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

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Message-ID: <20210127184327.GA1755516@infradead.org>
Date:   Wed, 27 Jan 2021 18:43:27 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-hardening@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Justin Forbes <jforbes@...hat.com>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT
 modules

On Wed, Jan 27, 2021 at 12:38:56PM -0600, Josh Poimboeuf wrote:
> On Wed, Jan 27, 2021 at 06:02:15PM +0000, Christoph Hellwig wrote:
> > Please don't add all this garbage.  We only add infrastructure to the
> > kernel for what the kernel itself needs, not for weird out of tree
> > infrastructure.
> 
> This isn't new, the kernel already has the infrastructure for building
> out-of-tree modules.  It's widely used.  Are you suggesting we remove
> it?  Good luck with that...
> 
> Either it should be supported, or not.  Make the case either way.  But I
> can't understand why people are advocating to leave it half-broken.


It is not support as any kind of interface.  It is a little aid for
local development.  Adding any kond of complexities for out of tree
modules is a complete no-go.