blob: 62d686d965813aeb4b8ef34877e886e08bd71912 [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
Mateusz Guzik5efc2442016-08-23 16:20:39 +020022#include <linux/file.h>
Eric Pariscfcad622009-06-11 14:31:36 -040023#include <linux/kernel.h>
24#include <linux/audit.h>
25#include <linux/kthread.h>
26#include <linux/mutex.h>
27#include <linux/fs.h>
Eric Parise9fd7022009-12-17 20:12:04 -050028#include <linux/fsnotify_backend.h>
Eric Pariscfcad622009-06-11 14:31:36 -040029#include <linux/namei.h>
30#include <linux/netlink.h>
Elena Reshetovabd120de2017-05-02 10:16:05 -040031#include <linux/refcount.h>
Eric Pariscfcad622009-06-11 14:31:36 -040032#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Eric Pariscfcad622009-06-11 14:31:36 -040034#include <linux/security.h>
35#include "audit.h"
36
37/*
38 * Reference counting:
39 *
Eric Parise9fd7022009-12-17 20:12:04 -050040 * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED
Eric Pariscfcad622009-06-11 14:31:36 -040041 * event. Each audit_watch holds a reference to its associated parent.
42 *
43 * audit_watch: if added to lists, lifetime is from audit_init_watch() to
44 * audit_remove_watch(). Additionally, an audit_watch may exist
45 * temporarily to assist in searching existing filter data. Each
46 * audit_krule holds a reference to its associated watch.
47 */
48
49struct audit_watch {
Elena Reshetovabd120de2017-05-02 10:16:05 -040050 refcount_t count; /* reference count */
Eric Pariscfcad622009-06-11 14:31:36 -040051 dev_t dev; /* associated superblock device */
Eric Parise08b0612009-08-07 16:54:23 -040052 char *path; /* insertion path */
Eric Pariscfcad622009-06-11 14:31:36 -040053 unsigned long ino; /* associated inode number */
54 struct audit_parent *parent; /* associated parent */
55 struct list_head wlist; /* entry in parent->watches list */
Eric Parisae7b8f42009-12-17 20:12:04 -050056 struct list_head rules; /* anchor for krule->rlist */
Eric Pariscfcad622009-06-11 14:31:36 -040057};
58
59struct audit_parent {
Eric Parisae7b8f42009-12-17 20:12:04 -050060 struct list_head watches; /* anchor for audit_watch->wlist */
Eric Parise61ce862009-12-17 21:24:24 -050061 struct fsnotify_mark mark; /* fsnotify mark on the inode */
Eric Pariscfcad622009-06-11 14:31:36 -040062};
63
Eric Parise9fd7022009-12-17 20:12:04 -050064/* fsnotify handle. */
Stephen Hemmingerb8800aa2010-10-20 17:23:50 -070065static struct fsnotify_group *audit_watch_group;
Eric Pariscfcad622009-06-11 14:31:36 -040066
Eric Parise9fd7022009-12-17 20:12:04 -050067/* fsnotify events we care about. */
68#define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\
69 FS_MOVE_SELF | FS_EVENT_ON_CHILD)
Eric Pariscfcad622009-06-11 14:31:36 -040070
Eric Parisae7b8f42009-12-17 20:12:04 -050071static void audit_free_parent(struct audit_parent *parent)
72{
73 WARN_ON(!list_empty(&parent->watches));
74 kfree(parent);
75}
76
Eric Parise61ce862009-12-17 21:24:24 -050077static void audit_watch_free_mark(struct fsnotify_mark *entry)
Eric Pariscfcad622009-06-11 14:31:36 -040078{
79 struct audit_parent *parent;
80
Eric Parise9fd7022009-12-17 20:12:04 -050081 parent = container_of(entry, struct audit_parent, mark);
Eric Parisae7b8f42009-12-17 20:12:04 -050082 audit_free_parent(parent);
Eric Pariscfcad622009-06-11 14:31:36 -040083}
84
Eric Parise9fd7022009-12-17 20:12:04 -050085static void audit_get_parent(struct audit_parent *parent)
86{
87 if (likely(parent))
88 fsnotify_get_mark(&parent->mark);
89}
90
91static void audit_put_parent(struct audit_parent *parent)
92{
93 if (likely(parent))
94 fsnotify_put_mark(&parent->mark);
95}
96
97/*
98 * Find and return the audit_parent on the given inode. If found a reference
99 * is taken on this parent.
100 */
101static inline struct audit_parent *audit_find_parent(struct inode *inode)
102{
103 struct audit_parent *parent = NULL;
Eric Parise61ce862009-12-17 21:24:24 -0500104 struct fsnotify_mark *entry;
Eric Parise9fd7022009-12-17 20:12:04 -0500105
Jan Karab1362ed2016-12-21 16:28:45 +0100106 entry = fsnotify_find_mark(&inode->i_fsnotify_marks, audit_watch_group);
Eric Parise9fd7022009-12-17 20:12:04 -0500107 if (entry)
108 parent = container_of(entry, struct audit_parent, mark);
109
110 return parent;
111}
112
Eric Pariscfcad622009-06-11 14:31:36 -0400113void audit_get_watch(struct audit_watch *watch)
114{
Elena Reshetovabd120de2017-05-02 10:16:05 -0400115 refcount_inc(&watch->count);
Eric Pariscfcad622009-06-11 14:31:36 -0400116}
117
118void audit_put_watch(struct audit_watch *watch)
119{
Elena Reshetovabd120de2017-05-02 10:16:05 -0400120 if (refcount_dec_and_test(&watch->count)) {
Eric Pariscfcad622009-06-11 14:31:36 -0400121 WARN_ON(watch->parent);
122 WARN_ON(!list_empty(&watch->rules));
123 kfree(watch->path);
124 kfree(watch);
125 }
126}
127
Stephen Hemmingerb8800aa2010-10-20 17:23:50 -0700128static void audit_remove_watch(struct audit_watch *watch)
Eric Pariscfcad622009-06-11 14:31:36 -0400129{
130 list_del(&watch->wlist);
Eric Parise9fd7022009-12-17 20:12:04 -0500131 audit_put_parent(watch->parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400132 watch->parent = NULL;
133 audit_put_watch(watch); /* match initial get */
134}
135
136char *audit_watch_path(struct audit_watch *watch)
137{
138 return watch->path;
139}
140
Eric Parisae7b8f42009-12-17 20:12:04 -0500141int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev)
Eric Pariscfcad622009-06-11 14:31:36 -0400142{
Richard Guy Briggs84cb7772015-08-05 23:48:20 -0400143 return (watch->ino != AUDIT_INO_UNSET) &&
Eric Parisae7b8f42009-12-17 20:12:04 -0500144 (watch->ino == ino) &&
145 (watch->dev == dev);
Eric Pariscfcad622009-06-11 14:31:36 -0400146}
147
148/* Initialize a parent watch entry. */
Al Viro15a91552011-02-16 15:08:54 -0500149static struct audit_parent *audit_init_parent(struct path *path)
Eric Pariscfcad622009-06-11 14:31:36 -0400150{
David Howells3b362152015-03-17 22:26:21 +0000151 struct inode *inode = d_backing_inode(path->dentry);
Eric Pariscfcad622009-06-11 14:31:36 -0400152 struct audit_parent *parent;
Eric Parise9fd7022009-12-17 20:12:04 -0500153 int ret;
Eric Pariscfcad622009-06-11 14:31:36 -0400154
155 parent = kzalloc(sizeof(*parent), GFP_KERNEL);
156 if (unlikely(!parent))
157 return ERR_PTR(-ENOMEM);
158
159 INIT_LIST_HEAD(&parent->watches);
Eric Pariscfcad622009-06-11 14:31:36 -0400160
Jan Kara054c6362016-12-21 18:06:12 +0100161 fsnotify_init_mark(&parent->mark, audit_watch_group);
Eric Parise9fd7022009-12-17 20:12:04 -0500162 parent->mark.mask = AUDIT_FS_WATCH;
Jan Kara7b1293232016-12-21 18:32:48 +0100163 ret = fsnotify_add_mark(&parent->mark, inode, NULL, 0);
Eric Parise9fd7022009-12-17 20:12:04 -0500164 if (ret < 0) {
Eric Parisae7b8f42009-12-17 20:12:04 -0500165 audit_free_parent(parent);
Eric Parise9fd7022009-12-17 20:12:04 -0500166 return ERR_PTR(ret);
Eric Pariscfcad622009-06-11 14:31:36 -0400167 }
168
169 return parent;
170}
171
172/* Initialize a watch entry. */
173static struct audit_watch *audit_init_watch(char *path)
174{
175 struct audit_watch *watch;
176
177 watch = kzalloc(sizeof(*watch), GFP_KERNEL);
178 if (unlikely(!watch))
179 return ERR_PTR(-ENOMEM);
180
181 INIT_LIST_HEAD(&watch->rules);
Elena Reshetovabd120de2017-05-02 10:16:05 -0400182 refcount_set(&watch->count, 1);
Eric Pariscfcad622009-06-11 14:31:36 -0400183 watch->path = path;
Richard Guy Briggs84cb7772015-08-05 23:48:20 -0400184 watch->dev = AUDIT_DEV_UNSET;
185 watch->ino = AUDIT_INO_UNSET;
Eric Pariscfcad622009-06-11 14:31:36 -0400186
187 return watch;
188}
189
Wei Yuanfd976462016-02-06 15:39:47 +0800190/* Translate a watch string to kernel representation. */
Eric Pariscfcad622009-06-11 14:31:36 -0400191int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op)
192{
193 struct audit_watch *watch;
194
Eric Parise9fd7022009-12-17 20:12:04 -0500195 if (!audit_watch_group)
Eric Pariscfcad622009-06-11 14:31:36 -0400196 return -EOPNOTSUPP;
197
198 if (path[0] != '/' || path[len-1] == '/' ||
199 krule->listnr != AUDIT_FILTER_EXIT ||
200 op != Audit_equal ||
201 krule->inode_f || krule->watch || krule->tree)
202 return -EINVAL;
203
204 watch = audit_init_watch(path);
205 if (IS_ERR(watch))
206 return PTR_ERR(watch);
207
Eric Pariscfcad622009-06-11 14:31:36 -0400208 krule->watch = watch;
209
210 return 0;
211}
212
213/* Duplicate the given audit watch. The new watch's rules list is initialized
214 * to an empty list and wlist is undefined. */
215static struct audit_watch *audit_dupe_watch(struct audit_watch *old)
216{
217 char *path;
218 struct audit_watch *new;
219
220 path = kstrdup(old->path, GFP_KERNEL);
221 if (unlikely(!path))
222 return ERR_PTR(-ENOMEM);
223
224 new = audit_init_watch(path);
225 if (IS_ERR(new)) {
226 kfree(path);
227 goto out;
228 }
229
230 new->dev = old->dev;
231 new->ino = old->ino;
Eric Parise9fd7022009-12-17 20:12:04 -0500232 audit_get_parent(old->parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400233 new->parent = old->parent;
234
235out:
236 return new;
237}
238
239static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op)
240{
241 if (audit_enabled) {
242 struct audit_buffer *ab;
243 ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE);
Kees Cook0644ec02013-01-11 14:32:07 -0800244 if (unlikely(!ab))
245 return;
Steve Grubbc1e8f062016-11-16 16:14:33 -0500246 audit_log_format(ab, "auid=%u ses=%u op=%s",
Eric W. Biedermane1760bd2012-09-10 22:39:43 -0700247 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Steve Grubbc1e8f062016-11-16 16:14:33 -0500248 audit_get_sessionid(current), op);
Eric Pariscfcad622009-06-11 14:31:36 -0400249 audit_log_format(ab, " path=");
250 audit_log_untrustedstring(ab, w->path);
Eric Paris9d960982009-06-11 14:31:37 -0400251 audit_log_key(ab, r->filterkey);
Eric Pariscfcad622009-06-11 14:31:36 -0400252 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. */
258static 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);
Eric Parisae7b8f42009-12-17 20:12:04 -0500267 /* Run all of the watches on this parent looking for the one that
268 * matches the given dname */
Eric Pariscfcad622009-06-11 14:31:36 -0400269 list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
Jeff Laytone3d6b072012-10-10 15:25:25 -0400270 if (audit_compare_dname_path(dname, owatch->path,
271 AUDIT_NAME_FULL))
Eric Pariscfcad622009-06-11 14:31:36 -0400272 continue;
273
274 /* If the update involves invalidating rules, do the inode-based
275 * filtering now, so we don't omit records. */
Eric Parisae7b8f42009-12-17 20:12:04 -0500276 if (invalidating && !audit_dummy_context())
Eric Pariscfcad622009-06-11 14:31:36 -0400277 audit_filter_inodes(current, current->audit_context);
278
Eric Parisae7b8f42009-12-17 20:12:04 -0500279 /* updating ino will likely change which audit_hash_list we
280 * are on so we need a new watch for the new list */
Eric Pariscfcad622009-06-11 14:31:36 -0400281 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
Eric Parisae7b8f42009-12-17 20:12:04 -0500296 nentry = audit_dupe_rule(&oentry->rule);
Eric Pariscfcad622009-06-11 14:31:36 -0400297 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);
Eric Parisae7b8f42009-12-17 20:12:04 -0500302
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;
Eric Pariscfcad622009-06-11 14:31:36 -0400311 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 }
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400316 if (oentry->rule.exe)
317 audit_remove_mark(oentry->rule.exe);
Eric Pariscfcad622009-06-11 14:31:36 -0400318
Burn Altinge7df61f2014-04-04 16:00:38 +1100319 audit_watch_log_rule_change(r, owatch, "updated_rules");
Eric Pariscfcad622009-06-11 14:31:36 -0400320
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
330add_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. */
337static 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);
Eric Pariscfcad622009-06-11 14:31:36 -0400344 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);
Burn Altinge7df61f2014-04-04 16:00:38 +1100347 audit_watch_log_rule_change(r, w, "remove_rule");
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400348 if (e->rule.exe)
349 audit_remove_mark(e->rule.exe);
Eric Pariscfcad622009-06-11 14:31:36 -0400350 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);
Eric Parise9fd7022009-12-17 20:12:04 -0500358
Lino Sanfilippoe2a29942011-06-14 17:29:51 +0200359 fsnotify_destroy_mark(&parent->mark, audit_watch_group);
Eric Pariscfcad622009-06-11 14:31:36 -0400360}
361
Eric Pariscfcad622009-06-11 14:31:36 -0400362/* Get path information necessary for adding watches. */
Al Viro15a91552011-02-16 15:08:54 -0500363static int audit_get_nd(struct audit_watch *watch, struct path *parent)
Eric Pariscfcad622009-06-11 14:31:36 -0400364{
Al Viro79714f72012-06-15 03:01:42 +0400365 struct dentry *d = kern_path_locked(watch->path, parent);
366 if (IS_ERR(d))
Al Viro15a91552011-02-16 15:08:54 -0500367 return PTR_ERR(d);
Al Viro59551022016-01-22 15:40:57 -0500368 inode_unlock(d_backing_inode(parent->dentry));
David Howells3b362152015-03-17 22:26:21 +0000369 if (d_is_positive(d)) {
Al Viro15a91552011-02-16 15:08:54 -0500370 /* update watch filter fields */
Al Virofc640052016-04-10 01:33:30 -0400371 watch->dev = d->d_sb->s_dev;
David Howells3b362152015-03-17 22:26:21 +0000372 watch->ino = d_backing_inode(d)->i_ino;
Al Viro15a91552011-02-16 15:08:54 -0500373 }
Al Viro15a91552011-02-16 15:08:54 -0500374 dput(d);
Eric Pariscfcad622009-06-11 14:31:36 -0400375 return 0;
376}
377
Eric Parise9fd7022009-12-17 20:12:04 -0500378/* Associate the given rule with an existing parent.
Eric Pariscfcad622009-06-11 14:31:36 -0400379 * Caller must hold audit_filter_mutex. */
380static 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
Eric Parise9fd7022009-12-17 20:12:04 -0500386 BUG_ON(!mutex_is_locked(&audit_filter_mutex));
387
Eric Pariscfcad622009-06-11 14:31:36 -0400388 list_for_each_entry(w, &parent->watches, wlist) {
389 if (strcmp(watch->path, w->path))
390 continue;
391
392 watch_found = 1;
393
Richard Guy Briggsf8259b22015-08-01 15:41:12 -0400394 /* put krule's ref to temporary watch */
Eric Pariscfcad622009-06-11 14:31:36 -0400395 audit_put_watch(watch);
396
397 audit_get_watch(w);
398 krule->watch = watch = w;
Richard Guy Briggsaa7c0432015-08-01 15:41:13 -0400399
400 audit_put_parent(parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400401 break;
402 }
403
404 if (!watch_found) {
Eric Pariscfcad622009-06-11 14:31:36 -0400405 watch->parent = parent;
406
Richard Guy Briggsf8259b22015-08-01 15:41:12 -0400407 audit_get_watch(watch);
Eric Pariscfcad622009-06-11 14:31:36 -0400408 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. */
Eric Parisae7b8f42009-12-17 20:12:04 -0500415int audit_add_watch(struct audit_krule *krule, struct list_head **list)
Eric Pariscfcad622009-06-11 14:31:36 -0400416{
417 struct audit_watch *watch = krule->watch;
Eric Pariscfcad622009-06-11 14:31:36 -0400418 struct audit_parent *parent;
Al Viro15a91552011-02-16 15:08:54 -0500419 struct path parent_path;
Eric Parisae7b8f42009-12-17 20:12:04 -0500420 int h, ret = 0;
Eric Pariscfcad622009-06-11 14:31:36 -0400421
Eric Paris35fe4d02009-06-11 14:31:36 -0400422 mutex_unlock(&audit_filter_mutex);
423
424 /* Avoid calling path_lookup under audit_filter_mutex. */
Al Viro15a91552011-02-16 15:08:54 -0500425 ret = audit_get_nd(watch, &parent_path);
Eric Paris35fe4d02009-06-11 14:31:36 -0400426
Al Viro15a91552011-02-16 15:08:54 -0500427 /* caller expects mutex locked */
Eric Parise118e9c2009-12-17 20:12:04 -0500428 mutex_lock(&audit_filter_mutex);
429
Al Viro15a91552011-02-16 15:08:54 -0500430 if (ret)
431 return ret;
Eric Pariscfcad622009-06-11 14:31:36 -0400432
Eric Parise118e9c2009-12-17 20:12:04 -0500433 /* either find an old parent or attach a new one */
David Howells3b362152015-03-17 22:26:21 +0000434 parent = audit_find_parent(d_backing_inode(parent_path.dentry));
Eric Parise9fd7022009-12-17 20:12:04 -0500435 if (!parent) {
Al Viro15a91552011-02-16 15:08:54 -0500436 parent = audit_init_parent(&parent_path);
Eric Pariscfcad622009-06-11 14:31:36 -0400437 if (IS_ERR(parent)) {
Eric Paris35fe4d02009-06-11 14:31:36 -0400438 ret = PTR_ERR(parent);
439 goto error;
Eric Pariscfcad622009-06-11 14:31:36 -0400440 }
Eric Parise9fd7022009-12-17 20:12:04 -0500441 }
Eric Pariscfcad622009-06-11 14:31:36 -0400442
Eric Parise118e9c2009-12-17 20:12:04 -0500443 audit_add_to_parent(krule, parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400444
Eric Parisae7b8f42009-12-17 20:12:04 -0500445 h = audit_hash_ino((u32)watch->ino);
446 *list = &audit_inode_hash[h];
Eric Paris35fe4d02009-06-11 14:31:36 -0400447error:
Al Viro15a91552011-02-16 15:08:54 -0500448 path_put(&parent_path);
Eric Pariscfcad622009-06-11 14:31:36 -0400449 return ret;
Eric Pariscfcad622009-06-11 14:31:36 -0400450}
451
Eric Parisa05fb6c2009-12-17 20:12:05 -0500452void audit_remove_watch_rule(struct audit_krule *krule)
Eric Pariscfcad622009-06-11 14:31:36 -0400453{
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)) {
Eric Parise9fd7022009-12-17 20:12:04 -0500463 audit_get_parent(parent);
Lino Sanfilippoe2a29942011-06-14 17:29:51 +0200464 fsnotify_destroy_mark(&parent->mark, audit_watch_group);
Eric Parisa05fb6c2009-12-17 20:12:05 -0500465 audit_put_parent(parent);
Eric Pariscfcad622009-06-11 14:31:36 -0400466 }
467 }
468}
469
Eric Parise9fd7022009-12-17 20:12:04 -0500470/* Update watch data in audit rules based on fsnotify events. */
Eric Paris3a9b16b2010-07-28 10:18:38 -0400471static int audit_watch_handle_event(struct fsnotify_group *group,
Jan Kara7053aee2014-01-21 15:48:14 -0800472 struct inode *to_tell,
Eric Parisce8f76f2010-07-28 10:18:39 -0400473 struct fsnotify_mark *inode_mark,
474 struct fsnotify_mark *vfsmount_mark,
Al Viro3cd5eca2016-11-20 20:19:09 -0500475 u32 mask, const void *data, int data_type,
Jan Kara9385a842016-11-10 17:51:50 +0100476 const unsigned char *dname, u32 cookie,
477 struct fsnotify_iter_info *iter_info)
Eric Parise9fd7022009-12-17 20:12:04 -0500478{
Al Viro3cd5eca2016-11-20 20:19:09 -0500479 const struct inode *inode;
Eric Parise9fd7022009-12-17 20:12:04 -0500480 struct audit_parent *parent;
481
Eric Parisce8f76f2010-07-28 10:18:39 -0400482 parent = container_of(inode_mark, struct audit_parent, mark);
Eric Parise9fd7022009-12-17 20:12:04 -0500483
Eric Paris4cd76a42010-07-28 10:18:38 -0400484 BUG_ON(group != audit_watch_group);
Eric Parise9fd7022009-12-17 20:12:04 -0500485
Jan Kara7053aee2014-01-21 15:48:14 -0800486 switch (data_type) {
Linus Torvalds20696012010-08-12 14:23:04 -0700487 case (FSNOTIFY_EVENT_PATH):
Al Viro3cd5eca2016-11-20 20:19:09 -0500488 inode = d_backing_inode(((const struct path *)data)->dentry);
Eric Parise9fd7022009-12-17 20:12:04 -0500489 break;
490 case (FSNOTIFY_EVENT_INODE):
Al Viro3cd5eca2016-11-20 20:19:09 -0500491 inode = (const struct inode *)data;
Eric Parise9fd7022009-12-17 20:12:04 -0500492 break;
493 default:
494 BUG();
495 inode = NULL;
496 break;
Nicholas Mc Guire9aab4f42017-05-02 10:16:04 -0400497 }
Eric Parise9fd7022009-12-17 20:12:04 -0500498
499 if (mask & (FS_CREATE|FS_MOVED_TO) && inode)
500 audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
501 else if (mask & (FS_DELETE|FS_MOVED_FROM))
Richard Guy Briggs84cb7772015-08-05 23:48:20 -0400502 audit_update_watch(parent, dname, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1);
Eric Parise9fd7022009-12-17 20:12:04 -0500503 else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF))
504 audit_remove_parent_watches(parent);
Eric Parise9fd7022009-12-17 20:12:04 -0500505
506 return 0;
507}
508
Eric Parise9fd7022009-12-17 20:12:04 -0500509static const struct fsnotify_ops audit_watch_fsnotify_ops = {
Eric Parise9fd7022009-12-17 20:12:04 -0500510 .handle_event = audit_watch_handle_event,
Jan Kara054c6362016-12-21 18:06:12 +0100511 .free_mark = audit_watch_free_mark,
Eric Pariscfcad622009-06-11 14:31:36 -0400512};
513
514static int __init audit_watch_init(void)
515{
Eric Paris0d2e2a12009-12-17 21:24:22 -0500516 audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops);
Eric Parise9fd7022009-12-17 20:12:04 -0500517 if (IS_ERR(audit_watch_group)) {
518 audit_watch_group = NULL;
519 audit_panic("cannot create audit fsnotify group");
520 }
Eric Pariscfcad622009-06-11 14:31:36 -0400521 return 0;
522}
Eric Paris1a3aedb2009-12-17 20:12:06 -0500523device_initcall(audit_watch_init);
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400524
525int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old)
526{
527 struct audit_fsnotify_mark *audit_mark;
528 char *pathname;
529
530 pathname = kstrdup(audit_mark_path(old->exe), GFP_KERNEL);
531 if (!pathname)
532 return -ENOMEM;
533
534 audit_mark = audit_alloc_mark(new, pathname, strlen(pathname));
535 if (IS_ERR(audit_mark)) {
536 kfree(pathname);
537 return PTR_ERR(audit_mark);
538 }
539 new->exe = audit_mark;
540
541 return 0;
542}
543
544int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark)
545{
Richard Guy Briggs15ce4142015-08-08 10:20:25 -0400546 struct file *exe_file;
547 unsigned long ino;
548 dev_t dev;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400549
Mateusz Guzik5efc2442016-08-23 16:20:39 +0200550 exe_file = get_task_exe_file(tsk);
551 if (!exe_file)
552 return 0;
Al Viro45063092016-12-04 18:24:56 -0500553 ino = file_inode(exe_file)->i_ino;
554 dev = file_inode(exe_file)->i_sb->s_dev;
Mateusz Guzik5efc2442016-08-23 16:20:39 +0200555 fput(exe_file);
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400556 return audit_mark_compare(mark, ino, dev);
557}