linux-kernel - Re: [PATCH v12 25/39] arm64/signal: Expose GCS state in signal frames

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Message-ID: <ZtYKC8ytQBJpudOt@arm.com>
Date: Mon, 2 Sep 2024 19:55:07 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Mark Brown <broonie@...nel.org>
Cc: Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marc Zyngier <maz@...nel.org>,
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Subject: Re: [PATCH v12 25/39] arm64/signal: Expose GCS state in signal frames

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@...nel.org>

It looks fine to me now.

Reviewed-by: Catalin Marinas <catalin.marinas@....com>