Re: [PATCH v5 39/39] x86/shstk: Add ARCH_SHSTK_STATUS

[Kees Cook]

On Thu, Jan 19, 2023 at 01:23:17PM -0800, Rick Edgecombe wrote:
> CRIU and GDB need to get the current shadow stack and WRSS enablement
> status. This information is already available via /proc/pid/status, but
> this is inconvenient for CRIU because it involves parsing the text output
> in an area of the code where this is difficult. Provide a status
> arch_prctl(), ARCH_SHSTK_STATUS for retrieving the status. Have arg2 be a
> userspace address, and make the new arch_prctl simply copy the features
> out to userspace.
> 
> Tested-by: Pengfei Xu <pengfei.xu@xxxxxxxxx>
> Suggested-by: Mike Rapoport <rppt@xxxxxxxxxx>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook