Commit | Line | Data |
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cfcad62c EP |
1 | /* audit_watch.c -- watching inodes |
2 | * | |
3 | * Copyright 2003-2009 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 | #include <linux/kernel.h> | |
23 | #include <linux/audit.h> | |
24 | #include <linux/kthread.h> | |
25 | #include <linux/mutex.h> | |
26 | #include <linux/fs.h> | |
e9fd702a | 27 | #include <linux/fsnotify_backend.h> |
cfcad62c EP |
28 | #include <linux/namei.h> |
29 | #include <linux/netlink.h> | |
30 | #include <linux/sched.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
cfcad62c EP |
32 | #include <linux/security.h> |
33 | #include "audit.h" | |
34 | ||
35 | /* | |
36 | * Reference counting: | |
37 | * | |
e9fd702a | 38 | * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED |
cfcad62c EP |
39 | * event. Each audit_watch holds a reference to its associated parent. |
40 | * | |
41 | * audit_watch: if added to lists, lifetime is from audit_init_watch() to | |
42 | * audit_remove_watch(). Additionally, an audit_watch may exist | |
43 | * temporarily to assist in searching existing filter data. Each | |
44 | * audit_krule holds a reference to its associated watch. | |
45 | */ | |
46 | ||
47 | struct audit_watch { | |
48 | atomic_t count; /* reference count */ | |
cfcad62c | 49 | dev_t dev; /* associated superblock device */ |
e08b061e | 50 | char *path; /* insertion path */ |
cfcad62c EP |
51 | unsigned long ino; /* associated inode number */ |
52 | struct audit_parent *parent; /* associated parent */ | |
53 | struct list_head wlist; /* entry in parent->watches list */ | |
ae7b8f41 | 54 | struct list_head rules; /* anchor for krule->rlist */ |
cfcad62c EP |
55 | }; |
56 | ||
57 | struct audit_parent { | |
ae7b8f41 | 58 | struct list_head watches; /* anchor for audit_watch->wlist */ |
e61ce867 | 59 | struct fsnotify_mark mark; /* fsnotify mark on the inode */ |
cfcad62c EP |
60 | }; |
61 | ||
e9fd702a EP |
62 | /* fsnotify handle. */ |
63 | struct fsnotify_group *audit_watch_group; | |
cfcad62c | 64 | |
e9fd702a EP |
65 | /* fsnotify events we care about. */ |
66 | #define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\ | |
67 | FS_MOVE_SELF | FS_EVENT_ON_CHILD) | |
cfcad62c | 68 | |
ae7b8f41 EP |
69 | static void audit_free_parent(struct audit_parent *parent) |
70 | { | |
71 | WARN_ON(!list_empty(&parent->watches)); | |
72 | kfree(parent); | |
73 | } | |
74 | ||
e61ce867 | 75 | static void audit_watch_free_mark(struct fsnotify_mark *entry) |
cfcad62c EP |
76 | { |
77 | struct audit_parent *parent; | |
78 | ||
e9fd702a | 79 | parent = container_of(entry, struct audit_parent, mark); |
ae7b8f41 | 80 | audit_free_parent(parent); |
cfcad62c EP |
81 | } |
82 | ||
e9fd702a EP |
83 | static void audit_get_parent(struct audit_parent *parent) |
84 | { | |
85 | if (likely(parent)) | |
86 | fsnotify_get_mark(&parent->mark); | |
87 | } | |
88 | ||
89 | static void audit_put_parent(struct audit_parent *parent) | |
90 | { | |
91 | if (likely(parent)) | |
92 | fsnotify_put_mark(&parent->mark); | |
93 | } | |
94 | ||
95 | /* | |
96 | * Find and return the audit_parent on the given inode. If found a reference | |
97 | * is taken on this parent. | |
98 | */ | |
99 | static inline struct audit_parent *audit_find_parent(struct inode *inode) | |
100 | { | |
101 | struct audit_parent *parent = NULL; | |
e61ce867 | 102 | struct fsnotify_mark *entry; |
e9fd702a EP |
103 | |
104 | spin_lock(&inode->i_lock); | |
105 | entry = fsnotify_find_mark_entry(audit_watch_group, inode); | |
106 | spin_unlock(&inode->i_lock); | |
107 | ||
108 | if (entry) | |
109 | parent = container_of(entry, struct audit_parent, mark); | |
110 | ||
111 | return parent; | |
112 | } | |
113 | ||
cfcad62c EP |
114 | void audit_get_watch(struct audit_watch *watch) |
115 | { | |
116 | atomic_inc(&watch->count); | |
117 | } | |
118 | ||
119 | void audit_put_watch(struct audit_watch *watch) | |
120 | { | |
121 | if (atomic_dec_and_test(&watch->count)) { | |
122 | WARN_ON(watch->parent); | |
123 | WARN_ON(!list_empty(&watch->rules)); | |
124 | kfree(watch->path); | |
125 | kfree(watch); | |
126 | } | |
127 | } | |
128 | ||
129 | void audit_remove_watch(struct audit_watch *watch) | |
130 | { | |
131 | list_del(&watch->wlist); | |
e9fd702a | 132 | audit_put_parent(watch->parent); |
cfcad62c EP |
133 | watch->parent = NULL; |
134 | audit_put_watch(watch); /* match initial get */ | |
135 | } | |
136 | ||
137 | char *audit_watch_path(struct audit_watch *watch) | |
138 | { | |
139 | return watch->path; | |
140 | } | |
141 | ||
ae7b8f41 | 142 | int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev) |
cfcad62c | 143 | { |
ae7b8f41 EP |
144 | return (watch->ino != (unsigned long)-1) && |
145 | (watch->ino == ino) && | |
146 | (watch->dev == dev); | |
cfcad62c EP |
147 | } |
148 | ||
149 | /* Initialize a parent watch entry. */ | |
150 | static struct audit_parent *audit_init_parent(struct nameidata *ndp) | |
151 | { | |
e9fd702a | 152 | struct inode *inode = ndp->path.dentry->d_inode; |
cfcad62c | 153 | struct audit_parent *parent; |
e9fd702a | 154 | int ret; |
cfcad62c EP |
155 | |
156 | parent = kzalloc(sizeof(*parent), GFP_KERNEL); | |
157 | if (unlikely(!parent)) | |
158 | return ERR_PTR(-ENOMEM); | |
159 | ||
160 | INIT_LIST_HEAD(&parent->watches); | |
cfcad62c | 161 | |
e9fd702a EP |
162 | fsnotify_init_mark(&parent->mark, audit_watch_free_mark); |
163 | parent->mark.mask = AUDIT_FS_WATCH; | |
40554c3d | 164 | ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, 0); |
e9fd702a | 165 | if (ret < 0) { |
ae7b8f41 | 166 | audit_free_parent(parent); |
e9fd702a | 167 | return ERR_PTR(ret); |
cfcad62c EP |
168 | } |
169 | ||
220d14df EP |
170 | fsnotify_recalc_group_mask(audit_watch_group); |
171 | ||
cfcad62c EP |
172 | return parent; |
173 | } | |
174 | ||
175 | /* Initialize a watch entry. */ | |
176 | static struct audit_watch *audit_init_watch(char *path) | |
177 | { | |
178 | struct audit_watch *watch; | |
179 | ||
180 | watch = kzalloc(sizeof(*watch), GFP_KERNEL); | |
181 | if (unlikely(!watch)) | |
182 | return ERR_PTR(-ENOMEM); | |
183 | ||
184 | INIT_LIST_HEAD(&watch->rules); | |
185 | atomic_set(&watch->count, 1); | |
186 | watch->path = path; | |
187 | watch->dev = (dev_t)-1; | |
188 | watch->ino = (unsigned long)-1; | |
189 | ||
190 | return watch; | |
191 | } | |
192 | ||
193 | /* Translate a watch string to kernel respresentation. */ | |
194 | int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op) | |
195 | { | |
196 | struct audit_watch *watch; | |
197 | ||
e9fd702a | 198 | if (!audit_watch_group) |
cfcad62c EP |
199 | return -EOPNOTSUPP; |
200 | ||
201 | if (path[0] != '/' || path[len-1] == '/' || | |
202 | krule->listnr != AUDIT_FILTER_EXIT || | |
203 | op != Audit_equal || | |
204 | krule->inode_f || krule->watch || krule->tree) | |
205 | return -EINVAL; | |
206 | ||
207 | watch = audit_init_watch(path); | |
208 | if (IS_ERR(watch)) | |
209 | return PTR_ERR(watch); | |
210 | ||
211 | audit_get_watch(watch); | |
212 | krule->watch = watch; | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | /* Duplicate the given audit watch. The new watch's rules list is initialized | |
218 | * to an empty list and wlist is undefined. */ | |
219 | static struct audit_watch *audit_dupe_watch(struct audit_watch *old) | |
220 | { | |
221 | char *path; | |
222 | struct audit_watch *new; | |
223 | ||
224 | path = kstrdup(old->path, GFP_KERNEL); | |
225 | if (unlikely(!path)) | |
226 | return ERR_PTR(-ENOMEM); | |
227 | ||
228 | new = audit_init_watch(path); | |
229 | if (IS_ERR(new)) { | |
230 | kfree(path); | |
231 | goto out; | |
232 | } | |
233 | ||
234 | new->dev = old->dev; | |
235 | new->ino = old->ino; | |
e9fd702a | 236 | audit_get_parent(old->parent); |
cfcad62c EP |
237 | new->parent = old->parent; |
238 | ||
239 | out: | |
240 | return new; | |
241 | } | |
242 | ||
243 | static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op) | |
244 | { | |
245 | if (audit_enabled) { | |
246 | struct audit_buffer *ab; | |
247 | ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE); | |
248 | audit_log_format(ab, "auid=%u ses=%u op=", | |
249 | audit_get_loginuid(current), | |
250 | audit_get_sessionid(current)); | |
251 | audit_log_string(ab, op); | |
252 | audit_log_format(ab, " path="); | |
253 | audit_log_untrustedstring(ab, w->path); | |
9d960985 | 254 | audit_log_key(ab, r->filterkey); |
cfcad62c EP |
255 | audit_log_format(ab, " list=%d res=1", r->listnr); |
256 | audit_log_end(ab); | |
257 | } | |
258 | } | |
259 | ||
260 | /* Update inode info in audit rules based on filesystem event. */ | |
261 | static void audit_update_watch(struct audit_parent *parent, | |
262 | const char *dname, dev_t dev, | |
263 | unsigned long ino, unsigned invalidating) | |
264 | { | |
265 | struct audit_watch *owatch, *nwatch, *nextw; | |
266 | struct audit_krule *r, *nextr; | |
267 | struct audit_entry *oentry, *nentry; | |
268 | ||
269 | mutex_lock(&audit_filter_mutex); | |
ae7b8f41 EP |
270 | /* Run all of the watches on this parent looking for the one that |
271 | * matches the given dname */ | |
cfcad62c EP |
272 | list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) { |
273 | if (audit_compare_dname_path(dname, owatch->path, NULL)) | |
274 | continue; | |
275 | ||
276 | /* If the update involves invalidating rules, do the inode-based | |
277 | * filtering now, so we don't omit records. */ | |
ae7b8f41 | 278 | if (invalidating && !audit_dummy_context()) |
cfcad62c EP |
279 | audit_filter_inodes(current, current->audit_context); |
280 | ||
ae7b8f41 EP |
281 | /* updating ino will likely change which audit_hash_list we |
282 | * are on so we need a new watch for the new list */ | |
cfcad62c EP |
283 | nwatch = audit_dupe_watch(owatch); |
284 | if (IS_ERR(nwatch)) { | |
285 | mutex_unlock(&audit_filter_mutex); | |
286 | audit_panic("error updating watch, skipping"); | |
287 | return; | |
288 | } | |
289 | nwatch->dev = dev; | |
290 | nwatch->ino = ino; | |
291 | ||
292 | list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) { | |
293 | ||
294 | oentry = container_of(r, struct audit_entry, rule); | |
295 | list_del(&oentry->rule.rlist); | |
296 | list_del_rcu(&oentry->list); | |
297 | ||
ae7b8f41 | 298 | nentry = audit_dupe_rule(&oentry->rule); |
cfcad62c EP |
299 | if (IS_ERR(nentry)) { |
300 | list_del(&oentry->rule.list); | |
301 | audit_panic("error updating watch, removing"); | |
302 | } else { | |
303 | int h = audit_hash_ino((u32)ino); | |
ae7b8f41 EP |
304 | |
305 | /* | |
306 | * nentry->rule.watch == oentry->rule.watch so | |
307 | * we must drop that reference and set it to our | |
308 | * new watch. | |
309 | */ | |
310 | audit_put_watch(nentry->rule.watch); | |
311 | audit_get_watch(nwatch); | |
312 | nentry->rule.watch = nwatch; | |
cfcad62c EP |
313 | list_add(&nentry->rule.rlist, &nwatch->rules); |
314 | list_add_rcu(&nentry->list, &audit_inode_hash[h]); | |
315 | list_replace(&oentry->rule.list, | |
316 | &nentry->rule.list); | |
317 | } | |
318 | ||
319 | audit_watch_log_rule_change(r, owatch, "updated rules"); | |
320 | ||
321 | call_rcu(&oentry->rcu, audit_free_rule_rcu); | |
322 | } | |
323 | ||
324 | audit_remove_watch(owatch); | |
325 | goto add_watch_to_parent; /* event applies to a single watch */ | |
326 | } | |
327 | mutex_unlock(&audit_filter_mutex); | |
328 | return; | |
329 | ||
330 | add_watch_to_parent: | |
331 | list_add(&nwatch->wlist, &parent->watches); | |
332 | mutex_unlock(&audit_filter_mutex); | |
333 | return; | |
334 | } | |
335 | ||
336 | /* Remove all watches & rules associated with a parent that is going away. */ | |
337 | static void audit_remove_parent_watches(struct audit_parent *parent) | |
338 | { | |
339 | struct audit_watch *w, *nextw; | |
340 | struct audit_krule *r, *nextr; | |
341 | struct audit_entry *e; | |
342 | ||
343 | mutex_lock(&audit_filter_mutex); | |
cfcad62c EP |
344 | list_for_each_entry_safe(w, nextw, &parent->watches, wlist) { |
345 | list_for_each_entry_safe(r, nextr, &w->rules, rlist) { | |
346 | e = container_of(r, struct audit_entry, rule); | |
347 | audit_watch_log_rule_change(r, w, "remove rule"); | |
348 | list_del(&r->rlist); | |
349 | list_del(&r->list); | |
350 | list_del_rcu(&e->list); | |
351 | call_rcu(&e->rcu, audit_free_rule_rcu); | |
352 | } | |
353 | audit_remove_watch(w); | |
354 | } | |
355 | mutex_unlock(&audit_filter_mutex); | |
e9fd702a EP |
356 | |
357 | fsnotify_destroy_mark_by_entry(&parent->mark); | |
220d14df EP |
358 | |
359 | fsnotify_recalc_group_mask(audit_watch_group); | |
360 | ||
cfcad62c EP |
361 | } |
362 | ||
cfcad62c | 363 | /* Get path information necessary for adding watches. */ |
35fe4d0b | 364 | static int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw) |
cfcad62c EP |
365 | { |
366 | struct nameidata *ndparent, *ndwatch; | |
367 | int err; | |
368 | ||
369 | ndparent = kmalloc(sizeof(*ndparent), GFP_KERNEL); | |
370 | if (unlikely(!ndparent)) | |
371 | return -ENOMEM; | |
372 | ||
373 | ndwatch = kmalloc(sizeof(*ndwatch), GFP_KERNEL); | |
374 | if (unlikely(!ndwatch)) { | |
375 | kfree(ndparent); | |
376 | return -ENOMEM; | |
377 | } | |
378 | ||
379 | err = path_lookup(path, LOOKUP_PARENT, ndparent); | |
380 | if (err) { | |
381 | kfree(ndparent); | |
382 | kfree(ndwatch); | |
383 | return err; | |
384 | } | |
385 | ||
386 | err = path_lookup(path, 0, ndwatch); | |
387 | if (err) { | |
388 | kfree(ndwatch); | |
389 | ndwatch = NULL; | |
390 | } | |
391 | ||
392 | *ndp = ndparent; | |
393 | *ndw = ndwatch; | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | /* Release resources used for watch path information. */ | |
35fe4d0b | 399 | static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw) |
cfcad62c EP |
400 | { |
401 | if (ndp) { | |
402 | path_put(&ndp->path); | |
403 | kfree(ndp); | |
404 | } | |
405 | if (ndw) { | |
406 | path_put(&ndw->path); | |
407 | kfree(ndw); | |
408 | } | |
409 | } | |
410 | ||
e9fd702a | 411 | /* Associate the given rule with an existing parent. |
cfcad62c EP |
412 | * Caller must hold audit_filter_mutex. */ |
413 | static void audit_add_to_parent(struct audit_krule *krule, | |
414 | struct audit_parent *parent) | |
415 | { | |
416 | struct audit_watch *w, *watch = krule->watch; | |
417 | int watch_found = 0; | |
418 | ||
e9fd702a EP |
419 | BUG_ON(!mutex_is_locked(&audit_filter_mutex)); |
420 | ||
cfcad62c EP |
421 | list_for_each_entry(w, &parent->watches, wlist) { |
422 | if (strcmp(watch->path, w->path)) | |
423 | continue; | |
424 | ||
425 | watch_found = 1; | |
426 | ||
427 | /* put krule's and initial refs to temporary watch */ | |
428 | audit_put_watch(watch); | |
429 | audit_put_watch(watch); | |
430 | ||
431 | audit_get_watch(w); | |
432 | krule->watch = watch = w; | |
433 | break; | |
434 | } | |
435 | ||
436 | if (!watch_found) { | |
e9fd702a | 437 | audit_get_parent(parent); |
cfcad62c EP |
438 | watch->parent = parent; |
439 | ||
440 | list_add(&watch->wlist, &parent->watches); | |
441 | } | |
442 | list_add(&krule->rlist, &watch->rules); | |
443 | } | |
444 | ||
445 | /* Find a matching watch entry, or add this one. | |
446 | * Caller must hold audit_filter_mutex. */ | |
ae7b8f41 | 447 | int audit_add_watch(struct audit_krule *krule, struct list_head **list) |
cfcad62c EP |
448 | { |
449 | struct audit_watch *watch = krule->watch; | |
cfcad62c | 450 | struct audit_parent *parent; |
35fe4d0b | 451 | struct nameidata *ndp = NULL, *ndw = NULL; |
ae7b8f41 | 452 | int h, ret = 0; |
cfcad62c | 453 | |
35fe4d0b EP |
454 | mutex_unlock(&audit_filter_mutex); |
455 | ||
456 | /* Avoid calling path_lookup under audit_filter_mutex. */ | |
457 | ret = audit_get_nd(watch->path, &ndp, &ndw); | |
458 | if (ret) { | |
459 | /* caller expects mutex locked */ | |
460 | mutex_lock(&audit_filter_mutex); | |
461 | goto error; | |
462 | } | |
463 | ||
e118e9c5 EP |
464 | mutex_lock(&audit_filter_mutex); |
465 | ||
cfcad62c EP |
466 | /* update watch filter fields */ |
467 | if (ndw) { | |
468 | watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev; | |
469 | watch->ino = ndw->path.dentry->d_inode->i_ino; | |
470 | } | |
471 | ||
e118e9c5 | 472 | /* either find an old parent or attach a new one */ |
e9fd702a EP |
473 | parent = audit_find_parent(ndp->path.dentry->d_inode); |
474 | if (!parent) { | |
cfcad62c EP |
475 | parent = audit_init_parent(ndp); |
476 | if (IS_ERR(parent)) { | |
35fe4d0b EP |
477 | ret = PTR_ERR(parent); |
478 | goto error; | |
cfcad62c | 479 | } |
e9fd702a | 480 | } |
cfcad62c | 481 | |
e118e9c5 | 482 | audit_add_to_parent(krule, parent); |
cfcad62c | 483 | |
e9fd702a EP |
484 | /* match get in audit_find_parent or audit_init_parent */ |
485 | audit_put_parent(parent); | |
35fe4d0b | 486 | |
ae7b8f41 EP |
487 | h = audit_hash_ino((u32)watch->ino); |
488 | *list = &audit_inode_hash[h]; | |
35fe4d0b EP |
489 | error: |
490 | audit_put_nd(ndp, ndw); /* NULL args OK */ | |
cfcad62c | 491 | return ret; |
35fe4d0b | 492 | |
cfcad62c EP |
493 | } |
494 | ||
a05fb6cc | 495 | void audit_remove_watch_rule(struct audit_krule *krule) |
cfcad62c EP |
496 | { |
497 | struct audit_watch *watch = krule->watch; | |
498 | struct audit_parent *parent = watch->parent; | |
499 | ||
500 | list_del(&krule->rlist); | |
501 | ||
502 | if (list_empty(&watch->rules)) { | |
503 | audit_remove_watch(watch); | |
504 | ||
505 | if (list_empty(&parent->watches)) { | |
e9fd702a | 506 | audit_get_parent(parent); |
a05fb6cc EP |
507 | fsnotify_destroy_mark_by_entry(&parent->mark); |
508 | audit_put_parent(parent); | |
cfcad62c EP |
509 | } |
510 | } | |
220d14df EP |
511 | |
512 | fsnotify_recalc_group_mask(audit_watch_group); | |
513 | ||
cfcad62c EP |
514 | } |
515 | ||
7b0a04fb | 516 | static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode, |
3a9fb89f EP |
517 | struct vfsmount *mnt, __u32 mask, void *data, |
518 | int data_type) | |
cfcad62c | 519 | { |
e61ce867 | 520 | struct fsnotify_mark *entry; |
e9fd702a EP |
521 | bool send; |
522 | ||
523 | spin_lock(&inode->i_lock); | |
524 | entry = fsnotify_find_mark_entry(group, inode); | |
525 | spin_unlock(&inode->i_lock); | |
526 | if (!entry) | |
527 | return false; | |
528 | ||
529 | mask = (mask & ~FS_EVENT_ON_CHILD); | |
530 | send = (entry->mask & mask); | |
531 | ||
532 | /* find took a reference */ | |
533 | fsnotify_put_mark(entry); | |
534 | ||
535 | return send; | |
536 | } | |
537 | ||
538 | /* Update watch data in audit rules based on fsnotify events. */ | |
539 | static int audit_watch_handle_event(struct fsnotify_group *group, struct fsnotify_event *event) | |
540 | { | |
541 | struct inode *inode; | |
542 | __u32 mask = event->mask; | |
543 | const char *dname = event->file_name; | |
cfcad62c EP |
544 | struct audit_parent *parent; |
545 | ||
e9fd702a EP |
546 | BUG_ON(group != audit_watch_group); |
547 | ||
548 | parent = audit_find_parent(event->to_tell); | |
549 | if (unlikely(!parent)) | |
550 | return 0; | |
551 | ||
552 | switch (event->data_type) { | |
553 | case (FSNOTIFY_EVENT_PATH): | |
554 | inode = event->path.dentry->d_inode; | |
555 | break; | |
556 | case (FSNOTIFY_EVENT_INODE): | |
557 | inode = event->inode; | |
558 | break; | |
559 | default: | |
560 | BUG(); | |
561 | inode = NULL; | |
562 | break; | |
563 | }; | |
cfcad62c | 564 | |
e9fd702a | 565 | if (mask & (FS_CREATE|FS_MOVED_TO) && inode) |
ae7b8f41 | 566 | audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0); |
e9fd702a | 567 | else if (mask & (FS_DELETE|FS_MOVED_FROM)) |
cfcad62c | 568 | audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1); |
e9fd702a | 569 | else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF)) |
cfcad62c | 570 | audit_remove_parent_watches(parent); |
e9fd702a EP |
571 | /* moved put_inotify_watch to freeing mark */ |
572 | ||
573 | /* matched the ref taken by audit_find_parent */ | |
574 | audit_put_parent(parent); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
e9fd702a EP |
579 | static const struct fsnotify_ops audit_watch_fsnotify_ops = { |
580 | .should_send_event = audit_watch_should_send_event, | |
581 | .handle_event = audit_watch_handle_event, | |
582 | .free_group_priv = NULL, | |
e118e9c5 | 583 | .freeing_mark = NULL, |
e9fd702a | 584 | .free_event_priv = NULL, |
cfcad62c EP |
585 | }; |
586 | ||
587 | static int __init audit_watch_init(void) | |
588 | { | |
0d2e2a1d | 589 | audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops); |
e9fd702a EP |
590 | if (IS_ERR(audit_watch_group)) { |
591 | audit_watch_group = NULL; | |
592 | audit_panic("cannot create audit fsnotify group"); | |
593 | } | |
cfcad62c EP |
594 | return 0; |
595 | } | |
1a3aedbc | 596 | device_initcall(audit_watch_init); |