[lkml]   [2019]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [tip: x86/urgent] x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h
On Fri 2019-08-23 01:10:49, tip-bot2 for Tom Lendacky wrote:
> The following commit has been merged into the x86/urgent branch of tip:
> Commit-ID: c49a0a80137c7ca7d6ced4c812c9e07a949f6f24
> Gitweb:
> Author: Tom Lendacky <>
> AuthorDate: Mon, 19 Aug 2019 15:52:35
> Committer: Borislav Petkov <>
> CommitterDate: Mon, 19 Aug 2019 19:42:52 +02:00
> x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h
> There have been reports of RDRAND issues after resuming from suspend on
> some AMD family 15h and family 16h systems. This issue stems from a BIOS
> not performing the proper steps during resume to ensure RDRAND continues
> to function properly.

There are quite a few unanswered questions here.

a) Is there/should there be CVE for this?

b) Can we perform proper steps in kernel, thus making RDRAND usable
even when BIOS is buggy?

Best regards,

(cesky, pictures)
[unhandled content-type:application/pgp-signature]
 \ /
  Last update: 2019-08-24 20:19    [W:0.088 / U:1.336 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site