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

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Message-ID: <CAK7LNATPpL-B0APPXFcWPCR6ZTSrXv-v_ZkdFqjKJ4pwUpcWug@mail.gmail.com>
Date: Fri, 25 Oct 2019 10:29:47 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: Sami Tolvanen <samitolvanen@...gle.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 Fri, Oct 25, 2019 at 7:52 AM <samitolvanen@...gle.com> wrote:
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> ---
>  arch/arm64/kvm/hyp/Makefile | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
> index ea710f674cb6..8289ea086e5e 100644
> --- a/arch/arm64/kvm/hyp/Makefile
> +++ b/arch/arm64/kvm/hyp/Makefile
> @@ -28,3 +28,6 @@ GCOV_PROFILE  := n
>  KASAN_SANITIZE := n
>  UBSAN_SANITIZE := n
>  KCOV_INSTRUMENT        := n
> +
> +ORIG_CFLAGS := $(KBUILD_CFLAGS)
> +KBUILD_CFLAGS = $(subst $(CC_FLAGS_SCS),,$(ORIG_CFLAGS))


$(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.




-- 
Best Regards
Masahiro Yamada

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