Bug 549440

Resúmen:

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

Descripción Detallada:

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.

Permitiendo Acceso:

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'"

Comando para Corregir:

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

Información Adicional:

Contexto Fuente               unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Contexto Destino              unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Objetos Destino               None [ process ]
Fuente                        plugin-config
Dirección de Fuente          /usr/lib/nspluginwrapper/plugin-config
Puerto                        <Desconocido>
Nombre de Equipo              (removed)
Paquetes RPM Fuentes          nspluginwrapper-1.3.0-10.fc12
Paquetes RPM Destinos         
RPM de Políticas             selinux-policy-3.6.32-56.fc12
SELinux Activado              True
Tipo de Política             targeted
Modo Obediente                Enforcing
Nombre de Plugin              allow_execstack
Nombre de Equipo              (removed)
Plataforma                    Linux (removed)
                              2.6.31.5-127.fc12.i686 #1 SMP Sat Nov 7 21:41:45
                              EST 2009 i686 athlon
Cantidad de Alertas           1
Visto por Primera Vez         dom 20 dic 2009 22:42:33 CLST
Visto por Última Vez         dom 20 dic 2009 22:42:33 CLST
ID Local                      6124fb05-44b5-481f-b61d-3f6f24fa7737
Números de Línea            

Mensajes de Auditoría Crudos 

node=(removed) type=AVC msg=audit(1261359753.441:37952): avc:  denied  { execstack } for  pid=14033 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(1261359753.441:37952): arch=40000003 syscall=125 success=no exit=-13 a0=bf864000 a1=1000 a2=1000007 a3=bf85c020 items=0 ppid=14031 pid=14033 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 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-3.6.32-56.fc12,allow_execstack,plugin-config,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

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