Bug 538545

Podsumowanie:

SELinux is preventing /usr/bin/gmplayer from making the program stack
executable.

Szczegółowy opis:

[SELinux jest w trybie zezwalania. Ten dostęp nie został odmówiony.]

The gmplayer 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 gmplayer 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.

Zezwalanie na dostęp:

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 gmplayer to
run correctly, you can change the context of the executable to execmem_exec_t.
"chcon -t execmem_exec_t '/usr/bin/gmplayer'" 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/gmplayer'"

Polecenie naprawy:

chcon -t execmem_exec_t '/usr/bin/gmplayer'

Dodatkowe informacje:

Kontekst źródłowy          unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Kontekst docelowy             unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Obiekty docelowe              None [ process ]
Źródło                     VBoxTestOGL
Ścieżka źródłowa         /usr/lib/virtualbox/VBoxTestOGL
Port                          <Nieznane>
Komputer                      (removed)
Źródłowe pakiety RPM       mplayer-gui-1.0-0.111.20091029svn.fc12
Docelowe pakiety RPM          
Pakiet RPM polityki           selinux-policy-3.6.32-41.fc12
SELinux jest włączony       True
Typ polityki                  targeted
MLS jest włączone           True
Tryb wymuszania               Permissive
Nazwa wtyczki                 allow_execstack
Nazwa komputera               (removed)
Platforma                     Linux (removed) 2.6.31.5-127.fc12.i686.PAE #1
                              SMP Sat Nov 7 21:25:57 EST 2009 i686 i686
Liczba alarmów               12
Po raz pierwszy               wto, 17 lis 2009, 08:13:51
Po raz ostatni                śro, 18 lis 2009, 15:49:48
Lokalny identyfikator         1afee6fc-36f3-4b90-a4fe-d5d41309f90c
Liczba wierszy                

Surowe komunikaty audytu      

node=(removed) type=AVC msg=audit(1258555788.910:17): avc:  denied  { execstack } for  pid=2333 comm="gmplayer" 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(1258555788.910:17): arch=40000003 syscall=125 success=yes exit=0 a0=bfc92000 a1=1000 a2=1000007 a3=bfc924b8 items=0 ppid=1633 pid=2333 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="gmplayer" exe="/usr/bin/gmplayer" 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,VBoxTestOGL,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

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