Public bug reported:
To reproduce on a fresh install of ubuntu mate 16.04 start lightdm-gtk-
greeter-settings and authenticate to start editing lightdm settings.
Please do not try to reproduce this on a production machine as it will
involve locking yourself out of lightdm. In the settings for lightdm
GTK+ greeter settings select a really large image from a digial camera
or high resolution screenshot as your user image that is larger than
your screen resolution hit save and then log out. You will be taken to a
lightdm screen that has a user image so large you cannot login.
Description: Ubuntu Xenial Xerus (development branch)
Release: 16.04
lightdm-gtk-greeter-settings:
Installed: 1.2.0-0ubuntu1
Candidate: 1.2.0-0ubuntu1
Version table:
*** 1.2.0-0ubuntu1 0
500 http://us.archive.ubuntu.com/ubuntu/ xenial/universe amd64 Packages
100 /var/lib/dpkg/status
I would expect the greeter to check that it would not set such redicolous file
sizes that block the user from logging in or at least provide a warning dialog
that this could make you unable to login similar to things that cause data loss
on a partition in ubuquity or gparted. As this prevents even loggin into guest
session graphically. I did manage to get back in editing
/etc/lightdm/lightdm-gtk-greeter.conf by hand with vim.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm-gtk-greeter-settings 1.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.2-0ubuntu1
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Nov 3 22:51:13 2015
InstallationDate: Installed on 2015-11-03 (0 days ago)
InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151103)
PackageArchitecture: all
SourcePackage: lightdm-gtk-greeter-settings
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: lightdm-gtk-greeter-settings (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1512963
Title:
settings allow arbitarly large user pictures which makes the user lock
themselves out at lightdm.
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