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 #define MAX_LSM_EVM_XATTR 2
36 /* How many LSMs were built into the kernel? */
37 #define LSM_COUNT (__end_lsm_info - __start_lsm_info)
40 * These are descriptions of the reasons that can be passed to the
41 * security_locked_down() LSM hook. Placing this array here allows
42 * all security modules to use the same descriptions for auditing
45 const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX + 1] = {
46 [LOCKDOWN_NONE] = "none",
47 [LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading",
48 [LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port",
49 [LOCKDOWN_EFI_TEST] = "/dev/efi_test access",
50 [LOCKDOWN_KEXEC] = "kexec of unsigned images",
51 [LOCKDOWN_HIBERNATION] = "hibernation",
52 [LOCKDOWN_PCI_ACCESS] = "direct PCI access",
53 [LOCKDOWN_IOPORT] = "raw io port access",
54 [LOCKDOWN_MSR] = "raw MSR access",
55 [LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables",
56 [LOCKDOWN_DEVICE_TREE] = "modifying device tree contents",
57 [LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage",
58 [LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO",
59 [LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters",
60 [LOCKDOWN_MMIOTRACE] = "unsafe mmio",
61 [LOCKDOWN_DEBUGFS] = "debugfs access",
62 [LOCKDOWN_XMON_WR] = "xmon write access",
63 [LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM",
64 [LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM",
65 [LOCKDOWN_RTAS_ERROR_INJECTION] = "RTAS error injection",
66 [LOCKDOWN_INTEGRITY_MAX] = "integrity",
67 [LOCKDOWN_KCORE] = "/proc/kcore access",
68 [LOCKDOWN_KPROBES] = "use of kprobes",
69 [LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM",
70 [LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM",
71 [LOCKDOWN_PERF] = "unsafe use of perf",
72 [LOCKDOWN_TRACEFS] = "use of tracefs",
73 [LOCKDOWN_XMON_RW] = "xmon read and write access",
74 [LOCKDOWN_XFRM_SECRET] = "xfrm SA secret",
75 [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
78 struct security_hook_heads security_hook_heads __ro_after_init;
79 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain);
81 static struct kmem_cache *lsm_file_cache;
82 static struct kmem_cache *lsm_inode_cache;
85 static struct lsm_blob_sizes blob_sizes __ro_after_init;
87 /* Boot-time LSM user choice */
88 static __initdata const char *chosen_lsm_order;
89 static __initdata const char *chosen_major_lsm;
91 static __initconst const char *const builtin_lsm_order = CONFIG_LSM;
93 /* Ordered list of LSMs to initialize. */
94 static __initdata struct lsm_info **ordered_lsms;
95 static __initdata struct lsm_info *exclusive;
97 static __initdata bool debug;
98 #define init_debug(...) \
101 pr_info(__VA_ARGS__); \
104 static bool __init is_enabled(struct lsm_info *lsm)
109 return *lsm->enabled;
112 /* Mark an LSM's enabled flag. */
113 static int lsm_enabled_true __initdata = 1;
114 static int lsm_enabled_false __initdata = 0;
115 static void __init set_enabled(struct lsm_info *lsm, bool enabled)
118 * When an LSM hasn't configured an enable variable, we can use
119 * a hard-coded location for storing the default enabled state.
123 lsm->enabled = &lsm_enabled_true;
125 lsm->enabled = &lsm_enabled_false;
126 } else if (lsm->enabled == &lsm_enabled_true) {
128 lsm->enabled = &lsm_enabled_false;
129 } else if (lsm->enabled == &lsm_enabled_false) {
131 lsm->enabled = &lsm_enabled_true;
133 *lsm->enabled = enabled;
137 /* Is an LSM already listed in the ordered LSMs list? */
138 static bool __init exists_ordered_lsm(struct lsm_info *lsm)
140 struct lsm_info **check;
142 for (check = ordered_lsms; *check; check++)
149 /* Append an LSM to the list of ordered LSMs to initialize. */
150 static int last_lsm __initdata;
151 static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
153 /* Ignore duplicate selections. */
154 if (exists_ordered_lsm(lsm))
157 if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from))
160 /* Enable this LSM, if it is not already set. */
162 lsm->enabled = &lsm_enabled_true;
163 ordered_lsms[last_lsm++] = lsm;
165 init_debug("%s ordered: %s (%s)\n", from, lsm->name,
166 is_enabled(lsm) ? "enabled" : "disabled");
169 /* Is an LSM allowed to be initialized? */
170 static bool __init lsm_allowed(struct lsm_info *lsm)
172 /* Skip if the LSM is disabled. */
173 if (!is_enabled(lsm))
176 /* Not allowed if another exclusive LSM already initialized. */
177 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) {
178 init_debug("exclusive disabled: %s\n", lsm->name);
185 static void __init lsm_set_blob_size(int *need, int *lbs)
192 offset = ALIGN(*lbs, sizeof(void *));
193 *lbs = offset + *need;
197 static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
202 lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
203 lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file);
205 * The inode blob gets an rcu_head in addition to
206 * what the modules might need.
208 if (needed->lbs_inode && blob_sizes.lbs_inode == 0)
209 blob_sizes.lbs_inode = sizeof(struct rcu_head);
210 lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
211 lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
212 lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
213 lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
214 lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
217 /* Prepare LSM for initialization. */
218 static void __init prepare_lsm(struct lsm_info *lsm)
220 int enabled = lsm_allowed(lsm);
222 /* Record enablement (to handle any following exclusive LSMs). */
223 set_enabled(lsm, enabled);
225 /* If enabled, do pre-initialization work. */
227 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) {
229 init_debug("exclusive chosen: %s\n", lsm->name);
232 lsm_set_blob_sizes(lsm->blobs);
236 /* Initialize a given LSM, if it is enabled. */
237 static void __init initialize_lsm(struct lsm_info *lsm)
239 if (is_enabled(lsm)) {
242 init_debug("initializing %s\n", lsm->name);
244 WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
248 /* Populate ordered LSMs list from comma-separated LSM name list. */
249 static void __init ordered_lsm_parse(const char *order, const char *origin)
251 struct lsm_info *lsm;
252 char *sep, *name, *next;
254 /* LSM_ORDER_FIRST is always first. */
255 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
256 if (lsm->order == LSM_ORDER_FIRST)
257 append_ordered_lsm(lsm, " first");
260 /* Process "security=", if given. */
261 if (chosen_major_lsm) {
262 struct lsm_info *major;
265 * To match the original "security=" behavior, this
266 * explicitly does NOT fallback to another Legacy Major
267 * if the selected one was separately disabled: disable
268 * all non-matching Legacy Major LSMs.
270 for (major = __start_lsm_info; major < __end_lsm_info;
272 if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
273 strcmp(major->name, chosen_major_lsm) != 0) {
274 set_enabled(major, false);
275 init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
276 chosen_major_lsm, major->name);
281 sep = kstrdup(order, GFP_KERNEL);
283 /* Walk the list, looking for matching LSMs. */
284 while ((name = strsep(&next, ",")) != NULL) {
287 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
288 if (strcmp(lsm->name, name) == 0) {
289 if (lsm->order == LSM_ORDER_MUTABLE)
290 append_ordered_lsm(lsm, origin);
296 init_debug("%s ignored: %s (not built into kernel)\n",
300 /* Process "security=", if given. */
301 if (chosen_major_lsm) {
302 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
303 if (exists_ordered_lsm(lsm))
305 if (strcmp(lsm->name, chosen_major_lsm) == 0)
306 append_ordered_lsm(lsm, "security=");
310 /* LSM_ORDER_LAST is always last. */
311 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
312 if (lsm->order == LSM_ORDER_LAST)
313 append_ordered_lsm(lsm, " last");
316 /* Disable all LSMs not in the ordered list. */
317 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
318 if (exists_ordered_lsm(lsm))
320 set_enabled(lsm, false);
321 init_debug("%s skipped: %s (not in requested order)\n",
328 static void __init lsm_early_cred(struct cred *cred);
329 static void __init lsm_early_task(struct task_struct *task);
331 static int lsm_append(const char *new, char **result);
333 static void __init report_lsm_order(void)
335 struct lsm_info **lsm, *early;
338 pr_info("initializing lsm=");
340 /* Report each enabled LSM name, comma separated. */
341 for (early = __start_early_lsm_info;
342 early < __end_early_lsm_info; early++)
343 if (is_enabled(early))
344 pr_cont("%s%s", first++ == 0 ? "" : ",", early->name);
345 for (lsm = ordered_lsms; *lsm; lsm++)
346 if (is_enabled(*lsm))
347 pr_cont("%s%s", first++ == 0 ? "" : ",", (*lsm)->name);
352 static void __init ordered_lsm_init(void)
354 struct lsm_info **lsm;
356 ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms),
359 if (chosen_lsm_order) {
360 if (chosen_major_lsm) {
361 pr_warn("security=%s is ignored because it is superseded by lsm=%s\n",
362 chosen_major_lsm, chosen_lsm_order);
363 chosen_major_lsm = NULL;
365 ordered_lsm_parse(chosen_lsm_order, "cmdline");
367 ordered_lsm_parse(builtin_lsm_order, "builtin");
369 for (lsm = ordered_lsms; *lsm; lsm++)
374 init_debug("cred blob size = %d\n", blob_sizes.lbs_cred);
375 init_debug("file blob size = %d\n", blob_sizes.lbs_file);
376 init_debug("inode blob size = %d\n", blob_sizes.lbs_inode);
377 init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc);
378 init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg);
379 init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
380 init_debug("task blob size = %d\n", blob_sizes.lbs_task);
383 * Create any kmem_caches needed for blobs
385 if (blob_sizes.lbs_file)
386 lsm_file_cache = kmem_cache_create("lsm_file_cache",
387 blob_sizes.lbs_file, 0,
389 if (blob_sizes.lbs_inode)
390 lsm_inode_cache = kmem_cache_create("lsm_inode_cache",
391 blob_sizes.lbs_inode, 0,
394 lsm_early_cred((struct cred *) current->cred);
395 lsm_early_task(current);
396 for (lsm = ordered_lsms; *lsm; lsm++)
397 initialize_lsm(*lsm);
402 int __init early_security_init(void)
404 struct lsm_info *lsm;
406 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
407 INIT_HLIST_HEAD(&security_hook_heads.NAME);
408 #include "linux/lsm_hook_defs.h"
411 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
413 lsm->enabled = &lsm_enabled_true;
422 * security_init - initializes the security framework
424 * This should be called early in the kernel initialization sequence.
426 int __init security_init(void)
428 struct lsm_info *lsm;
430 init_debug("legacy security=%s\n", chosen_major_lsm ? : " *unspecified*");
431 init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order);
432 init_debug("boot arg lsm=%s\n", chosen_lsm_order ? : " *unspecified*");
435 * Append the names of the early LSM modules now that kmalloc() is
438 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
439 init_debug(" early started: %s (%s)\n", lsm->name,
440 is_enabled(lsm) ? "enabled" : "disabled");
442 lsm_append(lsm->name, &lsm_names);
445 /* Load LSMs in specified order. */
451 /* Save user chosen LSM */
452 static int __init choose_major_lsm(char *str)
454 chosen_major_lsm = str;
457 __setup("security=", choose_major_lsm);
459 /* Explicitly choose LSM initialization order. */
460 static int __init choose_lsm_order(char *str)
462 chosen_lsm_order = str;
465 __setup("lsm=", choose_lsm_order);
467 /* Enable LSM order debugging. */
468 static int __init enable_debug(char *str)
473 __setup("lsm.debug", enable_debug);
475 static bool match_last_lsm(const char *list, const char *lsm)
479 if (WARN_ON(!list || !lsm))
481 last = strrchr(list, ',');
483 /* Pass the comma, strcmp() will check for '\0' */
487 return !strcmp(last, lsm);
490 static int lsm_append(const char *new, char **result)
494 if (*result == NULL) {
495 *result = kstrdup(new, GFP_KERNEL);
499 /* Check if it is the last registered name */
500 if (match_last_lsm(*result, new))
502 cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
512 * security_add_hooks - Add a modules hooks to the hook lists.
513 * @hooks: the hooks to add
514 * @count: the number of hooks to add
515 * @lsm: the name of the security module
517 * Each LSM has to register its hooks with the infrastructure.
519 void __init security_add_hooks(struct security_hook_list *hooks, int count,
524 for (i = 0; i < count; i++) {
526 hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
530 * Don't try to append during early_security_init(), we'll come back
531 * and fix this up afterwards.
533 if (slab_is_available()) {
534 if (lsm_append(lsm, &lsm_names) < 0)
535 panic("%s - Cannot get early memory.\n", __func__);
539 int call_blocking_lsm_notifier(enum lsm_event event, void *data)
541 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain,
544 EXPORT_SYMBOL(call_blocking_lsm_notifier);
546 int register_blocking_lsm_notifier(struct notifier_block *nb)
548 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain,
551 EXPORT_SYMBOL(register_blocking_lsm_notifier);
553 int unregister_blocking_lsm_notifier(struct notifier_block *nb)
555 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain,
558 EXPORT_SYMBOL(unregister_blocking_lsm_notifier);
561 * lsm_cred_alloc - allocate a composite cred blob
562 * @cred: the cred that needs a blob
563 * @gfp: allocation type
565 * Allocate the cred blob for all the modules
567 * Returns 0, or -ENOMEM if memory can't be allocated.
569 static int lsm_cred_alloc(struct cred *cred, gfp_t gfp)
571 if (blob_sizes.lbs_cred == 0) {
572 cred->security = NULL;
576 cred->security = kzalloc(blob_sizes.lbs_cred, gfp);
577 if (cred->security == NULL)
583 * lsm_early_cred - during initialization allocate a composite cred blob
584 * @cred: the cred that needs a blob
586 * Allocate the cred blob for all the modules
588 static void __init lsm_early_cred(struct cred *cred)
590 int rc = lsm_cred_alloc(cred, GFP_KERNEL);
593 panic("%s: Early cred alloc failed.\n", __func__);
597 * lsm_file_alloc - allocate a composite file blob
598 * @file: the file that needs a blob
600 * Allocate the file blob for all the modules
602 * Returns 0, or -ENOMEM if memory can't be allocated.
604 static int lsm_file_alloc(struct file *file)
606 if (!lsm_file_cache) {
607 file->f_security = NULL;
611 file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL);
612 if (file->f_security == NULL)
618 * lsm_inode_alloc - allocate a composite inode blob
619 * @inode: the inode that needs a blob
621 * Allocate the inode blob for all the modules
623 * Returns 0, or -ENOMEM if memory can't be allocated.
625 int lsm_inode_alloc(struct inode *inode)
627 if (!lsm_inode_cache) {
628 inode->i_security = NULL;
632 inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS);
633 if (inode->i_security == NULL)
639 * lsm_task_alloc - allocate a composite task blob
640 * @task: the task that needs a blob
642 * Allocate the task blob for all the modules
644 * Returns 0, or -ENOMEM if memory can't be allocated.
646 static int lsm_task_alloc(struct task_struct *task)
648 if (blob_sizes.lbs_task == 0) {
649 task->security = NULL;
653 task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
654 if (task->security == NULL)
660 * lsm_ipc_alloc - allocate a composite ipc blob
661 * @kip: the ipc that needs a blob
663 * Allocate the ipc blob for all the modules
665 * Returns 0, or -ENOMEM if memory can't be allocated.
667 static int lsm_ipc_alloc(struct kern_ipc_perm *kip)
669 if (blob_sizes.lbs_ipc == 0) {
670 kip->security = NULL;
674 kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL);
675 if (kip->security == NULL)
681 * lsm_msg_msg_alloc - allocate a composite msg_msg blob
682 * @mp: the msg_msg that needs a blob
684 * Allocate the ipc blob for all the modules
686 * Returns 0, or -ENOMEM if memory can't be allocated.
688 static int lsm_msg_msg_alloc(struct msg_msg *mp)
690 if (blob_sizes.lbs_msg_msg == 0) {
695 mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL);
696 if (mp->security == NULL)
702 * lsm_early_task - during initialization allocate a composite task blob
703 * @task: the task that needs a blob
705 * Allocate the task blob for all the modules
707 static void __init lsm_early_task(struct task_struct *task)
709 int rc = lsm_task_alloc(task);
712 panic("%s: Early task alloc failed.\n", __func__);
716 * lsm_superblock_alloc - allocate a composite superblock blob
717 * @sb: the superblock that needs a blob
719 * Allocate the superblock blob for all the modules
721 * Returns 0, or -ENOMEM if memory can't be allocated.
723 static int lsm_superblock_alloc(struct super_block *sb)
725 if (blob_sizes.lbs_superblock == 0) {
726 sb->s_security = NULL;
730 sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL);
731 if (sb->s_security == NULL)
737 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
738 * can be accessed with:
740 * LSM_RET_DEFAULT(<hook_name>)
742 * The macros below define static constants for the default value of each
745 #define LSM_RET_DEFAULT(NAME) (NAME##_default)
746 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
747 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
748 static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
749 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
750 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
752 #include <linux/lsm_hook_defs.h>
756 * Hook list operation macros.
759 * This is a hook that does not return a value.
762 * This is a hook that returns a value.
765 #define call_void_hook(FUNC, ...) \
767 struct security_hook_list *P; \
769 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
770 P->hook.FUNC(__VA_ARGS__); \
773 #define call_int_hook(FUNC, IRC, ...) ({ \
776 struct security_hook_list *P; \
778 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
779 RC = P->hook.FUNC(__VA_ARGS__); \
787 /* Security operations */
790 * security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
791 * @mgr: task credentials of current binder process
793 * Check whether @mgr is allowed to be the binder context manager.
795 * Return: Return 0 if permission is granted.
797 int security_binder_set_context_mgr(const struct cred *mgr)
799 return call_int_hook(binder_set_context_mgr, 0, mgr);
803 * security_binder_transaction() - Check if a binder transaction is allowed
804 * @from: sending process
805 * @to: receiving process
807 * Check whether @from is allowed to invoke a binder transaction call to @to.
809 * Return: Returns 0 if permission is granted.
811 int security_binder_transaction(const struct cred *from,
812 const struct cred *to)
814 return call_int_hook(binder_transaction, 0, from, to);
818 * security_binder_transfer_binder() - Check if a binder transfer is allowed
819 * @from: sending process
820 * @to: receiving process
822 * Check whether @from is allowed to transfer a binder reference to @to.
824 * Return: Returns 0 if permission is granted.
826 int security_binder_transfer_binder(const struct cred *from,
827 const struct cred *to)
829 return call_int_hook(binder_transfer_binder, 0, from, to);
833 * security_binder_transfer_file() - Check if a binder file xfer is allowed
834 * @from: sending process
835 * @to: receiving process
836 * @file: file being transferred
838 * Check whether @from is allowed to transfer @file to @to.
840 * Return: Returns 0 if permission is granted.
842 int security_binder_transfer_file(const struct cred *from,
843 const struct cred *to, struct file *file)
845 return call_int_hook(binder_transfer_file, 0, from, to, file);
849 * security_ptrace_access_check() - Check if tracing is allowed
850 * @child: target process
851 * @mode: PTRACE_MODE flags
853 * Check permission before allowing the current process to trace the @child
854 * process. Security modules may also want to perform a process tracing check
855 * during an execve in the set_security or apply_creds hooks of tracing check
856 * during an execve in the bprm_set_creds hook of binprm_security_ops if the
857 * process is being traced and its security attributes would be changed by the
860 * Return: Returns 0 if permission is granted.
862 int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
864 return call_int_hook(ptrace_access_check, 0, child, mode);
868 * security_ptrace_traceme() - Check if tracing is allowed
869 * @parent: tracing process
871 * Check that the @parent process has sufficient permission to trace the
872 * current process before allowing the current process to present itself to the
873 * @parent process for tracing.
875 * Return: Returns 0 if permission is granted.
877 int security_ptrace_traceme(struct task_struct *parent)
879 return call_int_hook(ptrace_traceme, 0, parent);
883 * security_capget() - Get the capability sets for a process
884 * @target: target process
885 * @effective: effective capability set
886 * @inheritable: inheritable capability set
887 * @permitted: permitted capability set
889 * Get the @effective, @inheritable, and @permitted capability sets for the
890 * @target process. The hook may also perform permission checking to determine
891 * if the current process is allowed to see the capability sets of the @target
894 * Return: Returns 0 if the capability sets were successfully obtained.
896 int security_capget(struct task_struct *target,
897 kernel_cap_t *effective,
898 kernel_cap_t *inheritable,
899 kernel_cap_t *permitted)
901 return call_int_hook(capget, 0, target,
902 effective, inheritable, permitted);
906 * security_capset() - Set the capability sets for a process
907 * @new: new credentials for the target process
908 * @old: current credentials of the target process
909 * @effective: effective capability set
910 * @inheritable: inheritable capability set
911 * @permitted: permitted capability set
913 * Set the @effective, @inheritable, and @permitted capability sets for the
916 * Return: Returns 0 and update @new if permission is granted.
918 int security_capset(struct cred *new, const struct cred *old,
919 const kernel_cap_t *effective,
920 const kernel_cap_t *inheritable,
921 const kernel_cap_t *permitted)
923 return call_int_hook(capset, 0, new, old,
924 effective, inheritable, permitted);
928 * security_capable() - Check if a process has the necessary capability
929 * @cred: credentials to examine
930 * @ns: user namespace
931 * @cap: capability requested
932 * @opts: capability check options
934 * Check whether the @tsk process has the @cap capability in the indicated
935 * credentials. @cap contains the capability <include/linux/capability.h>.
936 * @opts contains options for the capable check <include/linux/security.h>.
938 * Return: Returns 0 if the capability is granted.
940 int security_capable(const struct cred *cred,
941 struct user_namespace *ns,
945 return call_int_hook(capable, 0, cred, ns, cap, opts);
949 * security_quotactl() - Check if a quotactl() syscall is allowed for this fs
955 * Check whether the quotactl syscall is allowed for this @sb.
957 * Return: Returns 0 if permission is granted.
959 int security_quotactl(int cmds, int type, int id, struct super_block *sb)
961 return call_int_hook(quotactl, 0, cmds, type, id, sb);
965 * security_quota_on() - Check if QUOTAON is allowed for a dentry
968 * Check whether QUOTAON is allowed for @dentry.
970 * Return: Returns 0 if permission is granted.
972 int security_quota_on(struct dentry *dentry)
974 return call_int_hook(quota_on, 0, dentry);
978 * security_syslog() - Check if accessing the kernel message ring is allowed
979 * @type: SYSLOG_ACTION_* type
981 * Check permission before accessing the kernel message ring or changing
982 * logging to the console. See the syslog(2) manual page for an explanation of
985 * Return: Return 0 if permission is granted.
987 int security_syslog(int type)
989 return call_int_hook(syslog, 0, type);
993 * security_settime64() - Check if changing the system time is allowed
997 * Check permission to change the system time, struct timespec64 is defined in
998 * <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
1000 * Return: Returns 0 if permission is granted.
1002 int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
1004 return call_int_hook(settime, 0, ts, tz);
1008 * security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
1010 * @pages: number of pages
1012 * Check permissions for allocating a new virtual mapping. If all LSMs return
1013 * a positive value, __vm_enough_memory() will be called with cap_sys_admin
1014 * set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
1015 * called with cap_sys_admin cleared.
1017 * Return: Returns 0 if permission is granted by the LSM infrastructure to the
1020 int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
1022 struct security_hook_list *hp;
1023 int cap_sys_admin = 1;
1027 * The module will respond with a positive value if
1028 * it thinks the __vm_enough_memory() call should be
1029 * made with the cap_sys_admin set. If all of the modules
1030 * agree that it should be set it will. If any module
1031 * thinks it should not be set it won't.
1033 hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
1034 rc = hp->hook.vm_enough_memory(mm, pages);
1040 return __vm_enough_memory(mm, pages, cap_sys_admin);
1044 * security_bprm_creds_for_exec() - Prepare the credentials for exec()
1045 * @bprm: binary program information
1047 * If the setup in prepare_exec_creds did not setup @bprm->cred->security
1048 * properly for executing @bprm->file, update the LSM's portion of
1049 * @bprm->cred->security to be what commit_creds needs to install for the new
1050 * program. This hook may also optionally check permissions (e.g. for
1051 * transitions between security domains). The hook must set @bprm->secureexec
1052 * to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
1053 * contains the linux_binprm structure.
1055 * Return: Returns 0 if the hook is successful and permission is granted.
1057 int security_bprm_creds_for_exec(struct linux_binprm *bprm)
1059 return call_int_hook(bprm_creds_for_exec, 0, bprm);
1063 * security_bprm_creds_from_file() - Update linux_binprm creds based on file
1064 * @bprm: binary program information
1065 * @file: associated file
1067 * If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
1068 * exec, update @bprm->cred to reflect that change. This is called after
1069 * finding the binary that will be executed without an interpreter. This
1070 * ensures that the credentials will not be derived from a script that the
1071 * binary will need to reopen, which when reopend may end up being a completely
1072 * different file. This hook may also optionally check permissions (e.g. for
1073 * transitions between security domains). The hook must set @bprm->secureexec
1074 * to 1 if AT_SECURE should be set to request libc enable secure mode. The
1075 * hook must add to @bprm->per_clear any personality flags that should be
1076 * cleared from current->personality. @bprm contains the linux_binprm
1079 * Return: Returns 0 if the hook is successful and permission is granted.
1081 int security_bprm_creds_from_file(struct linux_binprm *bprm, struct file *file)
1083 return call_int_hook(bprm_creds_from_file, 0, bprm, file);
1087 * security_bprm_check() - Mediate binary handler search
1088 * @bprm: binary program information
1090 * This hook mediates the point when a search for a binary handler will begin.
1091 * It allows a check against the @bprm->cred->security value which was set in
1092 * the preceding creds_for_exec call. The argv list and envp list are reliably
1093 * available in @bprm. This hook may be called multiple times during a single
1094 * execve. @bprm contains the linux_binprm structure.
1096 * Return: Returns 0 if the hook is successful and permission is granted.
1098 int security_bprm_check(struct linux_binprm *bprm)
1102 ret = call_int_hook(bprm_check_security, 0, bprm);
1105 return ima_bprm_check(bprm);
1109 * security_bprm_committing_creds() - Install creds for a process during exec()
1110 * @bprm: binary program information
1112 * Prepare to install the new security attributes of a process being
1113 * transformed by an execve operation, based on the old credentials pointed to
1114 * by @current->cred and the information set in @bprm->cred by the
1115 * bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
1116 * hook is a good place to perform state changes on the process such as closing
1117 * open file descriptors to which access will no longer be granted when the
1118 * attributes are changed. This is called immediately before commit_creds().
1120 void security_bprm_committing_creds(struct linux_binprm *bprm)
1122 call_void_hook(bprm_committing_creds, bprm);
1126 * security_bprm_committed_creds() - Tidy up after cred install during exec()
1127 * @bprm: binary program information
1129 * Tidy up after the installation of the new security attributes of a process
1130 * being transformed by an execve operation. The new credentials have, by this
1131 * point, been set to @current->cred. @bprm points to the linux_binprm
1132 * structure. This hook is a good place to perform state changes on the
1133 * process such as clearing out non-inheritable signal state. This is called
1134 * immediately after commit_creds().
1136 void security_bprm_committed_creds(struct linux_binprm *bprm)
1138 call_void_hook(bprm_committed_creds, bprm);
1142 * security_fs_context_submount() - Initialise fc->security
1143 * @fc: new filesystem context
1144 * @reference: dentry reference for submount/remount
1146 * Fill out the ->security field for a new fs_context.
1148 * Return: Returns 0 on success or negative error code on failure.
1150 int security_fs_context_submount(struct fs_context *fc, struct super_block *reference)
1152 return call_int_hook(fs_context_submount, 0, fc, reference);
1156 * security_fs_context_dup() - Duplicate a fs_context LSM blob
1157 * @fc: destination filesystem context
1158 * @src_fc: source filesystem context
1160 * Allocate and attach a security structure to sc->security. This pointer is
1161 * initialised to NULL by the caller. @fc indicates the new filesystem context.
1162 * @src_fc indicates the original filesystem context.
1164 * Return: Returns 0 on success or a negative error code on failure.
1166 int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1168 return call_int_hook(fs_context_dup, 0, fc, src_fc);
1172 * security_fs_context_parse_param() - Configure a filesystem context
1173 * @fc: filesystem context
1174 * @param: filesystem parameter
1176 * Userspace provided a parameter to configure a superblock. The LSM can
1177 * consume the parameter or return it to the caller for use elsewhere.
1179 * Return: If the parameter is used by the LSM it should return 0, if it is
1180 * returned to the caller -ENOPARAM is returned, otherwise a negative
1181 * error code is returned.
1183 int security_fs_context_parse_param(struct fs_context *fc,
1184 struct fs_parameter *param)
1186 struct security_hook_list *hp;
1190 hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param,
1192 trc = hp->hook.fs_context_parse_param(fc, param);
1195 else if (trc != -ENOPARAM)
1202 * security_sb_alloc() - Allocate a super_block LSM blob
1203 * @sb: filesystem superblock
1205 * Allocate and attach a security structure to the sb->s_security field. The
1206 * s_security field is initialized to NULL when the structure is allocated.
1207 * @sb contains the super_block structure to be modified.
1209 * Return: Returns 0 if operation was successful.
1211 int security_sb_alloc(struct super_block *sb)
1213 int rc = lsm_superblock_alloc(sb);
1217 rc = call_int_hook(sb_alloc_security, 0, sb);
1219 security_sb_free(sb);
1224 * security_sb_delete() - Release super_block LSM associated objects
1225 * @sb: filesystem superblock
1227 * Release objects tied to a superblock (e.g. inodes). @sb contains the
1228 * super_block structure being released.
1230 void security_sb_delete(struct super_block *sb)
1232 call_void_hook(sb_delete, sb);
1236 * security_sb_free() - Free a super_block LSM blob
1237 * @sb: filesystem superblock
1239 * Deallocate and clear the sb->s_security field. @sb contains the super_block
1240 * structure to be modified.
1242 void security_sb_free(struct super_block *sb)
1244 call_void_hook(sb_free_security, sb);
1245 kfree(sb->s_security);
1246 sb->s_security = NULL;
1250 * security_free_mnt_opts() - Free memory associated with mount options
1251 * @mnt_opts: LSM processed mount options
1253 * Free memory associated with @mnt_ops.
1255 void security_free_mnt_opts(void **mnt_opts)
1259 call_void_hook(sb_free_mnt_opts, *mnt_opts);
1262 EXPORT_SYMBOL(security_free_mnt_opts);
1265 * security_sb_eat_lsm_opts() - Consume LSM mount options
1266 * @options: mount options
1267 * @mnt_opts: LSM processed mount options
1269 * Eat (scan @options) and save them in @mnt_opts.
1271 * Return: Returns 0 on success, negative values on failure.
1273 int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
1275 return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts);
1277 EXPORT_SYMBOL(security_sb_eat_lsm_opts);
1280 * security_sb_mnt_opts_compat() - Check if new mount options are allowed
1281 * @sb: filesystem superblock
1282 * @mnt_opts: new mount options
1284 * Determine if the new mount options in @mnt_opts are allowed given the
1285 * existing mounted filesystem at @sb. @sb superblock being compared.
1287 * Return: Returns 0 if options are compatible.
1289 int security_sb_mnt_opts_compat(struct super_block *sb,
1292 return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts);
1294 EXPORT_SYMBOL(security_sb_mnt_opts_compat);
1297 * security_sb_remount() - Verify no incompatible mount changes during remount
1298 * @sb: filesystem superblock
1299 * @mnt_opts: (re)mount options
1301 * Extracts security system specific mount options and verifies no changes are
1302 * being made to those options.
1304 * Return: Returns 0 if permission is granted.
1306 int security_sb_remount(struct super_block *sb,
1309 return call_int_hook(sb_remount, 0, sb, mnt_opts);
1311 EXPORT_SYMBOL(security_sb_remount);
1314 * security_sb_kern_mount() - Check if a kernel mount is allowed
1315 * @sb: filesystem superblock
1317 * Mount this @sb if allowed by permissions.
1319 * Return: Returns 0 if permission is granted.
1321 int security_sb_kern_mount(struct super_block *sb)
1323 return call_int_hook(sb_kern_mount, 0, sb);
1327 * security_sb_show_options() - Output the mount options for a superblock
1329 * @sb: filesystem superblock
1331 * Show (print on @m) mount options for this @sb.
1333 * Return: Returns 0 on success, negative values on failure.
1335 int security_sb_show_options(struct seq_file *m, struct super_block *sb)
1337 return call_int_hook(sb_show_options, 0, m, sb);
1341 * security_sb_statfs() - Check if accessing fs stats is allowed
1342 * @dentry: superblock handle
1344 * Check permission before obtaining filesystem statistics for the @mnt
1345 * mountpoint. @dentry is a handle on the superblock for the filesystem.
1347 * Return: Returns 0 if permission is granted.
1349 int security_sb_statfs(struct dentry *dentry)
1351 return call_int_hook(sb_statfs, 0, dentry);
1355 * security_sb_mount() - Check permission for mounting a filesystem
1356 * @dev_name: filesystem backing device
1357 * @path: mount point
1358 * @type: filesystem type
1359 * @flags: mount flags
1360 * @data: filesystem specific data
1362 * Check permission before an object specified by @dev_name is mounted on the
1363 * mount point named by @nd. For an ordinary mount, @dev_name identifies a
1364 * device if the file system type requires a device. For a remount
1365 * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
1366 * (@flags & MS_BIND), @dev_name identifies the pathname of the object being
1369 * Return: Returns 0 if permission is granted.
1371 int security_sb_mount(const char *dev_name, const struct path *path,
1372 const char *type, unsigned long flags, void *data)
1374 return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data);
1378 * security_sb_umount() - Check permission for unmounting a filesystem
1379 * @mnt: mounted filesystem
1380 * @flags: unmount flags
1382 * Check permission before the @mnt file system is unmounted.
1384 * Return: Returns 0 if permission is granted.
1386 int security_sb_umount(struct vfsmount *mnt, int flags)
1388 return call_int_hook(sb_umount, 0, mnt, flags);
1392 * security_sb_pivotroot() - Check permissions for pivoting the rootfs
1393 * @old_path: new location for current rootfs
1394 * @new_path: location of the new rootfs
1396 * Check permission before pivoting the root filesystem.
1398 * Return: Returns 0 if permission is granted.
1400 int security_sb_pivotroot(const struct path *old_path,
1401 const struct path *new_path)
1403 return call_int_hook(sb_pivotroot, 0, old_path, new_path);
1407 * security_sb_set_mnt_opts() - Set the mount options for a filesystem
1408 * @sb: filesystem superblock
1409 * @mnt_opts: binary mount options
1410 * @kern_flags: kernel flags (in)
1411 * @set_kern_flags: kernel flags (out)
1413 * Set the security relevant mount options used for a superblock.
1415 * Return: Returns 0 on success, error on failure.
1417 int security_sb_set_mnt_opts(struct super_block *sb,
1419 unsigned long kern_flags,
1420 unsigned long *set_kern_flags)
1422 return call_int_hook(sb_set_mnt_opts,
1423 mnt_opts ? -EOPNOTSUPP : 0, sb,
1424 mnt_opts, kern_flags, set_kern_flags);
1426 EXPORT_SYMBOL(security_sb_set_mnt_opts);
1429 * security_sb_clone_mnt_opts() - Duplicate superblock mount options
1430 * @oldsb: source superblock
1431 * @newsb: destination superblock
1432 * @kern_flags: kernel flags (in)
1433 * @set_kern_flags: kernel flags (out)
1435 * Copy all security options from a given superblock to another.
1437 * Return: Returns 0 on success, error on failure.
1439 int security_sb_clone_mnt_opts(const struct super_block *oldsb,
1440 struct super_block *newsb,
1441 unsigned long kern_flags,
1442 unsigned long *set_kern_flags)
1444 return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb,
1445 kern_flags, set_kern_flags);
1447 EXPORT_SYMBOL(security_sb_clone_mnt_opts);
1450 * security_move_mount() - Check permissions for moving a mount
1451 * @from_path: source mount point
1452 * @to_path: destination mount point
1454 * Check permission before a mount is moved.
1456 * Return: Returns 0 if permission is granted.
1458 int security_move_mount(const struct path *from_path,
1459 const struct path *to_path)
1461 return call_int_hook(move_mount, 0, from_path, to_path);
1465 * security_path_notify() - Check if setting a watch is allowed
1468 * @obj_type: file path type
1470 * Check permissions before setting a watch on events as defined by @mask, on
1471 * an object at @path, whose type is defined by @obj_type.
1473 * Return: Returns 0 if permission is granted.
1475 int security_path_notify(const struct path *path, u64 mask,
1476 unsigned int obj_type)
1478 return call_int_hook(path_notify, 0, path, mask, obj_type);
1482 * security_inode_alloc() - Allocate an inode LSM blob
1485 * Allocate and attach a security structure to @inode->i_security. The
1486 * i_security field is initialized to NULL when the inode structure is
1489 * Return: Return 0 if operation was successful.
1491 int security_inode_alloc(struct inode *inode)
1493 int rc = lsm_inode_alloc(inode);
1497 rc = call_int_hook(inode_alloc_security, 0, inode);
1499 security_inode_free(inode);
1503 static void inode_free_by_rcu(struct rcu_head *head)
1506 * The rcu head is at the start of the inode blob
1508 kmem_cache_free(lsm_inode_cache, head);
1512 * security_inode_free() - Free an inode's LSM blob
1515 * Deallocate the inode security structure and set @inode->i_security to NULL.
1517 void security_inode_free(struct inode *inode)
1519 integrity_inode_free(inode);
1520 call_void_hook(inode_free_security, inode);
1522 * The inode may still be referenced in a path walk and
1523 * a call to security_inode_permission() can be made
1524 * after inode_free_security() is called. Ideally, the VFS
1525 * wouldn't do this, but fixing that is a much harder
1526 * job. For now, simply free the i_security via RCU, and
1527 * leave the current inode->i_security pointer intact.
1528 * The inode will be freed after the RCU grace period too.
1530 if (inode->i_security)
1531 call_rcu((struct rcu_head *)inode->i_security,
1536 * security_dentry_init_security() - Perform dentry initialization
1537 * @dentry: the dentry to initialize
1538 * @mode: mode used to determine resource type
1539 * @name: name of the last path component
1540 * @xattr_name: name of the security/LSM xattr
1541 * @ctx: pointer to the resulting LSM context
1542 * @ctxlen: length of @ctx
1544 * Compute a context for a dentry as the inode is not yet available since NFSv4
1545 * has no label backed by an EA anyway. It is important to note that
1546 * @xattr_name does not need to be free'd by the caller, it is a static string.
1548 * Return: Returns 0 on success, negative values on failure.
1550 int security_dentry_init_security(struct dentry *dentry, int mode,
1551 const struct qstr *name,
1552 const char **xattr_name, void **ctx,
1555 struct security_hook_list *hp;
1559 * Only one module will provide a security context.
1561 hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security,
1563 rc = hp->hook.dentry_init_security(dentry, mode, name,
1564 xattr_name, ctx, ctxlen);
1565 if (rc != LSM_RET_DEFAULT(dentry_init_security))
1568 return LSM_RET_DEFAULT(dentry_init_security);
1570 EXPORT_SYMBOL(security_dentry_init_security);
1573 * security_dentry_create_files_as() - Perform dentry initialization
1574 * @dentry: the dentry to initialize
1575 * @mode: mode used to determine resource type
1576 * @name: name of the last path component
1577 * @old: creds to use for LSM context calculations
1578 * @new: creds to modify
1580 * Compute a context for a dentry as the inode is not yet available and set
1581 * that context in passed in creds so that new files are created using that
1582 * context. Context is calculated using the passed in creds and not the creds
1585 * Return: Returns 0 on success, error on failure.
1587 int security_dentry_create_files_as(struct dentry *dentry, int mode,
1589 const struct cred *old, struct cred *new)
1591 return call_int_hook(dentry_create_files_as, 0, dentry, mode,
1594 EXPORT_SYMBOL(security_dentry_create_files_as);
1597 * security_inode_init_security() - Initialize an inode's LSM context
1599 * @dir: parent directory
1600 * @qstr: last component of the pathname
1601 * @initxattrs: callback function to write xattrs
1602 * @fs_data: filesystem specific data
1604 * Obtain the security attribute name suffix and value to set on a newly
1605 * created inode and set up the incore security field for the new inode. This
1606 * hook is called by the fs code as part of the inode creation transaction and
1607 * provides for atomic labeling of the inode, unlike the post_create/mkdir/...
1608 * hooks called by the VFS. The hook function is expected to allocate the name
1609 * and value via kmalloc, with the caller being responsible for calling kfree
1610 * after using them. If the security module does not use security attributes
1611 * or does not wish to put a security attribute on this particular inode, then
1612 * it should return -EOPNOTSUPP to skip this processing.
1614 * Return: Returns 0 on success, -EOPNOTSUPP if no security attribute is
1615 * needed, or -ENOMEM on memory allocation failure.
1617 int security_inode_init_security(struct inode *inode, struct inode *dir,
1618 const struct qstr *qstr,
1619 const initxattrs initxattrs, void *fs_data)
1621 struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1];
1622 struct xattr *lsm_xattr, *evm_xattr, *xattr;
1625 if (unlikely(IS_PRIVATE(inode)))
1629 return call_int_hook(inode_init_security, -EOPNOTSUPP, inode,
1630 dir, qstr, NULL, NULL, NULL);
1631 memset(new_xattrs, 0, sizeof(new_xattrs));
1632 lsm_xattr = new_xattrs;
1633 ret = call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir, qstr,
1636 &lsm_xattr->value_len);
1640 evm_xattr = lsm_xattr + 1;
1641 ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr);
1644 ret = initxattrs(inode, new_xattrs, fs_data);
1646 for (xattr = new_xattrs; xattr->value != NULL; xattr++)
1647 kfree(xattr->value);
1648 return (ret == -EOPNOTSUPP) ? 0 : ret;
1650 EXPORT_SYMBOL(security_inode_init_security);
1653 * security_inode_init_security_anon() - Initialize an anonymous inode
1655 * @name: the anonymous inode class
1656 * @context_inode: an optional related inode
1658 * Set up the incore security field for the new anonymous inode and return
1659 * whether the inode creation is permitted by the security module or not.
1661 * Return: Returns 0 on success, -EACCES if the security module denies the
1662 * creation of this inode, or another -errno upon other errors.
1664 int security_inode_init_security_anon(struct inode *inode,
1665 const struct qstr *name,
1666 const struct inode *context_inode)
1668 return call_int_hook(inode_init_security_anon, 0, inode, name,
1672 #ifdef CONFIG_SECURITY_PATH
1674 * security_path_mknod() - Check if creating a special file is allowed
1675 * @dir: parent directory
1677 * @mode: new file mode
1678 * @dev: device number
1680 * Check permissions when creating a file. Note that this hook is called even
1681 * if mknod operation is being done for a regular file.
1683 * Return: Returns 0 if permission is granted.
1685 int security_path_mknod(const struct path *dir, struct dentry *dentry,
1686 umode_t mode, unsigned int dev)
1688 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1690 return call_int_hook(path_mknod, 0, dir, dentry, mode, dev);
1692 EXPORT_SYMBOL(security_path_mknod);
1695 * security_path_mkdir() - Check if creating a new directory is allowed
1696 * @dir: parent directory
1697 * @dentry: new directory
1698 * @mode: new directory mode
1700 * Check permissions to create a new directory in the existing directory.
1702 * Return: Returns 0 if permission is granted.
1704 int security_path_mkdir(const struct path *dir, struct dentry *dentry,
1707 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1709 return call_int_hook(path_mkdir, 0, dir, dentry, mode);
1711 EXPORT_SYMBOL(security_path_mkdir);
1714 * security_path_rmdir() - Check if removing a directory is allowed
1715 * @dir: parent directory
1716 * @dentry: directory to remove
1718 * Check the permission to remove a directory.
1720 * Return: Returns 0 if permission is granted.
1722 int security_path_rmdir(const struct path *dir, struct dentry *dentry)
1724 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1726 return call_int_hook(path_rmdir, 0, dir, dentry);
1730 * security_path_unlink() - Check if removing a hard link is allowed
1731 * @dir: parent directory
1734 * Check the permission to remove a hard link to a file.
1736 * Return: Returns 0 if permission is granted.
1738 int security_path_unlink(const struct path *dir, struct dentry *dentry)
1740 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1742 return call_int_hook(path_unlink, 0, dir, dentry);
1744 EXPORT_SYMBOL(security_path_unlink);
1747 * security_path_symlink() - Check if creating a symbolic link is allowed
1748 * @dir: parent directory
1749 * @dentry: symbolic link
1750 * @old_name: file pathname
1752 * Check the permission to create a symbolic link to a file.
1754 * Return: Returns 0 if permission is granted.
1756 int security_path_symlink(const struct path *dir, struct dentry *dentry,
1757 const char *old_name)
1759 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1761 return call_int_hook(path_symlink, 0, dir, dentry, old_name);
1765 * security_path_link - Check if creating a hard link is allowed
1766 * @old_dentry: existing file
1767 * @new_dir: new parent directory
1768 * @new_dentry: new link
1770 * Check permission before creating a new hard link to a file.
1772 * Return: Returns 0 if permission is granted.
1774 int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
1775 struct dentry *new_dentry)
1777 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
1779 return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry);
1783 * security_path_rename() - Check if renaming a file is allowed
1784 * @old_dir: parent directory of the old file
1785 * @old_dentry: the old file
1786 * @new_dir: parent directory of the new file
1787 * @new_dentry: the new file
1790 * Check for permission to rename a file or directory.
1792 * Return: Returns 0 if permission is granted.
1794 int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
1795 const struct path *new_dir, struct dentry *new_dentry,
1798 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
1799 (d_is_positive(new_dentry) &&
1800 IS_PRIVATE(d_backing_inode(new_dentry)))))
1803 return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir,
1806 EXPORT_SYMBOL(security_path_rename);
1809 * security_path_truncate() - Check if truncating a file is allowed
1812 * Check permission before truncating the file indicated by path. Note that
1813 * truncation permissions may also be checked based on already opened files,
1814 * using the security_file_truncate() hook.
1816 * Return: Returns 0 if permission is granted.
1818 int security_path_truncate(const struct path *path)
1820 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1822 return call_int_hook(path_truncate, 0, path);
1826 * security_path_chmod() - Check if changing the file's mode is allowed
1830 * Check for permission to change a mode of the file @path. The new mode is
1831 * specified in @mode which is a bitmask of constants from
1832 * <include/uapi/linux/stat.h>.
1834 * Return: Returns 0 if permission is granted.
1836 int security_path_chmod(const struct path *path, umode_t mode)
1838 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1840 return call_int_hook(path_chmod, 0, path, mode);
1844 * security_path_chown() - Check if changing the file's owner/group is allowed
1849 * Check for permission to change owner/group of a file or directory.
1851 * Return: Returns 0 if permission is granted.
1853 int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
1855 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1857 return call_int_hook(path_chown, 0, path, uid, gid);
1861 * security_path_chroot() - Check if changing the root directory is allowed
1864 * Check for permission to change root directory.
1866 * Return: Returns 0 if permission is granted.
1868 int security_path_chroot(const struct path *path)
1870 return call_int_hook(path_chroot, 0, path);
1872 #endif /* CONFIG_SECURITY_PATH */
1875 * security_inode_create() - Check if creating a file is allowed
1876 * @dir: the parent directory
1877 * @dentry: the file being created
1878 * @mode: requested file mode
1880 * Check permission to create a regular file.
1882 * Return: Returns 0 if permission is granted.
1884 int security_inode_create(struct inode *dir, struct dentry *dentry,
1887 if (unlikely(IS_PRIVATE(dir)))
1889 return call_int_hook(inode_create, 0, dir, dentry, mode);
1891 EXPORT_SYMBOL_GPL(security_inode_create);
1894 * security_inode_link() - Check if creating a hard link is allowed
1895 * @old_dentry: existing file
1896 * @dir: new parent directory
1897 * @new_dentry: new link
1899 * Check permission before creating a new hard link to a file.
1901 * Return: Returns 0 if permission is granted.
1903 int security_inode_link(struct dentry *old_dentry, struct inode *dir,
1904 struct dentry *new_dentry)
1906 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
1908 return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry);
1912 * security_inode_unlink() - Check if removing a hard link is allowed
1913 * @dir: parent directory
1916 * Check the permission to remove a hard link to a file.
1918 * Return: Returns 0 if permission is granted.
1920 int security_inode_unlink(struct inode *dir, struct dentry *dentry)
1922 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
1924 return call_int_hook(inode_unlink, 0, dir, dentry);
1928 * security_inode_symlink() - Check if creating a symbolic link is allowed
1929 * @dir: parent directory
1930 * @dentry: symbolic link
1931 * @old_name: existing filename
1933 * Check the permission to create a symbolic link to a file.
1935 * Return: Returns 0 if permission is granted.
1937 int security_inode_symlink(struct inode *dir, struct dentry *dentry,
1938 const char *old_name)
1940 if (unlikely(IS_PRIVATE(dir)))
1942 return call_int_hook(inode_symlink, 0, dir, dentry, old_name);
1946 * security_inode_mkdir() - Check if creation a new director is allowed
1947 * @dir: parent directory
1948 * @dentry: new directory
1949 * @mode: new directory mode
1951 * Check permissions to create a new directory in the existing directory
1952 * associated with inode structure @dir.
1954 * Return: Returns 0 if permission is granted.
1956 int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1958 if (unlikely(IS_PRIVATE(dir)))
1960 return call_int_hook(inode_mkdir, 0, dir, dentry, mode);
1962 EXPORT_SYMBOL_GPL(security_inode_mkdir);
1965 * security_inode_rmdir() - Check if removing a directory is allowed
1966 * @dir: parent directory
1967 * @dentry: directory to be removed
1969 * Check the permission to remove a directory.
1971 * Return: Returns 0 if permission is granted.
1973 int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
1975 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
1977 return call_int_hook(inode_rmdir, 0, dir, dentry);
1981 * security_inode_mknod() - Check if creating a special file is allowed
1982 * @dir: parent directory
1984 * @mode: new file mode
1985 * @dev: device number
1987 * Check permissions when creating a special file (or a socket or a fifo file
1988 * created via the mknod system call). Note that if mknod operation is being
1989 * done for a regular file, then the create hook will be called and not this
1992 * Return: Returns 0 if permission is granted.
1994 int security_inode_mknod(struct inode *dir, struct dentry *dentry,
1995 umode_t mode, dev_t dev)
1997 if (unlikely(IS_PRIVATE(dir)))
1999 return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev);
2003 * security_inode_rename() - Check if renaming a file is allowed
2004 * @old_dir: parent directory of the old file
2005 * @old_dentry: the old file
2006 * @new_dir: parent directory of the new file
2007 * @new_dentry: the new file
2010 * Check for permission to rename a file or directory.
2012 * Return: Returns 0 if permission is granted.
2014 int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
2015 struct inode *new_dir, struct dentry *new_dentry,
2018 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
2019 (d_is_positive(new_dentry) &&
2020 IS_PRIVATE(d_backing_inode(new_dentry)))))
2023 if (flags & RENAME_EXCHANGE) {
2024 int err = call_int_hook(inode_rename, 0, new_dir, new_dentry,
2025 old_dir, old_dentry);
2030 return call_int_hook(inode_rename, 0, old_dir, old_dentry,
2031 new_dir, new_dentry);
2035 * security_inode_readlink() - Check if reading a symbolic link is allowed
2038 * Check the permission to read the symbolic link.
2040 * Return: Returns 0 if permission is granted.
2042 int security_inode_readlink(struct dentry *dentry)
2044 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2046 return call_int_hook(inode_readlink, 0, dentry);
2050 * security_inode_follow_link() - Check if following a symbolic link is allowed
2051 * @dentry: link dentry
2052 * @inode: link inode
2053 * @rcu: true if in RCU-walk mode
2055 * Check permission to follow a symbolic link when looking up a pathname. If
2056 * @rcu is true, @inode is not stable.
2058 * Return: Returns 0 if permission is granted.
2060 int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
2063 if (unlikely(IS_PRIVATE(inode)))
2065 return call_int_hook(inode_follow_link, 0, dentry, inode, rcu);
2069 * security_inode_permission() - Check if accessing an inode is allowed
2071 * @mask: access mask
2073 * Check permission before accessing an inode. This hook is called by the
2074 * existing Linux permission function, so a security module can use it to
2075 * provide additional checking for existing Linux permission checks. Notice
2076 * that this hook is called when a file is opened (as well as many other
2077 * operations), whereas the file_security_ops permission hook is called when
2078 * the actual read/write operations are performed.
2080 * Return: Returns 0 if permission is granted.
2082 int security_inode_permission(struct inode *inode, int mask)
2084 if (unlikely(IS_PRIVATE(inode)))
2086 return call_int_hook(inode_permission, 0, inode, mask);
2090 * security_inode_setattr() - Check if setting file attributes is allowed
2091 * @idmap: idmap of the mount
2093 * @attr: new attributes
2095 * Check permission before setting file attributes. Note that the kernel call
2096 * to notify_change is performed from several locations, whenever file
2097 * attributes change (such as when a file is truncated, chown/chmod operations,
2098 * transferring disk quotas, etc).
2100 * Return: Returns 0 if permission is granted.
2102 int security_inode_setattr(struct mnt_idmap *idmap,
2103 struct dentry *dentry, struct iattr *attr)
2107 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2109 ret = call_int_hook(inode_setattr, 0, dentry, attr);
2112 return evm_inode_setattr(idmap, dentry, attr);
2114 EXPORT_SYMBOL_GPL(security_inode_setattr);
2117 * security_inode_getattr() - Check if getting file attributes is allowed
2120 * Check permission before obtaining file attributes.
2122 * Return: Returns 0 if permission is granted.
2124 int security_inode_getattr(const struct path *path)
2126 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
2128 return call_int_hook(inode_getattr, 0, path);
2132 * security_inode_setxattr() - Check if setting file xattrs is allowed
2133 * @idmap: idmap of the mount
2136 * @value: xattr value
2137 * @size: size of xattr value
2140 * Check permission before setting the extended attributes.
2142 * Return: Returns 0 if permission is granted.
2144 int security_inode_setxattr(struct mnt_idmap *idmap,
2145 struct dentry *dentry, const char *name,
2146 const void *value, size_t size, int flags)
2150 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2153 * SELinux and Smack integrate the cap call,
2154 * so assume that all LSMs supplying this call do so.
2156 ret = call_int_hook(inode_setxattr, 1, idmap, dentry, name, value,
2160 ret = cap_inode_setxattr(dentry, name, value, size, flags);
2163 ret = ima_inode_setxattr(dentry, name, value, size);
2166 return evm_inode_setxattr(idmap, dentry, name, value, size);
2170 * security_inode_set_acl() - Check if setting posix acls is allowed
2171 * @idmap: idmap of the mount
2173 * @acl_name: acl name
2176 * Check permission before setting posix acls, the posix acls in @kacl are
2177 * identified by @acl_name.
2179 * Return: Returns 0 if permission is granted.
2181 int security_inode_set_acl(struct mnt_idmap *idmap,
2182 struct dentry *dentry, const char *acl_name,
2183 struct posix_acl *kacl)
2187 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2189 ret = call_int_hook(inode_set_acl, 0, idmap, dentry, acl_name,
2193 ret = ima_inode_set_acl(idmap, dentry, acl_name, kacl);
2196 return evm_inode_set_acl(idmap, dentry, acl_name, kacl);
2200 * security_inode_get_acl() - Check if reading posix acls is allowed
2201 * @idmap: idmap of the mount
2203 * @acl_name: acl name
2205 * Check permission before getting osix acls, the posix acls are identified by
2208 * Return: Returns 0 if permission is granted.
2210 int security_inode_get_acl(struct mnt_idmap *idmap,
2211 struct dentry *dentry, const char *acl_name)
2213 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2215 return call_int_hook(inode_get_acl, 0, idmap, dentry, acl_name);
2219 * security_inode_remove_acl() - Check if removing a posix acl is allowed
2220 * @idmap: idmap of the mount
2222 * @acl_name: acl name
2224 * Check permission before removing posix acls, the posix acls are identified
2227 * Return: Returns 0 if permission is granted.
2229 int security_inode_remove_acl(struct mnt_idmap *idmap,
2230 struct dentry *dentry, const char *acl_name)
2234 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2236 ret = call_int_hook(inode_remove_acl, 0, idmap, dentry, acl_name);
2239 ret = ima_inode_remove_acl(idmap, dentry, acl_name);
2242 return evm_inode_remove_acl(idmap, dentry, acl_name);
2246 * security_inode_post_setxattr() - Update the inode after a setxattr operation
2249 * @value: xattr value
2250 * @size: xattr value size
2253 * Update inode security field after successful setxattr operation.
2255 void security_inode_post_setxattr(struct dentry *dentry, const char *name,
2256 const void *value, size_t size, int flags)
2258 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2260 call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
2261 evm_inode_post_setxattr(dentry, name, value, size);
2265 * security_inode_getxattr() - Check if xattr access is allowed
2269 * Check permission before obtaining the extended attributes identified by
2270 * @name for @dentry.
2272 * Return: Returns 0 if permission is granted.
2274 int security_inode_getxattr(struct dentry *dentry, const char *name)
2276 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2278 return call_int_hook(inode_getxattr, 0, dentry, name);
2282 * security_inode_listxattr() - Check if listing xattrs is allowed
2285 * Check permission before obtaining the list of extended attribute names for
2288 * Return: Returns 0 if permission is granted.
2290 int security_inode_listxattr(struct dentry *dentry)
2292 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2294 return call_int_hook(inode_listxattr, 0, dentry);
2298 * security_inode_removexattr() - Check if removing an xattr is allowed
2299 * @idmap: idmap of the mount
2303 * Check permission before removing the extended attribute identified by @name
2306 * Return: Returns 0 if permission is granted.
2308 int security_inode_removexattr(struct mnt_idmap *idmap,
2309 struct dentry *dentry, const char *name)
2313 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2316 * SELinux and Smack integrate the cap call,
2317 * so assume that all LSMs supplying this call do so.
2319 ret = call_int_hook(inode_removexattr, 1, idmap, dentry, name);
2321 ret = cap_inode_removexattr(idmap, dentry, name);
2324 ret = ima_inode_removexattr(dentry, name);
2327 return evm_inode_removexattr(idmap, dentry, name);
2331 * security_inode_need_killpriv() - Check if security_inode_killpriv() required
2332 * @dentry: associated dentry
2334 * Called when an inode has been changed to determine if
2335 * security_inode_killpriv() should be called.
2337 * Return: Return <0 on error to abort the inode change operation, return 0 if
2338 * security_inode_killpriv() does not need to be called, return >0 if
2339 * security_inode_killpriv() does need to be called.
2341 int security_inode_need_killpriv(struct dentry *dentry)
2343 return call_int_hook(inode_need_killpriv, 0, dentry);
2347 * security_inode_killpriv() - The setuid bit is removed, update LSM state
2348 * @idmap: idmap of the mount
2349 * @dentry: associated dentry
2351 * The @dentry's setuid bit is being removed. Remove similar security labels.
2352 * Called with the dentry->d_inode->i_mutex held.
2354 * Return: Return 0 on success. If error is returned, then the operation
2355 * causing setuid bit removal is failed.
2357 int security_inode_killpriv(struct mnt_idmap *idmap,
2358 struct dentry *dentry)
2360 return call_int_hook(inode_killpriv, 0, idmap, dentry);
2364 * security_inode_getsecurity() - Get the xattr security label of an inode
2365 * @idmap: idmap of the mount
2368 * @buffer: security label buffer
2369 * @alloc: allocation flag
2371 * Retrieve a copy of the extended attribute representation of the security
2372 * label associated with @name for @inode via @buffer. Note that @name is the
2373 * remainder of the attribute name after the security prefix has been removed.
2374 * @alloc is used to specify if the call should return a value via the buffer
2375 * or just the value length.
2377 * Return: Returns size of buffer on success.
2379 int security_inode_getsecurity(struct mnt_idmap *idmap,
2380 struct inode *inode, const char *name,
2381 void **buffer, bool alloc)
2383 struct security_hook_list *hp;
2386 if (unlikely(IS_PRIVATE(inode)))
2387 return LSM_RET_DEFAULT(inode_getsecurity);
2389 * Only one module will provide an attribute with a given name.
2391 hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
2392 rc = hp->hook.inode_getsecurity(idmap, inode, name, buffer,
2394 if (rc != LSM_RET_DEFAULT(inode_getsecurity))
2397 return LSM_RET_DEFAULT(inode_getsecurity);
2401 * security_inode_setsecurity() - Set the xattr security label of an inode
2404 * @value: security label
2405 * @size: length of security label
2408 * Set the security label associated with @name for @inode from the extended
2409 * attribute value @value. @size indicates the size of the @value in bytes.
2410 * @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
2411 * remainder of the attribute name after the security. prefix has been removed.
2413 * Return: Returns 0 on success.
2415 int security_inode_setsecurity(struct inode *inode, const char *name,
2416 const void *value, size_t size, int flags)
2418 struct security_hook_list *hp;
2421 if (unlikely(IS_PRIVATE(inode)))
2422 return LSM_RET_DEFAULT(inode_setsecurity);
2424 * Only one module will provide an attribute with a given name.
2426 hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
2427 rc = hp->hook.inode_setsecurity(inode, name, value, size,
2429 if (rc != LSM_RET_DEFAULT(inode_setsecurity))
2432 return LSM_RET_DEFAULT(inode_setsecurity);
2436 * security_inode_listsecurity() - List the xattr security label names
2439 * @buffer_size: size of buffer
2441 * Copy the extended attribute names for the security labels associated with
2442 * @inode into @buffer. The maximum size of @buffer is specified by
2443 * @buffer_size. @buffer may be NULL to request the size of the buffer
2446 * Return: Returns number of bytes used/required on success.
2448 int security_inode_listsecurity(struct inode *inode,
2449 char *buffer, size_t buffer_size)
2451 if (unlikely(IS_PRIVATE(inode)))
2453 return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size);
2455 EXPORT_SYMBOL(security_inode_listsecurity);
2458 * security_inode_getsecid() - Get an inode's secid
2460 * @secid: secid to return
2462 * Get the secid associated with the node. In case of failure, @secid will be
2465 void security_inode_getsecid(struct inode *inode, u32 *secid)
2467 call_void_hook(inode_getsecid, inode, secid);
2471 * security_inode_copy_up() - Create new creds for an overlayfs copy-up op
2472 * @src: union dentry of copy-up file
2473 * @new: newly created creds
2475 * A file is about to be copied up from lower layer to upper layer of overlay
2476 * filesystem. Security module can prepare a set of new creds and modify as
2477 * need be and return new creds. Caller will switch to new creds temporarily to
2478 * create new file and release newly allocated creds.
2480 * Return: Returns 0 on success or a negative error code on error.
2482 int security_inode_copy_up(struct dentry *src, struct cred **new)
2484 return call_int_hook(inode_copy_up, 0, src, new);
2486 EXPORT_SYMBOL(security_inode_copy_up);
2489 * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
2492 * Filter the xattrs being copied up when a unioned file is copied up from a
2493 * lower layer to the union/overlay layer. The caller is responsible for
2494 * reading and writing the xattrs, this hook is merely a filter.
2496 * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
2497 * if the security module does not know about attribute, or a negative
2498 * error code to abort the copy up.
2500 int security_inode_copy_up_xattr(const char *name)
2502 struct security_hook_list *hp;
2506 * The implementation can return 0 (accept the xattr), 1 (discard the
2507 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
2508 * any other error code in case of an error.
2510 hlist_for_each_entry(hp,
2511 &security_hook_heads.inode_copy_up_xattr, list) {
2512 rc = hp->hook.inode_copy_up_xattr(name);
2513 if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
2517 return LSM_RET_DEFAULT(inode_copy_up_xattr);
2519 EXPORT_SYMBOL(security_inode_copy_up_xattr);
2522 * security_kernfs_init_security() - Init LSM context for a kernfs node
2523 * @kn_dir: parent kernfs node
2524 * @kn: the kernfs node to initialize
2526 * Initialize the security context of a newly created kernfs node based on its
2527 * own and its parent's attributes.
2529 * Return: Returns 0 if permission is granted.
2531 int security_kernfs_init_security(struct kernfs_node *kn_dir,
2532 struct kernfs_node *kn)
2534 return call_int_hook(kernfs_init_security, 0, kn_dir, kn);
2538 * security_file_permission() - Check file permissions
2540 * @mask: requested permissions
2542 * Check file permissions before accessing an open file. This hook is called
2543 * by various operations that read or write files. A security module can use
2544 * this hook to perform additional checking on these operations, e.g. to
2545 * revalidate permissions on use to support privilege bracketing or policy
2546 * changes. Notice that this hook is used when the actual read/write
2547 * operations are performed, whereas the inode_security_ops hook is called when
2548 * a file is opened (as well as many other operations). Although this hook can
2549 * be used to revalidate permissions for various system call operations that
2550 * read or write files, it does not address the revalidation of permissions for
2551 * memory-mapped files. Security modules must handle this separately if they
2552 * need such revalidation.
2554 * Return: Returns 0 if permission is granted.
2556 int security_file_permission(struct file *file, int mask)
2560 ret = call_int_hook(file_permission, 0, file, mask);
2564 return fsnotify_perm(file, mask);
2568 * security_file_alloc() - Allocate and init a file's LSM blob
2571 * Allocate and attach a security structure to the file->f_security field. The
2572 * security field is initialized to NULL when the structure is first created.
2574 * Return: Return 0 if the hook is successful and permission is granted.
2576 int security_file_alloc(struct file *file)
2578 int rc = lsm_file_alloc(file);
2582 rc = call_int_hook(file_alloc_security, 0, file);
2584 security_file_free(file);
2589 * security_file_free() - Free a file's LSM blob
2592 * Deallocate and free any security structures stored in file->f_security.
2594 void security_file_free(struct file *file)
2598 call_void_hook(file_free_security, file);
2600 blob = file->f_security;
2602 file->f_security = NULL;
2603 kmem_cache_free(lsm_file_cache, blob);
2608 * security_file_ioctl() - Check if an ioctl is allowed
2609 * @file: associated file
2611 * @arg: ioctl arguments
2613 * Check permission for an ioctl operation on @file. Note that @arg sometimes
2614 * represents a user space pointer; in other cases, it may be a simple integer
2615 * value. When @arg represents a user space pointer, it should never be used
2616 * by the security module.
2618 * Return: Returns 0 if permission is granted.
2620 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2622 return call_int_hook(file_ioctl, 0, file, cmd, arg);
2624 EXPORT_SYMBOL_GPL(security_file_ioctl);
2626 static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
2629 * Does we have PROT_READ and does the application expect
2630 * it to imply PROT_EXEC? If not, nothing to talk about...
2632 if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
2634 if (!(current->personality & READ_IMPLIES_EXEC))
2637 * if that's an anonymous mapping, let it.
2640 return prot | PROT_EXEC;
2642 * ditto if it's not on noexec mount, except that on !MMU we need
2643 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
2645 if (!path_noexec(&file->f_path)) {
2647 if (file->f_op->mmap_capabilities) {
2648 unsigned caps = file->f_op->mmap_capabilities(file);
2649 if (!(caps & NOMMU_MAP_EXEC))
2653 return prot | PROT_EXEC;
2655 /* anything on noexec mount won't get PROT_EXEC */
2660 * security_mmap_file() - Check if mmap'ing a file is allowed
2662 * @prot: protection applied by the kernel
2665 * Check permissions for a mmap operation. The @file may be NULL, e.g. if
2666 * mapping anonymous memory.
2668 * Return: Returns 0 if permission is granted.
2670 int security_mmap_file(struct file *file, unsigned long prot,
2671 unsigned long flags)
2673 unsigned long prot_adj = mmap_prot(file, prot);
2676 ret = call_int_hook(mmap_file, 0, file, prot, prot_adj, flags);
2679 return ima_file_mmap(file, prot, prot_adj, flags);
2683 * security_mmap_addr() - Check if mmap'ing an address is allowed
2686 * Check permissions for a mmap operation at @addr.
2688 * Return: Returns 0 if permission is granted.
2690 int security_mmap_addr(unsigned long addr)
2692 return call_int_hook(mmap_addr, 0, addr);
2696 * security_file_mprotect() - Check if changing memory protections is allowed
2697 * @vma: memory region
2698 * @reqprot: application requested protection
2699 * @prot: protection applied by the kernel
2701 * Check permissions before changing memory access permissions.
2703 * Return: Returns 0 if permission is granted.
2705 int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
2710 ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot);
2713 return ima_file_mprotect(vma, prot);
2717 * security_file_lock() - Check if a file lock is allowed
2719 * @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
2721 * Check permission before performing file locking operations. Note the hook
2722 * mediates both flock and fcntl style locks.
2724 * Return: Returns 0 if permission is granted.
2726 int security_file_lock(struct file *file, unsigned int cmd)
2728 return call_int_hook(file_lock, 0, file, cmd);
2732 * security_file_fcntl() - Check if fcntl() op is allowed
2734 * @cmd: fnctl command
2735 * @arg: command argument
2737 * Check permission before allowing the file operation specified by @cmd from
2738 * being performed on the file @file. Note that @arg sometimes represents a
2739 * user space pointer; in other cases, it may be a simple integer value. When
2740 * @arg represents a user space pointer, it should never be used by the
2743 * Return: Returns 0 if permission is granted.
2745 int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
2747 return call_int_hook(file_fcntl, 0, file, cmd, arg);
2751 * security_file_set_fowner() - Set the file owner info in the LSM blob
2754 * Save owner security information (typically from current->security) in
2755 * file->f_security for later use by the send_sigiotask hook.
2757 * Return: Returns 0 on success.
2759 void security_file_set_fowner(struct file *file)
2761 call_void_hook(file_set_fowner, file);
2765 * security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
2767 * @fown: signal sender
2768 * @sig: signal to be sent, SIGIO is sent if 0
2770 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
2771 * process @tsk. Note that this hook is sometimes called from interrupt. Note
2772 * that the fown_struct, @fown, is never outside the context of a struct file,
2773 * so the file structure (and associated security information) can always be
2774 * obtained: container_of(fown, struct file, f_owner).
2776 * Return: Returns 0 if permission is granted.
2778 int security_file_send_sigiotask(struct task_struct *tsk,
2779 struct fown_struct *fown, int sig)
2781 return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig);
2785 * security_file_receive() - Check is receiving a file via IPC is allowed
2786 * @file: file being received
2788 * This hook allows security modules to control the ability of a process to
2789 * receive an open file descriptor via socket IPC.
2791 * Return: Returns 0 if permission is granted.
2793 int security_file_receive(struct file *file)
2795 return call_int_hook(file_receive, 0, file);
2799 * security_file_open() - Save open() time state for late use by the LSM
2802 * Save open-time permission checking state for later use upon file_permission,
2803 * and recheck access if anything has changed since inode_permission.
2805 * Return: Returns 0 if permission is granted.
2807 int security_file_open(struct file *file)
2811 ret = call_int_hook(file_open, 0, file);
2815 return fsnotify_perm(file, MAY_OPEN);
2819 * security_file_truncate() - Check if truncating a file is allowed
2822 * Check permission before truncating a file, i.e. using ftruncate. Note that
2823 * truncation permission may also be checked based on the path, using the
2824 * @path_truncate hook.
2826 * Return: Returns 0 if permission is granted.
2828 int security_file_truncate(struct file *file)
2830 return call_int_hook(file_truncate, 0, file);
2834 * security_task_alloc() - Allocate a task's LSM blob
2836 * @clone_flags: flags indicating what is being shared
2838 * Handle allocation of task-related resources.
2840 * Return: Returns a zero on success, negative values on failure.
2842 int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
2844 int rc = lsm_task_alloc(task);
2848 rc = call_int_hook(task_alloc, 0, task, clone_flags);
2850 security_task_free(task);
2855 * security_task_free() - Free a task's LSM blob and related resources
2858 * Handle release of task-related resources. Note that this can be called from
2859 * interrupt context.
2861 void security_task_free(struct task_struct *task)
2863 call_void_hook(task_free, task);
2865 kfree(task->security);
2866 task->security = NULL;
2870 * security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
2871 * @cred: credentials
2874 * Only allocate sufficient memory and attach to @cred such that
2875 * cred_transfer() will not get ENOMEM.
2877 * Return: Returns 0 on success, negative values on failure.
2879 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
2881 int rc = lsm_cred_alloc(cred, gfp);
2886 rc = call_int_hook(cred_alloc_blank, 0, cred, gfp);
2888 security_cred_free(cred);
2893 * security_cred_free() - Free the cred's LSM blob and associated resources
2894 * @cred: credentials
2896 * Deallocate and clear the cred->security field in a set of credentials.
2898 void security_cred_free(struct cred *cred)
2901 * There is a failure case in prepare_creds() that
2902 * may result in a call here with ->security being NULL.
2904 if (unlikely(cred->security == NULL))
2907 call_void_hook(cred_free, cred);
2909 kfree(cred->security);
2910 cred->security = NULL;
2914 * security_prepare_creds() - Prepare a new set of credentials
2915 * @new: new credentials
2916 * @old: original credentials
2919 * Prepare a new set of credentials by copying the data from the old set.
2921 * Return: Returns 0 on success, negative values on failure.
2923 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
2925 int rc = lsm_cred_alloc(new, gfp);
2930 rc = call_int_hook(cred_prepare, 0, new, old, gfp);
2932 security_cred_free(new);
2937 * security_transfer_creds() - Transfer creds
2938 * @new: target credentials
2939 * @old: original credentials
2941 * Transfer data from original creds to new creds.
2943 void security_transfer_creds(struct cred *new, const struct cred *old)
2945 call_void_hook(cred_transfer, new, old);
2949 * security_cred_getsecid() - Get the secid from a set of credentials
2951 * @secid: secid value
2953 * Retrieve the security identifier of the cred structure @c. In case of
2954 * failure, @secid will be set to zero.
2956 void security_cred_getsecid(const struct cred *c, u32 *secid)
2959 call_void_hook(cred_getsecid, c, secid);
2961 EXPORT_SYMBOL(security_cred_getsecid);
2964 * security_kernel_act_as() - Set the kernel credentials to act as secid
2968 * Set the credentials for a kernel service to act as (subjective context).
2969 * The current task must be the one that nominated @secid.
2971 * Return: Returns 0 if successful.
2973 int security_kernel_act_as(struct cred *new, u32 secid)
2975 return call_int_hook(kernel_act_as, 0, new, secid);
2979 * security_kernel_create_files_as() - Set file creation context using an inode
2980 * @new: target credentials
2981 * @inode: reference inode
2983 * Set the file creation context in a set of credentials to be the same as the
2984 * objective context of the specified inode. The current task must be the one
2985 * that nominated @inode.
2987 * Return: Returns 0 if successful.
2989 int security_kernel_create_files_as(struct cred *new, struct inode *inode)
2991 return call_int_hook(kernel_create_files_as, 0, new, inode);
2995 * security_kernel_module_request() - Check is loading a module is allowed
2996 * @kmod_name: module name
2998 * Ability to trigger the kernel to automatically upcall to userspace for
2999 * userspace to load a kernel module with the given name.
3001 * Return: Returns 0 if successful.
3003 int security_kernel_module_request(char *kmod_name)
3007 ret = call_int_hook(kernel_module_request, 0, kmod_name);
3010 return integrity_kernel_module_request(kmod_name);
3014 * security_kernel_read_file() - Read a file specified by userspace
3016 * @id: file identifier
3017 * @contents: trust if security_kernel_post_read_file() will be called
3019 * Read a file specified by userspace.
3021 * Return: Returns 0 if permission is granted.
3023 int security_kernel_read_file(struct file *file, enum kernel_read_file_id id,
3028 ret = call_int_hook(kernel_read_file, 0, file, id, contents);
3031 return ima_read_file(file, id, contents);
3033 EXPORT_SYMBOL_GPL(security_kernel_read_file);
3036 * security_kernel_post_read_file() - Read a file specified by userspace
3038 * @buf: file contents
3039 * @size: size of file contents
3040 * @id: file identifier
3042 * Read a file specified by userspace. This must be paired with a prior call
3043 * to security_kernel_read_file() call that indicated this hook would also be
3044 * called, see security_kernel_read_file() for more information.
3046 * Return: Returns 0 if permission is granted.
3048 int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
3049 enum kernel_read_file_id id)
3053 ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id);
3056 return ima_post_read_file(file, buf, size, id);
3058 EXPORT_SYMBOL_GPL(security_kernel_post_read_file);
3061 * security_kernel_load_data() - Load data provided by userspace
3062 * @id: data identifier
3063 * @contents: true if security_kernel_post_load_data() will be called
3065 * Load data provided by userspace.
3067 * Return: Returns 0 if permission is granted.
3069 int security_kernel_load_data(enum kernel_load_data_id id, bool contents)
3073 ret = call_int_hook(kernel_load_data, 0, id, contents);
3076 return ima_load_data(id, contents);
3078 EXPORT_SYMBOL_GPL(security_kernel_load_data);
3081 * security_kernel_post_load_data() - Load userspace data from a non-file source
3083 * @size: size of data
3084 * @id: data identifier
3085 * @description: text description of data, specific to the id value
3087 * Load data provided by a non-file source (usually userspace buffer). This
3088 * must be paired with a prior security_kernel_load_data() call that indicated
3089 * this hook would also be called, see security_kernel_load_data() for more
3092 * Return: Returns 0 if permission is granted.
3094 int security_kernel_post_load_data(char *buf, loff_t size,
3095 enum kernel_load_data_id id,
3100 ret = call_int_hook(kernel_post_load_data, 0, buf, size, id,
3104 return ima_post_load_data(buf, size, id, description);
3106 EXPORT_SYMBOL_GPL(security_kernel_post_load_data);
3109 * security_task_fix_setuid() - Update LSM with new user id attributes
3110 * @new: updated credentials
3111 * @old: credentials being replaced
3112 * @flags: LSM_SETID_* flag values
3114 * Update the module's state after setting one or more of the user identity
3115 * attributes of the current process. The @flags parameter indicates which of
3116 * the set*uid system calls invoked this hook. If @new is the set of
3117 * credentials that will be installed. Modifications should be made to this
3118 * rather than to @current->cred.
3120 * Return: Returns 0 on success.
3122 int security_task_fix_setuid(struct cred *new, const struct cred *old,
3125 return call_int_hook(task_fix_setuid, 0, new, old, flags);
3129 * security_task_fix_setgid() - Update LSM with new group id attributes
3130 * @new: updated credentials
3131 * @old: credentials being replaced
3132 * @flags: LSM_SETID_* flag value
3134 * Update the module's state after setting one or more of the group identity
3135 * attributes of the current process. The @flags parameter indicates which of
3136 * the set*gid system calls invoked this hook. @new is the set of credentials
3137 * that will be installed. Modifications should be made to this rather than to
3140 * Return: Returns 0 on success.
3142 int security_task_fix_setgid(struct cred *new, const struct cred *old,
3145 return call_int_hook(task_fix_setgid, 0, new, old, flags);
3149 * security_task_fix_setgroups() - Update LSM with new supplementary groups
3150 * @new: updated credentials
3151 * @old: credentials being replaced
3153 * Update the module's state after setting the supplementary group identity
3154 * attributes of the current process. @new is the set of credentials that will
3155 * be installed. Modifications should be made to this rather than to
3158 * Return: Returns 0 on success.
3160 int security_task_fix_setgroups(struct cred *new, const struct cred *old)
3162 return call_int_hook(task_fix_setgroups, 0, new, old);
3166 * security_task_setpgid() - Check if setting the pgid is allowed
3167 * @p: task being modified
3170 * Check permission before setting the process group identifier of the process
3173 * Return: Returns 0 if permission is granted.
3175 int security_task_setpgid(struct task_struct *p, pid_t pgid)
3177 return call_int_hook(task_setpgid, 0, p, pgid);
3181 * security_task_getpgid() - Check if getting the pgid is allowed
3184 * Check permission before getting the process group identifier of the process
3187 * Return: Returns 0 if permission is granted.
3189 int security_task_getpgid(struct task_struct *p)
3191 return call_int_hook(task_getpgid, 0, p);
3195 * security_task_getsid() - Check if getting the session id is allowed
3198 * Check permission before getting the session identifier of the process @p.
3200 * Return: Returns 0 if permission is granted.
3202 int security_task_getsid(struct task_struct *p)
3204 return call_int_hook(task_getsid, 0, p);
3208 * security_current_getsecid_subj() - Get the current task's subjective secid
3209 * @secid: secid value
3211 * Retrieve the subjective security identifier of the current task and return
3212 * it in @secid. In case of failure, @secid will be set to zero.
3214 void security_current_getsecid_subj(u32 *secid)
3217 call_void_hook(current_getsecid_subj, secid);
3219 EXPORT_SYMBOL(security_current_getsecid_subj);
3222 * security_task_getsecid_obj() - Get a task's objective secid
3224 * @secid: secid value
3226 * Retrieve the objective security identifier of the task_struct in @p and
3227 * return it in @secid. In case of failure, @secid will be set to zero.
3229 void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
3232 call_void_hook(task_getsecid_obj, p, secid);
3234 EXPORT_SYMBOL(security_task_getsecid_obj);
3237 * security_task_setnice() - Check if setting a task's nice value is allowed
3241 * Check permission before setting the nice value of @p to @nice.
3243 * Return: Returns 0 if permission is granted.
3245 int security_task_setnice(struct task_struct *p, int nice)
3247 return call_int_hook(task_setnice, 0, p, nice);
3251 * security_task_setioprio() - Check if setting a task's ioprio is allowed
3253 * @ioprio: ioprio value
3255 * Check permission before setting the ioprio value of @p to @ioprio.
3257 * Return: Returns 0 if permission is granted.
3259 int security_task_setioprio(struct task_struct *p, int ioprio)
3261 return call_int_hook(task_setioprio, 0, p, ioprio);
3265 * security_task_getioprio() - Check if getting a task's ioprio is allowed
3268 * Check permission before getting the ioprio value of @p.
3270 * Return: Returns 0 if permission is granted.
3272 int security_task_getioprio(struct task_struct *p)
3274 return call_int_hook(task_getioprio, 0, p);
3278 * security_task_prlimit() - Check if get/setting resources limits is allowed
3279 * @cred: current task credentials
3280 * @tcred: target task credentials
3281 * @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
3283 * Check permission before getting and/or setting the resource limits of
3286 * Return: Returns 0 if permission is granted.
3288 int security_task_prlimit(const struct cred *cred, const struct cred *tcred,
3291 return call_int_hook(task_prlimit, 0, cred, tcred, flags);
3295 * security_task_setrlimit() - Check if setting a new rlimit value is allowed
3296 * @p: target task's group leader
3297 * @resource: resource whose limit is being set
3298 * @new_rlim: new resource limit
3300 * Check permission before setting the resource limits of process @p for
3301 * @resource to @new_rlim. The old resource limit values can be examined by
3302 * dereferencing (p->signal->rlim + resource).
3304 * Return: Returns 0 if permission is granted.
3306 int security_task_setrlimit(struct task_struct *p, unsigned int resource,
3307 struct rlimit *new_rlim)
3309 return call_int_hook(task_setrlimit, 0, p, resource, new_rlim);
3313 * security_task_setscheduler() - Check if setting sched policy/param is allowed
3316 * Check permission before setting scheduling policy and/or parameters of
3319 * Return: Returns 0 if permission is granted.
3321 int security_task_setscheduler(struct task_struct *p)
3323 return call_int_hook(task_setscheduler, 0, p);
3327 * security_task_getscheduler() - Check if getting scheduling info is allowed
3330 * Check permission before obtaining scheduling information for process @p.
3332 * Return: Returns 0 if permission is granted.
3334 int security_task_getscheduler(struct task_struct *p)
3336 return call_int_hook(task_getscheduler, 0, p);
3340 * security_task_movememory() - Check if moving memory is allowed
3343 * Check permission before moving memory owned by process @p.
3345 * Return: Returns 0 if permission is granted.
3347 int security_task_movememory(struct task_struct *p)
3349 return call_int_hook(task_movememory, 0, p);
3353 * security_task_kill() - Check if sending a signal is allowed
3354 * @p: target process
3355 * @info: signal information
3356 * @sig: signal value
3357 * @cred: credentials of the signal sender, NULL if @current
3359 * Check permission before sending signal @sig to @p. @info can be NULL, the
3360 * constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
3361 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
3362 * the kernel and should typically be permitted. SIGIO signals are handled
3363 * separately by the send_sigiotask hook in file_security_ops.
3365 * Return: Returns 0 if permission is granted.
3367 int security_task_kill(struct task_struct *p, struct kernel_siginfo *info,
3368 int sig, const struct cred *cred)
3370 return call_int_hook(task_kill, 0, p, info, sig, cred);
3374 * security_task_prctl() - Check if a prctl op is allowed
3375 * @option: operation
3381 * Check permission before performing a process control operation on the
3384 * Return: Return -ENOSYS if no-one wanted to handle this op, any other value
3385 * to cause prctl() to return immediately with that value.
3387 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
3388 unsigned long arg4, unsigned long arg5)
3391 int rc = LSM_RET_DEFAULT(task_prctl);
3392 struct security_hook_list *hp;
3394 hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
3395 thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
3396 if (thisrc != LSM_RET_DEFAULT(task_prctl)) {
3406 * security_task_to_inode() - Set the security attributes of a task's inode
3410 * Set the security attributes for an inode based on an associated task's
3411 * security attributes, e.g. for /proc/pid inodes.
3413 void security_task_to_inode(struct task_struct *p, struct inode *inode)
3415 call_void_hook(task_to_inode, p, inode);
3419 * security_create_user_ns() - Check if creating a new userns is allowed
3420 * @cred: prepared creds
3422 * Check permission prior to creating a new user namespace.
3424 * Return: Returns 0 if successful, otherwise < 0 error code.
3426 int security_create_user_ns(const struct cred *cred)
3428 return call_int_hook(userns_create, 0, cred);
3432 * security_ipc_permission() - Check if sysv ipc access is allowed
3433 * @ipcp: ipc permission structure
3434 * @flag: requested permissions
3436 * Check permissions for access to IPC.
3438 * Return: Returns 0 if permission is granted.
3440 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
3442 return call_int_hook(ipc_permission, 0, ipcp, flag);
3446 * security_ipc_getsecid() - Get the sysv ipc object's secid
3447 * @ipcp: ipc permission structure
3448 * @secid: secid pointer
3450 * Get the secid associated with the ipc object. In case of failure, @secid
3451 * will be set to zero.
3453 void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
3456 call_void_hook(ipc_getsecid, ipcp, secid);
3460 * security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
3461 * @msg: message structure
3463 * Allocate and attach a security structure to the msg->security field. The
3464 * security field is initialized to NULL when the structure is first created.
3466 * Return: Return 0 if operation was successful and permission is granted.
3468 int security_msg_msg_alloc(struct msg_msg *msg)
3470 int rc = lsm_msg_msg_alloc(msg);
3474 rc = call_int_hook(msg_msg_alloc_security, 0, msg);
3476 security_msg_msg_free(msg);
3481 * security_msg_msg_free() - Free a sysv ipc message LSM blob
3482 * @msg: message structure
3484 * Deallocate the security structure for this message.
3486 void security_msg_msg_free(struct msg_msg *msg)
3488 call_void_hook(msg_msg_free_security, msg);
3489 kfree(msg->security);
3490 msg->security = NULL;
3494 * security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
3495 * @msq: sysv ipc permission structure
3497 * Allocate and attach a security structure to @msg. The security field is
3498 * initialized to NULL when the structure is first created.
3500 * Return: Returns 0 if operation was successful and permission is granted.
3502 int security_msg_queue_alloc(struct kern_ipc_perm *msq)
3504 int rc = lsm_ipc_alloc(msq);
3508 rc = call_int_hook(msg_queue_alloc_security, 0, msq);
3510 security_msg_queue_free(msq);
3515 * security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
3516 * @msq: sysv ipc permission structure
3518 * Deallocate security field @perm->security for the message queue.
3520 void security_msg_queue_free(struct kern_ipc_perm *msq)
3522 call_void_hook(msg_queue_free_security, msq);
3523 kfree(msq->security);
3524 msq->security = NULL;
3528 * security_msg_queue_associate() - Check if a msg queue operation is allowed
3529 * @msq: sysv ipc permission structure
3530 * @msqflg: operation flags
3532 * Check permission when a message queue is requested through the msgget system
3533 * call. This hook is only called when returning the message queue identifier
3534 * for an existing message queue, not when a new message queue is created.
3536 * Return: Return 0 if permission is granted.
3538 int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
3540 return call_int_hook(msg_queue_associate, 0, msq, msqflg);
3544 * security_msg_queue_msgctl() - Check if a msg queue operation is allowed
3545 * @msq: sysv ipc permission structure
3548 * Check permission when a message control operation specified by @cmd is to be
3549 * performed on the message queue with permissions.
3551 * Return: Returns 0 if permission is granted.
3553 int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
3555 return call_int_hook(msg_queue_msgctl, 0, msq, cmd);
3559 * security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
3560 * @msq: sysv ipc permission structure
3562 * @msqflg: operation flags
3564 * Check permission before a message, @msg, is enqueued on the message queue
3565 * with permissions specified in @msq.
3567 * Return: Returns 0 if permission is granted.
3569 int security_msg_queue_msgsnd(struct kern_ipc_perm *msq,
3570 struct msg_msg *msg, int msqflg)
3572 return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg);
3576 * security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
3577 * @msq: sysv ipc permission structure
3579 * @target: target task
3580 * @type: type of message requested
3581 * @mode: operation flags
3583 * Check permission before a message, @msg, is removed from the message queue.
3584 * The @target task structure contains a pointer to the process that will be
3585 * receiving the message (not equal to the current process when inline receives
3586 * are being performed).
3588 * Return: Returns 0 if permission is granted.
3590 int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
3591 struct task_struct *target, long type, int mode)
3593 return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode);
3597 * security_shm_alloc() - Allocate a sysv shm LSM blob
3598 * @shp: sysv ipc permission structure
3600 * Allocate and attach a security structure to the @shp security field. The
3601 * security field is initialized to NULL when the structure is first created.
3603 * Return: Returns 0 if operation was successful and permission is granted.
3605 int security_shm_alloc(struct kern_ipc_perm *shp)
3607 int rc = lsm_ipc_alloc(shp);
3611 rc = call_int_hook(shm_alloc_security, 0, shp);
3613 security_shm_free(shp);
3618 * security_shm_free() - Free a sysv shm LSM blob
3619 * @shp: sysv ipc permission structure
3621 * Deallocate the security structure @perm->security for the memory segment.
3623 void security_shm_free(struct kern_ipc_perm *shp)
3625 call_void_hook(shm_free_security, shp);
3626 kfree(shp->security);
3627 shp->security = NULL;
3631 * security_shm_associate() - Check if a sysv shm operation is allowed
3632 * @shp: sysv ipc permission structure
3633 * @shmflg: operation flags
3635 * Check permission when a shared memory region is requested through the shmget
3636 * system call. This hook is only called when returning the shared memory
3637 * region identifier for an existing region, not when a new shared memory
3638 * region is created.
3640 * Return: Returns 0 if permission is granted.
3642 int security_shm_associate(struct kern_ipc_perm *shp, int shmflg)
3644 return call_int_hook(shm_associate, 0, shp, shmflg);
3648 * security_shm_shmctl() - Check if a sysv shm operation is allowed
3649 * @shp: sysv ipc permission structure
3652 * Check permission when a shared memory control operation specified by @cmd is
3653 * to be performed on the shared memory region with permissions in @shp.
3655 * Return: Return 0 if permission is granted.
3657 int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
3659 return call_int_hook(shm_shmctl, 0, shp, cmd);
3663 * security_shm_shmat() - Check if a sysv shm attach operation is allowed
3664 * @shp: sysv ipc permission structure
3665 * @shmaddr: address of memory region to attach
3666 * @shmflg: operation flags
3668 * Check permissions prior to allowing the shmat system call to attach the
3669 * shared memory segment with permissions @shp to the data segment of the
3670 * calling process. The attaching address is specified by @shmaddr.
3672 * Return: Returns 0 if permission is granted.
3674 int security_shm_shmat(struct kern_ipc_perm *shp,
3675 char __user *shmaddr, int shmflg)
3677 return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg);
3681 * security_sem_alloc() - Allocate a sysv semaphore LSM blob
3682 * @sma: sysv ipc permission structure
3684 * Allocate and attach a security structure to the @sma security field. The
3685 * security field is initialized to NULL when the structure is first created.
3687 * Return: Returns 0 if operation was successful and permission is granted.
3689 int security_sem_alloc(struct kern_ipc_perm *sma)
3691 int rc = lsm_ipc_alloc(sma);
3695 rc = call_int_hook(sem_alloc_security, 0, sma);
3697 security_sem_free(sma);
3702 * security_sem_free() - Free a sysv semaphore LSM blob
3703 * @sma: sysv ipc permission structure
3705 * Deallocate security structure @sma->security for the semaphore.
3707 void security_sem_free(struct kern_ipc_perm *sma)
3709 call_void_hook(sem_free_security, sma);
3710 kfree(sma->security);
3711 sma->security = NULL;
3715 * security_sem_associate() - Check if a sysv semaphore operation is allowed
3716 * @sma: sysv ipc permission structure
3717 * @semflg: operation flags
3719 * Check permission when a semaphore is requested through the semget system
3720 * call. This hook is only called when returning the semaphore identifier for
3721 * an existing semaphore, not when a new one must be created.
3723 * Return: Returns 0 if permission is granted.
3725 int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
3727 return call_int_hook(sem_associate, 0, sma, semflg);
3731 * security_sem_semctl() - Check if a sysv semaphore operation is allowed
3732 * @sma: sysv ipc permission structure
3735 * Check permission when a semaphore operation specified by @cmd is to be
3736 * performed on the semaphore.
3738 * Return: Returns 0 if permission is granted.
3740 int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
3742 return call_int_hook(sem_semctl, 0, sma, cmd);
3746 * security_sem_semop() - Check if a sysv semaphore operation is allowed
3747 * @sma: sysv ipc permission structure
3748 * @sops: operations to perform
3749 * @nsops: number of operations
3750 * @alter: flag indicating changes will be made
3752 * Check permissions before performing operations on members of the semaphore
3753 * set. If the @alter flag is nonzero, the semaphore set may be modified.
3755 * Return: Returns 0 if permission is granted.
3757 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
3758 unsigned nsops, int alter)
3760 return call_int_hook(sem_semop, 0, sma, sops, nsops, alter);
3764 * security_d_instantiate() - Populate an inode's LSM state based on a dentry
3768 * Fill in @inode security information for a @dentry if allowed.
3770 void security_d_instantiate(struct dentry *dentry, struct inode *inode)
3772 if (unlikely(inode && IS_PRIVATE(inode)))
3774 call_void_hook(d_instantiate, dentry, inode);
3776 EXPORT_SYMBOL(security_d_instantiate);
3779 * security_getprocattr() - Read an attribute for a task
3782 * @name: attribute name
3783 * @value: attribute value
3785 * Read attribute @name for task @p and store it into @value if allowed.
3787 * Return: Returns the length of @value on success, a negative value otherwise.
3789 int security_getprocattr(struct task_struct *p, const char *lsm,
3790 const char *name, char **value)
3792 struct security_hook_list *hp;
3794 hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
3795 if (lsm != NULL && strcmp(lsm, hp->lsm))
3797 return hp->hook.getprocattr(p, name, value);
3799 return LSM_RET_DEFAULT(getprocattr);
3803 * security_setprocattr() - Set an attribute for a task
3805 * @name: attribute name
3806 * @value: attribute value
3807 * @size: attribute value size
3809 * Write (set) the current task's attribute @name to @value, size @size if
3812 * Return: Returns bytes written on success, a negative value otherwise.
3814 int security_setprocattr(const char *lsm, const char *name, void *value,
3817 struct security_hook_list *hp;
3819 hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
3820 if (lsm != NULL && strcmp(lsm, hp->lsm))
3822 return hp->hook.setprocattr(name, value, size);
3824 return LSM_RET_DEFAULT(setprocattr);
3828 * security_netlink_send() - Save info and check if netlink sending is allowed
3829 * @sk: sending socket
3830 * @skb: netlink message
3832 * Save security information for a netlink message so that permission checking
3833 * can be performed when the message is processed. The security information
3834 * can be saved using the eff_cap field of the netlink_skb_parms structure.
3835 * Also may be used to provide fine grained control over message transmission.
3837 * Return: Returns 0 if the information was successfully saved and message is
3838 * allowed to be transmitted.
3840 int security_netlink_send(struct sock *sk, struct sk_buff *skb)
3842 return call_int_hook(netlink_send, 0, sk, skb);
3846 * security_ismaclabel() - Check is the named attribute is a MAC label
3847 * @name: full extended attribute name
3849 * Check if the extended attribute specified by @name represents a MAC label.
3851 * Return: Returns 1 if name is a MAC attribute otherwise returns 0.
3853 int security_ismaclabel(const char *name)
3855 return call_int_hook(ismaclabel, 0, name);
3857 EXPORT_SYMBOL(security_ismaclabel);
3860 * security_secid_to_secctx() - Convert a secid to a secctx
3863 * @seclen: secctx length
3865 * Convert secid to security context. If @secdata is NULL the length of the
3866 * result will be returned in @seclen, but no @secdata will be returned. This
3867 * does mean that the length could change between calls to check the length and
3868 * the next call which actually allocates and returns the @secdata.
3870 * Return: Return 0 on success, error on failure.
3872 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3874 struct security_hook_list *hp;
3878 * Currently, only one LSM can implement secid_to_secctx (i.e this
3879 * LSM hook is not "stackable").
3881 hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
3882 rc = hp->hook.secid_to_secctx(secid, secdata, seclen);
3883 if (rc != LSM_RET_DEFAULT(secid_to_secctx))
3887 return LSM_RET_DEFAULT(secid_to_secctx);
3889 EXPORT_SYMBOL(security_secid_to_secctx);
3892 * security_secctx_to_secid() - Convert a secctx to a secid
3894 * @seclen: length of secctx
3897 * Convert security context to secid.
3899 * Return: Returns 0 on success, error on failure.
3901 int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3904 return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid);
3906 EXPORT_SYMBOL(security_secctx_to_secid);
3909 * security_release_secctx() - Free a secctx buffer
3911 * @seclen: length of secctx
3913 * Release the security context.
3915 void security_release_secctx(char *secdata, u32 seclen)
3917 call_void_hook(release_secctx, secdata, seclen);
3919 EXPORT_SYMBOL(security_release_secctx);
3922 * security_inode_invalidate_secctx() - Invalidate an inode's security label
3925 * Notify the security module that it must revalidate the security context of
3928 void security_inode_invalidate_secctx(struct inode *inode)
3930 call_void_hook(inode_invalidate_secctx, inode);
3932 EXPORT_SYMBOL(security_inode_invalidate_secctx);
3935 * security_inode_notifysecctx() - Nofify the LSM of an inode's security label
3938 * @ctxlen: length of secctx
3940 * Notify the security module of what the security context of an inode should
3941 * be. Initializes the incore security context managed by the security module
3942 * for this inode. Example usage: NFS client invokes this hook to initialize
3943 * the security context in its incore inode to the value provided by the server
3944 * for the file when the server returned the file's attributes to the client.
3945 * Must be called with inode->i_mutex locked.
3947 * Return: Returns 0 on success, error on failure.
3949 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3951 return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen);
3953 EXPORT_SYMBOL(security_inode_notifysecctx);
3956 * security_inode_setsecctx() - Change the security label of an inode
3959 * @ctxlen: length of secctx
3961 * Change the security context of an inode. Updates the incore security
3962 * context managed by the security module and invokes the fs code as needed
3963 * (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
3964 * context. Example usage: NFS server invokes this hook to change the security
3965 * context in its incore inode and on the backing filesystem to a value
3966 * provided by the client on a SETATTR operation. Must be called with
3967 * inode->i_mutex locked.
3969 * Return: Returns 0 on success, error on failure.
3971 int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3973 return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen);
3975 EXPORT_SYMBOL(security_inode_setsecctx);
3978 * security_inode_getsecctx() - Get the security label of an inode
3981 * @ctxlen: length of secctx
3983 * On success, returns 0 and fills out @ctx and @ctxlen with the security
3984 * context for the given @inode.
3986 * Return: Returns 0 on success, error on failure.
3988 int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3990 return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen);
3992 EXPORT_SYMBOL(security_inode_getsecctx);
3994 #ifdef CONFIG_WATCH_QUEUE
3996 * security_post_notification() - Check if a watch notification can be posted
3997 * @w_cred: credentials of the task that set the watch
3998 * @cred: credentials of the task which triggered the watch
3999 * @n: the notification
4001 * Check to see if a watch notification can be posted to a particular queue.
4003 * Return: Returns 0 if permission is granted.
4005 int security_post_notification(const struct cred *w_cred,
4006 const struct cred *cred,
4007 struct watch_notification *n)
4009 return call_int_hook(post_notification, 0, w_cred, cred, n);
4011 #endif /* CONFIG_WATCH_QUEUE */
4013 #ifdef CONFIG_KEY_NOTIFICATIONS
4015 * security_watch_key() - Check if a task is allowed to watch for key events
4016 * @key: the key to watch
4018 * Check to see if a process is allowed to watch for event notifications from
4021 * Return: Returns 0 if permission is granted.
4023 int security_watch_key(struct key *key)
4025 return call_int_hook(watch_key, 0, key);
4027 #endif /* CONFIG_KEY_NOTIFICATIONS */
4029 #ifdef CONFIG_SECURITY_NETWORK
4031 * security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
4032 * @sock: originating sock
4036 * Check permissions before establishing a Unix domain stream connection
4037 * between @sock and @other.
4039 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4040 * Linux provides an alternative to the conventional file name space for Unix
4041 * domain sockets. Whereas binding and connecting to sockets in the file name
4042 * space is mediated by the typical file permissions (and caught by the mknod
4043 * and permission hooks in inode_security_ops), binding and connecting to
4044 * sockets in the abstract name space is completely unmediated. Sufficient
4045 * control of Unix domain sockets in the abstract name space isn't possible
4046 * using only the socket layer hooks, since we need to know the actual target
4047 * socket, which is not looked up until we are inside the af_unix code.
4049 * Return: Returns 0 if permission is granted.
4051 int security_unix_stream_connect(struct sock *sock, struct sock *other,
4054 return call_int_hook(unix_stream_connect, 0, sock, other, newsk);
4056 EXPORT_SYMBOL(security_unix_stream_connect);
4059 * security_unix_may_send() - Check if AF_UNIX socket can send datagrams
4060 * @sock: originating sock
4063 * Check permissions before connecting or sending datagrams from @sock to
4066 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4067 * Linux provides an alternative to the conventional file name space for Unix
4068 * domain sockets. Whereas binding and connecting to sockets in the file name
4069 * space is mediated by the typical file permissions (and caught by the mknod
4070 * and permission hooks in inode_security_ops), binding and connecting to
4071 * sockets in the abstract name space is completely unmediated. Sufficient
4072 * control of Unix domain sockets in the abstract name space isn't possible
4073 * using only the socket layer hooks, since we need to know the actual target
4074 * socket, which is not looked up until we are inside the af_unix code.
4076 * Return: Returns 0 if permission is granted.
4078 int security_unix_may_send(struct socket *sock, struct socket *other)
4080 return call_int_hook(unix_may_send, 0, sock, other);
4082 EXPORT_SYMBOL(security_unix_may_send);
4085 * security_socket_create() - Check if creating a new socket is allowed
4086 * @family: protocol family
4087 * @type: communications type
4088 * @protocol: requested protocol
4089 * @kern: set to 1 if a kernel socket is requested
4091 * Check permissions prior to creating a new socket.
4093 * Return: Returns 0 if permission is granted.
4095 int security_socket_create(int family, int type, int protocol, int kern)
4097 return call_int_hook(socket_create, 0, family, type, protocol, kern);
4101 * security_socket_post_create() - Initialize a newly created socket
4103 * @family: protocol family
4104 * @type: communications type
4105 * @protocol: requested protocol
4106 * @kern: set to 1 if a kernel socket is requested
4108 * This hook allows a module to update or allocate a per-socket security
4109 * structure. Note that the security field was not added directly to the socket
4110 * structure, but rather, the socket security information is stored in the
4111 * associated inode. Typically, the inode alloc_security hook will allocate
4112 * and attach security information to SOCK_INODE(sock)->i_security. This hook
4113 * may be used to update the SOCK_INODE(sock)->i_security field with additional
4114 * information that wasn't available when the inode was allocated.
4116 * Return: Returns 0 if permission is granted.
4118 int security_socket_post_create(struct socket *sock, int family,
4119 int type, int protocol, int kern)
4121 return call_int_hook(socket_post_create, 0, sock, family, type,
4126 * security_socket_socketpair() - Check if creating a socketpair is allowed
4127 * @socka: first socket
4128 * @sockb: second socket
4130 * Check permissions before creating a fresh pair of sockets.
4132 * Return: Returns 0 if permission is granted and the connection was
4135 int security_socket_socketpair(struct socket *socka, struct socket *sockb)
4137 return call_int_hook(socket_socketpair, 0, socka, sockb);
4139 EXPORT_SYMBOL(security_socket_socketpair);
4142 * security_socket_bind() - Check if a socket bind operation is allowed
4144 * @address: requested bind address
4145 * @addrlen: length of address
4147 * Check permission before socket protocol layer bind operation is performed
4148 * and the socket @sock is bound to the address specified in the @address
4151 * Return: Returns 0 if permission is granted.
4153 int security_socket_bind(struct socket *sock,
4154 struct sockaddr *address, int addrlen)
4156 return call_int_hook(socket_bind, 0, sock, address, addrlen);
4160 * security_socket_connect() - Check if a socket connect operation is allowed
4162 * @address: address of remote connection point
4163 * @addrlen: length of address
4165 * Check permission before socket protocol layer connect operation attempts to
4166 * connect socket @sock to a remote address, @address.
4168 * Return: Returns 0 if permission is granted.
4170 int security_socket_connect(struct socket *sock,
4171 struct sockaddr *address, int addrlen)
4173 return call_int_hook(socket_connect, 0, sock, address, addrlen);
4177 * security_socket_listen() - Check if a socket is allowed to listen
4179 * @backlog: connection queue size
4181 * Check permission before socket protocol layer listen operation.
4183 * Return: Returns 0 if permission is granted.
4185 int security_socket_listen(struct socket *sock, int backlog)
4187 return call_int_hook(socket_listen, 0, sock, backlog);
4191 * security_socket_accept() - Check if a socket is allowed to accept connections
4192 * @sock: listening socket
4193 * @newsock: newly creation connection socket
4195 * Check permission before accepting a new connection. Note that the new
4196 * socket, @newsock, has been created and some information copied to it, but
4197 * the accept operation has not actually been performed.
4199 * Return: Returns 0 if permission is granted.
4201 int security_socket_accept(struct socket *sock, struct socket *newsock)
4203 return call_int_hook(socket_accept, 0, sock, newsock);
4207 * security_socket_sendmsg() - Check is sending a message is allowed
4208 * @sock: sending socket
4209 * @msg: message to send
4210 * @size: size of message
4212 * Check permission before transmitting a message to another socket.
4214 * Return: Returns 0 if permission is granted.
4216 int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
4218 return call_int_hook(socket_sendmsg, 0, sock, msg, size);
4222 * security_socket_recvmsg() - Check if receiving a message is allowed
4223 * @sock: receiving socket
4224 * @msg: message to receive
4225 * @size: size of message
4226 * @flags: operational flags
4228 * Check permission before receiving a message from a socket.
4230 * Return: Returns 0 if permission is granted.
4232 int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
4233 int size, int flags)
4235 return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags);
4239 * security_socket_getsockname() - Check if reading the socket addr is allowed
4242 * Check permission before reading the local address (name) of the socket
4245 * Return: Returns 0 if permission is granted.
4247 int security_socket_getsockname(struct socket *sock)
4249 return call_int_hook(socket_getsockname, 0, sock);
4253 * security_socket_getpeername() - Check if reading the peer's addr is allowed
4256 * Check permission before the remote address (name) of a socket object.
4258 * Return: Returns 0 if permission is granted.
4260 int security_socket_getpeername(struct socket *sock)
4262 return call_int_hook(socket_getpeername, 0, sock);
4266 * security_socket_getsockopt() - Check if reading a socket option is allowed
4268 * @level: option's protocol level
4269 * @optname: option name
4271 * Check permissions before retrieving the options associated with socket
4274 * Return: Returns 0 if permission is granted.
4276 int security_socket_getsockopt(struct socket *sock, int level, int optname)
4278 return call_int_hook(socket_getsockopt, 0, sock, level, optname);
4282 * security_socket_setsockopt() - Check if setting a socket option is allowed
4284 * @level: option's protocol level
4285 * @optname: option name
4287 * Check permissions before setting the options associated with socket @sock.
4289 * Return: Returns 0 if permission is granted.
4291 int security_socket_setsockopt(struct socket *sock, int level, int optname)
4293 return call_int_hook(socket_setsockopt, 0, sock, level, optname);
4297 * security_socket_shutdown() - Checks if shutting down the socket is allowed
4299 * @how: flag indicating how sends and receives are handled
4301 * Checks permission before all or part of a connection on the socket @sock is
4304 * Return: Returns 0 if permission is granted.
4306 int security_socket_shutdown(struct socket *sock, int how)
4308 return call_int_hook(socket_shutdown, 0, sock, how);
4312 * security_sock_rcv_skb() - Check if an incoming network packet is allowed
4313 * @sk: destination sock
4314 * @skb: incoming packet
4316 * Check permissions on incoming network packets. This hook is distinct from
4317 * Netfilter's IP input hooks since it is the first time that the incoming
4318 * sk_buff @skb has been associated with a particular socket, @sk. Must not
4319 * sleep inside this hook because some callers hold spinlocks.
4321 * Return: Returns 0 if permission is granted.
4323 int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
4325 return call_int_hook(socket_sock_rcv_skb, 0, sk, skb);
4327 EXPORT_SYMBOL(security_sock_rcv_skb);
4330 * security_socket_getpeersec_stream() - Get the remote peer label
4332 * @optval: destination buffer
4333 * @optlen: size of peer label copied into the buffer
4334 * @len: maximum size of the destination buffer
4336 * This hook allows the security module to provide peer socket security state
4337 * for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
4338 * For tcp sockets this can be meaningful if the socket is associated with an
4341 * Return: Returns 0 if all is well, otherwise, typical getsockopt return
4344 int security_socket_getpeersec_stream(struct socket *sock, sockptr_t optval,
4345 sockptr_t optlen, unsigned int len)
4347 return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
4348 optval, optlen, len);
4352 * security_socket_getpeersec_dgram() - Get the remote peer label
4354 * @skb: datagram packet
4355 * @secid: remote peer label secid
4357 * This hook allows the security module to provide peer socket security state
4358 * for udp sockets on a per-packet basis to userspace via getsockopt
4359 * SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
4360 * option via getsockopt. It can then retrieve the security state returned by
4361 * this hook for a packet via the SCM_SECURITY ancillary message type.
4363 * Return: Returns 0 on success, error on failure.
4365 int security_socket_getpeersec_dgram(struct socket *sock,
4366 struct sk_buff *skb, u32 *secid)
4368 return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock,
4371 EXPORT_SYMBOL(security_socket_getpeersec_dgram);
4374 * security_sk_alloc() - Allocate and initialize a sock's LSM blob
4376 * @family: protocol family
4377 * @priority: gfp flags
4379 * Allocate and attach a security structure to the sk->sk_security field, which
4380 * is used to copy security attributes between local stream sockets.
4382 * Return: Returns 0 on success, error on failure.
4384 int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
4386 return call_int_hook(sk_alloc_security, 0, sk, family, priority);
4390 * security_sk_free() - Free the sock's LSM blob
4393 * Deallocate security structure.
4395 void security_sk_free(struct sock *sk)
4397 call_void_hook(sk_free_security, sk);
4401 * security_sk_clone() - Clone a sock's LSM state
4402 * @sk: original sock
4403 * @newsk: target sock
4405 * Clone/copy security structure.
4407 void security_sk_clone(const struct sock *sk, struct sock *newsk)
4409 call_void_hook(sk_clone_security, sk, newsk);
4411 EXPORT_SYMBOL(security_sk_clone);
4413 void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic)
4415 call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
4417 EXPORT_SYMBOL(security_sk_classify_flow);
4420 * security_req_classify_flow() - Set a flow's secid based on request_sock
4421 * @req: request_sock
4422 * @flic: target flow
4424 * Sets @flic's secid to @req's secid.
4426 void security_req_classify_flow(const struct request_sock *req,
4427 struct flowi_common *flic)
4429 call_void_hook(req_classify_flow, req, flic);
4431 EXPORT_SYMBOL(security_req_classify_flow);
4434 * security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
4435 * @sk: sock being grafted
4436 * @parent: target parent socket
4438 * Sets @parent's inode secid to @sk's secid and update @sk with any necessary
4439 * LSM state from @parent.
4441 void security_sock_graft(struct sock *sk, struct socket *parent)
4443 call_void_hook(sock_graft, sk, parent);
4445 EXPORT_SYMBOL(security_sock_graft);
4448 * security_inet_conn_request() - Set request_sock state using incoming connect
4449 * @sk: parent listening sock
4450 * @skb: incoming connection
4451 * @req: new request_sock
4453 * Initialize the @req LSM state based on @sk and the incoming connect in @skb.
4455 * Return: Returns 0 if permission is granted.
4457 int security_inet_conn_request(const struct sock *sk,
4458 struct sk_buff *skb, struct request_sock *req)
4460 return call_int_hook(inet_conn_request, 0, sk, skb, req);
4462 EXPORT_SYMBOL(security_inet_conn_request);
4465 * security_inet_csk_clone() - Set new sock LSM state based on request_sock
4467 * @req: connection request_sock
4469 * Set that LSM state of @sock using the LSM state from @req.
4471 void security_inet_csk_clone(struct sock *newsk,
4472 const struct request_sock *req)
4474 call_void_hook(inet_csk_clone, newsk, req);
4478 * security_inet_conn_established() - Update sock's LSM state with connection
4480 * @skb: connection packet
4482 * Update @sock's LSM state to represent a new connection from @skb.
4484 void security_inet_conn_established(struct sock *sk,
4485 struct sk_buff *skb)
4487 call_void_hook(inet_conn_established, sk, skb);
4489 EXPORT_SYMBOL(security_inet_conn_established);
4492 * security_secmark_relabel_packet() - Check if setting a secmark is allowed
4493 * @secid: new secmark value
4495 * Check if the process should be allowed to relabel packets to @secid.
4497 * Return: Returns 0 if permission is granted.
4499 int security_secmark_relabel_packet(u32 secid)
4501 return call_int_hook(secmark_relabel_packet, 0, secid);
4503 EXPORT_SYMBOL(security_secmark_relabel_packet);
4506 * security_secmark_refcount_inc() - Increment the secmark labeling rule count
4508 * Tells the LSM to increment the number of secmark labeling rules loaded.
4510 void security_secmark_refcount_inc(void)
4512 call_void_hook(secmark_refcount_inc);
4514 EXPORT_SYMBOL(security_secmark_refcount_inc);
4517 * security_secmark_refcount_dec() - Decrement the secmark labeling rule count
4519 * Tells the LSM to decrement the number of secmark labeling rules loaded.
4521 void security_secmark_refcount_dec(void)
4523 call_void_hook(secmark_refcount_dec);
4525 EXPORT_SYMBOL(security_secmark_refcount_dec);
4528 * security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
4529 * @security: pointer to the LSM blob
4531 * This hook allows a module to allocate a security structure for a TUN device,
4532 * returning the pointer in @security.
4534 * Return: Returns a zero on success, negative values on failure.
4536 int security_tun_dev_alloc_security(void **security)
4538 return call_int_hook(tun_dev_alloc_security, 0, security);
4540 EXPORT_SYMBOL(security_tun_dev_alloc_security);
4543 * security_tun_dev_free_security() - Free a TUN device LSM blob
4544 * @security: LSM blob
4546 * This hook allows a module to free the security structure for a TUN device.
4548 void security_tun_dev_free_security(void *security)
4550 call_void_hook(tun_dev_free_security, security);
4552 EXPORT_SYMBOL(security_tun_dev_free_security);
4555 * security_tun_dev_create() - Check if creating a TUN device is allowed
4557 * Check permissions prior to creating a new TUN device.
4559 * Return: Returns 0 if permission is granted.
4561 int security_tun_dev_create(void)
4563 return call_int_hook(tun_dev_create, 0);
4565 EXPORT_SYMBOL(security_tun_dev_create);
4568 * security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
4569 * @security: TUN device LSM blob
4571 * Check permissions prior to attaching to a TUN device queue.
4573 * Return: Returns 0 if permission is granted.
4575 int security_tun_dev_attach_queue(void *security)
4577 return call_int_hook(tun_dev_attach_queue, 0, security);
4579 EXPORT_SYMBOL(security_tun_dev_attach_queue);
4582 * security_tun_dev_attach() - Update TUN device LSM state on attach
4583 * @sk: associated sock
4584 * @security: TUN device LSM blob
4586 * This hook can be used by the module to update any security state associated
4587 * with the TUN device's sock structure.
4589 * Return: Returns 0 if permission is granted.
4591 int security_tun_dev_attach(struct sock *sk, void *security)
4593 return call_int_hook(tun_dev_attach, 0, sk, security);
4595 EXPORT_SYMBOL(security_tun_dev_attach);
4598 * security_tun_dev_open() - Update TUN device LSM state on open
4599 * @security: TUN device LSM blob
4601 * This hook can be used by the module to update any security state associated
4602 * with the TUN device's security structure.
4604 * Return: Returns 0 if permission is granted.
4606 int security_tun_dev_open(void *security)
4608 return call_int_hook(tun_dev_open, 0, security);
4610 EXPORT_SYMBOL(security_tun_dev_open);
4613 * security_sctp_assoc_request() - Update the LSM on a SCTP association req
4614 * @asoc: SCTP association
4615 * @skb: packet requesting the association
4617 * Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
4619 * Return: Returns 0 on success, error on failure.
4621 int security_sctp_assoc_request(struct sctp_association *asoc,
4622 struct sk_buff *skb)
4624 return call_int_hook(sctp_assoc_request, 0, asoc, skb);
4626 EXPORT_SYMBOL(security_sctp_assoc_request);
4629 * security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
4631 * @optname: SCTP option to validate
4632 * @address: list of IP addresses to validate
4633 * @addrlen: length of the address list
4635 * Validiate permissions required for each address associated with sock @sk.
4636 * Depending on @optname, the addresses will be treated as either a connect or
4637 * bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
4638 * sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
4640 * Return: Returns 0 on success, error on failure.
4642 int security_sctp_bind_connect(struct sock *sk, int optname,
4643 struct sockaddr *address, int addrlen)
4645 return call_int_hook(sctp_bind_connect, 0, sk, optname,
4648 EXPORT_SYMBOL(security_sctp_bind_connect);
4651 * security_sctp_sk_clone() - Clone a SCTP sock's LSM state
4652 * @asoc: SCTP association
4653 * @sk: original sock
4654 * @newsk: target sock
4656 * Called whenever a new socket is created by accept(2) (i.e. a TCP style
4657 * socket) or when a socket is 'peeled off' e.g userspace calls
4660 void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
4663 call_void_hook(sctp_sk_clone, asoc, sk, newsk);
4665 EXPORT_SYMBOL(security_sctp_sk_clone);
4668 * security_sctp_assoc_established() - Update LSM state when assoc established
4669 * @asoc: SCTP association
4670 * @skb: packet establishing the association
4672 * Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
4675 * Return: Returns 0 if permission is granted.
4677 int security_sctp_assoc_established(struct sctp_association *asoc,
4678 struct sk_buff *skb)
4680 return call_int_hook(sctp_assoc_established, 0, asoc, skb);
4682 EXPORT_SYMBOL(security_sctp_assoc_established);
4685 * security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
4686 * @sk: the owning MPTCP socket
4687 * @ssk: the new subflow
4689 * Update the labeling for the given MPTCP subflow, to match the one of the
4690 * owning MPTCP socket. This hook has to be called after the socket creation and
4691 * initialization via the security_socket_create() and
4692 * security_socket_post_create() LSM hooks.
4694 * Return: Returns 0 on success or a negative error code on failure.
4696 int security_mptcp_add_subflow(struct sock *sk, struct sock *ssk)
4698 return call_int_hook(mptcp_add_subflow, 0, sk, ssk);
4701 #endif /* CONFIG_SECURITY_NETWORK */
4703 #ifdef CONFIG_SECURITY_INFINIBAND
4705 * security_ib_pkey_access() - Check if access to an IB pkey is allowed
4707 * @subnet_prefix: subnet prefix of the port
4710 * Check permission to access a pkey when modifying a QP.
4712 * Return: Returns 0 if permission is granted.
4714 int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey)
4716 return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey);
4718 EXPORT_SYMBOL(security_ib_pkey_access);
4721 * security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
4723 * @dev_name: IB device name
4724 * @port_num: port number
4726 * Check permissions to send and receive SMPs on a end port.
4728 * Return: Returns 0 if permission is granted.
4730 int security_ib_endport_manage_subnet(void *sec,
4731 const char *dev_name, u8 port_num)
4733 return call_int_hook(ib_endport_manage_subnet, 0, sec,
4734 dev_name, port_num);
4736 EXPORT_SYMBOL(security_ib_endport_manage_subnet);
4739 * security_ib_alloc_security() - Allocate an Infiniband LSM blob
4742 * Allocate a security structure for Infiniband objects.
4744 * Return: Returns 0 on success, non-zero on failure.
4746 int security_ib_alloc_security(void **sec)
4748 return call_int_hook(ib_alloc_security, 0, sec);
4750 EXPORT_SYMBOL(security_ib_alloc_security);
4753 * security_ib_free_security() - Free an Infiniband LSM blob
4756 * Deallocate an Infiniband security structure.
4758 void security_ib_free_security(void *sec)
4760 call_void_hook(ib_free_security, sec);
4762 EXPORT_SYMBOL(security_ib_free_security);
4763 #endif /* CONFIG_SECURITY_INFINIBAND */
4765 #ifdef CONFIG_SECURITY_NETWORK_XFRM
4767 * security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
4768 * @ctxp: xfrm security context being added to the SPD
4769 * @sec_ctx: security label provided by userspace
4772 * Allocate a security structure to the xp->security field; the security field
4773 * is initialized to NULL when the xfrm_policy is allocated.
4775 * Return: Return 0 if operation was successful.
4777 int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
4778 struct xfrm_user_sec_ctx *sec_ctx,
4781 return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp);
4783 EXPORT_SYMBOL(security_xfrm_policy_alloc);
4786 * security_xfrm_policy_clone() - Clone xfrm policy LSM state
4787 * @old_ctx: xfrm security context
4788 * @new_ctxp: target xfrm security context
4790 * Allocate a security structure in new_ctxp that contains the information from
4791 * the old_ctx structure.
4793 * Return: Return 0 if operation was successful.
4795 int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
4796 struct xfrm_sec_ctx **new_ctxp)
4798 return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp);
4802 * security_xfrm_policy_free() - Free a xfrm security context
4803 * @ctx: xfrm security context
4805 * Free LSM resources associated with @ctx.
4807 void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
4809 call_void_hook(xfrm_policy_free_security, ctx);
4811 EXPORT_SYMBOL(security_xfrm_policy_free);
4814 * security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
4815 * @ctx: xfrm security context
4817 * Authorize deletion of a SPD entry.
4819 * Return: Returns 0 if permission is granted.
4821 int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
4823 return call_int_hook(xfrm_policy_delete_security, 0, ctx);
4827 * security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
4828 * @x: xfrm state being added to the SAD
4829 * @sec_ctx: security label provided by userspace
4831 * Allocate a security structure to the @x->security field; the security field
4832 * is initialized to NULL when the xfrm_state is allocated. Set the context to
4833 * correspond to @sec_ctx.
4835 * Return: Return 0 if operation was successful.
4837 int security_xfrm_state_alloc(struct xfrm_state *x,
4838 struct xfrm_user_sec_ctx *sec_ctx)
4840 return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx);
4842 EXPORT_SYMBOL(security_xfrm_state_alloc);
4845 * security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
4846 * @x: xfrm state being added to the SAD
4847 * @polsec: associated policy's security context
4848 * @secid: secid from the flow
4850 * Allocate a security structure to the x->security field; the security field
4851 * is initialized to NULL when the xfrm_state is allocated. Set the context to
4852 * correspond to secid.
4854 * Return: Returns 0 if operation was successful.
4856 int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
4857 struct xfrm_sec_ctx *polsec, u32 secid)
4859 return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid);
4863 * security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
4866 * Authorize deletion of x->security.
4868 * Return: Returns 0 if permission is granted.
4870 int security_xfrm_state_delete(struct xfrm_state *x)
4872 return call_int_hook(xfrm_state_delete_security, 0, x);
4874 EXPORT_SYMBOL(security_xfrm_state_delete);
4877 * security_xfrm_state_free() - Free a xfrm state
4880 * Deallocate x->security.
4882 void security_xfrm_state_free(struct xfrm_state *x)
4884 call_void_hook(xfrm_state_free_security, x);
4888 * security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
4889 * @ctx: target xfrm security context
4890 * @fl_secid: flow secid used to authorize access
4892 * Check permission when a flow selects a xfrm_policy for processing XFRMs on a
4893 * packet. The hook is called when selecting either a per-socket policy or a
4894 * generic xfrm policy.
4896 * Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
4899 int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
4901 return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid);
4905 * security_xfrm_state_pol_flow_match() - Check for a xfrm match
4906 * @x: xfrm state to match
4907 * @xp: xfrm policy to check for a match
4908 * @flic: flow to check for a match.
4910 * Check @xp and @flic for a match with @x.
4912 * Return: Returns 1 if there is a match.
4914 int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
4915 struct xfrm_policy *xp,
4916 const struct flowi_common *flic)
4918 struct security_hook_list *hp;
4919 int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match);
4922 * Since this function is expected to return 0 or 1, the judgment
4923 * becomes difficult if multiple LSMs supply this call. Fortunately,
4924 * we can use the first LSM's judgment because currently only SELinux
4925 * supplies this call.
4927 * For speed optimization, we explicitly break the loop rather than
4930 hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
4932 rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic);
4939 * security_xfrm_decode_session() - Determine the xfrm secid for a packet
4943 * Decode the packet in @skb and return the security label in @secid.
4945 * Return: Return 0 if all xfrms used have the same secid.
4947 int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
4949 return call_int_hook(xfrm_decode_session, 0, skb, secid, 1);
4952 void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic)
4954 int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid,
4959 EXPORT_SYMBOL(security_skb_classify_flow);
4960 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
4964 * security_key_alloc() - Allocate and initialize a kernel key LSM blob
4966 * @cred: credentials
4967 * @flags: allocation flags
4969 * Permit allocation of a key and assign security data. Note that key does not
4970 * have a serial number assigned at this point.
4972 * Return: Return 0 if permission is granted, -ve error otherwise.
4974 int security_key_alloc(struct key *key, const struct cred *cred,
4975 unsigned long flags)
4977 return call_int_hook(key_alloc, 0, key, cred, flags);
4981 * security_key_free() - Free a kernel key LSM blob
4984 * Notification of destruction; free security data.
4986 void security_key_free(struct key *key)
4988 call_void_hook(key_free, key);
4992 * security_key_permission() - Check if a kernel key operation is allowed
4993 * @key_ref: key reference
4994 * @cred: credentials of actor requesting access
4995 * @need_perm: requested permissions
4997 * See whether a specific operational right is granted to a process on a key.
4999 * Return: Return 0 if permission is granted, -ve error otherwise.
5001 int security_key_permission(key_ref_t key_ref, const struct cred *cred,
5002 enum key_need_perm need_perm)
5004 return call_int_hook(key_permission, 0, key_ref, cred, need_perm);
5008 * security_key_getsecurity() - Get the key's security label
5010 * @buffer: security label buffer
5012 * Get a textual representation of the security context attached to a key for
5013 * the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
5014 * storage for the NUL-terminated string and the caller should free it.
5016 * Return: Returns the length of @buffer (including terminating NUL) or -ve if
5017 * an error occurs. May also return 0 (and a NULL buffer pointer) if
5018 * there is no security label assigned to the key.
5020 int security_key_getsecurity(struct key *key, char **buffer)
5023 return call_int_hook(key_getsecurity, 0, key, buffer);
5025 #endif /* CONFIG_KEYS */
5029 * security_audit_rule_init() - Allocate and init an LSM audit rule struct
5030 * @field: audit action
5031 * @op: rule operator
5032 * @rulestr: rule context
5033 * @lsmrule: receive buffer for audit rule struct
5035 * Allocate and initialize an LSM audit rule structure.
5037 * Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
5040 int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
5042 return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule);
5046 * security_audit_rule_known() - Check if an audit rule contains LSM fields
5047 * @krule: audit rule
5049 * Specifies whether given @krule contains any fields related to the current
5052 * Return: Returns 1 in case of relation found, 0 otherwise.
5054 int security_audit_rule_known(struct audit_krule *krule)
5056 return call_int_hook(audit_rule_known, 0, krule);
5060 * security_audit_rule_free() - Free an LSM audit rule struct
5061 * @lsmrule: audit rule struct
5063 * Deallocate the LSM audit rule structure previously allocated by
5064 * audit_rule_init().
5066 void security_audit_rule_free(void *lsmrule)
5068 call_void_hook(audit_rule_free, lsmrule);
5072 * security_audit_rule_match() - Check if a label matches an audit rule
5073 * @secid: security label
5074 * @field: LSM audit field
5075 * @op: matching operator
5076 * @lsmrule: audit rule
5078 * Determine if given @secid matches a rule previously approved by
5079 * security_audit_rule_known().
5081 * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
5084 int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule)
5086 return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule);
5088 #endif /* CONFIG_AUDIT */
5090 #ifdef CONFIG_BPF_SYSCALL
5092 * security_bpf() - Check if the bpf syscall operation is allowed
5094 * @attr: bpf attribute
5097 * Do a initial check for all bpf syscalls after the attribute is copied into
5098 * the kernel. The actual security module can implement their own rules to
5099 * check the specific cmd they need.
5101 * Return: Returns 0 if permission is granted.
5103 int security_bpf(int cmd, union bpf_attr *attr, unsigned int size)
5105 return call_int_hook(bpf, 0, cmd, attr, size);
5109 * security_bpf_map() - Check if access to a bpf map is allowed
5113 * Do a check when the kernel generates and returns a file descriptor for eBPF
5116 * Return: Returns 0 if permission is granted.
5118 int security_bpf_map(struct bpf_map *map, fmode_t fmode)
5120 return call_int_hook(bpf_map, 0, map, fmode);
5124 * security_bpf_prog() - Check if access to a bpf program is allowed
5125 * @prog: bpf program
5127 * Do a check when the kernel generates and returns a file descriptor for eBPF
5130 * Return: Returns 0 if permission is granted.
5132 int security_bpf_prog(struct bpf_prog *prog)
5134 return call_int_hook(bpf_prog, 0, prog);
5138 * security_bpf_map_alloc() - Allocate a bpf map LSM blob
5141 * Initialize the security field inside bpf map.
5143 * Return: Returns 0 on success, error on failure.
5145 int security_bpf_map_alloc(struct bpf_map *map)
5147 return call_int_hook(bpf_map_alloc_security, 0, map);
5151 * security_bpf_prog_alloc() - Allocate a bpf program LSM blob
5152 * @aux: bpf program aux info struct
5154 * Initialize the security field inside bpf program.
5156 * Return: Returns 0 on success, error on failure.
5158 int security_bpf_prog_alloc(struct bpf_prog_aux *aux)
5160 return call_int_hook(bpf_prog_alloc_security, 0, aux);
5164 * security_bpf_map_free() - Free a bpf map's LSM blob
5167 * Clean up the security information stored inside bpf map.
5169 void security_bpf_map_free(struct bpf_map *map)
5171 call_void_hook(bpf_map_free_security, map);
5175 * security_bpf_prog_free() - Free a bpf program's LSM blob
5176 * @aux: bpf program aux info struct
5178 * Clean up the security information stored inside bpf prog.
5180 void security_bpf_prog_free(struct bpf_prog_aux *aux)
5182 call_void_hook(bpf_prog_free_security, aux);
5184 #endif /* CONFIG_BPF_SYSCALL */
5187 * security_locked_down() - Check if a kernel feature is allowed
5188 * @what: requested kernel feature
5190 * Determine whether a kernel feature that potentially enables arbitrary code
5191 * execution in kernel space should be permitted.
5193 * Return: Returns 0 if permission is granted.
5195 int security_locked_down(enum lockdown_reason what)
5197 return call_int_hook(locked_down, 0, what);
5199 EXPORT_SYMBOL(security_locked_down);
5201 #ifdef CONFIG_PERF_EVENTS
5203 * security_perf_event_open() - Check if a perf event open is allowed
5204 * @attr: perf event attribute
5205 * @type: type of event
5207 * Check whether the @type of perf_event_open syscall is allowed.
5209 * Return: Returns 0 if permission is granted.
5211 int security_perf_event_open(struct perf_event_attr *attr, int type)
5213 return call_int_hook(perf_event_open, 0, attr, type);
5217 * security_perf_event_alloc() - Allocate a perf event LSM blob
5218 * @event: perf event
5220 * Allocate and save perf_event security info.
5222 * Return: Returns 0 on success, error on failure.
5224 int security_perf_event_alloc(struct perf_event *event)
5226 return call_int_hook(perf_event_alloc, 0, event);
5230 * security_perf_event_free() - Free a perf event LSM blob
5231 * @event: perf event
5233 * Release (free) perf_event security info.
5235 void security_perf_event_free(struct perf_event *event)
5237 call_void_hook(perf_event_free, event);
5241 * security_perf_event_read() - Check if reading a perf event label is allowed
5242 * @event: perf event
5244 * Read perf_event security info if allowed.
5246 * Return: Returns 0 if permission is granted.
5248 int security_perf_event_read(struct perf_event *event)
5250 return call_int_hook(perf_event_read, 0, event);
5254 * security_perf_event_write() - Check if writing a perf event label is allowed
5255 * @event: perf event
5257 * Write perf_event security info if allowed.
5259 * Return: Returns 0 if permission is granted.
5261 int security_perf_event_write(struct perf_event *event)
5263 return call_int_hook(perf_event_write, 0, event);
5265 #endif /* CONFIG_PERF_EVENTS */
5267 #ifdef CONFIG_IO_URING
5269 * security_uring_override_creds() - Check if overriding creds is allowed
5270 * @new: new credentials
5272 * Check if the current task, executing an io_uring operation, is allowed to
5273 * override it's credentials with @new.
5275 * Return: Returns 0 if permission is granted.
5277 int security_uring_override_creds(const struct cred *new)
5279 return call_int_hook(uring_override_creds, 0, new);
5283 * security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
5285 * Check whether the current task is allowed to spawn a io_uring polling thread
5286 * (IORING_SETUP_SQPOLL).
5288 * Return: Returns 0 if permission is granted.
5290 int security_uring_sqpoll(void)
5292 return call_int_hook(uring_sqpoll, 0);
5296 * security_uring_cmd() - Check if a io_uring passthrough command is allowed
5299 * Check whether the file_operations uring_cmd is allowed to run.
5301 * Return: Returns 0 if permission is granted.
5303 int security_uring_cmd(struct io_uring_cmd *ioucmd)
5305 return call_int_hook(uring_cmd, 0, ioucmd);
5307 #endif /* CONFIG_IO_URING */