From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 66AAB1DF26E; Tue, 24 Mar 2026 00:59:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774313972; cv=none; b=e0uMYgmfNy/rshUduBxdi0B9wUWtN3hz9m2ktjZ0O5aujPlDQyc94Q4G/4ouusribSVtlB9LDDndU6aSsebn4IeVrZp5Hg+8pQGSsDHlPXEMCBR0F/3cPvm7s/BvZH+eqdJMpOo3ouYM2NvsiTP+APg/F6EXolP+wxaukMAYkUc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774313972; c=relaxed/simple; bh=g9n6egUYTuF5ke2JJ6m74go1iA9dbs1LNBwQX9Kfxdo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=KAB09zD+vGfQS/hpeTaOSW2W5R7Oj+LilVeml7NfvtNEMgPfwcX4Pqo0AA6CR+BsdlJ1sCGIAyO+RLXiyU3xMxMJzz0fl1j+1hyDOYTUnt6GorWD1gzPfxLmMDO0rgY9fqOo4JbrvHyl9Rzr2vKoPGA+/U1A5w/L/WbSnhW8lU8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=r79tvbMT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="r79tvbMT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF2ECC4CEF7; Tue, 24 Mar 2026 00:59:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774313972; bh=g9n6egUYTuF5ke2JJ6m74go1iA9dbs1LNBwQX9Kfxdo=; h=From:To:Cc:Subject:Date:From; b=r79tvbMTbzL0ftvYwrYFxtc47UR6uhBnmMbW/y7VVV1iRybB+2M4JpIoiYURI0KHc xbQi6Hae6AoFoJmbmbDJaHU6H4twMWZBNd3LQspzN5XukCR8uOrEpuyEmdRt0aOb0U mOwgSJ8cLDV9T8BHYl+ocS0L8OVgW58qmKn8ydBwrFxSGxlpZWrzAsZEqo1gSY7MVu kkOnSl/PVHu6HAiahaLq+b8nbHuZsE8hCdipD5o7lr0426ClKDJ0QYolowXlhy4fkV i8IvftFPJDTfcclR/4ZCSmDk8L1PXC7Ak76kNlhT/lIjYoVE7r0UGtOBo25YTrAjXS EFJsJ4/WWZ6pw== From: Danilo Krummrich To: Russell King , Greg Kroah-Hartman , "Rafael J. Wysocki" , Ioana Ciornei , Nipun Gupta , Nikhil Agarwal , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Bjorn Helgaas , Armin Wolf , Bjorn Andersson , Mathieu Poirier , Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Harald Freudenberger , Holger Dengler , Mark Brown , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Alex Williamson , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , "Christophe Leroy (CS GROUP)" Cc: linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-spi@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-arm-kernel@lists.infradead.org, Danilo Krummrich Subject: [PATCH 00/12] treewide: Convert buses to use generic driver_override Date: Tue, 24 Mar 2026 01:59:04 +0100 Message-ID: <20260324005919.2408620-1-dakr@kernel.org> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This is the follow-up of the driver_override generalization in [1], converting the remaining 11 busses and removing the now-unused driver_set_override() helper. All of them (except AP, which has a different race condition) are prone to the potential UAF described in [2], caused by accessing the driver_override field from their corresponding match() callback. In order to address this, the generalized driver_override field in struct device is protected with a spinlock. The driver-core provides accessors, such as device_match_driver_override(), device_has_driver_override() and device_set_driver_override(), which all ensure proper locking internally. Additionally, the driver-core provides a driver_override flag in struct bus_type, which, once enabled, automatically registers generic sysfs callbacks, allowing userspace to modify the driver_override field. SPI and AP are a bit special; both print "\n" when driver_override is not set, whereas all other buses (and thus the driver-core) produce "(null)\n" in this case. Hence, SPI and AP do not take advantage of the driver_override flag in struct bus_type; AP additionally maintains a counter in its custom sysfs store(). Technically, we could support a custom fallback string when driver_override is unset in struct bus_type, but only SPI would benefit from this, since AP has additional custom logic in store() anyways. (I'm not sure if there are userspace programs that strictly rely on this; driverctl seems to check for both, but I rather not break some userspace tool I'm not aware of. :) This series is based on v7.0-rc5 with no additional dependencies, hence those patches can be picked up by subsystems individually. [1] https://lore.kernel.org/driver-core/20260303115720.48783-1-dakr@kernel.org/ [2] https://bugzilla.kernel.org/show_bug.cgi?id=220789 [3] https://gitlab.com/driverctl/driverctl/-/blob/0.121/driverctl?ref_type=tags#L99 Danilo Krummrich (12): amba: use generic driver_override infrastructure bus: fsl-mc: use generic driver_override infrastructure cdx: use generic driver_override infrastructure hv: vmbus: use generic driver_override infrastructure PCI: use generic driver_override infrastructure platform/wmi: use generic driver_override infrastructure rpmsg: use generic driver_override infrastructure vdpa: use generic driver_override infrastructure s390/cio: use generic driver_override infrastructure s390/ap: use generic driver_override infrastructure spi: use generic driver_override infrastructure driver core: remove driver_set_override() drivers/amba/bus.c | 37 +++------------ drivers/base/driver.c | 75 ------------------------------ drivers/bus/fsl-mc/fsl-mc-bus.c | 43 +++-------------- drivers/cdx/cdx.c | 40 ++-------------- drivers/hv/vmbus_drv.c | 36 ++------------ drivers/pci/pci-driver.c | 11 +++-- drivers/pci/pci-sysfs.c | 28 ----------- drivers/pci/probe.c | 1 - drivers/platform/wmi/core.c | 36 ++------------ drivers/rpmsg/qcom_glink_native.c | 2 - drivers/rpmsg/rpmsg_core.c | 43 +++-------------- drivers/rpmsg/virtio_rpmsg_bus.c | 1 - drivers/s390/cio/cio.h | 5 -- drivers/s390/cio/css.c | 34 ++------------ drivers/s390/crypto/ap_bus.c | 34 +++++++------- drivers/s390/crypto/ap_bus.h | 1 - drivers/s390/crypto/ap_queue.c | 24 +++------- drivers/spi/spi.c | 19 +++----- drivers/vdpa/vdpa.c | 48 ++----------------- drivers/vfio/fsl-mc/vfio_fsl_mc.c | 4 +- drivers/vfio/pci/vfio_pci_core.c | 5 +- drivers/xen/xen-pciback/pci_stub.c | 6 ++- include/linux/amba/bus.h | 5 -- include/linux/cdx/cdx_bus.h | 4 -- include/linux/device/driver.h | 2 - include/linux/fsl/mc.h | 4 -- include/linux/hyperv.h | 5 -- include/linux/pci.h | 6 --- include/linux/rpmsg.h | 4 -- include/linux/spi/spi.h | 5 -- include/linux/vdpa.h | 4 -- include/linux/wmi.h | 4 -- 32 files changed, 88 insertions(+), 488 deletions(-) base-commit: c369299895a591d96745d6492d4888259b004a9e -- 2.53.0