linux-hardening - Re: [PATCH v5 02/27] x86/build: Remove RWX sections and align on 4KB

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Date:   Thu, 6 Apr 2023 13:42:00 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Evgeniy Baskov <baskov@...ras.ru>,
        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>,
        "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 02/27] x86/build: Remove RWX sections and align on 4KB

  Hi,

> > Currently paging is disabled in x86_32 in compressed kernel, so
> > protection is not applied anyways, but .init code was incorrectly
> > placed in non-executable ".data" segment. This should not change
> > anything meaningful in memory layout now, but might be required in case
> > memory protection will also be implemented in compressed kernel for
> > x86_32.
> 
> I highly doubt that - no one cares about 32-bit x86 anymore.

Indeed.  ia32 edk2 runs without paging even in latest tianocore/edk2,
and I don't expect that to change until ia32 support gets removed.

take care,
  Gerd