tree 3d9f64cf0c9d705b9f422d137c8067fa2d41f3c8
parent 55f5bfd4c94b923d965d47f5c1889ef8f98fcef1
author Oleg Nesterov <oleg@redhat.com> 1375980932 +0200
committer Linus Torvalds <torvalds@linux-foundation.org> 1375992699 -0700

userns: limit the maximum depth of user_namespace->parent chain

Ensure that user_namespace->parent chain can't grow too much.
Currently we use the hardroded 32 as limit.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>