Bug 543145

Summary:

SELinux is preventing /home/(removed)/Xilinx_11.1_WebPack_SFD/bin/lin/_xsetup
from making the program stack executable.

Detailed Description:

The _xsetup 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 _xsetup 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 _xsetup to
run correctly, you can change the context of the executable to execmem_exec_t.
"chcon -t execmem_exec_t
'/home/(removed)/Xilinx_11.1_WebPack_SFD/bin/lin/_xsetup'" 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/(removed)/Xilinx_11.1_WebPack_SFD/bin/lin/_xsetup'"

Fix Command:

chcon -t execmem_exec_t '/home/(removed)/Xilinx_11.1_WebPack_SFD/bin/lin/_xsetup'

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                        _xsetup
Source Path                   /home/(removed)/Xilinx_11.1_WebPack_SFD/bin/lin/_xs
                              etup
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-41.fc12
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   allow_execstack
Host Name                     (removed)
Platform                      Linux (removed) 2.6.31.5-127.fc12.i686 #1 SMP Sat
                              Nov 7 21:41:45 EST 2009 i686 i686
Alert Count                   5
First Seen                    Fri 27 Nov 2009 12:42:51 PM EET
Last Seen                     Fri 27 Nov 2009 12:50:28 PM EET
Local ID                      e9a3f179-0c83-4287-99f1-98815e6ad3c9
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1259319028.804:34): avc:  denied  { execstack } for  pid=8982 comm="_xsetup" 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(1259319028.804:34): arch=40000003 syscall=125 success=no exit=-13 a0=bf964000 a1=1000 a2=1000007 a3=bf963bb8 items=0 ppid=8978 pid=8982 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=1 comm="_xsetup" exe="/home/(removed)/Xilinx_11.1_WebPack_SFD/bin/lin/_xsetup" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.32-41.fc12,allow_execstack,_xsetup,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

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