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 | ||
5efc2443 | 22 | #include <linux/file.h> |
cfcad62c EP |
23 | #include <linux/kernel.h> |
24 | #include <linux/audit.h> | |
25 | #include <linux/kthread.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/fs.h> | |
e9fd702a | 28 | #include <linux/fsnotify_backend.h> |
cfcad62c EP |
29 | #include <linux/namei.h> |
30 | #include <linux/netlink.h> | |
31 | #include <linux/sched.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
cfcad62c EP |
33 | #include <linux/security.h> |
34 | #include "audit.h" | |
35 | ||
36 | /* | |
37 | * Reference counting: | |
38 | * | |
e9fd702a | 39 | * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED |
cfcad62c EP |
40 | * event. Each audit_watch holds a reference to its associated parent. |
41 | * | |
42 | * audit_watch: if added to lists, lifetime is from audit_init_watch() to | |
43 | * audit_remove_watch(). Additionally, an audit_watch may exist | |
44 | * temporarily to assist in searching existing filter data. Each | |
45 | * audit_krule holds a reference to its associated watch. | |
46 | */ | |
47 | ||
48 | struct audit_watch { | |
49 | atomic_t count; /* reference count */ | |
cfcad62c | 50 | dev_t dev; /* associated superblock device */ |
e08b061e | 51 | char *path; /* insertion path */ |
cfcad62c EP |
52 | unsigned long ino; /* associated inode number */ |
53 | struct audit_parent *parent; /* associated parent */ | |
54 | struct list_head wlist; /* entry in parent->watches list */ | |
ae7b8f41 | 55 | struct list_head rules; /* anchor for krule->rlist */ |
cfcad62c EP |
56 | }; |
57 | ||
58 | struct audit_parent { | |
ae7b8f41 | 59 | struct list_head watches; /* anchor for audit_watch->wlist */ |
e61ce867 | 60 | struct fsnotify_mark mark; /* fsnotify mark on the inode */ |
cfcad62c EP |
61 | }; |
62 | ||
e9fd702a | 63 | /* fsnotify handle. */ |
b8800aa5 | 64 | static 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 | ||
e61ce867 | 76 | static void audit_watch_free_mark(struct fsnotify_mark *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; | |
e61ce867 | 103 | struct fsnotify_mark *entry; |
e9fd702a | 104 | |
5444e298 | 105 | entry = fsnotify_find_inode_mark(audit_watch_group, inode); |
e9fd702a EP |
106 | if (entry) |
107 | parent = container_of(entry, struct audit_parent, mark); | |
108 | ||
109 | return parent; | |
110 | } | |
111 | ||
cfcad62c EP |
112 | void audit_get_watch(struct audit_watch *watch) |
113 | { | |
114 | atomic_inc(&watch->count); | |
115 | } | |
116 | ||
117 | void audit_put_watch(struct audit_watch *watch) | |
118 | { | |
119 | if (atomic_dec_and_test(&watch->count)) { | |
120 | WARN_ON(watch->parent); | |
121 | WARN_ON(!list_empty(&watch->rules)); | |
122 | kfree(watch->path); | |
123 | kfree(watch); | |
124 | } | |
125 | } | |
126 | ||
b8800aa5 | 127 | static void audit_remove_watch(struct audit_watch *watch) |
cfcad62c EP |
128 | { |
129 | list_del(&watch->wlist); | |
e9fd702a | 130 | audit_put_parent(watch->parent); |
cfcad62c EP |
131 | watch->parent = NULL; |
132 | audit_put_watch(watch); /* match initial get */ | |
133 | } | |
134 | ||
135 | char *audit_watch_path(struct audit_watch *watch) | |
136 | { | |
137 | return watch->path; | |
138 | } | |
139 | ||
ae7b8f41 | 140 | int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev) |
cfcad62c | 141 | { |
84cb777e | 142 | return (watch->ino != AUDIT_INO_UNSET) && |
ae7b8f41 EP |
143 | (watch->ino == ino) && |
144 | (watch->dev == dev); | |
cfcad62c EP |
145 | } |
146 | ||
147 | /* Initialize a parent watch entry. */ | |
15a9155f | 148 | static struct audit_parent *audit_init_parent(struct path *path) |
cfcad62c | 149 | { |
3b362157 | 150 | struct inode *inode = d_backing_inode(path->dentry); |
cfcad62c | 151 | struct audit_parent *parent; |
e9fd702a | 152 | int ret; |
cfcad62c EP |
153 | |
154 | parent = kzalloc(sizeof(*parent), GFP_KERNEL); | |
155 | if (unlikely(!parent)) | |
156 | return ERR_PTR(-ENOMEM); | |
157 | ||
158 | INIT_LIST_HEAD(&parent->watches); | |
cfcad62c | 159 | |
e9fd702a EP |
160 | fsnotify_init_mark(&parent->mark, audit_watch_free_mark); |
161 | parent->mark.mask = AUDIT_FS_WATCH; | |
5444e298 | 162 | ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, NULL, 0); |
e9fd702a | 163 | if (ret < 0) { |
ae7b8f41 | 164 | audit_free_parent(parent); |
e9fd702a | 165 | return ERR_PTR(ret); |
cfcad62c EP |
166 | } |
167 | ||
168 | return parent; | |
169 | } | |
170 | ||
171 | /* Initialize a watch entry. */ | |
172 | static struct audit_watch *audit_init_watch(char *path) | |
173 | { | |
174 | struct audit_watch *watch; | |
175 | ||
176 | watch = kzalloc(sizeof(*watch), GFP_KERNEL); | |
177 | if (unlikely(!watch)) | |
178 | return ERR_PTR(-ENOMEM); | |
179 | ||
180 | INIT_LIST_HEAD(&watch->rules); | |
181 | atomic_set(&watch->count, 1); | |
182 | watch->path = path; | |
84cb777e RGB |
183 | watch->dev = AUDIT_DEV_UNSET; |
184 | watch->ino = AUDIT_INO_UNSET; | |
cfcad62c EP |
185 | |
186 | return watch; | |
187 | } | |
188 | ||
fd97646b | 189 | /* Translate a watch string to kernel representation. */ |
cfcad62c EP |
190 | int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op) |
191 | { | |
192 | struct audit_watch *watch; | |
193 | ||
e9fd702a | 194 | if (!audit_watch_group) |
cfcad62c EP |
195 | return -EOPNOTSUPP; |
196 | ||
197 | if (path[0] != '/' || path[len-1] == '/' || | |
198 | krule->listnr != AUDIT_FILTER_EXIT || | |
199 | op != Audit_equal || | |
200 | krule->inode_f || krule->watch || krule->tree) | |
201 | return -EINVAL; | |
202 | ||
203 | watch = audit_init_watch(path); | |
204 | if (IS_ERR(watch)) | |
205 | return PTR_ERR(watch); | |
206 | ||
cfcad62c EP |
207 | krule->watch = watch; |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | /* Duplicate the given audit watch. The new watch's rules list is initialized | |
213 | * to an empty list and wlist is undefined. */ | |
214 | static struct audit_watch *audit_dupe_watch(struct audit_watch *old) | |
215 | { | |
216 | char *path; | |
217 | struct audit_watch *new; | |
218 | ||
219 | path = kstrdup(old->path, GFP_KERNEL); | |
220 | if (unlikely(!path)) | |
221 | return ERR_PTR(-ENOMEM); | |
222 | ||
223 | new = audit_init_watch(path); | |
224 | if (IS_ERR(new)) { | |
225 | kfree(path); | |
226 | goto out; | |
227 | } | |
228 | ||
229 | new->dev = old->dev; | |
230 | new->ino = old->ino; | |
e9fd702a | 231 | audit_get_parent(old->parent); |
cfcad62c EP |
232 | new->parent = old->parent; |
233 | ||
234 | out: | |
235 | return new; | |
236 | } | |
237 | ||
238 | static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op) | |
239 | { | |
240 | if (audit_enabled) { | |
241 | struct audit_buffer *ab; | |
242 | ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE); | |
0644ec0c KC |
243 | if (unlikely(!ab)) |
244 | return; | |
cfcad62c | 245 | audit_log_format(ab, "auid=%u ses=%u op=", |
e1760bd5 | 246 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
cfcad62c EP |
247 | audit_get_sessionid(current)); |
248 | audit_log_string(ab, op); | |
249 | audit_log_format(ab, " path="); | |
250 | audit_log_untrustedstring(ab, w->path); | |
9d960985 | 251 | audit_log_key(ab, r->filterkey); |
cfcad62c EP |
252 | audit_log_format(ab, " list=%d res=1", r->listnr); |
253 | audit_log_end(ab); | |
254 | } | |
255 | } | |
256 | ||
257 | /* Update inode info in audit rules based on filesystem event. */ | |
258 | static void audit_update_watch(struct audit_parent *parent, | |
259 | const char *dname, dev_t dev, | |
260 | unsigned long ino, unsigned invalidating) | |
261 | { | |
262 | struct audit_watch *owatch, *nwatch, *nextw; | |
263 | struct audit_krule *r, *nextr; | |
264 | struct audit_entry *oentry, *nentry; | |
265 | ||
266 | mutex_lock(&audit_filter_mutex); | |
ae7b8f41 EP |
267 | /* Run all of the watches on this parent looking for the one that |
268 | * matches the given dname */ | |
cfcad62c | 269 | list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) { |
e3d6b07b JL |
270 | if (audit_compare_dname_path(dname, owatch->path, |
271 | AUDIT_NAME_FULL)) | |
cfcad62c EP |
272 | continue; |
273 | ||
274 | /* If the update involves invalidating rules, do the inode-based | |
275 | * filtering now, so we don't omit records. */ | |
ae7b8f41 | 276 | if (invalidating && !audit_dummy_context()) |
cfcad62c EP |
277 | audit_filter_inodes(current, current->audit_context); |
278 | ||
ae7b8f41 EP |
279 | /* updating ino will likely change which audit_hash_list we |
280 | * are on so we need a new watch for the new list */ | |
cfcad62c EP |
281 | nwatch = audit_dupe_watch(owatch); |
282 | if (IS_ERR(nwatch)) { | |
283 | mutex_unlock(&audit_filter_mutex); | |
284 | audit_panic("error updating watch, skipping"); | |
285 | return; | |
286 | } | |
287 | nwatch->dev = dev; | |
288 | nwatch->ino = ino; | |
289 | ||
290 | list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) { | |
291 | ||
292 | oentry = container_of(r, struct audit_entry, rule); | |
293 | list_del(&oentry->rule.rlist); | |
294 | list_del_rcu(&oentry->list); | |
295 | ||
ae7b8f41 | 296 | nentry = audit_dupe_rule(&oentry->rule); |
cfcad62c EP |
297 | if (IS_ERR(nentry)) { |
298 | list_del(&oentry->rule.list); | |
299 | audit_panic("error updating watch, removing"); | |
300 | } else { | |
301 | int h = audit_hash_ino((u32)ino); | |
ae7b8f41 EP |
302 | |
303 | /* | |
304 | * nentry->rule.watch == oentry->rule.watch so | |
305 | * we must drop that reference and set it to our | |
306 | * new watch. | |
307 | */ | |
308 | audit_put_watch(nentry->rule.watch); | |
309 | audit_get_watch(nwatch); | |
310 | nentry->rule.watch = nwatch; | |
cfcad62c EP |
311 | list_add(&nentry->rule.rlist, &nwatch->rules); |
312 | list_add_rcu(&nentry->list, &audit_inode_hash[h]); | |
313 | list_replace(&oentry->rule.list, | |
314 | &nentry->rule.list); | |
315 | } | |
34d99af5 RGB |
316 | if (oentry->rule.exe) |
317 | audit_remove_mark(oentry->rule.exe); | |
cfcad62c | 318 | |
e7df61f4 | 319 | audit_watch_log_rule_change(r, owatch, "updated_rules"); |
cfcad62c EP |
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); | |
e7df61f4 | 347 | audit_watch_log_rule_change(r, w, "remove_rule"); |
34d99af5 RGB |
348 | if (e->rule.exe) |
349 | audit_remove_mark(e->rule.exe); | |
cfcad62c EP |
350 | list_del(&r->rlist); |
351 | list_del(&r->list); | |
352 | list_del_rcu(&e->list); | |
353 | call_rcu(&e->rcu, audit_free_rule_rcu); | |
354 | } | |
355 | audit_remove_watch(w); | |
356 | } | |
357 | mutex_unlock(&audit_filter_mutex); | |
e9fd702a | 358 | |
e2a29943 | 359 | fsnotify_destroy_mark(&parent->mark, audit_watch_group); |
cfcad62c EP |
360 | } |
361 | ||
cfcad62c | 362 | /* Get path information necessary for adding watches. */ |
15a9155f | 363 | static int audit_get_nd(struct audit_watch *watch, struct path *parent) |
cfcad62c | 364 | { |
79714f72 AV |
365 | struct dentry *d = kern_path_locked(watch->path, parent); |
366 | if (IS_ERR(d)) | |
15a9155f | 367 | return PTR_ERR(d); |
5955102c | 368 | inode_unlock(d_backing_inode(parent->dentry)); |
3b362157 | 369 | if (d_is_positive(d)) { |
15a9155f | 370 | /* update watch filter fields */ |
fc64005c | 371 | watch->dev = d->d_sb->s_dev; |
3b362157 | 372 | watch->ino = d_backing_inode(d)->i_ino; |
cfcad62c | 373 | } |
15a9155f | 374 | dput(d); |
cfcad62c EP |
375 | return 0; |
376 | } | |
377 | ||
e9fd702a | 378 | /* Associate the given rule with an existing parent. |
cfcad62c EP |
379 | * Caller must hold audit_filter_mutex. */ |
380 | static void audit_add_to_parent(struct audit_krule *krule, | |
381 | struct audit_parent *parent) | |
382 | { | |
383 | struct audit_watch *w, *watch = krule->watch; | |
384 | int watch_found = 0; | |
385 | ||
e9fd702a EP |
386 | BUG_ON(!mutex_is_locked(&audit_filter_mutex)); |
387 | ||
cfcad62c EP |
388 | list_for_each_entry(w, &parent->watches, wlist) { |
389 | if (strcmp(watch->path, w->path)) | |
390 | continue; | |
391 | ||
392 | watch_found = 1; | |
393 | ||
f8259b26 | 394 | /* put krule's ref to temporary watch */ |
cfcad62c EP |
395 | audit_put_watch(watch); |
396 | ||
397 | audit_get_watch(w); | |
398 | krule->watch = watch = w; | |
aa7c043d RGB |
399 | |
400 | audit_put_parent(parent); | |
cfcad62c EP |
401 | break; |
402 | } | |
403 | ||
404 | if (!watch_found) { | |
cfcad62c EP |
405 | watch->parent = parent; |
406 | ||
f8259b26 | 407 | audit_get_watch(watch); |
cfcad62c EP |
408 | list_add(&watch->wlist, &parent->watches); |
409 | } | |
410 | list_add(&krule->rlist, &watch->rules); | |
411 | } | |
412 | ||
413 | /* Find a matching watch entry, or add this one. | |
414 | * Caller must hold audit_filter_mutex. */ | |
ae7b8f41 | 415 | int audit_add_watch(struct audit_krule *krule, struct list_head **list) |
cfcad62c EP |
416 | { |
417 | struct audit_watch *watch = krule->watch; | |
cfcad62c | 418 | struct audit_parent *parent; |
15a9155f | 419 | struct path parent_path; |
ae7b8f41 | 420 | int h, ret = 0; |
cfcad62c | 421 | |
35fe4d0b EP |
422 | mutex_unlock(&audit_filter_mutex); |
423 | ||
424 | /* Avoid calling path_lookup under audit_filter_mutex. */ | |
15a9155f | 425 | ret = audit_get_nd(watch, &parent_path); |
35fe4d0b | 426 | |
15a9155f | 427 | /* caller expects mutex locked */ |
e118e9c5 EP |
428 | mutex_lock(&audit_filter_mutex); |
429 | ||
15a9155f AV |
430 | if (ret) |
431 | return ret; | |
cfcad62c | 432 | |
e118e9c5 | 433 | /* either find an old parent or attach a new one */ |
3b362157 | 434 | parent = audit_find_parent(d_backing_inode(parent_path.dentry)); |
e9fd702a | 435 | if (!parent) { |
15a9155f | 436 | parent = audit_init_parent(&parent_path); |
cfcad62c | 437 | if (IS_ERR(parent)) { |
35fe4d0b EP |
438 | ret = PTR_ERR(parent); |
439 | goto error; | |
cfcad62c | 440 | } |
e9fd702a | 441 | } |
cfcad62c | 442 | |
e118e9c5 | 443 | audit_add_to_parent(krule, parent); |
cfcad62c | 444 | |
ae7b8f41 EP |
445 | h = audit_hash_ino((u32)watch->ino); |
446 | *list = &audit_inode_hash[h]; | |
35fe4d0b | 447 | error: |
15a9155f | 448 | path_put(&parent_path); |
cfcad62c EP |
449 | return ret; |
450 | } | |
451 | ||
a05fb6cc | 452 | void audit_remove_watch_rule(struct audit_krule *krule) |
cfcad62c EP |
453 | { |
454 | struct audit_watch *watch = krule->watch; | |
455 | struct audit_parent *parent = watch->parent; | |
456 | ||
457 | list_del(&krule->rlist); | |
458 | ||
459 | if (list_empty(&watch->rules)) { | |
460 | audit_remove_watch(watch); | |
461 | ||
462 | if (list_empty(&parent->watches)) { | |
e9fd702a | 463 | audit_get_parent(parent); |
e2a29943 | 464 | fsnotify_destroy_mark(&parent->mark, audit_watch_group); |
a05fb6cc | 465 | audit_put_parent(parent); |
cfcad62c EP |
466 | } |
467 | } | |
468 | } | |
469 | ||
e9fd702a | 470 | /* Update watch data in audit rules based on fsnotify events. */ |
3a9b16b4 | 471 | static int audit_watch_handle_event(struct fsnotify_group *group, |
7053aee2 | 472 | struct inode *to_tell, |
ce8f76fb EP |
473 | struct fsnotify_mark *inode_mark, |
474 | struct fsnotify_mark *vfsmount_mark, | |
7053aee2 | 475 | u32 mask, void *data, int data_type, |
45a22f4c | 476 | const unsigned char *dname, u32 cookie) |
e9fd702a EP |
477 | { |
478 | struct inode *inode; | |
cfcad62c EP |
479 | struct audit_parent *parent; |
480 | ||
ce8f76fb | 481 | parent = container_of(inode_mark, struct audit_parent, mark); |
e9fd702a | 482 | |
4cd76a47 | 483 | BUG_ON(group != audit_watch_group); |
e9fd702a | 484 | |
7053aee2 | 485 | switch (data_type) { |
2069601b | 486 | case (FSNOTIFY_EVENT_PATH): |
3b362157 | 487 | inode = d_backing_inode(((struct path *)data)->dentry); |
e9fd702a EP |
488 | break; |
489 | case (FSNOTIFY_EVENT_INODE): | |
7053aee2 | 490 | inode = (struct inode *)data; |
e9fd702a EP |
491 | break; |
492 | default: | |
493 | BUG(); | |
494 | inode = NULL; | |
495 | break; | |
496 | }; | |
cfcad62c | 497 | |
e9fd702a | 498 | if (mask & (FS_CREATE|FS_MOVED_TO) && inode) |
ae7b8f41 | 499 | audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0); |
e9fd702a | 500 | else if (mask & (FS_DELETE|FS_MOVED_FROM)) |
84cb777e | 501 | audit_update_watch(parent, dname, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1); |
e9fd702a | 502 | else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF)) |
cfcad62c | 503 | audit_remove_parent_watches(parent); |
e9fd702a EP |
504 | |
505 | return 0; | |
506 | } | |
507 | ||
e9fd702a | 508 | static const struct fsnotify_ops audit_watch_fsnotify_ops = { |
e9fd702a | 509 | .handle_event = audit_watch_handle_event, |
cfcad62c EP |
510 | }; |
511 | ||
512 | static int __init audit_watch_init(void) | |
513 | { | |
0d2e2a1d | 514 | audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops); |
e9fd702a EP |
515 | if (IS_ERR(audit_watch_group)) { |
516 | audit_watch_group = NULL; | |
517 | audit_panic("cannot create audit fsnotify group"); | |
518 | } | |
cfcad62c EP |
519 | return 0; |
520 | } | |
1a3aedbc | 521 | device_initcall(audit_watch_init); |
34d99af5 RGB |
522 | |
523 | int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old) | |
524 | { | |
525 | struct audit_fsnotify_mark *audit_mark; | |
526 | char *pathname; | |
527 | ||
528 | pathname = kstrdup(audit_mark_path(old->exe), GFP_KERNEL); | |
529 | if (!pathname) | |
530 | return -ENOMEM; | |
531 | ||
532 | audit_mark = audit_alloc_mark(new, pathname, strlen(pathname)); | |
533 | if (IS_ERR(audit_mark)) { | |
534 | kfree(pathname); | |
535 | return PTR_ERR(audit_mark); | |
536 | } | |
537 | new->exe = audit_mark; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark) | |
543 | { | |
15ce414b RGB |
544 | struct file *exe_file; |
545 | unsigned long ino; | |
546 | dev_t dev; | |
547 | ||
5efc2443 MG |
548 | exe_file = get_task_exe_file(tsk); |
549 | if (!exe_file) | |
550 | return 0; | |
15ce414b RGB |
551 | ino = exe_file->f_inode->i_ino; |
552 | dev = exe_file->f_inode->i_sb->s_dev; | |
5efc2443 | 553 | fput(exe_file); |
34d99af5 RGB |
554 | return audit_mark_compare(mark, ino, dev); |
555 | } |