linux-kernel - Re: [PATCH v8 12/12] efi/libstub: disable SCS

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Message-ID: <CABCJKuckw-_WMDF7=Vndwm5vfZXpeZachUSMMCsN0Sx_P8DXBg@mail.gmail.com>
Date:   Wed, 19 Feb 2020 10:27:33 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Dave Martin <Dave.Martin@....com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 12/12] efi/libstub: disable SCS

On Tue, Feb 18, 2020 at 11:41 PM Ard Biesheuvel
<ard.biesheuvel@...aro.org> wrote:
>
> On Wed, 19 Feb 2020 at 01:09, Sami Tolvanen <samitolvanen@...gle.com> wrote:
> >
> > +#  remove SCS flags from all objects in this directory
> > +KBUILD_CFLAGS := $(filter-out -ffixed-x18 $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
> > +
>
> I don't see why you'd need to remove -ffixed-x18 again here. Not using
> x18 anywhere in the kernel is a much more maintainable approach.

Sure, I will drop -ffixed-x18 from here in v9. Thanks,

Sami