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[Launchpad Bug Tracker <1700373@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package intel-microcode -
3.20170511.1~ubuntu17.04.0

---------------
intel-microcode (3.20170511.1~ubuntu17.04.0) zesty; urgency=medium

  * Backport of new upstream microde release to address Hyper Threading
    bug. LP: #1700373.

intel-microcode (3.20170511.1) unstable; urgency=medium

  * New upstream microcode datafile 20170511
    + Updated Microcodes:
      sig 0x000306c3, pf_mask 0x32, 2017-01-27, rev 0x0022, size 22528
      sig 0x000306d4, pf_mask 0xc0, 2017-01-27, rev 0x0025, size 17408
      sig 0x000306f2, pf_mask 0x6f, 2017-01-30, rev 0x003a, size 32768
      sig 0x000306f4, pf_mask 0x80, 2017-01-30, rev 0x000f, size 16384
      sig 0x00040651, pf_mask 0x72, 2017-01-27, rev 0x0020, size 20480
      sig 0x00040661, pf_mask 0x32, 2017-01-27, rev 0x0017, size 24576
      sig 0x00040671, pf_mask 0x22, 2017-01-27, rev 0x0017, size 11264
      sig 0x000406e3, pf_mask 0xc0, 2017-04-09, rev 0x00ba, size 98304
      sig 0x000406f1, pf_mask 0xef, 2017-03-01, rev 0xb000021, size 26624
      sig 0x000506e3, pf_mask 0x36, 2017-04-09, rev 0x00ba, size 98304
    + This release fixes undisclosed errata on the desktop, mobile and
      server processor models from the Haswell, Broadwell, and Skylake
      families, including even the high-end multi-socket server Xeons
    + Likely fix the TSC-Deadline LAPIC errata (BDF89, SKL142 and
      similar) on several processor families
    + Fix erratum BDF90 on Xeon E7v4, E5v4(?) (closes: #862606)
    + Likely fix serious or critical Skylake errata: SKL138/144,
      SKL137/145, SLK149
    * Likely fix nightmare-level Skylake erratum SKL150.  Fortunately,
      either this erratum is very-low-hitting, or gcc/clang/icc/msvc
      won't usually issue the affected opcode pattern and it ends up
      being rare.
      SKL150 - Short loops using both the AH/BH/CH/DH registers and
      the corresponding wide register *may* result in unpredictable
      system behavior.  Requires both logical processors of the same
      core (i.e. sibling hyperthreads) to be active to trigger, as
      well as a "complex set of micro-architectural conditions"
  * source: remove unneeded intel-ucode/ directory
    Since release 20170511, upstream ships the microcodes both in .dat
    format, and as Linux-style split /lib/firmware/intel-ucode files.
    It is simpler to just use the .dat format file for now, so remove
    the intel-ucode/ directory. Note: before removal, it was verified
    that there were no discrepancies between the two microcode sets
    (.dat and intel-ucode/)
  * source: remove superseded upstream data file: 20161104

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Mon, 26 Jun 2017 16:22:13
+0100

** Changed in: intel-microcode (Ubuntu Zesty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1700373

Title:
  intel-microcode is out of date, version 20170511 fixes errata on 6th
  and 7th generation platforms

Status in intel-microcode package in Ubuntu:
  Fix Released
Status in intel-microcode source package in Trusty:
  Won't Fix
Status in intel-microcode source package in Xenial:
  Confirmed
Status in intel-microcode source package in Yakkety:
  Confirmed
Status in intel-microcode source package in Zesty:
  Fix Released
Status in intel-microcode source package in Artful:
  Fix Released

Bug description:
  [Impact]

  * A security fix has been made available as part of intel-microcode
  * It is advisable to apply it
  * Thus an SRU of the latest intel-microcode is desirable for all stable releases

  [Test Case]

  * Upgrade intel-microcode package, if it is already installed / one is
  running on Intel CPUs

  * Reboot and verify no averse results, and/or that microcode for your
  cpu was loaded as expected.

  [Test case reporting]
  * Please paste the output of:

  dpkg-query -W intel-microcode
  grep -E 'model|stepping' /proc/cpuinfo | sort -u
  journalctl -k | grep microcode

  [Regression Potential]
  Microcode are proprietary blobs, and can cause any number of new errors and regressions. Microcode bugs have been reported before, therefore longer than usual phasing and monitoring of intel-microcode bugs should be done with extra care.

  [Other]
  caml discussion describing test case to reproduce the crash.
  https://caml.inria.fr/mantis/view.php?id=7452

  =========================================================================

  [Original bug report]

  NB: I am *not* directly affected by this bug.

  Henrique emailed a warning to Debian devel today [1] on a potentially
  serious issue with (sky|kaby)lake processors. Excerpt:

  "This warning advisory is relevant for users of systems with the Intel
  processors code-named "Skylake" and "Kaby Lake".  These are: the 6th and
  7th generation Intel Core processors (desktop, embedded, mobile and
  HEDT), their related server processors (such as Xeon v5 and Xeon v6), as
  well as select Intel Pentium processor models.

  TL;DR: unfixed Skylake and Kaby Lake processors could, in some
  situations, dangerously misbehave when hyper-threading is enabled.
  Disable hyper-threading immediately in BIOS/UEFI to work around the
  problem.  Read this advisory for instructions about an Intel-provided
  fix."

  It is probably a good idea to:
  (1) issue a warning to our users about this;
  (2) update intel-microcode on all our supported releases

  I leave the discussion on whether this can have security implications
  to others.

  [1] https://lists.debian.org/debian-devel/2017/06/msg00308.html

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: intel-microcode 3.20161104.1
  ProcVersionSignature: Ubuntu 4.10.0-24.28-generic 4.10.15
  Uname: Linux 4.10.0-24-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4.1
  Architecture: amd64
  CurrentDesktop: Unity:Unity7
  Date: Sun Jun 25 10:14:19 2017
  InstallationDate: Installed on 2017-05-26 (30 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: intel-microcode
  UpgradeStatus: No upgrade log present (probably fresh install)

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