linux-kernel - Re: [PATCH v3 21/36] arm64/mm: Implement map_shadow

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Date:   Mon, 31 Jul 2023 15:56:50 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
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        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: 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@intel.com/