linux-kernel - Re: [PATCH v10 09/12] arm64: disable SCS for hypervisor code

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Date:   Mon, 6 Apr 2020 11:23:24 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Dave Martin <Dave.Martin@....com>,
        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@...glegroups.com,
        kernel-hardening@...ts.openwall.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 09/12] arm64: disable SCS for hypervisor code

On Mon, Apr 06, 2020 at 09:41:18AM -0700, Sami Tolvanen wrote:
> Disable SCS for code that runs at a different exception level by
> adding __noscs to __hyp_text.
> 
> Suggested-by: James Morse <james.morse@....com>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> Acked-by: Marc Zyngier <maz@...nel.org>
> ---
>  arch/arm64/include/asm/kvm_hyp.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
> index fe57f60f06a8..875b106c5d98 100644
> --- a/arch/arm64/include/asm/kvm_hyp.h
> +++ b/arch/arm64/include/asm/kvm_hyp.h
> @@ -13,7 +13,7 @@
>  #include <asm/kvm_mmu.h>
>  #include <asm/sysreg.h>
>  
> -#define __hyp_text __section(.hyp.text) notrace
> +#define __hyp_text __section(.hyp.text) notrace __noscs
>  
>  #define read_sysreg_elx(r,nvh,vh)					\
>  	({								\
> -- 
> 2.26.0.292.g33ef6b2f38-goog
> 

-- 
Kees Cook