Your message dated Wed, 30 Apr 2014 15:38:27 +0000
with message-id <[email protected]>
and subject line Bug#746423: fixed in unixodbc 2.3.1-3
has caused the Debian Bug report #746423,
regarding Patch to unixodbc has non-threadsafe use of libltdl
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
(NB: If you are a system administrator and have no idea what this
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--
746423: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746423
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: unixodbc
Version: 2.2.14p2-5
Unixodbc is patched to use libltdl
The following stack trace shows a double free coming from lt_dlsetsearchpath()
when multithread usage of odbc is being done with FreeSWITCH
#0 0x00007f3aed113475 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007f3aed1166f0 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007f3aed14e52b in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007f3aed157d76 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#4 0x00007f3aed15cb1c in free () from /lib/x86_64-linux-gnu/libc.so.6
#5 0x00007f3aeceddc65 in lt_dlsetsearchpath () from
/usr/lib/x86_64-linux-gnu/libltdl.so.7
#6 0x00007f3aeed9c103 in ?? () from /usr/lib/x86_64-linux-gnu/libodbc.so.1
#7 0x00007f3aeed9edfc in SQLConnect () from
/usr/lib/x86_64-linux-gnu/libodbc.so.1
According to the documentation at
http://www.delorie.com/gnu/docs/libtool/libtool_46.html
Note that libltdl is not threadsafe, i.e. a multithreaded application has
to use a mutex for libltdl. It was reported that GNU/Linux's glibc 2.0's
dlopen with `RTLD_LAZY' (which libltdl uses by default) is not thread-safe,
but this problem is supposed to be fixed in glibc 2.1. On the other hand,
`RTLD_NOW' was reported to introduce problems in multi-threaded
applications on FreeBSD. Working around these problems is left as an
exercise for the reader; contributions are certainly welcome.
I think the patch needs to be changed to use this lib with a mutex to avoid
memory corruption when concurrent calls to opening sql drivers are
performed in a multi-threaded app or the use of this libltdl should be
discontinued.
--
Anthony Minessale II ♬ @anthmfs ♬ @FreeSWITCH ♬
☞ http://freeswitch.org/ ☞ http://cluecon.com/ ☞
http://twitter.com/FreeSWITCH
☞ irc.freenode.net #freeswitch ☞ *http://freeswitch.org/g+
<http://freeswitch.org/g+>*
ClueCon Weekly Development Call
☎ sip:[email protected] ☎ +19193869900
--- End Message ---
--- Begin Message ---
Source: unixodbc
Source-Version: 2.3.1-3
We believe that the bug you reported is fixed in the latest version of
unixodbc, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Steve Langasek <[email protected]> (supplier of updated unixodbc package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Format: 1.8
Date: Wed, 30 Apr 2014 00:35:50 +0000
Source: unixodbc
Binary: unixodbc libodbc1 unixodbc-dev odbcinst1debian2 odbcinst
Architecture: source amd64
Version: 2.3.1-3
Distribution: unstable
Urgency: low
Maintainer: Steve Langasek <[email protected]>
Changed-By: Steve Langasek <[email protected]>
Description:
libodbc1 - ODBC library for Unix
odbcinst - Helper program for accessing odbc ini files
odbcinst1debian2 - Support library for accessing odbc ini files
unixodbc - Basic ODBC tools
unixodbc-dev - ODBC libraries for UNIX (development files)
Closes: 746423
Changes:
unixodbc (2.3.1-3) unstable; urgency=low
.
* DriverManager/SQLConnect.c: put a mutex around the call to
lt_dlsetsearchpath(), to avoid double-frees in a multithreaded context.
Closes: #746423.
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Files:
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