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: https://git.kernel.org/tip/c49a0a80137c7ca7d6ced4c812c9e07a949f6f24 Author: Tom Lendacky thomas.lendacky@amd.com AuthorDate: Mon, 19 Aug 2019 15:52:35 Committer: Borislav Petkov bp@suse.de 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, Pavel