[Pkg-samba-maint] Bug#661487: samba: Setting file attributes when dos filemode=yes and user is not owner of file causes stale lock.

[Fabio Muzzi]

Package: samba
Version: 2:3.5.6~dfsg-3squeeze6
Severity: important
Tags: upstream


This bug seems to be exactly the same as bug 7892 from Samba bugzilla, even if it seems to be resolved in 3.4 and 3.5 at the end of year 2010.

Link to Samba bugzilla: https://bugzilla.samba.org/show_bug.cgi?id=7892

When using "dos filemode=yes", if a user that is not the owner of a file on the samba share (but has the right to change its attributes because of the directive "dos filemode=yes") actually changes attributes to a file, then a stale lock appears on that file, that prevents any modification to that file. This lock remains present until the client that caused it disconnects or the process responsible for it (on the samba server) is killed. Please read the linked bug report on Samba bugzilla for a complete description of the issue.

The stale lock looks like this in smbstatus:

Locked files:
Pid          Uid        DenyMode   Access      R/W        Oplock           SharePath   Name   Time
--------------------------------------------------------------------------------------------------
28376        1000       DENY_NONE  0x82        WRONLY     NONE             /ud0/discone   appunti kiss.txt   Mon Feb 27 14:58:25 2012

I have run the tests in two different environments, with Win XP pro 32 bit and Win 7 home clients, and the bug is 100% reproducible. Servers are both Debian Squeeze 64 bit.




-- System Information:
Debian Release: 6.0.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages samba depends on:
ii  adduser           3.112+nmu2             add and remove users and groups
ii  debconf [debconf- 1.5.36.1               Debian configuration management sy
ii  libacl1           2.2.49-4               Access control list shared library
ii  libattr1          1:2.4.44-2             Extended attribute shared library
ii  libc6             2.11.3-3               Embedded GNU C Library: Shared lib
ii  libcap2           1:2.19-3               support for getting/setting POSIX.
ii  libcomerr2        1.41.12-4stable1       common error description library
ii  libcups2          1.4.4-7+squeeze1       Common UNIX Printing System(tm) - 
ii  libgssapi-krb5-2  1.8.3+dfsg-4squeeze5   MIT Kerberos runtime libraries - k
ii  libk5crypto3      1.8.3+dfsg-4squeeze5   MIT Kerberos runtime libraries - C
ii  libkrb5-3         1.8.3+dfsg-4squeeze5   MIT Kerberos runtime libraries
ii  libldap-2.4-2     2.4.23-7.2             OpenLDAP libraries
ii  libpam-modules    1.1.1-6.1+squeeze1     Pluggable Authentication Modules f
ii  libpam-runtime    1.1.1-6.1+squeeze1     Runtime support for the PAM librar
ii  libpam0g          1.1.1-6.1+squeeze1     Pluggable Authentication Modules l
ii  libpopt0          1.16-1                 lib for parsing cmdline parameters
ii  libtalloc2        2.0.1-1                hierarchical pool based memory all
ii  libwbclient0      2:3.5.6~dfsg-3squeeze6 Samba winbind client library
ii  lsb-base          3.2-23.2squeeze1       Linux Standard Base 3.2 init scrip
ii  procps            1:3.2.8-9              /proc file system utilities
ii  samba-common      2:3.5.6~dfsg-3squeeze6 common files used by both the Samb
ii  update-inetd      4.38+nmu1+squeeze1     inetd configuration file updater
ii  zlib1g            1:1.2.3.4.dfsg-3       compression library - runtime

Versions of packages samba recommends:
ii  logrotate                     3.7.8-6    Log rotation utility

Versions of packages samba suggests:
pn  ctdb                        <none>       (no description available)
pn  ldb-tools                   <none>       (no description available)
ii  openbsd-inetd [inet-superse 0.20080125-6 The OpenBSD Internet Superserver
pn  smbldap-tools               <none>       (no description available)

-- debconf information:
  samba/tdbsam: false
  samba/generate_smbpasswd: true
  samba/run_mode: daemons