linux-kernel - Re: [PATCH net v2] ptp: Properly handle compat ioctls

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Message-ID: <Z5VH2zW0t_elr9J8@hoboy.vegasvil.org>
Date: Sat, 25 Jan 2025 12:21:47 -0800
From: Richard Cochran <richardcochran@...il.com>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <jstultz@...gle.com>, Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Cyrill Gorcunov <gorcunov@...il.com>
Subject: Re: [PATCH net v2] ptp: Properly handle compat ioctls

On Sat, Jan 25, 2025 at 10:28:38AM +0100, Thomas Weißschuh wrote:
> Pointer arguments passed to ioctls need to pass through compat_ptr() to
> work correctly on s390; as explained in Documentation/driver-api/ioctl.rst.
> Detect compat mode at runtime and call compat_ptr() for those commands
> which do take pointer arguments.
> 
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Link: https://lore.kernel.org/lkml/1ba5d3a4-7931-455b-a3ce-85a968a7cb10@app.fastmail.com/
> Fixes: d94ba80ebbea ("ptp: Added a brand new class driver for ptp clocks.")
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>

Acked-by: Richard Cochran <richardcochran@...il.com>