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libavformat and SELinux policy issue


When using mplayer for the past few days, I am getting the following SELinux policy issue:



SELinux is preventing totem-video-thu from loading
/usr/lib/sse2/libavformat.so.52.22.1 which requires text relocation.

Detailed Description:

The totem-video-thu application attempted to load
/usr/lib/sse2/libavformat.so.52.22.1 which requires text relocation. This is a
potential security problem. Most libraries do not need this permission.
Libraries are sometimes coded incorrectly and request this permission. The
SELinux Memory Protection Tests
(http://people.redhat.com/drepper/selinux-mem.html) web page explains how to
remove this requirement. You can configure SELinux temporarily to allow
/usr/lib/sse2/libavformat.so.52.22.1 to use relocation as a workaround, until
the library is fixed. Please file a bug report
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package.

Allowing Access:

If you trust /usr/lib/sse2/libavformat.so.52.22.1 to run correctly, you can
change the file context to textrel_shlib_t. "chcon -t textrel_shlib_t
'/usr/lib/sse2/libavformat.so.52.22.1'" You must also change the default file context files on the system in order to preserve them even on a full relabel. "semanage fcontext -a -t textrel_shlib_t '/usr/lib/sse2/libavformat.so.52.22.1'"

Fix Command:

chcon -t textrel_shlib_t '/usr/lib/sse2/libavformat.so.52.22.1'

Additional Information:

Source Context unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
Target Context                system_u:object_r:lib_t:s0
Target Objects                /usr/lib/sse2/libavformat.so.52.22.1 [ file ]
Source                        totem-video-thu
Source Path                   /usr/bin/totem-video-thumbnailer
Port                          <Unknown>
Host                          sundaram.redhat.com
Source RPM Packages           totem-2.24.3-1.fc10
Target RPM Packages           ffmpeg-libs-0.4.9-0.51.20080908.fc10
Policy RPM                    selinux-policy-3.5.13-11.fc10
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   allow_execmod
Host Name                     sundaram.redhat.com
Platform                      Linux sundaram.redhat.com #1 SMP Thu Oct 30 00:49:42
                              EDT 2008 i686 i686
Alert Count                   719
First Seen                    Thu 06 Nov 2008 12:51:21 AM IST
Last Seen                     Thu 06 Nov 2008 01:05:40 AM IST
Local ID                      7e3f9978-5247-4568-9b3b-f14b7db6643c
Line Numbers

Raw Audit Messages

node=sundaram.redhat.com type=AVC msg=audit(1225913740.104:764): avc: denied { execmod } for pid=16396 comm="totem-video-thu" path="/usr/lib/sse2/libavformat.so.52.22.1" dev=dm-0 ino=70735 scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=system_u:object_r:lib_t:s0 tclass=file

node=sundaram.redhat.com type=SYSCALL msg=audit(1225913740.104:764): arch=40000003 syscall=125 success=no exit=-13 a0=15e2000 a1=ac000 a2=5 a3=b735a350 items=0 ppid=2638 pid=16396 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="totem-video-thu" exe="/usr/bin/totem-video-thumbnailer" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



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