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From: Marco Elver <elver@google.com>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com,
	x86@kernel.org, linux-efi@vger.kernel.org,
	Kees Cook <keescook@chromium.org>,
	linux-kernel@vger.kernel.org, paulmck@kernel.org
Subject: Re: [PATCH 1/2] kbuild: remove cc-option test of -fno-stack-protector
Date: Wed, 1 Jul 2020 08:01:50 +0200
Message-ID: <20200701060150.GA1181113@elver.google.com> (raw)
In-Reply-To: <20200626185913.92890-1-masahiroy@kernel.org>

On Sat, Jun 27, 2020 at 03:59AM +0900, Masahiro Yamada wrote:
> Some Makefiles already pass -fno-stack-protector unconditionally.
> For example, arch/arm64/kernel/vdso/Makefile, arch/x86/xen/Makefile.
> No problem report so far about hard-coding this option. So, we can
> assume all supported compilers know -fno-stack-protector.
> 
> GCC 4.8 and Clang support this option (https://godbolt.org/z/_HDGzN)
> 
> Get rid of cc-option from -fno-stack-protector.
> 
> Remove CONFIG_CC_HAS_STACKPROTECTOR_NONE, which should always be 'y'.
> 
> Note:
> arch/mips/vdso/Makefile adds -fno-stack-protector twice, first
> unconditionally, and second conditionally. I removed the second one.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
> 
>  Documentation/kbuild/kconfig-language.rst | 4 ++--
>  Makefile                                  | 2 +-
>  arch/Kconfig                              | 3 ---
>  arch/arm/boot/compressed/Makefile         | 3 +--
>  arch/mips/vdso/Makefile                   | 3 +--
>  arch/powerpc/kernel/Makefile              | 2 +-
>  arch/powerpc/platforms/powermac/Makefile  | 2 +-
>  arch/sparc/vdso/Makefile                  | 4 ++--
>  arch/um/Makefile                          | 3 +--
>  arch/x86/Makefile                         | 2 +-
>  arch/x86/boot/compressed/Makefile         | 2 +-
>  arch/x86/entry/vdso/Makefile              | 4 ++--
>  arch/x86/kernel/cpu/Makefile              | 3 +--
>  arch/x86/lib/Makefile                     | 2 +-
>  arch/x86/mm/Makefile                      | 7 +++----
>  arch/x86/power/Makefile                   | 3 +--
>  arch/x86/purgatory/Makefile               | 2 +-
>  arch/x86/um/vdso/Makefile                 | 2 +-
>  arch/x86/xen/Makefile                     | 5 ++---
>  drivers/firmware/efi/libstub/Makefile     | 2 +-
>  drivers/xen/Makefile                      | 3 +--
>  kernel/kcsan/Makefile                     | 3 +--

Is it possible that this patch drops the KCSAN portion? We have a patch
that is part of a series intended for 5.9 that also removes the
cc-option from -fno-stack-protector, but can't easily be dropped from
the surrounding series.

Please see: https://lkml.kernel.org/r/20200624190236.GA6603@paulmck-ThinkPad-P72

Thanks,
-- Marco

      parent reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-26 18:59 Masahiro Yamada
2020-06-26 18:59 ` [PATCH 2/2] kbuild: remove cc-option test of -ffreestanding Masahiro Yamada
2020-06-26 19:58   ` Nick Desaulniers
2020-06-26 20:22   ` Kees Cook
2020-06-27  7:39   ` Ard Biesheuvel
2020-06-26 19:09 ` [PATCH 1/2] kbuild: remove cc-option test of -fno-stack-protector Nick Desaulniers
2020-06-26 20:00   ` Masahiro Yamada
2020-06-26 20:13   ` Kees Cook
2020-06-26 20:13 ` Nick Desaulniers
2020-06-26 20:21   ` Kees Cook
2020-06-26 20:25     ` Nick Desaulniers
2020-06-26 20:37       ` Kees Cook
2020-06-27 11:58   ` Masahiro Yamada
2020-06-29 18:26     ` Nick Desaulniers
2020-06-29 22:39       ` Nick Desaulniers
2020-06-30 18:18         ` Masahiro Yamada
2020-07-01 19:33         ` Masahiro Yamada
2020-06-26 20:18 ` Kees Cook
2020-06-27  7:39 ` Ard Biesheuvel
2020-07-01  6:01 ` Marco Elver [this message]

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