linux-kernel - Re: [PATCH v12 26/39] arm64/ptrace: Expose GCS via ptrace and core files

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Message-ID: <3f190f54-477e-48dd-8a57-8d61ea20413b@sirena.org.uk>
Date: Mon, 2 Sep 2024 19:58:28 +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>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Arnd Bergmann <arnd@...db.de>, Oleg Nesterov <oleg@...hat.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	Shuah Khan <shuah@...nel.org>,
	"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
	Deepak Gupta <debug@...osinc.com>, Ard Biesheuvel <ardb@...nel.org>,
	Szabolcs Nagy <Szabolcs.Nagy@....com>, Kees Cook <kees@...nel.org>,
	"H.J. Lu" <hjl.tools@...il.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
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	Wilco Dijkstra <wilco.dijkstra@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
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Subject: Re: [PATCH v12 26/39] arm64/ptrace: Expose GCS via ptrace and core
 files

On Mon, Sep 02, 2024 at 07:56:32PM +0100, Catalin Marinas wrote:
> On Thu, Aug 29, 2024 at 12:27:42AM +0100, Mark Brown wrote:

> > +static int gcs_get(struct task_struct *target,
> > +		   const struct user_regset *regset,
> > +		   struct membuf to)

> > +	if (target == current)
> > +		gcs_preserve_current_state();

> What's the use-case where target == current and do we need something
> similar for gcs_set()?

IIRC core file generation so no.

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