linux-kernel - Re: [PATCH v5] x86/mce: Check for writes ignored in MCA

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] [day] [month] [year] [list]

Message-ID: <02bba339-bf85-f178-c1b6-13d553c4a48c@amd.com>
Date:   Mon, 27 Jun 2022 13:57:38 -0700
From:   Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: Re: [PATCH v5] x86/mce: Check for writes ignored in MCA_STATUS
 register

On 6/25/2022 6:10 AM, Borislav Petkov wrote:
> On Fri, Jun 24, 2022 at 03:34:42PM -0700, Smita Koralahalli wrote:
>> The wrmsrl_safe() doesn't throw an error here.
>> I think we need to read back the written value and check for it whatsoever.
>> What do you think?
> Ah, that's the write-ignored thing. Not the #GP-generating thing when
> McStatusWrEn=0.
>
> Sorry, I got confused.
>
> Can you pls change that part back to reading the previously written
> value and send me a tested version?
>
> Thx.
Thanks, I have sent them.
>