Re: [PATCH v4 38/39] x86/shstk: Add ARCH_SHSTK_UNLOCK

On Fri, Dec 02, 2022 at 04:36:05PM -0800, Rick Edgecombe wrote:

From: Mike Rapoport <redacted>

Userspace loaders may lock features before a CRIU restore operation has
the chance to set them to whatever state is required by the process
being restored. Allow a way for CRIU to unlock features. Add it as an
arch_prctl() like the other shadow stack operations, but restrict it being
called by the ptrace arch_pctl() interface.

Tested-by: Pengfei Xu <redacted>
Tested-by: John Allen <john.allen@amd.com>
Signed-off-by: Mike Rapoport <redacted>

Reviewed-by: Kees Cook <redacted>

-- 
Kees Cook