** Description changed:
+ 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
+ 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]
** Changed in: linux (Ubuntu Xenial)
Status: Incomplete => In Progress
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
In Progress
Status in linux source package in Xenial:
In Progress
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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