[Bug 1522313] Re: Wrong /dev/null permissions after boot

[Martin Pitt]

MODE 0660 /etc/udev/rules.d/88-andor-luca.rules:5
MODE 0660 /etc/udev/rules.d/88-keysight-xseries-siggen.rules:5
MODE 0660 /etc/udev/rules.d/88-thorlabs-ccs.rules:8
MODE 0660 /etc/udev/rules.d/88-thorlabs-fw102.rules:5
MODE 0660 /etc/udev/rules.d/88-thorlabs-mff101.rules:5
MODE 0660 /etc/udev/rules.d/88-thorlabs-pm100.rules:5
handling device node '/dev/null', devnum=c1:3, mode=0660, uid=0, gid=0

Your custom rules there mess up /dev/null, please fix those.

** Changed in: systemd (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1522313

Title:
  Wrong /dev/null permissions after boot

Status in systemd package in Ubuntu:
  Invalid

Bug description:
  After running update today (on Ubuntu 15.10) and rebooting the OS
  lightdm would not start. After some debugging I noticed that /dev/null
  (and some other /dev files) do not have adequate permissions (compared
  to another Ubuntu box I have) - e.g. 'others' could not read nor write
  /dev/null.

  After 'chmod a+rw' offending files, lightdm started up. Of course this
  is not reboot persistent so I need to put this in some /etc/rc.* to
  make it stick - which I do not want to!

  To fix this problem after reboots I added /etc/init.d/fix-dev.sh
  script with contents, and symlink to /etc/rcS.d/S14fix-dev.sh (last
  entry):

  chmod a+rw /dev/null /dev/random /dev/urandom /dev/ptmx /dev/tty
  /dev/zero /dev/full /dev/fuse /dev/net/tun

  My system now starts the lightdm as it did before.

  $ lsb_release -rd
  Description:	Ubuntu 15.10
  Release:	15.10

  apt-cache policy udev
  udev:
    Installed: 225-1ubuntu9
    Candidate: 225-1ubuntu9
    Version table:
   *** 225-1ubuntu9 0
          500 http://se.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
          100 /var/lib/dpkg/status

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