e1000e: fix skb truesize underestimation
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / audit.c
blob0a1355ca3d7927145d12bfeff3b62db138ccf124
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 <linux/atomic.h>
47 #include <linux/mm.h>
48 #include <linux/module.h>
49 #include <linux/slab.h>
50 #include <linux/err.h>
51 #include <linux/kthread.h>
53 #include <linux/audit.h>
55 #include <net/sock.h>
56 #include <net/netlink.h>
57 #include <linux/skbuff.h>
58 #ifdef CONFIG_SECURITY
59 #include <linux/security.h>
60 #endif
61 #include <linux/netlink.h>
62 #include <linux/freezer.h>
63 #include <linux/tty.h>
65 #include "audit.h"
67 /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
68 * (Initialization happens after skb_init is called.) */
69 #define AUDIT_DISABLED -1
70 #define AUDIT_UNINITIALIZED 0
71 #define AUDIT_INITIALIZED 1
72 static int audit_initialized;
74 #define AUDIT_OFF 0
75 #define AUDIT_ON 1
76 #define AUDIT_LOCKED 2
77 int audit_enabled;
78 int audit_ever_enabled;
80 EXPORT_SYMBOL_GPL(audit_enabled);
82 /* Default state when kernel boots without any parameters. */
83 static int audit_default;
85 /* If auditing cannot proceed, audit_failure selects what happens. */
86 static int audit_failure = AUDIT_FAIL_PRINTK;
89 * If audit records are to be written to the netlink socket, audit_pid
90 * contains the pid of the auditd process and audit_nlk_pid contains
91 * the pid to use to send netlink messages to that process.
93 int audit_pid;
94 static int audit_nlk_pid;
96 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
97 * to that number per second. This prevents DoS attacks, but results in
98 * audit records being dropped. */
99 static int audit_rate_limit;
101 /* Number of outstanding audit_buffers allowed. */
102 static int audit_backlog_limit = 64;
103 static int audit_backlog_wait_time = 60 * HZ;
104 static int audit_backlog_wait_overflow = 0;
106 /* The identity of the user shutting down the audit system. */
107 uid_t audit_sig_uid = -1;
108 pid_t audit_sig_pid = -1;
109 u32 audit_sig_sid = 0;
111 /* Records can be lost in several ways:
112 0) [suppressed in audit_alloc]
113 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
114 2) out of memory in audit_log_move [alloc_skb]
115 3) suppressed due to audit_rate_limit
116 4) suppressed due to audit_backlog_limit
118 static atomic_t audit_lost = ATOMIC_INIT(0);
120 /* The netlink socket. */
121 static struct sock *audit_sock;
123 /* Hash for inode-based rules */
124 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
126 /* The audit_freelist is a list of pre-allocated audit buffers (if more
127 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
128 * being placed on the freelist). */
129 static DEFINE_SPINLOCK(audit_freelist_lock);
130 static int audit_freelist_count;
131 static LIST_HEAD(audit_freelist);
133 static struct sk_buff_head audit_skb_queue;
134 /* queue of skbs to send to auditd when/if it comes back */
135 static struct sk_buff_head audit_skb_hold_queue;
136 static struct task_struct *kauditd_task;
137 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
138 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
140 /* Serialize requests from userspace. */
141 DEFINE_MUTEX(audit_cmd_mutex);
143 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
144 * audit records. Since printk uses a 1024 byte buffer, this buffer
145 * should be at least that large. */
146 #define AUDIT_BUFSIZ 1024
148 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
149 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
150 #define AUDIT_MAXFREE (2*NR_CPUS)
152 /* The audit_buffer is used when formatting an audit record. The caller
153 * locks briefly to get the record off the freelist or to allocate the
154 * buffer, and locks briefly to send the buffer to the netlink layer or
155 * to place it on a transmit queue. Multiple audit_buffers can be in
156 * use simultaneously. */
157 struct audit_buffer {
158 struct list_head list;
159 struct sk_buff *skb; /* formatted skb ready to send */
160 struct audit_context *ctx; /* NULL or associated context */
161 gfp_t gfp_mask;
164 struct audit_reply {
165 int pid;
166 struct sk_buff *skb;
169 static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
171 if (ab) {
172 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
173 nlh->nlmsg_pid = pid;
177 void audit_panic(const char *message)
179 switch (audit_failure)
181 case AUDIT_FAIL_SILENT:
182 break;
183 case AUDIT_FAIL_PRINTK:
184 if (printk_ratelimit())
185 printk(KERN_ERR "audit: %s\n", message);
186 break;
187 case AUDIT_FAIL_PANIC:
188 /* test audit_pid since printk is always losey, why bother? */
189 if (audit_pid)
190 panic("audit: %s\n", message);
191 break;
195 static inline int audit_rate_check(void)
197 static unsigned long last_check = 0;
198 static int messages = 0;
199 static DEFINE_SPINLOCK(lock);
200 unsigned long flags;
201 unsigned long now;
202 unsigned long elapsed;
203 int retval = 0;
205 if (!audit_rate_limit) return 1;
207 spin_lock_irqsave(&lock, flags);
208 if (++messages < audit_rate_limit) {
209 retval = 1;
210 } else {
211 now = jiffies;
212 elapsed = now - last_check;
213 if (elapsed > HZ) {
214 last_check = now;
215 messages = 0;
216 retval = 1;
219 spin_unlock_irqrestore(&lock, flags);
221 return retval;
225 * audit_log_lost - conditionally log lost audit message event
226 * @message: the message stating reason for lost audit message
228 * Emit at least 1 message per second, even if audit_rate_check is
229 * throttling.
230 * Always increment the lost messages counter.
232 void audit_log_lost(const char *message)
234 static unsigned long last_msg = 0;
235 static DEFINE_SPINLOCK(lock);
236 unsigned long flags;
237 unsigned long now;
238 int print;
240 atomic_inc(&audit_lost);
242 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
244 if (!print) {
245 spin_lock_irqsave(&lock, flags);
246 now = jiffies;
247 if (now - last_msg > HZ) {
248 print = 1;
249 last_msg = now;
251 spin_unlock_irqrestore(&lock, flags);
254 if (print) {
255 if (printk_ratelimit())
256 printk(KERN_WARNING
257 "audit: audit_lost=%d audit_rate_limit=%d "
258 "audit_backlog_limit=%d\n",
259 atomic_read(&audit_lost),
260 audit_rate_limit,
261 audit_backlog_limit);
262 audit_panic(message);
266 static int audit_log_config_change(char *function_name, int new, int old,
267 uid_t loginuid, u32 sessionid, u32 sid,
268 int allow_changes)
270 struct audit_buffer *ab;
271 int rc = 0;
273 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
274 audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new,
275 old, loginuid, sessionid);
276 if (sid) {
277 char *ctx = NULL;
278 u32 len;
280 rc = security_secid_to_secctx(sid, &ctx, &len);
281 if (rc) {
282 audit_log_format(ab, " sid=%u", sid);
283 allow_changes = 0; /* Something weird, deny request */
284 } else {
285 audit_log_format(ab, " subj=%s", ctx);
286 security_release_secctx(ctx, len);
289 audit_log_format(ab, " res=%d", allow_changes);
290 audit_log_end(ab);
291 return rc;
294 static int audit_do_config_change(char *function_name, int *to_change,
295 int new, uid_t loginuid, u32 sessionid,
296 u32 sid)
298 int allow_changes, rc = 0, old = *to_change;
300 /* check if we are locked */
301 if (audit_enabled == AUDIT_LOCKED)
302 allow_changes = 0;
303 else
304 allow_changes = 1;
306 if (audit_enabled != AUDIT_OFF) {
307 rc = audit_log_config_change(function_name, new, old, loginuid,
308 sessionid, sid, allow_changes);
309 if (rc)
310 allow_changes = 0;
313 /* If we are allowed, make the change */
314 if (allow_changes == 1)
315 *to_change = new;
316 /* Not allowed, update reason */
317 else if (rc == 0)
318 rc = -EPERM;
319 return rc;
322 static int audit_set_rate_limit(int limit, uid_t loginuid, u32 sessionid,
323 u32 sid)
325 return audit_do_config_change("audit_rate_limit", &audit_rate_limit,
326 limit, loginuid, sessionid, sid);
329 static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sessionid,
330 u32 sid)
332 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit,
333 limit, loginuid, sessionid, sid);
336 static int audit_set_enabled(int state, uid_t loginuid, u32 sessionid, u32 sid)
338 int rc;
339 if (state < AUDIT_OFF || state > AUDIT_LOCKED)
340 return -EINVAL;
342 rc = audit_do_config_change("audit_enabled", &audit_enabled, state,
343 loginuid, sessionid, sid);
345 if (!rc)
346 audit_ever_enabled |= !!state;
348 return rc;
351 static int audit_set_failure(int state, uid_t loginuid, u32 sessionid, u32 sid)
353 if (state != AUDIT_FAIL_SILENT
354 && state != AUDIT_FAIL_PRINTK
355 && state != AUDIT_FAIL_PANIC)
356 return -EINVAL;
358 return audit_do_config_change("audit_failure", &audit_failure, state,
359 loginuid, sessionid, sid);
363 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
364 * already have been sent via prink/syslog and so if these messages are dropped
365 * it is not a huge concern since we already passed the audit_log_lost()
366 * notification and stuff. This is just nice to get audit messages during
367 * boot before auditd is running or messages generated while auditd is stopped.
368 * This only holds messages is audit_default is set, aka booting with audit=1
369 * or building your kernel that way.
371 static void audit_hold_skb(struct sk_buff *skb)
373 if (audit_default &&
374 skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)
375 skb_queue_tail(&audit_skb_hold_queue, skb);
376 else
377 kfree_skb(skb);
381 * For one reason or another this nlh isn't getting delivered to the userspace
382 * audit daemon, just send it to printk.
384 static void audit_printk_skb(struct sk_buff *skb)
386 struct nlmsghdr *nlh = nlmsg_hdr(skb);
387 char *data = NLMSG_DATA(nlh);
389 if (nlh->nlmsg_type != AUDIT_EOE) {
390 if (printk_ratelimit())
391 printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data);
392 else
393 audit_log_lost("printk limit exceeded\n");
396 audit_hold_skb(skb);
399 static void kauditd_send_skb(struct sk_buff *skb)
401 int err;
402 /* take a reference in case we can't send it and we want to hold it */
403 skb_get(skb);
404 err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
405 if (err < 0) {
406 BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
407 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
408 audit_log_lost("auditd disappeared\n");
409 audit_pid = 0;
410 /* we might get lucky and get this in the next auditd */
411 audit_hold_skb(skb);
412 } else
413 /* drop the extra reference if sent ok */
414 consume_skb(skb);
417 static int kauditd_thread(void *dummy)
419 struct sk_buff *skb;
421 set_freezable();
422 while (!kthread_should_stop()) {
424 * if auditd just started drain the queue of messages already
425 * sent to syslog/printk. remember loss here is ok. we already
426 * called audit_log_lost() if it didn't go out normally. so the
427 * race between the skb_dequeue and the next check for audit_pid
428 * doesn't matter.
430 * if you ever find kauditd to be too slow we can get a perf win
431 * by doing our own locking and keeping better track if there
432 * are messages in this queue. I don't see the need now, but
433 * in 5 years when I want to play with this again I'll see this
434 * note and still have no friggin idea what i'm thinking today.
436 if (audit_default && audit_pid) {
437 skb = skb_dequeue(&audit_skb_hold_queue);
438 if (unlikely(skb)) {
439 while (skb && audit_pid) {
440 kauditd_send_skb(skb);
441 skb = skb_dequeue(&audit_skb_hold_queue);
446 skb = skb_dequeue(&audit_skb_queue);
447 wake_up(&audit_backlog_wait);
448 if (skb) {
449 if (audit_pid)
450 kauditd_send_skb(skb);
451 else
452 audit_printk_skb(skb);
453 } else {
454 DECLARE_WAITQUEUE(wait, current);
455 set_current_state(TASK_INTERRUPTIBLE);
456 add_wait_queue(&kauditd_wait, &wait);
458 if (!skb_queue_len(&audit_skb_queue)) {
459 try_to_freeze();
460 schedule();
463 __set_current_state(TASK_RUNNING);
464 remove_wait_queue(&kauditd_wait, &wait);
467 return 0;
470 static int audit_prepare_user_tty(pid_t pid, uid_t loginuid, u32 sessionid)
472 struct task_struct *tsk;
473 int err;
475 rcu_read_lock();
476 tsk = find_task_by_vpid(pid);
477 if (!tsk) {
478 rcu_read_unlock();
479 return -ESRCH;
481 get_task_struct(tsk);
482 rcu_read_unlock();
483 err = tty_audit_push_task(tsk, loginuid, sessionid);
484 put_task_struct(tsk);
485 return err;
488 int audit_send_list(void *_dest)
490 struct audit_netlink_list *dest = _dest;
491 int pid = dest->pid;
492 struct sk_buff *skb;
494 /* wait for parent to finish and send an ACK */
495 mutex_lock(&audit_cmd_mutex);
496 mutex_unlock(&audit_cmd_mutex);
498 while ((skb = __skb_dequeue(&dest->q)) != NULL)
499 netlink_unicast(audit_sock, skb, pid, 0);
501 kfree(dest);
503 return 0;
506 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
507 int multi, const void *payload, int size)
509 struct sk_buff *skb;
510 struct nlmsghdr *nlh;
511 void *data;
512 int flags = multi ? NLM_F_MULTI : 0;
513 int t = done ? NLMSG_DONE : type;
515 skb = nlmsg_new(size, GFP_KERNEL);
516 if (!skb)
517 return NULL;
519 nlh = NLMSG_NEW(skb, pid, seq, t, size, flags);
520 data = NLMSG_DATA(nlh);
521 memcpy(data, payload, size);
522 return skb;
524 nlmsg_failure: /* Used by NLMSG_NEW */
525 if (skb)
526 kfree_skb(skb);
527 return NULL;
530 static int audit_send_reply_thread(void *arg)
532 struct audit_reply *reply = (struct audit_reply *)arg;
534 mutex_lock(&audit_cmd_mutex);
535 mutex_unlock(&audit_cmd_mutex);
537 /* Ignore failure. It'll only happen if the sender goes away,
538 because our timeout is set to infinite. */
539 netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
540 kfree(reply);
541 return 0;
544 * audit_send_reply - send an audit reply message via netlink
545 * @pid: process id to send reply to
546 * @seq: sequence number
547 * @type: audit message type
548 * @done: done (last) flag
549 * @multi: multi-part message flag
550 * @payload: payload data
551 * @size: payload size
553 * Allocates an skb, builds the netlink message, and sends it to the pid.
554 * No failure notifications.
556 static void audit_send_reply(int pid, int seq, int type, int done, int multi,
557 const void *payload, int size)
559 struct sk_buff *skb;
560 struct task_struct *tsk;
561 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
562 GFP_KERNEL);
564 if (!reply)
565 return;
567 skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
568 if (!skb)
569 goto out;
571 reply->pid = pid;
572 reply->skb = skb;
574 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
575 if (!IS_ERR(tsk))
576 return;
577 kfree_skb(skb);
578 out:
579 kfree(reply);
583 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
584 * control messages.
586 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
588 int err = 0;
590 switch (msg_type) {
591 case AUDIT_GET:
592 case AUDIT_LIST:
593 case AUDIT_LIST_RULES:
594 case AUDIT_SET:
595 case AUDIT_ADD:
596 case AUDIT_ADD_RULE:
597 case AUDIT_DEL:
598 case AUDIT_DEL_RULE:
599 case AUDIT_SIGNAL_INFO:
600 case AUDIT_TTY_GET:
601 case AUDIT_TTY_SET:
602 case AUDIT_TRIM:
603 case AUDIT_MAKE_EQUIV:
604 if (security_netlink_recv(skb, CAP_AUDIT_CONTROL))
605 err = -EPERM;
606 break;
607 case AUDIT_USER:
608 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
609 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
610 if (security_netlink_recv(skb, CAP_AUDIT_WRITE))
611 err = -EPERM;
612 break;
613 default: /* bad msg */
614 err = -EINVAL;
617 return err;
620 static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
621 u32 pid, u32 uid, uid_t auid, u32 ses,
622 u32 sid)
624 int rc = 0;
625 char *ctx = NULL;
626 u32 len;
628 if (!audit_enabled) {
629 *ab = NULL;
630 return rc;
633 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
634 audit_log_format(*ab, "user pid=%d uid=%u auid=%u ses=%u",
635 pid, uid, auid, ses);
636 if (sid) {
637 rc = security_secid_to_secctx(sid, &ctx, &len);
638 if (rc)
639 audit_log_format(*ab, " ssid=%u", sid);
640 else {
641 audit_log_format(*ab, " subj=%s", ctx);
642 security_release_secctx(ctx, len);
646 return rc;
649 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
651 u32 uid, pid, seq, sid;
652 void *data;
653 struct audit_status *status_get, status_set;
654 int err;
655 struct audit_buffer *ab;
656 u16 msg_type = nlh->nlmsg_type;
657 uid_t loginuid; /* loginuid of sender */
658 u32 sessionid;
659 struct audit_sig_info *sig_data;
660 char *ctx = NULL;
661 u32 len;
663 err = audit_netlink_ok(skb, msg_type);
664 if (err)
665 return err;
667 /* As soon as there's any sign of userspace auditd,
668 * start kauditd to talk to it */
669 if (!kauditd_task)
670 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
671 if (IS_ERR(kauditd_task)) {
672 err = PTR_ERR(kauditd_task);
673 kauditd_task = NULL;
674 return err;
677 pid = NETLINK_CREDS(skb)->pid;
678 uid = NETLINK_CREDS(skb)->uid;
679 loginuid = audit_get_loginuid(current);
680 sessionid = audit_get_sessionid(current);
681 security_task_getsecid(current, &sid);
682 seq = nlh->nlmsg_seq;
683 data = NLMSG_DATA(nlh);
685 switch (msg_type) {
686 case AUDIT_GET:
687 status_set.enabled = audit_enabled;
688 status_set.failure = audit_failure;
689 status_set.pid = audit_pid;
690 status_set.rate_limit = audit_rate_limit;
691 status_set.backlog_limit = audit_backlog_limit;
692 status_set.lost = atomic_read(&audit_lost);
693 status_set.backlog = skb_queue_len(&audit_skb_queue);
694 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0,
695 &status_set, sizeof(status_set));
696 break;
697 case AUDIT_SET:
698 if (nlh->nlmsg_len < sizeof(struct audit_status))
699 return -EINVAL;
700 status_get = (struct audit_status *)data;
701 if (status_get->mask & AUDIT_STATUS_ENABLED) {
702 err = audit_set_enabled(status_get->enabled,
703 loginuid, sessionid, sid);
704 if (err < 0)
705 return err;
707 if (status_get->mask & AUDIT_STATUS_FAILURE) {
708 err = audit_set_failure(status_get->failure,
709 loginuid, sessionid, sid);
710 if (err < 0)
711 return err;
713 if (status_get->mask & AUDIT_STATUS_PID) {
714 int new_pid = status_get->pid;
716 if (audit_enabled != AUDIT_OFF)
717 audit_log_config_change("audit_pid", new_pid,
718 audit_pid, loginuid,
719 sessionid, sid, 1);
721 audit_pid = new_pid;
722 audit_nlk_pid = NETLINK_CB(skb).pid;
724 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
725 err = audit_set_rate_limit(status_get->rate_limit,
726 loginuid, sessionid, sid);
727 if (err < 0)
728 return err;
730 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
731 err = audit_set_backlog_limit(status_get->backlog_limit,
732 loginuid, sessionid, sid);
733 break;
734 case AUDIT_USER:
735 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
736 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
737 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
738 return 0;
740 err = audit_filter_user(&NETLINK_CB(skb));
741 if (err == 1) {
742 err = 0;
743 if (msg_type == AUDIT_USER_TTY) {
744 err = audit_prepare_user_tty(pid, loginuid,
745 sessionid);
746 if (err)
747 break;
749 audit_log_common_recv_msg(&ab, msg_type, pid, uid,
750 loginuid, sessionid, sid);
752 if (msg_type != AUDIT_USER_TTY)
753 audit_log_format(ab, " msg='%.1024s'",
754 (char *)data);
755 else {
756 int size;
758 audit_log_format(ab, " msg=");
759 size = nlmsg_len(nlh);
760 if (size > 0 &&
761 ((unsigned char *)data)[size - 1] == '\0')
762 size--;
763 audit_log_n_untrustedstring(ab, data, size);
765 audit_set_pid(ab, pid);
766 audit_log_end(ab);
768 break;
769 case AUDIT_ADD:
770 case AUDIT_DEL:
771 if (nlmsg_len(nlh) < sizeof(struct audit_rule))
772 return -EINVAL;
773 if (audit_enabled == AUDIT_LOCKED) {
774 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
775 uid, loginuid, sessionid, sid);
777 audit_log_format(ab, " audit_enabled=%d res=0",
778 audit_enabled);
779 audit_log_end(ab);
780 return -EPERM;
782 /* fallthrough */
783 case AUDIT_LIST:
784 err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
785 uid, seq, data, nlmsg_len(nlh),
786 loginuid, sessionid, sid);
787 break;
788 case AUDIT_ADD_RULE:
789 case AUDIT_DEL_RULE:
790 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
791 return -EINVAL;
792 if (audit_enabled == AUDIT_LOCKED) {
793 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
794 uid, loginuid, sessionid, sid);
796 audit_log_format(ab, " audit_enabled=%d res=0",
797 audit_enabled);
798 audit_log_end(ab);
799 return -EPERM;
801 /* fallthrough */
802 case AUDIT_LIST_RULES:
803 err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
804 uid, seq, data, nlmsg_len(nlh),
805 loginuid, sessionid, sid);
806 break;
807 case AUDIT_TRIM:
808 audit_trim_trees();
810 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
811 uid, loginuid, sessionid, sid);
813 audit_log_format(ab, " op=trim res=1");
814 audit_log_end(ab);
815 break;
816 case AUDIT_MAKE_EQUIV: {
817 void *bufp = data;
818 u32 sizes[2];
819 size_t msglen = nlmsg_len(nlh);
820 char *old, *new;
822 err = -EINVAL;
823 if (msglen < 2 * sizeof(u32))
824 break;
825 memcpy(sizes, bufp, 2 * sizeof(u32));
826 bufp += 2 * sizeof(u32);
827 msglen -= 2 * sizeof(u32);
828 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
829 if (IS_ERR(old)) {
830 err = PTR_ERR(old);
831 break;
833 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
834 if (IS_ERR(new)) {
835 err = PTR_ERR(new);
836 kfree(old);
837 break;
839 /* OK, here comes... */
840 err = audit_tag_tree(old, new);
842 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
843 uid, loginuid, sessionid, sid);
845 audit_log_format(ab, " op=make_equiv old=");
846 audit_log_untrustedstring(ab, old);
847 audit_log_format(ab, " new=");
848 audit_log_untrustedstring(ab, new);
849 audit_log_format(ab, " res=%d", !err);
850 audit_log_end(ab);
851 kfree(old);
852 kfree(new);
853 break;
855 case AUDIT_SIGNAL_INFO:
856 len = 0;
857 if (audit_sig_sid) {
858 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
859 if (err)
860 return err;
862 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
863 if (!sig_data) {
864 if (audit_sig_sid)
865 security_release_secctx(ctx, len);
866 return -ENOMEM;
868 sig_data->uid = audit_sig_uid;
869 sig_data->pid = audit_sig_pid;
870 if (audit_sig_sid) {
871 memcpy(sig_data->ctx, ctx, len);
872 security_release_secctx(ctx, len);
874 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO,
875 0, 0, sig_data, sizeof(*sig_data) + len);
876 kfree(sig_data);
877 break;
878 case AUDIT_TTY_GET: {
879 struct audit_tty_status s;
880 struct task_struct *tsk;
881 unsigned long flags;
883 rcu_read_lock();
884 tsk = find_task_by_vpid(pid);
885 if (tsk && lock_task_sighand(tsk, &flags)) {
886 s.enabled = tsk->signal->audit_tty != 0;
887 unlock_task_sighand(tsk, &flags);
888 } else
889 err = -ESRCH;
890 rcu_read_unlock();
892 if (!err)
893 audit_send_reply(NETLINK_CB(skb).pid, seq,
894 AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
895 break;
897 case AUDIT_TTY_SET: {
898 struct audit_tty_status *s;
899 struct task_struct *tsk;
900 unsigned long flags;
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 rcu_read_lock();
908 tsk = find_task_by_vpid(pid);
909 if (tsk && lock_task_sighand(tsk, &flags)) {
910 tsk->signal->audit_tty = s->enabled != 0;
911 unlock_task_sighand(tsk, &flags);
912 } else
913 err = -ESRCH;
914 rcu_read_unlock();
915 break;
917 default:
918 err = -EINVAL;
919 break;
922 return err < 0 ? err : 0;
926 * Get message from skb. Each message is processed by audit_receive_msg.
927 * Malformed skbs with wrong length are discarded silently.
929 static void audit_receive_skb(struct sk_buff *skb)
931 struct nlmsghdr *nlh;
933 * len MUST be signed for NLMSG_NEXT to be able to dec it below 0
934 * if the nlmsg_len was not aligned
936 int len;
937 int err;
939 nlh = nlmsg_hdr(skb);
940 len = skb->len;
942 while (NLMSG_OK(nlh, len)) {
943 err = audit_receive_msg(skb, nlh);
944 /* if err or if this message says it wants a response */
945 if (err || (nlh->nlmsg_flags & NLM_F_ACK))
946 netlink_ack(skb, nlh, err);
948 nlh = NLMSG_NEXT(nlh, len);
952 /* Receive messages from netlink socket. */
953 static void audit_receive(struct sk_buff *skb)
955 mutex_lock(&audit_cmd_mutex);
956 audit_receive_skb(skb);
957 mutex_unlock(&audit_cmd_mutex);
960 /* Initialize audit support at boot time. */
961 static int __init audit_init(void)
963 int i;
965 if (audit_initialized == AUDIT_DISABLED)
966 return 0;
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 = AUDIT_INITIALIZED;
980 audit_enabled = audit_default;
981 audit_ever_enabled |= !!audit_default;
983 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
985 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
986 INIT_LIST_HEAD(&audit_inode_hash[i]);
988 return 0;
990 __initcall(audit_init);
992 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
993 static int __init audit_enable(char *str)
995 audit_default = !!simple_strtol(str, NULL, 0);
996 if (!audit_default)
997 audit_initialized = AUDIT_DISABLED;
999 printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
1001 if (audit_initialized == AUDIT_INITIALIZED) {
1002 audit_enabled = audit_default;
1003 audit_ever_enabled |= !!audit_default;
1004 } else if (audit_initialized == AUDIT_UNINITIALIZED) {
1005 printk(" (after initialization)");
1006 } else {
1007 printk(" (until reboot)");
1009 printk("\n");
1011 return 1;
1014 __setup("audit=", audit_enable);
1016 static void audit_buffer_free(struct audit_buffer *ab)
1018 unsigned long flags;
1020 if (!ab)
1021 return;
1023 if (ab->skb)
1024 kfree_skb(ab->skb);
1026 spin_lock_irqsave(&audit_freelist_lock, flags);
1027 if (audit_freelist_count > AUDIT_MAXFREE)
1028 kfree(ab);
1029 else {
1030 audit_freelist_count++;
1031 list_add(&ab->list, &audit_freelist);
1033 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1036 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1037 gfp_t gfp_mask, int type)
1039 unsigned long flags;
1040 struct audit_buffer *ab = NULL;
1041 struct nlmsghdr *nlh;
1043 spin_lock_irqsave(&audit_freelist_lock, flags);
1044 if (!list_empty(&audit_freelist)) {
1045 ab = list_entry(audit_freelist.next,
1046 struct audit_buffer, list);
1047 list_del(&ab->list);
1048 --audit_freelist_count;
1050 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1052 if (!ab) {
1053 ab = kmalloc(sizeof(*ab), gfp_mask);
1054 if (!ab)
1055 goto err;
1058 ab->ctx = ctx;
1059 ab->gfp_mask = gfp_mask;
1061 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1062 if (!ab->skb)
1063 goto nlmsg_failure;
1065 nlh = NLMSG_NEW(ab->skb, 0, 0, type, 0, 0);
1067 return ab;
1069 nlmsg_failure: /* Used by NLMSG_NEW */
1070 kfree_skb(ab->skb);
1071 ab->skb = NULL;
1072 err:
1073 audit_buffer_free(ab);
1074 return NULL;
1078 * audit_serial - compute a serial number for the audit record
1080 * Compute a serial number for the audit record. Audit records are
1081 * written to user-space as soon as they are generated, so a complete
1082 * audit record may be written in several pieces. The timestamp of the
1083 * record and this serial number are used by the user-space tools to
1084 * determine which pieces belong to the same audit record. The
1085 * (timestamp,serial) tuple is unique for each syscall and is live from
1086 * syscall entry to syscall exit.
1088 * NOTE: Another possibility is to store the formatted records off the
1089 * audit context (for those records that have a context), and emit them
1090 * all at syscall exit. However, this could delay the reporting of
1091 * significant errors until syscall exit (or never, if the system
1092 * halts).
1094 unsigned int audit_serial(void)
1096 static DEFINE_SPINLOCK(serial_lock);
1097 static unsigned int serial = 0;
1099 unsigned long flags;
1100 unsigned int ret;
1102 spin_lock_irqsave(&serial_lock, flags);
1103 do {
1104 ret = ++serial;
1105 } while (unlikely(!ret));
1106 spin_unlock_irqrestore(&serial_lock, flags);
1108 return ret;
1111 static inline void audit_get_stamp(struct audit_context *ctx,
1112 struct timespec *t, unsigned int *serial)
1114 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
1115 *t = CURRENT_TIME;
1116 *serial = audit_serial();
1120 /* Obtain an audit buffer. This routine does locking to obtain the
1121 * audit buffer, but then no locking is required for calls to
1122 * audit_log_*format. If the tsk is a task that is currently in a
1123 * syscall, then the syscall is marked as auditable and an audit record
1124 * will be written at syscall exit. If there is no associated task, tsk
1125 * should be NULL. */
1128 * audit_log_start - obtain an audit buffer
1129 * @ctx: audit_context (may be NULL)
1130 * @gfp_mask: type of allocation
1131 * @type: audit message type
1133 * Returns audit_buffer pointer on success or NULL on error.
1135 * Obtain an audit buffer. This routine does locking to obtain the
1136 * audit buffer, but then no locking is required for calls to
1137 * audit_log_*format. If the task (ctx) is a task that is currently in a
1138 * syscall, then the syscall is marked as auditable and an audit record
1139 * will be written at syscall exit. If there is no associated task, then
1140 * task context (ctx) should be NULL.
1142 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1143 int type)
1145 struct audit_buffer *ab = NULL;
1146 struct timespec t;
1147 unsigned int uninitialized_var(serial);
1148 int reserve;
1149 unsigned long timeout_start = jiffies;
1151 if (audit_initialized != AUDIT_INITIALIZED)
1152 return NULL;
1154 if (unlikely(audit_filter_type(type)))
1155 return NULL;
1157 if (gfp_mask & __GFP_WAIT)
1158 reserve = 0;
1159 else
1160 reserve = 5; /* Allow atomic callers to go up to five
1161 entries over the normal backlog limit */
1163 while (audit_backlog_limit
1164 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1165 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time
1166 && time_before(jiffies, timeout_start + audit_backlog_wait_time)) {
1168 /* Wait for auditd to drain the queue a little */
1169 DECLARE_WAITQUEUE(wait, current);
1170 set_current_state(TASK_INTERRUPTIBLE);
1171 add_wait_queue(&audit_backlog_wait, &wait);
1173 if (audit_backlog_limit &&
1174 skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
1175 schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies);
1177 __set_current_state(TASK_RUNNING);
1178 remove_wait_queue(&audit_backlog_wait, &wait);
1179 continue;
1181 if (audit_rate_check() && printk_ratelimit())
1182 printk(KERN_WARNING
1183 "audit: audit_backlog=%d > "
1184 "audit_backlog_limit=%d\n",
1185 skb_queue_len(&audit_skb_queue),
1186 audit_backlog_limit);
1187 audit_log_lost("backlog limit exceeded");
1188 audit_backlog_wait_time = audit_backlog_wait_overflow;
1189 wake_up(&audit_backlog_wait);
1190 return NULL;
1193 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1194 if (!ab) {
1195 audit_log_lost("out of memory in audit_log_start");
1196 return NULL;
1199 audit_get_stamp(ab->ctx, &t, &serial);
1201 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1202 t.tv_sec, t.tv_nsec/1000000, serial);
1203 return ab;
1207 * audit_expand - expand skb in the audit buffer
1208 * @ab: audit_buffer
1209 * @extra: space to add at tail of the skb
1211 * Returns 0 (no space) on failed expansion, or available space if
1212 * successful.
1214 static inline int audit_expand(struct audit_buffer *ab, int extra)
1216 struct sk_buff *skb = ab->skb;
1217 int oldtail = skb_tailroom(skb);
1218 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1219 int newtail = skb_tailroom(skb);
1221 if (ret < 0) {
1222 audit_log_lost("out of memory in audit_expand");
1223 return 0;
1226 skb->truesize += newtail - oldtail;
1227 return newtail;
1231 * Format an audit message into the audit buffer. If there isn't enough
1232 * room in the audit buffer, more room will be allocated and vsnprint
1233 * will be called a second time. Currently, we assume that a printk
1234 * can't format message larger than 1024 bytes, so we don't either.
1236 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1237 va_list args)
1239 int len, avail;
1240 struct sk_buff *skb;
1241 va_list args2;
1243 if (!ab)
1244 return;
1246 BUG_ON(!ab->skb);
1247 skb = ab->skb;
1248 avail = skb_tailroom(skb);
1249 if (avail == 0) {
1250 avail = audit_expand(ab, AUDIT_BUFSIZ);
1251 if (!avail)
1252 goto out;
1254 va_copy(args2, args);
1255 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1256 if (len >= avail) {
1257 /* The printk buffer is 1024 bytes long, so if we get
1258 * here and AUDIT_BUFSIZ is at least 1024, then we can
1259 * log everything that printk could have logged. */
1260 avail = audit_expand(ab,
1261 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1262 if (!avail)
1263 goto out;
1264 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1266 va_end(args2);
1267 if (len > 0)
1268 skb_put(skb, len);
1269 out:
1270 return;
1274 * audit_log_format - format a message into the audit buffer.
1275 * @ab: audit_buffer
1276 * @fmt: format string
1277 * @...: optional parameters matching @fmt string
1279 * All the work is done in audit_log_vformat.
1281 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1283 va_list args;
1285 if (!ab)
1286 return;
1287 va_start(args, fmt);
1288 audit_log_vformat(ab, fmt, args);
1289 va_end(args);
1293 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1294 * @ab: the audit_buffer
1295 * @buf: buffer to convert to hex
1296 * @len: length of @buf to be converted
1298 * No return value; failure to expand is silently ignored.
1300 * This function will take the passed buf and convert it into a string of
1301 * ascii hex digits. The new string is placed onto the skb.
1303 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1304 size_t len)
1306 int i, avail, new_len;
1307 unsigned char *ptr;
1308 struct sk_buff *skb;
1309 static const unsigned char *hex = "0123456789ABCDEF";
1311 if (!ab)
1312 return;
1314 BUG_ON(!ab->skb);
1315 skb = ab->skb;
1316 avail = skb_tailroom(skb);
1317 new_len = len<<1;
1318 if (new_len >= avail) {
1319 /* Round the buffer request up to the next multiple */
1320 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1321 avail = audit_expand(ab, new_len);
1322 if (!avail)
1323 return;
1326 ptr = skb_tail_pointer(skb);
1327 for (i=0; i<len; i++) {
1328 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
1329 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
1331 *ptr = 0;
1332 skb_put(skb, len << 1); /* new string is twice the old string */
1336 * Format a string of no more than slen characters into the audit buffer,
1337 * enclosed in quote marks.
1339 void audit_log_n_string(struct audit_buffer *ab, const char *string,
1340 size_t slen)
1342 int avail, new_len;
1343 unsigned char *ptr;
1344 struct sk_buff *skb;
1346 if (!ab)
1347 return;
1349 BUG_ON(!ab->skb);
1350 skb = ab->skb;
1351 avail = skb_tailroom(skb);
1352 new_len = slen + 3; /* enclosing quotes + null terminator */
1353 if (new_len > avail) {
1354 avail = audit_expand(ab, new_len);
1355 if (!avail)
1356 return;
1358 ptr = skb_tail_pointer(skb);
1359 *ptr++ = '"';
1360 memcpy(ptr, string, slen);
1361 ptr += slen;
1362 *ptr++ = '"';
1363 *ptr = 0;
1364 skb_put(skb, slen + 2); /* don't include null terminator */
1368 * audit_string_contains_control - does a string need to be logged in hex
1369 * @string: string to be checked
1370 * @len: max length of the string to check
1372 int audit_string_contains_control(const char *string, size_t len)
1374 const unsigned char *p;
1375 for (p = string; p < (const unsigned char *)string + len; p++) {
1376 if (*p == '"' || *p < 0x21 || *p > 0x7e)
1377 return 1;
1379 return 0;
1383 * audit_log_n_untrustedstring - log a string that may contain random characters
1384 * @ab: audit_buffer
1385 * @len: length of string (not including trailing null)
1386 * @string: string to be logged
1388 * This code will escape a string that is passed to it if the string
1389 * contains a control character, unprintable character, double quote mark,
1390 * or a space. Unescaped strings will start and end with a double quote mark.
1391 * Strings that are escaped are printed in hex (2 digits per char).
1393 * The caller specifies the number of characters in the string to log, which may
1394 * or may not be the entire string.
1396 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1397 size_t len)
1399 if (audit_string_contains_control(string, len))
1400 audit_log_n_hex(ab, string, len);
1401 else
1402 audit_log_n_string(ab, string, len);
1406 * audit_log_untrustedstring - log a string that may contain random characters
1407 * @ab: audit_buffer
1408 * @string: string to be logged
1410 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1411 * determine string length.
1413 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1415 audit_log_n_untrustedstring(ab, string, strlen(string));
1418 /* This is a helper-function to print the escaped d_path */
1419 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1420 struct path *path)
1422 char *p, *pathname;
1424 if (prefix)
1425 audit_log_format(ab, " %s", prefix);
1427 /* We will allow 11 spaces for ' (deleted)' to be appended */
1428 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1429 if (!pathname) {
1430 audit_log_string(ab, "<no_memory>");
1431 return;
1433 p = d_path(path, pathname, PATH_MAX+11);
1434 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
1435 /* FIXME: can we save some information here? */
1436 audit_log_string(ab, "<too_long>");
1437 } else
1438 audit_log_untrustedstring(ab, p);
1439 kfree(pathname);
1442 void audit_log_key(struct audit_buffer *ab, char *key)
1444 audit_log_format(ab, " key=");
1445 if (key)
1446 audit_log_untrustedstring(ab, key);
1447 else
1448 audit_log_format(ab, "(null)");
1452 * audit_log_end - end one audit record
1453 * @ab: the audit_buffer
1455 * The netlink_* functions cannot be called inside an irq context, so
1456 * the audit buffer is placed on a queue and a tasklet is scheduled to
1457 * remove them from the queue outside the irq context. May be called in
1458 * any context.
1460 void audit_log_end(struct audit_buffer *ab)
1462 if (!ab)
1463 return;
1464 if (!audit_rate_check()) {
1465 audit_log_lost("rate limit exceeded");
1466 } else {
1467 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1468 nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
1470 if (audit_pid) {
1471 skb_queue_tail(&audit_skb_queue, ab->skb);
1472 wake_up_interruptible(&kauditd_wait);
1473 } else {
1474 audit_printk_skb(ab->skb);
1476 ab->skb = NULL;
1478 audit_buffer_free(ab);
1482 * audit_log - Log an audit record
1483 * @ctx: audit context
1484 * @gfp_mask: type of allocation
1485 * @type: audit message type
1486 * @fmt: format string to use
1487 * @...: variable parameters matching the format string
1489 * This is a convenience function that calls audit_log_start,
1490 * audit_log_vformat, and audit_log_end. It may be called
1491 * in any context.
1493 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1494 const char *fmt, ...)
1496 struct audit_buffer *ab;
1497 va_list args;
1499 ab = audit_log_start(ctx, gfp_mask, type);
1500 if (ab) {
1501 va_start(args, fmt);
1502 audit_log_vformat(ab, fmt, args);
1503 va_end(args);
1504 audit_log_end(ab);
1508 #ifdef CONFIG_SECURITY
1510 * audit_log_secctx - Converts and logs SELinux context
1511 * @ab: audit_buffer
1512 * @secid: security number
1514 * This is a helper function that calls security_secid_to_secctx to convert
1515 * secid to secctx and then adds the (converted) SELinux context to the audit
1516 * log by calling audit_log_format, thus also preventing leak of internal secid
1517 * to userspace. If secid cannot be converted audit_panic is called.
1519 void audit_log_secctx(struct audit_buffer *ab, u32 secid)
1521 u32 len;
1522 char *secctx;
1524 if (security_secid_to_secctx(secid, &secctx, &len)) {
1525 audit_panic("Cannot convert secid to context");
1526 } else {
1527 audit_log_format(ab, " obj=%s", secctx);
1528 security_release_secctx(secctx, len);
1531 EXPORT_SYMBOL(audit_log_secctx);
1532 #endif
1534 EXPORT_SYMBOL(audit_log_start);
1535 EXPORT_SYMBOL(audit_log_end);
1536 EXPORT_SYMBOL(audit_log_format);
1537 EXPORT_SYMBOL(audit_log);