linux-kernel - Re: [PATCH] Forbid invocation of kexec_load() outside initial PID namespace

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Message-ID: <20120803125210.GD12870@redhat.com>
Date:	Fri, 3 Aug 2012 13:52:10 +0100
From:	"Daniel P. Berrange" <berrange@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH] Forbid invocation of kexec_load() outside initial PID
 namespace

On Fri, Aug 03, 2012 at 05:45:40AM -0700, Eric W. Biederman wrote:
> The solution is to use user namespaces and to only test ns_capable on the magic reboot path.
> 
> For the 3.7 timeframe that should be a realistic solution.

Hmm, that would imply that if LXC wants to allow reboot()/CAP_SYS_BOOT
they will be forced to use CLONE_NEWUSER. I was rather looking for a way
to allow the container to keep CAP_SYS_BOOT, without also mandating use
of user namespaces.

Regards,
Daniel
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