "linux/lsm_hook_defs.h" 377 #undef LSM_HOOK 378 379 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) { 380 if (!lsm->enabled) 381 lsm->enabled = &lsm_enabled_true; 382 prepare_lsm(lsm); 383 initialize_lsm(lsm); 384 } 385 386 return 0; 387 } 388 389 /** 390 * security_init - initializes the security framework 391 * 392 * This should be called early in the kernel initialization sequence. 393 */ 394 int __init security_init(void) 395 { 396 struct lsm_info *lsm; 397 398 pr_info("Security Framework initializing\n"); 399 400 /* 401 * Append the names of the early LSM modules now that kmalloc() is 402 * available 403 */ 404 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) { 405 if (lsm->enabled) 406 lsm_append(lsm->name, &lsm_names); 407 } 408 409 /* Load LSMs in specified order. */ 410 ordered_lsm_init(); 411 412 return 0; 413 } 414 415 /* Save user chosen LSM */ 416 static int __init choose_major_lsm(char *str) 417 { 418 chosen_major_lsm = str; 419 return 1; 420 } 421 __setup("security=", choose_major_lsm); 422 423 /* Explicitly choose LSM initialization order. */ 424 static int __init choose_lsm_order(char *str) 425 { 426 chosen_lsm_order = str; 427 return 1; 428 } 429 __setup("lsm=", choose_lsm_order); 430 431 /* Enable LSM order debugging. */ 432 static int __init enable_debug(char *str) 433 { 434 debug = true; 435 return 1; 436 } 437 __setup("lsm.debug", enable_debug); 438 439 static bool match_last_lsm(const char *list, const char *lsm) 440 { 441 const char *last; 442 443 if (WARN_ON(!list || !lsm)) 444 return false; 445 last = strrchr(list, ','); 446 if (last) 447 /* Pass the comma, strcmp() will check for '\0' */ 448 last++; 449 else 450 last = list; 451 return !strcmp(last, lsm); 452 } 453 454 static int lsm_append(const char *new, char **result) 455 { 456 char *cp; 457 458 if (*result == NULL) { 459 *result = kstrdup(new, GFP_KERNEL); 460 if (*result == NULL) 461 return -ENOMEM; 462 } else { 463 /* Check if it is the last registered name */ 464 if (match_last_lsm(*result, new)) 465 return 0; 466 cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new); 467 if (cp == NULL) 468 return -ENOMEM; 469 kfree(*result); 470 *result = cp; 471 } 472 return 0; 473 } 474 475 /** 476 * security_add_hooks - Add a modules hooks to the hook lists. 477 * @hooks: the hooks to add 478 * @count: the number of hooks to add 479 * @lsm: the name of the security module 480 * 481 * Each LSM has to register its hooks with the infrastructure. 482 */ 483 void __init security_add_hooks(struct security_hook_list *hooks, int count, 484 const char *lsm) 485 { 486 int i; 487 488 for (i = 0; i < count; i++) { 489 hooks[i].lsm = lsm; 490 hlist_add_tail_rcu(&hooks[i].list, hooks[i].head); 491 } 492 493 /* 494 * Don't try to append during early_security_init(), we'll come back 495 * and fix this up afterwards. 496 */ 497 if (slab_is_available()) { 498 if (lsm_append(lsm, &lsm_names) < 0) 499 panic("%s - Cannot get early memory.\n", __func__); 500 } 501 } 502 503 int call_blocking_lsm_notifier(enum lsm_event event, void *data) 504 { 505 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain, 506 event, data); 507 } 508 EXPORT_SYMBOL(call_blocking_lsm_notifier); 509 510 int register_blocking_lsm_notifier(struct notifier_block *nb) 511 { 512 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain, 513 nb); 514 } 515 EXPORT_SYMBOL(register_blocking_lsm_notifier); 516 517 int unregister_blocking_lsm_notifier(struct notifier_block *nb) 518 { 519 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain, 520 nb); 521 } 522 EXPORT_SYMBOL(unregister_blocking_lsm_notifier); 523 524 /** 525 * lsm_cred_alloc - allocate a composite cred blob 526 * @cred: the cred that needs a blob 527 * @gfp: allocation type 528 * 529 * Allocate the cred blob for all the modules 530 * 531 * Returns 0, or -ENOMEM if memory can't be allocated. 532 */ 533 static int lsm_cred_alloc(struct cred *cred, gfp_t gfp) 534 { 535 if (blob_sizes.lbs_cred == 0) { 536 cred->security = NULL; 537 return 0; 538 } 539 540 cred->security = kzalloc(blob_sizes.lbs_cred, gfp); 541 if (cred->security == NULL) 542 return -ENOMEM; 543 return 0; 544 } 545 546 /** 547 * lsm_early_cred - during initialization allocate a composite cred blob 548 * @cred: the cred that needs a blob 549 * 550 * Allocate the cred blob for all the modules 551 */ 552 static void __init lsm_early_cred(struct cred *cred) 553 { 554 int rc = lsm_cred_alloc(cred, GFP_KERNEL); 555 556 if (rc) 557 panic("%s: Early cred alloc failed.\n", __func__); 558 } 559 560 /** 561 * lsm_file_alloc - allocate a composite file blob 562 * @file: the file that needs a blob 563 * 564 * Allocate the file blob for all the modules 565 * 566 * Returns 0, or -ENOMEM if memory can't be allocated. 567 */ 568 static int lsm_file_alloc(struct file *file) 569 { 570 if (!lsm_file_cache) { 571 file->f_security = NULL; 572 return 0; 573 } 574 575 file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL); 576 if (file->f_security == NULL) 577 return -ENOMEM; 578 return 0; 579 } 580 581 /** 582 * lsm_inode_alloc - allocate a composite inode blob 583 * @inode: the inode that needs a blob 584 * 585 * Allocate the inode blob for all the modules 586 * 587 * Returns 0, or -ENOMEM if memory can't be allocated. 588 */ 589 int lsm_inode_alloc(struct inode *inode) 590 { 591 if (!lsm_inode_cache) { 592 inode->i_security = NULL; 593 return 0; 594 } 595 596 inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS); 597 if (inode->i_security == NULL) 598 return -ENOMEM; 599 return 0; 600 } 601 602 /** 603 * lsm_task_alloc - allocate a composite task blob 604 * @task: the task that needs a blob 605 * 606 * Allocate the task blob for all the modules 607 * 608 * Returns 0, or -ENOMEM if memory can't be allocated. 609 */ 610 static int lsm_task_alloc(struct task_struct *task) 611 { 612 if (blob_sizes.lbs_task == 0) { 613 task->security = NULL; 614 return 0; 615 } 616 617 task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL); 618 if (task->security == NULL) 619 return -ENOMEM; 620 return 0; 621 } 622 623 /** 624 * lsm_ipc_alloc - allocate a composite ipc blob 625 * @kip: the ipc that needs a blob 626 * 627 * Allocate the ipc blob for all the modules 628 * 629 * Returns 0, or -ENOMEM if memory can't be allocated. 630 */ 631 static int lsm_ipc_alloc(struct kern_ipc_perm *kip) 632 { 633 if (blob_sizes.lbs_ipc == 0) { 634 kip->security = NULL; 635 return 0; 636 } 637 638 kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL); 639 if (kip->security == NULL) 640 return -ENOMEM; 641 return 0; 642 } 643 644 /** 645 * lsm_msg_msg_alloc - allocate a composite msg_msg blob 646 * @mp: the msg_msg that needs a blob 647 * 648 * Allocate the ipc blob for all the modules 649 * 650 * Returns 0, or -ENOMEM if memory can't be allocated. 651 */ 652 static int lsm_msg_msg_alloc(struct msg_msg *mp) 653 { 654 if (blob_sizes.lbs_msg_msg == 0) { 655 mp->security = NULL; 656 return 0; 657 } 658 659 mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL); 660 if (mp->security == NULL) 661 return -ENOMEM; 662 return 0; 663 } 664 665 /** 666 * lsm_early_task - during initialization allocate a composite task blob 667 * @task: the task that needs a blob 668 * 669 * Allocate the task blob for all the modules 670 */ 671 static void __init lsm_early_task(struct task_struct *task) 672 { 673 int rc = lsm_task_alloc(task); 674 675 if (rc) 676 panic("%s: Early task alloc failed.\n", __func__); 677 } 678 679 /** 680 * lsm_superblock_alloc - allocate a composite superblock blob 681 * @sb: the superblock that needs a blob 682 * 683 * Allocate the superblock blob for all the modules 684 * 685 * Returns 0, or -ENOMEM if memory can't be allocated. 686 */ 687 static int lsm_superblock_alloc(struct super_block *sb) 688 { 689 if (blob_sizes.lbs_superblock == 0) { 690 sb->s_security = NULL; 691 return 0; 692 } 693 694 sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL); 695 if (sb->s_security == NULL) 696 return -ENOMEM; 697 return 0; 698 } 699 700 /* 701 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and 702 * can be accessed with: 703 * 704 * LSM_RET_DEFAULT(<hook_name>) 705 * 706 * The macros below define static constants for the default value of each 707 * LSM hook. 708 */ 709 #define LSM_RET_DEFAULT(NAME) (NAME##_default) 710 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME) 711 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \ 712 static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT); 713 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \ 714 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME) 715 716 #include <linux/lsm_hook_defs.h> 717 #undef LSM_HOOK 718 719 /* 720 * Hook list operation macros. 721 * 722 * call_void_hook: 723 * This is a hook that does not return a value. 724 * 725 * call_int_hook: 726 * This is a hook that returns a value. 727 */ 728 729 #define call_void_hook(FUNC, ...) \ 730 do { \ 731 struct security_hook_list *P; \ 732 \ 733 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \ 734 P->hook.FUNC(__VA_ARGS__); \ 735 } while (0) 736 737 #define call_int_hook(FUNC, IRC, ...) ({ \ 738 int RC = IRC; \ 739 do { \ 740 struct security_hook_list *P; \ 741 \ 742 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \ 743 RC = P->hook.FUNC(__VA_ARGS__); \ 744 if (RC != 0) \ 745 break; \ 746 } \ 747 } while (0); \ 748 RC; \ 749 }) 750 751 /* Security operations */ 752 753 int security_binder_set_context_mgr(const struct cred *mgr) 754 { 755 return call_int_hook(binder_set_context_mgr, 0, mgr); 756 } 757 758 int security_binder_transaction(const struct cred *from, 759 const struct cred *to) 760 { 761 return call_int_hook(binder_transaction, 0, from, to); 762 } 763 764 int security_binder_transfer_binder(const struct cred *from, 765 const struct cred *to) 766 { 767 return call_int_hook(binder_transfer_binder, 0, from, to); 768 } 769 770 int security_binder_transfer_file(const struct cred *from, 771 const struct cred *to, struct file *file) 772 { 773 return call_int_hook(binder_transfer_file, 0, from, to, file); 774 } 775 776 int security_ptrace_access_check(struct task_struct *child, unsigned int mode) 777 { 778 return call_int_hook(ptrace_access_check, 0, child, mode); 779 } 780 781 int security_ptrace_traceme(struct task_struct *parent) 782 { 783 return call_int_hook(ptrace_traceme, 0, parent); 784 } 785 786 int security_capget(struct task_struct *target, 787 kernel_cap_t *effective, 788 kernel_cap_t *inheritable, 789 kernel_cap_t *permitted) 790 { 791 return call_int_hook(capget, 0, target, 792 effective, inheritable, permitted); 793 } 794 795 int security_capset(struct cred *new, const struct cred *old, 796 const kernel_cap_t *effective, 797 const kernel_cap_t *inheritable, 798 const kernel_cap_t *permitted) 799 { 800 return call_int_hook(capset, 0, new, old, 801 effective, inheritable, permitted); 802 } 803 804 int security_capable(const struct cred *cred, 805 struct user_namespace *ns, 806 int cap, 807 unsigned int opts) 808 { 809 return call_int_hook(capable, 0, cred, ns, cap, opts); 810 } 811 812 int security_quotactl(int cmds, int type, int id, struct super_block *sb) 813 { 814 return call_int_hook(quotactl, 0, cmds, type, id, sb); 815 } 816 817 int security_quota_on(struct dentry *dentry) 818 { 819 return call_int_hook(quota_on, 0, dentry); 820 } 821 822 int security_syslog(int type) 823 { 824 return call_int_hook(syslog, 0, type); 825 } 826 827 int security_settime64(const struct timespec64 *ts, const struct timezone *tz) 828 { 829 return call_int_hook(settime, 0, ts, tz); 830 } 831 832 int security_vm_enough_memory_mm(struct mm_struct *mm, long pages) 833 { 834 struct security_hook_list *hp; 835 int cap_sys_admin = 1; 836 int rc; 837 838 /* 839 * The module will respond with a positive value if 840 * it thinks the __vm_enough_memory() call should be 841 * made with the cap_sys_admin set. If all of the modules 842 * agree that it should be set it will. If any module 843 * thinks it should not be set it won't. 844 */ 845 hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) { 846 rc = hp->hook.vm_enough_memory(mm, pages); 847 if (rc <= 0) { 848 cap_sys_admin = 0; 849 break; 850 } 851 } 852 return __vm_enough_memory(mm, pages, cap_sys_admin); 853 } 854 855 int security_bprm_creds_for_exec(struct linux_binprm *bprm) 856 { 857 return call_int_hook(bprm_creds_for_exec, 0, bprm); 858 } 859 860 int security_bprm_creds_from_file(struct linux_binprm *bprm, struct file *file) 861 { 862 return call_int_hook(bprm_creds_from_file, 0, bprm, file); 863 } 864 865 int security_bprm_check(struct linux_binprm *bprm) 866 { 867 int ret; 868 869 ret = call_int_hook(bprm_check_security, 0, bprm); 870 if (ret) 871 return ret; 872 return ima_bprm_check(bprm); 873 } 874 875 void security_bprm_committing_creds(struct linux_binprm *bprm) 876 { 877 call_void_hook(bprm_committing_creds, bprm); 878 } 879 880 void security_bprm_committed_creds(struct linux_binprm *bprm) 881 { 882 call_void_hook(bprm_committed_creds, bprm); 883 } 884 885 int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc) 886 { 887 return call_int_hook(fs_context_dup, 0, fc, src_fc); 888 } 889 890 int security_fs_context_parse_param(struct fs_context *fc, 891 struct fs_parameter *param) 892 { 893 struct security_hook_list *hp; 894 int trc; 895 int rc = -ENOPARAM; 896 897 hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param, 898 list) { 899 trc = hp->hook.fs_context_parse_param(fc, param); 900 if (trc == 0) 901 rc = 0; 902 else if (trc != -ENOPARAM) 903 return trc; 904 } 905 return rc; 906 } 907 908 int security_sb_alloc(struct super_block *sb) 909 { 910 int rc = lsm_superblock_alloc(sb); 911 912 if (unlikely(rc)) 913 return rc; 914 rc = call_int_hook(sb_alloc_security, 0, sb); 915 if (unlikely(rc)) 916 security_sb_free(sb); 917 return rc; 918 } 919 920 void security_sb_delete(struct super_block *sb) 921 { 922 call_void_hook(sb_delete, sb); 923 } 924 925 void security_sb_free(struct super_block *sb) 926 { 927 call_void_hook(sb_free_security, sb); 928 kfree(sb->s_security); 929 sb->s_security = NULL; 930 } 931 932 void security_free_mnt_opts(void **mnt_opts) 933 { 934 if (!*mnt_opts) 935 return; 936 call_void_hook(sb_free_mnt_opts, *mnt_opts); 937 *mnt_opts = NULL; 938 } 939 EXPORT_SYMBOL(security_free_mnt_opts); 940 941 int security_sb_eat_lsm_opts(char *options, void **mnt_opts) 942 { 943 return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts); 944 } 945 EXPORT_SYMBOL(security_sb_eat_lsm_opts); 946 947 int security_sb_mnt_opts_compat(struct super_block *sb, 948 void *mnt_opts) 949 { 950 return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts); 951 } 952 EXPORT_SYMBOL(security_sb_mnt_opts_compat); 953 954 int security_sb_remount(struct super_block *sb, 955 void *mnt_opts) 956 { 957 return call_int_hook(sb_remount, 0, sb, mnt_opts); 958 } 959 EXPORT_SYMBOL(security_sb_remount); 960 961 int security_sb_kern_mount(struct super_block *sb) 962 { 963 return call_int_hook(sb_kern_mount, 0, sb); 964 } 965 966 int security_sb_show_options(struct seq_file *m, struct super_block *sb) 967 { 968 return call_int_hook(sb_show_options, 0, m, sb); 969 } 970 971 int security_sb_statfs(struct dentry *dentry) 972 { 973 return call_int_hook(sb_statfs, 0, dentry); 974 } 975 976 int security_sb_mount(const char *dev_name, const struct path *path, 977 const char *type, unsigned long flags, void *data) 978 { 979 return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data); 980 } 981 982 int security_sb_umount(struct vfsmount *mnt, int flags) 983 { 984 return call_int_hook(sb_umount, 0, mnt, flags); 985 } 986 987 int security_sb_pivotroot(const struct path *old_path, const struct path *new_path) 988 { 989 return call_int_hook(sb_pivotroot, 0, old_path, new_path); 990 } 991 992 int security_sb_set_mnt_opts(struct super_block *sb, 993 void *mnt_opts, 994 unsigned long kern_flags, 995 unsigned long *set_kern_flags) 996 { 997 return call_int_hook(sb_set_mnt_opts, 998 mnt_opts ? -EOPNOTSUPP : 0, sb, 999 mnt_opts, kern_flags, set_kern_flags); 1000 } 1001 EXPORT_SYMBOL(security_sb_set_mnt_opts); 1002 1003 int security_sb_clone_mnt_opts(const struct super_block *oldsb, 1004 struct super_block *newsb, 1005 unsigned long kern_flags, 1006 unsigned long *set_kern_flags) 1007 { 1008 return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb, 1009 kern_flags, set_kern_flags); 1010 } 1011 EXPORT_SYMBOL(security_sb_clone_mnt_opts); 1012 1013 int security_move_mount(const struct path *from_path, const struct path *to_path) 1014 { 1015 return call_int_hook(move_mount, 0, from_path, to_path); 1016 } 1017 1018 int security_path_notify(const struct path *path, u64 mask, 1019 unsigned int obj_type) 1020 { 1021 return call_int_hook(path_notify, 0, path, mask, obj_type); 1022 } 1023 1024 int security_inode_alloc(struct inode *inode) 1025 { 1026 int rc = lsm_inode_alloc(inode); 1027 1028 if (unlikely(rc)) 1029 return rc; 1030 rc = call_int_hook(inode_alloc_security, 0, inode); 1031 if (unlikely(rc)) 1032 security_inode_free(inode); 1033 return rc; 1034 } 1035 1036 static void inode_free_by_rcu(struct rcu_head *head) 1037 { 1038 /* 1039 * The rcu head is at the start of the inode blob 1040 */ 1041 kmem_cache_free(lsm_inode_cache, head); 1042 } 1043 1044 void security_inode_free(struct inode *inode) 1045 { 1046 integrity_inode_free(inode); 1047 call_void_hook(inode_free_security, inode); 1048 /* 1049 * The inode may still be referenced in a path walk and 1050 * a call to security_inode_permission() can be made 1051 * after inode_free_security() is called. Ideally, the VFS 1052 * wouldn't do this, but fixing that is a much harder 1053 * job. For now, simply free the i_security via RCU, and 1054 * leave the current inode->i_security pointer intact. 1055 * The inode will be freed after the RCU grace period too. 1056 */ 1057 if (inode->i_security) 1058 call_rcu((struct rcu_head *)inode->i_security, 1059 inode_free_by_rcu); 1060 } 1061 1062 int security_dentry_init_security(struct dentry *dentry, int mode, 1063 const struct qstr *name, 1064 const char **xattr_name, void **ctx, 1065 u32 *ctxlen) 1066 { 1067 struct security_hook_list *hp; 1068 int rc; 1069 1070 /* 1071 * Only one module will provide a security context. 1072 */ 1073 hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security, list) { 1074 rc = hp->hook.dentry_init_security(dentry, mode, name, 1075 xattr_name, ctx, ctxlen); 1076 if (rc != LSM_RET_DEFAULT(dentry_init_security)) 1077 return rc; 1078 } 1079 return LSM_RET_DEFAULT(dentry_init_security); 1080 } 1081 EXPORT_SYMBOL(security_dentry_init_security); 1082 1083 int security_dentry_create_files_as(struct dentry *dentry, int mode, 1084 struct qstr *name, 1085 const struct cred *old, struct cred *new) 1086 { 1087 return call_int_hook(dentry_create_files_as, 0, dentry, mode, 1088 name, old, new); 1089 } 1090 EXPORT_SYMBOL(security_dentry_create_files_as); 1091 1092 int security_inode_init_security(struct inode *inode, struct inode *dir, 1093 const struct qstr *qstr, 1094 const initxattrs initxattrs, void *fs_data) 1095 { 1096 struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1]; 1097 struct xattr *lsm_xattr, *evm_xattr, *xattr; 1098 int ret; 1099 1100 if (unlikely(IS_PRIVATE(inode))) 1101 return 0; 1102 1103 if (!initxattrs) 1104 return call_int_hook(inode_init_security, -EOPNOTSUPP, inode, 1105 dir, qstr, NULL, NULL, NULL); 1106 memset(new_xattrs, 0, sizeof(new_xattrs)); 1107 lsm_xattr = new_xattrs; 1108 ret = call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir, qstr, 1109 &lsm_xattr->name, 1110 &lsm_xattr->value, 1111 &lsm_xattr->value_len); 1112 if (ret) 1113 goto out; 1114 1115 evm_xattr = lsm_xattr + 1; 1116 ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr); 1117 if (ret) 1118 goto out; 1119 ret = initxattrs(inode, new_xattrs, fs_data); 1120 out: 1121 for (xattr = new_xattrs; xattr->value != NULL; xattr++) 1122 kfree(xattr->value); 1123 return (ret == -EOPNOTSUPP) ? 0 : ret; 1124 } 1125 EXPORT_SYMBOL(security_inode_init_security); 1126 1127 int security_inode_init_security_anon(struct inode *inode, 1128 const struct qstr *name, 1129 const struct inode *context_inode) 1130 { 1131 return call_int_hook(inode_init_security_anon, 0, inode, name, 1132 context_inode); 1133 } 1134 1135 int security_old_inode_init_security(struct inode *inode, struct inode *dir, 1136 const struct qstr *qstr, const char **name, 1137 void **value, size_t *len) 1138 { 1139 if (unlikely(IS_PRIVATE(inode))) 1140 return -EOPNOTSUPP; 1141 return call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir, 1142 qstr, name, value, len); 1143 } 1144 EXPORT_SYMBOL(security_old_inode_init_security); 1145 1146 #ifdef CONFIG_SECURITY_PATH 1147 int security_path_mknod(const struct path *dir, struct dentry *dentry, umode_t mode, 1148 unsigned int dev) 1149 { 1150 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1151 return 0; 1152 return call_int_hook(path_mknod, 0, dir, dentry, mode, dev); 1153 } 1154 EXPORT_SYMBOL(security_path_mknod); 1155 1156 int security_path_mkdir(const struct path *dir, struct dentry *dentry, umode_t mode) 1157 { 1158 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1159 return 0; 1160 return call_int_hook(path_mkdir, 0, dir, dentry, mode); 1161 } 1162 EXPORT_SYMBOL(security_path_mkdir); 1163 1164 int security_path_rmdir(const struct path *dir, struct dentry *dentry) 1165 { 1166 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1167 return 0; 1168 return call_int_hook(path_rmdir, 0, dir, dentry); 1169 } 1170 1171 int security_path_unlink(const struct path *dir, struct dentry *dentry) 1172 { 1173 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1174 return 0; 1175 return call_int_hook(path_unlink, 0, dir, dentry); 1176 } 1177 EXPORT_SYMBOL(security_path_unlink); 1178 1179 int security_path_symlink(const struct path *dir, struct dentry *dentry, 1180 const char *old_name) 1181 { 1182 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) 1183 return 0; 1184 return call_int_hook(path_symlink, 0, dir, dentry, old_name); 1185 } 1186 1187 int security_path_link(struct dentry *old_dentry, const struct path *new_dir, 1188 struct dentry *new_dentry) 1189 { 1190 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)))) 1191 return 0; 1192 return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry); 1193 } 1194 1195 int security_path_rename(const struct path *old_dir, struct dentry *old_dentry, 1196 const struct path *new_dir, struct dentry *new_dentry, 1197 unsigned int flags) 1198 { 1199 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) || 1200 (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry))))) 1201 return 0; 1202 1203 return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir, 1204 new_dentry, flags); 1205 } 1206 EXPORT_SYMBOL(security_path_rename); 1207 1208 int security_path_truncate(const struct path *path) 1209 { 1210 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1211 return 0; 1212 return call_int_hook(path_truncate, 0, path); 1213 } 1214 1215 int security_path_chmod(const struct path *path, umode_t mode) 1216 { 1217 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1218 return 0; 1219 return call_int_hook(path_chmod, 0, path, mode); 1220 } 1221 1222 int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) 1223 { 1224 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1225 return 0; 1226 return call_int_hook(path_chown, 0, path, uid, gid); 1227 } 1228 1229 int security_path_chroot(const struct path *path) 1230 { 1231 return call_int_hook(path_chroot, 0, path); 1232 } 1233 #endif 1234 1235 int security_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode) 1236 { 1237 if (unlikely(IS_PRIVATE(dir))) 1238 return 0; 1239 return call_int_hook(inode_create, 0, dir, dentry, mode); 1240 } 1241 EXPORT_SYMBOL_GPL(security_inode_create); 1242 1243 int security_inode_link(struct dentry *old_dentry, struct inode *dir, 1244 struct dentry *new_dentry) 1245 { 1246 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)))) 1247 return 0; 1248 return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry); 1249 } 1250 1251 int security_inode_unlink(struct inode *dir, struct dentry *dentry) 1252 { 1253 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1254 return 0; 1255 return call_int_hook(inode_unlink, 0, dir, dentry); 1256 } 1257 1258 int security_inode_symlink(struct inode *dir, struct dentry *dentry, 1259 const char *old_name) 1260 { 1261 if (unlikely(IS_PRIVATE(dir))) 1262 return 0; 1263 return call_int_hook(inode_symlink, 0, dir, dentry, old_name); 1264 } 1265 1266 int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1267 { 1268 if (unlikely(IS_PRIVATE(dir))) 1269 return 0; 1270 return call_int_hook(inode_mkdir, 0, dir, dentry, mode); 1271 } 1272 EXPORT_SYMBOL_GPL(security_inode_mkdir); 1273 1274 int security_inode_rmdir(struct inode *dir, struct dentry *dentry) 1275 { 1276 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1277 return 0; 1278 return call_int_hook(inode_rmdir, 0, dir, dentry); 1279 } 1280 1281 int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 1282 { 1283 if (unlikely(IS_PRIVATE(dir))) 1284 return 0; 1285 return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev); 1286 } 1287 1288 int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry, 1289 struct inode *new_dir, struct dentry *new_dentry, 1290 unsigned int flags) 1291 { 1292 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) || 1293 (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry))))) 1294 return 0; 1295 1296 if (flags & RENAME_EXCHANGE) { 1297 int err = call_int_hook(inode_rename, 0, new_dir, new_dentry, 1298 old_dir, old_dentry); 1299 if (err) 1300 return err; 1301 } 1302 1303 return call_int_hook(inode_rename, 0, old_dir, old_dentry, 1304 new_dir, new_dentry); 1305 } 1306 1307 int security_inode_readlink(struct dentry *dentry) 1308 { 1309 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1310 return 0; 1311 return call_int_hook(inode_readlink, 0, dentry); 1312 } 1313 1314 int security_inode_follow_link(struct dentry *dentry, struct inode *inode, 1315 bool rcu) 1316 { 1317 if (unlikely(IS_PRIVATE(inode))) 1318 return 0; 1319 return call_int_hook(inode_follow_link, 0, dentry, inode, rcu); 1320 } 1321 1322 int security_inode_permission(struct inode *inode, int mask) 1323 { 1324 if (unlikely(IS_PRIVATE(inode))) 1325 return 0; 1326 return call_int_hook(inode_permission, 0, inode, mask); 1327 } 1328 1329 int security_inode_setattr(struct user_namespace *mnt_userns, 1330 struct dentry *dentry, struct iattr *attr) 1331 { 1332 int ret; 1333 1334 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1335 return 0; 1336 ret = call_int_hook(inode_setattr, 0, dentry, attr); 1337 if (ret) 1338 return ret; 1339 return evm_inode_setattr(mnt_userns, dentry, attr); 1340 } 1341 EXPORT_SYMBOL_GPL(security_inode_setattr); 1342 1343 int security_inode_getattr(const struct path *path) 1344 { 1345 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) 1346 return 0; 1347 return call_int_hook(inode_getattr, 0, path); 1348 } 1349 1350 int security_inode_setxattr(struct user_namespace *mnt_userns, 1351 struct dentry *dentry, const char *name, 1352 const void *value, size_t size, int flags) 1353 { 1354 int ret; 1355 1356 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1357 return 0; 1358 /* 1359 * SELinux and Smack integrate the cap call, 1360 * so assume that all LSMs supplying this call do so. 1361 */ 1362 ret = call_int_hook(inode_setxattr, 1, mnt_userns, dentry, name, value, 1363 size, flags); 1364 1365 if (ret == 1) 1366 ret = cap_inode_setxattr(dentry, name, value, size, flags); 1367 if (ret) 1368 return ret; 1369 ret = ima_inode_setxattr(dentry, name, value, size); 1370 if (ret) 1371 return ret; 1372 return evm_inode_setxattr(mnt_userns, dentry, name, value, size); 1373 } 1374 1375 int security_inode_set_acl(struct user_namespace *mnt_userns, 1376 struct dentry *dentry, const char *acl_name, 1377 struct posix_acl *kacl) 1378 { 1379 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1380 return 0; 1381 return call_int_hook(inode_set_acl, 0, mnt_userns, dentry, acl_name, kacl); 1382 } 1383 1384 int security_inode_get_acl(struct user_namespace *mnt_userns, 1385 struct dentry *dentry, const char *acl_name) 1386 { 1387 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1388 return 0; 1389 return call_int_hook(inode_get_acl, 0, mnt_userns, dentry, acl_name); 1390 } 1391 1392 int security_inode_remove_acl(struct user_namespace *mnt_userns, 1393 struct dentry *dentry, const char *acl_name) 1394 { 1395 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1396 return 0; 1397 return call_int_hook(inode_remove_acl, 0, mnt_userns, dentry, acl_name); 1398 } 1399 1400 void security_inode_post_setxattr(struct dentry *dentry, const char *name, 1401 const void *value, size_t size, int flags) 1402 { 1403 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1404 return; 1405 call_void_hook(inode_post_setxattr, dentry, name, value, size, flags); 1406 evm_inode_post_setxattr(dentry, name, value, size); 1407 } 1408 1409 int security_inode_getxattr(struct dentry *dentry, const char *name) 1410 { 1411 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1412 return 0; 1413 return call_int_hook(inode_getxattr, 0, dentry, name); 1414 } 1415 1416 int security_inode_listxattr(struct dentry *dentry) 1417 { 1418 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1419 return 0; 1420 return call_int_hook(inode_listxattr, 0, dentry); 1421 } 1422 1423 int security_inode_removexattr(struct user_namespace *mnt_userns, 1424 struct dentry *dentry, const char *name) 1425 { 1426 int ret; 1427 1428 if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) 1429 return 0; 1430 /* 1431 * SELinux and Smack integrate the cap call, 1432 * so assume that all LSMs supplying this call do so. 1433 */ 1434 ret = call_int_hook(inode_removexattr, 1, mnt_userns, dentry, name); 1435 if (ret == 1) 1436 ret = cap_inode_removexattr(mnt_userns, dentry, name); 1437 if (ret) 1438 return ret; 1439 ret = ima_inode_removexattr(dentry, name); 1440 if (ret) 1441 return ret; 1442 return evm_inode_removexattr(mnt_userns, dentry, name); 1443 } 1444 1445 int security_inode_need_killpriv(struct dentry *dentry) 1446 { 1447 return call_int_hook(inode_need_killpriv, 0, dentry); 1448 } 1449 1450 int security_inode_killpriv(struct user_namespace *mnt_userns, 1451 struct dentry *dentry) 1452 { 1453 return call_int_hook(inode_killpriv, 0, mnt_userns, dentry); 1454 } 1455 1456 int security_inode_getsecurity(struct user_namespace *mnt_userns, 1457 struct inode *inode, const char *name, 1458 void **buffer, bool alloc) 1459 { 1460 struct security_hook_list *hp; 1461 int rc; 1462 1463 if (unlikely(IS_PRIVATE(inode))) 1464 return LSM_RET_DEFAULT(inode_getsecurity); 1465 /* 1466 * Only one module will provide an attribute with a given name. 1467 */ 1468 hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) { 1469 rc = hp->hook.inode_getsecurity(mnt_userns, inode, name, buffer, alloc); 1470 if (rc != LSM_RET_DEFAULT(inode_getsecurity)) 1471 return rc; 1472 } 1473 return LSM_RET_DEFAULT(inode_getsecurity); 1474 } 1475 1476 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags) 1477 { 1478 struct security_hook_list *hp; 1479 int rc; 1480 1481 if (unlikely(IS_PRIVATE(inode))) 1482 return LSM_RET_DEFAULT(inode_setsecurity); 1483 /* 1484 * Only one module will provide an attribute with a given name. 1485 */ 1486 hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) { 1487 rc = hp->hook.inode_setsecurity(inode, name, value, size, 1488 flags); 1489 if (rc != LSM_RET_DEFAULT(inode_setsecurity)) 1490 return rc; 1491 } 1492 return LSM_RET_DEFAULT(inode_setsecurity); 1493 } 1494 1495 int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) 1496 { 1497 if (unlikely(IS_PRIVATE(inode))) 1498 return 0; 1499 return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size); 1500 } 1501 EXPORT_SYMBOL(security_inode_listsecurity); 1502 1503 void security_inode_getsecid(struct inode *inode, u32 *secid) 1504 { 1505 call_void_hook(inode_getsecid, inode, secid); 1506 } 1507 1508 int security_inode_copy_up(struct dentry *src, struct cred **new) 1509 { 1510 return call_int_hook(inode_copy_up, 0, src, new); 1511 } 1512 EXPORT_SYMBOL(security_inode_copy_up); 1513 1514 int security_inode_copy_up_xattr(const char *name) 1515 { 1516 struct security_hook_list *hp; 1517 int rc; 1518 1519 /* 1520 * The implementation can return 0 (accept the xattr), 1 (discard the 1521 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or 1522 * any other error code incase of an error. 1523 */ 1524 hlist_for_each_entry(hp, 1525 &security_hook_heads.inode_copy_up_xattr, list) { 1526 rc = hp->hook.inode_copy_up_xattr(name); 1527 if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr)) 1528 return rc; 1529 } 1530 1531 return LSM_RET_DEFAULT(inode_copy_up_xattr); 1532 } 1533 EXPORT_SYMBOL(security_inode_copy_up_xattr); 1534 1535 int security_kernfs_init_security(struct kernfs_node *kn_dir, 1536 struct kernfs_node *kn) 1537 { 1538 return call_int_hook(kernfs_init_security, 0, kn_dir, kn); 1539 } 1540 1541 int security_file_permission(struct file *file, int mask) 1542 { 1543 int ret; 1544 1545 ret = call_int_hook(file_permission, 0, file, mask); 1546 if (ret) 1547 return ret; 1548 1549 return fsnotify_perm(file, mask); 1550 } 1551 1552 int security_file_alloc(struct file *file) 1553 { 1554 int rc = lsm_file_alloc(file); 1555 1556 if (rc) 1557 return rc; 1558 rc = call_int_hook(file_alloc_security, 0, file); 1559 if (unlikely(rc)) 1560 security_file_free(file); 1561 return rc; 1562 } 1563 1564 void security_file_free(struct file *file) 1565 { 1566 void *blob; 1567 1568 call_void_hook(file_free_security, file); 1569 1570 blob = file->f_security; 1571 if (blob) { 1572 file->f_security = NULL; 1573 kmem_cache_free(lsm_file_cache, blob); 1574 } 1575 } 1576 1577 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1578 { 1579 return call_int_hook(file_ioctl, 0, file, cmd, arg); 1580 } 1581 EXPORT_SYMBOL_GPL(security_file_ioctl); 1582 1583 static inline unsigned long mmap_prot(struct file *file, unsigned long prot) 1584 { 1585 /* 1586 * Does we have PROT_READ and does the application expect 1587 * it to imply PROT_EXEC? If not, nothing to talk about... 1588 */ 1589 if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ) 1590 return prot; 1591 if (!(current->personality & READ_IMPLIES_EXEC)) 1592 return prot; 1593 /* 1594 * if that's an anonymous mapping, let it. 1595 */ 1596 if (!file) 1597 return prot | PROT_EXEC; 1598 /* 1599 * ditto if it's not on noexec mount, except that on !MMU we need 1600 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case 1601 */ 1602 if (!path_noexec(&file->f_path)) { 1603 #ifndef CONFIG_MMU 1604 if (file->f_op->mmap_capabilities) { 1605 unsigned caps = file->f_op->mmap_capabilities(file); 1606 if (!(caps & NOMMU_MAP_EXEC)) 1607 return prot; 1608 } 1609 #endif 1610 return prot | PROT_EXEC; 1611 } 1612 /* anything on noexec mount won't get PROT_EXEC */ 1613 return prot; 1614 } 1615 1616 int security_mmap_file(struct file *file, unsigned long prot, 1617 unsigned long flags) 1618 { 1619 int ret; 1620 ret = call_int_hook(mmap_file, 0, file, prot, 1621 mmap_prot(file, prot), flags); 1622 if (ret) 1623 return ret; 1624 return ima_file_mmap(file, prot); 1625 } 1626 1627 int security_mmap_addr(unsigned long addr) 1628 { 1629 return call_int_hook(mmap_addr, 0, addr); 1630 } 1631 1632 int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, 1633 unsigned long prot) 1634 { 1635 int ret; 1636 1637 ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot); 1638 if (ret) 1639 return ret; 1640 return ima_file_mprotect(vma, prot); 1641 } 1642 1643 int security_file_lock(struct file *file, unsigned int cmd) 1644 { 1645 return call_int_hook(file_lock, 0, file, cmd); 1646 } 1647 1648 int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg) 1649 { 1650 return call_int_hook(file_fcntl, 0, file, cmd, arg); 1651 } 1652 1653 void security_file_set_fowner(struct file *file) 1654 { 1655 call_void_hook(file_set_fowner, file); 1656 } 1657 1658 int security_file_send_sigiotask(struct task_struct *tsk, 1659 struct fown_struct *fown, int sig) 1660 { 1661 return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig); 1662 } 1663 1664 int security_file_receive(struct file *file) 1665 { 1666 return call_int_hook(file_receive, 0, file); 1667 } 1668 1669 int security_file_open(struct file *file) 1670 { 1671 int ret; 1672 1673 ret = call_int_hook(file_open, 0, file); 1674 if (ret) 1675 return ret; 1676 1677 return fsnotify_perm(file, MAY_OPEN); 1678 } 1679 1680 int security_task_alloc(struct task_struct *task, unsigned long clone_flags) 1681 { 1682 int rc = lsm_task_alloc(task); 1683 1684 if (rc) 1685 return rc; 1686 rc = call_int_hook(task_alloc, 0, task, clone_flags); 1687 if (unlikely(rc)) 1688 security_task_free(task); 1689 return rc; 1690 } 1691 1692 void security_task_free(struct task_struct *task) 1693 { 1694 call_void_hook(task_free, task); 1695 1696 kfree(task->security); 1697 task->security = NULL; 1698 } 1699 1700 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp) 1701 { 1702 int rc = lsm_cred_alloc(cred, gfp); 1703 1704 if (rc) 1705 return rc; 1706 1707 rc = call_int_hook(cred_alloc_blank, 0, cred, gfp); 1708 if (unlikely(rc)) 1709 security_cred_free(cred); 1710 return rc; 1711 } 1712 1713 void security_cred_free(struct cred *cred) 1714 { 1715 /* 1716 * There is a failure case in prepare_creds() that 1717 * may result in a call here with ->security being NULL. 1718 */ 1719 if (unlikely(cred->security == NULL)) 1720 return; 1721 1722 call_void_hook(cred_free, cred); 1723 1724 kfree(cred->security); 1725 cred->security = NULL; 1726 } 1727 1728 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp) 1729 { 1730 int rc = lsm_cred_alloc(new, gfp); 1731 1732 if (rc) 1733 return rc; 1734 1735 rc = call_int_hook(cred_prepare, 0, new, old, gfp); 1736 if (unlikely(rc)) 1737 security_cred_free(new); 1738 return rc; 1739 } 1740 1741 void security_transfer_creds(struct cred *new, const struct cred *old) 1742 { 1743 call_void_hook(cred_transfer, new, old); 1744 } 1745 1746 void security_cred_getsecid(const struct cred *c, u32 *secid) 1747 { 1748 *secid = 0; 1749 call_void_hook(cred_getsecid, c, secid); 1750 } 1751 EXPORT_SYMBOL(security_cred_getsecid); 1752 1753 int security_kernel_act_as(struct cred *new, u32 secid) 1754 { 1755 return call_int_hook(kernel_act_as, 0, new, secid); 1756 } 1757 1758 int security_kernel_create_files_as(struct cred *new, struct inode *inode) 1759 { 1760 return call_int_hook(kernel_create_files_as, 0, new, inode); 1761 } 1762 1763 int security_kernel_module_request(char *kmod_name) 1764 { 1765 int ret; 1766 1767 ret = call_int_hook(kernel_module_request, 0, kmod_name); 1768 if (ret) 1769 return ret; 1770 return integrity_kernel_module_request(kmod_name); 1771 } 1772 1773 int security_kernel_read_file(struct file *file, enum kernel_read_file_id id, 1774 bool contents) 1775 { 1776 int ret; 1777 1778 ret = call_int_hook(kernel_read_file, 0, file, id, contents); 1779 if (ret) 1780 return ret; 1781 return ima_read_file(file, id, contents); 1782 } 1783 EXPORT_SYMBOL_GPL(security_kernel_read_file); 1784 1785 int security_kernel_post_read_file(struct file *file, char *buf, loff_t size, 1786 enum kernel_read_file_id id) 1787 { 1788 int ret; 1789 1790 ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id); 1791 if (ret) 1792 return ret; 1793 return ima_post_read_file(file, buf, size, id); 1794 } 1795 EXPORT_SYMBOL_GPL(security_kernel_post_read_file); 1796 1797 int security_kernel_load_data(enum kernel_load_data_id id, bool contents) 1798 { 1799 int ret; 1800 1801 ret = call_int_hook(kernel_load_data, 0, id, contents); 1802 if (ret) 1803 return ret; 1804 return ima_load_data(id, contents); 1805 } 1806 EXPORT_SYMBOL_GPL(security_kernel_load_data); 1807 1808 int security_kernel_post_load_data(char *buf, loff_t size, 1809 enum kernel_load_data_id id, 1810 char *description) 1811 { 1812 int ret; 1813 1814 ret = call_int_hook(kernel_post_load_data, 0, buf, size, id, 1815 description); 1816 if (ret) 1817 return ret; 1818 return ima_post_load_data(buf, size, id, description); 1819 } 1820 EXPORT_SYMBOL_GPL(security_kernel_post_load_data); 1821 1822 int security_task_fix_setuid(struct cred *new, const struct cred *old, 1823 int flags) 1824 { 1825 return call_int_hook(task_fix_setuid, 0, new, old, flags); 1826 } 1827 1828 int security_task_fix_setgid(struct cred *new, const struct cred *old, 1829 int flags) 1830 { 1831 return call_int_hook(task_fix_setgid, 0, new, old, flags); 1832 } 1833 1834 int security_task_fix_setgroups(struct cred *new, const struct cred *old) 1835 { 1836 return call_int_hook(task_fix_setgroups, 0, new, old); 1837 } 1838 1839 int security_task_setpgid(struct task_struct *p, pid_t pgid) 1840 { 1841 return call_int_hook(task_setpgid, 0, p, pgid); 1842 } 1843 1844 int security_task_getpgid(struct task_struct *p) 1845 { 1846 return call_int_hook(task_getpgid, 0, p); 1847 } 1848 1849 int security_task_getsid(struct task_struct *p) 1850 { 1851 return call_int_hook(task_getsid, 0, p); 1852 } 1853 1854 void security_current_getsecid_subj(u32 *secid) 1855 { 1856 *secid = 0; 1857 call_void_hook(current_getsecid_subj, secid); 1858 } 1859 EXPORT_SYMBOL(security_current_getsecid_subj); 1860 1861 void security_task_getsecid_obj(struct task_struct *p, u32 *secid) 1862 { 1863 *secid = 0; 1864 call_void_hook(task_getsecid_obj, p, secid); 1865 } 1866 EXPORT_SYMBOL(security_task_getsecid_obj); 1867 1868 int security_task_setnice(struct task_struct *p, int nice) 1869 { 1870 return call_int_hook(task_setnice, 0, p, nice); 1871 } 1872 1873 int security_task_setioprio(struct task_struct *p, int ioprio) 1874 { 1875 return call_int_hook(task_setioprio, 0, p, ioprio); 1876 } 1877 1878 int security_task_getioprio(struct task_struct *p) 1879 { 1880 return call_int_hook(task_getioprio, 0, p); 1881 } 1882 1883 int security_task_prlimit(const struct cred *cred, const struct cred *tcred, 1884 unsigned int flags) 1885 { 1886 return call_int_hook(task_prlimit, 0, cred, tcred, flags); 1887 } 1888 1889 int security_task_setrlimit(struct task_struct *p, unsigned int resource, 1890 struct rlimit *new_rlim) 1891 { 1892 return call_int_hook(task_setrlimit, 0, p, resource, new_rlim); 1893 } 1894 1895 int security_task_setscheduler(struct task_struct *p) 1896 { 1897 return call_int_hook(task_setscheduler, 0, p); 1898 } 1899 1900 int security_task_getscheduler(struct task_struct *p) 1901 { 1902 return call_int_hook(task_getscheduler, 0, p); 1903 } 1904 1905 int security_task_movememory(struct task_struct *p) 1906 { 1907 return call_int_hook(task_movememory, 0, p); 1908 } 1909 1910 int security_task_kill(struct task_struct *p, struct kernel_siginfo *info, 1911 int sig, const struct cred *cred) 1912 { 1913 return call_int_hook(task_kill, 0, p, info, sig, cred); 1914 } 1915 1916 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3, 1917 unsigned long arg4, unsigned long arg5) 1918 { 1919 int thisrc; 1920 int rc = LSM_RET_DEFAULT(task_prctl); 1921 struct security_hook_list *hp; 1922 1923 hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) { 1924 thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5); 1925 if (thisrc != LSM_RET_DEFAULT(task_prctl)) { 1926 rc = thisrc; 1927 if (thisrc != 0) 1928 break; 1929 } 1930 } 1931 return rc; 1932 } 1933 1934 void security_task_to_inode(struct task_struct *p, struct inode *inode) 1935 { 1936 call_void_hook(task_to_inode, p, inode); 1937 } 1938 1939 int security_create_user_ns(const struct cred *cred) 1940 { 1941 return call_int_hook(userns_create, 0, cred); 1942 } 1943 1944 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag) 1945 { 1946 return call_int_hook(ipc_permission, 0, ipcp, flag); 1947 } 1948 1949 void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) 1950 { 1951 *secid = 0; 1952 call_void_hook(ipc_getsecid, ipcp, secid); 1953 } 1954 1955 int security_msg_msg_alloc(struct msg_msg *msg) 1956 { 1957 int rc = lsm_msg_msg_alloc(msg); 1958 1959 if (unlikely(rc)) 1960 return rc; 1961 rc = call_int_hook(msg_msg_alloc_security, 0, msg); 1962 if (unlikely(rc)) 1963 security_msg_msg_free(msg); 1964 return rc; 1965 } 1966 1967 void security_msg_msg_free(struct msg_msg *msg) 1968 { 1969 call_void_hook(msg_msg_free_security, msg); 1970 kfree(msg->security); 1971 msg->security = NULL; 1972 } 1973 1974 int security_msg_queue_alloc(struct kern_ipc_perm *msq) 1975 { 1976 int rc = lsm_ipc_alloc(msq); 1977 1978 if (unlikely(rc)) 1979 return rc; 1980 rc = call_int_hook(msg_queue_alloc_security, 0, msq); 1981 if (unlikely(rc)) 1982 security_msg_queue_free(msq); 1983 return rc; 1984 } 1985 1986 void security_msg_queue_free(struct kern_ipc_perm *msq) 1987 { 1988 call_void_hook(msg_queue_free_security, msq); 1989 kfree(msq->security); 1990 msq->security = NULL; 1991 } 1992 1993 int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) 1994 { 1995 return call_int_hook(msg_queue_associate, 0, msq, msqflg); 1996 } 1997 1998 int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd) 1999 { 2000 return call_int_hook(msg_queue_msgctl, 0, msq, cmd); 2001 } 2002 2003 int security_msg_queue_msgsnd(struct kern_ipc_perm *msq, 2004 struct msg_msg *msg, int msqflg) 2005 { 2006 return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg); 2007 } 2008 2009 int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, 2010 struct task_struct *target, long type, int mode) 2011 { 2012 return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode); 2013 } 2014 2015 int security_shm_alloc(struct kern_ipc_perm *shp) 2016 { 2017 int rc = lsm_ipc_alloc(shp); 2018 2019 if (unlikely(rc)) 2020 return rc; 2021 rc = call_int_hook(shm_alloc_security, 0, shp); 2022 if (unlikely(rc)) 2023 security_shm_free(shp); 2024 return rc; 2025 } 2026 2027 void security_shm_free(struct kern_ipc_perm *shp) 2028 { 2029 call_void_hook(shm_free_security, shp); 2030 kfree(shp->security); 2031 shp->security = NULL; 2032 } 2033 2034 int security_shm_associate(struct kern_ipc_perm *shp, int shmflg) 2035 { 2036 return call_int_hook(shm_associate, 0, shp, shmflg); 2037 } 2038 2039 int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd) 2040 { 2041 return call_int_hook(shm_shmctl, 0, shp, cmd); 2042 } 2043 2044 int security_shm_shmat(struct kern_ipc_perm *shp, char __user *shmaddr, int shmflg) 2045 { 2046 return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg); 2047 } 2048 2049 int security_sem_alloc(struct kern_ipc_perm *sma) 2050 { 2051 int rc = lsm_ipc_alloc(sma); 2052 2053 if (unlikely(rc)) 2054 return rc; 2055 rc = call_int_hook(sem_alloc_security, 0, sma); 2056 if (unlikely(rc)) 2057 security_sem_free(sma); 2058 return rc; 2059 } 2060 2061 void security_sem_free(struct kern_ipc_perm *sma) 2062 { 2063 call_void_hook(sem_free_security, sma); 2064 kfree(sma->security); 2065 sma->security = NULL; 2066 } 2067 2068 int security_sem_associate(struct kern_ipc_perm *sma, int semflg) 2069 { 2070 return call_int_hook(sem_associate, 0, sma, semflg); 2071 } 2072 2073 int security_sem_semctl(struct kern_ipc_perm *sma, int cmd) 2074 { 2075 return call_int_hook(sem_semctl, 0, sma, cmd); 2076 } 2077 2078 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops, 2079 unsigned nsops, int alter) 2080 { 2081 return call_int_hook(sem_semop, 0, sma, sops, nsops, alter); 2082 } 2083 2084 void security_d_instantiate(struct dentry *dentry, struct inode *inode) 2085 { 2086 if (unlikely(inode && IS_PRIVATE(inode))) 2087 return; 2088 call_void_hook(d_instantiate, dentry, inode); 2089 } 2090 EXPORT_SYMBOL(security_d_instantiate); 2091 2092 int security_getprocattr(struct task_struct *p, const char *lsm, 2093 const char *name, char **value) 2094 { 2095 struct security_hook_list *hp; 2096 2097 hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) { 2098 if (lsm != NULL && strcmp(lsm, hp->lsm)) 2099 continue; 2100 return hp->hook.getprocattr(p, name, value); 2101 } 2102 return LSM_RET_DEFAULT(getprocattr); 2103 } 2104 2105 int security_setprocattr(const char *lsm, const char *name, void *value, 2106 size_t size) 2107 { 2108 struct security_hook_list *hp; 2109 2110 hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) { 2111 if (lsm != NULL && strcmp(lsm, hp->lsm)) 2112 continue; 2113 return hp->hook.setprocattr(name, value, size); 2114 } 2115 return LSM_RET_DEFAULT(setprocattr); 2116 } 2117 2118 int security_netlink_send(struct sock *sk, struct sk_buff *skb) 2119 { 2120 return call_int_hook(netlink_send, 0, sk, skb); 2121 } 2122 2123 int security_ismaclabel(const char *name) 2124 { 2125 return call_int_hook(ismaclabel, 0, name); 2126 } 2127 EXPORT_SYMBOL(security_ismaclabel); 2128 2129 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) 2130 { 2131 struct security_hook_list *hp; 2132 int rc; 2133 2134 /* 2135 * Currently, only one LSM can implement secid_to_secctx (i.e this 2136 * LSM hook is not "stackable"). 2137 */ 2138 hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) { 2139 rc = hp->hook.secid_to_secctx(secid, secdata, seclen); 2140 if (rc != LSM_RET_DEFAULT(secid_to_secctx)) 2141 return rc; 2142 } 2143 2144 return LSM_RET_DEFAULT(secid_to_secctx); 2145 } 2146 EXPORT_SYMBOL(security_secid_to_secctx); 2147 2148 int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) 2149 { 2150 *secid = 0; 2151 return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid); 2152 } 2153 EXPORT_SYMBOL(security_secctx_to_secid); 2154 2155 void security_release_secctx(char *secdata, u32 seclen) 2156 { 2157 call_void_hook(release_secctx, secdata, seclen); 2158 } 2159 EXPORT_SYMBOL(security_release_secctx); 2160 2161 void security_inode_invalidate_secctx(struct inode *inode) 2162 { 2163 call_void_hook(inode_invalidate_secctx, inode); 2164 } 2165 EXPORT_SYMBOL(security_inode_invalidate_secctx); 2166 2167 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) 2168 { 2169 return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen); 2170 } 2171 EXPORT_SYMBOL(security_inode_notifysecctx); 2172 2173 int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) 2174 { 2175 return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen); 2176 } 2177 EXPORT_SYMBOL(security_inode_setsecctx); 2178 2179 int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) 2180 { 2181 return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen); 2182 } 2183 EXPORT_SYMBOL(security_inode_getsecctx); 2184 2185 #ifdef CONFIG_WATCH_QUEUE 2186 int security_post_notification(const struct cred *w_cred, 2187 const struct cred *cred, 2188 struct watch_notification *n) 2189 { 2190 return call_int_hook(post_notification, 0, w_cred, cred, n); 2191 } 2192 #endif /* CONFIG_WATCH_QUEUE */ 2193 2194 #ifdef CONFIG_KEY_NOTIFICATIONS 2195 int security_watch_key(struct key *key) 2196 { 2197 return call_int_hook(watch_key, 0, key); 2198 } 2199 #endif 2200 2201 #ifdef CONFIG_SECURITY_NETWORK 2202 2203 int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk) 2204 { 2205 return call_int_hook(unix_stream_connect, 0, sock, other, newsk); 2206 } 2207 EXPORT_SYMBOL(security_unix_stream_connect); 2208 2209 int security_unix_may_send(struct socket *sock, struct socket *other) 2210 { 2211 return call_int_hook(unix_may_send, 0, sock, other); 2212 } 2213 EXPORT_SYMBOL(security_unix_may_send); 2214 2215 int security_socket_create(int family, int type, int protocol, int kern) 2216 { 2217 return call_int_hook(socket_create, 0, family, type, protocol, kern); 2218 } 2219 2220 int security_socket_post_create(struct socket *sock, int family, 2221 int type, int protocol, int kern) 2222 { 2223 return call_int_hook(socket_post_create, 0, sock, family, type, 2224 protocol, kern); 2225 } 2226 2227 int security_socket_socketpair(struct socket *socka, struct socket *sockb) 2228 { 2229 return call_int_hook(socket_socketpair, 0, socka, sockb); 2230 } 2231 EXPORT_SYMBOL(security_socket_socketpair); 2232 2233 int security_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) 2234 { 2235 return call_int_hook(socket_bind, 0, sock, address, addrlen); 2236 } 2237 2238 int security_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) 2239 { 2240 return call_int_hook(socket_connect, 0, sock, address, addrlen); 2241 } 2242 2243 int security_socket_listen(struct socket *sock, int backlog) 2244 { 2245 return call_int_hook(socket_listen, 0, sock, backlog); 2246 } 2247 2248 int security_socket_accept(struct socket *sock, struct socket *newsock) 2249 { 2250 return call_int_hook(socket_accept, 0, sock, newsock); 2251 } 2252 2253 int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size) 2254 { 2255 return call_int_hook(socket_sendmsg, 0, sock, msg, size); 2256 } 2257 2258 int security_socket_recvmsg(struct socket *sock, struct msghdr *msg, 2259 int size, int flags) 2260 { 2261 return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags); 2262 } 2263 2264 int security_socket_getsockname(struct socket *sock) 2265 { 2266 return call_int_hook(socket_getsockname, 0, sock); 2267 } 2268 2269 int security_socket_getpeername(struct socket *sock) 2270 { 2271 return call_int_hook(socket_getpeername, 0, sock); 2272 } 2273 2274 int security_socket_getsockopt(struct socket *sock, int level, int optname) 2275 { 2276 return call_int_hook(socket_getsockopt, 0, sock, level, optname); 2277 } 2278 2279 int security_socket_setsockopt(struct socket *sock, int level, int optname) 2280 { 2281 return call_int_hook(socket_setsockopt, 0, sock, level, optname); 2282 } 2283 2284 int security_socket_shutdown(struct socket *sock, int how) 2285 { 2286 return call_int_hook(socket_shutdown, 0, sock, how); 2287 } 2288 2289 int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) 2290 { 2291 return call_int_hook(socket_sock_rcv_skb, 0, sk, skb); 2292 } 2293 EXPORT_SYMBOL(security_sock_rcv_skb); 2294 2295 int security_socket_getpeersec_stream(struct socket *sock, char __user *optval, 2296 int __user *optlen, unsigned len) 2297 { 2298 return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock, 2299 optval, optlen, len); 2300 } 2301 2302 int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid) 2303 { 2304 return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock, 2305 skb, secid); 2306 } 2307 EXPORT_SYMBOL(security_socket_getpeersec_dgram); 2308 2309 int security_sk_alloc(struct sock *sk, int family, gfp_t priority) 2310 { 2311 return call_int_hook(sk_alloc_security, 0, sk, family, priority); 2312 } 2313 2314 void security_sk_free(struct sock *sk) 2315 { 2316 call_void_hook(sk_free_security, sk); 2317 } 2318 2319 void security_sk_clone(const struct sock *sk, struct sock *newsk) 2320 { 2321 call_void_hook(sk_clone_security, sk, newsk); 2322 } 2323 EXPORT_SYMBOL(security_sk_clone); 2324 2325 void security_sk_classify_flow(struct sock *sk, struct flowi_common *flic) 2326 { 2327 call_void_hook(sk_getsecid, sk, &flic->flowic_secid); 2328 } 2329 EXPORT_SYMBOL(security_sk_classify_flow); 2330 2331 void security_req_classify_flow(const struct request_sock *req, 2332 struct flowi_common *flic) 2333 { 2334 call_void_hook(req_classify_flow, req, flic); 2335 } 2336 EXPORT_SYMBOL(security_req_classify_flow); 2337 2338 void security_sock_graft(struct sock *sk, struct socket *parent) 2339 { 2340 call_void_hook(sock_graft, sk, parent); 2341 } 2342 EXPORT_SYMBOL(security_sock_graft); 2343 2344 int security_inet_conn_request(const struct sock *sk, 2345 struct sk_buff *skb, struct request_sock *req) 2346 { 2347 return call_int_hook(inet_conn_request, 0, sk, skb, req); 2348 } 2349 EXPORT_SYMBOL(security_inet_conn_request); 2350 2351 void security_inet_csk_clone(struct sock *newsk, 2352 const struct request_sock *req) 2353 { 2354 call_void_hook(inet_csk_clone, newsk, req); 2355 } 2356 2357 void security_inet_conn_established(struct sock *sk, 2358 struct sk_buff *skb) 2359 { 2360 call_void_hook(inet_conn_established, sk, skb); 2361 } 2362 EXPORT_SYMBOL(security_inet_conn_established); 2363 2364 int security_secmark_relabel_packet(u32 secid) 2365 { 2366 return call_int_hook(secmark_relabel_packet, 0, secid); 2367 } 2368 EXPORT_SYMBOL(security_secmark_relabel_packet); 2369 2370 void security_secmark_refcount_inc(void) 2371 { 2372 call_void_hook(secmark_refcount_inc); 2373 } 2374 EXPORT_SYMBOL(security_secmark_refcount_inc); 2375 2376 void security_secmark_refcount_dec(void) 2377 { 2378 call_void_hook(secmark_refcount_dec); 2379 } 2380 EXPORT_SYMBOL(security_secmark_refcount_dec); 2381 2382 int security_tun_dev_alloc_security(void **security) 2383 { 2384 return call_int_hook(tun_dev_alloc_security, 0, security); 2385 } 2386 EXPORT_SYMBOL(security_tun_dev_alloc_security); 2387 2388 void security_tun_dev_free_security(void *security) 2389 { 2390 call_void_hook(tun_dev_free_security, security); 2391 } 2392 EXPORT_SYMBOL(security_tun_dev_free_security); 2393 2394 int security_tun_dev_create(void) 2395 { 2396 return call_int_hook(tun_dev_create, 0); 2397 } 2398 EXPORT_SYMBOL(security_tun_dev_create); 2399 2400 int security_tun_dev_attach_queue(void *security) 2401 { 2402 return call_int_hook(tun_dev_attach_queue, 0, security); 2403 } 2404 EXPORT_SYMBOL(security_tun_dev_attach_queue); 2405 2406 int security_tun_dev_attach(struct sock *sk, void *security) 2407 { 2408 return call_int_hook(tun_dev_attach, 0, sk, security); 2409 } 2410 EXPORT_SYMBOL(security_tun_dev_attach); 2411 2412 int security_tun_dev_open(void *security) 2413 { 2414 return call_int_hook(tun_dev_open, 0, security); 2415 } 2416 EXPORT_SYMBOL(security_tun_dev_open); 2417 2418 int security_sctp_assoc_request(struct sctp_association *asoc, struct sk_buff *skb) 2419 { 2420 return call_int_hook(sctp_assoc_request, 0, asoc, skb); 2421 } 2422 EXPORT_SYMBOL(security_sctp_assoc_request); 2423 2424 int security_sctp_bind_connect(struct sock *sk, int optname, 2425 struct sockaddr *address, int addrlen) 2426 { 2427 return call_int_hook(sctp_bind_connect, 0, sk, optname, 2428 address, addrlen); 2429 } 2430 EXPORT_SYMBOL(security_sctp_bind_connect); 2431 2432 void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk, 2433 struct sock *newsk) 2434 { 2435 call_void_hook(sctp_sk_clone, asoc, sk, newsk); 2436 } 2437 EXPORT_SYMBOL(security_sctp_sk_clone); 2438 2439 int security_sctp_assoc_established(struct sctp_association *asoc, 2440 struct sk_buff *skb) 2441 { 2442 return call_int_hook(sctp_assoc_established, 0, asoc, skb); 2443 } 2444 EXPORT_SYMBOL(security_sctp_assoc_established); 2445 2446 #endif /* CONFIG_SECURITY_NETWORK */ 2447 2448 #ifdef CONFIG_SECURITY_INFINIBAND 2449 2450 int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey) 2451 { 2452 return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey); 2453 } 2454 EXPORT_SYMBOL(security_ib_pkey_access); 2455 2456 int security_ib_endport_manage_subnet(void *sec, const char *dev_name, u8 port_num) 2457 { 2458 return call_int_hook(ib_endport_manage_subnet, 0, sec, dev_name, port_num); 2459 } 2460 EXPORT_SYMBOL(security_ib_endport_manage_subnet); 2461 2462 int security_ib_alloc_security(void **sec) 2463 { 2464 return call_int_hook(ib_alloc_security, 0, sec); 2465 } 2466 EXPORT_SYMBOL(security_ib_alloc_security); 2467 2468 void security_ib_free_security(void *sec) 2469 { 2470 call_void_hook(ib_free_security, sec); 2471 } 2472 EXPORT_SYMBOL(security_ib_free_security); 2473 #endif /* CONFIG_SECURITY_INFINIBAND */ 2474 2475 #ifdef CONFIG_SECURITY_NETWORK_XFRM 2476 2477 int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, 2478 struct xfrm_user_sec_ctx *sec_ctx, 2479 gfp_t gfp) 2480 { 2481 return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp); 2482 } 2483 EXPORT_SYMBOL(security_xfrm_policy_alloc); 2484 2485 int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx, 2486 struct xfrm_sec_ctx **new_ctxp) 2487 { 2488 return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp); 2489 } 2490 2491 void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx) 2492 { 2493 call_void_hook(xfrm_policy_free_security, ctx); 2494 } 2495 EXPORT_SYMBOL(security_xfrm_policy_free); 2496 2497 int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx) 2498 { 2499 return call_int_hook(xfrm_policy_delete_security, 0, ctx); 2500 } 2501 2502 int security_xfrm_state_alloc(struct xfrm_state *x, 2503 struct xfrm_user_sec_ctx *sec_ctx) 2504 { 2505 return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx); 2506 } 2507 EXPORT_SYMBOL(security_xfrm_state_alloc); 2508 2509 int security_xfrm_state_alloc_acquire(struct xfrm_state *x, 2510 struct xfrm_sec_ctx *polsec, u32 secid) 2511 { 2512 return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid); 2513 } 2514 2515 int security_xfrm_state_delete(struct xfrm_state *x) 2516 { 2517 return call_int_hook(xfrm_state_delete_security, 0, x); 2518 } 2519 EXPORT_SYMBOL(security_xfrm_state_delete); 2520 2521 void security_xfrm_state_free(struct xfrm_state *x) 2522 { 2523 call_void_hook(xfrm_state_free_security, x); 2524 } 2525 2526 int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid) 2527 { 2528 return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid); 2529 } 2530 2531 int security_xfrm_state_pol_flow_match(struct xfrm_state *x, 2532 struct xfrm_policy *xp, 2533 const struct flowi_common *flic) 2534 { 2535 struct security_hook_list *hp; 2536 int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match); 2537 2538 /* 2539 * Since this function is expected to return 0 or 1, the judgment 2540 * becomes difficult if multiple LSMs supply this call. Fortunately, 2541 * we can use the first LSM's judgment because currently only SELinux 2542 * supplies this call. 2543 * 2544 * For speed optimization, we explicitly break the loop rather than 2545 * using the macro 2546 */ 2547 hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match, 2548 list) { 2549 rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic); 2550 break; 2551 } 2552 return rc; 2553 } 2554 2555 int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid) 2556 { 2557 return call_int_hook(xfrm_decode_session, 0, skb, secid, 1); 2558 } 2559 2560 void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic) 2561 { 2562 int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid, 2563 0); 2564 2565 BUG_ON(rc); 2566 } 2567 EXPORT_SYMBOL(security_skb_classify_flow); 2568 2569 #endif /* CONFIG_SECURITY_NETWORK_XFRM */ 2570 2571 #ifdef CONFIG_KEYS 2572 2573 int security_key_alloc(struct key *key, const struct cred *cred, 2574 unsigned long flags) 2575 { 2576 return call_int_hook(key_alloc, 0, key, cred, flags); 2577 } 2578 2579 void security_key_free(struct key *key) 2580 { 2581 call_void_hook(key_free, key); 2582 } 2583 2584 int security_key_permission(key_ref_t key_ref, const struct cred *cred, 2585 enum key_need_perm need_perm) 2586 { 2587 return call_int_hook(key_permission, 0, key_ref, cred, need_perm); 2588 } 2589 2590 int security_key_getsecurity(struct key *key, char **_buffer) 2591 { 2592 *_buffer = NULL; 2593 return call_int_hook(key_getsecurity, 0, key, _buffer); 2594 } 2595 2596 #endif /* CONFIG_KEYS */ 2597 2598 #ifdef CONFIG_AUDIT 2599 2600 int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule) 2601 { 2602 return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule); 2603 } 2604 2605 int security_audit_rule_known(struct audit_krule *krule) 2606 { 2607 return call_int_hook(audit_rule_known, 0, krule); 2608 } 2609 2610 void security_audit_rule_free(void *lsmrule) 2611 { 2612 call_void_hook(audit_rule_free, lsmrule); 2613 } 2614 2615 int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule) 2616 { 2617 return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule); 2618 } 2619 #endif /* CONFIG_AUDIT */ 2620 2621 #ifdef CONFIG_BPF_SYSCALL 2622 int security_bpf(int cmd, union bpf_attr *attr, unsigned int size) 2623 { 2624 return call_int_hook(bpf, 0, cmd, attr, size); 2625 } 2626 int security_bpf_map(struct bpf_map *map, fmode_t fmode) 2627 { 2628 return call_int_hook(bpf_map, 0, map, fmode); 2629 } 2630 int security_bpf_prog(struct bpf_prog *prog) 2631 { 2632 return call_int_hook(bpf_prog, 0, prog); 2633 } 2634 int security_bpf_map_alloc(struct bpf_map *map) 2635 { 2636 return call_int_hook(bpf_map_alloc_security, 0, map); 2637 } 2638 int security_bpf_prog_alloc(struct bpf_prog_aux *aux) 2639 { 2640 return call_int_hook(bpf_prog_alloc_security, 0, aux); 2641 } 2642 void security_bpf_map_free(struct bpf_map *map) 2643 { 2644 call_void_hook(bpf_map_free_security, map); 2645 } 2646 void security_bpf_prog_free(struct bpf_prog_aux *aux) 2647 { 2648 call_void_hook(bpf_prog_free_security, aux); 2649 } 2650 #endif /* CONFIG_BPF_SYSCALL */ 2651 2652 int security_locked_down(enum lockdown_reason what) 2653 { 2654 return call_int_hook(locked_down, 0, what); 2655 } 2656 EXPORT_SYMBOL(security_locked_down); 2657 2658 #ifdef CONFIG_PERF_EVENTS 2659 int security_perf_event_open(struct perf_event_attr *attr, int type) 2660 { 2661 return call_int_hook(perf_event_open, 0, attr, type); 2662 } 2663 2664 int security_perf_event_alloc(struct perf_event *event) 2665 { 2666 return call_int_hook(perf_event_alloc, 0, event); 2667 } 2668 2669 void security_perf_event_free(struct perf_event *event) 2670 { 2671 call_void_hook(perf_event_free, event); 2672 } 2673 2674 int security_perf_event_read(struct perf_event *event) 2675 { 2676 return call_int_hook(perf_event_read, 0, event); 2677 } 2678 2679 int security_perf_event_write(struct perf_event *event) 2680 { 2681 return call_int_hook(perf_event_write, 0, event); 2682 } 2683 #endif /* CONFIG_PERF_EVENTS */ 2684 2685 #ifdef CONFIG_IO_URING 2686 int security_uring_override_creds(const struct cred *new) 2687 { 2688 return call_int_hook(uring_override_creds, 0, new); 2689 } 2690 2691 int security_uring_sqpoll(void) 2692 { 2693 return call_int_hook(uring_sqpoll, 0); 2694 } 2695 int security_uring_cmd(struct io_uring_cmd *ioucmd) 2696 { 2697 return call_int_hook(uring_cmd, 0, ioucmd); 2698 } 2699 #endif /* CONFIG_IO_URING */ 2700