linux-hardening - Re: [RFC PATCH 9/9] arm64: implement dynamic shadow call stack for GCC

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Message-ID: <YWb+TCAqugt4RFQg@sirena.org.uk>
Date:   Wed, 13 Oct 2021 16:42:04 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-hardening@...r.kernel.org, mark.rutland@....com,
        catalin.marinas@....com, will@...nel.org
Subject: Re: [RFC PATCH 9/9] arm64: implement dynamic shadow call stack for
 GCC

On Wed, Oct 13, 2021 at 05:22:43PM +0200, Ard Biesheuvel wrote:

> +config UNWIND_PATCH_PAC_INTO_SCS
> +	def_bool y
> +	depends on CC_IS_GCC && SHADOW_CALL_STACK
> +	select UNWIND_TABLES
> +	select ARM64_PTR_AUTH_KERNEL
> +

This needs a dependency on the GCC relevant toolchain features for
pointer auth doesn't it?  Or just make it depend on rather than select
pointer auth.

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