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[Launchpad Bug Tracker <1682215@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.8.0-52.55

---------------
linux (4.8.0-52.55) yakkety; urgency=low

  * linux: 4.8.0-52.55 -proposed tracker (LP: #1686976)

  * CVE-2017-7477: macsec: avoid heap overflow in skb_to_sgvec (LP: #1685892)
    - macsec: avoid heap overflow in skb_to_sgvec
    - macsec: dynamically allocate space for sglist

  * net/ipv4: original ingress device index set as the loopback interface.
    (LP: #1683982)
    - net: fix incorrect original ingress device index in PKTINFO

  * Touchpad not working correctly after kernel upgrade (LP: #1662589)
    - Input: ALPS - fix V8+ protocol handling (73 03 28)

  * ifup service of network device stay active after driver stop (LP: #1672144)
    - net: use net->count to check whether a netns is alive or not

  * [Hyper-V] mkfs regression in kernel 4.4+ (LP: #1682215)
    - block: relax check on sg gap

  * Potential memory corruption with capi adapters (LP: #1681469)
    - powerpc/mm: Add missing global TLB invalidate if cxl is active

  * [Hyper-V/Azure] Please include Mellanox OFED drivers in Azure kernel and
    image (LP: #1650058)
    - net/mlx4_en: Fix bad WQE issue
    - net/mlx4_core: Fix racy CQ (Completion Queue) free
    - net/mlx4_core: Fix when to save some qp context flags for dynamic VST to VGT
      transitions
    - net/mlx4_core: Avoid command timeouts during VF driver device shutdown

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Fri, 28 Apr 2017 12:17:12
+0200

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2017-7477

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https://bugs.launchpad.net/bugs/1682215

Title:
  [Hyper-V] mkfs regression in kernel 4.4+

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  Related bug:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1657539

  This issue was fixed in Zesty, but also impacts the Xenial and Yakkety
  kernels. Can you please pull this patch back to Xenial+?

  https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-
  block.git/commit/?h=for-4.11/block&id=729204ef49ec00b788ce23deb9eb922a5769f55d

  author
  Ming Lei <ming.lei@xxxxxxxxxxxxx>
  2016-12-17 10:49:09 (GMT)
  committer
  Jens Axboe <axboe@xxxxxx>
  2017-01-12 03:47:08 (GMT)
  commit
  729204ef49ec00b788ce23deb9eb922a5769f55d (patch)
  tree
  ab5cc3c0aa17fa8b988ed7dfefe888000fac0be3
  parent
  1661f2e21c8bbf922dcb76faf2126a33ffe4cddb (diff)
  block: relax check on sg gap
  If the last bvec of the 1st bio and the 1st bvec of the next
  bio are physically contigious, and the latter can be merged
  to last segment of the 1st bio, we should think they don't
  violate sg gap(or virt boundary) limit.

  Both Vitaly and Dexuan reported lots of unmergeable small bios
  are observed when running mkfs on Hyper-V virtual storage, and
  performance becomes quite low. This patch fixes that performance
  issue.

  The same issue should exist on NVMe, since it sets virt boundary too.

  Reported-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
  Reported-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
  Tested-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
  Cc: Keith Busch <keith.busch@xxxxxxxxx>
  Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
  Signed-off-by: Jens Axboe <axboe@xxxxxx>

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