Re: Non-random RDRAND Re: [PATCH] x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h
From: Neil Horman
Date: Fri Aug 16 2019 - 10:43:38 EST
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.
> - Ted
> P.S. Also applicable: