Re: [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack

From: Kees Cook
Date: Tue Oct 22 2019 - 12:27:45 EST

On Tue, Oct 22, 2019 at 05:00:10PM +0100, Mark Rutland wrote:
> If we wanted to, we could periodically grep for x18 to find any illicit
> usage.

Now we need objtool for arm64! :) (It seems CONFIG_HAVE_STACK_VALIDATION
is rather a narrow description for what objtool does now...)

Kees Cook