Get your vboxusers group ID # cat /etc/group | vboxusers
Remount the USBFS with your vboxusers GID # mount -t usbfs -o remount,devgid=GID,devmode=664 /proc/bus/usb /proc/bus/usb
This is the bit that won't work. The mount options seem to have no effect:
# ll /proc/bus total 0 dr-xr-xr-x 2 root root 0 Dec 8 16:51 input dr-xr-xr-x 2 root root 0 Dec 8 16:51 pccard dr-xr-xr-x 6 root root 0 Dec 8 12:09 pci drwxr-xr-x 7 root root 0 Dec 8 12:08 usb # ll /proc/bus/usb total 0 dr-xr-xr-x 2 root root 0 Dec 8 12:08 001 dr-xr-xr-x 2 root root 0 Dec 8 12:08 002 dr-xr-xr-x 2 root root 0 Dec 8 12:08 003 dr-xr-xr-x 2 root root 0 Dec 8 12:08 004 dr-xr-xr-x 2 root root 0 Dec 8 12:08 005 -r--r--r-- 1 root root 0 Dec 8 16:47 devices
Change the permissions on /dev/vboxdrv # chmod g+rw /dev/vboxdrv
This one is new to me ...
Restart the vboxdrv service # service vboxdrv restart
... and this one resets the permissions on /dev/vboxdrv to 600.