linux-kernel - Re: [PATCH] kbuild: rebuild GCC plugins when the compiler is upgraded

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Message-ID: <20210305022500.cyi3cfwgt2t6mona@treble>
Date:   Thu, 4 Mar 2021 20:25:00 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-hardening@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: rebuild GCC plugins when the compiler is upgraded

On Thu, Mar 04, 2021 at 03:37:14PM -0800, Linus Torvalds wrote:
> On Thu, Mar 4, 2021 at 3:20 PM Kees Cook <keescook@...omium.org> wrote:
> >
> > This seems fine to me, but I want to make sure Josh has somewhere to
> > actually go with this. Josh, does this get you any closer?

No, this doesn't seem to help me at all.

> > It sounds like the plugins need to move to another location for
> > packaged kernels?
> 
> Well, it might be worth extending the stuff that gets installed with
> /lib/modules/<kernel-version>/ with enough information and
> infrastruvcture to then build any external modules.

The gcc plugins live in scripts/, which get installed by "make
modules_install" already.  So the plugins' source and makefiles are in
/lib/modules/<kernel-version>/build/scripts/gcc-plugins.

So everything needed for building the plugins is already there.  We just
need the kernel makefiles to rebuild the plugins locally, when building
an external module.

-- 
Josh