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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Zesty)
       Status: In Progress => Fix Released

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

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

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https://bugs.launchpad.net/bugs/1729337

Title:
  CIFS errors on 4.4.0-98, but not on 4.4.0-97 with same config

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Fix Released
Status in linux source package in Artful:
  Won't Fix

Bug description:
  == SRU Justification ==
  The bug reporter stated they have a cluster of servers that applied Xenial updates
  and then were unable to mount CIFS shares after upgrading to 4.4.0-98. The
  same machines on 4.4.0-97 do not hit the regression.  It was found that the
  regression is fixed by mainline commit:
  4587eee04e2a ("SMB3: Validate negotiate request must always be signed").

  This fix is required in all Ubuntu supported releases.  Commit 4587eee04e2a
  landed in mailine as of 4.14-rc7.  It  was also cc'd to upstream stable,
  but it has not landed in any stable releases yet, which is the reason for
  this SRU.


  == Fix ==
  commit 4587eee04e2ac7ac3ac9fa2bc164fb6e548f99cd
  Author: Steve French <smfrench@xxxxxxxxx>
  Date:   Wed Oct 25 15:58:31 2017 -0500
      SMB3: Validate negotiate request must always be signed

  == Regression Potential ==
  This patch is to fix a regression.  It was also cc'd to upstream stable, so
  it received addition review upstream.

  We have a cluster of servers that applied a security update overnight
  and were unable to mount CIFS shares after upgrading to 4.4.0-98.  The
  same machines on 4.4.0-97 were fine the night before, and are fine
  after downgrading.  The only error message CIFS would report, even on
  verbose, was:

  [  257.089876] CIFS VFS: validate protocol negotiate failed: -11
  [  257.089964] CIFS VFS: cifs_mount failed w/return code = -5

  Rebooting did not help.  Nor did attempting to mount the share
  manually using mount -t cifs.

  Here's the offending line from our /etc/fstab (with hostnames
  sanitized):

  //server/share /mnt/share cifs rw,user,credentials=/etc/samba/credentials.share,uid=33,gid=33,file_mode=0770,dir_mode=0770
  ,exec,soft,noserverino,vers=3.0 0 0

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-98-generic 4.4.0-98.121
  ProcVersionSignature: Ubuntu 4.4.0-98.121-generic 4.4.90
  Uname: Linux 4.4.0-98-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Nov  1 07:56 seq
   crw-rw---- 1 root audio 116, 33 Nov  1 07:56 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Wed Nov  1 08:49:47 2017
  HibernationDevice: RESUME=/dev/mapper/ubuntu--template--vg-swap_1
  InstallationDate: Installed on 2016-12-16 (319 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  MachineType: VMware, Inc. VMware Virtual Platform
  PciMultimedia:

  ProcFB: 0 svgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-98-generic root=/dev/mapper/ubuntu--template--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-98-generic N/A
   linux-backports-modules-4.4.0-98-generic  N/A
   linux-firmware                            1.157.13
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/21/2015
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 6.00
  dmi.board.name: 440BX Desktop Reference Platform
  dmi.board.vendor: Intel Corporation
  dmi.board.version: None
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd09/21/2015:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
  dmi.product.name: VMware Virtual Platform
  dmi.product.version: None
  dmi.sys.vendor: VMware, Inc.

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