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-rw-r--r--kernel/audit.h5
-rw-r--r--kernel/audit_watch.c27
-rw-r--r--kernel/auditfilter.c15
3 files changed, 23 insertions, 24 deletions
diff --git a/kernel/audit.h b/kernel/audit.h
index 704d5b0..bb1c0d6 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -109,10 +109,7 @@ extern dev_t audit_watch_dev(struct audit_watch *watch);
extern void audit_put_watch(struct audit_watch *watch);
extern void audit_get_watch(struct audit_watch *watch);
extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
-extern int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw);
-extern void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw);
-extern int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
- struct nameidata *ndw);
+extern int audit_add_watch(struct audit_krule *krule);
extern void audit_remove_watch(struct audit_watch *watch);
extern void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list);
extern void audit_inotify_unregister(struct list_head *in_list);
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index da8be6d..b49ab01 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -345,7 +345,7 @@ void audit_inotify_unregister(struct list_head *in_list)
}
/* Get path information necessary for adding watches. */
-int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw)
+static int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw)
{
struct nameidata *ndparent, *ndwatch;
int err;
@@ -380,7 +380,7 @@ int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw)
}
/* Release resources used for watch path information. */
-void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
+static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
{
if (ndp) {
path_put(&ndp->path);
@@ -426,14 +426,24 @@ static void audit_add_to_parent(struct audit_krule *krule,
/* Find a matching watch entry, or add this one.
* Caller must hold audit_filter_mutex. */
-int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
- struct nameidata *ndw)
+int audit_add_watch(struct audit_krule *krule)
{
struct audit_watch *watch = krule->watch;
struct inotify_watch *i_watch;
struct audit_parent *parent;
+ struct nameidata *ndp = NULL, *ndw = NULL;
int ret = 0;
+ mutex_unlock(&audit_filter_mutex);
+
+ /* Avoid calling path_lookup under audit_filter_mutex. */
+ ret = audit_get_nd(watch->path, &ndp, &ndw);
+ if (ret) {
+ /* caller expects mutex locked */
+ mutex_lock(&audit_filter_mutex);
+ goto error;
+ }
+
/* update watch filter fields */
if (ndw) {
watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev;
@@ -445,15 +455,14 @@ int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
* inotify watch is found, inotify_find_watch() grabs a reference before
* returning.
*/
- mutex_unlock(&audit_filter_mutex);
-
if (inotify_find_watch(audit_ih, ndp->path.dentry->d_inode,
&i_watch) < 0) {
parent = audit_init_parent(ndp);
if (IS_ERR(parent)) {
/* caller expects mutex locked */
mutex_lock(&audit_filter_mutex);
- return PTR_ERR(parent);
+ ret = PTR_ERR(parent);
+ goto error;
}
} else
parent = container_of(i_watch, struct audit_parent, wdata);
@@ -468,7 +477,11 @@ int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
/* match get in audit_init_parent or inotify_find_watch */
put_inotify_watch(&parent->wdata);
+
+error:
+ audit_put_nd(ndp, ndw); /* NULL args OK */
return ret;
+
}
void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list)
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 9d4c934..21b6235 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -864,7 +864,6 @@ static inline int audit_add_rule(struct audit_entry *entry)
struct audit_entry *e;
struct audit_watch *watch = entry->rule.watch;
struct audit_tree *tree = entry->rule.tree;
- struct nameidata *ndp = NULL, *ndw = NULL;
struct list_head *list;
int h, err;
#ifdef CONFIG_AUDITSYSCALL
@@ -878,8 +877,8 @@ static inline int audit_add_rule(struct audit_entry *entry)
mutex_lock(&audit_filter_mutex);
e = audit_find_rule(entry, &list);
- mutex_unlock(&audit_filter_mutex);
if (e) {
+ mutex_unlock(&audit_filter_mutex);
err = -EEXIST;
/* normally audit_add_tree_rule() will free it on failure */
if (tree)
@@ -887,17 +886,9 @@ static inline int audit_add_rule(struct audit_entry *entry)
goto error;
}
- /* Avoid calling path_lookup under audit_filter_mutex. */
- if (watch) {
- err = audit_get_nd(audit_watch_path(watch), &ndp, &ndw);
- if (err)
- goto error;
- }
-
- mutex_lock(&audit_filter_mutex);
if (watch) {
/* audit_filter_mutex is dropped and re-taken during this call */
- err = audit_add_watch(&entry->rule, ndp, ndw);
+ err = audit_add_watch(&entry->rule);
if (err) {
mutex_unlock(&audit_filter_mutex);
goto error;
@@ -942,11 +933,9 @@ static inline int audit_add_rule(struct audit_entry *entry)
#endif
mutex_unlock(&audit_filter_mutex);
- audit_put_nd(ndp, ndw); /* NULL args OK */
return 0;
error:
- audit_put_nd(ndp, ndw); /* NULL args OK */
if (watch)
audit_put_watch(watch); /* tmp watch, matches initial get */
return err;
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