linux-kernel - Re: x86: AMD Zen2 ymm registers rolling back

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 22 Feb 2023 09:38:09 +0000
From:   Andrew Cooper <andrew.cooper3@...rix.com>
To:     Borislav Petkov <bp@...en8.de>, Tavis Ormandy <taviso@...il.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: x86: AMD Zen2 ymm registers rolling back

On 22/02/2023 9:14 am, Borislav Petkov wrote:
> On Wed, Feb 22, 2023 at 09:33:19AM +0100, Borislav Petkov wrote:
>> It probably doesn't matter all too much but which kernel are you running
>> this on?
>>
>> Latest and greatest I hope...
> Also, what does
>
> $ grep microcode /proc/cpuinfo | uniq
>
> say?

This sounds suspiciously like an errata which was fixed with a ucode
update last year.

Check that you are up to date with ucode.  If you are, perhaps the fix
needs another look at...

~Andrew