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 #define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
107 static int audit_backlog_wait_time
= AUDIT_BACKLOG_WAIT_TIME
;
108 static int audit_backlog_wait_overflow
= 0;
110 /* The identity of the user shutting down the audit system. */
111 kuid_t audit_sig_uid
= INVALID_UID
;
112 pid_t audit_sig_pid
= -1;
113 u32 audit_sig_sid
= 0;
115 /* Records can be lost in several ways:
116 0) [suppressed in audit_alloc]
117 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
118 2) out of memory in audit_log_move [alloc_skb]
119 3) suppressed due to audit_rate_limit
120 4) suppressed due to audit_backlog_limit
122 static atomic_t audit_lost
= ATOMIC_INIT(0);
124 /* The netlink socket. */
125 static struct sock
*audit_sock
;
127 /* Hash for inode-based rules */
128 struct list_head audit_inode_hash
[AUDIT_INODE_BUCKETS
];
130 /* The audit_freelist is a list of pre-allocated audit buffers (if more
131 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
132 * being placed on the freelist). */
133 static DEFINE_SPINLOCK(audit_freelist_lock
);
134 static int audit_freelist_count
;
135 static LIST_HEAD(audit_freelist
);
137 static struct sk_buff_head audit_skb_queue
;
138 /* queue of skbs to send to auditd when/if it comes back */
139 static struct sk_buff_head audit_skb_hold_queue
;
140 static struct task_struct
*kauditd_task
;
141 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait
);
142 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait
);
144 /* Serialize requests from userspace. */
145 DEFINE_MUTEX(audit_cmd_mutex
);
147 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
148 * audit records. Since printk uses a 1024 byte buffer, this buffer
149 * should be at least that large. */
150 #define AUDIT_BUFSIZ 1024
152 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
153 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
154 #define AUDIT_MAXFREE (2*NR_CPUS)
156 /* The audit_buffer is used when formatting an audit record. The caller
157 * locks briefly to get the record off the freelist or to allocate the
158 * buffer, and locks briefly to send the buffer to the netlink layer or
159 * to place it on a transmit queue. Multiple audit_buffers can be in
160 * use simultaneously. */
161 struct audit_buffer
{
162 struct list_head list
;
163 struct sk_buff
*skb
; /* formatted skb ready to send */
164 struct audit_context
*ctx
; /* NULL or associated context */
173 static void audit_set_pid(struct audit_buffer
*ab
, pid_t pid
)
176 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
177 nlh
->nlmsg_pid
= pid
;
181 void audit_panic(const char *message
)
183 switch (audit_failure
)
185 case AUDIT_FAIL_SILENT
:
187 case AUDIT_FAIL_PRINTK
:
188 if (printk_ratelimit())
189 printk(KERN_ERR
"audit: %s\n", message
);
191 case AUDIT_FAIL_PANIC
:
192 /* test audit_pid since printk is always losey, why bother? */
194 panic("audit: %s\n", message
);
199 static inline int audit_rate_check(void)
201 static unsigned long last_check
= 0;
202 static int messages
= 0;
203 static DEFINE_SPINLOCK(lock
);
206 unsigned long elapsed
;
209 if (!audit_rate_limit
) return 1;
211 spin_lock_irqsave(&lock
, flags
);
212 if (++messages
< audit_rate_limit
) {
216 elapsed
= now
- last_check
;
223 spin_unlock_irqrestore(&lock
, flags
);
229 * audit_log_lost - conditionally log lost audit message event
230 * @message: the message stating reason for lost audit message
232 * Emit at least 1 message per second, even if audit_rate_check is
234 * Always increment the lost messages counter.
236 void audit_log_lost(const char *message
)
238 static unsigned long last_msg
= 0;
239 static DEFINE_SPINLOCK(lock
);
244 atomic_inc(&audit_lost
);
246 print
= (audit_failure
== AUDIT_FAIL_PANIC
|| !audit_rate_limit
);
249 spin_lock_irqsave(&lock
, flags
);
251 if (now
- last_msg
> HZ
) {
255 spin_unlock_irqrestore(&lock
, flags
);
259 if (printk_ratelimit())
261 "audit: audit_lost=%d audit_rate_limit=%d "
262 "audit_backlog_limit=%d\n",
263 atomic_read(&audit_lost
),
265 audit_backlog_limit
);
266 audit_panic(message
);
270 static int audit_log_config_change(char *function_name
, int new, int old
,
273 struct audit_buffer
*ab
;
276 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_CONFIG_CHANGE
);
279 audit_log_format(ab
, "%s=%d old=%d", function_name
, new, old
);
280 audit_log_session_info(ab
);
281 rc
= audit_log_task_context(ab
);
283 allow_changes
= 0; /* Something weird, deny request */
284 audit_log_format(ab
, " res=%d", allow_changes
);
289 static int audit_do_config_change(char *function_name
, int *to_change
, int new)
291 int allow_changes
, rc
= 0, old
= *to_change
;
293 /* check if we are locked */
294 if (audit_enabled
== AUDIT_LOCKED
)
299 if (audit_enabled
!= AUDIT_OFF
) {
300 rc
= audit_log_config_change(function_name
, new, old
, allow_changes
);
305 /* If we are allowed, make the change */
306 if (allow_changes
== 1)
308 /* Not allowed, update reason */
314 static int audit_set_rate_limit(int limit
)
316 return audit_do_config_change("audit_rate_limit", &audit_rate_limit
, limit
);
319 static int audit_set_backlog_limit(int limit
)
321 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit
, limit
);
324 static int audit_set_enabled(int state
)
327 if (state
< AUDIT_OFF
|| state
> AUDIT_LOCKED
)
330 rc
= audit_do_config_change("audit_enabled", &audit_enabled
, state
);
332 audit_ever_enabled
|= !!state
;
337 static int audit_set_failure(int state
)
339 if (state
!= AUDIT_FAIL_SILENT
340 && state
!= AUDIT_FAIL_PRINTK
341 && state
!= AUDIT_FAIL_PANIC
)
344 return audit_do_config_change("audit_failure", &audit_failure
, state
);
348 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
349 * already have been sent via prink/syslog and so if these messages are dropped
350 * it is not a huge concern since we already passed the audit_log_lost()
351 * notification and stuff. This is just nice to get audit messages during
352 * boot before auditd is running or messages generated while auditd is stopped.
353 * This only holds messages is audit_default is set, aka booting with audit=1
354 * or building your kernel that way.
356 static void audit_hold_skb(struct sk_buff
*skb
)
359 skb_queue_len(&audit_skb_hold_queue
) < audit_backlog_limit
)
360 skb_queue_tail(&audit_skb_hold_queue
, skb
);
366 * For one reason or another this nlh isn't getting delivered to the userspace
367 * audit daemon, just send it to printk.
369 static void audit_printk_skb(struct sk_buff
*skb
)
371 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
372 char *data
= nlmsg_data(nlh
);
374 if (nlh
->nlmsg_type
!= AUDIT_EOE
) {
375 if (printk_ratelimit()){
376 printk(KERN_NOTICE
"type=%d %s\n", nlh
->nlmsg_type
, data
);
379 audit_log_lost("printk limit exceeded\n");
385 static void kauditd_send_skb(struct sk_buff
*skb
)
388 /* take a reference in case we can't send it and we want to hold it */
390 err
= netlink_unicast(audit_sock
, skb
, audit_nlk_portid
, 0);
392 BUG_ON(err
!= -ECONNREFUSED
); /* Shouldn't happen */
393 printk(KERN_ERR
"audit: *NO* daemon at audit_pid=%d\n", audit_pid
);
394 audit_log_lost("auditd disappeared\n");
396 /* we might get lucky and get this in the next auditd */
399 /* drop the extra reference if sent ok */
404 * flush_hold_queue - empty the hold queue if auditd appears
406 * If auditd just started, drain the queue of messages already
407 * sent to syslog/printk. Remember loss here is ok. We already
408 * called audit_log_lost() if it didn't go out normally. so the
409 * race between the skb_dequeue and the next check for audit_pid
412 * If you ever find kauditd to be too slow we can get a perf win
413 * by doing our own locking and keeping better track if there
414 * are messages in this queue. I don't see the need now, but
415 * in 5 years when I want to play with this again I'll see this
416 * note and still have no friggin idea what i'm thinking today.
418 static void flush_hold_queue(void)
422 if (!audit_default
|| !audit_pid
)
425 skb
= skb_dequeue(&audit_skb_hold_queue
);
429 while (skb
&& audit_pid
) {
430 kauditd_send_skb(skb
);
431 skb
= skb_dequeue(&audit_skb_hold_queue
);
435 * if auditd just disappeared but we
436 * dequeued an skb we need to drop ref
442 static int kauditd_thread(void *dummy
)
445 while (!kthread_should_stop()) {
447 DECLARE_WAITQUEUE(wait
, current
);
451 skb
= skb_dequeue(&audit_skb_queue
);
452 wake_up(&audit_backlog_wait
);
455 kauditd_send_skb(skb
);
457 audit_printk_skb(skb
);
460 set_current_state(TASK_INTERRUPTIBLE
);
461 add_wait_queue(&kauditd_wait
, &wait
);
463 if (!skb_queue_len(&audit_skb_queue
)) {
468 __set_current_state(TASK_RUNNING
);
469 remove_wait_queue(&kauditd_wait
, &wait
);
474 int audit_send_list(void *_dest
)
476 struct audit_netlink_list
*dest
= _dest
;
480 /* wait for parent to finish and send an ACK */
481 mutex_lock(&audit_cmd_mutex
);
482 mutex_unlock(&audit_cmd_mutex
);
484 while ((skb
= __skb_dequeue(&dest
->q
)) != NULL
)
485 netlink_unicast(audit_sock
, skb
, pid
, 0);
492 struct sk_buff
*audit_make_reply(int pid
, int seq
, int type
, int done
,
493 int multi
, const void *payload
, int size
)
496 struct nlmsghdr
*nlh
;
498 int flags
= multi
? NLM_F_MULTI
: 0;
499 int t
= done
? NLMSG_DONE
: type
;
501 skb
= nlmsg_new(size
, GFP_KERNEL
);
505 nlh
= nlmsg_put(skb
, pid
, seq
, t
, size
, flags
);
508 data
= nlmsg_data(nlh
);
509 memcpy(data
, payload
, size
);
517 static int audit_send_reply_thread(void *arg
)
519 struct audit_reply
*reply
= (struct audit_reply
*)arg
;
521 mutex_lock(&audit_cmd_mutex
);
522 mutex_unlock(&audit_cmd_mutex
);
524 /* Ignore failure. It'll only happen if the sender goes away,
525 because our timeout is set to infinite. */
526 netlink_unicast(audit_sock
, reply
->skb
, reply
->pid
, 0);
531 * audit_send_reply - send an audit reply message via netlink
532 * @pid: process id to send reply to
533 * @seq: sequence number
534 * @type: audit message type
535 * @done: done (last) flag
536 * @multi: multi-part message flag
537 * @payload: payload data
538 * @size: payload size
540 * Allocates an skb, builds the netlink message, and sends it to the pid.
541 * No failure notifications.
543 static void audit_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
544 const void *payload
, int size
)
547 struct task_struct
*tsk
;
548 struct audit_reply
*reply
= kmalloc(sizeof(struct audit_reply
),
554 skb
= audit_make_reply(pid
, seq
, type
, done
, multi
, payload
, size
);
561 tsk
= kthread_run(audit_send_reply_thread
, reply
, "audit_send_reply");
570 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
573 static int audit_netlink_ok(struct sk_buff
*skb
, u16 msg_type
)
577 /* Only support the initial namespaces for now. */
578 if ((current_user_ns() != &init_user_ns
) ||
579 (task_active_pid_ns(current
) != &init_pid_ns
))
589 case AUDIT_LIST_RULES
:
592 case AUDIT_SIGNAL_INFO
:
596 case AUDIT_MAKE_EQUIV
:
597 if (!netlink_capable(skb
, CAP_AUDIT_CONTROL
))
601 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
602 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
603 if (!netlink_capable(skb
, CAP_AUDIT_WRITE
))
606 default: /* bad msg */
613 static int audit_log_common_recv_msg(struct audit_buffer
**ab
, u16 msg_type
)
616 uid_t uid
= from_kuid(&init_user_ns
, current_uid());
618 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
) {
623 *ab
= audit_log_start(NULL
, GFP_KERNEL
, msg_type
);
626 audit_log_format(*ab
, "pid=%d uid=%u", task_tgid_vnr(current
), uid
);
627 audit_log_session_info(*ab
);
628 audit_log_task_context(*ab
);
633 static int audit_receive_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
637 struct audit_status
*status_get
, status_set
;
639 struct audit_buffer
*ab
;
640 u16 msg_type
= nlh
->nlmsg_type
;
641 struct audit_sig_info
*sig_data
;
645 err
= audit_netlink_ok(skb
, msg_type
);
649 /* As soon as there's any sign of userspace auditd,
650 * start kauditd to talk to it */
652 kauditd_task
= kthread_run(kauditd_thread
, NULL
, "kauditd");
653 if (IS_ERR(kauditd_task
)) {
654 err
= PTR_ERR(kauditd_task
);
659 seq
= nlh
->nlmsg_seq
;
660 data
= nlmsg_data(nlh
);
665 status_set
.enabled
= audit_enabled
;
666 status_set
.failure
= audit_failure
;
667 status_set
.pid
= audit_pid
;
668 status_set
.rate_limit
= audit_rate_limit
;
669 status_set
.backlog_limit
= audit_backlog_limit
;
670 status_set
.lost
= atomic_read(&audit_lost
);
671 status_set
.backlog
= skb_queue_len(&audit_skb_queue
);
672 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_GET
, 0, 0,
673 &status_set
, sizeof(status_set
));
676 if (nlmsg_len(nlh
) < sizeof(struct audit_status
))
678 status_get
= (struct audit_status
*)data
;
679 if (status_get
->mask
& AUDIT_STATUS_ENABLED
) {
680 err
= audit_set_enabled(status_get
->enabled
);
684 if (status_get
->mask
& AUDIT_STATUS_FAILURE
) {
685 err
= audit_set_failure(status_get
->failure
);
689 if (status_get
->mask
& AUDIT_STATUS_PID
) {
690 int new_pid
= status_get
->pid
;
692 if (audit_enabled
!= AUDIT_OFF
)
693 audit_log_config_change("audit_pid", new_pid
, audit_pid
, 1);
695 audit_nlk_portid
= NETLINK_CB(skb
).portid
;
697 if (status_get
->mask
& AUDIT_STATUS_RATE_LIMIT
) {
698 err
= audit_set_rate_limit(status_get
->rate_limit
);
702 if (status_get
->mask
& AUDIT_STATUS_BACKLOG_LIMIT
)
703 err
= audit_set_backlog_limit(status_get
->backlog_limit
);
706 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
707 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
708 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
)
711 err
= audit_filter_user(msg_type
);
714 if (msg_type
== AUDIT_USER_TTY
) {
715 err
= tty_audit_push_current();
719 audit_log_common_recv_msg(&ab
, msg_type
);
720 if (msg_type
!= AUDIT_USER_TTY
)
721 audit_log_format(ab
, " msg='%.1024s'",
726 audit_log_format(ab
, " data=");
727 size
= nlmsg_len(nlh
);
729 ((unsigned char *)data
)[size
- 1] == '\0')
731 audit_log_n_untrustedstring(ab
, data
, size
);
733 audit_set_pid(ab
, NETLINK_CB(skb
).portid
);
739 if (nlmsg_len(nlh
) < sizeof(struct audit_rule_data
))
741 if (audit_enabled
== AUDIT_LOCKED
) {
742 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
743 audit_log_format(ab
, " audit_enabled=%d res=0", audit_enabled
);
748 case AUDIT_LIST_RULES
:
749 err
= audit_receive_filter(msg_type
, NETLINK_CB(skb
).portid
,
750 seq
, data
, nlmsg_len(nlh
));
754 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
755 audit_log_format(ab
, " op=trim res=1");
758 case AUDIT_MAKE_EQUIV
: {
761 size_t msglen
= nlmsg_len(nlh
);
765 if (msglen
< 2 * sizeof(u32
))
767 memcpy(sizes
, bufp
, 2 * sizeof(u32
));
768 bufp
+= 2 * sizeof(u32
);
769 msglen
-= 2 * sizeof(u32
);
770 old
= audit_unpack_string(&bufp
, &msglen
, sizes
[0]);
775 new = audit_unpack_string(&bufp
, &msglen
, sizes
[1]);
781 /* OK, here comes... */
782 err
= audit_tag_tree(old
, new);
784 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
786 audit_log_format(ab
, " op=make_equiv old=");
787 audit_log_untrustedstring(ab
, old
);
788 audit_log_format(ab
, " new=");
789 audit_log_untrustedstring(ab
, new);
790 audit_log_format(ab
, " res=%d", !err
);
796 case AUDIT_SIGNAL_INFO
:
799 err
= security_secid_to_secctx(audit_sig_sid
, &ctx
, &len
);
803 sig_data
= kmalloc(sizeof(*sig_data
) + len
, GFP_KERNEL
);
806 security_release_secctx(ctx
, len
);
809 sig_data
->uid
= from_kuid(&init_user_ns
, audit_sig_uid
);
810 sig_data
->pid
= audit_sig_pid
;
812 memcpy(sig_data
->ctx
, ctx
, len
);
813 security_release_secctx(ctx
, len
);
815 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_SIGNAL_INFO
,
816 0, 0, sig_data
, sizeof(*sig_data
) + len
);
819 case AUDIT_TTY_GET
: {
820 struct audit_tty_status s
;
821 struct task_struct
*tsk
= current
;
823 spin_lock(&tsk
->sighand
->siglock
);
824 s
.enabled
= tsk
->signal
->audit_tty
!= 0;
825 s
.log_passwd
= tsk
->signal
->audit_tty_log_passwd
;
826 spin_unlock(&tsk
->sighand
->siglock
);
828 audit_send_reply(NETLINK_CB(skb
).portid
, seq
,
829 AUDIT_TTY_GET
, 0, 0, &s
, sizeof(s
));
832 case AUDIT_TTY_SET
: {
833 struct audit_tty_status s
;
834 struct task_struct
*tsk
= current
;
836 memset(&s
, 0, sizeof(s
));
837 /* guard against past and future API changes */
838 memcpy(&s
, data
, min_t(size_t, sizeof(s
), nlmsg_len(nlh
)));
839 if ((s
.enabled
!= 0 && s
.enabled
!= 1) ||
840 (s
.log_passwd
!= 0 && s
.log_passwd
!= 1))
843 spin_lock(&tsk
->sighand
->siglock
);
844 tsk
->signal
->audit_tty
= s
.enabled
;
845 tsk
->signal
->audit_tty_log_passwd
= s
.log_passwd
;
846 spin_unlock(&tsk
->sighand
->siglock
);
854 return err
< 0 ? err
: 0;
858 * Get message from skb. Each message is processed by audit_receive_msg.
859 * Malformed skbs with wrong length are discarded silently.
861 static void audit_receive_skb(struct sk_buff
*skb
)
863 struct nlmsghdr
*nlh
;
865 * len MUST be signed for nlmsg_next to be able to dec it below 0
866 * if the nlmsg_len was not aligned
871 nlh
= nlmsg_hdr(skb
);
874 while (nlmsg_ok(nlh
, len
)) {
875 err
= audit_receive_msg(skb
, nlh
);
876 /* if err or if this message says it wants a response */
877 if (err
|| (nlh
->nlmsg_flags
& NLM_F_ACK
))
878 netlink_ack(skb
, nlh
, err
);
880 nlh
= nlmsg_next(nlh
, &len
);
884 /* Receive messages from netlink socket. */
885 static void audit_receive(struct sk_buff
*skb
)
887 mutex_lock(&audit_cmd_mutex
);
888 audit_receive_skb(skb
);
889 mutex_unlock(&audit_cmd_mutex
);
892 /* Initialize audit support at boot time. */
893 static int __init
audit_init(void)
896 struct netlink_kernel_cfg cfg
= {
897 .input
= audit_receive
,
900 if (audit_initialized
== AUDIT_DISABLED
)
903 printk(KERN_INFO
"audit: initializing netlink socket (%s)\n",
904 audit_default
? "enabled" : "disabled");
905 audit_sock
= netlink_kernel_create(&init_net
, NETLINK_AUDIT
, &cfg
);
907 audit_panic("cannot initialize netlink socket");
909 audit_sock
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
911 skb_queue_head_init(&audit_skb_queue
);
912 skb_queue_head_init(&audit_skb_hold_queue
);
913 audit_initialized
= AUDIT_INITIALIZED
;
914 audit_enabled
= audit_default
;
915 audit_ever_enabled
|= !!audit_default
;
917 audit_log(NULL
, GFP_KERNEL
, AUDIT_KERNEL
, "initialized");
919 for (i
= 0; i
< AUDIT_INODE_BUCKETS
; i
++)
920 INIT_LIST_HEAD(&audit_inode_hash
[i
]);
924 __initcall(audit_init
);
926 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
927 static int __init
audit_enable(char *str
)
929 audit_default
= !!simple_strtol(str
, NULL
, 0);
931 audit_initialized
= AUDIT_DISABLED
;
933 printk(KERN_INFO
"audit: %s", audit_default
? "enabled" : "disabled");
935 if (audit_initialized
== AUDIT_INITIALIZED
) {
936 audit_enabled
= audit_default
;
937 audit_ever_enabled
|= !!audit_default
;
938 } else if (audit_initialized
== AUDIT_UNINITIALIZED
) {
939 printk(" (after initialization)");
941 printk(" (until reboot)");
948 __setup("audit=", audit_enable
);
950 static void audit_buffer_free(struct audit_buffer
*ab
)
960 spin_lock_irqsave(&audit_freelist_lock
, flags
);
961 if (audit_freelist_count
> AUDIT_MAXFREE
)
964 audit_freelist_count
++;
965 list_add(&ab
->list
, &audit_freelist
);
967 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
970 static struct audit_buffer
* audit_buffer_alloc(struct audit_context
*ctx
,
971 gfp_t gfp_mask
, int type
)
974 struct audit_buffer
*ab
= NULL
;
975 struct nlmsghdr
*nlh
;
977 spin_lock_irqsave(&audit_freelist_lock
, flags
);
978 if (!list_empty(&audit_freelist
)) {
979 ab
= list_entry(audit_freelist
.next
,
980 struct audit_buffer
, list
);
982 --audit_freelist_count
;
984 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
987 ab
= kmalloc(sizeof(*ab
), gfp_mask
);
993 ab
->gfp_mask
= gfp_mask
;
995 ab
->skb
= nlmsg_new(AUDIT_BUFSIZ
, gfp_mask
);
999 nlh
= nlmsg_put(ab
->skb
, 0, 0, type
, 0, 0);
1009 audit_buffer_free(ab
);
1014 * audit_serial - compute a serial number for the audit record
1016 * Compute a serial number for the audit record. Audit records are
1017 * written to user-space as soon as they are generated, so a complete
1018 * audit record may be written in several pieces. The timestamp of the
1019 * record and this serial number are used by the user-space tools to
1020 * determine which pieces belong to the same audit record. The
1021 * (timestamp,serial) tuple is unique for each syscall and is live from
1022 * syscall entry to syscall exit.
1024 * NOTE: Another possibility is to store the formatted records off the
1025 * audit context (for those records that have a context), and emit them
1026 * all at syscall exit. However, this could delay the reporting of
1027 * significant errors until syscall exit (or never, if the system
1030 unsigned int audit_serial(void)
1032 static DEFINE_SPINLOCK(serial_lock
);
1033 static unsigned int serial
= 0;
1035 unsigned long flags
;
1038 spin_lock_irqsave(&serial_lock
, flags
);
1041 } while (unlikely(!ret
));
1042 spin_unlock_irqrestore(&serial_lock
, flags
);
1047 static inline void audit_get_stamp(struct audit_context
*ctx
,
1048 struct timespec
*t
, unsigned int *serial
)
1050 if (!ctx
|| !auditsc_get_stamp(ctx
, t
, serial
)) {
1052 *serial
= audit_serial();
1057 * Wait for auditd to drain the queue a little
1059 static void wait_for_auditd(unsigned long sleep_time
)
1061 DECLARE_WAITQUEUE(wait
, current
);
1062 set_current_state(TASK_UNINTERRUPTIBLE
);
1063 add_wait_queue(&audit_backlog_wait
, &wait
);
1065 if (audit_backlog_limit
&&
1066 skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
)
1067 schedule_timeout(sleep_time
);
1069 __set_current_state(TASK_RUNNING
);
1070 remove_wait_queue(&audit_backlog_wait
, &wait
);
1073 /* Obtain an audit buffer. This routine does locking to obtain the
1074 * audit buffer, but then no locking is required for calls to
1075 * audit_log_*format. If the tsk is a task that is currently in a
1076 * syscall, then the syscall is marked as auditable and an audit record
1077 * will be written at syscall exit. If there is no associated task, tsk
1078 * should be NULL. */
1081 * audit_log_start - obtain an audit buffer
1082 * @ctx: audit_context (may be NULL)
1083 * @gfp_mask: type of allocation
1084 * @type: audit message type
1086 * Returns audit_buffer pointer on success or NULL on error.
1088 * Obtain an audit buffer. This routine does locking to obtain the
1089 * audit buffer, but then no locking is required for calls to
1090 * audit_log_*format. If the task (ctx) is a task that is currently in a
1091 * syscall, then the syscall is marked as auditable and an audit record
1092 * will be written at syscall exit. If there is no associated task, then
1093 * task context (ctx) should be NULL.
1095 struct audit_buffer
*audit_log_start(struct audit_context
*ctx
, gfp_t gfp_mask
,
1098 struct audit_buffer
*ab
= NULL
;
1100 unsigned int uninitialized_var(serial
);
1102 unsigned long timeout_start
= jiffies
;
1104 if (audit_initialized
!= AUDIT_INITIALIZED
)
1107 if (unlikely(audit_filter_type(type
)))
1110 if (gfp_mask
& __GFP_WAIT
)
1113 reserve
= 5; /* Allow atomic callers to go up to five
1114 entries over the normal backlog limit */
1116 while (audit_backlog_limit
1117 && skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
+ reserve
) {
1118 if (gfp_mask
& __GFP_WAIT
&& audit_backlog_wait_time
) {
1119 unsigned long sleep_time
;
1121 sleep_time
= timeout_start
+ audit_backlog_wait_time
-
1123 if ((long)sleep_time
> 0) {
1124 wait_for_auditd(sleep_time
);
1128 if (audit_rate_check() && printk_ratelimit())
1130 "audit: audit_backlog=%d > "
1131 "audit_backlog_limit=%d\n",
1132 skb_queue_len(&audit_skb_queue
),
1133 audit_backlog_limit
);
1134 audit_log_lost("backlog limit exceeded");
1135 audit_backlog_wait_time
= audit_backlog_wait_overflow
;
1136 wake_up(&audit_backlog_wait
);
1140 audit_backlog_wait_time
= AUDIT_BACKLOG_WAIT_TIME
;
1142 ab
= audit_buffer_alloc(ctx
, gfp_mask
, type
);
1144 audit_log_lost("out of memory in audit_log_start");
1148 audit_get_stamp(ab
->ctx
, &t
, &serial
);
1150 audit_log_format(ab
, "audit(%lu.%03lu:%u): ",
1151 t
.tv_sec
, t
.tv_nsec
/1000000, serial
);
1156 * audit_expand - expand skb in the audit buffer
1158 * @extra: space to add at tail of the skb
1160 * Returns 0 (no space) on failed expansion, or available space if
1163 static inline int audit_expand(struct audit_buffer
*ab
, int extra
)
1165 struct sk_buff
*skb
= ab
->skb
;
1166 int oldtail
= skb_tailroom(skb
);
1167 int ret
= pskb_expand_head(skb
, 0, extra
, ab
->gfp_mask
);
1168 int newtail
= skb_tailroom(skb
);
1171 audit_log_lost("out of memory in audit_expand");
1175 skb
->truesize
+= newtail
- oldtail
;
1180 * Format an audit message into the audit buffer. If there isn't enough
1181 * room in the audit buffer, more room will be allocated and vsnprint
1182 * will be called a second time. Currently, we assume that a printk
1183 * can't format message larger than 1024 bytes, so we don't either.
1185 static void audit_log_vformat(struct audit_buffer
*ab
, const char *fmt
,
1189 struct sk_buff
*skb
;
1197 avail
= skb_tailroom(skb
);
1199 avail
= audit_expand(ab
, AUDIT_BUFSIZ
);
1203 va_copy(args2
, args
);
1204 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args
);
1206 /* The printk buffer is 1024 bytes long, so if we get
1207 * here and AUDIT_BUFSIZ is at least 1024, then we can
1208 * log everything that printk could have logged. */
1209 avail
= audit_expand(ab
,
1210 max_t(unsigned, AUDIT_BUFSIZ
, 1+len
-avail
));
1213 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args2
);
1224 * audit_log_format - format a message into the audit buffer.
1226 * @fmt: format string
1227 * @...: optional parameters matching @fmt string
1229 * All the work is done in audit_log_vformat.
1231 void audit_log_format(struct audit_buffer
*ab
, const char *fmt
, ...)
1237 va_start(args
, fmt
);
1238 audit_log_vformat(ab
, fmt
, args
);
1243 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1244 * @ab: the audit_buffer
1245 * @buf: buffer to convert to hex
1246 * @len: length of @buf to be converted
1248 * No return value; failure to expand is silently ignored.
1250 * This function will take the passed buf and convert it into a string of
1251 * ascii hex digits. The new string is placed onto the skb.
1253 void audit_log_n_hex(struct audit_buffer
*ab
, const unsigned char *buf
,
1256 int i
, avail
, new_len
;
1258 struct sk_buff
*skb
;
1259 static const unsigned char *hex
= "0123456789ABCDEF";
1266 avail
= skb_tailroom(skb
);
1268 if (new_len
>= avail
) {
1269 /* Round the buffer request up to the next multiple */
1270 new_len
= AUDIT_BUFSIZ
*(((new_len
-avail
)/AUDIT_BUFSIZ
) + 1);
1271 avail
= audit_expand(ab
, new_len
);
1276 ptr
= skb_tail_pointer(skb
);
1277 for (i
=0; i
<len
; i
++) {
1278 *ptr
++ = hex
[(buf
[i
] & 0xF0)>>4]; /* Upper nibble */
1279 *ptr
++ = hex
[buf
[i
] & 0x0F]; /* Lower nibble */
1282 skb_put(skb
, len
<< 1); /* new string is twice the old string */
1286 * Format a string of no more than slen characters into the audit buffer,
1287 * enclosed in quote marks.
1289 void audit_log_n_string(struct audit_buffer
*ab
, const char *string
,
1294 struct sk_buff
*skb
;
1301 avail
= skb_tailroom(skb
);
1302 new_len
= slen
+ 3; /* enclosing quotes + null terminator */
1303 if (new_len
> avail
) {
1304 avail
= audit_expand(ab
, new_len
);
1308 ptr
= skb_tail_pointer(skb
);
1310 memcpy(ptr
, string
, slen
);
1314 skb_put(skb
, slen
+ 2); /* don't include null terminator */
1318 * audit_string_contains_control - does a string need to be logged in hex
1319 * @string: string to be checked
1320 * @len: max length of the string to check
1322 int audit_string_contains_control(const char *string
, size_t len
)
1324 const unsigned char *p
;
1325 for (p
= string
; p
< (const unsigned char *)string
+ len
; p
++) {
1326 if (*p
== '"' || *p
< 0x21 || *p
> 0x7e)
1333 * audit_log_n_untrustedstring - log a string that may contain random characters
1335 * @len: length of string (not including trailing null)
1336 * @string: string to be logged
1338 * This code will escape a string that is passed to it if the string
1339 * contains a control character, unprintable character, double quote mark,
1340 * or a space. Unescaped strings will start and end with a double quote mark.
1341 * Strings that are escaped are printed in hex (2 digits per char).
1343 * The caller specifies the number of characters in the string to log, which may
1344 * or may not be the entire string.
1346 void audit_log_n_untrustedstring(struct audit_buffer
*ab
, const char *string
,
1349 if (audit_string_contains_control(string
, len
))
1350 audit_log_n_hex(ab
, string
, len
);
1352 audit_log_n_string(ab
, string
, len
);
1356 * audit_log_untrustedstring - log a string that may contain random characters
1358 * @string: string to be logged
1360 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1361 * determine string length.
1363 void audit_log_untrustedstring(struct audit_buffer
*ab
, const char *string
)
1365 audit_log_n_untrustedstring(ab
, string
, strlen(string
));
1368 /* This is a helper-function to print the escaped d_path */
1369 void audit_log_d_path(struct audit_buffer
*ab
, const char *prefix
,
1370 const struct path
*path
)
1375 audit_log_format(ab
, "%s", prefix
);
1377 /* We will allow 11 spaces for ' (deleted)' to be appended */
1378 pathname
= kmalloc(PATH_MAX
+11, ab
->gfp_mask
);
1380 audit_log_string(ab
, "<no_memory>");
1383 p
= d_path(path
, pathname
, PATH_MAX
+11);
1384 if (IS_ERR(p
)) { /* Should never happen since we send PATH_MAX */
1385 /* FIXME: can we save some information here? */
1386 audit_log_string(ab
, "<too_long>");
1388 audit_log_untrustedstring(ab
, p
);
1392 void audit_log_session_info(struct audit_buffer
*ab
)
1394 u32 sessionid
= audit_get_sessionid(current
);
1395 uid_t auid
= from_kuid(&init_user_ns
, audit_get_loginuid(current
));
1397 audit_log_format(ab
, " auid=%u ses=%u\n", auid
, sessionid
);
1400 void audit_log_key(struct audit_buffer
*ab
, char *key
)
1402 audit_log_format(ab
, " key=");
1404 audit_log_untrustedstring(ab
, key
);
1406 audit_log_format(ab
, "(null)");
1409 void audit_log_cap(struct audit_buffer
*ab
, char *prefix
, kernel_cap_t
*cap
)
1413 audit_log_format(ab
, " %s=", prefix
);
1414 CAP_FOR_EACH_U32(i
) {
1415 audit_log_format(ab
, "%08x",
1416 cap
->cap
[CAP_LAST_U32
- i
]);
1420 void audit_log_fcaps(struct audit_buffer
*ab
, struct audit_names
*name
)
1422 kernel_cap_t
*perm
= &name
->fcap
.permitted
;
1423 kernel_cap_t
*inh
= &name
->fcap
.inheritable
;
1426 if (!cap_isclear(*perm
)) {
1427 audit_log_cap(ab
, "cap_fp", perm
);
1430 if (!cap_isclear(*inh
)) {
1431 audit_log_cap(ab
, "cap_fi", inh
);
1436 audit_log_format(ab
, " cap_fe=%d cap_fver=%x",
1437 name
->fcap
.fE
, name
->fcap_ver
);
1440 static inline int audit_copy_fcaps(struct audit_names
*name
,
1441 const struct dentry
*dentry
)
1443 struct cpu_vfs_cap_data caps
;
1449 rc
= get_vfs_caps_from_disk(dentry
, &caps
);
1453 name
->fcap
.permitted
= caps
.permitted
;
1454 name
->fcap
.inheritable
= caps
.inheritable
;
1455 name
->fcap
.fE
= !!(caps
.magic_etc
& VFS_CAP_FLAGS_EFFECTIVE
);
1456 name
->fcap_ver
= (caps
.magic_etc
& VFS_CAP_REVISION_MASK
) >>
1457 VFS_CAP_REVISION_SHIFT
;
1462 /* Copy inode data into an audit_names. */
1463 void audit_copy_inode(struct audit_names
*name
, const struct dentry
*dentry
,
1464 const struct inode
*inode
)
1466 name
->ino
= inode
->i_ino
;
1467 name
->dev
= inode
->i_sb
->s_dev
;
1468 name
->mode
= inode
->i_mode
;
1469 name
->uid
= inode
->i_uid
;
1470 name
->gid
= inode
->i_gid
;
1471 name
->rdev
= inode
->i_rdev
;
1472 security_inode_getsecid(inode
, &name
->osid
);
1473 audit_copy_fcaps(name
, dentry
);
1477 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1478 * @context: audit_context for the task
1479 * @n: audit_names structure with reportable details
1480 * @path: optional path to report instead of audit_names->name
1481 * @record_num: record number to report when handling a list of names
1482 * @call_panic: optional pointer to int that will be updated if secid fails
1484 void audit_log_name(struct audit_context
*context
, struct audit_names
*n
,
1485 struct path
*path
, int record_num
, int *call_panic
)
1487 struct audit_buffer
*ab
;
1488 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_PATH
);
1492 audit_log_format(ab
, "item=%d", record_num
);
1495 audit_log_d_path(ab
, " name=", path
);
1497 switch (n
->name_len
) {
1498 case AUDIT_NAME_FULL
:
1499 /* log the full path */
1500 audit_log_format(ab
, " name=");
1501 audit_log_untrustedstring(ab
, n
->name
->name
);
1504 /* name was specified as a relative path and the
1505 * directory component is the cwd */
1506 audit_log_d_path(ab
, " name=", &context
->pwd
);
1509 /* log the name's directory component */
1510 audit_log_format(ab
, " name=");
1511 audit_log_n_untrustedstring(ab
, n
->name
->name
,
1515 audit_log_format(ab
, " name=(null)");
1517 if (n
->ino
!= (unsigned long)-1) {
1518 audit_log_format(ab
, " inode=%lu"
1519 " dev=%02x:%02x mode=%#ho"
1520 " ouid=%u ogid=%u rdev=%02x:%02x",
1525 from_kuid(&init_user_ns
, n
->uid
),
1526 from_kgid(&init_user_ns
, n
->gid
),
1533 if (security_secid_to_secctx(
1534 n
->osid
, &ctx
, &len
)) {
1535 audit_log_format(ab
, " osid=%u", n
->osid
);
1539 audit_log_format(ab
, " obj=%s", ctx
);
1540 security_release_secctx(ctx
, len
);
1544 /* log the audit_names record type */
1545 audit_log_format(ab
, " nametype=");
1547 case AUDIT_TYPE_NORMAL
:
1548 audit_log_format(ab
, "NORMAL");
1550 case AUDIT_TYPE_PARENT
:
1551 audit_log_format(ab
, "PARENT");
1553 case AUDIT_TYPE_CHILD_DELETE
:
1554 audit_log_format(ab
, "DELETE");
1556 case AUDIT_TYPE_CHILD_CREATE
:
1557 audit_log_format(ab
, "CREATE");
1560 audit_log_format(ab
, "UNKNOWN");
1564 audit_log_fcaps(ab
, n
);
1568 int audit_log_task_context(struct audit_buffer
*ab
)
1575 security_task_getsecid(current
, &sid
);
1579 error
= security_secid_to_secctx(sid
, &ctx
, &len
);
1581 if (error
!= -EINVAL
)
1586 audit_log_format(ab
, " subj=%s", ctx
);
1587 security_release_secctx(ctx
, len
);
1591 audit_panic("error in audit_log_task_context");
1594 EXPORT_SYMBOL(audit_log_task_context
);
1596 void audit_log_task_info(struct audit_buffer
*ab
, struct task_struct
*tsk
)
1598 const struct cred
*cred
;
1599 char name
[sizeof(tsk
->comm
)];
1600 struct mm_struct
*mm
= tsk
->mm
;
1606 /* tsk == current */
1607 cred
= current_cred();
1609 spin_lock_irq(&tsk
->sighand
->siglock
);
1610 if (tsk
->signal
&& tsk
->signal
->tty
&& tsk
->signal
->tty
->name
)
1611 tty
= tsk
->signal
->tty
->name
;
1614 spin_unlock_irq(&tsk
->sighand
->siglock
);
1616 audit_log_format(ab
,
1617 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1618 " euid=%u suid=%u fsuid=%u"
1619 " egid=%u sgid=%u fsgid=%u ses=%u tty=%s",
1622 from_kuid(&init_user_ns
, audit_get_loginuid(tsk
)),
1623 from_kuid(&init_user_ns
, cred
->uid
),
1624 from_kgid(&init_user_ns
, cred
->gid
),
1625 from_kuid(&init_user_ns
, cred
->euid
),
1626 from_kuid(&init_user_ns
, cred
->suid
),
1627 from_kuid(&init_user_ns
, cred
->fsuid
),
1628 from_kgid(&init_user_ns
, cred
->egid
),
1629 from_kgid(&init_user_ns
, cred
->sgid
),
1630 from_kgid(&init_user_ns
, cred
->fsgid
),
1631 audit_get_sessionid(tsk
), tty
);
1633 get_task_comm(name
, tsk
);
1634 audit_log_format(ab
, " comm=");
1635 audit_log_untrustedstring(ab
, name
);
1638 down_read(&mm
->mmap_sem
);
1640 audit_log_d_path(ab
, " exe=", &mm
->exe_file
->f_path
);
1641 up_read(&mm
->mmap_sem
);
1643 audit_log_task_context(ab
);
1645 EXPORT_SYMBOL(audit_log_task_info
);
1648 * audit_log_link_denied - report a link restriction denial
1649 * @operation: specific link opreation
1650 * @link: the path that triggered the restriction
1652 void audit_log_link_denied(const char *operation
, struct path
*link
)
1654 struct audit_buffer
*ab
;
1655 struct audit_names
*name
;
1657 name
= kzalloc(sizeof(*name
), GFP_NOFS
);
1661 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1662 ab
= audit_log_start(current
->audit_context
, GFP_KERNEL
,
1666 audit_log_format(ab
, "op=%s", operation
);
1667 audit_log_task_info(ab
, current
);
1668 audit_log_format(ab
, " res=0");
1671 /* Generate AUDIT_PATH record with object. */
1672 name
->type
= AUDIT_TYPE_NORMAL
;
1673 audit_copy_inode(name
, link
->dentry
, link
->dentry
->d_inode
);
1674 audit_log_name(current
->audit_context
, name
, link
, 0, NULL
);
1680 * audit_log_end - end one audit record
1681 * @ab: the audit_buffer
1683 * The netlink_* functions cannot be called inside an irq context, so
1684 * the audit buffer is placed on a queue and a tasklet is scheduled to
1685 * remove them from the queue outside the irq context. May be called in
1688 void audit_log_end(struct audit_buffer
*ab
)
1692 if (!audit_rate_check()) {
1693 audit_log_lost("rate limit exceeded");
1695 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
1696 nlh
->nlmsg_len
= ab
->skb
->len
- NLMSG_HDRLEN
;
1699 skb_queue_tail(&audit_skb_queue
, ab
->skb
);
1700 wake_up_interruptible(&kauditd_wait
);
1702 audit_printk_skb(ab
->skb
);
1706 audit_buffer_free(ab
);
1710 * audit_log - Log an audit record
1711 * @ctx: audit context
1712 * @gfp_mask: type of allocation
1713 * @type: audit message type
1714 * @fmt: format string to use
1715 * @...: variable parameters matching the format string
1717 * This is a convenience function that calls audit_log_start,
1718 * audit_log_vformat, and audit_log_end. It may be called
1721 void audit_log(struct audit_context
*ctx
, gfp_t gfp_mask
, int type
,
1722 const char *fmt
, ...)
1724 struct audit_buffer
*ab
;
1727 ab
= audit_log_start(ctx
, gfp_mask
, type
);
1729 va_start(args
, fmt
);
1730 audit_log_vformat(ab
, fmt
, args
);
1736 #ifdef CONFIG_SECURITY
1738 * audit_log_secctx - Converts and logs SELinux context
1740 * @secid: security number
1742 * This is a helper function that calls security_secid_to_secctx to convert
1743 * secid to secctx and then adds the (converted) SELinux context to the audit
1744 * log by calling audit_log_format, thus also preventing leak of internal secid
1745 * to userspace. If secid cannot be converted audit_panic is called.
1747 void audit_log_secctx(struct audit_buffer
*ab
, u32 secid
)
1752 if (security_secid_to_secctx(secid
, &secctx
, &len
)) {
1753 audit_panic("Cannot convert secid to context");
1755 audit_log_format(ab
, " obj=%s", secctx
);
1756 security_release_secctx(secctx
, len
);
1759 EXPORT_SYMBOL(audit_log_secctx
);
1762 EXPORT_SYMBOL(audit_log_start
);
1763 EXPORT_SYMBOL(audit_log_end
);
1764 EXPORT_SYMBOL(audit_log_format
);
1765 EXPORT_SYMBOL(audit_log
);