Re: [PATCH v10 12/40] mm: Define VM_SHADOW_STACK for arm64 when we support GCS

Mark Brown
2024-08-15T16:39:22Z

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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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