Re: [PATCH v4 02/39] x86/shstk: Add Kconfig option for Shadow Stack

[Kees Cook]

On Fri, Dec 02, 2022 at 04:35:29PM -0800, Rick Edgecombe wrote:
> From: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
> 
> Shadow Stack provides protection for applications against function return
> address corruption. It is active when the processor supports it, the
> kernel has CONFIG_X86_SHADOW_STACK 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.
> 
> Since there is another feature that utilizes CET (Kernel IBT) that will
> share implementation with Shadow Stacks, create CONFIG_CET to signify
> that at least one CET feature is configured.
> 
> Tested-by: Pengfei Xu <pengfei.xu@xxxxxxxxx>
> Tested-by: John Allen <john.allen@xxxxxxx>
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook