[PATCH v2] news: Describe AArch64-specific changes

[Wilco Dijkstra]

Hi Yury,

> +* On AArch64 targets that support Guarded Control Stack extension all GCS
> +  operations (including status, write on shadow stack, and push to shadow
> +  stack) are locked after enabling GCS with ENFORCED or OVERRIDE GCS policy.
> +  When a GCS operation is locked, a program cannot change this operation
> +  status via prctl syscall.  This prevents disabling or corrupting GCS
> +  shadow stack during runtime.

Thanks, that's far clearer!

OK.

Cheers,
Wilco