linux-kernel - Re: [PATCH v6 00/29] Warn on orphan section placement

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Message-ID: <202009011616.E6DC7D54EF@keescook>
Date:   Tue, 1 Sep 2020 16:18:05 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>,
        James Morse <james.morse@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 00/29] Warn on orphan section placement

On Tue, Sep 01, 2020 at 11:02:02AM -0700, Nick Desaulniers wrote:
> On Tue, Sep 1, 2020 at 8:17 AM Kees Cook <keescook@...omium.org> wrote:
> >
> > On Tue, Sep 01, 2020 at 10:16:47AM +0200, Ingo Molnar wrote:
> > > > This is with:
> > > >
> > > >   GNU ld version 2.25-17.fc23
> >
> > (At best, this is from 2015 ... but yes, min binutils in 2.23.)
> 
> Ah, crap! Indeed arch/powerpc/Makefile wraps this in ld-option.

Yeah, I totally missed that too. :)

> Uh oh, the ppc vdso uses cc-ldoption which was removed! (I think by
> me; let me send patches)  How is that not an error?  Yes, guilty,
> officer.
> commit 055efab3120b ("kbuild: drop support for cc-ldoption").
> Did I not know how to use grep, or?  No, it is
> commit f2af201002a8 ("powerpc/build: vdso linker warning for orphan sections")
> that is wrong.

Eek, yeah, the vdso needs fixing; whoops. Lucky for my series, I only need
ld-option! ;)

(Doing test builds now...)

-- 
Kees Cook