linux-hardening - Re: [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT modules

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Date:   Wed, 27 Jan 2021 18:03:24 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Justin Forbes <jforbes@...hat.com>
Cc:     Greg KH <greg@...ah.com>, Josh Poimboeuf <jpoimboe@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-hardening@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ondrej Mosnacek <omosnace@...hat.com>
Subject: Re: [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT
 modules

On Tue, Jan 26, 2021 at 06:44:44AM -0600, Justin Forbes wrote:
> Support and enforce are 2 completely different things.  To shed a bit
> more light on this, the real issue that prompted this was breaking CI
> systems.  As we enabled gcc plugins in Fedora, and the toolchain folks
> went through 3 different snapshots of gcc 11 in a week. Any CI process
> that built an out of tree module failed. I don't think this is nearly
> as much of a concern for stable distros, as it is for CI in
> development cycles.

And the answer is trivial: don't build out of tree modules.