Bug 642137

Summary:

SELinux is preventing /usr/lib/nspluginwrapper/npviewer.bin from loading
/opt/google/talkplugin/libnpgoogletalk.so which requires text relocation.

Detailed Description:

The npviewer.bin application attempted to load
/opt/google/talkplugin/libnpgoogletalk.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://www.akkadia.org/drepper/selinux-mem.html) web page explains how to
remove this requirement. You can configure SELinux temporarily to allow
/opt/google/talkplugin/libnpgoogletalk.so to use relocation as a workaround,
until the library is fixed. Please file a bug report.

Allowing Access:

If you trust /opt/google/talkplugin/libnpgoogletalk.so to run correctly, you can
change the file context to textrel_shlib_t. "chcon -t textrel_shlib_t
'/opt/google/talkplugin/libnpgoogletalk.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/google/talkplugin/libnpgoogletalk.so'"

Fix Command:

chcon -t textrel_shlib_t '/opt/google/talkplugin/libnpgoogletalk.so'

Additional Information:

Source Context                unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c102
                              3
Target Context                system_u:object_r:bin_t:s0
Target Objects                /opt/google/talkplugin/libnpgoogletalk.so [ file ]
Source                        npviewer.bin
Source Path                   /usr/lib/nspluginwrapper/npviewer.bin
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           nspluginwrapper-1.3.0-14.fc14
Target RPM Packages           google-talkplugin-1.5.1.0-1
Policy RPM                    selinux-policy-3.9.5-10.fc14
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execmod
Host Name                     (removed)
Platform                      Linux (removed) 2.6.35.4-28.fc14.i686.PAE #1
                              SMP Wed Sep 15 01:57:00 UTC 2010 i686 i686
Alert Count                   10
First Seen                    Mon 11 Oct 2010 03:55:10 PM EEST
Last Seen                     Mon 11 Oct 2010 04:14:15 PM EEST
Local ID                      ae646a34-30d0-44f4-9430-d1385b432b65
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1286802855.424:47): avc:  denied  { execmod } for  pid=9716 comm="npviewer.bin" path="/opt/google/talkplugin/libnpgoogletalk.so" dev=sda5 ino=261679 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=system_u:object_r:bin_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1286802855.424:47): arch=40000003 syscall=125 success=no exit=-13 a0=c68000 a1=27000 a2=5 a3=bfe3e720 items=0 ppid=3332 pid=9716 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="npviewer.bin" exe="/usr/lib/nspluginwrapper/npviewer.bin" subj=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  allow_execmod,npviewer.bin,nsplugin_t,bin_t,file,execmod
audit2allow suggests:

#============= nsplugin_t ==============
allow nsplugin_t bin_t:file execmod;