Commit | Line | Data |
---|---|---|
85c8721f | 1 | /* audit.c -- Auditing support |
1da177e4 LT |
2 | * Gateway between the kernel (e.g., selinux) and the user-space audit daemon. |
3 | * System-call specific features have moved to auditsc.c | |
4 | * | |
5 | * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. | |
6 | * All Rights Reserved. | |
7 | * | |
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. | |
12 | * | |
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. | |
17 | * | |
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 | |
21 | * | |
22 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
23 | * | |
24 | * Goals: 1) Integrate fully with SELinux. | |
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 | |
29 | * generation time): | |
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 | |
36 | * current syscall). | |
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. | |
40 | * | |
85c8721f | 41 | * Example user-space utilities: http://people.redhat.com/sgrubb/audit/ |
1da177e4 LT |
42 | */ |
43 | ||
44 | #include <linux/init.h> | |
1da177e4 | 45 | #include <asm/types.h> |
715b49ef | 46 | #include <asm/atomic.h> |
1da177e4 LT |
47 | #include <linux/mm.h> |
48 | #include <linux/module.h> | |
b7d11258 DW |
49 | #include <linux/err.h> |
50 | #include <linux/kthread.h> | |
1da177e4 LT |
51 | |
52 | #include <linux/audit.h> | |
53 | ||
54 | #include <net/sock.h> | |
93315ed6 | 55 | #include <net/netlink.h> |
1da177e4 LT |
56 | #include <linux/skbuff.h> |
57 | #include <linux/netlink.h> | |
3dc7e315 DG |
58 | #include <linux/selinux.h> |
59 | ||
60 | #include "audit.h" | |
1da177e4 LT |
61 | |
62 | /* No auditing will take place until audit_initialized != 0. | |
63 | * (Initialization happens after skb_init is called.) */ | |
64 | static int audit_initialized; | |
65 | ||
66 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
67 | int audit_enabled; | |
68 | ||
69 | /* Default state when kernel boots without any parameters. */ | |
70 | static int audit_default; | |
71 | ||
72 | /* If auditing cannot proceed, audit_failure selects what happens. */ | |
73 | static int audit_failure = AUDIT_FAIL_PRINTK; | |
74 | ||
75 | /* If audit records are to be written to the netlink socket, audit_pid | |
76 | * contains the (non-zero) pid. */ | |
c2f0c7c3 | 77 | int audit_pid; |
1da177e4 | 78 | |
b0dd25a8 | 79 | /* If audit_rate_limit is non-zero, limit the rate of sending audit records |
1da177e4 LT |
80 | * to that number per second. This prevents DoS attacks, but results in |
81 | * audit records being dropped. */ | |
82 | static int audit_rate_limit; | |
83 | ||
84 | /* Number of outstanding audit_buffers allowed. */ | |
85 | static int audit_backlog_limit = 64; | |
ac4cec44 DW |
86 | static int audit_backlog_wait_time = 60 * HZ; |
87 | static int audit_backlog_wait_overflow = 0; | |
1da177e4 | 88 | |
c2f0c7c3 SG |
89 | /* The identity of the user shutting down the audit system. */ |
90 | uid_t audit_sig_uid = -1; | |
91 | pid_t audit_sig_pid = -1; | |
92 | ||
1da177e4 LT |
93 | /* Records can be lost in several ways: |
94 | 0) [suppressed in audit_alloc] | |
95 | 1) out of memory in audit_log_start [kmalloc of struct audit_buffer] | |
96 | 2) out of memory in audit_log_move [alloc_skb] | |
97 | 3) suppressed due to audit_rate_limit | |
98 | 4) suppressed due to audit_backlog_limit | |
99 | */ | |
100 | static atomic_t audit_lost = ATOMIC_INIT(0); | |
101 | ||
102 | /* The netlink socket. */ | |
103 | static struct sock *audit_sock; | |
104 | ||
b7d11258 | 105 | /* The audit_freelist is a list of pre-allocated audit buffers (if more |
1da177e4 LT |
106 | * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of |
107 | * being placed on the freelist). */ | |
1da177e4 | 108 | static DEFINE_SPINLOCK(audit_freelist_lock); |
b0dd25a8 | 109 | static int audit_freelist_count; |
1da177e4 LT |
110 | static LIST_HEAD(audit_freelist); |
111 | ||
b7d11258 DW |
112 | static struct sk_buff_head audit_skb_queue; |
113 | static struct task_struct *kauditd_task; | |
114 | static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); | |
9ad9ad38 | 115 | static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait); |
1da177e4 LT |
116 | |
117 | /* The netlink socket is only to be read by 1 CPU, which lets us assume | |
23f32d18 | 118 | * that list additions and deletions never happen simultaneously in |
1da177e4 | 119 | * auditsc.c */ |
5a0bbce5 | 120 | DEFINE_MUTEX(audit_netlink_mutex); |
1da177e4 LT |
121 | |
122 | /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting | |
123 | * audit records. Since printk uses a 1024 byte buffer, this buffer | |
124 | * should be at least that large. */ | |
125 | #define AUDIT_BUFSIZ 1024 | |
126 | ||
127 | /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the | |
128 | * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */ | |
129 | #define AUDIT_MAXFREE (2*NR_CPUS) | |
130 | ||
131 | /* The audit_buffer is used when formatting an audit record. The caller | |
132 | * locks briefly to get the record off the freelist or to allocate the | |
133 | * buffer, and locks briefly to send the buffer to the netlink layer or | |
134 | * to place it on a transmit queue. Multiple audit_buffers can be in | |
135 | * use simultaneously. */ | |
136 | struct audit_buffer { | |
137 | struct list_head list; | |
8fc6115c | 138 | struct sk_buff *skb; /* formatted skb ready to send */ |
1da177e4 | 139 | struct audit_context *ctx; /* NULL or associated context */ |
9796fdd8 | 140 | gfp_t gfp_mask; |
1da177e4 LT |
141 | }; |
142 | ||
c0404993 SG |
143 | static void audit_set_pid(struct audit_buffer *ab, pid_t pid) |
144 | { | |
145 | struct nlmsghdr *nlh = (struct nlmsghdr *)ab->skb->data; | |
146 | nlh->nlmsg_pid = pid; | |
147 | } | |
148 | ||
8c8570fb | 149 | void audit_panic(const char *message) |
1da177e4 LT |
150 | { |
151 | switch (audit_failure) | |
152 | { | |
153 | case AUDIT_FAIL_SILENT: | |
154 | break; | |
155 | case AUDIT_FAIL_PRINTK: | |
156 | printk(KERN_ERR "audit: %s\n", message); | |
157 | break; | |
158 | case AUDIT_FAIL_PANIC: | |
159 | panic("audit: %s\n", message); | |
160 | break; | |
161 | } | |
162 | } | |
163 | ||
164 | static inline int audit_rate_check(void) | |
165 | { | |
166 | static unsigned long last_check = 0; | |
167 | static int messages = 0; | |
168 | static DEFINE_SPINLOCK(lock); | |
169 | unsigned long flags; | |
170 | unsigned long now; | |
171 | unsigned long elapsed; | |
172 | int retval = 0; | |
173 | ||
174 | if (!audit_rate_limit) return 1; | |
175 | ||
176 | spin_lock_irqsave(&lock, flags); | |
177 | if (++messages < audit_rate_limit) { | |
178 | retval = 1; | |
179 | } else { | |
180 | now = jiffies; | |
181 | elapsed = now - last_check; | |
182 | if (elapsed > HZ) { | |
183 | last_check = now; | |
184 | messages = 0; | |
185 | retval = 1; | |
186 | } | |
187 | } | |
188 | spin_unlock_irqrestore(&lock, flags); | |
189 | ||
190 | return retval; | |
191 | } | |
192 | ||
b0dd25a8 RD |
193 | /** |
194 | * audit_log_lost - conditionally log lost audit message event | |
195 | * @message: the message stating reason for lost audit message | |
196 | * | |
197 | * Emit at least 1 message per second, even if audit_rate_check is | |
198 | * throttling. | |
199 | * Always increment the lost messages counter. | |
200 | */ | |
1da177e4 LT |
201 | void audit_log_lost(const char *message) |
202 | { | |
203 | static unsigned long last_msg = 0; | |
204 | static DEFINE_SPINLOCK(lock); | |
205 | unsigned long flags; | |
206 | unsigned long now; | |
207 | int print; | |
208 | ||
209 | atomic_inc(&audit_lost); | |
210 | ||
211 | print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit); | |
212 | ||
213 | if (!print) { | |
214 | spin_lock_irqsave(&lock, flags); | |
215 | now = jiffies; | |
216 | if (now - last_msg > HZ) { | |
217 | print = 1; | |
218 | last_msg = now; | |
219 | } | |
220 | spin_unlock_irqrestore(&lock, flags); | |
221 | } | |
222 | ||
223 | if (print) { | |
224 | printk(KERN_WARNING | |
b7d11258 | 225 | "audit: audit_lost=%d audit_rate_limit=%d audit_backlog_limit=%d\n", |
1da177e4 | 226 | atomic_read(&audit_lost), |
1da177e4 LT |
227 | audit_rate_limit, |
228 | audit_backlog_limit); | |
229 | audit_panic(message); | |
230 | } | |
1da177e4 LT |
231 | } |
232 | ||
c94c257c | 233 | static int audit_set_rate_limit(int limit, uid_t loginuid) |
1da177e4 LT |
234 | { |
235 | int old = audit_rate_limit; | |
236 | audit_rate_limit = limit; | |
9ad9ad38 | 237 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
bccf6ae0 | 238 | "audit_rate_limit=%d old=%d by auid=%u", |
c94c257c | 239 | audit_rate_limit, old, loginuid); |
1da177e4 LT |
240 | return old; |
241 | } | |
242 | ||
c94c257c | 243 | static int audit_set_backlog_limit(int limit, uid_t loginuid) |
1da177e4 LT |
244 | { |
245 | int old = audit_backlog_limit; | |
246 | audit_backlog_limit = limit; | |
9ad9ad38 | 247 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
bccf6ae0 | 248 | "audit_backlog_limit=%d old=%d by auid=%u", |
c94c257c | 249 | audit_backlog_limit, old, loginuid); |
1da177e4 LT |
250 | return old; |
251 | } | |
252 | ||
c94c257c | 253 | static int audit_set_enabled(int state, uid_t loginuid) |
1da177e4 LT |
254 | { |
255 | int old = audit_enabled; | |
256 | if (state != 0 && state != 1) | |
257 | return -EINVAL; | |
258 | audit_enabled = state; | |
9ad9ad38 | 259 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
bccf6ae0 | 260 | "audit_enabled=%d old=%d by auid=%u", |
c0404993 | 261 | audit_enabled, old, loginuid); |
1da177e4 LT |
262 | return old; |
263 | } | |
264 | ||
c94c257c | 265 | static int audit_set_failure(int state, uid_t loginuid) |
1da177e4 LT |
266 | { |
267 | int old = audit_failure; | |
268 | if (state != AUDIT_FAIL_SILENT | |
269 | && state != AUDIT_FAIL_PRINTK | |
270 | && state != AUDIT_FAIL_PANIC) | |
271 | return -EINVAL; | |
272 | audit_failure = state; | |
9ad9ad38 | 273 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
bccf6ae0 | 274 | "audit_failure=%d old=%d by auid=%u", |
c0404993 | 275 | audit_failure, old, loginuid); |
1da177e4 LT |
276 | return old; |
277 | } | |
278 | ||
97a41e26 | 279 | static int kauditd_thread(void *dummy) |
b7d11258 DW |
280 | { |
281 | struct sk_buff *skb; | |
282 | ||
283 | while (1) { | |
284 | skb = skb_dequeue(&audit_skb_queue); | |
9ad9ad38 | 285 | wake_up(&audit_backlog_wait); |
b7d11258 DW |
286 | if (skb) { |
287 | if (audit_pid) { | |
288 | int err = netlink_unicast(audit_sock, skb, audit_pid, 0); | |
289 | if (err < 0) { | |
290 | BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */ | |
291 | printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid); | |
292 | audit_pid = 0; | |
293 | } | |
294 | } else { | |
e1b09eba | 295 | printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0)); |
b7d11258 DW |
296 | kfree_skb(skb); |
297 | } | |
298 | } else { | |
299 | DECLARE_WAITQUEUE(wait, current); | |
300 | set_current_state(TASK_INTERRUPTIBLE); | |
301 | add_wait_queue(&kauditd_wait, &wait); | |
302 | ||
7a4ae749 PO |
303 | if (!skb_queue_len(&audit_skb_queue)) { |
304 | try_to_freeze(); | |
b7d11258 | 305 | schedule(); |
7a4ae749 | 306 | } |
b7d11258 DW |
307 | |
308 | __set_current_state(TASK_RUNNING); | |
309 | remove_wait_queue(&kauditd_wait, &wait); | |
310 | } | |
311 | } | |
fe7752ba | 312 | return 0; |
b7d11258 DW |
313 | } |
314 | ||
b0dd25a8 RD |
315 | /** |
316 | * audit_send_reply - send an audit reply message via netlink | |
317 | * @pid: process id to send reply to | |
318 | * @seq: sequence number | |
319 | * @type: audit message type | |
320 | * @done: done (last) flag | |
321 | * @multi: multi-part message flag | |
322 | * @payload: payload data | |
323 | * @size: payload size | |
324 | * | |
325 | * Allocates an skb, builds the netlink message, and sends it to the pid. | |
326 | * No failure notifications. | |
327 | */ | |
1da177e4 LT |
328 | void audit_send_reply(int pid, int seq, int type, int done, int multi, |
329 | void *payload, int size) | |
330 | { | |
331 | struct sk_buff *skb; | |
332 | struct nlmsghdr *nlh; | |
333 | int len = NLMSG_SPACE(size); | |
334 | void *data; | |
335 | int flags = multi ? NLM_F_MULTI : 0; | |
336 | int t = done ? NLMSG_DONE : type; | |
337 | ||
338 | skb = alloc_skb(len, GFP_KERNEL); | |
339 | if (!skb) | |
b7d11258 | 340 | return; |
1da177e4 | 341 | |
b7d11258 | 342 | nlh = NLMSG_PUT(skb, pid, seq, t, size); |
1da177e4 LT |
343 | nlh->nlmsg_flags = flags; |
344 | data = NLMSG_DATA(nlh); | |
345 | memcpy(data, payload, size); | |
b7d11258 DW |
346 | |
347 | /* Ignore failure. It'll only happen if the sender goes away, | |
348 | because our timeout is set to infinite. */ | |
349 | netlink_unicast(audit_sock, skb, pid, 0); | |
1da177e4 LT |
350 | return; |
351 | ||
352 | nlmsg_failure: /* Used by NLMSG_PUT */ | |
353 | if (skb) | |
354 | kfree_skb(skb); | |
355 | } | |
356 | ||
357 | /* | |
358 | * Check for appropriate CAP_AUDIT_ capabilities on incoming audit | |
359 | * control messages. | |
360 | */ | |
361 | static int audit_netlink_ok(kernel_cap_t eff_cap, u16 msg_type) | |
362 | { | |
363 | int err = 0; | |
364 | ||
365 | switch (msg_type) { | |
366 | case AUDIT_GET: | |
367 | case AUDIT_LIST: | |
93315ed6 | 368 | case AUDIT_LIST_RULES: |
1da177e4 LT |
369 | case AUDIT_SET: |
370 | case AUDIT_ADD: | |
93315ed6 | 371 | case AUDIT_ADD_RULE: |
1da177e4 | 372 | case AUDIT_DEL: |
93315ed6 | 373 | case AUDIT_DEL_RULE: |
c2f0c7c3 | 374 | case AUDIT_SIGNAL_INFO: |
1da177e4 LT |
375 | if (!cap_raised(eff_cap, CAP_AUDIT_CONTROL)) |
376 | err = -EPERM; | |
377 | break; | |
05474106 | 378 | case AUDIT_USER: |
209aba03 | 379 | case AUDIT_FIRST_USER_MSG...AUDIT_LAST_USER_MSG: |
90d526c0 | 380 | case AUDIT_FIRST_USER_MSG2...AUDIT_LAST_USER_MSG2: |
1da177e4 LT |
381 | if (!cap_raised(eff_cap, CAP_AUDIT_WRITE)) |
382 | err = -EPERM; | |
383 | break; | |
384 | default: /* bad msg */ | |
385 | err = -EINVAL; | |
386 | } | |
387 | ||
388 | return err; | |
389 | } | |
390 | ||
391 | static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
392 | { | |
393 | u32 uid, pid, seq; | |
394 | void *data; | |
395 | struct audit_status *status_get, status_set; | |
396 | int err; | |
c0404993 | 397 | struct audit_buffer *ab; |
1da177e4 | 398 | u16 msg_type = nlh->nlmsg_type; |
c94c257c | 399 | uid_t loginuid; /* loginuid of sender */ |
c2f0c7c3 | 400 | struct audit_sig_info sig_data; |
1da177e4 LT |
401 | |
402 | err = audit_netlink_ok(NETLINK_CB(skb).eff_cap, msg_type); | |
403 | if (err) | |
404 | return err; | |
405 | ||
b0dd25a8 RD |
406 | /* As soon as there's any sign of userspace auditd, |
407 | * start kauditd to talk to it */ | |
b7d11258 DW |
408 | if (!kauditd_task) |
409 | kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); | |
410 | if (IS_ERR(kauditd_task)) { | |
411 | err = PTR_ERR(kauditd_task); | |
412 | kauditd_task = NULL; | |
413 | return err; | |
414 | } | |
415 | ||
1da177e4 LT |
416 | pid = NETLINK_CREDS(skb)->pid; |
417 | uid = NETLINK_CREDS(skb)->uid; | |
c94c257c | 418 | loginuid = NETLINK_CB(skb).loginuid; |
1da177e4 LT |
419 | seq = nlh->nlmsg_seq; |
420 | data = NLMSG_DATA(nlh); | |
421 | ||
422 | switch (msg_type) { | |
423 | case AUDIT_GET: | |
424 | status_set.enabled = audit_enabled; | |
425 | status_set.failure = audit_failure; | |
426 | status_set.pid = audit_pid; | |
427 | status_set.rate_limit = audit_rate_limit; | |
428 | status_set.backlog_limit = audit_backlog_limit; | |
429 | status_set.lost = atomic_read(&audit_lost); | |
b7d11258 | 430 | status_set.backlog = skb_queue_len(&audit_skb_queue); |
1da177e4 LT |
431 | audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0, |
432 | &status_set, sizeof(status_set)); | |
433 | break; | |
434 | case AUDIT_SET: | |
435 | if (nlh->nlmsg_len < sizeof(struct audit_status)) | |
436 | return -EINVAL; | |
437 | status_get = (struct audit_status *)data; | |
438 | if (status_get->mask & AUDIT_STATUS_ENABLED) { | |
c94c257c | 439 | err = audit_set_enabled(status_get->enabled, loginuid); |
1da177e4 LT |
440 | if (err < 0) return err; |
441 | } | |
442 | if (status_get->mask & AUDIT_STATUS_FAILURE) { | |
c94c257c | 443 | err = audit_set_failure(status_get->failure, loginuid); |
1da177e4 LT |
444 | if (err < 0) return err; |
445 | } | |
446 | if (status_get->mask & AUDIT_STATUS_PID) { | |
447 | int old = audit_pid; | |
448 | audit_pid = status_get->pid; | |
9ad9ad38 | 449 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
bccf6ae0 | 450 | "audit_pid=%d old=%d by auid=%u", |
c94c257c | 451 | audit_pid, old, loginuid); |
1da177e4 LT |
452 | } |
453 | if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) | |
c94c257c | 454 | audit_set_rate_limit(status_get->rate_limit, loginuid); |
1da177e4 | 455 | if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT) |
c94c257c SH |
456 | audit_set_backlog_limit(status_get->backlog_limit, |
457 | loginuid); | |
1da177e4 | 458 | break; |
05474106 | 459 | case AUDIT_USER: |
209aba03 | 460 | case AUDIT_FIRST_USER_MSG...AUDIT_LAST_USER_MSG: |
90d526c0 | 461 | case AUDIT_FIRST_USER_MSG2...AUDIT_LAST_USER_MSG2: |
4a4cd633 DW |
462 | if (!audit_enabled && msg_type != AUDIT_USER_AVC) |
463 | return 0; | |
464 | ||
5bb289b5 | 465 | err = audit_filter_user(&NETLINK_CB(skb), msg_type); |
4a4cd633 DW |
466 | if (err == 1) { |
467 | err = 0; | |
9ad9ad38 | 468 | ab = audit_log_start(NULL, GFP_KERNEL, msg_type); |
4a4cd633 DW |
469 | if (ab) { |
470 | audit_log_format(ab, | |
471 | "user pid=%d uid=%u auid=%u msg='%.1024s'", | |
472 | pid, uid, loginuid, (char *)data); | |
473 | audit_set_pid(ab, pid); | |
474 | audit_log_end(ab); | |
475 | } | |
0f45aa18 | 476 | } |
1da177e4 LT |
477 | break; |
478 | case AUDIT_ADD: | |
479 | case AUDIT_DEL: | |
93315ed6 | 480 | if (nlmsg_len(nlh) < sizeof(struct audit_rule)) |
1da177e4 LT |
481 | return -EINVAL; |
482 | /* fallthrough */ | |
483 | case AUDIT_LIST: | |
1da177e4 | 484 | err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid, |
93315ed6 AG |
485 | uid, seq, data, nlmsg_len(nlh), |
486 | loginuid); | |
487 | break; | |
488 | case AUDIT_ADD_RULE: | |
489 | case AUDIT_DEL_RULE: | |
490 | if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) | |
491 | return -EINVAL; | |
492 | /* fallthrough */ | |
493 | case AUDIT_LIST_RULES: | |
494 | err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid, | |
495 | uid, seq, data, nlmsg_len(nlh), | |
496 | loginuid); | |
1da177e4 | 497 | break; |
c2f0c7c3 SG |
498 | case AUDIT_SIGNAL_INFO: |
499 | sig_data.uid = audit_sig_uid; | |
500 | sig_data.pid = audit_sig_pid; | |
501 | audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO, | |
502 | 0, 0, &sig_data, sizeof(sig_data)); | |
503 | break; | |
1da177e4 LT |
504 | default: |
505 | err = -EINVAL; | |
506 | break; | |
507 | } | |
508 | ||
509 | return err < 0 ? err : 0; | |
510 | } | |
511 | ||
b0dd25a8 RD |
512 | /* |
513 | * Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
1da177e4 | 514 | * processed by audit_receive_msg. Malformed skbs with wrong length are |
b0dd25a8 RD |
515 | * discarded silently. |
516 | */ | |
2a0a6ebe | 517 | static void audit_receive_skb(struct sk_buff *skb) |
1da177e4 LT |
518 | { |
519 | int err; | |
520 | struct nlmsghdr *nlh; | |
521 | u32 rlen; | |
522 | ||
523 | while (skb->len >= NLMSG_SPACE(0)) { | |
524 | nlh = (struct nlmsghdr *)skb->data; | |
525 | if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) | |
2a0a6ebe | 526 | return; |
1da177e4 LT |
527 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
528 | if (rlen > skb->len) | |
529 | rlen = skb->len; | |
530 | if ((err = audit_receive_msg(skb, nlh))) { | |
531 | netlink_ack(skb, nlh, err); | |
532 | } else if (nlh->nlmsg_flags & NLM_F_ACK) | |
533 | netlink_ack(skb, nlh, 0); | |
534 | skb_pull(skb, rlen); | |
535 | } | |
1da177e4 LT |
536 | } |
537 | ||
538 | /* Receive messages from netlink socket. */ | |
539 | static void audit_receive(struct sock *sk, int length) | |
540 | { | |
541 | struct sk_buff *skb; | |
2a0a6ebe | 542 | unsigned int qlen; |
1da177e4 | 543 | |
5a0bbce5 | 544 | mutex_lock(&audit_netlink_mutex); |
1da177e4 | 545 | |
2a0a6ebe HX |
546 | for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) { |
547 | skb = skb_dequeue(&sk->sk_receive_queue); | |
548 | audit_receive_skb(skb); | |
549 | kfree_skb(skb); | |
1da177e4 | 550 | } |
5a0bbce5 | 551 | mutex_unlock(&audit_netlink_mutex); |
1da177e4 LT |
552 | } |
553 | ||
1da177e4 LT |
554 | |
555 | /* Initialize audit support at boot time. */ | |
556 | static int __init audit_init(void) | |
557 | { | |
558 | printk(KERN_INFO "audit: initializing netlink socket (%s)\n", | |
559 | audit_default ? "enabled" : "disabled"); | |
06628607 | 560 | audit_sock = netlink_kernel_create(NETLINK_AUDIT, 0, audit_receive, |
4fdb3bb7 | 561 | THIS_MODULE); |
1da177e4 LT |
562 | if (!audit_sock) |
563 | audit_panic("cannot initialize netlink socket"); | |
71e1c784 AG |
564 | else |
565 | audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 566 | |
b7d11258 | 567 | skb_queue_head_init(&audit_skb_queue); |
1da177e4 LT |
568 | audit_initialized = 1; |
569 | audit_enabled = audit_default; | |
3dc7e315 DG |
570 | |
571 | /* Register the callback with selinux. This callback will be invoked | |
572 | * when a new policy is loaded. */ | |
573 | selinux_audit_set_callback(&selinux_audit_rule_update); | |
574 | ||
9ad9ad38 | 575 | audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); |
1da177e4 LT |
576 | return 0; |
577 | } | |
1da177e4 LT |
578 | __initcall(audit_init); |
579 | ||
580 | /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */ | |
581 | static int __init audit_enable(char *str) | |
582 | { | |
583 | audit_default = !!simple_strtol(str, NULL, 0); | |
584 | printk(KERN_INFO "audit: %s%s\n", | |
585 | audit_default ? "enabled" : "disabled", | |
586 | audit_initialized ? "" : " (after initialization)"); | |
587 | if (audit_initialized) | |
588 | audit_enabled = audit_default; | |
9b41046c | 589 | return 1; |
1da177e4 LT |
590 | } |
591 | ||
592 | __setup("audit=", audit_enable); | |
593 | ||
16e1904e CW |
594 | static void audit_buffer_free(struct audit_buffer *ab) |
595 | { | |
596 | unsigned long flags; | |
597 | ||
8fc6115c CW |
598 | if (!ab) |
599 | return; | |
600 | ||
5ac52f33 CW |
601 | if (ab->skb) |
602 | kfree_skb(ab->skb); | |
b7d11258 | 603 | |
16e1904e CW |
604 | spin_lock_irqsave(&audit_freelist_lock, flags); |
605 | if (++audit_freelist_count > AUDIT_MAXFREE) | |
606 | kfree(ab); | |
607 | else | |
608 | list_add(&ab->list, &audit_freelist); | |
609 | spin_unlock_irqrestore(&audit_freelist_lock, flags); | |
610 | } | |
611 | ||
c0404993 | 612 | static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, |
dd0fc66f | 613 | gfp_t gfp_mask, int type) |
16e1904e CW |
614 | { |
615 | unsigned long flags; | |
616 | struct audit_buffer *ab = NULL; | |
c0404993 | 617 | struct nlmsghdr *nlh; |
16e1904e CW |
618 | |
619 | spin_lock_irqsave(&audit_freelist_lock, flags); | |
620 | if (!list_empty(&audit_freelist)) { | |
621 | ab = list_entry(audit_freelist.next, | |
622 | struct audit_buffer, list); | |
623 | list_del(&ab->list); | |
624 | --audit_freelist_count; | |
625 | } | |
626 | spin_unlock_irqrestore(&audit_freelist_lock, flags); | |
627 | ||
628 | if (!ab) { | |
4332bdd3 | 629 | ab = kmalloc(sizeof(*ab), gfp_mask); |
16e1904e | 630 | if (!ab) |
8fc6115c | 631 | goto err; |
16e1904e | 632 | } |
8fc6115c | 633 | |
4332bdd3 | 634 | ab->skb = alloc_skb(AUDIT_BUFSIZ, gfp_mask); |
5ac52f33 | 635 | if (!ab->skb) |
8fc6115c CW |
636 | goto err; |
637 | ||
b7d11258 | 638 | ab->ctx = ctx; |
9ad9ad38 | 639 | ab->gfp_mask = gfp_mask; |
c0404993 SG |
640 | nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0)); |
641 | nlh->nlmsg_type = type; | |
642 | nlh->nlmsg_flags = 0; | |
643 | nlh->nlmsg_pid = 0; | |
644 | nlh->nlmsg_seq = 0; | |
16e1904e | 645 | return ab; |
8fc6115c CW |
646 | err: |
647 | audit_buffer_free(ab); | |
648 | return NULL; | |
16e1904e | 649 | } |
1da177e4 | 650 | |
b0dd25a8 RD |
651 | /** |
652 | * audit_serial - compute a serial number for the audit record | |
653 | * | |
654 | * Compute a serial number for the audit record. Audit records are | |
bfb4496e DW |
655 | * written to user-space as soon as they are generated, so a complete |
656 | * audit record may be written in several pieces. The timestamp of the | |
657 | * record and this serial number are used by the user-space tools to | |
658 | * determine which pieces belong to the same audit record. The | |
659 | * (timestamp,serial) tuple is unique for each syscall and is live from | |
660 | * syscall entry to syscall exit. | |
661 | * | |
bfb4496e DW |
662 | * NOTE: Another possibility is to store the formatted records off the |
663 | * audit context (for those records that have a context), and emit them | |
664 | * all at syscall exit. However, this could delay the reporting of | |
665 | * significant errors until syscall exit (or never, if the system | |
b0dd25a8 RD |
666 | * halts). |
667 | */ | |
bfb4496e DW |
668 | unsigned int audit_serial(void) |
669 | { | |
d5b454f2 DW |
670 | static spinlock_t serial_lock = SPIN_LOCK_UNLOCKED; |
671 | static unsigned int serial = 0; | |
672 | ||
673 | unsigned long flags; | |
674 | unsigned int ret; | |
bfb4496e | 675 | |
d5b454f2 | 676 | spin_lock_irqsave(&serial_lock, flags); |
bfb4496e | 677 | do { |
ce625a80 DW |
678 | ret = ++serial; |
679 | } while (unlikely(!ret)); | |
d5b454f2 | 680 | spin_unlock_irqrestore(&serial_lock, flags); |
bfb4496e | 681 | |
d5b454f2 | 682 | return ret; |
bfb4496e DW |
683 | } |
684 | ||
685 | static inline void audit_get_stamp(struct audit_context *ctx, | |
686 | struct timespec *t, unsigned int *serial) | |
687 | { | |
688 | if (ctx) | |
689 | auditsc_get_stamp(ctx, t, serial); | |
690 | else { | |
691 | *t = CURRENT_TIME; | |
692 | *serial = audit_serial(); | |
693 | } | |
694 | } | |
695 | ||
1da177e4 LT |
696 | /* Obtain an audit buffer. This routine does locking to obtain the |
697 | * audit buffer, but then no locking is required for calls to | |
698 | * audit_log_*format. If the tsk is a task that is currently in a | |
699 | * syscall, then the syscall is marked as auditable and an audit record | |
700 | * will be written at syscall exit. If there is no associated task, tsk | |
701 | * should be NULL. */ | |
9ad9ad38 | 702 | |
b0dd25a8 RD |
703 | /** |
704 | * audit_log_start - obtain an audit buffer | |
705 | * @ctx: audit_context (may be NULL) | |
706 | * @gfp_mask: type of allocation | |
707 | * @type: audit message type | |
708 | * | |
709 | * Returns audit_buffer pointer on success or NULL on error. | |
710 | * | |
711 | * Obtain an audit buffer. This routine does locking to obtain the | |
712 | * audit buffer, but then no locking is required for calls to | |
713 | * audit_log_*format. If the task (ctx) is a task that is currently in a | |
714 | * syscall, then the syscall is marked as auditable and an audit record | |
715 | * will be written at syscall exit. If there is no associated task, then | |
716 | * task context (ctx) should be NULL. | |
717 | */ | |
9796fdd8 | 718 | struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, |
9ad9ad38 | 719 | int type) |
1da177e4 LT |
720 | { |
721 | struct audit_buffer *ab = NULL; | |
1da177e4 | 722 | struct timespec t; |
d812ddbb | 723 | unsigned int serial; |
9ad9ad38 | 724 | int reserve; |
ac4cec44 | 725 | unsigned long timeout_start = jiffies; |
1da177e4 LT |
726 | |
727 | if (!audit_initialized) | |
728 | return NULL; | |
729 | ||
c8edc80c DK |
730 | if (unlikely(audit_filter_type(type))) |
731 | return NULL; | |
732 | ||
9ad9ad38 DW |
733 | if (gfp_mask & __GFP_WAIT) |
734 | reserve = 0; | |
735 | else | |
736 | reserve = 5; /* Allow atomic callers to go up to five | |
737 | entries over the normal backlog limit */ | |
738 | ||
739 | while (audit_backlog_limit | |
740 | && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { | |
ac4cec44 DW |
741 | if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time |
742 | && time_before(jiffies, timeout_start + audit_backlog_wait_time)) { | |
743 | ||
9ad9ad38 DW |
744 | /* Wait for auditd to drain the queue a little */ |
745 | DECLARE_WAITQUEUE(wait, current); | |
746 | set_current_state(TASK_INTERRUPTIBLE); | |
747 | add_wait_queue(&audit_backlog_wait, &wait); | |
748 | ||
749 | if (audit_backlog_limit && | |
750 | skb_queue_len(&audit_skb_queue) > audit_backlog_limit) | |
ac4cec44 | 751 | schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies); |
9ad9ad38 DW |
752 | |
753 | __set_current_state(TASK_RUNNING); | |
754 | remove_wait_queue(&audit_backlog_wait, &wait); | |
ac4cec44 | 755 | continue; |
9ad9ad38 | 756 | } |
fb19b4c6 DW |
757 | if (audit_rate_check()) |
758 | printk(KERN_WARNING | |
759 | "audit: audit_backlog=%d > " | |
760 | "audit_backlog_limit=%d\n", | |
761 | skb_queue_len(&audit_skb_queue), | |
762 | audit_backlog_limit); | |
763 | audit_log_lost("backlog limit exceeded"); | |
ac4cec44 DW |
764 | audit_backlog_wait_time = audit_backlog_wait_overflow; |
765 | wake_up(&audit_backlog_wait); | |
fb19b4c6 DW |
766 | return NULL; |
767 | } | |
768 | ||
9ad9ad38 | 769 | ab = audit_buffer_alloc(ctx, gfp_mask, type); |
1da177e4 LT |
770 | if (!ab) { |
771 | audit_log_lost("out of memory in audit_log_start"); | |
772 | return NULL; | |
773 | } | |
774 | ||
bfb4496e | 775 | audit_get_stamp(ab->ctx, &t, &serial); |
197c69c6 | 776 | |
1da177e4 LT |
777 | audit_log_format(ab, "audit(%lu.%03lu:%u): ", |
778 | t.tv_sec, t.tv_nsec/1000000, serial); | |
779 | return ab; | |
780 | } | |
781 | ||
8fc6115c | 782 | /** |
5ac52f33 | 783 | * audit_expand - expand skb in the audit buffer |
8fc6115c | 784 | * @ab: audit_buffer |
b0dd25a8 | 785 | * @extra: space to add at tail of the skb |
8fc6115c CW |
786 | * |
787 | * Returns 0 (no space) on failed expansion, or available space if | |
788 | * successful. | |
789 | */ | |
e3b926b4 | 790 | static inline int audit_expand(struct audit_buffer *ab, int extra) |
8fc6115c | 791 | { |
5ac52f33 | 792 | struct sk_buff *skb = ab->skb; |
e3b926b4 | 793 | int ret = pskb_expand_head(skb, skb_headroom(skb), extra, |
9ad9ad38 | 794 | ab->gfp_mask); |
5ac52f33 CW |
795 | if (ret < 0) { |
796 | audit_log_lost("out of memory in audit_expand"); | |
8fc6115c | 797 | return 0; |
5ac52f33 CW |
798 | } |
799 | return skb_tailroom(skb); | |
8fc6115c | 800 | } |
1da177e4 | 801 | |
b0dd25a8 RD |
802 | /* |
803 | * Format an audit message into the audit buffer. If there isn't enough | |
1da177e4 LT |
804 | * room in the audit buffer, more room will be allocated and vsnprint |
805 | * will be called a second time. Currently, we assume that a printk | |
b0dd25a8 RD |
806 | * can't format message larger than 1024 bytes, so we don't either. |
807 | */ | |
1da177e4 LT |
808 | static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, |
809 | va_list args) | |
810 | { | |
811 | int len, avail; | |
5ac52f33 | 812 | struct sk_buff *skb; |
eecb0a73 | 813 | va_list args2; |
1da177e4 LT |
814 | |
815 | if (!ab) | |
816 | return; | |
817 | ||
5ac52f33 CW |
818 | BUG_ON(!ab->skb); |
819 | skb = ab->skb; | |
820 | avail = skb_tailroom(skb); | |
821 | if (avail == 0) { | |
e3b926b4 | 822 | avail = audit_expand(ab, AUDIT_BUFSIZ); |
8fc6115c CW |
823 | if (!avail) |
824 | goto out; | |
1da177e4 | 825 | } |
eecb0a73 | 826 | va_copy(args2, args); |
5ac52f33 | 827 | len = vsnprintf(skb->tail, avail, fmt, args); |
1da177e4 LT |
828 | if (len >= avail) { |
829 | /* The printk buffer is 1024 bytes long, so if we get | |
830 | * here and AUDIT_BUFSIZ is at least 1024, then we can | |
831 | * log everything that printk could have logged. */ | |
b0dd25a8 RD |
832 | avail = audit_expand(ab, |
833 | max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); | |
8fc6115c CW |
834 | if (!avail) |
835 | goto out; | |
eecb0a73 | 836 | len = vsnprintf(skb->tail, avail, fmt, args2); |
1da177e4 | 837 | } |
168b7173 SG |
838 | if (len > 0) |
839 | skb_put(skb, len); | |
8fc6115c CW |
840 | out: |
841 | return; | |
1da177e4 LT |
842 | } |
843 | ||
b0dd25a8 RD |
844 | /** |
845 | * audit_log_format - format a message into the audit buffer. | |
846 | * @ab: audit_buffer | |
847 | * @fmt: format string | |
848 | * @...: optional parameters matching @fmt string | |
849 | * | |
850 | * All the work is done in audit_log_vformat. | |
851 | */ | |
1da177e4 LT |
852 | void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) |
853 | { | |
854 | va_list args; | |
855 | ||
856 | if (!ab) | |
857 | return; | |
858 | va_start(args, fmt); | |
859 | audit_log_vformat(ab, fmt, args); | |
860 | va_end(args); | |
861 | } | |
862 | ||
b0dd25a8 RD |
863 | /** |
864 | * audit_log_hex - convert a buffer to hex and append it to the audit skb | |
865 | * @ab: the audit_buffer | |
866 | * @buf: buffer to convert to hex | |
867 | * @len: length of @buf to be converted | |
868 | * | |
869 | * No return value; failure to expand is silently ignored. | |
870 | * | |
871 | * This function will take the passed buf and convert it into a string of | |
872 | * ascii hex digits. The new string is placed onto the skb. | |
873 | */ | |
874 | void audit_log_hex(struct audit_buffer *ab, const unsigned char *buf, | |
168b7173 | 875 | size_t len) |
83c7d091 | 876 | { |
168b7173 SG |
877 | int i, avail, new_len; |
878 | unsigned char *ptr; | |
879 | struct sk_buff *skb; | |
880 | static const unsigned char *hex = "0123456789ABCDEF"; | |
881 | ||
882 | BUG_ON(!ab->skb); | |
883 | skb = ab->skb; | |
884 | avail = skb_tailroom(skb); | |
885 | new_len = len<<1; | |
886 | if (new_len >= avail) { | |
887 | /* Round the buffer request up to the next multiple */ | |
888 | new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1); | |
889 | avail = audit_expand(ab, new_len); | |
890 | if (!avail) | |
891 | return; | |
892 | } | |
83c7d091 | 893 | |
168b7173 SG |
894 | ptr = skb->tail; |
895 | for (i=0; i<len; i++) { | |
896 | *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */ | |
897 | *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */ | |
898 | } | |
899 | *ptr = 0; | |
900 | skb_put(skb, len << 1); /* new string is twice the old string */ | |
83c7d091 | 901 | } |
902 | ||
b0dd25a8 RD |
903 | /** |
904 | * audit_log_unstrustedstring - log a string that may contain random characters | |
905 | * @ab: audit_buffer | |
906 | * @string: string to be logged | |
907 | * | |
908 | * This code will escape a string that is passed to it if the string | |
909 | * contains a control character, unprintable character, double quote mark, | |
168b7173 | 910 | * or a space. Unescaped strings will start and end with a double quote mark. |
b0dd25a8 RD |
911 | * Strings that are escaped are printed in hex (2 digits per char). |
912 | */ | |
83c7d091 | 913 | void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) |
914 | { | |
81b7854d | 915 | const unsigned char *p = string; |
83c7d091 | 916 | |
917 | while (*p) { | |
168b7173 | 918 | if (*p == '"' || *p < 0x21 || *p > 0x7f) { |
83c7d091 | 919 | audit_log_hex(ab, string, strlen(string)); |
920 | return; | |
921 | } | |
922 | p++; | |
923 | } | |
924 | audit_log_format(ab, "\"%s\"", string); | |
925 | } | |
926 | ||
168b7173 | 927 | /* This is a helper-function to print the escaped d_path */ |
1da177e4 LT |
928 | void audit_log_d_path(struct audit_buffer *ab, const char *prefix, |
929 | struct dentry *dentry, struct vfsmount *vfsmnt) | |
930 | { | |
168b7173 | 931 | char *p, *path; |
1da177e4 | 932 | |
8fc6115c CW |
933 | if (prefix) |
934 | audit_log_format(ab, " %s", prefix); | |
1da177e4 | 935 | |
168b7173 | 936 | /* We will allow 11 spaces for ' (deleted)' to be appended */ |
9ad9ad38 | 937 | path = kmalloc(PATH_MAX+11, ab->gfp_mask); |
168b7173 SG |
938 | if (!path) { |
939 | audit_log_format(ab, "<no memory>"); | |
940 | return; | |
1da177e4 | 941 | } |
168b7173 SG |
942 | p = d_path(dentry, vfsmnt, path, PATH_MAX+11); |
943 | if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ | |
944 | /* FIXME: can we save some information here? */ | |
945 | audit_log_format(ab, "<too long>"); | |
946 | } else | |
947 | audit_log_untrustedstring(ab, p); | |
948 | kfree(path); | |
1da177e4 LT |
949 | } |
950 | ||
b0dd25a8 RD |
951 | /** |
952 | * audit_log_end - end one audit record | |
953 | * @ab: the audit_buffer | |
954 | * | |
955 | * The netlink_* functions cannot be called inside an irq context, so | |
956 | * the audit buffer is placed on a queue and a tasklet is scheduled to | |
1da177e4 | 957 | * remove them from the queue outside the irq context. May be called in |
b0dd25a8 RD |
958 | * any context. |
959 | */ | |
b7d11258 | 960 | void audit_log_end(struct audit_buffer *ab) |
1da177e4 | 961 | { |
1da177e4 LT |
962 | if (!ab) |
963 | return; | |
964 | if (!audit_rate_check()) { | |
965 | audit_log_lost("rate limit exceeded"); | |
966 | } else { | |
b7d11258 DW |
967 | if (audit_pid) { |
968 | struct nlmsghdr *nlh = (struct nlmsghdr *)ab->skb->data; | |
969 | nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0); | |
970 | skb_queue_tail(&audit_skb_queue, ab->skb); | |
971 | ab->skb = NULL; | |
972 | wake_up_interruptible(&kauditd_wait); | |
973 | } else { | |
e1b09eba | 974 | printk(KERN_NOTICE "%s\n", ab->skb->data + NLMSG_SPACE(0)); |
b7d11258 | 975 | } |
1da177e4 | 976 | } |
16e1904e | 977 | audit_buffer_free(ab); |
1da177e4 LT |
978 | } |
979 | ||
b0dd25a8 RD |
980 | /** |
981 | * audit_log - Log an audit record | |
982 | * @ctx: audit context | |
983 | * @gfp_mask: type of allocation | |
984 | * @type: audit message type | |
985 | * @fmt: format string to use | |
986 | * @...: variable parameters matching the format string | |
987 | * | |
988 | * This is a convenience function that calls audit_log_start, | |
989 | * audit_log_vformat, and audit_log_end. It may be called | |
990 | * in any context. | |
991 | */ | |
9796fdd8 | 992 | void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, |
9ad9ad38 | 993 | const char *fmt, ...) |
1da177e4 LT |
994 | { |
995 | struct audit_buffer *ab; | |
996 | va_list args; | |
997 | ||
9ad9ad38 | 998 | ab = audit_log_start(ctx, gfp_mask, type); |
1da177e4 LT |
999 | if (ab) { |
1000 | va_start(args, fmt); | |
1001 | audit_log_vformat(ab, fmt, args); | |
1002 | va_end(args); | |
1003 | audit_log_end(ab); | |
1004 | } | |
1005 | } | |
bf45da97 | 1006 | |
1007 | EXPORT_SYMBOL(audit_log_start); | |
1008 | EXPORT_SYMBOL(audit_log_end); | |
1009 | EXPORT_SYMBOL(audit_log_format); | |
1010 | EXPORT_SYMBOL(audit_log); |