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SubjectRe: [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@arm.com>
> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

Reviewed-by: Kees Cook <keescook@chromium.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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