linux-kernel - Re: [PATCH] virtio: rng: add derating factor for use by hwrng core

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Message-ID: <53EBCF42.8040706@linux.intel.com>
Date:	Wed, 13 Aug 2014 13:49:06 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, Amos Kong <akong@...hat.com>,
	ricardo.neri-calderon@...ux.intel.com, tytso@....edu,
	Amit Shah <amit.shah@...hat.com>
Subject: Re: [PATCH] virtio: rng: add derating factor for use by hwrng core

On 08/13/2014 12:09 PM, Rusty Russell 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 irrelevant -- such a setup
> is bound to cause all sorts of badness, and a compromised hwrng is not
> the biggest threat.
> 
> Given this, 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@...hat.com>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> ---
> Pretty small and contained patch; would be great if it is picked up for
> 3.17.
> 
> v2: re-word commit msg
> 
> [Agreed, re-sending to Linus with SOB before jumping on plane]

Reviewed-by: H. Peter Anvin <hpa@...ux.intel.com>

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