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