Bug 540522

Summary:

SELinux is preventing /usr/bin/vlc from loading /usr/lib/libx264.so.68 which
requires text relocation.

Detailed Description:

The vlc application attempted to load /usr/lib/libx264.so.68 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/libx264.so.68 to use relocation as a workaround, until the library is
fixed. Please file a bug report.

Allowing Access:

If you trust /usr/lib/libx264.so.68 to run correctly, you can change the file
context to textrel_shlib_t. "chcon -t textrel_shlib_t '/usr/lib/libx264.so.68'"
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/libx264.so.68'"

Fix Command:

chcon -t textrel_shlib_t '/usr/lib/libx264.so.68'

Additional Information:

Source Context                unconfined_u:unconfined_r:unconfined_execmem_t:s0-
                              s0:c0.c1023
Target Context                system_u:object_r:lib_t:s0
Target Objects                /usr/lib/libx264.so.68 [ file ]
Source                        vlc
Source Path                   /usr/bin/vlc
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           vlc-1.0.3-48.fc12
Target RPM Packages           libx264_68-0.68-10_20090719.2245.fc12
Policy RPM                    selinux-policy-3.6.32-41.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execmod
Host Name                     (removed)
Platform                      Linux (removed) 2.6.31.5-127.fc12.i686 #1 SMP Sat Nov 7
                              21:41:45 EST 2009 i686 i686
Alert Count                   15
First Seen                    Mon 09 Nov 2009 05:16:40 PM EET
Last Seen                     Mon 23 Nov 2009 05:13:05 PM EET
Local ID                      039f781a-c93d-40e9-b294-92dd039ee967
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1258989185.730:224): avc:  denied  { execmod } for  pid=7419 comm="vlc" path="/usr/lib/libx264.so.68" dev=dm-0 ino=85110 scontext=unconfined_u:unconfined_r:unconfined_execmem_t:s0-s0:c0.c1023 tcontext=system_u:object_r:lib_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1258989185.730:224): arch=40000003 syscall=125 success=no exit=-13 a0=72f000 a1=96000 a2=5 a3=bfbfc770 items=0 ppid=1 pid=7419 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=4 comm="vlc" exe="/usr/bin/vlc" subj=unconfined_u:unconfined_r:unconfined_execmem_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.32-41.fc12,allow_execmod,vlc,unconfined_execmem_t,lib_t,file,execmod
audit2allow suggests:

#============= unconfined_execmem_t ==============
allow unconfined_execmem_t lib_t:file execmod;