Bug 549675

Description of problem:
SELinux prevents chromium-browser from launching

Version-Release number of selected component (if applicable):
Fedora 12
chromium-browser 4.0.273.0 revision 0.1.20091216svn34775.fc12

How reproducible:
reproducible

Steps to Reproduce:
1. % chromium-browser
  
Actual results:
* the browser window does not appear and the app exits with the following output:
  usr/lib/chromium-browser/chromium-browser: error while loading shared libraries: /usr/lib/chromium-browser/libmedia.so: cannot restore segment prot after reloc: Permission denied
* then SELinux AVC denial alert pops up (see additional info)

Expected results:
The browser should launch

Additional info:

Summary:

SELinux is preventing /usr/lib/chromium-browser/chromium-browser from loading
/usr/lib/chromium-browser/libmedia.so which requires text relocation.

Detailed Description:

The chromium-browse application attempted to load
/usr/lib/chromium-browser/libmedia.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/chromium-browser/libmedia.so to use relocation as a workaround, until
the library is fixed. Please file a bug report.

Allowing Access:

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

Fix Command:

chcon -t textrel_shlib_t '/usr/lib/chromium-browser/libmedia.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/chromium-browser/libmedia.so [ file ]
Source                        chromium-browse
Source Path                   /usr/lib/chromium-browser/chromium-browser
Port                          <Unknown>
Host                          <Removed>
Source RPM Packages           chromium-4.0.273.0-0.1.20091216svn34775.fc12
Target RPM Packages           chromium-libs-4.0.273.0-0.1.20091216svn34775.fc12
Policy RPM                    selinux-policy-3.6.32-56.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execmod
Host Name                     <Removed>
Plateform                     Linux <Removed> 2.6.31.6-166.fc12.i686 #1 SMP Wed
                              Dec 9 11:14:59 EST 2009 i686 i686
Alert Count                   12
First Seen                    Tue 22 Dec 2009 10:57:21 CET
Last Seen                     Tue 22 Dec 2009 11:47:04 CET
Local ID                      48ee7c03-3907-48bd-a594-bb2366b0deeb
Line Numbers           

Raw Audit Messages         

node=<Removed> type=AVC msg=audit(1261478824.27:24584): avc:  denied  { execmod } for  pid=3151 comm="chromium-browse" path="/usr/lib/chromium-browser/libmedia.so" dev=dm-0 ino=124450 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(1261478824.27:24584): arch=40000003 syscall=125 success=no exit=-13 a0=1b19000 a1=63000 a2=5 a3=bfc53920 items=0 ppid=2246 pid=3151 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=pts0 ses=1 comm="chromium-browse" exe="/usr/lib/chromium-browser/chromium-browser" subj=unconfined_u:unconfined_r:unconfined_execmem_t:s0-s0:c0.c1023 key=(null)