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SubjectRe: Non-random RDRAND Re: [PATCH] x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h
On Thu, Aug 15, 2019 at 11:12:24AM -0400, Theodore Y. Ts'o wrote:
> On Thu, Aug 15, 2019 at 01:24:35AM +0200, Pavel Machek wrote:
> > Burn it with fire!
> >
> > I mean... people were afraid RDRAND would be backdoored, and you now
> > confirm ... it indeed _is_ backdoored? /., here's news for you!
>
> To be fair to AMD, I wouldn't call it a backdoor. Hanlon's razor is
> applicable here:
>
> "Never attribute to malice that which can be adequately
> explained by neglect."
>
> (Sometimes other words are used instead of neglect, but i'm trying to
> be nice.)
>
Is it worth setting up a quirk for the Excavator era cpus, that triggers
a call to rdseed on resume? Working under the assumption that calling
rdseed would kick the rdrand instruction back into gear.

Neil

>
> - Ted
>
> P.S. Also applicable:
>
> https://www.youtube.com/watch?v=XZxzJGgox_E
>

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