linux-kernel - Re: [ 109/171 ] userns: Dont allow creation if the user is chrooted

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Message-ID: <20131023093234.GA5968@hercules>
Date:	Wed, 23 Oct 2013 10:32:34 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, Serge Hallyn <serge.hallyn@...onical.com>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [ 109/171 ] userns: Dont allow creation if the user is chrooted

On Tue, Oct 22, 2013 at 10:45:45AM -0700, Eric W. Biederman wrote:
> Luis Henriques <luis.henriques@...onical.com> writes:
> 
> > On Thu, Apr 11, 2013 at 04:26:52PM -0400, Steven Rostedt wrote:
> >> 3.6.11.2 stable review patch.
> >> If anyone has any objections, please let me know.
> >> 
> >> ------------------
> >> 
> >> From: "Eric W. Biederman" <ebiederm@...ssion.com>
> >> 
> >> [ Upstream commit 3151527ee007b73a0ebd296010f1c0454a919c7d ]
> >
> > While looking at some security bugs, I came across this one
> > (CVE-2013-1956).  All the references I could find refer to the 3.8
> > kernel only, and this was the only backport I could find to older
> > stable kernels.
> >
> > Could someone clarify if this fix should be included in other stable
> > kernels?  Or the only affected kernels were the 3.8.0 to 3.8.5?
> 
> Strictly speaking there are older kernels affected.  I think it was 3.5
> that had my earliest user namespace bits, and this bug came in with the
> first of those bits.  However prior to 3.8 simply not enough things were
> converted for most people to build a kernel with user namespaces
> enabled.  I don't think distro's will have user namespaces enabled prior
> to 3.12 as that is when xfs the last hold out was finally converted.
> 
> Eric

That makes perfect sense to me.  Thanks a lot for the clarification,
Eric.

Cheers,
--
Luis
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