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[Launchpad Bug Tracker <1357025@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.16.0-9.14

---------------
linux (3.16.0-9.14) utopic; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1357370

  [ Serge Hallyn ]

  * SAUCE: Overlayfs: allow unprivileged mounts
    - LP: #1357025

  [ Upstream Kernel Changes ]

  * MAINTAINERS: Add entry for APM X-Gene SoC ethernet driver
  * Documentation: dts: Add bindings for APM X-Gene SoC ethernet driver
  * dts: Add bindings for APM X-Gene SoC ethernet driver
  * drivers: net: Add APM X-Gene SoC ethernet driver support.
  * powerpc/thp: Add write barrier after updating the valid bit
    - LP: #1357014
  * powerpc/thp: Don't recompute vsid and ssize in loop on invalidate
    - LP: #1357014
  * powerpc/thp: Invalidate old 64K based hash page mapping before insert
    of 4k pte
    - LP: #1357014
  * powerpc/thp: Handle combo pages in invalidate
    - LP: #1357014
  * powerpc/thp: Invalidate with vpn in loop
    - LP: #1357014
  * powerpc/thp: Use ACCESS_ONCE when loading pmdp
    - LP: #1357014
  * powerpc/mm: Use read barrier when creating real_pte
    - LP: #1357014
  * powerpc/thp: Add tracepoints to track hugepage invalidate
    - LP: #1357014
  * rebase to v3.16.1
 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>   Thu, 14 Aug 2014 08:18:02 -0400

** Changed in: linux (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1357025

Title:
  unprivileged overlayfs mounts no longer work in utopic

Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  In 3.13.0-33-generic, root in a non-init user namespace can do
  overlayfs mounts.  In 3.16.0-5-generic he cannot.

  Test case:

  sudo apt-get install lxc
  lxc-usernsexec  -- /bin/bash    # start a containerized root shell
  #  mkdir /tmp/a /tmp/b /tmp/c
  # mount -t overlayfs -o upperdir=/tmp/a,lowerdir=/tmp/b x /tmp/c

  This works in trusty, but not in latest utopic.

  (A testcase for this will be added to the lxc-tests package, but isn't
  there yet)

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