CIFS client: access problems after updating to kernel 4.4.0-29-generic
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
High
|
Unassigned | ||
Xenial |
Fix Released
|
High
|
Unassigned | ||
Yakkety |
Fix Released
|
High
|
Unassigned |
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:/
Extra info:
Ubuntu 16.04.1 LTS
cifs-utils version: 2:6.4-1ubuntu1
Mount options are minimal: sec=krb5,
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-
ProcVersionSign
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)
PackageArchitec
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: ubuntu-
Symptom: ubuntu-
UpgradeStatus: No upgrade log present (probably fresh install)
modified.
Changed in linux (Ubuntu): | |
assignee: | nobody → Joseph Salisbury (jsalisbury) |
status: | Confirmed → In Progress |
Changed in linux (Ubuntu Xenial): | |
importance: | Undecided → High |
status: | New → In Progress |
assignee: | nobody → Joseph Salisbury (jsalisbury) |
summary: |
- CIFS client: access problems after updating to kernel 4.4.0-3*-generic + CIFS client: access problems after updating to kernel 4.4.0-29-generic |
description: | updated |
Changed in linux (Ubuntu Xenial): | |
status: | Incomplete → In Progress |
Upstream Kernel v 4.4.14-040414 does not have this problem. Latest kernel (4.8-rc1 runs into other problems).