From: Oleg Nesterov <oleg@redhat.com>
Date: Thu, 8 Aug 2013 16:55:32 +0000 (+0200)
Subject: userns: limit the maximum depth of user_namespace->parent chain
X-Git-Tag: v3.11-rc5~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8742f229b635bf1c1c84a3dfe5e47c814c20b5c8;p=pandora-kernel.git

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>
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