Branch: refs/heads/master Home: https://github.com/bluez/bluez Commit: 8d472b8758dcdd89bf13cf2fb06a8846e1f483a0 https://github.com/bluez/bluez/commit/8d472b8758dcdd89bf13cf2fb06a8846e1f483a0 Author: Andrew Sayers <kernel.org@xxxxxxxxxxxxxxx> Date: 2025-04-18 (Fri, 18 Apr 2025) Changed paths: M obexd/src/obex.service.in Log Message: ----------- obexd: only run one instance at once Obex is a device-oriented protocol, so only one instance can run per device. But Linux file security is user-oriented, so obexd should be a user service. Tell systemd to only run this service for the first non-system user to log in. Without this patch, errors like the following will occur if you use the "switch account" feature of your desktop environment, then log in with another account: Mar 26 15:20:38 andrews-2024-laptop bluetoothd[873]: src/profile.c:register_profile() :1.2016 tried to register 00001133-0000-1000-8000-00805f9b34fb which is already registered Mar 26 15:20:38 andrews-2024-laptop bluetoothd[873]: src/profile.c:register_profile() :1.2016 tried to register 00001132-0000-1000-8000-00805f9b34fb which is already registered Mar 26 15:20:38 andrews-2024-laptop bluetoothd[873]: src/profile.c:register_profile() :1.2016 tried to register 0000112f-0000-1000-8000-00805f9b34fb which is already registered Mar 26 15:20:38 andrews-2024-laptop bluetoothd[873]: src/profile.c:register_profile() :1.2016 tried to register 00001104-0000-1000-8000-00805f9b34fb which is already registered Mar 26 15:20:38 andrews-2024-laptop bluetoothd[873]: src/profile.c:register_profile() :1.2016 tried to register 00001106-0000-1000-8000-00805f9b34fb which is already registered Mar 26 15:20:38 andrews-2024-laptop bluetoothd[873]: src/profile.c:register_profile() :1.2016 tried to register 00001105-0000-1000-8000-00805f9b34fb which is already registered Mar 26 15:20:38 andrews-2024-laptop bluetoothd[873]: src/profile.c:register_profile() :1.2016 tried to register 00005005-0000-1000-8000-0002ee000001 which is already registered Mar 26 15:20:38 andrews-2024-laptop obexd[1795560]: bluetooth: RequestProfile error: org.bluez.Error.NotPermitted, UUID already registered Mar 26 15:20:38 andrews-2024-laptop obexd[1795560]: bluetooth: RequestProfile error: org.bluez.Error.NotPermitted, UUID already registered Mar 26 15:20:38 andrews-2024-laptop obexd[1795560]: bluetooth: RequestProfile error: org.bluez.Error.NotPermitted, UUID already registered Mar 26 15:20:38 andrews-2024-laptop obexd[1795560]: bluetooth: RequestProfile error: org.bluez.Error.NotPermitted, UUID already registered Mar 26 15:20:38 andrews-2024-laptop obexd[1795560]: bluetooth: RequestProfile error: org.bluez.Error.NotPermitted, UUID already registered Mar 26 15:20:38 andrews-2024-laptop obexd[1795560]: bluetooth: RequestProfile error: org.bluez.Error.NotPermitted, UUID already registered Mar 26 15:20:38 andrews-2024-laptop obexd[1795560]: bluetooth: RequestProfile error: org.bluez.Error.NotPermitted, UUID already registered The above errors indicate the service completely failed to register, so this does not change the user experience beyond removing the above messages. Specifically, the first user who logs in to a multi-user system still retains obex access to devices paired by users who log in later. This is based on a pair of recent changes to the FluidSynth daemon: https://github.com/FluidSynth/fluidsynth/pull/1491 https://github.com/FluidSynth/fluidsynth/pull/1528 This was discussed in the comments for a GitHub advisory available at https://github.com/bluez/bluez/security/advisories/GHSA-fpgq-25xf-jcwv but comments are not shown in the published version of the advisory. To summarise the useful conversation with Luiz Augusto von Dentz: Obex requires access to the user's home directory, so an attacker can only transfer files between locations the user controls. That may be a problem if the user who runs obexd is different to the user who paired the device, but solving that would involve pairing per-user, which causes other problems. Bluetooth connections can be initiated by peripherals, so switching user could trigger re-pairing and cause the original user to lose access to the device. This may seem reasonable for file access, but for example users would likely object to constantly re-pairing their Bluetooth keyboard. To unsubscribe from these emails, change your notification settings at https://github.com/bluez/bluez/settings/notifications
