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Date: Tue, 22 Oct 2019 09:27:40 -0700
From: Kees Cook <>
To: Mark Rutland <>
Cc: Nick Desaulniers <>,
	Sami Tolvanen <>,
	Will Deacon <>,
	Catalin Marinas <>,
	Steven Rostedt <>,
	Ard Biesheuvel <>,
	Dave Martin <>,
	Laura Abbott <>,
	clang-built-linux <>,
	Kernel Hardening <>,
	Linux ARM <>,
	LKML <>
Subject: Re: [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack

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

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