kernel-hardening - Re: [PATCH v2 16/17] arm64: disable SCS for hypervisor code

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Message-ID: <CABCJKuegPN+=rHp4E+QMtfAB0w=MikZVG7vxoTBpLkE56UR4HA@mail.gmail.com>
Date: Fri, 25 Oct 2019 12:24:33 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
	Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Ard Biesheuvel <ard.biesheuvel@...aro.org>, Dave Martin <Dave.Martin@....com>, 
	Kees Cook <keescook@...omium.org>, Laura Abbott <labbott@...hat.com>, 
	Mark Rutland <mark.rutland@....com>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Jann Horn <jannh@...gle.com>, Miguel Ojeda <miguel.ojeda.sandonis@...il.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 v2 16/17] arm64: disable SCS for hypervisor code

On Thu, Oct 24, 2019 at 6:31 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> $(subst ... ) is not the correct use here.
>
> It works like sed,   s/$(CC_CFLAGS_SCS)//
> instead of matching by word.
>
>
>
>
> KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
>
> is more correct, and simpler.

Thanks, I will change this in v3.

Sami

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