Bug 624206 - SELinux is preventing /usr/lib/firefox-4.0/firefox-bin from loading /usr/lib/firefox-4.0/libxul.so which requires text relocation.
Summary: SELinux is preventing /usr/lib/firefox-4.0/firefox-bin from loading /usr/lib/...
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 13
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Daniel Walsh
QA Contact: Fedora Extras Quality Assurance
Whiteboard: setroubleshoot_trace_hash:f906daa7f09...
Depends On:
TreeView+ depends on / blocked
Reported: 2010-08-14 12:16 UTC by dnyanesh
Modified: 2011-10-25 22:17 UTC (History)
6 users (show)

Clone Of:
Last Closed: 2010-08-16 13:08:28 UTC

Attachments (Terms of Use)

Description dnyanesh 2010-08-14 12:16:54 UTC

SELinux is preventing /usr/lib/firefox-4.0/firefox-bin from loading
/usr/lib/firefox-4.0/libxul.so which requires text relocation.

Detailed Description:

The firefox-bin application attempted to load /usr/lib/firefox-4.0/libxul.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-4.0/libxul.so to use relocation as a workaround, until the
library is fixed. Please file a bug report.

Allowing Access:

If you trust /usr/lib/firefox-4.0/libxul.so to run correctly, you can change the
file context to textrel_shlib_t. "chcon -t textrel_shlib_t
'/usr/lib/firefox-4.0/libxul.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-4.0/libxul.so'"

Fix Command:

chcon -t textrel_shlib_t '/usr/lib/firefox-4.0/libxul.so'

Additional Information:

Source Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
Target Context                system_u:object_r:lib_t:s0
Target Objects                /usr/lib/firefox-4.0/libxul.so [ file ]
Source                        firefox-bin
Source Path                   /usr/lib/firefox-4.0/firefox-bin
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           firefox4-4.0-0.2.beta2.fc13.remi
Target RPM Packages           firefox4-4.0-0.2.beta2.fc13.remi
Policy RPM                    selinux-policy-3.7.19-44.fc13
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execmod
Host Name                     (removed)
Platform                      Linux (removed) #1
                              SMP Fri Jul 23 17:21:06 UTC 2010 i686 i686
Alert Count                   3
First Seen                    Thu 12 Aug 2010 10:14:29 PM IST
Last Seen                     Thu 12 Aug 2010 10:15:36 PM IST
Local ID                      13f2f5f9-4ea2-4656-b566-e0505b20f220
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1281631536.111:28344): avc:  denied  { execmod } for  pid=2680 comm="firefox-bin" path="/usr/lib/firefox-4.0/libxul.so" dev=dm-0 ino=1046807 scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=system_u:object_r:lib_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1281631536.111:28344): arch=40000003 syscall=125 success=no exit=-13 a0=f42000 a1=12c6000 a2=5 a3=bfa25560 items=0 ppid=1 pid=2680 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="firefox-bin" exe="/usr/lib/firefox-4.0/firefox-bin" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)

Hash String generated from  allow_execmod,firefox-bin,unconfined_t,lib_t,file,execmod
audit2allow suggests:

#============= unconfined_t ==============
#!!!! This avc can be allowed using the boolean 'allow_execmod'

allow unconfined_t lib_t:file execmod;

Comment 1 Miroslav Grepl 2010-08-16 13:08:28 UTC
/usr/lib/firefox-4.0/libxul.so  is built incorrectly.

Either use the chcon command mentioned in the alert or turn off the check

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