linux-kernel - Re: [PATCH v10 12/40] mm: Define VM_SHADOW

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Message-ID: <3a7d9b69-e9df-4271-a3f0-8e8683c2654f@sirena.org.uk>
Date: Thu, 15 Aug 2024 16:26:38 +0100
From: Mark Brown <broonie@...nel.org>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
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Subject: Re: [PATCH v10 12/40] mm: Define VM_SHADOW_STACK for arm64 when we
 support GCS

On Thu, Aug 15, 2024 at 03:20:52PM +0000, Edgecombe, Rick P wrote:
> On Thu, 2024-08-01 at 13:06 +0100, Mark Brown wrote:
> > Use VM_HIGH_ARCH_5 for guarded control stack pages.

> FYI - If you want to have more complete guard gaps, you need to do this for arm
> too:
> https://lore.kernel.org/linux-mm/20240326021656.202649-14-rick.p.edgecombe@intel.com/

> Using VM_SHADOW_STACK only gets you part of the way there.

Oh, thanks for the heads up - I'd missed that.

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