linux-kernel - Re: [PATCH v3 0/5] platform/chrome: Fix a possible UAF via revocable

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Message-ID: <2033c6cd-4112-4c8a-a9ef-2ab34f3504b8@kernel.org>
Date: Fri, 12 Sep 2025 11:09:16 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Tzung-Bi Shih <tzungbi@...nel.org>, Benson Leung <bleung@...omium.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 "Rafael J . Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>
Cc: Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
 Dawid Niedzwiecki <dawidn@...gle.com>, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
 linux-kselftest@...r.kernel.org,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: Re: [PATCH v3 0/5] platform/chrome: Fix a possible UAF via revocable

On 12/09/2025 10:17, Tzung-Bi Shih wrote:
> This is a follow-up series of [1].  It tries to fix a possible UAF in the
> fops of cros_ec_chardev after the underlying protocol device has gone by
> using revocable.
> 
> The 1st patch introduces the revocable which is an implementation of ideas
> from the talk [2].
> 
> The 2nd and 3rd patches add test cases for revocable in Kunit and selftest.
> 
> The 4th patch converts existing protocol devices to resource providers
> of cros_ec_device.
> 
> The 5th patch converts cros_ec_chardev to a resource consumer of
> cros_ec_device to fix the UAF.
> 
> [1] https://lore.kernel.org/chrome-platform/20250721044456.2736300-6-tzungbi@kernel.org/
> [2] https://lpc.events/event/17/contributions/1627/
> 
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>

Thanks for the work. Just a note, please start using b4, so above Cc
will be propagated to all patches. Folks above received only the cover
letter...

Best regards,
Krzysztof