Re: [PATCH 1/1] virtio: rng: add derating factor for use by hwrng core

From: Amit Shah
Date: Tue Aug 12 2014 - 01:29:21 EST


On (Mon) 11 Aug 2014 [15:11:03], H. Peter Anvin wrote:
> On 08/11/2014 11:49 AM, Amit Shah wrote:
> > The khwrngd thread is started when a hwrng device of sufficient
> > quality is registered. The virtio-rng device is backed by the
> > hypervisor, and we trust the hypervisor to provide real entropy. A
> > malicious hypervisor is a scenario that's ruled out, so we are certain
> > the quality of randomness we receive is perfectly trustworthy. Hence,
> > we use 100% for the factor, indicating maximum confidence in the source.
> >
> > Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
>
> It isn't "ruled out", it is just irrelevant: if the hypervisor is
> malicious, the quality of your random number source is the least of your
> problems.

Yea; I meant ruled out in that sense. Should the commit msg be more
verbose?

Amit
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