linux-kernel - Re: [PATCH 2/2] lguest: virtio-rng support

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Message-Id: <200805170943.54031.borntraeger@de.ibm.com>
Date:	Sat, 17 May 2008 09:43:53 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	"H. Peter Anvin" <hpa@...or.com>,
	Johannes Berg <johannes@...solutions.net>,
	virtualization@...ts.linux-foundation.org,
	Jeff Garzik <jeff@...zik.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Theodore Tso <tytso@....edu>, Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH 2/2] lguest: virtio-rng support

Am Samstag, 17. Mai 2008 schrieb Herbert Xu:
> On Sat, May 17, 2008 at 04:28:03PM +1000, Rusty Russell wrote:
> >
> > But you did not address the DoS question: can we ignore it?  Or are we 
trading 
> > off a DoS in the host against a potential security weakness in the guest?
> 
> Why not do both? Use the host's urandom to make the guest at least
> unpredictable on start-up without increasing the guest's entropy,
> and use the host's random to actually increase the guest's entropy.

I think the proper solution would be to use the hosts /dev/hw_rng - if 
available.
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