linux-kernel - Re: [PATCH v3 15/17] arm64: vdso: disable Shadow Call Stack

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Message-ID: <CAKwvOdkAe9TeB-dVqrDT7ZRQG8U4nHkkHwiDcRRPPY8w-Q9wQQ@mail.gmail.com>
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