1 /* audit.c -- Auditing support
2 * Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
3 * System-call specific features have moved to auditsc.c
5 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
24 * Goals: 1) Integrate fully with SELinux.
25 * 2) Minimal run-time overhead:
26 * a) Minimal when syscall auditing is disabled (audit_enable=0).
27 * b) Small when syscall auditing is enabled and no audit record
28 * is generated (defer as much work as possible to record
30 * i) context is allocated,
31 * ii) names from getname are stored without a copy, and
32 * iii) inode information stored from path_lookup.
33 * 3) Ability to disable syscall auditing at boot time (audit=0).
34 * 4) Usable by other parts of the kernel (if audit_log* is called,
35 * then a syscall record will be generated automatically for the
37 * 5) Netlink interface to user-space.
38 * 6) Support low-overhead kernel-based filtering to minimize the
39 * information that must be passed to user-space.
41 * Example user-space utilities: http://people.redhat.com/sgrubb/audit/
44 #include <linux/init.h>
45 #include <asm/atomic.h>
46 #include <asm/types.h>
48 #include <linux/module.h>
50 #include <linux/audit.h>
53 #include <linux/skbuff.h>
54 #include <linux/netlink.h>
56 /* No auditing will take place until audit_initialized != 0.
57 * (Initialization happens after skb_init is called.) */
58 static int audit_initialized
;
60 /* No syscall auditing will take place unless audit_enabled != 0. */
63 /* Default state when kernel boots without any parameters. */
64 static int audit_default
;
66 /* If auditing cannot proceed, audit_failure selects what happens. */
67 static int audit_failure
= AUDIT_FAIL_PRINTK
;
69 /* If audit records are to be written to the netlink socket, audit_pid
70 * contains the (non-zero) pid. */
73 /* If audit_limit is non-zero, limit the rate of sending audit records
74 * to that number per second. This prevents DoS attacks, but results in
75 * audit records being dropped. */
76 static int audit_rate_limit
;
78 /* Number of outstanding audit_buffers allowed. */
79 static int audit_backlog_limit
= 64;
80 static atomic_t audit_backlog
= ATOMIC_INIT(0);
82 /* The identity of the user shutting down the audit system. */
83 uid_t audit_sig_uid
= -1;
84 pid_t audit_sig_pid
= -1;
86 /* Records can be lost in several ways:
87 0) [suppressed in audit_alloc]
88 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
89 2) out of memory in audit_log_move [alloc_skb]
90 3) suppressed due to audit_rate_limit
91 4) suppressed due to audit_backlog_limit
93 static atomic_t audit_lost
= ATOMIC_INIT(0);
95 /* The netlink socket. */
96 static struct sock
*audit_sock
;
98 /* There are two lists of audit buffers. The txlist contains audit
99 * buffers that cannot be sent immediately to the netlink device because
100 * we are in an irq context (these are sent later in a tasklet).
102 * The second list is a list of pre-allocated audit buffers (if more
103 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
104 * being placed on the freelist). */
105 static DEFINE_SPINLOCK(audit_txlist_lock
);
106 static DEFINE_SPINLOCK(audit_freelist_lock
);
107 static int audit_freelist_count
= 0;
108 static LIST_HEAD(audit_txlist
);
109 static LIST_HEAD(audit_freelist
);
111 /* There are three lists of rules -- one to search at task creation
112 * time, one to search at syscall entry time, and another to search at
113 * syscall exit time. */
114 static LIST_HEAD(audit_tsklist
);
115 static LIST_HEAD(audit_entlist
);
116 static LIST_HEAD(audit_extlist
);
118 /* The netlink socket is only to be read by 1 CPU, which lets us assume
119 * that list additions and deletions never happen simultaneiously in
121 static DECLARE_MUTEX(audit_netlink_sem
);
123 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
124 * audit records. Since printk uses a 1024 byte buffer, this buffer
125 * should be at least that large. */
126 #define AUDIT_BUFSIZ 1024
128 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
129 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
130 #define AUDIT_MAXFREE (2*NR_CPUS)
132 /* The audit_buffer is used when formatting an audit record. The caller
133 * locks briefly to get the record off the freelist or to allocate the
134 * buffer, and locks briefly to send the buffer to the netlink layer or
135 * to place it on a transmit queue. Multiple audit_buffers can be in
136 * use simultaneously. */
137 struct audit_buffer
{
138 struct list_head list
;
139 struct sk_buff
*skb
; /* formatted skb ready to send */
140 struct audit_context
*ctx
; /* NULL or associated context */
143 void audit_set_type(struct audit_buffer
*ab
, int type
)
145 struct nlmsghdr
*nlh
= (struct nlmsghdr
*)ab
->skb
->data
;
146 nlh
->nlmsg_type
= type
;
149 static void audit_set_pid(struct audit_buffer
*ab
, pid_t pid
)
151 struct nlmsghdr
*nlh
= (struct nlmsghdr
*)ab
->skb
->data
;
152 nlh
->nlmsg_pid
= pid
;
156 struct list_head list
;
157 struct audit_rule rule
;
160 static void audit_log_end_irq(struct audit_buffer
*ab
);
161 static void audit_log_end_fast(struct audit_buffer
*ab
);
163 static void audit_panic(const char *message
)
165 switch (audit_failure
)
167 case AUDIT_FAIL_SILENT
:
169 case AUDIT_FAIL_PRINTK
:
170 printk(KERN_ERR
"audit: %s\n", message
);
172 case AUDIT_FAIL_PANIC
:
173 panic("audit: %s\n", message
);
178 static inline int audit_rate_check(void)
180 static unsigned long last_check
= 0;
181 static int messages
= 0;
182 static DEFINE_SPINLOCK(lock
);
185 unsigned long elapsed
;
188 if (!audit_rate_limit
) return 1;
190 spin_lock_irqsave(&lock
, flags
);
191 if (++messages
< audit_rate_limit
) {
195 elapsed
= now
- last_check
;
202 spin_unlock_irqrestore(&lock
, flags
);
207 /* Emit at least 1 message per second, even if audit_rate_check is
209 void audit_log_lost(const char *message
)
211 static unsigned long last_msg
= 0;
212 static DEFINE_SPINLOCK(lock
);
217 atomic_inc(&audit_lost
);
219 print
= (audit_failure
== AUDIT_FAIL_PANIC
|| !audit_rate_limit
);
222 spin_lock_irqsave(&lock
, flags
);
224 if (now
- last_msg
> HZ
) {
228 spin_unlock_irqrestore(&lock
, flags
);
233 "audit: audit_lost=%d audit_backlog=%d"
234 " audit_rate_limit=%d audit_backlog_limit=%d\n",
235 atomic_read(&audit_lost
),
236 atomic_read(&audit_backlog
),
238 audit_backlog_limit
);
239 audit_panic(message
);
244 static int audit_set_rate_limit(int limit
, uid_t loginuid
)
246 int old
= audit_rate_limit
;
247 audit_rate_limit
= limit
;
248 audit_log(NULL
, "audit_rate_limit=%d old=%d by auid %u",
249 audit_rate_limit
, old
, loginuid
);
253 static int audit_set_backlog_limit(int limit
, uid_t loginuid
)
255 int old
= audit_backlog_limit
;
256 audit_backlog_limit
= limit
;
257 audit_log(NULL
, "audit_backlog_limit=%d old=%d by auid %u",
258 audit_backlog_limit
, old
, loginuid
);
262 static int audit_set_enabled(int state
, uid_t loginuid
)
264 int old
= audit_enabled
;
265 if (state
!= 0 && state
!= 1)
267 audit_enabled
= state
;
268 audit_log(NULL
, "audit_enabled=%d old=%d by auid %u",
269 audit_enabled
, old
, loginuid
);
273 static int audit_set_failure(int state
, uid_t loginuid
)
275 int old
= audit_failure
;
276 if (state
!= AUDIT_FAIL_SILENT
277 && state
!= AUDIT_FAIL_PRINTK
278 && state
!= AUDIT_FAIL_PANIC
)
280 audit_failure
= state
;
281 audit_log(NULL
, "audit_failure=%d old=%d by auid %u",
282 audit_failure
, old
, loginuid
);
287 void audit_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
288 void *payload
, int size
)
291 struct nlmsghdr
*nlh
;
292 int len
= NLMSG_SPACE(size
);
294 int flags
= multi
? NLM_F_MULTI
: 0;
295 int t
= done
? NLMSG_DONE
: type
;
297 skb
= alloc_skb(len
, GFP_KERNEL
);
301 nlh
= NLMSG_PUT(skb
, pid
, seq
, t
, len
- sizeof(*nlh
));
302 nlh
->nlmsg_flags
= flags
;
303 data
= NLMSG_DATA(nlh
);
304 memcpy(data
, payload
, size
);
305 netlink_unicast(audit_sock
, skb
, pid
, MSG_DONTWAIT
);
308 nlmsg_failure
: /* Used by NLMSG_PUT */
314 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
317 static int audit_netlink_ok(kernel_cap_t eff_cap
, u16 msg_type
)
327 case AUDIT_SIGNAL_INFO
:
328 if (!cap_raised(eff_cap
, CAP_AUDIT_CONTROL
))
332 if (!cap_raised(eff_cap
, CAP_AUDIT_WRITE
))
335 default: /* bad msg */
342 static int audit_receive_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
346 struct audit_status
*status_get
, status_set
;
348 struct audit_buffer
*ab
;
349 u16 msg_type
= nlh
->nlmsg_type
;
350 uid_t loginuid
; /* loginuid of sender */
351 struct audit_sig_info sig_data
;
353 err
= audit_netlink_ok(NETLINK_CB(skb
).eff_cap
, msg_type
);
357 pid
= NETLINK_CREDS(skb
)->pid
;
358 uid
= NETLINK_CREDS(skb
)->uid
;
359 loginuid
= NETLINK_CB(skb
).loginuid
;
360 seq
= nlh
->nlmsg_seq
;
361 data
= NLMSG_DATA(nlh
);
365 status_set
.enabled
= audit_enabled
;
366 status_set
.failure
= audit_failure
;
367 status_set
.pid
= audit_pid
;
368 status_set
.rate_limit
= audit_rate_limit
;
369 status_set
.backlog_limit
= audit_backlog_limit
;
370 status_set
.lost
= atomic_read(&audit_lost
);
371 status_set
.backlog
= atomic_read(&audit_backlog
);
372 audit_send_reply(NETLINK_CB(skb
).pid
, seq
, AUDIT_GET
, 0, 0,
373 &status_set
, sizeof(status_set
));
376 if (nlh
->nlmsg_len
< sizeof(struct audit_status
))
378 status_get
= (struct audit_status
*)data
;
379 if (status_get
->mask
& AUDIT_STATUS_ENABLED
) {
380 err
= audit_set_enabled(status_get
->enabled
, loginuid
);
381 if (err
< 0) return err
;
383 if (status_get
->mask
& AUDIT_STATUS_FAILURE
) {
384 err
= audit_set_failure(status_get
->failure
, loginuid
);
385 if (err
< 0) return err
;
387 if (status_get
->mask
& AUDIT_STATUS_PID
) {
389 audit_pid
= status_get
->pid
;
390 audit_log(NULL
, "audit_pid=%d old=%d by auid %u",
391 audit_pid
, old
, loginuid
);
393 if (status_get
->mask
& AUDIT_STATUS_RATE_LIMIT
)
394 audit_set_rate_limit(status_get
->rate_limit
, loginuid
);
395 if (status_get
->mask
& AUDIT_STATUS_BACKLOG_LIMIT
)
396 audit_set_backlog_limit(status_get
->backlog_limit
,
400 ab
= audit_log_start(NULL
);
402 break; /* audit_panic has been called */
404 "user pid=%d uid=%d length=%d loginuid=%u"
408 - ((char *)data
- (char *)nlh
)),
409 loginuid
, (char *)data
);
410 audit_set_type(ab
, AUDIT_USER
);
411 audit_set_pid(ab
, pid
);
416 if (nlh
->nlmsg_len
< sizeof(struct audit_rule
))
420 #ifdef CONFIG_AUDITSYSCALL
421 err
= audit_receive_filter(nlh
->nlmsg_type
, NETLINK_CB(skb
).pid
,
422 uid
, seq
, data
, loginuid
);
427 case AUDIT_SIGNAL_INFO
:
428 sig_data
.uid
= audit_sig_uid
;
429 sig_data
.pid
= audit_sig_pid
;
430 audit_send_reply(NETLINK_CB(skb
).pid
, seq
, AUDIT_SIGNAL_INFO
,
431 0, 0, &sig_data
, sizeof(sig_data
));
438 return err
< 0 ? err
: 0;
441 /* Get message from skb (based on rtnetlink_rcv_skb). Each message is
442 * processed by audit_receive_msg. Malformed skbs with wrong length are
443 * discarded silently. */
444 static void audit_receive_skb(struct sk_buff
*skb
)
447 struct nlmsghdr
*nlh
;
450 while (skb
->len
>= NLMSG_SPACE(0)) {
451 nlh
= (struct nlmsghdr
*)skb
->data
;
452 if (nlh
->nlmsg_len
< sizeof(*nlh
) || skb
->len
< nlh
->nlmsg_len
)
454 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
457 if ((err
= audit_receive_msg(skb
, nlh
))) {
458 netlink_ack(skb
, nlh
, err
);
459 } else if (nlh
->nlmsg_flags
& NLM_F_ACK
)
460 netlink_ack(skb
, nlh
, 0);
465 /* Receive messages from netlink socket. */
466 static void audit_receive(struct sock
*sk
, int length
)
471 down(&audit_netlink_sem
);
473 for (qlen
= skb_queue_len(&sk
->sk_receive_queue
); qlen
; qlen
--) {
474 skb
= skb_dequeue(&sk
->sk_receive_queue
);
475 audit_receive_skb(skb
);
478 up(&audit_netlink_sem
);
481 /* Grab skbuff from the audit_buffer and send to user space. */
482 static inline int audit_log_drain(struct audit_buffer
*ab
)
484 struct sk_buff
*skb
= ab
->skb
;
490 struct nlmsghdr
*nlh
= (struct nlmsghdr
*)skb
->data
;
491 nlh
->nlmsg_len
= skb
->len
;
492 skb_get(skb
); /* because netlink_* frees */
493 retval
= netlink_unicast(audit_sock
, skb
, audit_pid
,
496 if (retval
== -EAGAIN
&&
497 (atomic_read(&audit_backlog
)) < audit_backlog_limit
) {
498 audit_log_end_irq(ab
);
502 if (retval
== -ECONNREFUSED
) {
504 "audit: *NO* daemon at audit_pid=%d\n",
508 audit_log_lost("netlink socket too busy");
510 if (!audit_pid
) { /* No daemon */
511 int offset
= NLMSG_SPACE(0);
512 int len
= skb
->len
- offset
;
513 skb
->data
[offset
+ len
] = '\0';
514 printk(KERN_ERR
"%s\n", skb
->data
+ offset
);
520 /* Initialize audit support at boot time. */
521 static int __init
audit_init(void)
523 printk(KERN_INFO
"audit: initializing netlink socket (%s)\n",
524 audit_default
? "enabled" : "disabled");
525 audit_sock
= netlink_kernel_create(NETLINK_AUDIT
, audit_receive
);
527 audit_panic("cannot initialize netlink socket");
529 audit_initialized
= 1;
530 audit_enabled
= audit_default
;
531 audit_log(NULL
, "initialized");
536 /* Without CONFIG_NET, we have no skbuffs. For now, print what we have
538 static void audit_log_move(struct audit_buffer
*ab
)
540 printk(KERN_ERR
"%*.*s\n", ab
->len
, ab
->len
, ab
->tmp
);
544 static inline int audit_log_drain(struct audit_buffer
*ab
)
549 /* Initialize audit support at boot time. */
550 int __init
audit_init(void)
552 printk(KERN_INFO
"audit: initializing WITHOUT netlink support\n");
556 audit_initialized
= 1;
557 audit_enabled
= audit_default
;
558 audit_log(NULL
, "initialized");
563 __initcall(audit_init
);
565 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
566 static int __init
audit_enable(char *str
)
568 audit_default
= !!simple_strtol(str
, NULL
, 0);
569 printk(KERN_INFO
"audit: %s%s\n",
570 audit_default
? "enabled" : "disabled",
571 audit_initialized
? "" : " (after initialization)");
572 if (audit_initialized
)
573 audit_enabled
= audit_default
;
577 __setup("audit=", audit_enable
);
579 static void audit_buffer_free(struct audit_buffer
*ab
)
588 atomic_dec(&audit_backlog
);
589 spin_lock_irqsave(&audit_freelist_lock
, flags
);
590 if (++audit_freelist_count
> AUDIT_MAXFREE
)
593 list_add(&ab
->list
, &audit_freelist
);
594 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
597 static struct audit_buffer
* audit_buffer_alloc(struct audit_context
*ctx
,
601 struct audit_buffer
*ab
= NULL
;
602 struct nlmsghdr
*nlh
;
604 spin_lock_irqsave(&audit_freelist_lock
, flags
);
605 if (!list_empty(&audit_freelist
)) {
606 ab
= list_entry(audit_freelist
.next
,
607 struct audit_buffer
, list
);
609 --audit_freelist_count
;
611 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
614 ab
= kmalloc(sizeof(*ab
), gfp_mask
);
618 atomic_inc(&audit_backlog
);
620 ab
->skb
= alloc_skb(AUDIT_BUFSIZ
, gfp_mask
);
625 nlh
= (struct nlmsghdr
*)skb_put(ab
->skb
, NLMSG_SPACE(0));
626 nlh
->nlmsg_type
= AUDIT_KERNEL
;
627 nlh
->nlmsg_flags
= 0;
632 audit_buffer_free(ab
);
636 /* Obtain an audit buffer. This routine does locking to obtain the
637 * audit buffer, but then no locking is required for calls to
638 * audit_log_*format. If the tsk is a task that is currently in a
639 * syscall, then the syscall is marked as auditable and an audit record
640 * will be written at syscall exit. If there is no associated task, tsk
642 struct audit_buffer
*audit_log_start(struct audit_context
*ctx
)
644 struct audit_buffer
*ab
= NULL
;
648 if (!audit_initialized
)
651 if (audit_backlog_limit
652 && atomic_read(&audit_backlog
) > audit_backlog_limit
) {
653 if (audit_rate_check())
655 "audit: audit_backlog=%d > "
656 "audit_backlog_limit=%d\n",
657 atomic_read(&audit_backlog
),
658 audit_backlog_limit
);
659 audit_log_lost("backlog limit exceeded");
663 ab
= audit_buffer_alloc(ctx
, GFP_ATOMIC
);
665 audit_log_lost("out of memory in audit_log_start");
669 #ifdef CONFIG_AUDITSYSCALL
671 audit_get_stamp(ab
->ctx
, &t
, &serial
);
678 audit_log_format(ab
, "audit(%lu.%03lu:%u): ",
679 t
.tv_sec
, t
.tv_nsec
/1000000, serial
);
684 * audit_expand - expand skb in the audit buffer
687 * Returns 0 (no space) on failed expansion, or available space if
690 static inline int audit_expand(struct audit_buffer
*ab
)
692 struct sk_buff
*skb
= ab
->skb
;
693 int ret
= pskb_expand_head(skb
, skb_headroom(skb
), AUDIT_BUFSIZ
,
696 audit_log_lost("out of memory in audit_expand");
699 return skb_tailroom(skb
);
702 /* Format an audit message into the audit buffer. If there isn't enough
703 * room in the audit buffer, more room will be allocated and vsnprint
704 * will be called a second time. Currently, we assume that a printk
705 * can't format message larger than 1024 bytes, so we don't either. */
706 static void audit_log_vformat(struct audit_buffer
*ab
, const char *fmt
,
717 avail
= skb_tailroom(skb
);
719 avail
= audit_expand(ab
);
723 len
= vsnprintf(skb
->tail
, avail
, fmt
, args
);
725 /* The printk buffer is 1024 bytes long, so if we get
726 * here and AUDIT_BUFSIZ is at least 1024, then we can
727 * log everything that printk could have logged. */
728 avail
= audit_expand(ab
);
731 len
= vsnprintf(skb
->tail
, avail
, fmt
, args
);
733 skb_put(skb
, (len
< avail
) ? len
: avail
);
738 /* Format a message into the audit buffer. All the work is done in
739 * audit_log_vformat. */
740 void audit_log_format(struct audit_buffer
*ab
, const char *fmt
, ...)
747 audit_log_vformat(ab
, fmt
, args
);
751 void audit_log_hex(struct audit_buffer
*ab
, const unsigned char *buf
, size_t len
)
755 for (i
=0; i
<len
; i
++)
756 audit_log_format(ab
, "%02x", buf
[i
]);
759 void audit_log_untrustedstring(struct audit_buffer
*ab
, const char *string
)
761 const unsigned char *p
= string
;
764 if (*p
== '"' || *p
== ' ' || *p
< 0x20 || *p
> 0x7f) {
765 audit_log_hex(ab
, string
, strlen(string
));
770 audit_log_format(ab
, "\"%s\"", string
);
774 /* This is a helper-function to print the d_path without using a static
775 * buffer or allocating another buffer in addition to the one in
777 void audit_log_d_path(struct audit_buffer
*ab
, const char *prefix
,
778 struct dentry
*dentry
, struct vfsmount
*vfsmnt
)
781 struct sk_buff
*skb
= ab
->skb
;
785 audit_log_format(ab
, " %s", prefix
);
787 avail
= skb_tailroom(skb
);
788 p
= d_path(dentry
, vfsmnt
, skb
->tail
, avail
);
790 /* FIXME: can we save some information here? */
791 audit_log_format(ab
, "<toolong>");
793 /* path isn't at start of buffer */
794 len
= ((char *)skb
->tail
+ avail
- 1) - p
;
795 memmove(skb
->tail
, p
, len
);
800 /* Remove queued messages from the audit_txlist and send them to userspace. */
801 static void audit_tasklet_handler(unsigned long arg
)
804 struct audit_buffer
*ab
;
807 spin_lock_irqsave(&audit_txlist_lock
, flags
);
808 list_splice_init(&audit_txlist
, &list
);
809 spin_unlock_irqrestore(&audit_txlist_lock
, flags
);
811 while (!list_empty(&list
)) {
812 ab
= list_entry(list
.next
, struct audit_buffer
, list
);
814 audit_log_end_fast(ab
);
818 static DECLARE_TASKLET(audit_tasklet
, audit_tasklet_handler
, 0);
820 /* The netlink_* functions cannot be called inside an irq context, so
821 * the audit buffer is places on a queue and a tasklet is scheduled to
822 * remove them from the queue outside the irq context. May be called in
824 static void audit_log_end_irq(struct audit_buffer
*ab
)
830 spin_lock_irqsave(&audit_txlist_lock
, flags
);
831 list_add_tail(&ab
->list
, &audit_txlist
);
832 spin_unlock_irqrestore(&audit_txlist_lock
, flags
);
834 tasklet_schedule(&audit_tasklet
);
837 /* Send the message in the audit buffer directly to user space. May not
838 * be called in an irq context. */
839 static void audit_log_end_fast(struct audit_buffer
*ab
)
844 if (!audit_rate_check()) {
845 audit_log_lost("rate limit exceeded");
847 if (audit_log_drain(ab
))
850 audit_buffer_free(ab
);
853 /* Send or queue the message in the audit buffer, depending on the
854 * current context. (A convenience function that may be called in any
856 void audit_log_end(struct audit_buffer
*ab
)
859 audit_log_end_irq(ab
);
861 audit_log_end_fast(ab
);
864 /* Log an audit record. This is a convenience function that calls
865 * audit_log_start, audit_log_vformat, and audit_log_end. It may be
866 * called in any context. */
867 void audit_log(struct audit_context
*ctx
, const char *fmt
, ...)
869 struct audit_buffer
*ab
;
872 ab
= audit_log_start(ctx
);
875 audit_log_vformat(ab
, fmt
, args
);