Bug 542630

Summary:

SELinux is preventing Xorg from loading
/usr/lib/xorg/modules/extensions/libglx.so.195.22 which requires text
relocation.

Detailed Description:

[SELinux is in permissive mode. This access was not denied.]

The Xorg application attempted to load
/usr/lib/xorg/modules/extensions/libglx.so.195.22 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/xorg/modules/extensions/libglx.so.195.22 to use relocation as a
workaround, until the library is fixed. Please file a bug report.

Allowing Access:

If you trust /usr/lib/xorg/modules/extensions/libglx.so.195.22 to run correctly,
you can change the file context to textrel_shlib_t. "chcon -t textrel_shlib_t
'/usr/lib/xorg/modules/extensions/libglx.so.195.22'" 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/xorg/modules/extensions/libglx.so.195.22'"

Fix Command:

chcon -t textrel_shlib_t '/usr/lib/xorg/modules/extensions/libglx.so.195.22'

Additional Information:

Source Context                system_u:system_r:xserver_t:s0-s0:c0.c1023
Target Context                system_u:object_r:lib_t:s0
Target Objects                /usr/lib/xorg/modules/extensions/libglx.so.195.22
                              [ file ]
Source                        Xorg
Source Path                   Xorg
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-46.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Plugin Name                   allow_execmod
Host Name                     (removed)
Platform                      Linux (removed) 2.6.32-rc8 #2 SMP Sun
                              Nov 29 16:05:36 EST 2009 i686 i686
Alert Count                   4
First Seen                    Sun 29 Nov 2009 04:32:55 PM EST
Last Seen                     Mon 30 Nov 2009 07:00:43 AM EST
Local ID                      6807ede7-08c6-41ba-839f-c6640aa400d7
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1259582443.760:29): avc:  denied  { execmod } for  pid=5496 comm="Xorg" path="/usr/lib/xorg/modules/extensions/libglx.so.195.22" dev=dm-0 ino=229963 scontext=system_u:system_r:xserver_t:s0-s0:c0.c1023 tcontext=system_u:object_r:lib_t:s0 tclass=file



Hash String generated from  selinux-policy-3.6.32-46.fc12,allow_execmod,Xorg,xserver_t,lib_t,file,execmod
audit2allow suggests:

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