linux-kernel - Re: [PATCH v10 21/40] arm64/gcs: Implement shadow stack prctl() interface

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Message-ID: <ba752f63-6a6b-4353-b2c2-0531d943cfd6@sirena.org.uk>
Date: Wed, 21 Aug 2024 14:41:19 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>
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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	Suzuki K Poulose <suzuki.poulose@....com>,
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	"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
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	Szabolcs Nagy <Szabolcs.Nagy@....com>, Kees Cook <kees@...nel.org>,
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Subject: Re: [PATCH v10 21/40] arm64/gcs: Implement shadow stack prctl()
 interface

On Wed, Aug 21, 2024 at 01:54:33PM +0100, Catalin Marinas wrote:

> Otherwise it looks fine.

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

I've also added:

+
+       /* Ensure we remember GCSPR_EL0 if we're disabling. */
+       if (task_gcs_el0_enabled(current))
+               current->thread.gcspr_el0 = read_sysreg_s(SYS_GCSPR_EL0);

to handle the disable case.

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