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