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
);
1230 if (audit_rate_check() && printk_ratelimit())
1232 "audit: audit_backlog=%d > "
1233 "audit_backlog_limit=%d\n",
1234 skb_queue_len(&audit_skb_queue
),
1235 audit_backlog_limit
);
1236 audit_log_lost("backlog limit exceeded");
1237 audit_backlog_wait_time
= audit_backlog_wait_overflow
;
1238 wake_up(&audit_backlog_wait
);
1242 ab
= audit_buffer_alloc(ctx
, gfp_mask
, type
);
1244 audit_log_lost("out of memory in audit_log_start");
1248 audit_get_stamp(ab
->ctx
, &t
, &serial
);
1250 audit_log_format(ab
, "audit(%lu.%03lu:%u): ",
1251 t
.tv_sec
, t
.tv_nsec
/1000000, serial
);
1256 * audit_expand - expand skb in the audit buffer
1258 * @extra: space to add at tail of the skb
1260 * Returns 0 (no space) on failed expansion, or available space if
1263 static inline int audit_expand(struct audit_buffer
*ab
, int extra
)
1265 struct sk_buff
*skb
= ab
->skb
;
1266 int oldtail
= skb_tailroom(skb
);
1267 int ret
= pskb_expand_head(skb
, 0, extra
, ab
->gfp_mask
);
1268 int newtail
= skb_tailroom(skb
);
1271 audit_log_lost("out of memory in audit_expand");
1275 skb
->truesize
+= newtail
- oldtail
;
1280 * Format an audit message into the audit buffer. If there isn't enough
1281 * room in the audit buffer, more room will be allocated and vsnprint
1282 * will be called a second time. Currently, we assume that a printk
1283 * can't format message larger than 1024 bytes, so we don't either.
1285 static void audit_log_vformat(struct audit_buffer
*ab
, const char *fmt
,
1289 struct sk_buff
*skb
;
1297 avail
= skb_tailroom(skb
);
1299 avail
= audit_expand(ab
, AUDIT_BUFSIZ
);
1303 va_copy(args2
, args
);
1304 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args
);
1306 /* The printk buffer is 1024 bytes long, so if we get
1307 * here and AUDIT_BUFSIZ is at least 1024, then we can
1308 * log everything that printk could have logged. */
1309 avail
= audit_expand(ab
,
1310 max_t(unsigned, AUDIT_BUFSIZ
, 1+len
-avail
));
1313 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args2
);
1324 * audit_log_format - format a message into the audit buffer.
1326 * @fmt: format string
1327 * @...: optional parameters matching @fmt string
1329 * All the work is done in audit_log_vformat.
1331 void audit_log_format(struct audit_buffer
*ab
, const char *fmt
, ...)
1337 va_start(args
, fmt
);
1338 audit_log_vformat(ab
, fmt
, args
);
1343 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1344 * @ab: the audit_buffer
1345 * @buf: buffer to convert to hex
1346 * @len: length of @buf to be converted
1348 * No return value; failure to expand is silently ignored.
1350 * This function will take the passed buf and convert it into a string of
1351 * ascii hex digits. The new string is placed onto the skb.
1353 void audit_log_n_hex(struct audit_buffer
*ab
, const unsigned char *buf
,
1356 int i
, avail
, new_len
;
1358 struct sk_buff
*skb
;
1359 static const unsigned char *hex
= "0123456789ABCDEF";
1366 avail
= skb_tailroom(skb
);
1368 if (new_len
>= avail
) {
1369 /* Round the buffer request up to the next multiple */
1370 new_len
= AUDIT_BUFSIZ
*(((new_len
-avail
)/AUDIT_BUFSIZ
) + 1);
1371 avail
= audit_expand(ab
, new_len
);
1376 ptr
= skb_tail_pointer(skb
);
1377 for (i
=0; i
<len
; i
++) {
1378 *ptr
++ = hex
[(buf
[i
] & 0xF0)>>4]; /* Upper nibble */
1379 *ptr
++ = hex
[buf
[i
] & 0x0F]; /* Lower nibble */
1382 skb_put(skb
, len
<< 1); /* new string is twice the old string */
1386 * Format a string of no more than slen characters into the audit buffer,
1387 * enclosed in quote marks.
1389 void audit_log_n_string(struct audit_buffer
*ab
, const char *string
,
1394 struct sk_buff
*skb
;
1401 avail
= skb_tailroom(skb
);
1402 new_len
= slen
+ 3; /* enclosing quotes + null terminator */
1403 if (new_len
> avail
) {
1404 avail
= audit_expand(ab
, new_len
);
1408 ptr
= skb_tail_pointer(skb
);
1410 memcpy(ptr
, string
, slen
);
1414 skb_put(skb
, slen
+ 2); /* don't include null terminator */
1418 * audit_string_contains_control - does a string need to be logged in hex
1419 * @string: string to be checked
1420 * @len: max length of the string to check
1422 int audit_string_contains_control(const char *string
, size_t len
)
1424 const unsigned char *p
;
1425 for (p
= string
; p
< (const unsigned char *)string
+ len
; p
++) {
1426 if (*p
== '"' || *p
< 0x21 || *p
> 0x7e)
1433 * audit_log_n_untrustedstring - log a string that may contain random characters
1435 * @len: length of string (not including trailing null)
1436 * @string: string to be logged
1438 * This code will escape a string that is passed to it if the string
1439 * contains a control character, unprintable character, double quote mark,
1440 * or a space. Unescaped strings will start and end with a double quote mark.
1441 * Strings that are escaped are printed in hex (2 digits per char).
1443 * The caller specifies the number of characters in the string to log, which may
1444 * or may not be the entire string.
1446 void audit_log_n_untrustedstring(struct audit_buffer
*ab
, const char *string
,
1449 if (audit_string_contains_control(string
, len
))
1450 audit_log_n_hex(ab
, string
, len
);
1452 audit_log_n_string(ab
, string
, len
);
1456 * audit_log_untrustedstring - log a string that may contain random characters
1458 * @string: string to be logged
1460 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1461 * determine string length.
1463 void audit_log_untrustedstring(struct audit_buffer
*ab
, const char *string
)
1465 audit_log_n_untrustedstring(ab
, string
, strlen(string
));
1468 /* This is a helper-function to print the escaped d_path */
1469 void audit_log_d_path(struct audit_buffer
*ab
, const char *prefix
,
1470 const struct path
*path
)
1475 audit_log_format(ab
, "%s", prefix
);
1477 /* We will allow 11 spaces for ' (deleted)' to be appended */
1478 pathname
= kmalloc(PATH_MAX
+11, ab
->gfp_mask
);
1480 audit_log_string(ab
, "<no_memory>");
1483 p
= d_path(path
, pathname
, PATH_MAX
+11);
1484 if (IS_ERR(p
)) { /* Should never happen since we send PATH_MAX */
1485 /* FIXME: can we save some information here? */
1486 audit_log_string(ab
, "<too_long>");
1488 audit_log_untrustedstring(ab
, p
);
1492 void audit_log_session_info(struct audit_buffer
*ab
)
1494 u32 sessionid
= audit_get_sessionid(current
);
1495 uid_t auid
= from_kuid(&init_user_ns
, audit_get_loginuid(current
));
1497 audit_log_format(ab
, " auid=%u ses=%u", auid
, sessionid
);
1500 void audit_log_key(struct audit_buffer
*ab
, char *key
)
1502 audit_log_format(ab
, " key=");
1504 audit_log_untrustedstring(ab
, key
);
1506 audit_log_format(ab
, "(null)");
1509 void audit_log_cap(struct audit_buffer
*ab
, char *prefix
, kernel_cap_t
*cap
)
1513 audit_log_format(ab
, " %s=", prefix
);
1514 CAP_FOR_EACH_U32(i
) {
1515 audit_log_format(ab
, "%08x",
1516 cap
->cap
[(_KERNEL_CAPABILITY_U32S
-1) - i
]);
1520 void audit_log_fcaps(struct audit_buffer
*ab
, struct audit_names
*name
)
1522 kernel_cap_t
*perm
= &name
->fcap
.permitted
;
1523 kernel_cap_t
*inh
= &name
->fcap
.inheritable
;
1526 if (!cap_isclear(*perm
)) {
1527 audit_log_cap(ab
, "cap_fp", perm
);
1530 if (!cap_isclear(*inh
)) {
1531 audit_log_cap(ab
, "cap_fi", inh
);
1536 audit_log_format(ab
, " cap_fe=%d cap_fver=%x",
1537 name
->fcap
.fE
, name
->fcap_ver
);
1540 static inline int audit_copy_fcaps(struct audit_names
*name
,
1541 const struct dentry
*dentry
)
1543 struct cpu_vfs_cap_data caps
;
1549 rc
= get_vfs_caps_from_disk(dentry
, &caps
);
1553 name
->fcap
.permitted
= caps
.permitted
;
1554 name
->fcap
.inheritable
= caps
.inheritable
;
1555 name
->fcap
.fE
= !!(caps
.magic_etc
& VFS_CAP_FLAGS_EFFECTIVE
);
1556 name
->fcap_ver
= (caps
.magic_etc
& VFS_CAP_REVISION_MASK
) >>
1557 VFS_CAP_REVISION_SHIFT
;
1562 /* Copy inode data into an audit_names. */
1563 void audit_copy_inode(struct audit_names
*name
, const struct dentry
*dentry
,
1564 const struct inode
*inode
)
1566 name
->ino
= inode
->i_ino
;
1567 name
->dev
= inode
->i_sb
->s_dev
;
1568 name
->mode
= inode
->i_mode
;
1569 name
->uid
= inode
->i_uid
;
1570 name
->gid
= inode
->i_gid
;
1571 name
->rdev
= inode
->i_rdev
;
1572 security_inode_getsecid(inode
, &name
->osid
);
1573 audit_copy_fcaps(name
, dentry
);
1577 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1578 * @context: audit_context for the task
1579 * @n: audit_names structure with reportable details
1580 * @path: optional path to report instead of audit_names->name
1581 * @record_num: record number to report when handling a list of names
1582 * @call_panic: optional pointer to int that will be updated if secid fails
1584 void audit_log_name(struct audit_context
*context
, struct audit_names
*n
,
1585 struct path
*path
, int record_num
, int *call_panic
)
1587 struct audit_buffer
*ab
;
1588 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_PATH
);
1592 audit_log_format(ab
, "item=%d", record_num
);
1595 audit_log_d_path(ab
, " name=", path
);
1597 switch (n
->name_len
) {
1598 case AUDIT_NAME_FULL
:
1599 /* log the full path */
1600 audit_log_format(ab
, " name=");
1601 audit_log_untrustedstring(ab
, n
->name
->name
);
1604 /* name was specified as a relative path and the
1605 * directory component is the cwd */
1606 audit_log_d_path(ab
, " name=", &context
->pwd
);
1609 /* log the name's directory component */
1610 audit_log_format(ab
, " name=");
1611 audit_log_n_untrustedstring(ab
, n
->name
->name
,
1615 audit_log_format(ab
, " name=(null)");
1617 if (n
->ino
!= (unsigned long)-1) {
1618 audit_log_format(ab
, " inode=%lu"
1619 " dev=%02x:%02x mode=%#ho"
1620 " ouid=%u ogid=%u rdev=%02x:%02x",
1625 from_kuid(&init_user_ns
, n
->uid
),
1626 from_kgid(&init_user_ns
, n
->gid
),
1633 if (security_secid_to_secctx(
1634 n
->osid
, &ctx
, &len
)) {
1635 audit_log_format(ab
, " osid=%u", n
->osid
);
1639 audit_log_format(ab
, " obj=%s", ctx
);
1640 security_release_secctx(ctx
, len
);
1644 /* log the audit_names record type */
1645 audit_log_format(ab
, " nametype=");
1647 case AUDIT_TYPE_NORMAL
:
1648 audit_log_format(ab
, "NORMAL");
1650 case AUDIT_TYPE_PARENT
:
1651 audit_log_format(ab
, "PARENT");
1653 case AUDIT_TYPE_CHILD_DELETE
:
1654 audit_log_format(ab
, "DELETE");
1656 case AUDIT_TYPE_CHILD_CREATE
:
1657 audit_log_format(ab
, "CREATE");
1660 audit_log_format(ab
, "UNKNOWN");
1664 audit_log_fcaps(ab
, n
);
1668 int audit_log_task_context(struct audit_buffer
*ab
)
1675 security_task_getsecid(current
, &sid
);
1679 error
= security_secid_to_secctx(sid
, &ctx
, &len
);
1681 if (error
!= -EINVAL
)
1686 audit_log_format(ab
, " subj=%s", ctx
);
1687 security_release_secctx(ctx
, len
);
1691 audit_panic("error in audit_log_task_context");
1694 EXPORT_SYMBOL(audit_log_task_context
);
1696 void audit_log_task_info(struct audit_buffer
*ab
, struct task_struct
*tsk
)
1698 const struct cred
*cred
;
1699 char name
[sizeof(tsk
->comm
)];
1700 struct mm_struct
*mm
= tsk
->mm
;
1706 /* tsk == current */
1707 cred
= current_cred();
1709 spin_lock_irq(&tsk
->sighand
->siglock
);
1710 if (tsk
->signal
&& tsk
->signal
->tty
&& tsk
->signal
->tty
->name
)
1711 tty
= tsk
->signal
->tty
->name
;
1714 spin_unlock_irq(&tsk
->sighand
->siglock
);
1716 audit_log_format(ab
,
1717 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1718 " euid=%u suid=%u fsuid=%u"
1719 " egid=%u sgid=%u fsgid=%u ses=%u tty=%s",
1722 from_kuid(&init_user_ns
, audit_get_loginuid(tsk
)),
1723 from_kuid(&init_user_ns
, cred
->uid
),
1724 from_kgid(&init_user_ns
, cred
->gid
),
1725 from_kuid(&init_user_ns
, cred
->euid
),
1726 from_kuid(&init_user_ns
, cred
->suid
),
1727 from_kuid(&init_user_ns
, cred
->fsuid
),
1728 from_kgid(&init_user_ns
, cred
->egid
),
1729 from_kgid(&init_user_ns
, cred
->sgid
),
1730 from_kgid(&init_user_ns
, cred
->fsgid
),
1731 audit_get_sessionid(tsk
), tty
);
1733 get_task_comm(name
, tsk
);
1734 audit_log_format(ab
, " comm=");
1735 audit_log_untrustedstring(ab
, name
);
1738 down_read(&mm
->mmap_sem
);
1740 audit_log_d_path(ab
, " exe=", &mm
->exe_file
->f_path
);
1741 up_read(&mm
->mmap_sem
);
1743 audit_log_task_context(ab
);
1745 EXPORT_SYMBOL(audit_log_task_info
);
1748 * audit_log_link_denied - report a link restriction denial
1749 * @operation: specific link opreation
1750 * @link: the path that triggered the restriction
1752 void audit_log_link_denied(const char *operation
, struct path
*link
)
1754 struct audit_buffer
*ab
;
1755 struct audit_names
*name
;
1757 name
= kzalloc(sizeof(*name
), GFP_NOFS
);
1761 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1762 ab
= audit_log_start(current
->audit_context
, GFP_KERNEL
,
1766 audit_log_format(ab
, "op=%s", operation
);
1767 audit_log_task_info(ab
, current
);
1768 audit_log_format(ab
, " res=0");
1771 /* Generate AUDIT_PATH record with object. */
1772 name
->type
= AUDIT_TYPE_NORMAL
;
1773 audit_copy_inode(name
, link
->dentry
, link
->dentry
->d_inode
);
1774 audit_log_name(current
->audit_context
, name
, link
, 0, NULL
);
1780 * audit_log_end - end one audit record
1781 * @ab: the audit_buffer
1783 * The netlink_* functions cannot be called inside an irq context, so
1784 * the audit buffer is placed on a queue and a tasklet is scheduled to
1785 * remove them from the queue outside the irq context. May be called in
1788 void audit_log_end(struct audit_buffer
*ab
)
1792 if (!audit_rate_check()) {
1793 audit_log_lost("rate limit exceeded");
1795 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
1796 nlh
->nlmsg_len
= ab
->skb
->len
- NLMSG_HDRLEN
;
1799 skb_queue_tail(&audit_skb_queue
, ab
->skb
);
1800 wake_up_interruptible(&kauditd_wait
);
1802 audit_printk_skb(ab
->skb
);
1806 audit_buffer_free(ab
);
1810 * audit_log - Log an audit record
1811 * @ctx: audit context
1812 * @gfp_mask: type of allocation
1813 * @type: audit message type
1814 * @fmt: format string to use
1815 * @...: variable parameters matching the format string
1817 * This is a convenience function that calls audit_log_start,
1818 * audit_log_vformat, and audit_log_end. It may be called
1821 void audit_log(struct audit_context
*ctx
, gfp_t gfp_mask
, int type
,
1822 const char *fmt
, ...)
1824 struct audit_buffer
*ab
;
1827 ab
= audit_log_start(ctx
, gfp_mask
, type
);
1829 va_start(args
, fmt
);
1830 audit_log_vformat(ab
, fmt
, args
);
1836 #ifdef CONFIG_SECURITY
1838 * audit_log_secctx - Converts and logs SELinux context
1840 * @secid: security number
1842 * This is a helper function that calls security_secid_to_secctx to convert
1843 * secid to secctx and then adds the (converted) SELinux context to the audit
1844 * log by calling audit_log_format, thus also preventing leak of internal secid
1845 * to userspace. If secid cannot be converted audit_panic is called.
1847 void audit_log_secctx(struct audit_buffer
*ab
, u32 secid
)
1852 if (security_secid_to_secctx(secid
, &secctx
, &len
)) {
1853 audit_panic("Cannot convert secid to context");
1855 audit_log_format(ab
, " obj=%s", secctx
);
1856 security_release_secctx(secctx
, len
);
1859 EXPORT_SYMBOL(audit_log_secctx
);
1862 EXPORT_SYMBOL(audit_log_start
);
1863 EXPORT_SYMBOL(audit_log_end
);
1864 EXPORT_SYMBOL(audit_log_format
);
1865 EXPORT_SYMBOL(audit_log
);