Re: [PATCH 1/7] x86/cet: Add Kconfig option for user-mode Indirect Branch Tracking

[Randy Dunlap]

On 06/07/2018 07:38 AM, Yu-cheng Yu wrote:
> The user-mode indirect branch tracking support is done mostly by
> GCC to insert ENDBR64/ENDBR32 instructions at branch targets.
> The kernel provides CPUID enumeration, feature MSR setup and
> the allocation of legacy bitmap.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
> ---
>  arch/x86/Kconfig | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 24339a5299da..27bfbd137fbe 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1953,6 +1953,18 @@ config X86_INTEL_SHADOW_STACK_USER
>  
>  	  If unsure, say y.
>  
> +config X86_INTEL_BRANCH_TRACKING_USER
> +	prompt "Intel Indirect Branch Tracking for user-mode"
> +	def_bool n
> +	depends on CPU_SUP_INTEL && X86_64
> +	select X86_INTEL_CET
> +	select ARCH_HAS_PROGRAM_PROPERTIES
> +	---help---
> +	  Indirect Branch Tracking provides hardware protection against 	
> +	  oriented programing attacks.

	           programming

and please just move the return/jmp parts to the next line also:

	                                             protection against
	  return-/jmp-oriented programming attacks.

> +
> +	  If unsure, say y
> +
>  config EFI
>  	bool "EFI runtime service support"
>  	depends on ACPI
> 


-- 
~Randy