linux-kernel - Re: [PATCH v2] Yama: verify inode is symlink to avoid bind mounts

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Message-ID: <alpine.LRH.2.00.1007210901120.22161@tundra.namei.org>
Date:	Wed, 21 Jul 2010 09:01:24 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Kees Cook <kees.cook@...onical.com>
cc:	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Yama: verify inode is symlink to avoid bind mounts

On Tue, 13 Jul 2010, Kees Cook wrote:

> The inode_follow_link LSM hook is called in bind mount situations as
> well as for symlink situations, so we must explicitly check for the
> inode being a symlink to not reject bind mounts in 1777 directories,
> which seems to be a common NFSv4 configuration.
> 
> Signed-off-by: Kees Cook <kees.cook@...onical.com>
> ---
> v2:
>  - actually set inode in time to use it.  *face palm*

Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next


-- 
James Morris
<jmorris@...ei.org>
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