Date: Fri, 17 Jan 2020 14:50:33 +0000 From: John Haxby <john.haxby@...cle.com> To: oss-security@...ts.openwall.com Subject: Re: Some AMD cpus with RDRAND fail to produce random numbers after suspend/resume > On 17 Jan 2020, at 08:10, Sven Schwedas <sven.schwedas@....at> wrote: > > On 17.01.20 05:21, Jeffrey Walton wrote: >> I agree with Lennart Poettering. This seems CVE worthy given RDRAND is >> often used to get the kernel generator (and other userland generators) >> in good working order. > > From my understanding it's harmless as far as linux's kernel generator > is concerned, as it's just xor'd to other entropy sources? > > CVEs should only be needed on a case-by-case basis for userland > generators that aren't properly engineered. Actually, the kernel does use rdrand directly for cases where a strong CPRNG not required. Whether some of those cases result in an exploitable bug I wouldn't like to say. jch Download attachment "signature.asc" of type "application/pgp-signature" (269 bytes)
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