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Diffstat (limited to 'fs/notify/fanotify/fanotify.c')
-rw-r--r--fs/notify/fanotify/fanotify.c26
1 files changed, 23 insertions, 3 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index e5f7e47de68e..2fa99aeaa095 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -57,14 +57,26 @@ static int fanotify_merge(struct list_head *list, struct fsnotify_event *event)
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
static int fanotify_get_response(struct fsnotify_group *group,
- struct fanotify_perm_event_info *event)
+ struct fanotify_perm_event_info *event,
+ struct fsnotify_iter_info *iter_info)
{
int ret;
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
+ /*
+ * fsnotify_prepare_user_wait() fails if we race with mark deletion.
+ * Just let the operation pass in that case.
+ */
+ if (!fsnotify_prepare_user_wait(iter_info)) {
+ event->response = FAN_ALLOW;
+ goto out;
+ }
+
wait_event(group->fanotify_data.access_waitq, event->response);
+ fsnotify_finish_user_wait(iter_info);
+out:
/* userspace responded, convert to something usable */
switch (event->response) {
case FAN_ALLOW:
@@ -174,7 +186,8 @@ static int fanotify_handle_event(struct fsnotify_group *group,
struct fsnotify_mark *inode_mark,
struct fsnotify_mark *fanotify_mark,
u32 mask, const void *data, int data_type,
- const unsigned char *file_name, u32 cookie)
+ const unsigned char *file_name, u32 cookie,
+ struct fsnotify_iter_info *iter_info)
{
int ret = 0;
struct fanotify_event_info *event;
@@ -215,7 +228,8 @@ static int fanotify_handle_event(struct fsnotify_group *group,
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
if (mask & FAN_ALL_PERM_EVENTS) {
- ret = fanotify_get_response(group, FANOTIFY_PE(fsn_event));
+ ret = fanotify_get_response(group, FANOTIFY_PE(fsn_event),
+ iter_info);
fsnotify_destroy_event(group, fsn_event);
}
#endif
@@ -248,8 +262,14 @@ static void fanotify_free_event(struct fsnotify_event *fsn_event)
kmem_cache_free(fanotify_event_cachep, event);
}
+static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
+{
+ kmem_cache_free(fanotify_mark_cache, fsn_mark);
+}
+
const struct fsnotify_ops fanotify_fsnotify_ops = {
.handle_event = fanotify_handle_event,
.free_group_priv = fanotify_free_group_priv,
.free_event = fanotify_free_event,
+ .free_mark = fanotify_free_mark,
};