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| author | Jan Kara <jack@suse.cz> | 2017-08-15 13:00:36 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-24 17:02:35 -0700 |
| commit | ea088172692cbadddc4efcdae2a5dfe1693e8b20 (patch) | |
| tree | 1c93ef90178f4644afaf15d173cd992c1423e119 /mm/hugetlb_cgroup.c | |
| parent | b72f1119c654a2e3aeb41175ff94299a4ec01afb (diff) | |
audit: Fix use after free in audit_remove_watch_rule()
commit d76036ab47eafa6ce52b69482e91ca3ba337d6d6 upstream.
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.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/hugetlb_cgroup.c')
0 files changed, 0 insertions, 0 deletions