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

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Message-ID: <20210303214534.guyoxcwrgxgcqzy4@treble>
Date:   Wed, 3 Mar 2021 15:45:34 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Masahiro Yamada <masahiroy@...nel.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>,
        Justin Forbes <jforbes@...hat.com>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Frank Eigler <fche@...hat.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT
 modules

On Wed, Mar 03, 2021 at 12:56:52PM -0800, Linus Torvalds wrote:
> On Wed, Mar 3, 2021 at 12:24 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> >
> > Your nack is for a different reason: GCC plugins are second-class
> > citizens.  Fair enough...
> 
> MNo, I didn't NAK it. Quite the reverser.
> 
> I am ABSOLUTELY against rebuilding normal object files just because
> gcc versions change. A compiler version change makes zero difference
> for any normal object file.
> 
> But the gcc plugins are different. They very much _are_ tied to a
> particular gcc version.
> 
> Now, they are tied to a particular gcc version because they are
> horribly badly done, and bad technology, and I went off on a bit of a
> rant about just how bad they are, but the point is that gcc plugins
> depend on the exact gcc version in ways that normal object files do
> _not_.

Thanks, reading comprehension is hard.  I realized after re-reading that
I interpreted your "plugins should depend on the kernel version"
statement too broadly.

Masahiro, any idea how I can make the GCC version a build dependency?

-- 
Josh