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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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  Requesting a backport of SMB2/SMB3 bugfix for DFS support

Status in linux package in Ubuntu:

Bug description:
  16.04 x64 with 4.4.0-112 or 4.4.0-116 - cannot traverse a DFS link for
  a cifs.mount from windows if vers is anything other than 1.0 default.
  (This submission was from a 112 host, but it's confirmed to still
  exist on anything less than 4.11.)

  Fix exists in 4.13.x in Ubuntu 18.x and works fine.

  Issue is that once you mount with vers=2 or greater, you cannot
  traverse the dfs root directory to any file server, and you cannot
  mount the dfs path directly - only a direct mount to the backend
  fileservers will work.

  Requesting a backport of the fix as described below as this makes it
  impossible to move forward with security action disabling SMB1 on our
  windows environment. If we do that now, will be unable to use that
  storage from all of our windows systems without directly mapping to
  individual file servers.


  Aurelien Aptel (3):
    CIFS: set SERVER_NAME_LENGTH to serverName actual size
    CIFS: make IPC a regular tcon
    CIFS: use tcon_ipc instead of use_ipc parameter from SMB2_ioctl

  It's unclear if this should be treated as a security issue since it's
  not directly a security problem itself, but rather prevents taking
  security related action.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-generic
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic x86_64
   total 0
   crw-rw---- 1 root audio 116,  1 Feb  8 23:26 seq
   crw-rw---- 1 root audio 116, 33 Feb  8 23:26 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.15
  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: Tue Mar  6 10:29:20 2018
  HibernationDevice: RESUME=/dev/mapper/main-swap
  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
  ProcFB: 0 svgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-112-generic 
root=/dev/mapper/main-root ro
   linux-restricted-modules-4.4.0-112-generic N/A
   linux-backports-modules-4.4.0-112-generic  N/A
   linux-firmware                             1.157.15
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install) 09/21/2015
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 6.00 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:bvnPhoenixTechnologiesLTD:bvr6.00:bd09/21/2015:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A: VMware Virtual Platform
  dmi.product.version: None
  dmi.sys.vendor: VMware, Inc.

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