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/fsnotify.h>
23 #include <linux/mman.h>
24 #include <linux/mount.h>
25 #include <linux/personality.h>
26 #include <linux/backing-dev.h>
27 #include <linux/string.h>
28 #include <linux/xattr.h>
29 #include <linux/msg.h>
30 #include <linux/overflow.h>
33 /* How many LSMs were built into the kernel? */
34 #define LSM_COUNT (__end_lsm_info - __start_lsm_info)
37 * How many LSMs are built into the kernel as determined at
38 * build time. Used to determine fixed array sizes.
39 * The capability module is accounted for by CONFIG_SECURITY
41 #define LSM_CONFIG_COUNT ( \
42 (IS_ENABLED(CONFIG_SECURITY) ? 1 : 0) + \
43 (IS_ENABLED(CONFIG_SECURITY_SELINUX) ? 1 : 0) + \
44 (IS_ENABLED(CONFIG_SECURITY_SMACK) ? 1 : 0) + \
45 (IS_ENABLED(CONFIG_SECURITY_TOMOYO) ? 1 : 0) + \
46 (IS_ENABLED(CONFIG_SECURITY_APPARMOR) ? 1 : 0) + \
47 (IS_ENABLED(CONFIG_SECURITY_YAMA) ? 1 : 0) + \
48 (IS_ENABLED(CONFIG_SECURITY_LOADPIN) ? 1 : 0) + \
49 (IS_ENABLED(CONFIG_SECURITY_SAFESETID) ? 1 : 0) + \
50 (IS_ENABLED(CONFIG_SECURITY_LOCKDOWN_LSM) ? 1 : 0) + \
51 (IS_ENABLED(CONFIG_BPF_LSM) ? 1 : 0) + \
52 (IS_ENABLED(CONFIG_SECURITY_LANDLOCK) ? 1 : 0) + \
53 (IS_ENABLED(CONFIG_IMA) ? 1 : 0) + \
54 (IS_ENABLED(CONFIG_EVM) ? 1 : 0))
57 * These are descriptions of the reasons that can be passed to the
58 * security_locked_down() LSM hook. Placing this array here allows
59 * all security modules to use the same descriptions for auditing
62 const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX + 1] = {
63 [LOCKDOWN_NONE] = "none",
64 [LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading",
65 [LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port",
66 [LOCKDOWN_EFI_TEST] = "/dev/efi_test access",
67 [LOCKDOWN_KEXEC] = "kexec of unsigned images",
68 [LOCKDOWN_HIBERNATION] = "hibernation",
69 [LOCKDOWN_PCI_ACCESS] = "direct PCI access",
70 [LOCKDOWN_IOPORT] = "raw io port access",
71 [LOCKDOWN_MSR] = "raw MSR access",
72 [LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables",
73 [LOCKDOWN_DEVICE_TREE] = "modifying device tree contents",
74 [LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage",
75 [LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO",
76 [LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters",
77 [LOCKDOWN_MMIOTRACE] = "unsafe mmio",
78 [LOCKDOWN_DEBUGFS] = "debugfs access",
79 [LOCKDOWN_XMON_WR] = "xmon write access",
80 [LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM",
81 [LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM",
82 [LOCKDOWN_RTAS_ERROR_INJECTION] = "RTAS error injection",
83 [LOCKDOWN_INTEGRITY_MAX] = "integrity",
84 [LOCKDOWN_KCORE] = "/proc/kcore access",
85 [LOCKDOWN_KPROBES] = "use of kprobes",
86 [LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM",
87 [LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM",
88 [LOCKDOWN_PERF] = "unsafe use of perf",
89 [LOCKDOWN_TRACEFS] = "use of tracefs",
90 [LOCKDOWN_XMON_RW] = "xmon read and write access",
91 [LOCKDOWN_XFRM_SECRET] = "xfrm SA secret",
92 [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
95 struct security_hook_heads security_hook_heads __ro_after_init;
96 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain);
98 static struct kmem_cache *lsm_file_cache;
99 static struct kmem_cache *lsm_inode_cache;
102 static struct lsm_blob_sizes blob_sizes __ro_after_init;
104 /* Boot-time LSM user choice */
105 static __initdata const char *chosen_lsm_order;
106 static __initdata const char *chosen_major_lsm;
108 static __initconst const char *const builtin_lsm_order = CONFIG_LSM;
110 /* Ordered list of LSMs to initialize. */
111 static __initdata struct lsm_info **ordered_lsms;
112 static __initdata struct lsm_info *exclusive;
114 static __initdata bool debug;
115 #define init_debug(...) \
118 pr_info(__VA_ARGS__); \
121 static bool __init is_enabled(struct lsm_info *lsm)
126 return *lsm->enabled;
129 /* Mark an LSM's enabled flag. */
130 static int lsm_enabled_true __initdata = 1;
131 static int lsm_enabled_false __initdata = 0;
132 static void __init set_enabled(struct lsm_info *lsm, bool enabled)
135 * When an LSM hasn't configured an enable variable, we can use
136 * a hard-coded location for storing the default enabled state.
140 lsm->enabled = &lsm_enabled_true;
142 lsm->enabled = &lsm_enabled_false;
143 } else if (lsm->enabled == &lsm_enabled_true) {
145 lsm->enabled = &lsm_enabled_false;
146 } else if (lsm->enabled == &lsm_enabled_false) {
148 lsm->enabled = &lsm_enabled_true;
150 *lsm->enabled = enabled;
154 /* Is an LSM already listed in the ordered LSMs list? */
155 static bool __init exists_ordered_lsm(struct lsm_info *lsm)
157 struct lsm_info **check;
159 for (check = ordered_lsms; *check; check++)
166 /* Append an LSM to the list of ordered LSMs to initialize. */
167 static int last_lsm __initdata;
168 static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
170 /* Ignore duplicate selections. */
171 if (exists_ordered_lsm(lsm))
174 if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from))
177 /* Enable this LSM, if it is not already set. */
179 lsm->enabled = &lsm_enabled_true;
180 ordered_lsms[last_lsm++] = lsm;
182 init_debug("%s ordered: %s (%s)\n", from, lsm->name,
183 is_enabled(lsm) ? "enabled" : "disabled");
186 /* Is an LSM allowed to be initialized? */
187 static bool __init lsm_allowed(struct lsm_info *lsm)
189 /* Skip if the LSM is disabled. */
190 if (!is_enabled(lsm))
193 /* Not allowed if another exclusive LSM already initialized. */
194 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) {
195 init_debug("exclusive disabled: %s\n", lsm->name);
202 static void __init lsm_set_blob_size(int *need, int *lbs)
209 offset = ALIGN(*lbs, sizeof(void *));
210 *lbs = offset + *need;
214 static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
219 lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
220 lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file);
222 * The inode blob gets an rcu_head in addition to
223 * what the modules might need.
225 if (needed->lbs_inode && blob_sizes.lbs_inode == 0)
226 blob_sizes.lbs_inode = sizeof(struct rcu_head);
227 lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
228 lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
229 lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
230 lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
231 lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
232 lsm_set_blob_size(&needed->lbs_xattr_count,
233 &blob_sizes.lbs_xattr_count);
236 /* Prepare LSM for initialization. */
237 static void __init prepare_lsm(struct lsm_info *lsm)
239 int enabled = lsm_allowed(lsm);
241 /* Record enablement (to handle any following exclusive LSMs). */
242 set_enabled(lsm, enabled);
244 /* If enabled, do pre-initialization work. */
246 if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) {
248 init_debug("exclusive chosen: %s\n", lsm->name);
251 lsm_set_blob_sizes(lsm->blobs);
255 /* Initialize a given LSM, if it is enabled. */
256 static void __init initialize_lsm(struct lsm_info *lsm)
258 if (is_enabled(lsm)) {
261 init_debug("initializing %s\n", lsm->name);
263 WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
268 * Current index to use while initializing the lsm id list.
270 u32 lsm_active_cnt __ro_after_init;
271 const struct lsm_id *lsm_idlist[LSM_CONFIG_COUNT];
273 /* Populate ordered LSMs list from comma-separated LSM name list. */
274 static void __init ordered_lsm_parse(const char *order, const char *origin)
276 struct lsm_info *lsm;
277 char *sep, *name, *next;
279 /* LSM_ORDER_FIRST is always first. */
280 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
281 if (lsm->order == LSM_ORDER_FIRST)
282 append_ordered_lsm(lsm, " first");
285 /* Process "security=", if given. */
286 if (chosen_major_lsm) {
287 struct lsm_info *major;
290 * To match the original "security=" behavior, this
291 * explicitly does NOT fallback to another Legacy Major
292 * if the selected one was separately disabled: disable
293 * all non-matching Legacy Major LSMs.
295 for (major = __start_lsm_info; major < __end_lsm_info;
297 if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
298 strcmp(major->name, chosen_major_lsm) != 0) {
299 set_enabled(major, false);
300 init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
301 chosen_major_lsm, major->name);
306 sep = kstrdup(order, GFP_KERNEL);
308 /* Walk the list, looking for matching LSMs. */
309 while ((name = strsep(&next, ",")) != NULL) {
312 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
313 if (strcmp(lsm->name, name) == 0) {
314 if (lsm->order == LSM_ORDER_MUTABLE)
315 append_ordered_lsm(lsm, origin);
321 init_debug("%s ignored: %s (not built into kernel)\n",
325 /* Process "security=", if given. */
326 if (chosen_major_lsm) {
327 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
328 if (exists_ordered_lsm(lsm))
330 if (strcmp(lsm->name, chosen_major_lsm) == 0)
331 append_ordered_lsm(lsm, "security=");
335 /* LSM_ORDER_LAST is always last. */
336 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
337 if (lsm->order == LSM_ORDER_LAST)
338 append_ordered_lsm(lsm, " last");
341 /* Disable all LSMs not in the ordered list. */
342 for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
343 if (exists_ordered_lsm(lsm))
345 set_enabled(lsm, false);
346 init_debug("%s skipped: %s (not in requested order)\n",
353 static void __init lsm_early_cred(struct cred *cred);
354 static void __init lsm_early_task(struct task_struct *task);
356 static int lsm_append(const char *new, char **result);
358 static void __init report_lsm_order(void)
360 struct lsm_info **lsm, *early;
363 pr_info("initializing lsm=");
365 /* Report each enabled LSM name, comma separated. */
366 for (early = __start_early_lsm_info;
367 early < __end_early_lsm_info; early++)
368 if (is_enabled(early))
369 pr_cont("%s%s", first++ == 0 ? "" : ",", early->name);
370 for (lsm = ordered_lsms; *lsm; lsm++)
371 if (is_enabled(*lsm))
372 pr_cont("%s%s", first++ == 0 ? "" : ",", (*lsm)->name);
377 static void __init ordered_lsm_init(void)
379 struct lsm_info **lsm;
381 ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms),
384 if (chosen_lsm_order) {
385 if (chosen_major_lsm) {
386 pr_warn("security=%s is ignored because it is superseded by lsm=%s\n",
387 chosen_major_lsm, chosen_lsm_order);
388 chosen_major_lsm = NULL;
390 ordered_lsm_parse(chosen_lsm_order, "cmdline");
392 ordered_lsm_parse(builtin_lsm_order, "builtin");
394 for (lsm = ordered_lsms; *lsm; lsm++)
399 init_debug("cred blob size = %d\n", blob_sizes.lbs_cred);
400 init_debug("file blob size = %d\n", blob_sizes.lbs_file);
401 init_debug("inode blob size = %d\n", blob_sizes.lbs_inode);
402 init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc);
403 init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg);
404 init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
405 init_debug("task blob size = %d\n", blob_sizes.lbs_task);
406 init_debug("xattr slots = %d\n", blob_sizes.lbs_xattr_count);
409 * Create any kmem_caches needed for blobs
411 if (blob_sizes.lbs_file)
412 lsm_file_cache = kmem_cache_create("lsm_file_cache",
413 blob_sizes.lbs_file, 0,
415 if (blob_sizes.lbs_inode)
416 lsm_inode_cache = kmem_cache_create("lsm_inode_cache",
417 blob_sizes.lbs_inode, 0,
420 lsm_early_cred((struct cred *) current->cred);
421 lsm_early_task(current);
422 for (lsm = ordered_lsms; *lsm; lsm++)
423 initialize_lsm(*lsm);
428 int __init early_security_init(void)
430 struct lsm_info *lsm;
432 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
433 INIT_HLIST_HEAD(&security_hook_heads.NAME);
434 #include "linux/lsm_hook_defs.h"
437 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
439 lsm->enabled = &lsm_enabled_true;
448 * security_init - initializes the security framework
450 * This should be called early in the kernel initialization sequence.
452 int __init security_init(void)
454 struct lsm_info *lsm;
456 init_debug("legacy security=%s\n", chosen_major_lsm ? : " *unspecified*");
457 init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order);
458 init_debug("boot arg lsm=%s\n", chosen_lsm_order ? : " *unspecified*");
461 * Append the names of the early LSM modules now that kmalloc() is
464 for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
465 init_debug(" early started: %s (%s)\n", lsm->name,
466 is_enabled(lsm) ? "enabled" : "disabled");
468 lsm_append(lsm->name, &lsm_names);
471 /* Load LSMs in specified order. */
477 /* Save user chosen LSM */
478 static int __init choose_major_lsm(char *str)
480 chosen_major_lsm = str;
483 __setup("security=", choose_major_lsm);
485 /* Explicitly choose LSM initialization order. */
486 static int __init choose_lsm_order(char *str)
488 chosen_lsm_order = str;
491 __setup("lsm=", choose_lsm_order);
493 /* Enable LSM order debugging. */
494 static int __init enable_debug(char *str)
499 __setup("lsm.debug", enable_debug);
501 static bool match_last_lsm(const char *list, const char *lsm)
505 if (WARN_ON(!list || !lsm))
507 last = strrchr(list, ',');
509 /* Pass the comma, strcmp() will check for '\0' */
513 return !strcmp(last, lsm);
516 static int lsm_append(const char *new, char **result)
520 if (*result == NULL) {
521 *result = kstrdup(new, GFP_KERNEL);
525 /* Check if it is the last registered name */
526 if (match_last_lsm(*result, new))
528 cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
538 * security_add_hooks - Add a modules hooks to the hook lists.
539 * @hooks: the hooks to add
540 * @count: the number of hooks to add
541 * @lsmid: the identification information for the security module
543 * Each LSM has to register its hooks with the infrastructure.
545 void __init security_add_hooks(struct security_hook_list *hooks, int count,
546 const struct lsm_id *lsmid)
551 * A security module may call security_add_hooks() more
552 * than once during initialization, and LSM initialization
553 * is serialized. Landlock is one such case.
554 * Look at the previous entry, if there is one, for duplication.
556 if (lsm_active_cnt == 0 || lsm_idlist[lsm_active_cnt - 1] != lsmid) {
557 if (lsm_active_cnt >= LSM_CONFIG_COUNT)
558 panic("%s Too many LSMs registered.\n", __func__);
559 lsm_idlist[lsm_active_cnt++] = lsmid;
562 for (i = 0; i < count; i++) {
563 hooks[i].lsmid = lsmid;
564 hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
568 * Don't try to append during early_security_init(), we'll come back
569 * and fix this up afterwards.
571 if (slab_is_available()) {
572 if (lsm_append(lsmid->name, &lsm_names) < 0)
573 panic("%s - Cannot get early memory.\n", __func__);
577 int call_blocking_lsm_notifier(enum lsm_event event, void *data)
579 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain,
582 EXPORT_SYMBOL(call_blocking_lsm_notifier);
584 int register_blocking_lsm_notifier(struct notifier_block *nb)
586 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain,
589 EXPORT_SYMBOL(register_blocking_lsm_notifier);
591 int unregister_blocking_lsm_notifier(struct notifier_block *nb)
593 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain,
596 EXPORT_SYMBOL(unregister_blocking_lsm_notifier);
599 * lsm_cred_alloc - allocate a composite cred blob
600 * @cred: the cred that needs a blob
601 * @gfp: allocation type
603 * Allocate the cred blob for all the modules
605 * Returns 0, or -ENOMEM if memory can't be allocated.
607 static int lsm_cred_alloc(struct cred *cred, gfp_t gfp)
609 if (blob_sizes.lbs_cred == 0) {
610 cred->security = NULL;
614 cred->security = kzalloc(blob_sizes.lbs_cred, gfp);
615 if (cred->security == NULL)
621 * lsm_early_cred - during initialization allocate a composite cred blob
622 * @cred: the cred that needs a blob
624 * Allocate the cred blob for all the modules
626 static void __init lsm_early_cred(struct cred *cred)
628 int rc = lsm_cred_alloc(cred, GFP_KERNEL);
631 panic("%s: Early cred alloc failed.\n", __func__);
635 * lsm_file_alloc - allocate a composite file blob
636 * @file: the file that needs a blob
638 * Allocate the file blob for all the modules
640 * Returns 0, or -ENOMEM if memory can't be allocated.
642 static int lsm_file_alloc(struct file *file)
644 if (!lsm_file_cache) {
645 file->f_security = NULL;
649 file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL);
650 if (file->f_security == NULL)
656 * lsm_inode_alloc - allocate a composite inode blob
657 * @inode: the inode that needs a blob
659 * Allocate the inode blob for all the modules
661 * Returns 0, or -ENOMEM if memory can't be allocated.
663 int lsm_inode_alloc(struct inode *inode)
665 if (!lsm_inode_cache) {
666 inode->i_security = NULL;
670 inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS);
671 if (inode->i_security == NULL)
677 * lsm_task_alloc - allocate a composite task blob
678 * @task: the task that needs a blob
680 * Allocate the task blob for all the modules
682 * Returns 0, or -ENOMEM if memory can't be allocated.
684 static int lsm_task_alloc(struct task_struct *task)
686 if (blob_sizes.lbs_task == 0) {
687 task->security = NULL;
691 task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
692 if (task->security == NULL)
698 * lsm_ipc_alloc - allocate a composite ipc blob
699 * @kip: the ipc that needs a blob
701 * Allocate the ipc blob for all the modules
703 * Returns 0, or -ENOMEM if memory can't be allocated.
705 static int lsm_ipc_alloc(struct kern_ipc_perm *kip)
707 if (blob_sizes.lbs_ipc == 0) {
708 kip->security = NULL;
712 kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL);
713 if (kip->security == NULL)
719 * lsm_msg_msg_alloc - allocate a composite msg_msg blob
720 * @mp: the msg_msg that needs a blob
722 * Allocate the ipc blob for all the modules
724 * Returns 0, or -ENOMEM if memory can't be allocated.
726 static int lsm_msg_msg_alloc(struct msg_msg *mp)
728 if (blob_sizes.lbs_msg_msg == 0) {
733 mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL);
734 if (mp->security == NULL)
740 * lsm_early_task - during initialization allocate a composite task blob
741 * @task: the task that needs a blob
743 * Allocate the task blob for all the modules
745 static void __init lsm_early_task(struct task_struct *task)
747 int rc = lsm_task_alloc(task);
750 panic("%s: Early task alloc failed.\n", __func__);
754 * lsm_superblock_alloc - allocate a composite superblock blob
755 * @sb: the superblock that needs a blob
757 * Allocate the superblock blob for all the modules
759 * Returns 0, or -ENOMEM if memory can't be allocated.
761 static int lsm_superblock_alloc(struct super_block *sb)
763 if (blob_sizes.lbs_superblock == 0) {
764 sb->s_security = NULL;
768 sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL);
769 if (sb->s_security == NULL)
775 * lsm_fill_user_ctx - Fill a user space lsm_ctx structure
776 * @uctx: a userspace LSM context to be filled
777 * @uctx_len: available uctx size (input), used uctx size (output)
778 * @val: the new LSM context value
779 * @val_len: the size of the new LSM context value
781 * @flags: LSM defined flags
783 * Fill all of the fields in a userspace lsm_ctx structure. If @uctx is NULL
784 * simply calculate the required size to output via @utc_len and return
787 * Returns 0 on success, -E2BIG if userspace buffer is not large enough,
788 * -EFAULT on a copyout error, -ENOMEM if memory can't be allocated.
790 int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, u32 *uctx_len,
791 void *val, size_t val_len,
794 struct lsm_ctx *nctx = NULL;
798 nctx_len = ALIGN(struct_size(nctx, ctx, val_len), sizeof(void *));
799 if (nctx_len > *uctx_len) {
804 /* no buffer - return success/0 and set @uctx_len to the req size */
808 nctx = kzalloc(nctx_len, GFP_KERNEL);
815 nctx->len = nctx_len;
816 nctx->ctx_len = val_len;
817 memcpy(nctx->ctx, val, val_len);
819 if (copy_to_user(uctx, nctx, nctx_len))
824 *uctx_len = nctx_len;
829 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
830 * can be accessed with:
832 * LSM_RET_DEFAULT(<hook_name>)
834 * The macros below define static constants for the default value of each
837 #define LSM_RET_DEFAULT(NAME) (NAME##_default)
838 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
839 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
840 static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
841 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
842 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
844 #include <linux/lsm_hook_defs.h>
848 * Hook list operation macros.
851 * This is a hook that does not return a value.
854 * This is a hook that returns a value.
857 #define call_void_hook(FUNC, ...) \
859 struct security_hook_list *P; \
861 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
862 P->hook.FUNC(__VA_ARGS__); \
865 #define call_int_hook(FUNC, ...) ({ \
866 int RC = LSM_RET_DEFAULT(FUNC); \
868 struct security_hook_list *P; \
870 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
871 RC = P->hook.FUNC(__VA_ARGS__); \
872 if (RC != LSM_RET_DEFAULT(FUNC)) \
879 /* Security operations */
882 * security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
883 * @mgr: task credentials of current binder process
885 * Check whether @mgr is allowed to be the binder context manager.
887 * Return: Return 0 if permission is granted.
889 int security_binder_set_context_mgr(const struct cred *mgr)
891 return call_int_hook(binder_set_context_mgr, mgr);
895 * security_binder_transaction() - Check if a binder transaction is allowed
896 * @from: sending process
897 * @to: receiving process
899 * Check whether @from is allowed to invoke a binder transaction call to @to.
901 * Return: Returns 0 if permission is granted.
903 int security_binder_transaction(const struct cred *from,
904 const struct cred *to)
906 return call_int_hook(binder_transaction, from, to);
910 * security_binder_transfer_binder() - Check if a binder transfer is allowed
911 * @from: sending process
912 * @to: receiving process
914 * Check whether @from is allowed to transfer a binder reference to @to.
916 * Return: Returns 0 if permission is granted.
918 int security_binder_transfer_binder(const struct cred *from,
919 const struct cred *to)
921 return call_int_hook(binder_transfer_binder, from, to);
925 * security_binder_transfer_file() - Check if a binder file xfer is allowed
926 * @from: sending process
927 * @to: receiving process
928 * @file: file being transferred
930 * Check whether @from is allowed to transfer @file to @to.
932 * Return: Returns 0 if permission is granted.
934 int security_binder_transfer_file(const struct cred *from,
935 const struct cred *to, const struct file *file)
937 return call_int_hook(binder_transfer_file, from, to, file);
941 * security_ptrace_access_check() - Check if tracing is allowed
942 * @child: target process
943 * @mode: PTRACE_MODE flags
945 * Check permission before allowing the current process to trace the @child
946 * process. Security modules may also want to perform a process tracing check
947 * during an execve in the set_security or apply_creds hooks of tracing check
948 * during an execve in the bprm_set_creds hook of binprm_security_ops if the
949 * process is being traced and its security attributes would be changed by the
952 * Return: Returns 0 if permission is granted.
954 int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
956 return call_int_hook(ptrace_access_check, child, mode);
960 * security_ptrace_traceme() - Check if tracing is allowed
961 * @parent: tracing process
963 * Check that the @parent process has sufficient permission to trace the
964 * current process before allowing the current process to present itself to the
965 * @parent process for tracing.
967 * Return: Returns 0 if permission is granted.
969 int security_ptrace_traceme(struct task_struct *parent)
971 return call_int_hook(ptrace_traceme, parent);
975 * security_capget() - Get the capability sets for a process
976 * @target: target process
977 * @effective: effective capability set
978 * @inheritable: inheritable capability set
979 * @permitted: permitted capability set
981 * Get the @effective, @inheritable, and @permitted capability sets for the
982 * @target process. The hook may also perform permission checking to determine
983 * if the current process is allowed to see the capability sets of the @target
986 * Return: Returns 0 if the capability sets were successfully obtained.
988 int security_capget(const struct task_struct *target,
989 kernel_cap_t *effective,
990 kernel_cap_t *inheritable,
991 kernel_cap_t *permitted)
993 return call_int_hook(capget, target, effective, inheritable, permitted);
997 * security_capset() - Set the capability sets for a process
998 * @new: new credentials for the target process
999 * @old: current credentials of the target process
1000 * @effective: effective capability set
1001 * @inheritable: inheritable capability set
1002 * @permitted: permitted capability set
1004 * Set the @effective, @inheritable, and @permitted capability sets for the
1007 * Return: Returns 0 and update @new if permission is granted.
1009 int security_capset(struct cred *new, const struct cred *old,
1010 const kernel_cap_t *effective,
1011 const kernel_cap_t *inheritable,
1012 const kernel_cap_t *permitted)
1014 return call_int_hook(capset, new, old, effective, inheritable,
1019 * security_capable() - Check if a process has the necessary capability
1020 * @cred: credentials to examine
1021 * @ns: user namespace
1022 * @cap: capability requested
1023 * @opts: capability check options
1025 * Check whether the @tsk process has the @cap capability in the indicated
1026 * credentials. @cap contains the capability <include/linux/capability.h>.
1027 * @opts contains options for the capable check <include/linux/security.h>.
1029 * Return: Returns 0 if the capability is granted.
1031 int security_capable(const struct cred *cred,
1032 struct user_namespace *ns,
1036 return call_int_hook(capable, cred, ns, cap, opts);
1040 * security_quotactl() - Check if a quotactl() syscall is allowed for this fs
1046 * Check whether the quotactl syscall is allowed for this @sb.
1048 * Return: Returns 0 if permission is granted.
1050 int security_quotactl(int cmds, int type, int id, const struct super_block *sb)
1052 return call_int_hook(quotactl, cmds, type, id, sb);
1056 * security_quota_on() - Check if QUOTAON is allowed for a dentry
1059 * Check whether QUOTAON is allowed for @dentry.
1061 * Return: Returns 0 if permission is granted.
1063 int security_quota_on(struct dentry *dentry)
1065 return call_int_hook(quota_on, dentry);
1069 * security_syslog() - Check if accessing the kernel message ring is allowed
1070 * @type: SYSLOG_ACTION_* type
1072 * Check permission before accessing the kernel message ring or changing
1073 * logging to the console. See the syslog(2) manual page for an explanation of
1076 * Return: Return 0 if permission is granted.
1078 int security_syslog(int type)
1080 return call_int_hook(syslog, type);
1084 * security_settime64() - Check if changing the system time is allowed
1088 * Check permission to change the system time, struct timespec64 is defined in
1089 * <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
1091 * Return: Returns 0 if permission is granted.
1093 int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
1095 return call_int_hook(settime, ts, tz);
1099 * security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
1101 * @pages: number of pages
1103 * Check permissions for allocating a new virtual mapping. If all LSMs return
1104 * a positive value, __vm_enough_memory() will be called with cap_sys_admin
1105 * set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
1106 * called with cap_sys_admin cleared.
1108 * Return: Returns 0 if permission is granted by the LSM infrastructure to the
1111 int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
1113 struct security_hook_list *hp;
1114 int cap_sys_admin = 1;
1118 * The module will respond with a positive value if
1119 * it thinks the __vm_enough_memory() call should be
1120 * made with the cap_sys_admin set. If all of the modules
1121 * agree that it should be set it will. If any module
1122 * thinks it should not be set it won't.
1124 hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
1125 rc = hp->hook.vm_enough_memory(mm, pages);
1131 return __vm_enough_memory(mm, pages, cap_sys_admin);
1135 * security_bprm_creds_for_exec() - Prepare the credentials for exec()
1136 * @bprm: binary program information
1138 * If the setup in prepare_exec_creds did not setup @bprm->cred->security
1139 * properly for executing @bprm->file, update the LSM's portion of
1140 * @bprm->cred->security to be what commit_creds needs to install for the new
1141 * program. This hook may also optionally check permissions (e.g. for
1142 * transitions between security domains). The hook must set @bprm->secureexec
1143 * to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
1144 * contains the linux_binprm structure.
1146 * Return: Returns 0 if the hook is successful and permission is granted.
1148 int security_bprm_creds_for_exec(struct linux_binprm *bprm)
1150 return call_int_hook(bprm_creds_for_exec, bprm);
1154 * security_bprm_creds_from_file() - Update linux_binprm creds based on file
1155 * @bprm: binary program information
1156 * @file: associated file
1158 * If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
1159 * exec, update @bprm->cred to reflect that change. This is called after
1160 * finding the binary that will be executed without an interpreter. This
1161 * ensures that the credentials will not be derived from a script that the
1162 * binary will need to reopen, which when reopend may end up being a completely
1163 * different file. This hook may also optionally check permissions (e.g. for
1164 * transitions between security domains). The hook must set @bprm->secureexec
1165 * to 1 if AT_SECURE should be set to request libc enable secure mode. The
1166 * hook must add to @bprm->per_clear any personality flags that should be
1167 * cleared from current->personality. @bprm contains the linux_binprm
1170 * Return: Returns 0 if the hook is successful and permission is granted.
1172 int security_bprm_creds_from_file(struct linux_binprm *bprm, const struct file *file)
1174 return call_int_hook(bprm_creds_from_file, bprm, file);
1178 * security_bprm_check() - Mediate binary handler search
1179 * @bprm: binary program information
1181 * This hook mediates the point when a search for a binary handler will begin.
1182 * It allows a check against the @bprm->cred->security value which was set in
1183 * the preceding creds_for_exec call. The argv list and envp list are reliably
1184 * available in @bprm. This hook may be called multiple times during a single
1185 * execve. @bprm contains the linux_binprm structure.
1187 * Return: Returns 0 if the hook is successful and permission is granted.
1189 int security_bprm_check(struct linux_binprm *bprm)
1191 return call_int_hook(bprm_check_security, bprm);
1195 * security_bprm_committing_creds() - Install creds for a process during exec()
1196 * @bprm: binary program information
1198 * Prepare to install the new security attributes of a process being
1199 * transformed by an execve operation, based on the old credentials pointed to
1200 * by @current->cred and the information set in @bprm->cred by the
1201 * bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
1202 * hook is a good place to perform state changes on the process such as closing
1203 * open file descriptors to which access will no longer be granted when the
1204 * attributes are changed. This is called immediately before commit_creds().
1206 void security_bprm_committing_creds(const struct linux_binprm *bprm)
1208 call_void_hook(bprm_committing_creds, bprm);
1212 * security_bprm_committed_creds() - Tidy up after cred install during exec()
1213 * @bprm: binary program information
1215 * Tidy up after the installation of the new security attributes of a process
1216 * being transformed by an execve operation. The new credentials have, by this
1217 * point, been set to @current->cred. @bprm points to the linux_binprm
1218 * structure. This hook is a good place to perform state changes on the
1219 * process such as clearing out non-inheritable signal state. This is called
1220 * immediately after commit_creds().
1222 void security_bprm_committed_creds(const struct linux_binprm *bprm)
1224 call_void_hook(bprm_committed_creds, bprm);
1228 * security_fs_context_submount() - Initialise fc->security
1229 * @fc: new filesystem context
1230 * @reference: dentry reference for submount/remount
1232 * Fill out the ->security field for a new fs_context.
1234 * Return: Returns 0 on success or negative error code on failure.
1236 int security_fs_context_submount(struct fs_context *fc, struct super_block *reference)
1238 return call_int_hook(fs_context_submount, fc, reference);
1242 * security_fs_context_dup() - Duplicate a fs_context LSM blob
1243 * @fc: destination filesystem context
1244 * @src_fc: source filesystem context
1246 * Allocate and attach a security structure to sc->security. This pointer is
1247 * initialised to NULL by the caller. @fc indicates the new filesystem context.
1248 * @src_fc indicates the original filesystem context.
1250 * Return: Returns 0 on success or a negative error code on failure.
1252 int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1254 return call_int_hook(fs_context_dup, fc, src_fc);
1258 * security_fs_context_parse_param() - Configure a filesystem context
1259 * @fc: filesystem context
1260 * @param: filesystem parameter
1262 * Userspace provided a parameter to configure a superblock. The LSM can
1263 * consume the parameter or return it to the caller for use elsewhere.
1265 * Return: If the parameter is used by the LSM it should return 0, if it is
1266 * returned to the caller -ENOPARAM is returned, otherwise a negative
1267 * error code is returned.
1269 int security_fs_context_parse_param(struct fs_context *fc,
1270 struct fs_parameter *param)
1272 struct security_hook_list *hp;
1276 hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param,
1278 trc = hp->hook.fs_context_parse_param(fc, param);
1281 else if (trc != -ENOPARAM)
1288 * security_sb_alloc() - Allocate a super_block LSM blob
1289 * @sb: filesystem superblock
1291 * Allocate and attach a security structure to the sb->s_security field. The
1292 * s_security field is initialized to NULL when the structure is allocated.
1293 * @sb contains the super_block structure to be modified.
1295 * Return: Returns 0 if operation was successful.
1297 int security_sb_alloc(struct super_block *sb)
1299 int rc = lsm_superblock_alloc(sb);
1303 rc = call_int_hook(sb_alloc_security, sb);
1305 security_sb_free(sb);
1310 * security_sb_delete() - Release super_block LSM associated objects
1311 * @sb: filesystem superblock
1313 * Release objects tied to a superblock (e.g. inodes). @sb contains the
1314 * super_block structure being released.
1316 void security_sb_delete(struct super_block *sb)
1318 call_void_hook(sb_delete, sb);
1322 * security_sb_free() - Free a super_block LSM blob
1323 * @sb: filesystem superblock
1325 * Deallocate and clear the sb->s_security field. @sb contains the super_block
1326 * structure to be modified.
1328 void security_sb_free(struct super_block *sb)
1330 call_void_hook(sb_free_security, sb);
1331 kfree(sb->s_security);
1332 sb->s_security = NULL;
1336 * security_free_mnt_opts() - Free memory associated with mount options
1337 * @mnt_opts: LSM processed mount options
1339 * Free memory associated with @mnt_ops.
1341 void security_free_mnt_opts(void **mnt_opts)
1345 call_void_hook(sb_free_mnt_opts, *mnt_opts);
1348 EXPORT_SYMBOL(security_free_mnt_opts);
1351 * security_sb_eat_lsm_opts() - Consume LSM mount options
1352 * @options: mount options
1353 * @mnt_opts: LSM processed mount options
1355 * Eat (scan @options) and save them in @mnt_opts.
1357 * Return: Returns 0 on success, negative values on failure.
1359 int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
1361 return call_int_hook(sb_eat_lsm_opts, options, mnt_opts);
1363 EXPORT_SYMBOL(security_sb_eat_lsm_opts);
1366 * security_sb_mnt_opts_compat() - Check if new mount options are allowed
1367 * @sb: filesystem superblock
1368 * @mnt_opts: new mount options
1370 * Determine if the new mount options in @mnt_opts are allowed given the
1371 * existing mounted filesystem at @sb. @sb superblock being compared.
1373 * Return: Returns 0 if options are compatible.
1375 int security_sb_mnt_opts_compat(struct super_block *sb,
1378 return call_int_hook(sb_mnt_opts_compat, sb, mnt_opts);
1380 EXPORT_SYMBOL(security_sb_mnt_opts_compat);
1383 * security_sb_remount() - Verify no incompatible mount changes during remount
1384 * @sb: filesystem superblock
1385 * @mnt_opts: (re)mount options
1387 * Extracts security system specific mount options and verifies no changes are
1388 * being made to those options.
1390 * Return: Returns 0 if permission is granted.
1392 int security_sb_remount(struct super_block *sb,
1395 return call_int_hook(sb_remount, sb, mnt_opts);
1397 EXPORT_SYMBOL(security_sb_remount);
1400 * security_sb_kern_mount() - Check if a kernel mount is allowed
1401 * @sb: filesystem superblock
1403 * Mount this @sb if allowed by permissions.
1405 * Return: Returns 0 if permission is granted.
1407 int security_sb_kern_mount(const struct super_block *sb)
1409 return call_int_hook(sb_kern_mount, sb);
1413 * security_sb_show_options() - Output the mount options for a superblock
1415 * @sb: filesystem superblock
1417 * Show (print on @m) mount options for this @sb.
1419 * Return: Returns 0 on success, negative values on failure.
1421 int security_sb_show_options(struct seq_file *m, struct super_block *sb)
1423 return call_int_hook(sb_show_options, m, sb);
1427 * security_sb_statfs() - Check if accessing fs stats is allowed
1428 * @dentry: superblock handle
1430 * Check permission before obtaining filesystem statistics for the @mnt
1431 * mountpoint. @dentry is a handle on the superblock for the filesystem.
1433 * Return: Returns 0 if permission is granted.
1435 int security_sb_statfs(struct dentry *dentry)
1437 return call_int_hook(sb_statfs, dentry);
1441 * security_sb_mount() - Check permission for mounting a filesystem
1442 * @dev_name: filesystem backing device
1443 * @path: mount point
1444 * @type: filesystem type
1445 * @flags: mount flags
1446 * @data: filesystem specific data
1448 * Check permission before an object specified by @dev_name is mounted on the
1449 * mount point named by @nd. For an ordinary mount, @dev_name identifies a
1450 * device if the file system type requires a device. For a remount
1451 * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
1452 * (@flags & MS_BIND), @dev_name identifies the pathname of the object being
1455 * Return: Returns 0 if permission is granted.
1457 int security_sb_mount(const char *dev_name, const struct path *path,
1458 const char *type, unsigned long flags, void *data)
1460 return call_int_hook(sb_mount, dev_name, path, type, flags, data);
1464 * security_sb_umount() - Check permission for unmounting a filesystem
1465 * @mnt: mounted filesystem
1466 * @flags: unmount flags
1468 * Check permission before the @mnt file system is unmounted.
1470 * Return: Returns 0 if permission is granted.
1472 int security_sb_umount(struct vfsmount *mnt, int flags)
1474 return call_int_hook(sb_umount, mnt, flags);
1478 * security_sb_pivotroot() - Check permissions for pivoting the rootfs
1479 * @old_path: new location for current rootfs
1480 * @new_path: location of the new rootfs
1482 * Check permission before pivoting the root filesystem.
1484 * Return: Returns 0 if permission is granted.
1486 int security_sb_pivotroot(const struct path *old_path,
1487 const struct path *new_path)
1489 return call_int_hook(sb_pivotroot, old_path, new_path);
1493 * security_sb_set_mnt_opts() - Set the mount options for a filesystem
1494 * @sb: filesystem superblock
1495 * @mnt_opts: binary mount options
1496 * @kern_flags: kernel flags (in)
1497 * @set_kern_flags: kernel flags (out)
1499 * Set the security relevant mount options used for a superblock.
1501 * Return: Returns 0 on success, error on failure.
1503 int security_sb_set_mnt_opts(struct super_block *sb,
1505 unsigned long kern_flags,
1506 unsigned long *set_kern_flags)
1508 struct security_hook_list *hp;
1509 int rc = mnt_opts ? -EOPNOTSUPP : LSM_RET_DEFAULT(sb_set_mnt_opts);
1511 hlist_for_each_entry(hp, &security_hook_heads.sb_set_mnt_opts,
1513 rc = hp->hook.sb_set_mnt_opts(sb, mnt_opts, kern_flags,
1515 if (rc != LSM_RET_DEFAULT(sb_set_mnt_opts))
1520 EXPORT_SYMBOL(security_sb_set_mnt_opts);
1523 * security_sb_clone_mnt_opts() - Duplicate superblock mount options
1524 * @oldsb: source superblock
1525 * @newsb: destination superblock
1526 * @kern_flags: kernel flags (in)
1527 * @set_kern_flags: kernel flags (out)
1529 * Copy all security options from a given superblock to another.
1531 * Return: Returns 0 on success, error on failure.
1533 int security_sb_clone_mnt_opts(const struct super_block *oldsb,
1534 struct super_block *newsb,
1535 unsigned long kern_flags,
1536 unsigned long *set_kern_flags)
1538 return call_int_hook(sb_clone_mnt_opts, oldsb, newsb,
1539 kern_flags, set_kern_flags);
1541 EXPORT_SYMBOL(security_sb_clone_mnt_opts);
1544 * security_move_mount() - Check permissions for moving a mount
1545 * @from_path: source mount point
1546 * @to_path: destination mount point
1548 * Check permission before a mount is moved.
1550 * Return: Returns 0 if permission is granted.
1552 int security_move_mount(const struct path *from_path,
1553 const struct path *to_path)
1555 return call_int_hook(move_mount, from_path, to_path);
1559 * security_path_notify() - Check if setting a watch is allowed
1562 * @obj_type: file path type
1564 * Check permissions before setting a watch on events as defined by @mask, on
1565 * an object at @path, whose type is defined by @obj_type.
1567 * Return: Returns 0 if permission is granted.
1569 int security_path_notify(const struct path *path, u64 mask,
1570 unsigned int obj_type)
1572 return call_int_hook(path_notify, path, mask, obj_type);
1576 * security_inode_alloc() - Allocate an inode LSM blob
1579 * Allocate and attach a security structure to @inode->i_security. The
1580 * i_security field is initialized to NULL when the inode structure is
1583 * Return: Return 0 if operation was successful.
1585 int security_inode_alloc(struct inode *inode)
1587 int rc = lsm_inode_alloc(inode);
1591 rc = call_int_hook(inode_alloc_security, inode);
1593 security_inode_free(inode);
1597 static void inode_free_by_rcu(struct rcu_head *head)
1600 * The rcu head is at the start of the inode blob
1602 kmem_cache_free(lsm_inode_cache, head);
1606 * security_inode_free() - Free an inode's LSM blob
1609 * Deallocate the inode security structure and set @inode->i_security to NULL.
1611 void security_inode_free(struct inode *inode)
1613 call_void_hook(inode_free_security, inode);
1615 * The inode may still be referenced in a path walk and
1616 * a call to security_inode_permission() can be made
1617 * after inode_free_security() is called. Ideally, the VFS
1618 * wouldn't do this, but fixing that is a much harder
1619 * job. For now, simply free the i_security via RCU, and
1620 * leave the current inode->i_security pointer intact.
1621 * The inode will be freed after the RCU grace period too.
1623 if (inode->i_security)
1624 call_rcu((struct rcu_head *)inode->i_security,
1629 * security_dentry_init_security() - Perform dentry initialization
1630 * @dentry: the dentry to initialize
1631 * @mode: mode used to determine resource type
1632 * @name: name of the last path component
1633 * @xattr_name: name of the security/LSM xattr
1634 * @ctx: pointer to the resulting LSM context
1635 * @ctxlen: length of @ctx
1637 * Compute a context for a dentry as the inode is not yet available since NFSv4
1638 * has no label backed by an EA anyway. It is important to note that
1639 * @xattr_name does not need to be free'd by the caller, it is a static string.
1641 * Return: Returns 0 on success, negative values on failure.
1643 int security_dentry_init_security(struct dentry *dentry, int mode,
1644 const struct qstr *name,
1645 const char **xattr_name, void **ctx,
1648 return call_int_hook(dentry_init_security, dentry, mode, name,
1649 xattr_name, ctx, ctxlen);
1651 EXPORT_SYMBOL(security_dentry_init_security);
1654 * security_dentry_create_files_as() - Perform dentry initialization
1655 * @dentry: the dentry to initialize
1656 * @mode: mode used to determine resource type
1657 * @name: name of the last path component
1658 * @old: creds to use for LSM context calculations
1659 * @new: creds to modify
1661 * Compute a context for a dentry as the inode is not yet available and set
1662 * that context in passed in creds so that new files are created using that
1663 * context. Context is calculated using the passed in creds and not the creds
1666 * Return: Returns 0 on success, error on failure.
1668 int security_dentry_create_files_as(struct dentry *dentry, int mode,
1670 const struct cred *old, struct cred *new)
1672 return call_int_hook(dentry_create_files_as, dentry, mode,
1675 EXPORT_SYMBOL(security_dentry_create_files_as);
1678 * security_inode_init_security() - Initialize an inode's LSM context
1680 * @dir: parent directory
1681 * @qstr: last component of the pathname
1682 * @initxattrs: callback function to write xattrs
1683 * @fs_data: filesystem specific data
1685 * Obtain the security attribute name suffix and value to set on a newly
1686 * created inode and set up the incore security field for the new inode. This
1687 * hook is called by the fs code as part of the inode creation transaction and
1688 * provides for atomic labeling of the inode, unlike the post_create/mkdir/...
1689 * hooks called by the VFS.
1691 * The hook function is expected to populate the xattrs array, by calling
1692 * lsm_get_xattr_slot() to retrieve the slots reserved by the security module
1693 * with the lbs_xattr_count field of the lsm_blob_sizes structure. For each
1694 * slot, the hook function should set ->name to the attribute name suffix
1695 * (e.g. selinux), to allocate ->value (will be freed by the caller) and set it
1696 * to the attribute value, to set ->value_len to the length of the value. If
1697 * the security module does not use security attributes or does not wish to put
1698 * a security attribute on this particular inode, then it should return
1699 * -EOPNOTSUPP to skip this processing.
1701 * Return: Returns 0 if the LSM successfully initialized all of the inode
1702 * security attributes that are required, negative values otherwise.
1704 int security_inode_init_security(struct inode *inode, struct inode *dir,
1705 const struct qstr *qstr,
1706 const initxattrs initxattrs, void *fs_data)
1708 struct security_hook_list *hp;
1709 struct xattr *new_xattrs = NULL;
1710 int ret = -EOPNOTSUPP, xattr_count = 0;
1712 if (unlikely(IS_PRIVATE(inode)))
1715 if (!blob_sizes.lbs_xattr_count)
1719 /* Allocate +1 as terminator. */
1720 new_xattrs = kcalloc(blob_sizes.lbs_xattr_count + 1,
1721 sizeof(*new_xattrs), GFP_NOFS);
1726 hlist_for_each_entry(hp, &security_hook_heads.inode_init_security,
1728 ret = hp->hook.inode_init_security(inode, dir, qstr, new_xattrs,
1730 if (ret && ret != -EOPNOTSUPP)
1733 * As documented in lsm_hooks.h, -EOPNOTSUPP in this context
1734 * means that the LSM is not willing to provide an xattr, not
1735 * that it wants to signal an error. Thus, continue to invoke
1736 * the remaining LSMs.
1740 /* If initxattrs() is NULL, xattr_count is zero, skip the call. */
1744 ret = initxattrs(inode, new_xattrs, fs_data);
1746 for (; xattr_count > 0; xattr_count--)
1747 kfree(new_xattrs[xattr_count - 1].value);
1749 return (ret == -EOPNOTSUPP) ? 0 : ret;
1751 EXPORT_SYMBOL(security_inode_init_security);
1754 * security_inode_init_security_anon() - Initialize an anonymous inode
1756 * @name: the anonymous inode class
1757 * @context_inode: an optional related inode
1759 * Set up the incore security field for the new anonymous inode and return
1760 * whether the inode creation is permitted by the security module or not.
1762 * Return: Returns 0 on success, -EACCES if the security module denies the
1763 * creation of this inode, or another -errno upon other errors.
1765 int security_inode_init_security_anon(struct inode *inode,
1766 const struct qstr *name,
1767 const struct inode *context_inode)
1769 return call_int_hook(inode_init_security_anon, inode, name,
1773 #ifdef CONFIG_SECURITY_PATH
1775 * security_path_mknod() - Check if creating a special file is allowed
1776 * @dir: parent directory
1778 * @mode: new file mode
1779 * @dev: device number
1781 * Check permissions when creating a file. Note that this hook is called even
1782 * if mknod operation is being done for a regular file.
1784 * Return: Returns 0 if permission is granted.
1786 int security_path_mknod(const struct path *dir, struct dentry *dentry,
1787 umode_t mode, unsigned int dev)
1789 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1791 return call_int_hook(path_mknod, dir, dentry, mode, dev);
1793 EXPORT_SYMBOL(security_path_mknod);
1796 * security_path_post_mknod() - Update inode security after reg file creation
1797 * @idmap: idmap of the mount
1800 * Update inode security field after a regular file has been created.
1802 void security_path_post_mknod(struct mnt_idmap *idmap, struct dentry *dentry)
1804 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
1806 call_void_hook(path_post_mknod, idmap, dentry);
1810 * security_path_mkdir() - Check if creating a new directory is allowed
1811 * @dir: parent directory
1812 * @dentry: new directory
1813 * @mode: new directory mode
1815 * Check permissions to create a new directory in the existing directory.
1817 * Return: Returns 0 if permission is granted.
1819 int security_path_mkdir(const struct path *dir, struct dentry *dentry,
1822 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1824 return call_int_hook(path_mkdir, dir, dentry, mode);
1826 EXPORT_SYMBOL(security_path_mkdir);
1829 * security_path_rmdir() - Check if removing a directory is allowed
1830 * @dir: parent directory
1831 * @dentry: directory to remove
1833 * Check the permission to remove a directory.
1835 * Return: Returns 0 if permission is granted.
1837 int security_path_rmdir(const struct path *dir, struct dentry *dentry)
1839 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1841 return call_int_hook(path_rmdir, dir, dentry);
1845 * security_path_unlink() - Check if removing a hard link is allowed
1846 * @dir: parent directory
1849 * Check the permission to remove a hard link to a file.
1851 * Return: Returns 0 if permission is granted.
1853 int security_path_unlink(const struct path *dir, struct dentry *dentry)
1855 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1857 return call_int_hook(path_unlink, dir, dentry);
1859 EXPORT_SYMBOL(security_path_unlink);
1862 * security_path_symlink() - Check if creating a symbolic link is allowed
1863 * @dir: parent directory
1864 * @dentry: symbolic link
1865 * @old_name: file pathname
1867 * Check the permission to create a symbolic link to a file.
1869 * Return: Returns 0 if permission is granted.
1871 int security_path_symlink(const struct path *dir, struct dentry *dentry,
1872 const char *old_name)
1874 if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
1876 return call_int_hook(path_symlink, dir, dentry, old_name);
1880 * security_path_link - Check if creating a hard link is allowed
1881 * @old_dentry: existing file
1882 * @new_dir: new parent directory
1883 * @new_dentry: new link
1885 * Check permission before creating a new hard link to a file.
1887 * Return: Returns 0 if permission is granted.
1889 int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
1890 struct dentry *new_dentry)
1892 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
1894 return call_int_hook(path_link, old_dentry, new_dir, new_dentry);
1898 * security_path_rename() - Check if renaming a file is allowed
1899 * @old_dir: parent directory of the old file
1900 * @old_dentry: the old file
1901 * @new_dir: parent directory of the new file
1902 * @new_dentry: the new file
1905 * Check for permission to rename a file or directory.
1907 * Return: Returns 0 if permission is granted.
1909 int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
1910 const struct path *new_dir, struct dentry *new_dentry,
1913 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
1914 (d_is_positive(new_dentry) &&
1915 IS_PRIVATE(d_backing_inode(new_dentry)))))
1918 return call_int_hook(path_rename, old_dir, old_dentry, new_dir,
1921 EXPORT_SYMBOL(security_path_rename);
1924 * security_path_truncate() - Check if truncating a file is allowed
1927 * Check permission before truncating the file indicated by path. Note that
1928 * truncation permissions may also be checked based on already opened files,
1929 * using the security_file_truncate() hook.
1931 * Return: Returns 0 if permission is granted.
1933 int security_path_truncate(const struct path *path)
1935 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1937 return call_int_hook(path_truncate, path);
1941 * security_path_chmod() - Check if changing the file's mode is allowed
1945 * Check for permission to change a mode of the file @path. The new mode is
1946 * specified in @mode which is a bitmask of constants from
1947 * <include/uapi/linux/stat.h>.
1949 * Return: Returns 0 if permission is granted.
1951 int security_path_chmod(const struct path *path, umode_t mode)
1953 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1955 return call_int_hook(path_chmod, path, mode);
1959 * security_path_chown() - Check if changing the file's owner/group is allowed
1964 * Check for permission to change owner/group of a file or directory.
1966 * Return: Returns 0 if permission is granted.
1968 int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
1970 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
1972 return call_int_hook(path_chown, path, uid, gid);
1976 * security_path_chroot() - Check if changing the root directory is allowed
1979 * Check for permission to change root directory.
1981 * Return: Returns 0 if permission is granted.
1983 int security_path_chroot(const struct path *path)
1985 return call_int_hook(path_chroot, path);
1987 #endif /* CONFIG_SECURITY_PATH */
1990 * security_inode_create() - Check if creating a file is allowed
1991 * @dir: the parent directory
1992 * @dentry: the file being created
1993 * @mode: requested file mode
1995 * Check permission to create a regular file.
1997 * Return: Returns 0 if permission is granted.
1999 int security_inode_create(struct inode *dir, struct dentry *dentry,
2002 if (unlikely(IS_PRIVATE(dir)))
2004 return call_int_hook(inode_create, dir, dentry, mode);
2006 EXPORT_SYMBOL_GPL(security_inode_create);
2009 * security_inode_post_create_tmpfile() - Update inode security of new tmpfile
2010 * @idmap: idmap of the mount
2011 * @inode: inode of the new tmpfile
2013 * Update inode security data after a tmpfile has been created.
2015 void security_inode_post_create_tmpfile(struct mnt_idmap *idmap,
2016 struct inode *inode)
2018 if (unlikely(IS_PRIVATE(inode)))
2020 call_void_hook(inode_post_create_tmpfile, idmap, inode);
2024 * security_inode_link() - Check if creating a hard link is allowed
2025 * @old_dentry: existing file
2026 * @dir: new parent directory
2027 * @new_dentry: new link
2029 * Check permission before creating a new hard link to a file.
2031 * Return: Returns 0 if permission is granted.
2033 int security_inode_link(struct dentry *old_dentry, struct inode *dir,
2034 struct dentry *new_dentry)
2036 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
2038 return call_int_hook(inode_link, old_dentry, dir, new_dentry);
2042 * security_inode_unlink() - Check if removing a hard link is allowed
2043 * @dir: parent directory
2046 * Check the permission to remove a hard link to a file.
2048 * Return: Returns 0 if permission is granted.
2050 int security_inode_unlink(struct inode *dir, struct dentry *dentry)
2052 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2054 return call_int_hook(inode_unlink, dir, dentry);
2058 * security_inode_symlink() - Check if creating a symbolic link is allowed
2059 * @dir: parent directory
2060 * @dentry: symbolic link
2061 * @old_name: existing filename
2063 * Check the permission to create a symbolic link to a file.
2065 * Return: Returns 0 if permission is granted.
2067 int security_inode_symlink(struct inode *dir, struct dentry *dentry,
2068 const char *old_name)
2070 if (unlikely(IS_PRIVATE(dir)))
2072 return call_int_hook(inode_symlink, dir, dentry, old_name);
2076 * security_inode_mkdir() - Check if creation a new director is allowed
2077 * @dir: parent directory
2078 * @dentry: new directory
2079 * @mode: new directory mode
2081 * Check permissions to create a new directory in the existing directory
2082 * associated with inode structure @dir.
2084 * Return: Returns 0 if permission is granted.
2086 int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
2088 if (unlikely(IS_PRIVATE(dir)))
2090 return call_int_hook(inode_mkdir, dir, dentry, mode);
2092 EXPORT_SYMBOL_GPL(security_inode_mkdir);
2095 * security_inode_rmdir() - Check if removing a directory is allowed
2096 * @dir: parent directory
2097 * @dentry: directory to be removed
2099 * Check the permission to remove a directory.
2101 * Return: Returns 0 if permission is granted.
2103 int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
2105 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2107 return call_int_hook(inode_rmdir, dir, dentry);
2111 * security_inode_mknod() - Check if creating a special file is allowed
2112 * @dir: parent directory
2114 * @mode: new file mode
2115 * @dev: device number
2117 * Check permissions when creating a special file (or a socket or a fifo file
2118 * created via the mknod system call). Note that if mknod operation is being
2119 * done for a regular file, then the create hook will be called and not this
2122 * Return: Returns 0 if permission is granted.
2124 int security_inode_mknod(struct inode *dir, struct dentry *dentry,
2125 umode_t mode, dev_t dev)
2127 if (unlikely(IS_PRIVATE(dir)))
2129 return call_int_hook(inode_mknod, dir, dentry, mode, dev);
2133 * security_inode_rename() - Check if renaming a file is allowed
2134 * @old_dir: parent directory of the old file
2135 * @old_dentry: the old file
2136 * @new_dir: parent directory of the new file
2137 * @new_dentry: the new file
2140 * Check for permission to rename a file or directory.
2142 * Return: Returns 0 if permission is granted.
2144 int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
2145 struct inode *new_dir, struct dentry *new_dentry,
2148 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
2149 (d_is_positive(new_dentry) &&
2150 IS_PRIVATE(d_backing_inode(new_dentry)))))
2153 if (flags & RENAME_EXCHANGE) {
2154 int err = call_int_hook(inode_rename, new_dir, new_dentry,
2155 old_dir, old_dentry);
2160 return call_int_hook(inode_rename, old_dir, old_dentry,
2161 new_dir, new_dentry);
2165 * security_inode_readlink() - Check if reading a symbolic link is allowed
2168 * Check the permission to read the symbolic link.
2170 * Return: Returns 0 if permission is granted.
2172 int security_inode_readlink(struct dentry *dentry)
2174 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2176 return call_int_hook(inode_readlink, dentry);
2180 * security_inode_follow_link() - Check if following a symbolic link is allowed
2181 * @dentry: link dentry
2182 * @inode: link inode
2183 * @rcu: true if in RCU-walk mode
2185 * Check permission to follow a symbolic link when looking up a pathname. If
2186 * @rcu is true, @inode is not stable.
2188 * Return: Returns 0 if permission is granted.
2190 int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
2193 if (unlikely(IS_PRIVATE(inode)))
2195 return call_int_hook(inode_follow_link, dentry, inode, rcu);
2199 * security_inode_permission() - Check if accessing an inode is allowed
2201 * @mask: access mask
2203 * Check permission before accessing an inode. This hook is called by the
2204 * existing Linux permission function, so a security module can use it to
2205 * provide additional checking for existing Linux permission checks. Notice
2206 * that this hook is called when a file is opened (as well as many other
2207 * operations), whereas the file_security_ops permission hook is called when
2208 * the actual read/write operations are performed.
2210 * Return: Returns 0 if permission is granted.
2212 int security_inode_permission(struct inode *inode, int mask)
2214 if (unlikely(IS_PRIVATE(inode)))
2216 return call_int_hook(inode_permission, inode, mask);
2220 * security_inode_setattr() - Check if setting file attributes is allowed
2221 * @idmap: idmap of the mount
2223 * @attr: new attributes
2225 * Check permission before setting file attributes. Note that the kernel call
2226 * to notify_change is performed from several locations, whenever file
2227 * attributes change (such as when a file is truncated, chown/chmod operations,
2228 * transferring disk quotas, etc).
2230 * Return: Returns 0 if permission is granted.
2232 int security_inode_setattr(struct mnt_idmap *idmap,
2233 struct dentry *dentry, struct iattr *attr)
2235 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2237 return call_int_hook(inode_setattr, idmap, dentry, attr);
2239 EXPORT_SYMBOL_GPL(security_inode_setattr);
2242 * security_inode_post_setattr() - Update the inode after a setattr operation
2243 * @idmap: idmap of the mount
2245 * @ia_valid: file attributes set
2247 * Update inode security field after successful setting file attributes.
2249 void security_inode_post_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
2252 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2254 call_void_hook(inode_post_setattr, idmap, dentry, ia_valid);
2258 * security_inode_getattr() - Check if getting file attributes is allowed
2261 * Check permission before obtaining file attributes.
2263 * Return: Returns 0 if permission is granted.
2265 int security_inode_getattr(const struct path *path)
2267 if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
2269 return call_int_hook(inode_getattr, path);
2273 * security_inode_setxattr() - Check if setting file xattrs is allowed
2274 * @idmap: idmap of the mount
2277 * @value: xattr value
2278 * @size: size of xattr value
2281 * Check permission before setting the extended attributes.
2283 * Return: Returns 0 if permission is granted.
2285 int security_inode_setxattr(struct mnt_idmap *idmap,
2286 struct dentry *dentry, const char *name,
2287 const void *value, size_t size, int flags)
2291 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2294 * SELinux and Smack integrate the cap call,
2295 * so assume that all LSMs supplying this call do so.
2297 ret = call_int_hook(inode_setxattr, idmap, dentry, name, value, size,
2301 ret = cap_inode_setxattr(dentry, name, value, size, flags);
2306 * security_inode_set_acl() - Check if setting posix acls is allowed
2307 * @idmap: idmap of the mount
2309 * @acl_name: acl name
2312 * Check permission before setting posix acls, the posix acls in @kacl are
2313 * identified by @acl_name.
2315 * Return: Returns 0 if permission is granted.
2317 int security_inode_set_acl(struct mnt_idmap *idmap,
2318 struct dentry *dentry, const char *acl_name,
2319 struct posix_acl *kacl)
2321 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2323 return call_int_hook(inode_set_acl, idmap, dentry, acl_name, kacl);
2327 * security_inode_post_set_acl() - Update inode security from posix acls set
2329 * @acl_name: acl name
2332 * Update inode security data after successfully setting posix acls on @dentry.
2333 * The posix acls in @kacl are identified by @acl_name.
2335 void security_inode_post_set_acl(struct dentry *dentry, const char *acl_name,
2336 struct posix_acl *kacl)
2338 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2340 call_void_hook(inode_post_set_acl, dentry, acl_name, kacl);
2344 * security_inode_get_acl() - Check if reading posix acls is allowed
2345 * @idmap: idmap of the mount
2347 * @acl_name: acl name
2349 * Check permission before getting osix acls, the posix acls are identified by
2352 * Return: Returns 0 if permission is granted.
2354 int security_inode_get_acl(struct mnt_idmap *idmap,
2355 struct dentry *dentry, const char *acl_name)
2357 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2359 return call_int_hook(inode_get_acl, idmap, dentry, acl_name);
2363 * security_inode_remove_acl() - Check if removing a posix acl is allowed
2364 * @idmap: idmap of the mount
2366 * @acl_name: acl name
2368 * Check permission before removing posix acls, the posix acls are identified
2371 * Return: Returns 0 if permission is granted.
2373 int security_inode_remove_acl(struct mnt_idmap *idmap,
2374 struct dentry *dentry, const char *acl_name)
2376 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2378 return call_int_hook(inode_remove_acl, idmap, dentry, acl_name);
2382 * security_inode_post_remove_acl() - Update inode security after rm posix acls
2383 * @idmap: idmap of the mount
2385 * @acl_name: acl name
2387 * Update inode security data after successfully removing posix acls on
2388 * @dentry in @idmap. The posix acls are identified by @acl_name.
2390 void security_inode_post_remove_acl(struct mnt_idmap *idmap,
2391 struct dentry *dentry, const char *acl_name)
2393 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2395 call_void_hook(inode_post_remove_acl, idmap, dentry, acl_name);
2399 * security_inode_post_setxattr() - Update the inode after a setxattr operation
2402 * @value: xattr value
2403 * @size: xattr value size
2406 * Update inode security field after successful setxattr operation.
2408 void security_inode_post_setxattr(struct dentry *dentry, const char *name,
2409 const void *value, size_t size, int flags)
2411 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2413 call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
2417 * security_inode_getxattr() - Check if xattr access is allowed
2421 * Check permission before obtaining the extended attributes identified by
2422 * @name for @dentry.
2424 * Return: Returns 0 if permission is granted.
2426 int security_inode_getxattr(struct dentry *dentry, const char *name)
2428 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2430 return call_int_hook(inode_getxattr, dentry, name);
2434 * security_inode_listxattr() - Check if listing xattrs is allowed
2437 * Check permission before obtaining the list of extended attribute names for
2440 * Return: Returns 0 if permission is granted.
2442 int security_inode_listxattr(struct dentry *dentry)
2444 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2446 return call_int_hook(inode_listxattr, dentry);
2450 * security_inode_removexattr() - Check if removing an xattr is allowed
2451 * @idmap: idmap of the mount
2455 * Check permission before removing the extended attribute identified by @name
2458 * Return: Returns 0 if permission is granted.
2460 int security_inode_removexattr(struct mnt_idmap *idmap,
2461 struct dentry *dentry, const char *name)
2465 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2468 * SELinux and Smack integrate the cap call,
2469 * so assume that all LSMs supplying this call do so.
2471 ret = call_int_hook(inode_removexattr, idmap, dentry, name);
2473 ret = cap_inode_removexattr(idmap, dentry, name);
2478 * security_inode_post_removexattr() - Update the inode after a removexattr op
2482 * Update the inode after a successful removexattr operation.
2484 void security_inode_post_removexattr(struct dentry *dentry, const char *name)
2486 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2488 call_void_hook(inode_post_removexattr, dentry, name);
2492 * security_inode_need_killpriv() - Check if security_inode_killpriv() required
2493 * @dentry: associated dentry
2495 * Called when an inode has been changed to determine if
2496 * security_inode_killpriv() should be called.
2498 * Return: Return <0 on error to abort the inode change operation, return 0 if
2499 * security_inode_killpriv() does not need to be called, return >0 if
2500 * security_inode_killpriv() does need to be called.
2502 int security_inode_need_killpriv(struct dentry *dentry)
2504 return call_int_hook(inode_need_killpriv, dentry);
2508 * security_inode_killpriv() - The setuid bit is removed, update LSM state
2509 * @idmap: idmap of the mount
2510 * @dentry: associated dentry
2512 * The @dentry's setuid bit is being removed. Remove similar security labels.
2513 * Called with the dentry->d_inode->i_mutex held.
2515 * Return: Return 0 on success. If error is returned, then the operation
2516 * causing setuid bit removal is failed.
2518 int security_inode_killpriv(struct mnt_idmap *idmap,
2519 struct dentry *dentry)
2521 return call_int_hook(inode_killpriv, idmap, dentry);
2525 * security_inode_getsecurity() - Get the xattr security label of an inode
2526 * @idmap: idmap of the mount
2529 * @buffer: security label buffer
2530 * @alloc: allocation flag
2532 * Retrieve a copy of the extended attribute representation of the security
2533 * label associated with @name for @inode via @buffer. Note that @name is the
2534 * remainder of the attribute name after the security prefix has been removed.
2535 * @alloc is used to specify if the call should return a value via the buffer
2536 * or just the value length.
2538 * Return: Returns size of buffer on success.
2540 int security_inode_getsecurity(struct mnt_idmap *idmap,
2541 struct inode *inode, const char *name,
2542 void **buffer, bool alloc)
2544 if (unlikely(IS_PRIVATE(inode)))
2545 return LSM_RET_DEFAULT(inode_getsecurity);
2547 return call_int_hook(inode_getsecurity, idmap, inode, name, buffer,
2552 * security_inode_setsecurity() - Set the xattr security label of an inode
2555 * @value: security label
2556 * @size: length of security label
2559 * Set the security label associated with @name for @inode from the extended
2560 * attribute value @value. @size indicates the size of the @value in bytes.
2561 * @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
2562 * remainder of the attribute name after the security. prefix has been removed.
2564 * Return: Returns 0 on success.
2566 int security_inode_setsecurity(struct inode *inode, const char *name,
2567 const void *value, size_t size, int flags)
2569 if (unlikely(IS_PRIVATE(inode)))
2570 return LSM_RET_DEFAULT(inode_setsecurity);
2572 return call_int_hook(inode_setsecurity, inode, name, value, size,
2577 * security_inode_listsecurity() - List the xattr security label names
2580 * @buffer_size: size of buffer
2582 * Copy the extended attribute names for the security labels associated with
2583 * @inode into @buffer. The maximum size of @buffer is specified by
2584 * @buffer_size. @buffer may be NULL to request the size of the buffer
2587 * Return: Returns number of bytes used/required on success.
2589 int security_inode_listsecurity(struct inode *inode,
2590 char *buffer, size_t buffer_size)
2592 if (unlikely(IS_PRIVATE(inode)))
2594 return call_int_hook(inode_listsecurity, inode, buffer, buffer_size);
2596 EXPORT_SYMBOL(security_inode_listsecurity);
2599 * security_inode_getsecid() - Get an inode's secid
2601 * @secid: secid to return
2603 * Get the secid associated with the node. In case of failure, @secid will be
2606 void security_inode_getsecid(struct inode *inode, u32 *secid)
2608 call_void_hook(inode_getsecid, inode, secid);
2612 * security_inode_copy_up() - Create new creds for an overlayfs copy-up op
2613 * @src: union dentry of copy-up file
2614 * @new: newly created creds
2616 * A file is about to be copied up from lower layer to upper layer of overlay
2617 * filesystem. Security module can prepare a set of new creds and modify as
2618 * need be and return new creds. Caller will switch to new creds temporarily to
2619 * create new file and release newly allocated creds.
2621 * Return: Returns 0 on success or a negative error code on error.
2623 int security_inode_copy_up(struct dentry *src, struct cred **new)
2625 return call_int_hook(inode_copy_up, src, new);
2627 EXPORT_SYMBOL(security_inode_copy_up);
2630 * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
2633 * Filter the xattrs being copied up when a unioned file is copied up from a
2634 * lower layer to the union/overlay layer. The caller is responsible for
2635 * reading and writing the xattrs, this hook is merely a filter.
2637 * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
2638 * if the security module does not know about attribute, or a negative
2639 * error code to abort the copy up.
2641 int security_inode_copy_up_xattr(const char *name)
2646 * The implementation can return 0 (accept the xattr), 1 (discard the
2647 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
2648 * any other error code in case of an error.
2650 rc = call_int_hook(inode_copy_up_xattr, name);
2651 if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
2654 return LSM_RET_DEFAULT(inode_copy_up_xattr);
2656 EXPORT_SYMBOL(security_inode_copy_up_xattr);
2659 * security_kernfs_init_security() - Init LSM context for a kernfs node
2660 * @kn_dir: parent kernfs node
2661 * @kn: the kernfs node to initialize
2663 * Initialize the security context of a newly created kernfs node based on its
2664 * own and its parent's attributes.
2666 * Return: Returns 0 if permission is granted.
2668 int security_kernfs_init_security(struct kernfs_node *kn_dir,
2669 struct kernfs_node *kn)
2671 return call_int_hook(kernfs_init_security, kn_dir, kn);
2675 * security_file_permission() - Check file permissions
2677 * @mask: requested permissions
2679 * Check file permissions before accessing an open file. This hook is called
2680 * by various operations that read or write files. A security module can use
2681 * this hook to perform additional checking on these operations, e.g. to
2682 * revalidate permissions on use to support privilege bracketing or policy
2683 * changes. Notice that this hook is used when the actual read/write
2684 * operations are performed, whereas the inode_security_ops hook is called when
2685 * a file is opened (as well as many other operations). Although this hook can
2686 * be used to revalidate permissions for various system call operations that
2687 * read or write files, it does not address the revalidation of permissions for
2688 * memory-mapped files. Security modules must handle this separately if they
2689 * need such revalidation.
2691 * Return: Returns 0 if permission is granted.
2693 int security_file_permission(struct file *file, int mask)
2695 return call_int_hook(file_permission, file, mask);
2699 * security_file_alloc() - Allocate and init a file's LSM blob
2702 * Allocate and attach a security structure to the file->f_security field. The
2703 * security field is initialized to NULL when the structure is first created.
2705 * Return: Return 0 if the hook is successful and permission is granted.
2707 int security_file_alloc(struct file *file)
2709 int rc = lsm_file_alloc(file);
2713 rc = call_int_hook(file_alloc_security, file);
2715 security_file_free(file);
2720 * security_file_release() - Perform actions before releasing the file ref
2723 * Perform actions before releasing the last reference to a file.
2725 void security_file_release(struct file *file)
2727 call_void_hook(file_release, file);
2731 * security_file_free() - Free a file's LSM blob
2734 * Deallocate and free any security structures stored in file->f_security.
2736 void security_file_free(struct file *file)
2740 call_void_hook(file_free_security, file);
2742 blob = file->f_security;
2744 file->f_security = NULL;
2745 kmem_cache_free(lsm_file_cache, blob);
2750 * security_file_ioctl() - Check if an ioctl is allowed
2751 * @file: associated file
2753 * @arg: ioctl arguments
2755 * Check permission for an ioctl operation on @file. Note that @arg sometimes
2756 * represents a user space pointer; in other cases, it may be a simple integer
2757 * value. When @arg represents a user space pointer, it should never be used
2758 * by the security module.
2760 * Return: Returns 0 if permission is granted.
2762 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2764 return call_int_hook(file_ioctl, file, cmd, arg);
2766 EXPORT_SYMBOL_GPL(security_file_ioctl);
2769 * security_file_ioctl_compat() - Check if an ioctl is allowed in compat mode
2770 * @file: associated file
2772 * @arg: ioctl arguments
2774 * Compat version of security_file_ioctl() that correctly handles 32-bit
2775 * processes running on 64-bit kernels.
2777 * Return: Returns 0 if permission is granted.
2779 int security_file_ioctl_compat(struct file *file, unsigned int cmd,
2782 return call_int_hook(file_ioctl_compat, file, cmd, arg);
2784 EXPORT_SYMBOL_GPL(security_file_ioctl_compat);
2786 static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
2789 * Does we have PROT_READ and does the application expect
2790 * it to imply PROT_EXEC? If not, nothing to talk about...
2792 if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
2794 if (!(current->personality & READ_IMPLIES_EXEC))
2797 * if that's an anonymous mapping, let it.
2800 return prot | PROT_EXEC;
2802 * ditto if it's not on noexec mount, except that on !MMU we need
2803 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
2805 if (!path_noexec(&file->f_path)) {
2807 if (file->f_op->mmap_capabilities) {
2808 unsigned caps = file->f_op->mmap_capabilities(file);
2809 if (!(caps & NOMMU_MAP_EXEC))
2813 return prot | PROT_EXEC;
2815 /* anything on noexec mount won't get PROT_EXEC */
2820 * security_mmap_file() - Check if mmap'ing a file is allowed
2822 * @prot: protection applied by the kernel
2825 * Check permissions for a mmap operation. The @file may be NULL, e.g. if
2826 * mapping anonymous memory.
2828 * Return: Returns 0 if permission is granted.
2830 int security_mmap_file(struct file *file, unsigned long prot,
2831 unsigned long flags)
2833 return call_int_hook(mmap_file, file, prot, mmap_prot(file, prot),
2838 * security_mmap_addr() - Check if mmap'ing an address is allowed
2841 * Check permissions for a mmap operation at @addr.
2843 * Return: Returns 0 if permission is granted.
2845 int security_mmap_addr(unsigned long addr)
2847 return call_int_hook(mmap_addr, addr);
2851 * security_file_mprotect() - Check if changing memory protections is allowed
2852 * @vma: memory region
2853 * @reqprot: application requested protection
2854 * @prot: protection applied by the kernel
2856 * Check permissions before changing memory access permissions.
2858 * Return: Returns 0 if permission is granted.
2860 int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
2863 return call_int_hook(file_mprotect, vma, reqprot, prot);
2867 * security_file_lock() - Check if a file lock is allowed
2869 * @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
2871 * Check permission before performing file locking operations. Note the hook
2872 * mediates both flock and fcntl style locks.
2874 * Return: Returns 0 if permission is granted.
2876 int security_file_lock(struct file *file, unsigned int cmd)
2878 return call_int_hook(file_lock, file, cmd);
2882 * security_file_fcntl() - Check if fcntl() op is allowed
2884 * @cmd: fcntl command
2885 * @arg: command argument
2887 * Check permission before allowing the file operation specified by @cmd from
2888 * being performed on the file @file. Note that @arg sometimes represents a
2889 * user space pointer; in other cases, it may be a simple integer value. When
2890 * @arg represents a user space pointer, it should never be used by the
2893 * Return: Returns 0 if permission is granted.
2895 int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
2897 return call_int_hook(file_fcntl, file, cmd, arg);
2901 * security_file_set_fowner() - Set the file owner info in the LSM blob
2904 * Save owner security information (typically from current->security) in
2905 * file->f_security for later use by the send_sigiotask hook.
2907 * Return: Returns 0 on success.
2909 void security_file_set_fowner(struct file *file)
2911 call_void_hook(file_set_fowner, file);
2915 * security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
2917 * @fown: signal sender
2918 * @sig: signal to be sent, SIGIO is sent if 0
2920 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
2921 * process @tsk. Note that this hook is sometimes called from interrupt. Note
2922 * that the fown_struct, @fown, is never outside the context of a struct file,
2923 * so the file structure (and associated security information) can always be
2924 * obtained: container_of(fown, struct file, f_owner).
2926 * Return: Returns 0 if permission is granted.
2928 int security_file_send_sigiotask(struct task_struct *tsk,
2929 struct fown_struct *fown, int sig)
2931 return call_int_hook(file_send_sigiotask, tsk, fown, sig);
2935 * security_file_receive() - Check if receiving a file via IPC is allowed
2936 * @file: file being received
2938 * This hook allows security modules to control the ability of a process to
2939 * receive an open file descriptor via socket IPC.
2941 * Return: Returns 0 if permission is granted.
2943 int security_file_receive(struct file *file)
2945 return call_int_hook(file_receive, file);
2949 * security_file_open() - Save open() time state for late use by the LSM
2952 * Save open-time permission checking state for later use upon file_permission,
2953 * and recheck access if anything has changed since inode_permission.
2955 * Return: Returns 0 if permission is granted.
2957 int security_file_open(struct file *file)
2961 ret = call_int_hook(file_open, file);
2965 return fsnotify_open_perm(file);
2969 * security_file_post_open() - Evaluate a file after it has been opened
2971 * @mask: access mask
2973 * Evaluate an opened file and the access mask requested with open(). The hook
2974 * is useful for LSMs that require the file content to be available in order to
2977 * Return: Returns 0 if permission is granted.
2979 int security_file_post_open(struct file *file, int mask)
2981 return call_int_hook(file_post_open, file, mask);
2983 EXPORT_SYMBOL_GPL(security_file_post_open);
2986 * security_file_truncate() - Check if truncating a file is allowed
2989 * Check permission before truncating a file, i.e. using ftruncate. Note that
2990 * truncation permission may also be checked based on the path, using the
2991 * @path_truncate hook.
2993 * Return: Returns 0 if permission is granted.
2995 int security_file_truncate(struct file *file)
2997 return call_int_hook(file_truncate, file);
3001 * security_task_alloc() - Allocate a task's LSM blob
3003 * @clone_flags: flags indicating what is being shared
3005 * Handle allocation of task-related resources.
3007 * Return: Returns a zero on success, negative values on failure.
3009 int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
3011 int rc = lsm_task_alloc(task);
3015 rc = call_int_hook(task_alloc, task, clone_flags);
3017 security_task_free(task);
3022 * security_task_free() - Free a task's LSM blob and related resources
3025 * Handle release of task-related resources. Note that this can be called from
3026 * interrupt context.
3028 void security_task_free(struct task_struct *task)
3030 call_void_hook(task_free, task);
3032 kfree(task->security);
3033 task->security = NULL;
3037 * security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
3038 * @cred: credentials
3041 * Only allocate sufficient memory and attach to @cred such that
3042 * cred_transfer() will not get ENOMEM.
3044 * Return: Returns 0 on success, negative values on failure.
3046 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
3048 int rc = lsm_cred_alloc(cred, gfp);
3053 rc = call_int_hook(cred_alloc_blank, cred, gfp);
3055 security_cred_free(cred);
3060 * security_cred_free() - Free the cred's LSM blob and associated resources
3061 * @cred: credentials
3063 * Deallocate and clear the cred->security field in a set of credentials.
3065 void security_cred_free(struct cred *cred)
3068 * There is a failure case in prepare_creds() that
3069 * may result in a call here with ->security being NULL.
3071 if (unlikely(cred->security == NULL))
3074 call_void_hook(cred_free, cred);
3076 kfree(cred->security);
3077 cred->security = NULL;
3081 * security_prepare_creds() - Prepare a new set of credentials
3082 * @new: new credentials
3083 * @old: original credentials
3086 * Prepare a new set of credentials by copying the data from the old set.
3088 * Return: Returns 0 on success, negative values on failure.
3090 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
3092 int rc = lsm_cred_alloc(new, gfp);
3097 rc = call_int_hook(cred_prepare, new, old, gfp);
3099 security_cred_free(new);
3104 * security_transfer_creds() - Transfer creds
3105 * @new: target credentials
3106 * @old: original credentials
3108 * Transfer data from original creds to new creds.
3110 void security_transfer_creds(struct cred *new, const struct cred *old)
3112 call_void_hook(cred_transfer, new, old);
3116 * security_cred_getsecid() - Get the secid from a set of credentials
3118 * @secid: secid value
3120 * Retrieve the security identifier of the cred structure @c. In case of
3121 * failure, @secid will be set to zero.
3123 void security_cred_getsecid(const struct cred *c, u32 *secid)
3126 call_void_hook(cred_getsecid, c, secid);
3128 EXPORT_SYMBOL(security_cred_getsecid);
3131 * security_kernel_act_as() - Set the kernel credentials to act as secid
3135 * Set the credentials for a kernel service to act as (subjective context).
3136 * The current task must be the one that nominated @secid.
3138 * Return: Returns 0 if successful.
3140 int security_kernel_act_as(struct cred *new, u32 secid)
3142 return call_int_hook(kernel_act_as, new, secid);
3146 * security_kernel_create_files_as() - Set file creation context using an inode
3147 * @new: target credentials
3148 * @inode: reference inode
3150 * Set the file creation context in a set of credentials to be the same as the
3151 * objective context of the specified inode. The current task must be the one
3152 * that nominated @inode.
3154 * Return: Returns 0 if successful.
3156 int security_kernel_create_files_as(struct cred *new, struct inode *inode)
3158 return call_int_hook(kernel_create_files_as, new, inode);
3162 * security_kernel_module_request() - Check if loading a module is allowed
3163 * @kmod_name: module name
3165 * Ability to trigger the kernel to automatically upcall to userspace for
3166 * userspace to load a kernel module with the given name.
3168 * Return: Returns 0 if successful.
3170 int security_kernel_module_request(char *kmod_name)
3172 return call_int_hook(kernel_module_request, kmod_name);
3176 * security_kernel_read_file() - Read a file specified by userspace
3178 * @id: file identifier
3179 * @contents: trust if security_kernel_post_read_file() will be called
3181 * Read a file specified by userspace.
3183 * Return: Returns 0 if permission is granted.
3185 int security_kernel_read_file(struct file *file, enum kernel_read_file_id id,
3188 return call_int_hook(kernel_read_file, file, id, contents);
3190 EXPORT_SYMBOL_GPL(security_kernel_read_file);
3193 * security_kernel_post_read_file() - Read a file specified by userspace
3195 * @buf: file contents
3196 * @size: size of file contents
3197 * @id: file identifier
3199 * Read a file specified by userspace. This must be paired with a prior call
3200 * to security_kernel_read_file() call that indicated this hook would also be
3201 * called, see security_kernel_read_file() for more information.
3203 * Return: Returns 0 if permission is granted.
3205 int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
3206 enum kernel_read_file_id id)
3208 return call_int_hook(kernel_post_read_file, file, buf, size, id);
3210 EXPORT_SYMBOL_GPL(security_kernel_post_read_file);
3213 * security_kernel_load_data() - Load data provided by userspace
3214 * @id: data identifier
3215 * @contents: true if security_kernel_post_load_data() will be called
3217 * Load data provided by userspace.
3219 * Return: Returns 0 if permission is granted.
3221 int security_kernel_load_data(enum kernel_load_data_id id, bool contents)
3223 return call_int_hook(kernel_load_data, id, contents);
3225 EXPORT_SYMBOL_GPL(security_kernel_load_data);
3228 * security_kernel_post_load_data() - Load userspace data from a non-file source
3230 * @size: size of data
3231 * @id: data identifier
3232 * @description: text description of data, specific to the id value
3234 * Load data provided by a non-file source (usually userspace buffer). This
3235 * must be paired with a prior security_kernel_load_data() call that indicated
3236 * this hook would also be called, see security_kernel_load_data() for more
3239 * Return: Returns 0 if permission is granted.
3241 int security_kernel_post_load_data(char *buf, loff_t size,
3242 enum kernel_load_data_id id,
3245 return call_int_hook(kernel_post_load_data, buf, size, id, description);
3247 EXPORT_SYMBOL_GPL(security_kernel_post_load_data);
3250 * security_task_fix_setuid() - Update LSM with new user id attributes
3251 * @new: updated credentials
3252 * @old: credentials being replaced
3253 * @flags: LSM_SETID_* flag values
3255 * Update the module's state after setting one or more of the user identity
3256 * attributes of the current process. The @flags parameter indicates which of
3257 * the set*uid system calls invoked this hook. If @new is the set of
3258 * credentials that will be installed. Modifications should be made to this
3259 * rather than to @current->cred.
3261 * Return: Returns 0 on success.
3263 int security_task_fix_setuid(struct cred *new, const struct cred *old,
3266 return call_int_hook(task_fix_setuid, new, old, flags);
3270 * security_task_fix_setgid() - Update LSM with new group id attributes
3271 * @new: updated credentials
3272 * @old: credentials being replaced
3273 * @flags: LSM_SETID_* flag value
3275 * Update the module's state after setting one or more of the group identity
3276 * attributes of the current process. The @flags parameter indicates which of
3277 * the set*gid system calls invoked this hook. @new is the set of credentials
3278 * that will be installed. Modifications should be made to this rather than to
3281 * Return: Returns 0 on success.
3283 int security_task_fix_setgid(struct cred *new, const struct cred *old,
3286 return call_int_hook(task_fix_setgid, new, old, flags);
3290 * security_task_fix_setgroups() - Update LSM with new supplementary groups
3291 * @new: updated credentials
3292 * @old: credentials being replaced
3294 * Update the module's state after setting the supplementary group identity
3295 * attributes of the current process. @new is the set of credentials that will
3296 * be installed. Modifications should be made to this rather than to
3299 * Return: Returns 0 on success.
3301 int security_task_fix_setgroups(struct cred *new, const struct cred *old)
3303 return call_int_hook(task_fix_setgroups, new, old);
3307 * security_task_setpgid() - Check if setting the pgid is allowed
3308 * @p: task being modified
3311 * Check permission before setting the process group identifier of the process
3314 * Return: Returns 0 if permission is granted.
3316 int security_task_setpgid(struct task_struct *p, pid_t pgid)
3318 return call_int_hook(task_setpgid, p, pgid);
3322 * security_task_getpgid() - Check if getting the pgid is allowed
3325 * Check permission before getting the process group identifier of the process
3328 * Return: Returns 0 if permission is granted.
3330 int security_task_getpgid(struct task_struct *p)
3332 return call_int_hook(task_getpgid, p);
3336 * security_task_getsid() - Check if getting the session id is allowed
3339 * Check permission before getting the session identifier of the process @p.
3341 * Return: Returns 0 if permission is granted.
3343 int security_task_getsid(struct task_struct *p)
3345 return call_int_hook(task_getsid, p);
3349 * security_current_getsecid_subj() - Get the current task's subjective secid
3350 * @secid: secid value
3352 * Retrieve the subjective security identifier of the current task and return
3353 * it in @secid. In case of failure, @secid will be set to zero.
3355 void security_current_getsecid_subj(u32 *secid)
3358 call_void_hook(current_getsecid_subj, secid);
3360 EXPORT_SYMBOL(security_current_getsecid_subj);
3363 * security_task_getsecid_obj() - Get a task's objective secid
3365 * @secid: secid value
3367 * Retrieve the objective security identifier of the task_struct in @p and
3368 * return it in @secid. In case of failure, @secid will be set to zero.
3370 void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
3373 call_void_hook(task_getsecid_obj, p, secid);
3375 EXPORT_SYMBOL(security_task_getsecid_obj);
3378 * security_task_setnice() - Check if setting a task's nice value is allowed
3382 * Check permission before setting the nice value of @p to @nice.
3384 * Return: Returns 0 if permission is granted.
3386 int security_task_setnice(struct task_struct *p, int nice)
3388 return call_int_hook(task_setnice, p, nice);
3392 * security_task_setioprio() - Check if setting a task's ioprio is allowed
3394 * @ioprio: ioprio value
3396 * Check permission before setting the ioprio value of @p to @ioprio.
3398 * Return: Returns 0 if permission is granted.
3400 int security_task_setioprio(struct task_struct *p, int ioprio)
3402 return call_int_hook(task_setioprio, p, ioprio);
3406 * security_task_getioprio() - Check if getting a task's ioprio is allowed
3409 * Check permission before getting the ioprio value of @p.
3411 * Return: Returns 0 if permission is granted.
3413 int security_task_getioprio(struct task_struct *p)
3415 return call_int_hook(task_getioprio, p);
3419 * security_task_prlimit() - Check if get/setting resources limits is allowed
3420 * @cred: current task credentials
3421 * @tcred: target task credentials
3422 * @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
3424 * Check permission before getting and/or setting the resource limits of
3427 * Return: Returns 0 if permission is granted.
3429 int security_task_prlimit(const struct cred *cred, const struct cred *tcred,
3432 return call_int_hook(task_prlimit, cred, tcred, flags);
3436 * security_task_setrlimit() - Check if setting a new rlimit value is allowed
3437 * @p: target task's group leader
3438 * @resource: resource whose limit is being set
3439 * @new_rlim: new resource limit
3441 * Check permission before setting the resource limits of process @p for
3442 * @resource to @new_rlim. The old resource limit values can be examined by
3443 * dereferencing (p->signal->rlim + resource).
3445 * Return: Returns 0 if permission is granted.
3447 int security_task_setrlimit(struct task_struct *p, unsigned int resource,
3448 struct rlimit *new_rlim)
3450 return call_int_hook(task_setrlimit, p, resource, new_rlim);
3454 * security_task_setscheduler() - Check if setting sched policy/param is allowed
3457 * Check permission before setting scheduling policy and/or parameters of
3460 * Return: Returns 0 if permission is granted.
3462 int security_task_setscheduler(struct task_struct *p)
3464 return call_int_hook(task_setscheduler, p);
3468 * security_task_getscheduler() - Check if getting scheduling info is allowed
3471 * Check permission before obtaining scheduling information for process @p.
3473 * Return: Returns 0 if permission is granted.
3475 int security_task_getscheduler(struct task_struct *p)
3477 return call_int_hook(task_getscheduler, p);
3481 * security_task_movememory() - Check if moving memory is allowed
3484 * Check permission before moving memory owned by process @p.
3486 * Return: Returns 0 if permission is granted.
3488 int security_task_movememory(struct task_struct *p)
3490 return call_int_hook(task_movememory, p);
3494 * security_task_kill() - Check if sending a signal is allowed
3495 * @p: target process
3496 * @info: signal information
3497 * @sig: signal value
3498 * @cred: credentials of the signal sender, NULL if @current
3500 * Check permission before sending signal @sig to @p. @info can be NULL, the
3501 * constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
3502 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
3503 * the kernel and should typically be permitted. SIGIO signals are handled
3504 * separately by the send_sigiotask hook in file_security_ops.
3506 * Return: Returns 0 if permission is granted.
3508 int security_task_kill(struct task_struct *p, struct kernel_siginfo *info,
3509 int sig, const struct cred *cred)
3511 return call_int_hook(task_kill, p, info, sig, cred);
3515 * security_task_prctl() - Check if a prctl op is allowed
3516 * @option: operation
3522 * Check permission before performing a process control operation on the
3525 * Return: Return -ENOSYS if no-one wanted to handle this op, any other value
3526 * to cause prctl() to return immediately with that value.
3528 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
3529 unsigned long arg4, unsigned long arg5)
3532 int rc = LSM_RET_DEFAULT(task_prctl);
3533 struct security_hook_list *hp;
3535 hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
3536 thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
3537 if (thisrc != LSM_RET_DEFAULT(task_prctl)) {
3547 * security_task_to_inode() - Set the security attributes of a task's inode
3551 * Set the security attributes for an inode based on an associated task's
3552 * security attributes, e.g. for /proc/pid inodes.
3554 void security_task_to_inode(struct task_struct *p, struct inode *inode)
3556 call_void_hook(task_to_inode, p, inode);
3560 * security_create_user_ns() - Check if creating a new userns is allowed
3561 * @cred: prepared creds
3563 * Check permission prior to creating a new user namespace.
3565 * Return: Returns 0 if successful, otherwise < 0 error code.
3567 int security_create_user_ns(const struct cred *cred)
3569 return call_int_hook(userns_create, cred);
3573 * security_ipc_permission() - Check if sysv ipc access is allowed
3574 * @ipcp: ipc permission structure
3575 * @flag: requested permissions
3577 * Check permissions for access to IPC.
3579 * Return: Returns 0 if permission is granted.
3581 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
3583 return call_int_hook(ipc_permission, ipcp, flag);
3587 * security_ipc_getsecid() - Get the sysv ipc object's secid
3588 * @ipcp: ipc permission structure
3589 * @secid: secid pointer
3591 * Get the secid associated with the ipc object. In case of failure, @secid
3592 * will be set to zero.
3594 void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
3597 call_void_hook(ipc_getsecid, ipcp, secid);
3601 * security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
3602 * @msg: message structure
3604 * Allocate and attach a security structure to the msg->security field. The
3605 * security field is initialized to NULL when the structure is first created.
3607 * Return: Return 0 if operation was successful and permission is granted.
3609 int security_msg_msg_alloc(struct msg_msg *msg)
3611 int rc = lsm_msg_msg_alloc(msg);
3615 rc = call_int_hook(msg_msg_alloc_security, msg);
3617 security_msg_msg_free(msg);
3622 * security_msg_msg_free() - Free a sysv ipc message LSM blob
3623 * @msg: message structure
3625 * Deallocate the security structure for this message.
3627 void security_msg_msg_free(struct msg_msg *msg)
3629 call_void_hook(msg_msg_free_security, msg);
3630 kfree(msg->security);
3631 msg->security = NULL;
3635 * security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
3636 * @msq: sysv ipc permission structure
3638 * Allocate and attach a security structure to @msg. The security field is
3639 * initialized to NULL when the structure is first created.
3641 * Return: Returns 0 if operation was successful and permission is granted.
3643 int security_msg_queue_alloc(struct kern_ipc_perm *msq)
3645 int rc = lsm_ipc_alloc(msq);
3649 rc = call_int_hook(msg_queue_alloc_security, msq);
3651 security_msg_queue_free(msq);
3656 * security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
3657 * @msq: sysv ipc permission structure
3659 * Deallocate security field @perm->security for the message queue.
3661 void security_msg_queue_free(struct kern_ipc_perm *msq)
3663 call_void_hook(msg_queue_free_security, msq);
3664 kfree(msq->security);
3665 msq->security = NULL;
3669 * security_msg_queue_associate() - Check if a msg queue operation is allowed
3670 * @msq: sysv ipc permission structure
3671 * @msqflg: operation flags
3673 * Check permission when a message queue is requested through the msgget system
3674 * call. This hook is only called when returning the message queue identifier
3675 * for an existing message queue, not when a new message queue is created.
3677 * Return: Return 0 if permission is granted.
3679 int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
3681 return call_int_hook(msg_queue_associate, msq, msqflg);
3685 * security_msg_queue_msgctl() - Check if a msg queue operation is allowed
3686 * @msq: sysv ipc permission structure
3689 * Check permission when a message control operation specified by @cmd is to be
3690 * performed on the message queue with permissions.
3692 * Return: Returns 0 if permission is granted.
3694 int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
3696 return call_int_hook(msg_queue_msgctl, msq, cmd);
3700 * security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
3701 * @msq: sysv ipc permission structure
3703 * @msqflg: operation flags
3705 * Check permission before a message, @msg, is enqueued on the message queue
3706 * with permissions specified in @msq.
3708 * Return: Returns 0 if permission is granted.
3710 int security_msg_queue_msgsnd(struct kern_ipc_perm *msq,
3711 struct msg_msg *msg, int msqflg)
3713 return call_int_hook(msg_queue_msgsnd, msq, msg, msqflg);
3717 * security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
3718 * @msq: sysv ipc permission structure
3720 * @target: target task
3721 * @type: type of message requested
3722 * @mode: operation flags
3724 * Check permission before a message, @msg, is removed from the message queue.
3725 * The @target task structure contains a pointer to the process that will be
3726 * receiving the message (not equal to the current process when inline receives
3727 * are being performed).
3729 * Return: Returns 0 if permission is granted.
3731 int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
3732 struct task_struct *target, long type, int mode)
3734 return call_int_hook(msg_queue_msgrcv, msq, msg, target, type, mode);
3738 * security_shm_alloc() - Allocate a sysv shm LSM blob
3739 * @shp: sysv ipc permission structure
3741 * Allocate and attach a security structure to the @shp security field. The
3742 * security field is initialized to NULL when the structure is first created.
3744 * Return: Returns 0 if operation was successful and permission is granted.
3746 int security_shm_alloc(struct kern_ipc_perm *shp)
3748 int rc = lsm_ipc_alloc(shp);
3752 rc = call_int_hook(shm_alloc_security, shp);
3754 security_shm_free(shp);
3759 * security_shm_free() - Free a sysv shm LSM blob
3760 * @shp: sysv ipc permission structure
3762 * Deallocate the security structure @perm->security for the memory segment.
3764 void security_shm_free(struct kern_ipc_perm *shp)
3766 call_void_hook(shm_free_security, shp);
3767 kfree(shp->security);
3768 shp->security = NULL;
3772 * security_shm_associate() - Check if a sysv shm operation is allowed
3773 * @shp: sysv ipc permission structure
3774 * @shmflg: operation flags
3776 * Check permission when a shared memory region is requested through the shmget
3777 * system call. This hook is only called when returning the shared memory
3778 * region identifier for an existing region, not when a new shared memory
3779 * region is created.
3781 * Return: Returns 0 if permission is granted.
3783 int security_shm_associate(struct kern_ipc_perm *shp, int shmflg)
3785 return call_int_hook(shm_associate, shp, shmflg);
3789 * security_shm_shmctl() - Check if a sysv shm operation is allowed
3790 * @shp: sysv ipc permission structure
3793 * Check permission when a shared memory control operation specified by @cmd is
3794 * to be performed on the shared memory region with permissions in @shp.
3796 * Return: Return 0 if permission is granted.
3798 int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
3800 return call_int_hook(shm_shmctl, shp, cmd);
3804 * security_shm_shmat() - Check if a sysv shm attach operation is allowed
3805 * @shp: sysv ipc permission structure
3806 * @shmaddr: address of memory region to attach
3807 * @shmflg: operation flags
3809 * Check permissions prior to allowing the shmat system call to attach the
3810 * shared memory segment with permissions @shp to the data segment of the
3811 * calling process. The attaching address is specified by @shmaddr.
3813 * Return: Returns 0 if permission is granted.
3815 int security_shm_shmat(struct kern_ipc_perm *shp,
3816 char __user *shmaddr, int shmflg)
3818 return call_int_hook(shm_shmat, shp, shmaddr, shmflg);
3822 * security_sem_alloc() - Allocate a sysv semaphore LSM blob
3823 * @sma: sysv ipc permission structure
3825 * Allocate and attach a security structure to the @sma security field. The
3826 * security field is initialized to NULL when the structure is first created.
3828 * Return: Returns 0 if operation was successful and permission is granted.
3830 int security_sem_alloc(struct kern_ipc_perm *sma)
3832 int rc = lsm_ipc_alloc(sma);
3836 rc = call_int_hook(sem_alloc_security, sma);
3838 security_sem_free(sma);
3843 * security_sem_free() - Free a sysv semaphore LSM blob
3844 * @sma: sysv ipc permission structure
3846 * Deallocate security structure @sma->security for the semaphore.
3848 void security_sem_free(struct kern_ipc_perm *sma)
3850 call_void_hook(sem_free_security, sma);
3851 kfree(sma->security);
3852 sma->security = NULL;
3856 * security_sem_associate() - Check if a sysv semaphore operation is allowed
3857 * @sma: sysv ipc permission structure
3858 * @semflg: operation flags
3860 * Check permission when a semaphore is requested through the semget system
3861 * call. This hook is only called when returning the semaphore identifier for
3862 * an existing semaphore, not when a new one must be created.
3864 * Return: Returns 0 if permission is granted.
3866 int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
3868 return call_int_hook(sem_associate, sma, semflg);
3872 * security_sem_semctl() - Check if a sysv semaphore operation is allowed
3873 * @sma: sysv ipc permission structure
3876 * Check permission when a semaphore operation specified by @cmd is to be
3877 * performed on the semaphore.
3879 * Return: Returns 0 if permission is granted.
3881 int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
3883 return call_int_hook(sem_semctl, sma, cmd);
3887 * security_sem_semop() - Check if a sysv semaphore operation is allowed
3888 * @sma: sysv ipc permission structure
3889 * @sops: operations to perform
3890 * @nsops: number of operations
3891 * @alter: flag indicating changes will be made
3893 * Check permissions before performing operations on members of the semaphore
3894 * set. If the @alter flag is nonzero, the semaphore set may be modified.
3896 * Return: Returns 0 if permission is granted.
3898 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
3899 unsigned nsops, int alter)
3901 return call_int_hook(sem_semop, sma, sops, nsops, alter);
3905 * security_d_instantiate() - Populate an inode's LSM state based on a dentry
3909 * Fill in @inode security information for a @dentry if allowed.
3911 void security_d_instantiate(struct dentry *dentry, struct inode *inode)
3913 if (unlikely(inode && IS_PRIVATE(inode)))
3915 call_void_hook(d_instantiate, dentry, inode);
3917 EXPORT_SYMBOL(security_d_instantiate);
3920 * Please keep this in sync with it's counterpart in security/lsm_syscalls.c
3924 * security_getselfattr - Read an LSM attribute of the current process.
3925 * @attr: which attribute to return
3926 * @uctx: the user-space destination for the information, or NULL
3927 * @size: pointer to the size of space available to receive the data
3928 * @flags: special handling options. LSM_FLAG_SINGLE indicates that only
3929 * attributes associated with the LSM identified in the passed @ctx be
3932 * A NULL value for @uctx can be used to get both the number of attributes
3933 * and the size of the data.
3935 * Returns the number of attributes found on success, negative value
3936 * on error. @size is reset to the total size of the data.
3937 * If @size is insufficient to contain the data -E2BIG is returned.
3939 int security_getselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
3940 u32 __user *size, u32 flags)
3942 struct security_hook_list *hp;
3943 struct lsm_ctx lctx = { .id = LSM_ID_UNDEF, };
3944 u8 __user *base = (u8 __user *)uctx;
3948 bool toobig = false;
3949 bool single = false;
3953 if (attr == LSM_ATTR_UNDEF)
3957 if (get_user(left, size))
3962 * Only flag supported is LSM_FLAG_SINGLE
3964 if (flags != LSM_FLAG_SINGLE || !uctx)
3966 if (copy_from_user(&lctx, uctx, sizeof(lctx)))
3969 * If the LSM ID isn't specified it is an error.
3971 if (lctx.id == LSM_ID_UNDEF)
3977 * In the usual case gather all the data from the LSMs.
3978 * In the single case only get the data from the LSM specified.
3980 hlist_for_each_entry(hp, &security_hook_heads.getselfattr, list) {
3981 if (single && lctx.id != hp->lsmid->id)
3985 uctx = (struct lsm_ctx __user *)(base + total);
3986 rc = hp->hook.getselfattr(attr, uctx, &entrysize, flags);
3987 if (rc == -EOPNOTSUPP) {
4005 if (put_user(total, size))
4010 return LSM_RET_DEFAULT(getselfattr);
4015 * Please keep this in sync with it's counterpart in security/lsm_syscalls.c
4019 * security_setselfattr - Set an LSM attribute on the current process.
4020 * @attr: which attribute to set
4021 * @uctx: the user-space source for the information
4022 * @size: the size of the data
4023 * @flags: reserved for future use, must be 0
4025 * Set an LSM attribute for the current process. The LSM, attribute
4026 * and new value are included in @uctx.
4028 * Returns 0 on success, -EINVAL if the input is inconsistent, -EFAULT
4029 * if the user buffer is inaccessible, E2BIG if size is too big, or an
4030 * LSM specific failure.
4032 int security_setselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
4033 u32 size, u32 flags)
4035 struct security_hook_list *hp;
4036 struct lsm_ctx *lctx;
4037 int rc = LSM_RET_DEFAULT(setselfattr);
4042 if (size < sizeof(*lctx))
4044 if (size > PAGE_SIZE)
4047 lctx = memdup_user(uctx, size);
4049 return PTR_ERR(lctx);
4051 if (size < lctx->len ||
4052 check_add_overflow(sizeof(*lctx), lctx->ctx_len, &required_len) ||
4053 lctx->len < required_len) {
4058 hlist_for_each_entry(hp, &security_hook_heads.setselfattr, list)
4059 if ((hp->lsmid->id) == lctx->id) {
4060 rc = hp->hook.setselfattr(attr, lctx, size, flags);
4070 * security_getprocattr() - Read an attribute for a task
4072 * @lsmid: LSM identification
4073 * @name: attribute name
4074 * @value: attribute value
4076 * Read attribute @name for task @p and store it into @value if allowed.
4078 * Return: Returns the length of @value on success, a negative value otherwise.
4080 int security_getprocattr(struct task_struct *p, int lsmid, const char *name,
4083 struct security_hook_list *hp;
4085 hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
4086 if (lsmid != 0 && lsmid != hp->lsmid->id)
4088 return hp->hook.getprocattr(p, name, value);
4090 return LSM_RET_DEFAULT(getprocattr);
4094 * security_setprocattr() - Set an attribute for a task
4095 * @lsmid: LSM identification
4096 * @name: attribute name
4097 * @value: attribute value
4098 * @size: attribute value size
4100 * Write (set) the current task's attribute @name to @value, size @size if
4103 * Return: Returns bytes written on success, a negative value otherwise.
4105 int security_setprocattr(int lsmid, const char *name, void *value, size_t size)
4107 struct security_hook_list *hp;
4109 hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
4110 if (lsmid != 0 && lsmid != hp->lsmid->id)
4112 return hp->hook.setprocattr(name, value, size);
4114 return LSM_RET_DEFAULT(setprocattr);
4118 * security_netlink_send() - Save info and check if netlink sending is allowed
4119 * @sk: sending socket
4120 * @skb: netlink message
4122 * Save security information for a netlink message so that permission checking
4123 * can be performed when the message is processed. The security information
4124 * can be saved using the eff_cap field of the netlink_skb_parms structure.
4125 * Also may be used to provide fine grained control over message transmission.
4127 * Return: Returns 0 if the information was successfully saved and message is
4128 * allowed to be transmitted.
4130 int security_netlink_send(struct sock *sk, struct sk_buff *skb)
4132 return call_int_hook(netlink_send, sk, skb);
4136 * security_ismaclabel() - Check if the named attribute is a MAC label
4137 * @name: full extended attribute name
4139 * Check if the extended attribute specified by @name represents a MAC label.
4141 * Return: Returns 1 if name is a MAC attribute otherwise returns 0.
4143 int security_ismaclabel(const char *name)
4145 return call_int_hook(ismaclabel, name);
4147 EXPORT_SYMBOL(security_ismaclabel);
4150 * security_secid_to_secctx() - Convert a secid to a secctx
4153 * @seclen: secctx length
4155 * Convert secid to security context. If @secdata is NULL the length of the
4156 * result will be returned in @seclen, but no @secdata will be returned. This
4157 * does mean that the length could change between calls to check the length and
4158 * the next call which actually allocates and returns the @secdata.
4160 * Return: Return 0 on success, error on failure.
4162 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4164 return call_int_hook(secid_to_secctx, secid, secdata, seclen);
4166 EXPORT_SYMBOL(security_secid_to_secctx);
4169 * security_secctx_to_secid() - Convert a secctx to a secid
4171 * @seclen: length of secctx
4174 * Convert security context to secid.
4176 * Return: Returns 0 on success, error on failure.
4178 int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4181 return call_int_hook(secctx_to_secid, secdata, seclen, secid);
4183 EXPORT_SYMBOL(security_secctx_to_secid);
4186 * security_release_secctx() - Free a secctx buffer
4188 * @seclen: length of secctx
4190 * Release the security context.
4192 void security_release_secctx(char *secdata, u32 seclen)
4194 call_void_hook(release_secctx, secdata, seclen);
4196 EXPORT_SYMBOL(security_release_secctx);
4199 * security_inode_invalidate_secctx() - Invalidate an inode's security label
4202 * Notify the security module that it must revalidate the security context of
4205 void security_inode_invalidate_secctx(struct inode *inode)
4207 call_void_hook(inode_invalidate_secctx, inode);
4209 EXPORT_SYMBOL(security_inode_invalidate_secctx);
4212 * security_inode_notifysecctx() - Notify the LSM of an inode's security label
4215 * @ctxlen: length of secctx
4217 * Notify the security module of what the security context of an inode should
4218 * be. Initializes the incore security context managed by the security module
4219 * for this inode. Example usage: NFS client invokes this hook to initialize
4220 * the security context in its incore inode to the value provided by the server
4221 * for the file when the server returned the file's attributes to the client.
4222 * Must be called with inode->i_mutex locked.
4224 * Return: Returns 0 on success, error on failure.
4226 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4228 return call_int_hook(inode_notifysecctx, inode, ctx, ctxlen);
4230 EXPORT_SYMBOL(security_inode_notifysecctx);
4233 * security_inode_setsecctx() - Change the security label of an inode
4236 * @ctxlen: length of secctx
4238 * Change the security context of an inode. Updates the incore security
4239 * context managed by the security module and invokes the fs code as needed
4240 * (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
4241 * context. Example usage: NFS server invokes this hook to change the security
4242 * context in its incore inode and on the backing filesystem to a value
4243 * provided by the client on a SETATTR operation. Must be called with
4244 * inode->i_mutex locked.
4246 * Return: Returns 0 on success, error on failure.
4248 int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4250 return call_int_hook(inode_setsecctx, dentry, ctx, ctxlen);
4252 EXPORT_SYMBOL(security_inode_setsecctx);
4255 * security_inode_getsecctx() - Get the security label of an inode
4258 * @ctxlen: length of secctx
4260 * On success, returns 0 and fills out @ctx and @ctxlen with the security
4261 * context for the given @inode.
4263 * Return: Returns 0 on success, error on failure.
4265 int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4267 return call_int_hook(inode_getsecctx, inode, ctx, ctxlen);
4269 EXPORT_SYMBOL(security_inode_getsecctx);
4271 #ifdef CONFIG_WATCH_QUEUE
4273 * security_post_notification() - Check if a watch notification can be posted
4274 * @w_cred: credentials of the task that set the watch
4275 * @cred: credentials of the task which triggered the watch
4276 * @n: the notification
4278 * Check to see if a watch notification can be posted to a particular queue.
4280 * Return: Returns 0 if permission is granted.
4282 int security_post_notification(const struct cred *w_cred,
4283 const struct cred *cred,
4284 struct watch_notification *n)
4286 return call_int_hook(post_notification, w_cred, cred, n);
4288 #endif /* CONFIG_WATCH_QUEUE */
4290 #ifdef CONFIG_KEY_NOTIFICATIONS
4292 * security_watch_key() - Check if a task is allowed to watch for key events
4293 * @key: the key to watch
4295 * Check to see if a process is allowed to watch for event notifications from
4298 * Return: Returns 0 if permission is granted.
4300 int security_watch_key(struct key *key)
4302 return call_int_hook(watch_key, key);
4304 #endif /* CONFIG_KEY_NOTIFICATIONS */
4306 #ifdef CONFIG_SECURITY_NETWORK
4308 * security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
4309 * @sock: originating sock
4313 * Check permissions before establishing a Unix domain stream connection
4314 * between @sock and @other.
4316 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4317 * Linux provides an alternative to the conventional file name space for Unix
4318 * domain sockets. Whereas binding and connecting to sockets in the file name
4319 * space is mediated by the typical file permissions (and caught by the mknod
4320 * and permission hooks in inode_security_ops), binding and connecting to
4321 * sockets in the abstract name space is completely unmediated. Sufficient
4322 * control of Unix domain sockets in the abstract name space isn't possible
4323 * using only the socket layer hooks, since we need to know the actual target
4324 * socket, which is not looked up until we are inside the af_unix code.
4326 * Return: Returns 0 if permission is granted.
4328 int security_unix_stream_connect(struct sock *sock, struct sock *other,
4331 return call_int_hook(unix_stream_connect, sock, other, newsk);
4333 EXPORT_SYMBOL(security_unix_stream_connect);
4336 * security_unix_may_send() - Check if AF_UNIX socket can send datagrams
4337 * @sock: originating sock
4340 * Check permissions before connecting or sending datagrams from @sock to
4343 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4344 * Linux provides an alternative to the conventional file name space for Unix
4345 * domain sockets. Whereas binding and connecting to sockets in the file name
4346 * space is mediated by the typical file permissions (and caught by the mknod
4347 * and permission hooks in inode_security_ops), binding and connecting to
4348 * sockets in the abstract name space is completely unmediated. Sufficient
4349 * control of Unix domain sockets in the abstract name space isn't possible
4350 * using only the socket layer hooks, since we need to know the actual target
4351 * socket, which is not looked up until we are inside the af_unix code.
4353 * Return: Returns 0 if permission is granted.
4355 int security_unix_may_send(struct socket *sock, struct socket *other)
4357 return call_int_hook(unix_may_send, sock, other);
4359 EXPORT_SYMBOL(security_unix_may_send);
4362 * security_socket_create() - Check if creating a new socket is allowed
4363 * @family: protocol family
4364 * @type: communications type
4365 * @protocol: requested protocol
4366 * @kern: set to 1 if a kernel socket is requested
4368 * Check permissions prior to creating a new socket.
4370 * Return: Returns 0 if permission is granted.
4372 int security_socket_create(int family, int type, int protocol, int kern)
4374 return call_int_hook(socket_create, family, type, protocol, kern);
4378 * security_socket_post_create() - Initialize a newly created socket
4380 * @family: protocol family
4381 * @type: communications type
4382 * @protocol: requested protocol
4383 * @kern: set to 1 if a kernel socket is requested
4385 * This hook allows a module to update or allocate a per-socket security
4386 * structure. Note that the security field was not added directly to the socket
4387 * structure, but rather, the socket security information is stored in the
4388 * associated inode. Typically, the inode alloc_security hook will allocate
4389 * and attach security information to SOCK_INODE(sock)->i_security. This hook
4390 * may be used to update the SOCK_INODE(sock)->i_security field with additional
4391 * information that wasn't available when the inode was allocated.
4393 * Return: Returns 0 if permission is granted.
4395 int security_socket_post_create(struct socket *sock, int family,
4396 int type, int protocol, int kern)
4398 return call_int_hook(socket_post_create, sock, family, type,
4403 * security_socket_socketpair() - Check if creating a socketpair is allowed
4404 * @socka: first socket
4405 * @sockb: second socket
4407 * Check permissions before creating a fresh pair of sockets.
4409 * Return: Returns 0 if permission is granted and the connection was
4412 int security_socket_socketpair(struct socket *socka, struct socket *sockb)
4414 return call_int_hook(socket_socketpair, socka, sockb);
4416 EXPORT_SYMBOL(security_socket_socketpair);
4419 * security_socket_bind() - Check if a socket bind operation is allowed
4421 * @address: requested bind address
4422 * @addrlen: length of address
4424 * Check permission before socket protocol layer bind operation is performed
4425 * and the socket @sock is bound to the address specified in the @address
4428 * Return: Returns 0 if permission is granted.
4430 int security_socket_bind(struct socket *sock,
4431 struct sockaddr *address, int addrlen)
4433 return call_int_hook(socket_bind, sock, address, addrlen);
4437 * security_socket_connect() - Check if a socket connect operation is allowed
4439 * @address: address of remote connection point
4440 * @addrlen: length of address
4442 * Check permission before socket protocol layer connect operation attempts to
4443 * connect socket @sock to a remote address, @address.
4445 * Return: Returns 0 if permission is granted.
4447 int security_socket_connect(struct socket *sock,
4448 struct sockaddr *address, int addrlen)
4450 return call_int_hook(socket_connect, sock, address, addrlen);
4454 * security_socket_listen() - Check if a socket is allowed to listen
4456 * @backlog: connection queue size
4458 * Check permission before socket protocol layer listen operation.
4460 * Return: Returns 0 if permission is granted.
4462 int security_socket_listen(struct socket *sock, int backlog)
4464 return call_int_hook(socket_listen, sock, backlog);
4468 * security_socket_accept() - Check if a socket is allowed to accept connections
4469 * @sock: listening socket
4470 * @newsock: newly creation connection socket
4472 * Check permission before accepting a new connection. Note that the new
4473 * socket, @newsock, has been created and some information copied to it, but
4474 * the accept operation has not actually been performed.
4476 * Return: Returns 0 if permission is granted.
4478 int security_socket_accept(struct socket *sock, struct socket *newsock)
4480 return call_int_hook(socket_accept, sock, newsock);
4484 * security_socket_sendmsg() - Check if sending a message is allowed
4485 * @sock: sending socket
4486 * @msg: message to send
4487 * @size: size of message
4489 * Check permission before transmitting a message to another socket.
4491 * Return: Returns 0 if permission is granted.
4493 int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
4495 return call_int_hook(socket_sendmsg, sock, msg, size);
4499 * security_socket_recvmsg() - Check if receiving a message is allowed
4500 * @sock: receiving socket
4501 * @msg: message to receive
4502 * @size: size of message
4503 * @flags: operational flags
4505 * Check permission before receiving a message from a socket.
4507 * Return: Returns 0 if permission is granted.
4509 int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
4510 int size, int flags)
4512 return call_int_hook(socket_recvmsg, sock, msg, size, flags);
4516 * security_socket_getsockname() - Check if reading the socket addr is allowed
4519 * Check permission before reading the local address (name) of the socket
4522 * Return: Returns 0 if permission is granted.
4524 int security_socket_getsockname(struct socket *sock)
4526 return call_int_hook(socket_getsockname, sock);
4530 * security_socket_getpeername() - Check if reading the peer's addr is allowed
4533 * Check permission before the remote address (name) of a socket object.
4535 * Return: Returns 0 if permission is granted.
4537 int security_socket_getpeername(struct socket *sock)
4539 return call_int_hook(socket_getpeername, sock);
4543 * security_socket_getsockopt() - Check if reading a socket option is allowed
4545 * @level: option's protocol level
4546 * @optname: option name
4548 * Check permissions before retrieving the options associated with socket
4551 * Return: Returns 0 if permission is granted.
4553 int security_socket_getsockopt(struct socket *sock, int level, int optname)
4555 return call_int_hook(socket_getsockopt, sock, level, optname);
4559 * security_socket_setsockopt() - Check if setting a socket option is allowed
4561 * @level: option's protocol level
4562 * @optname: option name
4564 * Check permissions before setting the options associated with socket @sock.
4566 * Return: Returns 0 if permission is granted.
4568 int security_socket_setsockopt(struct socket *sock, int level, int optname)
4570 return call_int_hook(socket_setsockopt, sock, level, optname);
4574 * security_socket_shutdown() - Checks if shutting down the socket is allowed
4576 * @how: flag indicating how sends and receives are handled
4578 * Checks permission before all or part of a connection on the socket @sock is
4581 * Return: Returns 0 if permission is granted.
4583 int security_socket_shutdown(struct socket *sock, int how)
4585 return call_int_hook(socket_shutdown, sock, how);
4589 * security_sock_rcv_skb() - Check if an incoming network packet is allowed
4590 * @sk: destination sock
4591 * @skb: incoming packet
4593 * Check permissions on incoming network packets. This hook is distinct from
4594 * Netfilter's IP input hooks since it is the first time that the incoming
4595 * sk_buff @skb has been associated with a particular socket, @sk. Must not
4596 * sleep inside this hook because some callers hold spinlocks.
4598 * Return: Returns 0 if permission is granted.
4600 int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
4602 return call_int_hook(socket_sock_rcv_skb, sk, skb);
4604 EXPORT_SYMBOL(security_sock_rcv_skb);
4607 * security_socket_getpeersec_stream() - Get the remote peer label
4609 * @optval: destination buffer
4610 * @optlen: size of peer label copied into the buffer
4611 * @len: maximum size of the destination buffer
4613 * This hook allows the security module to provide peer socket security state
4614 * for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
4615 * For tcp sockets this can be meaningful if the socket is associated with an
4618 * Return: Returns 0 if all is well, otherwise, typical getsockopt return
4621 int security_socket_getpeersec_stream(struct socket *sock, sockptr_t optval,
4622 sockptr_t optlen, unsigned int len)
4624 return call_int_hook(socket_getpeersec_stream, sock, optval, optlen,
4629 * security_socket_getpeersec_dgram() - Get the remote peer label
4631 * @skb: datagram packet
4632 * @secid: remote peer label secid
4634 * This hook allows the security module to provide peer socket security state
4635 * for udp sockets on a per-packet basis to userspace via getsockopt
4636 * SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
4637 * option via getsockopt. It can then retrieve the security state returned by
4638 * this hook for a packet via the SCM_SECURITY ancillary message type.
4640 * Return: Returns 0 on success, error on failure.
4642 int security_socket_getpeersec_dgram(struct socket *sock,
4643 struct sk_buff *skb, u32 *secid)
4645 return call_int_hook(socket_getpeersec_dgram, sock, skb, secid);
4647 EXPORT_SYMBOL(security_socket_getpeersec_dgram);
4650 * security_sk_alloc() - Allocate and initialize a sock's LSM blob
4652 * @family: protocol family
4653 * @priority: gfp flags
4655 * Allocate and attach a security structure to the sk->sk_security field, which
4656 * is used to copy security attributes between local stream sockets.
4658 * Return: Returns 0 on success, error on failure.
4660 int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
4662 return call_int_hook(sk_alloc_security, sk, family, priority);
4666 * security_sk_free() - Free the sock's LSM blob
4669 * Deallocate security structure.
4671 void security_sk_free(struct sock *sk)
4673 call_void_hook(sk_free_security, sk);
4677 * security_sk_clone() - Clone a sock's LSM state
4678 * @sk: original sock
4679 * @newsk: target sock
4681 * Clone/copy security structure.
4683 void security_sk_clone(const struct sock *sk, struct sock *newsk)
4685 call_void_hook(sk_clone_security, sk, newsk);
4687 EXPORT_SYMBOL(security_sk_clone);
4690 * security_sk_classify_flow() - Set a flow's secid based on socket
4691 * @sk: original socket
4692 * @flic: target flow
4694 * Set the target flow's secid to socket's secid.
4696 void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic)
4698 call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
4700 EXPORT_SYMBOL(security_sk_classify_flow);
4703 * security_req_classify_flow() - Set a flow's secid based on request_sock
4704 * @req: request_sock
4705 * @flic: target flow
4707 * Sets @flic's secid to @req's secid.
4709 void security_req_classify_flow(const struct request_sock *req,
4710 struct flowi_common *flic)
4712 call_void_hook(req_classify_flow, req, flic);
4714 EXPORT_SYMBOL(security_req_classify_flow);
4717 * security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
4718 * @sk: sock being grafted
4719 * @parent: target parent socket
4721 * Sets @parent's inode secid to @sk's secid and update @sk with any necessary
4722 * LSM state from @parent.
4724 void security_sock_graft(struct sock *sk, struct socket *parent)
4726 call_void_hook(sock_graft, sk, parent);
4728 EXPORT_SYMBOL(security_sock_graft);
4731 * security_inet_conn_request() - Set request_sock state using incoming connect
4732 * @sk: parent listening sock
4733 * @skb: incoming connection
4734 * @req: new request_sock
4736 * Initialize the @req LSM state based on @sk and the incoming connect in @skb.
4738 * Return: Returns 0 if permission is granted.
4740 int security_inet_conn_request(const struct sock *sk,
4741 struct sk_buff *skb, struct request_sock *req)
4743 return call_int_hook(inet_conn_request, sk, skb, req);
4745 EXPORT_SYMBOL(security_inet_conn_request);
4748 * security_inet_csk_clone() - Set new sock LSM state based on request_sock
4750 * @req: connection request_sock
4752 * Set that LSM state of @sock using the LSM state from @req.
4754 void security_inet_csk_clone(struct sock *newsk,
4755 const struct request_sock *req)
4757 call_void_hook(inet_csk_clone, newsk, req);
4761 * security_inet_conn_established() - Update sock's LSM state with connection
4763 * @skb: connection packet
4765 * Update @sock's LSM state to represent a new connection from @skb.
4767 void security_inet_conn_established(struct sock *sk,
4768 struct sk_buff *skb)
4770 call_void_hook(inet_conn_established, sk, skb);
4772 EXPORT_SYMBOL(security_inet_conn_established);
4775 * security_secmark_relabel_packet() - Check if setting a secmark is allowed
4776 * @secid: new secmark value
4778 * Check if the process should be allowed to relabel packets to @secid.
4780 * Return: Returns 0 if permission is granted.
4782 int security_secmark_relabel_packet(u32 secid)
4784 return call_int_hook(secmark_relabel_packet, secid);
4786 EXPORT_SYMBOL(security_secmark_relabel_packet);
4789 * security_secmark_refcount_inc() - Increment the secmark labeling rule count
4791 * Tells the LSM to increment the number of secmark labeling rules loaded.
4793 void security_secmark_refcount_inc(void)
4795 call_void_hook(secmark_refcount_inc);
4797 EXPORT_SYMBOL(security_secmark_refcount_inc);
4800 * security_secmark_refcount_dec() - Decrement the secmark labeling rule count
4802 * Tells the LSM to decrement the number of secmark labeling rules loaded.
4804 void security_secmark_refcount_dec(void)
4806 call_void_hook(secmark_refcount_dec);
4808 EXPORT_SYMBOL(security_secmark_refcount_dec);
4811 * security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
4812 * @security: pointer to the LSM blob
4814 * This hook allows a module to allocate a security structure for a TUN device,
4815 * returning the pointer in @security.
4817 * Return: Returns a zero on success, negative values on failure.
4819 int security_tun_dev_alloc_security(void **security)
4821 return call_int_hook(tun_dev_alloc_security, security);
4823 EXPORT_SYMBOL(security_tun_dev_alloc_security);
4826 * security_tun_dev_free_security() - Free a TUN device LSM blob
4827 * @security: LSM blob
4829 * This hook allows a module to free the security structure for a TUN device.
4831 void security_tun_dev_free_security(void *security)
4833 call_void_hook(tun_dev_free_security, security);
4835 EXPORT_SYMBOL(security_tun_dev_free_security);
4838 * security_tun_dev_create() - Check if creating a TUN device is allowed
4840 * Check permissions prior to creating a new TUN device.
4842 * Return: Returns 0 if permission is granted.
4844 int security_tun_dev_create(void)
4846 return call_int_hook(tun_dev_create);
4848 EXPORT_SYMBOL(security_tun_dev_create);
4851 * security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
4852 * @security: TUN device LSM blob
4854 * Check permissions prior to attaching to a TUN device queue.
4856 * Return: Returns 0 if permission is granted.
4858 int security_tun_dev_attach_queue(void *security)
4860 return call_int_hook(tun_dev_attach_queue, security);
4862 EXPORT_SYMBOL(security_tun_dev_attach_queue);
4865 * security_tun_dev_attach() - Update TUN device LSM state on attach
4866 * @sk: associated sock
4867 * @security: TUN device LSM blob
4869 * This hook can be used by the module to update any security state associated
4870 * with the TUN device's sock structure.
4872 * Return: Returns 0 if permission is granted.
4874 int security_tun_dev_attach(struct sock *sk, void *security)
4876 return call_int_hook(tun_dev_attach, sk, security);
4878 EXPORT_SYMBOL(security_tun_dev_attach);
4881 * security_tun_dev_open() - Update TUN device LSM state on open
4882 * @security: TUN device LSM blob
4884 * This hook can be used by the module to update any security state associated
4885 * with the TUN device's security structure.
4887 * Return: Returns 0 if permission is granted.
4889 int security_tun_dev_open(void *security)
4891 return call_int_hook(tun_dev_open, security);
4893 EXPORT_SYMBOL(security_tun_dev_open);
4896 * security_sctp_assoc_request() - Update the LSM on a SCTP association req
4897 * @asoc: SCTP association
4898 * @skb: packet requesting the association
4900 * Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
4902 * Return: Returns 0 on success, error on failure.
4904 int security_sctp_assoc_request(struct sctp_association *asoc,
4905 struct sk_buff *skb)
4907 return call_int_hook(sctp_assoc_request, asoc, skb);
4909 EXPORT_SYMBOL(security_sctp_assoc_request);
4912 * security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
4914 * @optname: SCTP option to validate
4915 * @address: list of IP addresses to validate
4916 * @addrlen: length of the address list
4918 * Validiate permissions required for each address associated with sock @sk.
4919 * Depending on @optname, the addresses will be treated as either a connect or
4920 * bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
4921 * sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
4923 * Return: Returns 0 on success, error on failure.
4925 int security_sctp_bind_connect(struct sock *sk, int optname,
4926 struct sockaddr *address, int addrlen)
4928 return call_int_hook(sctp_bind_connect, sk, optname, address, addrlen);
4930 EXPORT_SYMBOL(security_sctp_bind_connect);
4933 * security_sctp_sk_clone() - Clone a SCTP sock's LSM state
4934 * @asoc: SCTP association
4935 * @sk: original sock
4936 * @newsk: target sock
4938 * Called whenever a new socket is created by accept(2) (i.e. a TCP style
4939 * socket) or when a socket is 'peeled off' e.g userspace calls
4942 void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
4945 call_void_hook(sctp_sk_clone, asoc, sk, newsk);
4947 EXPORT_SYMBOL(security_sctp_sk_clone);
4950 * security_sctp_assoc_established() - Update LSM state when assoc established
4951 * @asoc: SCTP association
4952 * @skb: packet establishing the association
4954 * Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
4957 * Return: Returns 0 if permission is granted.
4959 int security_sctp_assoc_established(struct sctp_association *asoc,
4960 struct sk_buff *skb)
4962 return call_int_hook(sctp_assoc_established, asoc, skb);
4964 EXPORT_SYMBOL(security_sctp_assoc_established);
4967 * security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
4968 * @sk: the owning MPTCP socket
4969 * @ssk: the new subflow
4971 * Update the labeling for the given MPTCP subflow, to match the one of the
4972 * owning MPTCP socket. This hook has to be called after the socket creation and
4973 * initialization via the security_socket_create() and
4974 * security_socket_post_create() LSM hooks.
4976 * Return: Returns 0 on success or a negative error code on failure.
4978 int security_mptcp_add_subflow(struct sock *sk, struct sock *ssk)
4980 return call_int_hook(mptcp_add_subflow, sk, ssk);
4983 #endif /* CONFIG_SECURITY_NETWORK */
4985 #ifdef CONFIG_SECURITY_INFINIBAND
4987 * security_ib_pkey_access() - Check if access to an IB pkey is allowed
4989 * @subnet_prefix: subnet prefix of the port
4992 * Check permission to access a pkey when modifying a QP.
4994 * Return: Returns 0 if permission is granted.
4996 int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey)
4998 return call_int_hook(ib_pkey_access, sec, subnet_prefix, pkey);
5000 EXPORT_SYMBOL(security_ib_pkey_access);
5003 * security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
5005 * @dev_name: IB device name
5006 * @port_num: port number
5008 * Check permissions to send and receive SMPs on a end port.
5010 * Return: Returns 0 if permission is granted.
5012 int security_ib_endport_manage_subnet(void *sec,
5013 const char *dev_name, u8 port_num)
5015 return call_int_hook(ib_endport_manage_subnet, sec, dev_name, port_num);
5017 EXPORT_SYMBOL(security_ib_endport_manage_subnet);
5020 * security_ib_alloc_security() - Allocate an Infiniband LSM blob
5023 * Allocate a security structure for Infiniband objects.
5025 * Return: Returns 0 on success, non-zero on failure.
5027 int security_ib_alloc_security(void **sec)
5029 return call_int_hook(ib_alloc_security, sec);
5031 EXPORT_SYMBOL(security_ib_alloc_security);
5034 * security_ib_free_security() - Free an Infiniband LSM blob
5037 * Deallocate an Infiniband security structure.
5039 void security_ib_free_security(void *sec)
5041 call_void_hook(ib_free_security, sec);
5043 EXPORT_SYMBOL(security_ib_free_security);
5044 #endif /* CONFIG_SECURITY_INFINIBAND */
5046 #ifdef CONFIG_SECURITY_NETWORK_XFRM
5048 * security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
5049 * @ctxp: xfrm security context being added to the SPD
5050 * @sec_ctx: security label provided by userspace
5053 * Allocate a security structure to the xp->security field; the security field
5054 * is initialized to NULL when the xfrm_policy is allocated.
5056 * Return: Return 0 if operation was successful.
5058 int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
5059 struct xfrm_user_sec_ctx *sec_ctx,
5062 return call_int_hook(xfrm_policy_alloc_security, ctxp, sec_ctx, gfp);
5064 EXPORT_SYMBOL(security_xfrm_policy_alloc);
5067 * security_xfrm_policy_clone() - Clone xfrm policy LSM state
5068 * @old_ctx: xfrm security context
5069 * @new_ctxp: target xfrm security context
5071 * Allocate a security structure in new_ctxp that contains the information from
5072 * the old_ctx structure.
5074 * Return: Return 0 if operation was successful.
5076 int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
5077 struct xfrm_sec_ctx **new_ctxp)
5079 return call_int_hook(xfrm_policy_clone_security, old_ctx, new_ctxp);
5083 * security_xfrm_policy_free() - Free a xfrm security context
5084 * @ctx: xfrm security context
5086 * Free LSM resources associated with @ctx.
5088 void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
5090 call_void_hook(xfrm_policy_free_security, ctx);
5092 EXPORT_SYMBOL(security_xfrm_policy_free);
5095 * security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
5096 * @ctx: xfrm security context
5098 * Authorize deletion of a SPD entry.
5100 * Return: Returns 0 if permission is granted.
5102 int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
5104 return call_int_hook(xfrm_policy_delete_security, ctx);
5108 * security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
5109 * @x: xfrm state being added to the SAD
5110 * @sec_ctx: security label provided by userspace
5112 * Allocate a security structure to the @x->security field; the security field
5113 * is initialized to NULL when the xfrm_state is allocated. Set the context to
5114 * correspond to @sec_ctx.
5116 * Return: Return 0 if operation was successful.
5118 int security_xfrm_state_alloc(struct xfrm_state *x,
5119 struct xfrm_user_sec_ctx *sec_ctx)
5121 return call_int_hook(xfrm_state_alloc, x, sec_ctx);
5123 EXPORT_SYMBOL(security_xfrm_state_alloc);
5126 * security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
5127 * @x: xfrm state being added to the SAD
5128 * @polsec: associated policy's security context
5129 * @secid: secid from the flow
5131 * Allocate a security structure to the x->security field; the security field
5132 * is initialized to NULL when the xfrm_state is allocated. Set the context to
5133 * correspond to secid.
5135 * Return: Returns 0 if operation was successful.
5137 int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
5138 struct xfrm_sec_ctx *polsec, u32 secid)
5140 return call_int_hook(xfrm_state_alloc_acquire, x, polsec, secid);
5144 * security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
5147 * Authorize deletion of x->security.
5149 * Return: Returns 0 if permission is granted.
5151 int security_xfrm_state_delete(struct xfrm_state *x)
5153 return call_int_hook(xfrm_state_delete_security, x);
5155 EXPORT_SYMBOL(security_xfrm_state_delete);
5158 * security_xfrm_state_free() - Free a xfrm state
5161 * Deallocate x->security.
5163 void security_xfrm_state_free(struct xfrm_state *x)
5165 call_void_hook(xfrm_state_free_security, x);
5169 * security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
5170 * @ctx: target xfrm security context
5171 * @fl_secid: flow secid used to authorize access
5173 * Check permission when a flow selects a xfrm_policy for processing XFRMs on a
5174 * packet. The hook is called when selecting either a per-socket policy or a
5175 * generic xfrm policy.
5177 * Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
5180 int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
5182 return call_int_hook(xfrm_policy_lookup, ctx, fl_secid);
5186 * security_xfrm_state_pol_flow_match() - Check for a xfrm match
5187 * @x: xfrm state to match
5188 * @xp: xfrm policy to check for a match
5189 * @flic: flow to check for a match.
5191 * Check @xp and @flic for a match with @x.
5193 * Return: Returns 1 if there is a match.
5195 int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
5196 struct xfrm_policy *xp,
5197 const struct flowi_common *flic)
5199 struct security_hook_list *hp;
5200 int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match);
5203 * Since this function is expected to return 0 or 1, the judgment
5204 * becomes difficult if multiple LSMs supply this call. Fortunately,
5205 * we can use the first LSM's judgment because currently only SELinux
5206 * supplies this call.
5208 * For speed optimization, we explicitly break the loop rather than
5211 hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
5213 rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic);
5220 * security_xfrm_decode_session() - Determine the xfrm secid for a packet
5224 * Decode the packet in @skb and return the security label in @secid.
5226 * Return: Return 0 if all xfrms used have the same secid.
5228 int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
5230 return call_int_hook(xfrm_decode_session, skb, secid, 1);
5233 void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic)
5235 int rc = call_int_hook(xfrm_decode_session, skb, &flic->flowic_secid,
5240 EXPORT_SYMBOL(security_skb_classify_flow);
5241 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
5245 * security_key_alloc() - Allocate and initialize a kernel key LSM blob
5247 * @cred: credentials
5248 * @flags: allocation flags
5250 * Permit allocation of a key and assign security data. Note that key does not
5251 * have a serial number assigned at this point.
5253 * Return: Return 0 if permission is granted, -ve error otherwise.
5255 int security_key_alloc(struct key *key, const struct cred *cred,
5256 unsigned long flags)
5258 return call_int_hook(key_alloc, key, cred, flags);
5262 * security_key_free() - Free a kernel key LSM blob
5265 * Notification of destruction; free security data.
5267 void security_key_free(struct key *key)
5269 call_void_hook(key_free, key);
5273 * security_key_permission() - Check if a kernel key operation is allowed
5274 * @key_ref: key reference
5275 * @cred: credentials of actor requesting access
5276 * @need_perm: requested permissions
5278 * See whether a specific operational right is granted to a process on a key.
5280 * Return: Return 0 if permission is granted, -ve error otherwise.
5282 int security_key_permission(key_ref_t key_ref, const struct cred *cred,
5283 enum key_need_perm need_perm)
5285 return call_int_hook(key_permission, key_ref, cred, need_perm);
5289 * security_key_getsecurity() - Get the key's security label
5291 * @buffer: security label buffer
5293 * Get a textual representation of the security context attached to a key for
5294 * the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
5295 * storage for the NUL-terminated string and the caller should free it.
5297 * Return: Returns the length of @buffer (including terminating NUL) or -ve if
5298 * an error occurs. May also return 0 (and a NULL buffer pointer) if
5299 * there is no security label assigned to the key.
5301 int security_key_getsecurity(struct key *key, char **buffer)
5304 return call_int_hook(key_getsecurity, key, buffer);
5308 * security_key_post_create_or_update() - Notification of key create or update
5309 * @keyring: keyring to which the key is linked to
5310 * @key: created or updated key
5311 * @payload: data used to instantiate or update the key
5312 * @payload_len: length of payload
5314 * @create: flag indicating whether the key was created or updated
5316 * Notify the caller of a key creation or update.
5318 void security_key_post_create_or_update(struct key *keyring, struct key *key,
5319 const void *payload, size_t payload_len,
5320 unsigned long flags, bool create)
5322 call_void_hook(key_post_create_or_update, keyring, key, payload,
5323 payload_len, flags, create);
5325 #endif /* CONFIG_KEYS */
5329 * security_audit_rule_init() - Allocate and init an LSM audit rule struct
5330 * @field: audit action
5331 * @op: rule operator
5332 * @rulestr: rule context
5333 * @lsmrule: receive buffer for audit rule struct
5335 * Allocate and initialize an LSM audit rule structure.
5337 * Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
5340 int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
5342 return call_int_hook(audit_rule_init, field, op, rulestr, lsmrule);
5346 * security_audit_rule_known() - Check if an audit rule contains LSM fields
5347 * @krule: audit rule
5349 * Specifies whether given @krule contains any fields related to the current
5352 * Return: Returns 1 in case of relation found, 0 otherwise.
5354 int security_audit_rule_known(struct audit_krule *krule)
5356 return call_int_hook(audit_rule_known, krule);
5360 * security_audit_rule_free() - Free an LSM audit rule struct
5361 * @lsmrule: audit rule struct
5363 * Deallocate the LSM audit rule structure previously allocated by
5364 * audit_rule_init().
5366 void security_audit_rule_free(void *lsmrule)
5368 call_void_hook(audit_rule_free, lsmrule);
5372 * security_audit_rule_match() - Check if a label matches an audit rule
5373 * @secid: security label
5374 * @field: LSM audit field
5375 * @op: matching operator
5376 * @lsmrule: audit rule
5378 * Determine if given @secid matches a rule previously approved by
5379 * security_audit_rule_known().
5381 * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
5384 int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule)
5386 return call_int_hook(audit_rule_match, secid, field, op, lsmrule);
5388 #endif /* CONFIG_AUDIT */
5390 #ifdef CONFIG_BPF_SYSCALL
5392 * security_bpf() - Check if the bpf syscall operation is allowed
5394 * @attr: bpf attribute
5397 * Do a initial check for all bpf syscalls after the attribute is copied into
5398 * the kernel. The actual security module can implement their own rules to
5399 * check the specific cmd they need.
5401 * Return: Returns 0 if permission is granted.
5403 int security_bpf(int cmd, union bpf_attr *attr, unsigned int size)
5405 return call_int_hook(bpf, cmd, attr, size);
5409 * security_bpf_map() - Check if access to a bpf map is allowed
5413 * Do a check when the kernel generates and returns a file descriptor for eBPF
5416 * Return: Returns 0 if permission is granted.
5418 int security_bpf_map(struct bpf_map *map, fmode_t fmode)
5420 return call_int_hook(bpf_map, map, fmode);
5424 * security_bpf_prog() - Check if access to a bpf program is allowed
5425 * @prog: bpf program
5427 * Do a check when the kernel generates and returns a file descriptor for eBPF
5430 * Return: Returns 0 if permission is granted.
5432 int security_bpf_prog(struct bpf_prog *prog)
5434 return call_int_hook(bpf_prog, prog);
5438 * security_bpf_map_create() - Check if BPF map creation is allowed
5439 * @map: BPF map object
5440 * @attr: BPF syscall attributes used to create BPF map
5441 * @token: BPF token used to grant user access
5443 * Do a check when the kernel creates a new BPF map. This is also the
5444 * point where LSM blob is allocated for LSMs that need them.
5446 * Return: Returns 0 on success, error on failure.
5448 int security_bpf_map_create(struct bpf_map *map, union bpf_attr *attr,
5449 struct bpf_token *token)
5451 return call_int_hook(bpf_map_create, map, attr, token);
5455 * security_bpf_prog_load() - Check if loading of BPF program is allowed
5456 * @prog: BPF program object
5457 * @attr: BPF syscall attributes used to create BPF program
5458 * @token: BPF token used to grant user access to BPF subsystem
5460 * Perform an access control check when the kernel loads a BPF program and
5461 * allocates associated BPF program object. This hook is also responsible for
5462 * allocating any required LSM state for the BPF program.
5464 * Return: Returns 0 on success, error on failure.
5466 int security_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
5467 struct bpf_token *token)
5469 return call_int_hook(bpf_prog_load, prog, attr, token);
5473 * security_bpf_token_create() - Check if creating of BPF token is allowed
5474 * @token: BPF token object
5475 * @attr: BPF syscall attributes used to create BPF token
5476 * @path: path pointing to BPF FS mount point from which BPF token is created
5478 * Do a check when the kernel instantiates a new BPF token object from BPF FS
5479 * instance. This is also the point where LSM blob can be allocated for LSMs.
5481 * Return: Returns 0 on success, error on failure.
5483 int security_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
5486 return call_int_hook(bpf_token_create, token, attr, path);
5490 * security_bpf_token_cmd() - Check if BPF token is allowed to delegate
5491 * requested BPF syscall command
5492 * @token: BPF token object
5493 * @cmd: BPF syscall command requested to be delegated by BPF token
5495 * Do a check when the kernel decides whether provided BPF token should allow
5496 * delegation of requested BPF syscall command.
5498 * Return: Returns 0 on success, error on failure.
5500 int security_bpf_token_cmd(const struct bpf_token *token, enum bpf_cmd cmd)
5502 return call_int_hook(bpf_token_cmd, token, cmd);
5506 * security_bpf_token_capable() - Check if BPF token is allowed to delegate
5507 * requested BPF-related capability
5508 * @token: BPF token object
5509 * @cap: capabilities requested to be delegated by BPF token
5511 * Do a check when the kernel decides whether provided BPF token should allow
5512 * delegation of requested BPF-related capabilities.
5514 * Return: Returns 0 on success, error on failure.
5516 int security_bpf_token_capable(const struct bpf_token *token, int cap)
5518 return call_int_hook(bpf_token_capable, token, cap);
5522 * security_bpf_map_free() - Free a bpf map's LSM blob
5525 * Clean up the security information stored inside bpf map.
5527 void security_bpf_map_free(struct bpf_map *map)
5529 call_void_hook(bpf_map_free, map);
5533 * security_bpf_prog_free() - Free a BPF program's LSM blob
5534 * @prog: BPF program struct
5536 * Clean up the security information stored inside BPF program.
5538 void security_bpf_prog_free(struct bpf_prog *prog)
5540 call_void_hook(bpf_prog_free, prog);
5544 * security_bpf_token_free() - Free a BPF token's LSM blob
5545 * @token: BPF token struct
5547 * Clean up the security information stored inside BPF token.
5549 void security_bpf_token_free(struct bpf_token *token)
5551 call_void_hook(bpf_token_free, token);
5553 #endif /* CONFIG_BPF_SYSCALL */
5556 * security_locked_down() - Check if a kernel feature is allowed
5557 * @what: requested kernel feature
5559 * Determine whether a kernel feature that potentially enables arbitrary code
5560 * execution in kernel space should be permitted.
5562 * Return: Returns 0 if permission is granted.
5564 int security_locked_down(enum lockdown_reason what)
5566 return call_int_hook(locked_down, what);
5568 EXPORT_SYMBOL(security_locked_down);
5570 #ifdef CONFIG_PERF_EVENTS
5572 * security_perf_event_open() - Check if a perf event open is allowed
5573 * @attr: perf event attribute
5574 * @type: type of event
5576 * Check whether the @type of perf_event_open syscall is allowed.
5578 * Return: Returns 0 if permission is granted.
5580 int security_perf_event_open(struct perf_event_attr *attr, int type)
5582 return call_int_hook(perf_event_open, attr, type);
5586 * security_perf_event_alloc() - Allocate a perf event LSM blob
5587 * @event: perf event
5589 * Allocate and save perf_event security info.
5591 * Return: Returns 0 on success, error on failure.
5593 int security_perf_event_alloc(struct perf_event *event)
5595 return call_int_hook(perf_event_alloc, event);
5599 * security_perf_event_free() - Free a perf event LSM blob
5600 * @event: perf event
5602 * Release (free) perf_event security info.
5604 void security_perf_event_free(struct perf_event *event)
5606 call_void_hook(perf_event_free, event);
5610 * security_perf_event_read() - Check if reading a perf event label is allowed
5611 * @event: perf event
5613 * Read perf_event security info if allowed.
5615 * Return: Returns 0 if permission is granted.
5617 int security_perf_event_read(struct perf_event *event)
5619 return call_int_hook(perf_event_read, event);
5623 * security_perf_event_write() - Check if writing a perf event label is allowed
5624 * @event: perf event
5626 * Write perf_event security info if allowed.
5628 * Return: Returns 0 if permission is granted.
5630 int security_perf_event_write(struct perf_event *event)
5632 return call_int_hook(perf_event_write, event);
5634 #endif /* CONFIG_PERF_EVENTS */
5636 #ifdef CONFIG_IO_URING
5638 * security_uring_override_creds() - Check if overriding creds is allowed
5639 * @new: new credentials
5641 * Check if the current task, executing an io_uring operation, is allowed to
5642 * override it's credentials with @new.
5644 * Return: Returns 0 if permission is granted.
5646 int security_uring_override_creds(const struct cred *new)
5648 return call_int_hook(uring_override_creds, new);
5652 * security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
5654 * Check whether the current task is allowed to spawn a io_uring polling thread
5655 * (IORING_SETUP_SQPOLL).
5657 * Return: Returns 0 if permission is granted.
5659 int security_uring_sqpoll(void)
5661 return call_int_hook(uring_sqpoll);
5665 * security_uring_cmd() - Check if a io_uring passthrough command is allowed
5668 * Check whether the file_operations uring_cmd is allowed to run.
5670 * Return: Returns 0 if permission is granted.
5672 int security_uring_cmd(struct io_uring_cmd *ioucmd)
5674 return call_int_hook(uring_cmd, ioucmd);
5676 #endif /* CONFIG_IO_URING */