linux-kernel - Re: [PATCH v12 4/39] mman: Add map_shadow

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Message-ID: <ZtbPksgBZiXd0iHc@arm.com>
Date: Tue, 3 Sep 2024 09:57:54 +0100
From: Yury Khrustalev <yury.khrustalev@....com>
To: Mark Brown <broonie@...nel.org>
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Subject: Re: [PATCH v12 4/39] mman: Add map_shadow_stack() flags

On Thu, Aug 29, 2024 at 12:27:20AM +0100, Mark Brown wrote:
> In preparation for adding arm64 GCS support make the map_shadow_stack()
> SHADOW_STACK_SET_TOKEN flag generic and add _SET_MARKER. The existing
> flag indicates that a token usable for stack switch should be added to
> the top of the newly mapped GCS region while the new flag indicates that
> a top of stack marker suitable for use by unwinders should be added
> above that.
> 
> For arm64 the top of stack marker is all bits 0.
> 
> Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@...aro.org>
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> Signed-off-by: Mark Brown <broonie@...nel.org>

Acked-by: Yury Khrustalev <yury.khrustalev@....com>