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

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Date:   Fri, 21 Jul 2023 11:27:03 -0400
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Luca Boccassi <bluca@...ian.org>
Cc:     Eric Snowberg <eric.snowberg@...cle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        "Daniel P." Berrangé <berrange@...hat.com>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "lennart@...ttering.net" <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>,
        open list <linux-kernel@...r.kernel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        Jarkko Sakkinen <jarkko@...nel.org>
Subject: Re: [RFC PATCH v2] x86/boot: add .sbat section to the bzImage

On Fri, 2023-07-21 at 16:22 +0100, Luca Boccassi wrote:
> On Fri, 21 Jul 2023 at 16:14, Luca Boccassi <bluca@...ian.org> wrote:
[...]
> > Anyway, I wasn't aware that SUSE doesn't embed their cert in Shim,
> > we'll have to take that in consideration for sure.
> 
> Actually, a dev from SUSE's security just confirmed they embed their
> CA in Shim like every other distribution. Nobody seems to be aware of
> any example where a distribution relies exclusively on MoK - and
> that's understandable, as that would mean failing to boot by default
> on a new machine. Do you have any example/cases where that's actually
> happening? Outside development/local signing/etc.

It happened last year for an openSUSE Leap update that changed the
kernel signing certificate.  I got asked to confirm acceptance of the
new key and it got put in my MokList, which now has three certificates:
two suse ones and my own.

James