Bug 541837

Resúmen:

SELinux is preventing /home/Guma/Matlab/iso/update/bin/glnx86/xsetup from making
the program stack executable.

Descripción Detallada:

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.

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 xsetup to
run correctly, you can change the context of the executable to execmem_exec_t.
"chcon -t execmem_exec_t '/home/Guma/Matlab/iso/update/bin/glnx86/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/Guma/Matlab/iso/update/bin/glnx86/xsetup'"

Comando para Corregir:

chcon -t execmem_exec_t '/home/Guma/Matlab/iso/update/bin/glnx86/xsetup'

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                        xsetup
Dirección de Fuente          /home/Guma/Matlab/iso/update/bin/glnx86/xsetup
Puerto                        <Desconocido>
Nombre de Equipo              (removed)
Paquetes RPM Fuentes          
Paquetes RPM Destinos         
RPM de Políticas             selinux-policy-3.6.32-46.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 i686
Cantidad de Alertas           1
Visto por Primera Vez         vie 27 nov 2009 03:48:02 PET
Visto por Última Vez         vie 27 nov 2009 03:48:02 PET
ID Local                      0e55d6da-c6ca-4d3c-9dba-eefa718bb138
Números de Línea            

Mensajes de Auditoría Crudos 

node=(removed) type=AVC msg=audit(1259311682.389:16): avc:  denied  { execstack } for  pid=2250 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(1259311682.389:16): arch=40000003 syscall=125 success=no exit=-13 a0=bfcc8000 a1=1000 a2=1000007 a3=bfcc8568 items=0 ppid=2215 pid=2250 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 ses=1 comm="xsetup" exe="/home/Guma/Matlab/iso/update/bin/glnx86/xsetup" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.32-46.fc12,allow_execstack,xsetup,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

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