[PATCH v3 21/36] arm64/mm: Implement map_shadow_stack()

[Edgecombe, Rick P]

On Mon, 2023-07-31 at 14:43 +0100, Mark Brown wrote:
> +SYSCALL_DEFINE3(map_shadow_stack, unsigned long, addr, unsigned
> long, size, unsigned int, flags)
> +{
> +       unsigned long alloc_size;
> +       unsigned long __user *cap_ptr;
> +       unsigned long cap_val;
> +       int ret;
> +
> +       if (!system_supports_gcs())
> +               return -EOPNOTSUPP;
> +
> +       if (flags)
> +               return -EINVAL;

Any thoughts on the questions at the end of this mail?

https://lore.kernel.org/lkml/7a4c97f68347d4188286c543cdccaa12577cdb9e.camel@intel.com/