Bug 558153

Zusammenfassung:

SELinux is preventing /usr/lib/nspluginwrapper/plugin-config from making the
program stack executable.

Detaillierte Beschreibung:

The plugin-config 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 plugin-config 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.

Zugriff erlauben:

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
plugin-config to run correctly, you can change the context of the executable to
execmem_exec_t. "chcon -t execmem_exec_t
'/usr/lib/nspluginwrapper/plugin-config'" 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/lib/nspluginwrapper/plugin-config'"

Fixer Befehl:

chcon -t execmem_exec_t '/usr/lib/nspluginwrapper/plugin-config'

Zusätzliche Informationen:

Quellkontext                  unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Zielkontext                   unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Zielobjekte                   None [ process ]
Quelle                        plugin-config
Quellen-Pfad                  /usr/lib/nspluginwrapper/plugin-config
Port                          <Unbekannt>
Host                          (removed)
Quellen-RPM-Pakete            nspluginwrapper-1.3.0-10.fc12
Ziel-RPM-Pakete               
RPM-Richtlinie                selinux-policy-3.6.32-69.fc12
SELinux aktiviert             True
Richtlinienversion            targeted
Enforcing-Modus               Enforcing
Plugin-Name                   allow_execstack
Hostname                      (removed)
Plattform                     Linux (removed) 2.6.31.5-127.fc12.i686 #1 SMP Sat Nov
                              7 21:41:45 EST 2009 i686 i686
Anzahl der Alarme             2
Zuerst gesehen                So 24 Jan 2010 01:03:22 CET
Zuletzt gesehen               So 24 Jan 2010 01:36:22 CET
Lokale ID                     a2e6eee2-1e99-4458-a156-9fb0bb69c6e8
Zeilennummern                 

Raw-Audit-Meldungen           

node=(removed) type=AVC msg=audit(1264293382.357:27593): avc:  denied  { execstack } for  pid=8304 comm="plugin-config" 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(1264293382.357:27593): arch=40000003 syscall=125 success=no exit=-13 a0=bff6b000 a1=1000 a2=1000007 a3=bff626e0 items=0 ppid=8302 pid=8304 auid=500 uid=500 gid=500 euid=0 suid=0 fsuid=0 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="plugin-config" exe="/usr/lib/nspluginwrapper/plugin-config" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.32-69.fc12,allow_execstack,plugin-config,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;