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

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Message-ID: <CAMw=ZnSBv=R5A9Yn5n-N+_QMaaUipVGxEJA1JWv__S3z5MmHrA@mail.gmail.com>
Date:   Wed, 12 Jul 2023 21:16:50 +0100
From:   Luca Boccassi <bluca@...ian.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Daniel P. Berrangé <berrange@...hat.com>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>, lennart@...ttering.net,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.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>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2] x86/boot: add .sbat section to the bzImage

On Wed, 12 Jul 2023 at 21:01, Borislav Petkov <bp@...en8.de> wrote:
>
> On Wed, Jul 12, 2023 at 08:56:36PM +0100, Luca Boccassi wrote:
> > Everything < 3 is revoked _and_ the generation id in the stable branch
> > is _not_ bumped, because it's still vulnerable and so that branch is
> > effectively dead and unbootable on any system with secure boot
> > enabled. This is a revocation mechanism, not a bug tracking mechanism.
> > There's no mix-and-matching.
>
> No, this is a mess waiting to happen.

That's not very convincing. You are aware that this mechanism exists
and is already used by other EFI components, yes?

> > Nah, it belongs in both places. Please read the documentation and
> > spend at least some time trying to understand the actual problem being
>
> You want to have this patch in the tree - the commit message should
> explain why it is needed and not point to some documentation somewhere.

Then why not just ask for that, instead of making convoluted
assumptions based on nothing of substance?

> > solved before commenting - or don't comment at all, that's fine too.
>
> Here's a comment for ya:
>
> Naked-by: Borislav Petkov (AMD) <bp@...en8.de>

So very mature. No wonder kernel maintainers and the LKML are
universally loved and praised.