This is the follow-up of the driver_override generalization in [1], converting the remaining 4 busses and removing the now-unused driver_set_override() helper.
All of them 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. This series is based on v7.1-rc1 with no additional dependencies, hence those patches can be picked up by subsystems individually. [1] https://lore.kernel.org/driver-core/[email protected]/ [2] https://bugzilla.kernel.org/show_bug.cgi?id=220789 [3] https://gitlab.com/driverctl/driverctl/-/blob/0.121/driverctl?ref_type=tags#L99 Changes in v2: - Rebase on v7.1-rc1 - Drop already merged patches - vmbus documentation changes as requested by Michael Danilo Krummrich (5): amba: use generic driver_override infrastructure cdx: use generic driver_override infrastructure Drivers: hv: vmbus: use generic driver_override infrastructure rpmsg: use generic driver_override infrastructure driver core: remove driver_set_override() drivers/amba/bus.c | 37 +++------------ drivers/base/driver.c | 75 ------------------------------- drivers/cdx/cdx.c | 40 +++-------------- drivers/hv/vmbus_drv.c | 43 +++++------------- drivers/rpmsg/qcom_glink_native.c | 2 - drivers/rpmsg/rpmsg_core.c | 43 +++--------------- drivers/rpmsg/virtio_rpmsg_bus.c | 1 - include/linux/amba/bus.h | 5 --- include/linux/cdx/cdx_bus.h | 4 -- include/linux/device/driver.h | 2 - include/linux/hyperv.h | 5 --- include/linux/rpmsg.h | 4 -- 12 files changed, 28 insertions(+), 233 deletions(-) base-commit: 254f49634ee16a731174d2ae34bc50bd5f45e731 -- 2.54.0
