[Bug 1832672] Re: systemd-resolve not ignoring comments in /etc/hosts

Tue Nov 26 17:37:57 UTC 2019

This bug was fixed in the package systemd - 237-3ubuntu10.33

---------------
systemd (237-3ubuntu10.33) bionic; urgency=medium

  * d/p/lp1852754/0001-network-do-not-re-set-MTU-when-current-and-requested.patch,
    d/p/lp1852754/0002-network-call-link_acquire_conf-and-link_enter_join_n.patch,
    d/p/lp1852754/0003-network-prohibit-to-set-MTUBytes-and-UseMTU-simultan.patch:
    - Complete link setup after setting mtu (LP: #1852754)

systemd (237-3ubuntu10.32) bionic; urgency=medium

  [ Victor Tapia ]
  * d/p/resolved_disable-connection-downgrade-when-DNSSEC-yes.patch
    Fix regression introduced by
    resolved-Mitigate-DVE-2018-0001-by-retrying-NXDOMAIN-with.patch when
    DNSSEC=yes (LP: #1796501)

  [ Dan Streetman ]
  * d/p/fix-typo-lp1668771-resolved-switch-cache-option-to-a-tri-state-option-s.patch:
    - Fix typo in previous patch
  * d/p/lp1840640-shared-seccomp-add-sync_file_range2.patch:
    - allow sync_file_range2 in nspawn container
      (LP: #1840640)
  * d/p/lp1783994-dissect-Don-t-count-RPMB-and-boot-partitions-8609.patch:
    - avoid systemd-gpt-auto-generator failure if mmc dev present
      (LP: #1783994)
  * d/p/lp1832672-resolved-rework-parsing-of-etc-hosts.patch:
    - do not fail entire file on error when parsing /etc/hosts
    - parse # char anywhere in line as start of comment
      (LP: #1832672)
  * d/p/lp1843381-dell_passthrough_skip_rename_retry.patch,
    debian/extra/rules/73-usb-net-by-mac.rules:
    - fix rename delay for systems using "Dell MAC passthrough"
      (LP: #1843381)
  * d/p/lp1849733/0001-resolved-longlived-TCP-connections.patch,
    d/p/lp1849733/0002-resolved-line-split-dns_stream_new-function-signatur.patch,
    d/p/lp1849733/0003-resolved-add-some-assert-s.patch,
    d/p/lp1849733/0004-stream-track-type-of-DnsStream-object.patch,
    d/p/lp1849733/0005-llmnr-add-comment-why-we-install-no-complete-handler.patch,
    d/p/lp1849733/0006-resolved-restart-stream-timeout-whenever-we-managed-.patch,
    d/p/lp1849733/0007-resolved-only-call-complete-with-zero-argument-in-LL.patch,
    d/p/lp1849733/0008-resolved-add-comment-to-dns_stream_complete-about-it.patch,
    d/p/lp1849733/0009-resolved-keep-stub-stream-connections-up-for-as-long.patch,
    d/p/lp1849733/0010-resolved-if-we-can-t-append-EDNS-OPT-RR-then-indicat.patch,
    d/p/lp1849733/0011-resolved-don-t-let-EDNS0-OPT-dgram-size-affect-TCP.patch,
    d/p/lp1849733/0012-resolved-add-new-accessor-dns_stream_take_read_packe.patch,
    d/p/lp1849733/0013-resolve-do-not-complete-stream-transaction-when-it-i.patch:
    - add TCP pipelining to handle getaddrinfo() fallback to TCP
    - ignore EDNS0 payload limit when responding over TCP (LP: #1849733)
  * d/p/lp1849658-resolved-set-stream-type-during-DnsStream-creation.patch:
    - Fix bug in refcounting TCP stream types (LP: #1849658)
  * d/p/lp1850704/0001-networkd-Unify-set-MTU.patch,
    d/p/lp1850704/0002-network-drop-redundant-lines.patch:
    - Fix setting mtu if interface already up (LP: #1850704)
  * d/extra/dhclient-enter-resolved-hook:
    - only restart resolved if dhclient conf changed (LP: #1805183)

 -- Dan Streetman <ddstreet at canonical.com>  Fri, 15 Nov 2019 10:01:16
-0500

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

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https://bugs.launchpad.net/bugs/1832672

Title:
  systemd-resolve not ignoring comments in /etc/hosts

Status in systemd:
  Unknown
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  [impact]

  resolved does not ignore comments properly in /etc/hosts

  [test case]

  see original description below

  [regression potential]

  as this modifies resolved parsing of /etc/hosts, regressions would
  likely be in hostname lookups from hosts in /etc/hosts, or failure(s)
  to parse /etc/hosts correctly.

  [other info]

  original description:
  ---

  $ lsb_release -rd
  Description:	Ubuntu 18.04.2 LTS
  Release:	18.04

  $ LANG=C apt-cache policy systemd
  systemd:
    Installed: 237-3ubuntu10.22
    Candidate: 237-3ubuntu10.22
    Version table:
   *** 237-3ubuntu10.22 500
          500 http://ch.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       237-3ubuntu10.19 500
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
       237-3ubuntu10 500
          500 http://ch.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://mirrors.kernel.org/ubuntu bionic/main amd64 Packages

  $ head -1 /etc/hosts
  127.0.2.1 foo # bar

  $ /usr/bin/systemd-resolve -4 bar

  expected
  ----------
  bar: resolve call failed: 'bar' not found

  What happened instead
  ---------------------
  bar: 127.0.2.1

  HOSTS(5)
  > Text from a "#" character until the end of the line is a comment, and is ignored.

  This is fixed in upstream:
  https://github.com/systemd/systemd/issues/10779
  https://github.com/systemd/systemd/commit/bd0052777981044cf54a1e9d6e3acb1c3d813656

  Please backport to current LTS version.
  I accidentally connected to wrong systems because of this bug.

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