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

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Subject: Re: [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Tue, 22 Oct 2019 09:27:40 -0700
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Sami Tolvanen <samitolvanen@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, Dave Martin <Dave.Martin@xxxxxxx>, Laura Abbott <labbott@xxxxxxxxxx>, clang-built-linux <clang-built-linux@xxxxxxxxxxxxxxxx>, Kernel Hardening <kernel-hardening@xxxxxxxxxxxxxxxxxx>, Linux ARM <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>
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In-reply-to: <20191022160010.GB699@lakrids.cambridge.arm.com>
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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

References:
- [PATCH 00/18] add support for Clang's Shadow Call Stack
  - From: Sami Tolvanen
- [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack
  - From: Sami Tolvanen
- Re: [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack
  - From: Nick Desaulniers
- Re: [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack
  - From: Mark Rutland

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