linux-kernel - Re: [PATCH] reset: gpio: suppress bind attributes in sysfs

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Message-ID: <75004da5-1ff6-4391-9839-2d134709eea0@kernel.org>
Date: Thu, 4 Dec 2025 12:14:39 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>,
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] reset: gpio: suppress bind attributes in sysfs

On 04/12/2025 10:44, Bartosz Golaszewski wrote:
> This is a special device that's created dynamically and is supposed to
> stay in memory forever. We also currently don't have a devlink between

Not forever. If every consumer is unloaded, this can be unloaded too, no?

> it and the actual reset consumer. Suppress sysfs bind attributes so that

With that reasoning every reset consumer should have suppress binds.
Devlink should be created by reset controller framework so it is not
this driver's fault.

git grep suppress_bind_attrs -- drivers/reset/

gives only few of such controllers.


> user-space can't unbind the device because - as of now - it will cause a
> use-after-free splat from any user that puts the reset control handle.
> 
> Fixes: cee544a40e44 ("reset: gpio: Add GPIO-based reset controller")

Nothing to be fixed here, unless you claim that every reset provider is
broken as well? What is exactly different in handling devlinks between
this driver and every other reset provider?

> Cc: stable@...r.kernel.org
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
> ---


Best regards,
Krzysztof