uml-utilities conflicts with udev

[PtOLU8zjbZxlgNOiyGyd]

Binary package hint: uml-utilities

uml-utilites is somewhat broken when used with udev. It sets permissions on /dev/net/tun with a hack in /etc/network/if-pre-up.d/uml-utilities that reads (commented out as I have already applied the proposed fix to my running system):

#
# why the hell does this need to be done?
#
#chown root:uml-net /dev/net/tun
#chmod 660 /dev/net/tun

This has the inconveniece that as soon as udev loads or unloads a different module (say for a USB flash key) tun permissions immediately return to root:root

The solution is to replace that hack with a udev rules file with the proper permissions:

#/etc/udev/rules.d/40-uml-utilities.rules
KERNEL=="tun", GROUP="uml-net", MODE="0660"

[Dyno (dyno-fu)]

and even the rules is added it still may not work, check this link https://wiki.ubuntu.com/VirtualboxHostNetworkingAndWIFI, and the excerpt.

"""
UPDATE July 29: it seems that since a few updates (don't know which one unfortunately) the ownership of /dev/net/tun is reverted to root:root after each reboot so we have to chown and chmod everytime. There must be a rule in udev that we can change or create a script and link it in /etc/rc2.d. I am okay to change a udev rule IF it works, so far it does not.
Personally, I changed the ownership of /lib/udev/devices/net/tun so that /net/dev/tun is created (copied apparently) with the correct permissions. (reboot necessary afterwards unless someone has another solution)

sudo chgrp uml-net /lib/udev/devices/net/tun
sudo chmod g+rw /lib/udev/devices/net/tun
"""