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Date: Tue, 18 Feb 2020 16:58:25 -0800
From: Kees Cook <keescook@...omium.org>
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>,
Mark Rutland <mark.rutland@....com>, james.morse@....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 v8 09/12] arm64: disable SCS for hypervisor code
On Tue, Feb 18, 2020 at 04:08:14PM -0800, 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
> ---
> 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 a3a6a2ba9a63..0f0603f55ea0 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) \
> ({ \
> --
> 2.25.0.265.gbab2e86ba0-goog
>
--
Kees Cook
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