linux-kernel - Bluetooth HID devices not getting properly removed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 24 Jun 2009 13:11:14 +0200
From:	Thomas Bächler <thomas@...hlinux.org>
To:	linux-kernel@...r.kernel.org
Subject: Bluetooth HID devices not getting properly removed

I am unsure where to put this bug, because it actually manifests inside 
HAL. I think the bluetooth hid driver is at fault, because there is an 
inconsistency in uevents between USB and bluetooth mice.

So this is what happens: When I add a bluetooth mouse, udev receives 
certain uevents, this is an excerpt from udevadm monitor:

KERNEL[1245834026.993304] add 
/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/bluetooth/hci0/hci0:11 
(bluetooth)
KERNEL[1245834027.252241] add 
/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/bluetooth/hci0/hci0:11/0005:046D:B002.0005 
(hid)
KERNEL[1245834027.252301] add 
/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/bluetooth/hci0/hci0:11/input12 
(input)

Pay attention to the input device, it is added with a full device path. 
When removing the mouse, this happens:

KERNEL[1245834012.631443] remove 
/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/bluetooth/hci0/hci0:11 
(bluetooth)
KERNEL[1245834012.632668] remove   /hci0:11/input12/mouse2 (input)
KERNEL[1245834012.641797] remove   /hci0:11/input12/event8 (input)
KERNEL[1245834012.655447] remove   /hci0:11/input12 (input)
KERNEL[1245834012.655502] remove   /hci0:11/0005:046D:B002.0004 (hid)

See how the device path of the removed input devices is truncated? When 
I do the same with a USB mouse, a full device path is returned each time.

All of this results in hal not removing its logical input device, which 
means the number of (non-existent) mice in the hal device tree increases 
whenever I disable and re-enable my mouse.

So where do I put this bug? Linux? Bluez? Udev? Hal? My guess is Linux, 
as these device paths come from Linux originally and are in fact 
inconsistent. This is all tested on 2.6.30, I have no idea if it was the 
case on older kernels.

Please CC me on replies.

Download attachment "signature.asc" of type "application/pgp-signature" (261 bytes)