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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 EP |
58 | struct list_head ilist; /* tmp list used to free parents */ |
59 | struct list_head watches; /* anchor for audit_watch->wlist */ | |
e9fd702a | 60 | struct fsnotify_mark_entry mark; /* fsnotify mark on the inode */ |
cfcad62c EP |
61 | }; |
62 | ||
e9fd702a EP |
63 | /* fsnotify handle. */ |
64 | struct fsnotify_group *audit_watch_group; | |
cfcad62c | 65 | |
e9fd702a EP |
66 | /* fsnotify events we care about. */ |
67 | #define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\ | |
68 | FS_MOVE_SELF | FS_EVENT_ON_CHILD) | |
cfcad62c | 69 | |
ae7b8f41 EP |
70 | static void audit_free_parent(struct audit_parent *parent) |
71 | { | |
72 | WARN_ON(!list_empty(&parent->watches)); | |
73 | kfree(parent); | |
74 | } | |
75 | ||
e9fd702a | 76 | static void audit_watch_free_mark(struct fsnotify_mark_entry *entry) |
cfcad62c EP |
77 | { |
78 | struct audit_parent *parent; | |
79 | ||
e9fd702a | 80 | parent = container_of(entry, struct audit_parent, mark); |
ae7b8f41 | 81 | audit_free_parent(parent); |
cfcad62c EP |
82 | } |
83 | ||
e9fd702a EP |
84 | static void audit_get_parent(struct audit_parent *parent) |
85 | { | |
86 | if (likely(parent)) | |
87 | fsnotify_get_mark(&parent->mark); | |
88 | } | |
89 | ||
90 | static void audit_put_parent(struct audit_parent *parent) | |
91 | { | |
92 | if (likely(parent)) | |
93 | fsnotify_put_mark(&parent->mark); | |
94 | } | |
95 | ||
96 | /* | |
97 | * Find and return the audit_parent on the given inode. If found a reference | |
98 | * is taken on this parent. | |
99 | */ | |
100 | static inline struct audit_parent *audit_find_parent(struct inode *inode) | |
101 | { | |
102 | struct audit_parent *parent = NULL; | |
103 | struct fsnotify_mark_entry *entry; | |
104 | ||
105 | spin_lock(&inode->i_lock); | |
106 | entry = fsnotify_find_mark_entry(audit_watch_group, inode); | |
107 | spin_unlock(&inode->i_lock); | |
108 | ||
109 | if (entry) | |
110 | parent = container_of(entry, struct audit_parent, mark); | |
111 | ||
112 | return parent; | |
113 | } | |
114 | ||
cfcad62c EP |
115 | void audit_get_watch(struct audit_watch *watch) |
116 | { | |
117 | atomic_inc(&watch->count); | |
118 | } | |
119 | ||
120 | void audit_put_watch(struct audit_watch *watch) | |
121 | { | |
122 | if (atomic_dec_and_test(&watch->count)) { | |
123 | WARN_ON(watch->parent); | |
124 | WARN_ON(!list_empty(&watch->rules)); | |
125 | kfree(watch->path); | |
126 | kfree(watch); | |
127 | } | |
128 | } | |
129 | ||
130 | void audit_remove_watch(struct audit_watch *watch) | |
131 | { | |
132 | list_del(&watch->wlist); | |
e9fd702a | 133 | audit_put_parent(watch->parent); |
cfcad62c EP |
134 | watch->parent = NULL; |
135 | audit_put_watch(watch); /* match initial get */ | |
136 | } | |
137 | ||
138 | char *audit_watch_path(struct audit_watch *watch) | |
139 | { | |
140 | return watch->path; | |
141 | } | |
142 | ||
ae7b8f41 | 143 | int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev) |
cfcad62c | 144 | { |
ae7b8f41 EP |
145 | return (watch->ino != (unsigned long)-1) && |
146 | (watch->ino == ino) && | |
147 | (watch->dev == dev); | |
cfcad62c EP |
148 | } |
149 | ||
150 | /* Initialize a parent watch entry. */ | |
151 | static struct audit_parent *audit_init_parent(struct nameidata *ndp) | |
152 | { | |
e9fd702a | 153 | struct inode *inode = ndp->path.dentry->d_inode; |
cfcad62c | 154 | struct audit_parent *parent; |
e9fd702a | 155 | int ret; |
cfcad62c EP |
156 | |
157 | parent = kzalloc(sizeof(*parent), GFP_KERNEL); | |
158 | if (unlikely(!parent)) | |
159 | return ERR_PTR(-ENOMEM); | |
160 | ||
161 | INIT_LIST_HEAD(&parent->watches); | |
cfcad62c | 162 | |
e9fd702a EP |
163 | fsnotify_init_mark(&parent->mark, audit_watch_free_mark); |
164 | parent->mark.mask = AUDIT_FS_WATCH; | |
e9fd702a EP |
165 | ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode); |
166 | if (ret < 0) { | |
ae7b8f41 | 167 | audit_free_parent(parent); |
e9fd702a | 168 | return ERR_PTR(ret); |
cfcad62c EP |
169 | } |
170 | ||
171 | return parent; | |
172 | } | |
173 | ||
174 | /* Initialize a watch entry. */ | |
175 | static struct audit_watch *audit_init_watch(char *path) | |
176 | { | |
177 | struct audit_watch *watch; | |
178 | ||
179 | watch = kzalloc(sizeof(*watch), GFP_KERNEL); | |
180 | if (unlikely(!watch)) | |
181 | return ERR_PTR(-ENOMEM); | |
182 | ||
183 | INIT_LIST_HEAD(&watch->rules); | |
184 | atomic_set(&watch->count, 1); | |
185 | watch->path = path; | |
186 | watch->dev = (dev_t)-1; | |
187 | watch->ino = (unsigned long)-1; | |
188 | ||
189 | return watch; | |
190 | } | |
191 | ||
192 | /* Translate a watch string to kernel respresentation. */ | |
193 | int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op) | |
194 | { | |
195 | struct audit_watch *watch; | |
196 | ||
e9fd702a | 197 | if (!audit_watch_group) |
cfcad62c EP |
198 | return -EOPNOTSUPP; |
199 | ||
200 | if (path[0] != '/' || path[len-1] == '/' || | |
201 | krule->listnr != AUDIT_FILTER_EXIT || | |
202 | op != Audit_equal || | |
203 | krule->inode_f || krule->watch || krule->tree) | |
204 | return -EINVAL; | |
205 | ||
206 | watch = audit_init_watch(path); | |
207 | if (IS_ERR(watch)) | |
208 | return PTR_ERR(watch); | |
209 | ||
210 | audit_get_watch(watch); | |
211 | krule->watch = watch; | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | /* Duplicate the given audit watch. The new watch's rules list is initialized | |
217 | * to an empty list and wlist is undefined. */ | |
218 | static struct audit_watch *audit_dupe_watch(struct audit_watch *old) | |
219 | { | |
220 | char *path; | |
221 | struct audit_watch *new; | |
222 | ||
223 | path = kstrdup(old->path, GFP_KERNEL); | |
224 | if (unlikely(!path)) | |
225 | return ERR_PTR(-ENOMEM); | |
226 | ||
227 | new = audit_init_watch(path); | |
228 | if (IS_ERR(new)) { | |
229 | kfree(path); | |
230 | goto out; | |
231 | } | |
232 | ||
233 | new->dev = old->dev; | |
234 | new->ino = old->ino; | |
e9fd702a | 235 | audit_get_parent(old->parent); |
cfcad62c EP |
236 | new->parent = old->parent; |
237 | ||
238 | out: | |
239 | return new; | |
240 | } | |
241 | ||
242 | static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op) | |
243 | { | |
244 | if (audit_enabled) { | |
245 | struct audit_buffer *ab; | |
246 | ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE); | |
247 | audit_log_format(ab, "auid=%u ses=%u op=", | |
248 | audit_get_loginuid(current), | |
249 | audit_get_sessionid(current)); | |
250 | audit_log_string(ab, op); | |
251 | audit_log_format(ab, " path="); | |
252 | audit_log_untrustedstring(ab, w->path); | |
9d960985 | 253 | audit_log_key(ab, r->filterkey); |
cfcad62c EP |
254 | audit_log_format(ab, " list=%d res=1", r->listnr); |
255 | audit_log_end(ab); | |
256 | } | |
257 | } | |
258 | ||
259 | /* Update inode info in audit rules based on filesystem event. */ | |
260 | static void audit_update_watch(struct audit_parent *parent, | |
261 | const char *dname, dev_t dev, | |
262 | unsigned long ino, unsigned invalidating) | |
263 | { | |
264 | struct audit_watch *owatch, *nwatch, *nextw; | |
265 | struct audit_krule *r, *nextr; | |
266 | struct audit_entry *oentry, *nentry; | |
267 | ||
268 | mutex_lock(&audit_filter_mutex); | |
ae7b8f41 EP |
269 | /* Run all of the watches on this parent looking for the one that |
270 | * matches the given dname */ | |
cfcad62c EP |
271 | list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) { |
272 | if (audit_compare_dname_path(dname, owatch->path, NULL)) | |
273 | continue; | |
274 | ||
275 | /* If the update involves invalidating rules, do the inode-based | |
276 | * filtering now, so we don't omit records. */ | |
ae7b8f41 | 277 | if (invalidating && !audit_dummy_context()) |
cfcad62c EP |
278 | audit_filter_inodes(current, current->audit_context); |
279 | ||
ae7b8f41 EP |
280 | /* updating ino will likely change which audit_hash_list we |
281 | * are on so we need a new watch for the new list */ | |
cfcad62c EP |
282 | nwatch = audit_dupe_watch(owatch); |
283 | if (IS_ERR(nwatch)) { | |
284 | mutex_unlock(&audit_filter_mutex); | |
285 | audit_panic("error updating watch, skipping"); | |
286 | return; | |
287 | } | |
288 | nwatch->dev = dev; | |
289 | nwatch->ino = ino; | |
290 | ||
291 | list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) { | |
292 | ||
293 | oentry = container_of(r, struct audit_entry, rule); | |
294 | list_del(&oentry->rule.rlist); | |
295 | list_del_rcu(&oentry->list); | |
296 | ||
ae7b8f41 | 297 | nentry = audit_dupe_rule(&oentry->rule); |
cfcad62c EP |
298 | if (IS_ERR(nentry)) { |
299 | list_del(&oentry->rule.list); | |
300 | audit_panic("error updating watch, removing"); | |
301 | } else { | |
302 | int h = audit_hash_ino((u32)ino); | |
ae7b8f41 EP |
303 | |
304 | /* | |
305 | * nentry->rule.watch == oentry->rule.watch so | |
306 | * we must drop that reference and set it to our | |
307 | * new watch. | |
308 | */ | |
309 | audit_put_watch(nentry->rule.watch); | |
310 | audit_get_watch(nwatch); | |
311 | nentry->rule.watch = nwatch; | |
cfcad62c EP |
312 | list_add(&nentry->rule.rlist, &nwatch->rules); |
313 | list_add_rcu(&nentry->list, &audit_inode_hash[h]); | |
314 | list_replace(&oentry->rule.list, | |
315 | &nentry->rule.list); | |
316 | } | |
317 | ||
318 | audit_watch_log_rule_change(r, owatch, "updated rules"); | |
319 | ||
320 | call_rcu(&oentry->rcu, audit_free_rule_rcu); | |
321 | } | |
322 | ||
323 | audit_remove_watch(owatch); | |
324 | goto add_watch_to_parent; /* event applies to a single watch */ | |
325 | } | |
326 | mutex_unlock(&audit_filter_mutex); | |
327 | return; | |
328 | ||
329 | add_watch_to_parent: | |
330 | list_add(&nwatch->wlist, &parent->watches); | |
331 | mutex_unlock(&audit_filter_mutex); | |
332 | return; | |
333 | } | |
334 | ||
335 | /* Remove all watches & rules associated with a parent that is going away. */ | |
336 | static void audit_remove_parent_watches(struct audit_parent *parent) | |
337 | { | |
338 | struct audit_watch *w, *nextw; | |
339 | struct audit_krule *r, *nextr; | |
340 | struct audit_entry *e; | |
341 | ||
342 | mutex_lock(&audit_filter_mutex); | |
cfcad62c EP |
343 | list_for_each_entry_safe(w, nextw, &parent->watches, wlist) { |
344 | list_for_each_entry_safe(r, nextr, &w->rules, rlist) { | |
345 | e = container_of(r, struct audit_entry, rule); | |
346 | audit_watch_log_rule_change(r, w, "remove rule"); | |
347 | list_del(&r->rlist); | |
348 | list_del(&r->list); | |
349 | list_del_rcu(&e->list); | |
350 | call_rcu(&e->rcu, audit_free_rule_rcu); | |
351 | } | |
352 | audit_remove_watch(w); | |
353 | } | |
354 | mutex_unlock(&audit_filter_mutex); | |
e9fd702a EP |
355 | |
356 | fsnotify_destroy_mark_by_entry(&parent->mark); | |
cfcad62c EP |
357 | } |
358 | ||
359 | /* Unregister inotify watches for parents on in_list. | |
e9fd702a | 360 | * Generates an FS_IGNORED event. */ |
ae7b8f41 | 361 | void audit_watch_inotify_unregister(struct list_head *in_list) |
cfcad62c EP |
362 | { |
363 | struct audit_parent *p, *n; | |
364 | ||
365 | list_for_each_entry_safe(p, n, in_list, ilist) { | |
366 | list_del(&p->ilist); | |
e9fd702a EP |
367 | fsnotify_destroy_mark_by_entry(&p->mark); |
368 | /* matches the get in audit_remove_watch_rule() */ | |
369 | audit_put_parent(p); | |
cfcad62c EP |
370 | } |
371 | } | |
372 | ||
373 | /* Get path information necessary for adding watches. */ | |
35fe4d0b | 374 | static int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw) |
cfcad62c EP |
375 | { |
376 | struct nameidata *ndparent, *ndwatch; | |
377 | int err; | |
378 | ||
379 | ndparent = kmalloc(sizeof(*ndparent), GFP_KERNEL); | |
380 | if (unlikely(!ndparent)) | |
381 | return -ENOMEM; | |
382 | ||
383 | ndwatch = kmalloc(sizeof(*ndwatch), GFP_KERNEL); | |
384 | if (unlikely(!ndwatch)) { | |
385 | kfree(ndparent); | |
386 | return -ENOMEM; | |
387 | } | |
388 | ||
389 | err = path_lookup(path, LOOKUP_PARENT, ndparent); | |
390 | if (err) { | |
391 | kfree(ndparent); | |
392 | kfree(ndwatch); | |
393 | return err; | |
394 | } | |
395 | ||
396 | err = path_lookup(path, 0, ndwatch); | |
397 | if (err) { | |
398 | kfree(ndwatch); | |
399 | ndwatch = NULL; | |
400 | } | |
401 | ||
402 | *ndp = ndparent; | |
403 | *ndw = ndwatch; | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | /* Release resources used for watch path information. */ | |
35fe4d0b | 409 | static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw) |
cfcad62c EP |
410 | { |
411 | if (ndp) { | |
412 | path_put(&ndp->path); | |
413 | kfree(ndp); | |
414 | } | |
415 | if (ndw) { | |
416 | path_put(&ndw->path); | |
417 | kfree(ndw); | |
418 | } | |
419 | } | |
420 | ||
e9fd702a | 421 | /* Associate the given rule with an existing parent. |
cfcad62c EP |
422 | * Caller must hold audit_filter_mutex. */ |
423 | static void audit_add_to_parent(struct audit_krule *krule, | |
424 | struct audit_parent *parent) | |
425 | { | |
426 | struct audit_watch *w, *watch = krule->watch; | |
427 | int watch_found = 0; | |
428 | ||
e9fd702a EP |
429 | BUG_ON(!mutex_is_locked(&audit_filter_mutex)); |
430 | ||
cfcad62c EP |
431 | list_for_each_entry(w, &parent->watches, wlist) { |
432 | if (strcmp(watch->path, w->path)) | |
433 | continue; | |
434 | ||
435 | watch_found = 1; | |
436 | ||
437 | /* put krule's and initial refs to temporary watch */ | |
438 | audit_put_watch(watch); | |
439 | audit_put_watch(watch); | |
440 | ||
441 | audit_get_watch(w); | |
442 | krule->watch = watch = w; | |
443 | break; | |
444 | } | |
445 | ||
446 | if (!watch_found) { | |
e9fd702a | 447 | audit_get_parent(parent); |
cfcad62c EP |
448 | watch->parent = parent; |
449 | ||
450 | list_add(&watch->wlist, &parent->watches); | |
451 | } | |
452 | list_add(&krule->rlist, &watch->rules); | |
453 | } | |
454 | ||
455 | /* Find a matching watch entry, or add this one. | |
456 | * Caller must hold audit_filter_mutex. */ | |
ae7b8f41 | 457 | int audit_add_watch(struct audit_krule *krule, struct list_head **list) |
cfcad62c EP |
458 | { |
459 | struct audit_watch *watch = krule->watch; | |
cfcad62c | 460 | struct audit_parent *parent; |
35fe4d0b | 461 | struct nameidata *ndp = NULL, *ndw = NULL; |
ae7b8f41 | 462 | int h, ret = 0; |
cfcad62c | 463 | |
35fe4d0b EP |
464 | mutex_unlock(&audit_filter_mutex); |
465 | ||
466 | /* Avoid calling path_lookup under audit_filter_mutex. */ | |
467 | ret = audit_get_nd(watch->path, &ndp, &ndw); | |
468 | if (ret) { | |
469 | /* caller expects mutex locked */ | |
470 | mutex_lock(&audit_filter_mutex); | |
471 | goto error; | |
472 | } | |
473 | ||
e118e9c5 EP |
474 | mutex_lock(&audit_filter_mutex); |
475 | ||
cfcad62c EP |
476 | /* update watch filter fields */ |
477 | if (ndw) { | |
478 | watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev; | |
479 | watch->ino = ndw->path.dentry->d_inode->i_ino; | |
480 | } | |
481 | ||
e118e9c5 | 482 | /* either find an old parent or attach a new one */ |
e9fd702a EP |
483 | parent = audit_find_parent(ndp->path.dentry->d_inode); |
484 | if (!parent) { | |
cfcad62c EP |
485 | parent = audit_init_parent(ndp); |
486 | if (IS_ERR(parent)) { | |
35fe4d0b EP |
487 | ret = PTR_ERR(parent); |
488 | goto error; | |
cfcad62c | 489 | } |
e9fd702a | 490 | } |
cfcad62c | 491 | |
e118e9c5 | 492 | audit_add_to_parent(krule, parent); |
cfcad62c | 493 | |
e9fd702a EP |
494 | /* match get in audit_find_parent or audit_init_parent */ |
495 | audit_put_parent(parent); | |
35fe4d0b | 496 | |
ae7b8f41 EP |
497 | h = audit_hash_ino((u32)watch->ino); |
498 | *list = &audit_inode_hash[h]; | |
35fe4d0b EP |
499 | error: |
500 | audit_put_nd(ndp, ndw); /* NULL args OK */ | |
cfcad62c | 501 | return ret; |
35fe4d0b | 502 | |
cfcad62c EP |
503 | } |
504 | ||
505 | void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list) | |
506 | { | |
507 | struct audit_watch *watch = krule->watch; | |
508 | struct audit_parent *parent = watch->parent; | |
509 | ||
510 | list_del(&krule->rlist); | |
511 | ||
512 | if (list_empty(&watch->rules)) { | |
513 | audit_remove_watch(watch); | |
514 | ||
515 | if (list_empty(&parent->watches)) { | |
e9fd702a EP |
516 | /* Put parent on the un-registration list. |
517 | * Grab a reference before releasing | |
cfcad62c | 518 | * audit_filter_mutex, to be released in |
e9fd702a | 519 | * audit_watch_inotify_unregister(). |
cfcad62c EP |
520 | * If filesystem is going away, just leave |
521 | * the sucker alone, eviction will take | |
522 | * care of it. */ | |
e9fd702a EP |
523 | audit_get_parent(parent); |
524 | list_add(&parent->ilist, list); | |
cfcad62c EP |
525 | } |
526 | } | |
527 | } | |
528 | ||
e9fd702a | 529 | static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode, __u32 mask) |
cfcad62c | 530 | { |
e9fd702a EP |
531 | struct fsnotify_mark_entry *entry; |
532 | bool send; | |
533 | ||
534 | spin_lock(&inode->i_lock); | |
535 | entry = fsnotify_find_mark_entry(group, inode); | |
536 | spin_unlock(&inode->i_lock); | |
537 | if (!entry) | |
538 | return false; | |
539 | ||
540 | mask = (mask & ~FS_EVENT_ON_CHILD); | |
541 | send = (entry->mask & mask); | |
542 | ||
543 | /* find took a reference */ | |
544 | fsnotify_put_mark(entry); | |
545 | ||
546 | return send; | |
547 | } | |
548 | ||
549 | /* Update watch data in audit rules based on fsnotify events. */ | |
550 | static int audit_watch_handle_event(struct fsnotify_group *group, struct fsnotify_event *event) | |
551 | { | |
552 | struct inode *inode; | |
553 | __u32 mask = event->mask; | |
554 | const char *dname = event->file_name; | |
cfcad62c EP |
555 | struct audit_parent *parent; |
556 | ||
e9fd702a EP |
557 | BUG_ON(group != audit_watch_group); |
558 | ||
559 | parent = audit_find_parent(event->to_tell); | |
560 | if (unlikely(!parent)) | |
561 | return 0; | |
562 | ||
563 | switch (event->data_type) { | |
564 | case (FSNOTIFY_EVENT_PATH): | |
565 | inode = event->path.dentry->d_inode; | |
566 | break; | |
567 | case (FSNOTIFY_EVENT_INODE): | |
568 | inode = event->inode; | |
569 | break; | |
570 | default: | |
571 | BUG(); | |
572 | inode = NULL; | |
573 | break; | |
574 | }; | |
cfcad62c | 575 | |
e9fd702a | 576 | if (mask & (FS_CREATE|FS_MOVED_TO) && inode) |
ae7b8f41 | 577 | audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0); |
e9fd702a | 578 | else if (mask & (FS_DELETE|FS_MOVED_FROM)) |
cfcad62c | 579 | audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1); |
e9fd702a | 580 | else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF)) |
cfcad62c | 581 | audit_remove_parent_watches(parent); |
e9fd702a EP |
582 | /* moved put_inotify_watch to freeing mark */ |
583 | ||
584 | /* matched the ref taken by audit_find_parent */ | |
585 | audit_put_parent(parent); | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
e9fd702a EP |
590 | static const struct fsnotify_ops audit_watch_fsnotify_ops = { |
591 | .should_send_event = audit_watch_should_send_event, | |
592 | .handle_event = audit_watch_handle_event, | |
593 | .free_group_priv = NULL, | |
e118e9c5 | 594 | .freeing_mark = NULL, |
e9fd702a | 595 | .free_event_priv = NULL, |
cfcad62c EP |
596 | }; |
597 | ||
598 | static int __init audit_watch_init(void) | |
599 | { | |
e9fd702a EP |
600 | audit_watch_group = fsnotify_obtain_group(AUDIT_WATCH_GROUP_NUM, AUDIT_FS_WATCH, |
601 | &audit_watch_fsnotify_ops); | |
602 | if (IS_ERR(audit_watch_group)) { | |
603 | audit_watch_group = NULL; | |
604 | audit_panic("cannot create audit fsnotify group"); | |
605 | } | |
cfcad62c EP |
606 | return 0; |
607 | } | |
608 | subsys_initcall(audit_watch_init); |