Bug 540210

Summary:

SELinux is preventing firefox-bin from loading
/usr/lib/firefox-2.0.20/extensions/talkback/components/libqfaservices.so
which requires text relocation.

Detailed Description:

The firefox-bin application attempted to load
/usr/lib/firefox-2.0.20/extensions/talkback/components/libqfaservices.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
/usr/lib/firefox-2.0.20/extensions/talkback/components/libqfaservices.so
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/firefox-2.0.20/extensions/talkback/components/libqfaservices.so
to run correctly, you can change the file context to textrel_shlib_t. "chcon -t
textrel_shlib_t
'/usr/lib/firefox-2.0.20/extensions/talkback/components/libqfaservices.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
'/usr/lib/firefox-2.0.20/extensions/talkback/components/libqfaservices.so'"

Fix Command:

chcon -t textrel_shlib_t
'/usr/lib/firefox-2.0.20/extensions/talkback/components/libqfaservices.so'

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/firefox-2.0.20/extensions/talkback@mozill
                              a.org/components/libqfaservices.so [ file ]
Source                        firefox-bin
Source Path                   /usr/lib/firefox-2.0.20/firefox-bin
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.12-39.fc11
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execmod
Host Name                     (removed)
Platform                      Linux (removed) 2.6.29.4-167.fc11.x86_64
                              #1 SMP Wed May 27 17:27:08 EDT 2009 x86_64 x86_64
Alert Count                   1
First Seen                    Mon 15 Jun 2009 08:24:25 PM CEST
Last Seen                     Mon 15 Jun 2009 08:24:25 PM CEST
Local ID                      a209bae7-0a14-4706-872f-dffa04fc0ea5
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1245090265.136:26978): avc:  denied  { execmod } for  pid=31404 comm="firefox-bin" path="/usr/lib/firefox-2.0.20/extensions/talkback/components/libqfaservices.so" dev=sda6 ino=238395 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(1245090265.136:26978): arch=40000003 syscall=125 success=no exit=-13 a0=838000 a1=4000 a2=5 a3=ffd0f8c0 items=0 ppid=31399 pid=31404 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=pts2 ses=1 comm="firefox-bin" exe="/usr/lib/firefox-2.0.20/firefox-bin" subj=unconfined_u:unconfined_r:unconfined_execmem_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.12-39.fc11,allow_execmod,firefox-bin,unconfined_execmem_t,lib_t,file,execmod
audit2allow suggests:

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