Bug 544853

Summary:

SELinux is preventing /usr/bin/Xorg from loading
/opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so which requires text relocation.

Detailed Description:

[Xorg has a permissive type (xserver_t). This access was not denied.]

The Xorg application attempted to load
/opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so 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
/opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so to use relocation as a workaround,
until the library is fixed. Please file a bug report.

Allowing Access:

If you trust /opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so to run correctly, you
can change the file context to textrel_shlib_t. "chcon -t textrel_shlib_t
'/opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so'" 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
'/opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so'"

Fix Command:

chcon -t textrel_shlib_t '/opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so'

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                /opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so [
                              file ]
Source                        Xorg
Source Path                   /usr/bin/Xorg
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           xorg-x11-server-Xorg-1.7.1-7.fc12
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-49.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execmod
Host Name                     (removed)
Platform                      Linux (removed) 2.6.31.6-145.fc12.x86_64 #1 SMP Sat
                              Nov 21 15:57:45 EST 2009 x86_64 x86_64
Alert Count                   3
First Seen                    Wed 02 Dec 2009 14:17:45 CET
Last Seen                     Sun 06 Dec 2009 20:26:39 CET
Local ID                      c4d11cfa-b5bd-4ad1-8c37-c0b8d637ed86
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1260127599.632:6): avc:  denied  { execmod } for  pid=2144 comm="Xorg" path="/opt/VBoxGuestAdditions-3.1.0/lib/VBoxOGL.so" dev=dm-0 ino=144186 scontext=system_u:system_r:xserver_t:s0-s0:c0.c1023 tcontext=system_u:object_r:lib_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1260127599.632:6): arch=c000003e syscall=10 success=yes exit=4194432 a0=7f20970e1000 a1=8b000 a2=5 a3=7f2097122818 items=0 ppid=2138 pid=2144 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=tty7 ses=4294967295 comm="Xorg" exe="/usr/bin/Xorg" subj=system_u:system_r:xserver_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.32-49.fc12,allow_execmod,Xorg,xserver_t,lib_t,file,execmod
audit2allow suggests:

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