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[Launchpad Bug Tracker <1398596@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.18.0-8.9

---------------
linux (3.18.0-8.9) vivid; urgency=low

  [ Leann Ogasawara ]

  * Release Tracking Bug
    - LP: #1407692
  * rebase to v3.18.1
  * ubuntu: AUFS -- Resolve build failure union has no member named
    'd_child'

  [ Upstream Kernel Changes ]

  * arm64: optimized copy_to_user and copy_from_user assembly code
    - LP: #1400349
  * x86, kvm: Clear paravirt_enabled on KVM guests for espfix32's benefit
    - LP: #1400314
    - CVE-2014-8134
  * rebase to v3.18.1
 -- Leann Ogasawara <leann.ogasawara@xxxxxxxxxxxxx>   Mon, 05 Jan 2015 09:12:32 -0800

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2014-8134

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https://bugs.launchpad.net/bugs/1398596

Title:
  [Revert] arm64: optimized copy_to_user and copy_from_user assembly
  code

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Utopic:
  Triaged

Bug description:
  [Impact]
  Fixes an issue where the kernel hits unhandled pagefaults when copy_to_user is called.

  http://www.spinics.net/lists/arm-kernel/msg381811.html

  [Test Case]
  Put the system under memory pressure.

  [Regression Potential]
  It will cause a performance regression on certain workloads on arm64 systems.

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