linux-kernel - Re: [RFC PATCH v2] x86/boot: add .sbat section to the bzImage

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Message-ID: <20230714091310.GA21128@srcf.ucam.org>
Date:   Fri, 14 Jul 2023 10:13:10 +0100
From:   Matthew Garrett <mjg59@...f.ucam.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Luca Boccassi <bluca@...ian.org>, Peter Jones <pjones@...hat.com>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        lennart@...ttering.net, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Daniel P . Berrangé <berrange@...hat.com>,
        linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [RFC PATCH v2] x86/boot: add .sbat section to the bzImage

On Fri, Jul 14, 2023 at 10:52:20AM +0200, Ard Biesheuvel wrote:

> Maybe the OEMs have gotten better at this over the years, but it is
> definitely not possible for the distros to rely on being able to get
> their own cert into KEK and sign their builds directly.

Getting certs into local machine databases should[1] be possible on all 
Windows certified machines, but in the status-quo there's no 
cross-vendor solution to doing this. Relying on the Shim-provided 
mechanisms is much safer from a consistency perspective.

[1] Every time someone has claimed it's impossible to me I've ended up 
demonstrating otherwise, but that's not a guarantee