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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

commit aeaa4a79ff6a5ed912b7362f206cf8576fca538b merged in v4.8-rc1

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

** Also affects: linux (Ubuntu Yakkety)
   Importance: High
     Assignee: Joseph Salisbury (jsalisbury)
       Status: In Progress

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

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भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1612135

Title:
  CIFS client: access problems after updating to kernel 4.4.0-29-generic

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

Bug description:
  SRU Justification

  Impact: A regression in the xenial kernel causes EPERM to be returned
  when accessing dfs subfilesystems in a cifs mount.

  Fix: Upstream cherry pick which uses the appropriate credentials for
  these automounts.

  Regression Potential: The fix involves reverting a sauce patch to fix
  a similar problem in nfs, but it's replace with a more generic fix
  which fixes cifs as well. I have tested with both nfs and cifs
  submounts and confirmed that both work as expected.

  ---

  Expected: being able to mount subfilesystems via cifs mount.
  What happens: permission denied even though there is permission

  I am denied access to the subfilesystems on a samba server. The top
  level filesystem itself is unaffected but dfs links seem to run into
  'Operation not permitted' problems. When accessing the subfilesystem
  on the mount as root it mounts correctly. The standard user is then
  also able to access the subfilesystem.

  This only happens when the client uses kernel 4.4.0-34 (#53). When I
  revert my client to an older kernel (4.4.0-21) everything works. Using
  the older kernel the normal user can directly ls into the
  subfilesystem.

  This is bug is very similar to bug #1603719
  (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1603719).
  However, the released fix (in 4.4.0-33.52) does not seem to fix it for
  cifs.

  Extra info:
  Ubuntu 16.04.1 LTS
  cifs-utils version: 2:6.4-1ubuntu1
  Mount options are minimal: sec=krb5,uid=XXXX,cruid=XXX

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.15
  ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
  Uname: Linux 4.4.0-34-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Thu Aug 11 10:32:20 2016
  InstallationDate: Installed on 2016-04-28 (104 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.update-motd.d.91-release-upgrade: [deleted]

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