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.
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
30 * i) context is allocated,
31 * ii) names from getname are stored without a copy, and
32 * iii) inode information stored from path_lookup.
33 * 3) Ability to disable syscall auditing at boot time (audit=0).
34 * 4) Usable by other parts of the kernel (if audit_log* is called,
35 * then a syscall record will be generated automatically for the
37 * 5) Netlink interface to user-space.
38 * 6) Support low-overhead kernel-based filtering to minimize the
39 * information that must be passed to user-space.
41 * Example user-space utilities: http://people.redhat.com/sgrubb/audit/
44 #include <linux/init.h>
45 #include <asm/types.h>
46 #include <linux/atomic.h>
48 #include <linux/export.h>
49 #include <linux/slab.h>
50 #include <linux/err.h>
51 #include <linux/kthread.h>
52 #include <linux/kernel.h>
53 #include <linux/syscalls.h>
55 #include <linux/audit.h>
58 #include <net/netlink.h>
59 #include <linux/skbuff.h>
60 #ifdef CONFIG_SECURITY
61 #include <linux/security.h>
63 #include <linux/freezer.h>
64 #include <linux/tty.h>
65 #include <linux/pid_namespace.h>
69 /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
70 * (Initialization happens after skb_init is called.) */
71 #define AUDIT_DISABLED -1
72 #define AUDIT_UNINITIALIZED 0
73 #define AUDIT_INITIALIZED 1
74 static int audit_initialized;
78 #define AUDIT_LOCKED 2
80 int audit_ever_enabled;
82 EXPORT_SYMBOL_GPL(audit_enabled);
84 /* Default state when kernel boots without any parameters. */
85 static int audit_default;
87 /* If auditing cannot proceed, audit_failure selects what happens. */
88 static int audit_failure = AUDIT_FAIL_PRINTK;
91 * If audit records are to be written to the netlink socket, audit_pid
92 * contains the pid of the auditd process and audit_nlk_portid contains
93 * the portid to use to send netlink messages to that process.
96 static int audit_nlk_portid;
98 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
99 * to that number per second. This prevents DoS attacks, but results in
100 * audit records being dropped. */
101 static int audit_rate_limit;
103 /* Number of outstanding audit_buffers allowed. */
104 static int audit_backlog_limit = 64;
105 static int audit_backlog_wait_time = 60 * HZ;
106 static int audit_backlog_wait_overflow = 0;
108 /* The identity of the user shutting down the audit system. */
109 kuid_t audit_sig_uid = INVALID_UID;
110 pid_t audit_sig_pid = -1;
111 u32 audit_sig_sid = 0;
113 /* Records can be lost in several ways:
114 0) [suppressed in audit_alloc]
115 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
116 2) out of memory in audit_log_move [alloc_skb]
117 3) suppressed due to audit_rate_limit
118 4) suppressed due to audit_backlog_limit
120 static atomic_t audit_lost = ATOMIC_INIT(0);
122 /* The netlink socket. */
123 static struct sock *audit_sock;
125 /* Hash for inode-based rules */
126 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
128 /* The audit_freelist is a list of pre-allocated audit buffers (if more
129 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
130 * being placed on the freelist). */
131 static DEFINE_SPINLOCK(audit_freelist_lock);
132 static int audit_freelist_count;
133 static LIST_HEAD(audit_freelist);
135 static struct sk_buff_head audit_skb_queue;
136 /* queue of skbs to send to auditd when/if it comes back */
137 static struct sk_buff_head audit_skb_hold_queue;
138 static struct task_struct *kauditd_task;
139 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
140 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
142 static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION,
147 static char *audit_feature_names[0] = {
151 /* Serialize requests from userspace. */
152 DEFINE_MUTEX(audit_cmd_mutex);
154 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
155 * audit records. Since printk uses a 1024 byte buffer, this buffer
156 * should be at least that large. */
157 #define AUDIT_BUFSIZ 1024
159 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
160 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
161 #define AUDIT_MAXFREE (2*NR_CPUS)
163 /* The audit_buffer is used when formatting an audit record. The caller
164 * locks briefly to get the record off the freelist or to allocate the
165 * buffer, and locks briefly to send the buffer to the netlink layer or
166 * to place it on a transmit queue. Multiple audit_buffers can be in
167 * use simultaneously. */
168 struct audit_buffer {
169 struct list_head list;
170 struct sk_buff *skb; /* formatted skb ready to send */
171 struct audit_context *ctx; /* NULL or associated context */
180 static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
183 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
184 nlh->nlmsg_pid = pid;
188 void audit_panic(const char *message)
190 switch (audit_failure)
192 case AUDIT_FAIL_SILENT:
194 case AUDIT_FAIL_PRINTK:
195 if (printk_ratelimit())
196 printk(KERN_ERR "audit: %s\n", message);
198 case AUDIT_FAIL_PANIC:
199 /* test audit_pid since printk is always losey, why bother? */
201 panic("audit: %s\n", message);
206 static inline int audit_rate_check(void)
208 static unsigned long last_check = 0;
209 static int messages = 0;
210 static DEFINE_SPINLOCK(lock);
213 unsigned long elapsed;
216 if (!audit_rate_limit) return 1;
218 spin_lock_irqsave(&lock, flags);
219 if (++messages < audit_rate_limit) {
223 elapsed = now - last_check;
230 spin_unlock_irqrestore(&lock, flags);
236 * audit_log_lost - conditionally log lost audit message event
237 * @message: the message stating reason for lost audit message
239 * Emit at least 1 message per second, even if audit_rate_check is
241 * Always increment the lost messages counter.
243 void audit_log_lost(const char *message)
245 static unsigned long last_msg = 0;
246 static DEFINE_SPINLOCK(lock);
251 atomic_inc(&audit_lost);
253 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
256 spin_lock_irqsave(&lock, flags);
258 if (now - last_msg > HZ) {
262 spin_unlock_irqrestore(&lock, flags);
266 if (printk_ratelimit())
268 "audit: audit_lost=%d audit_rate_limit=%d "
269 "audit_backlog_limit=%d\n",
270 atomic_read(&audit_lost),
272 audit_backlog_limit);
273 audit_panic(message);
277 static int audit_log_config_change(char *function_name, int new, int old,
280 struct audit_buffer *ab;
283 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
286 audit_log_format(ab, "%s=%d old=%d", function_name, new, old);
287 audit_log_session_info(ab);
288 rc = audit_log_task_context(ab);
290 allow_changes = 0; /* Something weird, deny request */
291 audit_log_format(ab, " res=%d", allow_changes);
296 static int audit_do_config_change(char *function_name, int *to_change, int new)
298 int allow_changes, rc = 0, old = *to_change;
300 /* check if we are locked */
301 if (audit_enabled == AUDIT_LOCKED)
306 if (audit_enabled != AUDIT_OFF) {
307 rc = audit_log_config_change(function_name, new, old, allow_changes);
312 /* If we are allowed, make the change */
313 if (allow_changes == 1)
315 /* Not allowed, update reason */
321 static int audit_set_rate_limit(int limit)
323 return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);
326 static int audit_set_backlog_limit(int limit)
328 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
331 static int audit_set_enabled(int state)
334 if (state < AUDIT_OFF || state > AUDIT_LOCKED)
337 rc = audit_do_config_change("audit_enabled", &audit_enabled, state);
339 audit_ever_enabled |= !!state;
344 static int audit_set_failure(int state)
346 if (state != AUDIT_FAIL_SILENT
347 && state != AUDIT_FAIL_PRINTK
348 && state != AUDIT_FAIL_PANIC)
351 return audit_do_config_change("audit_failure", &audit_failure, state);
355 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
356 * already have been sent via prink/syslog and so if these messages are dropped
357 * it is not a huge concern since we already passed the audit_log_lost()
358 * notification and stuff. This is just nice to get audit messages during
359 * boot before auditd is running or messages generated while auditd is stopped.
360 * This only holds messages is audit_default is set, aka booting with audit=1
361 * or building your kernel that way.
363 static void audit_hold_skb(struct sk_buff *skb)
366 skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)
367 skb_queue_tail(&audit_skb_hold_queue, skb);
373 * For one reason or another this nlh isn't getting delivered to the userspace
374 * audit daemon, just send it to printk.
376 static void audit_printk_skb(struct sk_buff *skb)
378 struct nlmsghdr *nlh = nlmsg_hdr(skb);
379 char *data = nlmsg_data(nlh);
381 if (nlh->nlmsg_type != AUDIT_EOE) {
382 if (printk_ratelimit())
383 printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data);
385 audit_log_lost("printk limit exceeded\n");
391 static void kauditd_send_skb(struct sk_buff *skb)
394 /* take a reference in case we can't send it and we want to hold it */
396 err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
398 BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
399 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
400 audit_log_lost("auditd disappeared\n");
402 /* we might get lucky and get this in the next auditd */
405 /* drop the extra reference if sent ok */
410 * flush_hold_queue - empty the hold queue if auditd appears
412 * If auditd just started, drain the queue of messages already
413 * sent to syslog/printk. Remember loss here is ok. We already
414 * called audit_log_lost() if it didn't go out normally. so the
415 * race between the skb_dequeue and the next check for audit_pid
418 * If you ever find kauditd to be too slow we can get a perf win
419 * by doing our own locking and keeping better track if there
420 * are messages in this queue. I don't see the need now, but
421 * in 5 years when I want to play with this again I'll see this
422 * note and still have no friggin idea what i'm thinking today.
424 static void flush_hold_queue(void)
428 if (!audit_default || !audit_pid)
431 skb = skb_dequeue(&audit_skb_hold_queue);
435 while (skb && audit_pid) {
436 kauditd_send_skb(skb);
437 skb = skb_dequeue(&audit_skb_hold_queue);
441 * if auditd just disappeared but we
442 * dequeued an skb we need to drop ref
448 static int kauditd_thread(void *dummy)
451 while (!kthread_should_stop()) {
453 DECLARE_WAITQUEUE(wait, current);
457 skb = skb_dequeue(&audit_skb_queue);
458 wake_up(&audit_backlog_wait);
461 kauditd_send_skb(skb);
463 audit_printk_skb(skb);
466 set_current_state(TASK_INTERRUPTIBLE);
467 add_wait_queue(&kauditd_wait, &wait);
469 if (!skb_queue_len(&audit_skb_queue)) {
474 __set_current_state(TASK_RUNNING);
475 remove_wait_queue(&kauditd_wait, &wait);
480 int audit_send_list(void *_dest)
482 struct audit_netlink_list *dest = _dest;
486 /* wait for parent to finish and send an ACK */
487 mutex_lock(&audit_cmd_mutex);
488 mutex_unlock(&audit_cmd_mutex);
490 while ((skb = __skb_dequeue(&dest->q)) != NULL)
491 netlink_unicast(audit_sock, skb, pid, 0);
498 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
499 int multi, const void *payload, int size)
502 struct nlmsghdr *nlh;
504 int flags = multi ? NLM_F_MULTI : 0;
505 int t = done ? NLMSG_DONE : type;
507 skb = nlmsg_new(size, GFP_KERNEL);
511 nlh = nlmsg_put(skb, pid, seq, t, size, flags);
514 data = nlmsg_data(nlh);
515 memcpy(data, payload, size);
523 static int audit_send_reply_thread(void *arg)
525 struct audit_reply *reply = (struct audit_reply *)arg;
527 mutex_lock(&audit_cmd_mutex);
528 mutex_unlock(&audit_cmd_mutex);
530 /* Ignore failure. It'll only happen if the sender goes away,
531 because our timeout is set to infinite. */
532 netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
537 * audit_send_reply - send an audit reply message via netlink
538 * @pid: process id to send reply to
539 * @seq: sequence number
540 * @type: audit message type
541 * @done: done (last) flag
542 * @multi: multi-part message flag
543 * @payload: payload data
544 * @size: payload size
546 * Allocates an skb, builds the netlink message, and sends it to the pid.
547 * No failure notifications.
549 static void audit_send_reply(int pid, int seq, int type, int done, int multi,
550 const void *payload, int size)
553 struct task_struct *tsk;
554 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
560 skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
567 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
576 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
579 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
583 /* Only support the initial namespaces for now. */
584 if ((current_user_ns() != &init_user_ns) ||
585 (task_active_pid_ns(current) != &init_pid_ns))
595 case AUDIT_GET_FEATURE:
596 case AUDIT_SET_FEATURE:
597 case AUDIT_LIST_RULES:
600 case AUDIT_SIGNAL_INFO:
604 case AUDIT_MAKE_EQUIV:
605 if (!capable(CAP_AUDIT_CONTROL))
609 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
610 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
611 if (!capable(CAP_AUDIT_WRITE))
614 default: /* bad msg */
621 static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
624 uid_t uid = from_kuid(&init_user_ns, current_uid());
626 if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
631 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
634 audit_log_format(*ab, "pid=%d uid=%u", task_tgid_vnr(current), uid);
635 audit_log_session_info(*ab);
636 audit_log_task_context(*ab);
641 int is_audit_feature_set(int i)
643 return af.features & AUDIT_FEATURE_TO_MASK(i);
647 static int audit_get_feature(struct sk_buff *skb)
651 seq = nlmsg_hdr(skb)->nlmsg_seq;
653 audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
659 static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature,
660 u32 old_lock, u32 new_lock, int res)
662 struct audit_buffer *ab;
664 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
665 audit_log_format(ab, "feature=%s new=%d old=%d old_lock=%d new_lock=%d res=%d",
666 audit_feature_names[which], !!old_feature, !!new_feature,
667 !!old_lock, !!new_lock, res);
671 static int audit_set_feature(struct sk_buff *skb)
673 struct audit_features *uaf;
676 BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > sizeof(audit_feature_names)/sizeof(audit_feature_names[0]));
677 uaf = nlmsg_data(nlmsg_hdr(skb));
679 /* if there is ever a version 2 we should handle that here */
681 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
682 u32 feature = AUDIT_FEATURE_TO_MASK(i);
683 u32 old_feature, new_feature, old_lock, new_lock;
685 /* if we are not changing this feature, move along */
686 if (!(feature & uaf->mask))
689 old_feature = af.features & feature;
690 new_feature = uaf->features & feature;
691 new_lock = (uaf->lock | af.lock) & feature;
692 old_lock = af.lock & feature;
694 /* are we changing a locked feature? */
695 if ((af.lock & feature) && (new_feature != old_feature)) {
696 audit_log_feature_change(i, old_feature, new_feature,
697 old_lock, new_lock, 0);
701 /* nothing invalid, do the changes */
702 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
703 u32 feature = AUDIT_FEATURE_TO_MASK(i);
704 u32 old_feature, new_feature, old_lock, new_lock;
706 /* if we are not changing this feature, move along */
707 if (!(feature & uaf->mask))
710 old_feature = af.features & feature;
711 new_feature = uaf->features & feature;
712 old_lock = af.lock & feature;
713 new_lock = (uaf->lock | af.lock) & feature;
715 if (new_feature != old_feature)
716 audit_log_feature_change(i, old_feature, new_feature,
717 old_lock, new_lock, 1);
720 af.features |= feature;
722 af.features &= ~feature;
729 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
733 struct audit_status *status_get, status_set;
735 struct audit_buffer *ab;
736 u16 msg_type = nlh->nlmsg_type;
737 struct audit_sig_info *sig_data;
741 err = audit_netlink_ok(skb, msg_type);
745 /* As soon as there's any sign of userspace auditd,
746 * start kauditd to talk to it */
748 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
749 if (IS_ERR(kauditd_task)) {
750 err = PTR_ERR(kauditd_task);
755 seq = nlh->nlmsg_seq;
756 data = nlmsg_data(nlh);
760 status_set.enabled = audit_enabled;
761 status_set.failure = audit_failure;
762 status_set.pid = audit_pid;
763 status_set.rate_limit = audit_rate_limit;
764 status_set.backlog_limit = audit_backlog_limit;
765 status_set.lost = atomic_read(&audit_lost);
766 status_set.backlog = skb_queue_len(&audit_skb_queue);
767 audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
768 &status_set, sizeof(status_set));
771 if (nlh->nlmsg_len < sizeof(struct audit_status))
773 status_get = (struct audit_status *)data;
774 if (status_get->mask & AUDIT_STATUS_ENABLED) {
775 err = audit_set_enabled(status_get->enabled);
779 if (status_get->mask & AUDIT_STATUS_FAILURE) {
780 err = audit_set_failure(status_get->failure);
784 if (status_get->mask & AUDIT_STATUS_PID) {
785 int new_pid = status_get->pid;
787 if (audit_enabled != AUDIT_OFF)
788 audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
790 audit_nlk_portid = NETLINK_CB(skb).portid;
792 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
793 err = audit_set_rate_limit(status_get->rate_limit);
797 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
798 err = audit_set_backlog_limit(status_get->backlog_limit);
800 case AUDIT_GET_FEATURE:
801 err = audit_get_feature(skb);
805 case AUDIT_SET_FEATURE:
806 err = audit_set_feature(skb);
811 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
812 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
813 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
816 err = audit_filter_user(msg_type);
819 if (msg_type == AUDIT_USER_TTY) {
820 err = tty_audit_push_current();
824 audit_log_common_recv_msg(&ab, msg_type);
825 if (msg_type != AUDIT_USER_TTY)
826 audit_log_format(ab, " msg='%.*s'",
827 AUDIT_MESSAGE_TEXT_MAX,
832 audit_log_format(ab, " data=");
833 size = nlmsg_len(nlh);
835 ((unsigned char *)data)[size - 1] == '\0')
837 audit_log_n_untrustedstring(ab, data, size);
839 audit_set_pid(ab, NETLINK_CB(skb).portid);
845 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
847 if (audit_enabled == AUDIT_LOCKED) {
848 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
849 audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled);
854 case AUDIT_LIST_RULES:
855 err = audit_receive_filter(msg_type, NETLINK_CB(skb).portid,
856 seq, data, nlmsg_len(nlh));
860 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
861 audit_log_format(ab, " op=trim res=1");
864 case AUDIT_MAKE_EQUIV: {
867 size_t msglen = nlmsg_len(nlh);
871 if (msglen < 2 * sizeof(u32))
873 memcpy(sizes, bufp, 2 * sizeof(u32));
874 bufp += 2 * sizeof(u32);
875 msglen -= 2 * sizeof(u32);
876 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
881 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
887 /* OK, here comes... */
888 err = audit_tag_tree(old, new);
890 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
892 audit_log_format(ab, " op=make_equiv old=");
893 audit_log_untrustedstring(ab, old);
894 audit_log_format(ab, " new=");
895 audit_log_untrustedstring(ab, new);
896 audit_log_format(ab, " res=%d", !err);
902 case AUDIT_SIGNAL_INFO:
905 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
909 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
912 security_release_secctx(ctx, len);
915 sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
916 sig_data->pid = audit_sig_pid;
918 memcpy(sig_data->ctx, ctx, len);
919 security_release_secctx(ctx, len);
921 audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_SIGNAL_INFO,
922 0, 0, sig_data, sizeof(*sig_data) + len);
925 case AUDIT_TTY_GET: {
926 struct audit_tty_status s;
927 struct task_struct *tsk = current;
929 spin_lock(&tsk->sighand->siglock);
930 s.enabled = tsk->signal->audit_tty != 0;
931 s.log_passwd = tsk->signal->audit_tty_log_passwd;
932 spin_unlock(&tsk->sighand->siglock);
934 audit_send_reply(NETLINK_CB(skb).portid, seq,
935 AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
938 case AUDIT_TTY_SET: {
939 struct audit_tty_status s;
940 struct task_struct *tsk = current;
942 memset(&s, 0, sizeof(s));
943 /* guard against past and future API changes */
944 memcpy(&s, data, min(sizeof(s), (size_t)nlh->nlmsg_len));
945 if ((s.enabled != 0 && s.enabled != 1) ||
946 (s.log_passwd != 0 && s.log_passwd != 1))
949 spin_lock(&tsk->sighand->siglock);
950 tsk->signal->audit_tty = s.enabled;
951 tsk->signal->audit_tty_log_passwd = s.log_passwd;
952 spin_unlock(&tsk->sighand->siglock);
960 return err < 0 ? err : 0;
964 * Get message from skb. Each message is processed by audit_receive_msg.
965 * Malformed skbs with wrong length are discarded silently.
967 static void audit_receive_skb(struct sk_buff *skb)
969 struct nlmsghdr *nlh;
971 * len MUST be signed for nlmsg_next to be able to dec it below 0
972 * if the nlmsg_len was not aligned
977 nlh = nlmsg_hdr(skb);
980 while (nlmsg_ok(nlh, len)) {
981 err = audit_receive_msg(skb, nlh);
982 /* if err or if this message says it wants a response */
983 if (err || (nlh->nlmsg_flags & NLM_F_ACK))
984 netlink_ack(skb, nlh, err);
986 nlh = nlmsg_next(nlh, &len);
990 /* Receive messages from netlink socket. */
991 static void audit_receive(struct sk_buff *skb)
993 mutex_lock(&audit_cmd_mutex);
994 audit_receive_skb(skb);
995 mutex_unlock(&audit_cmd_mutex);
998 /* Initialize audit support at boot time. */
999 static int __init audit_init(void)
1002 struct netlink_kernel_cfg cfg = {
1003 .input = audit_receive,
1006 if (audit_initialized == AUDIT_DISABLED)
1009 printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
1010 audit_default ? "enabled" : "disabled");
1011 audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, &cfg);
1013 audit_panic("cannot initialize netlink socket");
1015 audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1017 skb_queue_head_init(&audit_skb_queue);
1018 skb_queue_head_init(&audit_skb_hold_queue);
1019 audit_initialized = AUDIT_INITIALIZED;
1020 audit_enabled = audit_default;
1021 audit_ever_enabled |= !!audit_default;
1023 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
1025 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
1026 INIT_LIST_HEAD(&audit_inode_hash[i]);
1030 __initcall(audit_init);
1032 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
1033 static int __init audit_enable(char *str)
1035 audit_default = !!simple_strtol(str, NULL, 0);
1037 audit_initialized = AUDIT_DISABLED;
1039 printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
1041 if (audit_initialized == AUDIT_INITIALIZED) {
1042 audit_enabled = audit_default;
1043 audit_ever_enabled |= !!audit_default;
1044 } else if (audit_initialized == AUDIT_UNINITIALIZED) {
1045 printk(" (after initialization)");
1047 printk(" (until reboot)");
1054 __setup("audit=", audit_enable);
1056 static void audit_buffer_free(struct audit_buffer *ab)
1058 unsigned long flags;
1066 spin_lock_irqsave(&audit_freelist_lock, flags);
1067 if (audit_freelist_count > AUDIT_MAXFREE)
1070 audit_freelist_count++;
1071 list_add(&ab->list, &audit_freelist);
1073 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1076 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1077 gfp_t gfp_mask, int type)
1079 unsigned long flags;
1080 struct audit_buffer *ab = NULL;
1081 struct nlmsghdr *nlh;
1083 spin_lock_irqsave(&audit_freelist_lock, flags);
1084 if (!list_empty(&audit_freelist)) {
1085 ab = list_entry(audit_freelist.next,
1086 struct audit_buffer, list);
1087 list_del(&ab->list);
1088 --audit_freelist_count;
1090 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1093 ab = kmalloc(sizeof(*ab), gfp_mask);
1099 ab->gfp_mask = gfp_mask;
1101 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1105 nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0);
1115 audit_buffer_free(ab);
1120 * audit_serial - compute a serial number for the audit record
1122 * Compute a serial number for the audit record. Audit records are
1123 * written to user-space as soon as they are generated, so a complete
1124 * audit record may be written in several pieces. The timestamp of the
1125 * record and this serial number are used by the user-space tools to
1126 * determine which pieces belong to the same audit record. The
1127 * (timestamp,serial) tuple is unique for each syscall and is live from
1128 * syscall entry to syscall exit.
1130 * NOTE: Another possibility is to store the formatted records off the
1131 * audit context (for those records that have a context), and emit them
1132 * all at syscall exit. However, this could delay the reporting of
1133 * significant errors until syscall exit (or never, if the system
1136 unsigned int audit_serial(void)
1138 static DEFINE_SPINLOCK(serial_lock);
1139 static unsigned int serial = 0;
1141 unsigned long flags;
1144 spin_lock_irqsave(&serial_lock, flags);
1147 } while (unlikely(!ret));
1148 spin_unlock_irqrestore(&serial_lock, flags);
1153 static inline void audit_get_stamp(struct audit_context *ctx,
1154 struct timespec *t, unsigned int *serial)
1156 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
1158 *serial = audit_serial();
1163 * Wait for auditd to drain the queue a little
1165 static void wait_for_auditd(unsigned long sleep_time)
1167 DECLARE_WAITQUEUE(wait, current);
1168 set_current_state(TASK_UNINTERRUPTIBLE);
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(sleep_time);
1175 __set_current_state(TASK_RUNNING);
1176 remove_wait_queue(&audit_backlog_wait, &wait);
1180 * audit_log_start - obtain an audit buffer
1181 * @ctx: audit_context (may be NULL)
1182 * @gfp_mask: type of allocation
1183 * @type: audit message type
1185 * Returns audit_buffer pointer on success or NULL on error.
1187 * Obtain an audit buffer. This routine does locking to obtain the
1188 * audit buffer, but then no locking is required for calls to
1189 * audit_log_*format. If the task (ctx) is a task that is currently in a
1190 * syscall, then the syscall is marked as auditable and an audit record
1191 * will be written at syscall exit. If there is no associated task, then
1192 * task context (ctx) should be NULL.
1194 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1197 struct audit_buffer *ab = NULL;
1199 unsigned int uninitialized_var(serial);
1201 unsigned long timeout_start = jiffies;
1203 if (audit_initialized != AUDIT_INITIALIZED)
1206 if (unlikely(audit_filter_type(type)))
1209 if (gfp_mask & __GFP_WAIT)
1212 reserve = 5; /* Allow atomic callers to go up to five
1213 entries over the normal backlog limit */
1215 while (audit_backlog_limit
1216 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1217 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) {
1218 unsigned long sleep_time;
1220 sleep_time = timeout_start + audit_backlog_wait_time -
1222 if ((long)sleep_time > 0)
1223 wait_for_auditd(sleep_time);
1226 if (audit_rate_check() && printk_ratelimit())
1228 "audit: audit_backlog=%d > "
1229 "audit_backlog_limit=%d\n",
1230 skb_queue_len(&audit_skb_queue),
1231 audit_backlog_limit);
1232 audit_log_lost("backlog limit exceeded");
1233 audit_backlog_wait_time = audit_backlog_wait_overflow;
1234 wake_up(&audit_backlog_wait);
1238 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1240 audit_log_lost("out of memory in audit_log_start");
1244 audit_get_stamp(ab->ctx, &t, &serial);
1246 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1247 t.tv_sec, t.tv_nsec/1000000, serial);
1252 * audit_expand - expand skb in the audit buffer
1254 * @extra: space to add at tail of the skb
1256 * Returns 0 (no space) on failed expansion, or available space if
1259 static inline int audit_expand(struct audit_buffer *ab, int extra)
1261 struct sk_buff *skb = ab->skb;
1262 int oldtail = skb_tailroom(skb);
1263 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1264 int newtail = skb_tailroom(skb);
1267 audit_log_lost("out of memory in audit_expand");
1271 skb->truesize += newtail - oldtail;
1276 * Format an audit message into the audit buffer. If there isn't enough
1277 * room in the audit buffer, more room will be allocated and vsnprint
1278 * will be called a second time. Currently, we assume that a printk
1279 * can't format message larger than 1024 bytes, so we don't either.
1281 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1285 struct sk_buff *skb;
1293 avail = skb_tailroom(skb);
1295 avail = audit_expand(ab, AUDIT_BUFSIZ);
1299 va_copy(args2, args);
1300 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1302 /* The printk buffer is 1024 bytes long, so if we get
1303 * here and AUDIT_BUFSIZ is at least 1024, then we can
1304 * log everything that printk could have logged. */
1305 avail = audit_expand(ab,
1306 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1309 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1320 * audit_log_format - format a message into the audit buffer.
1322 * @fmt: format string
1323 * @...: optional parameters matching @fmt string
1325 * All the work is done in audit_log_vformat.
1327 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1333 va_start(args, fmt);
1334 audit_log_vformat(ab, fmt, args);
1339 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1340 * @ab: the audit_buffer
1341 * @buf: buffer to convert to hex
1342 * @len: length of @buf to be converted
1344 * No return value; failure to expand is silently ignored.
1346 * This function will take the passed buf and convert it into a string of
1347 * ascii hex digits. The new string is placed onto the skb.
1349 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1352 int i, avail, new_len;
1354 struct sk_buff *skb;
1355 static const unsigned char *hex = "0123456789ABCDEF";
1362 avail = skb_tailroom(skb);
1364 if (new_len >= avail) {
1365 /* Round the buffer request up to the next multiple */
1366 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1367 avail = audit_expand(ab, new_len);
1372 ptr = skb_tail_pointer(skb);
1373 for (i=0; i<len; i++) {
1374 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
1375 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
1378 skb_put(skb, len << 1); /* new string is twice the old string */
1382 * Format a string of no more than slen characters into the audit buffer,
1383 * enclosed in quote marks.
1385 void audit_log_n_string(struct audit_buffer *ab, const char *string,
1390 struct sk_buff *skb;
1397 avail = skb_tailroom(skb);
1398 new_len = slen + 3; /* enclosing quotes + null terminator */
1399 if (new_len > avail) {
1400 avail = audit_expand(ab, new_len);
1404 ptr = skb_tail_pointer(skb);
1406 memcpy(ptr, string, slen);
1410 skb_put(skb, slen + 2); /* don't include null terminator */
1414 * audit_string_contains_control - does a string need to be logged in hex
1415 * @string: string to be checked
1416 * @len: max length of the string to check
1418 int audit_string_contains_control(const char *string, size_t len)
1420 const unsigned char *p;
1421 for (p = string; p < (const unsigned char *)string + len; p++) {
1422 if (*p == '"' || *p < 0x21 || *p > 0x7e)
1429 * audit_log_n_untrustedstring - log a string that may contain random characters
1431 * @len: length of string (not including trailing null)
1432 * @string: string to be logged
1434 * This code will escape a string that is passed to it if the string
1435 * contains a control character, unprintable character, double quote mark,
1436 * or a space. Unescaped strings will start and end with a double quote mark.
1437 * Strings that are escaped are printed in hex (2 digits per char).
1439 * The caller specifies the number of characters in the string to log, which may
1440 * or may not be the entire string.
1442 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1445 if (audit_string_contains_control(string, len))
1446 audit_log_n_hex(ab, string, len);
1448 audit_log_n_string(ab, string, len);
1452 * audit_log_untrustedstring - log a string that may contain random characters
1454 * @string: string to be logged
1456 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1457 * determine string length.
1459 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1461 audit_log_n_untrustedstring(ab, string, strlen(string));
1464 /* This is a helper-function to print the escaped d_path */
1465 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1466 const struct path *path)
1471 audit_log_format(ab, "%s", prefix);
1473 /* We will allow 11 spaces for ' (deleted)' to be appended */
1474 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1476 audit_log_string(ab, "<no_memory>");
1479 p = d_path(path, pathname, PATH_MAX+11);
1480 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
1481 /* FIXME: can we save some information here? */
1482 audit_log_string(ab, "<too_long>");
1484 audit_log_untrustedstring(ab, p);
1488 void audit_log_session_info(struct audit_buffer *ab)
1490 u32 sessionid = audit_get_sessionid(current);
1491 uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
1493 audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
1496 void audit_log_key(struct audit_buffer *ab, char *key)
1498 audit_log_format(ab, " key=");
1500 audit_log_untrustedstring(ab, key);
1502 audit_log_format(ab, "(null)");
1505 void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
1509 audit_log_format(ab, " %s=", prefix);
1510 CAP_FOR_EACH_U32(i) {
1511 audit_log_format(ab, "%08x",
1512 cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
1516 void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1518 kernel_cap_t *perm = &name->fcap.permitted;
1519 kernel_cap_t *inh = &name->fcap.inheritable;
1522 if (!cap_isclear(*perm)) {
1523 audit_log_cap(ab, "cap_fp", perm);
1526 if (!cap_isclear(*inh)) {
1527 audit_log_cap(ab, "cap_fi", inh);
1532 audit_log_format(ab, " cap_fe=%d cap_fver=%x",
1533 name->fcap.fE, name->fcap_ver);
1536 static inline int audit_copy_fcaps(struct audit_names *name,
1537 const struct dentry *dentry)
1539 struct cpu_vfs_cap_data caps;
1545 rc = get_vfs_caps_from_disk(dentry, &caps);
1549 name->fcap.permitted = caps.permitted;
1550 name->fcap.inheritable = caps.inheritable;
1551 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
1552 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
1553 VFS_CAP_REVISION_SHIFT;
1558 /* Copy inode data into an audit_names. */
1559 void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
1560 const struct inode *inode)
1562 name->ino = inode->i_ino;
1563 name->dev = inode->i_sb->s_dev;
1564 name->mode = inode->i_mode;
1565 name->uid = inode->i_uid;
1566 name->gid = inode->i_gid;
1567 name->rdev = inode->i_rdev;
1568 security_inode_getsecid(inode, &name->osid);
1569 audit_copy_fcaps(name, dentry);
1573 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1574 * @context: audit_context for the task
1575 * @n: audit_names structure with reportable details
1576 * @path: optional path to report instead of audit_names->name
1577 * @record_num: record number to report when handling a list of names
1578 * @call_panic: optional pointer to int that will be updated if secid fails
1580 void audit_log_name(struct audit_context *context, struct audit_names *n,
1581 struct path *path, int record_num, int *call_panic)
1583 struct audit_buffer *ab;
1584 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
1588 audit_log_format(ab, "item=%d", record_num);
1591 audit_log_d_path(ab, " name=", path);
1593 switch (n->name_len) {
1594 case AUDIT_NAME_FULL:
1595 /* log the full path */
1596 audit_log_format(ab, " name=");
1597 audit_log_untrustedstring(ab, n->name->name);
1600 /* name was specified as a relative path and the
1601 * directory component is the cwd */
1602 audit_log_d_path(ab, " name=", &context->pwd);
1605 /* log the name's directory component */
1606 audit_log_format(ab, " name=");
1607 audit_log_n_untrustedstring(ab, n->name->name,
1611 audit_log_format(ab, " name=(null)");
1613 if (n->ino != (unsigned long)-1) {
1614 audit_log_format(ab, " inode=%lu"
1615 " dev=%02x:%02x mode=%#ho"
1616 " ouid=%u ogid=%u rdev=%02x:%02x",
1621 from_kuid(&init_user_ns, n->uid),
1622 from_kgid(&init_user_ns, n->gid),
1629 if (security_secid_to_secctx(
1630 n->osid, &ctx, &len)) {
1631 audit_log_format(ab, " osid=%u", n->osid);
1635 audit_log_format(ab, " obj=%s", ctx);
1636 security_release_secctx(ctx, len);
1640 audit_log_fcaps(ab, n);
1644 int audit_log_task_context(struct audit_buffer *ab)
1651 security_task_getsecid(current, &sid);
1655 error = security_secid_to_secctx(sid, &ctx, &len);
1657 if (error != -EINVAL)
1662 audit_log_format(ab, " subj=%s", ctx);
1663 security_release_secctx(ctx, len);
1667 audit_panic("error in audit_log_task_context");
1670 EXPORT_SYMBOL(audit_log_task_context);
1672 void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
1674 const struct cred *cred;
1675 char name[sizeof(tsk->comm)];
1676 struct mm_struct *mm = tsk->mm;
1682 /* tsk == current */
1683 cred = current_cred();
1685 spin_lock_irq(&tsk->sighand->siglock);
1686 if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
1687 tty = tsk->signal->tty->name;
1690 spin_unlock_irq(&tsk->sighand->siglock);
1692 audit_log_format(ab,
1693 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1694 " euid=%u suid=%u fsuid=%u"
1695 " egid=%u sgid=%u fsgid=%u ses=%u tty=%s",
1698 from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
1699 from_kuid(&init_user_ns, cred->uid),
1700 from_kgid(&init_user_ns, cred->gid),
1701 from_kuid(&init_user_ns, cred->euid),
1702 from_kuid(&init_user_ns, cred->suid),
1703 from_kuid(&init_user_ns, cred->fsuid),
1704 from_kgid(&init_user_ns, cred->egid),
1705 from_kgid(&init_user_ns, cred->sgid),
1706 from_kgid(&init_user_ns, cred->fsgid),
1707 audit_get_sessionid(tsk), tty);
1709 get_task_comm(name, tsk);
1710 audit_log_format(ab, " comm=");
1711 audit_log_untrustedstring(ab, name);
1714 down_read(&mm->mmap_sem);
1716 audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
1717 up_read(&mm->mmap_sem);
1719 audit_log_task_context(ab);
1721 EXPORT_SYMBOL(audit_log_task_info);
1724 * audit_log_link_denied - report a link restriction denial
1725 * @operation: specific link opreation
1726 * @link: the path that triggered the restriction
1728 void audit_log_link_denied(const char *operation, struct path *link)
1730 struct audit_buffer *ab;
1731 struct audit_names *name;
1733 name = kzalloc(sizeof(*name), GFP_NOFS);
1737 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1738 ab = audit_log_start(current->audit_context, GFP_KERNEL,
1742 audit_log_format(ab, "op=%s", operation);
1743 audit_log_task_info(ab, current);
1744 audit_log_format(ab, " res=0");
1747 /* Generate AUDIT_PATH record with object. */
1748 name->type = AUDIT_TYPE_NORMAL;
1749 audit_copy_inode(name, link->dentry, link->dentry->d_inode);
1750 audit_log_name(current->audit_context, name, link, 0, NULL);
1756 * audit_log_end - end one audit record
1757 * @ab: the audit_buffer
1759 * The netlink_* functions cannot be called inside an irq context, so
1760 * the audit buffer is placed on a queue and a tasklet is scheduled to
1761 * remove them from the queue outside the irq context. May be called in
1764 void audit_log_end(struct audit_buffer *ab)
1768 if (!audit_rate_check()) {
1769 audit_log_lost("rate limit exceeded");
1771 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1772 nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN;
1775 skb_queue_tail(&audit_skb_queue, ab->skb);
1776 wake_up_interruptible(&kauditd_wait);
1778 audit_printk_skb(ab->skb);
1782 audit_buffer_free(ab);
1786 * audit_log - Log an audit record
1787 * @ctx: audit context
1788 * @gfp_mask: type of allocation
1789 * @type: audit message type
1790 * @fmt: format string to use
1791 * @...: variable parameters matching the format string
1793 * This is a convenience function that calls audit_log_start,
1794 * audit_log_vformat, and audit_log_end. It may be called
1797 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1798 const char *fmt, ...)
1800 struct audit_buffer *ab;
1803 ab = audit_log_start(ctx, gfp_mask, type);
1805 va_start(args, fmt);
1806 audit_log_vformat(ab, fmt, args);
1812 #ifdef CONFIG_SECURITY
1814 * audit_log_secctx - Converts and logs SELinux context
1816 * @secid: security number
1818 * This is a helper function that calls security_secid_to_secctx to convert
1819 * secid to secctx and then adds the (converted) SELinux context to the audit
1820 * log by calling audit_log_format, thus also preventing leak of internal secid
1821 * to userspace. If secid cannot be converted audit_panic is called.
1823 void audit_log_secctx(struct audit_buffer *ab, u32 secid)
1828 if (security_secid_to_secctx(secid, &secctx, &len)) {
1829 audit_panic("Cannot convert secid to context");
1831 audit_log_format(ab, " obj=%s", secctx);
1832 security_release_secctx(secctx, len);
1835 EXPORT_SYMBOL(audit_log_secctx);
1838 EXPORT_SYMBOL(audit_log_start);
1839 EXPORT_SYMBOL(audit_log_end);
1840 EXPORT_SYMBOL(audit_log_format);
1841 EXPORT_SYMBOL(audit_log);