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[Launchpad Bug Tracker <1844853@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package glib2.0 - 2.56.4-0ubuntu0.18.04.5

---------------
glib2.0 (2.56.4-0ubuntu0.18.04.5) bionic; urgency=medium

  [ Gunnar Hjalmarsson ]
  * d/p/gcredentialsprivate-Document-the-various-private-macros.patch,
    d/p/credentials-Invalid-Linux-struct-ucred-means-no-informati.patch,
    d/p/GDBus-prefer-getsockopt-style-credentials-passing-APIs.patch:
    - Ensure libdbus clients can authenticate with a GDBusServer like
      the one in ibus. The patches cherry picked from 2.62.2-2 in focal
      in order to allow the ibus fix of CVE-2019-14822 to be re-enabled
      without breaking ibus for Qt applications (LP: #1844853).

  [ Iain Lane ]
  * d/p/Add-a-test-for-GDBusServer-authentication.patch: Additionally backport
    this commit to add a test for the above fixes.
    + BD on libdbus-1-dev so that the above test gets run properly.

 -- Gunnar Hjalmarsson <gunnarhj@xxxxxxxxxx>  Thu, 31 Oct 2019 00:16:00
+0100

** Changed in: glib2.0 (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

** Changed in: glib2.0 (Ubuntu Eoan)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1844853

Title:
  IBus no longer works in Qt applications after upgrade

Status in GLib:
  Fix Released
Status in ibus:
  Fix Released
Status in glib2.0 package in Ubuntu:
  Fix Released
Status in ibus package in Ubuntu:
  Fix Released
Status in glib2.0 source package in Xenial:
  Fix Released
Status in glib2.0 source package in Bionic:
  Fix Released
Status in glib2.0 source package in Disco:
  Won't Fix
Status in glib2.0 source package in Eoan:
  Fix Released
Status in glib2.0 source package in Focal:
  Fix Released
Status in ibus source package in Focal:
  Fix Released
Status in glib2.0 package in Debian:
  Fix Released

Bug description:
  [Impact]

  IBus was broken for Qt applications as a regression due to the fix of
  CVE-2019-14822. As a result the IBus patch was disabled temporarily,
  which fixed IBus from a usability POV.

  The real fix has been made in glib2.0, and the updates in -proposed
  will allow the IBus patch to be re-enabled.

  [Test Case]

   * On a standard Ubuntu {eoan,disco,bionic,xenial} installation
     - Upgrade the glib2.0 packages from
       {eoan,disco,bionic,xenial}-proposed
     - Upgrade the ibus packages from
       https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa
     - Install some IBus input method, e.g. ibus-libpinyin
     - Install some Qt application, e.g. Kate

  * Relogin (maybe reboot)

  * Add the input method to the input sources

  * Open the Qt app and try to input something using the IBus IM

  => Find that the transliteration works as expected

  [Regression Potential]

  The applicable patches origin from glib upstream:
  https://gitlab.gnome.org/GNOME/glib/merge_requests/1176
  Consequently the changes have been reviewed by the glib maintainer, but also tested by the IBus maintainer, by me (gunnarhj), and - of course - the author Simon McVittie. The changes have been in Debian unstable since 2019-10-30.

  [Original description]

  Kubuntu Release 18.04.3 LTS

  Expected behavior:
  ibus continues working as before after applying security update 1.5.17-ubuntu5.1 from version 1.5.17-ubuntu5.

  Observed behavior:
  ibus is not usable anymore in Qt applications.

  After updating ibus and the related packages ibus-gtk, ibus-gtk3, libibus-1.0-5 and gir1.2-ibus-1.0 all from version 1.5.17-ubuntu5 to 1.5.17-ubuntu5.1, I can no longer use ibus in Qt applications. Using shift-space no longer changes the selected input method and even when i switch to the mozc input method in a gtk application, i can not use it in any Qt applications.
  When starting qtconfig in a terminal, I also get the following message:

  Bus::open: Connect ibus failed!
  IBusInputContext::createInputContext: no connection to ibus-daemon

  This bug was not present in version 1.5.17-3ubuntu5 and I also
  confirmed that downgrading the packages to version 1.5.17-3ubuntu4
  restores ibus functionality in Qt applications.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ibus 1.5.17-3ubuntu5.1
  ProcVersionSignature: Ubuntu 5.0.0-30.32~18.04.1-generic 5.0.21
  Uname: Linux 5.0.0-30-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Sat Sep 21 07:58:56 2019
  InstallationDate: Installed on 2019-06-28 (84 days ago)
  InstallationMedia: Kubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  SourcePackage: ibus
  UpgradeStatus: No upgrade log present (probably fresh install)

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