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fanotify: flush outstanding perm requests on group destroy

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When an fanotify listener is closing it may cause a deadlock between the
listener and the original task doing an fs operation.  If the original task
is waiting for a permissions response it will be holding the srcu lock.  The
listener cannot clean up and exit until after that srcu lock is syncronized.
Thus deadlock.  The fix introduced here is to stop accepting new permissions
events when a listener is shutting down and to grant permission for all
outstanding events.  Thus the original task will eventually release the srcu
lock and the listener can complete shutdown.

Reported-by: Andreas Gruenbacher <agruen@suse.de>
Cc: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2010-08-18 12:25:50 -04:00
parent 84e1ab4d87
commit 2eebf582c9
3 changed files with 28 additions and 7 deletions
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27
fs/notify/fanotify/fanotify_user.c
View file

@ -195,6 +195,14 @@ static int prepare_for_access_response(struct fsnotify_group *group,
re->fd = fd;
mutex_lock(&group->fanotify_data.access_mutex);
if (group->fanotify_data.bypass_perm) {
mutex_unlock(&group->fanotify_data.access_mutex);
kmem_cache_free(fanotify_response_event_cache, re);
event->response = FAN_ALLOW;
return 0;
}
list_add_tail(&re->list, &group->fanotify_data.access_list);
mutex_unlock(&group->fanotify_data.access_mutex);
@ -364,9 +372,28 @@ static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t
static int fanotify_release(struct inode *ignored, struct file *file)
{
struct fsnotify_group *group = file->private_data;
struct fanotify_response_event *re, *lre;
pr_debug("%s: file=%p group=%p\n", __func__, file, group);
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
mutex_lock(&group->fanotify_data.access_mutex);
group->fanotify_data.bypass_perm = true;
list_for_each_entry_safe(re, lre, &group->fanotify_data.access_list, list) {
pr_debug("%s: found group=%p re=%p event=%p\n", __func__, group,
re, re->event);
list_del_init(&re->list);
re->event->response = FAN_ALLOW;
kmem_cache_free(fanotify_response_event_cache, re);
}
mutex_unlock(&group->fanotify_data.access_mutex);
wake_up(&group->fanotify_data.access_waitq);
#endif
/* matches the fanotify_init->fsnotify_alloc_group */
fsnotify_put_group(group);

7
include/linux/fanotify.h
View file

@ -95,11 +95,4 @@ struct fanotify_response {
(long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
(long)(meta)->event_len <= (long)(len))
#ifdef __KERNEL__
struct fanotify_wait {
struct fsnotify_event *event;
__s32 fd;
};
#endif /* __KERNEL__ */
#endif /* _LINUX_FANOTIFY_H */

1
include/linux/fsnotify_backend.h
View file

@ -156,6 +156,7 @@ struct fsnotify_group {
struct mutex access_mutex;
struct list_head access_list;
wait_queue_head_t access_waitq;
bool bypass_perm; /* protected by access_mutex */
#endif /* CONFIG_FANOTIFY_ACCESS_PERMISSIONS */
int f_flags;
} fanotify_data;