The attachment "patch file fix /usr/sbin/guest-account" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu- reviewers, unsubscribe the team.
[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.] ** Tags added: patch -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1556516 Title: passwd and group entries are not removed on logout from a guest session Status in lightdm package in Ubuntu: New Bug description: When a guest session is finished, the guest-xxxx entries don't get removed from /etc/passwd and /etc/group (at least they don't always get removed). The problem is that the userdel command in the /usr/sbin/guest-account script fails because some of the guest processes are not yet dead at the time that it runs. An earlier line in the script uses loginctl to tell systemd to kill the guest's processes, but this isn't completed by the time that userdel runs. The simplest fix is to just call userdel with the --force flag, so that it removes the password and group entries even if the processes are still there. This doesn't cause any problems. The lingering guest-xxxx processes are gone by the time you log in as a regular user. A trivial patch file for /usr/sbin/guest-account is attached. Also, the 2008 copyright at the top of the file should really be updated! I don't think that loginctl existed in 2008 (ah, the good ole days :) Here is the tail of some debugging output that I obtained by modifying /usr/sbin/guest-account so that I could see what it was going on. This confirms the behavior that I mentioned above. + GUEST_HOME=/tmp/guest-8iwujo + [ -x /bin/loginctl ] + loginctl kill-user guest-8iwujo + [ /tmp/guest-8iwujo = guest-8iwujo ] + umount /tmp/guest-8iwujo umount: /tmp/guest-8iwujo: target is busy (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1).) + umount -l /tmp/guest-8iwujo + umount /tmp/guest-8iwujo umount: /tmp/guest-8iwujo: not mounted + umount -l /tmp/guest-8iwujo umount: /tmp/guest-8iwujo: not mounted + true + umount /tmp/guest-8iwujo umount: /tmp/guest-8iwujo: not mounted + umount -l /tmp/guest-8iwujo umount: /tmp/guest-8iwujo: not mounted + true + rm -rf /tmp/guest-8iwujo + xargs -0 rm -rf + find /tmp -mindepth 1 -maxdepth 1 -uid 999 -print0 + [ -d /run/media/guest-8iwujo ] + [ -d /media/guest-8iwujo ] + ps -lww -u guest-8iwujo F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 0 S 999 7128 1 0 80 0 - 88460 poll_s ? 00:00:00 at-spi-bus-laun 0 R 999 7214 1 0 80 0 - 162593 - ? 00:00:00 nm-applet 0 R 999 7222 1 1 80 0 - 138676 - ? 00:00:00 tilda + userdel guest-8iwujo userdel: user guest-8iwujo is currently used by process 7128 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1556516/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
