Jan Kara d76036ab47 audit: Fix use after free in audit_remove_watch_rule()
audit_remove_watch_rule() drops watch's reference to parent but then
continues to work with it. That is not safe as parent can get freed once
we drop our reference. The following is a trivial reproducer:

mount -o loop image /mnt
touch /mnt/file
auditctl -w /mnt/file -p wax
umount /mnt
auditctl -D
<crash in fsnotify_destroy_mark()>

Grab our own reference in audit_remove_watch_rule() earlier to make sure
mark does not get freed under us.

CC: stable@vger.kernel.org
Reported-by: Tony Jones <tonyj@suse.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Tested-by: Tony Jones <tonyj@suse.de>
Signed-off-by: Paul Moore <paul@paul-moore.com>
2017-08-15 15:58:17 -04:00
..
2017-06-12 18:07:43 -04:00
2017-01-12 07:01:56 -07:00
2017-02-22 10:30:38 -08:00
2017-03-24 21:51:33 +08:00
2017-02-27 18:43:47 -08:00
2016-03-01 20:36:56 +01:00
2016-12-22 22:58:37 -05:00