linux-kernel - Re: [PATCH v2 2/2] kbuild: Disable CONFIG_LD_ORPHAN

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Message-ID: <202011241421.A2F3062A70@keescook>
Date:   Tue, 24 Nov 2020 14:22:31 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        "kernelci . org bot" <bot@...nelci.org>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2 2/2] kbuild: Disable CONFIG_LD_ORPHAN_WARN for ld.lld
 10.0.1

On Thu, Nov 19, 2020 at 01:13:27PM -0800, Nick Desaulniers wrote:
> On Thu, Nov 19, 2020 at 12:57 PM Nathan Chancellor
> <natechancellor@...il.com> wrote:
> >
> > ld.lld 10.0.1 spews a bunch of various warnings about .rela sections,
> > along with a few others. Newer versions of ld.lld do not have these
> > warnings. As a result, do not add '--orphan-handling=warn' to
> > LDFLAGS_vmlinux if ld.lld's version is not new enough.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/1187
> > Link: https://github.com/ClangBuiltLinux/linux/issues/1193
> > Reported-by: Arvind Sankar <nivedita@...m.mit.edu>
> > Reported-by: kernelci.org bot <bot@...nelci.org>
> > Reported-by: Mark Brown <broonie@...nel.org>
> > Reviewed-by: Kees Cook <keescook@...omium.org>
> > Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> 
> Thanks for the additions in v2.
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

I'm going to carry this for a few days in -next, and if no one screams,
ask Linus to pull it for v5.10-rc6.

Thanks!

-- 
Kees Cook