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Date: Tue, 12 Aug 2014 07:59:32 -0700 From: "H. Peter Anvin" <hpa@...ux.intel.com> To: Amit Shah <amit.shah@...hat.com> CC: linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>, Virtualization List <virtualization@...ts.linux-foundation.org>, kvm list <kvm@...r.kernel.org>, jgarzik@...pay.com, duwe@....de, Amos Kong <akong@...hat.com>, ricardo.neri-calderon@...ux.intel.com, tytso@....edu, herbert@...dor.apana.org.au Subject: Re: [PATCH 1/1] virtio: rng: add derating factor for use by hwrng core On 08/11/2014 10:27 PM, Amit Shah wrote: > 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@...hat.com> >> >> 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? > Yes, as it is written it is misleading. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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