SELinux is preventing firefox(/usr/lib/firefox-3.0b3pre/firefox)

[Antonio Olivares]

Summary

SELinux is preventing
firefox(/usr/lib/firefox-3.0b3pre/firefox) from making
the
program stack executable.
Detailed Description

The firefox(/usr/lib/firefox-3.0b3pre/firefox)
application attempted to make its
stack executable. This is a potential security
problem. This should never ever
be necessary. Stack memory is not executable on most
OSes these days and this
will not change. Executable stack memory is one of the
biggest security
problems. An execstack error might in fact be most
likely raised by malicious
code. Applications 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. If
firefox(/usr/lib/firefox-3.0b3pre/firefox) does not
work and you need it to work, you can configure
SELinux temporarily to allow
this access until the application is fixed. Please
file a bug report
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
against this package.
Allowing Access

Sometimes a library is accidentally marked with the
execstack flag, if you find
a library with this flag you can clear it with the
execstack -c LIBRARY_PATH.
Then retry your application. If the app continues to
not work, you can turn the
flag back on with execstack -s LIBRARY_PATH.
Otherwise, if you trust
firefox(/usr/lib/firefox-3.0b3pre/firefox) to run
correctly, you can change the
context of the executable to
unconfined_execmem_exec_t. "chcon -t
unconfined_execmem_exec_t
firefox(/usr/lib/firefox-3.0b3pre/firefox)" 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
unconfined_execmem_exec_t
firefox(/usr/lib/firefox-3.0b3pre/firefox)"    The
following command will allow this access:
    chcon -t unconfined_execmem_exec_t
firefox(/usr/lib/firefox-3.0b3pre/firefox)

Additional Information        

Source Context               
unconfined_u:unconfined_r:unconfined_t:SystemLow-
                              SystemHigh
Target Context               
unconfined_u:unconfined_r:unconfined_t:SystemLow-
                              SystemHigh
Target Objects                None [ process ]
Source                       
firefox(/usr/lib/firefox-3.0b3pre/firefox)
Port                          <Unknown>
Host                          localhost
Source RPM Packages           
Target RPM Packages           
Policy RPM                   
selinux-policy-3.2.5-7.fc9
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   allow_execstack
Host Name                     localhost
Platform                      Linux localhost
2.6.24-0.115.rc5.git5.fc9 #1 SMP
                              Tue Dec 18 23:57:17 EST
2007 i686 athlon
Alert Count                   2
First Seen                    Thu 03 Jan 2008 01:43:26
PM CST
Last Seen                     Thu 03 Jan 2008 01:43:26
PM CST
Local ID                     
34b8cafb-76b2-4a09-9515-0287ddf573b3
Line Numbers                  

Raw Audit Messages            

host=localhost type=AVC msg=audit(1199389406.998:23):
avc:  denied  { execstack } for  pid=2751
comm="firefox"
scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tclass=process

host=localhost type=SYSCALL
msg=audit(1199389406.998:23): arch=40000003
syscall=125 success=no exit=-13 a0=bfa16000 a1=1000
a2=1000007 a3=fffff000 items=0 ppid=1 pid=2751
auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500
egid=500 sgid=500 fsgid=500 tty=(none) comm="firefox"
exe="/usr/lib/firefox-3.0b3pre/firefox"
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
key=(null)



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