1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Security plug functions
5 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
6 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
8 * Copyright (C) 2016 Mellanox Technologies
9 * Copyright (C) 2023 Microsoft Corporation <paul@paul-moore.com>
12 #define pr_fmt(fmt) "LSM: " fmt
14 #include <linux/bpf.h>
15 #include <linux/capability.h>
16 #include <linux/dcache.h>
17 #include <linux/export.h>
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/kernel_read_file.h>
21 #include <linux/lsm_hooks.h>
22 #include <linux/integrity.h>
23 #include <linux/ima.h>
24 #include <linux/evm.h>
25 #include <linux/fsnotify.h>
26 #include <linux/mman.h>
27 #include <linux/mount.h>
28 #include <linux/personality.h>
29 #include <linux/backing-dev.h>
30 #include <linux/string.h>
31 #include <linux/msg.h>
34 /* How many LSMs were built into the kernel? */
35 #define LSM_COUNT (__end_lsm_info - __start_lsm_info)
38 * These are descriptions of the reasons that can be passed to the
39 * security_locked_down() LSM hook. Placing this array here allows
40 * all security modules to use the same descriptions for auditing
43 const char *const lockdown_reasons
[LOCKDOWN_CONFIDENTIALITY_MAX
+ 1] = {
44 [LOCKDOWN_NONE
] = "none",
45 [LOCKDOWN_MODULE_SIGNATURE
] = "unsigned module loading",
46 [LOCKDOWN_DEV_MEM
] = "/dev/mem,kmem,port",
47 [LOCKDOWN_EFI_TEST
] = "/dev/efi_test access",
48 [LOCKDOWN_KEXEC
] = "kexec of unsigned images",
49 [LOCKDOWN_HIBERNATION
] = "hibernation",
50 [LOCKDOWN_PCI_ACCESS
] = "direct PCI access",
51 [LOCKDOWN_IOPORT
] = "raw io port access",
52 [LOCKDOWN_MSR
] = "raw MSR access",
53 [LOCKDOWN_ACPI_TABLES
] = "modifying ACPI tables",
54 [LOCKDOWN_DEVICE_TREE
] = "modifying device tree contents",
55 [LOCKDOWN_PCMCIA_CIS
] = "direct PCMCIA CIS storage",
56 [LOCKDOWN_TIOCSSERIAL
] = "reconfiguration of serial port IO",
57 [LOCKDOWN_MODULE_PARAMETERS
] = "unsafe module parameters",
58 [LOCKDOWN_MMIOTRACE
] = "unsafe mmio",
59 [LOCKDOWN_DEBUGFS
] = "debugfs access",
60 [LOCKDOWN_XMON_WR
] = "xmon write access",
61 [LOCKDOWN_BPF_WRITE_USER
] = "use of bpf to write user RAM",
62 [LOCKDOWN_DBG_WRITE_KERNEL
] = "use of kgdb/kdb to write kernel RAM",
63 [LOCKDOWN_RTAS_ERROR_INJECTION
] = "RTAS error injection",
64 [LOCKDOWN_INTEGRITY_MAX
] = "integrity",
65 [LOCKDOWN_KCORE
] = "/proc/kcore access",
66 [LOCKDOWN_KPROBES
] = "use of kprobes",
67 [LOCKDOWN_BPF_READ_KERNEL
] = "use of bpf to read kernel RAM",
68 [LOCKDOWN_DBG_READ_KERNEL
] = "use of kgdb/kdb to read kernel RAM",
69 [LOCKDOWN_PERF
] = "unsafe use of perf",
70 [LOCKDOWN_TRACEFS
] = "use of tracefs",
71 [LOCKDOWN_XMON_RW
] = "xmon read and write access",
72 [LOCKDOWN_XFRM_SECRET
] = "xfrm SA secret",
73 [LOCKDOWN_CONFIDENTIALITY_MAX
] = "confidentiality",
76 struct security_hook_heads security_hook_heads __ro_after_init
;
77 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain
);
79 static struct kmem_cache
*lsm_file_cache
;
80 static struct kmem_cache
*lsm_inode_cache
;
83 static struct lsm_blob_sizes blob_sizes __ro_after_init
;
85 /* Boot-time LSM user choice */
86 static __initdata
const char *chosen_lsm_order
;
87 static __initdata
const char *chosen_major_lsm
;
89 static __initconst
const char *const builtin_lsm_order
= CONFIG_LSM
;
91 /* Ordered list of LSMs to initialize. */
92 static __initdata
struct lsm_info
**ordered_lsms
;
93 static __initdata
struct lsm_info
*exclusive
;
95 static __initdata
bool debug
;
96 #define init_debug(...) \
99 pr_info(__VA_ARGS__); \
102 static bool __init
is_enabled(struct lsm_info
*lsm
)
107 return *lsm
->enabled
;
110 /* Mark an LSM's enabled flag. */
111 static int lsm_enabled_true __initdata
= 1;
112 static int lsm_enabled_false __initdata
= 0;
113 static void __init
set_enabled(struct lsm_info
*lsm
, bool enabled
)
116 * When an LSM hasn't configured an enable variable, we can use
117 * a hard-coded location for storing the default enabled state.
121 lsm
->enabled
= &lsm_enabled_true
;
123 lsm
->enabled
= &lsm_enabled_false
;
124 } else if (lsm
->enabled
== &lsm_enabled_true
) {
126 lsm
->enabled
= &lsm_enabled_false
;
127 } else if (lsm
->enabled
== &lsm_enabled_false
) {
129 lsm
->enabled
= &lsm_enabled_true
;
131 *lsm
->enabled
= enabled
;
135 /* Is an LSM already listed in the ordered LSMs list? */
136 static bool __init
exists_ordered_lsm(struct lsm_info
*lsm
)
138 struct lsm_info
**check
;
140 for (check
= ordered_lsms
; *check
; check
++)
147 /* Append an LSM to the list of ordered LSMs to initialize. */
148 static int last_lsm __initdata
;
149 static void __init
append_ordered_lsm(struct lsm_info
*lsm
, const char *from
)
151 /* Ignore duplicate selections. */
152 if (exists_ordered_lsm(lsm
))
155 if (WARN(last_lsm
== LSM_COUNT
, "%s: out of LSM slots!?\n", from
))
158 /* Enable this LSM, if it is not already set. */
160 lsm
->enabled
= &lsm_enabled_true
;
161 ordered_lsms
[last_lsm
++] = lsm
;
163 init_debug("%s ordered: %s (%s)\n", from
, lsm
->name
,
164 is_enabled(lsm
) ? "enabled" : "disabled");
167 /* Is an LSM allowed to be initialized? */
168 static bool __init
lsm_allowed(struct lsm_info
*lsm
)
170 /* Skip if the LSM is disabled. */
171 if (!is_enabled(lsm
))
174 /* Not allowed if another exclusive LSM already initialized. */
175 if ((lsm
->flags
& LSM_FLAG_EXCLUSIVE
) && exclusive
) {
176 init_debug("exclusive disabled: %s\n", lsm
->name
);
183 static void __init
lsm_set_blob_size(int *need
, int *lbs
)
190 offset
= ALIGN(*lbs
, sizeof(void *));
191 *lbs
= offset
+ *need
;
195 static void __init
lsm_set_blob_sizes(struct lsm_blob_sizes
*needed
)
200 lsm_set_blob_size(&needed
->lbs_cred
, &blob_sizes
.lbs_cred
);
201 lsm_set_blob_size(&needed
->lbs_file
, &blob_sizes
.lbs_file
);
203 * The inode blob gets an rcu_head in addition to
204 * what the modules might need.
206 if (needed
->lbs_inode
&& blob_sizes
.lbs_inode
== 0)
207 blob_sizes
.lbs_inode
= sizeof(struct rcu_head
);
208 lsm_set_blob_size(&needed
->lbs_inode
, &blob_sizes
.lbs_inode
);
209 lsm_set_blob_size(&needed
->lbs_ipc
, &blob_sizes
.lbs_ipc
);
210 lsm_set_blob_size(&needed
->lbs_msg_msg
, &blob_sizes
.lbs_msg_msg
);
211 lsm_set_blob_size(&needed
->lbs_superblock
, &blob_sizes
.lbs_superblock
);
212 lsm_set_blob_size(&needed
->lbs_task
, &blob_sizes
.lbs_task
);
213 lsm_set_blob_size(&needed
->lbs_xattr_count
,
214 &blob_sizes
.lbs_xattr_count
);
217 /* Prepare LSM for initialization. */
218 static void __init
prepare_lsm(struct lsm_info
*lsm
)
220 int enabled
= lsm_allowed(lsm
);
222 /* Record enablement (to handle any following exclusive LSMs). */
223 set_enabled(lsm
, enabled
);
225 /* If enabled, do pre-initialization work. */
227 if ((lsm
->flags
& LSM_FLAG_EXCLUSIVE
) && !exclusive
) {
229 init_debug("exclusive chosen: %s\n", lsm
->name
);
232 lsm_set_blob_sizes(lsm
->blobs
);
236 /* Initialize a given LSM, if it is enabled. */
237 static void __init
initialize_lsm(struct lsm_info
*lsm
)
239 if (is_enabled(lsm
)) {
242 init_debug("initializing %s\n", lsm
->name
);
244 WARN(ret
, "%s failed to initialize: %d\n", lsm
->name
, ret
);
248 /* Populate ordered LSMs list from comma-separated LSM name list. */
249 static void __init
ordered_lsm_parse(const char *order
, const char *origin
)
251 struct lsm_info
*lsm
;
252 char *sep
, *name
, *next
;
254 /* LSM_ORDER_FIRST is always first. */
255 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
256 if (lsm
->order
== LSM_ORDER_FIRST
)
257 append_ordered_lsm(lsm
, " first");
260 /* Process "security=", if given. */
261 if (chosen_major_lsm
) {
262 struct lsm_info
*major
;
265 * To match the original "security=" behavior, this
266 * explicitly does NOT fallback to another Legacy Major
267 * if the selected one was separately disabled: disable
268 * all non-matching Legacy Major LSMs.
270 for (major
= __start_lsm_info
; major
< __end_lsm_info
;
272 if ((major
->flags
& LSM_FLAG_LEGACY_MAJOR
) &&
273 strcmp(major
->name
, chosen_major_lsm
) != 0) {
274 set_enabled(major
, false);
275 init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
276 chosen_major_lsm
, major
->name
);
281 sep
= kstrdup(order
, GFP_KERNEL
);
283 /* Walk the list, looking for matching LSMs. */
284 while ((name
= strsep(&next
, ",")) != NULL
) {
287 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
288 if (strcmp(lsm
->name
, name
) == 0) {
289 if (lsm
->order
== LSM_ORDER_MUTABLE
)
290 append_ordered_lsm(lsm
, origin
);
296 init_debug("%s ignored: %s (not built into kernel)\n",
300 /* Process "security=", if given. */
301 if (chosen_major_lsm
) {
302 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
303 if (exists_ordered_lsm(lsm
))
305 if (strcmp(lsm
->name
, chosen_major_lsm
) == 0)
306 append_ordered_lsm(lsm
, "security=");
310 /* LSM_ORDER_LAST is always last. */
311 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
312 if (lsm
->order
== LSM_ORDER_LAST
)
313 append_ordered_lsm(lsm
, " last");
316 /* Disable all LSMs not in the ordered list. */
317 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
318 if (exists_ordered_lsm(lsm
))
320 set_enabled(lsm
, false);
321 init_debug("%s skipped: %s (not in requested order)\n",
328 static void __init
lsm_early_cred(struct cred
*cred
);
329 static void __init
lsm_early_task(struct task_struct
*task
);
331 static int lsm_append(const char *new, char **result
);
333 static void __init
report_lsm_order(void)
335 struct lsm_info
**lsm
, *early
;
338 pr_info("initializing lsm=");
340 /* Report each enabled LSM name, comma separated. */
341 for (early
= __start_early_lsm_info
;
342 early
< __end_early_lsm_info
; early
++)
343 if (is_enabled(early
))
344 pr_cont("%s%s", first
++ == 0 ? "" : ",", early
->name
);
345 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
346 if (is_enabled(*lsm
))
347 pr_cont("%s%s", first
++ == 0 ? "" : ",", (*lsm
)->name
);
352 static void __init
ordered_lsm_init(void)
354 struct lsm_info
**lsm
;
356 ordered_lsms
= kcalloc(LSM_COUNT
+ 1, sizeof(*ordered_lsms
),
359 if (chosen_lsm_order
) {
360 if (chosen_major_lsm
) {
361 pr_warn("security=%s is ignored because it is superseded by lsm=%s\n",
362 chosen_major_lsm
, chosen_lsm_order
);
363 chosen_major_lsm
= NULL
;
365 ordered_lsm_parse(chosen_lsm_order
, "cmdline");
367 ordered_lsm_parse(builtin_lsm_order
, "builtin");
369 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
374 init_debug("cred blob size = %d\n", blob_sizes
.lbs_cred
);
375 init_debug("file blob size = %d\n", blob_sizes
.lbs_file
);
376 init_debug("inode blob size = %d\n", blob_sizes
.lbs_inode
);
377 init_debug("ipc blob size = %d\n", blob_sizes
.lbs_ipc
);
378 init_debug("msg_msg blob size = %d\n", blob_sizes
.lbs_msg_msg
);
379 init_debug("superblock blob size = %d\n", blob_sizes
.lbs_superblock
);
380 init_debug("task blob size = %d\n", blob_sizes
.lbs_task
);
381 init_debug("xattr slots = %d\n", blob_sizes
.lbs_xattr_count
);
384 * Create any kmem_caches needed for blobs
386 if (blob_sizes
.lbs_file
)
387 lsm_file_cache
= kmem_cache_create("lsm_file_cache",
388 blob_sizes
.lbs_file
, 0,
390 if (blob_sizes
.lbs_inode
)
391 lsm_inode_cache
= kmem_cache_create("lsm_inode_cache",
392 blob_sizes
.lbs_inode
, 0,
395 lsm_early_cred((struct cred
*) current
->cred
);
396 lsm_early_task(current
);
397 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
398 initialize_lsm(*lsm
);
403 int __init
early_security_init(void)
405 struct lsm_info
*lsm
;
407 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
408 INIT_HLIST_HEAD(&security_hook_heads.NAME);
409 #include "linux/lsm_hook_defs.h"
412 for (lsm
= __start_early_lsm_info
; lsm
< __end_early_lsm_info
; lsm
++) {
414 lsm
->enabled
= &lsm_enabled_true
;
423 * security_init - initializes the security framework
425 * This should be called early in the kernel initialization sequence.
427 int __init
security_init(void)
429 struct lsm_info
*lsm
;
431 init_debug("legacy security=%s\n", chosen_major_lsm
? : " *unspecified*");
432 init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order
);
433 init_debug("boot arg lsm=%s\n", chosen_lsm_order
? : " *unspecified*");
436 * Append the names of the early LSM modules now that kmalloc() is
439 for (lsm
= __start_early_lsm_info
; lsm
< __end_early_lsm_info
; lsm
++) {
440 init_debug(" early started: %s (%s)\n", lsm
->name
,
441 is_enabled(lsm
) ? "enabled" : "disabled");
443 lsm_append(lsm
->name
, &lsm_names
);
446 /* Load LSMs in specified order. */
452 /* Save user chosen LSM */
453 static int __init
choose_major_lsm(char *str
)
455 chosen_major_lsm
= str
;
458 __setup("security=", choose_major_lsm
);
460 /* Explicitly choose LSM initialization order. */
461 static int __init
choose_lsm_order(char *str
)
463 chosen_lsm_order
= str
;
466 __setup("lsm=", choose_lsm_order
);
468 /* Enable LSM order debugging. */
469 static int __init
enable_debug(char *str
)
474 __setup("lsm.debug", enable_debug
);
476 static bool match_last_lsm(const char *list
, const char *lsm
)
480 if (WARN_ON(!list
|| !lsm
))
482 last
= strrchr(list
, ',');
484 /* Pass the comma, strcmp() will check for '\0' */
488 return !strcmp(last
, lsm
);
491 static int lsm_append(const char *new, char **result
)
495 if (*result
== NULL
) {
496 *result
= kstrdup(new, GFP_KERNEL
);
500 /* Check if it is the last registered name */
501 if (match_last_lsm(*result
, new))
503 cp
= kasprintf(GFP_KERNEL
, "%s,%s", *result
, new);
513 * security_add_hooks - Add a modules hooks to the hook lists.
514 * @hooks: the hooks to add
515 * @count: the number of hooks to add
516 * @lsm: the name of the security module
518 * Each LSM has to register its hooks with the infrastructure.
520 void __init
security_add_hooks(struct security_hook_list
*hooks
, int count
,
525 for (i
= 0; i
< count
; i
++) {
527 hlist_add_tail_rcu(&hooks
[i
].list
, hooks
[i
].head
);
531 * Don't try to append during early_security_init(), we'll come back
532 * and fix this up afterwards.
534 if (slab_is_available()) {
535 if (lsm_append(lsm
, &lsm_names
) < 0)
536 panic("%s - Cannot get early memory.\n", __func__
);
540 int call_blocking_lsm_notifier(enum lsm_event event
, void *data
)
542 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain
,
545 EXPORT_SYMBOL(call_blocking_lsm_notifier
);
547 int register_blocking_lsm_notifier(struct notifier_block
*nb
)
549 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain
,
552 EXPORT_SYMBOL(register_blocking_lsm_notifier
);
554 int unregister_blocking_lsm_notifier(struct notifier_block
*nb
)
556 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain
,
559 EXPORT_SYMBOL(unregister_blocking_lsm_notifier
);
562 * lsm_cred_alloc - allocate a composite cred blob
563 * @cred: the cred that needs a blob
564 * @gfp: allocation type
566 * Allocate the cred blob for all the modules
568 * Returns 0, or -ENOMEM if memory can't be allocated.
570 static int lsm_cred_alloc(struct cred
*cred
, gfp_t gfp
)
572 if (blob_sizes
.lbs_cred
== 0) {
573 cred
->security
= NULL
;
577 cred
->security
= kzalloc(blob_sizes
.lbs_cred
, gfp
);
578 if (cred
->security
== NULL
)
584 * lsm_early_cred - during initialization allocate a composite cred blob
585 * @cred: the cred that needs a blob
587 * Allocate the cred blob for all the modules
589 static void __init
lsm_early_cred(struct cred
*cred
)
591 int rc
= lsm_cred_alloc(cred
, GFP_KERNEL
);
594 panic("%s: Early cred alloc failed.\n", __func__
);
598 * lsm_file_alloc - allocate a composite file blob
599 * @file: the file that needs a blob
601 * Allocate the file blob for all the modules
603 * Returns 0, or -ENOMEM if memory can't be allocated.
605 static int lsm_file_alloc(struct file
*file
)
607 if (!lsm_file_cache
) {
608 file
->f_security
= NULL
;
612 file
->f_security
= kmem_cache_zalloc(lsm_file_cache
, GFP_KERNEL
);
613 if (file
->f_security
== NULL
)
619 * lsm_inode_alloc - allocate a composite inode blob
620 * @inode: the inode that needs a blob
622 * Allocate the inode blob for all the modules
624 * Returns 0, or -ENOMEM if memory can't be allocated.
626 int lsm_inode_alloc(struct inode
*inode
)
628 if (!lsm_inode_cache
) {
629 inode
->i_security
= NULL
;
633 inode
->i_security
= kmem_cache_zalloc(lsm_inode_cache
, GFP_NOFS
);
634 if (inode
->i_security
== NULL
)
640 * lsm_task_alloc - allocate a composite task blob
641 * @task: the task that needs a blob
643 * Allocate the task blob for all the modules
645 * Returns 0, or -ENOMEM if memory can't be allocated.
647 static int lsm_task_alloc(struct task_struct
*task
)
649 if (blob_sizes
.lbs_task
== 0) {
650 task
->security
= NULL
;
654 task
->security
= kzalloc(blob_sizes
.lbs_task
, GFP_KERNEL
);
655 if (task
->security
== NULL
)
661 * lsm_ipc_alloc - allocate a composite ipc blob
662 * @kip: the ipc that needs a blob
664 * Allocate the ipc blob for all the modules
666 * Returns 0, or -ENOMEM if memory can't be allocated.
668 static int lsm_ipc_alloc(struct kern_ipc_perm
*kip
)
670 if (blob_sizes
.lbs_ipc
== 0) {
671 kip
->security
= NULL
;
675 kip
->security
= kzalloc(blob_sizes
.lbs_ipc
, GFP_KERNEL
);
676 if (kip
->security
== NULL
)
682 * lsm_msg_msg_alloc - allocate a composite msg_msg blob
683 * @mp: the msg_msg that needs a blob
685 * Allocate the ipc blob for all the modules
687 * Returns 0, or -ENOMEM if memory can't be allocated.
689 static int lsm_msg_msg_alloc(struct msg_msg
*mp
)
691 if (blob_sizes
.lbs_msg_msg
== 0) {
696 mp
->security
= kzalloc(blob_sizes
.lbs_msg_msg
, GFP_KERNEL
);
697 if (mp
->security
== NULL
)
703 * lsm_early_task - during initialization allocate a composite task blob
704 * @task: the task that needs a blob
706 * Allocate the task blob for all the modules
708 static void __init
lsm_early_task(struct task_struct
*task
)
710 int rc
= lsm_task_alloc(task
);
713 panic("%s: Early task alloc failed.\n", __func__
);
717 * lsm_superblock_alloc - allocate a composite superblock blob
718 * @sb: the superblock that needs a blob
720 * Allocate the superblock blob for all the modules
722 * Returns 0, or -ENOMEM if memory can't be allocated.
724 static int lsm_superblock_alloc(struct super_block
*sb
)
726 if (blob_sizes
.lbs_superblock
== 0) {
727 sb
->s_security
= NULL
;
731 sb
->s_security
= kzalloc(blob_sizes
.lbs_superblock
, GFP_KERNEL
);
732 if (sb
->s_security
== NULL
)
738 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
739 * can be accessed with:
741 * LSM_RET_DEFAULT(<hook_name>)
743 * The macros below define static constants for the default value of each
746 #define LSM_RET_DEFAULT(NAME) (NAME##_default)
747 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
748 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
749 static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
750 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
751 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
753 #include <linux/lsm_hook_defs.h>
757 * Hook list operation macros.
760 * This is a hook that does not return a value.
763 * This is a hook that returns a value.
766 #define call_void_hook(FUNC, ...) \
768 struct security_hook_list *P; \
770 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
771 P->hook.FUNC(__VA_ARGS__); \
774 #define call_int_hook(FUNC, IRC, ...) ({ \
777 struct security_hook_list *P; \
779 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
780 RC = P->hook.FUNC(__VA_ARGS__); \
788 /* Security operations */
791 * security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
792 * @mgr: task credentials of current binder process
794 * Check whether @mgr is allowed to be the binder context manager.
796 * Return: Return 0 if permission is granted.
798 int security_binder_set_context_mgr(const struct cred
*mgr
)
800 return call_int_hook(binder_set_context_mgr
, 0, mgr
);
804 * security_binder_transaction() - Check if a binder transaction is allowed
805 * @from: sending process
806 * @to: receiving process
808 * Check whether @from is allowed to invoke a binder transaction call to @to.
810 * Return: Returns 0 if permission is granted.
812 int security_binder_transaction(const struct cred
*from
,
813 const struct cred
*to
)
815 return call_int_hook(binder_transaction
, 0, from
, to
);
819 * security_binder_transfer_binder() - Check if a binder transfer is allowed
820 * @from: sending process
821 * @to: receiving process
823 * Check whether @from is allowed to transfer a binder reference to @to.
825 * Return: Returns 0 if permission is granted.
827 int security_binder_transfer_binder(const struct cred
*from
,
828 const struct cred
*to
)
830 return call_int_hook(binder_transfer_binder
, 0, from
, to
);
834 * security_binder_transfer_file() - Check if a binder file xfer is allowed
835 * @from: sending process
836 * @to: receiving process
837 * @file: file being transferred
839 * Check whether @from is allowed to transfer @file to @to.
841 * Return: Returns 0 if permission is granted.
843 int security_binder_transfer_file(const struct cred
*from
,
844 const struct cred
*to
, const struct file
*file
)
846 return call_int_hook(binder_transfer_file
, 0, from
, to
, file
);
850 * security_ptrace_access_check() - Check if tracing is allowed
851 * @child: target process
852 * @mode: PTRACE_MODE flags
854 * Check permission before allowing the current process to trace the @child
855 * process. Security modules may also want to perform a process tracing check
856 * during an execve in the set_security or apply_creds hooks of tracing check
857 * during an execve in the bprm_set_creds hook of binprm_security_ops if the
858 * process is being traced and its security attributes would be changed by the
861 * Return: Returns 0 if permission is granted.
863 int security_ptrace_access_check(struct task_struct
*child
, unsigned int mode
)
865 return call_int_hook(ptrace_access_check
, 0, child
, mode
);
869 * security_ptrace_traceme() - Check if tracing is allowed
870 * @parent: tracing process
872 * Check that the @parent process has sufficient permission to trace the
873 * current process before allowing the current process to present itself to the
874 * @parent process for tracing.
876 * Return: Returns 0 if permission is granted.
878 int security_ptrace_traceme(struct task_struct
*parent
)
880 return call_int_hook(ptrace_traceme
, 0, parent
);
884 * security_capget() - Get the capability sets for a process
885 * @target: target process
886 * @effective: effective capability set
887 * @inheritable: inheritable capability set
888 * @permitted: permitted capability set
890 * Get the @effective, @inheritable, and @permitted capability sets for the
891 * @target process. The hook may also perform permission checking to determine
892 * if the current process is allowed to see the capability sets of the @target
895 * Return: Returns 0 if the capability sets were successfully obtained.
897 int security_capget(const struct task_struct
*target
,
898 kernel_cap_t
*effective
,
899 kernel_cap_t
*inheritable
,
900 kernel_cap_t
*permitted
)
902 return call_int_hook(capget
, 0, target
,
903 effective
, inheritable
, permitted
);
907 * security_capset() - Set the capability sets for a process
908 * @new: new credentials for the target process
909 * @old: current credentials of the target process
910 * @effective: effective capability set
911 * @inheritable: inheritable capability set
912 * @permitted: permitted capability set
914 * Set the @effective, @inheritable, and @permitted capability sets for the
917 * Return: Returns 0 and update @new if permission is granted.
919 int security_capset(struct cred
*new, const struct cred
*old
,
920 const kernel_cap_t
*effective
,
921 const kernel_cap_t
*inheritable
,
922 const kernel_cap_t
*permitted
)
924 return call_int_hook(capset
, 0, new, old
,
925 effective
, inheritable
, permitted
);
929 * security_capable() - Check if a process has the necessary capability
930 * @cred: credentials to examine
931 * @ns: user namespace
932 * @cap: capability requested
933 * @opts: capability check options
935 * Check whether the @tsk process has the @cap capability in the indicated
936 * credentials. @cap contains the capability <include/linux/capability.h>.
937 * @opts contains options for the capable check <include/linux/security.h>.
939 * Return: Returns 0 if the capability is granted.
941 int security_capable(const struct cred
*cred
,
942 struct user_namespace
*ns
,
946 return call_int_hook(capable
, 0, cred
, ns
, cap
, opts
);
950 * security_quotactl() - Check if a quotactl() syscall is allowed for this fs
956 * Check whether the quotactl syscall is allowed for this @sb.
958 * Return: Returns 0 if permission is granted.
960 int security_quotactl(int cmds
, int type
, int id
, const struct super_block
*sb
)
962 return call_int_hook(quotactl
, 0, cmds
, type
, id
, sb
);
966 * security_quota_on() - Check if QUOTAON is allowed for a dentry
969 * Check whether QUOTAON is allowed for @dentry.
971 * Return: Returns 0 if permission is granted.
973 int security_quota_on(struct dentry
*dentry
)
975 return call_int_hook(quota_on
, 0, dentry
);
979 * security_syslog() - Check if accessing the kernel message ring is allowed
980 * @type: SYSLOG_ACTION_* type
982 * Check permission before accessing the kernel message ring or changing
983 * logging to the console. See the syslog(2) manual page for an explanation of
986 * Return: Return 0 if permission is granted.
988 int security_syslog(int type
)
990 return call_int_hook(syslog
, 0, type
);
994 * security_settime64() - Check if changing the system time is allowed
998 * Check permission to change the system time, struct timespec64 is defined in
999 * <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
1001 * Return: Returns 0 if permission is granted.
1003 int security_settime64(const struct timespec64
*ts
, const struct timezone
*tz
)
1005 return call_int_hook(settime
, 0, ts
, tz
);
1009 * security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
1011 * @pages: number of pages
1013 * Check permissions for allocating a new virtual mapping. If all LSMs return
1014 * a positive value, __vm_enough_memory() will be called with cap_sys_admin
1015 * set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
1016 * called with cap_sys_admin cleared.
1018 * Return: Returns 0 if permission is granted by the LSM infrastructure to the
1021 int security_vm_enough_memory_mm(struct mm_struct
*mm
, long pages
)
1023 struct security_hook_list
*hp
;
1024 int cap_sys_admin
= 1;
1028 * The module will respond with a positive value if
1029 * it thinks the __vm_enough_memory() call should be
1030 * made with the cap_sys_admin set. If all of the modules
1031 * agree that it should be set it will. If any module
1032 * thinks it should not be set it won't.
1034 hlist_for_each_entry(hp
, &security_hook_heads
.vm_enough_memory
, list
) {
1035 rc
= hp
->hook
.vm_enough_memory(mm
, pages
);
1041 return __vm_enough_memory(mm
, pages
, cap_sys_admin
);
1045 * security_bprm_creds_for_exec() - Prepare the credentials for exec()
1046 * @bprm: binary program information
1048 * If the setup in prepare_exec_creds did not setup @bprm->cred->security
1049 * properly for executing @bprm->file, update the LSM's portion of
1050 * @bprm->cred->security to be what commit_creds needs to install for the new
1051 * program. This hook may also optionally check permissions (e.g. for
1052 * transitions between security domains). The hook must set @bprm->secureexec
1053 * to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
1054 * contains the linux_binprm structure.
1056 * Return: Returns 0 if the hook is successful and permission is granted.
1058 int security_bprm_creds_for_exec(struct linux_binprm
*bprm
)
1060 return call_int_hook(bprm_creds_for_exec
, 0, bprm
);
1064 * security_bprm_creds_from_file() - Update linux_binprm creds based on file
1065 * @bprm: binary program information
1066 * @file: associated file
1068 * If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
1069 * exec, update @bprm->cred to reflect that change. This is called after
1070 * finding the binary that will be executed without an interpreter. This
1071 * ensures that the credentials will not be derived from a script that the
1072 * binary will need to reopen, which when reopend may end up being a completely
1073 * different file. This hook may also optionally check permissions (e.g. for
1074 * transitions between security domains). The hook must set @bprm->secureexec
1075 * to 1 if AT_SECURE should be set to request libc enable secure mode. The
1076 * hook must add to @bprm->per_clear any personality flags that should be
1077 * cleared from current->personality. @bprm contains the linux_binprm
1080 * Return: Returns 0 if the hook is successful and permission is granted.
1082 int security_bprm_creds_from_file(struct linux_binprm
*bprm
, const struct file
*file
)
1084 return call_int_hook(bprm_creds_from_file
, 0, bprm
, file
);
1088 * security_bprm_check() - Mediate binary handler search
1089 * @bprm: binary program information
1091 * This hook mediates the point when a search for a binary handler will begin.
1092 * It allows a check against the @bprm->cred->security value which was set in
1093 * the preceding creds_for_exec call. The argv list and envp list are reliably
1094 * available in @bprm. This hook may be called multiple times during a single
1095 * execve. @bprm contains the linux_binprm structure.
1097 * Return: Returns 0 if the hook is successful and permission is granted.
1099 int security_bprm_check(struct linux_binprm
*bprm
)
1103 ret
= call_int_hook(bprm_check_security
, 0, bprm
);
1106 return ima_bprm_check(bprm
);
1110 * security_bprm_committing_creds() - Install creds for a process during exec()
1111 * @bprm: binary program information
1113 * Prepare to install the new security attributes of a process being
1114 * transformed by an execve operation, based on the old credentials pointed to
1115 * by @current->cred and the information set in @bprm->cred by the
1116 * bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
1117 * hook is a good place to perform state changes on the process such as closing
1118 * open file descriptors to which access will no longer be granted when the
1119 * attributes are changed. This is called immediately before commit_creds().
1121 void security_bprm_committing_creds(const struct linux_binprm
*bprm
)
1123 call_void_hook(bprm_committing_creds
, bprm
);
1127 * security_bprm_committed_creds() - Tidy up after cred install during exec()
1128 * @bprm: binary program information
1130 * Tidy up after the installation of the new security attributes of a process
1131 * being transformed by an execve operation. The new credentials have, by this
1132 * point, been set to @current->cred. @bprm points to the linux_binprm
1133 * structure. This hook is a good place to perform state changes on the
1134 * process such as clearing out non-inheritable signal state. This is called
1135 * immediately after commit_creds().
1137 void security_bprm_committed_creds(const struct linux_binprm
*bprm
)
1139 call_void_hook(bprm_committed_creds
, bprm
);
1143 * security_fs_context_submount() - Initialise fc->security
1144 * @fc: new filesystem context
1145 * @reference: dentry reference for submount/remount
1147 * Fill out the ->security field for a new fs_context.
1149 * Return: Returns 0 on success or negative error code on failure.
1151 int security_fs_context_submount(struct fs_context
*fc
, struct super_block
*reference
)
1153 return call_int_hook(fs_context_submount
, 0, fc
, reference
);
1157 * security_fs_context_dup() - Duplicate a fs_context LSM blob
1158 * @fc: destination filesystem context
1159 * @src_fc: source filesystem context
1161 * Allocate and attach a security structure to sc->security. This pointer is
1162 * initialised to NULL by the caller. @fc indicates the new filesystem context.
1163 * @src_fc indicates the original filesystem context.
1165 * Return: Returns 0 on success or a negative error code on failure.
1167 int security_fs_context_dup(struct fs_context
*fc
, struct fs_context
*src_fc
)
1169 return call_int_hook(fs_context_dup
, 0, fc
, src_fc
);
1173 * security_fs_context_parse_param() - Configure a filesystem context
1174 * @fc: filesystem context
1175 * @param: filesystem parameter
1177 * Userspace provided a parameter to configure a superblock. The LSM can
1178 * consume the parameter or return it to the caller for use elsewhere.
1180 * Return: If the parameter is used by the LSM it should return 0, if it is
1181 * returned to the caller -ENOPARAM is returned, otherwise a negative
1182 * error code is returned.
1184 int security_fs_context_parse_param(struct fs_context
*fc
,
1185 struct fs_parameter
*param
)
1187 struct security_hook_list
*hp
;
1191 hlist_for_each_entry(hp
, &security_hook_heads
.fs_context_parse_param
,
1193 trc
= hp
->hook
.fs_context_parse_param(fc
, param
);
1196 else if (trc
!= -ENOPARAM
)
1203 * security_sb_alloc() - Allocate a super_block LSM blob
1204 * @sb: filesystem superblock
1206 * Allocate and attach a security structure to the sb->s_security field. The
1207 * s_security field is initialized to NULL when the structure is allocated.
1208 * @sb contains the super_block structure to be modified.
1210 * Return: Returns 0 if operation was successful.
1212 int security_sb_alloc(struct super_block
*sb
)
1214 int rc
= lsm_superblock_alloc(sb
);
1218 rc
= call_int_hook(sb_alloc_security
, 0, sb
);
1220 security_sb_free(sb
);
1225 * security_sb_delete() - Release super_block LSM associated objects
1226 * @sb: filesystem superblock
1228 * Release objects tied to a superblock (e.g. inodes). @sb contains the
1229 * super_block structure being released.
1231 void security_sb_delete(struct super_block
*sb
)
1233 call_void_hook(sb_delete
, sb
);
1237 * security_sb_free() - Free a super_block LSM blob
1238 * @sb: filesystem superblock
1240 * Deallocate and clear the sb->s_security field. @sb contains the super_block
1241 * structure to be modified.
1243 void security_sb_free(struct super_block
*sb
)
1245 call_void_hook(sb_free_security
, sb
);
1246 kfree(sb
->s_security
);
1247 sb
->s_security
= NULL
;
1251 * security_free_mnt_opts() - Free memory associated with mount options
1252 * @mnt_opts: LSM processed mount options
1254 * Free memory associated with @mnt_ops.
1256 void security_free_mnt_opts(void **mnt_opts
)
1260 call_void_hook(sb_free_mnt_opts
, *mnt_opts
);
1263 EXPORT_SYMBOL(security_free_mnt_opts
);
1266 * security_sb_eat_lsm_opts() - Consume LSM mount options
1267 * @options: mount options
1268 * @mnt_opts: LSM processed mount options
1270 * Eat (scan @options) and save them in @mnt_opts.
1272 * Return: Returns 0 on success, negative values on failure.
1274 int security_sb_eat_lsm_opts(char *options
, void **mnt_opts
)
1276 return call_int_hook(sb_eat_lsm_opts
, 0, options
, mnt_opts
);
1278 EXPORT_SYMBOL(security_sb_eat_lsm_opts
);
1281 * security_sb_mnt_opts_compat() - Check if new mount options are allowed
1282 * @sb: filesystem superblock
1283 * @mnt_opts: new mount options
1285 * Determine if the new mount options in @mnt_opts are allowed given the
1286 * existing mounted filesystem at @sb. @sb superblock being compared.
1288 * Return: Returns 0 if options are compatible.
1290 int security_sb_mnt_opts_compat(struct super_block
*sb
,
1293 return call_int_hook(sb_mnt_opts_compat
, 0, sb
, mnt_opts
);
1295 EXPORT_SYMBOL(security_sb_mnt_opts_compat
);
1298 * security_sb_remount() - Verify no incompatible mount changes during remount
1299 * @sb: filesystem superblock
1300 * @mnt_opts: (re)mount options
1302 * Extracts security system specific mount options and verifies no changes are
1303 * being made to those options.
1305 * Return: Returns 0 if permission is granted.
1307 int security_sb_remount(struct super_block
*sb
,
1310 return call_int_hook(sb_remount
, 0, sb
, mnt_opts
);
1312 EXPORT_SYMBOL(security_sb_remount
);
1315 * security_sb_kern_mount() - Check if a kernel mount is allowed
1316 * @sb: filesystem superblock
1318 * Mount this @sb if allowed by permissions.
1320 * Return: Returns 0 if permission is granted.
1322 int security_sb_kern_mount(const struct super_block
*sb
)
1324 return call_int_hook(sb_kern_mount
, 0, sb
);
1328 * security_sb_show_options() - Output the mount options for a superblock
1330 * @sb: filesystem superblock
1332 * Show (print on @m) mount options for this @sb.
1334 * Return: Returns 0 on success, negative values on failure.
1336 int security_sb_show_options(struct seq_file
*m
, struct super_block
*sb
)
1338 return call_int_hook(sb_show_options
, 0, m
, sb
);
1342 * security_sb_statfs() - Check if accessing fs stats is allowed
1343 * @dentry: superblock handle
1345 * Check permission before obtaining filesystem statistics for the @mnt
1346 * mountpoint. @dentry is a handle on the superblock for the filesystem.
1348 * Return: Returns 0 if permission is granted.
1350 int security_sb_statfs(struct dentry
*dentry
)
1352 return call_int_hook(sb_statfs
, 0, dentry
);
1356 * security_sb_mount() - Check permission for mounting a filesystem
1357 * @dev_name: filesystem backing device
1358 * @path: mount point
1359 * @type: filesystem type
1360 * @flags: mount flags
1361 * @data: filesystem specific data
1363 * Check permission before an object specified by @dev_name is mounted on the
1364 * mount point named by @nd. For an ordinary mount, @dev_name identifies a
1365 * device if the file system type requires a device. For a remount
1366 * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
1367 * (@flags & MS_BIND), @dev_name identifies the pathname of the object being
1370 * Return: Returns 0 if permission is granted.
1372 int security_sb_mount(const char *dev_name
, const struct path
*path
,
1373 const char *type
, unsigned long flags
, void *data
)
1375 return call_int_hook(sb_mount
, 0, dev_name
, path
, type
, flags
, data
);
1379 * security_sb_umount() - Check permission for unmounting a filesystem
1380 * @mnt: mounted filesystem
1381 * @flags: unmount flags
1383 * Check permission before the @mnt file system is unmounted.
1385 * Return: Returns 0 if permission is granted.
1387 int security_sb_umount(struct vfsmount
*mnt
, int flags
)
1389 return call_int_hook(sb_umount
, 0, mnt
, flags
);
1393 * security_sb_pivotroot() - Check permissions for pivoting the rootfs
1394 * @old_path: new location for current rootfs
1395 * @new_path: location of the new rootfs
1397 * Check permission before pivoting the root filesystem.
1399 * Return: Returns 0 if permission is granted.
1401 int security_sb_pivotroot(const struct path
*old_path
,
1402 const struct path
*new_path
)
1404 return call_int_hook(sb_pivotroot
, 0, old_path
, new_path
);
1408 * security_sb_set_mnt_opts() - Set the mount options for a filesystem
1409 * @sb: filesystem superblock
1410 * @mnt_opts: binary mount options
1411 * @kern_flags: kernel flags (in)
1412 * @set_kern_flags: kernel flags (out)
1414 * Set the security relevant mount options used for a superblock.
1416 * Return: Returns 0 on success, error on failure.
1418 int security_sb_set_mnt_opts(struct super_block
*sb
,
1420 unsigned long kern_flags
,
1421 unsigned long *set_kern_flags
)
1423 return call_int_hook(sb_set_mnt_opts
,
1424 mnt_opts
? -EOPNOTSUPP
: 0, sb
,
1425 mnt_opts
, kern_flags
, set_kern_flags
);
1427 EXPORT_SYMBOL(security_sb_set_mnt_opts
);
1430 * security_sb_clone_mnt_opts() - Duplicate superblock mount options
1431 * @oldsb: source superblock
1432 * @newsb: destination superblock
1433 * @kern_flags: kernel flags (in)
1434 * @set_kern_flags: kernel flags (out)
1436 * Copy all security options from a given superblock to another.
1438 * Return: Returns 0 on success, error on failure.
1440 int security_sb_clone_mnt_opts(const struct super_block
*oldsb
,
1441 struct super_block
*newsb
,
1442 unsigned long kern_flags
,
1443 unsigned long *set_kern_flags
)
1445 return call_int_hook(sb_clone_mnt_opts
, 0, oldsb
, newsb
,
1446 kern_flags
, set_kern_flags
);
1448 EXPORT_SYMBOL(security_sb_clone_mnt_opts
);
1451 * security_move_mount() - Check permissions for moving a mount
1452 * @from_path: source mount point
1453 * @to_path: destination mount point
1455 * Check permission before a mount is moved.
1457 * Return: Returns 0 if permission is granted.
1459 int security_move_mount(const struct path
*from_path
,
1460 const struct path
*to_path
)
1462 return call_int_hook(move_mount
, 0, from_path
, to_path
);
1466 * security_path_notify() - Check if setting a watch is allowed
1469 * @obj_type: file path type
1471 * Check permissions before setting a watch on events as defined by @mask, on
1472 * an object at @path, whose type is defined by @obj_type.
1474 * Return: Returns 0 if permission is granted.
1476 int security_path_notify(const struct path
*path
, u64 mask
,
1477 unsigned int obj_type
)
1479 return call_int_hook(path_notify
, 0, path
, mask
, obj_type
);
1483 * security_inode_alloc() - Allocate an inode LSM blob
1486 * Allocate and attach a security structure to @inode->i_security. The
1487 * i_security field is initialized to NULL when the inode structure is
1490 * Return: Return 0 if operation was successful.
1492 int security_inode_alloc(struct inode
*inode
)
1494 int rc
= lsm_inode_alloc(inode
);
1498 rc
= call_int_hook(inode_alloc_security
, 0, inode
);
1500 security_inode_free(inode
);
1504 static void inode_free_by_rcu(struct rcu_head
*head
)
1507 * The rcu head is at the start of the inode blob
1509 kmem_cache_free(lsm_inode_cache
, head
);
1513 * security_inode_free() - Free an inode's LSM blob
1516 * Deallocate the inode security structure and set @inode->i_security to NULL.
1518 void security_inode_free(struct inode
*inode
)
1520 integrity_inode_free(inode
);
1521 call_void_hook(inode_free_security
, inode
);
1523 * The inode may still be referenced in a path walk and
1524 * a call to security_inode_permission() can be made
1525 * after inode_free_security() is called. Ideally, the VFS
1526 * wouldn't do this, but fixing that is a much harder
1527 * job. For now, simply free the i_security via RCU, and
1528 * leave the current inode->i_security pointer intact.
1529 * The inode will be freed after the RCU grace period too.
1531 if (inode
->i_security
)
1532 call_rcu((struct rcu_head
*)inode
->i_security
,
1537 * security_dentry_init_security() - Perform dentry initialization
1538 * @dentry: the dentry to initialize
1539 * @mode: mode used to determine resource type
1540 * @name: name of the last path component
1541 * @xattr_name: name of the security/LSM xattr
1542 * @ctx: pointer to the resulting LSM context
1543 * @ctxlen: length of @ctx
1545 * Compute a context for a dentry as the inode is not yet available since NFSv4
1546 * has no label backed by an EA anyway. It is important to note that
1547 * @xattr_name does not need to be free'd by the caller, it is a static string.
1549 * Return: Returns 0 on success, negative values on failure.
1551 int security_dentry_init_security(struct dentry
*dentry
, int mode
,
1552 const struct qstr
*name
,
1553 const char **xattr_name
, void **ctx
,
1556 struct security_hook_list
*hp
;
1560 * Only one module will provide a security context.
1562 hlist_for_each_entry(hp
, &security_hook_heads
.dentry_init_security
,
1564 rc
= hp
->hook
.dentry_init_security(dentry
, mode
, name
,
1565 xattr_name
, ctx
, ctxlen
);
1566 if (rc
!= LSM_RET_DEFAULT(dentry_init_security
))
1569 return LSM_RET_DEFAULT(dentry_init_security
);
1571 EXPORT_SYMBOL(security_dentry_init_security
);
1574 * security_dentry_create_files_as() - Perform dentry initialization
1575 * @dentry: the dentry to initialize
1576 * @mode: mode used to determine resource type
1577 * @name: name of the last path component
1578 * @old: creds to use for LSM context calculations
1579 * @new: creds to modify
1581 * Compute a context for a dentry as the inode is not yet available and set
1582 * that context in passed in creds so that new files are created using that
1583 * context. Context is calculated using the passed in creds and not the creds
1586 * Return: Returns 0 on success, error on failure.
1588 int security_dentry_create_files_as(struct dentry
*dentry
, int mode
,
1590 const struct cred
*old
, struct cred
*new)
1592 return call_int_hook(dentry_create_files_as
, 0, dentry
, mode
,
1595 EXPORT_SYMBOL(security_dentry_create_files_as
);
1598 * security_inode_init_security() - Initialize an inode's LSM context
1600 * @dir: parent directory
1601 * @qstr: last component of the pathname
1602 * @initxattrs: callback function to write xattrs
1603 * @fs_data: filesystem specific data
1605 * Obtain the security attribute name suffix and value to set on a newly
1606 * created inode and set up the incore security field for the new inode. This
1607 * hook is called by the fs code as part of the inode creation transaction and
1608 * provides for atomic labeling of the inode, unlike the post_create/mkdir/...
1609 * hooks called by the VFS.
1611 * The hook function is expected to populate the xattrs array, by calling
1612 * lsm_get_xattr_slot() to retrieve the slots reserved by the security module
1613 * with the lbs_xattr_count field of the lsm_blob_sizes structure. For each
1614 * slot, the hook function should set ->name to the attribute name suffix
1615 * (e.g. selinux), to allocate ->value (will be freed by the caller) and set it
1616 * to the attribute value, to set ->value_len to the length of the value. If
1617 * the security module does not use security attributes or does not wish to put
1618 * a security attribute on this particular inode, then it should return
1619 * -EOPNOTSUPP to skip this processing.
1621 * Return: Returns 0 if the LSM successfully initialized all of the inode
1622 * security attributes that are required, negative values otherwise.
1624 int security_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1625 const struct qstr
*qstr
,
1626 const initxattrs initxattrs
, void *fs_data
)
1628 struct security_hook_list
*hp
;
1629 struct xattr
*new_xattrs
= NULL
;
1630 int ret
= -EOPNOTSUPP
, xattr_count
= 0;
1632 if (unlikely(IS_PRIVATE(inode
)))
1635 if (!blob_sizes
.lbs_xattr_count
)
1639 /* Allocate +1 for EVM and +1 as terminator. */
1640 new_xattrs
= kcalloc(blob_sizes
.lbs_xattr_count
+ 2,
1641 sizeof(*new_xattrs
), GFP_NOFS
);
1646 hlist_for_each_entry(hp
, &security_hook_heads
.inode_init_security
,
1648 ret
= hp
->hook
.inode_init_security(inode
, dir
, qstr
, new_xattrs
,
1650 if (ret
&& ret
!= -EOPNOTSUPP
)
1653 * As documented in lsm_hooks.h, -EOPNOTSUPP in this context
1654 * means that the LSM is not willing to provide an xattr, not
1655 * that it wants to signal an error. Thus, continue to invoke
1656 * the remaining LSMs.
1660 /* If initxattrs() is NULL, xattr_count is zero, skip the call. */
1664 ret
= evm_inode_init_security(inode
, dir
, qstr
, new_xattrs
,
1668 ret
= initxattrs(inode
, new_xattrs
, fs_data
);
1670 for (; xattr_count
> 0; xattr_count
--)
1671 kfree(new_xattrs
[xattr_count
- 1].value
);
1673 return (ret
== -EOPNOTSUPP
) ? 0 : ret
;
1675 EXPORT_SYMBOL(security_inode_init_security
);
1678 * security_inode_init_security_anon() - Initialize an anonymous inode
1680 * @name: the anonymous inode class
1681 * @context_inode: an optional related inode
1683 * Set up the incore security field for the new anonymous inode and return
1684 * whether the inode creation is permitted by the security module or not.
1686 * Return: Returns 0 on success, -EACCES if the security module denies the
1687 * creation of this inode, or another -errno upon other errors.
1689 int security_inode_init_security_anon(struct inode
*inode
,
1690 const struct qstr
*name
,
1691 const struct inode
*context_inode
)
1693 return call_int_hook(inode_init_security_anon
, 0, inode
, name
,
1697 #ifdef CONFIG_SECURITY_PATH
1699 * security_path_mknod() - Check if creating a special file is allowed
1700 * @dir: parent directory
1702 * @mode: new file mode
1703 * @dev: device number
1705 * Check permissions when creating a file. Note that this hook is called even
1706 * if mknod operation is being done for a regular file.
1708 * Return: Returns 0 if permission is granted.
1710 int security_path_mknod(const struct path
*dir
, struct dentry
*dentry
,
1711 umode_t mode
, unsigned int dev
)
1713 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1715 return call_int_hook(path_mknod
, 0, dir
, dentry
, mode
, dev
);
1717 EXPORT_SYMBOL(security_path_mknod
);
1720 * security_path_mkdir() - Check if creating a new directory is allowed
1721 * @dir: parent directory
1722 * @dentry: new directory
1723 * @mode: new directory mode
1725 * Check permissions to create a new directory in the existing directory.
1727 * Return: Returns 0 if permission is granted.
1729 int security_path_mkdir(const struct path
*dir
, struct dentry
*dentry
,
1732 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1734 return call_int_hook(path_mkdir
, 0, dir
, dentry
, mode
);
1736 EXPORT_SYMBOL(security_path_mkdir
);
1739 * security_path_rmdir() - Check if removing a directory is allowed
1740 * @dir: parent directory
1741 * @dentry: directory to remove
1743 * Check the permission to remove a directory.
1745 * Return: Returns 0 if permission is granted.
1747 int security_path_rmdir(const struct path
*dir
, struct dentry
*dentry
)
1749 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1751 return call_int_hook(path_rmdir
, 0, dir
, dentry
);
1755 * security_path_unlink() - Check if removing a hard link is allowed
1756 * @dir: parent directory
1759 * Check the permission to remove a hard link to a file.
1761 * Return: Returns 0 if permission is granted.
1763 int security_path_unlink(const struct path
*dir
, struct dentry
*dentry
)
1765 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1767 return call_int_hook(path_unlink
, 0, dir
, dentry
);
1769 EXPORT_SYMBOL(security_path_unlink
);
1772 * security_path_symlink() - Check if creating a symbolic link is allowed
1773 * @dir: parent directory
1774 * @dentry: symbolic link
1775 * @old_name: file pathname
1777 * Check the permission to create a symbolic link to a file.
1779 * Return: Returns 0 if permission is granted.
1781 int security_path_symlink(const struct path
*dir
, struct dentry
*dentry
,
1782 const char *old_name
)
1784 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1786 return call_int_hook(path_symlink
, 0, dir
, dentry
, old_name
);
1790 * security_path_link - Check if creating a hard link is allowed
1791 * @old_dentry: existing file
1792 * @new_dir: new parent directory
1793 * @new_dentry: new link
1795 * Check permission before creating a new hard link to a file.
1797 * Return: Returns 0 if permission is granted.
1799 int security_path_link(struct dentry
*old_dentry
, const struct path
*new_dir
,
1800 struct dentry
*new_dentry
)
1802 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
))))
1804 return call_int_hook(path_link
, 0, old_dentry
, new_dir
, new_dentry
);
1808 * security_path_rename() - Check if renaming a file is allowed
1809 * @old_dir: parent directory of the old file
1810 * @old_dentry: the old file
1811 * @new_dir: parent directory of the new file
1812 * @new_dentry: the new file
1815 * Check for permission to rename a file or directory.
1817 * Return: Returns 0 if permission is granted.
1819 int security_path_rename(const struct path
*old_dir
, struct dentry
*old_dentry
,
1820 const struct path
*new_dir
, struct dentry
*new_dentry
,
1823 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
)) ||
1824 (d_is_positive(new_dentry
) &&
1825 IS_PRIVATE(d_backing_inode(new_dentry
)))))
1828 return call_int_hook(path_rename
, 0, old_dir
, old_dentry
, new_dir
,
1831 EXPORT_SYMBOL(security_path_rename
);
1834 * security_path_truncate() - Check if truncating a file is allowed
1837 * Check permission before truncating the file indicated by path. Note that
1838 * truncation permissions may also be checked based on already opened files,
1839 * using the security_file_truncate() hook.
1841 * Return: Returns 0 if permission is granted.
1843 int security_path_truncate(const struct path
*path
)
1845 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1847 return call_int_hook(path_truncate
, 0, path
);
1851 * security_path_chmod() - Check if changing the file's mode is allowed
1855 * Check for permission to change a mode of the file @path. The new mode is
1856 * specified in @mode which is a bitmask of constants from
1857 * <include/uapi/linux/stat.h>.
1859 * Return: Returns 0 if permission is granted.
1861 int security_path_chmod(const struct path
*path
, umode_t mode
)
1863 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1865 return call_int_hook(path_chmod
, 0, path
, mode
);
1869 * security_path_chown() - Check if changing the file's owner/group is allowed
1874 * Check for permission to change owner/group of a file or directory.
1876 * Return: Returns 0 if permission is granted.
1878 int security_path_chown(const struct path
*path
, kuid_t uid
, kgid_t gid
)
1880 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1882 return call_int_hook(path_chown
, 0, path
, uid
, gid
);
1886 * security_path_chroot() - Check if changing the root directory is allowed
1889 * Check for permission to change root directory.
1891 * Return: Returns 0 if permission is granted.
1893 int security_path_chroot(const struct path
*path
)
1895 return call_int_hook(path_chroot
, 0, path
);
1897 #endif /* CONFIG_SECURITY_PATH */
1900 * security_inode_create() - Check if creating a file is allowed
1901 * @dir: the parent directory
1902 * @dentry: the file being created
1903 * @mode: requested file mode
1905 * Check permission to create a regular file.
1907 * Return: Returns 0 if permission is granted.
1909 int security_inode_create(struct inode
*dir
, struct dentry
*dentry
,
1912 if (unlikely(IS_PRIVATE(dir
)))
1914 return call_int_hook(inode_create
, 0, dir
, dentry
, mode
);
1916 EXPORT_SYMBOL_GPL(security_inode_create
);
1919 * security_inode_link() - Check if creating a hard link is allowed
1920 * @old_dentry: existing file
1921 * @dir: new parent directory
1922 * @new_dentry: new link
1924 * Check permission before creating a new hard link to a file.
1926 * Return: Returns 0 if permission is granted.
1928 int security_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1929 struct dentry
*new_dentry
)
1931 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
))))
1933 return call_int_hook(inode_link
, 0, old_dentry
, dir
, new_dentry
);
1937 * security_inode_unlink() - Check if removing a hard link is allowed
1938 * @dir: parent directory
1941 * Check the permission to remove a hard link to a file.
1943 * Return: Returns 0 if permission is granted.
1945 int security_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1947 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1949 return call_int_hook(inode_unlink
, 0, dir
, dentry
);
1953 * security_inode_symlink() - Check if creating a symbolic link is allowed
1954 * @dir: parent directory
1955 * @dentry: symbolic link
1956 * @old_name: existing filename
1958 * Check the permission to create a symbolic link to a file.
1960 * Return: Returns 0 if permission is granted.
1962 int security_inode_symlink(struct inode
*dir
, struct dentry
*dentry
,
1963 const char *old_name
)
1965 if (unlikely(IS_PRIVATE(dir
)))
1967 return call_int_hook(inode_symlink
, 0, dir
, dentry
, old_name
);
1971 * security_inode_mkdir() - Check if creation a new director is allowed
1972 * @dir: parent directory
1973 * @dentry: new directory
1974 * @mode: new directory mode
1976 * Check permissions to create a new directory in the existing directory
1977 * associated with inode structure @dir.
1979 * Return: Returns 0 if permission is granted.
1981 int security_inode_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
1983 if (unlikely(IS_PRIVATE(dir
)))
1985 return call_int_hook(inode_mkdir
, 0, dir
, dentry
, mode
);
1987 EXPORT_SYMBOL_GPL(security_inode_mkdir
);
1990 * security_inode_rmdir() - Check if removing a directory is allowed
1991 * @dir: parent directory
1992 * @dentry: directory to be removed
1994 * Check the permission to remove a directory.
1996 * Return: Returns 0 if permission is granted.
1998 int security_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
2000 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2002 return call_int_hook(inode_rmdir
, 0, dir
, dentry
);
2006 * security_inode_mknod() - Check if creating a special file is allowed
2007 * @dir: parent directory
2009 * @mode: new file mode
2010 * @dev: device number
2012 * Check permissions when creating a special file (or a socket or a fifo file
2013 * created via the mknod system call). Note that if mknod operation is being
2014 * done for a regular file, then the create hook will be called and not this
2017 * Return: Returns 0 if permission is granted.
2019 int security_inode_mknod(struct inode
*dir
, struct dentry
*dentry
,
2020 umode_t mode
, dev_t dev
)
2022 if (unlikely(IS_PRIVATE(dir
)))
2024 return call_int_hook(inode_mknod
, 0, dir
, dentry
, mode
, dev
);
2028 * security_inode_rename() - Check if renaming a file is allowed
2029 * @old_dir: parent directory of the old file
2030 * @old_dentry: the old file
2031 * @new_dir: parent directory of the new file
2032 * @new_dentry: the new file
2035 * Check for permission to rename a file or directory.
2037 * Return: Returns 0 if permission is granted.
2039 int security_inode_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
2040 struct inode
*new_dir
, struct dentry
*new_dentry
,
2043 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
)) ||
2044 (d_is_positive(new_dentry
) &&
2045 IS_PRIVATE(d_backing_inode(new_dentry
)))))
2048 if (flags
& RENAME_EXCHANGE
) {
2049 int err
= call_int_hook(inode_rename
, 0, new_dir
, new_dentry
,
2050 old_dir
, old_dentry
);
2055 return call_int_hook(inode_rename
, 0, old_dir
, old_dentry
,
2056 new_dir
, new_dentry
);
2060 * security_inode_readlink() - Check if reading a symbolic link is allowed
2063 * Check the permission to read the symbolic link.
2065 * Return: Returns 0 if permission is granted.
2067 int security_inode_readlink(struct dentry
*dentry
)
2069 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2071 return call_int_hook(inode_readlink
, 0, dentry
);
2075 * security_inode_follow_link() - Check if following a symbolic link is allowed
2076 * @dentry: link dentry
2077 * @inode: link inode
2078 * @rcu: true if in RCU-walk mode
2080 * Check permission to follow a symbolic link when looking up a pathname. If
2081 * @rcu is true, @inode is not stable.
2083 * Return: Returns 0 if permission is granted.
2085 int security_inode_follow_link(struct dentry
*dentry
, struct inode
*inode
,
2088 if (unlikely(IS_PRIVATE(inode
)))
2090 return call_int_hook(inode_follow_link
, 0, dentry
, inode
, rcu
);
2094 * security_inode_permission() - Check if accessing an inode is allowed
2096 * @mask: access mask
2098 * Check permission before accessing an inode. This hook is called by the
2099 * existing Linux permission function, so a security module can use it to
2100 * provide additional checking for existing Linux permission checks. Notice
2101 * that this hook is called when a file is opened (as well as many other
2102 * operations), whereas the file_security_ops permission hook is called when
2103 * the actual read/write operations are performed.
2105 * Return: Returns 0 if permission is granted.
2107 int security_inode_permission(struct inode
*inode
, int mask
)
2109 if (unlikely(IS_PRIVATE(inode
)))
2111 return call_int_hook(inode_permission
, 0, inode
, mask
);
2115 * security_inode_setattr() - Check if setting file attributes is allowed
2116 * @idmap: idmap of the mount
2118 * @attr: new attributes
2120 * Check permission before setting file attributes. Note that the kernel call
2121 * to notify_change is performed from several locations, whenever file
2122 * attributes change (such as when a file is truncated, chown/chmod operations,
2123 * transferring disk quotas, etc).
2125 * Return: Returns 0 if permission is granted.
2127 int security_inode_setattr(struct mnt_idmap
*idmap
,
2128 struct dentry
*dentry
, struct iattr
*attr
)
2132 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2134 ret
= call_int_hook(inode_setattr
, 0, dentry
, attr
);
2137 return evm_inode_setattr(idmap
, dentry
, attr
);
2139 EXPORT_SYMBOL_GPL(security_inode_setattr
);
2142 * security_inode_getattr() - Check if getting file attributes is allowed
2145 * Check permission before obtaining file attributes.
2147 * Return: Returns 0 if permission is granted.
2149 int security_inode_getattr(const struct path
*path
)
2151 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
2153 return call_int_hook(inode_getattr
, 0, path
);
2157 * security_inode_setxattr() - Check if setting file xattrs is allowed
2158 * @idmap: idmap of the mount
2161 * @value: xattr value
2162 * @size: size of xattr value
2165 * Check permission before setting the extended attributes.
2167 * Return: Returns 0 if permission is granted.
2169 int security_inode_setxattr(struct mnt_idmap
*idmap
,
2170 struct dentry
*dentry
, const char *name
,
2171 const void *value
, size_t size
, int flags
)
2175 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2178 * SELinux and Smack integrate the cap call,
2179 * so assume that all LSMs supplying this call do so.
2181 ret
= call_int_hook(inode_setxattr
, 1, idmap
, dentry
, name
, value
,
2185 ret
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
2188 ret
= ima_inode_setxattr(dentry
, name
, value
, size
);
2191 return evm_inode_setxattr(idmap
, dentry
, name
, value
, size
);
2195 * security_inode_set_acl() - Check if setting posix acls is allowed
2196 * @idmap: idmap of the mount
2198 * @acl_name: acl name
2201 * Check permission before setting posix acls, the posix acls in @kacl are
2202 * identified by @acl_name.
2204 * Return: Returns 0 if permission is granted.
2206 int security_inode_set_acl(struct mnt_idmap
*idmap
,
2207 struct dentry
*dentry
, const char *acl_name
,
2208 struct posix_acl
*kacl
)
2212 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2214 ret
= call_int_hook(inode_set_acl
, 0, idmap
, dentry
, acl_name
,
2218 ret
= ima_inode_set_acl(idmap
, dentry
, acl_name
, kacl
);
2221 return evm_inode_set_acl(idmap
, dentry
, acl_name
, kacl
);
2225 * security_inode_get_acl() - Check if reading posix acls is allowed
2226 * @idmap: idmap of the mount
2228 * @acl_name: acl name
2230 * Check permission before getting osix acls, the posix acls are identified by
2233 * Return: Returns 0 if permission is granted.
2235 int security_inode_get_acl(struct mnt_idmap
*idmap
,
2236 struct dentry
*dentry
, const char *acl_name
)
2238 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2240 return call_int_hook(inode_get_acl
, 0, idmap
, dentry
, acl_name
);
2244 * security_inode_remove_acl() - Check if removing a posix acl is allowed
2245 * @idmap: idmap of the mount
2247 * @acl_name: acl name
2249 * Check permission before removing posix acls, the posix acls are identified
2252 * Return: Returns 0 if permission is granted.
2254 int security_inode_remove_acl(struct mnt_idmap
*idmap
,
2255 struct dentry
*dentry
, const char *acl_name
)
2259 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2261 ret
= call_int_hook(inode_remove_acl
, 0, idmap
, dentry
, acl_name
);
2264 ret
= ima_inode_remove_acl(idmap
, dentry
, acl_name
);
2267 return evm_inode_remove_acl(idmap
, dentry
, acl_name
);
2271 * security_inode_post_setxattr() - Update the inode after a setxattr operation
2274 * @value: xattr value
2275 * @size: xattr value size
2278 * Update inode security field after successful setxattr operation.
2280 void security_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
2281 const void *value
, size_t size
, int flags
)
2283 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2285 call_void_hook(inode_post_setxattr
, dentry
, name
, value
, size
, flags
);
2286 evm_inode_post_setxattr(dentry
, name
, value
, size
);
2290 * security_inode_getxattr() - Check if xattr access is allowed
2294 * Check permission before obtaining the extended attributes identified by
2295 * @name for @dentry.
2297 * Return: Returns 0 if permission is granted.
2299 int security_inode_getxattr(struct dentry
*dentry
, const char *name
)
2301 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2303 return call_int_hook(inode_getxattr
, 0, dentry
, name
);
2307 * security_inode_listxattr() - Check if listing xattrs is allowed
2310 * Check permission before obtaining the list of extended attribute names for
2313 * Return: Returns 0 if permission is granted.
2315 int security_inode_listxattr(struct dentry
*dentry
)
2317 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2319 return call_int_hook(inode_listxattr
, 0, dentry
);
2323 * security_inode_removexattr() - Check if removing an xattr is allowed
2324 * @idmap: idmap of the mount
2328 * Check permission before removing the extended attribute identified by @name
2331 * Return: Returns 0 if permission is granted.
2333 int security_inode_removexattr(struct mnt_idmap
*idmap
,
2334 struct dentry
*dentry
, const char *name
)
2338 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2341 * SELinux and Smack integrate the cap call,
2342 * so assume that all LSMs supplying this call do so.
2344 ret
= call_int_hook(inode_removexattr
, 1, idmap
, dentry
, name
);
2346 ret
= cap_inode_removexattr(idmap
, dentry
, name
);
2349 ret
= ima_inode_removexattr(dentry
, name
);
2352 return evm_inode_removexattr(idmap
, dentry
, name
);
2356 * security_inode_need_killpriv() - Check if security_inode_killpriv() required
2357 * @dentry: associated dentry
2359 * Called when an inode has been changed to determine if
2360 * security_inode_killpriv() should be called.
2362 * Return: Return <0 on error to abort the inode change operation, return 0 if
2363 * security_inode_killpriv() does not need to be called, return >0 if
2364 * security_inode_killpriv() does need to be called.
2366 int security_inode_need_killpriv(struct dentry
*dentry
)
2368 return call_int_hook(inode_need_killpriv
, 0, dentry
);
2372 * security_inode_killpriv() - The setuid bit is removed, update LSM state
2373 * @idmap: idmap of the mount
2374 * @dentry: associated dentry
2376 * The @dentry's setuid bit is being removed. Remove similar security labels.
2377 * Called with the dentry->d_inode->i_mutex held.
2379 * Return: Return 0 on success. If error is returned, then the operation
2380 * causing setuid bit removal is failed.
2382 int security_inode_killpriv(struct mnt_idmap
*idmap
,
2383 struct dentry
*dentry
)
2385 return call_int_hook(inode_killpriv
, 0, idmap
, dentry
);
2389 * security_inode_getsecurity() - Get the xattr security label of an inode
2390 * @idmap: idmap of the mount
2393 * @buffer: security label buffer
2394 * @alloc: allocation flag
2396 * Retrieve a copy of the extended attribute representation of the security
2397 * label associated with @name for @inode via @buffer. Note that @name is the
2398 * remainder of the attribute name after the security prefix has been removed.
2399 * @alloc is used to specify if the call should return a value via the buffer
2400 * or just the value length.
2402 * Return: Returns size of buffer on success.
2404 int security_inode_getsecurity(struct mnt_idmap
*idmap
,
2405 struct inode
*inode
, const char *name
,
2406 void **buffer
, bool alloc
)
2408 struct security_hook_list
*hp
;
2411 if (unlikely(IS_PRIVATE(inode
)))
2412 return LSM_RET_DEFAULT(inode_getsecurity
);
2414 * Only one module will provide an attribute with a given name.
2416 hlist_for_each_entry(hp
, &security_hook_heads
.inode_getsecurity
, list
) {
2417 rc
= hp
->hook
.inode_getsecurity(idmap
, inode
, name
, buffer
,
2419 if (rc
!= LSM_RET_DEFAULT(inode_getsecurity
))
2422 return LSM_RET_DEFAULT(inode_getsecurity
);
2426 * security_inode_setsecurity() - Set the xattr security label of an inode
2429 * @value: security label
2430 * @size: length of security label
2433 * Set the security label associated with @name for @inode from the extended
2434 * attribute value @value. @size indicates the size of the @value in bytes.
2435 * @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
2436 * remainder of the attribute name after the security. prefix has been removed.
2438 * Return: Returns 0 on success.
2440 int security_inode_setsecurity(struct inode
*inode
, const char *name
,
2441 const void *value
, size_t size
, int flags
)
2443 struct security_hook_list
*hp
;
2446 if (unlikely(IS_PRIVATE(inode
)))
2447 return LSM_RET_DEFAULT(inode_setsecurity
);
2449 * Only one module will provide an attribute with a given name.
2451 hlist_for_each_entry(hp
, &security_hook_heads
.inode_setsecurity
, list
) {
2452 rc
= hp
->hook
.inode_setsecurity(inode
, name
, value
, size
,
2454 if (rc
!= LSM_RET_DEFAULT(inode_setsecurity
))
2457 return LSM_RET_DEFAULT(inode_setsecurity
);
2461 * security_inode_listsecurity() - List the xattr security label names
2464 * @buffer_size: size of buffer
2466 * Copy the extended attribute names for the security labels associated with
2467 * @inode into @buffer. The maximum size of @buffer is specified by
2468 * @buffer_size. @buffer may be NULL to request the size of the buffer
2471 * Return: Returns number of bytes used/required on success.
2473 int security_inode_listsecurity(struct inode
*inode
,
2474 char *buffer
, size_t buffer_size
)
2476 if (unlikely(IS_PRIVATE(inode
)))
2478 return call_int_hook(inode_listsecurity
, 0, inode
, buffer
, buffer_size
);
2480 EXPORT_SYMBOL(security_inode_listsecurity
);
2483 * security_inode_getsecid() - Get an inode's secid
2485 * @secid: secid to return
2487 * Get the secid associated with the node. In case of failure, @secid will be
2490 void security_inode_getsecid(struct inode
*inode
, u32
*secid
)
2492 call_void_hook(inode_getsecid
, inode
, secid
);
2496 * security_inode_copy_up() - Create new creds for an overlayfs copy-up op
2497 * @src: union dentry of copy-up file
2498 * @new: newly created creds
2500 * A file is about to be copied up from lower layer to upper layer of overlay
2501 * filesystem. Security module can prepare a set of new creds and modify as
2502 * need be and return new creds. Caller will switch to new creds temporarily to
2503 * create new file and release newly allocated creds.
2505 * Return: Returns 0 on success or a negative error code on error.
2507 int security_inode_copy_up(struct dentry
*src
, struct cred
**new)
2509 return call_int_hook(inode_copy_up
, 0, src
, new);
2511 EXPORT_SYMBOL(security_inode_copy_up
);
2514 * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
2517 * Filter the xattrs being copied up when a unioned file is copied up from a
2518 * lower layer to the union/overlay layer. The caller is responsible for
2519 * reading and writing the xattrs, this hook is merely a filter.
2521 * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
2522 * if the security module does not know about attribute, or a negative
2523 * error code to abort the copy up.
2525 int security_inode_copy_up_xattr(const char *name
)
2527 struct security_hook_list
*hp
;
2531 * The implementation can return 0 (accept the xattr), 1 (discard the
2532 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
2533 * any other error code in case of an error.
2535 hlist_for_each_entry(hp
,
2536 &security_hook_heads
.inode_copy_up_xattr
, list
) {
2537 rc
= hp
->hook
.inode_copy_up_xattr(name
);
2538 if (rc
!= LSM_RET_DEFAULT(inode_copy_up_xattr
))
2542 return LSM_RET_DEFAULT(inode_copy_up_xattr
);
2544 EXPORT_SYMBOL(security_inode_copy_up_xattr
);
2547 * security_kernfs_init_security() - Init LSM context for a kernfs node
2548 * @kn_dir: parent kernfs node
2549 * @kn: the kernfs node to initialize
2551 * Initialize the security context of a newly created kernfs node based on its
2552 * own and its parent's attributes.
2554 * Return: Returns 0 if permission is granted.
2556 int security_kernfs_init_security(struct kernfs_node
*kn_dir
,
2557 struct kernfs_node
*kn
)
2559 return call_int_hook(kernfs_init_security
, 0, kn_dir
, kn
);
2563 * security_file_permission() - Check file permissions
2565 * @mask: requested permissions
2567 * Check file permissions before accessing an open file. This hook is called
2568 * by various operations that read or write files. A security module can use
2569 * this hook to perform additional checking on these operations, e.g. to
2570 * revalidate permissions on use to support privilege bracketing or policy
2571 * changes. Notice that this hook is used when the actual read/write
2572 * operations are performed, whereas the inode_security_ops hook is called when
2573 * a file is opened (as well as many other operations). Although this hook can
2574 * be used to revalidate permissions for various system call operations that
2575 * read or write files, it does not address the revalidation of permissions for
2576 * memory-mapped files. Security modules must handle this separately if they
2577 * need such revalidation.
2579 * Return: Returns 0 if permission is granted.
2581 int security_file_permission(struct file
*file
, int mask
)
2585 ret
= call_int_hook(file_permission
, 0, file
, mask
);
2589 return fsnotify_perm(file
, mask
);
2593 * security_file_alloc() - Allocate and init a file's LSM blob
2596 * Allocate and attach a security structure to the file->f_security field. The
2597 * security field is initialized to NULL when the structure is first created.
2599 * Return: Return 0 if the hook is successful and permission is granted.
2601 int security_file_alloc(struct file
*file
)
2603 int rc
= lsm_file_alloc(file
);
2607 rc
= call_int_hook(file_alloc_security
, 0, file
);
2609 security_file_free(file
);
2614 * security_file_free() - Free a file's LSM blob
2617 * Deallocate and free any security structures stored in file->f_security.
2619 void security_file_free(struct file
*file
)
2623 call_void_hook(file_free_security
, file
);
2625 blob
= file
->f_security
;
2627 file
->f_security
= NULL
;
2628 kmem_cache_free(lsm_file_cache
, blob
);
2633 * security_file_ioctl() - Check if an ioctl is allowed
2634 * @file: associated file
2636 * @arg: ioctl arguments
2638 * Check permission for an ioctl operation on @file. Note that @arg sometimes
2639 * represents a user space pointer; in other cases, it may be a simple integer
2640 * value. When @arg represents a user space pointer, it should never be used
2641 * by the security module.
2643 * Return: Returns 0 if permission is granted.
2645 int security_file_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2647 return call_int_hook(file_ioctl
, 0, file
, cmd
, arg
);
2649 EXPORT_SYMBOL_GPL(security_file_ioctl
);
2651 static inline unsigned long mmap_prot(struct file
*file
, unsigned long prot
)
2654 * Does we have PROT_READ and does the application expect
2655 * it to imply PROT_EXEC? If not, nothing to talk about...
2657 if ((prot
& (PROT_READ
| PROT_EXEC
)) != PROT_READ
)
2659 if (!(current
->personality
& READ_IMPLIES_EXEC
))
2662 * if that's an anonymous mapping, let it.
2665 return prot
| PROT_EXEC
;
2667 * ditto if it's not on noexec mount, except that on !MMU we need
2668 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
2670 if (!path_noexec(&file
->f_path
)) {
2672 if (file
->f_op
->mmap_capabilities
) {
2673 unsigned caps
= file
->f_op
->mmap_capabilities(file
);
2674 if (!(caps
& NOMMU_MAP_EXEC
))
2678 return prot
| PROT_EXEC
;
2680 /* anything on noexec mount won't get PROT_EXEC */
2685 * security_mmap_file() - Check if mmap'ing a file is allowed
2687 * @prot: protection applied by the kernel
2690 * Check permissions for a mmap operation. The @file may be NULL, e.g. if
2691 * mapping anonymous memory.
2693 * Return: Returns 0 if permission is granted.
2695 int security_mmap_file(struct file
*file
, unsigned long prot
,
2696 unsigned long flags
)
2698 unsigned long prot_adj
= mmap_prot(file
, prot
);
2701 ret
= call_int_hook(mmap_file
, 0, file
, prot
, prot_adj
, flags
);
2704 return ima_file_mmap(file
, prot
, prot_adj
, flags
);
2708 * security_mmap_addr() - Check if mmap'ing an address is allowed
2711 * Check permissions for a mmap operation at @addr.
2713 * Return: Returns 0 if permission is granted.
2715 int security_mmap_addr(unsigned long addr
)
2717 return call_int_hook(mmap_addr
, 0, addr
);
2721 * security_file_mprotect() - Check if changing memory protections is allowed
2722 * @vma: memory region
2723 * @reqprot: application requested protection
2724 * @prot: protection applied by the kernel
2726 * Check permissions before changing memory access permissions.
2728 * Return: Returns 0 if permission is granted.
2730 int security_file_mprotect(struct vm_area_struct
*vma
, unsigned long reqprot
,
2735 ret
= call_int_hook(file_mprotect
, 0, vma
, reqprot
, prot
);
2738 return ima_file_mprotect(vma
, prot
);
2742 * security_file_lock() - Check if a file lock is allowed
2744 * @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
2746 * Check permission before performing file locking operations. Note the hook
2747 * mediates both flock and fcntl style locks.
2749 * Return: Returns 0 if permission is granted.
2751 int security_file_lock(struct file
*file
, unsigned int cmd
)
2753 return call_int_hook(file_lock
, 0, file
, cmd
);
2757 * security_file_fcntl() - Check if fcntl() op is allowed
2759 * @cmd: fcntl command
2760 * @arg: command argument
2762 * Check permission before allowing the file operation specified by @cmd from
2763 * being performed on the file @file. Note that @arg sometimes represents a
2764 * user space pointer; in other cases, it may be a simple integer value. When
2765 * @arg represents a user space pointer, it should never be used by the
2768 * Return: Returns 0 if permission is granted.
2770 int security_file_fcntl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2772 return call_int_hook(file_fcntl
, 0, file
, cmd
, arg
);
2776 * security_file_set_fowner() - Set the file owner info in the LSM blob
2779 * Save owner security information (typically from current->security) in
2780 * file->f_security for later use by the send_sigiotask hook.
2782 * Return: Returns 0 on success.
2784 void security_file_set_fowner(struct file
*file
)
2786 call_void_hook(file_set_fowner
, file
);
2790 * security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
2792 * @fown: signal sender
2793 * @sig: signal to be sent, SIGIO is sent if 0
2795 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
2796 * process @tsk. Note that this hook is sometimes called from interrupt. Note
2797 * that the fown_struct, @fown, is never outside the context of a struct file,
2798 * so the file structure (and associated security information) can always be
2799 * obtained: container_of(fown, struct file, f_owner).
2801 * Return: Returns 0 if permission is granted.
2803 int security_file_send_sigiotask(struct task_struct
*tsk
,
2804 struct fown_struct
*fown
, int sig
)
2806 return call_int_hook(file_send_sigiotask
, 0, tsk
, fown
, sig
);
2810 * security_file_receive() - Check is receiving a file via IPC is allowed
2811 * @file: file being received
2813 * This hook allows security modules to control the ability of a process to
2814 * receive an open file descriptor via socket IPC.
2816 * Return: Returns 0 if permission is granted.
2818 int security_file_receive(struct file
*file
)
2820 return call_int_hook(file_receive
, 0, file
);
2824 * security_file_open() - Save open() time state for late use by the LSM
2827 * Save open-time permission checking state for later use upon file_permission,
2828 * and recheck access if anything has changed since inode_permission.
2830 * Return: Returns 0 if permission is granted.
2832 int security_file_open(struct file
*file
)
2836 ret
= call_int_hook(file_open
, 0, file
);
2840 return fsnotify_perm(file
, MAY_OPEN
);
2844 * security_file_truncate() - Check if truncating a file is allowed
2847 * Check permission before truncating a file, i.e. using ftruncate. Note that
2848 * truncation permission may also be checked based on the path, using the
2849 * @path_truncate hook.
2851 * Return: Returns 0 if permission is granted.
2853 int security_file_truncate(struct file
*file
)
2855 return call_int_hook(file_truncate
, 0, file
);
2859 * security_task_alloc() - Allocate a task's LSM blob
2861 * @clone_flags: flags indicating what is being shared
2863 * Handle allocation of task-related resources.
2865 * Return: Returns a zero on success, negative values on failure.
2867 int security_task_alloc(struct task_struct
*task
, unsigned long clone_flags
)
2869 int rc
= lsm_task_alloc(task
);
2873 rc
= call_int_hook(task_alloc
, 0, task
, clone_flags
);
2875 security_task_free(task
);
2880 * security_task_free() - Free a task's LSM blob and related resources
2883 * Handle release of task-related resources. Note that this can be called from
2884 * interrupt context.
2886 void security_task_free(struct task_struct
*task
)
2888 call_void_hook(task_free
, task
);
2890 kfree(task
->security
);
2891 task
->security
= NULL
;
2895 * security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
2896 * @cred: credentials
2899 * Only allocate sufficient memory and attach to @cred such that
2900 * cred_transfer() will not get ENOMEM.
2902 * Return: Returns 0 on success, negative values on failure.
2904 int security_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
2906 int rc
= lsm_cred_alloc(cred
, gfp
);
2911 rc
= call_int_hook(cred_alloc_blank
, 0, cred
, gfp
);
2913 security_cred_free(cred
);
2918 * security_cred_free() - Free the cred's LSM blob and associated resources
2919 * @cred: credentials
2921 * Deallocate and clear the cred->security field in a set of credentials.
2923 void security_cred_free(struct cred
*cred
)
2926 * There is a failure case in prepare_creds() that
2927 * may result in a call here with ->security being NULL.
2929 if (unlikely(cred
->security
== NULL
))
2932 call_void_hook(cred_free
, cred
);
2934 kfree(cred
->security
);
2935 cred
->security
= NULL
;
2939 * security_prepare_creds() - Prepare a new set of credentials
2940 * @new: new credentials
2941 * @old: original credentials
2944 * Prepare a new set of credentials by copying the data from the old set.
2946 * Return: Returns 0 on success, negative values on failure.
2948 int security_prepare_creds(struct cred
*new, const struct cred
*old
, gfp_t gfp
)
2950 int rc
= lsm_cred_alloc(new, gfp
);
2955 rc
= call_int_hook(cred_prepare
, 0, new, old
, gfp
);
2957 security_cred_free(new);
2962 * security_transfer_creds() - Transfer creds
2963 * @new: target credentials
2964 * @old: original credentials
2966 * Transfer data from original creds to new creds.
2968 void security_transfer_creds(struct cred
*new, const struct cred
*old
)
2970 call_void_hook(cred_transfer
, new, old
);
2974 * security_cred_getsecid() - Get the secid from a set of credentials
2976 * @secid: secid value
2978 * Retrieve the security identifier of the cred structure @c. In case of
2979 * failure, @secid will be set to zero.
2981 void security_cred_getsecid(const struct cred
*c
, u32
*secid
)
2984 call_void_hook(cred_getsecid
, c
, secid
);
2986 EXPORT_SYMBOL(security_cred_getsecid
);
2989 * security_kernel_act_as() - Set the kernel credentials to act as secid
2993 * Set the credentials for a kernel service to act as (subjective context).
2994 * The current task must be the one that nominated @secid.
2996 * Return: Returns 0 if successful.
2998 int security_kernel_act_as(struct cred
*new, u32 secid
)
3000 return call_int_hook(kernel_act_as
, 0, new, secid
);
3004 * security_kernel_create_files_as() - Set file creation context using an inode
3005 * @new: target credentials
3006 * @inode: reference inode
3008 * Set the file creation context in a set of credentials to be the same as the
3009 * objective context of the specified inode. The current task must be the one
3010 * that nominated @inode.
3012 * Return: Returns 0 if successful.
3014 int security_kernel_create_files_as(struct cred
*new, struct inode
*inode
)
3016 return call_int_hook(kernel_create_files_as
, 0, new, inode
);
3020 * security_kernel_module_request() - Check is loading a module is allowed
3021 * @kmod_name: module name
3023 * Ability to trigger the kernel to automatically upcall to userspace for
3024 * userspace to load a kernel module with the given name.
3026 * Return: Returns 0 if successful.
3028 int security_kernel_module_request(char *kmod_name
)
3032 ret
= call_int_hook(kernel_module_request
, 0, kmod_name
);
3035 return integrity_kernel_module_request(kmod_name
);
3039 * security_kernel_read_file() - Read a file specified by userspace
3041 * @id: file identifier
3042 * @contents: trust if security_kernel_post_read_file() will be called
3044 * Read a file specified by userspace.
3046 * Return: Returns 0 if permission is granted.
3048 int security_kernel_read_file(struct file
*file
, enum kernel_read_file_id id
,
3053 ret
= call_int_hook(kernel_read_file
, 0, file
, id
, contents
);
3056 return ima_read_file(file
, id
, contents
);
3058 EXPORT_SYMBOL_GPL(security_kernel_read_file
);
3061 * security_kernel_post_read_file() - Read a file specified by userspace
3063 * @buf: file contents
3064 * @size: size of file contents
3065 * @id: file identifier
3067 * Read a file specified by userspace. This must be paired with a prior call
3068 * to security_kernel_read_file() call that indicated this hook would also be
3069 * called, see security_kernel_read_file() for more information.
3071 * Return: Returns 0 if permission is granted.
3073 int security_kernel_post_read_file(struct file
*file
, char *buf
, loff_t size
,
3074 enum kernel_read_file_id id
)
3078 ret
= call_int_hook(kernel_post_read_file
, 0, file
, buf
, size
, id
);
3081 return ima_post_read_file(file
, buf
, size
, id
);
3083 EXPORT_SYMBOL_GPL(security_kernel_post_read_file
);
3086 * security_kernel_load_data() - Load data provided by userspace
3087 * @id: data identifier
3088 * @contents: true if security_kernel_post_load_data() will be called
3090 * Load data provided by userspace.
3092 * Return: Returns 0 if permission is granted.
3094 int security_kernel_load_data(enum kernel_load_data_id id
, bool contents
)
3098 ret
= call_int_hook(kernel_load_data
, 0, id
, contents
);
3101 return ima_load_data(id
, contents
);
3103 EXPORT_SYMBOL_GPL(security_kernel_load_data
);
3106 * security_kernel_post_load_data() - Load userspace data from a non-file source
3108 * @size: size of data
3109 * @id: data identifier
3110 * @description: text description of data, specific to the id value
3112 * Load data provided by a non-file source (usually userspace buffer). This
3113 * must be paired with a prior security_kernel_load_data() call that indicated
3114 * this hook would also be called, see security_kernel_load_data() for more
3117 * Return: Returns 0 if permission is granted.
3119 int security_kernel_post_load_data(char *buf
, loff_t size
,
3120 enum kernel_load_data_id id
,
3125 ret
= call_int_hook(kernel_post_load_data
, 0, buf
, size
, id
,
3129 return ima_post_load_data(buf
, size
, id
, description
);
3131 EXPORT_SYMBOL_GPL(security_kernel_post_load_data
);
3134 * security_task_fix_setuid() - Update LSM with new user id attributes
3135 * @new: updated credentials
3136 * @old: credentials being replaced
3137 * @flags: LSM_SETID_* flag values
3139 * Update the module's state after setting one or more of the user identity
3140 * attributes of the current process. The @flags parameter indicates which of
3141 * the set*uid system calls invoked this hook. If @new is the set of
3142 * credentials that will be installed. Modifications should be made to this
3143 * rather than to @current->cred.
3145 * Return: Returns 0 on success.
3147 int security_task_fix_setuid(struct cred
*new, const struct cred
*old
,
3150 return call_int_hook(task_fix_setuid
, 0, new, old
, flags
);
3154 * security_task_fix_setgid() - Update LSM with new group id attributes
3155 * @new: updated credentials
3156 * @old: credentials being replaced
3157 * @flags: LSM_SETID_* flag value
3159 * Update the module's state after setting one or more of the group identity
3160 * attributes of the current process. The @flags parameter indicates which of
3161 * the set*gid system calls invoked this hook. @new is the set of credentials
3162 * that will be installed. Modifications should be made to this rather than to
3165 * Return: Returns 0 on success.
3167 int security_task_fix_setgid(struct cred
*new, const struct cred
*old
,
3170 return call_int_hook(task_fix_setgid
, 0, new, old
, flags
);
3174 * security_task_fix_setgroups() - Update LSM with new supplementary groups
3175 * @new: updated credentials
3176 * @old: credentials being replaced
3178 * Update the module's state after setting the supplementary group identity
3179 * attributes of the current process. @new is the set of credentials that will
3180 * be installed. Modifications should be made to this rather than to
3183 * Return: Returns 0 on success.
3185 int security_task_fix_setgroups(struct cred
*new, const struct cred
*old
)
3187 return call_int_hook(task_fix_setgroups
, 0, new, old
);
3191 * security_task_setpgid() - Check if setting the pgid is allowed
3192 * @p: task being modified
3195 * Check permission before setting the process group identifier of the process
3198 * Return: Returns 0 if permission is granted.
3200 int security_task_setpgid(struct task_struct
*p
, pid_t pgid
)
3202 return call_int_hook(task_setpgid
, 0, p
, pgid
);
3206 * security_task_getpgid() - Check if getting the pgid is allowed
3209 * Check permission before getting the process group identifier of the process
3212 * Return: Returns 0 if permission is granted.
3214 int security_task_getpgid(struct task_struct
*p
)
3216 return call_int_hook(task_getpgid
, 0, p
);
3220 * security_task_getsid() - Check if getting the session id is allowed
3223 * Check permission before getting the session identifier of the process @p.
3225 * Return: Returns 0 if permission is granted.
3227 int security_task_getsid(struct task_struct
*p
)
3229 return call_int_hook(task_getsid
, 0, p
);
3233 * security_current_getsecid_subj() - Get the current task's subjective secid
3234 * @secid: secid value
3236 * Retrieve the subjective security identifier of the current task and return
3237 * it in @secid. In case of failure, @secid will be set to zero.
3239 void security_current_getsecid_subj(u32
*secid
)
3242 call_void_hook(current_getsecid_subj
, secid
);
3244 EXPORT_SYMBOL(security_current_getsecid_subj
);
3247 * security_task_getsecid_obj() - Get a task's objective secid
3249 * @secid: secid value
3251 * Retrieve the objective security identifier of the task_struct in @p and
3252 * return it in @secid. In case of failure, @secid will be set to zero.
3254 void security_task_getsecid_obj(struct task_struct
*p
, u32
*secid
)
3257 call_void_hook(task_getsecid_obj
, p
, secid
);
3259 EXPORT_SYMBOL(security_task_getsecid_obj
);
3262 * security_task_setnice() - Check if setting a task's nice value is allowed
3266 * Check permission before setting the nice value of @p to @nice.
3268 * Return: Returns 0 if permission is granted.
3270 int security_task_setnice(struct task_struct
*p
, int nice
)
3272 return call_int_hook(task_setnice
, 0, p
, nice
);
3276 * security_task_setioprio() - Check if setting a task's ioprio is allowed
3278 * @ioprio: ioprio value
3280 * Check permission before setting the ioprio value of @p to @ioprio.
3282 * Return: Returns 0 if permission is granted.
3284 int security_task_setioprio(struct task_struct
*p
, int ioprio
)
3286 return call_int_hook(task_setioprio
, 0, p
, ioprio
);
3290 * security_task_getioprio() - Check if getting a task's ioprio is allowed
3293 * Check permission before getting the ioprio value of @p.
3295 * Return: Returns 0 if permission is granted.
3297 int security_task_getioprio(struct task_struct
*p
)
3299 return call_int_hook(task_getioprio
, 0, p
);
3303 * security_task_prlimit() - Check if get/setting resources limits is allowed
3304 * @cred: current task credentials
3305 * @tcred: target task credentials
3306 * @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
3308 * Check permission before getting and/or setting the resource limits of
3311 * Return: Returns 0 if permission is granted.
3313 int security_task_prlimit(const struct cred
*cred
, const struct cred
*tcred
,
3316 return call_int_hook(task_prlimit
, 0, cred
, tcred
, flags
);
3320 * security_task_setrlimit() - Check if setting a new rlimit value is allowed
3321 * @p: target task's group leader
3322 * @resource: resource whose limit is being set
3323 * @new_rlim: new resource limit
3325 * Check permission before setting the resource limits of process @p for
3326 * @resource to @new_rlim. The old resource limit values can be examined by
3327 * dereferencing (p->signal->rlim + resource).
3329 * Return: Returns 0 if permission is granted.
3331 int security_task_setrlimit(struct task_struct
*p
, unsigned int resource
,
3332 struct rlimit
*new_rlim
)
3334 return call_int_hook(task_setrlimit
, 0, p
, resource
, new_rlim
);
3338 * security_task_setscheduler() - Check if setting sched policy/param is allowed
3341 * Check permission before setting scheduling policy and/or parameters of
3344 * Return: Returns 0 if permission is granted.
3346 int security_task_setscheduler(struct task_struct
*p
)
3348 return call_int_hook(task_setscheduler
, 0, p
);
3352 * security_task_getscheduler() - Check if getting scheduling info is allowed
3355 * Check permission before obtaining scheduling information for process @p.
3357 * Return: Returns 0 if permission is granted.
3359 int security_task_getscheduler(struct task_struct
*p
)
3361 return call_int_hook(task_getscheduler
, 0, p
);
3365 * security_task_movememory() - Check if moving memory is allowed
3368 * Check permission before moving memory owned by process @p.
3370 * Return: Returns 0 if permission is granted.
3372 int security_task_movememory(struct task_struct
*p
)
3374 return call_int_hook(task_movememory
, 0, p
);
3378 * security_task_kill() - Check if sending a signal is allowed
3379 * @p: target process
3380 * @info: signal information
3381 * @sig: signal value
3382 * @cred: credentials of the signal sender, NULL if @current
3384 * Check permission before sending signal @sig to @p. @info can be NULL, the
3385 * constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
3386 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
3387 * the kernel and should typically be permitted. SIGIO signals are handled
3388 * separately by the send_sigiotask hook in file_security_ops.
3390 * Return: Returns 0 if permission is granted.
3392 int security_task_kill(struct task_struct
*p
, struct kernel_siginfo
*info
,
3393 int sig
, const struct cred
*cred
)
3395 return call_int_hook(task_kill
, 0, p
, info
, sig
, cred
);
3399 * security_task_prctl() - Check if a prctl op is allowed
3400 * @option: operation
3406 * Check permission before performing a process control operation on the
3409 * Return: Return -ENOSYS if no-one wanted to handle this op, any other value
3410 * to cause prctl() to return immediately with that value.
3412 int security_task_prctl(int option
, unsigned long arg2
, unsigned long arg3
,
3413 unsigned long arg4
, unsigned long arg5
)
3416 int rc
= LSM_RET_DEFAULT(task_prctl
);
3417 struct security_hook_list
*hp
;
3419 hlist_for_each_entry(hp
, &security_hook_heads
.task_prctl
, list
) {
3420 thisrc
= hp
->hook
.task_prctl(option
, arg2
, arg3
, arg4
, arg5
);
3421 if (thisrc
!= LSM_RET_DEFAULT(task_prctl
)) {
3431 * security_task_to_inode() - Set the security attributes of a task's inode
3435 * Set the security attributes for an inode based on an associated task's
3436 * security attributes, e.g. for /proc/pid inodes.
3438 void security_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
3440 call_void_hook(task_to_inode
, p
, inode
);
3444 * security_create_user_ns() - Check if creating a new userns is allowed
3445 * @cred: prepared creds
3447 * Check permission prior to creating a new user namespace.
3449 * Return: Returns 0 if successful, otherwise < 0 error code.
3451 int security_create_user_ns(const struct cred
*cred
)
3453 return call_int_hook(userns_create
, 0, cred
);
3457 * security_ipc_permission() - Check if sysv ipc access is allowed
3458 * @ipcp: ipc permission structure
3459 * @flag: requested permissions
3461 * Check permissions for access to IPC.
3463 * Return: Returns 0 if permission is granted.
3465 int security_ipc_permission(struct kern_ipc_perm
*ipcp
, short flag
)
3467 return call_int_hook(ipc_permission
, 0, ipcp
, flag
);
3471 * security_ipc_getsecid() - Get the sysv ipc object's secid
3472 * @ipcp: ipc permission structure
3473 * @secid: secid pointer
3475 * Get the secid associated with the ipc object. In case of failure, @secid
3476 * will be set to zero.
3478 void security_ipc_getsecid(struct kern_ipc_perm
*ipcp
, u32
*secid
)
3481 call_void_hook(ipc_getsecid
, ipcp
, secid
);
3485 * security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
3486 * @msg: message structure
3488 * Allocate and attach a security structure to the msg->security field. The
3489 * security field is initialized to NULL when the structure is first created.
3491 * Return: Return 0 if operation was successful and permission is granted.
3493 int security_msg_msg_alloc(struct msg_msg
*msg
)
3495 int rc
= lsm_msg_msg_alloc(msg
);
3499 rc
= call_int_hook(msg_msg_alloc_security
, 0, msg
);
3501 security_msg_msg_free(msg
);
3506 * security_msg_msg_free() - Free a sysv ipc message LSM blob
3507 * @msg: message structure
3509 * Deallocate the security structure for this message.
3511 void security_msg_msg_free(struct msg_msg
*msg
)
3513 call_void_hook(msg_msg_free_security
, msg
);
3514 kfree(msg
->security
);
3515 msg
->security
= NULL
;
3519 * security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
3520 * @msq: sysv ipc permission structure
3522 * Allocate and attach a security structure to @msg. The security field is
3523 * initialized to NULL when the structure is first created.
3525 * Return: Returns 0 if operation was successful and permission is granted.
3527 int security_msg_queue_alloc(struct kern_ipc_perm
*msq
)
3529 int rc
= lsm_ipc_alloc(msq
);
3533 rc
= call_int_hook(msg_queue_alloc_security
, 0, msq
);
3535 security_msg_queue_free(msq
);
3540 * security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
3541 * @msq: sysv ipc permission structure
3543 * Deallocate security field @perm->security for the message queue.
3545 void security_msg_queue_free(struct kern_ipc_perm
*msq
)
3547 call_void_hook(msg_queue_free_security
, msq
);
3548 kfree(msq
->security
);
3549 msq
->security
= NULL
;
3553 * security_msg_queue_associate() - Check if a msg queue operation is allowed
3554 * @msq: sysv ipc permission structure
3555 * @msqflg: operation flags
3557 * Check permission when a message queue is requested through the msgget system
3558 * call. This hook is only called when returning the message queue identifier
3559 * for an existing message queue, not when a new message queue is created.
3561 * Return: Return 0 if permission is granted.
3563 int security_msg_queue_associate(struct kern_ipc_perm
*msq
, int msqflg
)
3565 return call_int_hook(msg_queue_associate
, 0, msq
, msqflg
);
3569 * security_msg_queue_msgctl() - Check if a msg queue operation is allowed
3570 * @msq: sysv ipc permission structure
3573 * Check permission when a message control operation specified by @cmd is to be
3574 * performed on the message queue with permissions.
3576 * Return: Returns 0 if permission is granted.
3578 int security_msg_queue_msgctl(struct kern_ipc_perm
*msq
, int cmd
)
3580 return call_int_hook(msg_queue_msgctl
, 0, msq
, cmd
);
3584 * security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
3585 * @msq: sysv ipc permission structure
3587 * @msqflg: operation flags
3589 * Check permission before a message, @msg, is enqueued on the message queue
3590 * with permissions specified in @msq.
3592 * Return: Returns 0 if permission is granted.
3594 int security_msg_queue_msgsnd(struct kern_ipc_perm
*msq
,
3595 struct msg_msg
*msg
, int msqflg
)
3597 return call_int_hook(msg_queue_msgsnd
, 0, msq
, msg
, msqflg
);
3601 * security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
3602 * @msq: sysv ipc permission structure
3604 * @target: target task
3605 * @type: type of message requested
3606 * @mode: operation flags
3608 * Check permission before a message, @msg, is removed from the message queue.
3609 * The @target task structure contains a pointer to the process that will be
3610 * receiving the message (not equal to the current process when inline receives
3611 * are being performed).
3613 * Return: Returns 0 if permission is granted.
3615 int security_msg_queue_msgrcv(struct kern_ipc_perm
*msq
, struct msg_msg
*msg
,
3616 struct task_struct
*target
, long type
, int mode
)
3618 return call_int_hook(msg_queue_msgrcv
, 0, msq
, msg
, target
, type
, mode
);
3622 * security_shm_alloc() - Allocate a sysv shm LSM blob
3623 * @shp: sysv ipc permission structure
3625 * Allocate and attach a security structure to the @shp security field. The
3626 * security field is initialized to NULL when the structure is first created.
3628 * Return: Returns 0 if operation was successful and permission is granted.
3630 int security_shm_alloc(struct kern_ipc_perm
*shp
)
3632 int rc
= lsm_ipc_alloc(shp
);
3636 rc
= call_int_hook(shm_alloc_security
, 0, shp
);
3638 security_shm_free(shp
);
3643 * security_shm_free() - Free a sysv shm LSM blob
3644 * @shp: sysv ipc permission structure
3646 * Deallocate the security structure @perm->security for the memory segment.
3648 void security_shm_free(struct kern_ipc_perm
*shp
)
3650 call_void_hook(shm_free_security
, shp
);
3651 kfree(shp
->security
);
3652 shp
->security
= NULL
;
3656 * security_shm_associate() - Check if a sysv shm operation is allowed
3657 * @shp: sysv ipc permission structure
3658 * @shmflg: operation flags
3660 * Check permission when a shared memory region is requested through the shmget
3661 * system call. This hook is only called when returning the shared memory
3662 * region identifier for an existing region, not when a new shared memory
3663 * region is created.
3665 * Return: Returns 0 if permission is granted.
3667 int security_shm_associate(struct kern_ipc_perm
*shp
, int shmflg
)
3669 return call_int_hook(shm_associate
, 0, shp
, shmflg
);
3673 * security_shm_shmctl() - Check if a sysv shm operation is allowed
3674 * @shp: sysv ipc permission structure
3677 * Check permission when a shared memory control operation specified by @cmd is
3678 * to be performed on the shared memory region with permissions in @shp.
3680 * Return: Return 0 if permission is granted.
3682 int security_shm_shmctl(struct kern_ipc_perm
*shp
, int cmd
)
3684 return call_int_hook(shm_shmctl
, 0, shp
, cmd
);
3688 * security_shm_shmat() - Check if a sysv shm attach operation is allowed
3689 * @shp: sysv ipc permission structure
3690 * @shmaddr: address of memory region to attach
3691 * @shmflg: operation flags
3693 * Check permissions prior to allowing the shmat system call to attach the
3694 * shared memory segment with permissions @shp to the data segment of the
3695 * calling process. The attaching address is specified by @shmaddr.
3697 * Return: Returns 0 if permission is granted.
3699 int security_shm_shmat(struct kern_ipc_perm
*shp
,
3700 char __user
*shmaddr
, int shmflg
)
3702 return call_int_hook(shm_shmat
, 0, shp
, shmaddr
, shmflg
);
3706 * security_sem_alloc() - Allocate a sysv semaphore LSM blob
3707 * @sma: sysv ipc permission structure
3709 * Allocate and attach a security structure to the @sma security field. The
3710 * security field is initialized to NULL when the structure is first created.
3712 * Return: Returns 0 if operation was successful and permission is granted.
3714 int security_sem_alloc(struct kern_ipc_perm
*sma
)
3716 int rc
= lsm_ipc_alloc(sma
);
3720 rc
= call_int_hook(sem_alloc_security
, 0, sma
);
3722 security_sem_free(sma
);
3727 * security_sem_free() - Free a sysv semaphore LSM blob
3728 * @sma: sysv ipc permission structure
3730 * Deallocate security structure @sma->security for the semaphore.
3732 void security_sem_free(struct kern_ipc_perm
*sma
)
3734 call_void_hook(sem_free_security
, sma
);
3735 kfree(sma
->security
);
3736 sma
->security
= NULL
;
3740 * security_sem_associate() - Check if a sysv semaphore operation is allowed
3741 * @sma: sysv ipc permission structure
3742 * @semflg: operation flags
3744 * Check permission when a semaphore is requested through the semget system
3745 * call. This hook is only called when returning the semaphore identifier for
3746 * an existing semaphore, not when a new one must be created.
3748 * Return: Returns 0 if permission is granted.
3750 int security_sem_associate(struct kern_ipc_perm
*sma
, int semflg
)
3752 return call_int_hook(sem_associate
, 0, sma
, semflg
);
3756 * security_sem_semctl() - Check if a sysv semaphore operation is allowed
3757 * @sma: sysv ipc permission structure
3760 * Check permission when a semaphore operation specified by @cmd is to be
3761 * performed on the semaphore.
3763 * Return: Returns 0 if permission is granted.
3765 int security_sem_semctl(struct kern_ipc_perm
*sma
, int cmd
)
3767 return call_int_hook(sem_semctl
, 0, sma
, cmd
);
3771 * security_sem_semop() - Check if a sysv semaphore operation is allowed
3772 * @sma: sysv ipc permission structure
3773 * @sops: operations to perform
3774 * @nsops: number of operations
3775 * @alter: flag indicating changes will be made
3777 * Check permissions before performing operations on members of the semaphore
3778 * set. If the @alter flag is nonzero, the semaphore set may be modified.
3780 * Return: Returns 0 if permission is granted.
3782 int security_sem_semop(struct kern_ipc_perm
*sma
, struct sembuf
*sops
,
3783 unsigned nsops
, int alter
)
3785 return call_int_hook(sem_semop
, 0, sma
, sops
, nsops
, alter
);
3789 * security_d_instantiate() - Populate an inode's LSM state based on a dentry
3793 * Fill in @inode security information for a @dentry if allowed.
3795 void security_d_instantiate(struct dentry
*dentry
, struct inode
*inode
)
3797 if (unlikely(inode
&& IS_PRIVATE(inode
)))
3799 call_void_hook(d_instantiate
, dentry
, inode
);
3801 EXPORT_SYMBOL(security_d_instantiate
);
3804 * security_getprocattr() - Read an attribute for a task
3807 * @name: attribute name
3808 * @value: attribute value
3810 * Read attribute @name for task @p and store it into @value if allowed.
3812 * Return: Returns the length of @value on success, a negative value otherwise.
3814 int security_getprocattr(struct task_struct
*p
, const char *lsm
,
3815 const char *name
, char **value
)
3817 struct security_hook_list
*hp
;
3819 hlist_for_each_entry(hp
, &security_hook_heads
.getprocattr
, list
) {
3820 if (lsm
!= NULL
&& strcmp(lsm
, hp
->lsm
))
3822 return hp
->hook
.getprocattr(p
, name
, value
);
3824 return LSM_RET_DEFAULT(getprocattr
);
3828 * security_setprocattr() - Set an attribute for a task
3830 * @name: attribute name
3831 * @value: attribute value
3832 * @size: attribute value size
3834 * Write (set) the current task's attribute @name to @value, size @size if
3837 * Return: Returns bytes written on success, a negative value otherwise.
3839 int security_setprocattr(const char *lsm
, const char *name
, void *value
,
3842 struct security_hook_list
*hp
;
3844 hlist_for_each_entry(hp
, &security_hook_heads
.setprocattr
, list
) {
3845 if (lsm
!= NULL
&& strcmp(lsm
, hp
->lsm
))
3847 return hp
->hook
.setprocattr(name
, value
, size
);
3849 return LSM_RET_DEFAULT(setprocattr
);
3853 * security_netlink_send() - Save info and check if netlink sending is allowed
3854 * @sk: sending socket
3855 * @skb: netlink message
3857 * Save security information for a netlink message so that permission checking
3858 * can be performed when the message is processed. The security information
3859 * can be saved using the eff_cap field of the netlink_skb_parms structure.
3860 * Also may be used to provide fine grained control over message transmission.
3862 * Return: Returns 0 if the information was successfully saved and message is
3863 * allowed to be transmitted.
3865 int security_netlink_send(struct sock
*sk
, struct sk_buff
*skb
)
3867 return call_int_hook(netlink_send
, 0, sk
, skb
);
3871 * security_ismaclabel() - Check is the named attribute is a MAC label
3872 * @name: full extended attribute name
3874 * Check if the extended attribute specified by @name represents a MAC label.
3876 * Return: Returns 1 if name is a MAC attribute otherwise returns 0.
3878 int security_ismaclabel(const char *name
)
3880 return call_int_hook(ismaclabel
, 0, name
);
3882 EXPORT_SYMBOL(security_ismaclabel
);
3885 * security_secid_to_secctx() - Convert a secid to a secctx
3888 * @seclen: secctx length
3890 * Convert secid to security context. If @secdata is NULL the length of the
3891 * result will be returned in @seclen, but no @secdata will be returned. This
3892 * does mean that the length could change between calls to check the length and
3893 * the next call which actually allocates and returns the @secdata.
3895 * Return: Return 0 on success, error on failure.
3897 int security_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
3899 struct security_hook_list
*hp
;
3903 * Currently, only one LSM can implement secid_to_secctx (i.e this
3904 * LSM hook is not "stackable").
3906 hlist_for_each_entry(hp
, &security_hook_heads
.secid_to_secctx
, list
) {
3907 rc
= hp
->hook
.secid_to_secctx(secid
, secdata
, seclen
);
3908 if (rc
!= LSM_RET_DEFAULT(secid_to_secctx
))
3912 return LSM_RET_DEFAULT(secid_to_secctx
);
3914 EXPORT_SYMBOL(security_secid_to_secctx
);
3917 * security_secctx_to_secid() - Convert a secctx to a secid
3919 * @seclen: length of secctx
3922 * Convert security context to secid.
3924 * Return: Returns 0 on success, error on failure.
3926 int security_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
3929 return call_int_hook(secctx_to_secid
, 0, secdata
, seclen
, secid
);
3931 EXPORT_SYMBOL(security_secctx_to_secid
);
3934 * security_release_secctx() - Free a secctx buffer
3936 * @seclen: length of secctx
3938 * Release the security context.
3940 void security_release_secctx(char *secdata
, u32 seclen
)
3942 call_void_hook(release_secctx
, secdata
, seclen
);
3944 EXPORT_SYMBOL(security_release_secctx
);
3947 * security_inode_invalidate_secctx() - Invalidate an inode's security label
3950 * Notify the security module that it must revalidate the security context of
3953 void security_inode_invalidate_secctx(struct inode
*inode
)
3955 call_void_hook(inode_invalidate_secctx
, inode
);
3957 EXPORT_SYMBOL(security_inode_invalidate_secctx
);
3960 * security_inode_notifysecctx() - Notify the LSM of an inode's security label
3963 * @ctxlen: length of secctx
3965 * Notify the security module of what the security context of an inode should
3966 * be. Initializes the incore security context managed by the security module
3967 * for this inode. Example usage: NFS client invokes this hook to initialize
3968 * the security context in its incore inode to the value provided by the server
3969 * for the file when the server returned the file's attributes to the client.
3970 * Must be called with inode->i_mutex locked.
3972 * Return: Returns 0 on success, error on failure.
3974 int security_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
3976 return call_int_hook(inode_notifysecctx
, 0, inode
, ctx
, ctxlen
);
3978 EXPORT_SYMBOL(security_inode_notifysecctx
);
3981 * security_inode_setsecctx() - Change the security label of an inode
3984 * @ctxlen: length of secctx
3986 * Change the security context of an inode. Updates the incore security
3987 * context managed by the security module and invokes the fs code as needed
3988 * (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
3989 * context. Example usage: NFS server invokes this hook to change the security
3990 * context in its incore inode and on the backing filesystem to a value
3991 * provided by the client on a SETATTR operation. Must be called with
3992 * inode->i_mutex locked.
3994 * Return: Returns 0 on success, error on failure.
3996 int security_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
3998 return call_int_hook(inode_setsecctx
, 0, dentry
, ctx
, ctxlen
);
4000 EXPORT_SYMBOL(security_inode_setsecctx
);
4003 * security_inode_getsecctx() - Get the security label of an inode
4006 * @ctxlen: length of secctx
4008 * On success, returns 0 and fills out @ctx and @ctxlen with the security
4009 * context for the given @inode.
4011 * Return: Returns 0 on success, error on failure.
4013 int security_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4015 return call_int_hook(inode_getsecctx
, -EOPNOTSUPP
, inode
, ctx
, ctxlen
);
4017 EXPORT_SYMBOL(security_inode_getsecctx
);
4019 #ifdef CONFIG_WATCH_QUEUE
4021 * security_post_notification() - Check if a watch notification can be posted
4022 * @w_cred: credentials of the task that set the watch
4023 * @cred: credentials of the task which triggered the watch
4024 * @n: the notification
4026 * Check to see if a watch notification can be posted to a particular queue.
4028 * Return: Returns 0 if permission is granted.
4030 int security_post_notification(const struct cred
*w_cred
,
4031 const struct cred
*cred
,
4032 struct watch_notification
*n
)
4034 return call_int_hook(post_notification
, 0, w_cred
, cred
, n
);
4036 #endif /* CONFIG_WATCH_QUEUE */
4038 #ifdef CONFIG_KEY_NOTIFICATIONS
4040 * security_watch_key() - Check if a task is allowed to watch for key events
4041 * @key: the key to watch
4043 * Check to see if a process is allowed to watch for event notifications from
4046 * Return: Returns 0 if permission is granted.
4048 int security_watch_key(struct key
*key
)
4050 return call_int_hook(watch_key
, 0, key
);
4052 #endif /* CONFIG_KEY_NOTIFICATIONS */
4054 #ifdef CONFIG_SECURITY_NETWORK
4056 * security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
4057 * @sock: originating sock
4061 * Check permissions before establishing a Unix domain stream connection
4062 * between @sock and @other.
4064 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4065 * Linux provides an alternative to the conventional file name space for Unix
4066 * domain sockets. Whereas binding and connecting to sockets in the file name
4067 * space is mediated by the typical file permissions (and caught by the mknod
4068 * and permission hooks in inode_security_ops), binding and connecting to
4069 * sockets in the abstract name space is completely unmediated. Sufficient
4070 * control of Unix domain sockets in the abstract name space isn't possible
4071 * using only the socket layer hooks, since we need to know the actual target
4072 * socket, which is not looked up until we are inside the af_unix code.
4074 * Return: Returns 0 if permission is granted.
4076 int security_unix_stream_connect(struct sock
*sock
, struct sock
*other
,
4079 return call_int_hook(unix_stream_connect
, 0, sock
, other
, newsk
);
4081 EXPORT_SYMBOL(security_unix_stream_connect
);
4084 * security_unix_may_send() - Check if AF_UNIX socket can send datagrams
4085 * @sock: originating sock
4088 * Check permissions before connecting or sending datagrams from @sock to
4091 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4092 * Linux provides an alternative to the conventional file name space for Unix
4093 * domain sockets. Whereas binding and connecting to sockets in the file name
4094 * space is mediated by the typical file permissions (and caught by the mknod
4095 * and permission hooks in inode_security_ops), binding and connecting to
4096 * sockets in the abstract name space is completely unmediated. Sufficient
4097 * control of Unix domain sockets in the abstract name space isn't possible
4098 * using only the socket layer hooks, since we need to know the actual target
4099 * socket, which is not looked up until we are inside the af_unix code.
4101 * Return: Returns 0 if permission is granted.
4103 int security_unix_may_send(struct socket
*sock
, struct socket
*other
)
4105 return call_int_hook(unix_may_send
, 0, sock
, other
);
4107 EXPORT_SYMBOL(security_unix_may_send
);
4110 * security_socket_create() - Check if creating a new socket is allowed
4111 * @family: protocol family
4112 * @type: communications type
4113 * @protocol: requested protocol
4114 * @kern: set to 1 if a kernel socket is requested
4116 * Check permissions prior to creating a new socket.
4118 * Return: Returns 0 if permission is granted.
4120 int security_socket_create(int family
, int type
, int protocol
, int kern
)
4122 return call_int_hook(socket_create
, 0, family
, type
, protocol
, kern
);
4126 * security_socket_post_create() - Initialize a newly created socket
4128 * @family: protocol family
4129 * @type: communications type
4130 * @protocol: requested protocol
4131 * @kern: set to 1 if a kernel socket is requested
4133 * This hook allows a module to update or allocate a per-socket security
4134 * structure. Note that the security field was not added directly to the socket
4135 * structure, but rather, the socket security information is stored in the
4136 * associated inode. Typically, the inode alloc_security hook will allocate
4137 * and attach security information to SOCK_INODE(sock)->i_security. This hook
4138 * may be used to update the SOCK_INODE(sock)->i_security field with additional
4139 * information that wasn't available when the inode was allocated.
4141 * Return: Returns 0 if permission is granted.
4143 int security_socket_post_create(struct socket
*sock
, int family
,
4144 int type
, int protocol
, int kern
)
4146 return call_int_hook(socket_post_create
, 0, sock
, family
, type
,
4151 * security_socket_socketpair() - Check if creating a socketpair is allowed
4152 * @socka: first socket
4153 * @sockb: second socket
4155 * Check permissions before creating a fresh pair of sockets.
4157 * Return: Returns 0 if permission is granted and the connection was
4160 int security_socket_socketpair(struct socket
*socka
, struct socket
*sockb
)
4162 return call_int_hook(socket_socketpair
, 0, socka
, sockb
);
4164 EXPORT_SYMBOL(security_socket_socketpair
);
4167 * security_socket_bind() - Check if a socket bind operation is allowed
4169 * @address: requested bind address
4170 * @addrlen: length of address
4172 * Check permission before socket protocol layer bind operation is performed
4173 * and the socket @sock is bound to the address specified in the @address
4176 * Return: Returns 0 if permission is granted.
4178 int security_socket_bind(struct socket
*sock
,
4179 struct sockaddr
*address
, int addrlen
)
4181 return call_int_hook(socket_bind
, 0, sock
, address
, addrlen
);
4185 * security_socket_connect() - Check if a socket connect operation is allowed
4187 * @address: address of remote connection point
4188 * @addrlen: length of address
4190 * Check permission before socket protocol layer connect operation attempts to
4191 * connect socket @sock to a remote address, @address.
4193 * Return: Returns 0 if permission is granted.
4195 int security_socket_connect(struct socket
*sock
,
4196 struct sockaddr
*address
, int addrlen
)
4198 return call_int_hook(socket_connect
, 0, sock
, address
, addrlen
);
4202 * security_socket_listen() - Check if a socket is allowed to listen
4204 * @backlog: connection queue size
4206 * Check permission before socket protocol layer listen operation.
4208 * Return: Returns 0 if permission is granted.
4210 int security_socket_listen(struct socket
*sock
, int backlog
)
4212 return call_int_hook(socket_listen
, 0, sock
, backlog
);
4216 * security_socket_accept() - Check if a socket is allowed to accept connections
4217 * @sock: listening socket
4218 * @newsock: newly creation connection socket
4220 * Check permission before accepting a new connection. Note that the new
4221 * socket, @newsock, has been created and some information copied to it, but
4222 * the accept operation has not actually been performed.
4224 * Return: Returns 0 if permission is granted.
4226 int security_socket_accept(struct socket
*sock
, struct socket
*newsock
)
4228 return call_int_hook(socket_accept
, 0, sock
, newsock
);
4232 * security_socket_sendmsg() - Check is sending a message is allowed
4233 * @sock: sending socket
4234 * @msg: message to send
4235 * @size: size of message
4237 * Check permission before transmitting a message to another socket.
4239 * Return: Returns 0 if permission is granted.
4241 int security_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
, int size
)
4243 return call_int_hook(socket_sendmsg
, 0, sock
, msg
, size
);
4247 * security_socket_recvmsg() - Check if receiving a message is allowed
4248 * @sock: receiving socket
4249 * @msg: message to receive
4250 * @size: size of message
4251 * @flags: operational flags
4253 * Check permission before receiving a message from a socket.
4255 * Return: Returns 0 if permission is granted.
4257 int security_socket_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
4258 int size
, int flags
)
4260 return call_int_hook(socket_recvmsg
, 0, sock
, msg
, size
, flags
);
4264 * security_socket_getsockname() - Check if reading the socket addr is allowed
4267 * Check permission before reading the local address (name) of the socket
4270 * Return: Returns 0 if permission is granted.
4272 int security_socket_getsockname(struct socket
*sock
)
4274 return call_int_hook(socket_getsockname
, 0, sock
);
4278 * security_socket_getpeername() - Check if reading the peer's addr is allowed
4281 * Check permission before the remote address (name) of a socket object.
4283 * Return: Returns 0 if permission is granted.
4285 int security_socket_getpeername(struct socket
*sock
)
4287 return call_int_hook(socket_getpeername
, 0, sock
);
4291 * security_socket_getsockopt() - Check if reading a socket option is allowed
4293 * @level: option's protocol level
4294 * @optname: option name
4296 * Check permissions before retrieving the options associated with socket
4299 * Return: Returns 0 if permission is granted.
4301 int security_socket_getsockopt(struct socket
*sock
, int level
, int optname
)
4303 return call_int_hook(socket_getsockopt
, 0, sock
, level
, optname
);
4307 * security_socket_setsockopt() - Check if setting a socket option is allowed
4309 * @level: option's protocol level
4310 * @optname: option name
4312 * Check permissions before setting the options associated with socket @sock.
4314 * Return: Returns 0 if permission is granted.
4316 int security_socket_setsockopt(struct socket
*sock
, int level
, int optname
)
4318 return call_int_hook(socket_setsockopt
, 0, sock
, level
, optname
);
4322 * security_socket_shutdown() - Checks if shutting down the socket is allowed
4324 * @how: flag indicating how sends and receives are handled
4326 * Checks permission before all or part of a connection on the socket @sock is
4329 * Return: Returns 0 if permission is granted.
4331 int security_socket_shutdown(struct socket
*sock
, int how
)
4333 return call_int_hook(socket_shutdown
, 0, sock
, how
);
4337 * security_sock_rcv_skb() - Check if an incoming network packet is allowed
4338 * @sk: destination sock
4339 * @skb: incoming packet
4341 * Check permissions on incoming network packets. This hook is distinct from
4342 * Netfilter's IP input hooks since it is the first time that the incoming
4343 * sk_buff @skb has been associated with a particular socket, @sk. Must not
4344 * sleep inside this hook because some callers hold spinlocks.
4346 * Return: Returns 0 if permission is granted.
4348 int security_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
4350 return call_int_hook(socket_sock_rcv_skb
, 0, sk
, skb
);
4352 EXPORT_SYMBOL(security_sock_rcv_skb
);
4355 * security_socket_getpeersec_stream() - Get the remote peer label
4357 * @optval: destination buffer
4358 * @optlen: size of peer label copied into the buffer
4359 * @len: maximum size of the destination buffer
4361 * This hook allows the security module to provide peer socket security state
4362 * for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
4363 * For tcp sockets this can be meaningful if the socket is associated with an
4366 * Return: Returns 0 if all is well, otherwise, typical getsockopt return
4369 int security_socket_getpeersec_stream(struct socket
*sock
, sockptr_t optval
,
4370 sockptr_t optlen
, unsigned int len
)
4372 return call_int_hook(socket_getpeersec_stream
, -ENOPROTOOPT
, sock
,
4373 optval
, optlen
, len
);
4377 * security_socket_getpeersec_dgram() - Get the remote peer label
4379 * @skb: datagram packet
4380 * @secid: remote peer label secid
4382 * This hook allows the security module to provide peer socket security state
4383 * for udp sockets on a per-packet basis to userspace via getsockopt
4384 * SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
4385 * option via getsockopt. It can then retrieve the security state returned by
4386 * this hook for a packet via the SCM_SECURITY ancillary message type.
4388 * Return: Returns 0 on success, error on failure.
4390 int security_socket_getpeersec_dgram(struct socket
*sock
,
4391 struct sk_buff
*skb
, u32
*secid
)
4393 return call_int_hook(socket_getpeersec_dgram
, -ENOPROTOOPT
, sock
,
4396 EXPORT_SYMBOL(security_socket_getpeersec_dgram
);
4399 * security_sk_alloc() - Allocate and initialize a sock's LSM blob
4401 * @family: protocol family
4402 * @priority: gfp flags
4404 * Allocate and attach a security structure to the sk->sk_security field, which
4405 * is used to copy security attributes between local stream sockets.
4407 * Return: Returns 0 on success, error on failure.
4409 int security_sk_alloc(struct sock
*sk
, int family
, gfp_t priority
)
4411 return call_int_hook(sk_alloc_security
, 0, sk
, family
, priority
);
4415 * security_sk_free() - Free the sock's LSM blob
4418 * Deallocate security structure.
4420 void security_sk_free(struct sock
*sk
)
4422 call_void_hook(sk_free_security
, sk
);
4426 * security_sk_clone() - Clone a sock's LSM state
4427 * @sk: original sock
4428 * @newsk: target sock
4430 * Clone/copy security structure.
4432 void security_sk_clone(const struct sock
*sk
, struct sock
*newsk
)
4434 call_void_hook(sk_clone_security
, sk
, newsk
);
4436 EXPORT_SYMBOL(security_sk_clone
);
4439 * security_sk_classify_flow() - Set a flow's secid based on socket
4440 * @sk: original socket
4441 * @flic: target flow
4443 * Set the target flow's secid to socket's secid.
4445 void security_sk_classify_flow(const struct sock
*sk
, struct flowi_common
*flic
)
4447 call_void_hook(sk_getsecid
, sk
, &flic
->flowic_secid
);
4449 EXPORT_SYMBOL(security_sk_classify_flow
);
4452 * security_req_classify_flow() - Set a flow's secid based on request_sock
4453 * @req: request_sock
4454 * @flic: target flow
4456 * Sets @flic's secid to @req's secid.
4458 void security_req_classify_flow(const struct request_sock
*req
,
4459 struct flowi_common
*flic
)
4461 call_void_hook(req_classify_flow
, req
, flic
);
4463 EXPORT_SYMBOL(security_req_classify_flow
);
4466 * security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
4467 * @sk: sock being grafted
4468 * @parent: target parent socket
4470 * Sets @parent's inode secid to @sk's secid and update @sk with any necessary
4471 * LSM state from @parent.
4473 void security_sock_graft(struct sock
*sk
, struct socket
*parent
)
4475 call_void_hook(sock_graft
, sk
, parent
);
4477 EXPORT_SYMBOL(security_sock_graft
);
4480 * security_inet_conn_request() - Set request_sock state using incoming connect
4481 * @sk: parent listening sock
4482 * @skb: incoming connection
4483 * @req: new request_sock
4485 * Initialize the @req LSM state based on @sk and the incoming connect in @skb.
4487 * Return: Returns 0 if permission is granted.
4489 int security_inet_conn_request(const struct sock
*sk
,
4490 struct sk_buff
*skb
, struct request_sock
*req
)
4492 return call_int_hook(inet_conn_request
, 0, sk
, skb
, req
);
4494 EXPORT_SYMBOL(security_inet_conn_request
);
4497 * security_inet_csk_clone() - Set new sock LSM state based on request_sock
4499 * @req: connection request_sock
4501 * Set that LSM state of @sock using the LSM state from @req.
4503 void security_inet_csk_clone(struct sock
*newsk
,
4504 const struct request_sock
*req
)
4506 call_void_hook(inet_csk_clone
, newsk
, req
);
4510 * security_inet_conn_established() - Update sock's LSM state with connection
4512 * @skb: connection packet
4514 * Update @sock's LSM state to represent a new connection from @skb.
4516 void security_inet_conn_established(struct sock
*sk
,
4517 struct sk_buff
*skb
)
4519 call_void_hook(inet_conn_established
, sk
, skb
);
4521 EXPORT_SYMBOL(security_inet_conn_established
);
4524 * security_secmark_relabel_packet() - Check if setting a secmark is allowed
4525 * @secid: new secmark value
4527 * Check if the process should be allowed to relabel packets to @secid.
4529 * Return: Returns 0 if permission is granted.
4531 int security_secmark_relabel_packet(u32 secid
)
4533 return call_int_hook(secmark_relabel_packet
, 0, secid
);
4535 EXPORT_SYMBOL(security_secmark_relabel_packet
);
4538 * security_secmark_refcount_inc() - Increment the secmark labeling rule count
4540 * Tells the LSM to increment the number of secmark labeling rules loaded.
4542 void security_secmark_refcount_inc(void)
4544 call_void_hook(secmark_refcount_inc
);
4546 EXPORT_SYMBOL(security_secmark_refcount_inc
);
4549 * security_secmark_refcount_dec() - Decrement the secmark labeling rule count
4551 * Tells the LSM to decrement the number of secmark labeling rules loaded.
4553 void security_secmark_refcount_dec(void)
4555 call_void_hook(secmark_refcount_dec
);
4557 EXPORT_SYMBOL(security_secmark_refcount_dec
);
4560 * security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
4561 * @security: pointer to the LSM blob
4563 * This hook allows a module to allocate a security structure for a TUN device,
4564 * returning the pointer in @security.
4566 * Return: Returns a zero on success, negative values on failure.
4568 int security_tun_dev_alloc_security(void **security
)
4570 return call_int_hook(tun_dev_alloc_security
, 0, security
);
4572 EXPORT_SYMBOL(security_tun_dev_alloc_security
);
4575 * security_tun_dev_free_security() - Free a TUN device LSM blob
4576 * @security: LSM blob
4578 * This hook allows a module to free the security structure for a TUN device.
4580 void security_tun_dev_free_security(void *security
)
4582 call_void_hook(tun_dev_free_security
, security
);
4584 EXPORT_SYMBOL(security_tun_dev_free_security
);
4587 * security_tun_dev_create() - Check if creating a TUN device is allowed
4589 * Check permissions prior to creating a new TUN device.
4591 * Return: Returns 0 if permission is granted.
4593 int security_tun_dev_create(void)
4595 return call_int_hook(tun_dev_create
, 0);
4597 EXPORT_SYMBOL(security_tun_dev_create
);
4600 * security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
4601 * @security: TUN device LSM blob
4603 * Check permissions prior to attaching to a TUN device queue.
4605 * Return: Returns 0 if permission is granted.
4607 int security_tun_dev_attach_queue(void *security
)
4609 return call_int_hook(tun_dev_attach_queue
, 0, security
);
4611 EXPORT_SYMBOL(security_tun_dev_attach_queue
);
4614 * security_tun_dev_attach() - Update TUN device LSM state on attach
4615 * @sk: associated sock
4616 * @security: TUN device LSM blob
4618 * This hook can be used by the module to update any security state associated
4619 * with the TUN device's sock structure.
4621 * Return: Returns 0 if permission is granted.
4623 int security_tun_dev_attach(struct sock
*sk
, void *security
)
4625 return call_int_hook(tun_dev_attach
, 0, sk
, security
);
4627 EXPORT_SYMBOL(security_tun_dev_attach
);
4630 * security_tun_dev_open() - Update TUN device LSM state on open
4631 * @security: TUN device LSM blob
4633 * This hook can be used by the module to update any security state associated
4634 * with the TUN device's security structure.
4636 * Return: Returns 0 if permission is granted.
4638 int security_tun_dev_open(void *security
)
4640 return call_int_hook(tun_dev_open
, 0, security
);
4642 EXPORT_SYMBOL(security_tun_dev_open
);
4645 * security_sctp_assoc_request() - Update the LSM on a SCTP association req
4646 * @asoc: SCTP association
4647 * @skb: packet requesting the association
4649 * Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
4651 * Return: Returns 0 on success, error on failure.
4653 int security_sctp_assoc_request(struct sctp_association
*asoc
,
4654 struct sk_buff
*skb
)
4656 return call_int_hook(sctp_assoc_request
, 0, asoc
, skb
);
4658 EXPORT_SYMBOL(security_sctp_assoc_request
);
4661 * security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
4663 * @optname: SCTP option to validate
4664 * @address: list of IP addresses to validate
4665 * @addrlen: length of the address list
4667 * Validiate permissions required for each address associated with sock @sk.
4668 * Depending on @optname, the addresses will be treated as either a connect or
4669 * bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
4670 * sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
4672 * Return: Returns 0 on success, error on failure.
4674 int security_sctp_bind_connect(struct sock
*sk
, int optname
,
4675 struct sockaddr
*address
, int addrlen
)
4677 return call_int_hook(sctp_bind_connect
, 0, sk
, optname
,
4680 EXPORT_SYMBOL(security_sctp_bind_connect
);
4683 * security_sctp_sk_clone() - Clone a SCTP sock's LSM state
4684 * @asoc: SCTP association
4685 * @sk: original sock
4686 * @newsk: target sock
4688 * Called whenever a new socket is created by accept(2) (i.e. a TCP style
4689 * socket) or when a socket is 'peeled off' e.g userspace calls
4692 void security_sctp_sk_clone(struct sctp_association
*asoc
, struct sock
*sk
,
4695 call_void_hook(sctp_sk_clone
, asoc
, sk
, newsk
);
4697 EXPORT_SYMBOL(security_sctp_sk_clone
);
4700 * security_sctp_assoc_established() - Update LSM state when assoc established
4701 * @asoc: SCTP association
4702 * @skb: packet establishing the association
4704 * Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
4707 * Return: Returns 0 if permission is granted.
4709 int security_sctp_assoc_established(struct sctp_association
*asoc
,
4710 struct sk_buff
*skb
)
4712 return call_int_hook(sctp_assoc_established
, 0, asoc
, skb
);
4714 EXPORT_SYMBOL(security_sctp_assoc_established
);
4717 * security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
4718 * @sk: the owning MPTCP socket
4719 * @ssk: the new subflow
4721 * Update the labeling for the given MPTCP subflow, to match the one of the
4722 * owning MPTCP socket. This hook has to be called after the socket creation and
4723 * initialization via the security_socket_create() and
4724 * security_socket_post_create() LSM hooks.
4726 * Return: Returns 0 on success or a negative error code on failure.
4728 int security_mptcp_add_subflow(struct sock
*sk
, struct sock
*ssk
)
4730 return call_int_hook(mptcp_add_subflow
, 0, sk
, ssk
);
4733 #endif /* CONFIG_SECURITY_NETWORK */
4735 #ifdef CONFIG_SECURITY_INFINIBAND
4737 * security_ib_pkey_access() - Check if access to an IB pkey is allowed
4739 * @subnet_prefix: subnet prefix of the port
4742 * Check permission to access a pkey when modifying a QP.
4744 * Return: Returns 0 if permission is granted.
4746 int security_ib_pkey_access(void *sec
, u64 subnet_prefix
, u16 pkey
)
4748 return call_int_hook(ib_pkey_access
, 0, sec
, subnet_prefix
, pkey
);
4750 EXPORT_SYMBOL(security_ib_pkey_access
);
4753 * security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
4755 * @dev_name: IB device name
4756 * @port_num: port number
4758 * Check permissions to send and receive SMPs on a end port.
4760 * Return: Returns 0 if permission is granted.
4762 int security_ib_endport_manage_subnet(void *sec
,
4763 const char *dev_name
, u8 port_num
)
4765 return call_int_hook(ib_endport_manage_subnet
, 0, sec
,
4766 dev_name
, port_num
);
4768 EXPORT_SYMBOL(security_ib_endport_manage_subnet
);
4771 * security_ib_alloc_security() - Allocate an Infiniband LSM blob
4774 * Allocate a security structure for Infiniband objects.
4776 * Return: Returns 0 on success, non-zero on failure.
4778 int security_ib_alloc_security(void **sec
)
4780 return call_int_hook(ib_alloc_security
, 0, sec
);
4782 EXPORT_SYMBOL(security_ib_alloc_security
);
4785 * security_ib_free_security() - Free an Infiniband LSM blob
4788 * Deallocate an Infiniband security structure.
4790 void security_ib_free_security(void *sec
)
4792 call_void_hook(ib_free_security
, sec
);
4794 EXPORT_SYMBOL(security_ib_free_security
);
4795 #endif /* CONFIG_SECURITY_INFINIBAND */
4797 #ifdef CONFIG_SECURITY_NETWORK_XFRM
4799 * security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
4800 * @ctxp: xfrm security context being added to the SPD
4801 * @sec_ctx: security label provided by userspace
4804 * Allocate a security structure to the xp->security field; the security field
4805 * is initialized to NULL when the xfrm_policy is allocated.
4807 * Return: Return 0 if operation was successful.
4809 int security_xfrm_policy_alloc(struct xfrm_sec_ctx
**ctxp
,
4810 struct xfrm_user_sec_ctx
*sec_ctx
,
4813 return call_int_hook(xfrm_policy_alloc_security
, 0, ctxp
, sec_ctx
, gfp
);
4815 EXPORT_SYMBOL(security_xfrm_policy_alloc
);
4818 * security_xfrm_policy_clone() - Clone xfrm policy LSM state
4819 * @old_ctx: xfrm security context
4820 * @new_ctxp: target xfrm security context
4822 * Allocate a security structure in new_ctxp that contains the information from
4823 * the old_ctx structure.
4825 * Return: Return 0 if operation was successful.
4827 int security_xfrm_policy_clone(struct xfrm_sec_ctx
*old_ctx
,
4828 struct xfrm_sec_ctx
**new_ctxp
)
4830 return call_int_hook(xfrm_policy_clone_security
, 0, old_ctx
, new_ctxp
);
4834 * security_xfrm_policy_free() - Free a xfrm security context
4835 * @ctx: xfrm security context
4837 * Free LSM resources associated with @ctx.
4839 void security_xfrm_policy_free(struct xfrm_sec_ctx
*ctx
)
4841 call_void_hook(xfrm_policy_free_security
, ctx
);
4843 EXPORT_SYMBOL(security_xfrm_policy_free
);
4846 * security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
4847 * @ctx: xfrm security context
4849 * Authorize deletion of a SPD entry.
4851 * Return: Returns 0 if permission is granted.
4853 int security_xfrm_policy_delete(struct xfrm_sec_ctx
*ctx
)
4855 return call_int_hook(xfrm_policy_delete_security
, 0, ctx
);
4859 * security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
4860 * @x: xfrm state being added to the SAD
4861 * @sec_ctx: security label provided by userspace
4863 * Allocate a security structure to the @x->security field; the security field
4864 * is initialized to NULL when the xfrm_state is allocated. Set the context to
4865 * correspond to @sec_ctx.
4867 * Return: Return 0 if operation was successful.
4869 int security_xfrm_state_alloc(struct xfrm_state
*x
,
4870 struct xfrm_user_sec_ctx
*sec_ctx
)
4872 return call_int_hook(xfrm_state_alloc
, 0, x
, sec_ctx
);
4874 EXPORT_SYMBOL(security_xfrm_state_alloc
);
4877 * security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
4878 * @x: xfrm state being added to the SAD
4879 * @polsec: associated policy's security context
4880 * @secid: secid from the flow
4882 * Allocate a security structure to the x->security field; the security field
4883 * is initialized to NULL when the xfrm_state is allocated. Set the context to
4884 * correspond to secid.
4886 * Return: Returns 0 if operation was successful.
4888 int security_xfrm_state_alloc_acquire(struct xfrm_state
*x
,
4889 struct xfrm_sec_ctx
*polsec
, u32 secid
)
4891 return call_int_hook(xfrm_state_alloc_acquire
, 0, x
, polsec
, secid
);
4895 * security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
4898 * Authorize deletion of x->security.
4900 * Return: Returns 0 if permission is granted.
4902 int security_xfrm_state_delete(struct xfrm_state
*x
)
4904 return call_int_hook(xfrm_state_delete_security
, 0, x
);
4906 EXPORT_SYMBOL(security_xfrm_state_delete
);
4909 * security_xfrm_state_free() - Free a xfrm state
4912 * Deallocate x->security.
4914 void security_xfrm_state_free(struct xfrm_state
*x
)
4916 call_void_hook(xfrm_state_free_security
, x
);
4920 * security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
4921 * @ctx: target xfrm security context
4922 * @fl_secid: flow secid used to authorize access
4924 * Check permission when a flow selects a xfrm_policy for processing XFRMs on a
4925 * packet. The hook is called when selecting either a per-socket policy or a
4926 * generic xfrm policy.
4928 * Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
4931 int security_xfrm_policy_lookup(struct xfrm_sec_ctx
*ctx
, u32 fl_secid
)
4933 return call_int_hook(xfrm_policy_lookup
, 0, ctx
, fl_secid
);
4937 * security_xfrm_state_pol_flow_match() - Check for a xfrm match
4938 * @x: xfrm state to match
4939 * @xp: xfrm policy to check for a match
4940 * @flic: flow to check for a match.
4942 * Check @xp and @flic for a match with @x.
4944 * Return: Returns 1 if there is a match.
4946 int security_xfrm_state_pol_flow_match(struct xfrm_state
*x
,
4947 struct xfrm_policy
*xp
,
4948 const struct flowi_common
*flic
)
4950 struct security_hook_list
*hp
;
4951 int rc
= LSM_RET_DEFAULT(xfrm_state_pol_flow_match
);
4954 * Since this function is expected to return 0 or 1, the judgment
4955 * becomes difficult if multiple LSMs supply this call. Fortunately,
4956 * we can use the first LSM's judgment because currently only SELinux
4957 * supplies this call.
4959 * For speed optimization, we explicitly break the loop rather than
4962 hlist_for_each_entry(hp
, &security_hook_heads
.xfrm_state_pol_flow_match
,
4964 rc
= hp
->hook
.xfrm_state_pol_flow_match(x
, xp
, flic
);
4971 * security_xfrm_decode_session() - Determine the xfrm secid for a packet
4975 * Decode the packet in @skb and return the security label in @secid.
4977 * Return: Return 0 if all xfrms used have the same secid.
4979 int security_xfrm_decode_session(struct sk_buff
*skb
, u32
*secid
)
4981 return call_int_hook(xfrm_decode_session
, 0, skb
, secid
, 1);
4984 void security_skb_classify_flow(struct sk_buff
*skb
, struct flowi_common
*flic
)
4986 int rc
= call_int_hook(xfrm_decode_session
, 0, skb
, &flic
->flowic_secid
,
4991 EXPORT_SYMBOL(security_skb_classify_flow
);
4992 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
4996 * security_key_alloc() - Allocate and initialize a kernel key LSM blob
4998 * @cred: credentials
4999 * @flags: allocation flags
5001 * Permit allocation of a key and assign security data. Note that key does not
5002 * have a serial number assigned at this point.
5004 * Return: Return 0 if permission is granted, -ve error otherwise.
5006 int security_key_alloc(struct key
*key
, const struct cred
*cred
,
5007 unsigned long flags
)
5009 return call_int_hook(key_alloc
, 0, key
, cred
, flags
);
5013 * security_key_free() - Free a kernel key LSM blob
5016 * Notification of destruction; free security data.
5018 void security_key_free(struct key
*key
)
5020 call_void_hook(key_free
, key
);
5024 * security_key_permission() - Check if a kernel key operation is allowed
5025 * @key_ref: key reference
5026 * @cred: credentials of actor requesting access
5027 * @need_perm: requested permissions
5029 * See whether a specific operational right is granted to a process on a key.
5031 * Return: Return 0 if permission is granted, -ve error otherwise.
5033 int security_key_permission(key_ref_t key_ref
, const struct cred
*cred
,
5034 enum key_need_perm need_perm
)
5036 return call_int_hook(key_permission
, 0, key_ref
, cred
, need_perm
);
5040 * security_key_getsecurity() - Get the key's security label
5042 * @buffer: security label buffer
5044 * Get a textual representation of the security context attached to a key for
5045 * the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
5046 * storage for the NUL-terminated string and the caller should free it.
5048 * Return: Returns the length of @buffer (including terminating NUL) or -ve if
5049 * an error occurs. May also return 0 (and a NULL buffer pointer) if
5050 * there is no security label assigned to the key.
5052 int security_key_getsecurity(struct key
*key
, char **buffer
)
5055 return call_int_hook(key_getsecurity
, 0, key
, buffer
);
5057 #endif /* CONFIG_KEYS */
5061 * security_audit_rule_init() - Allocate and init an LSM audit rule struct
5062 * @field: audit action
5063 * @op: rule operator
5064 * @rulestr: rule context
5065 * @lsmrule: receive buffer for audit rule struct
5067 * Allocate and initialize an LSM audit rule structure.
5069 * Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
5072 int security_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **lsmrule
)
5074 return call_int_hook(audit_rule_init
, 0, field
, op
, rulestr
, lsmrule
);
5078 * security_audit_rule_known() - Check if an audit rule contains LSM fields
5079 * @krule: audit rule
5081 * Specifies whether given @krule contains any fields related to the current
5084 * Return: Returns 1 in case of relation found, 0 otherwise.
5086 int security_audit_rule_known(struct audit_krule
*krule
)
5088 return call_int_hook(audit_rule_known
, 0, krule
);
5092 * security_audit_rule_free() - Free an LSM audit rule struct
5093 * @lsmrule: audit rule struct
5095 * Deallocate the LSM audit rule structure previously allocated by
5096 * audit_rule_init().
5098 void security_audit_rule_free(void *lsmrule
)
5100 call_void_hook(audit_rule_free
, lsmrule
);
5104 * security_audit_rule_match() - Check if a label matches an audit rule
5105 * @secid: security label
5106 * @field: LSM audit field
5107 * @op: matching operator
5108 * @lsmrule: audit rule
5110 * Determine if given @secid matches a rule previously approved by
5111 * security_audit_rule_known().
5113 * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
5116 int security_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *lsmrule
)
5118 return call_int_hook(audit_rule_match
, 0, secid
, field
, op
, lsmrule
);
5120 #endif /* CONFIG_AUDIT */
5122 #ifdef CONFIG_BPF_SYSCALL
5124 * security_bpf() - Check if the bpf syscall operation is allowed
5126 * @attr: bpf attribute
5129 * Do a initial check for all bpf syscalls after the attribute is copied into
5130 * the kernel. The actual security module can implement their own rules to
5131 * check the specific cmd they need.
5133 * Return: Returns 0 if permission is granted.
5135 int security_bpf(int cmd
, union bpf_attr
*attr
, unsigned int size
)
5137 return call_int_hook(bpf
, 0, cmd
, attr
, size
);
5141 * security_bpf_map() - Check if access to a bpf map is allowed
5145 * Do a check when the kernel generates and returns a file descriptor for eBPF
5148 * Return: Returns 0 if permission is granted.
5150 int security_bpf_map(struct bpf_map
*map
, fmode_t fmode
)
5152 return call_int_hook(bpf_map
, 0, map
, fmode
);
5156 * security_bpf_prog() - Check if access to a bpf program is allowed
5157 * @prog: bpf program
5159 * Do a check when the kernel generates and returns a file descriptor for eBPF
5162 * Return: Returns 0 if permission is granted.
5164 int security_bpf_prog(struct bpf_prog
*prog
)
5166 return call_int_hook(bpf_prog
, 0, prog
);
5170 * security_bpf_map_alloc() - Allocate a bpf map LSM blob
5173 * Initialize the security field inside bpf map.
5175 * Return: Returns 0 on success, error on failure.
5177 int security_bpf_map_alloc(struct bpf_map
*map
)
5179 return call_int_hook(bpf_map_alloc_security
, 0, map
);
5183 * security_bpf_prog_alloc() - Allocate a bpf program LSM blob
5184 * @aux: bpf program aux info struct
5186 * Initialize the security field inside bpf program.
5188 * Return: Returns 0 on success, error on failure.
5190 int security_bpf_prog_alloc(struct bpf_prog_aux
*aux
)
5192 return call_int_hook(bpf_prog_alloc_security
, 0, aux
);
5196 * security_bpf_map_free() - Free a bpf map's LSM blob
5199 * Clean up the security information stored inside bpf map.
5201 void security_bpf_map_free(struct bpf_map
*map
)
5203 call_void_hook(bpf_map_free_security
, map
);
5207 * security_bpf_prog_free() - Free a bpf program's LSM blob
5208 * @aux: bpf program aux info struct
5210 * Clean up the security information stored inside bpf prog.
5212 void security_bpf_prog_free(struct bpf_prog_aux
*aux
)
5214 call_void_hook(bpf_prog_free_security
, aux
);
5216 #endif /* CONFIG_BPF_SYSCALL */
5219 * security_locked_down() - Check if a kernel feature is allowed
5220 * @what: requested kernel feature
5222 * Determine whether a kernel feature that potentially enables arbitrary code
5223 * execution in kernel space should be permitted.
5225 * Return: Returns 0 if permission is granted.
5227 int security_locked_down(enum lockdown_reason what
)
5229 return call_int_hook(locked_down
, 0, what
);
5231 EXPORT_SYMBOL(security_locked_down
);
5233 #ifdef CONFIG_PERF_EVENTS
5235 * security_perf_event_open() - Check if a perf event open is allowed
5236 * @attr: perf event attribute
5237 * @type: type of event
5239 * Check whether the @type of perf_event_open syscall is allowed.
5241 * Return: Returns 0 if permission is granted.
5243 int security_perf_event_open(struct perf_event_attr
*attr
, int type
)
5245 return call_int_hook(perf_event_open
, 0, attr
, type
);
5249 * security_perf_event_alloc() - Allocate a perf event LSM blob
5250 * @event: perf event
5252 * Allocate and save perf_event security info.
5254 * Return: Returns 0 on success, error on failure.
5256 int security_perf_event_alloc(struct perf_event
*event
)
5258 return call_int_hook(perf_event_alloc
, 0, event
);
5262 * security_perf_event_free() - Free a perf event LSM blob
5263 * @event: perf event
5265 * Release (free) perf_event security info.
5267 void security_perf_event_free(struct perf_event
*event
)
5269 call_void_hook(perf_event_free
, event
);
5273 * security_perf_event_read() - Check if reading a perf event label is allowed
5274 * @event: perf event
5276 * Read perf_event security info if allowed.
5278 * Return: Returns 0 if permission is granted.
5280 int security_perf_event_read(struct perf_event
*event
)
5282 return call_int_hook(perf_event_read
, 0, event
);
5286 * security_perf_event_write() - Check if writing a perf event label is allowed
5287 * @event: perf event
5289 * Write perf_event security info if allowed.
5291 * Return: Returns 0 if permission is granted.
5293 int security_perf_event_write(struct perf_event
*event
)
5295 return call_int_hook(perf_event_write
, 0, event
);
5297 #endif /* CONFIG_PERF_EVENTS */
5299 #ifdef CONFIG_IO_URING
5301 * security_uring_override_creds() - Check if overriding creds is allowed
5302 * @new: new credentials
5304 * Check if the current task, executing an io_uring operation, is allowed to
5305 * override it's credentials with @new.
5307 * Return: Returns 0 if permission is granted.
5309 int security_uring_override_creds(const struct cred
*new)
5311 return call_int_hook(uring_override_creds
, 0, new);
5315 * security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
5317 * Check whether the current task is allowed to spawn a io_uring polling thread
5318 * (IORING_SETUP_SQPOLL).
5320 * Return: Returns 0 if permission is granted.
5322 int security_uring_sqpoll(void)
5324 return call_int_hook(uring_sqpoll
, 0);
5328 * security_uring_cmd() - Check if a io_uring passthrough command is allowed
5331 * Check whether the file_operations uring_cmd is allowed to run.
5333 * Return: Returns 0 if permission is granted.
5335 int security_uring_cmd(struct io_uring_cmd
*ioucmd
)
5337 return call_int_hook(uring_cmd
, 0, ioucmd
);
5339 #endif /* CONFIG_IO_URING */