Bug 539425

Podsumowanie:

SELinux is preventing /usr/bin/kded4 from making the program stack executable.

Szczegółowy opis:

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

The kded4 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 kded4 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 kded4 to
run correctly, you can change the context of the executable to execmem_exec_t.
"chcon -t execmem_exec_t '/usr/bin/kded4'" 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/kded4'"

Polecenie naprawy:

chcon -t execmem_exec_t '/usr/bin/kded4'

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                     plasma-desktop
Ścieżka źródłowa         /usr/bin/plasma-desktop
Port                          <Nieznane>
Komputer                      (removed)
Źródłowe pakiety RPM       kdelibs-4.3.2-4.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               2
Po raz pierwszy               pią, 20 lis 2009, 06:21:04
Po raz ostatni                pią, 20 lis 2009, 06:21:33
Lokalny identyfikator         0b25d656-49a5-4331-aede-e26ea7fba403
Liczba wierszy                

Surowe komunikaty audytu      

node=(removed) type=AVC msg=audit(1258694493.77:16): avc:  denied  { execstack } for  pid=1783 comm="kded4" 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(1258694493.77:16): arch=40000003 syscall=125 success=yes exit=0 a0=bfcce000 a1=1000 a2=1000007 a3=bfccc990 items=0 ppid=1 pid=1783 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="kded4" exe="/usr/bin/kded4" 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,plasma-desktop,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

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