linux-kernel - Re: [PATCH] gcc-plugins: make it possible to disable CONFIG_GCC

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Message-ID: <201912301141.38C6F7E0@keescook>
Date:   Mon, 30 Dec 2019 11:41:44 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Emese Revfy <re.emese@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] gcc-plugins: make it possible to disable
 CONFIG_GCC_PLUGINS again

On Sat, Dec 14, 2019 at 05:56:34PM +0900, Masahiro Yamada wrote:
> On Fri, Dec 13, 2019 at 2:44 AM Kees Cook <keescook@...omium.org> wrote:
> >
> > On Thu, Dec 12, 2019 at 10:59:40AM +0100, Arnd Bergmann wrote:
> > > On Thu, Dec 12, 2019 at 5:52 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
> > > >
> > > > On Wed, Dec 11, 2019 at 10:40 PM Arnd Bergmann <arnd@...db.de> wrote:
> > > > >
> > > > > I noticed that randconfig builds with gcc no longer produce a lot of
> > > > > ccache hits, unlike with clang, and traced this back to plugins
> > > > > now being enabled unconditionally if they are supported.
> > > > >
> > > > > I am now working around this by adding
> > > > >
> > > > >    export CCACHE_COMPILERCHECK=/usr/bin/size -A %compiler%
> > > > >
> > > > > to my top-level Makefile. This changes the heuristic that ccache uses
> > > > > to determine whether the plugins are the same after a 'make clean'.
> > > > >
> > > > > However, it also seems that being able to just turn off the plugins is
> > > > > generally useful, at least for build testing it adds noticeable overhead
> > > > > but does not find a lot of bugs additional bugs, and may be easier for
> > > > > ccache users than my workaround.
> > > > >
> > > > > Fixes: 9f671e58159a ("security: Create "kernel hardening" config area")
> > > > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > > >
> > > > Reviewed-by: Masahiro Yamada <masahiroy@...nel.org>
> > >
> > > On Wed, Dec 11, 2019 at 2:59 PM Ard Biesheuvel
> > > <ard.biesheuvel@...aro.org> wrote:
> > > >Acked-by: Ard Biesheuvel <ardb@...nel.org>
> > >
> > > Thanks! Who would be the best person to pick up the patch?
> > > Should I send it to Andrew?
> >
> > Acked-by: Kees Cook <keescook@...omium.org>
> >
> > I can take it in my tree, or I'm happy to have Masahiro take it.
> >
> > --
> > Kees Cook
> 
> Kees,
> Please apply it to your tree.

Thanks, applied!

-- 
Kees Cook