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