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cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
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>
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
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27 #include <linux/fsnotify_backend.h>
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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28 #include <linux/namei.h>
29 #include <linux/netlink.h>
30 #include <linux/sched.h>
5a0e3ad @htejun include cleanup: Update gfp.h and slab.h includes to prepare for brea…
htejun authored Mar 24, 2010
31 #include <linux/slab.h>
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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32 #include <linux/security.h>
33 #include "audit.h"
34
35 /*
36 * Reference counting:
37 *
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
38 * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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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 */
49 dev_t dev; /* associated superblock device */
e08b061 @eparis Audit: reorganize struct audit_watch to save 8 bytes
eparis authored Aug 7, 2009
50 char *path; /* insertion path */
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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51 unsigned long ino; /* associated inode number */
52 struct audit_parent *parent; /* associated parent */
53 struct list_head wlist; /* entry in parent->watches list */
ae7b8f4 @eparis Audit: clean up the audit_watch split
eparis authored Dec 17, 2009
54 struct list_head rules; /* anchor for krule->rlist */
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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55 };
56
57 struct audit_parent {
ae7b8f4 @eparis Audit: clean up the audit_watch split
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58 struct list_head watches; /* anchor for audit_watch->wlist */
e61ce86 @eparis fsnotify: rename fsnotify_mark_entry to just fsnotify_mark
eparis authored Dec 17, 2009
59 struct fsnotify_mark mark; /* fsnotify mark on the inode */
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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60 };
61
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62 /* fsnotify handle. */
b8800aa audit: make functions static
Stephen Hemminger authored Oct 20, 2010
63 static struct fsnotify_group *audit_watch_group;
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64
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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)
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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68
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69 static void audit_free_parent(struct audit_parent *parent)
70 {
71 WARN_ON(!list_empty(&parent->watches));
72 kfree(parent);
73 }
74
e61ce86 @eparis fsnotify: rename fsnotify_mark_entry to just fsnotify_mark
eparis authored Dec 18, 2009
75 static void audit_watch_free_mark(struct fsnotify_mark *entry)
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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76 {
77 struct audit_parent *parent;
78
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79 parent = container_of(entry, struct audit_parent, mark);
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80 audit_free_parent(parent);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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81 }
82
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
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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;
e61ce86 @eparis fsnotify: rename fsnotify_mark_entry to just fsnotify_mark
eparis authored Dec 18, 2009
102 struct fsnotify_mark *entry;
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
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103
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104 entry = fsnotify_find_inode_mark(audit_watch_group, inode);
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105 if (entry)
106 parent = container_of(entry, struct audit_parent, mark);
107
108 return parent;
109 }
110
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
111 void audit_get_watch(struct audit_watch *watch)
112 {
113 atomic_inc(&watch->count);
114 }
115
116 void 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
b8800aa audit: make functions static
Stephen Hemminger authored Oct 21, 2010
126 static void audit_remove_watch(struct audit_watch *watch)
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127 {
128 list_del(&watch->wlist);
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129 audit_put_parent(watch->parent);
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130 watch->parent = NULL;
131 audit_put_watch(watch); /* match initial get */
132 }
133
134 char *audit_watch_path(struct audit_watch *watch)
135 {
136 return watch->path;
137 }
138
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139 int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev)
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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140 {
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141 return (watch->ino != (unsigned long)-1) &&
142 (watch->ino == ino) &&
143 (watch->dev == dev);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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144 }
145
146 /* Initialize a parent watch entry. */
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
147 static struct audit_parent *audit_init_parent(struct path *path)
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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148 {
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149 struct inode *inode = path->dentry->d_inode;
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150 struct audit_parent *parent;
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151 int ret;
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152
153 parent = kzalloc(sizeof(*parent), GFP_KERNEL);
154 if (unlikely(!parent))
155 return ERR_PTR(-ENOMEM);
156
157 INIT_LIST_HEAD(&parent->watches);
158
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
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159 fsnotify_init_mark(&parent->mark, audit_watch_free_mark);
160 parent->mark.mask = AUDIT_FS_WATCH;
5444e29 @eparis fsnotify: split generic and inode specific mark code
eparis authored Dec 18, 2009
161 ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, NULL, 0);
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162 if (ret < 0) {
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163 audit_free_parent(parent);
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164 return ERR_PTR(ret);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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165 }
166
167 return parent;
168 }
169
170 /* Initialize a watch entry. */
171 static 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. */
189 int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op)
190 {
191 struct audit_watch *watch;
192
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
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193 if (!audit_watch_group)
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194 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. */
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;
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
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231 audit_get_parent(old->parent);
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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);
243 audit_log_format(ab, "auid=%u ses=%u op=",
e1760bd @ebiederm userns: Convert the audit loginuid to be a kuid
ebiederm authored Sep 10, 2012
244 from_kuid(&init_user_ns, audit_get_loginuid(current)),
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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245 audit_get_sessionid(current));
246 audit_log_string(ab, op);
247 audit_log_format(ab, " path=");
248 audit_log_untrustedstring(ab, w->path);
9d96098 @eparis Audit: clean up all op= output to include string quoting
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249 audit_log_key(ab, r->filterkey);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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250 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. */
256 static 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);
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265 /* Run all of the watches on this parent looking for the one that
266 * matches the given dname */
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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267 list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
268 if (audit_compare_dname_path(dname, owatch->path, NULL))
269 continue;
270
271 /* If the update involves invalidating rules, do the inode-based
272 * filtering now, so we don't omit records. */
ae7b8f4 @eparis Audit: clean up the audit_watch split
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273 if (invalidating && !audit_dummy_context())
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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274 audit_filter_inodes(current, current->audit_context);
275
ae7b8f4 @eparis Audit: clean up the audit_watch split
eparis authored Dec 18, 2009
276 /* updating ino will likely change which audit_hash_list we
277 * are on so we need a new watch for the new list */
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
278 nwatch = audit_dupe_watch(owatch);
279 if (IS_ERR(nwatch)) {
280 mutex_unlock(&audit_filter_mutex);
281 audit_panic("error updating watch, skipping");
282 return;
283 }
284 nwatch->dev = dev;
285 nwatch->ino = ino;
286
287 list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) {
288
289 oentry = container_of(r, struct audit_entry, rule);
290 list_del(&oentry->rule.rlist);
291 list_del_rcu(&oentry->list);
292
ae7b8f4 @eparis Audit: clean up the audit_watch split
eparis authored Dec 18, 2009
293 nentry = audit_dupe_rule(&oentry->rule);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
294 if (IS_ERR(nentry)) {
295 list_del(&oentry->rule.list);
296 audit_panic("error updating watch, removing");
297 } else {
298 int h = audit_hash_ino((u32)ino);
ae7b8f4 @eparis Audit: clean up the audit_watch split
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299
300 /*
301 * nentry->rule.watch == oentry->rule.watch so
302 * we must drop that reference and set it to our
303 * new watch.
304 */
305 audit_put_watch(nentry->rule.watch);
306 audit_get_watch(nwatch);
307 nentry->rule.watch = nwatch;
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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308 list_add(&nentry->rule.rlist, &nwatch->rules);
309 list_add_rcu(&nentry->list, &audit_inode_hash[h]);
310 list_replace(&oentry->rule.list,
311 &nentry->rule.list);
312 }
313
314 audit_watch_log_rule_change(r, owatch, "updated rules");
315
316 call_rcu(&oentry->rcu, audit_free_rule_rcu);
317 }
318
319 audit_remove_watch(owatch);
320 goto add_watch_to_parent; /* event applies to a single watch */
321 }
322 mutex_unlock(&audit_filter_mutex);
323 return;
324
325 add_watch_to_parent:
326 list_add(&nwatch->wlist, &parent->watches);
327 mutex_unlock(&audit_filter_mutex);
328 return;
329 }
330
331 /* Remove all watches & rules associated with a parent that is going away. */
332 static void audit_remove_parent_watches(struct audit_parent *parent)
333 {
334 struct audit_watch *w, *nextw;
335 struct audit_krule *r, *nextr;
336 struct audit_entry *e;
337
338 mutex_lock(&audit_filter_mutex);
339 list_for_each_entry_safe(w, nextw, &parent->watches, wlist) {
340 list_for_each_entry_safe(r, nextr, &w->rules, rlist) {
341 e = container_of(r, struct audit_entry, rule);
342 audit_watch_log_rule_change(r, w, "remove rule");
343 list_del(&r->rlist);
344 list_del(&r->list);
345 list_del_rcu(&e->list);
346 call_rcu(&e->rcu, audit_free_rule_rcu);
347 }
348 audit_remove_watch(w);
349 }
350 mutex_unlock(&audit_filter_mutex);
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
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351
d077544 @eparis fsnotify: rename fsnotify_find_mark_entry to fsnotify_find_mark
eparis authored Dec 17, 2009
352 fsnotify_destroy_mark(&parent->mark);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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353 }
354
355 /* Get path information necessary for adding watches. */
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
356 static int audit_get_nd(struct audit_watch *watch, struct path *parent)
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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357 {
79714f7 get rid of kern_path_parent()
Al Viro authored Jun 15, 2012
358 struct dentry *d = kern_path_locked(watch->path, parent);
359 if (IS_ERR(d))
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
360 return PTR_ERR(d);
79714f7 get rid of kern_path_parent()
Al Viro authored Jun 14, 2012
361 mutex_unlock(&parent->dentry->d_inode->i_mutex);
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
362 if (d->d_inode) {
363 /* update watch filter fields */
364 watch->dev = d->d_inode->i_sb->s_dev;
365 watch->ino = d->d_inode->i_ino;
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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366 }
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
367 dput(d);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
368 return 0;
369 }
370
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
371 /* Associate the given rule with an existing parent.
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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372 * Caller must hold audit_filter_mutex. */
373 static void audit_add_to_parent(struct audit_krule *krule,
374 struct audit_parent *parent)
375 {
376 struct audit_watch *w, *watch = krule->watch;
377 int watch_found = 0;
378
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
379 BUG_ON(!mutex_is_locked(&audit_filter_mutex));
380
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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381 list_for_each_entry(w, &parent->watches, wlist) {
382 if (strcmp(watch->path, w->path))
383 continue;
384
385 watch_found = 1;
386
387 /* put krule's and initial refs to temporary watch */
388 audit_put_watch(watch);
389 audit_put_watch(watch);
390
391 audit_get_watch(w);
392 krule->watch = watch = w;
393 break;
394 }
395
396 if (!watch_found) {
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
397 audit_get_parent(parent);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
398 watch->parent = parent;
399
400 list_add(&watch->wlist, &parent->watches);
401 }
402 list_add(&krule->rlist, &watch->rules);
403 }
404
405 /* Find a matching watch entry, or add this one.
406 * Caller must hold audit_filter_mutex. */
ae7b8f4 @eparis Audit: clean up the audit_watch split
eparis authored Dec 18, 2009
407 int audit_add_watch(struct audit_krule *krule, struct list_head **list)
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
408 {
409 struct audit_watch *watch = krule->watch;
410 struct audit_parent *parent;
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
411 struct path parent_path;
ae7b8f4 @eparis Audit: clean up the audit_watch split
eparis authored Dec 18, 2009
412 int h, ret = 0;
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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413
35fe4d0 @eparis Audit: move audit_get_nd completely into audit_watch
eparis authored Jun 11, 2009
414 mutex_unlock(&audit_filter_mutex);
415
416 /* Avoid calling path_lookup under audit_filter_mutex. */
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
417 ret = audit_get_nd(watch, &parent_path);
35fe4d0 @eparis Audit: move audit_get_nd completely into audit_watch
eparis authored Jun 11, 2009
418
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
419 /* caller expects mutex locked */
e118e9c @eparis audit: redo audit watch locking and refcnt in light of fsnotify
eparis authored Dec 17, 2009
420 mutex_lock(&audit_filter_mutex);
421
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
422 if (ret)
423 return ret;
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
424
e118e9c @eparis audit: redo audit watch locking and refcnt in light of fsnotify
eparis authored Dec 18, 2009
425 /* either find an old parent or attach a new one */
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
426 parent = audit_find_parent(parent_path.dentry->d_inode);
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
427 if (!parent) {
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
428 parent = audit_init_parent(&parent_path);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
429 if (IS_ERR(parent)) {
35fe4d0 @eparis Audit: move audit_get_nd completely into audit_watch
eparis authored Jun 11, 2009
430 ret = PTR_ERR(parent);
431 goto error;
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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432 }
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
433 }
cfcad62 @eparis audit: seperate audit inode watches into a subfile
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434
e118e9c @eparis audit: redo audit watch locking and refcnt in light of fsnotify
eparis authored Dec 18, 2009
435 audit_add_to_parent(krule, parent);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
436
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
437 /* match get in audit_find_parent or audit_init_parent */
438 audit_put_parent(parent);
35fe4d0 @eparis Audit: move audit_get_nd completely into audit_watch
eparis authored Jun 11, 2009
439
ae7b8f4 @eparis Audit: clean up the audit_watch split
eparis authored Dec 18, 2009
440 h = audit_hash_ino((u32)watch->ino);
441 *list = &audit_inode_hash[h];
35fe4d0 @eparis Audit: move audit_get_nd completely into audit_watch
eparis authored Jun 11, 2009
442 error:
15a9155 fix race in audit_get_nd()
Al Viro authored Feb 16, 2011
443 path_put(&parent_path);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
444 return ret;
445 }
446
a05fb6c @eparis audit: do not get and put just to free a watch
eparis authored Dec 17, 2009
447 void audit_remove_watch_rule(struct audit_krule *krule)
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
448 {
449 struct audit_watch *watch = krule->watch;
450 struct audit_parent *parent = watch->parent;
451
452 list_del(&krule->rlist);
453
454 if (list_empty(&watch->rules)) {
455 audit_remove_watch(watch);
456
457 if (list_empty(&parent->watches)) {
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
458 audit_get_parent(parent);
d077544 @eparis fsnotify: rename fsnotify_find_mark_entry to fsnotify_find_mark
eparis authored Dec 18, 2009
459 fsnotify_destroy_mark(&parent->mark);
a05fb6c @eparis audit: do not get and put just to free a watch
eparis authored Dec 18, 2009
460 audit_put_parent(parent);
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
461 }
462 }
463 }
464
7b0a04f @eparis fsnotify: provide the data type to should_send_event
eparis authored Dec 17, 2009
465 static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode,
1968f5e @eparis fanotify: use both marks when possible
eparis authored Jul 28, 2010
466 struct fsnotify_mark *inode_mark,
ce8f76f @eparis fsnotify: pass both the vfsmount mark and inode mark
eparis authored Jul 28, 2010
467 struct fsnotify_mark *vfsmount_mark,
3a9b16b @eparis fsnotify: send fsnotify_mark to groups in event handling functions
eparis authored Jul 28, 2010
468 __u32 mask, void *data, int data_type)
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
469 {
2612abb @eparis fsnotify: cleanup should_send_event
eparis authored Jul 28, 2010
470 return true;
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
471 }
472
473 /* Update watch data in audit rules based on fsnotify events. */
3a9b16b @eparis fsnotify: send fsnotify_mark to groups in event handling functions
eparis authored Jul 28, 2010
474 static int audit_watch_handle_event(struct fsnotify_group *group,
ce8f76f @eparis fsnotify: pass both the vfsmount mark and inode mark
eparis authored Jul 28, 2010
475 struct fsnotify_mark *inode_mark,
476 struct fsnotify_mark *vfsmount_mark,
3a9b16b @eparis fsnotify: send fsnotify_mark to groups in event handling functions
eparis authored Jul 28, 2010
477 struct fsnotify_event *event)
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
478 {
479 struct inode *inode;
480 __u32 mask = event->mask;
481 const char *dname = event->file_name;
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
482 struct audit_parent *parent;
483
ce8f76f @eparis fsnotify: pass both the vfsmount mark and inode mark
eparis authored Jul 28, 2010
484 parent = container_of(inode_mark, struct audit_parent, mark);
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
485
4cd76a4 @eparis audit: use the mark in handler functions
eparis authored Jul 28, 2010
486 BUG_ON(group != audit_watch_group);
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
487
488 switch (event->data_type) {
2069601 @torvalds Revert "fsnotify: store struct file not struct path"
authored Aug 12, 2010
489 case (FSNOTIFY_EVENT_PATH):
490 inode = event->path.dentry->d_inode;
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
491 break;
492 case (FSNOTIFY_EVENT_INODE):
493 inode = event->inode;
494 break;
495 default:
496 BUG();
497 inode = NULL;
498 break;
499 };
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
500
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
501 if (mask & (FS_CREATE|FS_MOVED_TO) && inode)
ae7b8f4 @eparis Audit: clean up the audit_watch split
eparis authored Dec 18, 2009
502 audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
503 else if (mask & (FS_DELETE|FS_MOVED_FROM))
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
504 audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1);
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
505 else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF))
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
506 audit_remove_parent_watches(parent);
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
507
508 return 0;
509 }
510
511 static const struct fsnotify_ops audit_watch_fsnotify_ops = {
512 .should_send_event = audit_watch_should_send_event,
513 .handle_event = audit_watch_handle_event,
514 .free_group_priv = NULL,
e118e9c @eparis audit: redo audit watch locking and refcnt in light of fsnotify
eparis authored Dec 18, 2009
515 .freeing_mark = NULL,
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
516 .free_event_priv = NULL,
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
517 };
518
519 static int __init audit_watch_init(void)
520 {
0d2e2a1 @eparis fsnotify: drop mask argument from fsnotify_alloc_group
eparis authored Dec 17, 2009
521 audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops);
e9fd702 @eparis audit: convert audit watches to use fsnotify instead of inotify
eparis authored Dec 18, 2009
522 if (IS_ERR(audit_watch_group)) {
523 audit_watch_group = NULL;
524 audit_panic("cannot create audit fsnotify group");
525 }
cfcad62 @eparis audit: seperate audit inode watches into a subfile
eparis authored Jun 11, 2009
526 return 0;
527 }
1a3aedb @eparis Audit: audit watch init should not be before fsnotify init
eparis authored Dec 17, 2009
528 device_initcall(audit_watch_init);
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