Summary:

SELinux is preventing /usr/lib64/thunderbird-3.0/thunderbird-bin from making the
program stack executable.

Detailed Description:

[thunderbird-bin has a permissive type (unconfined_t). This access was not
denied.]

The thunderbird-bin 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 thunderbird-bin 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.

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
thunderbird-bin to run correctly, you can change the context of the executable
to execmem_exec_t. "chcon -t execmem_exec_t
'/usr/lib64/thunderbird-3.0/thunderbird-bin'" 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 execmem_exec_t
'/usr/lib64/thunderbird-3.0/thunderbird-bin'"

Fix Command:

chcon -t execmem_exec_t '/usr/lib64/thunderbird-3.0/thunderbird-bin'

Additional Information:

Source Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Objects                None [ process ]
Source                        thunderbird-bin
Source Path                   /usr/lib64/thunderbird-3.0/thunderbird-bin
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           thunderbird-3.0.1-1.fc13
Target RPM Packages           
Policy RPM                    selinux-policy-3.7.8-2.fc13
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execstack
Host Name                     (removed)
Platform                      Linux (removed)
                              2.6.33-0.20.rc5.git0.fc13.x86_64 #1 SMP Fri Jan 22
                              19:49:17 UTC 2010 x86_64 x86_64
Alert Count                   28
First Seen                    Sat 23 Jan 2010 19:45:41 GMT
Last Seen                     Sat 23 Jan 2010 19:46:47 GMT
Local ID                      a314b194-62d8-4db2-9329-6dd3d5469655
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1264276007.823:66): avc:  denied  { execstack } for  pid=2371 comm="thunderbird-bin" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process

node=(removed) type=SYSCALL msg=audit(1264276007.823:66): arch=c000003e syscall=10 success=yes exit=4294967424 a0=7fffa7ed1000 a1=1000 a2=1000007 a3=3d7e81aab9 items=0 ppid=2367 pid=2371 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="thunderbird-bin" exe="/usr/lib64/thunderbird-3.0/thunderbird-bin" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.7.8-2.fc13,allow_execstack,thunderbird-bin,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

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

allow unconfined_t self:process execstack;