[PATCH v4 21/36] arm64/mm: Implement map_shadow_stack()

[Mark Brown]

On Fri, Aug 11, 2023 at 05:38:24PM +0100, Catalin Marinas wrote:

> Given that we won't have an mmap(PROT_SHADOW_STACK), are we going to
> have restrictions on mprotect()? E.g. it would be useful to reject a
> PROT_EXEC on the shadow stack.

mprotect() uses arch_validate_flags() which we're already having cover
this so it's already covered.
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