linux-kernel - Re: [PATCH] cpu/bugs: Disable CPU mitigations at compilation time

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]

Message-ID: <20230609173343.GDZINid4EgJGnkW7HK@fat_crate.local>
Date:   Fri, 9 Jun 2023 19:33:43 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Breno Leitao <leitao@...ian.org>
Cc:     tglx@...utronix.de, pawan.kumar.gupta@...ux.intel.com,
        paul@...l-moore.com, leit@...a.com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpu/bugs: Disable CPU mitigations at compilation time

On Fri, Feb 03, 2023 at 04:06:15AM -0800, Breno Leitao wrote:
> Right now it is not possible to disable CPU vulnerabilities mitigations
> at build time. Mitigation needs to be disabled passing kernel
> parameters, such as 'mitigations=off'.
> 
> Create a new config option (CONFIG_CPU_MITIGATIONS_DEFAULT_OFF) that
> sets the global variable `cpu_mitigations` to OFF, instead of AUTO. This
> allows the creation of kernel binaries that boots with the CPU
> mitigations turned off by default, and does not require dealing kernel
> parameters.

What's the real-life use case for this?

-- 
Regards/Gruss,
    Boris.

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