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[Launchpad Bug Tracker <1676635@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.8.0-54.57

---------------
linux (4.8.0-54.57) yakkety; urgency=low

  * linux: 4.8.0-54.57 -proposed tracker (LP: #1692589)

  * CVE-2017-0605
    - tracing: Use strlcpy() instead of strcpy() in __trace_find_cmdline()

  * Populating Hyper-V MSR for Ubuntu 13.10 (LP: #1193172)
    - SAUCE: (no-up) hv: Supply vendor ID and package ABI

  * [Hyper-V] Implement Hyper-V PTP Source (LP: #1676635)
    - hv: allocate synic pages for all present CPUs
    - hv: init percpu_list in hv_synic_alloc()
    - Drivers: hv: vmbus: Prevent sending data on a rescinded channel
    - hv: switch to cpuhp state machine for synic init/cleanup
    - hv: make CPU offlining prevention fine-grained
    - Drivers: hv: vmbus: Fix a rescind handling bug
    - Drivers: hv: util: kvp: Fix a rescind processing issue
    - Drivers: hv: util: Fcopy: Fix a rescind processing issue
    - Drivers: hv: util: Backup: Fix a rescind processing issue
    - Drivers: hv: vmbus: Move the definition of hv_x64_msr_hypercall_contents
    - Drivers: hv: vmbus: Move the definition of generate_guest_id()
    - Revert "UBUNTU: SAUCE: (no-up) hv: Supply vendor ID and package ABI"
    - Drivers: hv vmbus: Move Hypercall page setup out of common code
    - Drivers: hv: vmbus: Move Hypercall invocation code out of common code
    - Drivers: hv: vmbus: Consolidate all Hyper-V specific clocksource code
    - Drivers: hv: vmbus: Move the extracting of Hypervisor version information
    - Drivers: hv: vmbus: Move the crash notification function
    - Drivers: hv: vmbus: Move the check for hypercall page setup
    - Drivers: hv: vmbus: Move the code to signal end of message
    - Drivers: hv: vmbus: Restructure the clockevents code
    - Drivers: hv: util: Use hv_get_current_tick() to get current tick
    - Drivers: hv: vmbus: Get rid of an unsused variable
    - Drivers: hv: vmbus: Define APIs to manipulate the message page
    - Drivers: hv: vmbus: Define APIs to manipulate the event page
    - Drivers: hv: vmbus: Define APIs to manipulate the synthetic interrupt
      controller
    - Drivers: hv: vmbus: Define an API to retrieve virtual processor index
    - Drivers: hv: vmbus: Define an APIs to manage interrupt state
    - Drivers: hv: vmbus: Cleanup hyperv_vmbus.h
    - hv_util: switch to using timespec64
    - Drivers: hv: restore hypervcall page cleanup before kexec
    - Drivers: hv: restore TSC page cleanup before kexec
    - Drivers: hv: balloon: add a fall through comment to hv_memory_notifier()
    - Drivers: hv: vmbus: Use all supported IC versions to negotiate
    - Drivers: hv: Log the negotiated IC versions.
    - Drivers: hv: Fix the bug in generating the guest ID
    - hv: export current Hyper-V clocksource
    - hv_utils: implement Hyper-V PTP source
    - SAUCE: (no-up) hv: Supply vendor ID and package ABI

  * CIFS: Enable encryption for SMB3 (LP: #1670508)
    - SMB3: Add mount parameter to allow user to override max credits
    - SMB2: Separate Kerberos authentication from SMB2_sess_setup
    - SMB2: Separate RawNTLMSSP authentication from SMB2_sess_setup
    - SMB3: parsing for new snapshot timestamp mount parm
    - cifs: Simplify SMB2 and SMB311 dependencies
    - cifs: Only select the required crypto modules
    - cifs: Add soft dependencies
    - CIFS: Separate SMB2 header structure
    - CIFS: Make SendReceive2() takes resp iov
    - CIFS: Make send_cancel take rqst as argument
    - CIFS: Send RFC1001 length in a separate iov
    - CIFS: Separate SMB2 sync header processing
    - CIFS: Separate RFC1001 length processing for SMB2 read
    - CIFS: Add capability to transform requests before sending
    - CIFS: Enable encryption during session setup phase
    - CIFS: Encrypt SMB3 requests before sending
    - CIFS: Add transform header handling callbacks
    - CIFS: Add mid handle callback
    - CIFS: Add copy into pages callback for a read operation
    - CIFS: Decrypt and process small encrypted packets
    - CIFS: Add capability to decrypt big read responses
    - CIFS: Allow to switch on encryption with seal mount option
    - CIFS: Fix possible use after free in demultiplex thread

  * APST quirk needed for Samsung 512GB NVMe drive (LP: #1678184)
    - nvme: Adjust the Samsung APST quirk
    - nvme: Quirk APST off on "THNSF5256GPUK TOSHIBA"

 -- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>  Mon, 22 May
2017 18:56:12 +0200

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-0605

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https://bugs.launchpad.net/bugs/1676635

Title:
  [Hyper-V] Implement Hyper-V PTP Source

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Yakkety:
  Fix Released
Status in linux source package in Zesty:
  Fix Released

Bug description:
  Please include the following upstream commit into lts-xenial, 16.04
  HWE, Yakkity, and Zesty. This will improve the behavior of timesync on
  Hyper-V hosts while simultaneously using network time sync protocols
  like NTP.

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/hv/hv_util.c?id=3716a49a81ba19dda7202633a68b28564ba95eb5

  commit 3716a49a81ba19dda7202633a68b28564ba95eb5
  Author: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
  Date:   Sat Feb 4 09:57:14 2017 -0700

      hv_utils: implement Hyper-V PTP source

      With TimeSync version 4 protocol support we started updating system time
      continuously through the whole lifetime of Hyper-V guests. Every 5 seconds
      there is a time sample from the host which triggers do_settimeofday[64]().
      While the time from the host is very accurate such adjustments may cause
      issues:
      - Time is jumping forward and backward, some applications may misbehave.
      - In case an NTP server runs in parallel and uses something else for time
        sync (network, PTP,...) system time will never converge.
      - Systemd starts annoying you by printing "Time has been changed" every 5
        seconds to the system log.

      Instead of doing in-kernel time adjustments offload the work to an
      NTP client by exposing TimeSync messages as a PTP device. Users may now
      decide what they want to use as a source.

      I tested the solution with chrony, the config was:

       refclock PHC /dev/ptp0 poll 3 dpoll -2 offset 0

      The result I'm seeing is accurate enough, the time delta between the guest
      and the host is almost always within [-10us, +10us], the in-kernel solution
      was giving us comparable results.

      I also tried implementing PPS device instead of PTP by using not currently
      used Hyper-V synthetic timers (we use only one of four for clockevent) but
      with PPS source only chrony wasn't able to give me the required accuracy,
      the delta often more that 100us.

      Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
      Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
      Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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