Re: [OPTIONAL/RFC v2 38/39] x86/cet/shstk: Add ARCH_CET_UNLOCK

From: Kees Cook
Date: Mon Oct 03 2022 - 20:00:55 EST

On Thu, Sep 29, 2022 at 03:29:35PM -0700, Rick Edgecombe wrote:
> From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
> 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 CET operations, but restrict it being called
> by the ptrace arch_pctl() interface.

Hrm, please make this build-depend on CRIU...

Kees Cook