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[Launchpad Bug Tracker <1683976@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.13.0-119.166

---------------
linux (3.13.0-119.166) trusty; urgency=low

  * linux: 3.13.0-119.166 -proposed tracker (LP: #1687718)

  * CVE-2016-8645: Linux kernel mishandles socket buffer (skb) truncation
    (LP: #1687107)
    - rose: limit sk_filter trim to payload
    - tcp: take care of truncations done by sk_filter()

linux (3.13.0-118.165) trusty; urgency=low

  * linux: 3.13.0-118.165 -proposed tracker (LP: #1686154)

  * linux_3.13.0-*.*: nVMX: Check current_vmcs12 before accessing in
    handle_invept() (LP: #1678676)
    - SAUCE: KVM has a flaw in INVEPT emulation that could crash the host

  * Please backport fix to reference leak in cgroup blkio throttle
    (LP: #1683976)
    - block: fix module reference leak on put_disk() call for cgroups throttle

 -- Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>  Tue, 02 May
2017 15:14:50 -0300

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-8645

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https://bugs.launchpad.net/bugs/1683976

Title:
  Please backport fix to reference leak in cgroup blkio throttle

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  This is fixed in Linux 4.5
  https://github.com/torvalds/linux/commit/39a169b62b415390398291080dafe63aec751e0a

  Basically the module reference will leak whenever you write to
  /sys/fs/cgroup/blkio/blkio.throttle.*

  $ uname -a
  Linux david-kvm 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
  $ lsmod | grep ^zfs
  zfs                  2813952  1
  $ sudo sh -c 'i=100; while [ $i -gt 0 ]; do echo "230:0 1024" > /sys/fs/cgroup/blkio/blkio.throttle.read_bps_device; i=$(($i - 1)); done'
  $ lsmod | grep ^zfs
  zfs                  2813952  101

  This patch should be applied to all kernel < 4.5

  Thanks

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