Bug 548506

Summary:

SELinux is preventing /opt/MatlabR2008b/bin/glnxa64/MATLAB from making the
program stack executable.

Detailed Description:

The MATLAB 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 MATLAB 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 MATLAB to
run correctly, you can change the context of the executable to execmem_exec_t.
"chcon -t execmem_exec_t '/opt/MatlabR2008b/bin/glnxa64/MATLAB'" 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
'/opt/MatlabR2008b/bin/glnxa64/MATLAB'"

Fix Command:

chcon -t execmem_exec_t '/opt/MatlabR2008b/bin/glnxa64/MATLAB'

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                        MATLAB
Source Path                   /opt/MatlabR2008b/bin/glnxa64/MATLAB
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-56.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   allow_execstack
Host Name                     (removed)
Platform                      Linux motoko.oscer.ou.edu 2.6.31.5-127.fc12.x86_64
                              #1 SMP Sat Nov 7 21:11:14 EST 2009 x86_64 x86_64
Alert Count                   1
First Seen                    Thu 17 Dec 2009 10:05:26 AM CST
Last Seen                     Thu 17 Dec 2009 10:05:26 AM CST
Local ID                      f2c439b0-9d7c-4649-abd8-a3eb2abd5715
Line Numbers                  

Raw Audit Messages            

node=motoko.oscer.ou.edu type=AVC msg=audit(1261065926.992:144): avc:  denied  { execstack } for  pid=23502 comm="MATLAB" 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=motoko.oscer.ou.edu type=SYSCALL msg=audit(1261065926.992:144): arch=c000003e syscall=10 success=no exit=-13 a0=7fff28211000 a1=1000 a2=1000007 a3=3334c19aeb items=0 ppid=23480 pid=23502 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=pts5 ses=2 comm="MATLAB" exe="/opt/MatlabR2008b/bin/glnxa64/MATLAB" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)


					
Hash String generated from  selinux-policy-3.6.32-56.fc12,allow_execstack,MATLAB,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

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