2 * Implementation of the kernel access vector cache (AVC).
4 * Authors: Stephen Smalley, <sds@epoch.ncsc.mil>
5 * James Morris <jmorris@redhat.com>
7 * Update: KaiGai, Kohei <kaigai@ak.jp.nec.com>
8 * Replaced the avc_lock spinlock by RCU.
10 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2,
14 * as published by the Free Software Foundation.
16 #include <linux/types.h>
17 #include <linux/stddef.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
21 #include <linux/dcache.h>
22 #include <linux/init.h>
23 #include <linux/skbuff.h>
24 #include <linux/percpu.h>
27 #include <net/af_unix.h>
29 #include <linux/audit.h>
30 #include <linux/ipv6.h>
35 static const struct av_perm_to_string
40 } av_perm_to_string
[] = {
41 #define S_(c, v, s) { c, v, s },
42 #include "av_perm_to_string.h"
47 static const char *class_to_string
[] = {
49 #include "class_to_string.h"
54 #define TB_(s) static const char * s [] = {
57 #include "common_perm_to_string.h"
62 static const struct av_inherit
65 const char **common_pts
;
68 #define S_(c, i, b) { c, common_##i##_perm_to_string, b },
69 #include "av_inherit.h"
73 #define AVC_CACHE_SLOTS 512
74 #define AVC_DEF_CACHE_THRESHOLD 512
75 #define AVC_CACHE_RECLAIM 16
77 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
78 #define avc_cache_stats_incr(field) \
80 per_cpu(avc_cache_stats, get_cpu()).field++; \
84 #define avc_cache_stats_incr(field) do {} while (0)
91 struct av_decision avd
;
92 atomic_t used
; /* used recently */
97 struct list_head list
;
98 struct rcu_head rhead
;
102 struct list_head slots
[AVC_CACHE_SLOTS
];
103 spinlock_t slots_lock
[AVC_CACHE_SLOTS
]; /* lock for writes */
104 atomic_t lru_hint
; /* LRU hint for reclaim scan */
105 atomic_t active_nodes
;
106 u32 latest_notif
; /* latest revocation notification */
109 struct avc_callback_node
{
110 int (*callback
) (u32 event
, u32 ssid
, u32 tsid
,
111 u16 tclass
, u32 perms
,
118 struct avc_callback_node
*next
;
121 /* Exported via selinufs */
122 unsigned int avc_cache_threshold
= AVC_DEF_CACHE_THRESHOLD
;
124 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
125 DEFINE_PER_CPU(struct avc_cache_stats
, avc_cache_stats
) = { 0 };
128 static struct avc_cache avc_cache
;
129 static struct avc_callback_node
*avc_callbacks
;
130 static kmem_cache_t
*avc_node_cachep
;
132 static inline int avc_hash(u32 ssid
, u32 tsid
, u16 tclass
)
134 return (ssid
^ (tsid
<<2) ^ (tclass
<<4)) & (AVC_CACHE_SLOTS
- 1);
138 * avc_dump_av - Display an access vector in human-readable form.
139 * @tclass: target security class
142 static void avc_dump_av(struct audit_buffer
*ab
, u16 tclass
, u32 av
)
144 const char **common_pts
= NULL
;
149 audit_log_format(ab
, " null");
153 for (i
= 0; i
< ARRAY_SIZE(av_inherit
); i
++) {
154 if (av_inherit
[i
].tclass
== tclass
) {
155 common_pts
= av_inherit
[i
].common_pts
;
156 common_base
= av_inherit
[i
].common_base
;
161 audit_log_format(ab
, " {");
164 while (perm
< common_base
) {
166 audit_log_format(ab
, " %s", common_pts
[i
]);
173 while (i
< sizeof(av
) * 8) {
175 for (i2
= 0; i2
< ARRAY_SIZE(av_perm_to_string
); i2
++) {
176 if ((av_perm_to_string
[i2
].tclass
== tclass
) &&
177 (av_perm_to_string
[i2
].value
== perm
))
180 if (i2
< ARRAY_SIZE(av_perm_to_string
)) {
181 audit_log_format(ab
, " %s",
182 av_perm_to_string
[i2
].name
);
191 audit_log_format(ab
, " 0x%x", av
);
193 audit_log_format(ab
, " }");
197 * avc_dump_query - Display a SID pair and a class in human-readable form.
198 * @ssid: source security identifier
199 * @tsid: target security identifier
200 * @tclass: target security class
202 static void avc_dump_query(struct audit_buffer
*ab
, u32 ssid
, u32 tsid
, u16 tclass
)
208 rc
= security_sid_to_context(ssid
, &scontext
, &scontext_len
);
210 audit_log_format(ab
, "ssid=%d", ssid
);
212 audit_log_format(ab
, "scontext=%s", scontext
);
216 rc
= security_sid_to_context(tsid
, &scontext
, &scontext_len
);
218 audit_log_format(ab
, " tsid=%d", tsid
);
220 audit_log_format(ab
, " tcontext=%s", scontext
);
223 audit_log_format(ab
, " tclass=%s", class_to_string
[tclass
]);
227 * avc_init - Initialize the AVC.
229 * Initialize the access vector cache.
231 void __init
avc_init(void)
235 for (i
= 0; i
< AVC_CACHE_SLOTS
; i
++) {
236 INIT_LIST_HEAD(&avc_cache
.slots
[i
]);
237 spin_lock_init(&avc_cache
.slots_lock
[i
]);
239 atomic_set(&avc_cache
.active_nodes
, 0);
240 atomic_set(&avc_cache
.lru_hint
, 0);
242 avc_node_cachep
= kmem_cache_create("avc_node", sizeof(struct avc_node
),
243 0, SLAB_PANIC
, NULL
, NULL
);
245 audit_log(current
->audit_context
, GFP_KERNEL
, AUDIT_KERNEL
, "AVC INITIALIZED\n");
248 int avc_get_hash_stats(char *page
)
250 int i
, chain_len
, max_chain_len
, slots_used
;
251 struct avc_node
*node
;
257 for (i
= 0; i
< AVC_CACHE_SLOTS
; i
++) {
258 if (!list_empty(&avc_cache
.slots
[i
])) {
261 list_for_each_entry_rcu(node
, &avc_cache
.slots
[i
], list
)
263 if (chain_len
> max_chain_len
)
264 max_chain_len
= chain_len
;
270 return scnprintf(page
, PAGE_SIZE
, "entries: %d\nbuckets used: %d/%d\n"
271 "longest chain: %d\n",
272 atomic_read(&avc_cache
.active_nodes
),
273 slots_used
, AVC_CACHE_SLOTS
, max_chain_len
);
276 static void avc_node_free(struct rcu_head
*rhead
)
278 struct avc_node
*node
= container_of(rhead
, struct avc_node
, rhead
);
279 kmem_cache_free(avc_node_cachep
, node
);
280 avc_cache_stats_incr(frees
);
283 static void avc_node_delete(struct avc_node
*node
)
285 list_del_rcu(&node
->list
);
286 call_rcu(&node
->rhead
, avc_node_free
);
287 atomic_dec(&avc_cache
.active_nodes
);
290 static void avc_node_kill(struct avc_node
*node
)
292 kmem_cache_free(avc_node_cachep
, node
);
293 avc_cache_stats_incr(frees
);
294 atomic_dec(&avc_cache
.active_nodes
);
297 static void avc_node_replace(struct avc_node
*new, struct avc_node
*old
)
299 list_replace_rcu(&old
->list
, &new->list
);
300 call_rcu(&old
->rhead
, avc_node_free
);
301 atomic_dec(&avc_cache
.active_nodes
);
304 static inline int avc_reclaim_node(void)
306 struct avc_node
*node
;
307 int hvalue
, try, ecx
;
310 for (try = 0, ecx
= 0; try < AVC_CACHE_SLOTS
; try++ ) {
311 hvalue
= atomic_inc_return(&avc_cache
.lru_hint
) & (AVC_CACHE_SLOTS
- 1);
313 if (!spin_trylock_irqsave(&avc_cache
.slots_lock
[hvalue
], flags
))
316 list_for_each_entry(node
, &avc_cache
.slots
[hvalue
], list
) {
317 if (atomic_dec_and_test(&node
->ae
.used
)) {
318 /* Recently Unused */
319 avc_node_delete(node
);
320 avc_cache_stats_incr(reclaims
);
322 if (ecx
>= AVC_CACHE_RECLAIM
) {
323 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flags
);
328 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flags
);
334 static struct avc_node
*avc_alloc_node(void)
336 struct avc_node
*node
;
338 node
= kmem_cache_alloc(avc_node_cachep
, SLAB_ATOMIC
);
342 memset(node
, 0, sizeof(*node
));
343 INIT_RCU_HEAD(&node
->rhead
);
344 INIT_LIST_HEAD(&node
->list
);
345 atomic_set(&node
->ae
.used
, 1);
346 avc_cache_stats_incr(allocations
);
348 if (atomic_inc_return(&avc_cache
.active_nodes
) > avc_cache_threshold
)
355 static void avc_node_populate(struct avc_node
*node
, u32 ssid
, u32 tsid
, u16 tclass
, struct avc_entry
*ae
)
357 node
->ae
.ssid
= ssid
;
358 node
->ae
.tsid
= tsid
;
359 node
->ae
.tclass
= tclass
;
360 memcpy(&node
->ae
.avd
, &ae
->avd
, sizeof(node
->ae
.avd
));
363 static inline struct avc_node
*avc_search_node(u32 ssid
, u32 tsid
, u16 tclass
)
365 struct avc_node
*node
, *ret
= NULL
;
368 hvalue
= avc_hash(ssid
, tsid
, tclass
);
369 list_for_each_entry_rcu(node
, &avc_cache
.slots
[hvalue
], list
) {
370 if (ssid
== node
->ae
.ssid
&&
371 tclass
== node
->ae
.tclass
&&
372 tsid
== node
->ae
.tsid
) {
384 if (atomic_read(&ret
->ae
.used
) != 1)
385 atomic_set(&ret
->ae
.used
, 1);
391 * avc_lookup - Look up an AVC entry.
392 * @ssid: source security identifier
393 * @tsid: target security identifier
394 * @tclass: target security class
395 * @requested: requested permissions, interpreted based on @tclass
397 * Look up an AVC entry that is valid for the
398 * @requested permissions between the SID pair
399 * (@ssid, @tsid), interpreting the permissions
400 * based on @tclass. If a valid AVC entry exists,
401 * then this function return the avc_node.
402 * Otherwise, this function returns NULL.
404 static struct avc_node
*avc_lookup(u32 ssid
, u32 tsid
, u16 tclass
, u32 requested
)
406 struct avc_node
*node
;
408 avc_cache_stats_incr(lookups
);
409 node
= avc_search_node(ssid
, tsid
, tclass
);
411 if (node
&& ((node
->ae
.avd
.decided
& requested
) == requested
)) {
412 avc_cache_stats_incr(hits
);
417 avc_cache_stats_incr(misses
);
422 static int avc_latest_notif_update(int seqno
, int is_insert
)
425 static DEFINE_SPINLOCK(notif_lock
);
428 spin_lock_irqsave(¬if_lock
, flag
);
430 if (seqno
< avc_cache
.latest_notif
) {
431 printk(KERN_WARNING
"avc: seqno %d < latest_notif %d\n",
432 seqno
, avc_cache
.latest_notif
);
436 if (seqno
> avc_cache
.latest_notif
)
437 avc_cache
.latest_notif
= seqno
;
439 spin_unlock_irqrestore(¬if_lock
, flag
);
445 * avc_insert - Insert an AVC entry.
446 * @ssid: source security identifier
447 * @tsid: target security identifier
448 * @tclass: target security class
451 * Insert an AVC entry for the SID pair
452 * (@ssid, @tsid) and class @tclass.
453 * The access vectors and the sequence number are
454 * normally provided by the security server in
455 * response to a security_compute_av() call. If the
456 * sequence number @ae->avd.seqno is not less than the latest
457 * revocation notification, then the function copies
458 * the access vectors into a cache entry, returns
459 * avc_node inserted. Otherwise, this function returns NULL.
461 static struct avc_node
*avc_insert(u32 ssid
, u32 tsid
, u16 tclass
, struct avc_entry
*ae
)
463 struct avc_node
*pos
, *node
= NULL
;
467 if (avc_latest_notif_update(ae
->avd
.seqno
, 1))
470 node
= avc_alloc_node();
472 hvalue
= avc_hash(ssid
, tsid
, tclass
);
473 avc_node_populate(node
, ssid
, tsid
, tclass
, ae
);
475 spin_lock_irqsave(&avc_cache
.slots_lock
[hvalue
], flag
);
476 list_for_each_entry(pos
, &avc_cache
.slots
[hvalue
], list
) {
477 if (pos
->ae
.ssid
== ssid
&&
478 pos
->ae
.tsid
== tsid
&&
479 pos
->ae
.tclass
== tclass
) {
480 avc_node_replace(node
, pos
);
484 list_add_rcu(&node
->list
, &avc_cache
.slots
[hvalue
]);
486 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flag
);
492 static inline void avc_print_ipv6_addr(struct audit_buffer
*ab
,
493 struct in6_addr
*addr
, __be16 port
,
494 char *name1
, char *name2
)
496 if (!ipv6_addr_any(addr
))
497 audit_log_format(ab
, " %s=" NIP6_FMT
, name1
, NIP6(*addr
));
499 audit_log_format(ab
, " %s=%d", name2
, ntohs(port
));
502 static inline void avc_print_ipv4_addr(struct audit_buffer
*ab
, u32 addr
,
503 __be16 port
, char *name1
, char *name2
)
506 audit_log_format(ab
, " %s=" NIPQUAD_FMT
, name1
, NIPQUAD(addr
));
508 audit_log_format(ab
, " %s=%d", name2
, ntohs(port
));
512 * avc_audit - Audit the granting or denial of permissions.
513 * @ssid: source security identifier
514 * @tsid: target security identifier
515 * @tclass: target security class
516 * @requested: requested permissions
517 * @avd: access vector decisions
518 * @result: result from avc_has_perm_noaudit
519 * @a: auxiliary audit data
521 * Audit the granting or denial of permissions in accordance
522 * with the policy. This function is typically called by
523 * avc_has_perm() after a permission check, but can also be
524 * called directly by callers who use avc_has_perm_noaudit()
525 * in order to separate the permission check from the auditing.
526 * For example, this separation is useful when the permission check must
527 * be performed under a lock, to allow the lock to be released
528 * before calling the auditing code.
530 void avc_audit(u32 ssid
, u32 tsid
,
531 u16 tclass
, u32 requested
,
532 struct av_decision
*avd
, int result
, struct avc_audit_data
*a
)
534 struct task_struct
*tsk
= current
;
535 struct inode
*inode
= NULL
;
537 struct audit_buffer
*ab
;
539 denied
= requested
& ~avd
->allowed
;
542 if (!(audited
& avd
->auditdeny
))
545 audited
= denied
= requested
;
548 if (!(audited
& avd
->auditallow
))
552 ab
= audit_log_start(current
->audit_context
, GFP_ATOMIC
, AUDIT_AVC
);
554 return; /* audit_panic has been called */
555 audit_log_format(ab
, "avc: %s ", denied
? "denied" : "granted");
556 avc_dump_av(ab
, tclass
,audited
);
557 audit_log_format(ab
, " for ");
560 if (tsk
&& tsk
->pid
) {
561 audit_log_format(ab
, " pid=%d comm=", tsk
->pid
);
562 audit_log_untrustedstring(ab
, tsk
->comm
);
566 case AVC_AUDIT_DATA_IPC
:
567 audit_log_format(ab
, " key=%d", a
->u
.ipc_id
);
569 case AVC_AUDIT_DATA_CAP
:
570 audit_log_format(ab
, " capability=%d", a
->u
.cap
);
572 case AVC_AUDIT_DATA_FS
:
573 if (a
->u
.fs
.dentry
) {
574 struct dentry
*dentry
= a
->u
.fs
.dentry
;
576 audit_avc_path(dentry
, a
->u
.fs
.mnt
);
577 audit_log_format(ab
, " name=");
578 audit_log_untrustedstring(ab
, dentry
->d_name
.name
);
579 inode
= dentry
->d_inode
;
580 } else if (a
->u
.fs
.inode
) {
581 struct dentry
*dentry
;
582 inode
= a
->u
.fs
.inode
;
583 dentry
= d_find_alias(inode
);
585 audit_log_format(ab
, " name=");
586 audit_log_untrustedstring(ab
, dentry
->d_name
.name
);
591 audit_log_format(ab
, " dev=%s ino=%ld",
595 case AVC_AUDIT_DATA_NET
:
597 struct sock
*sk
= a
->u
.net
.sk
;
602 switch (sk
->sk_family
) {
604 struct inet_sock
*inet
= inet_sk(sk
);
606 avc_print_ipv4_addr(ab
, inet
->rcv_saddr
,
609 avc_print_ipv4_addr(ab
, inet
->daddr
,
615 struct inet_sock
*inet
= inet_sk(sk
);
616 struct ipv6_pinfo
*inet6
= inet6_sk(sk
);
618 avc_print_ipv6_addr(ab
, &inet6
->rcv_saddr
,
621 avc_print_ipv6_addr(ab
, &inet6
->daddr
,
629 audit_avc_path(u
->dentry
, u
->mnt
);
630 audit_log_format(ab
, " name=");
631 audit_log_untrustedstring(ab
, u
->dentry
->d_name
.name
);
636 len
= u
->addr
->len
-sizeof(short);
637 p
= &u
->addr
->name
->sun_path
[0];
638 audit_log_format(ab
, " path=");
640 audit_log_untrustedstring(ab
, p
);
642 audit_log_hex(ab
, p
, len
);
647 switch (a
->u
.net
.family
) {
649 avc_print_ipv4_addr(ab
, a
->u
.net
.v4info
.saddr
,
652 avc_print_ipv4_addr(ab
, a
->u
.net
.v4info
.daddr
,
657 avc_print_ipv6_addr(ab
, &a
->u
.net
.v6info
.saddr
,
660 avc_print_ipv6_addr(ab
, &a
->u
.net
.v6info
.daddr
,
666 audit_log_format(ab
, " netif=%s",
671 audit_log_format(ab
, " ");
672 avc_dump_query(ab
, ssid
, tsid
, tclass
);
677 * avc_add_callback - Register a callback for security events.
678 * @callback: callback function
679 * @events: security events
680 * @ssid: source security identifier or %SECSID_WILD
681 * @tsid: target security identifier or %SECSID_WILD
682 * @tclass: target security class
683 * @perms: permissions
685 * Register a callback function for events in the set @events
686 * related to the SID pair (@ssid, @tsid) and
687 * and the permissions @perms, interpreting
688 * @perms based on @tclass. Returns %0 on success or
689 * -%ENOMEM if insufficient memory exists to add the callback.
691 int avc_add_callback(int (*callback
)(u32 event
, u32 ssid
, u32 tsid
,
692 u16 tclass
, u32 perms
,
694 u32 events
, u32 ssid
, u32 tsid
,
695 u16 tclass
, u32 perms
)
697 struct avc_callback_node
*c
;
700 c
= kmalloc(sizeof(*c
), GFP_ATOMIC
);
706 c
->callback
= callback
;
711 c
->next
= avc_callbacks
;
717 static inline int avc_sidcmp(u32 x
, u32 y
)
719 return (x
== y
|| x
== SECSID_WILD
|| y
== SECSID_WILD
);
723 * avc_update_node Update an AVC entry
724 * @event : Updating event
725 * @perms : Permission mask bits
726 * @ssid,@tsid,@tclass : identifier of an AVC entry
728 * if a valid AVC entry doesn't exist,this function returns -ENOENT.
729 * if kmalloc() called internal returns NULL, this function returns -ENOMEM.
730 * otherwise, this function update the AVC entry. The original AVC-entry object
731 * will release later by RCU.
733 static int avc_update_node(u32 event
, u32 perms
, u32 ssid
, u32 tsid
, u16 tclass
)
737 struct avc_node
*pos
, *node
, *orig
= NULL
;
739 node
= avc_alloc_node();
745 /* Lock the target slot */
746 hvalue
= avc_hash(ssid
, tsid
, tclass
);
747 spin_lock_irqsave(&avc_cache
.slots_lock
[hvalue
], flag
);
749 list_for_each_entry(pos
, &avc_cache
.slots
[hvalue
], list
){
750 if ( ssid
==pos
->ae
.ssid
&&
751 tsid
==pos
->ae
.tsid
&&
752 tclass
==pos
->ae
.tclass
){
765 * Copy and replace original node.
768 avc_node_populate(node
, ssid
, tsid
, tclass
, &orig
->ae
);
771 case AVC_CALLBACK_GRANT
:
772 node
->ae
.avd
.allowed
|= perms
;
774 case AVC_CALLBACK_TRY_REVOKE
:
775 case AVC_CALLBACK_REVOKE
:
776 node
->ae
.avd
.allowed
&= ~perms
;
778 case AVC_CALLBACK_AUDITALLOW_ENABLE
:
779 node
->ae
.avd
.auditallow
|= perms
;
781 case AVC_CALLBACK_AUDITALLOW_DISABLE
:
782 node
->ae
.avd
.auditallow
&= ~perms
;
784 case AVC_CALLBACK_AUDITDENY_ENABLE
:
785 node
->ae
.avd
.auditdeny
|= perms
;
787 case AVC_CALLBACK_AUDITDENY_DISABLE
:
788 node
->ae
.avd
.auditdeny
&= ~perms
;
791 avc_node_replace(node
, orig
);
793 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flag
);
799 * avc_ss_reset - Flush the cache and revalidate migrated permissions.
800 * @seqno: policy sequence number
802 int avc_ss_reset(u32 seqno
)
804 struct avc_callback_node
*c
;
807 struct avc_node
*node
;
809 for (i
= 0; i
< AVC_CACHE_SLOTS
; i
++) {
810 spin_lock_irqsave(&avc_cache
.slots_lock
[i
], flag
);
811 list_for_each_entry(node
, &avc_cache
.slots
[i
], list
)
812 avc_node_delete(node
);
813 spin_unlock_irqrestore(&avc_cache
.slots_lock
[i
], flag
);
816 for (c
= avc_callbacks
; c
; c
= c
->next
) {
817 if (c
->events
& AVC_CALLBACK_RESET
) {
818 rc
= c
->callback(AVC_CALLBACK_RESET
,
825 avc_latest_notif_update(seqno
, 0);
831 * avc_has_perm_noaudit - Check permissions but perform no auditing.
832 * @ssid: source security identifier
833 * @tsid: target security identifier
834 * @tclass: target security class
835 * @requested: requested permissions, interpreted based on @tclass
836 * @avd: access vector decisions
838 * Check the AVC to determine whether the @requested permissions are granted
839 * for the SID pair (@ssid, @tsid), interpreting the permissions
840 * based on @tclass, and call the security server on a cache miss to obtain
841 * a new decision and add it to the cache. Return a copy of the decisions
842 * in @avd. Return %0 if all @requested permissions are granted,
843 * -%EACCES if any permissions are denied, or another -errno upon
844 * other errors. This function is typically called by avc_has_perm(),
845 * but may also be called directly to separate permission checking from
846 * auditing, e.g. in cases where a lock must be held for the check but
847 * should be released for the auditing.
849 int avc_has_perm_noaudit(u32 ssid
, u32 tsid
,
850 u16 tclass
, u32 requested
,
851 struct av_decision
*avd
)
853 struct avc_node
*node
;
854 struct avc_entry entry
, *p_ae
;
860 node
= avc_lookup(ssid
, tsid
, tclass
, requested
);
863 rc
= security_compute_av(ssid
,tsid
,tclass
,requested
,&entry
.avd
);
867 node
= avc_insert(ssid
,tsid
,tclass
,&entry
);
870 p_ae
= node
? &node
->ae
: &entry
;
873 memcpy(avd
, &p_ae
->avd
, sizeof(*avd
));
875 denied
= requested
& ~(p_ae
->avd
.allowed
);
877 if (!requested
|| denied
) {
878 if (selinux_enforcing
)
882 avc_update_node(AVC_CALLBACK_GRANT
,requested
,
892 * avc_has_perm - Check permissions and perform any appropriate auditing.
893 * @ssid: source security identifier
894 * @tsid: target security identifier
895 * @tclass: target security class
896 * @requested: requested permissions, interpreted based on @tclass
897 * @auditdata: auxiliary audit data
899 * Check the AVC to determine whether the @requested permissions are granted
900 * for the SID pair (@ssid, @tsid), interpreting the permissions
901 * based on @tclass, and call the security server on a cache miss to obtain
902 * a new decision and add it to the cache. Audit the granting or denial of
903 * permissions in accordance with the policy. Return %0 if all @requested
904 * permissions are granted, -%EACCES if any permissions are denied, or
905 * another -errno upon other errors.
907 int avc_has_perm(u32 ssid
, u32 tsid
, u16 tclass
,
908 u32 requested
, struct avc_audit_data
*auditdata
)
910 struct av_decision avd
;
913 rc
= avc_has_perm_noaudit(ssid
, tsid
, tclass
, requested
, &avd
);
914 avc_audit(ssid
, tsid
, tclass
, requested
, &avd
, rc
, auditdata
);