linux-hardening - Re: [PATCH v5 01/27] x86/boot: Align vmlinuz sections on page size

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Date:   Wed, 5 Apr 2023 19:13:33 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Evgeniy Baskov <baskov@...ras.ru>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        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>,
        Gerd Hoffmann <kraxel@...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 v5 01/27] x86/boot: Align vmlinuz sections on page size

On Tue, Mar 14, 2023 at 01:13:28PM +0300, Evgeniy Baskov wrote:
> To protect sections on page table level each section needs to be
> aligned on page size (4KB).

Protect against what?

> Set sections alignment in linker script for the kernel decompressor
> (boot/compressed/vmlinux.lds.S).

Do not talk about *what* the patch is doing in the commit message - that
should be obvious from the diff itself. Rather, concentrate on the *why*
it needs to be done.

> Also introduce symbols that can be used to reference compressed
> kernel blob section later in the later patches.

Introduce those with the respective patch that uses them. This one is
adding section alignment only and that's all that it should do.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette