Linux 2.6.33-rc6
[cris-mirror.git] / kernel / audit.c
blob5feed232be9d4b55f72f5b38a010e4e6619c7a19
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/inotify.h>
59 #include <linux/freezer.h>
60 #include <linux/tty.h>
62 #include "audit.h"
64 /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
65 * (Initialization happens after skb_init is called.) */
66 #define AUDIT_DISABLED -1
67 #define AUDIT_UNINITIALIZED 0
68 #define AUDIT_INITIALIZED 1
69 static int audit_initialized;
71 #define AUDIT_OFF 0
72 #define AUDIT_ON 1
73 #define AUDIT_LOCKED 2
74 int audit_enabled;
75 int audit_ever_enabled;
77 /* Default state when kernel boots without any parameters. */
78 static int audit_default;
80 /* If auditing cannot proceed, audit_failure selects what happens. */
81 static int audit_failure = AUDIT_FAIL_PRINTK;
84 * If audit records are to be written to the netlink socket, audit_pid
85 * contains the pid of the auditd process and audit_nlk_pid contains
86 * the pid to use to send netlink messages to that process.
88 int audit_pid;
89 static int audit_nlk_pid;
91 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
92 * to that number per second. This prevents DoS attacks, but results in
93 * audit records being dropped. */
94 static int audit_rate_limit;
96 /* Number of outstanding audit_buffers allowed. */
97 static int audit_backlog_limit = 64;
98 static int audit_backlog_wait_time = 60 * HZ;
99 static int audit_backlog_wait_overflow = 0;
101 /* The identity of the user shutting down the audit system. */
102 uid_t audit_sig_uid = -1;
103 pid_t audit_sig_pid = -1;
104 u32 audit_sig_sid = 0;
106 /* Records can be lost in several ways:
107 0) [suppressed in audit_alloc]
108 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
109 2) out of memory in audit_log_move [alloc_skb]
110 3) suppressed due to audit_rate_limit
111 4) suppressed due to audit_backlog_limit
113 static atomic_t audit_lost = ATOMIC_INIT(0);
115 /* The netlink socket. */
116 static struct sock *audit_sock;
118 /* Hash for inode-based rules */
119 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
121 /* The audit_freelist is a list of pre-allocated audit buffers (if more
122 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
123 * being placed on the freelist). */
124 static DEFINE_SPINLOCK(audit_freelist_lock);
125 static int audit_freelist_count;
126 static LIST_HEAD(audit_freelist);
128 static struct sk_buff_head audit_skb_queue;
129 /* queue of skbs to send to auditd when/if it comes back */
130 static struct sk_buff_head audit_skb_hold_queue;
131 static struct task_struct *kauditd_task;
132 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
133 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
135 /* Serialize requests from userspace. */
136 DEFINE_MUTEX(audit_cmd_mutex);
138 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
139 * audit records. Since printk uses a 1024 byte buffer, this buffer
140 * should be at least that large. */
141 #define AUDIT_BUFSIZ 1024
143 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
144 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
145 #define AUDIT_MAXFREE (2*NR_CPUS)
147 /* The audit_buffer is used when formatting an audit record. The caller
148 * locks briefly to get the record off the freelist or to allocate the
149 * buffer, and locks briefly to send the buffer to the netlink layer or
150 * to place it on a transmit queue. Multiple audit_buffers can be in
151 * use simultaneously. */
152 struct audit_buffer {
153 struct list_head list;
154 struct sk_buff *skb; /* formatted skb ready to send */
155 struct audit_context *ctx; /* NULL or associated context */
156 gfp_t gfp_mask;
159 struct audit_reply {
160 int pid;
161 struct sk_buff *skb;
164 static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
166 if (ab) {
167 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
168 nlh->nlmsg_pid = pid;
172 void audit_panic(const char *message)
174 switch (audit_failure)
176 case AUDIT_FAIL_SILENT:
177 break;
178 case AUDIT_FAIL_PRINTK:
179 if (printk_ratelimit())
180 printk(KERN_ERR "audit: %s\n", message);
181 break;
182 case AUDIT_FAIL_PANIC:
183 /* test audit_pid since printk is always losey, why bother? */
184 if (audit_pid)
185 panic("audit: %s\n", message);
186 break;
190 static inline int audit_rate_check(void)
192 static unsigned long last_check = 0;
193 static int messages = 0;
194 static DEFINE_SPINLOCK(lock);
195 unsigned long flags;
196 unsigned long now;
197 unsigned long elapsed;
198 int retval = 0;
200 if (!audit_rate_limit) return 1;
202 spin_lock_irqsave(&lock, flags);
203 if (++messages < audit_rate_limit) {
204 retval = 1;
205 } else {
206 now = jiffies;
207 elapsed = now - last_check;
208 if (elapsed > HZ) {
209 last_check = now;
210 messages = 0;
211 retval = 1;
214 spin_unlock_irqrestore(&lock, flags);
216 return retval;
220 * audit_log_lost - conditionally log lost audit message event
221 * @message: the message stating reason for lost audit message
223 * Emit at least 1 message per second, even if audit_rate_check is
224 * throttling.
225 * Always increment the lost messages counter.
227 void audit_log_lost(const char *message)
229 static unsigned long last_msg = 0;
230 static DEFINE_SPINLOCK(lock);
231 unsigned long flags;
232 unsigned long now;
233 int print;
235 atomic_inc(&audit_lost);
237 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
239 if (!print) {
240 spin_lock_irqsave(&lock, flags);
241 now = jiffies;
242 if (now - last_msg > HZ) {
243 print = 1;
244 last_msg = now;
246 spin_unlock_irqrestore(&lock, flags);
249 if (print) {
250 if (printk_ratelimit())
251 printk(KERN_WARNING
252 "audit: audit_lost=%d audit_rate_limit=%d "
253 "audit_backlog_limit=%d\n",
254 atomic_read(&audit_lost),
255 audit_rate_limit,
256 audit_backlog_limit);
257 audit_panic(message);
261 static int audit_log_config_change(char *function_name, int new, int old,
262 uid_t loginuid, u32 sessionid, u32 sid,
263 int allow_changes)
265 struct audit_buffer *ab;
266 int rc = 0;
268 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
269 audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new,
270 old, loginuid, sessionid);
271 if (sid) {
272 char *ctx = NULL;
273 u32 len;
275 rc = security_secid_to_secctx(sid, &ctx, &len);
276 if (rc) {
277 audit_log_format(ab, " sid=%u", sid);
278 allow_changes = 0; /* Something weird, deny request */
279 } else {
280 audit_log_format(ab, " subj=%s", ctx);
281 security_release_secctx(ctx, len);
284 audit_log_format(ab, " res=%d", allow_changes);
285 audit_log_end(ab);
286 return rc;
289 static int audit_do_config_change(char *function_name, int *to_change,
290 int new, uid_t loginuid, u32 sessionid,
291 u32 sid)
293 int allow_changes, rc = 0, old = *to_change;
295 /* check if we are locked */
296 if (audit_enabled == AUDIT_LOCKED)
297 allow_changes = 0;
298 else
299 allow_changes = 1;
301 if (audit_enabled != AUDIT_OFF) {
302 rc = audit_log_config_change(function_name, new, old, loginuid,
303 sessionid, sid, allow_changes);
304 if (rc)
305 allow_changes = 0;
308 /* If we are allowed, make the change */
309 if (allow_changes == 1)
310 *to_change = new;
311 /* Not allowed, update reason */
312 else if (rc == 0)
313 rc = -EPERM;
314 return rc;
317 static int audit_set_rate_limit(int limit, uid_t loginuid, u32 sessionid,
318 u32 sid)
320 return audit_do_config_change("audit_rate_limit", &audit_rate_limit,
321 limit, loginuid, sessionid, sid);
324 static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sessionid,
325 u32 sid)
327 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit,
328 limit, loginuid, sessionid, sid);
331 static int audit_set_enabled(int state, uid_t loginuid, u32 sessionid, u32 sid)
333 int rc;
334 if (state < AUDIT_OFF || state > AUDIT_LOCKED)
335 return -EINVAL;
337 rc = audit_do_config_change("audit_enabled", &audit_enabled, state,
338 loginuid, sessionid, sid);
340 if (!rc)
341 audit_ever_enabled |= !!state;
343 return rc;
346 static int audit_set_failure(int state, uid_t loginuid, u32 sessionid, u32 sid)
348 if (state != AUDIT_FAIL_SILENT
349 && state != AUDIT_FAIL_PRINTK
350 && state != AUDIT_FAIL_PANIC)
351 return -EINVAL;
353 return audit_do_config_change("audit_failure", &audit_failure, state,
354 loginuid, sessionid, sid);
358 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
359 * already have been sent via prink/syslog and so if these messages are dropped
360 * it is not a huge concern since we already passed the audit_log_lost()
361 * notification and stuff. This is just nice to get audit messages during
362 * boot before auditd is running or messages generated while auditd is stopped.
363 * This only holds messages is audit_default is set, aka booting with audit=1
364 * or building your kernel that way.
366 static void audit_hold_skb(struct sk_buff *skb)
368 if (audit_default &&
369 skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)
370 skb_queue_tail(&audit_skb_hold_queue, skb);
371 else
372 kfree_skb(skb);
376 * For one reason or another this nlh isn't getting delivered to the userspace
377 * audit daemon, just send it to printk.
379 static void audit_printk_skb(struct sk_buff *skb)
381 struct nlmsghdr *nlh = nlmsg_hdr(skb);
382 char *data = NLMSG_DATA(nlh);
384 if (nlh->nlmsg_type != AUDIT_EOE) {
385 if (printk_ratelimit())
386 printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data);
387 else
388 audit_log_lost("printk limit exceeded\n");
391 audit_hold_skb(skb);
394 static void kauditd_send_skb(struct sk_buff *skb)
396 int err;
397 /* take a reference in case we can't send it and we want to hold it */
398 skb_get(skb);
399 err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
400 if (err < 0) {
401 BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */
402 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
403 audit_log_lost("auditd dissapeared\n");
404 audit_pid = 0;
405 /* we might get lucky and get this in the next auditd */
406 audit_hold_skb(skb);
407 } else
408 /* drop the extra reference if sent ok */
409 kfree_skb(skb);
412 static int kauditd_thread(void *dummy)
414 struct sk_buff *skb;
416 set_freezable();
417 while (!kthread_should_stop()) {
419 * if auditd just started drain the queue of messages already
420 * sent to syslog/printk. remember loss here is ok. we already
421 * called audit_log_lost() if it didn't go out normally. so the
422 * race between the skb_dequeue and the next check for audit_pid
423 * doesn't matter.
425 * if you ever find kauditd to be too slow we can get a perf win
426 * by doing our own locking and keeping better track if there
427 * are messages in this queue. I don't see the need now, but
428 * in 5 years when I want to play with this again I'll see this
429 * note and still have no friggin idea what i'm thinking today.
431 if (audit_default && audit_pid) {
432 skb = skb_dequeue(&audit_skb_hold_queue);
433 if (unlikely(skb)) {
434 while (skb && audit_pid) {
435 kauditd_send_skb(skb);
436 skb = skb_dequeue(&audit_skb_hold_queue);
441 skb = skb_dequeue(&audit_skb_queue);
442 wake_up(&audit_backlog_wait);
443 if (skb) {
444 if (audit_pid)
445 kauditd_send_skb(skb);
446 else
447 audit_printk_skb(skb);
448 } else {
449 DECLARE_WAITQUEUE(wait, current);
450 set_current_state(TASK_INTERRUPTIBLE);
451 add_wait_queue(&kauditd_wait, &wait);
453 if (!skb_queue_len(&audit_skb_queue)) {
454 try_to_freeze();
455 schedule();
458 __set_current_state(TASK_RUNNING);
459 remove_wait_queue(&kauditd_wait, &wait);
462 return 0;
465 static int audit_prepare_user_tty(pid_t pid, uid_t loginuid, u32 sessionid)
467 struct task_struct *tsk;
468 int err;
470 read_lock(&tasklist_lock);
471 tsk = find_task_by_vpid(pid);
472 err = -ESRCH;
473 if (!tsk)
474 goto out;
475 err = 0;
477 spin_lock_irq(&tsk->sighand->siglock);
478 if (!tsk->signal->audit_tty)
479 err = -EPERM;
480 spin_unlock_irq(&tsk->sighand->siglock);
481 if (err)
482 goto out;
484 tty_audit_push_task(tsk, loginuid, sessionid);
485 out:
486 read_unlock(&tasklist_lock);
487 return err;
490 int audit_send_list(void *_dest)
492 struct audit_netlink_list *dest = _dest;
493 int pid = dest->pid;
494 struct sk_buff *skb;
496 /* wait for parent to finish and send an ACK */
497 mutex_lock(&audit_cmd_mutex);
498 mutex_unlock(&audit_cmd_mutex);
500 while ((skb = __skb_dequeue(&dest->q)) != NULL)
501 netlink_unicast(audit_sock, skb, pid, 0);
503 kfree(dest);
505 return 0;
508 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
509 int multi, void *payload, int size)
511 struct sk_buff *skb;
512 struct nlmsghdr *nlh;
513 void *data;
514 int flags = multi ? NLM_F_MULTI : 0;
515 int t = done ? NLMSG_DONE : type;
517 skb = nlmsg_new(size, GFP_KERNEL);
518 if (!skb)
519 return NULL;
521 nlh = NLMSG_NEW(skb, pid, seq, t, size, flags);
522 data = NLMSG_DATA(nlh);
523 memcpy(data, payload, size);
524 return skb;
526 nlmsg_failure: /* Used by NLMSG_NEW */
527 if (skb)
528 kfree_skb(skb);
529 return NULL;
532 static int audit_send_reply_thread(void *arg)
534 struct audit_reply *reply = (struct audit_reply *)arg;
536 mutex_lock(&audit_cmd_mutex);
537 mutex_unlock(&audit_cmd_mutex);
539 /* Ignore failure. It'll only happen if the sender goes away,
540 because our timeout is set to infinite. */
541 netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
542 kfree(reply);
543 return 0;
546 * audit_send_reply - send an audit reply message via netlink
547 * @pid: process id to send reply to
548 * @seq: sequence number
549 * @type: audit message type
550 * @done: done (last) flag
551 * @multi: multi-part message flag
552 * @payload: payload data
553 * @size: payload size
555 * Allocates an skb, builds the netlink message, and sends it to the pid.
556 * No failure notifications.
558 void audit_send_reply(int pid, int seq, int type, int done, int multi,
559 void *payload, int size)
561 struct sk_buff *skb;
562 struct task_struct *tsk;
563 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
564 GFP_KERNEL);
566 if (!reply)
567 return;
569 skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
570 if (!skb)
571 goto out;
573 reply->pid = pid;
574 reply->skb = skb;
576 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
577 if (!IS_ERR(tsk))
578 return;
579 kfree_skb(skb);
580 out:
581 kfree(reply);
585 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
586 * control messages.
588 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
590 int err = 0;
592 switch (msg_type) {
593 case AUDIT_GET:
594 case AUDIT_LIST:
595 case AUDIT_LIST_RULES:
596 case AUDIT_SET:
597 case AUDIT_ADD:
598 case AUDIT_ADD_RULE:
599 case AUDIT_DEL:
600 case AUDIT_DEL_RULE:
601 case AUDIT_SIGNAL_INFO:
602 case AUDIT_TTY_GET:
603 case AUDIT_TTY_SET:
604 case AUDIT_TRIM:
605 case AUDIT_MAKE_EQUIV:
606 if (security_netlink_recv(skb, CAP_AUDIT_CONTROL))
607 err = -EPERM;
608 break;
609 case AUDIT_USER:
610 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
611 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
612 if (security_netlink_recv(skb, CAP_AUDIT_WRITE))
613 err = -EPERM;
614 break;
615 default: /* bad msg */
616 err = -EINVAL;
619 return err;
622 static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
623 u32 pid, u32 uid, uid_t auid, u32 ses,
624 u32 sid)
626 int rc = 0;
627 char *ctx = NULL;
628 u32 len;
630 if (!audit_enabled) {
631 *ab = NULL;
632 return rc;
635 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
636 audit_log_format(*ab, "user pid=%d uid=%u auid=%u ses=%u",
637 pid, uid, auid, ses);
638 if (sid) {
639 rc = security_secid_to_secctx(sid, &ctx, &len);
640 if (rc)
641 audit_log_format(*ab, " ssid=%u", sid);
642 else {
643 audit_log_format(*ab, " subj=%s", ctx);
644 security_release_secctx(ctx, len);
648 return rc;
651 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
653 u32 uid, pid, seq, sid;
654 void *data;
655 struct audit_status *status_get, status_set;
656 int err;
657 struct audit_buffer *ab;
658 u16 msg_type = nlh->nlmsg_type;
659 uid_t loginuid; /* loginuid of sender */
660 u32 sessionid;
661 struct audit_sig_info *sig_data;
662 char *ctx = NULL;
663 u32 len;
665 err = audit_netlink_ok(skb, msg_type);
666 if (err)
667 return err;
669 /* As soon as there's any sign of userspace auditd,
670 * start kauditd to talk to it */
671 if (!kauditd_task)
672 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
673 if (IS_ERR(kauditd_task)) {
674 err = PTR_ERR(kauditd_task);
675 kauditd_task = NULL;
676 return err;
679 pid = NETLINK_CREDS(skb)->pid;
680 uid = NETLINK_CREDS(skb)->uid;
681 loginuid = NETLINK_CB(skb).loginuid;
682 sessionid = NETLINK_CB(skb).sessionid;
683 sid = NETLINK_CB(skb).sid;
684 seq = nlh->nlmsg_seq;
685 data = NLMSG_DATA(nlh);
687 switch (msg_type) {
688 case AUDIT_GET:
689 status_set.enabled = audit_enabled;
690 status_set.failure = audit_failure;
691 status_set.pid = audit_pid;
692 status_set.rate_limit = audit_rate_limit;
693 status_set.backlog_limit = audit_backlog_limit;
694 status_set.lost = atomic_read(&audit_lost);
695 status_set.backlog = skb_queue_len(&audit_skb_queue);
696 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0,
697 &status_set, sizeof(status_set));
698 break;
699 case AUDIT_SET:
700 if (nlh->nlmsg_len < sizeof(struct audit_status))
701 return -EINVAL;
702 status_get = (struct audit_status *)data;
703 if (status_get->mask & AUDIT_STATUS_ENABLED) {
704 err = audit_set_enabled(status_get->enabled,
705 loginuid, sessionid, sid);
706 if (err < 0)
707 return err;
709 if (status_get->mask & AUDIT_STATUS_FAILURE) {
710 err = audit_set_failure(status_get->failure,
711 loginuid, sessionid, sid);
712 if (err < 0)
713 return err;
715 if (status_get->mask & AUDIT_STATUS_PID) {
716 int new_pid = status_get->pid;
718 if (audit_enabled != AUDIT_OFF)
719 audit_log_config_change("audit_pid", new_pid,
720 audit_pid, loginuid,
721 sessionid, sid, 1);
723 audit_pid = new_pid;
724 audit_nlk_pid = NETLINK_CB(skb).pid;
726 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
727 err = audit_set_rate_limit(status_get->rate_limit,
728 loginuid, sessionid, sid);
729 if (err < 0)
730 return err;
732 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
733 err = audit_set_backlog_limit(status_get->backlog_limit,
734 loginuid, sessionid, sid);
735 break;
736 case AUDIT_USER:
737 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
738 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
739 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
740 return 0;
742 err = audit_filter_user(&NETLINK_CB(skb));
743 if (err == 1) {
744 err = 0;
745 if (msg_type == AUDIT_USER_TTY) {
746 err = audit_prepare_user_tty(pid, loginuid,
747 sessionid);
748 if (err)
749 break;
751 audit_log_common_recv_msg(&ab, msg_type, pid, uid,
752 loginuid, sessionid, sid);
754 if (msg_type != AUDIT_USER_TTY)
755 audit_log_format(ab, " msg='%.1024s'",
756 (char *)data);
757 else {
758 int size;
760 audit_log_format(ab, " msg=");
761 size = nlmsg_len(nlh);
762 if (size > 0 &&
763 ((unsigned char *)data)[size - 1] == '\0')
764 size--;
765 audit_log_n_untrustedstring(ab, data, size);
767 audit_set_pid(ab, pid);
768 audit_log_end(ab);
770 break;
771 case AUDIT_ADD:
772 case AUDIT_DEL:
773 if (nlmsg_len(nlh) < sizeof(struct audit_rule))
774 return -EINVAL;
775 if (audit_enabled == AUDIT_LOCKED) {
776 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
777 uid, loginuid, sessionid, sid);
779 audit_log_format(ab, " audit_enabled=%d res=0",
780 audit_enabled);
781 audit_log_end(ab);
782 return -EPERM;
784 /* fallthrough */
785 case AUDIT_LIST:
786 err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
787 uid, seq, data, nlmsg_len(nlh),
788 loginuid, sessionid, sid);
789 break;
790 case AUDIT_ADD_RULE:
791 case AUDIT_DEL_RULE:
792 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
793 return -EINVAL;
794 if (audit_enabled == AUDIT_LOCKED) {
795 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
796 uid, loginuid, sessionid, sid);
798 audit_log_format(ab, " audit_enabled=%d res=0",
799 audit_enabled);
800 audit_log_end(ab);
801 return -EPERM;
803 /* fallthrough */
804 case AUDIT_LIST_RULES:
805 err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
806 uid, seq, data, nlmsg_len(nlh),
807 loginuid, sessionid, sid);
808 break;
809 case AUDIT_TRIM:
810 audit_trim_trees();
812 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
813 uid, loginuid, sessionid, sid);
815 audit_log_format(ab, " op=trim res=1");
816 audit_log_end(ab);
817 break;
818 case AUDIT_MAKE_EQUIV: {
819 void *bufp = data;
820 u32 sizes[2];
821 size_t msglen = nlmsg_len(nlh);
822 char *old, *new;
824 err = -EINVAL;
825 if (msglen < 2 * sizeof(u32))
826 break;
827 memcpy(sizes, bufp, 2 * sizeof(u32));
828 bufp += 2 * sizeof(u32);
829 msglen -= 2 * sizeof(u32);
830 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
831 if (IS_ERR(old)) {
832 err = PTR_ERR(old);
833 break;
835 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
836 if (IS_ERR(new)) {
837 err = PTR_ERR(new);
838 kfree(old);
839 break;
841 /* OK, here comes... */
842 err = audit_tag_tree(old, new);
844 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
845 uid, loginuid, sessionid, sid);
847 audit_log_format(ab, " op=make_equiv old=");
848 audit_log_untrustedstring(ab, old);
849 audit_log_format(ab, " new=");
850 audit_log_untrustedstring(ab, new);
851 audit_log_format(ab, " res=%d", !err);
852 audit_log_end(ab);
853 kfree(old);
854 kfree(new);
855 break;
857 case AUDIT_SIGNAL_INFO:
858 len = 0;
859 if (audit_sig_sid) {
860 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
861 if (err)
862 return err;
864 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
865 if (!sig_data) {
866 if (audit_sig_sid)
867 security_release_secctx(ctx, len);
868 return -ENOMEM;
870 sig_data->uid = audit_sig_uid;
871 sig_data->pid = audit_sig_pid;
872 if (audit_sig_sid) {
873 memcpy(sig_data->ctx, ctx, len);
874 security_release_secctx(ctx, len);
876 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO,
877 0, 0, sig_data, sizeof(*sig_data) + len);
878 kfree(sig_data);
879 break;
880 case AUDIT_TTY_GET: {
881 struct audit_tty_status s;
882 struct task_struct *tsk;
884 read_lock(&tasklist_lock);
885 tsk = find_task_by_vpid(pid);
886 if (!tsk)
887 err = -ESRCH;
888 else {
889 spin_lock_irq(&tsk->sighand->siglock);
890 s.enabled = tsk->signal->audit_tty != 0;
891 spin_unlock_irq(&tsk->sighand->siglock);
893 read_unlock(&tasklist_lock);
894 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_TTY_GET, 0, 0,
895 &s, sizeof(s));
896 break;
898 case AUDIT_TTY_SET: {
899 struct audit_tty_status *s;
900 struct task_struct *tsk;
902 if (nlh->nlmsg_len < sizeof(struct audit_tty_status))
903 return -EINVAL;
904 s = data;
905 if (s->enabled != 0 && s->enabled != 1)
906 return -EINVAL;
907 read_lock(&tasklist_lock);
908 tsk = find_task_by_vpid(pid);
909 if (!tsk)
910 err = -ESRCH;
911 else {
912 spin_lock_irq(&tsk->sighand->siglock);
913 tsk->signal->audit_tty = s->enabled != 0;
914 spin_unlock_irq(&tsk->sighand->siglock);
916 read_unlock(&tasklist_lock);
917 break;
919 default:
920 err = -EINVAL;
921 break;
924 return err < 0 ? err : 0;
928 * Get message from skb. Each message is processed by audit_receive_msg.
929 * Malformed skbs with wrong length are discarded silently.
931 static void audit_receive_skb(struct sk_buff *skb)
933 struct nlmsghdr *nlh;
935 * len MUST be signed for NLMSG_NEXT to be able to dec it below 0
936 * if the nlmsg_len was not aligned
938 int len;
939 int err;
941 nlh = nlmsg_hdr(skb);
942 len = skb->len;
944 while (NLMSG_OK(nlh, len)) {
945 err = audit_receive_msg(skb, nlh);
946 /* if err or if this message says it wants a response */
947 if (err || (nlh->nlmsg_flags & NLM_F_ACK))
948 netlink_ack(skb, nlh, err);
950 nlh = NLMSG_NEXT(nlh, len);
954 /* Receive messages from netlink socket. */
955 static void audit_receive(struct sk_buff *skb)
957 mutex_lock(&audit_cmd_mutex);
958 audit_receive_skb(skb);
959 mutex_unlock(&audit_cmd_mutex);
962 /* Initialize audit support at boot time. */
963 static int __init audit_init(void)
965 int i;
967 if (audit_initialized == AUDIT_DISABLED)
968 return 0;
970 printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
971 audit_default ? "enabled" : "disabled");
972 audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, 0,
973 audit_receive, NULL, THIS_MODULE);
974 if (!audit_sock)
975 audit_panic("cannot initialize netlink socket");
976 else
977 audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
979 skb_queue_head_init(&audit_skb_queue);
980 skb_queue_head_init(&audit_skb_hold_queue);
981 audit_initialized = AUDIT_INITIALIZED;
982 audit_enabled = audit_default;
983 audit_ever_enabled |= !!audit_default;
985 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
987 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
988 INIT_LIST_HEAD(&audit_inode_hash[i]);
990 return 0;
992 __initcall(audit_init);
994 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
995 static int __init audit_enable(char *str)
997 audit_default = !!simple_strtol(str, NULL, 0);
998 if (!audit_default)
999 audit_initialized = AUDIT_DISABLED;
1001 printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
1003 if (audit_initialized == AUDIT_INITIALIZED) {
1004 audit_enabled = audit_default;
1005 audit_ever_enabled |= !!audit_default;
1006 } else if (audit_initialized == AUDIT_UNINITIALIZED) {
1007 printk(" (after initialization)");
1008 } else {
1009 printk(" (until reboot)");
1011 printk("\n");
1013 return 1;
1016 __setup("audit=", audit_enable);
1018 static void audit_buffer_free(struct audit_buffer *ab)
1020 unsigned long flags;
1022 if (!ab)
1023 return;
1025 if (ab->skb)
1026 kfree_skb(ab->skb);
1028 spin_lock_irqsave(&audit_freelist_lock, flags);
1029 if (audit_freelist_count > AUDIT_MAXFREE)
1030 kfree(ab);
1031 else {
1032 audit_freelist_count++;
1033 list_add(&ab->list, &audit_freelist);
1035 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1038 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1039 gfp_t gfp_mask, int type)
1041 unsigned long flags;
1042 struct audit_buffer *ab = NULL;
1043 struct nlmsghdr *nlh;
1045 spin_lock_irqsave(&audit_freelist_lock, flags);
1046 if (!list_empty(&audit_freelist)) {
1047 ab = list_entry(audit_freelist.next,
1048 struct audit_buffer, list);
1049 list_del(&ab->list);
1050 --audit_freelist_count;
1052 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1054 if (!ab) {
1055 ab = kmalloc(sizeof(*ab), gfp_mask);
1056 if (!ab)
1057 goto err;
1060 ab->ctx = ctx;
1061 ab->gfp_mask = gfp_mask;
1063 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1064 if (!ab->skb)
1065 goto nlmsg_failure;
1067 nlh = NLMSG_NEW(ab->skb, 0, 0, type, 0, 0);
1069 return ab;
1071 nlmsg_failure: /* Used by NLMSG_NEW */
1072 kfree_skb(ab->skb);
1073 ab->skb = NULL;
1074 err:
1075 audit_buffer_free(ab);
1076 return NULL;
1080 * audit_serial - compute a serial number for the audit record
1082 * Compute a serial number for the audit record. Audit records are
1083 * written to user-space as soon as they are generated, so a complete
1084 * audit record may be written in several pieces. The timestamp of the
1085 * record and this serial number are used by the user-space tools to
1086 * determine which pieces belong to the same audit record. The
1087 * (timestamp,serial) tuple is unique for each syscall and is live from
1088 * syscall entry to syscall exit.
1090 * NOTE: Another possibility is to store the formatted records off the
1091 * audit context (for those records that have a context), and emit them
1092 * all at syscall exit. However, this could delay the reporting of
1093 * significant errors until syscall exit (or never, if the system
1094 * halts).
1096 unsigned int audit_serial(void)
1098 static DEFINE_SPINLOCK(serial_lock);
1099 static unsigned int serial = 0;
1101 unsigned long flags;
1102 unsigned int ret;
1104 spin_lock_irqsave(&serial_lock, flags);
1105 do {
1106 ret = ++serial;
1107 } while (unlikely(!ret));
1108 spin_unlock_irqrestore(&serial_lock, flags);
1110 return ret;
1113 static inline void audit_get_stamp(struct audit_context *ctx,
1114 struct timespec *t, unsigned int *serial)
1116 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
1117 *t = CURRENT_TIME;
1118 *serial = audit_serial();
1122 /* Obtain an audit buffer. This routine does locking to obtain the
1123 * audit buffer, but then no locking is required for calls to
1124 * audit_log_*format. If the tsk is a task that is currently in a
1125 * syscall, then the syscall is marked as auditable and an audit record
1126 * will be written at syscall exit. If there is no associated task, tsk
1127 * should be NULL. */
1130 * audit_log_start - obtain an audit buffer
1131 * @ctx: audit_context (may be NULL)
1132 * @gfp_mask: type of allocation
1133 * @type: audit message type
1135 * Returns audit_buffer pointer on success or NULL on error.
1137 * Obtain an audit buffer. This routine does locking to obtain the
1138 * audit buffer, but then no locking is required for calls to
1139 * audit_log_*format. If the task (ctx) is a task that is currently in a
1140 * syscall, then the syscall is marked as auditable and an audit record
1141 * will be written at syscall exit. If there is no associated task, then
1142 * task context (ctx) should be NULL.
1144 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1145 int type)
1147 struct audit_buffer *ab = NULL;
1148 struct timespec t;
1149 unsigned int uninitialized_var(serial);
1150 int reserve;
1151 unsigned long timeout_start = jiffies;
1153 if (audit_initialized != AUDIT_INITIALIZED)
1154 return NULL;
1156 if (unlikely(audit_filter_type(type)))
1157 return NULL;
1159 if (gfp_mask & __GFP_WAIT)
1160 reserve = 0;
1161 else
1162 reserve = 5; /* Allow atomic callers to go up to five
1163 entries over the normal backlog limit */
1165 while (audit_backlog_limit
1166 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1167 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time
1168 && time_before(jiffies, timeout_start + audit_backlog_wait_time)) {
1170 /* Wait for auditd to drain the queue a little */
1171 DECLARE_WAITQUEUE(wait, current);
1172 set_current_state(TASK_INTERRUPTIBLE);
1173 add_wait_queue(&audit_backlog_wait, &wait);
1175 if (audit_backlog_limit &&
1176 skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
1177 schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies);
1179 __set_current_state(TASK_RUNNING);
1180 remove_wait_queue(&audit_backlog_wait, &wait);
1181 continue;
1183 if (audit_rate_check() && printk_ratelimit())
1184 printk(KERN_WARNING
1185 "audit: audit_backlog=%d > "
1186 "audit_backlog_limit=%d\n",
1187 skb_queue_len(&audit_skb_queue),
1188 audit_backlog_limit);
1189 audit_log_lost("backlog limit exceeded");
1190 audit_backlog_wait_time = audit_backlog_wait_overflow;
1191 wake_up(&audit_backlog_wait);
1192 return NULL;
1195 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1196 if (!ab) {
1197 audit_log_lost("out of memory in audit_log_start");
1198 return NULL;
1201 audit_get_stamp(ab->ctx, &t, &serial);
1203 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1204 t.tv_sec, t.tv_nsec/1000000, serial);
1205 return ab;
1209 * audit_expand - expand skb in the audit buffer
1210 * @ab: audit_buffer
1211 * @extra: space to add at tail of the skb
1213 * Returns 0 (no space) on failed expansion, or available space if
1214 * successful.
1216 static inline int audit_expand(struct audit_buffer *ab, int extra)
1218 struct sk_buff *skb = ab->skb;
1219 int oldtail = skb_tailroom(skb);
1220 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1221 int newtail = skb_tailroom(skb);
1223 if (ret < 0) {
1224 audit_log_lost("out of memory in audit_expand");
1225 return 0;
1228 skb->truesize += newtail - oldtail;
1229 return newtail;
1233 * Format an audit message into the audit buffer. If there isn't enough
1234 * room in the audit buffer, more room will be allocated and vsnprint
1235 * will be called a second time. Currently, we assume that a printk
1236 * can't format message larger than 1024 bytes, so we don't either.
1238 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1239 va_list args)
1241 int len, avail;
1242 struct sk_buff *skb;
1243 va_list args2;
1245 if (!ab)
1246 return;
1248 BUG_ON(!ab->skb);
1249 skb = ab->skb;
1250 avail = skb_tailroom(skb);
1251 if (avail == 0) {
1252 avail = audit_expand(ab, AUDIT_BUFSIZ);
1253 if (!avail)
1254 goto out;
1256 va_copy(args2, args);
1257 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1258 if (len >= avail) {
1259 /* The printk buffer is 1024 bytes long, so if we get
1260 * here and AUDIT_BUFSIZ is at least 1024, then we can
1261 * log everything that printk could have logged. */
1262 avail = audit_expand(ab,
1263 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1264 if (!avail)
1265 goto out;
1266 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1268 va_end(args2);
1269 if (len > 0)
1270 skb_put(skb, len);
1271 out:
1272 return;
1276 * audit_log_format - format a message into the audit buffer.
1277 * @ab: audit_buffer
1278 * @fmt: format string
1279 * @...: optional parameters matching @fmt string
1281 * All the work is done in audit_log_vformat.
1283 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1285 va_list args;
1287 if (!ab)
1288 return;
1289 va_start(args, fmt);
1290 audit_log_vformat(ab, fmt, args);
1291 va_end(args);
1295 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1296 * @ab: the audit_buffer
1297 * @buf: buffer to convert to hex
1298 * @len: length of @buf to be converted
1300 * No return value; failure to expand is silently ignored.
1302 * This function will take the passed buf and convert it into a string of
1303 * ascii hex digits. The new string is placed onto the skb.
1305 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1306 size_t len)
1308 int i, avail, new_len;
1309 unsigned char *ptr;
1310 struct sk_buff *skb;
1311 static const unsigned char *hex = "0123456789ABCDEF";
1313 if (!ab)
1314 return;
1316 BUG_ON(!ab->skb);
1317 skb = ab->skb;
1318 avail = skb_tailroom(skb);
1319 new_len = len<<1;
1320 if (new_len >= avail) {
1321 /* Round the buffer request up to the next multiple */
1322 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1323 avail = audit_expand(ab, new_len);
1324 if (!avail)
1325 return;
1328 ptr = skb_tail_pointer(skb);
1329 for (i=0; i<len; i++) {
1330 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
1331 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
1333 *ptr = 0;
1334 skb_put(skb, len << 1); /* new string is twice the old string */
1338 * Format a string of no more than slen characters into the audit buffer,
1339 * enclosed in quote marks.
1341 void audit_log_n_string(struct audit_buffer *ab, const char *string,
1342 size_t slen)
1344 int avail, new_len;
1345 unsigned char *ptr;
1346 struct sk_buff *skb;
1348 if (!ab)
1349 return;
1351 BUG_ON(!ab->skb);
1352 skb = ab->skb;
1353 avail = skb_tailroom(skb);
1354 new_len = slen + 3; /* enclosing quotes + null terminator */
1355 if (new_len > avail) {
1356 avail = audit_expand(ab, new_len);
1357 if (!avail)
1358 return;
1360 ptr = skb_tail_pointer(skb);
1361 *ptr++ = '"';
1362 memcpy(ptr, string, slen);
1363 ptr += slen;
1364 *ptr++ = '"';
1365 *ptr = 0;
1366 skb_put(skb, slen + 2); /* don't include null terminator */
1370 * audit_string_contains_control - does a string need to be logged in hex
1371 * @string: string to be checked
1372 * @len: max length of the string to check
1374 int audit_string_contains_control(const char *string, size_t len)
1376 const unsigned char *p;
1377 for (p = string; p < (const unsigned char *)string + len; p++) {
1378 if (*p == '"' || *p < 0x21 || *p > 0x7e)
1379 return 1;
1381 return 0;
1385 * audit_log_n_untrustedstring - log a string that may contain random characters
1386 * @ab: audit_buffer
1387 * @len: length of string (not including trailing null)
1388 * @string: string to be logged
1390 * This code will escape a string that is passed to it if the string
1391 * contains a control character, unprintable character, double quote mark,
1392 * or a space. Unescaped strings will start and end with a double quote mark.
1393 * Strings that are escaped are printed in hex (2 digits per char).
1395 * The caller specifies the number of characters in the string to log, which may
1396 * or may not be the entire string.
1398 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1399 size_t len)
1401 if (audit_string_contains_control(string, len))
1402 audit_log_n_hex(ab, string, len);
1403 else
1404 audit_log_n_string(ab, string, len);
1408 * audit_log_untrustedstring - log a string that may contain random characters
1409 * @ab: audit_buffer
1410 * @string: string to be logged
1412 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1413 * determine string length.
1415 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1417 audit_log_n_untrustedstring(ab, string, strlen(string));
1420 /* This is a helper-function to print the escaped d_path */
1421 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1422 struct path *path)
1424 char *p, *pathname;
1426 if (prefix)
1427 audit_log_format(ab, " %s", prefix);
1429 /* We will allow 11 spaces for ' (deleted)' to be appended */
1430 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1431 if (!pathname) {
1432 audit_log_string(ab, "<no_memory>");
1433 return;
1435 p = d_path(path, pathname, PATH_MAX+11);
1436 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
1437 /* FIXME: can we save some information here? */
1438 audit_log_string(ab, "<too_long>");
1439 } else
1440 audit_log_untrustedstring(ab, p);
1441 kfree(pathname);
1444 void audit_log_key(struct audit_buffer *ab, char *key)
1446 audit_log_format(ab, " key=");
1447 if (key)
1448 audit_log_untrustedstring(ab, key);
1449 else
1450 audit_log_format(ab, "(null)");
1454 * audit_log_end - end one audit record
1455 * @ab: the audit_buffer
1457 * The netlink_* functions cannot be called inside an irq context, so
1458 * the audit buffer is placed on a queue and a tasklet is scheduled to
1459 * remove them from the queue outside the irq context. May be called in
1460 * any context.
1462 void audit_log_end(struct audit_buffer *ab)
1464 if (!ab)
1465 return;
1466 if (!audit_rate_check()) {
1467 audit_log_lost("rate limit exceeded");
1468 } else {
1469 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1470 nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
1472 if (audit_pid) {
1473 skb_queue_tail(&audit_skb_queue, ab->skb);
1474 wake_up_interruptible(&kauditd_wait);
1475 } else {
1476 audit_printk_skb(ab->skb);
1478 ab->skb = NULL;
1480 audit_buffer_free(ab);
1484 * audit_log - Log an audit record
1485 * @ctx: audit context
1486 * @gfp_mask: type of allocation
1487 * @type: audit message type
1488 * @fmt: format string to use
1489 * @...: variable parameters matching the format string
1491 * This is a convenience function that calls audit_log_start,
1492 * audit_log_vformat, and audit_log_end. It may be called
1493 * in any context.
1495 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1496 const char *fmt, ...)
1498 struct audit_buffer *ab;
1499 va_list args;
1501 ab = audit_log_start(ctx, gfp_mask, type);
1502 if (ab) {
1503 va_start(args, fmt);
1504 audit_log_vformat(ab, fmt, args);
1505 va_end(args);
1506 audit_log_end(ab);
1510 EXPORT_SYMBOL(audit_log_start);
1511 EXPORT_SYMBOL(audit_log_end);
1512 EXPORT_SYMBOL(audit_log_format);
1513 EXPORT_SYMBOL(audit_log);