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

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Message-ID: <4BAA3556.2040802@redhat.com>
Date:	Wed, 24 Mar 2010 17:52:54 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joro@...tes.org>
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 03/24/2010 05:50 PM, Joerg Roedel wrote:
> On Wed, Mar 24, 2010 at 05:43:31PM +0200, Avi Kivity wrote:
>    
>> On 03/24/2010 05:37 PM, Joerg Roedel wrote:
>>      
>>> Even better. So a guest which breaks out can't even access its own
>>> /sys/kvm/ directory. Perfect, it doesn't need that access anyway.
>>>        
>> But what security label does that directory have?  How can we make sure
>> that whoever needs access to those files, gets them?
>>
>> Automatically created objects don't work well with that model.  They're
>> simply missing information.
>>      
> If we go the /proc/<pid>/kvm way then the directory should probably
> inherit the label from /proc/<pid>/?
>    

That's a security policy.  The security people like their policies 
outside the kernel.

For example, they may want a label that allows a trace context to read 
the data, and also qemu itself for introspection.

> Same could be applied to /sys/kvm/guest/ if we decide for it. The VM is
> still bound to a single process with a /proc/<pid>  after all.
>    

Ditto.

-- 
error compiling committee.c: too many arguments to function

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