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

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Message-ID: <20080517064307.GA16857@gondor.apana.org.au>
Date:	Sat, 17 May 2008 14:43:07 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Johannes Berg <johannes@...solutions.net>,
	virtualization@...ts.linux-foundation.org,
	Jeff Garzik <jeff@...zik.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Theodore Tso <tytso@....edu>, Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH 2/2] lguest: virtio-rng support

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.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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