linux-kernel - Re: [RFC] Unify KVM kernel-space and user-space code into a single project

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Date:	Wed, 24 Mar 2010 17:31:19 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	"Daniel P. Berrange" <berrange@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, ziteng.huang@...el.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single
	project

On Wed, Mar 24, 2010 at 06:20:38PM +0200, Avi Kivity wrote:
> On 03/24/2010 06:17 PM, Joerg Roedel wrote:
>> But is this not only one entity more for
>> sVirt to handle? I would leave that decision to the sVirt developers.
>> Does attaching the same label as for the VM resources mean that root
>> could not access it anymore?
>>    
>
> IIUC processes run under a context, and there's a policy somewhere that  
> tells you which context can access which label (and with what  
> permissions).  There was a server on the Internet once that gave you  
> root access and invited you to attack it.  No idea if anyone succeeded  
> or not (I got bored after about a minute).
>
> So it depends on the policy.  If you attach the same label, that means  
> all files with the same label have the same access permissions.  I think.

So if this is true we can introduce a 'trace' label and add all contexts
that should be allowed to trace to it.
But we probably should leave the details to the security experts ;-)

	Joerg

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