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Date:   Thu, 13 Aug 2020 10:36:05 +0200
From:   Ard Biesheuvel <>
To:     Peter Zijlstra <>
Cc:     Jessica Yu <>,
        Szabolcs Nagy <>,
        Will Deacon <>,
        Mauro Carvalho Chehab <>,
        Linux Kernel Mailing List <>,
        Thomas Gleixner <>,
        Kees Cook <>,
        Josh Poimboeuf <>,
        Miroslav Benes <>,
        Mark Rutland <>, nd <>
Subject: Re: [PATCH v2] module: Harden STRICT_MODULE_RWX

On Wed, 12 Aug 2020 at 22:00, Peter Zijlstra <> wrote:
> On Wed, Aug 12, 2020 at 06:37:57PM +0200, Ard Biesheuvel wrote:
> > I know there is little we can do at this point, apart from ignoring
> > the permissions - perhaps we should just defer the w^x check until
> > after calling module_frob_arch_sections()?
> My earlier suggestion was to ignore it for 0-sized sections.

Only they are 1 byte sections in this case.

We override the sh_type and sh_flags explicitly for these sections at
module load time, so deferring the check seems like a reasonable
alternative to me.

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