mm-only debug patch...
[mmotm.git] / kernel / audit.c
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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 2003-2007 Red Hat Inc., Durham, North Carolina.
6 * All Rights Reserved.
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 Security Modules.
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
29 * generation time):
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
36 * current syscall).
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/types.h>
46 #include <asm/atomic.h>
47 #include <linux/mm.h>
48 #include <linux/module.h>
49 #include <linux/err.h>
50 #include <linux/kthread.h>
52 #include <linux/audit.h>
54 #include <net/sock.h>
55 #include <net/netlink.h>
56 #include <linux/skbuff.h>
57 #include <linux/netlink.h>
58 #include <linux/freezer.h>
59 #include <linux/tty.h>
61 #include "audit.h"
63 /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
64 * (Initialization happens after skb_init is called.) */
65 #define AUDIT_DISABLED -1
66 #define AUDIT_UNINITIALIZED 0
67 #define AUDIT_INITIALIZED 1
68 static int audit_initialized;
70 #define AUDIT_OFF 0
71 #define AUDIT_ON 1
72 #define AUDIT_LOCKED 2
73 int audit_enabled;
74 int audit_ever_enabled;
76 /* Default state when kernel boots without any parameters. */
77 static int audit_default;
79 /* If auditing cannot proceed, audit_failure selects what happens. */
80 static int audit_failure = AUDIT_FAIL_PRINTK;
83 * If audit records are to be written to the netlink socket, audit_pid
84 * contains the pid of the auditd process and audit_nlk_pid contains
85 * the pid to use to send netlink messages to that process.
87 int audit_pid;
88 static int audit_nlk_pid;
90 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
91 * to that number per second. This prevents DoS attacks, but results in
92 * audit records being dropped. */
93 static int audit_rate_limit;
95 /* Number of outstanding audit_buffers allowed. */
96 static int audit_backlog_limit = 64;
97 static int audit_backlog_wait_time = 60 * HZ;
98 static int audit_backlog_wait_overflow = 0;
100 /* The identity of the user shutting down the audit system. */
101 uid_t audit_sig_uid = -1;
102 pid_t audit_sig_pid = -1;
103 u32 audit_sig_sid = 0;
105 /* Records can be lost in several ways:
106 0) [suppressed in audit_alloc]
107 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
108 2) out of memory in audit_log_move [alloc_skb]
109 3) suppressed due to audit_rate_limit
110 4) suppressed due to audit_backlog_limit
112 static atomic_t audit_lost = ATOMIC_INIT(0);
114 /* The netlink socket. */
115 static struct sock *audit_sock;
117 /* Hash for inode-based rules */
118 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
120 /* The audit_freelist is a list of pre-allocated audit buffers (if more
121 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
122 * being placed on the freelist). */
123 static DEFINE_SPINLOCK(audit_freelist_lock);
124 static int audit_freelist_count;
125 static LIST_HEAD(audit_freelist);
127 static struct sk_buff_head audit_skb_queue;
128 /* queue of skbs to send to auditd when/if it comes back */
129 static struct sk_buff_head audit_skb_hold_queue;
130 static struct task_struct *kauditd_task;
131 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
132 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
134 /* Serialize requests from userspace. */
135 DEFINE_MUTEX(audit_cmd_mutex);
137 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
138 * audit records. Since printk uses a 1024 byte buffer, this buffer
139 * should be at least that large. */
140 #define AUDIT_BUFSIZ 1024
142 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
143 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
144 #define AUDIT_MAXFREE (2*NR_CPUS)
146 /* The audit_buffer is used when formatting an audit record. The caller
147 * locks briefly to get the record off the freelist or to allocate the
148 * buffer, and locks briefly to send the buffer to the netlink layer or
149 * to place it on a transmit queue. Multiple audit_buffers can be in
150 * use simultaneously. */
151 struct audit_buffer {
152 struct list_head list;
153 struct sk_buff *skb; /* formatted skb ready to send */
154 struct audit_context *ctx; /* NULL or associated context */
155 gfp_t gfp_mask;
158 struct audit_reply {
159 int pid;
160 struct sk_buff *skb;
163 static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
165 if (ab) {
166 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
167 nlh->nlmsg_pid = pid;
171 void audit_panic(const char *message)
173 switch (audit_failure)
175 case AUDIT_FAIL_SILENT:
176 break;
177 case AUDIT_FAIL_PRINTK:
178 if (printk_ratelimit())
179 printk(KERN_ERR "audit: %s\n", message);
180 break;
181 case AUDIT_FAIL_PANIC:
182 /* test audit_pid since printk is always losey, why bother? */
183 if (audit_pid)
184 panic("audit: %s\n", message);
185 break;
189 static inline int audit_rate_check(void)
191 static unsigned long last_check = 0;
192 static int messages = 0;
193 static DEFINE_SPINLOCK(lock);
194 unsigned long flags;
195 unsigned long now;
196 unsigned long elapsed;
197 int retval = 0;
199 if (!audit_rate_limit) return 1;
201 spin_lock_irqsave(&lock, flags);
202 if (++messages < audit_rate_limit) {
203 retval = 1;
204 } else {
205 now = jiffies;
206 elapsed = now - last_check;
207 if (elapsed > HZ) {
208 last_check = now;
209 messages = 0;
210 retval = 1;
213 spin_unlock_irqrestore(&lock, flags);
215 return retval;
219 * audit_log_lost - conditionally log lost audit message event
220 * @message: the message stating reason for lost audit message
222 * Emit at least 1 message per second, even if audit_rate_check is
223 * throttling.
224 * Always increment the lost messages counter.
226 void audit_log_lost(const char *message)
228 static unsigned long last_msg = 0;
229 static DEFINE_SPINLOCK(lock);
230 unsigned long flags;
231 unsigned long now;
232 int print;
234 atomic_inc(&audit_lost);
236 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
238 if (!print) {
239 spin_lock_irqsave(&lock, flags);
240 now = jiffies;
241 if (now - last_msg > HZ) {
242 print = 1;
243 last_msg = now;
245 spin_unlock_irqrestore(&lock, flags);
248 if (print) {
249 if (printk_ratelimit())
250 printk(KERN_WARNING
251 "audit: audit_lost=%d audit_rate_limit=%d "
252 "audit_backlog_limit=%d\n",
253 atomic_read(&audit_lost),
254 audit_rate_limit,
255 audit_backlog_limit);
256 audit_panic(message);
260 static int audit_log_config_change(char *function_name, int new, int old,
261 uid_t loginuid, u32 sessionid, u32 sid,
262 int allow_changes)
264 struct audit_buffer *ab;
265 int rc = 0;
267 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
268 audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new,
269 old, loginuid, sessionid);
270 if (sid) {
271 char *ctx = NULL;
272 u32 len;
274 rc = security_secid_to_secctx(sid, &ctx, &len);
275 if (rc) {
276 audit_log_format(ab, " sid=%u", sid);
277 allow_changes = 0; /* Something weird, deny request */
278 } else {
279 audit_log_format(ab, " subj=%s", ctx);
280 security_release_secctx(ctx, len);
283 audit_log_format(ab, " res=%d", allow_changes);
284 audit_log_end(ab);
285 return rc;
288 static int audit_do_config_change(char *function_name, int *to_change,
289 int new, uid_t loginuid, u32 sessionid,
290 u32 sid)
292 int allow_changes, rc = 0, old = *to_change;
294 /* check if we are locked */
295 if (audit_enabled == AUDIT_LOCKED)
296 allow_changes = 0;
297 else
298 allow_changes = 1;
300 if (audit_enabled != AUDIT_OFF) {
301 rc = audit_log_config_change(function_name, new, old, loginuid,
302 sessionid, sid, allow_changes);
303 if (rc)
304 allow_changes = 0;
307 /* If we are allowed, make the change */
308 if (allow_changes == 1)
309 *to_change = new;
310 /* Not allowed, update reason */
311 else if (rc == 0)
312 rc = -EPERM;
313 return rc;
316 static int audit_set_rate_limit(int limit, uid_t loginuid, u32 sessionid,
317 u32 sid)
319 return audit_do_config_change("audit_rate_limit", &audit_rate_limit,
320 limit, loginuid, sessionid, sid);
323 static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sessionid,
324 u32 sid)
326 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit,
327 limit, loginuid, sessionid, sid);
330 static int audit_set_enabled(int state, uid_t loginuid, u32 sessionid, u32 sid)
332 int rc;
333 if (state < AUDIT_OFF || state > AUDIT_LOCKED)
334 return -EINVAL;
336 rc = audit_do_config_change("audit_enabled", &audit_enabled, state,
337 loginuid, sessionid, sid);
339 if (!rc)
340 audit_ever_enabled |= !!state;
342 return rc;
345 static int audit_set_failure(int state, uid_t loginuid, u32 sessionid, u32 sid)
347 if (state != AUDIT_FAIL_SILENT
348 && state != AUDIT_FAIL_PRINTK
349 && state != AUDIT_FAIL_PANIC)
350 return -EINVAL;
352 return audit_do_config_change("audit_failure", &audit_failure, state,
353 loginuid, sessionid, sid);
357 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
358 * already have been sent via prink/syslog and so if these messages are dropped
359 * it is not a huge concern since we already passed the audit_log_lost()
360 * notification and stuff. This is just nice to get audit messages during
361 * boot before auditd is running or messages generated while auditd is stopped.
362 * This only holds messages is audit_default is set, aka booting with audit=1
363 * or building your kernel that way.
365 static void audit_hold_skb(struct sk_buff *skb)
367 if (audit_default &&
368 skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)
369 skb_queue_tail(&audit_skb_hold_queue, skb);
370 else
371 kfree_skb(skb);
375 * For one reason or another this nlh isn't getting delivered to the userspace
376 * audit daemon, just send it to printk.
378 static void audit_printk_skb(struct sk_buff *skb)
380 struct nlmsghdr *nlh = nlmsg_hdr(skb);
381 char *data = NLMSG_DATA(nlh);
383 if (nlh->nlmsg_type != AUDIT_EOE) {
384 if (printk_ratelimit())
385 printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data);
386 else
387 audit_log_lost("printk limit exceeded\n");
390 audit_hold_skb(skb);
393 static void kauditd_send_skb(struct sk_buff *skb)
395 int err;
396 /* take a reference in case we can't send it and we want to hold it */
397 skb_get(skb);
398 err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
399 if (err < 0) {
400 BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */
401 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
402 audit_log_lost("auditd dissapeared\n");
403 audit_pid = 0;
404 /* we might get lucky and get this in the next auditd */
405 audit_hold_skb(skb);
406 } else
407 /* drop the extra reference if sent ok */
408 kfree_skb(skb);
411 static int kauditd_thread(void *dummy)
413 struct sk_buff *skb;
415 set_freezable();
416 while (!kthread_should_stop()) {
418 * if auditd just started drain the queue of messages already
419 * sent to syslog/printk. remember loss here is ok. we already
420 * called audit_log_lost() if it didn't go out normally. so the
421 * race between the skb_dequeue and the next check for audit_pid
422 * doesn't matter.
424 * if you ever find kauditd to be too slow we can get a perf win
425 * by doing our own locking and keeping better track if there
426 * are messages in this queue. I don't see the need now, but
427 * in 5 years when I want to play with this again I'll see this
428 * note and still have no friggin idea what i'm thinking today.
430 if (audit_default && audit_pid) {
431 skb = skb_dequeue(&audit_skb_hold_queue);
432 if (unlikely(skb)) {
433 while (skb && audit_pid) {
434 kauditd_send_skb(skb);
435 skb = skb_dequeue(&audit_skb_hold_queue);
440 skb = skb_dequeue(&audit_skb_queue);
441 wake_up(&audit_backlog_wait);
442 if (skb) {
443 if (audit_pid)
444 kauditd_send_skb(skb);
445 else
446 audit_printk_skb(skb);
447 } else {
448 DECLARE_WAITQUEUE(wait, current);
449 set_current_state(TASK_INTERRUPTIBLE);
450 add_wait_queue(&kauditd_wait, &wait);
452 if (!skb_queue_len(&audit_skb_queue)) {
453 try_to_freeze();
454 schedule();
457 __set_current_state(TASK_RUNNING);
458 remove_wait_queue(&kauditd_wait, &wait);
461 return 0;
464 static int audit_prepare_user_tty(pid_t pid, uid_t loginuid, u32 sessionid)
466 struct task_struct *tsk;
467 int err;
469 read_lock(&tasklist_lock);
470 tsk = find_task_by_vpid(pid);
471 err = -ESRCH;
472 if (!tsk)
473 goto out;
474 err = 0;
476 spin_lock_irq(&tsk->sighand->siglock);
477 if (!tsk->signal->audit_tty)
478 err = -EPERM;
479 spin_unlock_irq(&tsk->sighand->siglock);
480 if (err)
481 goto out;
483 tty_audit_push_task(tsk, loginuid, sessionid);
484 out:
485 read_unlock(&tasklist_lock);
486 return err;
489 int audit_send_list(void *_dest)
491 struct audit_netlink_list *dest = _dest;
492 int pid = dest->pid;
493 struct sk_buff *skb;
495 /* wait for parent to finish and send an ACK */
496 mutex_lock(&audit_cmd_mutex);
497 mutex_unlock(&audit_cmd_mutex);
499 while ((skb = __skb_dequeue(&dest->q)) != NULL)
500 netlink_unicast(audit_sock, skb, pid, 0);
502 kfree(dest);
504 return 0;
507 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
508 int multi, void *payload, int size)
510 struct sk_buff *skb;
511 struct nlmsghdr *nlh;
512 void *data;
513 int flags = multi ? NLM_F_MULTI : 0;
514 int t = done ? NLMSG_DONE : type;
516 skb = nlmsg_new(size, GFP_KERNEL);
517 if (!skb)
518 return NULL;
520 nlh = NLMSG_NEW(skb, pid, seq, t, size, flags);
521 data = NLMSG_DATA(nlh);
522 memcpy(data, payload, size);
523 return skb;
525 nlmsg_failure: /* Used by NLMSG_NEW */
526 if (skb)
527 kfree_skb(skb);
528 return NULL;
531 static int audit_send_reply_thread(void *arg)
533 struct audit_reply *reply = (struct audit_reply *)arg;
535 mutex_lock(&audit_cmd_mutex);
536 mutex_unlock(&audit_cmd_mutex);
538 /* Ignore failure. It'll only happen if the sender goes away,
539 because our timeout is set to infinite. */
540 netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
541 kfree(reply);
542 return 0;
545 * audit_send_reply - send an audit reply message via netlink
546 * @pid: process id to send reply to
547 * @seq: sequence number
548 * @type: audit message type
549 * @done: done (last) flag
550 * @multi: multi-part message flag
551 * @payload: payload data
552 * @size: payload size
554 * Allocates an skb, builds the netlink message, and sends it to the pid.
555 * No failure notifications.
557 void audit_send_reply(int pid, int seq, int type, int done, int multi,
558 void *payload, int size)
560 struct sk_buff *skb;
561 struct task_struct *tsk;
562 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
563 GFP_KERNEL);
565 if (!reply)
566 return;
568 skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
569 if (!skb)
570 goto out;
572 reply->pid = pid;
573 reply->skb = skb;
575 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
576 if (!IS_ERR(tsk))
577 return;
578 kfree_skb(skb);
579 out:
580 kfree(reply);
584 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
585 * control messages.
587 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
589 int err = 0;
591 switch (msg_type) {
592 case AUDIT_GET:
593 case AUDIT_LIST:
594 case AUDIT_LIST_RULES:
595 case AUDIT_SET:
596 case AUDIT_ADD:
597 case AUDIT_ADD_RULE:
598 case AUDIT_DEL:
599 case AUDIT_DEL_RULE:
600 case AUDIT_SIGNAL_INFO:
601 case AUDIT_TTY_GET:
602 case AUDIT_TTY_SET:
603 case AUDIT_TRIM:
604 case AUDIT_MAKE_EQUIV:
605 if (security_netlink_recv(skb, CAP_AUDIT_CONTROL))
606 err = -EPERM;
607 break;
608 case AUDIT_USER:
609 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
610 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
611 if (security_netlink_recv(skb, CAP_AUDIT_WRITE))
612 err = -EPERM;
613 break;
614 default: /* bad msg */
615 err = -EINVAL;
618 return err;
621 static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
622 u32 pid, u32 uid, uid_t auid, u32 ses,
623 u32 sid)
625 int rc = 0;
626 char *ctx = NULL;
627 u32 len;
629 if (!audit_enabled) {
630 *ab = NULL;
631 return rc;
634 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
635 audit_log_format(*ab, "user pid=%d uid=%u auid=%u ses=%u",
636 pid, uid, auid, ses);
637 if (sid) {
638 rc = security_secid_to_secctx(sid, &ctx, &len);
639 if (rc)
640 audit_log_format(*ab, " ssid=%u", sid);
641 else {
642 audit_log_format(*ab, " subj=%s", ctx);
643 security_release_secctx(ctx, len);
647 return rc;
650 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
652 u32 uid, pid, seq, sid;
653 void *data;
654 struct audit_status *status_get, status_set;
655 int err;
656 struct audit_buffer *ab;
657 u16 msg_type = nlh->nlmsg_type;
658 uid_t loginuid; /* loginuid of sender */
659 u32 sessionid;
660 struct audit_sig_info *sig_data;
661 char *ctx = NULL;
662 u32 len;
664 err = audit_netlink_ok(skb, msg_type);
665 if (err)
666 return err;
668 /* As soon as there's any sign of userspace auditd,
669 * start kauditd to talk to it */
670 if (!kauditd_task)
671 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
672 if (IS_ERR(kauditd_task)) {
673 err = PTR_ERR(kauditd_task);
674 kauditd_task = NULL;
675 return err;
678 pid = NETLINK_CREDS(skb)->pid;
679 uid = NETLINK_CREDS(skb)->uid;
680 loginuid = NETLINK_CB(skb).loginuid;
681 sessionid = NETLINK_CB(skb).sessionid;
682 sid = NETLINK_CB(skb).sid;
683 seq = nlh->nlmsg_seq;
684 data = NLMSG_DATA(nlh);
686 switch (msg_type) {
687 case AUDIT_GET:
688 status_set.enabled = audit_enabled;
689 status_set.failure = audit_failure;
690 status_set.pid = audit_pid;
691 status_set.rate_limit = audit_rate_limit;
692 status_set.backlog_limit = audit_backlog_limit;
693 status_set.lost = atomic_read(&audit_lost);
694 status_set.backlog = skb_queue_len(&audit_skb_queue);
695 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0,
696 &status_set, sizeof(status_set));
697 break;
698 case AUDIT_SET:
699 if (nlh->nlmsg_len < sizeof(struct audit_status))
700 return -EINVAL;
701 status_get = (struct audit_status *)data;
702 if (status_get->mask & AUDIT_STATUS_ENABLED) {
703 err = audit_set_enabled(status_get->enabled,
704 loginuid, sessionid, sid);
705 if (err < 0)
706 return err;
708 if (status_get->mask & AUDIT_STATUS_FAILURE) {
709 err = audit_set_failure(status_get->failure,
710 loginuid, sessionid, sid);
711 if (err < 0)
712 return err;
714 if (status_get->mask & AUDIT_STATUS_PID) {
715 int new_pid = status_get->pid;
717 if (audit_enabled != AUDIT_OFF)
718 audit_log_config_change("audit_pid", new_pid,
719 audit_pid, loginuid,
720 sessionid, sid, 1);
722 audit_pid = new_pid;
723 audit_nlk_pid = NETLINK_CB(skb).pid;
725 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
726 err = audit_set_rate_limit(status_get->rate_limit,
727 loginuid, sessionid, sid);
728 if (err < 0)
729 return err;
731 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
732 err = audit_set_backlog_limit(status_get->backlog_limit,
733 loginuid, sessionid, sid);
734 break;
735 case AUDIT_USER:
736 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
737 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
738 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
739 return 0;
741 err = audit_filter_user(&NETLINK_CB(skb));
742 if (err == 1) {
743 err = 0;
744 if (msg_type == AUDIT_USER_TTY) {
745 err = audit_prepare_user_tty(pid, loginuid,
746 sessionid);
747 if (err)
748 break;
750 audit_log_common_recv_msg(&ab, msg_type, pid, uid,
751 loginuid, sessionid, sid);
753 if (msg_type != AUDIT_USER_TTY)
754 audit_log_format(ab, " msg='%.1024s'",
755 (char *)data);
756 else {
757 int size;
759 audit_log_format(ab, " msg=");
760 size = nlmsg_len(nlh);
761 if (size > 0 &&
762 ((unsigned char *)data)[size - 1] == '\0')
763 size--;
764 audit_log_n_untrustedstring(ab, data, size);
766 audit_set_pid(ab, pid);
767 audit_log_end(ab);
769 break;
770 case AUDIT_ADD:
771 case AUDIT_DEL:
772 if (nlmsg_len(nlh) < sizeof(struct audit_rule))
773 return -EINVAL;
774 if (audit_enabled == AUDIT_LOCKED) {
775 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
776 uid, loginuid, sessionid, sid);
778 audit_log_format(ab, " audit_enabled=%d res=0",
779 audit_enabled);
780 audit_log_end(ab);
781 return -EPERM;
783 /* fallthrough */
784 case AUDIT_LIST:
785 err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
786 uid, seq, data, nlmsg_len(nlh),
787 loginuid, sessionid, sid);
788 break;
789 case AUDIT_ADD_RULE:
790 case AUDIT_DEL_RULE:
791 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
792 return -EINVAL;
793 if (audit_enabled == AUDIT_LOCKED) {
794 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
795 uid, loginuid, sessionid, sid);
797 audit_log_format(ab, " audit_enabled=%d res=0",
798 audit_enabled);
799 audit_log_end(ab);
800 return -EPERM;
802 /* fallthrough */
803 case AUDIT_LIST_RULES:
804 err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
805 uid, seq, data, nlmsg_len(nlh),
806 loginuid, sessionid, sid);
807 break;
808 case AUDIT_TRIM:
809 audit_trim_trees();
811 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
812 uid, loginuid, sessionid, sid);
814 audit_log_format(ab, " op=trim res=1");
815 audit_log_end(ab);
816 break;
817 case AUDIT_MAKE_EQUIV: {
818 void *bufp = data;
819 u32 sizes[2];
820 size_t msglen = nlmsg_len(nlh);
821 char *old, *new;
823 err = -EINVAL;
824 if (msglen < 2 * sizeof(u32))
825 break;
826 memcpy(sizes, bufp, 2 * sizeof(u32));
827 bufp += 2 * sizeof(u32);
828 msglen -= 2 * sizeof(u32);
829 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
830 if (IS_ERR(old)) {
831 err = PTR_ERR(old);
832 break;
834 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
835 if (IS_ERR(new)) {
836 err = PTR_ERR(new);
837 kfree(old);
838 break;
840 /* OK, here comes... */
841 err = audit_tag_tree(old, new);
843 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
844 uid, loginuid, sessionid, sid);
846 audit_log_format(ab, " op=make_equiv old=");
847 audit_log_untrustedstring(ab, old);
848 audit_log_format(ab, " new=");
849 audit_log_untrustedstring(ab, new);
850 audit_log_format(ab, " res=%d", !err);
851 audit_log_end(ab);
852 kfree(old);
853 kfree(new);
854 break;
856 case AUDIT_SIGNAL_INFO:
857 len = 0;
858 if (audit_sig_sid) {
859 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
860 if (err)
861 return err;
863 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
864 if (!sig_data) {
865 if (audit_sig_sid)
866 security_release_secctx(ctx, len);
867 return -ENOMEM;
869 sig_data->uid = audit_sig_uid;
870 sig_data->pid = audit_sig_pid;
871 if (audit_sig_sid) {
872 memcpy(sig_data->ctx, ctx, len);
873 security_release_secctx(ctx, len);
875 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO,
876 0, 0, sig_data, sizeof(*sig_data) + len);
877 kfree(sig_data);
878 break;
879 case AUDIT_TTY_GET: {
880 struct audit_tty_status s;
881 struct task_struct *tsk;
883 read_lock(&tasklist_lock);
884 tsk = find_task_by_vpid(pid);
885 if (!tsk)
886 err = -ESRCH;
887 else {
888 spin_lock_irq(&tsk->sighand->siglock);
889 s.enabled = tsk->signal->audit_tty != 0;
890 spin_unlock_irq(&tsk->sighand->siglock);
892 read_unlock(&tasklist_lock);
893 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_TTY_GET, 0, 0,
894 &s, sizeof(s));
895 break;
897 case AUDIT_TTY_SET: {
898 struct audit_tty_status *s;
899 struct task_struct *tsk;
901 if (nlh->nlmsg_len < sizeof(struct audit_tty_status))
902 return -EINVAL;
903 s = data;
904 if (s->enabled != 0 && s->enabled != 1)
905 return -EINVAL;
906 read_lock(&tasklist_lock);
907 tsk = find_task_by_vpid(pid);
908 if (!tsk)
909 err = -ESRCH;
910 else {
911 spin_lock_irq(&tsk->sighand->siglock);
912 tsk->signal->audit_tty = s->enabled != 0;
913 spin_unlock_irq(&tsk->sighand->siglock);
915 read_unlock(&tasklist_lock);
916 break;
918 default:
919 err = -EINVAL;
920 break;
923 return err < 0 ? err : 0;
927 * Get message from skb. Each message is processed by audit_receive_msg.
928 * Malformed skbs with wrong length are discarded silently.
930 static void audit_receive_skb(struct sk_buff *skb)
932 struct nlmsghdr *nlh;
934 * len MUST be signed for NLMSG_NEXT to be able to dec it below 0
935 * if the nlmsg_len was not aligned
937 int len;
938 int err;
940 nlh = nlmsg_hdr(skb);
941 len = skb->len;
943 while (NLMSG_OK(nlh, len)) {
944 err = audit_receive_msg(skb, nlh);
945 /* if err or if this message says it wants a response */
946 if (err || (nlh->nlmsg_flags & NLM_F_ACK))
947 netlink_ack(skb, nlh, err);
949 nlh = NLMSG_NEXT(nlh, len);
953 /* Receive messages from netlink socket. */
954 static void audit_receive(struct sk_buff *skb)
956 mutex_lock(&audit_cmd_mutex);
957 audit_receive_skb(skb);
958 mutex_unlock(&audit_cmd_mutex);
961 /* Initialize audit support at boot time. */
962 static int __init audit_init(void)
964 int i;
966 if (audit_initialized == AUDIT_DISABLED)
967 return 0;
969 printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
970 audit_default ? "enabled" : "disabled");
971 audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, 0,
972 audit_receive, NULL, THIS_MODULE);
973 if (!audit_sock)
974 audit_panic("cannot initialize netlink socket");
975 else
976 audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
978 skb_queue_head_init(&audit_skb_queue);
979 skb_queue_head_init(&audit_skb_hold_queue);
980 audit_initialized = AUDIT_INITIALIZED;
981 audit_enabled = audit_default;
982 audit_ever_enabled |= !!audit_default;
984 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
986 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
987 INIT_LIST_HEAD(&audit_inode_hash[i]);
989 return 0;
991 __initcall(audit_init);
993 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
994 static int __init audit_enable(char *str)
996 audit_default = !!simple_strtol(str, NULL, 0);
997 if (!audit_default)
998 audit_initialized = AUDIT_DISABLED;
1000 printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
1002 if (audit_initialized == AUDIT_INITIALIZED) {
1003 audit_enabled = audit_default;
1004 audit_ever_enabled |= !!audit_default;
1005 } else if (audit_initialized == AUDIT_UNINITIALIZED) {
1006 printk(" (after initialization)");
1007 } else {
1008 printk(" (until reboot)");
1010 printk("\n");
1012 return 1;
1015 __setup("audit=", audit_enable);
1017 static void audit_buffer_free(struct audit_buffer *ab)
1019 unsigned long flags;
1021 if (!ab)
1022 return;
1024 if (ab->skb)
1025 kfree_skb(ab->skb);
1027 spin_lock_irqsave(&audit_freelist_lock, flags);
1028 if (audit_freelist_count > AUDIT_MAXFREE)
1029 kfree(ab);
1030 else {
1031 audit_freelist_count++;
1032 list_add(&ab->list, &audit_freelist);
1034 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1037 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1038 gfp_t gfp_mask, int type)
1040 unsigned long flags;
1041 struct audit_buffer *ab = NULL;
1042 struct nlmsghdr *nlh;
1044 spin_lock_irqsave(&audit_freelist_lock, flags);
1045 if (!list_empty(&audit_freelist)) {
1046 ab = list_entry(audit_freelist.next,
1047 struct audit_buffer, list);
1048 list_del(&ab->list);
1049 --audit_freelist_count;
1051 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1053 if (!ab) {
1054 ab = kmalloc(sizeof(*ab), gfp_mask);
1055 if (!ab)
1056 goto err;
1059 ab->ctx = ctx;
1060 ab->gfp_mask = gfp_mask;
1062 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1063 if (!ab->skb)
1064 goto nlmsg_failure;
1066 nlh = NLMSG_NEW(ab->skb, 0, 0, type, 0, 0);
1068 return ab;
1070 nlmsg_failure: /* Used by NLMSG_NEW */
1071 kfree_skb(ab->skb);
1072 ab->skb = NULL;
1073 err:
1074 audit_buffer_free(ab);
1075 return NULL;
1079 * audit_serial - compute a serial number for the audit record
1081 * Compute a serial number for the audit record. Audit records are
1082 * written to user-space as soon as they are generated, so a complete
1083 * audit record may be written in several pieces. The timestamp of the
1084 * record and this serial number are used by the user-space tools to
1085 * determine which pieces belong to the same audit record. The
1086 * (timestamp,serial) tuple is unique for each syscall and is live from
1087 * syscall entry to syscall exit.
1089 * NOTE: Another possibility is to store the formatted records off the
1090 * audit context (for those records that have a context), and emit them
1091 * all at syscall exit. However, this could delay the reporting of
1092 * significant errors until syscall exit (or never, if the system
1093 * halts).
1095 unsigned int audit_serial(void)
1097 static DEFINE_SPINLOCK(serial_lock);
1098 static unsigned int serial = 0;
1100 unsigned long flags;
1101 unsigned int ret;
1103 spin_lock_irqsave(&serial_lock, flags);
1104 do {
1105 ret = ++serial;
1106 } while (unlikely(!ret));
1107 spin_unlock_irqrestore(&serial_lock, flags);
1109 return ret;
1112 static inline void audit_get_stamp(struct audit_context *ctx,
1113 struct timespec *t, unsigned int *serial)
1115 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
1116 *t = CURRENT_TIME;
1117 *serial = audit_serial();
1121 /* Obtain an audit buffer. This routine does locking to obtain the
1122 * audit buffer, but then no locking is required for calls to
1123 * audit_log_*format. If the tsk is a task that is currently in a
1124 * syscall, then the syscall is marked as auditable and an audit record
1125 * will be written at syscall exit. If there is no associated task, tsk
1126 * should be NULL. */
1129 * audit_log_start - obtain an audit buffer
1130 * @ctx: audit_context (may be NULL)
1131 * @gfp_mask: type of allocation
1132 * @type: audit message type
1134 * Returns audit_buffer pointer on success or NULL on error.
1136 * Obtain an audit buffer. This routine does locking to obtain the
1137 * audit buffer, but then no locking is required for calls to
1138 * audit_log_*format. If the task (ctx) is a task that is currently in a
1139 * syscall, then the syscall is marked as auditable and an audit record
1140 * will be written at syscall exit. If there is no associated task, then
1141 * task context (ctx) should be NULL.
1143 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1144 int type)
1146 struct audit_buffer *ab = NULL;
1147 struct timespec t;
1148 unsigned int uninitialized_var(serial);
1149 int reserve;
1150 unsigned long timeout_start = jiffies;
1152 if (audit_initialized != AUDIT_INITIALIZED)
1153 return NULL;
1155 if (unlikely(audit_filter_type(type)))
1156 return NULL;
1158 if (gfp_mask & __GFP_WAIT)
1159 reserve = 0;
1160 else
1161 reserve = 5; /* Allow atomic callers to go up to five
1162 entries over the normal backlog limit */
1164 while (audit_backlog_limit
1165 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1166 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time
1167 && time_before(jiffies, timeout_start + audit_backlog_wait_time)) {
1169 /* Wait for auditd to drain the queue a little */
1170 DECLARE_WAITQUEUE(wait, current);
1171 set_current_state(TASK_INTERRUPTIBLE);
1172 add_wait_queue(&audit_backlog_wait, &wait);
1174 if (audit_backlog_limit &&
1175 skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
1176 schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies);
1178 __set_current_state(TASK_RUNNING);
1179 remove_wait_queue(&audit_backlog_wait, &wait);
1180 continue;
1182 if (audit_rate_check() && printk_ratelimit())
1183 printk(KERN_WARNING
1184 "audit: audit_backlog=%d > "
1185 "audit_backlog_limit=%d\n",
1186 skb_queue_len(&audit_skb_queue),
1187 audit_backlog_limit);
1188 audit_log_lost("backlog limit exceeded");
1189 audit_backlog_wait_time = audit_backlog_wait_overflow;
1190 wake_up(&audit_backlog_wait);
1191 return NULL;
1194 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1195 if (!ab) {
1196 audit_log_lost("out of memory in audit_log_start");
1197 return NULL;
1200 audit_get_stamp(ab->ctx, &t, &serial);
1202 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1203 t.tv_sec, t.tv_nsec/1000000, serial);
1204 return ab;
1208 * audit_expand - expand skb in the audit buffer
1209 * @ab: audit_buffer
1210 * @extra: space to add at tail of the skb
1212 * Returns 0 (no space) on failed expansion, or available space if
1213 * successful.
1215 static inline int audit_expand(struct audit_buffer *ab, int extra)
1217 struct sk_buff *skb = ab->skb;
1218 int oldtail = skb_tailroom(skb);
1219 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1220 int newtail = skb_tailroom(skb);
1222 if (ret < 0) {
1223 audit_log_lost("out of memory in audit_expand");
1224 return 0;
1227 skb->truesize += newtail - oldtail;
1228 return newtail;
1232 * Format an audit message into the audit buffer. If there isn't enough
1233 * room in the audit buffer, more room will be allocated and vsnprint
1234 * will be called a second time. Currently, we assume that a printk
1235 * can't format message larger than 1024 bytes, so we don't either.
1237 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1238 va_list args)
1240 int len, avail;
1241 struct sk_buff *skb;
1242 va_list args2;
1244 if (!ab)
1245 return;
1247 BUG_ON(!ab->skb);
1248 skb = ab->skb;
1249 avail = skb_tailroom(skb);
1250 if (avail == 0) {
1251 avail = audit_expand(ab, AUDIT_BUFSIZ);
1252 if (!avail)
1253 goto out;
1255 va_copy(args2, args);
1256 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1257 if (len >= avail) {
1258 /* The printk buffer is 1024 bytes long, so if we get
1259 * here and AUDIT_BUFSIZ is at least 1024, then we can
1260 * log everything that printk could have logged. */
1261 avail = audit_expand(ab,
1262 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1263 if (!avail)
1264 goto out;
1265 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1267 va_end(args2);
1268 if (len > 0)
1269 skb_put(skb, len);
1270 out:
1271 return;
1275 * audit_log_format - format a message into the audit buffer.
1276 * @ab: audit_buffer
1277 * @fmt: format string
1278 * @...: optional parameters matching @fmt string
1280 * All the work is done in audit_log_vformat.
1282 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1284 va_list args;
1286 if (!ab)
1287 return;
1288 va_start(args, fmt);
1289 audit_log_vformat(ab, fmt, args);
1290 va_end(args);
1294 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1295 * @ab: the audit_buffer
1296 * @buf: buffer to convert to hex
1297 * @len: length of @buf to be converted
1299 * No return value; failure to expand is silently ignored.
1301 * This function will take the passed buf and convert it into a string of
1302 * ascii hex digits. The new string is placed onto the skb.
1304 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1305 size_t len)
1307 int i, avail, new_len;
1308 unsigned char *ptr;
1309 struct sk_buff *skb;
1310 static const unsigned char *hex = "0123456789ABCDEF";
1312 if (!ab)
1313 return;
1315 BUG_ON(!ab->skb);
1316 skb = ab->skb;
1317 avail = skb_tailroom(skb);
1318 new_len = len<<1;
1319 if (new_len >= avail) {
1320 /* Round the buffer request up to the next multiple */
1321 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1322 avail = audit_expand(ab, new_len);
1323 if (!avail)
1324 return;
1327 ptr = skb_tail_pointer(skb);
1328 for (i=0; i<len; i++) {
1329 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
1330 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
1332 *ptr = 0;
1333 skb_put(skb, len << 1); /* new string is twice the old string */
1337 * Format a string of no more than slen characters into the audit buffer,
1338 * enclosed in quote marks.
1340 void audit_log_n_string(struct audit_buffer *ab, const char *string,
1341 size_t slen)
1343 int avail, new_len;
1344 unsigned char *ptr;
1345 struct sk_buff *skb;
1347 if (!ab)
1348 return;
1350 BUG_ON(!ab->skb);
1351 skb = ab->skb;
1352 avail = skb_tailroom(skb);
1353 new_len = slen + 3; /* enclosing quotes + null terminator */
1354 if (new_len > avail) {
1355 avail = audit_expand(ab, new_len);
1356 if (!avail)
1357 return;
1359 ptr = skb_tail_pointer(skb);
1360 *ptr++ = '"';
1361 memcpy(ptr, string, slen);
1362 ptr += slen;
1363 *ptr++ = '"';
1364 *ptr = 0;
1365 skb_put(skb, slen + 2); /* don't include null terminator */
1369 * audit_string_contains_control - does a string need to be logged in hex
1370 * @string: string to be checked
1371 * @len: max length of the string to check
1373 int audit_string_contains_control(const char *string, size_t len)
1375 const unsigned char *p;
1376 for (p = string; p < (const unsigned char *)string + len; p++) {
1377 if (*p == '"' || *p < 0x21 || *p > 0x7e)
1378 return 1;
1380 return 0;
1384 * audit_log_n_untrustedstring - log a string that may contain random characters
1385 * @ab: audit_buffer
1386 * @len: length of string (not including trailing null)
1387 * @string: string to be logged
1389 * This code will escape a string that is passed to it if the string
1390 * contains a control character, unprintable character, double quote mark,
1391 * or a space. Unescaped strings will start and end with a double quote mark.
1392 * Strings that are escaped are printed in hex (2 digits per char).
1394 * The caller specifies the number of characters in the string to log, which may
1395 * or may not be the entire string.
1397 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1398 size_t len)
1400 if (audit_string_contains_control(string, len))
1401 audit_log_n_hex(ab, string, len);
1402 else
1403 audit_log_n_string(ab, string, len);
1407 * audit_log_untrustedstring - log a string that may contain random characters
1408 * @ab: audit_buffer
1409 * @string: string to be logged
1411 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1412 * determine string length.
1414 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1416 audit_log_n_untrustedstring(ab, string, strlen(string));
1419 /* This is a helper-function to print the escaped d_path */
1420 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1421 struct path *path)
1423 char *p, *pathname;
1425 if (prefix)
1426 audit_log_format(ab, " %s", prefix);
1428 /* We will allow 11 spaces for ' (deleted)' to be appended */
1429 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1430 if (!pathname) {
1431 audit_log_string(ab, "<no_memory>");
1432 return;
1434 p = d_path(path, pathname, PATH_MAX+11);
1435 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
1436 /* FIXME: can we save some information here? */
1437 audit_log_string(ab, "<too_long>");
1438 } else
1439 audit_log_untrustedstring(ab, p);
1440 kfree(pathname);
1443 void audit_log_key(struct audit_buffer *ab, char *key)
1445 audit_log_format(ab, " key=");
1446 if (key)
1447 audit_log_untrustedstring(ab, key);
1448 else
1449 audit_log_format(ab, "(null)");
1453 * audit_log_end - end one audit record
1454 * @ab: the audit_buffer
1456 * The netlink_* functions cannot be called inside an irq context, so
1457 * the audit buffer is placed on a queue and a tasklet is scheduled to
1458 * remove them from the queue outside the irq context. May be called in
1459 * any context.
1461 void audit_log_end(struct audit_buffer *ab)
1463 if (!ab)
1464 return;
1465 if (!audit_rate_check()) {
1466 audit_log_lost("rate limit exceeded");
1467 } else {
1468 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1469 nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
1471 if (audit_pid) {
1472 skb_queue_tail(&audit_skb_queue, ab->skb);
1473 wake_up_interruptible(&kauditd_wait);
1474 } else {
1475 audit_printk_skb(ab->skb);
1477 ab->skb = NULL;
1479 audit_buffer_free(ab);
1483 * audit_log - Log an audit record
1484 * @ctx: audit context
1485 * @gfp_mask: type of allocation
1486 * @type: audit message type
1487 * @fmt: format string to use
1488 * @...: variable parameters matching the format string
1490 * This is a convenience function that calls audit_log_start,
1491 * audit_log_vformat, and audit_log_end. It may be called
1492 * in any context.
1494 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1495 const char *fmt, ...)
1497 struct audit_buffer *ab;
1498 va_list args;
1500 ab = audit_log_start(ctx, gfp_mask, type);
1501 if (ab) {
1502 va_start(args, fmt);
1503 audit_log_vformat(ab, fmt, args);
1504 va_end(args);
1505 audit_log_end(ab);
1509 EXPORT_SYMBOL(audit_log_start);
1510 EXPORT_SYMBOL(audit_log_end);
1511 EXPORT_SYMBOL(audit_log_format);
1512 EXPORT_SYMBOL(audit_log);