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[2] = {
148 "only_unset_loginuid",
149 "loginuid_immutable",
153 /* Serialize requests from userspace. */
154 DEFINE_MUTEX(audit_cmd_mutex);
156 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
157 * audit records. Since printk uses a 1024 byte buffer, this buffer
158 * should be at least that large. */
159 #define AUDIT_BUFSIZ 1024
161 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
162 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
163 #define AUDIT_MAXFREE (2*NR_CPUS)
165 /* The audit_buffer is used when formatting an audit record. The caller
166 * locks briefly to get the record off the freelist or to allocate the
167 * buffer, and locks briefly to send the buffer to the netlink layer or
168 * to place it on a transmit queue. Multiple audit_buffers can be in
169 * use simultaneously. */
170 struct audit_buffer {
171 struct list_head list;
172 struct sk_buff *skb; /* formatted skb ready to send */
173 struct audit_context *ctx; /* NULL or associated context */
182 static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
185 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
186 nlh->nlmsg_pid = pid;
190 void audit_panic(const char *message)
192 switch (audit_failure)
194 case AUDIT_FAIL_SILENT:
196 case AUDIT_FAIL_PRINTK:
197 if (printk_ratelimit())
198 printk(KERN_ERR "audit: %s\n", message);
200 case AUDIT_FAIL_PANIC:
201 /* test audit_pid since printk is always losey, why bother? */
203 panic("audit: %s\n", message);
208 static inline int audit_rate_check(void)
210 static unsigned long last_check = 0;
211 static int messages = 0;
212 static DEFINE_SPINLOCK(lock);
215 unsigned long elapsed;
218 if (!audit_rate_limit) return 1;
220 spin_lock_irqsave(&lock, flags);
221 if (++messages < audit_rate_limit) {
225 elapsed = now - last_check;
232 spin_unlock_irqrestore(&lock, flags);
238 * audit_log_lost - conditionally log lost audit message event
239 * @message: the message stating reason for lost audit message
241 * Emit at least 1 message per second, even if audit_rate_check is
243 * Always increment the lost messages counter.
245 void audit_log_lost(const char *message)
247 static unsigned long last_msg = 0;
248 static DEFINE_SPINLOCK(lock);
253 atomic_inc(&audit_lost);
255 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
258 spin_lock_irqsave(&lock, flags);
260 if (now - last_msg > HZ) {
264 spin_unlock_irqrestore(&lock, flags);
268 if (printk_ratelimit())
270 "audit: audit_lost=%d audit_rate_limit=%d "
271 "audit_backlog_limit=%d\n",
272 atomic_read(&audit_lost),
274 audit_backlog_limit);
275 audit_panic(message);
279 static int audit_log_config_change(char *function_name, int new, int old,
282 struct audit_buffer *ab;
285 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
288 audit_log_format(ab, "%s=%d old=%d", function_name, new, old);
289 audit_log_session_info(ab);
290 rc = audit_log_task_context(ab);
292 allow_changes = 0; /* Something weird, deny request */
293 audit_log_format(ab, " res=%d", allow_changes);
298 static int audit_do_config_change(char *function_name, int *to_change, int new)
300 int allow_changes, rc = 0, old = *to_change;
302 /* check if we are locked */
303 if (audit_enabled == AUDIT_LOCKED)
308 if (audit_enabled != AUDIT_OFF) {
309 rc = audit_log_config_change(function_name, new, old, allow_changes);
314 /* If we are allowed, make the change */
315 if (allow_changes == 1)
317 /* Not allowed, update reason */
323 static int audit_set_rate_limit(int limit)
325 return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);
328 static int audit_set_backlog_limit(int limit)
330 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
333 static int audit_set_enabled(int state)
336 if (state < AUDIT_OFF || state > AUDIT_LOCKED)
339 rc = audit_do_config_change("audit_enabled", &audit_enabled, state);
341 audit_ever_enabled |= !!state;
346 static int audit_set_failure(int state)
348 if (state != AUDIT_FAIL_SILENT
349 && state != AUDIT_FAIL_PRINTK
350 && state != AUDIT_FAIL_PANIC)
353 return audit_do_config_change("audit_failure", &audit_failure, state);
357 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
358 * already have been sent via prink/syslog and so if these messages are dropped
359 * it is not a huge concern since we already passed the audit_log_lost()
360 * notification and stuff. This is just nice to get audit messages during
361 * boot before auditd is running or messages generated while auditd is stopped.
362 * This only holds messages is audit_default is set, aka booting with audit=1
363 * or building your kernel that way.
365 static void audit_hold_skb(struct sk_buff *skb)
368 skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)
369 skb_queue_tail(&audit_skb_hold_queue, skb);
375 * For one reason or another this nlh isn't getting delivered to the userspace
376 * audit daemon, just send it to printk.
378 static void audit_printk_skb(struct sk_buff *skb)
380 struct nlmsghdr *nlh = nlmsg_hdr(skb);
381 char *data = nlmsg_data(nlh);
383 if (nlh->nlmsg_type != AUDIT_EOE) {
384 if (printk_ratelimit())
385 printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data);
387 audit_log_lost("printk limit exceeded\n");
393 static void kauditd_send_skb(struct sk_buff *skb)
396 /* take a reference in case we can't send it and we want to hold it */
398 err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
400 BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
401 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
402 audit_log_lost("auditd disappeared\n");
404 /* we might get lucky and get this in the next auditd */
407 /* drop the extra reference if sent ok */
412 * flush_hold_queue - empty the hold queue if auditd appears
414 * If auditd just started, drain the queue of messages already
415 * sent to syslog/printk. Remember loss here is ok. We already
416 * called audit_log_lost() if it didn't go out normally. so the
417 * race between the skb_dequeue and the next check for audit_pid
420 * If you ever find kauditd to be too slow we can get a perf win
421 * by doing our own locking and keeping better track if there
422 * are messages in this queue. I don't see the need now, but
423 * in 5 years when I want to play with this again I'll see this
424 * note and still have no friggin idea what i'm thinking today.
426 static void flush_hold_queue(void)
430 if (!audit_default || !audit_pid)
433 skb = skb_dequeue(&audit_skb_hold_queue);
437 while (skb && audit_pid) {
438 kauditd_send_skb(skb);
439 skb = skb_dequeue(&audit_skb_hold_queue);
443 * if auditd just disappeared but we
444 * dequeued an skb we need to drop ref
450 static int kauditd_thread(void *dummy)
453 while (!kthread_should_stop()) {
455 DECLARE_WAITQUEUE(wait, current);
459 skb = skb_dequeue(&audit_skb_queue);
460 wake_up(&audit_backlog_wait);
463 kauditd_send_skb(skb);
465 audit_printk_skb(skb);
468 set_current_state(TASK_INTERRUPTIBLE);
469 add_wait_queue(&kauditd_wait, &wait);
471 if (!skb_queue_len(&audit_skb_queue)) {
476 __set_current_state(TASK_RUNNING);
477 remove_wait_queue(&kauditd_wait, &wait);
482 int audit_send_list(void *_dest)
484 struct audit_netlink_list *dest = _dest;
488 /* wait for parent to finish and send an ACK */
489 mutex_lock(&audit_cmd_mutex);
490 mutex_unlock(&audit_cmd_mutex);
492 while ((skb = __skb_dequeue(&dest->q)) != NULL)
493 netlink_unicast(audit_sock, skb, pid, 0);
500 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
501 int multi, const void *payload, int size)
504 struct nlmsghdr *nlh;
506 int flags = multi ? NLM_F_MULTI : 0;
507 int t = done ? NLMSG_DONE : type;
509 skb = nlmsg_new(size, GFP_KERNEL);
513 nlh = nlmsg_put(skb, pid, seq, t, size, flags);
516 data = nlmsg_data(nlh);
517 memcpy(data, payload, size);
525 static int audit_send_reply_thread(void *arg)
527 struct audit_reply *reply = (struct audit_reply *)arg;
529 mutex_lock(&audit_cmd_mutex);
530 mutex_unlock(&audit_cmd_mutex);
532 /* Ignore failure. It'll only happen if the sender goes away,
533 because our timeout is set to infinite. */
534 netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
539 * audit_send_reply - send an audit reply message via netlink
540 * @pid: process id to send reply to
541 * @seq: sequence number
542 * @type: audit message type
543 * @done: done (last) flag
544 * @multi: multi-part message flag
545 * @payload: payload data
546 * @size: payload size
548 * Allocates an skb, builds the netlink message, and sends it to the pid.
549 * No failure notifications.
551 static void audit_send_reply(int pid, int seq, int type, int done, int multi,
552 const void *payload, int size)
555 struct task_struct *tsk;
556 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
562 skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
569 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
578 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
581 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
585 /* Only support the initial namespaces for now. */
586 if ((current_user_ns() != &init_user_ns) ||
587 (task_active_pid_ns(current) != &init_pid_ns))
597 case AUDIT_GET_FEATURE:
598 case AUDIT_SET_FEATURE:
599 case AUDIT_LIST_RULES:
602 case AUDIT_SIGNAL_INFO:
606 case AUDIT_MAKE_EQUIV:
607 if (!capable(CAP_AUDIT_CONTROL))
611 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
612 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
613 if (!capable(CAP_AUDIT_WRITE))
616 default: /* bad msg */
623 static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
626 uid_t uid = from_kuid(&init_user_ns, current_uid());
628 if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
633 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
636 audit_log_format(*ab, "pid=%d uid=%u", task_tgid_vnr(current), uid);
637 audit_log_session_info(*ab);
638 audit_log_task_context(*ab);
643 int is_audit_feature_set(int i)
645 return af.features & AUDIT_FEATURE_TO_MASK(i);
649 static int audit_get_feature(struct sk_buff *skb)
653 seq = nlmsg_hdr(skb)->nlmsg_seq;
655 audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
661 static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature,
662 u32 old_lock, u32 new_lock, int res)
664 struct audit_buffer *ab;
666 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
667 audit_log_format(ab, "feature=%s new=%d old=%d old_lock=%d new_lock=%d res=%d",
668 audit_feature_names[which], !!old_feature, !!new_feature,
669 !!old_lock, !!new_lock, res);
673 static int audit_set_feature(struct sk_buff *skb)
675 struct audit_features *uaf;
678 BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > sizeof(audit_feature_names)/sizeof(audit_feature_names[0]));
679 uaf = nlmsg_data(nlmsg_hdr(skb));
681 /* if there is ever a version 2 we should handle that here */
683 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
684 u32 feature = AUDIT_FEATURE_TO_MASK(i);
685 u32 old_feature, new_feature, old_lock, new_lock;
687 /* if we are not changing this feature, move along */
688 if (!(feature & uaf->mask))
691 old_feature = af.features & feature;
692 new_feature = uaf->features & feature;
693 new_lock = (uaf->lock | af.lock) & feature;
694 old_lock = af.lock & feature;
696 /* are we changing a locked feature? */
697 if ((af.lock & feature) && (new_feature != old_feature)) {
698 audit_log_feature_change(i, old_feature, new_feature,
699 old_lock, new_lock, 0);
703 /* nothing invalid, do the changes */
704 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
705 u32 feature = AUDIT_FEATURE_TO_MASK(i);
706 u32 old_feature, new_feature, old_lock, new_lock;
708 /* if we are not changing this feature, move along */
709 if (!(feature & uaf->mask))
712 old_feature = af.features & feature;
713 new_feature = uaf->features & feature;
714 old_lock = af.lock & feature;
715 new_lock = (uaf->lock | af.lock) & feature;
717 if (new_feature != old_feature)
718 audit_log_feature_change(i, old_feature, new_feature,
719 old_lock, new_lock, 1);
722 af.features |= feature;
724 af.features &= ~feature;
731 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
735 struct audit_status *status_get, status_set;
737 struct audit_buffer *ab;
738 u16 msg_type = nlh->nlmsg_type;
739 struct audit_sig_info *sig_data;
743 err = audit_netlink_ok(skb, msg_type);
747 /* As soon as there's any sign of userspace auditd,
748 * start kauditd to talk to it */
750 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
751 if (IS_ERR(kauditd_task)) {
752 err = PTR_ERR(kauditd_task);
757 seq = nlh->nlmsg_seq;
758 data = nlmsg_data(nlh);
762 status_set.enabled = audit_enabled;
763 status_set.failure = audit_failure;
764 status_set.pid = audit_pid;
765 status_set.rate_limit = audit_rate_limit;
766 status_set.backlog_limit = audit_backlog_limit;
767 status_set.lost = atomic_read(&audit_lost);
768 status_set.backlog = skb_queue_len(&audit_skb_queue);
769 audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
770 &status_set, sizeof(status_set));
773 if (nlh->nlmsg_len < sizeof(struct audit_status))
775 status_get = (struct audit_status *)data;
776 if (status_get->mask & AUDIT_STATUS_ENABLED) {
777 err = audit_set_enabled(status_get->enabled);
781 if (status_get->mask & AUDIT_STATUS_FAILURE) {
782 err = audit_set_failure(status_get->failure);
786 if (status_get->mask & AUDIT_STATUS_PID) {
787 int new_pid = status_get->pid;
789 if (audit_enabled != AUDIT_OFF)
790 audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
792 audit_nlk_portid = NETLINK_CB(skb).portid;
794 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
795 err = audit_set_rate_limit(status_get->rate_limit);
799 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
800 err = audit_set_backlog_limit(status_get->backlog_limit);
802 case AUDIT_GET_FEATURE:
803 err = audit_get_feature(skb);
807 case AUDIT_SET_FEATURE:
808 err = audit_set_feature(skb);
813 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
814 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
815 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
818 err = audit_filter_user(msg_type);
821 if (msg_type == AUDIT_USER_TTY) {
822 err = tty_audit_push_current();
826 audit_log_common_recv_msg(&ab, msg_type);
827 if (msg_type != AUDIT_USER_TTY)
828 audit_log_format(ab, " msg='%.*s'",
829 AUDIT_MESSAGE_TEXT_MAX,
834 audit_log_format(ab, " data=");
835 size = nlmsg_len(nlh);
837 ((unsigned char *)data)[size - 1] == '\0')
839 audit_log_n_untrustedstring(ab, data, size);
841 audit_set_pid(ab, NETLINK_CB(skb).portid);
847 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
849 if (audit_enabled == AUDIT_LOCKED) {
850 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
851 audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled);
856 case AUDIT_LIST_RULES:
857 err = audit_receive_filter(msg_type, NETLINK_CB(skb).portid,
858 seq, data, nlmsg_len(nlh));
862 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
863 audit_log_format(ab, " op=trim res=1");
866 case AUDIT_MAKE_EQUIV: {
869 size_t msglen = nlmsg_len(nlh);
873 if (msglen < 2 * sizeof(u32))
875 memcpy(sizes, bufp, 2 * sizeof(u32));
876 bufp += 2 * sizeof(u32);
877 msglen -= 2 * sizeof(u32);
878 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
883 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
889 /* OK, here comes... */
890 err = audit_tag_tree(old, new);
892 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
894 audit_log_format(ab, " op=make_equiv old=");
895 audit_log_untrustedstring(ab, old);
896 audit_log_format(ab, " new=");
897 audit_log_untrustedstring(ab, new);
898 audit_log_format(ab, " res=%d", !err);
904 case AUDIT_SIGNAL_INFO:
907 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
911 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
914 security_release_secctx(ctx, len);
917 sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
918 sig_data->pid = audit_sig_pid;
920 memcpy(sig_data->ctx, ctx, len);
921 security_release_secctx(ctx, len);
923 audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_SIGNAL_INFO,
924 0, 0, sig_data, sizeof(*sig_data) + len);
927 case AUDIT_TTY_GET: {
928 struct audit_tty_status s;
929 struct task_struct *tsk = current;
931 spin_lock(&tsk->sighand->siglock);
932 s.enabled = tsk->signal->audit_tty != 0;
933 s.log_passwd = tsk->signal->audit_tty_log_passwd;
934 spin_unlock(&tsk->sighand->siglock);
936 audit_send_reply(NETLINK_CB(skb).portid, seq,
937 AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
940 case AUDIT_TTY_SET: {
941 struct audit_tty_status s;
942 struct task_struct *tsk = current;
944 memset(&s, 0, sizeof(s));
945 /* guard against past and future API changes */
946 memcpy(&s, data, min(sizeof(s), (size_t)nlh->nlmsg_len));
947 if ((s.enabled != 0 && s.enabled != 1) ||
948 (s.log_passwd != 0 && s.log_passwd != 1))
951 spin_lock(&tsk->sighand->siglock);
952 tsk->signal->audit_tty = s.enabled;
953 tsk->signal->audit_tty_log_passwd = s.log_passwd;
954 spin_unlock(&tsk->sighand->siglock);
962 return err < 0 ? err : 0;
966 * Get message from skb. Each message is processed by audit_receive_msg.
967 * Malformed skbs with wrong length are discarded silently.
969 static void audit_receive_skb(struct sk_buff *skb)
971 struct nlmsghdr *nlh;
973 * len MUST be signed for nlmsg_next to be able to dec it below 0
974 * if the nlmsg_len was not aligned
979 nlh = nlmsg_hdr(skb);
982 while (nlmsg_ok(nlh, len)) {
983 err = audit_receive_msg(skb, nlh);
984 /* if err or if this message says it wants a response */
985 if (err || (nlh->nlmsg_flags & NLM_F_ACK))
986 netlink_ack(skb, nlh, err);
988 nlh = nlmsg_next(nlh, &len);
992 /* Receive messages from netlink socket. */
993 static void audit_receive(struct sk_buff *skb)
995 mutex_lock(&audit_cmd_mutex);
996 audit_receive_skb(skb);
997 mutex_unlock(&audit_cmd_mutex);
1000 /* Initialize audit support at boot time. */
1001 static int __init audit_init(void)
1004 struct netlink_kernel_cfg cfg = {
1005 .input = audit_receive,
1008 if (audit_initialized == AUDIT_DISABLED)
1011 printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
1012 audit_default ? "enabled" : "disabled");
1013 audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, &cfg);
1015 audit_panic("cannot initialize netlink socket");
1017 audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1019 skb_queue_head_init(&audit_skb_queue);
1020 skb_queue_head_init(&audit_skb_hold_queue);
1021 audit_initialized = AUDIT_INITIALIZED;
1022 audit_enabled = audit_default;
1023 audit_ever_enabled |= !!audit_default;
1025 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
1027 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
1028 INIT_LIST_HEAD(&audit_inode_hash[i]);
1032 __initcall(audit_init);
1034 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
1035 static int __init audit_enable(char *str)
1037 audit_default = !!simple_strtol(str, NULL, 0);
1039 audit_initialized = AUDIT_DISABLED;
1041 printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
1043 if (audit_initialized == AUDIT_INITIALIZED) {
1044 audit_enabled = audit_default;
1045 audit_ever_enabled |= !!audit_default;
1046 } else if (audit_initialized == AUDIT_UNINITIALIZED) {
1047 printk(" (after initialization)");
1049 printk(" (until reboot)");
1056 __setup("audit=", audit_enable);
1058 static void audit_buffer_free(struct audit_buffer *ab)
1060 unsigned long flags;
1068 spin_lock_irqsave(&audit_freelist_lock, flags);
1069 if (audit_freelist_count > AUDIT_MAXFREE)
1072 audit_freelist_count++;
1073 list_add(&ab->list, &audit_freelist);
1075 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1078 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1079 gfp_t gfp_mask, int type)
1081 unsigned long flags;
1082 struct audit_buffer *ab = NULL;
1083 struct nlmsghdr *nlh;
1085 spin_lock_irqsave(&audit_freelist_lock, flags);
1086 if (!list_empty(&audit_freelist)) {
1087 ab = list_entry(audit_freelist.next,
1088 struct audit_buffer, list);
1089 list_del(&ab->list);
1090 --audit_freelist_count;
1092 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1095 ab = kmalloc(sizeof(*ab), gfp_mask);
1101 ab->gfp_mask = gfp_mask;
1103 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1107 nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0);
1117 audit_buffer_free(ab);
1122 * audit_serial - compute a serial number for the audit record
1124 * Compute a serial number for the audit record. Audit records are
1125 * written to user-space as soon as they are generated, so a complete
1126 * audit record may be written in several pieces. The timestamp of the
1127 * record and this serial number are used by the user-space tools to
1128 * determine which pieces belong to the same audit record. The
1129 * (timestamp,serial) tuple is unique for each syscall and is live from
1130 * syscall entry to syscall exit.
1132 * NOTE: Another possibility is to store the formatted records off the
1133 * audit context (for those records that have a context), and emit them
1134 * all at syscall exit. However, this could delay the reporting of
1135 * significant errors until syscall exit (or never, if the system
1138 unsigned int audit_serial(void)
1140 static DEFINE_SPINLOCK(serial_lock);
1141 static unsigned int serial = 0;
1143 unsigned long flags;
1146 spin_lock_irqsave(&serial_lock, flags);
1149 } while (unlikely(!ret));
1150 spin_unlock_irqrestore(&serial_lock, flags);
1155 static inline void audit_get_stamp(struct audit_context *ctx,
1156 struct timespec *t, unsigned int *serial)
1158 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
1160 *serial = audit_serial();
1165 * Wait for auditd to drain the queue a little
1167 static void wait_for_auditd(unsigned long sleep_time)
1169 DECLARE_WAITQUEUE(wait, current);
1170 set_current_state(TASK_UNINTERRUPTIBLE);
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(sleep_time);
1177 __set_current_state(TASK_RUNNING);
1178 remove_wait_queue(&audit_backlog_wait, &wait);
1182 * audit_log_start - obtain an audit buffer
1183 * @ctx: audit_context (may be NULL)
1184 * @gfp_mask: type of allocation
1185 * @type: audit message type
1187 * Returns audit_buffer pointer on success or NULL on error.
1189 * Obtain an audit buffer. This routine does locking to obtain the
1190 * audit buffer, but then no locking is required for calls to
1191 * audit_log_*format. If the task (ctx) is a task that is currently in a
1192 * syscall, then the syscall is marked as auditable and an audit record
1193 * will be written at syscall exit. If there is no associated task, then
1194 * task context (ctx) should be NULL.
1196 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1199 struct audit_buffer *ab = NULL;
1201 unsigned int uninitialized_var(serial);
1203 unsigned long timeout_start = jiffies;
1205 if (audit_initialized != AUDIT_INITIALIZED)
1208 if (unlikely(audit_filter_type(type)))
1211 if (gfp_mask & __GFP_WAIT)
1214 reserve = 5; /* Allow atomic callers to go up to five
1215 entries over the normal backlog limit */
1217 while (audit_backlog_limit
1218 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1219 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) {
1220 unsigned long sleep_time;
1222 sleep_time = timeout_start + audit_backlog_wait_time -
1224 if ((long)sleep_time > 0)
1225 wait_for_auditd(sleep_time);
1228 if (audit_rate_check() && printk_ratelimit())
1230 "audit: audit_backlog=%d > "
1231 "audit_backlog_limit=%d\n",
1232 skb_queue_len(&audit_skb_queue),
1233 audit_backlog_limit);
1234 audit_log_lost("backlog limit exceeded");
1235 audit_backlog_wait_time = audit_backlog_wait_overflow;
1236 wake_up(&audit_backlog_wait);
1240 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1242 audit_log_lost("out of memory in audit_log_start");
1246 audit_get_stamp(ab->ctx, &t, &serial);
1248 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1249 t.tv_sec, t.tv_nsec/1000000, serial);
1254 * audit_expand - expand skb in the audit buffer
1256 * @extra: space to add at tail of the skb
1258 * Returns 0 (no space) on failed expansion, or available space if
1261 static inline int audit_expand(struct audit_buffer *ab, int extra)
1263 struct sk_buff *skb = ab->skb;
1264 int oldtail = skb_tailroom(skb);
1265 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1266 int newtail = skb_tailroom(skb);
1269 audit_log_lost("out of memory in audit_expand");
1273 skb->truesize += newtail - oldtail;
1278 * Format an audit message into the audit buffer. If there isn't enough
1279 * room in the audit buffer, more room will be allocated and vsnprint
1280 * will be called a second time. Currently, we assume that a printk
1281 * can't format message larger than 1024 bytes, so we don't either.
1283 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1287 struct sk_buff *skb;
1295 avail = skb_tailroom(skb);
1297 avail = audit_expand(ab, AUDIT_BUFSIZ);
1301 va_copy(args2, args);
1302 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1304 /* The printk buffer is 1024 bytes long, so if we get
1305 * here and AUDIT_BUFSIZ is at least 1024, then we can
1306 * log everything that printk could have logged. */
1307 avail = audit_expand(ab,
1308 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1311 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1322 * audit_log_format - format a message into the audit buffer.
1324 * @fmt: format string
1325 * @...: optional parameters matching @fmt string
1327 * All the work is done in audit_log_vformat.
1329 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1335 va_start(args, fmt);
1336 audit_log_vformat(ab, fmt, args);
1341 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1342 * @ab: the audit_buffer
1343 * @buf: buffer to convert to hex
1344 * @len: length of @buf to be converted
1346 * No return value; failure to expand is silently ignored.
1348 * This function will take the passed buf and convert it into a string of
1349 * ascii hex digits. The new string is placed onto the skb.
1351 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1354 int i, avail, new_len;
1356 struct sk_buff *skb;
1357 static const unsigned char *hex = "0123456789ABCDEF";
1364 avail = skb_tailroom(skb);
1366 if (new_len >= avail) {
1367 /* Round the buffer request up to the next multiple */
1368 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1369 avail = audit_expand(ab, new_len);
1374 ptr = skb_tail_pointer(skb);
1375 for (i=0; i<len; i++) {
1376 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
1377 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
1380 skb_put(skb, len << 1); /* new string is twice the old string */
1384 * Format a string of no more than slen characters into the audit buffer,
1385 * enclosed in quote marks.
1387 void audit_log_n_string(struct audit_buffer *ab, const char *string,
1392 struct sk_buff *skb;
1399 avail = skb_tailroom(skb);
1400 new_len = slen + 3; /* enclosing quotes + null terminator */
1401 if (new_len > avail) {
1402 avail = audit_expand(ab, new_len);
1406 ptr = skb_tail_pointer(skb);
1408 memcpy(ptr, string, slen);
1412 skb_put(skb, slen + 2); /* don't include null terminator */
1416 * audit_string_contains_control - does a string need to be logged in hex
1417 * @string: string to be checked
1418 * @len: max length of the string to check
1420 int audit_string_contains_control(const char *string, size_t len)
1422 const unsigned char *p;
1423 for (p = string; p < (const unsigned char *)string + len; p++) {
1424 if (*p == '"' || *p < 0x21 || *p > 0x7e)
1431 * audit_log_n_untrustedstring - log a string that may contain random characters
1433 * @len: length of string (not including trailing null)
1434 * @string: string to be logged
1436 * This code will escape a string that is passed to it if the string
1437 * contains a control character, unprintable character, double quote mark,
1438 * or a space. Unescaped strings will start and end with a double quote mark.
1439 * Strings that are escaped are printed in hex (2 digits per char).
1441 * The caller specifies the number of characters in the string to log, which may
1442 * or may not be the entire string.
1444 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1447 if (audit_string_contains_control(string, len))
1448 audit_log_n_hex(ab, string, len);
1450 audit_log_n_string(ab, string, len);
1454 * audit_log_untrustedstring - log a string that may contain random characters
1456 * @string: string to be logged
1458 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1459 * determine string length.
1461 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1463 audit_log_n_untrustedstring(ab, string, strlen(string));
1466 /* This is a helper-function to print the escaped d_path */
1467 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1468 const struct path *path)
1473 audit_log_format(ab, "%s", prefix);
1475 /* We will allow 11 spaces for ' (deleted)' to be appended */
1476 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1478 audit_log_string(ab, "<no_memory>");
1481 p = d_path(path, pathname, PATH_MAX+11);
1482 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
1483 /* FIXME: can we save some information here? */
1484 audit_log_string(ab, "<too_long>");
1486 audit_log_untrustedstring(ab, p);
1490 void audit_log_session_info(struct audit_buffer *ab)
1492 u32 sessionid = audit_get_sessionid(current);
1493 uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
1495 audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
1498 void audit_log_key(struct audit_buffer *ab, char *key)
1500 audit_log_format(ab, " key=");
1502 audit_log_untrustedstring(ab, key);
1504 audit_log_format(ab, "(null)");
1507 void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
1511 audit_log_format(ab, " %s=", prefix);
1512 CAP_FOR_EACH_U32(i) {
1513 audit_log_format(ab, "%08x",
1514 cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
1518 void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1520 kernel_cap_t *perm = &name->fcap.permitted;
1521 kernel_cap_t *inh = &name->fcap.inheritable;
1524 if (!cap_isclear(*perm)) {
1525 audit_log_cap(ab, "cap_fp", perm);
1528 if (!cap_isclear(*inh)) {
1529 audit_log_cap(ab, "cap_fi", inh);
1534 audit_log_format(ab, " cap_fe=%d cap_fver=%x",
1535 name->fcap.fE, name->fcap_ver);
1538 static inline int audit_copy_fcaps(struct audit_names *name,
1539 const struct dentry *dentry)
1541 struct cpu_vfs_cap_data caps;
1547 rc = get_vfs_caps_from_disk(dentry, &caps);
1551 name->fcap.permitted = caps.permitted;
1552 name->fcap.inheritable = caps.inheritable;
1553 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
1554 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
1555 VFS_CAP_REVISION_SHIFT;
1560 /* Copy inode data into an audit_names. */
1561 void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
1562 const struct inode *inode)
1564 name->ino = inode->i_ino;
1565 name->dev = inode->i_sb->s_dev;
1566 name->mode = inode->i_mode;
1567 name->uid = inode->i_uid;
1568 name->gid = inode->i_gid;
1569 name->rdev = inode->i_rdev;
1570 security_inode_getsecid(inode, &name->osid);
1571 audit_copy_fcaps(name, dentry);
1575 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1576 * @context: audit_context for the task
1577 * @n: audit_names structure with reportable details
1578 * @path: optional path to report instead of audit_names->name
1579 * @record_num: record number to report when handling a list of names
1580 * @call_panic: optional pointer to int that will be updated if secid fails
1582 void audit_log_name(struct audit_context *context, struct audit_names *n,
1583 struct path *path, int record_num, int *call_panic)
1585 struct audit_buffer *ab;
1586 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
1590 audit_log_format(ab, "item=%d", record_num);
1593 audit_log_d_path(ab, " name=", path);
1595 switch (n->name_len) {
1596 case AUDIT_NAME_FULL:
1597 /* log the full path */
1598 audit_log_format(ab, " name=");
1599 audit_log_untrustedstring(ab, n->name->name);
1602 /* name was specified as a relative path and the
1603 * directory component is the cwd */
1604 audit_log_d_path(ab, " name=", &context->pwd);
1607 /* log the name's directory component */
1608 audit_log_format(ab, " name=");
1609 audit_log_n_untrustedstring(ab, n->name->name,
1613 audit_log_format(ab, " name=(null)");
1615 if (n->ino != (unsigned long)-1) {
1616 audit_log_format(ab, " inode=%lu"
1617 " dev=%02x:%02x mode=%#ho"
1618 " ouid=%u ogid=%u rdev=%02x:%02x",
1623 from_kuid(&init_user_ns, n->uid),
1624 from_kgid(&init_user_ns, n->gid),
1631 if (security_secid_to_secctx(
1632 n->osid, &ctx, &len)) {
1633 audit_log_format(ab, " osid=%u", n->osid);
1637 audit_log_format(ab, " obj=%s", ctx);
1638 security_release_secctx(ctx, len);
1642 audit_log_fcaps(ab, n);
1646 int audit_log_task_context(struct audit_buffer *ab)
1653 security_task_getsecid(current, &sid);
1657 error = security_secid_to_secctx(sid, &ctx, &len);
1659 if (error != -EINVAL)
1664 audit_log_format(ab, " subj=%s", ctx);
1665 security_release_secctx(ctx, len);
1669 audit_panic("error in audit_log_task_context");
1672 EXPORT_SYMBOL(audit_log_task_context);
1674 void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
1676 const struct cred *cred;
1677 char name[sizeof(tsk->comm)];
1678 struct mm_struct *mm = tsk->mm;
1684 /* tsk == current */
1685 cred = current_cred();
1687 spin_lock_irq(&tsk->sighand->siglock);
1688 if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
1689 tty = tsk->signal->tty->name;
1692 spin_unlock_irq(&tsk->sighand->siglock);
1694 audit_log_format(ab,
1695 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1696 " euid=%u suid=%u fsuid=%u"
1697 " egid=%u sgid=%u fsgid=%u ses=%u tty=%s",
1700 from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
1701 from_kuid(&init_user_ns, cred->uid),
1702 from_kgid(&init_user_ns, cred->gid),
1703 from_kuid(&init_user_ns, cred->euid),
1704 from_kuid(&init_user_ns, cred->suid),
1705 from_kuid(&init_user_ns, cred->fsuid),
1706 from_kgid(&init_user_ns, cred->egid),
1707 from_kgid(&init_user_ns, cred->sgid),
1708 from_kgid(&init_user_ns, cred->fsgid),
1709 audit_get_sessionid(tsk), tty);
1711 get_task_comm(name, tsk);
1712 audit_log_format(ab, " comm=");
1713 audit_log_untrustedstring(ab, name);
1716 down_read(&mm->mmap_sem);
1718 audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
1719 up_read(&mm->mmap_sem);
1721 audit_log_task_context(ab);
1723 EXPORT_SYMBOL(audit_log_task_info);
1726 * audit_log_link_denied - report a link restriction denial
1727 * @operation: specific link opreation
1728 * @link: the path that triggered the restriction
1730 void audit_log_link_denied(const char *operation, struct path *link)
1732 struct audit_buffer *ab;
1733 struct audit_names *name;
1735 name = kzalloc(sizeof(*name), GFP_NOFS);
1739 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1740 ab = audit_log_start(current->audit_context, GFP_KERNEL,
1744 audit_log_format(ab, "op=%s", operation);
1745 audit_log_task_info(ab, current);
1746 audit_log_format(ab, " res=0");
1749 /* Generate AUDIT_PATH record with object. */
1750 name->type = AUDIT_TYPE_NORMAL;
1751 audit_copy_inode(name, link->dentry, link->dentry->d_inode);
1752 audit_log_name(current->audit_context, name, link, 0, NULL);
1758 * audit_log_end - end one audit record
1759 * @ab: the audit_buffer
1761 * The netlink_* functions cannot be called inside an irq context, so
1762 * the audit buffer is placed on a queue and a tasklet is scheduled to
1763 * remove them from the queue outside the irq context. May be called in
1766 void audit_log_end(struct audit_buffer *ab)
1770 if (!audit_rate_check()) {
1771 audit_log_lost("rate limit exceeded");
1773 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1774 nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN;
1777 skb_queue_tail(&audit_skb_queue, ab->skb);
1778 wake_up_interruptible(&kauditd_wait);
1780 audit_printk_skb(ab->skb);
1784 audit_buffer_free(ab);
1788 * audit_log - Log an audit record
1789 * @ctx: audit context
1790 * @gfp_mask: type of allocation
1791 * @type: audit message type
1792 * @fmt: format string to use
1793 * @...: variable parameters matching the format string
1795 * This is a convenience function that calls audit_log_start,
1796 * audit_log_vformat, and audit_log_end. It may be called
1799 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1800 const char *fmt, ...)
1802 struct audit_buffer *ab;
1805 ab = audit_log_start(ctx, gfp_mask, type);
1807 va_start(args, fmt);
1808 audit_log_vformat(ab, fmt, args);
1814 #ifdef CONFIG_SECURITY
1816 * audit_log_secctx - Converts and logs SELinux context
1818 * @secid: security number
1820 * This is a helper function that calls security_secid_to_secctx to convert
1821 * secid to secctx and then adds the (converted) SELinux context to the audit
1822 * log by calling audit_log_format, thus also preventing leak of internal secid
1823 * to userspace. If secid cannot be converted audit_panic is called.
1825 void audit_log_secctx(struct audit_buffer *ab, u32 secid)
1830 if (security_secid_to_secctx(secid, &secctx, &len)) {
1831 audit_panic("Cannot convert secid to context");
1833 audit_log_format(ab, " obj=%s", secctx);
1834 security_release_secctx(secctx, len);
1837 EXPORT_SYMBOL(audit_log_secctx);
1840 EXPORT_SYMBOL(audit_log_start);
1841 EXPORT_SYMBOL(audit_log_end);
1842 EXPORT_SYMBOL(audit_log_format);
1843 EXPORT_SYMBOL(audit_log);