1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Security plug functions
5 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
6 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
8 * Copyright (C) 2016 Mellanox Technologies
9 * Copyright (C) 2023 Microsoft Corporation <paul@paul-moore.com>
12 #define pr_fmt(fmt) "LSM: " fmt
14 #include <linux/bpf.h>
15 #include <linux/capability.h>
16 #include <linux/dcache.h>
17 #include <linux/export.h>
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/kernel_read_file.h>
21 #include <linux/lsm_hooks.h>
22 #include <linux/fsnotify.h>
23 #include <linux/mman.h>
24 #include <linux/mount.h>
25 #include <linux/personality.h>
26 #include <linux/backing-dev.h>
27 #include <linux/string.h>
28 #include <linux/xattr.h>
29 #include <linux/msg.h>
30 #include <linux/overflow.h>
33 /* How many LSMs were built into the kernel? */
34 #define LSM_COUNT (__end_lsm_info - __start_lsm_info)
37 * How many LSMs are built into the kernel as determined at
38 * build time. Used to determine fixed array sizes.
39 * The capability module is accounted for by CONFIG_SECURITY
41 #define LSM_CONFIG_COUNT ( \
42 (IS_ENABLED(CONFIG_SECURITY) ? 1 : 0) + \
43 (IS_ENABLED(CONFIG_SECURITY_SELINUX) ? 1 : 0) + \
44 (IS_ENABLED(CONFIG_SECURITY_SMACK) ? 1 : 0) + \
45 (IS_ENABLED(CONFIG_SECURITY_TOMOYO) ? 1 : 0) + \
46 (IS_ENABLED(CONFIG_SECURITY_APPARMOR) ? 1 : 0) + \
47 (IS_ENABLED(CONFIG_SECURITY_YAMA) ? 1 : 0) + \
48 (IS_ENABLED(CONFIG_SECURITY_LOADPIN) ? 1 : 0) + \
49 (IS_ENABLED(CONFIG_SECURITY_SAFESETID) ? 1 : 0) + \
50 (IS_ENABLED(CONFIG_SECURITY_LOCKDOWN_LSM) ? 1 : 0) + \
51 (IS_ENABLED(CONFIG_BPF_LSM) ? 1 : 0) + \
52 (IS_ENABLED(CONFIG_SECURITY_LANDLOCK) ? 1 : 0) + \
53 (IS_ENABLED(CONFIG_IMA) ? 1 : 0) + \
54 (IS_ENABLED(CONFIG_EVM) ? 1 : 0))
57 * These are descriptions of the reasons that can be passed to the
58 * security_locked_down() LSM hook. Placing this array here allows
59 * all security modules to use the same descriptions for auditing
62 const char *const lockdown_reasons
[LOCKDOWN_CONFIDENTIALITY_MAX
+ 1] = {
63 [LOCKDOWN_NONE
] = "none",
64 [LOCKDOWN_MODULE_SIGNATURE
] = "unsigned module loading",
65 [LOCKDOWN_DEV_MEM
] = "/dev/mem,kmem,port",
66 [LOCKDOWN_EFI_TEST
] = "/dev/efi_test access",
67 [LOCKDOWN_KEXEC
] = "kexec of unsigned images",
68 [LOCKDOWN_HIBERNATION
] = "hibernation",
69 [LOCKDOWN_PCI_ACCESS
] = "direct PCI access",
70 [LOCKDOWN_IOPORT
] = "raw io port access",
71 [LOCKDOWN_MSR
] = "raw MSR access",
72 [LOCKDOWN_ACPI_TABLES
] = "modifying ACPI tables",
73 [LOCKDOWN_DEVICE_TREE
] = "modifying device tree contents",
74 [LOCKDOWN_PCMCIA_CIS
] = "direct PCMCIA CIS storage",
75 [LOCKDOWN_TIOCSSERIAL
] = "reconfiguration of serial port IO",
76 [LOCKDOWN_MODULE_PARAMETERS
] = "unsafe module parameters",
77 [LOCKDOWN_MMIOTRACE
] = "unsafe mmio",
78 [LOCKDOWN_DEBUGFS
] = "debugfs access",
79 [LOCKDOWN_XMON_WR
] = "xmon write access",
80 [LOCKDOWN_BPF_WRITE_USER
] = "use of bpf to write user RAM",
81 [LOCKDOWN_DBG_WRITE_KERNEL
] = "use of kgdb/kdb to write kernel RAM",
82 [LOCKDOWN_RTAS_ERROR_INJECTION
] = "RTAS error injection",
83 [LOCKDOWN_INTEGRITY_MAX
] = "integrity",
84 [LOCKDOWN_KCORE
] = "/proc/kcore access",
85 [LOCKDOWN_KPROBES
] = "use of kprobes",
86 [LOCKDOWN_BPF_READ_KERNEL
] = "use of bpf to read kernel RAM",
87 [LOCKDOWN_DBG_READ_KERNEL
] = "use of kgdb/kdb to read kernel RAM",
88 [LOCKDOWN_PERF
] = "unsafe use of perf",
89 [LOCKDOWN_TRACEFS
] = "use of tracefs",
90 [LOCKDOWN_XMON_RW
] = "xmon read and write access",
91 [LOCKDOWN_XFRM_SECRET
] = "xfrm SA secret",
92 [LOCKDOWN_CONFIDENTIALITY_MAX
] = "confidentiality",
95 struct security_hook_heads security_hook_heads __ro_after_init
;
96 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain
);
98 static struct kmem_cache
*lsm_file_cache
;
99 static struct kmem_cache
*lsm_inode_cache
;
102 static struct lsm_blob_sizes blob_sizes __ro_after_init
;
104 /* Boot-time LSM user choice */
105 static __initdata
const char *chosen_lsm_order
;
106 static __initdata
const char *chosen_major_lsm
;
108 static __initconst
const char *const builtin_lsm_order
= CONFIG_LSM
;
110 /* Ordered list of LSMs to initialize. */
111 static __initdata
struct lsm_info
**ordered_lsms
;
112 static __initdata
struct lsm_info
*exclusive
;
114 static __initdata
bool debug
;
115 #define init_debug(...) \
118 pr_info(__VA_ARGS__); \
121 static bool __init
is_enabled(struct lsm_info
*lsm
)
126 return *lsm
->enabled
;
129 /* Mark an LSM's enabled flag. */
130 static int lsm_enabled_true __initdata
= 1;
131 static int lsm_enabled_false __initdata
= 0;
132 static void __init
set_enabled(struct lsm_info
*lsm
, bool enabled
)
135 * When an LSM hasn't configured an enable variable, we can use
136 * a hard-coded location for storing the default enabled state.
140 lsm
->enabled
= &lsm_enabled_true
;
142 lsm
->enabled
= &lsm_enabled_false
;
143 } else if (lsm
->enabled
== &lsm_enabled_true
) {
145 lsm
->enabled
= &lsm_enabled_false
;
146 } else if (lsm
->enabled
== &lsm_enabled_false
) {
148 lsm
->enabled
= &lsm_enabled_true
;
150 *lsm
->enabled
= enabled
;
154 /* Is an LSM already listed in the ordered LSMs list? */
155 static bool __init
exists_ordered_lsm(struct lsm_info
*lsm
)
157 struct lsm_info
**check
;
159 for (check
= ordered_lsms
; *check
; check
++)
166 /* Append an LSM to the list of ordered LSMs to initialize. */
167 static int last_lsm __initdata
;
168 static void __init
append_ordered_lsm(struct lsm_info
*lsm
, const char *from
)
170 /* Ignore duplicate selections. */
171 if (exists_ordered_lsm(lsm
))
174 if (WARN(last_lsm
== LSM_COUNT
, "%s: out of LSM slots!?\n", from
))
177 /* Enable this LSM, if it is not already set. */
179 lsm
->enabled
= &lsm_enabled_true
;
180 ordered_lsms
[last_lsm
++] = lsm
;
182 init_debug("%s ordered: %s (%s)\n", from
, lsm
->name
,
183 is_enabled(lsm
) ? "enabled" : "disabled");
186 /* Is an LSM allowed to be initialized? */
187 static bool __init
lsm_allowed(struct lsm_info
*lsm
)
189 /* Skip if the LSM is disabled. */
190 if (!is_enabled(lsm
))
193 /* Not allowed if another exclusive LSM already initialized. */
194 if ((lsm
->flags
& LSM_FLAG_EXCLUSIVE
) && exclusive
) {
195 init_debug("exclusive disabled: %s\n", lsm
->name
);
202 static void __init
lsm_set_blob_size(int *need
, int *lbs
)
209 offset
= ALIGN(*lbs
, sizeof(void *));
210 *lbs
= offset
+ *need
;
214 static void __init
lsm_set_blob_sizes(struct lsm_blob_sizes
*needed
)
219 lsm_set_blob_size(&needed
->lbs_cred
, &blob_sizes
.lbs_cred
);
220 lsm_set_blob_size(&needed
->lbs_file
, &blob_sizes
.lbs_file
);
222 * The inode blob gets an rcu_head in addition to
223 * what the modules might need.
225 if (needed
->lbs_inode
&& blob_sizes
.lbs_inode
== 0)
226 blob_sizes
.lbs_inode
= sizeof(struct rcu_head
);
227 lsm_set_blob_size(&needed
->lbs_inode
, &blob_sizes
.lbs_inode
);
228 lsm_set_blob_size(&needed
->lbs_ipc
, &blob_sizes
.lbs_ipc
);
229 lsm_set_blob_size(&needed
->lbs_msg_msg
, &blob_sizes
.lbs_msg_msg
);
230 lsm_set_blob_size(&needed
->lbs_superblock
, &blob_sizes
.lbs_superblock
);
231 lsm_set_blob_size(&needed
->lbs_task
, &blob_sizes
.lbs_task
);
232 lsm_set_blob_size(&needed
->lbs_xattr_count
,
233 &blob_sizes
.lbs_xattr_count
);
236 /* Prepare LSM for initialization. */
237 static void __init
prepare_lsm(struct lsm_info
*lsm
)
239 int enabled
= lsm_allowed(lsm
);
241 /* Record enablement (to handle any following exclusive LSMs). */
242 set_enabled(lsm
, enabled
);
244 /* If enabled, do pre-initialization work. */
246 if ((lsm
->flags
& LSM_FLAG_EXCLUSIVE
) && !exclusive
) {
248 init_debug("exclusive chosen: %s\n", lsm
->name
);
251 lsm_set_blob_sizes(lsm
->blobs
);
255 /* Initialize a given LSM, if it is enabled. */
256 static void __init
initialize_lsm(struct lsm_info
*lsm
)
258 if (is_enabled(lsm
)) {
261 init_debug("initializing %s\n", lsm
->name
);
263 WARN(ret
, "%s failed to initialize: %d\n", lsm
->name
, ret
);
268 * Current index to use while initializing the lsm id list.
270 u32 lsm_active_cnt __ro_after_init
;
271 const struct lsm_id
*lsm_idlist
[LSM_CONFIG_COUNT
];
273 /* Populate ordered LSMs list from comma-separated LSM name list. */
274 static void __init
ordered_lsm_parse(const char *order
, const char *origin
)
276 struct lsm_info
*lsm
;
277 char *sep
, *name
, *next
;
279 /* LSM_ORDER_FIRST is always first. */
280 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
281 if (lsm
->order
== LSM_ORDER_FIRST
)
282 append_ordered_lsm(lsm
, " first");
285 /* Process "security=", if given. */
286 if (chosen_major_lsm
) {
287 struct lsm_info
*major
;
290 * To match the original "security=" behavior, this
291 * explicitly does NOT fallback to another Legacy Major
292 * if the selected one was separately disabled: disable
293 * all non-matching Legacy Major LSMs.
295 for (major
= __start_lsm_info
; major
< __end_lsm_info
;
297 if ((major
->flags
& LSM_FLAG_LEGACY_MAJOR
) &&
298 strcmp(major
->name
, chosen_major_lsm
) != 0) {
299 set_enabled(major
, false);
300 init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
301 chosen_major_lsm
, major
->name
);
306 sep
= kstrdup(order
, GFP_KERNEL
);
308 /* Walk the list, looking for matching LSMs. */
309 while ((name
= strsep(&next
, ",")) != NULL
) {
312 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
313 if (strcmp(lsm
->name
, name
) == 0) {
314 if (lsm
->order
== LSM_ORDER_MUTABLE
)
315 append_ordered_lsm(lsm
, origin
);
321 init_debug("%s ignored: %s (not built into kernel)\n",
325 /* Process "security=", if given. */
326 if (chosen_major_lsm
) {
327 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
328 if (exists_ordered_lsm(lsm
))
330 if (strcmp(lsm
->name
, chosen_major_lsm
) == 0)
331 append_ordered_lsm(lsm
, "security=");
335 /* LSM_ORDER_LAST is always last. */
336 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
337 if (lsm
->order
== LSM_ORDER_LAST
)
338 append_ordered_lsm(lsm
, " last");
341 /* Disable all LSMs not in the ordered list. */
342 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
343 if (exists_ordered_lsm(lsm
))
345 set_enabled(lsm
, false);
346 init_debug("%s skipped: %s (not in requested order)\n",
353 static void __init
lsm_early_cred(struct cred
*cred
);
354 static void __init
lsm_early_task(struct task_struct
*task
);
356 static int lsm_append(const char *new, char **result
);
358 static void __init
report_lsm_order(void)
360 struct lsm_info
**lsm
, *early
;
363 pr_info("initializing lsm=");
365 /* Report each enabled LSM name, comma separated. */
366 for (early
= __start_early_lsm_info
;
367 early
< __end_early_lsm_info
; early
++)
368 if (is_enabled(early
))
369 pr_cont("%s%s", first
++ == 0 ? "" : ",", early
->name
);
370 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
371 if (is_enabled(*lsm
))
372 pr_cont("%s%s", first
++ == 0 ? "" : ",", (*lsm
)->name
);
377 static void __init
ordered_lsm_init(void)
379 struct lsm_info
**lsm
;
381 ordered_lsms
= kcalloc(LSM_COUNT
+ 1, sizeof(*ordered_lsms
),
384 if (chosen_lsm_order
) {
385 if (chosen_major_lsm
) {
386 pr_warn("security=%s is ignored because it is superseded by lsm=%s\n",
387 chosen_major_lsm
, chosen_lsm_order
);
388 chosen_major_lsm
= NULL
;
390 ordered_lsm_parse(chosen_lsm_order
, "cmdline");
392 ordered_lsm_parse(builtin_lsm_order
, "builtin");
394 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
399 init_debug("cred blob size = %d\n", blob_sizes
.lbs_cred
);
400 init_debug("file blob size = %d\n", blob_sizes
.lbs_file
);
401 init_debug("inode blob size = %d\n", blob_sizes
.lbs_inode
);
402 init_debug("ipc blob size = %d\n", blob_sizes
.lbs_ipc
);
403 init_debug("msg_msg blob size = %d\n", blob_sizes
.lbs_msg_msg
);
404 init_debug("superblock blob size = %d\n", blob_sizes
.lbs_superblock
);
405 init_debug("task blob size = %d\n", blob_sizes
.lbs_task
);
406 init_debug("xattr slots = %d\n", blob_sizes
.lbs_xattr_count
);
409 * Create any kmem_caches needed for blobs
411 if (blob_sizes
.lbs_file
)
412 lsm_file_cache
= kmem_cache_create("lsm_file_cache",
413 blob_sizes
.lbs_file
, 0,
415 if (blob_sizes
.lbs_inode
)
416 lsm_inode_cache
= kmem_cache_create("lsm_inode_cache",
417 blob_sizes
.lbs_inode
, 0,
420 lsm_early_cred((struct cred
*) current
->cred
);
421 lsm_early_task(current
);
422 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
423 initialize_lsm(*lsm
);
428 int __init
early_security_init(void)
430 struct lsm_info
*lsm
;
432 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
433 INIT_HLIST_HEAD(&security_hook_heads.NAME);
434 #include "linux/lsm_hook_defs.h"
437 for (lsm
= __start_early_lsm_info
; lsm
< __end_early_lsm_info
; lsm
++) {
439 lsm
->enabled
= &lsm_enabled_true
;
448 * security_init - initializes the security framework
450 * This should be called early in the kernel initialization sequence.
452 int __init
security_init(void)
454 struct lsm_info
*lsm
;
456 init_debug("legacy security=%s\n", chosen_major_lsm
? : " *unspecified*");
457 init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order
);
458 init_debug("boot arg lsm=%s\n", chosen_lsm_order
? : " *unspecified*");
461 * Append the names of the early LSM modules now that kmalloc() is
464 for (lsm
= __start_early_lsm_info
; lsm
< __end_early_lsm_info
; lsm
++) {
465 init_debug(" early started: %s (%s)\n", lsm
->name
,
466 is_enabled(lsm
) ? "enabled" : "disabled");
468 lsm_append(lsm
->name
, &lsm_names
);
471 /* Load LSMs in specified order. */
477 /* Save user chosen LSM */
478 static int __init
choose_major_lsm(char *str
)
480 chosen_major_lsm
= str
;
483 __setup("security=", choose_major_lsm
);
485 /* Explicitly choose LSM initialization order. */
486 static int __init
choose_lsm_order(char *str
)
488 chosen_lsm_order
= str
;
491 __setup("lsm=", choose_lsm_order
);
493 /* Enable LSM order debugging. */
494 static int __init
enable_debug(char *str
)
499 __setup("lsm.debug", enable_debug
);
501 static bool match_last_lsm(const char *list
, const char *lsm
)
505 if (WARN_ON(!list
|| !lsm
))
507 last
= strrchr(list
, ',');
509 /* Pass the comma, strcmp() will check for '\0' */
513 return !strcmp(last
, lsm
);
516 static int lsm_append(const char *new, char **result
)
520 if (*result
== NULL
) {
521 *result
= kstrdup(new, GFP_KERNEL
);
525 /* Check if it is the last registered name */
526 if (match_last_lsm(*result
, new))
528 cp
= kasprintf(GFP_KERNEL
, "%s,%s", *result
, new);
538 * security_add_hooks - Add a modules hooks to the hook lists.
539 * @hooks: the hooks to add
540 * @count: the number of hooks to add
541 * @lsmid: the identification information for the security module
543 * Each LSM has to register its hooks with the infrastructure.
545 void __init
security_add_hooks(struct security_hook_list
*hooks
, int count
,
546 const struct lsm_id
*lsmid
)
551 * A security module may call security_add_hooks() more
552 * than once during initialization, and LSM initialization
553 * is serialized. Landlock is one such case.
554 * Look at the previous entry, if there is one, for duplication.
556 if (lsm_active_cnt
== 0 || lsm_idlist
[lsm_active_cnt
- 1] != lsmid
) {
557 if (lsm_active_cnt
>= LSM_CONFIG_COUNT
)
558 panic("%s Too many LSMs registered.\n", __func__
);
559 lsm_idlist
[lsm_active_cnt
++] = lsmid
;
562 for (i
= 0; i
< count
; i
++) {
563 hooks
[i
].lsmid
= lsmid
;
564 hlist_add_tail_rcu(&hooks
[i
].list
, hooks
[i
].head
);
568 * Don't try to append during early_security_init(), we'll come back
569 * and fix this up afterwards.
571 if (slab_is_available()) {
572 if (lsm_append(lsmid
->name
, &lsm_names
) < 0)
573 panic("%s - Cannot get early memory.\n", __func__
);
577 int call_blocking_lsm_notifier(enum lsm_event event
, void *data
)
579 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain
,
582 EXPORT_SYMBOL(call_blocking_lsm_notifier
);
584 int register_blocking_lsm_notifier(struct notifier_block
*nb
)
586 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain
,
589 EXPORT_SYMBOL(register_blocking_lsm_notifier
);
591 int unregister_blocking_lsm_notifier(struct notifier_block
*nb
)
593 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain
,
596 EXPORT_SYMBOL(unregister_blocking_lsm_notifier
);
599 * lsm_cred_alloc - allocate a composite cred blob
600 * @cred: the cred that needs a blob
601 * @gfp: allocation type
603 * Allocate the cred blob for all the modules
605 * Returns 0, or -ENOMEM if memory can't be allocated.
607 static int lsm_cred_alloc(struct cred
*cred
, gfp_t gfp
)
609 if (blob_sizes
.lbs_cred
== 0) {
610 cred
->security
= NULL
;
614 cred
->security
= kzalloc(blob_sizes
.lbs_cred
, gfp
);
615 if (cred
->security
== NULL
)
621 * lsm_early_cred - during initialization allocate a composite cred blob
622 * @cred: the cred that needs a blob
624 * Allocate the cred blob for all the modules
626 static void __init
lsm_early_cred(struct cred
*cred
)
628 int rc
= lsm_cred_alloc(cred
, GFP_KERNEL
);
631 panic("%s: Early cred alloc failed.\n", __func__
);
635 * lsm_file_alloc - allocate a composite file blob
636 * @file: the file that needs a blob
638 * Allocate the file blob for all the modules
640 * Returns 0, or -ENOMEM if memory can't be allocated.
642 static int lsm_file_alloc(struct file
*file
)
644 if (!lsm_file_cache
) {
645 file
->f_security
= NULL
;
649 file
->f_security
= kmem_cache_zalloc(lsm_file_cache
, GFP_KERNEL
);
650 if (file
->f_security
== NULL
)
656 * lsm_inode_alloc - allocate a composite inode blob
657 * @inode: the inode that needs a blob
659 * Allocate the inode blob for all the modules
661 * Returns 0, or -ENOMEM if memory can't be allocated.
663 int lsm_inode_alloc(struct inode
*inode
)
665 if (!lsm_inode_cache
) {
666 inode
->i_security
= NULL
;
670 inode
->i_security
= kmem_cache_zalloc(lsm_inode_cache
, GFP_NOFS
);
671 if (inode
->i_security
== NULL
)
677 * lsm_task_alloc - allocate a composite task blob
678 * @task: the task that needs a blob
680 * Allocate the task blob for all the modules
682 * Returns 0, or -ENOMEM if memory can't be allocated.
684 static int lsm_task_alloc(struct task_struct
*task
)
686 if (blob_sizes
.lbs_task
== 0) {
687 task
->security
= NULL
;
691 task
->security
= kzalloc(blob_sizes
.lbs_task
, GFP_KERNEL
);
692 if (task
->security
== NULL
)
698 * lsm_ipc_alloc - allocate a composite ipc blob
699 * @kip: the ipc that needs a blob
701 * Allocate the ipc blob for all the modules
703 * Returns 0, or -ENOMEM if memory can't be allocated.
705 static int lsm_ipc_alloc(struct kern_ipc_perm
*kip
)
707 if (blob_sizes
.lbs_ipc
== 0) {
708 kip
->security
= NULL
;
712 kip
->security
= kzalloc(blob_sizes
.lbs_ipc
, GFP_KERNEL
);
713 if (kip
->security
== NULL
)
719 * lsm_msg_msg_alloc - allocate a composite msg_msg blob
720 * @mp: the msg_msg that needs a blob
722 * Allocate the ipc blob for all the modules
724 * Returns 0, or -ENOMEM if memory can't be allocated.
726 static int lsm_msg_msg_alloc(struct msg_msg
*mp
)
728 if (blob_sizes
.lbs_msg_msg
== 0) {
733 mp
->security
= kzalloc(blob_sizes
.lbs_msg_msg
, GFP_KERNEL
);
734 if (mp
->security
== NULL
)
740 * lsm_early_task - during initialization allocate a composite task blob
741 * @task: the task that needs a blob
743 * Allocate the task blob for all the modules
745 static void __init
lsm_early_task(struct task_struct
*task
)
747 int rc
= lsm_task_alloc(task
);
750 panic("%s: Early task alloc failed.\n", __func__
);
754 * lsm_superblock_alloc - allocate a composite superblock blob
755 * @sb: the superblock that needs a blob
757 * Allocate the superblock blob for all the modules
759 * Returns 0, or -ENOMEM if memory can't be allocated.
761 static int lsm_superblock_alloc(struct super_block
*sb
)
763 if (blob_sizes
.lbs_superblock
== 0) {
764 sb
->s_security
= NULL
;
768 sb
->s_security
= kzalloc(blob_sizes
.lbs_superblock
, GFP_KERNEL
);
769 if (sb
->s_security
== NULL
)
775 * lsm_fill_user_ctx - Fill a user space lsm_ctx structure
776 * @uctx: a userspace LSM context to be filled
777 * @uctx_len: available uctx size (input), used uctx size (output)
778 * @val: the new LSM context value
779 * @val_len: the size of the new LSM context value
781 * @flags: LSM defined flags
783 * Fill all of the fields in a userspace lsm_ctx structure. If @uctx is NULL
784 * simply calculate the required size to output via @utc_len and return
787 * Returns 0 on success, -E2BIG if userspace buffer is not large enough,
788 * -EFAULT on a copyout error, -ENOMEM if memory can't be allocated.
790 int lsm_fill_user_ctx(struct lsm_ctx __user
*uctx
, u32
*uctx_len
,
791 void *val
, size_t val_len
,
794 struct lsm_ctx
*nctx
= NULL
;
798 nctx_len
= ALIGN(struct_size(nctx
, ctx
, val_len
), sizeof(void *));
799 if (nctx_len
> *uctx_len
) {
804 /* no buffer - return success/0 and set @uctx_len to the req size */
808 nctx
= kzalloc(nctx_len
, GFP_KERNEL
);
815 nctx
->len
= nctx_len
;
816 nctx
->ctx_len
= val_len
;
817 memcpy(nctx
->ctx
, val
, val_len
);
819 if (copy_to_user(uctx
, nctx
, nctx_len
))
824 *uctx_len
= nctx_len
;
829 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
830 * can be accessed with:
832 * LSM_RET_DEFAULT(<hook_name>)
834 * The macros below define static constants for the default value of each
837 #define LSM_RET_DEFAULT(NAME) (NAME##_default)
838 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
839 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
840 static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
841 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
842 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
844 #include <linux/lsm_hook_defs.h>
848 * Hook list operation macros.
851 * This is a hook that does not return a value.
854 * This is a hook that returns a value.
857 #define call_void_hook(FUNC, ...) \
859 struct security_hook_list *P; \
861 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
862 P->hook.FUNC(__VA_ARGS__); \
865 #define call_int_hook(FUNC, ...) ({ \
866 int RC = LSM_RET_DEFAULT(FUNC); \
868 struct security_hook_list *P; \
870 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
871 RC = P->hook.FUNC(__VA_ARGS__); \
872 if (RC != LSM_RET_DEFAULT(FUNC)) \
879 /* Security operations */
882 * security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
883 * @mgr: task credentials of current binder process
885 * Check whether @mgr is allowed to be the binder context manager.
887 * Return: Return 0 if permission is granted.
889 int security_binder_set_context_mgr(const struct cred
*mgr
)
891 return call_int_hook(binder_set_context_mgr
, mgr
);
895 * security_binder_transaction() - Check if a binder transaction is allowed
896 * @from: sending process
897 * @to: receiving process
899 * Check whether @from is allowed to invoke a binder transaction call to @to.
901 * Return: Returns 0 if permission is granted.
903 int security_binder_transaction(const struct cred
*from
,
904 const struct cred
*to
)
906 return call_int_hook(binder_transaction
, from
, to
);
910 * security_binder_transfer_binder() - Check if a binder transfer is allowed
911 * @from: sending process
912 * @to: receiving process
914 * Check whether @from is allowed to transfer a binder reference to @to.
916 * Return: Returns 0 if permission is granted.
918 int security_binder_transfer_binder(const struct cred
*from
,
919 const struct cred
*to
)
921 return call_int_hook(binder_transfer_binder
, from
, to
);
925 * security_binder_transfer_file() - Check if a binder file xfer is allowed
926 * @from: sending process
927 * @to: receiving process
928 * @file: file being transferred
930 * Check whether @from is allowed to transfer @file to @to.
932 * Return: Returns 0 if permission is granted.
934 int security_binder_transfer_file(const struct cred
*from
,
935 const struct cred
*to
, const struct file
*file
)
937 return call_int_hook(binder_transfer_file
, from
, to
, file
);
941 * security_ptrace_access_check() - Check if tracing is allowed
942 * @child: target process
943 * @mode: PTRACE_MODE flags
945 * Check permission before allowing the current process to trace the @child
946 * process. Security modules may also want to perform a process tracing check
947 * during an execve in the set_security or apply_creds hooks of tracing check
948 * during an execve in the bprm_set_creds hook of binprm_security_ops if the
949 * process is being traced and its security attributes would be changed by the
952 * Return: Returns 0 if permission is granted.
954 int security_ptrace_access_check(struct task_struct
*child
, unsigned int mode
)
956 return call_int_hook(ptrace_access_check
, child
, mode
);
960 * security_ptrace_traceme() - Check if tracing is allowed
961 * @parent: tracing process
963 * Check that the @parent process has sufficient permission to trace the
964 * current process before allowing the current process to present itself to the
965 * @parent process for tracing.
967 * Return: Returns 0 if permission is granted.
969 int security_ptrace_traceme(struct task_struct
*parent
)
971 return call_int_hook(ptrace_traceme
, parent
);
975 * security_capget() - Get the capability sets for a process
976 * @target: target process
977 * @effective: effective capability set
978 * @inheritable: inheritable capability set
979 * @permitted: permitted capability set
981 * Get the @effective, @inheritable, and @permitted capability sets for the
982 * @target process. The hook may also perform permission checking to determine
983 * if the current process is allowed to see the capability sets of the @target
986 * Return: Returns 0 if the capability sets were successfully obtained.
988 int security_capget(const struct task_struct
*target
,
989 kernel_cap_t
*effective
,
990 kernel_cap_t
*inheritable
,
991 kernel_cap_t
*permitted
)
993 return call_int_hook(capget
, target
, effective
, inheritable
, permitted
);
997 * security_capset() - Set the capability sets for a process
998 * @new: new credentials for the target process
999 * @old: current credentials of the target process
1000 * @effective: effective capability set
1001 * @inheritable: inheritable capability set
1002 * @permitted: permitted capability set
1004 * Set the @effective, @inheritable, and @permitted capability sets for the
1007 * Return: Returns 0 and update @new if permission is granted.
1009 int security_capset(struct cred
*new, const struct cred
*old
,
1010 const kernel_cap_t
*effective
,
1011 const kernel_cap_t
*inheritable
,
1012 const kernel_cap_t
*permitted
)
1014 return call_int_hook(capset
, new, old
, effective
, inheritable
,
1019 * security_capable() - Check if a process has the necessary capability
1020 * @cred: credentials to examine
1021 * @ns: user namespace
1022 * @cap: capability requested
1023 * @opts: capability check options
1025 * Check whether the @tsk process has the @cap capability in the indicated
1026 * credentials. @cap contains the capability <include/linux/capability.h>.
1027 * @opts contains options for the capable check <include/linux/security.h>.
1029 * Return: Returns 0 if the capability is granted.
1031 int security_capable(const struct cred
*cred
,
1032 struct user_namespace
*ns
,
1036 return call_int_hook(capable
, cred
, ns
, cap
, opts
);
1040 * security_quotactl() - Check if a quotactl() syscall is allowed for this fs
1046 * Check whether the quotactl syscall is allowed for this @sb.
1048 * Return: Returns 0 if permission is granted.
1050 int security_quotactl(int cmds
, int type
, int id
, const struct super_block
*sb
)
1052 return call_int_hook(quotactl
, cmds
, type
, id
, sb
);
1056 * security_quota_on() - Check if QUOTAON is allowed for a dentry
1059 * Check whether QUOTAON is allowed for @dentry.
1061 * Return: Returns 0 if permission is granted.
1063 int security_quota_on(struct dentry
*dentry
)
1065 return call_int_hook(quota_on
, dentry
);
1069 * security_syslog() - Check if accessing the kernel message ring is allowed
1070 * @type: SYSLOG_ACTION_* type
1072 * Check permission before accessing the kernel message ring or changing
1073 * logging to the console. See the syslog(2) manual page for an explanation of
1076 * Return: Return 0 if permission is granted.
1078 int security_syslog(int type
)
1080 return call_int_hook(syslog
, type
);
1084 * security_settime64() - Check if changing the system time is allowed
1088 * Check permission to change the system time, struct timespec64 is defined in
1089 * <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
1091 * Return: Returns 0 if permission is granted.
1093 int security_settime64(const struct timespec64
*ts
, const struct timezone
*tz
)
1095 return call_int_hook(settime
, ts
, tz
);
1099 * security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
1101 * @pages: number of pages
1103 * Check permissions for allocating a new virtual mapping. If all LSMs return
1104 * a positive value, __vm_enough_memory() will be called with cap_sys_admin
1105 * set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
1106 * called with cap_sys_admin cleared.
1108 * Return: Returns 0 if permission is granted by the LSM infrastructure to the
1111 int security_vm_enough_memory_mm(struct mm_struct
*mm
, long pages
)
1113 struct security_hook_list
*hp
;
1114 int cap_sys_admin
= 1;
1118 * The module will respond with a positive value if
1119 * it thinks the __vm_enough_memory() call should be
1120 * made with the cap_sys_admin set. If all of the modules
1121 * agree that it should be set it will. If any module
1122 * thinks it should not be set it won't.
1124 hlist_for_each_entry(hp
, &security_hook_heads
.vm_enough_memory
, list
) {
1125 rc
= hp
->hook
.vm_enough_memory(mm
, pages
);
1131 return __vm_enough_memory(mm
, pages
, cap_sys_admin
);
1135 * security_bprm_creds_for_exec() - Prepare the credentials for exec()
1136 * @bprm: binary program information
1138 * If the setup in prepare_exec_creds did not setup @bprm->cred->security
1139 * properly for executing @bprm->file, update the LSM's portion of
1140 * @bprm->cred->security to be what commit_creds needs to install for the new
1141 * program. This hook may also optionally check permissions (e.g. for
1142 * transitions between security domains). The hook must set @bprm->secureexec
1143 * to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
1144 * contains the linux_binprm structure.
1146 * Return: Returns 0 if the hook is successful and permission is granted.
1148 int security_bprm_creds_for_exec(struct linux_binprm
*bprm
)
1150 return call_int_hook(bprm_creds_for_exec
, bprm
);
1154 * security_bprm_creds_from_file() - Update linux_binprm creds based on file
1155 * @bprm: binary program information
1156 * @file: associated file
1158 * If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
1159 * exec, update @bprm->cred to reflect that change. This is called after
1160 * finding the binary that will be executed without an interpreter. This
1161 * ensures that the credentials will not be derived from a script that the
1162 * binary will need to reopen, which when reopend may end up being a completely
1163 * different file. This hook may also optionally check permissions (e.g. for
1164 * transitions between security domains). The hook must set @bprm->secureexec
1165 * to 1 if AT_SECURE should be set to request libc enable secure mode. The
1166 * hook must add to @bprm->per_clear any personality flags that should be
1167 * cleared from current->personality. @bprm contains the linux_binprm
1170 * Return: Returns 0 if the hook is successful and permission is granted.
1172 int security_bprm_creds_from_file(struct linux_binprm
*bprm
, const struct file
*file
)
1174 return call_int_hook(bprm_creds_from_file
, bprm
, file
);
1178 * security_bprm_check() - Mediate binary handler search
1179 * @bprm: binary program information
1181 * This hook mediates the point when a search for a binary handler will begin.
1182 * It allows a check against the @bprm->cred->security value which was set in
1183 * the preceding creds_for_exec call. The argv list and envp list are reliably
1184 * available in @bprm. This hook may be called multiple times during a single
1185 * execve. @bprm contains the linux_binprm structure.
1187 * Return: Returns 0 if the hook is successful and permission is granted.
1189 int security_bprm_check(struct linux_binprm
*bprm
)
1191 return call_int_hook(bprm_check_security
, bprm
);
1195 * security_bprm_committing_creds() - Install creds for a process during exec()
1196 * @bprm: binary program information
1198 * Prepare to install the new security attributes of a process being
1199 * transformed by an execve operation, based on the old credentials pointed to
1200 * by @current->cred and the information set in @bprm->cred by the
1201 * bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
1202 * hook is a good place to perform state changes on the process such as closing
1203 * open file descriptors to which access will no longer be granted when the
1204 * attributes are changed. This is called immediately before commit_creds().
1206 void security_bprm_committing_creds(const struct linux_binprm
*bprm
)
1208 call_void_hook(bprm_committing_creds
, bprm
);
1212 * security_bprm_committed_creds() - Tidy up after cred install during exec()
1213 * @bprm: binary program information
1215 * Tidy up after the installation of the new security attributes of a process
1216 * being transformed by an execve operation. The new credentials have, by this
1217 * point, been set to @current->cred. @bprm points to the linux_binprm
1218 * structure. This hook is a good place to perform state changes on the
1219 * process such as clearing out non-inheritable signal state. This is called
1220 * immediately after commit_creds().
1222 void security_bprm_committed_creds(const struct linux_binprm
*bprm
)
1224 call_void_hook(bprm_committed_creds
, bprm
);
1228 * security_fs_context_submount() - Initialise fc->security
1229 * @fc: new filesystem context
1230 * @reference: dentry reference for submount/remount
1232 * Fill out the ->security field for a new fs_context.
1234 * Return: Returns 0 on success or negative error code on failure.
1236 int security_fs_context_submount(struct fs_context
*fc
, struct super_block
*reference
)
1238 return call_int_hook(fs_context_submount
, fc
, reference
);
1242 * security_fs_context_dup() - Duplicate a fs_context LSM blob
1243 * @fc: destination filesystem context
1244 * @src_fc: source filesystem context
1246 * Allocate and attach a security structure to sc->security. This pointer is
1247 * initialised to NULL by the caller. @fc indicates the new filesystem context.
1248 * @src_fc indicates the original filesystem context.
1250 * Return: Returns 0 on success or a negative error code on failure.
1252 int security_fs_context_dup(struct fs_context
*fc
, struct fs_context
*src_fc
)
1254 return call_int_hook(fs_context_dup
, fc
, src_fc
);
1258 * security_fs_context_parse_param() - Configure a filesystem context
1259 * @fc: filesystem context
1260 * @param: filesystem parameter
1262 * Userspace provided a parameter to configure a superblock. The LSM can
1263 * consume the parameter or return it to the caller for use elsewhere.
1265 * Return: If the parameter is used by the LSM it should return 0, if it is
1266 * returned to the caller -ENOPARAM is returned, otherwise a negative
1267 * error code is returned.
1269 int security_fs_context_parse_param(struct fs_context
*fc
,
1270 struct fs_parameter
*param
)
1272 struct security_hook_list
*hp
;
1276 hlist_for_each_entry(hp
, &security_hook_heads
.fs_context_parse_param
,
1278 trc
= hp
->hook
.fs_context_parse_param(fc
, param
);
1281 else if (trc
!= -ENOPARAM
)
1288 * security_sb_alloc() - Allocate a super_block LSM blob
1289 * @sb: filesystem superblock
1291 * Allocate and attach a security structure to the sb->s_security field. The
1292 * s_security field is initialized to NULL when the structure is allocated.
1293 * @sb contains the super_block structure to be modified.
1295 * Return: Returns 0 if operation was successful.
1297 int security_sb_alloc(struct super_block
*sb
)
1299 int rc
= lsm_superblock_alloc(sb
);
1303 rc
= call_int_hook(sb_alloc_security
, sb
);
1305 security_sb_free(sb
);
1310 * security_sb_delete() - Release super_block LSM associated objects
1311 * @sb: filesystem superblock
1313 * Release objects tied to a superblock (e.g. inodes). @sb contains the
1314 * super_block structure being released.
1316 void security_sb_delete(struct super_block
*sb
)
1318 call_void_hook(sb_delete
, sb
);
1322 * security_sb_free() - Free a super_block LSM blob
1323 * @sb: filesystem superblock
1325 * Deallocate and clear the sb->s_security field. @sb contains the super_block
1326 * structure to be modified.
1328 void security_sb_free(struct super_block
*sb
)
1330 call_void_hook(sb_free_security
, sb
);
1331 kfree(sb
->s_security
);
1332 sb
->s_security
= NULL
;
1336 * security_free_mnt_opts() - Free memory associated with mount options
1337 * @mnt_opts: LSM processed mount options
1339 * Free memory associated with @mnt_ops.
1341 void security_free_mnt_opts(void **mnt_opts
)
1345 call_void_hook(sb_free_mnt_opts
, *mnt_opts
);
1348 EXPORT_SYMBOL(security_free_mnt_opts
);
1351 * security_sb_eat_lsm_opts() - Consume LSM mount options
1352 * @options: mount options
1353 * @mnt_opts: LSM processed mount options
1355 * Eat (scan @options) and save them in @mnt_opts.
1357 * Return: Returns 0 on success, negative values on failure.
1359 int security_sb_eat_lsm_opts(char *options
, void **mnt_opts
)
1361 return call_int_hook(sb_eat_lsm_opts
, options
, mnt_opts
);
1363 EXPORT_SYMBOL(security_sb_eat_lsm_opts
);
1366 * security_sb_mnt_opts_compat() - Check if new mount options are allowed
1367 * @sb: filesystem superblock
1368 * @mnt_opts: new mount options
1370 * Determine if the new mount options in @mnt_opts are allowed given the
1371 * existing mounted filesystem at @sb. @sb superblock being compared.
1373 * Return: Returns 0 if options are compatible.
1375 int security_sb_mnt_opts_compat(struct super_block
*sb
,
1378 return call_int_hook(sb_mnt_opts_compat
, sb
, mnt_opts
);
1380 EXPORT_SYMBOL(security_sb_mnt_opts_compat
);
1383 * security_sb_remount() - Verify no incompatible mount changes during remount
1384 * @sb: filesystem superblock
1385 * @mnt_opts: (re)mount options
1387 * Extracts security system specific mount options and verifies no changes are
1388 * being made to those options.
1390 * Return: Returns 0 if permission is granted.
1392 int security_sb_remount(struct super_block
*sb
,
1395 return call_int_hook(sb_remount
, sb
, mnt_opts
);
1397 EXPORT_SYMBOL(security_sb_remount
);
1400 * security_sb_kern_mount() - Check if a kernel mount is allowed
1401 * @sb: filesystem superblock
1403 * Mount this @sb if allowed by permissions.
1405 * Return: Returns 0 if permission is granted.
1407 int security_sb_kern_mount(const struct super_block
*sb
)
1409 return call_int_hook(sb_kern_mount
, sb
);
1413 * security_sb_show_options() - Output the mount options for a superblock
1415 * @sb: filesystem superblock
1417 * Show (print on @m) mount options for this @sb.
1419 * Return: Returns 0 on success, negative values on failure.
1421 int security_sb_show_options(struct seq_file
*m
, struct super_block
*sb
)
1423 return call_int_hook(sb_show_options
, m
, sb
);
1427 * security_sb_statfs() - Check if accessing fs stats is allowed
1428 * @dentry: superblock handle
1430 * Check permission before obtaining filesystem statistics for the @mnt
1431 * mountpoint. @dentry is a handle on the superblock for the filesystem.
1433 * Return: Returns 0 if permission is granted.
1435 int security_sb_statfs(struct dentry
*dentry
)
1437 return call_int_hook(sb_statfs
, dentry
);
1441 * security_sb_mount() - Check permission for mounting a filesystem
1442 * @dev_name: filesystem backing device
1443 * @path: mount point
1444 * @type: filesystem type
1445 * @flags: mount flags
1446 * @data: filesystem specific data
1448 * Check permission before an object specified by @dev_name is mounted on the
1449 * mount point named by @nd. For an ordinary mount, @dev_name identifies a
1450 * device if the file system type requires a device. For a remount
1451 * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
1452 * (@flags & MS_BIND), @dev_name identifies the pathname of the object being
1455 * Return: Returns 0 if permission is granted.
1457 int security_sb_mount(const char *dev_name
, const struct path
*path
,
1458 const char *type
, unsigned long flags
, void *data
)
1460 return call_int_hook(sb_mount
, dev_name
, path
, type
, flags
, data
);
1464 * security_sb_umount() - Check permission for unmounting a filesystem
1465 * @mnt: mounted filesystem
1466 * @flags: unmount flags
1468 * Check permission before the @mnt file system is unmounted.
1470 * Return: Returns 0 if permission is granted.
1472 int security_sb_umount(struct vfsmount
*mnt
, int flags
)
1474 return call_int_hook(sb_umount
, mnt
, flags
);
1478 * security_sb_pivotroot() - Check permissions for pivoting the rootfs
1479 * @old_path: new location for current rootfs
1480 * @new_path: location of the new rootfs
1482 * Check permission before pivoting the root filesystem.
1484 * Return: Returns 0 if permission is granted.
1486 int security_sb_pivotroot(const struct path
*old_path
,
1487 const struct path
*new_path
)
1489 return call_int_hook(sb_pivotroot
, old_path
, new_path
);
1493 * security_sb_set_mnt_opts() - Set the mount options for a filesystem
1494 * @sb: filesystem superblock
1495 * @mnt_opts: binary mount options
1496 * @kern_flags: kernel flags (in)
1497 * @set_kern_flags: kernel flags (out)
1499 * Set the security relevant mount options used for a superblock.
1501 * Return: Returns 0 on success, error on failure.
1503 int security_sb_set_mnt_opts(struct super_block
*sb
,
1505 unsigned long kern_flags
,
1506 unsigned long *set_kern_flags
)
1508 struct security_hook_list
*hp
;
1509 int rc
= mnt_opts
? -EOPNOTSUPP
: LSM_RET_DEFAULT(sb_set_mnt_opts
);
1511 hlist_for_each_entry(hp
, &security_hook_heads
.sb_set_mnt_opts
,
1513 rc
= hp
->hook
.sb_set_mnt_opts(sb
, mnt_opts
, kern_flags
,
1515 if (rc
!= LSM_RET_DEFAULT(sb_set_mnt_opts
))
1520 EXPORT_SYMBOL(security_sb_set_mnt_opts
);
1523 * security_sb_clone_mnt_opts() - Duplicate superblock mount options
1524 * @oldsb: source superblock
1525 * @newsb: destination superblock
1526 * @kern_flags: kernel flags (in)
1527 * @set_kern_flags: kernel flags (out)
1529 * Copy all security options from a given superblock to another.
1531 * Return: Returns 0 on success, error on failure.
1533 int security_sb_clone_mnt_opts(const struct super_block
*oldsb
,
1534 struct super_block
*newsb
,
1535 unsigned long kern_flags
,
1536 unsigned long *set_kern_flags
)
1538 return call_int_hook(sb_clone_mnt_opts
, oldsb
, newsb
,
1539 kern_flags
, set_kern_flags
);
1541 EXPORT_SYMBOL(security_sb_clone_mnt_opts
);
1544 * security_move_mount() - Check permissions for moving a mount
1545 * @from_path: source mount point
1546 * @to_path: destination mount point
1548 * Check permission before a mount is moved.
1550 * Return: Returns 0 if permission is granted.
1552 int security_move_mount(const struct path
*from_path
,
1553 const struct path
*to_path
)
1555 return call_int_hook(move_mount
, from_path
, to_path
);
1559 * security_path_notify() - Check if setting a watch is allowed
1562 * @obj_type: file path type
1564 * Check permissions before setting a watch on events as defined by @mask, on
1565 * an object at @path, whose type is defined by @obj_type.
1567 * Return: Returns 0 if permission is granted.
1569 int security_path_notify(const struct path
*path
, u64 mask
,
1570 unsigned int obj_type
)
1572 return call_int_hook(path_notify
, path
, mask
, obj_type
);
1576 * security_inode_alloc() - Allocate an inode LSM blob
1579 * Allocate and attach a security structure to @inode->i_security. The
1580 * i_security field is initialized to NULL when the inode structure is
1583 * Return: Return 0 if operation was successful.
1585 int security_inode_alloc(struct inode
*inode
)
1587 int rc
= lsm_inode_alloc(inode
);
1591 rc
= call_int_hook(inode_alloc_security
, inode
);
1593 security_inode_free(inode
);
1597 static void inode_free_by_rcu(struct rcu_head
*head
)
1600 * The rcu head is at the start of the inode blob
1602 kmem_cache_free(lsm_inode_cache
, head
);
1606 * security_inode_free() - Free an inode's LSM blob
1609 * Deallocate the inode security structure and set @inode->i_security to NULL.
1611 void security_inode_free(struct inode
*inode
)
1613 call_void_hook(inode_free_security
, inode
);
1615 * The inode may still be referenced in a path walk and
1616 * a call to security_inode_permission() can be made
1617 * after inode_free_security() is called. Ideally, the VFS
1618 * wouldn't do this, but fixing that is a much harder
1619 * job. For now, simply free the i_security via RCU, and
1620 * leave the current inode->i_security pointer intact.
1621 * The inode will be freed after the RCU grace period too.
1623 if (inode
->i_security
)
1624 call_rcu((struct rcu_head
*)inode
->i_security
,
1629 * security_dentry_init_security() - Perform dentry initialization
1630 * @dentry: the dentry to initialize
1631 * @mode: mode used to determine resource type
1632 * @name: name of the last path component
1633 * @xattr_name: name of the security/LSM xattr
1634 * @ctx: pointer to the resulting LSM context
1635 * @ctxlen: length of @ctx
1637 * Compute a context for a dentry as the inode is not yet available since NFSv4
1638 * has no label backed by an EA anyway. It is important to note that
1639 * @xattr_name does not need to be free'd by the caller, it is a static string.
1641 * Return: Returns 0 on success, negative values on failure.
1643 int security_dentry_init_security(struct dentry
*dentry
, int mode
,
1644 const struct qstr
*name
,
1645 const char **xattr_name
, void **ctx
,
1648 return call_int_hook(dentry_init_security
, dentry
, mode
, name
,
1649 xattr_name
, ctx
, ctxlen
);
1651 EXPORT_SYMBOL(security_dentry_init_security
);
1654 * security_dentry_create_files_as() - Perform dentry initialization
1655 * @dentry: the dentry to initialize
1656 * @mode: mode used to determine resource type
1657 * @name: name of the last path component
1658 * @old: creds to use for LSM context calculations
1659 * @new: creds to modify
1661 * Compute a context for a dentry as the inode is not yet available and set
1662 * that context in passed in creds so that new files are created using that
1663 * context. Context is calculated using the passed in creds and not the creds
1666 * Return: Returns 0 on success, error on failure.
1668 int security_dentry_create_files_as(struct dentry
*dentry
, int mode
,
1670 const struct cred
*old
, struct cred
*new)
1672 return call_int_hook(dentry_create_files_as
, dentry
, mode
,
1675 EXPORT_SYMBOL(security_dentry_create_files_as
);
1678 * security_inode_init_security() - Initialize an inode's LSM context
1680 * @dir: parent directory
1681 * @qstr: last component of the pathname
1682 * @initxattrs: callback function to write xattrs
1683 * @fs_data: filesystem specific data
1685 * Obtain the security attribute name suffix and value to set on a newly
1686 * created inode and set up the incore security field for the new inode. This
1687 * hook is called by the fs code as part of the inode creation transaction and
1688 * provides for atomic labeling of the inode, unlike the post_create/mkdir/...
1689 * hooks called by the VFS.
1691 * The hook function is expected to populate the xattrs array, by calling
1692 * lsm_get_xattr_slot() to retrieve the slots reserved by the security module
1693 * with the lbs_xattr_count field of the lsm_blob_sizes structure. For each
1694 * slot, the hook function should set ->name to the attribute name suffix
1695 * (e.g. selinux), to allocate ->value (will be freed by the caller) and set it
1696 * to the attribute value, to set ->value_len to the length of the value. If
1697 * the security module does not use security attributes or does not wish to put
1698 * a security attribute on this particular inode, then it should return
1699 * -EOPNOTSUPP to skip this processing.
1701 * Return: Returns 0 if the LSM successfully initialized all of the inode
1702 * security attributes that are required, negative values otherwise.
1704 int security_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1705 const struct qstr
*qstr
,
1706 const initxattrs initxattrs
, void *fs_data
)
1708 struct security_hook_list
*hp
;
1709 struct xattr
*new_xattrs
= NULL
;
1710 int ret
= -EOPNOTSUPP
, xattr_count
= 0;
1712 if (unlikely(IS_PRIVATE(inode
)))
1715 if (!blob_sizes
.lbs_xattr_count
)
1719 /* Allocate +1 as terminator. */
1720 new_xattrs
= kcalloc(blob_sizes
.lbs_xattr_count
+ 1,
1721 sizeof(*new_xattrs
), GFP_NOFS
);
1726 hlist_for_each_entry(hp
, &security_hook_heads
.inode_init_security
,
1728 ret
= hp
->hook
.inode_init_security(inode
, dir
, qstr
, new_xattrs
,
1730 if (ret
&& ret
!= -EOPNOTSUPP
)
1733 * As documented in lsm_hooks.h, -EOPNOTSUPP in this context
1734 * means that the LSM is not willing to provide an xattr, not
1735 * that it wants to signal an error. Thus, continue to invoke
1736 * the remaining LSMs.
1740 /* If initxattrs() is NULL, xattr_count is zero, skip the call. */
1744 ret
= initxattrs(inode
, new_xattrs
, fs_data
);
1746 for (; xattr_count
> 0; xattr_count
--)
1747 kfree(new_xattrs
[xattr_count
- 1].value
);
1749 return (ret
== -EOPNOTSUPP
) ? 0 : ret
;
1751 EXPORT_SYMBOL(security_inode_init_security
);
1754 * security_inode_init_security_anon() - Initialize an anonymous inode
1756 * @name: the anonymous inode class
1757 * @context_inode: an optional related inode
1759 * Set up the incore security field for the new anonymous inode and return
1760 * whether the inode creation is permitted by the security module or not.
1762 * Return: Returns 0 on success, -EACCES if the security module denies the
1763 * creation of this inode, or another -errno upon other errors.
1765 int security_inode_init_security_anon(struct inode
*inode
,
1766 const struct qstr
*name
,
1767 const struct inode
*context_inode
)
1769 return call_int_hook(inode_init_security_anon
, inode
, name
,
1773 #ifdef CONFIG_SECURITY_PATH
1775 * security_path_mknod() - Check if creating a special file is allowed
1776 * @dir: parent directory
1778 * @mode: new file mode
1779 * @dev: device number
1781 * Check permissions when creating a file. Note that this hook is called even
1782 * if mknod operation is being done for a regular file.
1784 * Return: Returns 0 if permission is granted.
1786 int security_path_mknod(const struct path
*dir
, struct dentry
*dentry
,
1787 umode_t mode
, unsigned int dev
)
1789 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1791 return call_int_hook(path_mknod
, dir
, dentry
, mode
, dev
);
1793 EXPORT_SYMBOL(security_path_mknod
);
1796 * security_path_post_mknod() - Update inode security after reg file creation
1797 * @idmap: idmap of the mount
1800 * Update inode security field after a regular file has been created.
1802 void security_path_post_mknod(struct mnt_idmap
*idmap
, struct dentry
*dentry
)
1804 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1806 call_void_hook(path_post_mknod
, idmap
, dentry
);
1810 * security_path_mkdir() - Check if creating a new directory is allowed
1811 * @dir: parent directory
1812 * @dentry: new directory
1813 * @mode: new directory mode
1815 * Check permissions to create a new directory in the existing directory.
1817 * Return: Returns 0 if permission is granted.
1819 int security_path_mkdir(const struct path
*dir
, struct dentry
*dentry
,
1822 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1824 return call_int_hook(path_mkdir
, dir
, dentry
, mode
);
1826 EXPORT_SYMBOL(security_path_mkdir
);
1829 * security_path_rmdir() - Check if removing a directory is allowed
1830 * @dir: parent directory
1831 * @dentry: directory to remove
1833 * Check the permission to remove a directory.
1835 * Return: Returns 0 if permission is granted.
1837 int security_path_rmdir(const struct path
*dir
, struct dentry
*dentry
)
1839 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1841 return call_int_hook(path_rmdir
, dir
, dentry
);
1845 * security_path_unlink() - Check if removing a hard link is allowed
1846 * @dir: parent directory
1849 * Check the permission to remove a hard link to a file.
1851 * Return: Returns 0 if permission is granted.
1853 int security_path_unlink(const struct path
*dir
, struct dentry
*dentry
)
1855 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1857 return call_int_hook(path_unlink
, dir
, dentry
);
1859 EXPORT_SYMBOL(security_path_unlink
);
1862 * security_path_symlink() - Check if creating a symbolic link is allowed
1863 * @dir: parent directory
1864 * @dentry: symbolic link
1865 * @old_name: file pathname
1867 * Check the permission to create a symbolic link to a file.
1869 * Return: Returns 0 if permission is granted.
1871 int security_path_symlink(const struct path
*dir
, struct dentry
*dentry
,
1872 const char *old_name
)
1874 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1876 return call_int_hook(path_symlink
, dir
, dentry
, old_name
);
1880 * security_path_link - Check if creating a hard link is allowed
1881 * @old_dentry: existing file
1882 * @new_dir: new parent directory
1883 * @new_dentry: new link
1885 * Check permission before creating a new hard link to a file.
1887 * Return: Returns 0 if permission is granted.
1889 int security_path_link(struct dentry
*old_dentry
, const struct path
*new_dir
,
1890 struct dentry
*new_dentry
)
1892 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
))))
1894 return call_int_hook(path_link
, old_dentry
, new_dir
, new_dentry
);
1898 * security_path_rename() - Check if renaming a file is allowed
1899 * @old_dir: parent directory of the old file
1900 * @old_dentry: the old file
1901 * @new_dir: parent directory of the new file
1902 * @new_dentry: the new file
1905 * Check for permission to rename a file or directory.
1907 * Return: Returns 0 if permission is granted.
1909 int security_path_rename(const struct path
*old_dir
, struct dentry
*old_dentry
,
1910 const struct path
*new_dir
, struct dentry
*new_dentry
,
1913 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
)) ||
1914 (d_is_positive(new_dentry
) &&
1915 IS_PRIVATE(d_backing_inode(new_dentry
)))))
1918 return call_int_hook(path_rename
, old_dir
, old_dentry
, new_dir
,
1921 EXPORT_SYMBOL(security_path_rename
);
1924 * security_path_truncate() - Check if truncating a file is allowed
1927 * Check permission before truncating the file indicated by path. Note that
1928 * truncation permissions may also be checked based on already opened files,
1929 * using the security_file_truncate() hook.
1931 * Return: Returns 0 if permission is granted.
1933 int security_path_truncate(const struct path
*path
)
1935 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1937 return call_int_hook(path_truncate
, path
);
1941 * security_path_chmod() - Check if changing the file's mode is allowed
1945 * Check for permission to change a mode of the file @path. The new mode is
1946 * specified in @mode which is a bitmask of constants from
1947 * <include/uapi/linux/stat.h>.
1949 * Return: Returns 0 if permission is granted.
1951 int security_path_chmod(const struct path
*path
, umode_t mode
)
1953 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1955 return call_int_hook(path_chmod
, path
, mode
);
1959 * security_path_chown() - Check if changing the file's owner/group is allowed
1964 * Check for permission to change owner/group of a file or directory.
1966 * Return: Returns 0 if permission is granted.
1968 int security_path_chown(const struct path
*path
, kuid_t uid
, kgid_t gid
)
1970 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1972 return call_int_hook(path_chown
, path
, uid
, gid
);
1976 * security_path_chroot() - Check if changing the root directory is allowed
1979 * Check for permission to change root directory.
1981 * Return: Returns 0 if permission is granted.
1983 int security_path_chroot(const struct path
*path
)
1985 return call_int_hook(path_chroot
, path
);
1987 #endif /* CONFIG_SECURITY_PATH */
1990 * security_inode_create() - Check if creating a file is allowed
1991 * @dir: the parent directory
1992 * @dentry: the file being created
1993 * @mode: requested file mode
1995 * Check permission to create a regular file.
1997 * Return: Returns 0 if permission is granted.
1999 int security_inode_create(struct inode
*dir
, struct dentry
*dentry
,
2002 if (unlikely(IS_PRIVATE(dir
)))
2004 return call_int_hook(inode_create
, dir
, dentry
, mode
);
2006 EXPORT_SYMBOL_GPL(security_inode_create
);
2009 * security_inode_post_create_tmpfile() - Update inode security of new tmpfile
2010 * @idmap: idmap of the mount
2011 * @inode: inode of the new tmpfile
2013 * Update inode security data after a tmpfile has been created.
2015 void security_inode_post_create_tmpfile(struct mnt_idmap
*idmap
,
2016 struct inode
*inode
)
2018 if (unlikely(IS_PRIVATE(inode
)))
2020 call_void_hook(inode_post_create_tmpfile
, idmap
, inode
);
2024 * security_inode_link() - Check if creating a hard link is allowed
2025 * @old_dentry: existing file
2026 * @dir: new parent directory
2027 * @new_dentry: new link
2029 * Check permission before creating a new hard link to a file.
2031 * Return: Returns 0 if permission is granted.
2033 int security_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
2034 struct dentry
*new_dentry
)
2036 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
))))
2038 return call_int_hook(inode_link
, old_dentry
, dir
, new_dentry
);
2042 * security_inode_unlink() - Check if removing a hard link is allowed
2043 * @dir: parent directory
2046 * Check the permission to remove a hard link to a file.
2048 * Return: Returns 0 if permission is granted.
2050 int security_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
2052 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2054 return call_int_hook(inode_unlink
, dir
, dentry
);
2058 * security_inode_symlink() - Check if creating a symbolic link is allowed
2059 * @dir: parent directory
2060 * @dentry: symbolic link
2061 * @old_name: existing filename
2063 * Check the permission to create a symbolic link to a file.
2065 * Return: Returns 0 if permission is granted.
2067 int security_inode_symlink(struct inode
*dir
, struct dentry
*dentry
,
2068 const char *old_name
)
2070 if (unlikely(IS_PRIVATE(dir
)))
2072 return call_int_hook(inode_symlink
, dir
, dentry
, old_name
);
2076 * security_inode_mkdir() - Check if creation a new director is allowed
2077 * @dir: parent directory
2078 * @dentry: new directory
2079 * @mode: new directory mode
2081 * Check permissions to create a new directory in the existing directory
2082 * associated with inode structure @dir.
2084 * Return: Returns 0 if permission is granted.
2086 int security_inode_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
2088 if (unlikely(IS_PRIVATE(dir
)))
2090 return call_int_hook(inode_mkdir
, dir
, dentry
, mode
);
2092 EXPORT_SYMBOL_GPL(security_inode_mkdir
);
2095 * security_inode_rmdir() - Check if removing a directory is allowed
2096 * @dir: parent directory
2097 * @dentry: directory to be removed
2099 * Check the permission to remove a directory.
2101 * Return: Returns 0 if permission is granted.
2103 int security_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
2105 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2107 return call_int_hook(inode_rmdir
, dir
, dentry
);
2111 * security_inode_mknod() - Check if creating a special file is allowed
2112 * @dir: parent directory
2114 * @mode: new file mode
2115 * @dev: device number
2117 * Check permissions when creating a special file (or a socket or a fifo file
2118 * created via the mknod system call). Note that if mknod operation is being
2119 * done for a regular file, then the create hook will be called and not this
2122 * Return: Returns 0 if permission is granted.
2124 int security_inode_mknod(struct inode
*dir
, struct dentry
*dentry
,
2125 umode_t mode
, dev_t dev
)
2127 if (unlikely(IS_PRIVATE(dir
)))
2129 return call_int_hook(inode_mknod
, dir
, dentry
, mode
, dev
);
2133 * security_inode_rename() - Check if renaming a file is allowed
2134 * @old_dir: parent directory of the old file
2135 * @old_dentry: the old file
2136 * @new_dir: parent directory of the new file
2137 * @new_dentry: the new file
2140 * Check for permission to rename a file or directory.
2142 * Return: Returns 0 if permission is granted.
2144 int security_inode_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
2145 struct inode
*new_dir
, struct dentry
*new_dentry
,
2148 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
)) ||
2149 (d_is_positive(new_dentry
) &&
2150 IS_PRIVATE(d_backing_inode(new_dentry
)))))
2153 if (flags
& RENAME_EXCHANGE
) {
2154 int err
= call_int_hook(inode_rename
, new_dir
, new_dentry
,
2155 old_dir
, old_dentry
);
2160 return call_int_hook(inode_rename
, old_dir
, old_dentry
,
2161 new_dir
, new_dentry
);
2165 * security_inode_readlink() - Check if reading a symbolic link is allowed
2168 * Check the permission to read the symbolic link.
2170 * Return: Returns 0 if permission is granted.
2172 int security_inode_readlink(struct dentry
*dentry
)
2174 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2176 return call_int_hook(inode_readlink
, dentry
);
2180 * security_inode_follow_link() - Check if following a symbolic link is allowed
2181 * @dentry: link dentry
2182 * @inode: link inode
2183 * @rcu: true if in RCU-walk mode
2185 * Check permission to follow a symbolic link when looking up a pathname. If
2186 * @rcu is true, @inode is not stable.
2188 * Return: Returns 0 if permission is granted.
2190 int security_inode_follow_link(struct dentry
*dentry
, struct inode
*inode
,
2193 if (unlikely(IS_PRIVATE(inode
)))
2195 return call_int_hook(inode_follow_link
, dentry
, inode
, rcu
);
2199 * security_inode_permission() - Check if accessing an inode is allowed
2201 * @mask: access mask
2203 * Check permission before accessing an inode. This hook is called by the
2204 * existing Linux permission function, so a security module can use it to
2205 * provide additional checking for existing Linux permission checks. Notice
2206 * that this hook is called when a file is opened (as well as many other
2207 * operations), whereas the file_security_ops permission hook is called when
2208 * the actual read/write operations are performed.
2210 * Return: Returns 0 if permission is granted.
2212 int security_inode_permission(struct inode
*inode
, int mask
)
2214 if (unlikely(IS_PRIVATE(inode
)))
2216 return call_int_hook(inode_permission
, inode
, mask
);
2220 * security_inode_setattr() - Check if setting file attributes is allowed
2221 * @idmap: idmap of the mount
2223 * @attr: new attributes
2225 * Check permission before setting file attributes. Note that the kernel call
2226 * to notify_change is performed from several locations, whenever file
2227 * attributes change (such as when a file is truncated, chown/chmod operations,
2228 * transferring disk quotas, etc).
2230 * Return: Returns 0 if permission is granted.
2232 int security_inode_setattr(struct mnt_idmap
*idmap
,
2233 struct dentry
*dentry
, struct iattr
*attr
)
2235 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2237 return call_int_hook(inode_setattr
, idmap
, dentry
, attr
);
2239 EXPORT_SYMBOL_GPL(security_inode_setattr
);
2242 * security_inode_post_setattr() - Update the inode after a setattr operation
2243 * @idmap: idmap of the mount
2245 * @ia_valid: file attributes set
2247 * Update inode security field after successful setting file attributes.
2249 void security_inode_post_setattr(struct mnt_idmap
*idmap
, struct dentry
*dentry
,
2252 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2254 call_void_hook(inode_post_setattr
, idmap
, dentry
, ia_valid
);
2258 * security_inode_getattr() - Check if getting file attributes is allowed
2261 * Check permission before obtaining file attributes.
2263 * Return: Returns 0 if permission is granted.
2265 int security_inode_getattr(const struct path
*path
)
2267 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
2269 return call_int_hook(inode_getattr
, path
);
2273 * security_inode_setxattr() - Check if setting file xattrs is allowed
2274 * @idmap: idmap of the mount
2277 * @value: xattr value
2278 * @size: size of xattr value
2281 * This hook performs the desired permission checks before setting the extended
2282 * attributes (xattrs) on @dentry. It is important to note that we have some
2283 * additional logic before the main LSM implementation calls to detect if we
2284 * need to perform an additional capability check at the LSM layer.
2286 * Normally we enforce a capability check prior to executing the various LSM
2287 * hook implementations, but if a LSM wants to avoid this capability check,
2288 * it can register a 'inode_xattr_skipcap' hook and return a value of 1 for
2289 * xattrs that it wants to avoid the capability check, leaving the LSM fully
2290 * responsible for enforcing the access control for the specific xattr. If all
2291 * of the enabled LSMs refrain from registering a 'inode_xattr_skipcap' hook,
2292 * or return a 0 (the default return value), the capability check is still
2293 * performed. If no 'inode_xattr_skipcap' hooks are registered the capability
2294 * check is performed.
2296 * Return: Returns 0 if permission is granted.
2298 int security_inode_setxattr(struct mnt_idmap
*idmap
,
2299 struct dentry
*dentry
, const char *name
,
2300 const void *value
, size_t size
, int flags
)
2304 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2307 /* enforce the capability checks at the lsm layer, if needed */
2308 if (!call_int_hook(inode_xattr_skipcap
, name
)) {
2309 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
2314 return call_int_hook(inode_setxattr
, idmap
, dentry
, name
, value
, size
,
2319 * security_inode_set_acl() - Check if setting posix acls is allowed
2320 * @idmap: idmap of the mount
2322 * @acl_name: acl name
2325 * Check permission before setting posix acls, the posix acls in @kacl are
2326 * identified by @acl_name.
2328 * Return: Returns 0 if permission is granted.
2330 int security_inode_set_acl(struct mnt_idmap
*idmap
,
2331 struct dentry
*dentry
, const char *acl_name
,
2332 struct posix_acl
*kacl
)
2334 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2336 return call_int_hook(inode_set_acl
, idmap
, dentry
, acl_name
, kacl
);
2340 * security_inode_post_set_acl() - Update inode security from posix acls set
2342 * @acl_name: acl name
2345 * Update inode security data after successfully setting posix acls on @dentry.
2346 * The posix acls in @kacl are identified by @acl_name.
2348 void security_inode_post_set_acl(struct dentry
*dentry
, const char *acl_name
,
2349 struct posix_acl
*kacl
)
2351 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2353 call_void_hook(inode_post_set_acl
, dentry
, acl_name
, kacl
);
2357 * security_inode_get_acl() - Check if reading posix acls is allowed
2358 * @idmap: idmap of the mount
2360 * @acl_name: acl name
2362 * Check permission before getting osix acls, the posix acls are identified by
2365 * Return: Returns 0 if permission is granted.
2367 int security_inode_get_acl(struct mnt_idmap
*idmap
,
2368 struct dentry
*dentry
, const char *acl_name
)
2370 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2372 return call_int_hook(inode_get_acl
, idmap
, dentry
, acl_name
);
2376 * security_inode_remove_acl() - Check if removing a posix acl is allowed
2377 * @idmap: idmap of the mount
2379 * @acl_name: acl name
2381 * Check permission before removing posix acls, the posix acls are identified
2384 * Return: Returns 0 if permission is granted.
2386 int security_inode_remove_acl(struct mnt_idmap
*idmap
,
2387 struct dentry
*dentry
, const char *acl_name
)
2389 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2391 return call_int_hook(inode_remove_acl
, idmap
, dentry
, acl_name
);
2395 * security_inode_post_remove_acl() - Update inode security after rm posix acls
2396 * @idmap: idmap of the mount
2398 * @acl_name: acl name
2400 * Update inode security data after successfully removing posix acls on
2401 * @dentry in @idmap. The posix acls are identified by @acl_name.
2403 void security_inode_post_remove_acl(struct mnt_idmap
*idmap
,
2404 struct dentry
*dentry
, const char *acl_name
)
2406 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2408 call_void_hook(inode_post_remove_acl
, idmap
, dentry
, acl_name
);
2412 * security_inode_post_setxattr() - Update the inode after a setxattr operation
2415 * @value: xattr value
2416 * @size: xattr value size
2419 * Update inode security field after successful setxattr operation.
2421 void security_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
2422 const void *value
, size_t size
, int flags
)
2424 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2426 call_void_hook(inode_post_setxattr
, dentry
, name
, value
, size
, flags
);
2430 * security_inode_getxattr() - Check if xattr access is allowed
2434 * Check permission before obtaining the extended attributes identified by
2435 * @name for @dentry.
2437 * Return: Returns 0 if permission is granted.
2439 int security_inode_getxattr(struct dentry
*dentry
, const char *name
)
2441 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2443 return call_int_hook(inode_getxattr
, dentry
, name
);
2447 * security_inode_listxattr() - Check if listing xattrs is allowed
2450 * Check permission before obtaining the list of extended attribute names for
2453 * Return: Returns 0 if permission is granted.
2455 int security_inode_listxattr(struct dentry
*dentry
)
2457 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2459 return call_int_hook(inode_listxattr
, dentry
);
2463 * security_inode_removexattr() - Check if removing an xattr is allowed
2464 * @idmap: idmap of the mount
2468 * This hook performs the desired permission checks before setting the extended
2469 * attributes (xattrs) on @dentry. It is important to note that we have some
2470 * additional logic before the main LSM implementation calls to detect if we
2471 * need to perform an additional capability check at the LSM layer.
2473 * Normally we enforce a capability check prior to executing the various LSM
2474 * hook implementations, but if a LSM wants to avoid this capability check,
2475 * it can register a 'inode_xattr_skipcap' hook and return a value of 1 for
2476 * xattrs that it wants to avoid the capability check, leaving the LSM fully
2477 * responsible for enforcing the access control for the specific xattr. If all
2478 * of the enabled LSMs refrain from registering a 'inode_xattr_skipcap' hook,
2479 * or return a 0 (the default return value), the capability check is still
2480 * performed. If no 'inode_xattr_skipcap' hooks are registered the capability
2481 * check is performed.
2483 * Return: Returns 0 if permission is granted.
2485 int security_inode_removexattr(struct mnt_idmap
*idmap
,
2486 struct dentry
*dentry
, const char *name
)
2490 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2493 /* enforce the capability checks at the lsm layer, if needed */
2494 if (!call_int_hook(inode_xattr_skipcap
, name
)) {
2495 rc
= cap_inode_removexattr(idmap
, dentry
, name
);
2500 return call_int_hook(inode_removexattr
, idmap
, dentry
, name
);
2504 * security_inode_post_removexattr() - Update the inode after a removexattr op
2508 * Update the inode after a successful removexattr operation.
2510 void security_inode_post_removexattr(struct dentry
*dentry
, const char *name
)
2512 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
2514 call_void_hook(inode_post_removexattr
, dentry
, name
);
2518 * security_inode_need_killpriv() - Check if security_inode_killpriv() required
2519 * @dentry: associated dentry
2521 * Called when an inode has been changed to determine if
2522 * security_inode_killpriv() should be called.
2524 * Return: Return <0 on error to abort the inode change operation, return 0 if
2525 * security_inode_killpriv() does not need to be called, return >0 if
2526 * security_inode_killpriv() does need to be called.
2528 int security_inode_need_killpriv(struct dentry
*dentry
)
2530 return call_int_hook(inode_need_killpriv
, dentry
);
2534 * security_inode_killpriv() - The setuid bit is removed, update LSM state
2535 * @idmap: idmap of the mount
2536 * @dentry: associated dentry
2538 * The @dentry's setuid bit is being removed. Remove similar security labels.
2539 * Called with the dentry->d_inode->i_mutex held.
2541 * Return: Return 0 on success. If error is returned, then the operation
2542 * causing setuid bit removal is failed.
2544 int security_inode_killpriv(struct mnt_idmap
*idmap
,
2545 struct dentry
*dentry
)
2547 return call_int_hook(inode_killpriv
, idmap
, dentry
);
2551 * security_inode_getsecurity() - Get the xattr security label of an inode
2552 * @idmap: idmap of the mount
2555 * @buffer: security label buffer
2556 * @alloc: allocation flag
2558 * Retrieve a copy of the extended attribute representation of the security
2559 * label associated with @name for @inode via @buffer. Note that @name is the
2560 * remainder of the attribute name after the security prefix has been removed.
2561 * @alloc is used to specify if the call should return a value via the buffer
2562 * or just the value length.
2564 * Return: Returns size of buffer on success.
2566 int security_inode_getsecurity(struct mnt_idmap
*idmap
,
2567 struct inode
*inode
, const char *name
,
2568 void **buffer
, bool alloc
)
2570 if (unlikely(IS_PRIVATE(inode
)))
2571 return LSM_RET_DEFAULT(inode_getsecurity
);
2573 return call_int_hook(inode_getsecurity
, idmap
, inode
, name
, buffer
,
2578 * security_inode_setsecurity() - Set the xattr security label of an inode
2581 * @value: security label
2582 * @size: length of security label
2585 * Set the security label associated with @name for @inode from the extended
2586 * attribute value @value. @size indicates the size of the @value in bytes.
2587 * @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
2588 * remainder of the attribute name after the security. prefix has been removed.
2590 * Return: Returns 0 on success.
2592 int security_inode_setsecurity(struct inode
*inode
, const char *name
,
2593 const void *value
, size_t size
, int flags
)
2595 if (unlikely(IS_PRIVATE(inode
)))
2596 return LSM_RET_DEFAULT(inode_setsecurity
);
2598 return call_int_hook(inode_setsecurity
, inode
, name
, value
, size
,
2603 * security_inode_listsecurity() - List the xattr security label names
2606 * @buffer_size: size of buffer
2608 * Copy the extended attribute names for the security labels associated with
2609 * @inode into @buffer. The maximum size of @buffer is specified by
2610 * @buffer_size. @buffer may be NULL to request the size of the buffer
2613 * Return: Returns number of bytes used/required on success.
2615 int security_inode_listsecurity(struct inode
*inode
,
2616 char *buffer
, size_t buffer_size
)
2618 if (unlikely(IS_PRIVATE(inode
)))
2620 return call_int_hook(inode_listsecurity
, inode
, buffer
, buffer_size
);
2622 EXPORT_SYMBOL(security_inode_listsecurity
);
2625 * security_inode_getsecid() - Get an inode's secid
2627 * @secid: secid to return
2629 * Get the secid associated with the node. In case of failure, @secid will be
2632 void security_inode_getsecid(struct inode
*inode
, u32
*secid
)
2634 call_void_hook(inode_getsecid
, inode
, secid
);
2638 * security_inode_copy_up() - Create new creds for an overlayfs copy-up op
2639 * @src: union dentry of copy-up file
2640 * @new: newly created creds
2642 * A file is about to be copied up from lower layer to upper layer of overlay
2643 * filesystem. Security module can prepare a set of new creds and modify as
2644 * need be and return new creds. Caller will switch to new creds temporarily to
2645 * create new file and release newly allocated creds.
2647 * Return: Returns 0 on success or a negative error code on error.
2649 int security_inode_copy_up(struct dentry
*src
, struct cred
**new)
2651 return call_int_hook(inode_copy_up
, src
, new);
2653 EXPORT_SYMBOL(security_inode_copy_up
);
2656 * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
2657 * @src: union dentry of copy-up file
2660 * Filter the xattrs being copied up when a unioned file is copied up from a
2661 * lower layer to the union/overlay layer. The caller is responsible for
2662 * reading and writing the xattrs, this hook is merely a filter.
2664 * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
2665 * if the security module does not know about attribute, or a negative
2666 * error code to abort the copy up.
2668 int security_inode_copy_up_xattr(struct dentry
*src
, const char *name
)
2673 * The implementation can return 0 (accept the xattr), 1 (discard the
2674 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
2675 * any other error code in case of an error.
2677 rc
= call_int_hook(inode_copy_up_xattr
, src
, name
);
2678 if (rc
!= LSM_RET_DEFAULT(inode_copy_up_xattr
))
2681 return LSM_RET_DEFAULT(inode_copy_up_xattr
);
2683 EXPORT_SYMBOL(security_inode_copy_up_xattr
);
2686 * security_kernfs_init_security() - Init LSM context for a kernfs node
2687 * @kn_dir: parent kernfs node
2688 * @kn: the kernfs node to initialize
2690 * Initialize the security context of a newly created kernfs node based on its
2691 * own and its parent's attributes.
2693 * Return: Returns 0 if permission is granted.
2695 int security_kernfs_init_security(struct kernfs_node
*kn_dir
,
2696 struct kernfs_node
*kn
)
2698 return call_int_hook(kernfs_init_security
, kn_dir
, kn
);
2702 * security_file_permission() - Check file permissions
2704 * @mask: requested permissions
2706 * Check file permissions before accessing an open file. This hook is called
2707 * by various operations that read or write files. A security module can use
2708 * this hook to perform additional checking on these operations, e.g. to
2709 * revalidate permissions on use to support privilege bracketing or policy
2710 * changes. Notice that this hook is used when the actual read/write
2711 * operations are performed, whereas the inode_security_ops hook is called when
2712 * a file is opened (as well as many other operations). Although this hook can
2713 * be used to revalidate permissions for various system call operations that
2714 * read or write files, it does not address the revalidation of permissions for
2715 * memory-mapped files. Security modules must handle this separately if they
2716 * need such revalidation.
2718 * Return: Returns 0 if permission is granted.
2720 int security_file_permission(struct file
*file
, int mask
)
2722 return call_int_hook(file_permission
, file
, mask
);
2726 * security_file_alloc() - Allocate and init a file's LSM blob
2729 * Allocate and attach a security structure to the file->f_security field. The
2730 * security field is initialized to NULL when the structure is first created.
2732 * Return: Return 0 if the hook is successful and permission is granted.
2734 int security_file_alloc(struct file
*file
)
2736 int rc
= lsm_file_alloc(file
);
2740 rc
= call_int_hook(file_alloc_security
, file
);
2742 security_file_free(file
);
2747 * security_file_release() - Perform actions before releasing the file ref
2750 * Perform actions before releasing the last reference to a file.
2752 void security_file_release(struct file
*file
)
2754 call_void_hook(file_release
, file
);
2758 * security_file_free() - Free a file's LSM blob
2761 * Deallocate and free any security structures stored in file->f_security.
2763 void security_file_free(struct file
*file
)
2767 call_void_hook(file_free_security
, file
);
2769 blob
= file
->f_security
;
2771 file
->f_security
= NULL
;
2772 kmem_cache_free(lsm_file_cache
, blob
);
2777 * security_file_ioctl() - Check if an ioctl is allowed
2778 * @file: associated file
2780 * @arg: ioctl arguments
2782 * Check permission for an ioctl operation on @file. Note that @arg sometimes
2783 * represents a user space pointer; in other cases, it may be a simple integer
2784 * value. When @arg represents a user space pointer, it should never be used
2785 * by the security module.
2787 * Return: Returns 0 if permission is granted.
2789 int security_file_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2791 return call_int_hook(file_ioctl
, file
, cmd
, arg
);
2793 EXPORT_SYMBOL_GPL(security_file_ioctl
);
2796 * security_file_ioctl_compat() - Check if an ioctl is allowed in compat mode
2797 * @file: associated file
2799 * @arg: ioctl arguments
2801 * Compat version of security_file_ioctl() that correctly handles 32-bit
2802 * processes running on 64-bit kernels.
2804 * Return: Returns 0 if permission is granted.
2806 int security_file_ioctl_compat(struct file
*file
, unsigned int cmd
,
2809 return call_int_hook(file_ioctl_compat
, file
, cmd
, arg
);
2811 EXPORT_SYMBOL_GPL(security_file_ioctl_compat
);
2813 static inline unsigned long mmap_prot(struct file
*file
, unsigned long prot
)
2816 * Does we have PROT_READ and does the application expect
2817 * it to imply PROT_EXEC? If not, nothing to talk about...
2819 if ((prot
& (PROT_READ
| PROT_EXEC
)) != PROT_READ
)
2821 if (!(current
->personality
& READ_IMPLIES_EXEC
))
2824 * if that's an anonymous mapping, let it.
2827 return prot
| PROT_EXEC
;
2829 * ditto if it's not on noexec mount, except that on !MMU we need
2830 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
2832 if (!path_noexec(&file
->f_path
)) {
2834 if (file
->f_op
->mmap_capabilities
) {
2835 unsigned caps
= file
->f_op
->mmap_capabilities(file
);
2836 if (!(caps
& NOMMU_MAP_EXEC
))
2840 return prot
| PROT_EXEC
;
2842 /* anything on noexec mount won't get PROT_EXEC */
2847 * security_mmap_file() - Check if mmap'ing a file is allowed
2849 * @prot: protection applied by the kernel
2852 * Check permissions for a mmap operation. The @file may be NULL, e.g. if
2853 * mapping anonymous memory.
2855 * Return: Returns 0 if permission is granted.
2857 int security_mmap_file(struct file
*file
, unsigned long prot
,
2858 unsigned long flags
)
2860 return call_int_hook(mmap_file
, file
, prot
, mmap_prot(file
, prot
),
2865 * security_mmap_addr() - Check if mmap'ing an address is allowed
2868 * Check permissions for a mmap operation at @addr.
2870 * Return: Returns 0 if permission is granted.
2872 int security_mmap_addr(unsigned long addr
)
2874 return call_int_hook(mmap_addr
, addr
);
2878 * security_file_mprotect() - Check if changing memory protections is allowed
2879 * @vma: memory region
2880 * @reqprot: application requested protection
2881 * @prot: protection applied by the kernel
2883 * Check permissions before changing memory access permissions.
2885 * Return: Returns 0 if permission is granted.
2887 int security_file_mprotect(struct vm_area_struct
*vma
, unsigned long reqprot
,
2890 return call_int_hook(file_mprotect
, vma
, reqprot
, prot
);
2894 * security_file_lock() - Check if a file lock is allowed
2896 * @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
2898 * Check permission before performing file locking operations. Note the hook
2899 * mediates both flock and fcntl style locks.
2901 * Return: Returns 0 if permission is granted.
2903 int security_file_lock(struct file
*file
, unsigned int cmd
)
2905 return call_int_hook(file_lock
, file
, cmd
);
2909 * security_file_fcntl() - Check if fcntl() op is allowed
2911 * @cmd: fcntl command
2912 * @arg: command argument
2914 * Check permission before allowing the file operation specified by @cmd from
2915 * being performed on the file @file. Note that @arg sometimes represents a
2916 * user space pointer; in other cases, it may be a simple integer value. When
2917 * @arg represents a user space pointer, it should never be used by the
2920 * Return: Returns 0 if permission is granted.
2922 int security_file_fcntl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2924 return call_int_hook(file_fcntl
, file
, cmd
, arg
);
2928 * security_file_set_fowner() - Set the file owner info in the LSM blob
2931 * Save owner security information (typically from current->security) in
2932 * file->f_security for later use by the send_sigiotask hook.
2934 * Return: Returns 0 on success.
2936 void security_file_set_fowner(struct file
*file
)
2938 call_void_hook(file_set_fowner
, file
);
2942 * security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
2944 * @fown: signal sender
2945 * @sig: signal to be sent, SIGIO is sent if 0
2947 * Check permission for the file owner @fown to send SIGIO or SIGURG to the
2948 * process @tsk. Note that this hook is sometimes called from interrupt. Note
2949 * that the fown_struct, @fown, is never outside the context of a struct file,
2950 * so the file structure (and associated security information) can always be
2951 * obtained: container_of(fown, struct file, f_owner).
2953 * Return: Returns 0 if permission is granted.
2955 int security_file_send_sigiotask(struct task_struct
*tsk
,
2956 struct fown_struct
*fown
, int sig
)
2958 return call_int_hook(file_send_sigiotask
, tsk
, fown
, sig
);
2962 * security_file_receive() - Check if receiving a file via IPC is allowed
2963 * @file: file being received
2965 * This hook allows security modules to control the ability of a process to
2966 * receive an open file descriptor via socket IPC.
2968 * Return: Returns 0 if permission is granted.
2970 int security_file_receive(struct file
*file
)
2972 return call_int_hook(file_receive
, file
);
2976 * security_file_open() - Save open() time state for late use by the LSM
2979 * Save open-time permission checking state for later use upon file_permission,
2980 * and recheck access if anything has changed since inode_permission.
2982 * Return: Returns 0 if permission is granted.
2984 int security_file_open(struct file
*file
)
2988 ret
= call_int_hook(file_open
, file
);
2992 return fsnotify_open_perm(file
);
2996 * security_file_post_open() - Evaluate a file after it has been opened
2998 * @mask: access mask
3000 * Evaluate an opened file and the access mask requested with open(). The hook
3001 * is useful for LSMs that require the file content to be available in order to
3004 * Return: Returns 0 if permission is granted.
3006 int security_file_post_open(struct file
*file
, int mask
)
3008 return call_int_hook(file_post_open
, file
, mask
);
3010 EXPORT_SYMBOL_GPL(security_file_post_open
);
3013 * security_file_truncate() - Check if truncating a file is allowed
3016 * Check permission before truncating a file, i.e. using ftruncate. Note that
3017 * truncation permission may also be checked based on the path, using the
3018 * @path_truncate hook.
3020 * Return: Returns 0 if permission is granted.
3022 int security_file_truncate(struct file
*file
)
3024 return call_int_hook(file_truncate
, file
);
3028 * security_task_alloc() - Allocate a task's LSM blob
3030 * @clone_flags: flags indicating what is being shared
3032 * Handle allocation of task-related resources.
3034 * Return: Returns a zero on success, negative values on failure.
3036 int security_task_alloc(struct task_struct
*task
, unsigned long clone_flags
)
3038 int rc
= lsm_task_alloc(task
);
3042 rc
= call_int_hook(task_alloc
, task
, clone_flags
);
3044 security_task_free(task
);
3049 * security_task_free() - Free a task's LSM blob and related resources
3052 * Handle release of task-related resources. Note that this can be called from
3053 * interrupt context.
3055 void security_task_free(struct task_struct
*task
)
3057 call_void_hook(task_free
, task
);
3059 kfree(task
->security
);
3060 task
->security
= NULL
;
3064 * security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
3065 * @cred: credentials
3068 * Only allocate sufficient memory and attach to @cred such that
3069 * cred_transfer() will not get ENOMEM.
3071 * Return: Returns 0 on success, negative values on failure.
3073 int security_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
3075 int rc
= lsm_cred_alloc(cred
, gfp
);
3080 rc
= call_int_hook(cred_alloc_blank
, cred
, gfp
);
3082 security_cred_free(cred
);
3087 * security_cred_free() - Free the cred's LSM blob and associated resources
3088 * @cred: credentials
3090 * Deallocate and clear the cred->security field in a set of credentials.
3092 void security_cred_free(struct cred
*cred
)
3095 * There is a failure case in prepare_creds() that
3096 * may result in a call here with ->security being NULL.
3098 if (unlikely(cred
->security
== NULL
))
3101 call_void_hook(cred_free
, cred
);
3103 kfree(cred
->security
);
3104 cred
->security
= NULL
;
3108 * security_prepare_creds() - Prepare a new set of credentials
3109 * @new: new credentials
3110 * @old: original credentials
3113 * Prepare a new set of credentials by copying the data from the old set.
3115 * Return: Returns 0 on success, negative values on failure.
3117 int security_prepare_creds(struct cred
*new, const struct cred
*old
, gfp_t gfp
)
3119 int rc
= lsm_cred_alloc(new, gfp
);
3124 rc
= call_int_hook(cred_prepare
, new, old
, gfp
);
3126 security_cred_free(new);
3131 * security_transfer_creds() - Transfer creds
3132 * @new: target credentials
3133 * @old: original credentials
3135 * Transfer data from original creds to new creds.
3137 void security_transfer_creds(struct cred
*new, const struct cred
*old
)
3139 call_void_hook(cred_transfer
, new, old
);
3143 * security_cred_getsecid() - Get the secid from a set of credentials
3145 * @secid: secid value
3147 * Retrieve the security identifier of the cred structure @c. In case of
3148 * failure, @secid will be set to zero.
3150 void security_cred_getsecid(const struct cred
*c
, u32
*secid
)
3153 call_void_hook(cred_getsecid
, c
, secid
);
3155 EXPORT_SYMBOL(security_cred_getsecid
);
3158 * security_kernel_act_as() - Set the kernel credentials to act as secid
3162 * Set the credentials for a kernel service to act as (subjective context).
3163 * The current task must be the one that nominated @secid.
3165 * Return: Returns 0 if successful.
3167 int security_kernel_act_as(struct cred
*new, u32 secid
)
3169 return call_int_hook(kernel_act_as
, new, secid
);
3173 * security_kernel_create_files_as() - Set file creation context using an inode
3174 * @new: target credentials
3175 * @inode: reference inode
3177 * Set the file creation context in a set of credentials to be the same as the
3178 * objective context of the specified inode. The current task must be the one
3179 * that nominated @inode.
3181 * Return: Returns 0 if successful.
3183 int security_kernel_create_files_as(struct cred
*new, struct inode
*inode
)
3185 return call_int_hook(kernel_create_files_as
, new, inode
);
3189 * security_kernel_module_request() - Check if loading a module is allowed
3190 * @kmod_name: module name
3192 * Ability to trigger the kernel to automatically upcall to userspace for
3193 * userspace to load a kernel module with the given name.
3195 * Return: Returns 0 if successful.
3197 int security_kernel_module_request(char *kmod_name
)
3199 return call_int_hook(kernel_module_request
, kmod_name
);
3203 * security_kernel_read_file() - Read a file specified by userspace
3205 * @id: file identifier
3206 * @contents: trust if security_kernel_post_read_file() will be called
3208 * Read a file specified by userspace.
3210 * Return: Returns 0 if permission is granted.
3212 int security_kernel_read_file(struct file
*file
, enum kernel_read_file_id id
,
3215 return call_int_hook(kernel_read_file
, file
, id
, contents
);
3217 EXPORT_SYMBOL_GPL(security_kernel_read_file
);
3220 * security_kernel_post_read_file() - Read a file specified by userspace
3222 * @buf: file contents
3223 * @size: size of file contents
3224 * @id: file identifier
3226 * Read a file specified by userspace. This must be paired with a prior call
3227 * to security_kernel_read_file() call that indicated this hook would also be
3228 * called, see security_kernel_read_file() for more information.
3230 * Return: Returns 0 if permission is granted.
3232 int security_kernel_post_read_file(struct file
*file
, char *buf
, loff_t size
,
3233 enum kernel_read_file_id id
)
3235 return call_int_hook(kernel_post_read_file
, file
, buf
, size
, id
);
3237 EXPORT_SYMBOL_GPL(security_kernel_post_read_file
);
3240 * security_kernel_load_data() - Load data provided by userspace
3241 * @id: data identifier
3242 * @contents: true if security_kernel_post_load_data() will be called
3244 * Load data provided by userspace.
3246 * Return: Returns 0 if permission is granted.
3248 int security_kernel_load_data(enum kernel_load_data_id id
, bool contents
)
3250 return call_int_hook(kernel_load_data
, id
, contents
);
3252 EXPORT_SYMBOL_GPL(security_kernel_load_data
);
3255 * security_kernel_post_load_data() - Load userspace data from a non-file source
3257 * @size: size of data
3258 * @id: data identifier
3259 * @description: text description of data, specific to the id value
3261 * Load data provided by a non-file source (usually userspace buffer). This
3262 * must be paired with a prior security_kernel_load_data() call that indicated
3263 * this hook would also be called, see security_kernel_load_data() for more
3266 * Return: Returns 0 if permission is granted.
3268 int security_kernel_post_load_data(char *buf
, loff_t size
,
3269 enum kernel_load_data_id id
,
3272 return call_int_hook(kernel_post_load_data
, buf
, size
, id
, description
);
3274 EXPORT_SYMBOL_GPL(security_kernel_post_load_data
);
3277 * security_task_fix_setuid() - Update LSM with new user id attributes
3278 * @new: updated credentials
3279 * @old: credentials being replaced
3280 * @flags: LSM_SETID_* flag values
3282 * Update the module's state after setting one or more of the user identity
3283 * attributes of the current process. The @flags parameter indicates which of
3284 * the set*uid system calls invoked this hook. If @new is the set of
3285 * credentials that will be installed. Modifications should be made to this
3286 * rather than to @current->cred.
3288 * Return: Returns 0 on success.
3290 int security_task_fix_setuid(struct cred
*new, const struct cred
*old
,
3293 return call_int_hook(task_fix_setuid
, new, old
, flags
);
3297 * security_task_fix_setgid() - Update LSM with new group id attributes
3298 * @new: updated credentials
3299 * @old: credentials being replaced
3300 * @flags: LSM_SETID_* flag value
3302 * Update the module's state after setting one or more of the group identity
3303 * attributes of the current process. The @flags parameter indicates which of
3304 * the set*gid system calls invoked this hook. @new is the set of credentials
3305 * that will be installed. Modifications should be made to this rather than to
3308 * Return: Returns 0 on success.
3310 int security_task_fix_setgid(struct cred
*new, const struct cred
*old
,
3313 return call_int_hook(task_fix_setgid
, new, old
, flags
);
3317 * security_task_fix_setgroups() - Update LSM with new supplementary groups
3318 * @new: updated credentials
3319 * @old: credentials being replaced
3321 * Update the module's state after setting the supplementary group identity
3322 * attributes of the current process. @new is the set of credentials that will
3323 * be installed. Modifications should be made to this rather than to
3326 * Return: Returns 0 on success.
3328 int security_task_fix_setgroups(struct cred
*new, const struct cred
*old
)
3330 return call_int_hook(task_fix_setgroups
, new, old
);
3334 * security_task_setpgid() - Check if setting the pgid is allowed
3335 * @p: task being modified
3338 * Check permission before setting the process group identifier of the process
3341 * Return: Returns 0 if permission is granted.
3343 int security_task_setpgid(struct task_struct
*p
, pid_t pgid
)
3345 return call_int_hook(task_setpgid
, p
, pgid
);
3349 * security_task_getpgid() - Check if getting the pgid is allowed
3352 * Check permission before getting the process group identifier of the process
3355 * Return: Returns 0 if permission is granted.
3357 int security_task_getpgid(struct task_struct
*p
)
3359 return call_int_hook(task_getpgid
, p
);
3363 * security_task_getsid() - Check if getting the session id is allowed
3366 * Check permission before getting the session identifier of the process @p.
3368 * Return: Returns 0 if permission is granted.
3370 int security_task_getsid(struct task_struct
*p
)
3372 return call_int_hook(task_getsid
, p
);
3376 * security_current_getsecid_subj() - Get the current task's subjective secid
3377 * @secid: secid value
3379 * Retrieve the subjective security identifier of the current task and return
3380 * it in @secid. In case of failure, @secid will be set to zero.
3382 void security_current_getsecid_subj(u32
*secid
)
3385 call_void_hook(current_getsecid_subj
, secid
);
3387 EXPORT_SYMBOL(security_current_getsecid_subj
);
3390 * security_task_getsecid_obj() - Get a task's objective secid
3392 * @secid: secid value
3394 * Retrieve the objective security identifier of the task_struct in @p and
3395 * return it in @secid. In case of failure, @secid will be set to zero.
3397 void security_task_getsecid_obj(struct task_struct
*p
, u32
*secid
)
3400 call_void_hook(task_getsecid_obj
, p
, secid
);
3402 EXPORT_SYMBOL(security_task_getsecid_obj
);
3405 * security_task_setnice() - Check if setting a task's nice value is allowed
3409 * Check permission before setting the nice value of @p to @nice.
3411 * Return: Returns 0 if permission is granted.
3413 int security_task_setnice(struct task_struct
*p
, int nice
)
3415 return call_int_hook(task_setnice
, p
, nice
);
3419 * security_task_setioprio() - Check if setting a task's ioprio is allowed
3421 * @ioprio: ioprio value
3423 * Check permission before setting the ioprio value of @p to @ioprio.
3425 * Return: Returns 0 if permission is granted.
3427 int security_task_setioprio(struct task_struct
*p
, int ioprio
)
3429 return call_int_hook(task_setioprio
, p
, ioprio
);
3433 * security_task_getioprio() - Check if getting a task's ioprio is allowed
3436 * Check permission before getting the ioprio value of @p.
3438 * Return: Returns 0 if permission is granted.
3440 int security_task_getioprio(struct task_struct
*p
)
3442 return call_int_hook(task_getioprio
, p
);
3446 * security_task_prlimit() - Check if get/setting resources limits is allowed
3447 * @cred: current task credentials
3448 * @tcred: target task credentials
3449 * @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
3451 * Check permission before getting and/or setting the resource limits of
3454 * Return: Returns 0 if permission is granted.
3456 int security_task_prlimit(const struct cred
*cred
, const struct cred
*tcred
,
3459 return call_int_hook(task_prlimit
, cred
, tcred
, flags
);
3463 * security_task_setrlimit() - Check if setting a new rlimit value is allowed
3464 * @p: target task's group leader
3465 * @resource: resource whose limit is being set
3466 * @new_rlim: new resource limit
3468 * Check permission before setting the resource limits of process @p for
3469 * @resource to @new_rlim. The old resource limit values can be examined by
3470 * dereferencing (p->signal->rlim + resource).
3472 * Return: Returns 0 if permission is granted.
3474 int security_task_setrlimit(struct task_struct
*p
, unsigned int resource
,
3475 struct rlimit
*new_rlim
)
3477 return call_int_hook(task_setrlimit
, p
, resource
, new_rlim
);
3481 * security_task_setscheduler() - Check if setting sched policy/param is allowed
3484 * Check permission before setting scheduling policy and/or parameters of
3487 * Return: Returns 0 if permission is granted.
3489 int security_task_setscheduler(struct task_struct
*p
)
3491 return call_int_hook(task_setscheduler
, p
);
3495 * security_task_getscheduler() - Check if getting scheduling info is allowed
3498 * Check permission before obtaining scheduling information for process @p.
3500 * Return: Returns 0 if permission is granted.
3502 int security_task_getscheduler(struct task_struct
*p
)
3504 return call_int_hook(task_getscheduler
, p
);
3508 * security_task_movememory() - Check if moving memory is allowed
3511 * Check permission before moving memory owned by process @p.
3513 * Return: Returns 0 if permission is granted.
3515 int security_task_movememory(struct task_struct
*p
)
3517 return call_int_hook(task_movememory
, p
);
3521 * security_task_kill() - Check if sending a signal is allowed
3522 * @p: target process
3523 * @info: signal information
3524 * @sig: signal value
3525 * @cred: credentials of the signal sender, NULL if @current
3527 * Check permission before sending signal @sig to @p. @info can be NULL, the
3528 * constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
3529 * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
3530 * the kernel and should typically be permitted. SIGIO signals are handled
3531 * separately by the send_sigiotask hook in file_security_ops.
3533 * Return: Returns 0 if permission is granted.
3535 int security_task_kill(struct task_struct
*p
, struct kernel_siginfo
*info
,
3536 int sig
, const struct cred
*cred
)
3538 return call_int_hook(task_kill
, p
, info
, sig
, cred
);
3542 * security_task_prctl() - Check if a prctl op is allowed
3543 * @option: operation
3549 * Check permission before performing a process control operation on the
3552 * Return: Return -ENOSYS if no-one wanted to handle this op, any other value
3553 * to cause prctl() to return immediately with that value.
3555 int security_task_prctl(int option
, unsigned long arg2
, unsigned long arg3
,
3556 unsigned long arg4
, unsigned long arg5
)
3559 int rc
= LSM_RET_DEFAULT(task_prctl
);
3560 struct security_hook_list
*hp
;
3562 hlist_for_each_entry(hp
, &security_hook_heads
.task_prctl
, list
) {
3563 thisrc
= hp
->hook
.task_prctl(option
, arg2
, arg3
, arg4
, arg5
);
3564 if (thisrc
!= LSM_RET_DEFAULT(task_prctl
)) {
3574 * security_task_to_inode() - Set the security attributes of a task's inode
3578 * Set the security attributes for an inode based on an associated task's
3579 * security attributes, e.g. for /proc/pid inodes.
3581 void security_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
3583 call_void_hook(task_to_inode
, p
, inode
);
3587 * security_create_user_ns() - Check if creating a new userns is allowed
3588 * @cred: prepared creds
3590 * Check permission prior to creating a new user namespace.
3592 * Return: Returns 0 if successful, otherwise < 0 error code.
3594 int security_create_user_ns(const struct cred
*cred
)
3596 return call_int_hook(userns_create
, cred
);
3600 * security_ipc_permission() - Check if sysv ipc access is allowed
3601 * @ipcp: ipc permission structure
3602 * @flag: requested permissions
3604 * Check permissions for access to IPC.
3606 * Return: Returns 0 if permission is granted.
3608 int security_ipc_permission(struct kern_ipc_perm
*ipcp
, short flag
)
3610 return call_int_hook(ipc_permission
, ipcp
, flag
);
3614 * security_ipc_getsecid() - Get the sysv ipc object's secid
3615 * @ipcp: ipc permission structure
3616 * @secid: secid pointer
3618 * Get the secid associated with the ipc object. In case of failure, @secid
3619 * will be set to zero.
3621 void security_ipc_getsecid(struct kern_ipc_perm
*ipcp
, u32
*secid
)
3624 call_void_hook(ipc_getsecid
, ipcp
, secid
);
3628 * security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
3629 * @msg: message structure
3631 * Allocate and attach a security structure to the msg->security field. The
3632 * security field is initialized to NULL when the structure is first created.
3634 * Return: Return 0 if operation was successful and permission is granted.
3636 int security_msg_msg_alloc(struct msg_msg
*msg
)
3638 int rc
= lsm_msg_msg_alloc(msg
);
3642 rc
= call_int_hook(msg_msg_alloc_security
, msg
);
3644 security_msg_msg_free(msg
);
3649 * security_msg_msg_free() - Free a sysv ipc message LSM blob
3650 * @msg: message structure
3652 * Deallocate the security structure for this message.
3654 void security_msg_msg_free(struct msg_msg
*msg
)
3656 call_void_hook(msg_msg_free_security
, msg
);
3657 kfree(msg
->security
);
3658 msg
->security
= NULL
;
3662 * security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
3663 * @msq: sysv ipc permission structure
3665 * Allocate and attach a security structure to @msg. The security field is
3666 * initialized to NULL when the structure is first created.
3668 * Return: Returns 0 if operation was successful and permission is granted.
3670 int security_msg_queue_alloc(struct kern_ipc_perm
*msq
)
3672 int rc
= lsm_ipc_alloc(msq
);
3676 rc
= call_int_hook(msg_queue_alloc_security
, msq
);
3678 security_msg_queue_free(msq
);
3683 * security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
3684 * @msq: sysv ipc permission structure
3686 * Deallocate security field @perm->security for the message queue.
3688 void security_msg_queue_free(struct kern_ipc_perm
*msq
)
3690 call_void_hook(msg_queue_free_security
, msq
);
3691 kfree(msq
->security
);
3692 msq
->security
= NULL
;
3696 * security_msg_queue_associate() - Check if a msg queue operation is allowed
3697 * @msq: sysv ipc permission structure
3698 * @msqflg: operation flags
3700 * Check permission when a message queue is requested through the msgget system
3701 * call. This hook is only called when returning the message queue identifier
3702 * for an existing message queue, not when a new message queue is created.
3704 * Return: Return 0 if permission is granted.
3706 int security_msg_queue_associate(struct kern_ipc_perm
*msq
, int msqflg
)
3708 return call_int_hook(msg_queue_associate
, msq
, msqflg
);
3712 * security_msg_queue_msgctl() - Check if a msg queue operation is allowed
3713 * @msq: sysv ipc permission structure
3716 * Check permission when a message control operation specified by @cmd is to be
3717 * performed on the message queue with permissions.
3719 * Return: Returns 0 if permission is granted.
3721 int security_msg_queue_msgctl(struct kern_ipc_perm
*msq
, int cmd
)
3723 return call_int_hook(msg_queue_msgctl
, msq
, cmd
);
3727 * security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
3728 * @msq: sysv ipc permission structure
3730 * @msqflg: operation flags
3732 * Check permission before a message, @msg, is enqueued on the message queue
3733 * with permissions specified in @msq.
3735 * Return: Returns 0 if permission is granted.
3737 int security_msg_queue_msgsnd(struct kern_ipc_perm
*msq
,
3738 struct msg_msg
*msg
, int msqflg
)
3740 return call_int_hook(msg_queue_msgsnd
, msq
, msg
, msqflg
);
3744 * security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
3745 * @msq: sysv ipc permission structure
3747 * @target: target task
3748 * @type: type of message requested
3749 * @mode: operation flags
3751 * Check permission before a message, @msg, is removed from the message queue.
3752 * The @target task structure contains a pointer to the process that will be
3753 * receiving the message (not equal to the current process when inline receives
3754 * are being performed).
3756 * Return: Returns 0 if permission is granted.
3758 int security_msg_queue_msgrcv(struct kern_ipc_perm
*msq
, struct msg_msg
*msg
,
3759 struct task_struct
*target
, long type
, int mode
)
3761 return call_int_hook(msg_queue_msgrcv
, msq
, msg
, target
, type
, mode
);
3765 * security_shm_alloc() - Allocate a sysv shm LSM blob
3766 * @shp: sysv ipc permission structure
3768 * Allocate and attach a security structure to the @shp security field. The
3769 * security field is initialized to NULL when the structure is first created.
3771 * Return: Returns 0 if operation was successful and permission is granted.
3773 int security_shm_alloc(struct kern_ipc_perm
*shp
)
3775 int rc
= lsm_ipc_alloc(shp
);
3779 rc
= call_int_hook(shm_alloc_security
, shp
);
3781 security_shm_free(shp
);
3786 * security_shm_free() - Free a sysv shm LSM blob
3787 * @shp: sysv ipc permission structure
3789 * Deallocate the security structure @perm->security for the memory segment.
3791 void security_shm_free(struct kern_ipc_perm
*shp
)
3793 call_void_hook(shm_free_security
, shp
);
3794 kfree(shp
->security
);
3795 shp
->security
= NULL
;
3799 * security_shm_associate() - Check if a sysv shm operation is allowed
3800 * @shp: sysv ipc permission structure
3801 * @shmflg: operation flags
3803 * Check permission when a shared memory region is requested through the shmget
3804 * system call. This hook is only called when returning the shared memory
3805 * region identifier for an existing region, not when a new shared memory
3806 * region is created.
3808 * Return: Returns 0 if permission is granted.
3810 int security_shm_associate(struct kern_ipc_perm
*shp
, int shmflg
)
3812 return call_int_hook(shm_associate
, shp
, shmflg
);
3816 * security_shm_shmctl() - Check if a sysv shm operation is allowed
3817 * @shp: sysv ipc permission structure
3820 * Check permission when a shared memory control operation specified by @cmd is
3821 * to be performed on the shared memory region with permissions in @shp.
3823 * Return: Return 0 if permission is granted.
3825 int security_shm_shmctl(struct kern_ipc_perm
*shp
, int cmd
)
3827 return call_int_hook(shm_shmctl
, shp
, cmd
);
3831 * security_shm_shmat() - Check if a sysv shm attach operation is allowed
3832 * @shp: sysv ipc permission structure
3833 * @shmaddr: address of memory region to attach
3834 * @shmflg: operation flags
3836 * Check permissions prior to allowing the shmat system call to attach the
3837 * shared memory segment with permissions @shp to the data segment of the
3838 * calling process. The attaching address is specified by @shmaddr.
3840 * Return: Returns 0 if permission is granted.
3842 int security_shm_shmat(struct kern_ipc_perm
*shp
,
3843 char __user
*shmaddr
, int shmflg
)
3845 return call_int_hook(shm_shmat
, shp
, shmaddr
, shmflg
);
3849 * security_sem_alloc() - Allocate a sysv semaphore LSM blob
3850 * @sma: sysv ipc permission structure
3852 * Allocate and attach a security structure to the @sma security field. The
3853 * security field is initialized to NULL when the structure is first created.
3855 * Return: Returns 0 if operation was successful and permission is granted.
3857 int security_sem_alloc(struct kern_ipc_perm
*sma
)
3859 int rc
= lsm_ipc_alloc(sma
);
3863 rc
= call_int_hook(sem_alloc_security
, sma
);
3865 security_sem_free(sma
);
3870 * security_sem_free() - Free a sysv semaphore LSM blob
3871 * @sma: sysv ipc permission structure
3873 * Deallocate security structure @sma->security for the semaphore.
3875 void security_sem_free(struct kern_ipc_perm
*sma
)
3877 call_void_hook(sem_free_security
, sma
);
3878 kfree(sma
->security
);
3879 sma
->security
= NULL
;
3883 * security_sem_associate() - Check if a sysv semaphore operation is allowed
3884 * @sma: sysv ipc permission structure
3885 * @semflg: operation flags
3887 * Check permission when a semaphore is requested through the semget system
3888 * call. This hook is only called when returning the semaphore identifier for
3889 * an existing semaphore, not when a new one must be created.
3891 * Return: Returns 0 if permission is granted.
3893 int security_sem_associate(struct kern_ipc_perm
*sma
, int semflg
)
3895 return call_int_hook(sem_associate
, sma
, semflg
);
3899 * security_sem_semctl() - Check if a sysv semaphore operation is allowed
3900 * @sma: sysv ipc permission structure
3903 * Check permission when a semaphore operation specified by @cmd is to be
3904 * performed on the semaphore.
3906 * Return: Returns 0 if permission is granted.
3908 int security_sem_semctl(struct kern_ipc_perm
*sma
, int cmd
)
3910 return call_int_hook(sem_semctl
, sma
, cmd
);
3914 * security_sem_semop() - Check if a sysv semaphore operation is allowed
3915 * @sma: sysv ipc permission structure
3916 * @sops: operations to perform
3917 * @nsops: number of operations
3918 * @alter: flag indicating changes will be made
3920 * Check permissions before performing operations on members of the semaphore
3921 * set. If the @alter flag is nonzero, the semaphore set may be modified.
3923 * Return: Returns 0 if permission is granted.
3925 int security_sem_semop(struct kern_ipc_perm
*sma
, struct sembuf
*sops
,
3926 unsigned nsops
, int alter
)
3928 return call_int_hook(sem_semop
, sma
, sops
, nsops
, alter
);
3932 * security_d_instantiate() - Populate an inode's LSM state based on a dentry
3936 * Fill in @inode security information for a @dentry if allowed.
3938 void security_d_instantiate(struct dentry
*dentry
, struct inode
*inode
)
3940 if (unlikely(inode
&& IS_PRIVATE(inode
)))
3942 call_void_hook(d_instantiate
, dentry
, inode
);
3944 EXPORT_SYMBOL(security_d_instantiate
);
3947 * Please keep this in sync with it's counterpart in security/lsm_syscalls.c
3951 * security_getselfattr - Read an LSM attribute of the current process.
3952 * @attr: which attribute to return
3953 * @uctx: the user-space destination for the information, or NULL
3954 * @size: pointer to the size of space available to receive the data
3955 * @flags: special handling options. LSM_FLAG_SINGLE indicates that only
3956 * attributes associated with the LSM identified in the passed @ctx be
3959 * A NULL value for @uctx can be used to get both the number of attributes
3960 * and the size of the data.
3962 * Returns the number of attributes found on success, negative value
3963 * on error. @size is reset to the total size of the data.
3964 * If @size is insufficient to contain the data -E2BIG is returned.
3966 int security_getselfattr(unsigned int attr
, struct lsm_ctx __user
*uctx
,
3967 u32 __user
*size
, u32 flags
)
3969 struct security_hook_list
*hp
;
3970 struct lsm_ctx lctx
= { .id
= LSM_ID_UNDEF
, };
3971 u8 __user
*base
= (u8 __user
*)uctx
;
3975 bool toobig
= false;
3976 bool single
= false;
3980 if (attr
== LSM_ATTR_UNDEF
)
3984 if (get_user(left
, size
))
3989 * Only flag supported is LSM_FLAG_SINGLE
3991 if (flags
!= LSM_FLAG_SINGLE
|| !uctx
)
3993 if (copy_from_user(&lctx
, uctx
, sizeof(lctx
)))
3996 * If the LSM ID isn't specified it is an error.
3998 if (lctx
.id
== LSM_ID_UNDEF
)
4004 * In the usual case gather all the data from the LSMs.
4005 * In the single case only get the data from the LSM specified.
4007 hlist_for_each_entry(hp
, &security_hook_heads
.getselfattr
, list
) {
4008 if (single
&& lctx
.id
!= hp
->lsmid
->id
)
4012 uctx
= (struct lsm_ctx __user
*)(base
+ total
);
4013 rc
= hp
->hook
.getselfattr(attr
, uctx
, &entrysize
, flags
);
4014 if (rc
== -EOPNOTSUPP
) {
4032 if (put_user(total
, size
))
4037 return LSM_RET_DEFAULT(getselfattr
);
4042 * Please keep this in sync with it's counterpart in security/lsm_syscalls.c
4046 * security_setselfattr - Set an LSM attribute on the current process.
4047 * @attr: which attribute to set
4048 * @uctx: the user-space source for the information
4049 * @size: the size of the data
4050 * @flags: reserved for future use, must be 0
4052 * Set an LSM attribute for the current process. The LSM, attribute
4053 * and new value are included in @uctx.
4055 * Returns 0 on success, -EINVAL if the input is inconsistent, -EFAULT
4056 * if the user buffer is inaccessible, E2BIG if size is too big, or an
4057 * LSM specific failure.
4059 int security_setselfattr(unsigned int attr
, struct lsm_ctx __user
*uctx
,
4060 u32 size
, u32 flags
)
4062 struct security_hook_list
*hp
;
4063 struct lsm_ctx
*lctx
;
4064 int rc
= LSM_RET_DEFAULT(setselfattr
);
4069 if (size
< sizeof(*lctx
))
4071 if (size
> PAGE_SIZE
)
4074 lctx
= memdup_user(uctx
, size
);
4076 return PTR_ERR(lctx
);
4078 if (size
< lctx
->len
||
4079 check_add_overflow(sizeof(*lctx
), lctx
->ctx_len
, &required_len
) ||
4080 lctx
->len
< required_len
) {
4085 hlist_for_each_entry(hp
, &security_hook_heads
.setselfattr
, list
)
4086 if ((hp
->lsmid
->id
) == lctx
->id
) {
4087 rc
= hp
->hook
.setselfattr(attr
, lctx
, size
, flags
);
4097 * security_getprocattr() - Read an attribute for a task
4099 * @lsmid: LSM identification
4100 * @name: attribute name
4101 * @value: attribute value
4103 * Read attribute @name for task @p and store it into @value if allowed.
4105 * Return: Returns the length of @value on success, a negative value otherwise.
4107 int security_getprocattr(struct task_struct
*p
, int lsmid
, const char *name
,
4110 struct security_hook_list
*hp
;
4112 hlist_for_each_entry(hp
, &security_hook_heads
.getprocattr
, list
) {
4113 if (lsmid
!= 0 && lsmid
!= hp
->lsmid
->id
)
4115 return hp
->hook
.getprocattr(p
, name
, value
);
4117 return LSM_RET_DEFAULT(getprocattr
);
4121 * security_setprocattr() - Set an attribute for a task
4122 * @lsmid: LSM identification
4123 * @name: attribute name
4124 * @value: attribute value
4125 * @size: attribute value size
4127 * Write (set) the current task's attribute @name to @value, size @size if
4130 * Return: Returns bytes written on success, a negative value otherwise.
4132 int security_setprocattr(int lsmid
, const char *name
, void *value
, size_t size
)
4134 struct security_hook_list
*hp
;
4136 hlist_for_each_entry(hp
, &security_hook_heads
.setprocattr
, list
) {
4137 if (lsmid
!= 0 && lsmid
!= hp
->lsmid
->id
)
4139 return hp
->hook
.setprocattr(name
, value
, size
);
4141 return LSM_RET_DEFAULT(setprocattr
);
4145 * security_netlink_send() - Save info and check if netlink sending is allowed
4146 * @sk: sending socket
4147 * @skb: netlink message
4149 * Save security information for a netlink message so that permission checking
4150 * can be performed when the message is processed. The security information
4151 * can be saved using the eff_cap field of the netlink_skb_parms structure.
4152 * Also may be used to provide fine grained control over message transmission.
4154 * Return: Returns 0 if the information was successfully saved and message is
4155 * allowed to be transmitted.
4157 int security_netlink_send(struct sock
*sk
, struct sk_buff
*skb
)
4159 return call_int_hook(netlink_send
, sk
, skb
);
4163 * security_ismaclabel() - Check if the named attribute is a MAC label
4164 * @name: full extended attribute name
4166 * Check if the extended attribute specified by @name represents a MAC label.
4168 * Return: Returns 1 if name is a MAC attribute otherwise returns 0.
4170 int security_ismaclabel(const char *name
)
4172 return call_int_hook(ismaclabel
, name
);
4174 EXPORT_SYMBOL(security_ismaclabel
);
4177 * security_secid_to_secctx() - Convert a secid to a secctx
4180 * @seclen: secctx length
4182 * Convert secid to security context. If @secdata is NULL the length of the
4183 * result will be returned in @seclen, but no @secdata will be returned. This
4184 * does mean that the length could change between calls to check the length and
4185 * the next call which actually allocates and returns the @secdata.
4187 * Return: Return 0 on success, error on failure.
4189 int security_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4191 return call_int_hook(secid_to_secctx
, secid
, secdata
, seclen
);
4193 EXPORT_SYMBOL(security_secid_to_secctx
);
4196 * security_secctx_to_secid() - Convert a secctx to a secid
4198 * @seclen: length of secctx
4201 * Convert security context to secid.
4203 * Return: Returns 0 on success, error on failure.
4205 int security_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4208 return call_int_hook(secctx_to_secid
, secdata
, seclen
, secid
);
4210 EXPORT_SYMBOL(security_secctx_to_secid
);
4213 * security_release_secctx() - Free a secctx buffer
4215 * @seclen: length of secctx
4217 * Release the security context.
4219 void security_release_secctx(char *secdata
, u32 seclen
)
4221 call_void_hook(release_secctx
, secdata
, seclen
);
4223 EXPORT_SYMBOL(security_release_secctx
);
4226 * security_inode_invalidate_secctx() - Invalidate an inode's security label
4229 * Notify the security module that it must revalidate the security context of
4232 void security_inode_invalidate_secctx(struct inode
*inode
)
4234 call_void_hook(inode_invalidate_secctx
, inode
);
4236 EXPORT_SYMBOL(security_inode_invalidate_secctx
);
4239 * security_inode_notifysecctx() - Notify the LSM of an inode's security label
4242 * @ctxlen: length of secctx
4244 * Notify the security module of what the security context of an inode should
4245 * be. Initializes the incore security context managed by the security module
4246 * for this inode. Example usage: NFS client invokes this hook to initialize
4247 * the security context in its incore inode to the value provided by the server
4248 * for the file when the server returned the file's attributes to the client.
4249 * Must be called with inode->i_mutex locked.
4251 * Return: Returns 0 on success, error on failure.
4253 int security_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4255 return call_int_hook(inode_notifysecctx
, inode
, ctx
, ctxlen
);
4257 EXPORT_SYMBOL(security_inode_notifysecctx
);
4260 * security_inode_setsecctx() - Change the security label of an inode
4263 * @ctxlen: length of secctx
4265 * Change the security context of an inode. Updates the incore security
4266 * context managed by the security module and invokes the fs code as needed
4267 * (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
4268 * context. Example usage: NFS server invokes this hook to change the security
4269 * context in its incore inode and on the backing filesystem to a value
4270 * provided by the client on a SETATTR operation. Must be called with
4271 * inode->i_mutex locked.
4273 * Return: Returns 0 on success, error on failure.
4275 int security_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4277 return call_int_hook(inode_setsecctx
, dentry
, ctx
, ctxlen
);
4279 EXPORT_SYMBOL(security_inode_setsecctx
);
4282 * security_inode_getsecctx() - Get the security label of an inode
4285 * @ctxlen: length of secctx
4287 * On success, returns 0 and fills out @ctx and @ctxlen with the security
4288 * context for the given @inode.
4290 * Return: Returns 0 on success, error on failure.
4292 int security_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4294 return call_int_hook(inode_getsecctx
, inode
, ctx
, ctxlen
);
4296 EXPORT_SYMBOL(security_inode_getsecctx
);
4298 #ifdef CONFIG_WATCH_QUEUE
4300 * security_post_notification() - Check if a watch notification can be posted
4301 * @w_cred: credentials of the task that set the watch
4302 * @cred: credentials of the task which triggered the watch
4303 * @n: the notification
4305 * Check to see if a watch notification can be posted to a particular queue.
4307 * Return: Returns 0 if permission is granted.
4309 int security_post_notification(const struct cred
*w_cred
,
4310 const struct cred
*cred
,
4311 struct watch_notification
*n
)
4313 return call_int_hook(post_notification
, w_cred
, cred
, n
);
4315 #endif /* CONFIG_WATCH_QUEUE */
4317 #ifdef CONFIG_KEY_NOTIFICATIONS
4319 * security_watch_key() - Check if a task is allowed to watch for key events
4320 * @key: the key to watch
4322 * Check to see if a process is allowed to watch for event notifications from
4325 * Return: Returns 0 if permission is granted.
4327 int security_watch_key(struct key
*key
)
4329 return call_int_hook(watch_key
, key
);
4331 #endif /* CONFIG_KEY_NOTIFICATIONS */
4333 #ifdef CONFIG_SECURITY_NETWORK
4335 * security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
4336 * @sock: originating sock
4340 * Check permissions before establishing a Unix domain stream connection
4341 * between @sock and @other.
4343 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4344 * Linux provides an alternative to the conventional file name space for Unix
4345 * domain sockets. Whereas binding and connecting to sockets in the file name
4346 * space is mediated by the typical file permissions (and caught by the mknod
4347 * and permission hooks in inode_security_ops), binding and connecting to
4348 * sockets in the abstract name space is completely unmediated. Sufficient
4349 * control of Unix domain sockets in the abstract name space isn't possible
4350 * using only the socket layer hooks, since we need to know the actual target
4351 * socket, which is not looked up until we are inside the af_unix code.
4353 * Return: Returns 0 if permission is granted.
4355 int security_unix_stream_connect(struct sock
*sock
, struct sock
*other
,
4358 return call_int_hook(unix_stream_connect
, sock
, other
, newsk
);
4360 EXPORT_SYMBOL(security_unix_stream_connect
);
4363 * security_unix_may_send() - Check if AF_UNIX socket can send datagrams
4364 * @sock: originating sock
4367 * Check permissions before connecting or sending datagrams from @sock to
4370 * The @unix_stream_connect and @unix_may_send hooks were necessary because
4371 * Linux provides an alternative to the conventional file name space for Unix
4372 * domain sockets. Whereas binding and connecting to sockets in the file name
4373 * space is mediated by the typical file permissions (and caught by the mknod
4374 * and permission hooks in inode_security_ops), binding and connecting to
4375 * sockets in the abstract name space is completely unmediated. Sufficient
4376 * control of Unix domain sockets in the abstract name space isn't possible
4377 * using only the socket layer hooks, since we need to know the actual target
4378 * socket, which is not looked up until we are inside the af_unix code.
4380 * Return: Returns 0 if permission is granted.
4382 int security_unix_may_send(struct socket
*sock
, struct socket
*other
)
4384 return call_int_hook(unix_may_send
, sock
, other
);
4386 EXPORT_SYMBOL(security_unix_may_send
);
4389 * security_socket_create() - Check if creating a new socket is allowed
4390 * @family: protocol family
4391 * @type: communications type
4392 * @protocol: requested protocol
4393 * @kern: set to 1 if a kernel socket is requested
4395 * Check permissions prior to creating a new socket.
4397 * Return: Returns 0 if permission is granted.
4399 int security_socket_create(int family
, int type
, int protocol
, int kern
)
4401 return call_int_hook(socket_create
, family
, type
, protocol
, kern
);
4405 * security_socket_post_create() - Initialize a newly created socket
4407 * @family: protocol family
4408 * @type: communications type
4409 * @protocol: requested protocol
4410 * @kern: set to 1 if a kernel socket is requested
4412 * This hook allows a module to update or allocate a per-socket security
4413 * structure. Note that the security field was not added directly to the socket
4414 * structure, but rather, the socket security information is stored in the
4415 * associated inode. Typically, the inode alloc_security hook will allocate
4416 * and attach security information to SOCK_INODE(sock)->i_security. This hook
4417 * may be used to update the SOCK_INODE(sock)->i_security field with additional
4418 * information that wasn't available when the inode was allocated.
4420 * Return: Returns 0 if permission is granted.
4422 int security_socket_post_create(struct socket
*sock
, int family
,
4423 int type
, int protocol
, int kern
)
4425 return call_int_hook(socket_post_create
, sock
, family
, type
,
4430 * security_socket_socketpair() - Check if creating a socketpair is allowed
4431 * @socka: first socket
4432 * @sockb: second socket
4434 * Check permissions before creating a fresh pair of sockets.
4436 * Return: Returns 0 if permission is granted and the connection was
4439 int security_socket_socketpair(struct socket
*socka
, struct socket
*sockb
)
4441 return call_int_hook(socket_socketpair
, socka
, sockb
);
4443 EXPORT_SYMBOL(security_socket_socketpair
);
4446 * security_socket_bind() - Check if a socket bind operation is allowed
4448 * @address: requested bind address
4449 * @addrlen: length of address
4451 * Check permission before socket protocol layer bind operation is performed
4452 * and the socket @sock is bound to the address specified in the @address
4455 * Return: Returns 0 if permission is granted.
4457 int security_socket_bind(struct socket
*sock
,
4458 struct sockaddr
*address
, int addrlen
)
4460 return call_int_hook(socket_bind
, sock
, address
, addrlen
);
4464 * security_socket_connect() - Check if a socket connect operation is allowed
4466 * @address: address of remote connection point
4467 * @addrlen: length of address
4469 * Check permission before socket protocol layer connect operation attempts to
4470 * connect socket @sock to a remote address, @address.
4472 * Return: Returns 0 if permission is granted.
4474 int security_socket_connect(struct socket
*sock
,
4475 struct sockaddr
*address
, int addrlen
)
4477 return call_int_hook(socket_connect
, sock
, address
, addrlen
);
4481 * security_socket_listen() - Check if a socket is allowed to listen
4483 * @backlog: connection queue size
4485 * Check permission before socket protocol layer listen operation.
4487 * Return: Returns 0 if permission is granted.
4489 int security_socket_listen(struct socket
*sock
, int backlog
)
4491 return call_int_hook(socket_listen
, sock
, backlog
);
4495 * security_socket_accept() - Check if a socket is allowed to accept connections
4496 * @sock: listening socket
4497 * @newsock: newly creation connection socket
4499 * Check permission before accepting a new connection. Note that the new
4500 * socket, @newsock, has been created and some information copied to it, but
4501 * the accept operation has not actually been performed.
4503 * Return: Returns 0 if permission is granted.
4505 int security_socket_accept(struct socket
*sock
, struct socket
*newsock
)
4507 return call_int_hook(socket_accept
, sock
, newsock
);
4511 * security_socket_sendmsg() - Check if sending a message is allowed
4512 * @sock: sending socket
4513 * @msg: message to send
4514 * @size: size of message
4516 * Check permission before transmitting a message to another socket.
4518 * Return: Returns 0 if permission is granted.
4520 int security_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
, int size
)
4522 return call_int_hook(socket_sendmsg
, sock
, msg
, size
);
4526 * security_socket_recvmsg() - Check if receiving a message is allowed
4527 * @sock: receiving socket
4528 * @msg: message to receive
4529 * @size: size of message
4530 * @flags: operational flags
4532 * Check permission before receiving a message from a socket.
4534 * Return: Returns 0 if permission is granted.
4536 int security_socket_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
4537 int size
, int flags
)
4539 return call_int_hook(socket_recvmsg
, sock
, msg
, size
, flags
);
4543 * security_socket_getsockname() - Check if reading the socket addr is allowed
4546 * Check permission before reading the local address (name) of the socket
4549 * Return: Returns 0 if permission is granted.
4551 int security_socket_getsockname(struct socket
*sock
)
4553 return call_int_hook(socket_getsockname
, sock
);
4557 * security_socket_getpeername() - Check if reading the peer's addr is allowed
4560 * Check permission before the remote address (name) of a socket object.
4562 * Return: Returns 0 if permission is granted.
4564 int security_socket_getpeername(struct socket
*sock
)
4566 return call_int_hook(socket_getpeername
, sock
);
4570 * security_socket_getsockopt() - Check if reading a socket option is allowed
4572 * @level: option's protocol level
4573 * @optname: option name
4575 * Check permissions before retrieving the options associated with socket
4578 * Return: Returns 0 if permission is granted.
4580 int security_socket_getsockopt(struct socket
*sock
, int level
, int optname
)
4582 return call_int_hook(socket_getsockopt
, sock
, level
, optname
);
4586 * security_socket_setsockopt() - Check if setting a socket option is allowed
4588 * @level: option's protocol level
4589 * @optname: option name
4591 * Check permissions before setting the options associated with socket @sock.
4593 * Return: Returns 0 if permission is granted.
4595 int security_socket_setsockopt(struct socket
*sock
, int level
, int optname
)
4597 return call_int_hook(socket_setsockopt
, sock
, level
, optname
);
4601 * security_socket_shutdown() - Checks if shutting down the socket is allowed
4603 * @how: flag indicating how sends and receives are handled
4605 * Checks permission before all or part of a connection on the socket @sock is
4608 * Return: Returns 0 if permission is granted.
4610 int security_socket_shutdown(struct socket
*sock
, int how
)
4612 return call_int_hook(socket_shutdown
, sock
, how
);
4616 * security_sock_rcv_skb() - Check if an incoming network packet is allowed
4617 * @sk: destination sock
4618 * @skb: incoming packet
4620 * Check permissions on incoming network packets. This hook is distinct from
4621 * Netfilter's IP input hooks since it is the first time that the incoming
4622 * sk_buff @skb has been associated with a particular socket, @sk. Must not
4623 * sleep inside this hook because some callers hold spinlocks.
4625 * Return: Returns 0 if permission is granted.
4627 int security_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
4629 return call_int_hook(socket_sock_rcv_skb
, sk
, skb
);
4631 EXPORT_SYMBOL(security_sock_rcv_skb
);
4634 * security_socket_getpeersec_stream() - Get the remote peer label
4636 * @optval: destination buffer
4637 * @optlen: size of peer label copied into the buffer
4638 * @len: maximum size of the destination buffer
4640 * This hook allows the security module to provide peer socket security state
4641 * for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
4642 * For tcp sockets this can be meaningful if the socket is associated with an
4645 * Return: Returns 0 if all is well, otherwise, typical getsockopt return
4648 int security_socket_getpeersec_stream(struct socket
*sock
, sockptr_t optval
,
4649 sockptr_t optlen
, unsigned int len
)
4651 return call_int_hook(socket_getpeersec_stream
, sock
, optval
, optlen
,
4656 * security_socket_getpeersec_dgram() - Get the remote peer label
4658 * @skb: datagram packet
4659 * @secid: remote peer label secid
4661 * This hook allows the security module to provide peer socket security state
4662 * for udp sockets on a per-packet basis to userspace via getsockopt
4663 * SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
4664 * option via getsockopt. It can then retrieve the security state returned by
4665 * this hook for a packet via the SCM_SECURITY ancillary message type.
4667 * Return: Returns 0 on success, error on failure.
4669 int security_socket_getpeersec_dgram(struct socket
*sock
,
4670 struct sk_buff
*skb
, u32
*secid
)
4672 return call_int_hook(socket_getpeersec_dgram
, sock
, skb
, secid
);
4674 EXPORT_SYMBOL(security_socket_getpeersec_dgram
);
4677 * security_sk_alloc() - Allocate and initialize a sock's LSM blob
4679 * @family: protocol family
4680 * @priority: gfp flags
4682 * Allocate and attach a security structure to the sk->sk_security field, which
4683 * is used to copy security attributes between local stream sockets.
4685 * Return: Returns 0 on success, error on failure.
4687 int security_sk_alloc(struct sock
*sk
, int family
, gfp_t priority
)
4689 return call_int_hook(sk_alloc_security
, sk
, family
, priority
);
4693 * security_sk_free() - Free the sock's LSM blob
4696 * Deallocate security structure.
4698 void security_sk_free(struct sock
*sk
)
4700 call_void_hook(sk_free_security
, sk
);
4704 * security_sk_clone() - Clone a sock's LSM state
4705 * @sk: original sock
4706 * @newsk: target sock
4708 * Clone/copy security structure.
4710 void security_sk_clone(const struct sock
*sk
, struct sock
*newsk
)
4712 call_void_hook(sk_clone_security
, sk
, newsk
);
4714 EXPORT_SYMBOL(security_sk_clone
);
4717 * security_sk_classify_flow() - Set a flow's secid based on socket
4718 * @sk: original socket
4719 * @flic: target flow
4721 * Set the target flow's secid to socket's secid.
4723 void security_sk_classify_flow(const struct sock
*sk
, struct flowi_common
*flic
)
4725 call_void_hook(sk_getsecid
, sk
, &flic
->flowic_secid
);
4727 EXPORT_SYMBOL(security_sk_classify_flow
);
4730 * security_req_classify_flow() - Set a flow's secid based on request_sock
4731 * @req: request_sock
4732 * @flic: target flow
4734 * Sets @flic's secid to @req's secid.
4736 void security_req_classify_flow(const struct request_sock
*req
,
4737 struct flowi_common
*flic
)
4739 call_void_hook(req_classify_flow
, req
, flic
);
4741 EXPORT_SYMBOL(security_req_classify_flow
);
4744 * security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
4745 * @sk: sock being grafted
4746 * @parent: target parent socket
4748 * Sets @parent's inode secid to @sk's secid and update @sk with any necessary
4749 * LSM state from @parent.
4751 void security_sock_graft(struct sock
*sk
, struct socket
*parent
)
4753 call_void_hook(sock_graft
, sk
, parent
);
4755 EXPORT_SYMBOL(security_sock_graft
);
4758 * security_inet_conn_request() - Set request_sock state using incoming connect
4759 * @sk: parent listening sock
4760 * @skb: incoming connection
4761 * @req: new request_sock
4763 * Initialize the @req LSM state based on @sk and the incoming connect in @skb.
4765 * Return: Returns 0 if permission is granted.
4767 int security_inet_conn_request(const struct sock
*sk
,
4768 struct sk_buff
*skb
, struct request_sock
*req
)
4770 return call_int_hook(inet_conn_request
, sk
, skb
, req
);
4772 EXPORT_SYMBOL(security_inet_conn_request
);
4775 * security_inet_csk_clone() - Set new sock LSM state based on request_sock
4777 * @req: connection request_sock
4779 * Set that LSM state of @sock using the LSM state from @req.
4781 void security_inet_csk_clone(struct sock
*newsk
,
4782 const struct request_sock
*req
)
4784 call_void_hook(inet_csk_clone
, newsk
, req
);
4788 * security_inet_conn_established() - Update sock's LSM state with connection
4790 * @skb: connection packet
4792 * Update @sock's LSM state to represent a new connection from @skb.
4794 void security_inet_conn_established(struct sock
*sk
,
4795 struct sk_buff
*skb
)
4797 call_void_hook(inet_conn_established
, sk
, skb
);
4799 EXPORT_SYMBOL(security_inet_conn_established
);
4802 * security_secmark_relabel_packet() - Check if setting a secmark is allowed
4803 * @secid: new secmark value
4805 * Check if the process should be allowed to relabel packets to @secid.
4807 * Return: Returns 0 if permission is granted.
4809 int security_secmark_relabel_packet(u32 secid
)
4811 return call_int_hook(secmark_relabel_packet
, secid
);
4813 EXPORT_SYMBOL(security_secmark_relabel_packet
);
4816 * security_secmark_refcount_inc() - Increment the secmark labeling rule count
4818 * Tells the LSM to increment the number of secmark labeling rules loaded.
4820 void security_secmark_refcount_inc(void)
4822 call_void_hook(secmark_refcount_inc
);
4824 EXPORT_SYMBOL(security_secmark_refcount_inc
);
4827 * security_secmark_refcount_dec() - Decrement the secmark labeling rule count
4829 * Tells the LSM to decrement the number of secmark labeling rules loaded.
4831 void security_secmark_refcount_dec(void)
4833 call_void_hook(secmark_refcount_dec
);
4835 EXPORT_SYMBOL(security_secmark_refcount_dec
);
4838 * security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
4839 * @security: pointer to the LSM blob
4841 * This hook allows a module to allocate a security structure for a TUN device,
4842 * returning the pointer in @security.
4844 * Return: Returns a zero on success, negative values on failure.
4846 int security_tun_dev_alloc_security(void **security
)
4848 return call_int_hook(tun_dev_alloc_security
, security
);
4850 EXPORT_SYMBOL(security_tun_dev_alloc_security
);
4853 * security_tun_dev_free_security() - Free a TUN device LSM blob
4854 * @security: LSM blob
4856 * This hook allows a module to free the security structure for a TUN device.
4858 void security_tun_dev_free_security(void *security
)
4860 call_void_hook(tun_dev_free_security
, security
);
4862 EXPORT_SYMBOL(security_tun_dev_free_security
);
4865 * security_tun_dev_create() - Check if creating a TUN device is allowed
4867 * Check permissions prior to creating a new TUN device.
4869 * Return: Returns 0 if permission is granted.
4871 int security_tun_dev_create(void)
4873 return call_int_hook(tun_dev_create
);
4875 EXPORT_SYMBOL(security_tun_dev_create
);
4878 * security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
4879 * @security: TUN device LSM blob
4881 * Check permissions prior to attaching to a TUN device queue.
4883 * Return: Returns 0 if permission is granted.
4885 int security_tun_dev_attach_queue(void *security
)
4887 return call_int_hook(tun_dev_attach_queue
, security
);
4889 EXPORT_SYMBOL(security_tun_dev_attach_queue
);
4892 * security_tun_dev_attach() - Update TUN device LSM state on attach
4893 * @sk: associated sock
4894 * @security: TUN device LSM blob
4896 * This hook can be used by the module to update any security state associated
4897 * with the TUN device's sock structure.
4899 * Return: Returns 0 if permission is granted.
4901 int security_tun_dev_attach(struct sock
*sk
, void *security
)
4903 return call_int_hook(tun_dev_attach
, sk
, security
);
4905 EXPORT_SYMBOL(security_tun_dev_attach
);
4908 * security_tun_dev_open() - Update TUN device LSM state on open
4909 * @security: TUN device LSM blob
4911 * This hook can be used by the module to update any security state associated
4912 * with the TUN device's security structure.
4914 * Return: Returns 0 if permission is granted.
4916 int security_tun_dev_open(void *security
)
4918 return call_int_hook(tun_dev_open
, security
);
4920 EXPORT_SYMBOL(security_tun_dev_open
);
4923 * security_sctp_assoc_request() - Update the LSM on a SCTP association req
4924 * @asoc: SCTP association
4925 * @skb: packet requesting the association
4927 * Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
4929 * Return: Returns 0 on success, error on failure.
4931 int security_sctp_assoc_request(struct sctp_association
*asoc
,
4932 struct sk_buff
*skb
)
4934 return call_int_hook(sctp_assoc_request
, asoc
, skb
);
4936 EXPORT_SYMBOL(security_sctp_assoc_request
);
4939 * security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
4941 * @optname: SCTP option to validate
4942 * @address: list of IP addresses to validate
4943 * @addrlen: length of the address list
4945 * Validiate permissions required for each address associated with sock @sk.
4946 * Depending on @optname, the addresses will be treated as either a connect or
4947 * bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
4948 * sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
4950 * Return: Returns 0 on success, error on failure.
4952 int security_sctp_bind_connect(struct sock
*sk
, int optname
,
4953 struct sockaddr
*address
, int addrlen
)
4955 return call_int_hook(sctp_bind_connect
, sk
, optname
, address
, addrlen
);
4957 EXPORT_SYMBOL(security_sctp_bind_connect
);
4960 * security_sctp_sk_clone() - Clone a SCTP sock's LSM state
4961 * @asoc: SCTP association
4962 * @sk: original sock
4963 * @newsk: target sock
4965 * Called whenever a new socket is created by accept(2) (i.e. a TCP style
4966 * socket) or when a socket is 'peeled off' e.g userspace calls
4969 void security_sctp_sk_clone(struct sctp_association
*asoc
, struct sock
*sk
,
4972 call_void_hook(sctp_sk_clone
, asoc
, sk
, newsk
);
4974 EXPORT_SYMBOL(security_sctp_sk_clone
);
4977 * security_sctp_assoc_established() - Update LSM state when assoc established
4978 * @asoc: SCTP association
4979 * @skb: packet establishing the association
4981 * Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
4984 * Return: Returns 0 if permission is granted.
4986 int security_sctp_assoc_established(struct sctp_association
*asoc
,
4987 struct sk_buff
*skb
)
4989 return call_int_hook(sctp_assoc_established
, asoc
, skb
);
4991 EXPORT_SYMBOL(security_sctp_assoc_established
);
4994 * security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
4995 * @sk: the owning MPTCP socket
4996 * @ssk: the new subflow
4998 * Update the labeling for the given MPTCP subflow, to match the one of the
4999 * owning MPTCP socket. This hook has to be called after the socket creation and
5000 * initialization via the security_socket_create() and
5001 * security_socket_post_create() LSM hooks.
5003 * Return: Returns 0 on success or a negative error code on failure.
5005 int security_mptcp_add_subflow(struct sock
*sk
, struct sock
*ssk
)
5007 return call_int_hook(mptcp_add_subflow
, sk
, ssk
);
5010 #endif /* CONFIG_SECURITY_NETWORK */
5012 #ifdef CONFIG_SECURITY_INFINIBAND
5014 * security_ib_pkey_access() - Check if access to an IB pkey is allowed
5016 * @subnet_prefix: subnet prefix of the port
5019 * Check permission to access a pkey when modifying a QP.
5021 * Return: Returns 0 if permission is granted.
5023 int security_ib_pkey_access(void *sec
, u64 subnet_prefix
, u16 pkey
)
5025 return call_int_hook(ib_pkey_access
, sec
, subnet_prefix
, pkey
);
5027 EXPORT_SYMBOL(security_ib_pkey_access
);
5030 * security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
5032 * @dev_name: IB device name
5033 * @port_num: port number
5035 * Check permissions to send and receive SMPs on a end port.
5037 * Return: Returns 0 if permission is granted.
5039 int security_ib_endport_manage_subnet(void *sec
,
5040 const char *dev_name
, u8 port_num
)
5042 return call_int_hook(ib_endport_manage_subnet
, sec
, dev_name
, port_num
);
5044 EXPORT_SYMBOL(security_ib_endport_manage_subnet
);
5047 * security_ib_alloc_security() - Allocate an Infiniband LSM blob
5050 * Allocate a security structure for Infiniband objects.
5052 * Return: Returns 0 on success, non-zero on failure.
5054 int security_ib_alloc_security(void **sec
)
5056 return call_int_hook(ib_alloc_security
, sec
);
5058 EXPORT_SYMBOL(security_ib_alloc_security
);
5061 * security_ib_free_security() - Free an Infiniband LSM blob
5064 * Deallocate an Infiniband security structure.
5066 void security_ib_free_security(void *sec
)
5068 call_void_hook(ib_free_security
, sec
);
5070 EXPORT_SYMBOL(security_ib_free_security
);
5071 #endif /* CONFIG_SECURITY_INFINIBAND */
5073 #ifdef CONFIG_SECURITY_NETWORK_XFRM
5075 * security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
5076 * @ctxp: xfrm security context being added to the SPD
5077 * @sec_ctx: security label provided by userspace
5080 * Allocate a security structure to the xp->security field; the security field
5081 * is initialized to NULL when the xfrm_policy is allocated.
5083 * Return: Return 0 if operation was successful.
5085 int security_xfrm_policy_alloc(struct xfrm_sec_ctx
**ctxp
,
5086 struct xfrm_user_sec_ctx
*sec_ctx
,
5089 return call_int_hook(xfrm_policy_alloc_security
, ctxp
, sec_ctx
, gfp
);
5091 EXPORT_SYMBOL(security_xfrm_policy_alloc
);
5094 * security_xfrm_policy_clone() - Clone xfrm policy LSM state
5095 * @old_ctx: xfrm security context
5096 * @new_ctxp: target xfrm security context
5098 * Allocate a security structure in new_ctxp that contains the information from
5099 * the old_ctx structure.
5101 * Return: Return 0 if operation was successful.
5103 int security_xfrm_policy_clone(struct xfrm_sec_ctx
*old_ctx
,
5104 struct xfrm_sec_ctx
**new_ctxp
)
5106 return call_int_hook(xfrm_policy_clone_security
, old_ctx
, new_ctxp
);
5110 * security_xfrm_policy_free() - Free a xfrm security context
5111 * @ctx: xfrm security context
5113 * Free LSM resources associated with @ctx.
5115 void security_xfrm_policy_free(struct xfrm_sec_ctx
*ctx
)
5117 call_void_hook(xfrm_policy_free_security
, ctx
);
5119 EXPORT_SYMBOL(security_xfrm_policy_free
);
5122 * security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
5123 * @ctx: xfrm security context
5125 * Authorize deletion of a SPD entry.
5127 * Return: Returns 0 if permission is granted.
5129 int security_xfrm_policy_delete(struct xfrm_sec_ctx
*ctx
)
5131 return call_int_hook(xfrm_policy_delete_security
, ctx
);
5135 * security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
5136 * @x: xfrm state being added to the SAD
5137 * @sec_ctx: security label provided by userspace
5139 * Allocate a security structure to the @x->security field; the security field
5140 * is initialized to NULL when the xfrm_state is allocated. Set the context to
5141 * correspond to @sec_ctx.
5143 * Return: Return 0 if operation was successful.
5145 int security_xfrm_state_alloc(struct xfrm_state
*x
,
5146 struct xfrm_user_sec_ctx
*sec_ctx
)
5148 return call_int_hook(xfrm_state_alloc
, x
, sec_ctx
);
5150 EXPORT_SYMBOL(security_xfrm_state_alloc
);
5153 * security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
5154 * @x: xfrm state being added to the SAD
5155 * @polsec: associated policy's security context
5156 * @secid: secid from the flow
5158 * Allocate a security structure to the x->security field; the security field
5159 * is initialized to NULL when the xfrm_state is allocated. Set the context to
5160 * correspond to secid.
5162 * Return: Returns 0 if operation was successful.
5164 int security_xfrm_state_alloc_acquire(struct xfrm_state
*x
,
5165 struct xfrm_sec_ctx
*polsec
, u32 secid
)
5167 return call_int_hook(xfrm_state_alloc_acquire
, x
, polsec
, secid
);
5171 * security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
5174 * Authorize deletion of x->security.
5176 * Return: Returns 0 if permission is granted.
5178 int security_xfrm_state_delete(struct xfrm_state
*x
)
5180 return call_int_hook(xfrm_state_delete_security
, x
);
5182 EXPORT_SYMBOL(security_xfrm_state_delete
);
5185 * security_xfrm_state_free() - Free a xfrm state
5188 * Deallocate x->security.
5190 void security_xfrm_state_free(struct xfrm_state
*x
)
5192 call_void_hook(xfrm_state_free_security
, x
);
5196 * security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
5197 * @ctx: target xfrm security context
5198 * @fl_secid: flow secid used to authorize access
5200 * Check permission when a flow selects a xfrm_policy for processing XFRMs on a
5201 * packet. The hook is called when selecting either a per-socket policy or a
5202 * generic xfrm policy.
5204 * Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
5207 int security_xfrm_policy_lookup(struct xfrm_sec_ctx
*ctx
, u32 fl_secid
)
5209 return call_int_hook(xfrm_policy_lookup
, ctx
, fl_secid
);
5213 * security_xfrm_state_pol_flow_match() - Check for a xfrm match
5214 * @x: xfrm state to match
5215 * @xp: xfrm policy to check for a match
5216 * @flic: flow to check for a match.
5218 * Check @xp and @flic for a match with @x.
5220 * Return: Returns 1 if there is a match.
5222 int security_xfrm_state_pol_flow_match(struct xfrm_state
*x
,
5223 struct xfrm_policy
*xp
,
5224 const struct flowi_common
*flic
)
5226 struct security_hook_list
*hp
;
5227 int rc
= LSM_RET_DEFAULT(xfrm_state_pol_flow_match
);
5230 * Since this function is expected to return 0 or 1, the judgment
5231 * becomes difficult if multiple LSMs supply this call. Fortunately,
5232 * we can use the first LSM's judgment because currently only SELinux
5233 * supplies this call.
5235 * For speed optimization, we explicitly break the loop rather than
5238 hlist_for_each_entry(hp
, &security_hook_heads
.xfrm_state_pol_flow_match
,
5240 rc
= hp
->hook
.xfrm_state_pol_flow_match(x
, xp
, flic
);
5247 * security_xfrm_decode_session() - Determine the xfrm secid for a packet
5251 * Decode the packet in @skb and return the security label in @secid.
5253 * Return: Return 0 if all xfrms used have the same secid.
5255 int security_xfrm_decode_session(struct sk_buff
*skb
, u32
*secid
)
5257 return call_int_hook(xfrm_decode_session
, skb
, secid
, 1);
5260 void security_skb_classify_flow(struct sk_buff
*skb
, struct flowi_common
*flic
)
5262 int rc
= call_int_hook(xfrm_decode_session
, skb
, &flic
->flowic_secid
,
5267 EXPORT_SYMBOL(security_skb_classify_flow
);
5268 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
5272 * security_key_alloc() - Allocate and initialize a kernel key LSM blob
5274 * @cred: credentials
5275 * @flags: allocation flags
5277 * Permit allocation of a key and assign security data. Note that key does not
5278 * have a serial number assigned at this point.
5280 * Return: Return 0 if permission is granted, -ve error otherwise.
5282 int security_key_alloc(struct key
*key
, const struct cred
*cred
,
5283 unsigned long flags
)
5285 return call_int_hook(key_alloc
, key
, cred
, flags
);
5289 * security_key_free() - Free a kernel key LSM blob
5292 * Notification of destruction; free security data.
5294 void security_key_free(struct key
*key
)
5296 call_void_hook(key_free
, key
);
5300 * security_key_permission() - Check if a kernel key operation is allowed
5301 * @key_ref: key reference
5302 * @cred: credentials of actor requesting access
5303 * @need_perm: requested permissions
5305 * See whether a specific operational right is granted to a process on a key.
5307 * Return: Return 0 if permission is granted, -ve error otherwise.
5309 int security_key_permission(key_ref_t key_ref
, const struct cred
*cred
,
5310 enum key_need_perm need_perm
)
5312 return call_int_hook(key_permission
, key_ref
, cred
, need_perm
);
5316 * security_key_getsecurity() - Get the key's security label
5318 * @buffer: security label buffer
5320 * Get a textual representation of the security context attached to a key for
5321 * the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
5322 * storage for the NUL-terminated string and the caller should free it.
5324 * Return: Returns the length of @buffer (including terminating NUL) or -ve if
5325 * an error occurs. May also return 0 (and a NULL buffer pointer) if
5326 * there is no security label assigned to the key.
5328 int security_key_getsecurity(struct key
*key
, char **buffer
)
5331 return call_int_hook(key_getsecurity
, key
, buffer
);
5335 * security_key_post_create_or_update() - Notification of key create or update
5336 * @keyring: keyring to which the key is linked to
5337 * @key: created or updated key
5338 * @payload: data used to instantiate or update the key
5339 * @payload_len: length of payload
5341 * @create: flag indicating whether the key was created or updated
5343 * Notify the caller of a key creation or update.
5345 void security_key_post_create_or_update(struct key
*keyring
, struct key
*key
,
5346 const void *payload
, size_t payload_len
,
5347 unsigned long flags
, bool create
)
5349 call_void_hook(key_post_create_or_update
, keyring
, key
, payload
,
5350 payload_len
, flags
, create
);
5352 #endif /* CONFIG_KEYS */
5356 * security_audit_rule_init() - Allocate and init an LSM audit rule struct
5357 * @field: audit action
5358 * @op: rule operator
5359 * @rulestr: rule context
5360 * @lsmrule: receive buffer for audit rule struct
5361 * @gfp: GFP flag used for kmalloc
5363 * Allocate and initialize an LSM audit rule structure.
5365 * Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
5368 int security_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **lsmrule
,
5371 return call_int_hook(audit_rule_init
, field
, op
, rulestr
, lsmrule
, gfp
);
5375 * security_audit_rule_known() - Check if an audit rule contains LSM fields
5376 * @krule: audit rule
5378 * Specifies whether given @krule contains any fields related to the current
5381 * Return: Returns 1 in case of relation found, 0 otherwise.
5383 int security_audit_rule_known(struct audit_krule
*krule
)
5385 return call_int_hook(audit_rule_known
, krule
);
5389 * security_audit_rule_free() - Free an LSM audit rule struct
5390 * @lsmrule: audit rule struct
5392 * Deallocate the LSM audit rule structure previously allocated by
5393 * audit_rule_init().
5395 void security_audit_rule_free(void *lsmrule
)
5397 call_void_hook(audit_rule_free
, lsmrule
);
5401 * security_audit_rule_match() - Check if a label matches an audit rule
5402 * @secid: security label
5403 * @field: LSM audit field
5404 * @op: matching operator
5405 * @lsmrule: audit rule
5407 * Determine if given @secid matches a rule previously approved by
5408 * security_audit_rule_known().
5410 * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
5413 int security_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *lsmrule
)
5415 return call_int_hook(audit_rule_match
, secid
, field
, op
, lsmrule
);
5417 #endif /* CONFIG_AUDIT */
5419 #ifdef CONFIG_BPF_SYSCALL
5421 * security_bpf() - Check if the bpf syscall operation is allowed
5423 * @attr: bpf attribute
5426 * Do a initial check for all bpf syscalls after the attribute is copied into
5427 * the kernel. The actual security module can implement their own rules to
5428 * check the specific cmd they need.
5430 * Return: Returns 0 if permission is granted.
5432 int security_bpf(int cmd
, union bpf_attr
*attr
, unsigned int size
)
5434 return call_int_hook(bpf
, cmd
, attr
, size
);
5438 * security_bpf_map() - Check if access to a bpf map is allowed
5442 * Do a check when the kernel generates and returns a file descriptor for eBPF
5445 * Return: Returns 0 if permission is granted.
5447 int security_bpf_map(struct bpf_map
*map
, fmode_t fmode
)
5449 return call_int_hook(bpf_map
, map
, fmode
);
5453 * security_bpf_prog() - Check if access to a bpf program is allowed
5454 * @prog: bpf program
5456 * Do a check when the kernel generates and returns a file descriptor for eBPF
5459 * Return: Returns 0 if permission is granted.
5461 int security_bpf_prog(struct bpf_prog
*prog
)
5463 return call_int_hook(bpf_prog
, prog
);
5467 * security_bpf_map_create() - Check if BPF map creation is allowed
5468 * @map: BPF map object
5469 * @attr: BPF syscall attributes used to create BPF map
5470 * @token: BPF token used to grant user access
5472 * Do a check when the kernel creates a new BPF map. This is also the
5473 * point where LSM blob is allocated for LSMs that need them.
5475 * Return: Returns 0 on success, error on failure.
5477 int security_bpf_map_create(struct bpf_map
*map
, union bpf_attr
*attr
,
5478 struct bpf_token
*token
)
5480 return call_int_hook(bpf_map_create
, map
, attr
, token
);
5484 * security_bpf_prog_load() - Check if loading of BPF program is allowed
5485 * @prog: BPF program object
5486 * @attr: BPF syscall attributes used to create BPF program
5487 * @token: BPF token used to grant user access to BPF subsystem
5489 * Perform an access control check when the kernel loads a BPF program and
5490 * allocates associated BPF program object. This hook is also responsible for
5491 * allocating any required LSM state for the BPF program.
5493 * Return: Returns 0 on success, error on failure.
5495 int security_bpf_prog_load(struct bpf_prog
*prog
, union bpf_attr
*attr
,
5496 struct bpf_token
*token
)
5498 return call_int_hook(bpf_prog_load
, prog
, attr
, token
);
5502 * security_bpf_token_create() - Check if creating of BPF token is allowed
5503 * @token: BPF token object
5504 * @attr: BPF syscall attributes used to create BPF token
5505 * @path: path pointing to BPF FS mount point from which BPF token is created
5507 * Do a check when the kernel instantiates a new BPF token object from BPF FS
5508 * instance. This is also the point where LSM blob can be allocated for LSMs.
5510 * Return: Returns 0 on success, error on failure.
5512 int security_bpf_token_create(struct bpf_token
*token
, union bpf_attr
*attr
,
5515 return call_int_hook(bpf_token_create
, token
, attr
, path
);
5519 * security_bpf_token_cmd() - Check if BPF token is allowed to delegate
5520 * requested BPF syscall command
5521 * @token: BPF token object
5522 * @cmd: BPF syscall command requested to be delegated by BPF token
5524 * Do a check when the kernel decides whether provided BPF token should allow
5525 * delegation of requested BPF syscall command.
5527 * Return: Returns 0 on success, error on failure.
5529 int security_bpf_token_cmd(const struct bpf_token
*token
, enum bpf_cmd cmd
)
5531 return call_int_hook(bpf_token_cmd
, token
, cmd
);
5535 * security_bpf_token_capable() - Check if BPF token is allowed to delegate
5536 * requested BPF-related capability
5537 * @token: BPF token object
5538 * @cap: capabilities requested to be delegated by BPF token
5540 * Do a check when the kernel decides whether provided BPF token should allow
5541 * delegation of requested BPF-related capabilities.
5543 * Return: Returns 0 on success, error on failure.
5545 int security_bpf_token_capable(const struct bpf_token
*token
, int cap
)
5547 return call_int_hook(bpf_token_capable
, token
, cap
);
5551 * security_bpf_map_free() - Free a bpf map's LSM blob
5554 * Clean up the security information stored inside bpf map.
5556 void security_bpf_map_free(struct bpf_map
*map
)
5558 call_void_hook(bpf_map_free
, map
);
5562 * security_bpf_prog_free() - Free a BPF program's LSM blob
5563 * @prog: BPF program struct
5565 * Clean up the security information stored inside BPF program.
5567 void security_bpf_prog_free(struct bpf_prog
*prog
)
5569 call_void_hook(bpf_prog_free
, prog
);
5573 * security_bpf_token_free() - Free a BPF token's LSM blob
5574 * @token: BPF token struct
5576 * Clean up the security information stored inside BPF token.
5578 void security_bpf_token_free(struct bpf_token
*token
)
5580 call_void_hook(bpf_token_free
, token
);
5582 #endif /* CONFIG_BPF_SYSCALL */
5585 * security_locked_down() - Check if a kernel feature is allowed
5586 * @what: requested kernel feature
5588 * Determine whether a kernel feature that potentially enables arbitrary code
5589 * execution in kernel space should be permitted.
5591 * Return: Returns 0 if permission is granted.
5593 int security_locked_down(enum lockdown_reason what
)
5595 return call_int_hook(locked_down
, what
);
5597 EXPORT_SYMBOL(security_locked_down
);
5599 #ifdef CONFIG_PERF_EVENTS
5601 * security_perf_event_open() - Check if a perf event open is allowed
5602 * @attr: perf event attribute
5603 * @type: type of event
5605 * Check whether the @type of perf_event_open syscall is allowed.
5607 * Return: Returns 0 if permission is granted.
5609 int security_perf_event_open(struct perf_event_attr
*attr
, int type
)
5611 return call_int_hook(perf_event_open
, attr
, type
);
5615 * security_perf_event_alloc() - Allocate a perf event LSM blob
5616 * @event: perf event
5618 * Allocate and save perf_event security info.
5620 * Return: Returns 0 on success, error on failure.
5622 int security_perf_event_alloc(struct perf_event
*event
)
5624 return call_int_hook(perf_event_alloc
, event
);
5628 * security_perf_event_free() - Free a perf event LSM blob
5629 * @event: perf event
5631 * Release (free) perf_event security info.
5633 void security_perf_event_free(struct perf_event
*event
)
5635 call_void_hook(perf_event_free
, event
);
5639 * security_perf_event_read() - Check if reading a perf event label is allowed
5640 * @event: perf event
5642 * Read perf_event security info if allowed.
5644 * Return: Returns 0 if permission is granted.
5646 int security_perf_event_read(struct perf_event
*event
)
5648 return call_int_hook(perf_event_read
, event
);
5652 * security_perf_event_write() - Check if writing a perf event label is allowed
5653 * @event: perf event
5655 * Write perf_event security info if allowed.
5657 * Return: Returns 0 if permission is granted.
5659 int security_perf_event_write(struct perf_event
*event
)
5661 return call_int_hook(perf_event_write
, event
);
5663 #endif /* CONFIG_PERF_EVENTS */
5665 #ifdef CONFIG_IO_URING
5667 * security_uring_override_creds() - Check if overriding creds is allowed
5668 * @new: new credentials
5670 * Check if the current task, executing an io_uring operation, is allowed to
5671 * override it's credentials with @new.
5673 * Return: Returns 0 if permission is granted.
5675 int security_uring_override_creds(const struct cred
*new)
5677 return call_int_hook(uring_override_creds
, new);
5681 * security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
5683 * Check whether the current task is allowed to spawn a io_uring polling thread
5684 * (IORING_SETUP_SQPOLL).
5686 * Return: Returns 0 if permission is granted.
5688 int security_uring_sqpoll(void)
5690 return call_int_hook(uring_sqpoll
);
5694 * security_uring_cmd() - Check if a io_uring passthrough command is allowed
5697 * Check whether the file_operations uring_cmd is allowed to run.
5699 * Return: Returns 0 if permission is granted.
5701 int security_uring_cmd(struct io_uring_cmd
*ioucmd
)
5703 return call_int_hook(uring_cmd
, ioucmd
);
5705 #endif /* CONFIG_IO_URING */