xfrm: Fix kernel panic when flush and dump SPD entries
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / audit.c
blob4414e93d875018b89b6363e2821093c38600d776
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 != 0.
65 * (Initialization happens after skb_init is called.) */
66 static int audit_initialized;
68 #define AUDIT_OFF 0
69 #define AUDIT_ON 1
70 #define AUDIT_LOCKED 2
71 int audit_enabled;
72 int audit_ever_enabled;
74 /* Default state when kernel boots without any parameters. */
75 static int audit_default;
77 /* If auditing cannot proceed, audit_failure selects what happens. */
78 static int audit_failure = AUDIT_FAIL_PRINTK;
81 * If audit records are to be written to the netlink socket, audit_pid
82 * contains the pid of the auditd process and audit_nlk_pid contains
83 * the pid to use to send netlink messages to that process.
85 int audit_pid;
86 static int audit_nlk_pid;
88 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
89 * to that number per second. This prevents DoS attacks, but results in
90 * audit records being dropped. */
91 static int audit_rate_limit;
93 /* Number of outstanding audit_buffers allowed. */
94 static int audit_backlog_limit = 64;
95 static int audit_backlog_wait_time = 60 * HZ;
96 static int audit_backlog_wait_overflow = 0;
98 /* The identity of the user shutting down the audit system. */
99 uid_t audit_sig_uid = -1;
100 pid_t audit_sig_pid = -1;
101 u32 audit_sig_sid = 0;
103 /* Records can be lost in several ways:
104 0) [suppressed in audit_alloc]
105 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
106 2) out of memory in audit_log_move [alloc_skb]
107 3) suppressed due to audit_rate_limit
108 4) suppressed due to audit_backlog_limit
110 static atomic_t audit_lost = ATOMIC_INIT(0);
112 /* The netlink socket. */
113 static struct sock *audit_sock;
115 /* Inotify handle. */
116 struct inotify_handle *audit_ih;
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 static 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);
375 static void kauditd_send_skb(struct sk_buff *skb)
377 int err;
378 /* take a reference in case we can't send it and we want to hold it */
379 skb_get(skb);
380 err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
381 if (err < 0) {
382 BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */
383 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
384 audit_log_lost("auditd dissapeared\n");
385 audit_pid = 0;
386 /* we might get lucky and get this in the next auditd */
387 audit_hold_skb(skb);
388 } else
389 /* drop the extra reference if sent ok */
390 kfree_skb(skb);
393 static int kauditd_thread(void *dummy)
395 struct sk_buff *skb;
397 set_freezable();
398 while (!kthread_should_stop()) {
400 * if auditd just started drain the queue of messages already
401 * sent to syslog/printk. remember loss here is ok. we already
402 * called audit_log_lost() if it didn't go out normally. so the
403 * race between the skb_dequeue and the next check for audit_pid
404 * doesn't matter.
406 * if you ever find kauditd to be too slow we can get a perf win
407 * by doing our own locking and keeping better track if there
408 * are messages in this queue. I don't see the need now, but
409 * in 5 years when I want to play with this again I'll see this
410 * note and still have no friggin idea what i'm thinking today.
412 if (audit_default && audit_pid) {
413 skb = skb_dequeue(&audit_skb_hold_queue);
414 if (unlikely(skb)) {
415 while (skb && audit_pid) {
416 kauditd_send_skb(skb);
417 skb = skb_dequeue(&audit_skb_hold_queue);
422 skb = skb_dequeue(&audit_skb_queue);
423 wake_up(&audit_backlog_wait);
424 if (skb) {
425 if (audit_pid)
426 kauditd_send_skb(skb);
427 else {
428 if (printk_ratelimit())
429 printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0));
430 else
431 audit_log_lost("printk limit exceeded\n");
433 audit_hold_skb(skb);
435 } else {
436 DECLARE_WAITQUEUE(wait, current);
437 set_current_state(TASK_INTERRUPTIBLE);
438 add_wait_queue(&kauditd_wait, &wait);
440 if (!skb_queue_len(&audit_skb_queue)) {
441 try_to_freeze();
442 schedule();
445 __set_current_state(TASK_RUNNING);
446 remove_wait_queue(&kauditd_wait, &wait);
449 return 0;
452 static int audit_prepare_user_tty(pid_t pid, uid_t loginuid, u32 sessionid)
454 struct task_struct *tsk;
455 int err;
457 read_lock(&tasklist_lock);
458 tsk = find_task_by_vpid(pid);
459 err = -ESRCH;
460 if (!tsk)
461 goto out;
462 err = 0;
464 spin_lock_irq(&tsk->sighand->siglock);
465 if (!tsk->signal->audit_tty)
466 err = -EPERM;
467 spin_unlock_irq(&tsk->sighand->siglock);
468 if (err)
469 goto out;
471 tty_audit_push_task(tsk, loginuid, sessionid);
472 out:
473 read_unlock(&tasklist_lock);
474 return err;
477 int audit_send_list(void *_dest)
479 struct audit_netlink_list *dest = _dest;
480 int pid = dest->pid;
481 struct sk_buff *skb;
483 /* wait for parent to finish and send an ACK */
484 mutex_lock(&audit_cmd_mutex);
485 mutex_unlock(&audit_cmd_mutex);
487 while ((skb = __skb_dequeue(&dest->q)) != NULL)
488 netlink_unicast(audit_sock, skb, pid, 0);
490 kfree(dest);
492 return 0;
495 #ifdef CONFIG_AUDIT_TREE
496 static int prune_tree_thread(void *unused)
498 mutex_lock(&audit_cmd_mutex);
499 audit_prune_trees();
500 mutex_unlock(&audit_cmd_mutex);
501 return 0;
504 void audit_schedule_prune(void)
506 kthread_run(prune_tree_thread, NULL, "audit_prune_tree");
508 #endif
510 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
511 int multi, void *payload, int size)
513 struct sk_buff *skb;
514 struct nlmsghdr *nlh;
515 int len = NLMSG_SPACE(size);
516 void *data;
517 int flags = multi ? NLM_F_MULTI : 0;
518 int t = done ? NLMSG_DONE : type;
520 skb = alloc_skb(len, GFP_KERNEL);
521 if (!skb)
522 return NULL;
524 nlh = NLMSG_PUT(skb, pid, seq, t, size);
525 nlh->nlmsg_flags = flags;
526 data = NLMSG_DATA(nlh);
527 memcpy(data, payload, size);
528 return skb;
530 nlmsg_failure: /* Used by NLMSG_PUT */
531 if (skb)
532 kfree_skb(skb);
533 return NULL;
536 static int audit_send_reply_thread(void *arg)
538 struct audit_reply *reply = (struct audit_reply *)arg;
540 mutex_lock(&audit_cmd_mutex);
541 mutex_unlock(&audit_cmd_mutex);
543 /* Ignore failure. It'll only happen if the sender goes away,
544 because our timeout is set to infinite. */
545 netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
546 kfree(reply);
547 return 0;
550 * audit_send_reply - send an audit reply message via netlink
551 * @pid: process id to send reply to
552 * @seq: sequence number
553 * @type: audit message type
554 * @done: done (last) flag
555 * @multi: multi-part message flag
556 * @payload: payload data
557 * @size: payload size
559 * Allocates an skb, builds the netlink message, and sends it to the pid.
560 * No failure notifications.
562 void audit_send_reply(int pid, int seq, int type, int done, int multi,
563 void *payload, int size)
565 struct sk_buff *skb;
566 struct task_struct *tsk;
567 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
568 GFP_KERNEL);
570 if (!reply)
571 return;
573 skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
574 if (!skb)
575 goto out;
577 reply->pid = pid;
578 reply->skb = skb;
580 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
581 if (!IS_ERR(tsk))
582 return;
583 kfree_skb(skb);
584 out:
585 kfree(reply);
589 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
590 * control messages.
592 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
594 int err = 0;
596 switch (msg_type) {
597 case AUDIT_GET:
598 case AUDIT_LIST:
599 case AUDIT_LIST_RULES:
600 case AUDIT_SET:
601 case AUDIT_ADD:
602 case AUDIT_ADD_RULE:
603 case AUDIT_DEL:
604 case AUDIT_DEL_RULE:
605 case AUDIT_SIGNAL_INFO:
606 case AUDIT_TTY_GET:
607 case AUDIT_TTY_SET:
608 case AUDIT_TRIM:
609 case AUDIT_MAKE_EQUIV:
610 if (security_netlink_recv(skb, CAP_AUDIT_CONTROL))
611 err = -EPERM;
612 break;
613 case AUDIT_USER:
614 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
615 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
616 if (security_netlink_recv(skb, CAP_AUDIT_WRITE))
617 err = -EPERM;
618 break;
619 default: /* bad msg */
620 err = -EINVAL;
623 return err;
626 static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
627 u32 pid, u32 uid, uid_t auid, u32 ses,
628 u32 sid)
630 int rc = 0;
631 char *ctx = NULL;
632 u32 len;
634 if (!audit_enabled) {
635 *ab = NULL;
636 return rc;
639 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
640 audit_log_format(*ab, "user pid=%d uid=%u auid=%u ses=%u",
641 pid, uid, auid, ses);
642 if (sid) {
643 rc = security_secid_to_secctx(sid, &ctx, &len);
644 if (rc)
645 audit_log_format(*ab, " ssid=%u", sid);
646 else {
647 audit_log_format(*ab, " subj=%s", ctx);
648 security_release_secctx(ctx, len);
652 return rc;
655 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
657 u32 uid, pid, seq, sid;
658 void *data;
659 struct audit_status *status_get, status_set;
660 int err;
661 struct audit_buffer *ab;
662 u16 msg_type = nlh->nlmsg_type;
663 uid_t loginuid; /* loginuid of sender */
664 u32 sessionid;
665 struct audit_sig_info *sig_data;
666 char *ctx = NULL;
667 u32 len;
669 err = audit_netlink_ok(skb, msg_type);
670 if (err)
671 return err;
673 /* As soon as there's any sign of userspace auditd,
674 * start kauditd to talk to it */
675 if (!kauditd_task)
676 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
677 if (IS_ERR(kauditd_task)) {
678 err = PTR_ERR(kauditd_task);
679 kauditd_task = NULL;
680 return err;
683 pid = NETLINK_CREDS(skb)->pid;
684 uid = NETLINK_CREDS(skb)->uid;
685 loginuid = NETLINK_CB(skb).loginuid;
686 sessionid = NETLINK_CB(skb).sessionid;
687 sid = NETLINK_CB(skb).sid;
688 seq = nlh->nlmsg_seq;
689 data = NLMSG_DATA(nlh);
691 switch (msg_type) {
692 case AUDIT_GET:
693 status_set.enabled = audit_enabled;
694 status_set.failure = audit_failure;
695 status_set.pid = audit_pid;
696 status_set.rate_limit = audit_rate_limit;
697 status_set.backlog_limit = audit_backlog_limit;
698 status_set.lost = atomic_read(&audit_lost);
699 status_set.backlog = skb_queue_len(&audit_skb_queue);
700 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0,
701 &status_set, sizeof(status_set));
702 break;
703 case AUDIT_SET:
704 if (nlh->nlmsg_len < sizeof(struct audit_status))
705 return -EINVAL;
706 status_get = (struct audit_status *)data;
707 if (status_get->mask & AUDIT_STATUS_ENABLED) {
708 err = audit_set_enabled(status_get->enabled,
709 loginuid, sessionid, sid);
710 if (err < 0)
711 return err;
713 if (status_get->mask & AUDIT_STATUS_FAILURE) {
714 err = audit_set_failure(status_get->failure,
715 loginuid, sessionid, sid);
716 if (err < 0)
717 return err;
719 if (status_get->mask & AUDIT_STATUS_PID) {
720 int new_pid = status_get->pid;
722 if (audit_enabled != AUDIT_OFF)
723 audit_log_config_change("audit_pid", new_pid,
724 audit_pid, loginuid,
725 sessionid, sid, 1);
727 audit_pid = new_pid;
728 audit_nlk_pid = NETLINK_CB(skb).pid;
730 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
731 err = audit_set_rate_limit(status_get->rate_limit,
732 loginuid, sessionid, sid);
733 if (err < 0)
734 return err;
736 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
737 err = audit_set_backlog_limit(status_get->backlog_limit,
738 loginuid, sessionid, sid);
739 break;
740 case AUDIT_USER:
741 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
742 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
743 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
744 return 0;
746 err = audit_filter_user(&NETLINK_CB(skb));
747 if (err == 1) {
748 err = 0;
749 if (msg_type == AUDIT_USER_TTY) {
750 err = audit_prepare_user_tty(pid, loginuid,
751 sessionid);
752 if (err)
753 break;
755 audit_log_common_recv_msg(&ab, msg_type, pid, uid,
756 loginuid, sessionid, sid);
758 if (msg_type != AUDIT_USER_TTY)
759 audit_log_format(ab, " msg='%.1024s'",
760 (char *)data);
761 else {
762 int size;
764 audit_log_format(ab, " msg=");
765 size = nlmsg_len(nlh);
766 audit_log_n_untrustedstring(ab, data, size);
768 audit_set_pid(ab, pid);
769 audit_log_end(ab);
771 break;
772 case AUDIT_ADD:
773 case AUDIT_DEL:
774 if (nlmsg_len(nlh) < sizeof(struct audit_rule))
775 return -EINVAL;
776 if (audit_enabled == AUDIT_LOCKED) {
777 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
778 uid, loginuid, sessionid, sid);
780 audit_log_format(ab, " audit_enabled=%d res=0",
781 audit_enabled);
782 audit_log_end(ab);
783 return -EPERM;
785 /* fallthrough */
786 case AUDIT_LIST:
787 err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
788 uid, seq, data, nlmsg_len(nlh),
789 loginuid, sessionid, sid);
790 break;
791 case AUDIT_ADD_RULE:
792 case AUDIT_DEL_RULE:
793 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
794 return -EINVAL;
795 if (audit_enabled == AUDIT_LOCKED) {
796 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
797 uid, loginuid, sessionid, sid);
799 audit_log_format(ab, " audit_enabled=%d res=0",
800 audit_enabled);
801 audit_log_end(ab);
802 return -EPERM;
804 /* fallthrough */
805 case AUDIT_LIST_RULES:
806 err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
807 uid, seq, data, nlmsg_len(nlh),
808 loginuid, sessionid, sid);
809 break;
810 case AUDIT_TRIM:
811 audit_trim_trees();
813 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
814 uid, loginuid, sessionid, sid);
816 audit_log_format(ab, " op=trim res=1");
817 audit_log_end(ab);
818 break;
819 case AUDIT_MAKE_EQUIV: {
820 void *bufp = data;
821 u32 sizes[2];
822 size_t msglen = nlmsg_len(nlh);
823 char *old, *new;
825 err = -EINVAL;
826 if (msglen < 2 * sizeof(u32))
827 break;
828 memcpy(sizes, bufp, 2 * sizeof(u32));
829 bufp += 2 * sizeof(u32);
830 msglen -= 2 * sizeof(u32);
831 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
832 if (IS_ERR(old)) {
833 err = PTR_ERR(old);
834 break;
836 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
837 if (IS_ERR(new)) {
838 err = PTR_ERR(new);
839 kfree(old);
840 break;
842 /* OK, here comes... */
843 err = audit_tag_tree(old, new);
845 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
846 uid, loginuid, sessionid, sid);
848 audit_log_format(ab, " op=make_equiv old=");
849 audit_log_untrustedstring(ab, old);
850 audit_log_format(ab, " new=");
851 audit_log_untrustedstring(ab, new);
852 audit_log_format(ab, " res=%d", !err);
853 audit_log_end(ab);
854 kfree(old);
855 kfree(new);
856 break;
858 case AUDIT_SIGNAL_INFO:
859 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
860 if (err)
861 return err;
862 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
863 if (!sig_data) {
864 security_release_secctx(ctx, len);
865 return -ENOMEM;
867 sig_data->uid = audit_sig_uid;
868 sig_data->pid = audit_sig_pid;
869 memcpy(sig_data->ctx, ctx, len);
870 security_release_secctx(ctx, len);
871 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO,
872 0, 0, sig_data, sizeof(*sig_data) + len);
873 kfree(sig_data);
874 break;
875 case AUDIT_TTY_GET: {
876 struct audit_tty_status s;
877 struct task_struct *tsk;
879 read_lock(&tasklist_lock);
880 tsk = find_task_by_vpid(pid);
881 if (!tsk)
882 err = -ESRCH;
883 else {
884 spin_lock_irq(&tsk->sighand->siglock);
885 s.enabled = tsk->signal->audit_tty != 0;
886 spin_unlock_irq(&tsk->sighand->siglock);
888 read_unlock(&tasklist_lock);
889 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_TTY_GET, 0, 0,
890 &s, sizeof(s));
891 break;
893 case AUDIT_TTY_SET: {
894 struct audit_tty_status *s;
895 struct task_struct *tsk;
897 if (nlh->nlmsg_len < sizeof(struct audit_tty_status))
898 return -EINVAL;
899 s = data;
900 if (s->enabled != 0 && s->enabled != 1)
901 return -EINVAL;
902 read_lock(&tasklist_lock);
903 tsk = find_task_by_vpid(pid);
904 if (!tsk)
905 err = -ESRCH;
906 else {
907 spin_lock_irq(&tsk->sighand->siglock);
908 tsk->signal->audit_tty = s->enabled != 0;
909 spin_unlock_irq(&tsk->sighand->siglock);
911 read_unlock(&tasklist_lock);
912 break;
914 default:
915 err = -EINVAL;
916 break;
919 return err < 0 ? err : 0;
923 * Get message from skb (based on rtnetlink_rcv_skb). Each message is
924 * processed by audit_receive_msg. Malformed skbs with wrong length are
925 * discarded silently.
927 static void audit_receive_skb(struct sk_buff *skb)
929 int err;
930 struct nlmsghdr *nlh;
931 u32 rlen;
933 while (skb->len >= NLMSG_SPACE(0)) {
934 nlh = nlmsg_hdr(skb);
935 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
936 return;
937 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
938 if (rlen > skb->len)
939 rlen = skb->len;
940 if ((err = audit_receive_msg(skb, nlh))) {
941 netlink_ack(skb, nlh, err);
942 } else if (nlh->nlmsg_flags & NLM_F_ACK)
943 netlink_ack(skb, nlh, 0);
944 skb_pull(skb, rlen);
948 /* Receive messages from netlink socket. */
949 static void audit_receive(struct sk_buff *skb)
951 mutex_lock(&audit_cmd_mutex);
952 audit_receive_skb(skb);
953 mutex_unlock(&audit_cmd_mutex);
956 #ifdef CONFIG_AUDITSYSCALL
957 static const struct inotify_operations audit_inotify_ops = {
958 .handle_event = audit_handle_ievent,
959 .destroy_watch = audit_free_parent,
961 #endif
963 /* Initialize audit support at boot time. */
964 static int __init audit_init(void)
966 int i;
968 printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
969 audit_default ? "enabled" : "disabled");
970 audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, 0,
971 audit_receive, NULL, THIS_MODULE);
972 if (!audit_sock)
973 audit_panic("cannot initialize netlink socket");
974 else
975 audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
977 skb_queue_head_init(&audit_skb_queue);
978 skb_queue_head_init(&audit_skb_hold_queue);
979 audit_initialized = 1;
980 audit_enabled = audit_default;
981 audit_ever_enabled |= !!audit_default;
983 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
985 #ifdef CONFIG_AUDITSYSCALL
986 audit_ih = inotify_init(&audit_inotify_ops);
987 if (IS_ERR(audit_ih))
988 audit_panic("cannot initialize inotify handle");
989 #endif
991 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
992 INIT_LIST_HEAD(&audit_inode_hash[i]);
994 return 0;
996 __initcall(audit_init);
998 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
999 static int __init audit_enable(char *str)
1001 audit_default = !!simple_strtol(str, NULL, 0);
1002 printk(KERN_INFO "audit: %s%s\n",
1003 audit_default ? "enabled" : "disabled",
1004 audit_initialized ? "" : " (after initialization)");
1005 if (audit_initialized) {
1006 audit_enabled = audit_default;
1007 audit_ever_enabled |= !!audit_default;
1009 return 1;
1012 __setup("audit=", audit_enable);
1014 static void audit_buffer_free(struct audit_buffer *ab)
1016 unsigned long flags;
1018 if (!ab)
1019 return;
1021 if (ab->skb)
1022 kfree_skb(ab->skb);
1024 spin_lock_irqsave(&audit_freelist_lock, flags);
1025 if (audit_freelist_count > AUDIT_MAXFREE)
1026 kfree(ab);
1027 else {
1028 audit_freelist_count++;
1029 list_add(&ab->list, &audit_freelist);
1031 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1034 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1035 gfp_t gfp_mask, int type)
1037 unsigned long flags;
1038 struct audit_buffer *ab = NULL;
1039 struct nlmsghdr *nlh;
1041 spin_lock_irqsave(&audit_freelist_lock, flags);
1042 if (!list_empty(&audit_freelist)) {
1043 ab = list_entry(audit_freelist.next,
1044 struct audit_buffer, list);
1045 list_del(&ab->list);
1046 --audit_freelist_count;
1048 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1050 if (!ab) {
1051 ab = kmalloc(sizeof(*ab), gfp_mask);
1052 if (!ab)
1053 goto err;
1056 ab->skb = alloc_skb(AUDIT_BUFSIZ, gfp_mask);
1057 if (!ab->skb)
1058 goto err;
1060 ab->ctx = ctx;
1061 ab->gfp_mask = gfp_mask;
1062 nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0));
1063 nlh->nlmsg_type = type;
1064 nlh->nlmsg_flags = 0;
1065 nlh->nlmsg_pid = 0;
1066 nlh->nlmsg_seq = 0;
1067 return ab;
1068 err:
1069 audit_buffer_free(ab);
1070 return NULL;
1074 * audit_serial - compute a serial number for the audit record
1076 * Compute a serial number for the audit record. Audit records are
1077 * written to user-space as soon as they are generated, so a complete
1078 * audit record may be written in several pieces. The timestamp of the
1079 * record and this serial number are used by the user-space tools to
1080 * determine which pieces belong to the same audit record. The
1081 * (timestamp,serial) tuple is unique for each syscall and is live from
1082 * syscall entry to syscall exit.
1084 * NOTE: Another possibility is to store the formatted records off the
1085 * audit context (for those records that have a context), and emit them
1086 * all at syscall exit. However, this could delay the reporting of
1087 * significant errors until syscall exit (or never, if the system
1088 * halts).
1090 unsigned int audit_serial(void)
1092 static DEFINE_SPINLOCK(serial_lock);
1093 static unsigned int serial = 0;
1095 unsigned long flags;
1096 unsigned int ret;
1098 spin_lock_irqsave(&serial_lock, flags);
1099 do {
1100 ret = ++serial;
1101 } while (unlikely(!ret));
1102 spin_unlock_irqrestore(&serial_lock, flags);
1104 return ret;
1107 static inline void audit_get_stamp(struct audit_context *ctx,
1108 struct timespec *t, unsigned int *serial)
1110 if (ctx)
1111 auditsc_get_stamp(ctx, t, serial);
1112 else {
1113 *t = CURRENT_TIME;
1114 *serial = audit_serial();
1118 /* Obtain an audit buffer. This routine does locking to obtain the
1119 * audit buffer, but then no locking is required for calls to
1120 * audit_log_*format. If the tsk is a task that is currently in a
1121 * syscall, then the syscall is marked as auditable and an audit record
1122 * will be written at syscall exit. If there is no associated task, tsk
1123 * should be NULL. */
1126 * audit_log_start - obtain an audit buffer
1127 * @ctx: audit_context (may be NULL)
1128 * @gfp_mask: type of allocation
1129 * @type: audit message type
1131 * Returns audit_buffer pointer on success or NULL on error.
1133 * Obtain an audit buffer. This routine does locking to obtain the
1134 * audit buffer, but then no locking is required for calls to
1135 * audit_log_*format. If the task (ctx) is a task that is currently in a
1136 * syscall, then the syscall is marked as auditable and an audit record
1137 * will be written at syscall exit. If there is no associated task, then
1138 * task context (ctx) should be NULL.
1140 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1141 int type)
1143 struct audit_buffer *ab = NULL;
1144 struct timespec t;
1145 unsigned int uninitialized_var(serial);
1146 int reserve;
1147 unsigned long timeout_start = jiffies;
1149 if (!audit_initialized)
1150 return NULL;
1152 if (unlikely(audit_filter_type(type)))
1153 return NULL;
1155 if (gfp_mask & __GFP_WAIT)
1156 reserve = 0;
1157 else
1158 reserve = 5; /* Allow atomic callers to go up to five
1159 entries over the normal backlog limit */
1161 while (audit_backlog_limit
1162 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1163 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time
1164 && time_before(jiffies, timeout_start + audit_backlog_wait_time)) {
1166 /* Wait for auditd to drain the queue a little */
1167 DECLARE_WAITQUEUE(wait, current);
1168 set_current_state(TASK_INTERRUPTIBLE);
1169 add_wait_queue(&audit_backlog_wait, &wait);
1171 if (audit_backlog_limit &&
1172 skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
1173 schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies);
1175 __set_current_state(TASK_RUNNING);
1176 remove_wait_queue(&audit_backlog_wait, &wait);
1177 continue;
1179 if (audit_rate_check() && printk_ratelimit())
1180 printk(KERN_WARNING
1181 "audit: audit_backlog=%d > "
1182 "audit_backlog_limit=%d\n",
1183 skb_queue_len(&audit_skb_queue),
1184 audit_backlog_limit);
1185 audit_log_lost("backlog limit exceeded");
1186 audit_backlog_wait_time = audit_backlog_wait_overflow;
1187 wake_up(&audit_backlog_wait);
1188 return NULL;
1191 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1192 if (!ab) {
1193 audit_log_lost("out of memory in audit_log_start");
1194 return NULL;
1197 audit_get_stamp(ab->ctx, &t, &serial);
1199 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1200 t.tv_sec, t.tv_nsec/1000000, serial);
1201 return ab;
1205 * audit_expand - expand skb in the audit buffer
1206 * @ab: audit_buffer
1207 * @extra: space to add at tail of the skb
1209 * Returns 0 (no space) on failed expansion, or available space if
1210 * successful.
1212 static inline int audit_expand(struct audit_buffer *ab, int extra)
1214 struct sk_buff *skb = ab->skb;
1215 int oldtail = skb_tailroom(skb);
1216 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1217 int newtail = skb_tailroom(skb);
1219 if (ret < 0) {
1220 audit_log_lost("out of memory in audit_expand");
1221 return 0;
1224 skb->truesize += newtail - oldtail;
1225 return newtail;
1229 * Format an audit message into the audit buffer. If there isn't enough
1230 * room in the audit buffer, more room will be allocated and vsnprint
1231 * will be called a second time. Currently, we assume that a printk
1232 * can't format message larger than 1024 bytes, so we don't either.
1234 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1235 va_list args)
1237 int len, avail;
1238 struct sk_buff *skb;
1239 va_list args2;
1241 if (!ab)
1242 return;
1244 BUG_ON(!ab->skb);
1245 skb = ab->skb;
1246 avail = skb_tailroom(skb);
1247 if (avail == 0) {
1248 avail = audit_expand(ab, AUDIT_BUFSIZ);
1249 if (!avail)
1250 goto out;
1252 va_copy(args2, args);
1253 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1254 if (len >= avail) {
1255 /* The printk buffer is 1024 bytes long, so if we get
1256 * here and AUDIT_BUFSIZ is at least 1024, then we can
1257 * log everything that printk could have logged. */
1258 avail = audit_expand(ab,
1259 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1260 if (!avail)
1261 goto out;
1262 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1264 va_end(args2);
1265 if (len > 0)
1266 skb_put(skb, len);
1267 out:
1268 return;
1272 * audit_log_format - format a message into the audit buffer.
1273 * @ab: audit_buffer
1274 * @fmt: format string
1275 * @...: optional parameters matching @fmt string
1277 * All the work is done in audit_log_vformat.
1279 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1281 va_list args;
1283 if (!ab)
1284 return;
1285 va_start(args, fmt);
1286 audit_log_vformat(ab, fmt, args);
1287 va_end(args);
1291 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1292 * @ab: the audit_buffer
1293 * @buf: buffer to convert to hex
1294 * @len: length of @buf to be converted
1296 * No return value; failure to expand is silently ignored.
1298 * This function will take the passed buf and convert it into a string of
1299 * ascii hex digits. The new string is placed onto the skb.
1301 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1302 size_t len)
1304 int i, avail, new_len;
1305 unsigned char *ptr;
1306 struct sk_buff *skb;
1307 static const unsigned char *hex = "0123456789ABCDEF";
1309 if (!ab)
1310 return;
1312 BUG_ON(!ab->skb);
1313 skb = ab->skb;
1314 avail = skb_tailroom(skb);
1315 new_len = len<<1;
1316 if (new_len >= avail) {
1317 /* Round the buffer request up to the next multiple */
1318 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1319 avail = audit_expand(ab, new_len);
1320 if (!avail)
1321 return;
1324 ptr = skb_tail_pointer(skb);
1325 for (i=0; i<len; i++) {
1326 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
1327 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
1329 *ptr = 0;
1330 skb_put(skb, len << 1); /* new string is twice the old string */
1334 * Format a string of no more than slen characters into the audit buffer,
1335 * enclosed in quote marks.
1337 void audit_log_n_string(struct audit_buffer *ab, const char *string,
1338 size_t slen)
1340 int avail, new_len;
1341 unsigned char *ptr;
1342 struct sk_buff *skb;
1344 if (!ab)
1345 return;
1347 BUG_ON(!ab->skb);
1348 skb = ab->skb;
1349 avail = skb_tailroom(skb);
1350 new_len = slen + 3; /* enclosing quotes + null terminator */
1351 if (new_len > avail) {
1352 avail = audit_expand(ab, new_len);
1353 if (!avail)
1354 return;
1356 ptr = skb_tail_pointer(skb);
1357 *ptr++ = '"';
1358 memcpy(ptr, string, slen);
1359 ptr += slen;
1360 *ptr++ = '"';
1361 *ptr = 0;
1362 skb_put(skb, slen + 2); /* don't include null terminator */
1366 * audit_string_contains_control - does a string need to be logged in hex
1367 * @string: string to be checked
1368 * @len: max length of the string to check
1370 int audit_string_contains_control(const char *string, size_t len)
1372 const unsigned char *p;
1373 for (p = string; p < (const unsigned char *)string + len && *p; p++) {
1374 if (*p == '"' || *p < 0x21 || *p > 0x7e)
1375 return 1;
1377 return 0;
1381 * audit_log_n_untrustedstring - log a string that may contain random characters
1382 * @ab: audit_buffer
1383 * @len: length of string (not including trailing null)
1384 * @string: string to be logged
1386 * This code will escape a string that is passed to it if the string
1387 * contains a control character, unprintable character, double quote mark,
1388 * or a space. Unescaped strings will start and end with a double quote mark.
1389 * Strings that are escaped are printed in hex (2 digits per char).
1391 * The caller specifies the number of characters in the string to log, which may
1392 * or may not be the entire string.
1394 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1395 size_t len)
1397 if (audit_string_contains_control(string, len))
1398 audit_log_n_hex(ab, string, len);
1399 else
1400 audit_log_n_string(ab, string, len);
1404 * audit_log_untrustedstring - log a string that may contain random characters
1405 * @ab: audit_buffer
1406 * @string: string to be logged
1408 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1409 * determine string length.
1411 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1413 audit_log_n_untrustedstring(ab, string, strlen(string));
1416 /* This is a helper-function to print the escaped d_path */
1417 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1418 struct path *path)
1420 char *p, *pathname;
1422 if (prefix)
1423 audit_log_format(ab, " %s", prefix);
1425 /* We will allow 11 spaces for ' (deleted)' to be appended */
1426 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1427 if (!pathname) {
1428 audit_log_format(ab, "<no memory>");
1429 return;
1431 p = d_path(path, pathname, PATH_MAX+11);
1432 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
1433 /* FIXME: can we save some information here? */
1434 audit_log_format(ab, "<too long>");
1435 } else
1436 audit_log_untrustedstring(ab, p);
1437 kfree(pathname);
1441 * audit_log_end - end one audit record
1442 * @ab: the audit_buffer
1444 * The netlink_* functions cannot be called inside an irq context, so
1445 * the audit buffer is placed on a queue and a tasklet is scheduled to
1446 * remove them from the queue outside the irq context. May be called in
1447 * any context.
1449 void audit_log_end(struct audit_buffer *ab)
1451 if (!ab)
1452 return;
1453 if (!audit_rate_check()) {
1454 audit_log_lost("rate limit exceeded");
1455 } else {
1456 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1457 nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
1459 if (audit_pid) {
1460 skb_queue_tail(&audit_skb_queue, ab->skb);
1461 wake_up_interruptible(&kauditd_wait);
1462 } else {
1463 if (nlh->nlmsg_type != AUDIT_EOE) {
1464 if (printk_ratelimit()) {
1465 printk(KERN_NOTICE "type=%d %s\n",
1466 nlh->nlmsg_type,
1467 ab->skb->data + NLMSG_SPACE(0));
1468 } else
1469 audit_log_lost("printk limit exceeded\n");
1471 audit_hold_skb(ab->skb);
1473 ab->skb = NULL;
1475 audit_buffer_free(ab);
1479 * audit_log - Log an audit record
1480 * @ctx: audit context
1481 * @gfp_mask: type of allocation
1482 * @type: audit message type
1483 * @fmt: format string to use
1484 * @...: variable parameters matching the format string
1486 * This is a convenience function that calls audit_log_start,
1487 * audit_log_vformat, and audit_log_end. It may be called
1488 * in any context.
1490 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1491 const char *fmt, ...)
1493 struct audit_buffer *ab;
1494 va_list args;
1496 ab = audit_log_start(ctx, gfp_mask, type);
1497 if (ab) {
1498 va_start(args, fmt);
1499 audit_log_vformat(ab, fmt, args);
1500 va_end(args);
1501 audit_log_end(ab);
1505 EXPORT_SYMBOL(audit_log_start);
1506 EXPORT_SYMBOL(audit_log_end);
1507 EXPORT_SYMBOL(audit_log_format);
1508 EXPORT_SYMBOL(audit_log);