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 memset(&status_set, 0, sizeof(status_set));
763 status_set.enabled = audit_enabled;
764 status_set.failure = audit_failure;
765 status_set.pid = audit_pid;
766 status_set.rate_limit = audit_rate_limit;
767 status_set.backlog_limit = audit_backlog_limit;
768 status_set.lost = atomic_read(&audit_lost);
769 status_set.backlog = skb_queue_len(&audit_skb_queue);
770 audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
771 &status_set, sizeof(status_set));
774 if (nlmsg_len(nlh) < sizeof(struct audit_status))
776 status_get = (struct audit_status *)data;
777 if (status_get->mask & AUDIT_STATUS_ENABLED) {
778 err = audit_set_enabled(status_get->enabled);
782 if (status_get->mask & AUDIT_STATUS_FAILURE) {
783 err = audit_set_failure(status_get->failure);
787 if (status_get->mask & AUDIT_STATUS_PID) {
788 int new_pid = status_get->pid;
790 if (audit_enabled != AUDIT_OFF)
791 audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
793 audit_nlk_portid = NETLINK_CB(skb).portid;
795 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
796 err = audit_set_rate_limit(status_get->rate_limit);
800 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
801 err = audit_set_backlog_limit(status_get->backlog_limit);
803 case AUDIT_GET_FEATURE:
804 err = audit_get_feature(skb);
808 case AUDIT_SET_FEATURE:
809 err = audit_set_feature(skb);
814 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
815 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
816 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
819 err = audit_filter_user(msg_type);
822 if (msg_type == AUDIT_USER_TTY) {
823 err = tty_audit_push_current();
827 audit_log_common_recv_msg(&ab, msg_type);
828 if (msg_type != AUDIT_USER_TTY)
829 audit_log_format(ab, " msg='%.*s'",
830 AUDIT_MESSAGE_TEXT_MAX,
835 audit_log_format(ab, " data=");
836 size = nlmsg_len(nlh);
838 ((unsigned char *)data)[size - 1] == '\0')
840 audit_log_n_untrustedstring(ab, data, size);
842 audit_set_pid(ab, NETLINK_CB(skb).portid);
848 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
850 if (audit_enabled == AUDIT_LOCKED) {
851 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
852 audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled);
857 case AUDIT_LIST_RULES:
858 err = audit_receive_filter(msg_type, NETLINK_CB(skb).portid,
859 seq, data, nlmsg_len(nlh));
863 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
864 audit_log_format(ab, " op=trim res=1");
867 case AUDIT_MAKE_EQUIV: {
870 size_t msglen = nlmsg_len(nlh);
874 if (msglen < 2 * sizeof(u32))
876 memcpy(sizes, bufp, 2 * sizeof(u32));
877 bufp += 2 * sizeof(u32);
878 msglen -= 2 * sizeof(u32);
879 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
884 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
890 /* OK, here comes... */
891 err = audit_tag_tree(old, new);
893 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
895 audit_log_format(ab, " op=make_equiv old=");
896 audit_log_untrustedstring(ab, old);
897 audit_log_format(ab, " new=");
898 audit_log_untrustedstring(ab, new);
899 audit_log_format(ab, " res=%d", !err);
905 case AUDIT_SIGNAL_INFO:
908 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
912 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
915 security_release_secctx(ctx, len);
918 sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
919 sig_data->pid = audit_sig_pid;
921 memcpy(sig_data->ctx, ctx, len);
922 security_release_secctx(ctx, len);
924 audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_SIGNAL_INFO,
925 0, 0, sig_data, sizeof(*sig_data) + len);
928 case AUDIT_TTY_GET: {
929 struct audit_tty_status s;
930 struct task_struct *tsk = current;
932 spin_lock(&tsk->sighand->siglock);
933 s.enabled = tsk->signal->audit_tty;
934 s.log_passwd = tsk->signal->audit_tty_log_passwd;
935 spin_unlock(&tsk->sighand->siglock);
937 audit_send_reply(NETLINK_CB(skb).portid, seq,
938 AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
941 case AUDIT_TTY_SET: {
942 struct audit_tty_status s;
943 struct task_struct *tsk = current;
945 memset(&s, 0, sizeof(s));
946 /* guard against past and future API changes */
947 memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh)));
948 if ((s.enabled != 0 && s.enabled != 1) ||
949 (s.log_passwd != 0 && s.log_passwd != 1))
952 spin_lock(&tsk->sighand->siglock);
953 tsk->signal->audit_tty = s.enabled;
954 tsk->signal->audit_tty_log_passwd = s.log_passwd;
955 spin_unlock(&tsk->sighand->siglock);
963 return err < 0 ? err : 0;
967 * Get message from skb. Each message is processed by audit_receive_msg.
968 * Malformed skbs with wrong length are discarded silently.
970 static void audit_receive_skb(struct sk_buff *skb)
972 struct nlmsghdr *nlh;
974 * len MUST be signed for nlmsg_next to be able to dec it below 0
975 * if the nlmsg_len was not aligned
980 nlh = nlmsg_hdr(skb);
983 while (nlmsg_ok(nlh, len)) {
984 err = audit_receive_msg(skb, nlh);
985 /* if err or if this message says it wants a response */
986 if (err || (nlh->nlmsg_flags & NLM_F_ACK))
987 netlink_ack(skb, nlh, err);
989 nlh = nlmsg_next(nlh, &len);
993 /* Receive messages from netlink socket. */
994 static void audit_receive(struct sk_buff *skb)
996 mutex_lock(&audit_cmd_mutex);
997 audit_receive_skb(skb);
998 mutex_unlock(&audit_cmd_mutex);
1001 /* Initialize audit support at boot time. */
1002 static int __init audit_init(void)
1005 struct netlink_kernel_cfg cfg = {
1006 .input = audit_receive,
1009 if (audit_initialized == AUDIT_DISABLED)
1012 printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
1013 audit_default ? "enabled" : "disabled");
1014 audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, &cfg);
1016 audit_panic("cannot initialize netlink socket");
1018 audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1020 skb_queue_head_init(&audit_skb_queue);
1021 skb_queue_head_init(&audit_skb_hold_queue);
1022 audit_initialized = AUDIT_INITIALIZED;
1023 audit_enabled = audit_default;
1024 audit_ever_enabled |= !!audit_default;
1026 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
1028 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
1029 INIT_LIST_HEAD(&audit_inode_hash[i]);
1033 __initcall(audit_init);
1035 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
1036 static int __init audit_enable(char *str)
1038 audit_default = !!simple_strtol(str, NULL, 0);
1040 audit_initialized = AUDIT_DISABLED;
1042 printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
1044 if (audit_initialized == AUDIT_INITIALIZED) {
1045 audit_enabled = audit_default;
1046 audit_ever_enabled |= !!audit_default;
1047 } else if (audit_initialized == AUDIT_UNINITIALIZED) {
1048 printk(" (after initialization)");
1050 printk(" (until reboot)");
1057 __setup("audit=", audit_enable);
1059 static void audit_buffer_free(struct audit_buffer *ab)
1061 unsigned long flags;
1069 spin_lock_irqsave(&audit_freelist_lock, flags);
1070 if (audit_freelist_count > AUDIT_MAXFREE)
1073 audit_freelist_count++;
1074 list_add(&ab->list, &audit_freelist);
1076 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1079 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1080 gfp_t gfp_mask, int type)
1082 unsigned long flags;
1083 struct audit_buffer *ab = NULL;
1084 struct nlmsghdr *nlh;
1086 spin_lock_irqsave(&audit_freelist_lock, flags);
1087 if (!list_empty(&audit_freelist)) {
1088 ab = list_entry(audit_freelist.next,
1089 struct audit_buffer, list);
1090 list_del(&ab->list);
1091 --audit_freelist_count;
1093 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1096 ab = kmalloc(sizeof(*ab), gfp_mask);
1102 ab->gfp_mask = gfp_mask;
1104 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1108 nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0);
1118 audit_buffer_free(ab);
1123 * audit_serial - compute a serial number for the audit record
1125 * Compute a serial number for the audit record. Audit records are
1126 * written to user-space as soon as they are generated, so a complete
1127 * audit record may be written in several pieces. The timestamp of the
1128 * record and this serial number are used by the user-space tools to
1129 * determine which pieces belong to the same audit record. The
1130 * (timestamp,serial) tuple is unique for each syscall and is live from
1131 * syscall entry to syscall exit.
1133 * NOTE: Another possibility is to store the formatted records off the
1134 * audit context (for those records that have a context), and emit them
1135 * all at syscall exit. However, this could delay the reporting of
1136 * significant errors until syscall exit (or never, if the system
1139 unsigned int audit_serial(void)
1141 static DEFINE_SPINLOCK(serial_lock);
1142 static unsigned int serial = 0;
1144 unsigned long flags;
1147 spin_lock_irqsave(&serial_lock, flags);
1150 } while (unlikely(!ret));
1151 spin_unlock_irqrestore(&serial_lock, flags);
1156 static inline void audit_get_stamp(struct audit_context *ctx,
1157 struct timespec *t, unsigned int *serial)
1159 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
1161 *serial = audit_serial();
1166 * Wait for auditd to drain the queue a little
1168 static void wait_for_auditd(unsigned long sleep_time)
1170 DECLARE_WAITQUEUE(wait, current);
1171 set_current_state(TASK_UNINTERRUPTIBLE);
1172 add_wait_queue(&audit_backlog_wait, &wait);
1174 if (audit_backlog_limit &&
1175 skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
1176 schedule_timeout(sleep_time);
1178 __set_current_state(TASK_RUNNING);
1179 remove_wait_queue(&audit_backlog_wait, &wait);
1183 * audit_log_start - obtain an audit buffer
1184 * @ctx: audit_context (may be NULL)
1185 * @gfp_mask: type of allocation
1186 * @type: audit message type
1188 * Returns audit_buffer pointer on success or NULL on error.
1190 * Obtain an audit buffer. This routine does locking to obtain the
1191 * audit buffer, but then no locking is required for calls to
1192 * audit_log_*format. If the task (ctx) is a task that is currently in a
1193 * syscall, then the syscall is marked as auditable and an audit record
1194 * will be written at syscall exit. If there is no associated task, then
1195 * task context (ctx) should be NULL.
1197 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1200 struct audit_buffer *ab = NULL;
1202 unsigned int uninitialized_var(serial);
1204 unsigned long timeout_start = jiffies;
1206 if (audit_initialized != AUDIT_INITIALIZED)
1209 if (unlikely(audit_filter_type(type)))
1212 if (gfp_mask & __GFP_WAIT)
1215 reserve = 5; /* Allow atomic callers to go up to five
1216 entries over the normal backlog limit */
1218 while (audit_backlog_limit
1219 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1220 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) {
1221 unsigned long sleep_time;
1223 sleep_time = timeout_start + audit_backlog_wait_time -
1225 if ((long)sleep_time > 0)
1226 wait_for_auditd(sleep_time);
1229 if (audit_rate_check() && printk_ratelimit())
1231 "audit: audit_backlog=%d > "
1232 "audit_backlog_limit=%d\n",
1233 skb_queue_len(&audit_skb_queue),
1234 audit_backlog_limit);
1235 audit_log_lost("backlog limit exceeded");
1236 audit_backlog_wait_time = audit_backlog_wait_overflow;
1237 wake_up(&audit_backlog_wait);
1241 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1243 audit_log_lost("out of memory in audit_log_start");
1247 audit_get_stamp(ab->ctx, &t, &serial);
1249 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1250 t.tv_sec, t.tv_nsec/1000000, serial);
1255 * audit_expand - expand skb in the audit buffer
1257 * @extra: space to add at tail of the skb
1259 * Returns 0 (no space) on failed expansion, or available space if
1262 static inline int audit_expand(struct audit_buffer *ab, int extra)
1264 struct sk_buff *skb = ab->skb;
1265 int oldtail = skb_tailroom(skb);
1266 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1267 int newtail = skb_tailroom(skb);
1270 audit_log_lost("out of memory in audit_expand");
1274 skb->truesize += newtail - oldtail;
1279 * Format an audit message into the audit buffer. If there isn't enough
1280 * room in the audit buffer, more room will be allocated and vsnprint
1281 * will be called a second time. Currently, we assume that a printk
1282 * can't format message larger than 1024 bytes, so we don't either.
1284 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1288 struct sk_buff *skb;
1296 avail = skb_tailroom(skb);
1298 avail = audit_expand(ab, AUDIT_BUFSIZ);
1302 va_copy(args2, args);
1303 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1305 /* The printk buffer is 1024 bytes long, so if we get
1306 * here and AUDIT_BUFSIZ is at least 1024, then we can
1307 * log everything that printk could have logged. */
1308 avail = audit_expand(ab,
1309 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1312 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1323 * audit_log_format - format a message into the audit buffer.
1325 * @fmt: format string
1326 * @...: optional parameters matching @fmt string
1328 * All the work is done in audit_log_vformat.
1330 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1336 va_start(args, fmt);
1337 audit_log_vformat(ab, fmt, args);
1342 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1343 * @ab: the audit_buffer
1344 * @buf: buffer to convert to hex
1345 * @len: length of @buf to be converted
1347 * No return value; failure to expand is silently ignored.
1349 * This function will take the passed buf and convert it into a string of
1350 * ascii hex digits. The new string is placed onto the skb.
1352 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1355 int i, avail, new_len;
1357 struct sk_buff *skb;
1358 static const unsigned char *hex = "0123456789ABCDEF";
1365 avail = skb_tailroom(skb);
1367 if (new_len >= avail) {
1368 /* Round the buffer request up to the next multiple */
1369 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1370 avail = audit_expand(ab, new_len);
1375 ptr = skb_tail_pointer(skb);
1376 for (i=0; i<len; i++) {
1377 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
1378 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
1381 skb_put(skb, len << 1); /* new string is twice the old string */
1385 * Format a string of no more than slen characters into the audit buffer,
1386 * enclosed in quote marks.
1388 void audit_log_n_string(struct audit_buffer *ab, const char *string,
1393 struct sk_buff *skb;
1400 avail = skb_tailroom(skb);
1401 new_len = slen + 3; /* enclosing quotes + null terminator */
1402 if (new_len > avail) {
1403 avail = audit_expand(ab, new_len);
1407 ptr = skb_tail_pointer(skb);
1409 memcpy(ptr, string, slen);
1413 skb_put(skb, slen + 2); /* don't include null terminator */
1417 * audit_string_contains_control - does a string need to be logged in hex
1418 * @string: string to be checked
1419 * @len: max length of the string to check
1421 int audit_string_contains_control(const char *string, size_t len)
1423 const unsigned char *p;
1424 for (p = string; p < (const unsigned char *)string + len; p++) {
1425 if (*p == '"' || *p < 0x21 || *p > 0x7e)
1432 * audit_log_n_untrustedstring - log a string that may contain random characters
1434 * @len: length of string (not including trailing null)
1435 * @string: string to be logged
1437 * This code will escape a string that is passed to it if the string
1438 * contains a control character, unprintable character, double quote mark,
1439 * or a space. Unescaped strings will start and end with a double quote mark.
1440 * Strings that are escaped are printed in hex (2 digits per char).
1442 * The caller specifies the number of characters in the string to log, which may
1443 * or may not be the entire string.
1445 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1448 if (audit_string_contains_control(string, len))
1449 audit_log_n_hex(ab, string, len);
1451 audit_log_n_string(ab, string, len);
1455 * audit_log_untrustedstring - log a string that may contain random characters
1457 * @string: string to be logged
1459 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1460 * determine string length.
1462 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1464 audit_log_n_untrustedstring(ab, string, strlen(string));
1467 /* This is a helper-function to print the escaped d_path */
1468 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1469 const struct path *path)
1474 audit_log_format(ab, "%s", prefix);
1476 /* We will allow 11 spaces for ' (deleted)' to be appended */
1477 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1479 audit_log_string(ab, "<no_memory>");
1482 p = d_path(path, pathname, PATH_MAX+11);
1483 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
1484 /* FIXME: can we save some information here? */
1485 audit_log_string(ab, "<too_long>");
1487 audit_log_untrustedstring(ab, p);
1491 void audit_log_session_info(struct audit_buffer *ab)
1493 u32 sessionid = audit_get_sessionid(current);
1494 uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
1496 audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
1499 void audit_log_key(struct audit_buffer *ab, char *key)
1501 audit_log_format(ab, " key=");
1503 audit_log_untrustedstring(ab, key);
1505 audit_log_format(ab, "(null)");
1508 void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
1512 audit_log_format(ab, " %s=", prefix);
1513 CAP_FOR_EACH_U32(i) {
1514 audit_log_format(ab, "%08x",
1515 cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
1519 void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1521 kernel_cap_t *perm = &name->fcap.permitted;
1522 kernel_cap_t *inh = &name->fcap.inheritable;
1525 if (!cap_isclear(*perm)) {
1526 audit_log_cap(ab, "cap_fp", perm);
1529 if (!cap_isclear(*inh)) {
1530 audit_log_cap(ab, "cap_fi", inh);
1535 audit_log_format(ab, " cap_fe=%d cap_fver=%x",
1536 name->fcap.fE, name->fcap_ver);
1539 static inline int audit_copy_fcaps(struct audit_names *name,
1540 const struct dentry *dentry)
1542 struct cpu_vfs_cap_data caps;
1548 rc = get_vfs_caps_from_disk(dentry, &caps);
1552 name->fcap.permitted = caps.permitted;
1553 name->fcap.inheritable = caps.inheritable;
1554 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
1555 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
1556 VFS_CAP_REVISION_SHIFT;
1561 /* Copy inode data into an audit_names. */
1562 void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
1563 const struct inode *inode)
1565 name->ino = inode->i_ino;
1566 name->dev = inode->i_sb->s_dev;
1567 name->mode = inode->i_mode;
1568 name->uid = inode->i_uid;
1569 name->gid = inode->i_gid;
1570 name->rdev = inode->i_rdev;
1571 security_inode_getsecid(inode, &name->osid);
1572 audit_copy_fcaps(name, dentry);
1576 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1577 * @context: audit_context for the task
1578 * @n: audit_names structure with reportable details
1579 * @path: optional path to report instead of audit_names->name
1580 * @record_num: record number to report when handling a list of names
1581 * @call_panic: optional pointer to int that will be updated if secid fails
1583 void audit_log_name(struct audit_context *context, struct audit_names *n,
1584 struct path *path, int record_num, int *call_panic)
1586 struct audit_buffer *ab;
1587 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
1591 audit_log_format(ab, "item=%d", record_num);
1594 audit_log_d_path(ab, " name=", path);
1596 switch (n->name_len) {
1597 case AUDIT_NAME_FULL:
1598 /* log the full path */
1599 audit_log_format(ab, " name=");
1600 audit_log_untrustedstring(ab, n->name->name);
1603 /* name was specified as a relative path and the
1604 * directory component is the cwd */
1605 audit_log_d_path(ab, " name=", &context->pwd);
1608 /* log the name's directory component */
1609 audit_log_format(ab, " name=");
1610 audit_log_n_untrustedstring(ab, n->name->name,
1614 audit_log_format(ab, " name=(null)");
1616 if (n->ino != (unsigned long)-1) {
1617 audit_log_format(ab, " inode=%lu"
1618 " dev=%02x:%02x mode=%#ho"
1619 " ouid=%u ogid=%u rdev=%02x:%02x",
1624 from_kuid(&init_user_ns, n->uid),
1625 from_kgid(&init_user_ns, n->gid),
1632 if (security_secid_to_secctx(
1633 n->osid, &ctx, &len)) {
1634 audit_log_format(ab, " osid=%u", n->osid);
1638 audit_log_format(ab, " obj=%s", ctx);
1639 security_release_secctx(ctx, len);
1643 /* log the audit_names record type */
1644 audit_log_format(ab, " nametype=");
1646 case AUDIT_TYPE_NORMAL:
1647 audit_log_format(ab, "NORMAL");
1649 case AUDIT_TYPE_PARENT:
1650 audit_log_format(ab, "PARENT");
1652 case AUDIT_TYPE_CHILD_DELETE:
1653 audit_log_format(ab, "DELETE");
1655 case AUDIT_TYPE_CHILD_CREATE:
1656 audit_log_format(ab, "CREATE");
1659 audit_log_format(ab, "UNKNOWN");
1663 audit_log_fcaps(ab, n);
1667 int audit_log_task_context(struct audit_buffer *ab)
1674 security_task_getsecid(current, &sid);
1678 error = security_secid_to_secctx(sid, &ctx, &len);
1680 if (error != -EINVAL)
1685 audit_log_format(ab, " subj=%s", ctx);
1686 security_release_secctx(ctx, len);
1690 audit_panic("error in audit_log_task_context");
1693 EXPORT_SYMBOL(audit_log_task_context);
1695 void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
1697 const struct cred *cred;
1698 char name[sizeof(tsk->comm)];
1699 struct mm_struct *mm = tsk->mm;
1705 /* tsk == current */
1706 cred = current_cred();
1708 spin_lock_irq(&tsk->sighand->siglock);
1709 if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
1710 tty = tsk->signal->tty->name;
1713 spin_unlock_irq(&tsk->sighand->siglock);
1715 audit_log_format(ab,
1716 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1717 " euid=%u suid=%u fsuid=%u"
1718 " egid=%u sgid=%u fsgid=%u ses=%u tty=%s",
1721 from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
1722 from_kuid(&init_user_ns, cred->uid),
1723 from_kgid(&init_user_ns, cred->gid),
1724 from_kuid(&init_user_ns, cred->euid),
1725 from_kuid(&init_user_ns, cred->suid),
1726 from_kuid(&init_user_ns, cred->fsuid),
1727 from_kgid(&init_user_ns, cred->egid),
1728 from_kgid(&init_user_ns, cred->sgid),
1729 from_kgid(&init_user_ns, cred->fsgid),
1730 audit_get_sessionid(tsk), tty);
1732 get_task_comm(name, tsk);
1733 audit_log_format(ab, " comm=");
1734 audit_log_untrustedstring(ab, name);
1737 down_read(&mm->mmap_sem);
1739 audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
1740 up_read(&mm->mmap_sem);
1742 audit_log_task_context(ab);
1744 EXPORT_SYMBOL(audit_log_task_info);
1747 * audit_log_link_denied - report a link restriction denial
1748 * @operation: specific link opreation
1749 * @link: the path that triggered the restriction
1751 void audit_log_link_denied(const char *operation, struct path *link)
1753 struct audit_buffer *ab;
1754 struct audit_names *name;
1756 name = kzalloc(sizeof(*name), GFP_NOFS);
1760 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1761 ab = audit_log_start(current->audit_context, GFP_KERNEL,
1765 audit_log_format(ab, "op=%s", operation);
1766 audit_log_task_info(ab, current);
1767 audit_log_format(ab, " res=0");
1770 /* Generate AUDIT_PATH record with object. */
1771 name->type = AUDIT_TYPE_NORMAL;
1772 audit_copy_inode(name, link->dentry, link->dentry->d_inode);
1773 audit_log_name(current->audit_context, name, link, 0, NULL);
1779 * audit_log_end - end one audit record
1780 * @ab: the audit_buffer
1782 * The netlink_* functions cannot be called inside an irq context, so
1783 * the audit buffer is placed on a queue and a tasklet is scheduled to
1784 * remove them from the queue outside the irq context. May be called in
1787 void audit_log_end(struct audit_buffer *ab)
1791 if (!audit_rate_check()) {
1792 audit_log_lost("rate limit exceeded");
1794 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1795 nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN;
1798 skb_queue_tail(&audit_skb_queue, ab->skb);
1799 wake_up_interruptible(&kauditd_wait);
1801 audit_printk_skb(ab->skb);
1805 audit_buffer_free(ab);
1809 * audit_log - Log an audit record
1810 * @ctx: audit context
1811 * @gfp_mask: type of allocation
1812 * @type: audit message type
1813 * @fmt: format string to use
1814 * @...: variable parameters matching the format string
1816 * This is a convenience function that calls audit_log_start,
1817 * audit_log_vformat, and audit_log_end. It may be called
1820 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1821 const char *fmt, ...)
1823 struct audit_buffer *ab;
1826 ab = audit_log_start(ctx, gfp_mask, type);
1828 va_start(args, fmt);
1829 audit_log_vformat(ab, fmt, args);
1835 #ifdef CONFIG_SECURITY
1837 * audit_log_secctx - Converts and logs SELinux context
1839 * @secid: security number
1841 * This is a helper function that calls security_secid_to_secctx to convert
1842 * secid to secctx and then adds the (converted) SELinux context to the audit
1843 * log by calling audit_log_format, thus also preventing leak of internal secid
1844 * to userspace. If secid cannot be converted audit_panic is called.
1846 void audit_log_secctx(struct audit_buffer *ab, u32 secid)
1851 if (security_secid_to_secctx(secid, &secctx, &len)) {
1852 audit_panic("Cannot convert secid to context");
1854 audit_log_format(ab, " obj=%s", secctx);
1855 security_release_secctx(secctx, len);
1858 EXPORT_SYMBOL(audit_log_secctx);
1861 EXPORT_SYMBOL(audit_log_start);
1862 EXPORT_SYMBOL(audit_log_end);
1863 EXPORT_SYMBOL(audit_log_format);
1864 EXPORT_SYMBOL(audit_log);