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) { .tclass = c,\
57 .common_pts = common_##i##_perm_to_string,\
59 #include "av_inherit.h"
63 const struct selinux_class_perm selinux_class_perm
= {
64 .av_perm_to_string
= av_perm_to_string
,
65 .av_pts_len
= ARRAY_SIZE(av_perm_to_string
),
66 .class_to_string
= class_to_string
,
67 .cts_len
= ARRAY_SIZE(class_to_string
),
68 .av_inherit
= av_inherit
,
69 .av_inherit_len
= ARRAY_SIZE(av_inherit
)
72 #define AVC_CACHE_SLOTS 512
73 #define AVC_DEF_CACHE_THRESHOLD 512
74 #define AVC_CACHE_RECLAIM 16
76 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
77 #define avc_cache_stats_incr(field) \
79 per_cpu(avc_cache_stats, get_cpu()).field++; \
83 #define avc_cache_stats_incr(field) do {} while (0)
90 struct av_decision avd
;
95 struct list_head list
;
96 struct rcu_head rhead
;
100 struct list_head slots
[AVC_CACHE_SLOTS
];
101 spinlock_t slots_lock
[AVC_CACHE_SLOTS
]; /* lock for writes */
102 atomic_t lru_hint
; /* LRU hint for reclaim scan */
103 atomic_t active_nodes
;
104 u32 latest_notif
; /* latest revocation notification */
107 struct avc_callback_node
{
108 int (*callback
) (u32 event
, u32 ssid
, u32 tsid
,
109 u16 tclass
, u32 perms
,
116 struct avc_callback_node
*next
;
119 /* Exported via selinufs */
120 unsigned int avc_cache_threshold
= AVC_DEF_CACHE_THRESHOLD
;
122 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
123 DEFINE_PER_CPU(struct avc_cache_stats
, avc_cache_stats
) = { 0 };
126 static struct avc_cache avc_cache
;
127 static struct avc_callback_node
*avc_callbacks
;
128 static struct kmem_cache
*avc_node_cachep
;
130 static inline int avc_hash(u32 ssid
, u32 tsid
, u16 tclass
)
132 return (ssid
^ (tsid
<<2) ^ (tclass
<<4)) & (AVC_CACHE_SLOTS
- 1);
136 * avc_dump_av - Display an access vector in human-readable form.
137 * @tclass: target security class
140 void avc_dump_av(struct audit_buffer
*ab
, u16 tclass
, u32 av
)
142 const char **common_pts
= NULL
;
147 audit_log_format(ab
, " null");
151 for (i
= 0; i
< ARRAY_SIZE(av_inherit
); i
++) {
152 if (av_inherit
[i
].tclass
== tclass
) {
153 common_pts
= av_inherit
[i
].common_pts
;
154 common_base
= av_inherit
[i
].common_base
;
159 audit_log_format(ab
, " {");
162 while (perm
< common_base
) {
164 audit_log_format(ab
, " %s", common_pts
[i
]);
171 while (i
< sizeof(av
) * 8) {
173 for (i2
= 0; i2
< ARRAY_SIZE(av_perm_to_string
); i2
++) {
174 if ((av_perm_to_string
[i2
].tclass
== tclass
) &&
175 (av_perm_to_string
[i2
].value
== perm
))
178 if (i2
< ARRAY_SIZE(av_perm_to_string
)) {
179 audit_log_format(ab
, " %s",
180 av_perm_to_string
[i2
].name
);
189 audit_log_format(ab
, " 0x%x", av
);
191 audit_log_format(ab
, " }");
195 * avc_dump_query - Display a SID pair and a class in human-readable form.
196 * @ssid: source security identifier
197 * @tsid: target security identifier
198 * @tclass: target security class
200 static void avc_dump_query(struct audit_buffer
*ab
, u32 ssid
, u32 tsid
, u16 tclass
)
206 rc
= security_sid_to_context(ssid
, &scontext
, &scontext_len
);
208 audit_log_format(ab
, "ssid=%d", ssid
);
210 audit_log_format(ab
, "scontext=%s", scontext
);
214 rc
= security_sid_to_context(tsid
, &scontext
, &scontext_len
);
216 audit_log_format(ab
, " tsid=%d", tsid
);
218 audit_log_format(ab
, " tcontext=%s", scontext
);
222 BUG_ON(tclass
>= ARRAY_SIZE(class_to_string
) || !class_to_string
[tclass
]);
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
);
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
))
317 list_for_each_entry(node
, &avc_cache
.slots
[hvalue
], list
) {
318 avc_node_delete(node
);
319 avc_cache_stats_incr(reclaims
);
321 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_zalloc(avc_node_cachep
, GFP_ATOMIC
);
342 INIT_RCU_HEAD(&node
->rhead
);
343 INIT_LIST_HEAD(&node
->list
);
344 avc_cache_stats_incr(allocations
);
346 if (atomic_inc_return(&avc_cache
.active_nodes
) > avc_cache_threshold
)
353 static void avc_node_populate(struct avc_node
*node
, u32 ssid
, u32 tsid
, u16 tclass
, struct av_decision
*avd
)
355 node
->ae
.ssid
= ssid
;
356 node
->ae
.tsid
= tsid
;
357 node
->ae
.tclass
= tclass
;
358 memcpy(&node
->ae
.avd
, avd
, sizeof(node
->ae
.avd
));
361 static inline struct avc_node
*avc_search_node(u32 ssid
, u32 tsid
, u16 tclass
)
363 struct avc_node
*node
, *ret
= NULL
;
366 hvalue
= avc_hash(ssid
, tsid
, tclass
);
367 list_for_each_entry_rcu(node
, &avc_cache
.slots
[hvalue
], list
) {
368 if (ssid
== node
->ae
.ssid
&&
369 tclass
== node
->ae
.tclass
&&
370 tsid
== node
->ae
.tsid
) {
380 * avc_lookup - Look up an AVC entry.
381 * @ssid: source security identifier
382 * @tsid: target security identifier
383 * @tclass: target security class
385 * Look up an AVC entry that is valid for the
386 * (@ssid, @tsid), interpreting the permissions
387 * based on @tclass. If a valid AVC entry exists,
388 * then this function return the avc_node.
389 * Otherwise, this function returns NULL.
391 static struct avc_node
*avc_lookup(u32 ssid
, u32 tsid
, u16 tclass
)
393 struct avc_node
*node
;
395 avc_cache_stats_incr(lookups
);
396 node
= avc_search_node(ssid
, tsid
, tclass
);
399 avc_cache_stats_incr(hits
);
401 avc_cache_stats_incr(misses
);
406 static int avc_latest_notif_update(int seqno
, int is_insert
)
409 static DEFINE_SPINLOCK(notif_lock
);
412 spin_lock_irqsave(¬if_lock
, flag
);
414 if (seqno
< avc_cache
.latest_notif
) {
415 printk(KERN_WARNING
"SELinux: avc: seqno %d < latest_notif %d\n",
416 seqno
, avc_cache
.latest_notif
);
420 if (seqno
> avc_cache
.latest_notif
)
421 avc_cache
.latest_notif
= seqno
;
423 spin_unlock_irqrestore(¬if_lock
, flag
);
429 * avc_insert - Insert an AVC entry.
430 * @ssid: source security identifier
431 * @tsid: target security identifier
432 * @tclass: target security class
433 * @avd: resulting av decision
435 * Insert an AVC entry for the SID pair
436 * (@ssid, @tsid) and class @tclass.
437 * The access vectors and the sequence number are
438 * normally provided by the security server in
439 * response to a security_compute_av() call. If the
440 * sequence number @avd->seqno is not less than the latest
441 * revocation notification, then the function copies
442 * the access vectors into a cache entry, returns
443 * avc_node inserted. Otherwise, this function returns NULL.
445 static struct avc_node
*avc_insert(u32 ssid
, u32 tsid
, u16 tclass
, struct av_decision
*avd
)
447 struct avc_node
*pos
, *node
= NULL
;
451 if (avc_latest_notif_update(avd
->seqno
, 1))
454 node
= avc_alloc_node();
456 hvalue
= avc_hash(ssid
, tsid
, tclass
);
457 avc_node_populate(node
, ssid
, tsid
, tclass
, avd
);
459 spin_lock_irqsave(&avc_cache
.slots_lock
[hvalue
], flag
);
460 list_for_each_entry(pos
, &avc_cache
.slots
[hvalue
], list
) {
461 if (pos
->ae
.ssid
== ssid
&&
462 pos
->ae
.tsid
== tsid
&&
463 pos
->ae
.tclass
== tclass
) {
464 avc_node_replace(node
, pos
);
468 list_add_rcu(&node
->list
, &avc_cache
.slots
[hvalue
]);
470 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flag
);
476 static inline void avc_print_ipv6_addr(struct audit_buffer
*ab
,
477 struct in6_addr
*addr
, __be16 port
,
478 char *name1
, char *name2
)
480 if (!ipv6_addr_any(addr
))
481 audit_log_format(ab
, " %s=%pI6", name1
, addr
);
483 audit_log_format(ab
, " %s=%d", name2
, ntohs(port
));
486 static inline void avc_print_ipv4_addr(struct audit_buffer
*ab
, __be32 addr
,
487 __be16 port
, char *name1
, char *name2
)
490 audit_log_format(ab
, " %s=%pI4", name1
, &addr
);
492 audit_log_format(ab
, " %s=%d", name2
, ntohs(port
));
496 * avc_audit - Audit the granting or denial of permissions.
497 * @ssid: source security identifier
498 * @tsid: target security identifier
499 * @tclass: target security class
500 * @requested: requested permissions
501 * @avd: access vector decisions
502 * @result: result from avc_has_perm_noaudit
503 * @a: auxiliary audit data
505 * Audit the granting or denial of permissions in accordance
506 * with the policy. This function is typically called by
507 * avc_has_perm() after a permission check, but can also be
508 * called directly by callers who use avc_has_perm_noaudit()
509 * in order to separate the permission check from the auditing.
510 * For example, this separation is useful when the permission check must
511 * be performed under a lock, to allow the lock to be released
512 * before calling the auditing code.
514 void avc_audit(u32 ssid
, u32 tsid
,
515 u16 tclass
, u32 requested
,
516 struct av_decision
*avd
, int result
, struct avc_audit_data
*a
)
518 struct task_struct
*tsk
= current
;
519 struct inode
*inode
= NULL
;
521 struct audit_buffer
*ab
;
523 denied
= requested
& ~avd
->allowed
;
526 if (!(audited
& avd
->auditdeny
))
529 audited
= denied
= requested
;
532 if (!(audited
& avd
->auditallow
))
536 ab
= audit_log_start(current
->audit_context
, GFP_ATOMIC
, AUDIT_AVC
);
538 return; /* audit_panic has been called */
539 audit_log_format(ab
, "avc: %s ", denied
? "denied" : "granted");
540 avc_dump_av(ab
, tclass
, audited
);
541 audit_log_format(ab
, " for ");
544 if (tsk
&& tsk
->pid
) {
545 audit_log_format(ab
, " pid=%d comm=", tsk
->pid
);
546 audit_log_untrustedstring(ab
, tsk
->comm
);
550 case AVC_AUDIT_DATA_IPC
:
551 audit_log_format(ab
, " key=%d", a
->u
.ipc_id
);
553 case AVC_AUDIT_DATA_CAP
:
554 audit_log_format(ab
, " capability=%d", a
->u
.cap
);
556 case AVC_AUDIT_DATA_FS
:
557 if (a
->u
.fs
.path
.dentry
) {
558 struct dentry
*dentry
= a
->u
.fs
.path
.dentry
;
559 if (a
->u
.fs
.path
.mnt
) {
560 audit_log_d_path(ab
, "path=",
563 audit_log_format(ab
, " name=");
564 audit_log_untrustedstring(ab
, dentry
->d_name
.name
);
566 inode
= dentry
->d_inode
;
567 } else if (a
->u
.fs
.inode
) {
568 struct dentry
*dentry
;
569 inode
= a
->u
.fs
.inode
;
570 dentry
= d_find_alias(inode
);
572 audit_log_format(ab
, " name=");
573 audit_log_untrustedstring(ab
, dentry
->d_name
.name
);
578 audit_log_format(ab
, " dev=%s ino=%lu",
582 case AVC_AUDIT_DATA_NET
:
584 struct sock
*sk
= a
->u
.net
.sk
;
589 switch (sk
->sk_family
) {
591 struct inet_sock
*inet
= inet_sk(sk
);
593 avc_print_ipv4_addr(ab
, inet
->rcv_saddr
,
596 avc_print_ipv4_addr(ab
, inet
->daddr
,
602 struct inet_sock
*inet
= inet_sk(sk
);
603 struct ipv6_pinfo
*inet6
= inet6_sk(sk
);
605 avc_print_ipv6_addr(ab
, &inet6
->rcv_saddr
,
608 avc_print_ipv6_addr(ab
, &inet6
->daddr
,
620 audit_log_d_path(ab
, "path=",
626 len
= u
->addr
->len
-sizeof(short);
627 p
= &u
->addr
->name
->sun_path
[0];
628 audit_log_format(ab
, " path=");
630 audit_log_untrustedstring(ab
, p
);
632 audit_log_n_hex(ab
, p
, len
);
637 switch (a
->u
.net
.family
) {
639 avc_print_ipv4_addr(ab
, a
->u
.net
.v4info
.saddr
,
642 avc_print_ipv4_addr(ab
, a
->u
.net
.v4info
.daddr
,
647 avc_print_ipv6_addr(ab
, &a
->u
.net
.v6info
.saddr
,
650 avc_print_ipv6_addr(ab
, &a
->u
.net
.v6info
.daddr
,
655 if (a
->u
.net
.netif
> 0) {
656 struct net_device
*dev
;
658 /* NOTE: we always use init's namespace */
659 dev
= dev_get_by_index(&init_net
,
662 audit_log_format(ab
, " netif=%s",
670 audit_log_format(ab
, " ");
671 avc_dump_query(ab
, ssid
, tsid
, tclass
);
676 * avc_add_callback - Register a callback for security events.
677 * @callback: callback function
678 * @events: security events
679 * @ssid: source security identifier or %SECSID_WILD
680 * @tsid: target security identifier or %SECSID_WILD
681 * @tclass: target security class
682 * @perms: permissions
684 * Register a callback function for events in the set @events
685 * related to the SID pair (@ssid, @tsid) and
686 * and the permissions @perms, interpreting
687 * @perms based on @tclass. Returns %0 on success or
688 * -%ENOMEM if insufficient memory exists to add the callback.
690 int avc_add_callback(int (*callback
)(u32 event
, u32 ssid
, u32 tsid
,
691 u16 tclass
, u32 perms
,
693 u32 events
, u32 ssid
, u32 tsid
,
694 u16 tclass
, u32 perms
)
696 struct avc_callback_node
*c
;
699 c
= kmalloc(sizeof(*c
), GFP_ATOMIC
);
705 c
->callback
= callback
;
710 c
->next
= avc_callbacks
;
716 static inline int avc_sidcmp(u32 x
, u32 y
)
718 return (x
== y
|| x
== SECSID_WILD
|| y
== SECSID_WILD
);
722 * avc_update_node Update an AVC entry
723 * @event : Updating event
724 * @perms : Permission mask bits
725 * @ssid,@tsid,@tclass : identifier of an AVC entry
726 * @seqno : sequence number when decision was made
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
,
738 struct avc_node
*pos
, *node
, *orig
= NULL
;
740 node
= avc_alloc_node();
746 /* Lock the target slot */
747 hvalue
= avc_hash(ssid
, tsid
, tclass
);
748 spin_lock_irqsave(&avc_cache
.slots_lock
[hvalue
], flag
);
750 list_for_each_entry(pos
, &avc_cache
.slots
[hvalue
], list
) {
751 if (ssid
== pos
->ae
.ssid
&&
752 tsid
== pos
->ae
.tsid
&&
753 tclass
== pos
->ae
.tclass
&&
754 seqno
== pos
->ae
.avd
.seqno
){
767 * Copy and replace original node.
770 avc_node_populate(node
, ssid
, tsid
, tclass
, &orig
->ae
.avd
);
773 case AVC_CALLBACK_GRANT
:
774 node
->ae
.avd
.allowed
|= perms
;
776 case AVC_CALLBACK_TRY_REVOKE
:
777 case AVC_CALLBACK_REVOKE
:
778 node
->ae
.avd
.allowed
&= ~perms
;
780 case AVC_CALLBACK_AUDITALLOW_ENABLE
:
781 node
->ae
.avd
.auditallow
|= perms
;
783 case AVC_CALLBACK_AUDITALLOW_DISABLE
:
784 node
->ae
.avd
.auditallow
&= ~perms
;
786 case AVC_CALLBACK_AUDITDENY_ENABLE
:
787 node
->ae
.avd
.auditdeny
|= perms
;
789 case AVC_CALLBACK_AUDITDENY_DISABLE
:
790 node
->ae
.avd
.auditdeny
&= ~perms
;
793 avc_node_replace(node
, orig
);
795 spin_unlock_irqrestore(&avc_cache
.slots_lock
[hvalue
], flag
);
801 * avc_ss_reset - Flush the cache and revalidate migrated permissions.
802 * @seqno: policy sequence number
804 int avc_ss_reset(u32 seqno
)
806 struct avc_callback_node
*c
;
807 int i
, rc
= 0, tmprc
;
809 struct avc_node
*node
;
811 for (i
= 0; i
< AVC_CACHE_SLOTS
; i
++) {
812 spin_lock_irqsave(&avc_cache
.slots_lock
[i
], flag
);
814 * With preemptable RCU, the outer spinlock does not
815 * prevent RCU grace periods from ending.
818 list_for_each_entry(node
, &avc_cache
.slots
[i
], list
)
819 avc_node_delete(node
);
821 spin_unlock_irqrestore(&avc_cache
.slots_lock
[i
], flag
);
824 for (c
= avc_callbacks
; c
; c
= c
->next
) {
825 if (c
->events
& AVC_CALLBACK_RESET
) {
826 tmprc
= c
->callback(AVC_CALLBACK_RESET
,
828 /* save the first error encountered for the return
829 value and continue processing the callbacks */
835 avc_latest_notif_update(seqno
, 0);
840 * avc_has_perm_noaudit - Check permissions but perform no auditing.
841 * @ssid: source security identifier
842 * @tsid: target security identifier
843 * @tclass: target security class
844 * @requested: requested permissions, interpreted based on @tclass
845 * @flags: AVC_STRICT or 0
846 * @avd: access vector decisions
848 * Check the AVC to determine whether the @requested permissions are granted
849 * for the SID pair (@ssid, @tsid), interpreting the permissions
850 * based on @tclass, and call the security server on a cache miss to obtain
851 * a new decision and add it to the cache. Return a copy of the decisions
852 * in @avd. Return %0 if all @requested permissions are granted,
853 * -%EACCES if any permissions are denied, or another -errno upon
854 * other errors. This function is typically called by avc_has_perm(),
855 * but may also be called directly to separate permission checking from
856 * auditing, e.g. in cases where a lock must be held for the check but
857 * should be released for the auditing.
859 int avc_has_perm_noaudit(u32 ssid
, u32 tsid
,
860 u16 tclass
, u32 requested
,
862 struct av_decision
*in_avd
)
864 struct avc_node
*node
;
865 struct av_decision avd_entry
, *avd
;
873 node
= avc_lookup(ssid
, tsid
, tclass
);
882 rc
= security_compute_av(ssid
, tsid
, tclass
, requested
, avd
);
886 node
= avc_insert(ssid
, tsid
, tclass
, avd
);
889 memcpy(in_avd
, &node
->ae
.avd
, sizeof(*in_avd
));
893 denied
= requested
& ~(avd
->allowed
);
896 if (flags
& AVC_STRICT
)
898 else if (!selinux_enforcing
|| security_permissive_sid(ssid
))
899 avc_update_node(AVC_CALLBACK_GRANT
, requested
, ssid
,
900 tsid
, tclass
, avd
->seqno
);
911 * avc_has_perm - Check permissions and perform any appropriate auditing.
912 * @ssid: source security identifier
913 * @tsid: target security identifier
914 * @tclass: target security class
915 * @requested: requested permissions, interpreted based on @tclass
916 * @auditdata: auxiliary audit data
918 * Check the AVC to determine whether the @requested permissions are granted
919 * for the SID pair (@ssid, @tsid), interpreting the permissions
920 * based on @tclass, and call the security server on a cache miss to obtain
921 * a new decision and add it to the cache. Audit the granting or denial of
922 * permissions in accordance with the policy. Return %0 if all @requested
923 * permissions are granted, -%EACCES if any permissions are denied, or
924 * another -errno upon other errors.
926 int avc_has_perm(u32 ssid
, u32 tsid
, u16 tclass
,
927 u32 requested
, struct avc_audit_data
*auditdata
)
929 struct av_decision avd
;
932 rc
= avc_has_perm_noaudit(ssid
, tsid
, tclass
, requested
, 0, &avd
);
933 avc_audit(ssid
, tsid
, tclass
, requested
, &avd
, rc
, auditdata
);
937 u32
avc_policy_seqno(void)
939 return avc_cache
.latest_notif
;