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 <net/netlink.h>
64 #include <linux/freezer.h>
65 #include <linux/tty.h>
66 #include <linux/pid_namespace.h>
70 /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
71 * (Initialization happens after skb_init is called.) */
72 #define AUDIT_DISABLED -1
73 #define AUDIT_UNINITIALIZED 0
74 #define AUDIT_INITIALIZED 1
75 static int audit_initialized
;
79 #define AUDIT_LOCKED 2
81 int audit_ever_enabled
;
83 EXPORT_SYMBOL_GPL(audit_enabled
);
85 /* Default state when kernel boots without any parameters. */
86 static int audit_default
;
88 /* If auditing cannot proceed, audit_failure selects what happens. */
89 static int audit_failure
= AUDIT_FAIL_PRINTK
;
92 * If audit records are to be written to the netlink socket, audit_pid
93 * contains the pid of the auditd process and audit_nlk_portid contains
94 * the portid to use to send netlink messages to that process.
97 static int audit_nlk_portid
;
99 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
100 * to that number per second. This prevents DoS attacks, but results in
101 * audit records being dropped. */
102 static int audit_rate_limit
;
104 /* Number of outstanding audit_buffers allowed. */
105 static int audit_backlog_limit
= 64;
106 static int audit_backlog_wait_time
= 60 * HZ
;
107 static int audit_backlog_wait_overflow
= 0;
109 /* The identity of the user shutting down the audit system. */
110 kuid_t audit_sig_uid
= INVALID_UID
;
111 pid_t audit_sig_pid
= -1;
112 u32 audit_sig_sid
= 0;
114 /* Records can be lost in several ways:
115 0) [suppressed in audit_alloc]
116 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
117 2) out of memory in audit_log_move [alloc_skb]
118 3) suppressed due to audit_rate_limit
119 4) suppressed due to audit_backlog_limit
121 static atomic_t audit_lost
= ATOMIC_INIT(0);
123 /* The netlink socket. */
124 static struct sock
*audit_sock
;
126 /* Hash for inode-based rules */
127 struct list_head audit_inode_hash
[AUDIT_INODE_BUCKETS
];
129 /* The audit_freelist is a list of pre-allocated audit buffers (if more
130 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
131 * being placed on the freelist). */
132 static DEFINE_SPINLOCK(audit_freelist_lock
);
133 static int audit_freelist_count
;
134 static LIST_HEAD(audit_freelist
);
136 static struct sk_buff_head audit_skb_queue
;
137 /* queue of skbs to send to auditd when/if it comes back */
138 static struct sk_buff_head audit_skb_hold_queue
;
139 static struct task_struct
*kauditd_task
;
140 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait
);
141 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait
);
143 /* Serialize requests from userspace. */
144 DEFINE_MUTEX(audit_cmd_mutex
);
146 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
147 * audit records. Since printk uses a 1024 byte buffer, this buffer
148 * should be at least that large. */
149 #define AUDIT_BUFSIZ 1024
151 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
152 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
153 #define AUDIT_MAXFREE (2*NR_CPUS)
155 /* The audit_buffer is used when formatting an audit record. The caller
156 * locks briefly to get the record off the freelist or to allocate the
157 * buffer, and locks briefly to send the buffer to the netlink layer or
158 * to place it on a transmit queue. Multiple audit_buffers can be in
159 * use simultaneously. */
160 struct audit_buffer
{
161 struct list_head list
;
162 struct sk_buff
*skb
; /* formatted skb ready to send */
163 struct audit_context
*ctx
; /* NULL or associated context */
172 static void audit_set_pid(struct audit_buffer
*ab
, pid_t pid
)
175 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
176 nlh
->nlmsg_pid
= pid
;
180 void audit_panic(const char *message
)
182 switch (audit_failure
)
184 case AUDIT_FAIL_SILENT
:
186 case AUDIT_FAIL_PRINTK
:
187 if (printk_ratelimit())
188 printk(KERN_ERR
"audit: %s\n", message
);
190 case AUDIT_FAIL_PANIC
:
191 /* test audit_pid since printk is always losey, why bother? */
193 panic("audit: %s\n", message
);
198 static inline int audit_rate_check(void)
200 static unsigned long last_check
= 0;
201 static int messages
= 0;
202 static DEFINE_SPINLOCK(lock
);
205 unsigned long elapsed
;
208 if (!audit_rate_limit
) return 1;
210 spin_lock_irqsave(&lock
, flags
);
211 if (++messages
< audit_rate_limit
) {
215 elapsed
= now
- last_check
;
222 spin_unlock_irqrestore(&lock
, flags
);
228 * audit_log_lost - conditionally log lost audit message event
229 * @message: the message stating reason for lost audit message
231 * Emit at least 1 message per second, even if audit_rate_check is
233 * Always increment the lost messages counter.
235 void audit_log_lost(const char *message
)
237 static unsigned long last_msg
= 0;
238 static DEFINE_SPINLOCK(lock
);
243 atomic_inc(&audit_lost
);
245 print
= (audit_failure
== AUDIT_FAIL_PANIC
|| !audit_rate_limit
);
248 spin_lock_irqsave(&lock
, flags
);
250 if (now
- last_msg
> HZ
) {
254 spin_unlock_irqrestore(&lock
, flags
);
258 if (printk_ratelimit())
260 "audit: audit_lost=%d audit_rate_limit=%d "
261 "audit_backlog_limit=%d\n",
262 atomic_read(&audit_lost
),
264 audit_backlog_limit
);
265 audit_panic(message
);
269 static int audit_log_config_change(char *function_name
, int new, int old
,
272 struct audit_buffer
*ab
;
275 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_CONFIG_CHANGE
);
278 audit_log_format(ab
, "%s=%d old=%d", function_name
, new, old
);
279 audit_log_session_info(ab
);
280 rc
= audit_log_task_context(ab
);
282 allow_changes
= 0; /* Something weird, deny request */
283 audit_log_format(ab
, " res=%d", allow_changes
);
288 static int audit_do_config_change(char *function_name
, int *to_change
, int new)
290 int allow_changes
, rc
= 0, old
= *to_change
;
292 /* check if we are locked */
293 if (audit_enabled
== AUDIT_LOCKED
)
298 if (audit_enabled
!= AUDIT_OFF
) {
299 rc
= audit_log_config_change(function_name
, new, old
, allow_changes
);
304 /* If we are allowed, make the change */
305 if (allow_changes
== 1)
307 /* Not allowed, update reason */
313 static int audit_set_rate_limit(int limit
)
315 return audit_do_config_change("audit_rate_limit", &audit_rate_limit
, limit
);
318 static int audit_set_backlog_limit(int limit
)
320 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit
, limit
);
323 static int audit_set_enabled(int state
)
326 if (state
< AUDIT_OFF
|| state
> AUDIT_LOCKED
)
329 rc
= audit_do_config_change("audit_enabled", &audit_enabled
, state
);
331 audit_ever_enabled
|= !!state
;
336 static int audit_set_failure(int state
)
338 if (state
!= AUDIT_FAIL_SILENT
339 && state
!= AUDIT_FAIL_PRINTK
340 && state
!= AUDIT_FAIL_PANIC
)
343 return audit_do_config_change("audit_failure", &audit_failure
, state
);
347 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
348 * already have been sent via prink/syslog and so if these messages are dropped
349 * it is not a huge concern since we already passed the audit_log_lost()
350 * notification and stuff. This is just nice to get audit messages during
351 * boot before auditd is running or messages generated while auditd is stopped.
352 * This only holds messages is audit_default is set, aka booting with audit=1
353 * or building your kernel that way.
355 static void audit_hold_skb(struct sk_buff
*skb
)
358 skb_queue_len(&audit_skb_hold_queue
) < audit_backlog_limit
)
359 skb_queue_tail(&audit_skb_hold_queue
, skb
);
365 * For one reason or another this nlh isn't getting delivered to the userspace
366 * audit daemon, just send it to printk.
368 static void audit_printk_skb(struct sk_buff
*skb
)
370 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
371 char *data
= nlmsg_data(nlh
);
373 if (nlh
->nlmsg_type
!= AUDIT_EOE
) {
374 if (printk_ratelimit())
375 printk(KERN_NOTICE
"type=%d %s\n", nlh
->nlmsg_type
, data
);
377 audit_log_lost("printk limit exceeded\n");
383 static void kauditd_send_skb(struct sk_buff
*skb
)
386 /* take a reference in case we can't send it and we want to hold it */
388 err
= netlink_unicast(audit_sock
, skb
, audit_nlk_portid
, 0);
390 BUG_ON(err
!= -ECONNREFUSED
); /* Shouldn't happen */
391 printk(KERN_ERR
"audit: *NO* daemon at audit_pid=%d\n", audit_pid
);
392 audit_log_lost("auditd disappeared\n");
394 /* we might get lucky and get this in the next auditd */
397 /* drop the extra reference if sent ok */
402 * flush_hold_queue - empty the hold queue if auditd appears
404 * If auditd just started, drain the queue of messages already
405 * sent to syslog/printk. Remember loss here is ok. We already
406 * called audit_log_lost() if it didn't go out normally. so the
407 * race between the skb_dequeue and the next check for audit_pid
410 * If you ever find kauditd to be too slow we can get a perf win
411 * by doing our own locking and keeping better track if there
412 * are messages in this queue. I don't see the need now, but
413 * in 5 years when I want to play with this again I'll see this
414 * note and still have no friggin idea what i'm thinking today.
416 static void flush_hold_queue(void)
420 if (!audit_default
|| !audit_pid
)
423 skb
= skb_dequeue(&audit_skb_hold_queue
);
427 while (skb
&& audit_pid
) {
428 kauditd_send_skb(skb
);
429 skb
= skb_dequeue(&audit_skb_hold_queue
);
433 * if auditd just disappeared but we
434 * dequeued an skb we need to drop ref
440 static int kauditd_thread(void *dummy
)
443 while (!kthread_should_stop()) {
445 DECLARE_WAITQUEUE(wait
, current
);
449 skb
= skb_dequeue(&audit_skb_queue
);
450 wake_up(&audit_backlog_wait
);
453 kauditd_send_skb(skb
);
455 audit_printk_skb(skb
);
458 set_current_state(TASK_INTERRUPTIBLE
);
459 add_wait_queue(&kauditd_wait
, &wait
);
461 if (!skb_queue_len(&audit_skb_queue
)) {
466 __set_current_state(TASK_RUNNING
);
467 remove_wait_queue(&kauditd_wait
, &wait
);
472 int audit_send_list(void *_dest
)
474 struct audit_netlink_list
*dest
= _dest
;
478 /* wait for parent to finish and send an ACK */
479 mutex_lock(&audit_cmd_mutex
);
480 mutex_unlock(&audit_cmd_mutex
);
482 while ((skb
= __skb_dequeue(&dest
->q
)) != NULL
)
483 netlink_unicast(audit_sock
, skb
, pid
, 0);
490 struct sk_buff
*audit_make_reply(int pid
, int seq
, int type
, int done
,
491 int multi
, const void *payload
, int size
)
494 struct nlmsghdr
*nlh
;
496 int flags
= multi
? NLM_F_MULTI
: 0;
497 int t
= done
? NLMSG_DONE
: type
;
499 skb
= nlmsg_new(size
, GFP_KERNEL
);
503 nlh
= nlmsg_put(skb
, pid
, seq
, t
, size
, flags
);
506 data
= nlmsg_data(nlh
);
507 memcpy(data
, payload
, size
);
515 static int audit_send_reply_thread(void *arg
)
517 struct audit_reply
*reply
= (struct audit_reply
*)arg
;
519 mutex_lock(&audit_cmd_mutex
);
520 mutex_unlock(&audit_cmd_mutex
);
522 /* Ignore failure. It'll only happen if the sender goes away,
523 because our timeout is set to infinite. */
524 netlink_unicast(audit_sock
, reply
->skb
, reply
->pid
, 0);
529 * audit_send_reply - send an audit reply message via netlink
530 * @pid: process id to send reply to
531 * @seq: sequence number
532 * @type: audit message type
533 * @done: done (last) flag
534 * @multi: multi-part message flag
535 * @payload: payload data
536 * @size: payload size
538 * Allocates an skb, builds the netlink message, and sends it to the pid.
539 * No failure notifications.
541 static void audit_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
542 const void *payload
, int size
)
545 struct task_struct
*tsk
;
546 struct audit_reply
*reply
= kmalloc(sizeof(struct audit_reply
),
552 skb
= audit_make_reply(pid
, seq
, type
, done
, multi
, payload
, size
);
559 tsk
= kthread_run(audit_send_reply_thread
, reply
, "audit_send_reply");
568 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
571 static int audit_netlink_ok(struct sk_buff
*skb
, u16 msg_type
)
575 /* Only support the initial namespaces for now. */
576 if ((current_user_ns() != &init_user_ns
) ||
577 (task_active_pid_ns(current
) != &init_pid_ns
))
587 case AUDIT_LIST_RULES
:
590 case AUDIT_SIGNAL_INFO
:
594 case AUDIT_MAKE_EQUIV
:
595 if (!capable(CAP_AUDIT_CONTROL
))
599 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
600 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
601 if (!capable(CAP_AUDIT_WRITE
))
604 default: /* bad msg */
611 static int audit_log_common_recv_msg(struct audit_buffer
**ab
, u16 msg_type
)
614 uid_t uid
= from_kuid(&init_user_ns
, current_uid());
616 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
) {
621 *ab
= audit_log_start(NULL
, GFP_KERNEL
, msg_type
);
624 audit_log_format(*ab
, "pid=%d uid=%u", task_tgid_vnr(current
), uid
);
625 audit_log_session_info(*ab
);
626 audit_log_task_context(*ab
);
631 static int audit_receive_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
635 struct audit_status
*status_get
, status_set
;
637 struct audit_buffer
*ab
;
638 u16 msg_type
= nlh
->nlmsg_type
;
639 struct audit_sig_info
*sig_data
;
643 err
= audit_netlink_ok(skb
, msg_type
);
647 /* As soon as there's any sign of userspace auditd,
648 * start kauditd to talk to it */
650 kauditd_task
= kthread_run(kauditd_thread
, NULL
, "kauditd");
651 if (IS_ERR(kauditd_task
)) {
652 err
= PTR_ERR(kauditd_task
);
657 seq
= nlh
->nlmsg_seq
;
658 data
= nlmsg_data(nlh
);
663 status_set
.enabled
= audit_enabled
;
664 status_set
.failure
= audit_failure
;
665 status_set
.pid
= audit_pid
;
666 status_set
.rate_limit
= audit_rate_limit
;
667 status_set
.backlog_limit
= audit_backlog_limit
;
668 status_set
.lost
= atomic_read(&audit_lost
);
669 status_set
.backlog
= skb_queue_len(&audit_skb_queue
);
670 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_GET
, 0, 0,
671 &status_set
, sizeof(status_set
));
674 if (nlmsg_len(nlh
) < sizeof(struct audit_status
))
676 status_get
= (struct audit_status
*)data
;
677 if (status_get
->mask
& AUDIT_STATUS_ENABLED
) {
678 err
= audit_set_enabled(status_get
->enabled
);
682 if (status_get
->mask
& AUDIT_STATUS_FAILURE
) {
683 err
= audit_set_failure(status_get
->failure
);
687 if (status_get
->mask
& AUDIT_STATUS_PID
) {
688 int new_pid
= status_get
->pid
;
690 if (audit_enabled
!= AUDIT_OFF
)
691 audit_log_config_change("audit_pid", new_pid
, audit_pid
, 1);
693 audit_nlk_portid
= NETLINK_CB(skb
).portid
;
695 if (status_get
->mask
& AUDIT_STATUS_RATE_LIMIT
) {
696 err
= audit_set_rate_limit(status_get
->rate_limit
);
700 if (status_get
->mask
& AUDIT_STATUS_BACKLOG_LIMIT
)
701 err
= audit_set_backlog_limit(status_get
->backlog_limit
);
704 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
705 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
706 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
)
709 err
= audit_filter_user(msg_type
);
712 if (msg_type
== AUDIT_USER_TTY
) {
713 err
= tty_audit_push_current();
717 audit_log_common_recv_msg(&ab
, msg_type
);
718 if (msg_type
!= AUDIT_USER_TTY
)
719 audit_log_format(ab
, " msg='%.1024s'",
724 audit_log_format(ab
, " data=");
725 size
= nlmsg_len(nlh
);
727 ((unsigned char *)data
)[size
- 1] == '\0')
729 audit_log_n_untrustedstring(ab
, data
, size
);
731 audit_set_pid(ab
, NETLINK_CB(skb
).portid
);
737 if (nlmsg_len(nlh
) < sizeof(struct audit_rule_data
))
739 if (audit_enabled
== AUDIT_LOCKED
) {
740 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
741 audit_log_format(ab
, " audit_enabled=%d res=0", audit_enabled
);
746 case AUDIT_LIST_RULES
:
747 err
= audit_receive_filter(msg_type
, NETLINK_CB(skb
).portid
,
748 seq
, data
, nlmsg_len(nlh
));
752 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
753 audit_log_format(ab
, " op=trim res=1");
756 case AUDIT_MAKE_EQUIV
: {
759 size_t msglen
= nlmsg_len(nlh
);
763 if (msglen
< 2 * sizeof(u32
))
765 memcpy(sizes
, bufp
, 2 * sizeof(u32
));
766 bufp
+= 2 * sizeof(u32
);
767 msglen
-= 2 * sizeof(u32
);
768 old
= audit_unpack_string(&bufp
, &msglen
, sizes
[0]);
773 new = audit_unpack_string(&bufp
, &msglen
, sizes
[1]);
779 /* OK, here comes... */
780 err
= audit_tag_tree(old
, new);
782 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
784 audit_log_format(ab
, " op=make_equiv old=");
785 audit_log_untrustedstring(ab
, old
);
786 audit_log_format(ab
, " new=");
787 audit_log_untrustedstring(ab
, new);
788 audit_log_format(ab
, " res=%d", !err
);
794 case AUDIT_SIGNAL_INFO
:
797 err
= security_secid_to_secctx(audit_sig_sid
, &ctx
, &len
);
801 sig_data
= kmalloc(sizeof(*sig_data
) + len
, GFP_KERNEL
);
804 security_release_secctx(ctx
, len
);
807 sig_data
->uid
= from_kuid(&init_user_ns
, audit_sig_uid
);
808 sig_data
->pid
= audit_sig_pid
;
810 memcpy(sig_data
->ctx
, ctx
, len
);
811 security_release_secctx(ctx
, len
);
813 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_SIGNAL_INFO
,
814 0, 0, sig_data
, sizeof(*sig_data
) + len
);
817 case AUDIT_TTY_GET
: {
818 struct audit_tty_status s
;
819 struct task_struct
*tsk
= current
;
821 spin_lock(&tsk
->sighand
->siglock
);
822 s
.enabled
= tsk
->signal
->audit_tty
!= 0;
823 s
.log_passwd
= tsk
->signal
->audit_tty_log_passwd
;
824 spin_unlock(&tsk
->sighand
->siglock
);
826 audit_send_reply(NETLINK_CB(skb
).portid
, seq
,
827 AUDIT_TTY_GET
, 0, 0, &s
, sizeof(s
));
830 case AUDIT_TTY_SET
: {
831 struct audit_tty_status s
;
832 struct task_struct
*tsk
= current
;
834 memset(&s
, 0, sizeof(s
));
835 /* guard against past and future API changes */
836 memcpy(&s
, data
, min_t(size_t, sizeof(s
), nlmsg_len(nlh
)));
837 if ((s
.enabled
!= 0 && s
.enabled
!= 1) ||
838 (s
.log_passwd
!= 0 && s
.log_passwd
!= 1))
841 spin_lock(&tsk
->sighand
->siglock
);
842 tsk
->signal
->audit_tty
= s
.enabled
;
843 tsk
->signal
->audit_tty_log_passwd
= s
.log_passwd
;
844 spin_unlock(&tsk
->sighand
->siglock
);
852 return err
< 0 ? err
: 0;
856 * Get message from skb. Each message is processed by audit_receive_msg.
857 * Malformed skbs with wrong length are discarded silently.
859 static void audit_receive_skb(struct sk_buff
*skb
)
861 struct nlmsghdr
*nlh
;
863 * len MUST be signed for nlmsg_next to be able to dec it below 0
864 * if the nlmsg_len was not aligned
869 nlh
= nlmsg_hdr(skb
);
872 while (nlmsg_ok(nlh
, len
)) {
873 err
= audit_receive_msg(skb
, nlh
);
874 /* if err or if this message says it wants a response */
875 if (err
|| (nlh
->nlmsg_flags
& NLM_F_ACK
))
876 netlink_ack(skb
, nlh
, err
);
878 nlh
= nlmsg_next(nlh
, &len
);
882 /* Receive messages from netlink socket. */
883 static void audit_receive(struct sk_buff
*skb
)
885 mutex_lock(&audit_cmd_mutex
);
886 audit_receive_skb(skb
);
887 mutex_unlock(&audit_cmd_mutex
);
890 /* Initialize audit support at boot time. */
891 static int __init
audit_init(void)
894 struct netlink_kernel_cfg cfg
= {
895 .input
= audit_receive
,
898 if (audit_initialized
== AUDIT_DISABLED
)
901 printk(KERN_INFO
"audit: initializing netlink socket (%s)\n",
902 audit_default
? "enabled" : "disabled");
903 audit_sock
= netlink_kernel_create(&init_net
, NETLINK_AUDIT
, &cfg
);
905 audit_panic("cannot initialize netlink socket");
907 audit_sock
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
909 skb_queue_head_init(&audit_skb_queue
);
910 skb_queue_head_init(&audit_skb_hold_queue
);
911 audit_initialized
= AUDIT_INITIALIZED
;
912 audit_enabled
= audit_default
;
913 audit_ever_enabled
|= !!audit_default
;
915 audit_log(NULL
, GFP_KERNEL
, AUDIT_KERNEL
, "initialized");
917 for (i
= 0; i
< AUDIT_INODE_BUCKETS
; i
++)
918 INIT_LIST_HEAD(&audit_inode_hash
[i
]);
922 __initcall(audit_init
);
924 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
925 static int __init
audit_enable(char *str
)
927 audit_default
= !!simple_strtol(str
, NULL
, 0);
929 audit_initialized
= AUDIT_DISABLED
;
931 printk(KERN_INFO
"audit: %s", audit_default
? "enabled" : "disabled");
933 if (audit_initialized
== AUDIT_INITIALIZED
) {
934 audit_enabled
= audit_default
;
935 audit_ever_enabled
|= !!audit_default
;
936 } else if (audit_initialized
== AUDIT_UNINITIALIZED
) {
937 printk(" (after initialization)");
939 printk(" (until reboot)");
946 __setup("audit=", audit_enable
);
948 static void audit_buffer_free(struct audit_buffer
*ab
)
958 spin_lock_irqsave(&audit_freelist_lock
, flags
);
959 if (audit_freelist_count
> AUDIT_MAXFREE
)
962 audit_freelist_count
++;
963 list_add(&ab
->list
, &audit_freelist
);
965 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
968 static struct audit_buffer
* audit_buffer_alloc(struct audit_context
*ctx
,
969 gfp_t gfp_mask
, int type
)
972 struct audit_buffer
*ab
= NULL
;
973 struct nlmsghdr
*nlh
;
975 spin_lock_irqsave(&audit_freelist_lock
, flags
);
976 if (!list_empty(&audit_freelist
)) {
977 ab
= list_entry(audit_freelist
.next
,
978 struct audit_buffer
, list
);
980 --audit_freelist_count
;
982 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
985 ab
= kmalloc(sizeof(*ab
), gfp_mask
);
991 ab
->gfp_mask
= gfp_mask
;
993 ab
->skb
= nlmsg_new(AUDIT_BUFSIZ
, gfp_mask
);
997 nlh
= nlmsg_put(ab
->skb
, 0, 0, type
, 0, 0);
1007 audit_buffer_free(ab
);
1012 * audit_serial - compute a serial number for the audit record
1014 * Compute a serial number for the audit record. Audit records are
1015 * written to user-space as soon as they are generated, so a complete
1016 * audit record may be written in several pieces. The timestamp of the
1017 * record and this serial number are used by the user-space tools to
1018 * determine which pieces belong to the same audit record. The
1019 * (timestamp,serial) tuple is unique for each syscall and is live from
1020 * syscall entry to syscall exit.
1022 * NOTE: Another possibility is to store the formatted records off the
1023 * audit context (for those records that have a context), and emit them
1024 * all at syscall exit. However, this could delay the reporting of
1025 * significant errors until syscall exit (or never, if the system
1028 unsigned int audit_serial(void)
1030 static DEFINE_SPINLOCK(serial_lock
);
1031 static unsigned int serial
= 0;
1033 unsigned long flags
;
1036 spin_lock_irqsave(&serial_lock
, flags
);
1039 } while (unlikely(!ret
));
1040 spin_unlock_irqrestore(&serial_lock
, flags
);
1045 static inline void audit_get_stamp(struct audit_context
*ctx
,
1046 struct timespec
*t
, unsigned int *serial
)
1048 if (!ctx
|| !auditsc_get_stamp(ctx
, t
, serial
)) {
1050 *serial
= audit_serial();
1055 * Wait for auditd to drain the queue a little
1057 static void wait_for_auditd(unsigned long sleep_time
)
1059 DECLARE_WAITQUEUE(wait
, current
);
1060 set_current_state(TASK_UNINTERRUPTIBLE
);
1061 add_wait_queue(&audit_backlog_wait
, &wait
);
1063 if (audit_backlog_limit
&&
1064 skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
)
1065 schedule_timeout(sleep_time
);
1067 __set_current_state(TASK_RUNNING
);
1068 remove_wait_queue(&audit_backlog_wait
, &wait
);
1071 /* Obtain an audit buffer. This routine does locking to obtain the
1072 * audit buffer, but then no locking is required for calls to
1073 * audit_log_*format. If the tsk is a task that is currently in a
1074 * syscall, then the syscall is marked as auditable and an audit record
1075 * will be written at syscall exit. If there is no associated task, tsk
1076 * should be NULL. */
1079 * audit_log_start - obtain an audit buffer
1080 * @ctx: audit_context (may be NULL)
1081 * @gfp_mask: type of allocation
1082 * @type: audit message type
1084 * Returns audit_buffer pointer on success or NULL on error.
1086 * Obtain an audit buffer. This routine does locking to obtain the
1087 * audit buffer, but then no locking is required for calls to
1088 * audit_log_*format. If the task (ctx) is a task that is currently in a
1089 * syscall, then the syscall is marked as auditable and an audit record
1090 * will be written at syscall exit. If there is no associated task, then
1091 * task context (ctx) should be NULL.
1093 struct audit_buffer
*audit_log_start(struct audit_context
*ctx
, gfp_t gfp_mask
,
1096 struct audit_buffer
*ab
= NULL
;
1098 unsigned int uninitialized_var(serial
);
1100 unsigned long timeout_start
= jiffies
;
1102 if (audit_initialized
!= AUDIT_INITIALIZED
)
1105 if (unlikely(audit_filter_type(type
)))
1108 if (gfp_mask
& __GFP_WAIT
)
1111 reserve
= 5; /* Allow atomic callers to go up to five
1112 entries over the normal backlog limit */
1114 while (audit_backlog_limit
1115 && skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
+ reserve
) {
1116 if (gfp_mask
& __GFP_WAIT
&& audit_backlog_wait_time
) {
1117 unsigned long sleep_time
;
1119 sleep_time
= timeout_start
+ audit_backlog_wait_time
-
1121 if ((long)sleep_time
> 0) {
1122 wait_for_auditd(sleep_time
);
1126 if (audit_rate_check() && printk_ratelimit())
1128 "audit: audit_backlog=%d > "
1129 "audit_backlog_limit=%d\n",
1130 skb_queue_len(&audit_skb_queue
),
1131 audit_backlog_limit
);
1132 audit_log_lost("backlog limit exceeded");
1133 audit_backlog_wait_time
= audit_backlog_wait_overflow
;
1134 wake_up(&audit_backlog_wait
);
1138 ab
= audit_buffer_alloc(ctx
, gfp_mask
, type
);
1140 audit_log_lost("out of memory in audit_log_start");
1144 audit_get_stamp(ab
->ctx
, &t
, &serial
);
1146 audit_log_format(ab
, "audit(%lu.%03lu:%u): ",
1147 t
.tv_sec
, t
.tv_nsec
/1000000, serial
);
1152 * audit_expand - expand skb in the audit buffer
1154 * @extra: space to add at tail of the skb
1156 * Returns 0 (no space) on failed expansion, or available space if
1159 static inline int audit_expand(struct audit_buffer
*ab
, int extra
)
1161 struct sk_buff
*skb
= ab
->skb
;
1162 int oldtail
= skb_tailroom(skb
);
1163 int ret
= pskb_expand_head(skb
, 0, extra
, ab
->gfp_mask
);
1164 int newtail
= skb_tailroom(skb
);
1167 audit_log_lost("out of memory in audit_expand");
1171 skb
->truesize
+= newtail
- oldtail
;
1176 * Format an audit message into the audit buffer. If there isn't enough
1177 * room in the audit buffer, more room will be allocated and vsnprint
1178 * will be called a second time. Currently, we assume that a printk
1179 * can't format message larger than 1024 bytes, so we don't either.
1181 static void audit_log_vformat(struct audit_buffer
*ab
, const char *fmt
,
1185 struct sk_buff
*skb
;
1193 avail
= skb_tailroom(skb
);
1195 avail
= audit_expand(ab
, AUDIT_BUFSIZ
);
1199 va_copy(args2
, args
);
1200 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args
);
1202 /* The printk buffer is 1024 bytes long, so if we get
1203 * here and AUDIT_BUFSIZ is at least 1024, then we can
1204 * log everything that printk could have logged. */
1205 avail
= audit_expand(ab
,
1206 max_t(unsigned, AUDIT_BUFSIZ
, 1+len
-avail
));
1209 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args2
);
1220 * audit_log_format - format a message into the audit buffer.
1222 * @fmt: format string
1223 * @...: optional parameters matching @fmt string
1225 * All the work is done in audit_log_vformat.
1227 void audit_log_format(struct audit_buffer
*ab
, const char *fmt
, ...)
1233 va_start(args
, fmt
);
1234 audit_log_vformat(ab
, fmt
, args
);
1239 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1240 * @ab: the audit_buffer
1241 * @buf: buffer to convert to hex
1242 * @len: length of @buf to be converted
1244 * No return value; failure to expand is silently ignored.
1246 * This function will take the passed buf and convert it into a string of
1247 * ascii hex digits. The new string is placed onto the skb.
1249 void audit_log_n_hex(struct audit_buffer
*ab
, const unsigned char *buf
,
1252 int i
, avail
, new_len
;
1254 struct sk_buff
*skb
;
1255 static const unsigned char *hex
= "0123456789ABCDEF";
1262 avail
= skb_tailroom(skb
);
1264 if (new_len
>= avail
) {
1265 /* Round the buffer request up to the next multiple */
1266 new_len
= AUDIT_BUFSIZ
*(((new_len
-avail
)/AUDIT_BUFSIZ
) + 1);
1267 avail
= audit_expand(ab
, new_len
);
1272 ptr
= skb_tail_pointer(skb
);
1273 for (i
=0; i
<len
; i
++) {
1274 *ptr
++ = hex
[(buf
[i
] & 0xF0)>>4]; /* Upper nibble */
1275 *ptr
++ = hex
[buf
[i
] & 0x0F]; /* Lower nibble */
1278 skb_put(skb
, len
<< 1); /* new string is twice the old string */
1282 * Format a string of no more than slen characters into the audit buffer,
1283 * enclosed in quote marks.
1285 void audit_log_n_string(struct audit_buffer
*ab
, const char *string
,
1290 struct sk_buff
*skb
;
1297 avail
= skb_tailroom(skb
);
1298 new_len
= slen
+ 3; /* enclosing quotes + null terminator */
1299 if (new_len
> avail
) {
1300 avail
= audit_expand(ab
, new_len
);
1304 ptr
= skb_tail_pointer(skb
);
1306 memcpy(ptr
, string
, slen
);
1310 skb_put(skb
, slen
+ 2); /* don't include null terminator */
1314 * audit_string_contains_control - does a string need to be logged in hex
1315 * @string: string to be checked
1316 * @len: max length of the string to check
1318 int audit_string_contains_control(const char *string
, size_t len
)
1320 const unsigned char *p
;
1321 for (p
= string
; p
< (const unsigned char *)string
+ len
; p
++) {
1322 if (*p
== '"' || *p
< 0x21 || *p
> 0x7e)
1329 * audit_log_n_untrustedstring - log a string that may contain random characters
1331 * @len: length of string (not including trailing null)
1332 * @string: string to be logged
1334 * This code will escape a string that is passed to it if the string
1335 * contains a control character, unprintable character, double quote mark,
1336 * or a space. Unescaped strings will start and end with a double quote mark.
1337 * Strings that are escaped are printed in hex (2 digits per char).
1339 * The caller specifies the number of characters in the string to log, which may
1340 * or may not be the entire string.
1342 void audit_log_n_untrustedstring(struct audit_buffer
*ab
, const char *string
,
1345 if (audit_string_contains_control(string
, len
))
1346 audit_log_n_hex(ab
, string
, len
);
1348 audit_log_n_string(ab
, string
, len
);
1352 * audit_log_untrustedstring - log a string that may contain random characters
1354 * @string: string to be logged
1356 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1357 * determine string length.
1359 void audit_log_untrustedstring(struct audit_buffer
*ab
, const char *string
)
1361 audit_log_n_untrustedstring(ab
, string
, strlen(string
));
1364 /* This is a helper-function to print the escaped d_path */
1365 void audit_log_d_path(struct audit_buffer
*ab
, const char *prefix
,
1366 const struct path
*path
)
1371 audit_log_format(ab
, "%s", prefix
);
1373 /* We will allow 11 spaces for ' (deleted)' to be appended */
1374 pathname
= kmalloc(PATH_MAX
+11, ab
->gfp_mask
);
1376 audit_log_string(ab
, "<no_memory>");
1379 p
= d_path(path
, pathname
, PATH_MAX
+11);
1380 if (IS_ERR(p
)) { /* Should never happen since we send PATH_MAX */
1381 /* FIXME: can we save some information here? */
1382 audit_log_string(ab
, "<too_long>");
1384 audit_log_untrustedstring(ab
, p
);
1388 void audit_log_session_info(struct audit_buffer
*ab
)
1390 u32 sessionid
= audit_get_sessionid(current
);
1391 uid_t auid
= from_kuid(&init_user_ns
, audit_get_loginuid(current
));
1393 audit_log_format(ab
, " auid=%u ses=%u\n", auid
, sessionid
);
1396 void audit_log_key(struct audit_buffer
*ab
, char *key
)
1398 audit_log_format(ab
, " key=");
1400 audit_log_untrustedstring(ab
, key
);
1402 audit_log_format(ab
, "(null)");
1405 void audit_log_cap(struct audit_buffer
*ab
, char *prefix
, kernel_cap_t
*cap
)
1409 audit_log_format(ab
, " %s=", prefix
);
1410 CAP_FOR_EACH_U32(i
) {
1411 audit_log_format(ab
, "%08x",
1412 cap
->cap
[(_KERNEL_CAPABILITY_U32S
-1) - i
]);
1416 void audit_log_fcaps(struct audit_buffer
*ab
, struct audit_names
*name
)
1418 kernel_cap_t
*perm
= &name
->fcap
.permitted
;
1419 kernel_cap_t
*inh
= &name
->fcap
.inheritable
;
1422 if (!cap_isclear(*perm
)) {
1423 audit_log_cap(ab
, "cap_fp", perm
);
1426 if (!cap_isclear(*inh
)) {
1427 audit_log_cap(ab
, "cap_fi", inh
);
1432 audit_log_format(ab
, " cap_fe=%d cap_fver=%x",
1433 name
->fcap
.fE
, name
->fcap_ver
);
1436 static inline int audit_copy_fcaps(struct audit_names
*name
,
1437 const struct dentry
*dentry
)
1439 struct cpu_vfs_cap_data caps
;
1445 rc
= get_vfs_caps_from_disk(dentry
, &caps
);
1449 name
->fcap
.permitted
= caps
.permitted
;
1450 name
->fcap
.inheritable
= caps
.inheritable
;
1451 name
->fcap
.fE
= !!(caps
.magic_etc
& VFS_CAP_FLAGS_EFFECTIVE
);
1452 name
->fcap_ver
= (caps
.magic_etc
& VFS_CAP_REVISION_MASK
) >>
1453 VFS_CAP_REVISION_SHIFT
;
1458 /* Copy inode data into an audit_names. */
1459 void audit_copy_inode(struct audit_names
*name
, const struct dentry
*dentry
,
1460 const struct inode
*inode
)
1462 name
->ino
= inode
->i_ino
;
1463 name
->dev
= inode
->i_sb
->s_dev
;
1464 name
->mode
= inode
->i_mode
;
1465 name
->uid
= inode
->i_uid
;
1466 name
->gid
= inode
->i_gid
;
1467 name
->rdev
= inode
->i_rdev
;
1468 security_inode_getsecid(inode
, &name
->osid
);
1469 audit_copy_fcaps(name
, dentry
);
1473 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1474 * @context: audit_context for the task
1475 * @n: audit_names structure with reportable details
1476 * @path: optional path to report instead of audit_names->name
1477 * @record_num: record number to report when handling a list of names
1478 * @call_panic: optional pointer to int that will be updated if secid fails
1480 void audit_log_name(struct audit_context
*context
, struct audit_names
*n
,
1481 struct path
*path
, int record_num
, int *call_panic
)
1483 struct audit_buffer
*ab
;
1484 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_PATH
);
1488 audit_log_format(ab
, "item=%d", record_num
);
1491 audit_log_d_path(ab
, " name=", path
);
1493 switch (n
->name_len
) {
1494 case AUDIT_NAME_FULL
:
1495 /* log the full path */
1496 audit_log_format(ab
, " name=");
1497 audit_log_untrustedstring(ab
, n
->name
->name
);
1500 /* name was specified as a relative path and the
1501 * directory component is the cwd */
1502 audit_log_d_path(ab
, " name=", &context
->pwd
);
1505 /* log the name's directory component */
1506 audit_log_format(ab
, " name=");
1507 audit_log_n_untrustedstring(ab
, n
->name
->name
,
1511 audit_log_format(ab
, " name=(null)");
1513 if (n
->ino
!= (unsigned long)-1) {
1514 audit_log_format(ab
, " inode=%lu"
1515 " dev=%02x:%02x mode=%#ho"
1516 " ouid=%u ogid=%u rdev=%02x:%02x",
1521 from_kuid(&init_user_ns
, n
->uid
),
1522 from_kgid(&init_user_ns
, n
->gid
),
1529 if (security_secid_to_secctx(
1530 n
->osid
, &ctx
, &len
)) {
1531 audit_log_format(ab
, " osid=%u", n
->osid
);
1535 audit_log_format(ab
, " obj=%s", ctx
);
1536 security_release_secctx(ctx
, len
);
1540 /* log the audit_names record type */
1541 audit_log_format(ab
, " nametype=");
1543 case AUDIT_TYPE_NORMAL
:
1544 audit_log_format(ab
, "NORMAL");
1546 case AUDIT_TYPE_PARENT
:
1547 audit_log_format(ab
, "PARENT");
1549 case AUDIT_TYPE_CHILD_DELETE
:
1550 audit_log_format(ab
, "DELETE");
1552 case AUDIT_TYPE_CHILD_CREATE
:
1553 audit_log_format(ab
, "CREATE");
1556 audit_log_format(ab
, "UNKNOWN");
1560 audit_log_fcaps(ab
, n
);
1564 int audit_log_task_context(struct audit_buffer
*ab
)
1571 security_task_getsecid(current
, &sid
);
1575 error
= security_secid_to_secctx(sid
, &ctx
, &len
);
1577 if (error
!= -EINVAL
)
1582 audit_log_format(ab
, " subj=%s", ctx
);
1583 security_release_secctx(ctx
, len
);
1587 audit_panic("error in audit_log_task_context");
1590 EXPORT_SYMBOL(audit_log_task_context
);
1592 void audit_log_task_info(struct audit_buffer
*ab
, struct task_struct
*tsk
)
1594 const struct cred
*cred
;
1595 char name
[sizeof(tsk
->comm
)];
1596 struct mm_struct
*mm
= tsk
->mm
;
1602 /* tsk == current */
1603 cred
= current_cred();
1605 spin_lock_irq(&tsk
->sighand
->siglock
);
1606 if (tsk
->signal
&& tsk
->signal
->tty
&& tsk
->signal
->tty
->name
)
1607 tty
= tsk
->signal
->tty
->name
;
1610 spin_unlock_irq(&tsk
->sighand
->siglock
);
1612 audit_log_format(ab
,
1613 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1614 " euid=%u suid=%u fsuid=%u"
1615 " egid=%u sgid=%u fsgid=%u ses=%u tty=%s",
1618 from_kuid(&init_user_ns
, audit_get_loginuid(tsk
)),
1619 from_kuid(&init_user_ns
, cred
->uid
),
1620 from_kgid(&init_user_ns
, cred
->gid
),
1621 from_kuid(&init_user_ns
, cred
->euid
),
1622 from_kuid(&init_user_ns
, cred
->suid
),
1623 from_kuid(&init_user_ns
, cred
->fsuid
),
1624 from_kgid(&init_user_ns
, cred
->egid
),
1625 from_kgid(&init_user_ns
, cred
->sgid
),
1626 from_kgid(&init_user_ns
, cred
->fsgid
),
1627 audit_get_sessionid(tsk
), tty
);
1629 get_task_comm(name
, tsk
);
1630 audit_log_format(ab
, " comm=");
1631 audit_log_untrustedstring(ab
, name
);
1634 down_read(&mm
->mmap_sem
);
1636 audit_log_d_path(ab
, " exe=", &mm
->exe_file
->f_path
);
1637 up_read(&mm
->mmap_sem
);
1639 audit_log_task_context(ab
);
1641 EXPORT_SYMBOL(audit_log_task_info
);
1644 * audit_log_link_denied - report a link restriction denial
1645 * @operation: specific link opreation
1646 * @link: the path that triggered the restriction
1648 void audit_log_link_denied(const char *operation
, struct path
*link
)
1650 struct audit_buffer
*ab
;
1651 struct audit_names
*name
;
1653 name
= kzalloc(sizeof(*name
), GFP_NOFS
);
1657 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1658 ab
= audit_log_start(current
->audit_context
, GFP_KERNEL
,
1662 audit_log_format(ab
, "op=%s", operation
);
1663 audit_log_task_info(ab
, current
);
1664 audit_log_format(ab
, " res=0");
1667 /* Generate AUDIT_PATH record with object. */
1668 name
->type
= AUDIT_TYPE_NORMAL
;
1669 audit_copy_inode(name
, link
->dentry
, link
->dentry
->d_inode
);
1670 audit_log_name(current
->audit_context
, name
, link
, 0, NULL
);
1676 * audit_log_end - end one audit record
1677 * @ab: the audit_buffer
1679 * The netlink_* functions cannot be called inside an irq context, so
1680 * the audit buffer is placed on a queue and a tasklet is scheduled to
1681 * remove them from the queue outside the irq context. May be called in
1684 void audit_log_end(struct audit_buffer
*ab
)
1688 if (!audit_rate_check()) {
1689 audit_log_lost("rate limit exceeded");
1691 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
1692 nlh
->nlmsg_len
= ab
->skb
->len
- NLMSG_HDRLEN
;
1695 skb_queue_tail(&audit_skb_queue
, ab
->skb
);
1696 wake_up_interruptible(&kauditd_wait
);
1698 audit_printk_skb(ab
->skb
);
1702 audit_buffer_free(ab
);
1706 * audit_log - Log an audit record
1707 * @ctx: audit context
1708 * @gfp_mask: type of allocation
1709 * @type: audit message type
1710 * @fmt: format string to use
1711 * @...: variable parameters matching the format string
1713 * This is a convenience function that calls audit_log_start,
1714 * audit_log_vformat, and audit_log_end. It may be called
1717 void audit_log(struct audit_context
*ctx
, gfp_t gfp_mask
, int type
,
1718 const char *fmt
, ...)
1720 struct audit_buffer
*ab
;
1723 ab
= audit_log_start(ctx
, gfp_mask
, type
);
1725 va_start(args
, fmt
);
1726 audit_log_vformat(ab
, fmt
, args
);
1732 #ifdef CONFIG_SECURITY
1734 * audit_log_secctx - Converts and logs SELinux context
1736 * @secid: security number
1738 * This is a helper function that calls security_secid_to_secctx to convert
1739 * secid to secctx and then adds the (converted) SELinux context to the audit
1740 * log by calling audit_log_format, thus also preventing leak of internal secid
1741 * to userspace. If secid cannot be converted audit_panic is called.
1743 void audit_log_secctx(struct audit_buffer
*ab
, u32 secid
)
1748 if (security_secid_to_secctx(secid
, &secctx
, &len
)) {
1749 audit_panic("Cannot convert secid to context");
1751 audit_log_format(ab
, " obj=%s", secctx
);
1752 security_release_secctx(secctx
, len
);
1755 EXPORT_SYMBOL(audit_log_secctx
);
1758 EXPORT_SYMBOL(audit_log_start
);
1759 EXPORT_SYMBOL(audit_log_end
);
1760 EXPORT_SYMBOL(audit_log_format
);
1761 EXPORT_SYMBOL(audit_log
);