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Message-ID: <201910220926.B78C4D88@keescook>
Date: Tue, 22 Oct 2019 09:27:40 -0700
From: Kees Cook <keescook@...omium.org>
To: Mark Rutland <mark.rutland@....com>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>,
Sami Tolvanen <samitolvanen@...gle.com>,
Will Deacon <will@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Dave Martin <Dave.Martin@....com>,
Laura Abbott <labbott@...hat.com>,
clang-built-linux <clang-built-linux@...glegroups.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
LKML <linux-kernel@...r.kernel.org>
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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