Bug 539974

Summary:

SELinux is preventing /home/Abhinav/Downloads/Songbird/songbird-bin from making
the program stack executable.

Detailed Description:

The songbird-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 songbird-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
songbird-bin to run correctly, you can change the context of the executable to
execmem_exec_t. "chcon -t execmem_exec_t
'/home/Abhinav/Downloads/Songbird/songbird-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
'/home/Abhinav/Downloads/Songbird/songbird-bin'"

Fix Command:

chcon -t execmem_exec_t '/home/Abhinav/Downloads/Songbird/songbird-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                        songbird-bin
Source Path                   /home/Abhinav/Downloads/Songbird/songbird-bin
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-24.fc12
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   allow_execstack
Host Name                     (removed)
Platform                      Linux localhost.localdomain
                              2.6.31.1-56.fc12.x86_64 #1 SMP Tue Sep 29 16:16:22
                              EDT 2009 x86_64 x86_64
Alert Count                   21
First Seen                    Tue 17 Nov 2009 05:35:40 PM IST
Last Seen                     Tue 17 Nov 2009 05:41:54 PM IST
Local ID                      b388e9a5-10d9-4e20-b41d-791cb1b6a9e0
Line Numbers                  

Raw Audit Messages            

node=localhost.localdomain type=AVC msg=audit(1258459914.271:113): avc:  denied  { execstack } for  pid=5340 comm="songbird-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=localhost.localdomain type=SYSCALL msg=audit(1258459914.271:113): arch=c000003e syscall=10 success=no exit=-13 a0=7fff54da8000 a1=1000 a2=1000007 a3=3e1c61ab19 items=0 ppid=5152 pid=5340 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=pts0 ses=1 comm="songbird-bin" exe="/home/Abhinav/Downloads/Songbird/songbird-bin" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.32-24.fc12,allow_execstack,songbird-bin,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

#============= unconfined_t ==============
allow unconfined_t self:process execstack;