Summary:

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

Detailed Description:

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

Fix Command:

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

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                        ffmpeg
Source Path                   /usr/bin/ffmpeg
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           ffmpeg-0.6-4.20100704svn.fc14
Target RPM Packages           
Policy RPM                    selinux-policy-3.9.7-12.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                    Sat 27 Nov 2010 02:49:24 PM CET
Last Seen                     Sat 27 Nov 2010 02:49:24 PM CET
Local ID                      c5babd35-017f-4f40-9e23-64a417c5271e
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1290865764.217:25988): avc:  denied  { execstack } for  pid=2846 comm="ffmpeg" 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(1290865764.217:25988): arch=40000003 syscall=125 success=no exit=-13 a0=bf88d000 a1=1000 a2=1000007 a3=bf88c6c4 items=0 ppid=2505 pid=2846 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=1 comm="ffmpeg" exe="/usr/bin/ffmpeg" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  allow_execstack,ffmpeg,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;