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Date: Thu, 31 Oct 2019 10:28:43 -0700
From: Nick Desaulniers <ndesaulniers@...gle.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>, 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 <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 15/17] arm64: vdso: disable Shadow Call Stack
On Thu, Oct 31, 2019 at 9:47 AM <samitolvanen@...gle.com> wrote:
I've gotten slapped down before for -ENOCOMMITMSG; maybe include more
info if there's a v4? Maintainers can take the safe position of
always saying "no," so it is useful to always provide an answer to the
implicit question, "why should I take this patch?"
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> ---
> arch/arm64/kernel/vdso/Makefile | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
> index dd2514bb1511..a87a4f11724e 100644
> --- a/arch/arm64/kernel/vdso/Makefile
> +++ b/arch/arm64/kernel/vdso/Makefile
> @@ -25,7 +25,7 @@ ccflags-y += -DDISABLE_BRANCH_PROFILING
>
> VDSO_LDFLAGS := -Bsymbolic
>
> -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
> +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS)
Looks like vgettimeofday is the only remaining source written in C, so
we shouldn't need to strip it from other assembly source files.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> KBUILD_CFLAGS += $(DISABLE_LTO)
> KASAN_SANITIZE := n
> UBSAN_SANITIZE := n
> --
> 2.24.0.rc0.303.g954a862665-goog
>
--
Thanks,
~Nick Desaulniers
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