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 <x...@ubuntu.com> 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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