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[Launchpad Bug Tracker <1452099@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package util-linux - 2.26.2-2ubuntu2

---------------
util-linux (2.26.2-2ubuntu2) wily; urgency=medium

  * Version the Breaks: cloud-utils as 0.27-0ubuntu16 now works with
    util-linux 2.26, and also move it to cloud-guest-utils.

util-linux (2.26.2-2ubuntu1) wily; urgency=medium

  * Merge from Debian unstable.  Remaining changes:
    - Regularly trim SSDs automatically (core-1311-ssd-trimming):
      + Add debian/fstrim-all.cron: Call fstrim --all. Installed as
        /etc/cron.weekly/fstrim.
    - Upstart support:
      + Add hwclock{-save}.upstart, and install them in debian/rules.
      + Drop debian/hwclock.rules and hwclock.default.
    - Add mountall-options.patch, see patch header.
    - Add debian/libblkid1.maintscript to clean up /etc/blkid.conf on upgrade.
      This needs to be kept until after Ubuntu 16.04 LTS.
    - Add libudev-dev build dependency for enabling LABEL information in lsblk
      (Closes: #776905)
  * This version fixes unshare -r (LP: #1452099)

 -- Martin Pitt <martin.pitt@xxxxxxxxxx>  Tue, 12 May 2015 05:42:07
+0200

** Changed in: util-linux (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1452099

Title:
  unshare -r is broken

Status in util-linux package in Ubuntu:
  Fix Released
Status in util-linux package in Debian:
  Fix Released

Bug description:
  After CVE-2014-8989 was fixed in Linux v3.19-rc1~41, ‘unshare -r’ no
  longer works.

  $ unshare -Ur
  unshare: write failed /proc/self/gid_map: Operation not permitted
  $ sudo -i
  # unshare -r
  unshare: write failed /proc/self/gid_map: Operation not permitted

  This was fixed in Debian’s util-linux 2.25.2-6.

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