blob: 4a599f699adcfeca242e34f1a9691385a500450e [file] [log] [blame]
Eric Pariscfcad622009-06-11 14:31:36 -04001/* 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>
Eric Parise9fd7022009-12-17 20:12:04 -050027#include <linux/fsnotify_backend.h>
Eric Pariscfcad622009-06-11 14:31:36 -040028#include <linux/namei.h>
29#include <linux/netlink.h>
30#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Eric Pariscfcad622009-06-11 14:31:36 -040032#include <linux/security.h>
33#include "audit.h"
34
35/*
36 * Reference counting:
37 *
Eric Parise9fd7022009-12-17 20:12:04 -050038 * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED
Eric Pariscfcad622009-06-11 14:31:36 -040039 * 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
47struct audit_watch {
48 atomic_t count; /* reference count */
Eric Pariscfcad622009-06-11 14:31:36 -040049 dev_t dev; /* associated superblock device */
Eric Parise08b0612009-08-07 16:54:23 -040050 char *path; /* insertion path */
Eric Pariscfcad622009-06-11 14:31:36 -040051 unsigned long ino; /* associated inode number */
52 struct audit_parent *parent; /* associated parent */
53 struct list_head wlist; /* entry in parent->watches list */
Eric Parisae7b8f42009-12-17 20:12:04 -050054 struct list_head rules; /* anchor for krule->rlist */
Eric Pariscfcad622009-06-11 14:31:36 -040055};
56
57struct audit_parent {
Eric Parisae7b8f42009-12-17 20:12:04 -050058 struct list_head watches; /* anchor for audit_watch->wlist */
Eric Parise61ce862009-12-17 21:24:24 -050059 struct fsnotify_mark mark; /* fsnotify mark on the inode */
Eric Pariscfcad622009-06-11 14:31:36 -040060};
61
Eric Parise9fd7022009-12-17 20:12:04 -050062/* fsnotify handle. */
Stephen Hemmingerb8800aa2010-10-20 17:23:50 -070063static struct fsnotify_group *audit_watch_group;
Eric Pariscfcad622009-06-11 14:31:36 -040064
Eric Parise9fd7022009-12-17 20:12:04 -050065/* 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)
Eric Pariscfcad622009-06-11 14:31:36 -040068
Eric Parisae7b8f42009-12-17 20:12:04 -050069static void audit_free_parent(struct audit_parent *parent)
70{
71 WARN_ON(!list_empty(&parent->watches));
72 kfree(parent);
73}
74
Eric Parise61ce862009-12-17 21:24:24 -050075static void audit_watch_free_mark(struct fsnotify_mark *entry)
Eric Pariscfcad622009-06-11 14:31:36 -040076{
77 struct audit_parent *parent;
78
Eric Parise9fd7022009-12-17 20:12:04 -050079 parent = container_of(entry, struct audit_parent, mark);
Eric Parisae7b8f42009-12-17 20:12:04 -050080 audit_free_parent(parent);
Eric Pariscfcad622009-06-11 14:31:36 -040081}
82
Eric Parise9fd7022009-12-17 20:12:04 -050083static void audit_get_parent(struct audit_parent *parent)
84{
85 if (likely(parent))
86 fsnotify_get_mark(&parent->mark);
87}
88
89static 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 */
99static inline struct audit_parent *audit_find_parent(struct inode *inode)
100{
101 struct audit_parent *parent = NULL;
Eric Parise61ce862009-12-17 21:24:24 -0500102 struct fsnotify_mark *entry;
Eric Parise9fd7022009-12-17 20:12:04 -0500103
Eric Paris5444e292009-12-17 21:24:27 -0500104 entry = fsnotify_find_inode_mark(audit_watch_group, inode);
Eric Parise9fd7022009-12-17 20:12:04 -0500105 if (entry)
106 parent = container_of(entry, struct audit_parent, mark);
107
108 return parent;
109}
110
Eric Pariscfcad622009-06-11 14:31:36 -0400111void audit_get_watch(struct audit_watch *watch)
112{
113 atomic_inc(&watch->count);
114}
115
116void audit_put_watch(struct audit_watch *watch)
117{
118 if (atomic_dec_and_test(&watch->count)) {
119 WARN_ON(watch->parent);
120 WARN_ON(!list_empty(&watch->rules));
121 kfree(watch->path);
122 kfree(watch);
123 }
124}
125
Stephen Hemmingerb8800aa2010-10-20 17:23:50 -0700126static void audit_remove_watch(struct audit_watch *watch)
Eric Pariscfcad622009-06-11 14:31:36 -0400127{
128 list_del(&watch->wlist);
Eric Parise9fd7022009-12-17 20:12:04 -0500129 audit_put_parent(watch->parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400130 watch->parent = NULL;
131 audit_put_watch(watch); /* match initial get */
132}
133
134char *audit_watch_path(struct audit_watch *watch)
135{
136 return watch->path;
137}
138
Eric Parisae7b8f42009-12-17 20:12:04 -0500139int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev)
Eric Pariscfcad622009-06-11 14:31:36 -0400140{
Eric Parisae7b8f42009-12-17 20:12:04 -0500141 return (watch->ino != (unsigned long)-1) &&
142 (watch->ino == ino) &&
143 (watch->dev == dev);
Eric Pariscfcad622009-06-11 14:31:36 -0400144}
145
146/* Initialize a parent watch entry. */
Al Viro15a91552011-02-16 15:08:54 -0500147static struct audit_parent *audit_init_parent(struct path *path)
Eric Pariscfcad622009-06-11 14:31:36 -0400148{
Al Viro15a91552011-02-16 15:08:54 -0500149 struct inode *inode = path->dentry->d_inode;
Eric Pariscfcad622009-06-11 14:31:36 -0400150 struct audit_parent *parent;
Eric Parise9fd7022009-12-17 20:12:04 -0500151 int ret;
Eric Pariscfcad622009-06-11 14:31:36 -0400152
153 parent = kzalloc(sizeof(*parent), GFP_KERNEL);
154 if (unlikely(!parent))
155 return ERR_PTR(-ENOMEM);
156
157 INIT_LIST_HEAD(&parent->watches);
Eric Pariscfcad622009-06-11 14:31:36 -0400158
Eric Parise9fd7022009-12-17 20:12:04 -0500159 fsnotify_init_mark(&parent->mark, audit_watch_free_mark);
160 parent->mark.mask = AUDIT_FS_WATCH;
Eric Paris5444e292009-12-17 21:24:27 -0500161 ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, NULL, 0);
Eric Parise9fd7022009-12-17 20:12:04 -0500162 if (ret < 0) {
Eric Parisae7b8f42009-12-17 20:12:04 -0500163 audit_free_parent(parent);
Eric Parise9fd7022009-12-17 20:12:04 -0500164 return ERR_PTR(ret);
Eric Pariscfcad622009-06-11 14:31:36 -0400165 }
166
167 return parent;
168}
169
170/* Initialize a watch entry. */
171static struct audit_watch *audit_init_watch(char *path)
172{
173 struct audit_watch *watch;
174
175 watch = kzalloc(sizeof(*watch), GFP_KERNEL);
176 if (unlikely(!watch))
177 return ERR_PTR(-ENOMEM);
178
179 INIT_LIST_HEAD(&watch->rules);
180 atomic_set(&watch->count, 1);
181 watch->path = path;
182 watch->dev = (dev_t)-1;
183 watch->ino = (unsigned long)-1;
184
185 return watch;
186}
187
188/* Translate a watch string to kernel respresentation. */
189int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op)
190{
191 struct audit_watch *watch;
192
Eric Parise9fd7022009-12-17 20:12:04 -0500193 if (!audit_watch_group)
Eric Pariscfcad622009-06-11 14:31:36 -0400194 return -EOPNOTSUPP;
195
196 if (path[0] != '/' || path[len-1] == '/' ||
197 krule->listnr != AUDIT_FILTER_EXIT ||
198 op != Audit_equal ||
199 krule->inode_f || krule->watch || krule->tree)
200 return -EINVAL;
201
202 watch = audit_init_watch(path);
203 if (IS_ERR(watch))
204 return PTR_ERR(watch);
205
206 audit_get_watch(watch);
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. */
214static 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;
Eric Parise9fd7022009-12-17 20:12:04 -0500231 audit_get_parent(old->parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400232 new->parent = old->parent;
233
234out:
235 return new;
236}
237
238static 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);
243 audit_log_format(ab, "auid=%u ses=%u op=",
Eric W. Biedermane1760bd2012-09-10 22:39:43 -0700244 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Eric Pariscfcad622009-06-11 14:31:36 -0400245 audit_get_sessionid(current));
246 audit_log_string(ab, op);
247 audit_log_format(ab, " path=");
248 audit_log_untrustedstring(ab, w->path);
Eric Paris9d960982009-06-11 14:31:37 -0400249 audit_log_key(ab, r->filterkey);
Eric Pariscfcad622009-06-11 14:31:36 -0400250 audit_log_format(ab, " list=%d res=1", r->listnr);
251 audit_log_end(ab);
252 }
253}
254
255/* Update inode info in audit rules based on filesystem event. */
256static void audit_update_watch(struct audit_parent *parent,
257 const char *dname, dev_t dev,
258 unsigned long ino, unsigned invalidating)
259{
260 struct audit_watch *owatch, *nwatch, *nextw;
261 struct audit_krule *r, *nextr;
262 struct audit_entry *oentry, *nentry;
263
264 mutex_lock(&audit_filter_mutex);
Eric Parisae7b8f42009-12-17 20:12:04 -0500265 /* Run all of the watches on this parent looking for the one that
266 * matches the given dname */
Eric Pariscfcad622009-06-11 14:31:36 -0400267 list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
Jeff Laytone3d6b072012-10-10 15:25:25 -0400268 if (audit_compare_dname_path(dname, owatch->path,
269 AUDIT_NAME_FULL))
Eric Pariscfcad622009-06-11 14:31:36 -0400270 continue;
271
272 /* If the update involves invalidating rules, do the inode-based
273 * filtering now, so we don't omit records. */
Eric Parisae7b8f42009-12-17 20:12:04 -0500274 if (invalidating && !audit_dummy_context())
Eric Pariscfcad622009-06-11 14:31:36 -0400275 audit_filter_inodes(current, current->audit_context);
276
Eric Parisae7b8f42009-12-17 20:12:04 -0500277 /* updating ino will likely change which audit_hash_list we
278 * are on so we need a new watch for the new list */
Eric Pariscfcad622009-06-11 14:31:36 -0400279 nwatch = audit_dupe_watch(owatch);
280 if (IS_ERR(nwatch)) {
281 mutex_unlock(&audit_filter_mutex);
282 audit_panic("error updating watch, skipping");
283 return;
284 }
285 nwatch->dev = dev;
286 nwatch->ino = ino;
287
288 list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) {
289
290 oentry = container_of(r, struct audit_entry, rule);
291 list_del(&oentry->rule.rlist);
292 list_del_rcu(&oentry->list);
293
Eric Parisae7b8f42009-12-17 20:12:04 -0500294 nentry = audit_dupe_rule(&oentry->rule);
Eric Pariscfcad622009-06-11 14:31:36 -0400295 if (IS_ERR(nentry)) {
296 list_del(&oentry->rule.list);
297 audit_panic("error updating watch, removing");
298 } else {
299 int h = audit_hash_ino((u32)ino);
Eric Parisae7b8f42009-12-17 20:12:04 -0500300
301 /*
302 * nentry->rule.watch == oentry->rule.watch so
303 * we must drop that reference and set it to our
304 * new watch.
305 */
306 audit_put_watch(nentry->rule.watch);
307 audit_get_watch(nwatch);
308 nentry->rule.watch = nwatch;
Eric Pariscfcad622009-06-11 14:31:36 -0400309 list_add(&nentry->rule.rlist, &nwatch->rules);
310 list_add_rcu(&nentry->list, &audit_inode_hash[h]);
311 list_replace(&oentry->rule.list,
312 &nentry->rule.list);
313 }
314
315 audit_watch_log_rule_change(r, owatch, "updated rules");
316
317 call_rcu(&oentry->rcu, audit_free_rule_rcu);
318 }
319
320 audit_remove_watch(owatch);
321 goto add_watch_to_parent; /* event applies to a single watch */
322 }
323 mutex_unlock(&audit_filter_mutex);
324 return;
325
326add_watch_to_parent:
327 list_add(&nwatch->wlist, &parent->watches);
328 mutex_unlock(&audit_filter_mutex);
329 return;
330}
331
332/* Remove all watches & rules associated with a parent that is going away. */
333static void audit_remove_parent_watches(struct audit_parent *parent)
334{
335 struct audit_watch *w, *nextw;
336 struct audit_krule *r, *nextr;
337 struct audit_entry *e;
338
339 mutex_lock(&audit_filter_mutex);
Eric Pariscfcad622009-06-11 14:31:36 -0400340 list_for_each_entry_safe(w, nextw, &parent->watches, wlist) {
341 list_for_each_entry_safe(r, nextr, &w->rules, rlist) {
342 e = container_of(r, struct audit_entry, rule);
343 audit_watch_log_rule_change(r, w, "remove rule");
344 list_del(&r->rlist);
345 list_del(&r->list);
346 list_del_rcu(&e->list);
347 call_rcu(&e->rcu, audit_free_rule_rcu);
348 }
349 audit_remove_watch(w);
350 }
351 mutex_unlock(&audit_filter_mutex);
Eric Parise9fd7022009-12-17 20:12:04 -0500352
Lino Sanfilippoe2a29942011-06-14 17:29:51 +0200353 fsnotify_destroy_mark(&parent->mark, audit_watch_group);
Eric Pariscfcad622009-06-11 14:31:36 -0400354}
355
Eric Pariscfcad622009-06-11 14:31:36 -0400356/* Get path information necessary for adding watches. */
Al Viro15a91552011-02-16 15:08:54 -0500357static int audit_get_nd(struct audit_watch *watch, struct path *parent)
Eric Pariscfcad622009-06-11 14:31:36 -0400358{
Al Viro79714f72012-06-15 03:01:42 +0400359 struct dentry *d = kern_path_locked(watch->path, parent);
360 if (IS_ERR(d))
Al Viro15a91552011-02-16 15:08:54 -0500361 return PTR_ERR(d);
Al Viro79714f72012-06-15 03:01:42 +0400362 mutex_unlock(&parent->dentry->d_inode->i_mutex);
Al Viro15a91552011-02-16 15:08:54 -0500363 if (d->d_inode) {
364 /* update watch filter fields */
365 watch->dev = d->d_inode->i_sb->s_dev;
366 watch->ino = d->d_inode->i_ino;
367 }
Al Viro15a91552011-02-16 15:08:54 -0500368 dput(d);
Eric Pariscfcad622009-06-11 14:31:36 -0400369 return 0;
370}
371
Eric Parise9fd7022009-12-17 20:12:04 -0500372/* Associate the given rule with an existing parent.
Eric Pariscfcad622009-06-11 14:31:36 -0400373 * Caller must hold audit_filter_mutex. */
374static void audit_add_to_parent(struct audit_krule *krule,
375 struct audit_parent *parent)
376{
377 struct audit_watch *w, *watch = krule->watch;
378 int watch_found = 0;
379
Eric Parise9fd7022009-12-17 20:12:04 -0500380 BUG_ON(!mutex_is_locked(&audit_filter_mutex));
381
Eric Pariscfcad622009-06-11 14:31:36 -0400382 list_for_each_entry(w, &parent->watches, wlist) {
383 if (strcmp(watch->path, w->path))
384 continue;
385
386 watch_found = 1;
387
388 /* put krule's and initial refs to temporary watch */
389 audit_put_watch(watch);
390 audit_put_watch(watch);
391
392 audit_get_watch(w);
393 krule->watch = watch = w;
394 break;
395 }
396
397 if (!watch_found) {
Eric Parise9fd7022009-12-17 20:12:04 -0500398 audit_get_parent(parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400399 watch->parent = parent;
400
401 list_add(&watch->wlist, &parent->watches);
402 }
403 list_add(&krule->rlist, &watch->rules);
404}
405
406/* Find a matching watch entry, or add this one.
407 * Caller must hold audit_filter_mutex. */
Eric Parisae7b8f42009-12-17 20:12:04 -0500408int audit_add_watch(struct audit_krule *krule, struct list_head **list)
Eric Pariscfcad622009-06-11 14:31:36 -0400409{
410 struct audit_watch *watch = krule->watch;
Eric Pariscfcad622009-06-11 14:31:36 -0400411 struct audit_parent *parent;
Al Viro15a91552011-02-16 15:08:54 -0500412 struct path parent_path;
Eric Parisae7b8f42009-12-17 20:12:04 -0500413 int h, ret = 0;
Eric Pariscfcad622009-06-11 14:31:36 -0400414
Eric Paris35fe4d02009-06-11 14:31:36 -0400415 mutex_unlock(&audit_filter_mutex);
416
417 /* Avoid calling path_lookup under audit_filter_mutex. */
Al Viro15a91552011-02-16 15:08:54 -0500418 ret = audit_get_nd(watch, &parent_path);
Eric Paris35fe4d02009-06-11 14:31:36 -0400419
Al Viro15a91552011-02-16 15:08:54 -0500420 /* caller expects mutex locked */
Eric Parise118e9c2009-12-17 20:12:04 -0500421 mutex_lock(&audit_filter_mutex);
422
Al Viro15a91552011-02-16 15:08:54 -0500423 if (ret)
424 return ret;
Eric Pariscfcad622009-06-11 14:31:36 -0400425
Eric Parise118e9c2009-12-17 20:12:04 -0500426 /* either find an old parent or attach a new one */
Al Viro15a91552011-02-16 15:08:54 -0500427 parent = audit_find_parent(parent_path.dentry->d_inode);
Eric Parise9fd7022009-12-17 20:12:04 -0500428 if (!parent) {
Al Viro15a91552011-02-16 15:08:54 -0500429 parent = audit_init_parent(&parent_path);
Eric Pariscfcad622009-06-11 14:31:36 -0400430 if (IS_ERR(parent)) {
Eric Paris35fe4d02009-06-11 14:31:36 -0400431 ret = PTR_ERR(parent);
432 goto error;
Eric Pariscfcad622009-06-11 14:31:36 -0400433 }
Eric Parise9fd7022009-12-17 20:12:04 -0500434 }
Eric Pariscfcad622009-06-11 14:31:36 -0400435
Eric Parise118e9c2009-12-17 20:12:04 -0500436 audit_add_to_parent(krule, parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400437
Eric Parise9fd7022009-12-17 20:12:04 -0500438 /* match get in audit_find_parent or audit_init_parent */
439 audit_put_parent(parent);
Eric Paris35fe4d02009-06-11 14:31:36 -0400440
Eric Parisae7b8f42009-12-17 20:12:04 -0500441 h = audit_hash_ino((u32)watch->ino);
442 *list = &audit_inode_hash[h];
Eric Paris35fe4d02009-06-11 14:31:36 -0400443error:
Al Viro15a91552011-02-16 15:08:54 -0500444 path_put(&parent_path);
Eric Pariscfcad622009-06-11 14:31:36 -0400445 return ret;
Eric Pariscfcad622009-06-11 14:31:36 -0400446}
447
Eric Parisa05fb6c2009-12-17 20:12:05 -0500448void audit_remove_watch_rule(struct audit_krule *krule)
Eric Pariscfcad622009-06-11 14:31:36 -0400449{
450 struct audit_watch *watch = krule->watch;
451 struct audit_parent *parent = watch->parent;
452
453 list_del(&krule->rlist);
454
455 if (list_empty(&watch->rules)) {
456 audit_remove_watch(watch);
457
458 if (list_empty(&parent->watches)) {
Eric Parise9fd7022009-12-17 20:12:04 -0500459 audit_get_parent(parent);
Lino Sanfilippoe2a29942011-06-14 17:29:51 +0200460 fsnotify_destroy_mark(&parent->mark, audit_watch_group);
Eric Parisa05fb6c2009-12-17 20:12:05 -0500461 audit_put_parent(parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400462 }
463 }
464}
465
Eric Paris7b0a04f2009-12-17 21:24:21 -0500466static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode,
Eric Paris1968f5e2010-07-28 10:18:39 -0400467 struct fsnotify_mark *inode_mark,
Eric Parisce8f76f2010-07-28 10:18:39 -0400468 struct fsnotify_mark *vfsmount_mark,
Eric Paris3a9b16b2010-07-28 10:18:38 -0400469 __u32 mask, void *data, int data_type)
Eric Parise9fd7022009-12-17 20:12:04 -0500470{
Eric Paris2612abb2010-07-28 10:18:39 -0400471 return true;
Eric Parise9fd7022009-12-17 20:12:04 -0500472}
473
474/* Update watch data in audit rules based on fsnotify events. */
Eric Paris3a9b16b2010-07-28 10:18:38 -0400475static int audit_watch_handle_event(struct fsnotify_group *group,
Eric Parisce8f76f2010-07-28 10:18:39 -0400476 struct fsnotify_mark *inode_mark,
477 struct fsnotify_mark *vfsmount_mark,
Eric Paris3a9b16b2010-07-28 10:18:38 -0400478 struct fsnotify_event *event)
Eric Parise9fd7022009-12-17 20:12:04 -0500479{
480 struct inode *inode;
481 __u32 mask = event->mask;
482 const char *dname = event->file_name;
483 struct audit_parent *parent;
484
Eric Parisce8f76f2010-07-28 10:18:39 -0400485 parent = container_of(inode_mark, struct audit_parent, mark);
Eric Parise9fd7022009-12-17 20:12:04 -0500486
Eric Paris4cd76a42010-07-28 10:18:38 -0400487 BUG_ON(group != audit_watch_group);
Eric Parise9fd7022009-12-17 20:12:04 -0500488
489 switch (event->data_type) {
Linus Torvalds20696012010-08-12 14:23:04 -0700490 case (FSNOTIFY_EVENT_PATH):
491 inode = event->path.dentry->d_inode;
Eric Parise9fd7022009-12-17 20:12:04 -0500492 break;
493 case (FSNOTIFY_EVENT_INODE):
494 inode = event->inode;
495 break;
496 default:
497 BUG();
498 inode = NULL;
499 break;
500 };
501
502 if (mask & (FS_CREATE|FS_MOVED_TO) && inode)
503 audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
504 else if (mask & (FS_DELETE|FS_MOVED_FROM))
505 audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1);
506 else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF))
507 audit_remove_parent_watches(parent);
Eric Parise9fd7022009-12-17 20:12:04 -0500508
509 return 0;
510}
511
Eric Parise9fd7022009-12-17 20:12:04 -0500512static const struct fsnotify_ops audit_watch_fsnotify_ops = {
513 .should_send_event = audit_watch_should_send_event,
514 .handle_event = audit_watch_handle_event,
515 .free_group_priv = NULL,
Eric Parise118e9c2009-12-17 20:12:04 -0500516 .freeing_mark = NULL,
Eric Parise9fd7022009-12-17 20:12:04 -0500517 .free_event_priv = NULL,
Eric Pariscfcad622009-06-11 14:31:36 -0400518};
519
520static int __init audit_watch_init(void)
521{
Eric Paris0d2e2a12009-12-17 21:24:22 -0500522 audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops);
Eric Parise9fd7022009-12-17 20:12:04 -0500523 if (IS_ERR(audit_watch_group)) {
524 audit_watch_group = NULL;
525 audit_panic("cannot create audit fsnotify group");
526 }
Eric Pariscfcad622009-06-11 14:31:36 -0400527 return 0;
528}
Eric Paris1a3aedb2009-12-17 20:12:06 -0500529device_initcall(audit_watch_init);