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

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Message-ID: <CAHk-=wi9J3mM8y+aH9e=HRo95giK4BRyyasayAimB0gdvbvDsQ@mail.gmail.com>
Date:   Wed, 3 Mar 2021 12:56:52 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
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 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_.

               Linus