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 av_perm_to_string
[] = {
36 #define S_(c, v, s) { c, v, s },
37 #include "av_perm_to_string.h"
41 static const char *class_to_string
[] = {
43 #include "class_to_string.h"
47 #define TB_(s) static const char * s [] = {
50 #include "common_perm_to_string.h"
55 static const struct av_inherit av_inherit
[] = {
56 #define S_(c, i, b) { c, common_##i##_perm_to_string, b },
57 #include "av_inherit.h"
61 const struct selinux_class_perm selinux_class_perm
= {
63 ARRAY_SIZE(av_perm_to_string
),
65 ARRAY_SIZE(class_to_string
),
67 ARRAY_SIZE(av_inherit
)
70 #define AVC_CACHE_SLOTS 512
71 #define AVC_DEF_CACHE_THRESHOLD 512
72 #define AVC_CACHE_RECLAIM 16
74 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
75 #define avc_cache_stats_incr(field) \
77 per_cpu(avc_cache_stats, get_cpu()).field++; \
81 #define avc_cache_stats_incr(field) do {} while (0)
88 struct av_decision avd
;
89 atomic_t used
; /* used recently */
94 struct list_head list
;
95 struct rcu_head rhead
;
99 struct list_head slots
[AVC_CACHE_SLOTS
];
100 spinlock_t slots_lock
[AVC_CACHE_SLOTS
]; /* lock for writes */
101 atomic_t lru_hint
; /* LRU hint for reclaim scan */
102 atomic_t active_nodes
;
103 u32 latest_notif
; /* latest revocation notification */
106 struct avc_callback_node
{
107 int (*callback
) (u32 event
, u32 ssid
, u32 tsid
,
108 u16 tclass
, u32 perms
,
115 struct avc_callback_node
*next
;
118 /* Exported via selinufs */
119 unsigned int avc_cache_threshold
= AVC_DEF_CACHE_THRESHOLD
;
121 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
122 DEFINE_PER_CPU(struct avc_cache_stats
, avc_cache_stats
) = { 0 };
125 static struct avc_cache avc_cache
;
126 static struct avc_callback_node
*avc_callbacks
;
127 static struct kmem_cache
*avc_node_cachep
;
129 static inline int avc_hash(u32 ssid
, u32 tsid
, u16 tclass
)
131 return (ssid
^ (tsid
<<2) ^ (tclass
<<4)) & (AVC_CACHE_SLOTS
- 1);
135 * avc_dump_av - Display an access vector in human-readable form.
136 * @tclass: target security class
139 static void avc_dump_av(struct audit_buffer
*ab
, u16 tclass
, u32 av
)
141 const char **common_pts
= NULL
;
146 audit_log_format(ab
, " null");
150 for (i
= 0; i
< ARRAY_SIZE(av_inherit
); i
++) {
151 if (av_inherit
[i
].tclass
== tclass
) {
152 common_pts
= av_inherit
[i
].common_pts
;
153 common_base
= av_inherit
[i
].common_base
;
158 audit_log_format(ab
, " {");
161 while (perm
< common_base
) {
163 audit_log_format(ab
, " %s", common_pts
[i
]);
170 while (i
< sizeof(av
) * 8) {
172 for (i2
= 0; i2
< ARRAY_SIZE(av_perm_to_string
); i2
++) {
173 if ((av_perm_to_string
[i2
].tclass
== tclass
) &&
174 (av_perm_to_string
[i2
].value
== perm
))
177 if (i2
< ARRAY_SIZE(av_perm_to_string
)) {
178 audit_log_format(ab
, " %s",
179 av_perm_to_string
[i2
].name
);
188 audit_log_format(ab
, " 0x%x", av
);
190 audit_log_format(ab
, " }");
194 * avc_dump_query - Display a SID pair and a class in human-readable form.
195 * @ssid: source security identifier
196 * @tsid: target security identifier
197 * @tclass: target security class
199 static void avc_dump_query(struct audit_buffer
*ab
, u32 ssid
, u32 tsid
, u16 tclass
)
205 rc
= security_sid_to_context(ssid
, &scontext
, &scontext_len
);
207 audit_log_format(ab
, "ssid=%d", ssid
);
209 audit_log_format(ab
, "scontext=%s", scontext
);
213 rc
= security_sid_to_context(tsid
, &scontext
, &scontext_len
);
215 audit_log_format(ab
, " tsid=%d", tsid
);
217 audit_log_format(ab
, " tcontext=%s", scontext
);
220 audit_log_format(ab
, " tclass=%s", class_to_string
[tclass
]);
224 * avc_init - Initialize the AVC.
226 * Initialize the access vector cache.
228 void __init
avc_init(void)
232 for (i
= 0; i
< AVC_CACHE_SLOTS
; i
++) {
233 INIT_LIST_HEAD(&avc_cache
.slots
[i
]);
234 spin_lock_init(&avc_cache
.slots_lock
[i
]);
236 atomic_set(&avc_cache
.active_nodes
, 0);
237 atomic_set(&avc_cache
.lru_hint
, 0);
239 avc_node_cachep
= kmem_cache_create("avc_node", sizeof(struct avc_node
),
240 0, SLAB_PANIC
, NULL
, NULL
);
242 audit_log(current
->audit_context
, GFP_KERNEL
, AUDIT_KERNEL
, "AVC INITIALIZED\n");
245 int avc_get_hash_stats(char *page
)
247 int i
, chain_len
, max_chain_len
, slots_used
;
248 struct avc_node
*node
;
254 for (i
= 0; i
< AVC_CACHE_SLOTS
; i
++) {
255 if (!list_empty(&avc_cache
.slots
[i
])) {
258 list_for_each_entry_rcu(node
, &avc_cache
.slots
[i
], list
)
260 if (chain_len
> max_chain_len
)
261 max_chain_len
= chain_len
;
267 return scnprintf(page
, PAGE_SIZE
, "entries: %d\nbuckets used: %d/%d\n"
268 "longest chain: %d\n",
269 atomic_read(&avc_cache
.active_nodes
),
270 slots_used
, AVC_CACHE_SLOTS
, max_chain_len
);
273 static void avc_node_free(struct rcu_head
*rhead
)
275 struct avc_node
*node
= container_of(rhead
, struct avc_node
, rhead
);
276 kmem_cache_free(avc_node_cachep
, node
);
277 avc_cache_stats_incr(frees
);
280 static void avc_node_delete(struct avc_node
*node
)
282 list_del_rcu(&node
->list
);
283 call_rcu(&node
->rhead
, avc_node_free
);
284 atomic_dec(&avc_cache
.active_nodes
);
287 static void avc_node_kill(struct avc_node
*node
)
289 kmem_cache_free(avc_node_cachep
, node
);
290 avc_cache_stats_incr(frees
);
291 atomic_dec(&avc_cache
.active_nodes
);
294 static void avc_node_replace(struct avc_node
*new, struct avc_node
*old
)
296 list_replace_rcu(&old
->list
, &new->list
);
297 call_rcu(&old
->rhead
, avc_node_free
);
298 atomic_dec(&avc_cache
.active_nodes
);
301 static inline int avc_reclaim_node(void)
303 struct avc_node
*node
;
304 int hvalue
, try, ecx
;
307 for (try = 0, ecx
= 0; try < AVC_CACHE_SLOTS
; try++ ) {
308 hvalue
= atomic_inc_return(&avc_cache
.lru_hint
) & (AVC_CACHE_SLOTS
- 1);
310 if (!spin_trylock_irqsave(&avc_cache
.slots_lock
[hvalue
], flags
))
313 list_for_each_entry(node
, &avc_cache
.slots
[hvalue
], list
) {
314 if (atomic_dec_and_test(&node
->ae
.used
)) {
315 /* Recently Unused */
316 avc_node_delete(node
);
317 avc_cache_stats_incr(reclaims
);
319 if (ecx
>= AVC_CACHE_RECLAIM
) {
320 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flags
);
325 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flags
);
331 static struct avc_node
*avc_alloc_node(void)
333 struct avc_node
*node
;
335 node
= kmem_cache_alloc(avc_node_cachep
, GFP_ATOMIC
);
339 memset(node
, 0, sizeof(*node
));
340 INIT_RCU_HEAD(&node
->rhead
);
341 INIT_LIST_HEAD(&node
->list
);
342 atomic_set(&node
->ae
.used
, 1);
343 avc_cache_stats_incr(allocations
);
345 if (atomic_inc_return(&avc_cache
.active_nodes
) > avc_cache_threshold
)
352 static void avc_node_populate(struct avc_node
*node
, u32 ssid
, u32 tsid
, u16 tclass
, struct avc_entry
*ae
)
354 node
->ae
.ssid
= ssid
;
355 node
->ae
.tsid
= tsid
;
356 node
->ae
.tclass
= tclass
;
357 memcpy(&node
->ae
.avd
, &ae
->avd
, sizeof(node
->ae
.avd
));
360 static inline struct avc_node
*avc_search_node(u32 ssid
, u32 tsid
, u16 tclass
)
362 struct avc_node
*node
, *ret
= NULL
;
365 hvalue
= avc_hash(ssid
, tsid
, tclass
);
366 list_for_each_entry_rcu(node
, &avc_cache
.slots
[hvalue
], list
) {
367 if (ssid
== node
->ae
.ssid
&&
368 tclass
== node
->ae
.tclass
&&
369 tsid
== node
->ae
.tsid
) {
381 if (atomic_read(&ret
->ae
.used
) != 1)
382 atomic_set(&ret
->ae
.used
, 1);
388 * avc_lookup - Look up an AVC entry.
389 * @ssid: source security identifier
390 * @tsid: target security identifier
391 * @tclass: target security class
392 * @requested: requested permissions, interpreted based on @tclass
394 * Look up an AVC entry that is valid for the
395 * @requested permissions between the SID pair
396 * (@ssid, @tsid), interpreting the permissions
397 * based on @tclass. If a valid AVC entry exists,
398 * then this function return the avc_node.
399 * Otherwise, this function returns NULL.
401 static struct avc_node
*avc_lookup(u32 ssid
, u32 tsid
, u16 tclass
, u32 requested
)
403 struct avc_node
*node
;
405 avc_cache_stats_incr(lookups
);
406 node
= avc_search_node(ssid
, tsid
, tclass
);
408 if (node
&& ((node
->ae
.avd
.decided
& requested
) == requested
)) {
409 avc_cache_stats_incr(hits
);
414 avc_cache_stats_incr(misses
);
419 static int avc_latest_notif_update(int seqno
, int is_insert
)
422 static DEFINE_SPINLOCK(notif_lock
);
425 spin_lock_irqsave(¬if_lock
, flag
);
427 if (seqno
< avc_cache
.latest_notif
) {
428 printk(KERN_WARNING
"avc: seqno %d < latest_notif %d\n",
429 seqno
, avc_cache
.latest_notif
);
433 if (seqno
> avc_cache
.latest_notif
)
434 avc_cache
.latest_notif
= seqno
;
436 spin_unlock_irqrestore(¬if_lock
, flag
);
442 * avc_insert - Insert an AVC entry.
443 * @ssid: source security identifier
444 * @tsid: target security identifier
445 * @tclass: target security class
448 * Insert an AVC entry for the SID pair
449 * (@ssid, @tsid) and class @tclass.
450 * The access vectors and the sequence number are
451 * normally provided by the security server in
452 * response to a security_compute_av() call. If the
453 * sequence number @ae->avd.seqno is not less than the latest
454 * revocation notification, then the function copies
455 * the access vectors into a cache entry, returns
456 * avc_node inserted. Otherwise, this function returns NULL.
458 static struct avc_node
*avc_insert(u32 ssid
, u32 tsid
, u16 tclass
, struct avc_entry
*ae
)
460 struct avc_node
*pos
, *node
= NULL
;
464 if (avc_latest_notif_update(ae
->avd
.seqno
, 1))
467 node
= avc_alloc_node();
469 hvalue
= avc_hash(ssid
, tsid
, tclass
);
470 avc_node_populate(node
, ssid
, tsid
, tclass
, ae
);
472 spin_lock_irqsave(&avc_cache
.slots_lock
[hvalue
], flag
);
473 list_for_each_entry(pos
, &avc_cache
.slots
[hvalue
], list
) {
474 if (pos
->ae
.ssid
== ssid
&&
475 pos
->ae
.tsid
== tsid
&&
476 pos
->ae
.tclass
== tclass
) {
477 avc_node_replace(node
, pos
);
481 list_add_rcu(&node
->list
, &avc_cache
.slots
[hvalue
]);
483 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flag
);
489 static inline void avc_print_ipv6_addr(struct audit_buffer
*ab
,
490 struct in6_addr
*addr
, __be16 port
,
491 char *name1
, char *name2
)
493 if (!ipv6_addr_any(addr
))
494 audit_log_format(ab
, " %s=" NIP6_FMT
, name1
, NIP6(*addr
));
496 audit_log_format(ab
, " %s=%d", name2
, ntohs(port
));
499 static inline void avc_print_ipv4_addr(struct audit_buffer
*ab
, __be32 addr
,
500 __be16 port
, char *name1
, char *name2
)
503 audit_log_format(ab
, " %s=" NIPQUAD_FMT
, name1
, NIPQUAD(addr
));
505 audit_log_format(ab
, " %s=%d", name2
, ntohs(port
));
509 * avc_audit - Audit the granting or denial of permissions.
510 * @ssid: source security identifier
511 * @tsid: target security identifier
512 * @tclass: target security class
513 * @requested: requested permissions
514 * @avd: access vector decisions
515 * @result: result from avc_has_perm_noaudit
516 * @a: auxiliary audit data
518 * Audit the granting or denial of permissions in accordance
519 * with the policy. This function is typically called by
520 * avc_has_perm() after a permission check, but can also be
521 * called directly by callers who use avc_has_perm_noaudit()
522 * in order to separate the permission check from the auditing.
523 * For example, this separation is useful when the permission check must
524 * be performed under a lock, to allow the lock to be released
525 * before calling the auditing code.
527 void avc_audit(u32 ssid
, u32 tsid
,
528 u16 tclass
, u32 requested
,
529 struct av_decision
*avd
, int result
, struct avc_audit_data
*a
)
531 struct task_struct
*tsk
= current
;
532 struct inode
*inode
= NULL
;
534 struct audit_buffer
*ab
;
536 denied
= requested
& ~avd
->allowed
;
539 if (!(audited
& avd
->auditdeny
))
542 audited
= denied
= requested
;
545 if (!(audited
& avd
->auditallow
))
549 ab
= audit_log_start(current
->audit_context
, GFP_ATOMIC
, AUDIT_AVC
);
551 return; /* audit_panic has been called */
552 audit_log_format(ab
, "avc: %s ", denied
? "denied" : "granted");
553 avc_dump_av(ab
, tclass
,audited
);
554 audit_log_format(ab
, " for ");
557 if (tsk
&& tsk
->pid
) {
558 audit_log_format(ab
, " pid=%d comm=", tsk
->pid
);
559 audit_log_untrustedstring(ab
, tsk
->comm
);
563 case AVC_AUDIT_DATA_IPC
:
564 audit_log_format(ab
, " key=%d", a
->u
.ipc_id
);
566 case AVC_AUDIT_DATA_CAP
:
567 audit_log_format(ab
, " capability=%d", a
->u
.cap
);
569 case AVC_AUDIT_DATA_FS
:
570 if (a
->u
.fs
.dentry
) {
571 struct dentry
*dentry
= a
->u
.fs
.dentry
;
573 audit_avc_path(dentry
, a
->u
.fs
.mnt
);
574 audit_log_format(ab
, " name=");
575 audit_log_untrustedstring(ab
, dentry
->d_name
.name
);
576 inode
= dentry
->d_inode
;
577 } else if (a
->u
.fs
.inode
) {
578 struct dentry
*dentry
;
579 inode
= a
->u
.fs
.inode
;
580 dentry
= d_find_alias(inode
);
582 audit_log_format(ab
, " name=");
583 audit_log_untrustedstring(ab
, dentry
->d_name
.name
);
588 audit_log_format(ab
, " dev=%s ino=%ld",
592 case AVC_AUDIT_DATA_NET
:
594 struct sock
*sk
= a
->u
.net
.sk
;
599 switch (sk
->sk_family
) {
601 struct inet_sock
*inet
= inet_sk(sk
);
603 avc_print_ipv4_addr(ab
, inet
->rcv_saddr
,
606 avc_print_ipv4_addr(ab
, inet
->daddr
,
612 struct inet_sock
*inet
= inet_sk(sk
);
613 struct ipv6_pinfo
*inet6
= inet6_sk(sk
);
615 avc_print_ipv6_addr(ab
, &inet6
->rcv_saddr
,
618 avc_print_ipv6_addr(ab
, &inet6
->daddr
,
626 audit_avc_path(u
->dentry
, u
->mnt
);
627 audit_log_format(ab
, " name=");
628 audit_log_untrustedstring(ab
, u
->dentry
->d_name
.name
);
633 len
= u
->addr
->len
-sizeof(short);
634 p
= &u
->addr
->name
->sun_path
[0];
635 audit_log_format(ab
, " path=");
637 audit_log_untrustedstring(ab
, p
);
639 audit_log_hex(ab
, p
, len
);
644 switch (a
->u
.net
.family
) {
646 avc_print_ipv4_addr(ab
, a
->u
.net
.v4info
.saddr
,
649 avc_print_ipv4_addr(ab
, a
->u
.net
.v4info
.daddr
,
654 avc_print_ipv6_addr(ab
, &a
->u
.net
.v6info
.saddr
,
657 avc_print_ipv6_addr(ab
, &a
->u
.net
.v6info
.daddr
,
663 audit_log_format(ab
, " netif=%s",
668 audit_log_format(ab
, " ");
669 avc_dump_query(ab
, ssid
, tsid
, tclass
);
674 * avc_add_callback - Register a callback for security events.
675 * @callback: callback function
676 * @events: security events
677 * @ssid: source security identifier or %SECSID_WILD
678 * @tsid: target security identifier or %SECSID_WILD
679 * @tclass: target security class
680 * @perms: permissions
682 * Register a callback function for events in the set @events
683 * related to the SID pair (@ssid, @tsid) and
684 * and the permissions @perms, interpreting
685 * @perms based on @tclass. Returns %0 on success or
686 * -%ENOMEM if insufficient memory exists to add the callback.
688 int avc_add_callback(int (*callback
)(u32 event
, u32 ssid
, u32 tsid
,
689 u16 tclass
, u32 perms
,
691 u32 events
, u32 ssid
, u32 tsid
,
692 u16 tclass
, u32 perms
)
694 struct avc_callback_node
*c
;
697 c
= kmalloc(sizeof(*c
), GFP_ATOMIC
);
703 c
->callback
= callback
;
708 c
->next
= avc_callbacks
;
714 static inline int avc_sidcmp(u32 x
, u32 y
)
716 return (x
== y
|| x
== SECSID_WILD
|| y
== SECSID_WILD
);
720 * avc_update_node Update an AVC entry
721 * @event : Updating event
722 * @perms : Permission mask bits
723 * @ssid,@tsid,@tclass : identifier of an AVC entry
725 * if a valid AVC entry doesn't exist,this function returns -ENOENT.
726 * if kmalloc() called internal returns NULL, this function returns -ENOMEM.
727 * otherwise, this function update the AVC entry. The original AVC-entry object
728 * will release later by RCU.
730 static int avc_update_node(u32 event
, u32 perms
, u32 ssid
, u32 tsid
, u16 tclass
)
734 struct avc_node
*pos
, *node
, *orig
= NULL
;
736 node
= avc_alloc_node();
742 /* Lock the target slot */
743 hvalue
= avc_hash(ssid
, tsid
, tclass
);
744 spin_lock_irqsave(&avc_cache
.slots_lock
[hvalue
], flag
);
746 list_for_each_entry(pos
, &avc_cache
.slots
[hvalue
], list
){
747 if ( ssid
==pos
->ae
.ssid
&&
748 tsid
==pos
->ae
.tsid
&&
749 tclass
==pos
->ae
.tclass
){
762 * Copy and replace original node.
765 avc_node_populate(node
, ssid
, tsid
, tclass
, &orig
->ae
);
768 case AVC_CALLBACK_GRANT
:
769 node
->ae
.avd
.allowed
|= perms
;
771 case AVC_CALLBACK_TRY_REVOKE
:
772 case AVC_CALLBACK_REVOKE
:
773 node
->ae
.avd
.allowed
&= ~perms
;
775 case AVC_CALLBACK_AUDITALLOW_ENABLE
:
776 node
->ae
.avd
.auditallow
|= perms
;
778 case AVC_CALLBACK_AUDITALLOW_DISABLE
:
779 node
->ae
.avd
.auditallow
&= ~perms
;
781 case AVC_CALLBACK_AUDITDENY_ENABLE
:
782 node
->ae
.avd
.auditdeny
|= perms
;
784 case AVC_CALLBACK_AUDITDENY_DISABLE
:
785 node
->ae
.avd
.auditdeny
&= ~perms
;
788 avc_node_replace(node
, orig
);
790 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flag
);
796 * avc_ss_reset - Flush the cache and revalidate migrated permissions.
797 * @seqno: policy sequence number
799 int avc_ss_reset(u32 seqno
)
801 struct avc_callback_node
*c
;
802 int i
, rc
= 0, tmprc
;
804 struct avc_node
*node
;
806 for (i
= 0; i
< AVC_CACHE_SLOTS
; i
++) {
807 spin_lock_irqsave(&avc_cache
.slots_lock
[i
], flag
);
808 list_for_each_entry(node
, &avc_cache
.slots
[i
], list
)
809 avc_node_delete(node
);
810 spin_unlock_irqrestore(&avc_cache
.slots_lock
[i
], flag
);
813 for (c
= avc_callbacks
; c
; c
= c
->next
) {
814 if (c
->events
& AVC_CALLBACK_RESET
) {
815 tmprc
= c
->callback(AVC_CALLBACK_RESET
,
817 /* save the first error encountered for the return
818 value and continue processing the callbacks */
824 avc_latest_notif_update(seqno
, 0);
829 * avc_has_perm_noaudit - Check permissions but perform no auditing.
830 * @ssid: source security identifier
831 * @tsid: target security identifier
832 * @tclass: target security class
833 * @requested: requested permissions, interpreted based on @tclass
834 * @avd: access vector decisions
836 * Check the AVC to determine whether the @requested permissions are granted
837 * for the SID pair (@ssid, @tsid), interpreting the permissions
838 * based on @tclass, and call the security server on a cache miss to obtain
839 * a new decision and add it to the cache. Return a copy of the decisions
840 * in @avd. Return %0 if all @requested permissions are granted,
841 * -%EACCES if any permissions are denied, or another -errno upon
842 * other errors. This function is typically called by avc_has_perm(),
843 * but may also be called directly to separate permission checking from
844 * auditing, e.g. in cases where a lock must be held for the check but
845 * should be released for the auditing.
847 int avc_has_perm_noaudit(u32 ssid
, u32 tsid
,
848 u16 tclass
, u32 requested
,
849 struct av_decision
*avd
)
851 struct avc_node
*node
;
852 struct avc_entry entry
, *p_ae
;
858 node
= avc_lookup(ssid
, tsid
, tclass
, requested
);
861 rc
= security_compute_av(ssid
,tsid
,tclass
,requested
,&entry
.avd
);
865 node
= avc_insert(ssid
,tsid
,tclass
,&entry
);
868 p_ae
= node
? &node
->ae
: &entry
;
871 memcpy(avd
, &p_ae
->avd
, sizeof(*avd
));
873 denied
= requested
& ~(p_ae
->avd
.allowed
);
875 if (!requested
|| denied
) {
876 if (selinux_enforcing
)
880 avc_update_node(AVC_CALLBACK_GRANT
,requested
,
890 * avc_has_perm - Check permissions and perform any appropriate auditing.
891 * @ssid: source security identifier
892 * @tsid: target security identifier
893 * @tclass: target security class
894 * @requested: requested permissions, interpreted based on @tclass
895 * @auditdata: auxiliary audit data
897 * Check the AVC to determine whether the @requested permissions are granted
898 * for the SID pair (@ssid, @tsid), interpreting the permissions
899 * based on @tclass, and call the security server on a cache miss to obtain
900 * a new decision and add it to the cache. Audit the granting or denial of
901 * permissions in accordance with the policy. Return %0 if all @requested
902 * permissions are granted, -%EACCES if any permissions are denied, or
903 * another -errno upon other errors.
905 int avc_has_perm(u32 ssid
, u32 tsid
, u16 tclass
,
906 u32 requested
, struct avc_audit_data
*auditdata
)
908 struct av_decision avd
;
911 rc
= avc_has_perm_noaudit(ssid
, tsid
, tclass
, requested
, &avd
);
912 avc_audit(ssid
, tsid
, tclass
, requested
, &avd
, rc
, auditdata
);