linux-kernel - Re: [regression/bisected] Add IBPB decreases performance in two times

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-next>] [day] [month] [year] [list]

Date:   Sun, 13 Aug 2023 13:14:25 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Cc:     Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        x86@...nel.org
Subject: Re: [regression/bisected] Add IBPB decreases performance in two times

On Sun, Aug 13, 2023 at 03:57:03PM +0500, Mikhail Gavrilov wrote:
> Sure, I checked and got the same results as on the kernel with reverted commits.
> I suppose when new BIOS update will release the kernel would use
> automatically path `spec_rstack_overflow=microcode` and all users who
> faced with this issue not needed add `spec_rstack_overflow=microcode`
> to their kernel command line, right?

No, you have to specify it explicitly. The default mitigation is still
safe RET.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette