[PATCH v12 25/39] arm64/signal: Expose GCS state in signal frames

[Yury Khrustalev]

On Thu, Aug 29, 2024 at 12:27:41AM +0100, Mark Brown wrote:
> Add a context for the GCS state and include it in the signal context when
> running on a system that supports GCS. We reuse the same flags that the
> prctl() uses to specify which GCS features are enabled and also provide the
> current GCS pointer.
> 
> We do not support enabling GCS via signal return, there is a conflict
> between specifying GCSPR_EL0 and allocation of a new GCS and this is not
> an ancticipated use case.  We also enforce GCS configuration locking on
> signal return.
> 
> Signed-off-by: Mark Brown <broonie at kernel.org>
> Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>

Acked-by: Yury Khrustalev <yury.khrustalev at arm.com>