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This bug was fixed in the package systemd - 229-4ubuntu20

---------------
systemd (229-4ubuntu20) xenial; urgency=medium

  * resolved: recognize DNS names with more than one trailing dot as invalid
    (LP: #1600000)
  * Ignore failures to set Nice priority on services in containers.
    (LP: #1709536)
  * networkd: accept `:' in ifnames in systemd/networkd. (LP: #1714933)
  * initramfs-tools: trigger udevadm add actions with subsystems first.
    (LP: #1713536)
  * networkd: Add support to set STP value on a bridge. (LP: #1665088)
  * networkd: add support for AgeingTImeSec, Priority and DefaultPVID settings.
    (LP: #1715131)
    - Drop cherrypick of uint16 config parser, superseeded by above commit.
  * networkd: add support to set ActiveSlave and PrimarySlave. (LP: #1709135)
    - networkd: add support to configure ARP, depedency of Primary/ActiveSlave.

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Tue, 05 Sep 2017 14:01:51
+0100

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1600000

Title:
  libnss-resolve treats two trailing dots on a domain name incorrectly

Status in systemd:
  New
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  libnss-resolve is an optional component not used by default in xenial. However it treats doubledot incorrectly, meaning it gets resolved when it shouldn't.

  [Fix]
  Cherrypick upstream patch to resolve this issue.

  [Testcase]

  * Enable resolve nss module
  * attempt resolving www.gnu.org..
  * It should fail to resolve

  (base)adconrad@nosferatu:~$ getent ahostsv4 www.gnu.org..
  208.118.235.148 STREAM wildebeest.gnu.org
  208.118.235.148 DGRAM
  208.118.235.148 RAW
  (base)adconrad@nosferatu:~$ sudo sed -i -e 's/ resolve dns/ dns/' /etc/nsswitch.conf
  (base)adconrad@nosferatu:~$ getent ahostsv4 www.gnu.org..
  (base)adconrad@nosferatu:~$ sudo sed -i -e 's/ dns/ resolve dns/' /etc/nsswitch.conf
  (base)adconrad@nosferatu:~$ getent ahostsv4 www.gnu.org..
  208.118.235.148 STREAM wildebeest.gnu.org
  208.118.235.148 DGRAM
  208.118.235.148 RAW
  (base)adconrad@nosferatu:~$

  This is responsible for the new regression in glibc:

  ----------
  FAIL: posix/tst-getaddrinfo5
  original exit status 1
  resolving "localhost." worked, proceeding to test
  resolving "localhost.." failed, test passed
  resolving "www.gnu.org." worked, proceeding to test
  resolving "www.gnu.org.." worked, test failed
  ----------

  [Regression potential]
  Minimal, since this component is not used by default. However, systems that have this enabled exhibit standards non-compliant behavior. It is not expected for anybody to depend on this broken behavior.

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