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Message-ID: <Ztc7fIneIhCEmesI@arm.com>
Date: Tue, 3 Sep 2024 17:38:20 +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>,
	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>,
	Florian Weimer <fweimer@...hat.com>,
	Christian Brauner <brauner@...nel.org>,
	Thiago Jung Bauermann <thiago.bauermann@...aro.org>,
	Ross Burton <ross.burton@....com>,
	Yury Khrustalev <yury.khrustalev@....com>,
	Wilco Dijkstra <wilco.dijkstra@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	kvmarm@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v12 26/39] arm64/ptrace: Expose GCS via ptrace and core
 files

On Mon, Sep 02, 2024 at 07:58:28PM +0100, Mark Brown wrote:
> 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.

Ah, true. Makes sense.

-- 
Catalin

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