Re: [PATCH v17 02/26] x86/cet/shstk: Add Kconfig option for user-mode control-flow protection

[Borislav Petkov]

On Tue, Dec 29, 2020 at 01:30:29PM -0800, Yu-cheng Yu wrote:
> Shadow Stack provides protection against function return address
> corruption.  It is active when the processor supports it, the kernel has
> CONFIG_X86_CET_USER enabled, and the application is built for the feature.
> This is only implemented for the 64-bit kernel.  When it is enabled, legacy
> non-Shadow Stack applications continue to work, but without protection.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
> ---
>  arch/x86/Kconfig           | 22 ++++++++++++++++++++++
>  arch/x86/Kconfig.assembler |  5 +++++
>  2 files changed, 27 insertions(+)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 7b6dd10b162a..72cff400b9ae 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1950,6 +1950,28 @@ config X86_SGX
>  
>  	  If unsure, say N.
>  
> +config ARCH_HAS_SHADOW_STACK
> +	def_bool n
> +
> +config X86_CET_USER

That thing needs to be X86_CET. How many times do I need to type this
before you do it?

-- 
Regards/Gruss,
    Boris.

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