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rxrpc: Propose, but don't immediately transmit, the final ACK for a call
[linux/fpc-iii.git] / kernel / auditfilter.c
blobeaa320148d97214551c76d8454b944e281bd8737
1 /* auditfilter.c -- filtering of audit events
2 *
3 * Copyright 2003-2004 Red Hat, Inc.
4 * Copyright 2005 Hewlett-Packard Development Company, L.P.
5 * Copyright 2005 IBM Corporation
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24 #include <linux/kernel.h>
25 #include <linux/audit.h>
26 #include <linux/kthread.h>
27 #include <linux/mutex.h>
28 #include <linux/fs.h>
29 #include <linux/namei.h>
30 #include <linux/netlink.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
33 #include <linux/security.h>
34 #include <net/net_namespace.h>
35 #include <net/sock.h>
36 #include "audit.h"
37
38 /*
39 * Locking model:
40 *
41 * audit_filter_mutex:
42 * Synchronizes writes and blocking reads of audit's filterlist
43 * data. Rcu is used to traverse the filterlist and access
44 * contents of structs audit_entry, audit_watch and opaque
45 * LSM rules during filtering. If modified, these structures
46 * must be copied and replace their counterparts in the filterlist.
47 * An audit_parent struct is not accessed during filtering, so may
48 * be written directly provided audit_filter_mutex is held.
49 */
50
51 /* Audit filter lists, defined in <linux/audit.h> */
52 struct list_head audit_filter_list[AUDIT_NR_FILTERS] = {
53 LIST_HEAD_INIT(audit_filter_list[0]),
54 LIST_HEAD_INIT(audit_filter_list[1]),
55 LIST_HEAD_INIT(audit_filter_list[2]),
56 LIST_HEAD_INIT(audit_filter_list[3]),
57 LIST_HEAD_INIT(audit_filter_list[4]),
58 LIST_HEAD_INIT(audit_filter_list[5]),
59 LIST_HEAD_INIT(audit_filter_list[6]),
60 #if AUDIT_NR_FILTERS != 7
61 #error Fix audit_filter_list initialiser
62 #endif
63 };
64 static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = {
65 LIST_HEAD_INIT(audit_rules_list[0]),
66 LIST_HEAD_INIT(audit_rules_list[1]),
67 LIST_HEAD_INIT(audit_rules_list[2]),
68 LIST_HEAD_INIT(audit_rules_list[3]),
69 LIST_HEAD_INIT(audit_rules_list[4]),
70 LIST_HEAD_INIT(audit_rules_list[5]),
71 LIST_HEAD_INIT(audit_rules_list[6]),
72 };
73
74 DEFINE_MUTEX(audit_filter_mutex);
75
76 static void audit_free_lsm_field(struct audit_field *f)
77 {
78 switch (f->type) {
79 case AUDIT_SUBJ_USER:
80 case AUDIT_SUBJ_ROLE:
81 case AUDIT_SUBJ_TYPE:
82 case AUDIT_SUBJ_SEN:
83 case AUDIT_SUBJ_CLR:
84 case AUDIT_OBJ_USER:
85 case AUDIT_OBJ_ROLE:
86 case AUDIT_OBJ_TYPE:
87 case AUDIT_OBJ_LEV_LOW:
88 case AUDIT_OBJ_LEV_HIGH:
89 kfree(f->lsm_str);
90 security_audit_rule_free(f->lsm_rule);
91 }
92 }
93
94 static inline void audit_free_rule(struct audit_entry *e)
95 {
96 int i;
97 struct audit_krule *erule = &e->rule;
98
99 /* some rules don't have associated watches */
100 if (erule->watch)
101 audit_put_watch(erule->watch);
102 if (erule->fields)
103 for (i = 0; i < erule->field_count; i++)
104 audit_free_lsm_field(&erule->fields[i]);
105 kfree(erule->fields);
106 kfree(erule->filterkey);
107 kfree(e);
108 }
109
110 void audit_free_rule_rcu(struct rcu_head *head)
111 {
112 struct audit_entry *e = container_of(head, struct audit_entry, rcu);
113 audit_free_rule(e);
114 }
115
116 /* Initialize an audit filterlist entry. */
117 static inline struct audit_entry *audit_init_entry(u32 field_count)
118 {
119 struct audit_entry *entry;
120 struct audit_field *fields;
121
122 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
123 if (unlikely(!entry))
124 return NULL;
125
126 fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL);
127 if (unlikely(!fields)) {
128 kfree(entry);
129 return NULL;
130 }
131 entry->rule.fields = fields;
132
133 return entry;
134 }
135
136 /* Unpack a filter field's string representation from user-space
137 * buffer. */
138 char *audit_unpack_string(void **bufp, size_t *remain, size_t len)
139 {
140 char *str;
141
142 if (!*bufp || (len == 0) || (len > *remain))
143 return ERR_PTR(-EINVAL);
144
145 /* Of the currently implemented string fields, PATH_MAX
146 * defines the longest valid length.
147 */
148 if (len > PATH_MAX)
149 return ERR_PTR(-ENAMETOOLONG);
150
151 str = kmalloc(len + 1, GFP_KERNEL);
152 if (unlikely(!str))
153 return ERR_PTR(-ENOMEM);
154
155 memcpy(str, *bufp, len);
156 str[len] = 0;
157 *bufp += len;
158 *remain -= len;
159
160 return str;
161 }
162
163 /* Translate an inode field to kernel representation. */
164 static inline int audit_to_inode(struct audit_krule *krule,
165 struct audit_field *f)
166 {
167 if (krule->listnr != AUDIT_FILTER_EXIT ||
168 krule->inode_f || krule->watch || krule->tree ||
169 (f->op != Audit_equal && f->op != Audit_not_equal))
170 return -EINVAL;
171
172 krule->inode_f = f;
173 return 0;
174 }
175
176 static __u32 *classes[AUDIT_SYSCALL_CLASSES];
177
178 int __init audit_register_class(int class, unsigned *list)
179 {
180 __u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL);
181 if (!p)
182 return -ENOMEM;
183 while (*list != ~0U) {
184 unsigned n = *list++;
185 if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) {
186 kfree(p);
187 return -EINVAL;
188 }
189 p[AUDIT_WORD(n)] |= AUDIT_BIT(n);
190 }
191 if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) {
192 kfree(p);
193 return -EINVAL;
194 }
195 classes[class] = p;
196 return 0;
197 }
198
199 int audit_match_class(int class, unsigned syscall)
200 {
201 if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32))
202 return 0;
203 if (unlikely(class >= AUDIT_SYSCALL_CLASSES || !classes[class]))
204 return 0;
205 return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall);
206 }
207
208 #ifdef CONFIG_AUDITSYSCALL
209 static inline int audit_match_class_bits(int class, u32 *mask)
210 {
211 int i;
212
213 if (classes[class]) {
214 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
215 if (mask[i] & classes[class][i])
216 return 0;
217 }
218 return 1;
219 }
220
221 static int audit_match_signal(struct audit_entry *entry)
222 {
223 struct audit_field *arch = entry->rule.arch_f;
224
225 if (!arch) {
226 /* When arch is unspecified, we must check both masks on biarch
227 * as syscall number alone is ambiguous. */
228 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
229 entry->rule.mask) &&
230 audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
231 entry->rule.mask));
232 }
233
234 switch(audit_classify_arch(arch->val)) {
235 case 0: /* native */
236 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
237 entry->rule.mask));
238 case 1: /* 32bit on biarch */
239 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
240 entry->rule.mask));
241 default:
242 return 1;
243 }
244 }
245 #endif
246
247 /* Common user-space to kernel rule translation. */
248 static inline struct audit_entry *audit_to_entry_common(struct audit_rule_data *rule)
249 {
250 unsigned listnr;
251 struct audit_entry *entry;
252 int i, err;
253
254 err = -EINVAL;
255 listnr = rule->flags & ~AUDIT_FILTER_PREPEND;
256 switch(listnr) {
257 default:
258 goto exit_err;
259 #ifdef CONFIG_AUDITSYSCALL
260 case AUDIT_FILTER_ENTRY:
261 pr_err("AUDIT_FILTER_ENTRY is deprecated\n");
262 goto exit_err;
263 case AUDIT_FILTER_EXIT:
264 case AUDIT_FILTER_TASK:
265 #endif
266 case AUDIT_FILTER_USER:
267 case AUDIT_FILTER_TYPE:
268 case AUDIT_FILTER_FS:
269 ;
270 }
271 if (unlikely(rule->action == AUDIT_POSSIBLE)) {
272 pr_err("AUDIT_POSSIBLE is deprecated\n");
273 goto exit_err;
274 }
275 if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS)
276 goto exit_err;
277 if (rule->field_count > AUDIT_MAX_FIELDS)
278 goto exit_err;
279
280 err = -ENOMEM;
281 entry = audit_init_entry(rule->field_count);
282 if (!entry)
283 goto exit_err;
284
285 entry->rule.flags = rule->flags & AUDIT_FILTER_PREPEND;
286 entry->rule.listnr = listnr;
287 entry->rule.action = rule->action;
288 entry->rule.field_count = rule->field_count;
289
290 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
291 entry->rule.mask[i] = rule->mask[i];
292
293 for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) {
294 int bit = AUDIT_BITMASK_SIZE * 32 - i - 1;
295 __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)];
296 __u32 *class;
297
298 if (!(*p & AUDIT_BIT(bit)))
299 continue;
300 *p &= ~AUDIT_BIT(bit);
301 class = classes[i];
302 if (class) {
303 int j;
304 for (j = 0; j < AUDIT_BITMASK_SIZE; j++)
305 entry->rule.mask[j] |= class[j];
306 }
307 }
308
309 return entry;
310
311 exit_err:
312 return ERR_PTR(err);
313 }
314
315 static u32 audit_ops[] =
316 {
317 [Audit_equal] = AUDIT_EQUAL,
318 [Audit_not_equal] = AUDIT_NOT_EQUAL,
319 [Audit_bitmask] = AUDIT_BIT_MASK,
320 [Audit_bittest] = AUDIT_BIT_TEST,
321 [Audit_lt] = AUDIT_LESS_THAN,
322 [Audit_gt] = AUDIT_GREATER_THAN,
323 [Audit_le] = AUDIT_LESS_THAN_OR_EQUAL,
324 [Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL,
325 };
326
327 static u32 audit_to_op(u32 op)
328 {
329 u32 n;
330 for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++)
331 ;
332 return n;
333 }
334
335 /* check if an audit field is valid */
336 static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
337 {
338 switch(f->type) {
339 case AUDIT_MSGTYPE:
340 if (entry->rule.listnr != AUDIT_FILTER_TYPE &&
341 entry->rule.listnr != AUDIT_FILTER_USER)
342 return -EINVAL;
343 break;
344 case AUDIT_FSTYPE:
345 if (entry->rule.listnr != AUDIT_FILTER_FS)
346 return -EINVAL;
347 break;
348 }
349
350 switch(entry->rule.listnr) {
351 case AUDIT_FILTER_FS:
352 switch(f->type) {
353 case AUDIT_FSTYPE:
354 case AUDIT_FILTERKEY:
355 break;
356 default:
357 return -EINVAL;
358 }
359 }
360
361 switch(f->type) {
362 default:
363 return -EINVAL;
364 case AUDIT_UID:
365 case AUDIT_EUID:
366 case AUDIT_SUID:
367 case AUDIT_FSUID:
368 case AUDIT_LOGINUID:
369 case AUDIT_OBJ_UID:
370 case AUDIT_GID:
371 case AUDIT_EGID:
372 case AUDIT_SGID:
373 case AUDIT_FSGID:
374 case AUDIT_OBJ_GID:
375 case AUDIT_PID:
376 case AUDIT_PERS:
377 case AUDIT_MSGTYPE:
378 case AUDIT_PPID:
379 case AUDIT_DEVMAJOR:
380 case AUDIT_DEVMINOR:
381 case AUDIT_EXIT:
382 case AUDIT_SUCCESS:
383 case AUDIT_INODE:
384 case AUDIT_SESSIONID:
385 /* bit ops are only useful on syscall args */
386 if (f->op == Audit_bitmask || f->op == Audit_bittest)
387 return -EINVAL;
388 break;
389 case AUDIT_ARG0:
390 case AUDIT_ARG1:
391 case AUDIT_ARG2:
392 case AUDIT_ARG3:
393 case AUDIT_SUBJ_USER:
394 case AUDIT_SUBJ_ROLE:
395 case AUDIT_SUBJ_TYPE:
396 case AUDIT_SUBJ_SEN:
397 case AUDIT_SUBJ_CLR:
398 case AUDIT_OBJ_USER:
399 case AUDIT_OBJ_ROLE:
400 case AUDIT_OBJ_TYPE:
401 case AUDIT_OBJ_LEV_LOW:
402 case AUDIT_OBJ_LEV_HIGH:
403 case AUDIT_WATCH:
404 case AUDIT_DIR:
405 case AUDIT_FILTERKEY:
406 break;
407 case AUDIT_LOGINUID_SET:
408 if ((f->val != 0) && (f->val != 1))
409 return -EINVAL;
410 /* FALL THROUGH */
411 case AUDIT_ARCH:
412 case AUDIT_FSTYPE:
413 if (f->op != Audit_not_equal && f->op != Audit_equal)
414 return -EINVAL;
415 break;
416 case AUDIT_PERM:
417 if (f->val & ~15)
418 return -EINVAL;
419 break;
420 case AUDIT_FILETYPE:
421 if (f->val & ~S_IFMT)
422 return -EINVAL;
423 break;
424 case AUDIT_FIELD_COMPARE:
425 if (f->val > AUDIT_MAX_FIELD_COMPARE)
426 return -EINVAL;
427 break;
428 case AUDIT_EXE:
429 if (f->op != Audit_not_equal && f->op != Audit_equal)
430 return -EINVAL;
431 if (entry->rule.listnr != AUDIT_FILTER_EXIT)
432 return -EINVAL;
433 break;
434 }
435 return 0;
436 }
437
438 /* Translate struct audit_rule_data to kernel's rule representation. */
439 static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
440 size_t datasz)
441 {
442 int err = 0;
443 struct audit_entry *entry;
444 void *bufp;
445 size_t remain = datasz - sizeof(struct audit_rule_data);
446 int i;
447 char *str;
448 struct audit_fsnotify_mark *audit_mark;
449
450 entry = audit_to_entry_common(data);
451 if (IS_ERR(entry))
452 goto exit_nofree;
453
454 bufp = data->buf;
455 for (i = 0; i < data->field_count; i++) {
456 struct audit_field *f = &entry->rule.fields[i];
457
458 err = -EINVAL;
459
460 f->op = audit_to_op(data->fieldflags[i]);
461 if (f->op == Audit_bad)
462 goto exit_free;
463
464 f->type = data->fields[i];
465 f->val = data->values[i];
466
467 /* Support legacy tests for a valid loginuid */
468 if ((f->type == AUDIT_LOGINUID) && (f->val == AUDIT_UID_UNSET)) {
469 f->type = AUDIT_LOGINUID_SET;
470 f->val = 0;
471 entry->rule.pflags |= AUDIT_LOGINUID_LEGACY;
472 }
473
474 err = audit_field_valid(entry, f);
475 if (err)
476 goto exit_free;
477
478 err = -EINVAL;
479 switch (f->type) {
480 case AUDIT_LOGINUID:
481 case AUDIT_UID:
482 case AUDIT_EUID:
483 case AUDIT_SUID:
484 case AUDIT_FSUID:
485 case AUDIT_OBJ_UID:
486 f->uid = make_kuid(current_user_ns(), f->val);
487 if (!uid_valid(f->uid))
488 goto exit_free;
489 break;
490 case AUDIT_GID:
491 case AUDIT_EGID:
492 case AUDIT_SGID:
493 case AUDIT_FSGID:
494 case AUDIT_OBJ_GID:
495 f->gid = make_kgid(current_user_ns(), f->val);
496 if (!gid_valid(f->gid))
497 goto exit_free;
498 break;
499 case AUDIT_ARCH:
500 entry->rule.arch_f = f;
501 break;
502 case AUDIT_SUBJ_USER:
503 case AUDIT_SUBJ_ROLE:
504 case AUDIT_SUBJ_TYPE:
505 case AUDIT_SUBJ_SEN:
506 case AUDIT_SUBJ_CLR:
507 case AUDIT_OBJ_USER:
508 case AUDIT_OBJ_ROLE:
509 case AUDIT_OBJ_TYPE:
510 case AUDIT_OBJ_LEV_LOW:
511 case AUDIT_OBJ_LEV_HIGH:
512 str = audit_unpack_string(&bufp, &remain, f->val);
513 if (IS_ERR(str))
514 goto exit_free;
515 entry->rule.buflen += f->val;
516
517 err = security_audit_rule_init(f->type, f->op, str,
518 (void **)&f->lsm_rule);
519 /* Keep currently invalid fields around in case they
520 * become valid after a policy reload. */
521 if (err == -EINVAL) {
522 pr_warn("audit rule for LSM \'%s\' is invalid\n",
523 str);
524 err = 0;
525 }
526 if (err) {
527 kfree(str);
528 goto exit_free;
529 } else
530 f->lsm_str = str;
531 break;
532 case AUDIT_WATCH:
533 str = audit_unpack_string(&bufp, &remain, f->val);
534 if (IS_ERR(str))
535 goto exit_free;
536 entry->rule.buflen += f->val;
537
538 err = audit_to_watch(&entry->rule, str, f->val, f->op);
539 if (err) {
540 kfree(str);
541 goto exit_free;
542 }
543 break;
544 case AUDIT_DIR:
545 str = audit_unpack_string(&bufp, &remain, f->val);
546 if (IS_ERR(str))
547 goto exit_free;
548 entry->rule.buflen += f->val;
549
550 err = audit_make_tree(&entry->rule, str, f->op);
551 kfree(str);
552 if (err)
553 goto exit_free;
554 break;
555 case AUDIT_INODE:
556 err = audit_to_inode(&entry->rule, f);
557 if (err)
558 goto exit_free;
559 break;
560 case AUDIT_FILTERKEY:
561 if (entry->rule.filterkey || f->val > AUDIT_MAX_KEY_LEN)
562 goto exit_free;
563 str = audit_unpack_string(&bufp, &remain, f->val);
564 if (IS_ERR(str))
565 goto exit_free;
566 entry->rule.buflen += f->val;
567 entry->rule.filterkey = str;
568 break;
569 case AUDIT_EXE:
570 if (entry->rule.exe || f->val > PATH_MAX)
571 goto exit_free;
572 str = audit_unpack_string(&bufp, &remain, f->val);
573 if (IS_ERR(str)) {
574 err = PTR_ERR(str);
575 goto exit_free;
576 }
577 entry->rule.buflen += f->val;
578
579 audit_mark = audit_alloc_mark(&entry->rule, str, f->val);
580 if (IS_ERR(audit_mark)) {
581 kfree(str);
582 err = PTR_ERR(audit_mark);
583 goto exit_free;
584 }
585 entry->rule.exe = audit_mark;
586 break;
587 }
588 }
589
590 if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal)
591 entry->rule.inode_f = NULL;
592
593 exit_nofree:
594 return entry;
595
596 exit_free:
597 if (entry->rule.tree)
598 audit_put_tree(entry->rule.tree); /* that's the temporary one */
599 if (entry->rule.exe)
600 audit_remove_mark(entry->rule.exe); /* that's the template one */
601 audit_free_rule(entry);
602 return ERR_PTR(err);
603 }
604
605 /* Pack a filter field's string representation into data block. */
606 static inline size_t audit_pack_string(void **bufp, const char *str)
607 {
608 size_t len = strlen(str);
609
610 memcpy(*bufp, str, len);
611 *bufp += len;
612
613 return len;
614 }
615
616 /* Translate kernel rule representation to struct audit_rule_data. */
617 static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
618 {
619 struct audit_rule_data *data;
620 void *bufp;
621 int i;
622
623 data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL);
624 if (unlikely(!data))
625 return NULL;
626 memset(data, 0, sizeof(*data));
627
628 data->flags = krule->flags | krule->listnr;
629 data->action = krule->action;
630 data->field_count = krule->field_count;
631 bufp = data->buf;
632 for (i = 0; i < data->field_count; i++) {
633 struct audit_field *f = &krule->fields[i];
634
635 data->fields[i] = f->type;
636 data->fieldflags[i] = audit_ops[f->op];
637 switch(f->type) {
638 case AUDIT_SUBJ_USER:
639 case AUDIT_SUBJ_ROLE:
640 case AUDIT_SUBJ_TYPE:
641 case AUDIT_SUBJ_SEN:
642 case AUDIT_SUBJ_CLR:
643 case AUDIT_OBJ_USER:
644 case AUDIT_OBJ_ROLE:
645 case AUDIT_OBJ_TYPE:
646 case AUDIT_OBJ_LEV_LOW:
647 case AUDIT_OBJ_LEV_HIGH:
648 data->buflen += data->values[i] =
649 audit_pack_string(&bufp, f->lsm_str);
650 break;
651 case AUDIT_WATCH:
652 data->buflen += data->values[i] =
653 audit_pack_string(&bufp,
654 audit_watch_path(krule->watch));
655 break;
656 case AUDIT_DIR:
657 data->buflen += data->values[i] =
658 audit_pack_string(&bufp,
659 audit_tree_path(krule->tree));
660 break;
661 case AUDIT_FILTERKEY:
662 data->buflen += data->values[i] =
663 audit_pack_string(&bufp, krule->filterkey);
664 break;
665 case AUDIT_EXE:
666 data->buflen += data->values[i] =
667 audit_pack_string(&bufp, audit_mark_path(krule->exe));
668 break;
669 case AUDIT_LOGINUID_SET:
670 if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) {
671 data->fields[i] = AUDIT_LOGINUID;
672 data->values[i] = AUDIT_UID_UNSET;
673 break;
674 }
675 /* fallthrough if set */
676 default:
677 data->values[i] = f->val;
678 }
679 }
680 for (i = 0; i < AUDIT_BITMASK_SIZE; i++) data->mask[i] = krule->mask[i];
681
682 return data;
683 }
684
685 /* Compare two rules in kernel format. Considered success if rules
686 * don't match. */
687 static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
688 {
689 int i;
690
691 if (a->flags != b->flags ||
692 a->pflags != b->pflags ||
693 a->listnr != b->listnr ||
694 a->action != b->action ||
695 a->field_count != b->field_count)
696 return 1;
697
698 for (i = 0; i < a->field_count; i++) {
699 if (a->fields[i].type != b->fields[i].type ||
700 a->fields[i].op != b->fields[i].op)
701 return 1;
702
703 switch(a->fields[i].type) {
704 case AUDIT_SUBJ_USER:
705 case AUDIT_SUBJ_ROLE:
706 case AUDIT_SUBJ_TYPE:
707 case AUDIT_SUBJ_SEN:
708 case AUDIT_SUBJ_CLR:
709 case AUDIT_OBJ_USER:
710 case AUDIT_OBJ_ROLE:
711 case AUDIT_OBJ_TYPE:
712 case AUDIT_OBJ_LEV_LOW:
713 case AUDIT_OBJ_LEV_HIGH:
714 if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str))
715 return 1;
716 break;
717 case AUDIT_WATCH:
718 if (strcmp(audit_watch_path(a->watch),
719 audit_watch_path(b->watch)))
720 return 1;
721 break;
722 case AUDIT_DIR:
723 if (strcmp(audit_tree_path(a->tree),
724 audit_tree_path(b->tree)))
725 return 1;
726 break;
727 case AUDIT_FILTERKEY:
728 /* both filterkeys exist based on above type compare */
729 if (strcmp(a->filterkey, b->filterkey))
730 return 1;
731 break;
732 case AUDIT_EXE:
733 /* both paths exist based on above type compare */
734 if (strcmp(audit_mark_path(a->exe),
735 audit_mark_path(b->exe)))
736 return 1;
737 break;
738 case AUDIT_UID:
739 case AUDIT_EUID:
740 case AUDIT_SUID:
741 case AUDIT_FSUID:
742 case AUDIT_LOGINUID:
743 case AUDIT_OBJ_UID:
744 if (!uid_eq(a->fields[i].uid, b->fields[i].uid))
745 return 1;
746 break;
747 case AUDIT_GID:
748 case AUDIT_EGID:
749 case AUDIT_SGID:
750 case AUDIT_FSGID:
751 case AUDIT_OBJ_GID:
752 if (!gid_eq(a->fields[i].gid, b->fields[i].gid))
753 return 1;
754 break;
755 default:
756 if (a->fields[i].val != b->fields[i].val)
757 return 1;
758 }
759 }
760
761 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
762 if (a->mask[i] != b->mask[i])
763 return 1;
764
765 return 0;
766 }
767
768 /* Duplicate LSM field information. The lsm_rule is opaque, so must be
769 * re-initialized. */
770 static inline int audit_dupe_lsm_field(struct audit_field *df,
771 struct audit_field *sf)
772 {
773 int ret = 0;
774 char *lsm_str;
775
776 /* our own copy of lsm_str */
777 lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL);
778 if (unlikely(!lsm_str))
779 return -ENOMEM;
780 df->lsm_str = lsm_str;
781
782 /* our own (refreshed) copy of lsm_rule */
783 ret = security_audit_rule_init(df->type, df->op, df->lsm_str,
784 (void **)&df->lsm_rule);
785 /* Keep currently invalid fields around in case they
786 * become valid after a policy reload. */
787 if (ret == -EINVAL) {
788 pr_warn("audit rule for LSM \'%s\' is invalid\n",
789 df->lsm_str);
790 ret = 0;
791 }
792
793 return ret;
794 }
795
796 /* Duplicate an audit rule. This will be a deep copy with the exception
797 * of the watch - that pointer is carried over. The LSM specific fields
798 * will be updated in the copy. The point is to be able to replace the old
799 * rule with the new rule in the filterlist, then free the old rule.
800 * The rlist element is undefined; list manipulations are handled apart from
801 * the initial copy. */
802 struct audit_entry *audit_dupe_rule(struct audit_krule *old)
803 {
804 u32 fcount = old->field_count;
805 struct audit_entry *entry;
806 struct audit_krule *new;
807 char *fk;
808 int i, err = 0;
809
810 entry = audit_init_entry(fcount);
811 if (unlikely(!entry))
812 return ERR_PTR(-ENOMEM);
813
814 new = &entry->rule;
815 new->flags = old->flags;
816 new->pflags = old->pflags;
817 new->listnr = old->listnr;
818 new->action = old->action;
819 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
820 new->mask[i] = old->mask[i];
821 new->prio = old->prio;
822 new->buflen = old->buflen;
823 new->inode_f = old->inode_f;
824 new->field_count = old->field_count;
825
826 /*
827 * note that we are OK with not refcounting here; audit_match_tree()
828 * never dereferences tree and we can't get false positives there
829 * since we'd have to have rule gone from the list *and* removed
830 * before the chunks found by lookup had been allocated, i.e. before
831 * the beginning of list scan.
832 */
833 new->tree = old->tree;
834 memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount);
835
836 /* deep copy this information, updating the lsm_rule fields, because
837 * the originals will all be freed when the old rule is freed. */
838 for (i = 0; i < fcount; i++) {
839 switch (new->fields[i].type) {
840 case AUDIT_SUBJ_USER:
841 case AUDIT_SUBJ_ROLE:
842 case AUDIT_SUBJ_TYPE:
843 case AUDIT_SUBJ_SEN:
844 case AUDIT_SUBJ_CLR:
845 case AUDIT_OBJ_USER:
846 case AUDIT_OBJ_ROLE:
847 case AUDIT_OBJ_TYPE:
848 case AUDIT_OBJ_LEV_LOW:
849 case AUDIT_OBJ_LEV_HIGH:
850 err = audit_dupe_lsm_field(&new->fields[i],
851 &old->fields[i]);
852 break;
853 case AUDIT_FILTERKEY:
854 fk = kstrdup(old->filterkey, GFP_KERNEL);
855 if (unlikely(!fk))
856 err = -ENOMEM;
857 else
858 new->filterkey = fk;
859 break;
860 case AUDIT_EXE:
861 err = audit_dupe_exe(new, old);
862 break;
863 }
864 if (err) {
865 if (new->exe)
866 audit_remove_mark(new->exe);
867 audit_free_rule(entry);
868 return ERR_PTR(err);
869 }
870 }
871
872 if (old->watch) {
873 audit_get_watch(old->watch);
874 new->watch = old->watch;
875 }
876
877 return entry;
878 }
879
880 /* Find an existing audit rule.
881 * Caller must hold audit_filter_mutex to prevent stale rule data. */
882 static struct audit_entry *audit_find_rule(struct audit_entry *entry,
883 struct list_head **p)
884 {
885 struct audit_entry *e, *found = NULL;
886 struct list_head *list;
887 int h;
888
889 if (entry->rule.inode_f) {
890 h = audit_hash_ino(entry->rule.inode_f->val);
891 *p = list = &audit_inode_hash[h];
892 } else if (entry->rule.watch) {
893 /* we don't know the inode number, so must walk entire hash */
894 for (h = 0; h < AUDIT_INODE_BUCKETS; h++) {
895 list = &audit_inode_hash[h];
896 list_for_each_entry(e, list, list)
897 if (!audit_compare_rule(&entry->rule, &e->rule)) {
898 found = e;
899 goto out;
900 }
901 }
902 goto out;
903 } else {
904 *p = list = &audit_filter_list[entry->rule.listnr];
905 }
906
907 list_for_each_entry(e, list, list)
908 if (!audit_compare_rule(&entry->rule, &e->rule)) {
909 found = e;
910 goto out;
911 }
912
913 out:
914 return found;
915 }
916
917 static u64 prio_low = ~0ULL/2;
918 static u64 prio_high = ~0ULL/2 - 1;
919
920 /* Add rule to given filterlist if not a duplicate. */
921 static inline int audit_add_rule(struct audit_entry *entry)
922 {
923 struct audit_entry *e;
924 struct audit_watch *watch = entry->rule.watch;
925 struct audit_tree *tree = entry->rule.tree;
926 struct list_head *list;
927 int err = 0;
928 #ifdef CONFIG_AUDITSYSCALL
929 int dont_count = 0;
930
931 /* If any of these, don't count towards total */
932 switch(entry->rule.listnr) {
933 case AUDIT_FILTER_USER:
934 case AUDIT_FILTER_TYPE:
935 case AUDIT_FILTER_FS:
936 dont_count = 1;
937 }
938 #endif
939
940 mutex_lock(&audit_filter_mutex);
941 e = audit_find_rule(entry, &list);
942 if (e) {
943 mutex_unlock(&audit_filter_mutex);
944 err = -EEXIST;
945 /* normally audit_add_tree_rule() will free it on failure */
946 if (tree)
947 audit_put_tree(tree);
948 return err;
949 }
950
951 if (watch) {
952 /* audit_filter_mutex is dropped and re-taken during this call */
953 err = audit_add_watch(&entry->rule, &list);
954 if (err) {
955 mutex_unlock(&audit_filter_mutex);
956 /*
957 * normally audit_add_tree_rule() will free it
958 * on failure
959 */
960 if (tree)
961 audit_put_tree(tree);
962 return err;
963 }
964 }
965 if (tree) {
966 err = audit_add_tree_rule(&entry->rule);
967 if (err) {
968 mutex_unlock(&audit_filter_mutex);
969 return err;
970 }
971 }
972
973 entry->rule.prio = ~0ULL;
974 if (entry->rule.listnr == AUDIT_FILTER_EXIT) {
975 if (entry->rule.flags & AUDIT_FILTER_PREPEND)
976 entry->rule.prio = ++prio_high;
977 else
978 entry->rule.prio = --prio_low;
979 }
980
981 if (entry->rule.flags & AUDIT_FILTER_PREPEND) {
982 list_add(&entry->rule.list,
983 &audit_rules_list[entry->rule.listnr]);
984 list_add_rcu(&entry->list, list);
985 entry->rule.flags &= ~AUDIT_FILTER_PREPEND;
986 } else {
987 list_add_tail(&entry->rule.list,
988 &audit_rules_list[entry->rule.listnr]);
989 list_add_tail_rcu(&entry->list, list);
990 }
991 #ifdef CONFIG_AUDITSYSCALL
992 if (!dont_count)
993 audit_n_rules++;
994
995 if (!audit_match_signal(entry))
996 audit_signals++;
997 #endif
998 mutex_unlock(&audit_filter_mutex);
999
1000 return err;
1001 }
1002
1003 /* Remove an existing rule from filterlist. */
1004 int audit_del_rule(struct audit_entry *entry)
1005 {
1006 struct audit_entry *e;
1007 struct audit_tree *tree = entry->rule.tree;
1008 struct list_head *list;
1009 int ret = 0;
1010 #ifdef CONFIG_AUDITSYSCALL
1011 int dont_count = 0;
1012
1013 /* If any of these, don't count towards total */
1014 switch(entry->rule.listnr) {
1015 case AUDIT_FILTER_USER:
1016 case AUDIT_FILTER_TYPE:
1017 case AUDIT_FILTER_FS:
1018 dont_count = 1;
1019 }
1020 #endif
1021
1022 mutex_lock(&audit_filter_mutex);
1023 e = audit_find_rule(entry, &list);
1024 if (!e) {
1025 ret = -ENOENT;
1026 goto out;
1027 }
1028
1029 if (e->rule.watch)
1030 audit_remove_watch_rule(&e->rule);
1031
1032 if (e->rule.tree)
1033 audit_remove_tree_rule(&e->rule);
1034
1035 if (e->rule.exe)
1036 audit_remove_mark_rule(&e->rule);
1037
1038 #ifdef CONFIG_AUDITSYSCALL
1039 if (!dont_count)
1040 audit_n_rules--;
1041
1042 if (!audit_match_signal(entry))
1043 audit_signals--;
1044 #endif
1045
1046 list_del_rcu(&e->list);
1047 list_del(&e->rule.list);
1048 call_rcu(&e->rcu, audit_free_rule_rcu);
1049
1050 out:
1051 mutex_unlock(&audit_filter_mutex);
1052
1053 if (tree)
1054 audit_put_tree(tree); /* that's the temporary one */
1055
1056 return ret;
1057 }
1058
1059 /* List rules using struct audit_rule_data. */
1060 static void audit_list_rules(int seq, struct sk_buff_head *q)
1061 {
1062 struct sk_buff *skb;
1063 struct audit_krule *r;
1064 int i;
1065
1066 /* This is a blocking read, so use audit_filter_mutex instead of rcu
1067 * iterator to sync with list writers. */
1068 for (i=0; i<AUDIT_NR_FILTERS; i++) {
1069 list_for_each_entry(r, &audit_rules_list[i], list) {
1070 struct audit_rule_data *data;
1071
1072 data = audit_krule_to_data(r);
1073 if (unlikely(!data))
1074 break;
1075 skb = audit_make_reply(seq, AUDIT_LIST_RULES, 0, 1,
1076 data,
1077 sizeof(*data) + data->buflen);
1078 if (skb)
1079 skb_queue_tail(q, skb);
1080 kfree(data);
1081 }
1082 }
1083 skb = audit_make_reply(seq, AUDIT_LIST_RULES, 1, 1, NULL, 0);
1084 if (skb)
1085 skb_queue_tail(q, skb);
1086 }
1087
1088 /* Log rule additions and removals */
1089 static void audit_log_rule_change(char *action, struct audit_krule *rule, int res)
1090 {
1091 struct audit_buffer *ab;
1092
1093 if (!audit_enabled)
1094 return;
1095
1096 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
1097 if (!ab)
1098 return;
1099 audit_log_session_info(ab);
1100 audit_log_task_context(ab);
1101 audit_log_format(ab, " op=%s", action);
1102 audit_log_key(ab, rule->filterkey);
1103 audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
1104 audit_log_end(ab);
1105 }
1106
1107 /**
1108 * audit_rule_change - apply all rules to the specified message type
1109 * @type: audit message type
1110 * @seq: netlink audit message sequence (serial) number
1111 * @data: payload data
1112 * @datasz: size of payload data
1113 */
1114 int audit_rule_change(int type, int seq, void *data, size_t datasz)
1115 {
1116 int err = 0;
1117 struct audit_entry *entry;
1118
1119 entry = audit_data_to_entry(data, datasz);
1120 if (IS_ERR(entry))
1121 return PTR_ERR(entry);
1122
1123 switch (type) {
1124 case AUDIT_ADD_RULE:
1125 err = audit_add_rule(entry);
1126 audit_log_rule_change("add_rule", &entry->rule, !err);
1127 break;
1128 case AUDIT_DEL_RULE:
1129 err = audit_del_rule(entry);
1130 audit_log_rule_change("remove_rule", &entry->rule, !err);
1131 break;
1132 default:
1133 err = -EINVAL;
1134 WARN_ON(1);
1135 }
1136
1137 if (err || type == AUDIT_DEL_RULE) {
1138 if (entry->rule.exe)
1139 audit_remove_mark(entry->rule.exe);
1140 audit_free_rule(entry);
1141 }
1142
1143 return err;
1144 }
1145
1146 /**
1147 * audit_list_rules_send - list the audit rules
1148 * @request_skb: skb of request we are replying to (used to target the reply)
1149 * @seq: netlink audit message sequence (serial) number
1150 */
1151 int audit_list_rules_send(struct sk_buff *request_skb, int seq)
1152 {
1153 u32 portid = NETLINK_CB(request_skb).portid;
1154 struct net *net = sock_net(NETLINK_CB(request_skb).sk);
1155 struct task_struct *tsk;
1156 struct audit_netlink_list *dest;
1157 int err = 0;
1158
1159 /* We can't just spew out the rules here because we might fill
1160 * the available socket buffer space and deadlock waiting for
1161 * auditctl to read from it... which isn't ever going to
1162 * happen if we're actually running in the context of auditctl
1163 * trying to _send_ the stuff */
1164
1165 dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL);
1166 if (!dest)
1167 return -ENOMEM;
1168 dest->net = get_net(net);
1169 dest->portid = portid;
1170 skb_queue_head_init(&dest->q);
1171
1172 mutex_lock(&audit_filter_mutex);
1173 audit_list_rules(seq, &dest->q);
1174 mutex_unlock(&audit_filter_mutex);
1175
1176 tsk = kthread_run(audit_send_list, dest, "audit_send_list");
1177 if (IS_ERR(tsk)) {
1178 skb_queue_purge(&dest->q);
1179 kfree(dest);
1180 err = PTR_ERR(tsk);
1181 }
1182
1183 return err;
1184 }
1185
1186 int audit_comparator(u32 left, u32 op, u32 right)
1187 {
1188 switch (op) {
1189 case Audit_equal:
1190 return (left == right);
1191 case Audit_not_equal:
1192 return (left != right);
1193 case Audit_lt:
1194 return (left < right);
1195 case Audit_le:
1196 return (left <= right);
1197 case Audit_gt:
1198 return (left > right);
1199 case Audit_ge:
1200 return (left >= right);
1201 case Audit_bitmask:
1202 return (left & right);
1203 case Audit_bittest:
1204 return ((left & right) == right);
1205 default:
1206 BUG();
1207 return 0;
1208 }
1209 }
1210
1211 int audit_uid_comparator(kuid_t left, u32 op, kuid_t right)
1212 {
1213 switch (op) {
1214 case Audit_equal:
1215 return uid_eq(left, right);
1216 case Audit_not_equal:
1217 return !uid_eq(left, right);
1218 case Audit_lt:
1219 return uid_lt(left, right);
1220 case Audit_le:
1221 return uid_lte(left, right);
1222 case Audit_gt:
1223 return uid_gt(left, right);
1224 case Audit_ge:
1225 return uid_gte(left, right);
1226 case Audit_bitmask:
1227 case Audit_bittest:
1228 default:
1229 BUG();
1230 return 0;
1231 }
1232 }
1233
1234 int audit_gid_comparator(kgid_t left, u32 op, kgid_t right)
1235 {
1236 switch (op) {
1237 case Audit_equal:
1238 return gid_eq(left, right);
1239 case Audit_not_equal:
1240 return !gid_eq(left, right);
1241 case Audit_lt:
1242 return gid_lt(left, right);
1243 case Audit_le:
1244 return gid_lte(left, right);
1245 case Audit_gt:
1246 return gid_gt(left, right);
1247 case Audit_ge:
1248 return gid_gte(left, right);
1249 case Audit_bitmask:
1250 case Audit_bittest:
1251 default:
1252 BUG();
1253 return 0;
1254 }
1255 }
1256
1257 /**
1258 * parent_len - find the length of the parent portion of a pathname
1259 * @path: pathname of which to determine length
1260 */
1261 int parent_len(const char *path)
1262 {
1263 int plen;
1264 const char *p;
1265
1266 plen = strlen(path);
1267
1268 if (plen == 0)
1269 return plen;
1270
1271 /* disregard trailing slashes */
1272 p = path + plen - 1;
1273 while ((*p == '/') && (p > path))
1274 p--;
1275
1276 /* walk backward until we find the next slash or hit beginning */
1277 while ((*p != '/') && (p > path))
1278 p--;
1279
1280 /* did we find a slash? Then increment to include it in path */
1281 if (*p == '/')
1282 p++;
1283
1284 return p - path;
1285 }
1286
1287 /**
1288 * audit_compare_dname_path - compare given dentry name with last component in
1289 * given path. Return of 0 indicates a match.
1290 * @dname: dentry name that we're comparing
1291 * @path: full pathname that we're comparing
1292 * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL
1293 * here indicates that we must compute this value.
1294 */
1295 int audit_compare_dname_path(const char *dname, const char *path, int parentlen)
1296 {
1297 int dlen, pathlen;
1298 const char *p;
1299
1300 dlen = strlen(dname);
1301 pathlen = strlen(path);
1302 if (pathlen < dlen)
1303 return 1;
1304
1305 parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen;
1306 if (pathlen - parentlen != dlen)
1307 return 1;
1308
1309 p = path + parentlen;
1310
1311 return strncmp(p, dname, dlen);
1312 }
1313
1314 int audit_filter(int msgtype, unsigned int listtype)
1315 {
1316 struct audit_entry *e;
1317 int ret = 1; /* Audit by default */
1318
1319 rcu_read_lock();
1320 if (list_empty(&audit_filter_list[listtype]))
1321 goto unlock_and_return;
1322 list_for_each_entry_rcu(e, &audit_filter_list[listtype], list) {
1323 int i, result = 0;
1324
1325 for (i = 0; i < e->rule.field_count; i++) {
1326 struct audit_field *f = &e->rule.fields[i];
1327 pid_t pid;
1328 u32 sid;
1329
1330 switch (f->type) {
1331 case AUDIT_PID:
1332 pid = task_pid_nr(current);
1333 result = audit_comparator(pid, f->op, f->val);
1334 break;
1335 case AUDIT_UID:
1336 result = audit_uid_comparator(current_uid(), f->op, f->uid);
1337 break;
1338 case AUDIT_GID:
1339 result = audit_gid_comparator(current_gid(), f->op, f->gid);
1340 break;
1341 case AUDIT_LOGINUID:
1342 result = audit_uid_comparator(audit_get_loginuid(current),
1343 f->op, f->uid);
1344 break;
1345 case AUDIT_LOGINUID_SET:
1346 result = audit_comparator(audit_loginuid_set(current),
1347 f->op, f->val);
1348 break;
1349 case AUDIT_MSGTYPE:
1350 result = audit_comparator(msgtype, f->op, f->val);
1351 break;
1352 case AUDIT_SUBJ_USER:
1353 case AUDIT_SUBJ_ROLE:
1354 case AUDIT_SUBJ_TYPE:
1355 case AUDIT_SUBJ_SEN:
1356 case AUDIT_SUBJ_CLR:
1357 if (f->lsm_rule) {
1358 security_task_getsecid(current, &sid);
1359 result = security_audit_rule_match(sid,
1360 f->type, f->op, f->lsm_rule, NULL);
1361 }
1362 break;
1363 default:
1364 goto unlock_and_return;
1365 }
1366 if (result < 0) /* error */
1367 goto unlock_and_return;
1368 if (!result)
1369 break;
1370 }
1371 if (result > 0) {
1372 if (e->rule.action == AUDIT_NEVER || listtype == AUDIT_FILTER_TYPE)
1373 ret = 0;
1374 break;
1375 }
1376 }
1377 unlock_and_return:
1378 rcu_read_unlock();
1379 return ret;
1380 }
1381
1382 static int update_lsm_rule(struct audit_krule *r)
1383 {
1384 struct audit_entry *entry = container_of(r, struct audit_entry, rule);
1385 struct audit_entry *nentry;
1386 int err = 0;
1387
1388 if (!security_audit_rule_known(r))
1389 return 0;
1390
1391 nentry = audit_dupe_rule(r);
1392 if (entry->rule.exe)
1393 audit_remove_mark(entry->rule.exe);
1394 if (IS_ERR(nentry)) {
1395 /* save the first error encountered for the
1396 * return value */
1397 err = PTR_ERR(nentry);
1398 audit_panic("error updating LSM filters");
1399 if (r->watch)
1400 list_del(&r->rlist);
1401 list_del_rcu(&entry->list);
1402 list_del(&r->list);
1403 } else {
1404 if (r->watch || r->tree)
1405 list_replace_init(&r->rlist, &nentry->rule.rlist);
1406 list_replace_rcu(&entry->list, &nentry->list);
1407 list_replace(&r->list, &nentry->rule.list);
1408 }
1409 call_rcu(&entry->rcu, audit_free_rule_rcu);
1410
1411 return err;
1412 }
1413
1414 /* This function will re-initialize the lsm_rule field of all applicable rules.
1415 * It will traverse the filter lists serarching for rules that contain LSM
1416 * specific filter fields. When such a rule is found, it is copied, the
1417 * LSM field is re-initialized, and the old rule is replaced with the
1418 * updated rule. */
1419 int audit_update_lsm_rules(void)
1420 {
1421 struct audit_krule *r, *n;
1422 int i, err = 0;
1423
1424 /* audit_filter_mutex synchronizes the writers */
1425 mutex_lock(&audit_filter_mutex);
1426
1427 for (i = 0; i < AUDIT_NR_FILTERS; i++) {
1428 list_for_each_entry_safe(r, n, &audit_rules_list[i], list) {
1429 int res = update_lsm_rule(r);
1430 if (!err)
1431 err = res;
1432 }
1433 }
1434 mutex_unlock(&audit_filter_mutex);
1435
1436 return err;
1437 }
Linux with added FPC-III support