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

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Message-ID: <1df46f0fa7a2643d2d6ecf7262b61eea@ispras.ru>
Date:   Sun, 12 Mar 2023 15:10:37 +0300
From:   Evgeniy Baskov <baskov@...ras.ru>
To:     Ard Biesheuvel <ardb@...nel.org>
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 2023-03-11 20:27, Ard Biesheuvel wrote:
> 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/

Thanks!