[{"id":3683236,"web_url":"http://patchwork.ozlabs.org/comment/3683236/","msgid":"","list_archive_url":null,"date":"2026-04-28T08:16:07","subject":"Re: [PATCH v9 0/9] drivers/base: Introduce revocable","submitter":{"id":92191,"url":"http://patchwork.ozlabs.org/api/people/92191/","name":"Bartosz Golaszewski","email":"brgl@kernel.org"},"content":"On Mon, 27 Apr 2026 15:58:32 +0200, Tzung-Bi Shih said:\n> This series introduces the \"revocable\" mechanism, a synchronization\n> primitive designed to prevent Use-After-Free errors.\n>\n> - Patch 1 introduces the revocable which is an implementation of ideas\n> from the talk [1].\n>\n> - Patch 2 adds KUnit test cases.\n>\n> - Patches 3 to 7 transitions the UAF prevention logic within the GPIO\n> core (gpiolib) to use the \"revocable\" mechanism.\n>\n> The existing code aims to prevent UAF issues when the underlying GPIO\n> chip is removed. They replace that custom logic with the generic\n> \"revocable\" API, which is designed to handle such lifecycle\n> dependencies. There should be no changes in behavior.\n>\n> - Patches 8 to 9 uses \"revocable\" mechanism to fix an UAF in\n> cros_ec_chardev driver. Alternatively, [2] is a series for fixing the\n> same issue without using \"revocable\".\n>\n> Since v9, there are two ways to manage the resource provider handle.\n> - Embedded allocation: patches 3 to 7 might be the potential user.\n> - Dynamic allocation: patches 8 to 9 might be the potential user.\n>\n> [1] https://lpc.events/event/17/contributions/1627/\n> [2] https://lore.kernel.org/all/20260427134659.95181-1-tzungbi@kernel.org\n>\n> ---\n> v9:\n> - Rebase onto v7.1-rc1.\n> - Remove the selftests patch as it makes less sense to test revocable\n> APIs via kselftests.\n\nMay I suggest kunit for that purpose?\n\nBart","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=qIBWvKmq;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Tue, 28 Apr 2026\n 01:16:08 -0700 (PDT)","From":"Bartosz Golaszewski ","In-Reply-To":"<20260427135841.96266-1-tzungbi@kernel.org>","Precedence":"bulk","X-Mailing-List":"linux-gpio@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260427135841.96266-1-tzungbi@kernel.org>","Date":"Tue, 28 Apr 2026 01:16:07 -0700","X-Gmail-Original-Message-ID":"\n ","X-Gm-Features":"AVHnY4LPpc6CD92dyZC7ll_n7sufI8xvpfzAcz25gEttk1XdSLAYMTRwT5j_PwM","Message-ID":"\n ","Subject":"Re: [PATCH v9 0/9] drivers/base: Introduce revocable","To":"Tzung-Bi Shih ","Cc":"Benson Leung , linux-kernel@vger.kernel.org,\n\tchrome-platform@lists.linux.dev, driver-core@lists.linux.dev,\n\tlinux-doc@vger.kernel.org, linux-gpio@vger.kernel.org,\n\t\"Rafael J. Wysocki\" , Danilo Krummrich ,\n Jonathan Corbet ,\n\tShuah Khan ,\n Laurent Pinchart ,\n\tWolfram Sang ,\n Jason Gunthorpe ,\n\tJohan Hovold , \"Paul E . McKenney\" ,\n\tDan Williams , Arnd Bergmann ,\n\tGreg Kroah-Hartman ,\n Bartosz Golaszewski ,\n\tLinus Walleij ","Content-Type":"text/plain; charset=\"UTF-8\""}},{"id":3683237,"web_url":"http://patchwork.ozlabs.org/comment/3683237/","msgid":"","list_archive_url":null,"date":"2026-04-28T08:18:25","subject":"Re: [PATCH v9 0/9] drivers/base: Introduce revocable","submitter":{"id":92191,"url":"http://patchwork.ozlabs.org/api/people/92191/","name":"Bartosz Golaszewski","email":"brgl@kernel.org"},"content":"On Tue, Apr 28, 2026 at 10:16 AM Bartosz Golaszewski wrote:\n>\n> > ---\n> > v9:\n> > - Rebase onto v7.1-rc1.\n> > - Remove the selftests patch as it makes less sense to test revocable\n> > APIs via kselftests.\n>\n> May I suggest kunit for that purpose?\n>\n> Bart\n\nNevermind this, you did exactly that.\n\nBart","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=WWhH7r6Z;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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Tue, 28 Apr 2026\n 01:18:38 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-gpio@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260427135841.96266-1-tzungbi@kernel.org>\n ","In-Reply-To":"\n ","From":"Bartosz Golaszewski ","Date":"Tue, 28 Apr 2026 10:18:25 +0200","X-Gmail-Original-Message-ID":"\n ","X-Gm-Features":"AVHnY4JD7aUdC5j3W8xDfoS0kGuriHPxhl3Qt0U8ZbQApFNMnsdkWkk7dojljys","Message-ID":"\n ","Subject":"Re: [PATCH v9 0/9] drivers/base: Introduce revocable","To":"Tzung-Bi Shih ","Cc":"Benson Leung , linux-kernel@vger.kernel.org,\n\tchrome-platform@lists.linux.dev, driver-core@lists.linux.dev,\n\tlinux-doc@vger.kernel.org, linux-gpio@vger.kernel.org,\n\t\"Rafael J. Wysocki\" , Danilo Krummrich ,\n Jonathan Corbet ,\n\tShuah Khan ,\n Laurent Pinchart ,\n\tWolfram Sang ,\n Jason Gunthorpe ,\n\tJohan Hovold , \"Paul E . McKenney\" ,\n\tDan Williams , Arnd Bergmann ,\n\tGreg Kroah-Hartman ,\n Linus Walleij ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}}]