linux-hardening - Re: [PATCH v4 17/26] x86/boot: Reduce size of the DOS stub

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Message-ID: <CAMj1kXEySE_GuNx+xLPu9pvkZoA6Sph=7BZt-gzVCi4pD1COPA@mail.gmail.com>
Date:   Sat, 11 Mar 2023 18:27:48 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Evgeniy Baskov <baskov@...ras.ru>
Cc:     Borislav Petkov <bp@...en8.de>, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Peter Jones <pjones@...hat.com>,
        "Limonciello, Mario" <mario.limonciello@....com>,
        joeyli <jlee@...e.com>, lvc-project@...uxtesting.org,
        x86@...nel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v4 17/26] x86/boot: Reduce size of the DOS stub

On Sat, 11 Mar 2023 at 15:49, Evgeniy Baskov <baskov@...ras.ru> wrote:
>
> On 2023-03-10 17:59, Ard Biesheuvel wrote:
> > On Thu, 15 Dec 2022 at 13:40, Evgeniy Baskov <baskov@...ras.ru> wrote:
> >>
> >> This is required to fit more sections in PE section tables,
> >> since its size is restricted by zero page located at specific offset
> >> after the PE header.
> >>
> >> Tested-by: Mario Limonciello <mario.limonciello@....com>
> >> Tested-by: Peter Jones <pjones@...hat.com>
> >> Signed-off-by: Evgeniy Baskov <baskov@...ras.ru>
> >
> > I'd prefer to rip this out altogether.
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id=9510f6f04f579b9a3f54ad762c75ab2d905e37d8
>
> Sounds great! Can I replace this patch with yours in v5?
>

Of course.

> >
> > (and refer to the other thread in linux-efi@)
>
> Which thread exactly? The one about the removal of
> real-mode code?
>

Yes, this one

https://lore.kernel.org/linux-efi/20230308202209.2980947-1-ardb@kernel.org/