linux-kernel - Re: Linux 3.6

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Message-ID: <20121003214929.107b3b48@pyramind.ukuu.org.uk>
Date:	Wed, 3 Oct 2012 21:49:29 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Kees Cook <kees@...flux.net>
Cc:	Nick Bowler <nbowler@...iptictech.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 3.6

On Wed, 3 Oct 2012 13:05:15 -0700
Kees Cook <kees@...flux.net> wrote:

> Hi Nick,
> 
> 3.6 introduced link restrictions:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=800179c9b8a1e796e441674776d11cd4c05d61d7
> 
> It sounds like you've got symlinks in a world-writable directory, and
> you're following those symlinks across mis-matched uids. You can either
> have the symlinks be owned by the directory owner, or you can turn off
> symlink restrictions in sysctl:
> 
> # echo 0 > /proc/sys/fs/protected_symlinks

Quite honestly that should be pushed for 3.6.1 as a default - ASAP.

Alan
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