Bug 539226

Resúmen:

SELinux is preventing /usr/bin/liferea (deleted) from making the program stack
executable.

Descripción Detallada:

The liferea 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 liferea 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 liferea to
run correctly, you can change the context of the executable to execmem_exec_t.
"chcon -t execmem_exec_t '/usr/bin/liferea (deleted)'" 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/bin/liferea
(deleted)'"

Comando para Corregir:

chcon -t execmem_exec_t '/usr/bin/liferea (deleted)'

Información Adicional:

Contexto Fuente               unconfined_u:unconfined_r:unconfined_t:s0
Contexto Destino              unconfined_u:unconfined_r:unconfined_t:s0
Objetos Destino               None [ process ]
Fuente                        liferea
Dirección de Fuente          /usr/bin/liferea (deleted)
Puerto                        <Desconocido>
Nombre de Equipo              (removed)
Paquetes RPM Fuentes          
Paquetes RPM Destinos         
RPM de Políticas             selinux-policy-3.6.32-41.fc12
SELinux Activado              True
Tipo de Política             targeted
MLS Activado                  True
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 i686
Cantidad de Alertas           2
Visto por Primera Vez         jue 19 nov 2009 11:07:45 CST
Visto por Última Vez         jue 19 nov 2009 11:07:45 CST
ID Local                      bd216559-896f-46ef-880e-96bfd33702eb
Números de Línea            

Mensajes de Auditoría Crudos 

node=(removed) type=AVC msg=audit(1258650465.583:106): avc:  denied  { execstack } for  pid=12233 comm="liferea" scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:unconfined_r:unconfined_t:s0 tclass=process

node=(removed) type=SYSCALL msg=audit(1258650465.583:106): arch=40000003 syscall=125 success=no exit=-13 a0=bff13000 a1=1000 a2=1000007 a3=bff117a0 items=0 ppid=1 pid=12233 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=2 comm="liferea" exe=2F7573722F62696E2F6C696665726561202864656C6574656429 subj=unconfined_u:unconfined_r:unconfined_t:s0 key=(null)



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

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