Summary:

SELinux is preventing /usr/bin/upx from making the program stack executable.

Detailed Description:

The upx 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://www.akkadia.org/drepper/selinux-mem.html) web page explains how to
remove this requirement. If upx 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 upx to run
correctly, you can change the context of the executable to execmem_exec_t.
"chcon -t execmem_exec_t '/usr/bin/upx'" 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/bin/upx'"

Fix Command:

chcon -t execmem_exec_t '/usr/bin/upx'

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                        upx
Source Path                   /usr/bin/upx
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           upx-3.04-2.fc13
Target RPM Packages           
Policy RPM                    selinux-policy-3.9.7-14.fc14
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execstack
Host Name                     (removed)
Platform                      Linux (removed) 2.6.35.6-48.fc14.i686
                              #1 SMP Fri Oct 22 15:34:36 UTC 2010 i686 i686
Alert Count                   1
First Seen                    Sun 05 Dec 2010 03:57:12 PM EST
Last Seen                     Sun 05 Dec 2010 03:57:12 PM EST
Local ID                      53d19d2c-0381-494e-8542-3ff9818b9076
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1291582632.391:171): avc:  denied  { execstack } for  pid=15444 comm="upx" 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(1291582632.391:171): arch=40000003 syscall=125 success=no exit=-13 a0=bf92a000 a1=1000 a2=1000007 a3=bf929e00 items=0 ppid=14864 pid=15444 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=pts0 ses=1 comm="upx" exe="/usr/bin/upx" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  allow_execstack,upx,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;