linux-kernel - Re: [PATCH 1/2] kbuild: remove cc-option test of -fno-stack-protector

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Message-ID: <202006261312.560B045E@keescook>
Date:   Fri, 26 Jun 2020 13:13:18 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] kbuild: remove cc-option test of -fno-stack-protector

On Fri, Jun 26, 2020 at 12:09:37PM -0700, Nick Desaulniers wrote:
> On Fri, Jun 26, 2020 at 12:00 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >  CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
> > -       $(call cc-option, -fno-stack-protector,) \
> > -       $(call cc-option, -fno-stack-protector-all,)
> > +       -fno-stack-protector $(call cc-option, -fno-stack-protector-all)
> 
> Just curious, looks like we could do the same for
> `-fno-stack-protector-all`, here or tree-wide, right?  Wait, what
> compiler recognizes -fno-stack-protector-all?
> https://godbolt.org/z/QFQKE_

That is from ancient times, IIRC. -fno-stack-protector should be
sufficient.

-- 
Kees Cook