[Bug 1767918] Re: Login password from GDM is shown in plain text on the VT1 console

[SimonWerner]

I have tested this with the new version of Plymouth and the problem is
not there.  I tested this by upgrading to the latest version Plymouth,
and rebooting.  Then trying to reproduce the problem by rebooting again
and pressing CTRL-ALT-F1.  My password was not shown in text mode.

However, I have tested this problem over the last few weeks (as I
created the upstream bug report,
https://gitlab.gnome.org/GNOME/gdm/issues/408) and I have never been
able to reproduce it.  My guess that I can't reproduce is hinted by this
comment:  "Our systems do often boot quick enough that Plymouth doesn't
have time to activate, too." made in the upstream bug report. Maybe
previously my system booted quicker/slower and I saw the password issue
and now it boots slower/quicker and I can't reproduce it.

Anyway, with the new version of Plymouth it seems to not be any worse.
It would be good if someone else could test it too.

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https://bugs.launchpad.net/bugs/1767918

Title:
  Login password from GDM is shown in plain text on the VT1 console

Status in gdm3 package in Ubuntu:
  Invalid
Status in plymouth package in Ubuntu:
  Fix Released
Status in gdm3 source package in Bionic:
  New
Status in plymouth source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  Sessions in specific circumstances when switching to TTY while plymouth is being activated or deactivated.

  [Test cases]
  Steps to reproduce:
  1) Log-in using X11 login via GDM.
  2) Use the desktop for a while.  (For some reason I cannot reproduce if I login and then restart after a short while).
  3) In Gnome click System menu -> Power Button -> Restart
  4) Quickly press CTRL-ALT-F1

  Validate whether your login password is visible on the TTY.

  [Regression Potential]
  Possible regressions may include difficulty showing text-mode splash or boot messages given that this changes the state of tty based on plymouth's own activation state.

  ---

  https://gitlab.gnome.org/GNOME/gdm/issues/408

  
  I don't which package this applies to, but I believe the best bet is GDM.

  Steps to reproduce:
  1) Log-in using X11 login via GDM.
  2) Use the desktop for a while.  (For some reason I cannot reproduce if I login and then restart after a short while).
  3) In Gnome click System menu -> Power Button -> Restart
  4) Quickly press CTRL-ALT-F1
  5) I see my login password in plain text in the console.  Once I saw the login password repeated twice.

  See attached photo with the login password blanked out.  Below the
  password is the console cursor.

  ## lsb_release -rd
  Description:	Ubuntu 18.04 LTS
  Release:	18.04

  ## apt-cache policy gdm3
  gdm3:
    Installed: 3.28.0-0ubuntu1
    Candidate: 3.28.0-0ubuntu1
    Version table:
   *** 3.28.0-0ubuntu1 500
          500 http://nz.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gdm3 3.28.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-18.19-generic 4.15.17
  Uname: Linux 4.15.0-18-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 30 14:54:07 2018
  InstallationDate: Installed on 2018-04-13 (17 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

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