security/security.c

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