[Bug 1452099] [NEW] unshare -r is broken

[Anders Kaseorg]

Public bug reported:

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.

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: util-linux (Debian)
     Importance: Unknown
         Status: Unknown

** Bug watch added: Debian Bug tracker #780841
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780841

** Also affects: util-linux (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780841
   Importance: Unknown
       Status: Unknown

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

Title:
  unshare -r is broken

Status in util-linux package in Ubuntu:
  New
Status in util-linux package in Debian:
  Unknown

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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