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

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Message-ID: <68ec09da-fb4a-4d59-9c8c-6fae4c48ea68@sirena.org.uk>
Date: Thu, 15 Aug 2024 17:39:12 +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 04:26:47PM +0100, Mark Brown wrote:
> On Thu, Aug 15, 2024 at 03:20:52PM +0000, Edgecombe, Rick P wrote:

> > 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.

Looking at this I think it makes sense to do as was done for x86 and
split this out into a separate series (part of why I'd missed it),
updating the generic implementation to do this by default.  That'll
touch a bunch of architectures and the series is already quite big,
it's not really an ABI impact.

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