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

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@...