1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Security plug functions
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 * Copyright (C) 2023 Microsoft Corporation <paul@paul-moore.com>
12 #define pr_fmt(fmt) "LSM: " fmt
14 #include <linux/bpf.h>
15 #include <linux/capability.h>
16 #include <linux/dcache.h>
17 #include <linux/export.h>
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/kernel_read_file.h>
21 #include <linux/lsm_hooks.h>
22 #include <linux/integrity.h>
23 #include <linux/ima.h>
24 #include <linux/evm.h>
25 #include <linux/fsnotify.h>
26 #include <linux/mman.h>
27 #include <linux/mount.h>
28 #include <linux/personality.h>
29 #include <linux/backing-dev.h>
30 #include <linux/string.h>
31 #include <linux/msg.h>
34 /* How many LSMs were built into the kernel? */
35 #define LSM_COUNT (__end_lsm_info - __start_lsm_info)
38 * How many LSMs are built into the kernel as determined at
39 * build time. Used to determine fixed array sizes.
40 * The capability module is accounted for by CONFIG_SECURITY
42 #define LSM_CONFIG_COUNT ( \
43 (IS_ENABLED(CONFIG_SECURITY) ? 1 : 0) + \
44 (IS_ENABLED(CONFIG_SECURITY_SELINUX) ? 1 : 0) + \
45 (IS_ENABLED(CONFIG_SECURITY_SMACK) ? 1 : 0) + \
46 (IS_ENABLED(CONFIG_SECURITY_TOMOYO) ? 1 : 0) + \
47 (IS_ENABLED(CONFIG_SECURITY_APPARMOR) ? 1 : 0) + \
48 (IS_ENABLED(CONFIG_SECURITY_YAMA) ? 1 : 0) + \
49 (IS_ENABLED(CONFIG_SECURITY_LOADPIN) ? 1 : 0) + \
50 (IS_ENABLED(CONFIG_SECURITY_SAFESETID) ? 1 : 0) + \
51 (IS_ENABLED(CONFIG_SECURITY_LOCKDOWN_LSM) ? 1 : 0) + \
52 (IS_ENABLED(CONFIG_BPF_LSM) ? 1 : 0) + \
53 (IS_ENABLED(CONFIG_SECURITY_LANDLOCK) ? 1 : 0))
56 * These are descriptions of the reasons that can be passed to the
57 * security_locked_down() LSM hook. Placing this array here allows
58 * all security modules to use the same descriptions for auditing
61 const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX + 1] = {
62 [LOCKDOWN_NONE] = "none",
63 [LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading",
64 [LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port",
65 [LOCKDOWN_EFI_TEST] = "/dev/efi_test access",
66 [LOCKDOWN_KEXEC] = "kexec of unsigned images",
67 [LOCKDOWN_HIBERNATION] = "hibernation",
68 [LOCKDOWN_PCI_ACCESS] = "direct PCI access",
69 [LOCKDOWN_IOPORT] = "raw io port access",
70 [LOCKDOWN_MSR] = "raw MSR access",
71 [LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables",
72 [LOCKDOWN_DEVICE_TREE] = "modifying device tree contents",
73 [LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage",
74 [LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO",
75 [LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters",
76 [LOCKDOWN_MMIOTRACE] = "unsafe mmio",
77 [LOCKDOWN_DEBUGFS] = "debugfs access",
78 [LOCKDOWN_XMON_WR] = "xmon write access",
79 [LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM",
80 [LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM",
81 [LOCKDOWN_RTAS_ERROR_INJECTION] = "RTAS error injection",
82 [LOCKDOWN_INTEGRITY_MAX] = "integrity",
83 [LOCKDOWN_KCORE] = "/proc/kcore access",
84 [LOCKDOWN_KPROBES] = "use of kprobes",
85 [LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM",
86 [LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM",
87 [LOCKDOWN_PERF] = "unsafe use of perf",
88 [LOCKDOWN_TRACEFS] = "use of tracefs",
89 [LOCKDOWN_XMON_RW] = "xmon read and write access",
90 [LOCKDOWN_XFRM_SECRET] = "xfrm SA secret",
91 [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
94 struct security_hook_heads security_hook_heads __ro_after_init;
95 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain);
97 static struct kmem_cache *lsm_file_cache;
98 static struct kmem_cache *lsm_inode_cache;
101 static struct lsm_blob_sizes blob_sizes __ro_after_init;
103 /* Boot-time LSM user choice */
104 static __initdata const char *chosen_lsm_order;
105 static __initdata const char *chosen_major_lsm;
107 static __initconst const char *const builtin_lsm_order = CONFIG_LSM;
109 /* Ordered list of LSMs to initialize. */
110 static __initdata struct lsm_info **ordered_lsms;
111 static __initdata struct lsm_info *exclusive;
113 static __initdata bool debug;
114 #define init_debug(...) \
117 pr_info(__VA_ARGS__); \
120 static bool __init is_enabled(struct lsm_info *lsm)
125 return *lsm->enabled;
128 /* Mark an LSM's enabled flag. */
129 static int lsm_enabled_true __initdata = 1;
130 static int lsm_enabled_false __initdata = 0;
131 static void __init set_enabled(struct lsm_info *lsm, bool enabled)
134 * When an LSM hasn't configured an enable variable, we can use
135 * a hard-coded location for storing the default enabled state.
139 lsm->enabled = &lsm_enabled_true;
141 lsm->enabled = &lsm_enabled_false;
142 } else if (lsm->enabled == &lsm_enabled_true) {
144 lsm->enabled = &lsm_enabled_false;
145 } else if (lsm->enabled == &lsm_enabled_false) {
147 lsm->enabled = &lsm_enabled_true;
149 *lsm->enabled = enabled;
153 /* Is an LSM already listed in the ordered LSMs list? */
154 static bool __init exists_ordered_lsm(struct lsm_info *lsm)
156 struct lsm_info **check;
158 for (check = ordered_lsms; *check; check++)
165 /* Append an LSM to the list of ordered LSMs to initialize. */
166 static int last_lsm __initdata;
167 static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
169 /* Ignore duplicate selections. */
170 if (exists_ordered_lsm(lsm))
173 if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from))
176 /* Enable this LSM, if it is not already set. */
178 lsm->enabled = &lsm_enabled_true;
179 ordered_lsms[last_lsm++] = lsm;
181 init_debug("%s ordered: %s (%s)\n", from, lsm->name,
182 is_enabled(lsm) ? "enabled" : "disabled");
185 /* Is an LSM allowed to be initialized? */
186 static bool __init lsm_allowed(struct lsm_info *lsm)
188 /* Skip if the LSM is disabled. */
189 if (!is_enabled(lsm))
192 /* Not allowed if another exclusive LSM already initialized. */
193 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) {
194 init_debug("exclusive disabled: %s\n", lsm->name);
201 static void __init lsm_set_blob_size(int *need, int *lbs)
208 offset = ALIGN(*lbs, sizeof(void *));
209 *lbs = offset + *need;
213 static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
218 lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
219 lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file);
221 * The inode blob gets an rcu_head in addition to
222 * what the modules might need.
224 if (needed->lbs_inode && blob_sizes.lbs_inode == 0)
225 blob_sizes.lbs_inode = sizeof(struct rcu_head);
226 lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
227 lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
228 lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
229 lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
230 lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
231 lsm_set_blob_size(&needed->lbs_xattr_count,
232 &blob_sizes.lbs_xattr_count);
235 /* Prepare LSM for initialization. */
236 static void __init prepare_lsm(struct lsm_info *lsm)
238 int enabled = lsm_allowed(lsm);
240 /* Record enablement (to handle any following exclusive LSMs). */
241 set_enabled(lsm, enabled);
243 /* If enabled, do pre-initialization work. */
245 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) {
247 init_debug("exclusive chosen: %s\n", lsm->name);
250 lsm_set_blob_sizes(lsm->blobs);
254 /* Initialize a given LSM, if it is enabled. */
255 static void __init initialize_lsm(struct lsm_info *lsm)
257 if (is_enabled(lsm)) {
260 init_debug("initializing %s\n", lsm->name);
262 WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
267 * Current index to use while initializing the lsm id list.
269 u32 lsm_active_cnt __ro_after_init;
270 const struct lsm_id *lsm_idlist[LSM_CONFIG_COUNT];
272 /* Populate ordered LSMs list from comma-separated LSM name list. */
273 static void __init ordered_lsm_parse(const char *order, const char *origin)
275 struct lsm_info *lsm;
276 char *sep, *name, *next;
278 /* LSM_ORDER_FIRST is always first. */
279 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
280 if (lsm->order == LSM_ORDER_FIRST)
281 append_ordered_lsm(lsm, " first");
284 /* Process "security=", if given. */
285 if (chosen_major_lsm) {
286 struct lsm_info *major;
289 * To match the original "security=" behavior, this
290 * explicitly does NOT fallback to another Legacy Major
291 * if the selected one was separately disabled: disable
292 * all non-matching Legacy Major LSMs.
294 for (major = __start_lsm_info; major < __end_lsm_info;
296 if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
297 strcmp(major->name, chosen_major_lsm) != 0) {
298 set_enabled(major, false);
299 init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
300 chosen_major_lsm, major->name);
305 sep = kstrdup(order, GFP_KERNEL);
307 /* Walk the list, looking for matching LSMs. */
308 while ((name = strsep(&next, ",")) != NULL) {
311 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
312 if (strcmp(lsm->name, name) == 0) {
313 if (lsm->order == LSM_ORDER_MUTABLE)
314 append_ordered_lsm(lsm, origin);
320 init_debug("%s ignored: %s (not built into kernel)\n",
324 /* Process "security=", if given. */
325 if (chosen_major_lsm) {
326 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
327 if (exists_ordered_lsm(lsm))
329 if (strcmp(lsm->name, chosen_major_lsm) == 0)
330 append_ordered_lsm(lsm, "security=");
334 /* LSM_ORDER_LAST is always last. */
335 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
336 if (lsm->order == LSM_ORDER_LAST)
337 append_ordered_lsm(lsm, " last");
340 /* Disable all LSMs not in the ordered list. */
341 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
342 if (exists_ordered_lsm(lsm))
344 set_enabled(lsm, false);
345 init_debug("%s skipped: %s (not in requested order)\n",
352 static void __init lsm_early_cred(struct cred *cred);
353 static void __init lsm_early_task(struct task_struct *task);
355 static int lsm_append(const char *new, char **result);
357 static void __init report_lsm_order(void)
359 struct lsm_info **lsm, *early;
362 pr_info("initializing lsm=");
364 /* Report each enabled LSM name, comma separated. */
365 for (early = __start_early_lsm_info;
366 early < __end_early_lsm_info; early++)
367 if (is_enabled(early))
368 pr_cont("%s%s", first++ == 0 ? "" : ",", early->name);
369 for (lsm = ordered_lsms; *lsm; lsm++)
370 if (is_enabled(*lsm))
371 pr_cont("%s%s", first++ == 0 ? "" : ",", (*lsm)->name);
376 static void __init ordered_lsm_init(void)
378 struct lsm_info **lsm;
380 ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms),
383 if (chosen_lsm_order) {
384 if (chosen_major_lsm) {
385 pr_warn("security=%s is ignored because it is superseded by lsm=%s\n",
386 chosen_major_lsm, chosen_lsm_order);
387 chosen_major_lsm = NULL;
389 ordered_lsm_parse(chosen_lsm_order, "cmdline");
391 ordered_lsm_parse(builtin_lsm_order, "builtin");
393 for (lsm = ordered_lsms; *lsm; lsm++)
398 init_debug("cred blob size = %d\n", blob_sizes.lbs_cred);
399 init_debug("file blob size = %d\n", blob_sizes.lbs_file);
400 init_debug("inode blob size = %d\n", blob_sizes.lbs_inode);
401 init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc);
402 init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg);
403 init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
404 init_debug("task blob size = %d\n", blob_sizes.lbs_task);
405 init_debug("xattr slots = %d\n", blob_sizes.lbs_xattr_count);
408 * Create any kmem_caches needed for blobs
410 if (blob_sizes.lbs_file)
411 lsm_file_cache = kmem_cache_create("lsm_file_cache",
412 blob_sizes.lbs_file, 0,
414 if (blob_sizes.lbs_inode)
415 lsm_inode_cache = kmem_cache_create("lsm_inode_cache",
416 blob_sizes.lbs_inode, 0,
419 lsm_early_cred((struct cred *) current->cred);
420 lsm_early_task(current);
421 for (lsm = ordered_lsms; *lsm; lsm++)
422 initialize_lsm(*lsm);
427 int __init early_security_init(void)
429 struct lsm_info *lsm;
431 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
432 INIT_HLIST_HEAD(&security_hook_heads.NAME);
433 #include "linux/lsm_hook_defs.h"
436 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
438 lsm->enabled = &lsm_enabled_true;
447 * security_init - initializes the security framework
449 * This should be called early in the kernel initialization sequence.
451 int __init security_init(void)
453 struct lsm_info *lsm;
455 init_debug("legacy security=%s\n", chosen_major_lsm ? : " *unspecified*");
456 init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order);
457 init_debug("boot arg lsm=%s\n", chosen_lsm_order ? : " *unspecified*");
460 * Append the names of the early LSM modules now that kmalloc() is
463 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
464 init_debug(" early started: %s (%s)\n", lsm->name,
465 is_enabled(lsm) ? "enabled" : "disabled");
467 lsm_append(lsm->name, &lsm_names);
470 /* Load LSMs in specified order. */
476 /* Save user chosen LSM */
477 static int __init choose_major_lsm(char *str)
479 chosen_major_lsm = str;
482 __setup("security=", choose_major_lsm);
484 /* Explicitly choose LSM initialization order. */
485 static int __init choose_lsm_order(char *str)
487 chosen_lsm_order = str;
490 __setup("lsm=", choose_lsm_order);
492 /* Enable LSM order debugging. */
493 static int __init enable_debug(char *str)
498 __setup("lsm.debug", enable_debug);
500 static bool match_last_lsm(const char *list, const char *lsm)
504 if (WARN_ON(!list || !lsm))
506 last = strrchr(list, ',');
508 /* Pass the comma, strcmp() will check for '\0' */
512 return !strcmp(last, lsm);
515 static int lsm_append(const char *new, char **result)
519 if (*result == NULL) {
520 *result = kstrdup(new, GFP_KERNEL);
524 /* Check if it is the last registered name */
525 if (match_last_lsm(*result, new))
527 cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
537 * security_add_hooks - Add a modules hooks to the hook lists.
538 * @hooks: the hooks to add
539 * @count: the number of hooks to add
540 * @lsmid: the identification information for the security module
542 * Each LSM has to register its hooks with the infrastructure.
544 void __init security_add_hooks(struct security_hook_list *hooks, int count,
545 const struct lsm_id *lsmid)
550 * A security module may call security_add_hooks() more
551 * than once during initialization, and LSM initialization
552 * is serialized. Landlock is one such case.
553 * Look at the previous entry, if there is one, for duplication.
555 if (lsm_active_cnt == 0 || lsm_idlist[lsm_active_cnt - 1] != lsmid) {
556 if (lsm_active_cnt >= LSM_CONFIG_COUNT)
557 panic("%s Too many LSMs registered.\n", __func__);
558 lsm_idlist[lsm_active_cnt++] = lsmid;
561 for (i = 0; i < count; i++) {
562 hooks[i].lsmid = lsmid;
563 hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
567 * Don't try to append during early_security_init(), we'll come back
568 * and fix this up afterwards.
570 if (slab_is_available()) {
571 if (lsm_append(lsmid->name, &lsm_names) < 0)
572 panic("%s - Cannot get early memory.\n", __func__);
576 int call_blocking_lsm_notifier(enum lsm_event event, void *data)
578 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain,
581 EXPORT_SYMBOL(call_blocking_lsm_notifier);
583 int register_blocking_lsm_notifier(struct notifier_block *nb)
585 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain,
588 EXPORT_SYMBOL(register_blocking_lsm_notifier);
590 int unregister_blocking_lsm_notifier(struct notifier_block *nb)
592 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain,
595 EXPORT_SYMBOL(unregister_blocking_lsm_notifier);
598 * lsm_cred_alloc - allocate a composite cred blob
599 * @cred: the cred that needs a blob
600 * @gfp: allocation type
602 * Allocate the cred blob for all the modules
604 * Returns 0, or -ENOMEM if memory can't be allocated.
606 static int lsm_cred_alloc(struct cred *cred, gfp_t gfp)
608 if (blob_sizes.lbs_cred == 0) {
609 cred->security = NULL;
613 cred->security = kzalloc(blob_sizes.lbs_cred, gfp);
614 if (cred->security == NULL)
620 * lsm_early_cred - during initialization allocate a composite cred blob
621 * @cred: the cred that needs a blob
623 * Allocate the cred blob for all the modules
625 static void __init lsm_early_cred(struct cred *cred)
627 int rc = lsm_cred_alloc(cred, GFP_KERNEL);
630 panic("%s: Early cred alloc failed.\n", __func__);
634 * lsm_file_alloc - allocate a composite file blob
635 * @file: the file that needs a blob
637 * Allocate the file blob for all the modules
639 * Returns 0, or -ENOMEM if memory can't be allocated.
641 static int lsm_file_alloc(struct file *file)
643 if (!lsm_file_cache) {
644 file->f_security = NULL;
648 file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL);
649 if (file->f_security == NULL)
655 * lsm_inode_alloc - allocate a composite inode blob
656 * @inode: the inode that needs a blob
658 * Allocate the inode blob for all the modules
660 * Returns 0, or -ENOMEM if memory can't be allocated.
662 int lsm_inode_alloc(struct inode *inode)
664 if (!lsm_inode_cache) {
665 inode->i_security = NULL;
669 inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS);
670 if (inode->i_security == NULL)
676 * lsm_task_alloc - allocate a composite task blob
677 * @task: the task that needs a blob
679 * Allocate the task blob for all the modules
681 * Returns 0, or -ENOMEM if memory can't be allocated.
683 static int lsm_task_alloc(struct task_struct *task)
685 if (blob_sizes.lbs_task == 0) {
686 task->security = NULL;
690 task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
691 if (task->security == NULL)
697 * lsm_ipc_alloc - allocate a composite ipc blob
698 * @kip: the ipc that needs a blob
700 * Allocate the ipc blob for all the modules
702 * Returns 0, or -ENOMEM if memory can't be allocated.
704 static int lsm_ipc_alloc(struct kern_ipc_perm *kip)
706 if (blob_sizes.lbs_ipc == 0) {
707 kip->security = NULL;
711 kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL);
712 if (kip->security == NULL)
718 * lsm_msg_msg_alloc - allocate a composite msg_msg blob
719 * @mp: the msg_msg that needs a blob
721 * Allocate the ipc blob for all the modules
723 * Returns 0, or -ENOMEM if memory can't be allocated.
725 static int lsm_msg_msg_alloc(struct msg_msg *mp)
727 if (blob_sizes.lbs_msg_msg == 0) {
732 mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL);
733 if (mp->security == NULL)
739 * lsm_early_task - during initialization allocate a composite task blob
740 * @task: the task that needs a blob
742 * Allocate the task blob for all the modules
744 static void __init lsm_early_task(struct task_struct *task)
746 int rc = lsm_task_alloc(task);
749 panic("%s: Early task alloc failed.\n", __func__);
753 * lsm_superblock_alloc - allocate a composite superblock blob
754 * @sb: the superblock that needs a blob
756 * Allocate the superblock blob for all the modules
758 * Returns 0, or -ENOMEM if memory can't be allocated.
760 static int lsm_superblock_alloc(struct super_block *sb)
762 if (blob_sizes.lbs_superblock == 0) {
763 sb->s_security = NULL;
767 sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL);
768 if (sb->s_security == NULL)
774 * lsm_fill_user_ctx - Fill a user space lsm_ctx structure
775 * @uctx: a userspace LSM context to be filled
776 * @uctx_len: available uctx size (input), used uctx size (output)
777 * @val: the new LSM context value
778 * @val_len: the size of the new LSM context value
780 * @flags: LSM defined flags
782 * Fill all of the fields in a userspace lsm_ctx structure.
784 * Returns 0 on success, -E2BIG if userspace buffer is not large enough,
785 * -EFAULT on a copyout error, -ENOMEM if memory can't be allocated.
787 int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, size_t *uctx_len,
788 void *val, size_t val_len,
791 struct lsm_ctx *nctx = NULL;
795 nctx_len = ALIGN(struct_size(nctx, ctx, val_len), sizeof(void *));
796 if (nctx_len > *uctx_len) {
801 nctx = kzalloc(nctx_len, GFP_KERNEL);
808 nctx->len = nctx_len;
809 nctx->ctx_len = val_len;
810 memcpy(nctx->ctx, val, val_len);
812 if (copy_to_user(uctx, nctx, nctx_len))
817 *uctx_len = nctx_len;
822 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
823 * can be accessed with:
825 * LSM_RET_DEFAULT(<hook_name>)
827 * The macros below define static constants for the default value of each
830 #define LSM_RET_DEFAULT(NAME) (NAME##_default)
831 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
832 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
833 static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
834 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
835 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
837 #include <linux/lsm_hook_defs.h>
841 * Hook list operation macros.
844 * This is a hook that does not return a value.
847 * This is a hook that returns a value.
850 #define call_void_hook(FUNC, ...) \
852 struct security_hook_list *P; \
854 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
855 P->hook.FUNC(__VA_ARGS__); \
858 #define call_int_hook(FUNC, IRC, ...) ({ \
861 struct security_hook_list *P; \
863 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
864 RC = P->hook.FUNC(__VA_ARGS__); \
872 /* Security operations */
875 * security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
876 * @mgr: task credentials of current binder process
878 * Check whether @mgr is allowed to be the binder context manager.
880 * Return: Return 0 if permission is granted.
882 int security_binder_set_context_mgr(const struct cred *mgr)
884 return call_int_hook(binder_set_context_mgr, 0, mgr);
888 * security_binder_transaction() - Check if a binder transaction is allowed
889 * @from: sending process
890 * @to: receiving process
892 * Check whether @from is allowed to invoke a binder transaction call to @to.
894 * Return: Returns 0 if permission is granted.
896 int security_binder_transaction(const struct cred *from,
897 const struct cred *to)
899 return call_int_hook(binder_transaction, 0, from, to);
903 * security_binder_transfer_binder() - Check if a binder transfer is allowed
904 * @from: sending process
905 * @to: receiving process
907 * Check whether @from is allowed to transfer a binder reference to @to.
909 * Return: Returns 0 if permission is granted.
911 int security_binder_transfer_binder(const struct cred *from,
912 const struct cred *to)
914 return call_int_hook(binder_transfer_binder, 0, from, to);
918 * security_binder_transfer_file() - Check if a binder file xfer is allowed
919 * @from: sending process
920 * @to: receiving process
921 * @file: file being transferred
923 * Check whether @from is allowed to transfer @file to @to.
925 * Return: Returns 0 if permission is granted.
927 int security_binder_transfer_file(const struct cred *from,
928 const struct cred *to, const struct file *file)
930 return call_int_hook(binder_transfer_file, 0, from, to, file);
934 * security_ptrace_access_check() - Check if tracing is allowed
935 * @child: target process
936 * @mode: PTRACE_MODE flags
938 * Check permission before allowing the current process to trace the @child
939 * process. Security modules may also want to perform a process tracing check
940 * during an execve in the set_security or apply_creds hooks of tracing check
941 * during an execve in the bprm_set_creds hook of binprm_security_ops if the
942 * process is being traced and its security attributes would be changed by the
945 * Return: Returns 0 if permission is granted.
947 int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
949 return call_int_hook(ptrace_access_check, 0, child, mode);
953 * security_ptrace_traceme() - Check if tracing is allowed
954 * @parent: tracing process
956 * Check that the @parent process has sufficient permission to trace the
957 * current process before allowing the current process to present itself to the
958 * @parent process for tracing.
960 * Return: Returns 0 if permission is granted.
962 int security_ptrace_traceme(struct task_struct *parent)
964 return call_int_hook(ptrace_traceme, 0, parent);
968 * security_capget() - Get the capability sets for a process
969 * @target: target process
970 * @effective: effective capability set
971 * @inheritable: inheritable capability set
972 * @permitted: permitted capability set
974 * Get the @effective, @inheritable, and @permitted capability sets for the
975 * @target process. The hook may also perform permission checking to determine
976 * if the current process is allowed to see the capability sets of the @target
979 * Return: Returns 0 if the capability sets were successfully obtained.
981 int security_capget(const struct task_struct *target,
982 kernel_cap_t *effective,
983 kernel_cap_t *inheritable,
984 kernel_cap_t *permitted)
986 return call_int_hook(capget, 0, target,
987 effective, inheritable, permitted);
991 * security_capset() - Set the capability sets for a process
992 * @new: new credentials for the target process
993 * @old: current credentials of the target process
994 * @effective: effective capability set
995 * @inheritable: inheritable capability set
996 * @permitted: permitted capability set
998 * Set the @effective, @inheritable, and @permitted capability sets for the
1001 * Return: Returns 0 and update @new if permission is granted.
1003 int security_capset(struct cred *new, const struct cred *old,
1004 const kernel_cap_t *effective,
1005 const kernel_cap_t *inheritable,
1006 const kernel_cap_t *permitted)
1008 return call_int_hook(capset, 0, new, old,
1009 effective, inheritable, permitted);
1013 * security_capable() - Check if a process has the necessary capability
1014 * @cred: credentials to examine
1015 * @ns: user namespace
1016 * @cap: capability requested
1017 * @opts: capability check options
1019 * Check whether the @tsk process has the @cap capability in the indicated
1020 * credentials. @cap contains the capability <include/linux/capability.h>.
1021 * @opts contains options for the capable check <include/linux/security.h>.
1023 * Return: Returns 0 if the capability is granted.
1025 int security_capable(const struct cred *cred,
1026 struct user_namespace *ns,
1030 return call_int_hook(capable, 0, cred, ns, cap, opts);
1034 * security_quotactl() - Check if a quotactl() syscall is allowed for this fs
1040 * Check whether the quotactl syscall is allowed for this @sb.
1042 * Return: Returns 0 if permission is granted.
1044 int security_quotactl(int cmds, int type, int id, const struct super_block *sb)
1046 return call_int_hook(quotactl, 0, cmds, type, id, sb);
1050 * security_quota_on() - Check if QUOTAON is allowed for a dentry
1053 * Check whether QUOTAON is allowed for @dentry.
1055 * Return: Returns 0 if permission is granted.
1057 int security_quota_on(struct dentry *dentry)
1059 return call_int_hook(quota_on, 0, dentry);
1063 * security_syslog() - Check if accessing the kernel message ring is allowed
1064 * @type: SYSLOG_ACTION_* type
1066 * Check permission before accessing the kernel message ring or changing
1067 * logging to the console. See the syslog(2) manual page for an explanation of
1070 * Return: Return 0 if permission is granted.
1072 int security_syslog(int type)
1074 return call_int_hook(syslog, 0, type);
1078 * security_settime64() - Check if changing the system time is allowed
1082 * Check permission to change the system time, struct timespec64 is defined in
1083 * <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
1085 * Return: Returns 0 if permission is granted.
1087 int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
1089 return call_int_hook(settime, 0, ts, tz);
1093 * security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
1095 * @pages: number of pages
1097 * Check permissions for allocating a new virtual mapping. If all LSMs return
1098 * a positive value, __vm_enough_memory() will be called with cap_sys_admin
1099 * set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
1100 * called with cap_sys_admin cleared.
1102 * Return: Returns 0 if permission is granted by the LSM infrastructure to the
1105 int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
1107 struct security_hook_list *hp;
1108 int cap_sys_admin = 1;
1112 * The module will respond with a positive value if
1113 * it thinks the __vm_enough_memory() call should be
1114 * made with the cap_sys_admin set. If all of the modules
1115 * agree that it should be set it will. If any module
1116 * thinks it should not be set it won't.
1118 hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
1119 rc = hp->hook.vm_enough_memory(mm, pages);
1125 return __vm_enough_memory(mm, pages, cap_sys_admin);
1129 * security_bprm_creds_for_exec() - Prepare the credentials for exec()
1130 * @bprm: binary program information
1132 * If the setup in prepare_exec_creds did not setup @bprm->cred->security
1133 * properly for executing @bprm->file, update the LSM's portion of
1134 * @bprm->cred->security to be what commit_creds needs to install for the new
1135 * program. This hook may also optionally check permissions (e.g. for
1136 * transitions between security domains). The hook must set @bprm->secureexec
1137 * to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
1138 * contains the linux_binprm structure.
1140 * Return: Returns 0 if the hook is successful and permission is granted.
1142 int security_bprm_creds_for_exec(struct linux_binprm *bprm)
1144 return call_int_hook(bprm_creds_for_exec, 0, bprm);
1148 * security_bprm_creds_from_file() - Update linux_binprm creds based on file
1149 * @bprm: binary program information
1150 * @file: associated file
1152 * If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
1153 * exec, update @bprm->cred to reflect that change. This is called after
1154 * finding the binary that will be executed without an interpreter. This
1155 * ensures that the credentials will not be derived from a script that the
1156 * binary will need to reopen, which when reopend may end up being a completely
1157 * different file. This hook may also optionally check permissions (e.g. for
1158 * transitions between security domains). The hook must set @bprm->secureexec
1159 * to 1 if AT_SECURE should be set to request libc enable secure mode. The
1160 * hook must add to @bprm->per_clear any personality flags that should be
1161 * cleared from current->personality. @bprm contains the linux_binprm
1164 * Return: Returns 0 if the hook is successful and permission is granted.
1166 int security_bprm_creds_from_file(struct linux_binprm *bprm, const struct file *file)
1168 return call_int_hook(bprm_creds_from_file, 0, bprm, file);
1172 * security_bprm_check() - Mediate binary handler search
1173 * @bprm: binary program information
1175 * This hook mediates the point when a search for a binary handler will begin.
1176 * It allows a check against the @bprm->cred->security value which was set in
1177 * the preceding creds_for_exec call. The argv list and envp list are reliably
1178 * available in @bprm. This hook may be called multiple times during a single
1179 * execve. @bprm contains the linux_binprm structure.
1181 * Return: Returns 0 if the hook is successful and permission is granted.
1183 int security_bprm_check(struct linux_binprm *bprm)
1187 ret = call_int_hook(bprm_check_security, 0, bprm);
1190 return ima_bprm_check(bprm);
1194 * security_bprm_committing_creds() - Install creds for a process during exec()
1195 * @bprm: binary program information
1197 * Prepare to install the new security attributes of a process being
1198 * transformed by an execve operation, based on the old credentials pointed to
1199 * by @current->cred and the information set in @bprm->cred by the
1200 * bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
1201 * hook is a good place to perform state changes on the process such as closing
1202 * open file descriptors to which access will no longer be granted when the
1203 * attributes are changed. This is called immediately before commit_creds().
1205 void security_bprm_committing_creds(const struct linux_binprm *bprm)
1207 call_void_hook(bprm_committing_creds, bprm);
1211 * security_bprm_committed_creds() - Tidy up after cred install during exec()
1212 * @bprm: binary program information
1214 * Tidy up after the installation of the new security attributes of a process
1215 * being transformed by an execve operation. The new credentials have, by this
1216 * point, been set to @current->cred. @bprm points to the linux_binprm
1217 * structure. This hook is a good place to perform state changes on the
1218 * process such as clearing out non-inheritable signal state. This is called
1219 * immediately after commit_creds().
1221 void security_bprm_committed_creds(const struct linux_binprm *bprm)
1223 call_void_hook(bprm_committed_creds, bprm);
1227 * security_fs_context_submount() - Initialise fc->security
1228 * @fc: new filesystem context
1229 * @reference: dentry reference for submount/remount
1231 * Fill out the ->security field for a new fs_context.
1233 * Return: Returns 0 on success or negative error code on failure.
1235 int security_fs_context_submount(struct fs_context *fc, struct super_block *reference)
1237 return call_int_hook(fs_context_submount, 0, fc, reference);
1241 * security_fs_context_dup() - Duplicate a fs_context LSM blob
1242 * @fc: destination filesystem context
1243 * @src_fc: source filesystem context
1245 * Allocate and attach a security structure to sc->security. This pointer is
1246 * initialised to NULL by the caller. @fc indicates the new filesystem context.
1247 * @src_fc indicates the original filesystem context.
1249 * Return: Returns 0 on success or a negative error code on failure.
1251 int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1253 return call_int_hook(fs_context_dup, 0, fc, src_fc);
1257 * security_fs_context_parse_param() - Configure a filesystem context
1258 * @fc: filesystem context
1259 * @param: filesystem parameter
1261 * Userspace provided a parameter to configure a superblock. The LSM can
1262 * consume the parameter or return it to the caller for use elsewhere.
1264 * Return: If the parameter is used by the LSM it should return 0, if it is
1265 * returned to the caller -ENOPARAM is returned, otherwise a negative
1266 * error code is returned.
1268 int security_fs_context_parse_param(struct fs_context *fc,
1269 struct fs_parameter *param)
1271 struct security_hook_list *hp;
1275 hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param,
1277 trc = hp->hook.fs_context_parse_param(fc, param);
1280 else if (trc != -ENOPARAM)
1287 * security_sb_alloc() - Allocate a super_block LSM blob
1288 * @sb: filesystem superblock
1290 * Allocate and attach a security structure to the sb->s_security field. The
1291 * s_security field is initialized to NULL when the structure is allocated.
1292 * @sb contains the super_block structure to be modified.
1294 * Return: Returns 0 if operation was successful.
1296 int security_sb_alloc(struct super_block *sb)
1298 int rc = lsm_superblock_alloc(sb);
1302 rc = call_int_hook(sb_alloc_security, 0, sb);
1304 security_sb_free(sb);
1309 * security_sb_delete() - Release super_block LSM associated objects
1310 * @sb: filesystem superblock
1312 * Release objects tied to a superblock (e.g. inodes). @sb contains the
1313 * super_block structure being released.
1315 void security_sb_delete(struct super_block *sb)
1317 call_void_hook(sb_delete, sb);
1321 * security_sb_free() - Free a super_block LSM blob
1322 * @sb: filesystem superblock
1324 * Deallocate and clear the sb->s_security field. @sb contains the super_block
1325 * structure to be modified.
1327 void security_sb_free(struct super_block *sb)
1329 call_void_hook(sb_free_security, sb);
1330 kfree(sb->s_security);
1331 sb->s_security = NULL;
1335 * security_free_mnt_opts() - Free memory associated with mount options
1336 * @mnt_opts: LSM processed mount options
1338 * Free memory associated with @mnt_ops.
1340 void security_free_mnt_opts(void **mnt_opts)
1344 call_void_hook(sb_free_mnt_opts, *mnt_opts);
1347 EXPORT_SYMBOL(security_free_mnt_opts);
1350 * security_sb_eat_lsm_opts() - Consume LSM mount options
1351 * @options: mount options
1352 * @mnt_opts: LSM processed mount options
1354 * Eat (scan @options) and save them in @mnt_opts.
1356 * Return: Returns 0 on success, negative values on failure.
1358 int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
1360 return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts);
1362 EXPORT_SYMBOL(security_sb_eat_lsm_opts);
1365 * security_sb_mnt_opts_compat() - Check if new mount options are allowed
1366 * @sb: filesystem superblock
1367 * @mnt_opts: new mount options
1369 * Determine if the new mount options in @mnt_opts are allowed given the
1370 * existing mounted filesystem at @sb. @sb superblock being compared.
1372 * Return: Returns 0 if options are compatible.
1374 int security_sb_mnt_opts_compat(struct super_block *sb,
1377 return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts);
1379 EXPORT_SYMBOL(security_sb_mnt_opts_compat);
1382 * security_sb_remount() - Verify no incompatible mount changes during remount
1383 * @sb: filesystem superblock
1384 * @mnt_opts: (re)mount options
1386 * Extracts security system specific mount options and verifies no changes are
1387 * being made to those options.
1389 * Return: Returns 0 if permission is granted.
1391 int security_sb_remount(struct super_block *sb,
1394 return call_int_hook(sb_remount, 0, sb, mnt_opts);
1396 EXPORT_SYMBOL(security_sb_remount);
1399 * security_sb_kern_mount() - Check if a kernel mount is allowed
1400 * @sb: filesystem superblock
1402 * Mount this @sb if allowed by permissions.
1404 * Return: Returns 0 if permission is granted.
1406 int security_sb_kern_mount(const struct super_block *sb)
1408 return call_int_hook(sb_kern_mount, 0, sb);
1412 * security_sb_show_options() - Output the mount options for a superblock
1414 * @sb: filesystem superblock
1416 * Show (print on @m) mount options for this @sb.
1418 * Return: Returns 0 on success, negative values on failure.
1420 int security_sb_show_options(struct seq_file *m, struct super_block *sb)
1422 return call_int_hook(sb_show_options, 0, m, sb);
1426 * security_sb_statfs() - Check if accessing fs stats is allowed
1427 * @dentry: superblock handle
1429 * Check permission before obtaining filesystem statistics for the @mnt
1430 * mountpoint. @dentry is a handle on the superblock for the filesystem.
1432 * Return: Returns 0 if permission is granted.
1434 int security_sb_statfs(struct dentry *dentry)
1436 return call_int_hook(sb_statfs, 0, dentry);
1440 * security_sb_mount() - Check permission for mounting a filesystem
1441 * @dev_name: filesystem backing device
1442 * @path: mount point
1443 * @type: filesystem type
1444 * @flags: mount flags
1445 * @data: filesystem specific data
1447 * Check permission before an object specified by @dev_name is mounted on the
1448 * mount point named by @nd. For an ordinary mount, @dev_name identifies a
1449 * device if the file system type requires a device. For a remount
1450 * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
1451 * (@flags & MS_BIND), @dev_name identifies the pathname of the object being
1454 * Return: Returns 0 if permission is granted.
1456 int security_sb_mount(const char *dev_name, const struct path *path,
1457 const char *type, unsigned long flags, void *data)
1459 return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data);
1463 * security_sb_umount() - Check permission for unmounting a filesystem
1464 * @mnt: mounted filesystem
1465 * @flags: unmount flags
1467 * Check permission before the @mnt file system is unmounted.
1469 * Return: Returns 0 if permission is granted.
1471 int security_sb_umount(struct vfsmount *mnt, int flags)
1473 return call_int_hook(sb_umount, 0, mnt, flags);
1477 * security_sb_pivotroot() - Check permissions for pivoting the rootfs
1478 * @old_path: new location for current rootfs
1479 * @new_path: location of the new rootfs
1481 * Check permission before pivoting the root filesystem.
1483 * Return: Returns 0 if permission is granted.
1485 int security_sb_pivotroot(const struct path *old_path,
1486 const struct path *new_path)
1488 return call_int_hook(sb_pivotroot, 0, old_path, new_path);
1492 * security_sb_set_mnt_opts() - Set the mount options for a filesystem
1493 * @sb: filesystem superblock
1494 * @mnt_opts: binary mount options
1495 * @kern_flags: kernel flags (in)
1496 * @set_kern_flags: kernel flags (out)
1498 * Set the security relevant mount options used for a superblock.
1500 * Return: Returns 0 on success, error on failure.
1502 int security_sb_set_mnt_opts(struct super_block *sb,
1504 unsigned long kern_flags,
1505 unsigned long *set_kern_flags)
1507 return call_int_hook(sb_set_mnt_opts,
1508 mnt_opts ? -EOPNOTSUPP : 0, sb,
1509 mnt_opts, kern_flags, set_kern_flags);
1511 EXPORT_SYMBOL(security_sb_set_mnt_opts);
1514 * security_sb_clone_mnt_opts() - Duplicate superblock mount options
1515 * @oldsb: source superblock
1516 * @newsb: destination superblock
1517 * @kern_flags: kernel flags (in)
1518 * @set_kern_flags: kernel flags (out)
1520 * Copy all security options from a given superblock to another.
1522 * Return: Returns 0 on success, error on failure.
1524 int security_sb_clone_mnt_opts(const struct super_block *oldsb,
1525 struct super_block *newsb,
1526 unsigned long kern_flags,
1527 unsigned long *set_kern_flags)
1529 return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb,
1530 kern_flags, set_kern_flags);
1532 EXPORT_SYMBOL(security_sb_clone_mnt_opts);
1535 * security_move_mount() - Check permissions for moving a mount
1536 * @from_path: source mount point
1537 * @to_path: destination mount point
1539 * Check permission before a mount is moved.
1541 * Return: Returns 0 if permission is granted.
1543 int security_move_mount(const struct path *from_path,
1544 const struct path *to_path)
1546 return call_int_hook(move_mount, 0, from_path, to_path);
1550 * security_path_notify() - Check if setting a watch is allowed
1553 * @obj_type: file path type
1555 * Check permissions before setting a watch on events as defined by @mask, on
1556 * an object at @path, whose type is defined by @obj_type.
1558 * Return: Returns 0 if permission is granted.
1560 int security_path_notify(const struct path *path, u64 mask,
1561 unsigned int obj_type)
1563 return call_int_hook(path_notify, 0, path, mask, obj_type);
1567 * security_inode_alloc() - Allocate an inode LSM blob
1570 * Allocate and attach a security structure to @inode->i_security. The
1571 * i_security field is initialized to NULL when the inode structure is
1574 * Return: Return 0 if operation was successful.
1576 int security_inode_alloc(struct inode *inode)
1578 int rc = lsm_inode_alloc(inode);
1582 rc = call_int_hook(inode_alloc_security, 0, inode);
1584 security_inode_free(inode);
1588 static void inode_free_by_rcu(struct rcu_head *head)
1591 * The rcu head is at the start of the inode blob
1593 kmem_cache_free(lsm_inode_cache, head);
1597 * security_inode_free() - Free an inode's LSM blob
1600 * Deallocate the inode security structure and set @inode->i_security to NULL.
1602 void security_inode_free(struct inode *inode)
1604 integrity_inode_free(inode);
1605 call_void_hook(inode_free_security, inode);
1607 * The inode may still be referenced in a path walk and
1608 * a call to security_inode_permission() can be made
1609 * after inode_free_security() is called. Ideally, the VFS
1610 * wouldn't do this, but fixing that is a much harder
1611 * job. For now, simply free the i_security via RCU, and
1612 * leave the current inode->i_security pointer intact.
1613 * The inode will be freed after the RCU grace period too.
1615 if (inode->i_security)
1616 call_rcu((struct rcu_head *)inode->i_security,
1621 * security_dentry_init_security() - Perform dentry initialization
1622 * @dentry: the dentry to initialize
1623 * @mode: mode used to determine resource type
1624 * @name: name of the last path component
1625 * @xattr_name: name of the security/LSM xattr
1626 * @ctx: pointer to the resulting LSM context
1627 * @ctxlen: length of @ctx
1629 * Compute a context for a dentry as the inode is not yet available since NFSv4
1630 * has no label backed by an EA anyway. It is important to note that
1631 * @xattr_name does not need to be free'd by the caller, it is a static string.
1633 * Return: Returns 0 on success, negative values on failure.
1635 int security_dentry_init_security(struct dentry *dentry, int mode,
1636 const struct qstr *name,
1637 const char **xattr_name, void **ctx,
1640 struct security_hook_list *hp;
1644 * Only one module will provide a security context.
1646 hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security,
1648 rc = hp->hook.dentry_init_security(dentry, mode, name,
1649 xattr_name, ctx, ctxlen);
1650 if (rc != LSM_RET_DEFAULT(dentry_init_security))
1653 return LSM_RET_DEFAULT(dentry_init_security);
1655 EXPORT_SYMBOL(security_dentry_init_security);
1658 * security_dentry_create_files_as() - Perform dentry initialization
1659 * @dentry: the dentry to initialize
1660 * @mode: mode used to determine resource type
1661 * @name: name of the last path component
1662 * @old: creds to use for LSM context calculations
1663 * @new: creds to modify
1665 * Compute a context for a dentry as the inode is not yet available and set
1666 * that context in passed in creds so that new files are created using that
1667 * context. Context is calculated using the passed in creds and not the creds
1670 * Return: Returns 0 on success, error on failure.
1672 int security_dentry_create_files_as(struct dentry *dentry, int mode,
1674 const struct cred *old, struct cred *new)
1676 return call_int_hook(dentry_create_files_as, 0, dentry, mode,
1679 EXPORT_SYMBOL(security_dentry_create_files_as);
1682 * security_inode_init_security() - Initialize an inode's LSM context
1684 * @dir: parent directory
1685 * @qstr: last component of the pathname
1686 * @initxattrs: callback function to write xattrs
1687 * @fs_data: filesystem specific data
1689 * Obtain the security attribute name suffix and value to set on a newly
1690 * created inode and set up the incore security field for the new inode. This
1691 * hook is called by the fs code as part of the inode creation transaction and
1692 * provides for atomic labeling of the inode, unlike the post_create/mkdir/...
1693 * hooks called by the VFS.
1695 * The hook function is expected to populate the xattrs array, by calling
1696 * lsm_get_xattr_slot() to retrieve the slots reserved by the security module
1697 * with the lbs_xattr_count field of the lsm_blob_sizes structure. For each
1698 * slot, the hook function should set ->name to the attribute name suffix
1699 * (e.g. selinux), to allocate ->value (will be freed by the caller) and set it
1700 * to the attribute value, to set ->value_len to the length of the value. If
1701 * the security module does not use security attributes or does not wish to put
1702 * a security attribute on this particular inode, then it should return
1703 * -EOPNOTSUPP to skip this processing.
1705 * Return: Returns 0 if the LSM successfully initialized all of the inode
1706 * security attributes that are required, negative values otherwise.
1708 int security_inode_init_security(struct inode *inode, struct inode *dir,
1709 const struct qstr *qstr,
1710 const initxattrs initxattrs, void *fs_data)
1712 struct security_hook_list *hp;
1713 struct xattr *new_xattrs = NULL;
1714 int ret = -EOPNOTSUPP, xattr_count = 0;
1716 if (unlikely(IS_PRIVATE(inode)))
1719 if (!blob_sizes.lbs_xattr_count)
1723 /* Allocate +1 for EVM and +1 as terminator. */
1724 new_xattrs = kcalloc(blob_sizes.lbs_xattr_count + 2,
1725 sizeof(*new_xattrs), GFP_NOFS);
1730 hlist_for_each_entry(hp, &security_hook_heads.inode_init_security,
1732 ret = hp->hook.inode_init_security(inode, dir, qstr, new_xattrs,
1734 if (ret && ret != -EOPNOTSUPP)
1737 * As documented in lsm_hooks.h, -EOPNOTSUPP in this context
1738 * means that the LSM is not willing to provide an xattr, not
1739 * that it wants to signal an error. Thus, continue to invoke
1740 * the remaining LSMs.
1744 /* If initxattrs() is NULL, xattr_count is zero, skip the call. */
1748 ret = evm_inode_init_security(inode, dir, qstr, new_xattrs,
1752 ret = initxattrs(inode, new_xattrs, fs_data);
1754 for (; xattr_count > 0; xattr_count--)
1755 kfree(new_xattrs[xattr_count - 1].value);
1757 return (ret == -EOPNOTSUPP) ? 0 : ret;
1759 EXPORT_SYMBOL(security_inode_init_security);
1762 * security_inode_init_security_anon() - Initialize an anonymous inode
1764 * @name: the anonymous inode class
1765 * @context_inode: an optional related inode
1767 * Set up the incore security field for the new anonymous inode and return
1768 * whether the inode creation is permitted by the security module or not.
1770 * Return: Returns 0 on success, -EACCES if the security module denies the
1771 * creation of this inode, or another -errno upon other errors.
1773 int security_inode_init_security_anon(struct inode *inode,
1774 const struct qstr *name,
1775 const struct inode *context_inode)
1777 return call_int_hook(inode_init_security_anon, 0, inode, name,
1781 #ifdef CONFIG_SECURITY_PATH
1783 * security_path_mknod() - Check if creating a special file is allowed
1784 * @dir: parent directory
1786 * @mode: new file mode
1787 * @dev: device number
1789 * Check permissions when creating a file. Note that this hook is called even
1790 * if mknod operation is being done for a regular file.
1792 * Return: Returns 0 if permission is granted.
1794 int security_path_mknod(const struct path *dir, struct dentry *dentry,
1795 umode_t mode, unsigned int dev)
1797 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1799 return call_int_hook(path_mknod, 0, dir, dentry, mode, dev);
1801 EXPORT_SYMBOL(security_path_mknod);
1804 * security_path_mkdir() - Check if creating a new directory is allowed
1805 * @dir: parent directory
1806 * @dentry: new directory
1807 * @mode: new directory mode
1809 * Check permissions to create a new directory in the existing directory.
1811 * Return: Returns 0 if permission is granted.
1813 int security_path_mkdir(const struct path *dir, struct dentry *dentry,
1816 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1818 return call_int_hook(path_mkdir, 0, dir, dentry, mode);
1820 EXPORT_SYMBOL(security_path_mkdir);
1823 * security_path_rmdir() - Check if removing a directory is allowed
1824 * @dir: parent directory
1825 * @dentry: directory to remove
1827 * Check the permission to remove a directory.
1829 * Return: Returns 0 if permission is granted.
1831 int security_path_rmdir(const struct path *dir, struct dentry *dentry)
1833 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1835 return call_int_hook(path_rmdir, 0, dir, dentry);
1839 * security_path_unlink() - Check if removing a hard link is allowed
1840 * @dir: parent directory
1843 * Check the permission to remove a hard link to a file.
1845 * Return: Returns 0 if permission is granted.
1847 int security_path_unlink(const struct path *dir, struct dentry *dentry)
1849 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1851 return call_int_hook(path_unlink, 0, dir, dentry);
1853 EXPORT_SYMBOL(security_path_unlink);
1856 * security_path_symlink() - Check if creating a symbolic link is allowed
1857 * @dir: parent directory
1858 * @dentry: symbolic link
1859 * @old_name: file pathname
1861 * Check the permission to create a symbolic link to a file.
1863 * Return: Returns 0 if permission is granted.
1865 int security_path_symlink(const struct path *dir, struct dentry *dentry,
1866 const char *old_name)
1868 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1870 return call_int_hook(path_symlink, 0, dir, dentry, old_name);
1874 * security_path_link - Check if creating a hard link is allowed
1875 * @old_dentry: existing file
1876 * @new_dir: new parent directory
1877 * @new_dentry: new link
1879 * Check permission before creating a new hard link to a file.
1881 * Return: Returns 0 if permission is granted.
1883 int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
1884 struct dentry *new_dentry)
1886 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
1888 return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry);
1892 * security_path_rename() - Check if renaming a file is allowed
1893 * @old_dir: parent directory of the old file
1894 * @old_dentry: the old file
1895 * @new_dir: parent directory of the new file
1896 * @new_dentry: the new file
1899 * Check for permission to rename a file or directory.
1901 * Return: Returns 0 if permission is granted.
1903 int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
1904 const struct path *new_dir, struct dentry *new_dentry,
1907 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
1908 (d_is_positive(new_dentry) &&
1909 IS_PRIVATE(d_backing_inode(new_dentry)))))
1912 return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir,
1915 EXPORT_SYMBOL(security_path_rename);
1918 * security_path_truncate() - Check if truncating a file is allowed
1921 * Check permission before truncating the file indicated by path. Note that
1922 * truncation permissions may also be checked based on already opened files,
1923 * using the security_file_truncate() hook.
1925 * Return: Returns 0 if permission is granted.
1927 int security_path_truncate(const struct path *path)
1929 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1931 return call_int_hook(path_truncate, 0, path);
1935 * security_path_chmod() - Check if changing the file's mode is allowed
1939 * Check for permission to change a mode of the file @path. The new mode is
1940 * specified in @mode which is a bitmask of constants from
1941 * <include/uapi/linux/stat.h>.
1943 * Return: Returns 0 if permission is granted.
1945 int security_path_chmod(const struct path *path, umode_t mode)
1947 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1949 return call_int_hook(path_chmod, 0, path, mode);
1953 * security_path_chown() - Check if changing the file's owner/group is allowed
1958 * Check for permission to change owner/group of a file or directory.
1960 * Return: Returns 0 if permission is granted.
1962 int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
1964 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1966 return call_int_hook(path_chown, 0, path, uid, gid);
1970 * security_path_chroot() - Check if changing the root directory is allowed
1973 * Check for permission to change root directory.
1975 * Return: Returns 0 if permission is granted.
1977 int security_path_chroot(const struct path *path)
1979 return call_int_hook(path_chroot, 0, path);
1981 #endif /* CONFIG_SECURITY_PATH */
1984 * security_inode_create() - Check if creating a file is allowed
1985 * @dir: the parent directory
1986 * @dentry: the file being created
1987 * @mode: requested file mode
1989 * Check permission to create a regular file.
1991 * Return: Returns 0 if permission is granted.
1993 int security_inode_create(struct inode *dir, struct dentry *dentry,
1996 if (unlikely(IS_PRIVATE(dir)))
1998 return call_int_hook(inode_create, 0, dir, dentry, mode);
2000 EXPORT_SYMBOL_GPL(security_inode_create);
2003 * security_inode_link() - Check if creating a hard link is allowed
2004 * @old_dentry: existing file
2005 * @dir: new parent directory
2006 * @new_dentry: new link
2008 * Check permission before creating a new hard link to a file.
2010 * Return: Returns 0 if permission is granted.
2012 int security_inode_link(struct dentry *old_dentry, struct inode *dir,
2013 struct dentry *new_dentry)
2015 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
2017 return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry);
2021 * security_inode_unlink() - Check if removing a hard link is allowed
2022 * @dir: parent directory
2025 * Check the permission to remove a hard link to a file.
2027 * Return: Returns 0 if permission is granted.
2029 int security_inode_unlink(struct inode *dir, struct dentry *dentry)
2031 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2033 return call_int_hook(inode_unlink, 0, dir, dentry);
2037 * security_inode_symlink() - Check if creating a symbolic link is allowed
2038 * @dir: parent directory
2039 * @dentry: symbolic link
2040 * @old_name: existing filename
2042 * Check the permission to create a symbolic link to a file.
2044 * Return: Returns 0 if permission is granted.
2046 int security_inode_symlink(struct inode *dir, struct dentry *dentry,
2047 const char *old_name)
2049 if (unlikely(IS_PRIVATE(dir)))
2051 return call_int_hook(inode_symlink, 0, dir, dentry, old_name);
2055 * security_inode_mkdir() - Check if creation a new director is allowed
2056 * @dir: parent directory
2057 * @dentry: new directory
2058 * @mode: new directory mode
2060 * Check permissions to create a new directory in the existing directory
2061 * associated with inode structure @dir.
2063 * Return: Returns 0 if permission is granted.
2065 int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
2067 if (unlikely(IS_PRIVATE(dir)))
2069 return call_int_hook(inode_mkdir, 0, dir, dentry, mode);
2071 EXPORT_SYMBOL_GPL(security_inode_mkdir);
2074 * security_inode_rmdir() - Check if removing a directory is allowed
2075 * @dir: parent directory
2076 * @dentry: directory to be removed
2078 * Check the permission to remove a directory.
2080 * Return: Returns 0 if permission is granted.
2082 int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
2084 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2086 return call_int_hook(inode_rmdir, 0, dir, dentry);
2090 * security_inode_mknod() - Check if creating a special file is allowed
2091 * @dir: parent directory
2093 * @mode: new file mode
2094 * @dev: device number
2096 * Check permissions when creating a special file (or a socket or a fifo file
2097 * created via the mknod system call). Note that if mknod operation is being
2098 * done for a regular file, then the create hook will be called and not this
2101 * Return: Returns 0 if permission is granted.
2103 int security_inode_mknod(struct inode *dir, struct dentry *dentry,
2104 umode_t mode, dev_t dev)
2106 if (unlikely(IS_PRIVATE(dir)))
2108 return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev);
2112 * security_inode_rename() - Check if renaming a file is allowed
2113 * @old_dir: parent directory of the old file
2114 * @old_dentry: the old file
2115 * @new_dir: parent directory of the new file
2116 * @new_dentry: the new file
2119 * Check for permission to rename a file or directory.
2121 * Return: Returns 0 if permission is granted.
2123 int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
2124 struct inode *new_dir, struct dentry *new_dentry,
2127 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
2128 (d_is_positive(new_dentry) &&
2129 IS_PRIVATE(d_backing_inode(new_dentry)))))
2132 if (flags & RENAME_EXCHANGE) {
2133 int err = call_int_hook(inode_rename, 0, new_dir, new_dentry,
2134 old_dir, old_dentry);
2139 return call_int_hook(inode_rename, 0, old_dir, old_dentry,
2140 new_dir, new_dentry);
2144 * security_inode_readlink() - Check if reading a symbolic link is allowed
2147 * Check the permission to read the symbolic link.
2149 * Return: Returns 0 if permission is granted.
2151 int security_inode_readlink(struct dentry *dentry)
2153 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2155 return call_int_hook(inode_readlink, 0, dentry);
2159 * security_inode_follow_link() - Check if following a symbolic link is allowed
2160 * @dentry: link dentry
2161 * @inode: link inode
2162 * @rcu: true if in RCU-walk mode
2164 * Check permission to follow a symbolic link when looking up a pathname. If
2165 * @rcu is true, @inode is not stable.
2167 * Return: Returns 0 if permission is granted.
2169 int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
2172 if (unlikely(IS_PRIVATE(inode)))
2174 return call_int_hook(inode_follow_link, 0, dentry, inode, rcu);
2178 * security_inode_permission() - Check if accessing an inode is allowed
2180 * @mask: access mask
2182 * Check permission before accessing an inode. This hook is called by the
2183 * existing Linux permission function, so a security module can use it to
2184 * provide additional checking for existing Linux permission checks. Notice
2185 * that this hook is called when a file is opened (as well as many other
2186 * operations), whereas the file_security_ops permission hook is called when
2187 * the actual read/write operations are performed.
2189 * Return: Returns 0 if permission is granted.
2191 int security_inode_permission(struct inode *inode, int mask)
2193 if (unlikely(IS_PRIVATE(inode)))
2195 return call_int_hook(inode_permission, 0, inode, mask);
2199 * security_inode_setattr() - Check if setting file attributes is allowed
2200 * @idmap: idmap of the mount
2202 * @attr: new attributes
2204 * Check permission before setting file attributes. Note that the kernel call
2205 * to notify_change is performed from several locations, whenever file
2206 * attributes change (such as when a file is truncated, chown/chmod operations,
2207 * transferring disk quotas, etc).
2209 * Return: Returns 0 if permission is granted.
2211 int security_inode_setattr(struct mnt_idmap *idmap,
2212 struct dentry *dentry, struct iattr *attr)
2216 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2218 ret = call_int_hook(inode_setattr, 0, dentry, attr);
2221 return evm_inode_setattr(idmap, dentry, attr);
2223 EXPORT_SYMBOL_GPL(security_inode_setattr);
2226 * security_inode_getattr() - Check if getting file attributes is allowed
2229 * Check permission before obtaining file attributes.
2231 * Return: Returns 0 if permission is granted.
2233 int security_inode_getattr(const struct path *path)
2235 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
2237 return call_int_hook(inode_getattr, 0, path);
2241 * security_inode_setxattr() - Check if setting file xattrs is allowed
2242 * @idmap: idmap of the mount
2245 * @value: xattr value
2246 * @size: size of xattr value
2249 * Check permission before setting the extended attributes.
2251 * Return: Returns 0 if permission is granted.
2253 int security_inode_setxattr(struct mnt_idmap *idmap,
2254 struct dentry *dentry, const char *name,
2255 const void *value, size_t size, int flags)
2259 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2262 * SELinux and Smack integrate the cap call,
2263 * so assume that all LSMs supplying this call do so.
2265 ret = call_int_hook(inode_setxattr, 1, idmap, dentry, name, value,
2269 ret = cap_inode_setxattr(dentry, name, value, size, flags);
2272 ret = ima_inode_setxattr(dentry, name, value, size);
2275 return evm_inode_setxattr(idmap, dentry, name, value, size);
2279 * security_inode_set_acl() - Check if setting posix acls is allowed
2280 * @idmap: idmap of the mount
2282 * @acl_name: acl name
2285 * Check permission before setting posix acls, the posix acls in @kacl are
2286 * identified by @acl_name.
2288 * Return: Returns 0 if permission is granted.
2290 int security_inode_set_acl(struct mnt_idmap *idmap,
2291 struct dentry *dentry, const char *acl_name,
2292 struct posix_acl *kacl)
2296 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2298 ret = call_int_hook(inode_set_acl, 0, idmap, dentry, acl_name,
2302 ret = ima_inode_set_acl(idmap, dentry, acl_name, kacl);
2305 return evm_inode_set_acl(idmap, dentry, acl_name, kacl);
2309 * security_inode_get_acl() - Check if reading posix acls is allowed
2310 * @idmap: idmap of the mount
2312 * @acl_name: acl name
2314 * Check permission before getting osix acls, the posix acls are identified by
2317 * Return: Returns 0 if permission is granted.
2319 int security_inode_get_acl(struct mnt_idmap *idmap,
2320 struct dentry *dentry, const char *acl_name)
2322 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2324 return call_int_hook(inode_get_acl, 0, idmap, dentry, acl_name);
2328 * security_inode_remove_acl() - Check if removing a posix acl is allowed
2329 * @idmap: idmap of the mount
2331 * @acl_name: acl name
2333 * Check permission before removing posix acls, the posix acls are identified
2336 * Return: Returns 0 if permission is granted.
2338 int security_inode_remove_acl(struct mnt_idmap *idmap,
2339 struct dentry *dentry, const char *acl_name)
2343 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2345 ret = call_int_hook(inode_remove_acl, 0, idmap, dentry, acl_name);
2348 ret = ima_inode_remove_acl(idmap, dentry, acl_name);
2351 return evm_inode_remove_acl(idmap, dentry, acl_name);
2355 * security_inode_post_setxattr() - Update the inode after a setxattr operation
2358 * @value: xattr value
2359 * @size: xattr value size
2362 * Update inode security field after successful setxattr operation.
2364 void security_inode_post_setxattr(struct dentry *dentry, const char *name,
2365 const void *value, size_t size, int flags)
2367 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2369 call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
2370 evm_inode_post_setxattr(dentry, name, value, size);
2374 * security_inode_getxattr() - Check if xattr access is allowed
2378 * Check permission before obtaining the extended attributes identified by
2379 * @name for @dentry.
2381 * Return: Returns 0 if permission is granted.
2383 int security_inode_getxattr(struct dentry *dentry, const char *name)
2385 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2387 return call_int_hook(inode_getxattr, 0, dentry, name);
2391 * security_inode_listxattr() - Check if listing xattrs is allowed
2394 * Check permission before obtaining the list of extended attribute names for
2397 * Return: Returns 0 if permission is granted.
2399 int security_inode_listxattr(struct dentry *dentry)
2401 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2403 return call_int_hook(inode_listxattr, 0, dentry);
2407 * security_inode_removexattr() - Check if removing an xattr is allowed
2408 * @idmap: idmap of the mount
2412 * Check permission before removing the extended attribute identified by @name
2415 * Return: Returns 0 if permission is granted.
2417 int security_inode_removexattr(struct mnt_idmap *idmap,
2418 struct dentry *dentry, const char *name)
2422 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2425 * SELinux and Smack integrate the cap call,
2426 * so assume that all LSMs supplying this call do so.
2428 ret = call_int_hook(inode_removexattr, 1, idmap, dentry, name);
2430 ret = cap_inode_removexattr(idmap, dentry, name);
2433 ret = ima_inode_removexattr(dentry, name);
2436 return evm_inode_removexattr(idmap, dentry, name);
2440 * security_inode_need_killpriv() - Check if security_inode_killpriv() required
2441 * @dentry: associated dentry
2443 * Called when an inode has been changed to determine if
2444 * security_inode_killpriv() should be called.
2446 * Return: Return <0 on error to abort the inode change operation, return 0 if
2447 * security_inode_killpriv() does not need to be called, return >0 if
2448 * security_inode_killpriv() does need to be called.
2450 int security_inode_need_killpriv(struct dentry *dentry)
2452 return call_int_hook(inode_need_killpriv, 0, dentry);
2456 * security_inode_killpriv() - The setuid bit is removed, update LSM state
2457 * @idmap: idmap of the mount
2458 * @dentry: associated dentry
2460 * The @dentry's setuid bit is being removed. Remove similar security labels.
2461 * Called with the dentry->d_inode->i_mutex held.
2463 * Return: Return 0 on success. If error is returned, then the operation
2464 * causing setuid bit removal is failed.
2466 int security_inode_killpriv(struct mnt_idmap *idmap,
2467 struct dentry *dentry)
2469 return call_int_hook(inode_killpriv, 0, idmap, dentry);
2473 * security_inode_getsecurity() - Get the xattr security label of an inode
2474 * @idmap: idmap of the mount
2477 * @buffer: security label buffer
2478 * @alloc: allocation flag
2480 * Retrieve a copy of the extended attribute representation of the security
2481 * label associated with @name for @inode via @buffer. Note that @name is the
2482 * remainder of the attribute name after the security prefix has been removed.
2483 * @alloc is used to specify if the call should return a value via the buffer
2484 * or just the value length.
2486 * Return: Returns size of buffer on success.
2488 int security_inode_getsecurity(struct mnt_idmap *idmap,
2489 struct inode *inode, const char *name,
2490 void **buffer, bool alloc)
2492 struct security_hook_list *hp;
2495 if (unlikely(IS_PRIVATE(inode)))
2496 return LSM_RET_DEFAULT(inode_getsecurity);
2498 * Only one module will provide an attribute with a given name.
2500 hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
2501 rc = hp->hook.inode_getsecurity(idmap, inode, name, buffer,
2503 if (rc != LSM_RET_DEFAULT(inode_getsecurity))
2506 return LSM_RET_DEFAULT(inode_getsecurity);
2510 * security_inode_setsecurity() - Set the xattr security label of an inode
2513 * @value: security label
2514 * @size: length of security label
2517 * Set the security label associated with @name for @inode from the extended
2518 * attribute value @value. @size indicates the size of the @value in bytes.
2519 * @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
2520 * remainder of the attribute name after the security. prefix has been removed.
2522 * Return: Returns 0 on success.
2524 int security_inode_setsecurity(struct inode *inode, const char *name,
2525 const void *value, size_t size, int flags)
2527 struct security_hook_list *hp;
2530 if (unlikely(IS_PRIVATE(inode)))
2531 return LSM_RET_DEFAULT(inode_setsecurity);
2533 * Only one module will provide an attribute with a given name.
2535 hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
2536 rc = hp->hook.inode_setsecurity(inode, name, value, size,
2538 if (rc != LSM_RET_DEFAULT(inode_setsecurity))
2541 return LSM_RET_DEFAULT(inode_setsecurity);
2545 * security_inode_listsecurity() - List the xattr security label names
2548 * @buffer_size: size of buffer
2550 * Copy the extended attribute names for the security labels associated with
2551 * @inode into @buffer. The maximum size of @buffer is specified by
2552 * @buffer_size. @buffer may be NULL to request the size of the buffer
2555 * Return: Returns number of bytes used/required on success.
2557 int security_inode_listsecurity(struct inode *inode,
2558 char *buffer, size_t buffer_size)
2560 if (unlikely(IS_PRIVATE(inode)))
2562 return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size);
2564 EXPORT_SYMBOL(security_inode_listsecurity);
2567 * security_inode_getsecid() - Get an inode's secid
2569 * @secid: secid to return
2571 * Get the secid associated with the node. In case of failure, @secid will be
2574 void security_inode_getsecid(struct inode *inode, u32 *secid)
2576 call_void_hook(inode_getsecid, inode, secid);
2580 * security_inode_copy_up() - Create new creds for an overlayfs copy-up op
2581 * @src: union dentry of copy-up file
2582 * @new: newly created creds
2584 * A file is about to be copied up from lower layer to upper layer of overlay
2585 * filesystem. Security module can prepare a set of new creds and modify as
2586 * need be and return new creds. Caller will switch to new creds temporarily to
2587 * create new file and release newly allocated creds.
2589 * Return: Returns 0 on success or a negative error code on error.
2591 int security_inode_copy_up(struct dentry *src, struct cred **new)
2593 return call_int_hook(inode_copy_up, 0, src, new);
2595 EXPORT_SYMBOL(security_inode_copy_up);
2598 * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
2601 * Filter the xattrs being copied up when a unioned file is copied up from a
2602 * lower layer to the union/overlay layer. The caller is responsible for
2603 * reading and writing the xattrs, this hook is merely a filter.
2605 * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
2606 * if the security module does not know about attribute, or a negative
2607 * error code to abort the copy up.
2609 int security_inode_copy_up_xattr(const char *name)
2611 struct security_hook_list *hp;
2615 * The implementation can return 0 (accept the xattr), 1 (discard the
2616 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
2617 * any other error code in case of an error.
2619 hlist_for_each_entry(hp,
2620 &security_hook_heads.inode_copy_up_xattr, list) {
2621 rc = hp->hook.inode_copy_up_xattr(name);
2622 if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
2626 return evm_inode_copy_up_xattr(name);
2628 EXPORT_SYMBOL(security_inode_copy_up_xattr);
2631 * security_kernfs_init_security() - Init LSM context for a kernfs node
2632 * @kn_dir: parent kernfs node
2633 * @kn: the kernfs node to initialize
2635 * Initialize the security context of a newly created kernfs node based on its
2636 * own and its parent's attributes.
2638 * Return: Returns 0 if permission is granted.
2640 int security_kernfs_init_security(struct kernfs_node *kn_dir,
2641 struct kernfs_node *kn)
2643 return call_int_hook(kernfs_init_security, 0, kn_dir, kn);
2647 * security_file_permission() - Check file permissions
2649 * @mask: requested permissions
2651 * Check file permissions before accessing an open file. This hook is called
2652 * by various operations that read or write files. A security module can use
2653 * this hook to perform additional checking on these operations, e.g. to
2654 * revalidate permissions on use to support privilege bracketing or policy
2655 * changes. Notice that this hook is used when the actual read/write
2656 * operations are performed, whereas the inode_security_ops hook is called when
2657 * a file is opened (as well as many other operations). Although this hook can
2658 * be used to revalidate permissions for various system call operations that
2659 * read or write files, it does not address the revalidation of permissions for
2660 * memory-mapped files. Security modules must handle this separately if they
2661 * need such revalidation.
2663 * Return: Returns 0 if permission is granted.
2665 int security_file_permission(struct file *file, int mask)
2667 return call_int_hook(file_permission, 0, file, mask);
2671 * security_file_alloc() - Allocate and init a file's LSM blob
2674 * Allocate and attach a security structure to the file->f_security field. The
2675 * security field is initialized to NULL when the structure is first created.
2677 * Return: Return 0 if the hook is successful and permission is granted.
2679 int security_file_alloc(struct file *file)
2681 int rc = lsm_file_alloc(file);
2685 rc = call_int_hook(file_alloc_security, 0, file);
2687 security_file_free(file);
2692 * security_file_free() - Free a file's LSM blob
2695 * Deallocate and free any security structures stored in file->f_security.
2697 void security_file_free(struct file *file)
2701 call_void_hook(file_free_security, file);
2703 blob = file->f_security;
2705 file->f_security = NULL;
2706 kmem_cache_free(lsm_file_cache, blob);
2711 * security_file_ioctl() - Check if an ioctl is allowed
2712 * @file: associated file
2714 * @arg: ioctl arguments
2716 * Check permission for an ioctl operation on @file. Note that @arg sometimes
2717 * represents a user space pointer; in other cases, it may be a simple integer
2718 * value. When @arg represents a user space pointer, it should never be used
2719 * by the security module.
2721 * Return: Returns 0 if permission is granted.
2723 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2725 return call_int_hook(file_ioctl, 0, file, cmd, arg);
2727 EXPORT_SYMBOL_GPL(security_file_ioctl);
2730 * security_file_ioctl_compat() - Check if an ioctl is allowed in compat mode
2731 * @file: associated file
2733 * @arg: ioctl arguments
2735 * Compat version of security_file_ioctl() that correctly handles 32-bit
2736 * processes running on 64-bit kernels.
2738 * Return: Returns 0 if permission is granted.
2740 int security_file_ioctl_compat(struct file *file, unsigned int cmd,
2743 return call_int_hook(file_ioctl_compat, 0, file, cmd, arg);
2745 EXPORT_SYMBOL_GPL(security_file_ioctl_compat);
2747 static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
2750 * Does we have PROT_READ and does the application expect
2751 * it to imply PROT_EXEC? If not, nothing to talk about...
2753 if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
2755 if (!(current->personality & READ_IMPLIES_EXEC))
2758 * if that's an anonymous mapping, let it.
2761 return prot | PROT_EXEC;
2763 * ditto if it's not on noexec mount, except that on !MMU we need
2764 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
2766 if (!path_noexec(&file->f_path)) {
2768 if (file->f_op->mmap_capabilities) {
2769 unsigned caps = file->f_op->mmap_capabilities(file);
2770 if (!(caps & NOMMU_MAP_EXEC))
2774 return prot | PROT_EXEC;
2776 /* anything on noexec mount won't get PROT_EXEC */
2781 * security_mmap_file() - Check if mmap'ing a file is allowed
2783 * @prot: protection applied by the kernel
2786 * Check permissions for a mmap operation. The @file may be NULL, e.g. if
2787 * mapping anonymous memory.
2789 * Return: Returns 0 if permission is granted.
2791 int security_mmap_file(struct file *file, unsigned long prot,
2792 unsigned long flags)
2794 unsigned long prot_adj = mmap_prot(file, prot);
2797 ret = call_int_hook(mmap_file, 0, file, prot, prot_adj, flags);
2800 return ima_file_mmap(file, prot, prot_adj, flags);
2804 * security_mmap_addr() - Check if mmap'ing an address is allowed
2807 * Check permissions for a mmap operation at @addr.
2809 * Return: Returns 0 if permission is granted.
2811 int security_mmap_addr(unsigned long addr)
2813 return call_int_hook(mmap_addr, 0, addr);
2817 * security_file_mprotect() - Check if changing memory protections is allowed
2818 * @vma: memory region
2819 * @reqprot: application requested protection
2820 * @prot: protection applied by the kernel
2822 * Check permissions before changing memory access permissions.
2824 * Return: Returns 0 if permission is granted.
2826 int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
2831 ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot);
2834 return ima_file_mprotect(vma, prot);
2838 * security_file_lock() - Check if a file lock is allowed
2840 * @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
2842 * Check permission before performing file locking operations. Note the hook
2843 * mediates both flock and fcntl style locks.
2845 * Return: Returns 0 if permission is granted.
2847 int security_file_lock(struct file *file, unsigned int cmd)
2849 return call_int_hook(file_lock, 0, file, cmd);
2853 * security_file_fcntl() - Check if fcntl() op is allowed
2855 * @cmd: fcntl command
2856 * @arg: command argument
2858 * Check permission before allowing the file operation specified by @cmd from
2859 * being performed on the file @file. Note that @arg sometimes represents a
2860 * user space pointer; in other cases, it may be a simple integer value. When
2861 * @arg represents a user space pointer, it should never be used by the
2864 * Return: Returns 0 if permission is granted.
2866 int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
2868 return call_int_hook(file_fcntl, 0, file, cmd, arg);
2872 * security_file_set_fowner() - Set the file owner info in the LSM blob
2875 * Save owner security information (typically from current->security) in
2876 * file->f_security for later use by the send_sigiotask hook.
2878 * Return: Returns 0 on success.
2880 void security_file_set_fowner(struct file *file)
2882 call_void_hook(file_set_fowner, file);
2886 * security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
2888 * @fown: signal sender
2889 * @sig: signal to be sent, SIGIO is sent if 0
2891 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
2892 * process @tsk. Note that this hook is sometimes called from interrupt. Note
2893 * that the fown_struct, @fown, is never outside the context of a struct file,
2894 * so the file structure (and associated security information) can always be
2895 * obtained: container_of(fown, struct file, f_owner).
2897 * Return: Returns 0 if permission is granted.
2899 int security_file_send_sigiotask(struct task_struct *tsk,
2900 struct fown_struct *fown, int sig)
2902 return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig);
2906 * security_file_receive() - Check is receiving a file via IPC is allowed
2907 * @file: file being received
2909 * This hook allows security modules to control the ability of a process to
2910 * receive an open file descriptor via socket IPC.
2912 * Return: Returns 0 if permission is granted.
2914 int security_file_receive(struct file *file)
2916 return call_int_hook(file_receive, 0, file);
2920 * security_file_open() - Save open() time state for late use by the LSM
2923 * Save open-time permission checking state for later use upon file_permission,
2924 * and recheck access if anything has changed since inode_permission.
2926 * Return: Returns 0 if permission is granted.
2928 int security_file_open(struct file *file)
2932 ret = call_int_hook(file_open, 0, file);
2936 return fsnotify_open_perm(file);
2940 * security_file_truncate() - Check if truncating a file is allowed
2943 * Check permission before truncating a file, i.e. using ftruncate. Note that
2944 * truncation permission may also be checked based on the path, using the
2945 * @path_truncate hook.
2947 * Return: Returns 0 if permission is granted.
2949 int security_file_truncate(struct file *file)
2951 return call_int_hook(file_truncate, 0, file);
2955 * security_task_alloc() - Allocate a task's LSM blob
2957 * @clone_flags: flags indicating what is being shared
2959 * Handle allocation of task-related resources.
2961 * Return: Returns a zero on success, negative values on failure.
2963 int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
2965 int rc = lsm_task_alloc(task);
2969 rc = call_int_hook(task_alloc, 0, task, clone_flags);
2971 security_task_free(task);
2976 * security_task_free() - Free a task's LSM blob and related resources
2979 * Handle release of task-related resources. Note that this can be called from
2980 * interrupt context.
2982 void security_task_free(struct task_struct *task)
2984 call_void_hook(task_free, task);
2986 kfree(task->security);
2987 task->security = NULL;
2991 * security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
2992 * @cred: credentials
2995 * Only allocate sufficient memory and attach to @cred such that
2996 * cred_transfer() will not get ENOMEM.
2998 * Return: Returns 0 on success, negative values on failure.
3000 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
3002 int rc = lsm_cred_alloc(cred, gfp);
3007 rc = call_int_hook(cred_alloc_blank, 0, cred, gfp);
3009 security_cred_free(cred);
3014 * security_cred_free() - Free the cred's LSM blob and associated resources
3015 * @cred: credentials
3017 * Deallocate and clear the cred->security field in a set of credentials.
3019 void security_cred_free(struct cred *cred)
3022 * There is a failure case in prepare_creds() that
3023 * may result in a call here with ->security being NULL.
3025 if (unlikely(cred->security == NULL))
3028 call_void_hook(cred_free, cred);
3030 kfree(cred->security);
3031 cred->security = NULL;
3035 * security_prepare_creds() - Prepare a new set of credentials
3036 * @new: new credentials
3037 * @old: original credentials
3040 * Prepare a new set of credentials by copying the data from the old set.
3042 * Return: Returns 0 on success, negative values on failure.
3044 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
3046 int rc = lsm_cred_alloc(new, gfp);
3051 rc = call_int_hook(cred_prepare, 0, new, old, gfp);
3053 security_cred_free(new);
3058 * security_transfer_creds() - Transfer creds
3059 * @new: target credentials
3060 * @old: original credentials
3062 * Transfer data from original creds to new creds.
3064 void security_transfer_creds(struct cred *new, const struct cred *old)
3066 call_void_hook(cred_transfer, new, old);
3070 * security_cred_getsecid() - Get the secid from a set of credentials
3072 * @secid: secid value
3074 * Retrieve the security identifier of the cred structure @c. In case of
3075 * failure, @secid will be set to zero.
3077 void security_cred_getsecid(const struct cred *c, u32 *secid)
3080 call_void_hook(cred_getsecid, c, secid);
3082 EXPORT_SYMBOL(security_cred_getsecid);
3085 * security_kernel_act_as() - Set the kernel credentials to act as secid
3089 * Set the credentials for a kernel service to act as (subjective context).
3090 * The current task must be the one that nominated @secid.
3092 * Return: Returns 0 if successful.
3094 int security_kernel_act_as(struct cred *new, u32 secid)
3096 return call_int_hook(kernel_act_as, 0, new, secid);
3100 * security_kernel_create_files_as() - Set file creation context using an inode
3101 * @new: target credentials
3102 * @inode: reference inode
3104 * Set the file creation context in a set of credentials to be the same as the
3105 * objective context of the specified inode. The current task must be the one
3106 * that nominated @inode.
3108 * Return: Returns 0 if successful.
3110 int security_kernel_create_files_as(struct cred *new, struct inode *inode)
3112 return call_int_hook(kernel_create_files_as, 0, new, inode);
3116 * security_kernel_module_request() - Check is loading a module is allowed
3117 * @kmod_name: module name
3119 * Ability to trigger the kernel to automatically upcall to userspace for
3120 * userspace to load a kernel module with the given name.
3122 * Return: Returns 0 if successful.
3124 int security_kernel_module_request(char *kmod_name)
3128 ret = call_int_hook(kernel_module_request, 0, kmod_name);
3131 return integrity_kernel_module_request(kmod_name);
3135 * security_kernel_read_file() - Read a file specified by userspace
3137 * @id: file identifier
3138 * @contents: trust if security_kernel_post_read_file() will be called
3140 * Read a file specified by userspace.
3142 * Return: Returns 0 if permission is granted.
3144 int security_kernel_read_file(struct file *file, enum kernel_read_file_id id,
3149 ret = call_int_hook(kernel_read_file, 0, file, id, contents);
3152 return ima_read_file(file, id, contents);
3154 EXPORT_SYMBOL_GPL(security_kernel_read_file);
3157 * security_kernel_post_read_file() - Read a file specified by userspace
3159 * @buf: file contents
3160 * @size: size of file contents
3161 * @id: file identifier
3163 * Read a file specified by userspace. This must be paired with a prior call
3164 * to security_kernel_read_file() call that indicated this hook would also be
3165 * called, see security_kernel_read_file() for more information.
3167 * Return: Returns 0 if permission is granted.
3169 int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
3170 enum kernel_read_file_id id)
3174 ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id);
3177 return ima_post_read_file(file, buf, size, id);
3179 EXPORT_SYMBOL_GPL(security_kernel_post_read_file);
3182 * security_kernel_load_data() - Load data provided by userspace
3183 * @id: data identifier
3184 * @contents: true if security_kernel_post_load_data() will be called
3186 * Load data provided by userspace.
3188 * Return: Returns 0 if permission is granted.
3190 int security_kernel_load_data(enum kernel_load_data_id id, bool contents)
3194 ret = call_int_hook(kernel_load_data, 0, id, contents);
3197 return ima_load_data(id, contents);
3199 EXPORT_SYMBOL_GPL(security_kernel_load_data);
3202 * security_kernel_post_load_data() - Load userspace data from a non-file source
3204 * @size: size of data
3205 * @id: data identifier
3206 * @description: text description of data, specific to the id value
3208 * Load data provided by a non-file source (usually userspace buffer). This
3209 * must be paired with a prior security_kernel_load_data() call that indicated
3210 * this hook would also be called, see security_kernel_load_data() for more
3213 * Return: Returns 0 if permission is granted.
3215 int security_kernel_post_load_data(char *buf, loff_t size,
3216 enum kernel_load_data_id id,
3221 ret = call_int_hook(kernel_post_load_data, 0, buf, size, id,
3225 return ima_post_load_data(buf, size, id, description);
3227 EXPORT_SYMBOL_GPL(security_kernel_post_load_data);
3230 * security_task_fix_setuid() - Update LSM with new user id attributes
3231 * @new: updated credentials
3232 * @old: credentials being replaced
3233 * @flags: LSM_SETID_* flag values
3235 * Update the module's state after setting one or more of the user identity
3236 * attributes of the current process. The @flags parameter indicates which of
3237 * the set*uid system calls invoked this hook. If @new is the set of
3238 * credentials that will be installed. Modifications should be made to this
3239 * rather than to @current->cred.
3241 * Return: Returns 0 on success.
3243 int security_task_fix_setuid(struct cred *new, const struct cred *old,
3246 return call_int_hook(task_fix_setuid, 0, new, old, flags);
3250 * security_task_fix_setgid() - Update LSM with new group id attributes
3251 * @new: updated credentials
3252 * @old: credentials being replaced
3253 * @flags: LSM_SETID_* flag value
3255 * Update the module's state after setting one or more of the group identity
3256 * attributes of the current process. The @flags parameter indicates which of
3257 * the set*gid system calls invoked this hook. @new is the set of credentials
3258 * that will be installed. Modifications should be made to this rather than to
3261 * Return: Returns 0 on success.
3263 int security_task_fix_setgid(struct cred *new, const struct cred *old,
3266 return call_int_hook(task_fix_setgid, 0, new, old, flags);
3270 * security_task_fix_setgroups() - Update LSM with new supplementary groups
3271 * @new: updated credentials
3272 * @old: credentials being replaced
3274 * Update the module's state after setting the supplementary group identity
3275 * attributes of the current process. @new is the set of credentials that will
3276 * be installed. Modifications should be made to this rather than to
3279 * Return: Returns 0 on success.
3281 int security_task_fix_setgroups(struct cred *new, const struct cred *old)
3283 return call_int_hook(task_fix_setgroups, 0, new, old);
3287 * security_task_setpgid() - Check if setting the pgid is allowed
3288 * @p: task being modified
3291 * Check permission before setting the process group identifier of the process
3294 * Return: Returns 0 if permission is granted.
3296 int security_task_setpgid(struct task_struct *p, pid_t pgid)
3298 return call_int_hook(task_setpgid, 0, p, pgid);
3302 * security_task_getpgid() - Check if getting the pgid is allowed
3305 * Check permission before getting the process group identifier of the process
3308 * Return: Returns 0 if permission is granted.
3310 int security_task_getpgid(struct task_struct *p)
3312 return call_int_hook(task_getpgid, 0, p);
3316 * security_task_getsid() - Check if getting the session id is allowed
3319 * Check permission before getting the session identifier of the process @p.
3321 * Return: Returns 0 if permission is granted.
3323 int security_task_getsid(struct task_struct *p)
3325 return call_int_hook(task_getsid, 0, p);
3329 * security_current_getsecid_subj() - Get the current task's subjective secid
3330 * @secid: secid value
3332 * Retrieve the subjective security identifier of the current task and return
3333 * it in @secid. In case of failure, @secid will be set to zero.
3335 void security_current_getsecid_subj(u32 *secid)
3338 call_void_hook(current_getsecid_subj, secid);
3340 EXPORT_SYMBOL(security_current_getsecid_subj);
3343 * security_task_getsecid_obj() - Get a task's objective secid
3345 * @secid: secid value
3347 * Retrieve the objective security identifier of the task_struct in @p and
3348 * return it in @secid. In case of failure, @secid will be set to zero.
3350 void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
3353 call_void_hook(task_getsecid_obj, p, secid);
3355 EXPORT_SYMBOL(security_task_getsecid_obj);
3358 * security_task_setnice() - Check if setting a task's nice value is allowed
3362 * Check permission before setting the nice value of @p to @nice.
3364 * Return: Returns 0 if permission is granted.
3366 int security_task_setnice(struct task_struct *p, int nice)
3368 return call_int_hook(task_setnice, 0, p, nice);
3372 * security_task_setioprio() - Check if setting a task's ioprio is allowed
3374 * @ioprio: ioprio value
3376 * Check permission before setting the ioprio value of @p to @ioprio.
3378 * Return: Returns 0 if permission is granted.
3380 int security_task_setioprio(struct task_struct *p, int ioprio)
3382 return call_int_hook(task_setioprio, 0, p, ioprio);
3386 * security_task_getioprio() - Check if getting a task's ioprio is allowed
3389 * Check permission before getting the ioprio value of @p.
3391 * Return: Returns 0 if permission is granted.
3393 int security_task_getioprio(struct task_struct *p)
3395 return call_int_hook(task_getioprio, 0, p);
3399 * security_task_prlimit() - Check if get/setting resources limits is allowed
3400 * @cred: current task credentials
3401 * @tcred: target task credentials
3402 * @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
3404 * Check permission before getting and/or setting the resource limits of
3407 * Return: Returns 0 if permission is granted.
3409 int security_task_prlimit(const struct cred *cred, const struct cred *tcred,
3412 return call_int_hook(task_prlimit, 0, cred, tcred, flags);
3416 * security_task_setrlimit() - Check if setting a new rlimit value is allowed
3417 * @p: target task's group leader
3418 * @resource: resource whose limit is being set
3419 * @new_rlim: new resource limit
3421 * Check permission before setting the resource limits of process @p for
3422 * @resource to @new_rlim. The old resource limit values can be examined by
3423 * dereferencing (p->signal->rlim + resource).
3425 * Return: Returns 0 if permission is granted.
3427 int security_task_setrlimit(struct task_struct *p, unsigned int resource,
3428 struct rlimit *new_rlim)
3430 return call_int_hook(task_setrlimit, 0, p, resource, new_rlim);
3434 * security_task_setscheduler() - Check if setting sched policy/param is allowed
3437 * Check permission before setting scheduling policy and/or parameters of
3440 * Return: Returns 0 if permission is granted.
3442 int security_task_setscheduler(struct task_struct *p)
3444 return call_int_hook(task_setscheduler, 0, p);
3448 * security_task_getscheduler() - Check if getting scheduling info is allowed
3451 * Check permission before obtaining scheduling information for process @p.
3453 * Return: Returns 0 if permission is granted.
3455 int security_task_getscheduler(struct task_struct *p)
3457 return call_int_hook(task_getscheduler, 0, p);
3461 * security_task_movememory() - Check if moving memory is allowed
3464 * Check permission before moving memory owned by process @p.
3466 * Return: Returns 0 if permission is granted.
3468 int security_task_movememory(struct task_struct *p)
3470 return call_int_hook(task_movememory, 0, p);
3474 * security_task_kill() - Check if sending a signal is allowed
3475 * @p: target process
3476 * @info: signal information
3477 * @sig: signal value
3478 * @cred: credentials of the signal sender, NULL if @current
3480 * Check permission before sending signal @sig to @p. @info can be NULL, the
3481 * constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
3482 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
3483 * the kernel and should typically be permitted. SIGIO signals are handled
3484 * separately by the send_sigiotask hook in file_security_ops.
3486 * Return: Returns 0 if permission is granted.
3488 int security_task_kill(struct task_struct *p, struct kernel_siginfo *info,
3489 int sig, const struct cred *cred)
3491 return call_int_hook(task_kill, 0, p, info, sig, cred);
3495 * security_task_prctl() - Check if a prctl op is allowed
3496 * @option: operation
3502 * Check permission before performing a process control operation on the
3505 * Return: Return -ENOSYS if no-one wanted to handle this op, any other value
3506 * to cause prctl() to return immediately with that value.
3508 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
3509 unsigned long arg4, unsigned long arg5)
3512 int rc = LSM_RET_DEFAULT(task_prctl);
3513 struct security_hook_list *hp;
3515 hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
3516 thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
3517 if (thisrc != LSM_RET_DEFAULT(task_prctl)) {
3527 * security_task_to_inode() - Set the security attributes of a task's inode
3531 * Set the security attributes for an inode based on an associated task's
3532 * security attributes, e.g. for /proc/pid inodes.
3534 void security_task_to_inode(struct task_struct *p, struct inode *inode)
3536 call_void_hook(task_to_inode, p, inode);
3540 * security_create_user_ns() - Check if creating a new userns is allowed
3541 * @cred: prepared creds
3543 * Check permission prior to creating a new user namespace.
3545 * Return: Returns 0 if successful, otherwise < 0 error code.
3547 int security_create_user_ns(const struct cred *cred)
3549 return call_int_hook(userns_create, 0, cred);
3553 * security_ipc_permission() - Check if sysv ipc access is allowed
3554 * @ipcp: ipc permission structure
3555 * @flag: requested permissions
3557 * Check permissions for access to IPC.
3559 * Return: Returns 0 if permission is granted.
3561 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
3563 return call_int_hook(ipc_permission, 0, ipcp, flag);
3567 * security_ipc_getsecid() - Get the sysv ipc object's secid
3568 * @ipcp: ipc permission structure
3569 * @secid: secid pointer
3571 * Get the secid associated with the ipc object. In case of failure, @secid
3572 * will be set to zero.
3574 void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
3577 call_void_hook(ipc_getsecid, ipcp, secid);
3581 * security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
3582 * @msg: message structure
3584 * Allocate and attach a security structure to the msg->security field. The
3585 * security field is initialized to NULL when the structure is first created.
3587 * Return: Return 0 if operation was successful and permission is granted.
3589 int security_msg_msg_alloc(struct msg_msg *msg)
3591 int rc = lsm_msg_msg_alloc(msg);
3595 rc = call_int_hook(msg_msg_alloc_security, 0, msg);
3597 security_msg_msg_free(msg);
3602 * security_msg_msg_free() - Free a sysv ipc message LSM blob
3603 * @msg: message structure
3605 * Deallocate the security structure for this message.
3607 void security_msg_msg_free(struct msg_msg *msg)
3609 call_void_hook(msg_msg_free_security, msg);
3610 kfree(msg->security);
3611 msg->security = NULL;
3615 * security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
3616 * @msq: sysv ipc permission structure
3618 * Allocate and attach a security structure to @msg. The security field is
3619 * initialized to NULL when the structure is first created.
3621 * Return: Returns 0 if operation was successful and permission is granted.
3623 int security_msg_queue_alloc(struct kern_ipc_perm *msq)
3625 int rc = lsm_ipc_alloc(msq);
3629 rc = call_int_hook(msg_queue_alloc_security, 0, msq);
3631 security_msg_queue_free(msq);
3636 * security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
3637 * @msq: sysv ipc permission structure
3639 * Deallocate security field @perm->security for the message queue.
3641 void security_msg_queue_free(struct kern_ipc_perm *msq)
3643 call_void_hook(msg_queue_free_security, msq);
3644 kfree(msq->security);
3645 msq->security = NULL;
3649 * security_msg_queue_associate() - Check if a msg queue operation is allowed
3650 * @msq: sysv ipc permission structure
3651 * @msqflg: operation flags
3653 * Check permission when a message queue is requested through the msgget system
3654 * call. This hook is only called when returning the message queue identifier
3655 * for an existing message queue, not when a new message queue is created.
3657 * Return: Return 0 if permission is granted.
3659 int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
3661 return call_int_hook(msg_queue_associate, 0, msq, msqflg);
3665 * security_msg_queue_msgctl() - Check if a msg queue operation is allowed
3666 * @msq: sysv ipc permission structure
3669 * Check permission when a message control operation specified by @cmd is to be
3670 * performed on the message queue with permissions.
3672 * Return: Returns 0 if permission is granted.
3674 int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
3676 return call_int_hook(msg_queue_msgctl, 0, msq, cmd);
3680 * security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
3681 * @msq: sysv ipc permission structure
3683 * @msqflg: operation flags
3685 * Check permission before a message, @msg, is enqueued on the message queue
3686 * with permissions specified in @msq.
3688 * Return: Returns 0 if permission is granted.
3690 int security_msg_queue_msgsnd(struct kern_ipc_perm *msq,
3691 struct msg_msg *msg, int msqflg)
3693 return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg);
3697 * security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
3698 * @msq: sysv ipc permission structure
3700 * @target: target task
3701 * @type: type of message requested
3702 * @mode: operation flags
3704 * Check permission before a message, @msg, is removed from the message queue.
3705 * The @target task structure contains a pointer to the process that will be
3706 * receiving the message (not equal to the current process when inline receives
3707 * are being performed).
3709 * Return: Returns 0 if permission is granted.
3711 int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
3712 struct task_struct *target, long type, int mode)
3714 return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode);
3718 * security_shm_alloc() - Allocate a sysv shm LSM blob
3719 * @shp: sysv ipc permission structure
3721 * Allocate and attach a security structure to the @shp security field. The
3722 * security field is initialized to NULL when the structure is first created.
3724 * Return: Returns 0 if operation was successful and permission is granted.
3726 int security_shm_alloc(struct kern_ipc_perm *shp)
3728 int rc = lsm_ipc_alloc(shp);
3732 rc = call_int_hook(shm_alloc_security, 0, shp);
3734 security_shm_free(shp);
3739 * security_shm_free() - Free a sysv shm LSM blob
3740 * @shp: sysv ipc permission structure
3742 * Deallocate the security structure @perm->security for the memory segment.
3744 void security_shm_free(struct kern_ipc_perm *shp)
3746 call_void_hook(shm_free_security, shp);
3747 kfree(shp->security);
3748 shp->security = NULL;
3752 * security_shm_associate() - Check if a sysv shm operation is allowed
3753 * @shp: sysv ipc permission structure
3754 * @shmflg: operation flags
3756 * Check permission when a shared memory region is requested through the shmget
3757 * system call. This hook is only called when returning the shared memory
3758 * region identifier for an existing region, not when a new shared memory
3759 * region is created.
3761 * Return: Returns 0 if permission is granted.
3763 int security_shm_associate(struct kern_ipc_perm *shp, int shmflg)
3765 return call_int_hook(shm_associate, 0, shp, shmflg);
3769 * security_shm_shmctl() - Check if a sysv shm operation is allowed
3770 * @shp: sysv ipc permission structure
3773 * Check permission when a shared memory control operation specified by @cmd is
3774 * to be performed on the shared memory region with permissions in @shp.
3776 * Return: Return 0 if permission is granted.
3778 int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
3780 return call_int_hook(shm_shmctl, 0, shp, cmd);
3784 * security_shm_shmat() - Check if a sysv shm attach operation is allowed
3785 * @shp: sysv ipc permission structure
3786 * @shmaddr: address of memory region to attach
3787 * @shmflg: operation flags
3789 * Check permissions prior to allowing the shmat system call to attach the
3790 * shared memory segment with permissions @shp to the data segment of the
3791 * calling process. The attaching address is specified by @shmaddr.
3793 * Return: Returns 0 if permission is granted.
3795 int security_shm_shmat(struct kern_ipc_perm *shp,
3796 char __user *shmaddr, int shmflg)
3798 return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg);
3802 * security_sem_alloc() - Allocate a sysv semaphore LSM blob
3803 * @sma: sysv ipc permission structure
3805 * Allocate and attach a security structure to the @sma security field. The
3806 * security field is initialized to NULL when the structure is first created.
3808 * Return: Returns 0 if operation was successful and permission is granted.
3810 int security_sem_alloc(struct kern_ipc_perm *sma)
3812 int rc = lsm_ipc_alloc(sma);
3816 rc = call_int_hook(sem_alloc_security, 0, sma);
3818 security_sem_free(sma);
3823 * security_sem_free() - Free a sysv semaphore LSM blob
3824 * @sma: sysv ipc permission structure
3826 * Deallocate security structure @sma->security for the semaphore.
3828 void security_sem_free(struct kern_ipc_perm *sma)
3830 call_void_hook(sem_free_security, sma);
3831 kfree(sma->security);
3832 sma->security = NULL;
3836 * security_sem_associate() - Check if a sysv semaphore operation is allowed
3837 * @sma: sysv ipc permission structure
3838 * @semflg: operation flags
3840 * Check permission when a semaphore is requested through the semget system
3841 * call. This hook is only called when returning the semaphore identifier for
3842 * an existing semaphore, not when a new one must be created.
3844 * Return: Returns 0 if permission is granted.
3846 int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
3848 return call_int_hook(sem_associate, 0, sma, semflg);
3852 * security_sem_semctl() - Check if a sysv semaphore operation is allowed
3853 * @sma: sysv ipc permission structure
3856 * Check permission when a semaphore operation specified by @cmd is to be
3857 * performed on the semaphore.
3859 * Return: Returns 0 if permission is granted.
3861 int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
3863 return call_int_hook(sem_semctl, 0, sma, cmd);
3867 * security_sem_semop() - Check if a sysv semaphore operation is allowed
3868 * @sma: sysv ipc permission structure
3869 * @sops: operations to perform
3870 * @nsops: number of operations
3871 * @alter: flag indicating changes will be made
3873 * Check permissions before performing operations on members of the semaphore
3874 * set. If the @alter flag is nonzero, the semaphore set may be modified.
3876 * Return: Returns 0 if permission is granted.
3878 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
3879 unsigned nsops, int alter)
3881 return call_int_hook(sem_semop, 0, sma, sops, nsops, alter);
3885 * security_d_instantiate() - Populate an inode's LSM state based on a dentry
3889 * Fill in @inode security information for a @dentry if allowed.
3891 void security_d_instantiate(struct dentry *dentry, struct inode *inode)
3893 if (unlikely(inode && IS_PRIVATE(inode)))
3895 call_void_hook(d_instantiate, dentry, inode);
3897 EXPORT_SYMBOL(security_d_instantiate);
3900 * Please keep this in sync with it's counterpart in security/lsm_syscalls.c
3904 * security_getselfattr - Read an LSM attribute of the current process.
3905 * @attr: which attribute to return
3906 * @uctx: the user-space destination for the information, or NULL
3907 * @size: pointer to the size of space available to receive the data
3908 * @flags: special handling options. LSM_FLAG_SINGLE indicates that only
3909 * attributes associated with the LSM identified in the passed @ctx be
3912 * A NULL value for @uctx can be used to get both the number of attributes
3913 * and the size of the data.
3915 * Returns the number of attributes found on success, negative value
3916 * on error. @size is reset to the total size of the data.
3917 * If @size is insufficient to contain the data -E2BIG is returned.
3919 int security_getselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
3920 size_t __user *size, u32 flags)
3922 struct security_hook_list *hp;
3923 struct lsm_ctx lctx = { .id = LSM_ID_UNDEF, };
3924 u8 __user *base = (u8 __user *)uctx;
3928 bool toobig = false;
3929 bool single = false;
3933 if (attr == LSM_ATTR_UNDEF)
3937 if (get_user(left, size))
3942 * Only flag supported is LSM_FLAG_SINGLE
3944 if (flags != LSM_FLAG_SINGLE || !uctx)
3946 if (copy_from_user(&lctx, uctx, sizeof(lctx)))
3949 * If the LSM ID isn't specified it is an error.
3951 if (lctx.id == LSM_ID_UNDEF)
3957 * In the usual case gather all the data from the LSMs.
3958 * In the single case only get the data from the LSM specified.
3960 hlist_for_each_entry(hp, &security_hook_heads.getselfattr, list) {
3961 if (single && lctx.id != hp->lsmid->id)
3965 uctx = (struct lsm_ctx __user *)(base + total);
3966 rc = hp->hook.getselfattr(attr, uctx, &entrysize, flags);
3967 if (rc == -EOPNOTSUPP) {
3985 if (put_user(total, size))
3990 return LSM_RET_DEFAULT(getselfattr);
3995 * Please keep this in sync with it's counterpart in security/lsm_syscalls.c
3999 * security_setselfattr - Set an LSM attribute on the current process.
4000 * @attr: which attribute to set
4001 * @uctx: the user-space source for the information
4002 * @size: the size of the data
4003 * @flags: reserved for future use, must be 0
4005 * Set an LSM attribute for the current process. The LSM, attribute
4006 * and new value are included in @uctx.
4008 * Returns 0 on success, -EINVAL if the input is inconsistent, -EFAULT
4009 * if the user buffer is inaccessible, E2BIG if size is too big, or an
4010 * LSM specific failure.
4012 int security_setselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
4013 size_t size, u32 flags)
4015 struct security_hook_list *hp;
4016 struct lsm_ctx *lctx;
4017 int rc = LSM_RET_DEFAULT(setselfattr);
4021 if (size < sizeof(*lctx))
4023 if (size > PAGE_SIZE)
4026 lctx = memdup_user(uctx, size);
4028 return PTR_ERR(lctx);
4030 if (size < lctx->len || size < lctx->ctx_len + sizeof(*lctx) ||
4031 lctx->len < lctx->ctx_len + sizeof(*lctx)) {
4036 hlist_for_each_entry(hp, &security_hook_heads.setselfattr, list)
4037 if ((hp->lsmid->id) == lctx->id) {
4038 rc = hp->hook.setselfattr(attr, lctx, size, flags);
4048 * security_getprocattr() - Read an attribute for a task
4050 * @lsmid: LSM identification
4051 * @name: attribute name
4052 * @value: attribute value
4054 * Read attribute @name for task @p and store it into @value if allowed.
4056 * Return: Returns the length of @value on success, a negative value otherwise.
4058 int security_getprocattr(struct task_struct *p, int lsmid, const char *name,
4061 struct security_hook_list *hp;
4063 hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
4064 if (lsmid != 0 && lsmid != hp->lsmid->id)
4066 return hp->hook.getprocattr(p, name, value);
4068 return LSM_RET_DEFAULT(getprocattr);
4072 * security_setprocattr() - Set an attribute for a task
4073 * @lsmid: LSM identification
4074 * @name: attribute name
4075 * @value: attribute value
4076 * @size: attribute value size
4078 * Write (set) the current task's attribute @name to @value, size @size if
4081 * Return: Returns bytes written on success, a negative value otherwise.
4083 int security_setprocattr(int lsmid, const char *name, void *value, size_t size)
4085 struct security_hook_list *hp;
4087 hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
4088 if (lsmid != 0 && lsmid != hp->lsmid->id)
4090 return hp->hook.setprocattr(name, value, size);
4092 return LSM_RET_DEFAULT(setprocattr);
4096 * security_netlink_send() - Save info and check if netlink sending is allowed
4097 * @sk: sending socket
4098 * @skb: netlink message
4100 * Save security information for a netlink message so that permission checking
4101 * can be performed when the message is processed. The security information
4102 * can be saved using the eff_cap field of the netlink_skb_parms structure.
4103 * Also may be used to provide fine grained control over message transmission.
4105 * Return: Returns 0 if the information was successfully saved and message is
4106 * allowed to be transmitted.
4108 int security_netlink_send(struct sock *sk, struct sk_buff *skb)
4110 return call_int_hook(netlink_send, 0, sk, skb);
4114 * security_ismaclabel() - Check is the named attribute is a MAC label
4115 * @name: full extended attribute name
4117 * Check if the extended attribute specified by @name represents a MAC label.
4119 * Return: Returns 1 if name is a MAC attribute otherwise returns 0.
4121 int security_ismaclabel(const char *name)
4123 return call_int_hook(ismaclabel, 0, name);
4125 EXPORT_SYMBOL(security_ismaclabel);
4128 * security_secid_to_secctx() - Convert a secid to a secctx
4131 * @seclen: secctx length
4133 * Convert secid to security context. If @secdata is NULL the length of the
4134 * result will be returned in @seclen, but no @secdata will be returned. This
4135 * does mean that the length could change between calls to check the length and
4136 * the next call which actually allocates and returns the @secdata.
4138 * Return: Return 0 on success, error on failure.
4140 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4142 struct security_hook_list *hp;
4146 * Currently, only one LSM can implement secid_to_secctx (i.e this
4147 * LSM hook is not "stackable").
4149 hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
4150 rc = hp->hook.secid_to_secctx(secid, secdata, seclen);
4151 if (rc != LSM_RET_DEFAULT(secid_to_secctx))
4155 return LSM_RET_DEFAULT(secid_to_secctx);
4157 EXPORT_SYMBOL(security_secid_to_secctx);
4160 * security_secctx_to_secid() - Convert a secctx to a secid
4162 * @seclen: length of secctx
4165 * Convert security context to secid.
4167 * Return: Returns 0 on success, error on failure.
4169 int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4172 return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid);
4174 EXPORT_SYMBOL(security_secctx_to_secid);
4177 * security_release_secctx() - Free a secctx buffer
4179 * @seclen: length of secctx
4181 * Release the security context.
4183 void security_release_secctx(char *secdata, u32 seclen)
4185 call_void_hook(release_secctx, secdata, seclen);
4187 EXPORT_SYMBOL(security_release_secctx);
4190 * security_inode_invalidate_secctx() - Invalidate an inode's security label
4193 * Notify the security module that it must revalidate the security context of
4196 void security_inode_invalidate_secctx(struct inode *inode)
4198 call_void_hook(inode_invalidate_secctx, inode);
4200 EXPORT_SYMBOL(security_inode_invalidate_secctx);
4203 * security_inode_notifysecctx() - Notify the LSM of an inode's security label
4206 * @ctxlen: length of secctx
4208 * Notify the security module of what the security context of an inode should
4209 * be. Initializes the incore security context managed by the security module
4210 * for this inode. Example usage: NFS client invokes this hook to initialize
4211 * the security context in its incore inode to the value provided by the server
4212 * for the file when the server returned the file's attributes to the client.
4213 * Must be called with inode->i_mutex locked.
4215 * Return: Returns 0 on success, error on failure.
4217 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4219 return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen);
4221 EXPORT_SYMBOL(security_inode_notifysecctx);
4224 * security_inode_setsecctx() - Change the security label of an inode
4227 * @ctxlen: length of secctx
4229 * Change the security context of an inode. Updates the incore security
4230 * context managed by the security module and invokes the fs code as needed
4231 * (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
4232 * context. Example usage: NFS server invokes this hook to change the security
4233 * context in its incore inode and on the backing filesystem to a value
4234 * provided by the client on a SETATTR operation. Must be called with
4235 * inode->i_mutex locked.
4237 * Return: Returns 0 on success, error on failure.
4239 int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4241 return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen);
4243 EXPORT_SYMBOL(security_inode_setsecctx);
4246 * security_inode_getsecctx() - Get the security label of an inode
4249 * @ctxlen: length of secctx
4251 * On success, returns 0 and fills out @ctx and @ctxlen with the security
4252 * context for the given @inode.
4254 * Return: Returns 0 on success, error on failure.
4256 int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4258 return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen);
4260 EXPORT_SYMBOL(security_inode_getsecctx);
4262 #ifdef CONFIG_WATCH_QUEUE
4264 * security_post_notification() - Check if a watch notification can be posted
4265 * @w_cred: credentials of the task that set the watch
4266 * @cred: credentials of the task which triggered the watch
4267 * @n: the notification
4269 * Check to see if a watch notification can be posted to a particular queue.
4271 * Return: Returns 0 if permission is granted.
4273 int security_post_notification(const struct cred *w_cred,
4274 const struct cred *cred,
4275 struct watch_notification *n)
4277 return call_int_hook(post_notification, 0, w_cred, cred, n);
4279 #endif /* CONFIG_WATCH_QUEUE */
4281 #ifdef CONFIG_KEY_NOTIFICATIONS
4283 * security_watch_key() - Check if a task is allowed to watch for key events
4284 * @key: the key to watch
4286 * Check to see if a process is allowed to watch for event notifications from
4289 * Return: Returns 0 if permission is granted.
4291 int security_watch_key(struct key *key)
4293 return call_int_hook(watch_key, 0, key);
4295 #endif /* CONFIG_KEY_NOTIFICATIONS */
4297 #ifdef CONFIG_SECURITY_NETWORK
4299 * security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
4300 * @sock: originating sock
4304 * Check permissions before establishing a Unix domain stream connection
4305 * between @sock and @other.
4307 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4308 * Linux provides an alternative to the conventional file name space for Unix
4309 * domain sockets. Whereas binding and connecting to sockets in the file name
4310 * space is mediated by the typical file permissions (and caught by the mknod
4311 * and permission hooks in inode_security_ops), binding and connecting to
4312 * sockets in the abstract name space is completely unmediated. Sufficient
4313 * control of Unix domain sockets in the abstract name space isn't possible
4314 * using only the socket layer hooks, since we need to know the actual target
4315 * socket, which is not looked up until we are inside the af_unix code.
4317 * Return: Returns 0 if permission is granted.
4319 int security_unix_stream_connect(struct sock *sock, struct sock *other,
4322 return call_int_hook(unix_stream_connect, 0, sock, other, newsk);
4324 EXPORT_SYMBOL(security_unix_stream_connect);
4327 * security_unix_may_send() - Check if AF_UNIX socket can send datagrams
4328 * @sock: originating sock
4331 * Check permissions before connecting or sending datagrams from @sock to
4334 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4335 * Linux provides an alternative to the conventional file name space for Unix
4336 * domain sockets. Whereas binding and connecting to sockets in the file name
4337 * space is mediated by the typical file permissions (and caught by the mknod
4338 * and permission hooks in inode_security_ops), binding and connecting to
4339 * sockets in the abstract name space is completely unmediated. Sufficient
4340 * control of Unix domain sockets in the abstract name space isn't possible
4341 * using only the socket layer hooks, since we need to know the actual target
4342 * socket, which is not looked up until we are inside the af_unix code.
4344 * Return: Returns 0 if permission is granted.
4346 int security_unix_may_send(struct socket *sock, struct socket *other)
4348 return call_int_hook(unix_may_send, 0, sock, other);
4350 EXPORT_SYMBOL(security_unix_may_send);
4353 * security_socket_create() - Check if creating a new socket is allowed
4354 * @family: protocol family
4355 * @type: communications type
4356 * @protocol: requested protocol
4357 * @kern: set to 1 if a kernel socket is requested
4359 * Check permissions prior to creating a new socket.
4361 * Return: Returns 0 if permission is granted.
4363 int security_socket_create(int family, int type, int protocol, int kern)
4365 return call_int_hook(socket_create, 0, family, type, protocol, kern);
4369 * security_socket_post_create() - Initialize a newly created socket
4371 * @family: protocol family
4372 * @type: communications type
4373 * @protocol: requested protocol
4374 * @kern: set to 1 if a kernel socket is requested
4376 * This hook allows a module to update or allocate a per-socket security
4377 * structure. Note that the security field was not added directly to the socket
4378 * structure, but rather, the socket security information is stored in the
4379 * associated inode. Typically, the inode alloc_security hook will allocate
4380 * and attach security information to SOCK_INODE(sock)->i_security. This hook
4381 * may be used to update the SOCK_INODE(sock)->i_security field with additional
4382 * information that wasn't available when the inode was allocated.
4384 * Return: Returns 0 if permission is granted.
4386 int security_socket_post_create(struct socket *sock, int family,
4387 int type, int protocol, int kern)
4389 return call_int_hook(socket_post_create, 0, sock, family, type,
4394 * security_socket_socketpair() - Check if creating a socketpair is allowed
4395 * @socka: first socket
4396 * @sockb: second socket
4398 * Check permissions before creating a fresh pair of sockets.
4400 * Return: Returns 0 if permission is granted and the connection was
4403 int security_socket_socketpair(struct socket *socka, struct socket *sockb)
4405 return call_int_hook(socket_socketpair, 0, socka, sockb);
4407 EXPORT_SYMBOL(security_socket_socketpair);
4410 * security_socket_bind() - Check if a socket bind operation is allowed
4412 * @address: requested bind address
4413 * @addrlen: length of address
4415 * Check permission before socket protocol layer bind operation is performed
4416 * and the socket @sock is bound to the address specified in the @address
4419 * Return: Returns 0 if permission is granted.
4421 int security_socket_bind(struct socket *sock,
4422 struct sockaddr *address, int addrlen)
4424 return call_int_hook(socket_bind, 0, sock, address, addrlen);
4428 * security_socket_connect() - Check if a socket connect operation is allowed
4430 * @address: address of remote connection point
4431 * @addrlen: length of address
4433 * Check permission before socket protocol layer connect operation attempts to
4434 * connect socket @sock to a remote address, @address.
4436 * Return: Returns 0 if permission is granted.
4438 int security_socket_connect(struct socket *sock,
4439 struct sockaddr *address, int addrlen)
4441 return call_int_hook(socket_connect, 0, sock, address, addrlen);
4445 * security_socket_listen() - Check if a socket is allowed to listen
4447 * @backlog: connection queue size
4449 * Check permission before socket protocol layer listen operation.
4451 * Return: Returns 0 if permission is granted.
4453 int security_socket_listen(struct socket *sock, int backlog)
4455 return call_int_hook(socket_listen, 0, sock, backlog);
4459 * security_socket_accept() - Check if a socket is allowed to accept connections
4460 * @sock: listening socket
4461 * @newsock: newly creation connection socket
4463 * Check permission before accepting a new connection. Note that the new
4464 * socket, @newsock, has been created and some information copied to it, but
4465 * the accept operation has not actually been performed.
4467 * Return: Returns 0 if permission is granted.
4469 int security_socket_accept(struct socket *sock, struct socket *newsock)
4471 return call_int_hook(socket_accept, 0, sock, newsock);
4475 * security_socket_sendmsg() - Check is sending a message is allowed
4476 * @sock: sending socket
4477 * @msg: message to send
4478 * @size: size of message
4480 * Check permission before transmitting a message to another socket.
4482 * Return: Returns 0 if permission is granted.
4484 int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
4486 return call_int_hook(socket_sendmsg, 0, sock, msg, size);
4490 * security_socket_recvmsg() - Check if receiving a message is allowed
4491 * @sock: receiving socket
4492 * @msg: message to receive
4493 * @size: size of message
4494 * @flags: operational flags
4496 * Check permission before receiving a message from a socket.
4498 * Return: Returns 0 if permission is granted.
4500 int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
4501 int size, int flags)
4503 return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags);
4507 * security_socket_getsockname() - Check if reading the socket addr is allowed
4510 * Check permission before reading the local address (name) of the socket
4513 * Return: Returns 0 if permission is granted.
4515 int security_socket_getsockname(struct socket *sock)
4517 return call_int_hook(socket_getsockname, 0, sock);
4521 * security_socket_getpeername() - Check if reading the peer's addr is allowed
4524 * Check permission before the remote address (name) of a socket object.
4526 * Return: Returns 0 if permission is granted.
4528 int security_socket_getpeername(struct socket *sock)
4530 return call_int_hook(socket_getpeername, 0, sock);
4534 * security_socket_getsockopt() - Check if reading a socket option is allowed
4536 * @level: option's protocol level
4537 * @optname: option name
4539 * Check permissions before retrieving the options associated with socket
4542 * Return: Returns 0 if permission is granted.
4544 int security_socket_getsockopt(struct socket *sock, int level, int optname)
4546 return call_int_hook(socket_getsockopt, 0, sock, level, optname);
4550 * security_socket_setsockopt() - Check if setting a socket option is allowed
4552 * @level: option's protocol level
4553 * @optname: option name
4555 * Check permissions before setting the options associated with socket @sock.
4557 * Return: Returns 0 if permission is granted.
4559 int security_socket_setsockopt(struct socket *sock, int level, int optname)
4561 return call_int_hook(socket_setsockopt, 0, sock, level, optname);
4565 * security_socket_shutdown() - Checks if shutting down the socket is allowed
4567 * @how: flag indicating how sends and receives are handled
4569 * Checks permission before all or part of a connection on the socket @sock is
4572 * Return: Returns 0 if permission is granted.
4574 int security_socket_shutdown(struct socket *sock, int how)
4576 return call_int_hook(socket_shutdown, 0, sock, how);
4580 * security_sock_rcv_skb() - Check if an incoming network packet is allowed
4581 * @sk: destination sock
4582 * @skb: incoming packet
4584 * Check permissions on incoming network packets. This hook is distinct from
4585 * Netfilter's IP input hooks since it is the first time that the incoming
4586 * sk_buff @skb has been associated with a particular socket, @sk. Must not
4587 * sleep inside this hook because some callers hold spinlocks.
4589 * Return: Returns 0 if permission is granted.
4591 int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
4593 return call_int_hook(socket_sock_rcv_skb, 0, sk, skb);
4595 EXPORT_SYMBOL(security_sock_rcv_skb);
4598 * security_socket_getpeersec_stream() - Get the remote peer label
4600 * @optval: destination buffer
4601 * @optlen: size of peer label copied into the buffer
4602 * @len: maximum size of the destination buffer
4604 * This hook allows the security module to provide peer socket security state
4605 * for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
4606 * For tcp sockets this can be meaningful if the socket is associated with an
4609 * Return: Returns 0 if all is well, otherwise, typical getsockopt return
4612 int security_socket_getpeersec_stream(struct socket *sock, sockptr_t optval,
4613 sockptr_t optlen, unsigned int len)
4615 return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
4616 optval, optlen, len);
4620 * security_socket_getpeersec_dgram() - Get the remote peer label
4622 * @skb: datagram packet
4623 * @secid: remote peer label secid
4625 * This hook allows the security module to provide peer socket security state
4626 * for udp sockets on a per-packet basis to userspace via getsockopt
4627 * SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
4628 * option via getsockopt. It can then retrieve the security state returned by
4629 * this hook for a packet via the SCM_SECURITY ancillary message type.
4631 * Return: Returns 0 on success, error on failure.
4633 int security_socket_getpeersec_dgram(struct socket *sock,
4634 struct sk_buff *skb, u32 *secid)
4636 return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock,
4639 EXPORT_SYMBOL(security_socket_getpeersec_dgram);
4642 * security_sk_alloc() - Allocate and initialize a sock's LSM blob
4644 * @family: protocol family
4645 * @priority: gfp flags
4647 * Allocate and attach a security structure to the sk->sk_security field, which
4648 * is used to copy security attributes between local stream sockets.
4650 * Return: Returns 0 on success, error on failure.
4652 int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
4654 return call_int_hook(sk_alloc_security, 0, sk, family, priority);
4658 * security_sk_free() - Free the sock's LSM blob
4661 * Deallocate security structure.
4663 void security_sk_free(struct sock *sk)
4665 call_void_hook(sk_free_security, sk);
4669 * security_sk_clone() - Clone a sock's LSM state
4670 * @sk: original sock
4671 * @newsk: target sock
4673 * Clone/copy security structure.
4675 void security_sk_clone(const struct sock *sk, struct sock *newsk)
4677 call_void_hook(sk_clone_security, sk, newsk);
4679 EXPORT_SYMBOL(security_sk_clone);
4682 * security_sk_classify_flow() - Set a flow's secid based on socket
4683 * @sk: original socket
4684 * @flic: target flow
4686 * Set the target flow's secid to socket's secid.
4688 void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic)
4690 call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
4692 EXPORT_SYMBOL(security_sk_classify_flow);
4695 * security_req_classify_flow() - Set a flow's secid based on request_sock
4696 * @req: request_sock
4697 * @flic: target flow
4699 * Sets @flic's secid to @req's secid.
4701 void security_req_classify_flow(const struct request_sock *req,
4702 struct flowi_common *flic)
4704 call_void_hook(req_classify_flow, req, flic);
4706 EXPORT_SYMBOL(security_req_classify_flow);
4709 * security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
4710 * @sk: sock being grafted
4711 * @parent: target parent socket
4713 * Sets @parent's inode secid to @sk's secid and update @sk with any necessary
4714 * LSM state from @parent.
4716 void security_sock_graft(struct sock *sk, struct socket *parent)
4718 call_void_hook(sock_graft, sk, parent);
4720 EXPORT_SYMBOL(security_sock_graft);
4723 * security_inet_conn_request() - Set request_sock state using incoming connect
4724 * @sk: parent listening sock
4725 * @skb: incoming connection
4726 * @req: new request_sock
4728 * Initialize the @req LSM state based on @sk and the incoming connect in @skb.
4730 * Return: Returns 0 if permission is granted.
4732 int security_inet_conn_request(const struct sock *sk,
4733 struct sk_buff *skb, struct request_sock *req)
4735 return call_int_hook(inet_conn_request, 0, sk, skb, req);
4737 EXPORT_SYMBOL(security_inet_conn_request);
4740 * security_inet_csk_clone() - Set new sock LSM state based on request_sock
4742 * @req: connection request_sock
4744 * Set that LSM state of @sock using the LSM state from @req.
4746 void security_inet_csk_clone(struct sock *newsk,
4747 const struct request_sock *req)
4749 call_void_hook(inet_csk_clone, newsk, req);
4753 * security_inet_conn_established() - Update sock's LSM state with connection
4755 * @skb: connection packet
4757 * Update @sock's LSM state to represent a new connection from @skb.
4759 void security_inet_conn_established(struct sock *sk,
4760 struct sk_buff *skb)
4762 call_void_hook(inet_conn_established, sk, skb);
4764 EXPORT_SYMBOL(security_inet_conn_established);
4767 * security_secmark_relabel_packet() - Check if setting a secmark is allowed
4768 * @secid: new secmark value
4770 * Check if the process should be allowed to relabel packets to @secid.
4772 * Return: Returns 0 if permission is granted.
4774 int security_secmark_relabel_packet(u32 secid)
4776 return call_int_hook(secmark_relabel_packet, 0, secid);
4778 EXPORT_SYMBOL(security_secmark_relabel_packet);
4781 * security_secmark_refcount_inc() - Increment the secmark labeling rule count
4783 * Tells the LSM to increment the number of secmark labeling rules loaded.
4785 void security_secmark_refcount_inc(void)
4787 call_void_hook(secmark_refcount_inc);
4789 EXPORT_SYMBOL(security_secmark_refcount_inc);
4792 * security_secmark_refcount_dec() - Decrement the secmark labeling rule count
4794 * Tells the LSM to decrement the number of secmark labeling rules loaded.
4796 void security_secmark_refcount_dec(void)
4798 call_void_hook(secmark_refcount_dec);
4800 EXPORT_SYMBOL(security_secmark_refcount_dec);
4803 * security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
4804 * @security: pointer to the LSM blob
4806 * This hook allows a module to allocate a security structure for a TUN device,
4807 * returning the pointer in @security.
4809 * Return: Returns a zero on success, negative values on failure.
4811 int security_tun_dev_alloc_security(void **security)
4813 return call_int_hook(tun_dev_alloc_security, 0, security);
4815 EXPORT_SYMBOL(security_tun_dev_alloc_security);
4818 * security_tun_dev_free_security() - Free a TUN device LSM blob
4819 * @security: LSM blob
4821 * This hook allows a module to free the security structure for a TUN device.
4823 void security_tun_dev_free_security(void *security)
4825 call_void_hook(tun_dev_free_security, security);
4827 EXPORT_SYMBOL(security_tun_dev_free_security);
4830 * security_tun_dev_create() - Check if creating a TUN device is allowed
4832 * Check permissions prior to creating a new TUN device.
4834 * Return: Returns 0 if permission is granted.
4836 int security_tun_dev_create(void)
4838 return call_int_hook(tun_dev_create, 0);
4840 EXPORT_SYMBOL(security_tun_dev_create);
4843 * security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
4844 * @security: TUN device LSM blob
4846 * Check permissions prior to attaching to a TUN device queue.
4848 * Return: Returns 0 if permission is granted.
4850 int security_tun_dev_attach_queue(void *security)
4852 return call_int_hook(tun_dev_attach_queue, 0, security);
4854 EXPORT_SYMBOL(security_tun_dev_attach_queue);
4857 * security_tun_dev_attach() - Update TUN device LSM state on attach
4858 * @sk: associated sock
4859 * @security: TUN device LSM blob
4861 * This hook can be used by the module to update any security state associated
4862 * with the TUN device's sock structure.
4864 * Return: Returns 0 if permission is granted.
4866 int security_tun_dev_attach(struct sock *sk, void *security)
4868 return call_int_hook(tun_dev_attach, 0, sk, security);
4870 EXPORT_SYMBOL(security_tun_dev_attach);
4873 * security_tun_dev_open() - Update TUN device LSM state on open
4874 * @security: TUN device LSM blob
4876 * This hook can be used by the module to update any security state associated
4877 * with the TUN device's security structure.
4879 * Return: Returns 0 if permission is granted.
4881 int security_tun_dev_open(void *security)
4883 return call_int_hook(tun_dev_open, 0, security);
4885 EXPORT_SYMBOL(security_tun_dev_open);
4888 * security_sctp_assoc_request() - Update the LSM on a SCTP association req
4889 * @asoc: SCTP association
4890 * @skb: packet requesting the association
4892 * Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
4894 * Return: Returns 0 on success, error on failure.
4896 int security_sctp_assoc_request(struct sctp_association *asoc,
4897 struct sk_buff *skb)
4899 return call_int_hook(sctp_assoc_request, 0, asoc, skb);
4901 EXPORT_SYMBOL(security_sctp_assoc_request);
4904 * security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
4906 * @optname: SCTP option to validate
4907 * @address: list of IP addresses to validate
4908 * @addrlen: length of the address list
4910 * Validiate permissions required for each address associated with sock @sk.
4911 * Depending on @optname, the addresses will be treated as either a connect or
4912 * bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
4913 * sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
4915 * Return: Returns 0 on success, error on failure.
4917 int security_sctp_bind_connect(struct sock *sk, int optname,
4918 struct sockaddr *address, int addrlen)
4920 return call_int_hook(sctp_bind_connect, 0, sk, optname,
4923 EXPORT_SYMBOL(security_sctp_bind_connect);
4926 * security_sctp_sk_clone() - Clone a SCTP sock's LSM state
4927 * @asoc: SCTP association
4928 * @sk: original sock
4929 * @newsk: target sock
4931 * Called whenever a new socket is created by accept(2) (i.e. a TCP style
4932 * socket) or when a socket is 'peeled off' e.g userspace calls
4935 void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
4938 call_void_hook(sctp_sk_clone, asoc, sk, newsk);
4940 EXPORT_SYMBOL(security_sctp_sk_clone);
4943 * security_sctp_assoc_established() - Update LSM state when assoc established
4944 * @asoc: SCTP association
4945 * @skb: packet establishing the association
4947 * Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
4950 * Return: Returns 0 if permission is granted.
4952 int security_sctp_assoc_established(struct sctp_association *asoc,
4953 struct sk_buff *skb)
4955 return call_int_hook(sctp_assoc_established, 0, asoc, skb);
4957 EXPORT_SYMBOL(security_sctp_assoc_established);
4960 * security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
4961 * @sk: the owning MPTCP socket
4962 * @ssk: the new subflow
4964 * Update the labeling for the given MPTCP subflow, to match the one of the
4965 * owning MPTCP socket. This hook has to be called after the socket creation and
4966 * initialization via the security_socket_create() and
4967 * security_socket_post_create() LSM hooks.
4969 * Return: Returns 0 on success or a negative error code on failure.
4971 int security_mptcp_add_subflow(struct sock *sk, struct sock *ssk)
4973 return call_int_hook(mptcp_add_subflow, 0, sk, ssk);
4976 #endif /* CONFIG_SECURITY_NETWORK */
4978 #ifdef CONFIG_SECURITY_INFINIBAND
4980 * security_ib_pkey_access() - Check if access to an IB pkey is allowed
4982 * @subnet_prefix: subnet prefix of the port
4985 * Check permission to access a pkey when modifying a QP.
4987 * Return: Returns 0 if permission is granted.
4989 int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey)
4991 return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey);
4993 EXPORT_SYMBOL(security_ib_pkey_access);
4996 * security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
4998 * @dev_name: IB device name
4999 * @port_num: port number
5001 * Check permissions to send and receive SMPs on a end port.
5003 * Return: Returns 0 if permission is granted.
5005 int security_ib_endport_manage_subnet(void *sec,
5006 const char *dev_name, u8 port_num)
5008 return call_int_hook(ib_endport_manage_subnet, 0, sec,
5009 dev_name, port_num);
5011 EXPORT_SYMBOL(security_ib_endport_manage_subnet);
5014 * security_ib_alloc_security() - Allocate an Infiniband LSM blob
5017 * Allocate a security structure for Infiniband objects.
5019 * Return: Returns 0 on success, non-zero on failure.
5021 int security_ib_alloc_security(void **sec)
5023 return call_int_hook(ib_alloc_security, 0, sec);
5025 EXPORT_SYMBOL(security_ib_alloc_security);
5028 * security_ib_free_security() - Free an Infiniband LSM blob
5031 * Deallocate an Infiniband security structure.
5033 void security_ib_free_security(void *sec)
5035 call_void_hook(ib_free_security, sec);
5037 EXPORT_SYMBOL(security_ib_free_security);
5038 #endif /* CONFIG_SECURITY_INFINIBAND */
5040 #ifdef CONFIG_SECURITY_NETWORK_XFRM
5042 * security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
5043 * @ctxp: xfrm security context being added to the SPD
5044 * @sec_ctx: security label provided by userspace
5047 * Allocate a security structure to the xp->security field; the security field
5048 * is initialized to NULL when the xfrm_policy is allocated.
5050 * Return: Return 0 if operation was successful.
5052 int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
5053 struct xfrm_user_sec_ctx *sec_ctx,
5056 return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp);
5058 EXPORT_SYMBOL(security_xfrm_policy_alloc);
5061 * security_xfrm_policy_clone() - Clone xfrm policy LSM state
5062 * @old_ctx: xfrm security context
5063 * @new_ctxp: target xfrm security context
5065 * Allocate a security structure in new_ctxp that contains the information from
5066 * the old_ctx structure.
5068 * Return: Return 0 if operation was successful.
5070 int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
5071 struct xfrm_sec_ctx **new_ctxp)
5073 return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp);
5077 * security_xfrm_policy_free() - Free a xfrm security context
5078 * @ctx: xfrm security context
5080 * Free LSM resources associated with @ctx.
5082 void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
5084 call_void_hook(xfrm_policy_free_security, ctx);
5086 EXPORT_SYMBOL(security_xfrm_policy_free);
5089 * security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
5090 * @ctx: xfrm security context
5092 * Authorize deletion of a SPD entry.
5094 * Return: Returns 0 if permission is granted.
5096 int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
5098 return call_int_hook(xfrm_policy_delete_security, 0, ctx);
5102 * security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
5103 * @x: xfrm state being added to the SAD
5104 * @sec_ctx: security label provided by userspace
5106 * Allocate a security structure to the @x->security field; the security field
5107 * is initialized to NULL when the xfrm_state is allocated. Set the context to
5108 * correspond to @sec_ctx.
5110 * Return: Return 0 if operation was successful.
5112 int security_xfrm_state_alloc(struct xfrm_state *x,
5113 struct xfrm_user_sec_ctx *sec_ctx)
5115 return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx);
5117 EXPORT_SYMBOL(security_xfrm_state_alloc);
5120 * security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
5121 * @x: xfrm state being added to the SAD
5122 * @polsec: associated policy's security context
5123 * @secid: secid from the flow
5125 * Allocate a security structure to the x->security field; the security field
5126 * is initialized to NULL when the xfrm_state is allocated. Set the context to
5127 * correspond to secid.
5129 * Return: Returns 0 if operation was successful.
5131 int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
5132 struct xfrm_sec_ctx *polsec, u32 secid)
5134 return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid);
5138 * security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
5141 * Authorize deletion of x->security.
5143 * Return: Returns 0 if permission is granted.
5145 int security_xfrm_state_delete(struct xfrm_state *x)
5147 return call_int_hook(xfrm_state_delete_security, 0, x);
5149 EXPORT_SYMBOL(security_xfrm_state_delete);
5152 * security_xfrm_state_free() - Free a xfrm state
5155 * Deallocate x->security.
5157 void security_xfrm_state_free(struct xfrm_state *x)
5159 call_void_hook(xfrm_state_free_security, x);
5163 * security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
5164 * @ctx: target xfrm security context
5165 * @fl_secid: flow secid used to authorize access
5167 * Check permission when a flow selects a xfrm_policy for processing XFRMs on a
5168 * packet. The hook is called when selecting either a per-socket policy or a
5169 * generic xfrm policy.
5171 * Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
5174 int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
5176 return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid);
5180 * security_xfrm_state_pol_flow_match() - Check for a xfrm match
5181 * @x: xfrm state to match
5182 * @xp: xfrm policy to check for a match
5183 * @flic: flow to check for a match.
5185 * Check @xp and @flic for a match with @x.
5187 * Return: Returns 1 if there is a match.
5189 int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
5190 struct xfrm_policy *xp,
5191 const struct flowi_common *flic)
5193 struct security_hook_list *hp;
5194 int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match);
5197 * Since this function is expected to return 0 or 1, the judgment
5198 * becomes difficult if multiple LSMs supply this call. Fortunately,
5199 * we can use the first LSM's judgment because currently only SELinux
5200 * supplies this call.
5202 * For speed optimization, we explicitly break the loop rather than
5205 hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
5207 rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic);
5214 * security_xfrm_decode_session() - Determine the xfrm secid for a packet
5218 * Decode the packet in @skb and return the security label in @secid.
5220 * Return: Return 0 if all xfrms used have the same secid.
5222 int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
5224 return call_int_hook(xfrm_decode_session, 0, skb, secid, 1);
5227 void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic)
5229 int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid,
5234 EXPORT_SYMBOL(security_skb_classify_flow);
5235 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
5239 * security_key_alloc() - Allocate and initialize a kernel key LSM blob
5241 * @cred: credentials
5242 * @flags: allocation flags
5244 * Permit allocation of a key and assign security data. Note that key does not
5245 * have a serial number assigned at this point.
5247 * Return: Return 0 if permission is granted, -ve error otherwise.
5249 int security_key_alloc(struct key *key, const struct cred *cred,
5250 unsigned long flags)
5252 return call_int_hook(key_alloc, 0, key, cred, flags);
5256 * security_key_free() - Free a kernel key LSM blob
5259 * Notification of destruction; free security data.
5261 void security_key_free(struct key *key)
5263 call_void_hook(key_free, key);
5267 * security_key_permission() - Check if a kernel key operation is allowed
5268 * @key_ref: key reference
5269 * @cred: credentials of actor requesting access
5270 * @need_perm: requested permissions
5272 * See whether a specific operational right is granted to a process on a key.
5274 * Return: Return 0 if permission is granted, -ve error otherwise.
5276 int security_key_permission(key_ref_t key_ref, const struct cred *cred,
5277 enum key_need_perm need_perm)
5279 return call_int_hook(key_permission, 0, key_ref, cred, need_perm);
5283 * security_key_getsecurity() - Get the key's security label
5285 * @buffer: security label buffer
5287 * Get a textual representation of the security context attached to a key for
5288 * the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
5289 * storage for the NUL-terminated string and the caller should free it.
5291 * Return: Returns the length of @buffer (including terminating NUL) or -ve if
5292 * an error occurs. May also return 0 (and a NULL buffer pointer) if
5293 * there is no security label assigned to the key.
5295 int security_key_getsecurity(struct key *key, char **buffer)
5298 return call_int_hook(key_getsecurity, 0, key, buffer);
5300 #endif /* CONFIG_KEYS */
5304 * security_audit_rule_init() - Allocate and init an LSM audit rule struct
5305 * @field: audit action
5306 * @op: rule operator
5307 * @rulestr: rule context
5308 * @lsmrule: receive buffer for audit rule struct
5310 * Allocate and initialize an LSM audit rule structure.
5312 * Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
5315 int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
5317 return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule);
5321 * security_audit_rule_known() - Check if an audit rule contains LSM fields
5322 * @krule: audit rule
5324 * Specifies whether given @krule contains any fields related to the current
5327 * Return: Returns 1 in case of relation found, 0 otherwise.
5329 int security_audit_rule_known(struct audit_krule *krule)
5331 return call_int_hook(audit_rule_known, 0, krule);
5335 * security_audit_rule_free() - Free an LSM audit rule struct
5336 * @lsmrule: audit rule struct
5338 * Deallocate the LSM audit rule structure previously allocated by
5339 * audit_rule_init().
5341 void security_audit_rule_free(void *lsmrule)
5343 call_void_hook(audit_rule_free, lsmrule);
5347 * security_audit_rule_match() - Check if a label matches an audit rule
5348 * @secid: security label
5349 * @field: LSM audit field
5350 * @op: matching operator
5351 * @lsmrule: audit rule
5353 * Determine if given @secid matches a rule previously approved by
5354 * security_audit_rule_known().
5356 * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
5359 int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule)
5361 return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule);
5363 #endif /* CONFIG_AUDIT */
5365 #ifdef CONFIG_BPF_SYSCALL
5367 * security_bpf() - Check if the bpf syscall operation is allowed
5369 * @attr: bpf attribute
5372 * Do a initial check for all bpf syscalls after the attribute is copied into
5373 * the kernel. The actual security module can implement their own rules to
5374 * check the specific cmd they need.
5376 * Return: Returns 0 if permission is granted.
5378 int security_bpf(int cmd, union bpf_attr *attr, unsigned int size)
5380 return call_int_hook(bpf, 0, cmd, attr, size);
5384 * security_bpf_map() - Check if access to a bpf map is allowed
5388 * Do a check when the kernel generates and returns a file descriptor for eBPF
5391 * Return: Returns 0 if permission is granted.
5393 int security_bpf_map(struct bpf_map *map, fmode_t fmode)
5395 return call_int_hook(bpf_map, 0, map, fmode);
5399 * security_bpf_prog() - Check if access to a bpf program is allowed
5400 * @prog: bpf program
5402 * Do a check when the kernel generates and returns a file descriptor for eBPF
5405 * Return: Returns 0 if permission is granted.
5407 int security_bpf_prog(struct bpf_prog *prog)
5409 return call_int_hook(bpf_prog, 0, prog);
5413 * security_bpf_map_alloc() - Allocate a bpf map LSM blob
5416 * Initialize the security field inside bpf map.
5418 * Return: Returns 0 on success, error on failure.
5420 int security_bpf_map_alloc(struct bpf_map *map)
5422 return call_int_hook(bpf_map_alloc_security, 0, map);
5426 * security_bpf_prog_alloc() - Allocate a bpf program LSM blob
5427 * @aux: bpf program aux info struct
5429 * Initialize the security field inside bpf program.
5431 * Return: Returns 0 on success, error on failure.
5433 int security_bpf_prog_alloc(struct bpf_prog_aux *aux)
5435 return call_int_hook(bpf_prog_alloc_security, 0, aux);
5439 * security_bpf_map_free() - Free a bpf map's LSM blob
5442 * Clean up the security information stored inside bpf map.
5444 void security_bpf_map_free(struct bpf_map *map)
5446 call_void_hook(bpf_map_free_security, map);
5450 * security_bpf_prog_free() - Free a bpf program's LSM blob
5451 * @aux: bpf program aux info struct
5453 * Clean up the security information stored inside bpf prog.
5455 void security_bpf_prog_free(struct bpf_prog_aux *aux)
5457 call_void_hook(bpf_prog_free_security, aux);
5459 #endif /* CONFIG_BPF_SYSCALL */
5462 * security_locked_down() - Check if a kernel feature is allowed
5463 * @what: requested kernel feature
5465 * Determine whether a kernel feature that potentially enables arbitrary code
5466 * execution in kernel space should be permitted.
5468 * Return: Returns 0 if permission is granted.
5470 int security_locked_down(enum lockdown_reason what)
5472 return call_int_hook(locked_down, 0, what);
5474 EXPORT_SYMBOL(security_locked_down);
5476 #ifdef CONFIG_PERF_EVENTS
5478 * security_perf_event_open() - Check if a perf event open is allowed
5479 * @attr: perf event attribute
5480 * @type: type of event
5482 * Check whether the @type of perf_event_open syscall is allowed.
5484 * Return: Returns 0 if permission is granted.
5486 int security_perf_event_open(struct perf_event_attr *attr, int type)
5488 return call_int_hook(perf_event_open, 0, attr, type);
5492 * security_perf_event_alloc() - Allocate a perf event LSM blob
5493 * @event: perf event
5495 * Allocate and save perf_event security info.
5497 * Return: Returns 0 on success, error on failure.
5499 int security_perf_event_alloc(struct perf_event *event)
5501 return call_int_hook(perf_event_alloc, 0, event);
5505 * security_perf_event_free() - Free a perf event LSM blob
5506 * @event: perf event
5508 * Release (free) perf_event security info.
5510 void security_perf_event_free(struct perf_event *event)
5512 call_void_hook(perf_event_free, event);
5516 * security_perf_event_read() - Check if reading a perf event label is allowed
5517 * @event: perf event
5519 * Read perf_event security info if allowed.
5521 * Return: Returns 0 if permission is granted.
5523 int security_perf_event_read(struct perf_event *event)
5525 return call_int_hook(perf_event_read, 0, event);
5529 * security_perf_event_write() - Check if writing a perf event label is allowed
5530 * @event: perf event
5532 * Write perf_event security info if allowed.
5534 * Return: Returns 0 if permission is granted.
5536 int security_perf_event_write(struct perf_event *event)
5538 return call_int_hook(perf_event_write, 0, event);
5540 #endif /* CONFIG_PERF_EVENTS */
5542 #ifdef CONFIG_IO_URING
5544 * security_uring_override_creds() - Check if overriding creds is allowed
5545 * @new: new credentials
5547 * Check if the current task, executing an io_uring operation, is allowed to
5548 * override it's credentials with @new.
5550 * Return: Returns 0 if permission is granted.
5552 int security_uring_override_creds(const struct cred *new)
5554 return call_int_hook(uring_override_creds, 0, new);
5558 * security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
5560 * Check whether the current task is allowed to spawn a io_uring polling thread
5561 * (IORING_SETUP_SQPOLL).
5563 * Return: Returns 0 if permission is granted.
5565 int security_uring_sqpoll(void)
5567 return call_int_hook(uring_sqpoll, 0);
5571 * security_uring_cmd() - Check if a io_uring passthrough command is allowed
5574 * Check whether the file_operations uring_cmd is allowed to run.
5576 * Return: Returns 0 if permission is granted.
5578 int security_uring_cmd(struct io_uring_cmd *ioucmd)
5580 return call_int_hook(uring_cmd, 0, ioucmd);
5582 #endif /* CONFIG_IO_URING */