0004300: CIFS mount allows remote Windows server to move/remove files during write

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Category

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Date Submitted

Last Update

0004300

CentOS-5

kernel

public

2010-05-05 16:32

2010-05-05 16:53

Reporter

stvnfnly

Priority

normal

Severity

major

Reproducibility

always

Status

new

Resolution

open

Platform

OS Version

Product Version

5.4

Target Version

Fixed in Version

Summary

0004300: CIFS mount allows remote Windows server to move/remove files during write

Description

While copying a file across a cifs mount the remote server can move/remove the file.

-------------------------------
Machine 1:

# cat /etc/issue
CentOS release 5.4 (Final)
Kernel \r on an \m

# uname -a
Linux machine1 2.6.18-164.6.1.el5 0000001 SMP Tue Nov 3 16:12:36 EST 2009 x86_64 x86_64 x86_64 GNU/Linux

# rpm -qa |grep samba
samba-common-3.0.33-3.14.el5
samba-client-3.0.33-3.14.el5

This machine can properly mount rw to a remote Windows Server 2008 R2 share and copy/remove/change perms, etc any file. However an automated application on the remote server can remove/move a file during a copy, and any permission/ownership option fails with a "file not available" error.

-------------------------------
Machine 2

# cat /etc/issue
Red Hat Enterprise Linux WS release 4 (Nahant Update 8)
Kernel \r on an \m

# uname -a
Linux machine2 2.6.9-89.0.23.ELsmp 0000001 SMP Fri Mar 5 17:56:21 EST 2010 i686 i686 i386 GNU/Linux

# rpm -qa |grep samba
samba-common-3.0.33-0.18.el4_8.1
samba-client-3.0.33-0.18.el4_8.1

This machine can properly mount rw to the same remote Windows Server 2008 R2 share and copy/remove/etc files. However, an application on that same remote server can not remove/move a file during a copy, and the copy and any permission/ownership options work 100% of the time.

-----------------------------------
I cannot easily tell if this issue is with samba-client or with the cifs.ko kernel module. But since the EL4 box always works, I suspect cifs.ko which is part of the kernel RPM.

# rpm -qf /lib/modules/2.6.18-164.6.1.el5/kernel/fs/cifs/cifs.ko
kernel-2.6.18-164.6.1.el5

Issue History
Date Modified	Username	Field	Change
2010-05-05 16:32	stvnfnly	New Issue
2010-05-05 16:53	toracat	Note Added: 0011217

Notes
(0011217) toracat (developer) 2010-05-05 16:53	If you suspect that cifs.ko is involved, the best strategy would be to take this up with upstream (samba developers). I suggest this samba mailing list: https://lists.samba.org/mailman/listinfo/linux-cifs-client [^] . Jeff Layton of Red Hat has been quite actively working on the development of cifs.

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