Comment 0 for bug 1729354

Test Case
=========
Steps to Reproduce:
1. Enable Automatic Login for your account
2. Reboot
3. Lock screen
4. Click on the log in as another user button below the password prompt.

Actual results:
The screen unlocks without a password being entered.

Expected results:
A selection of other accounts is shown.

Other Info
==========
Cherry-picking this commit:
https://git.gnome.org/browse/gdm/commit/?id=16f646

Introduced in
https://git.gnome.org/browse/gdm/commit/?id=ff98b28

Therefore, this should only affect Ubuntu 17.04. Ubuntu GNOME was the only Ubuntu flavor to ship GDM by default in 17.04.

https://security-tracker.debian.org/tracker/CVE-2017-12164