Bug 537675

Souhrn:

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

Podrobný popis:

[SELinux is in permissive mode. This access was not denied.]

The aticonfig 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 aticonfig 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.

Povolení přístupu:

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

Příkaz pro opravu:

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

Další informace:

Kontext zdroje                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Kontext cíle                 unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Objekty cíle                 None [ process ]
Zdroj                         aticonfig
Cesta zdroje                  /usr/bin/aticonfig
Port                          <Neznámé>
Počítač                    (removed)
RPM balíčky zdroje          
RPM balíčky cíle           
RPM politiky                  selinux-policy-3.6.32-24.fc12
Selinux povolen               True
Typ politiky                  targeted
MLS povoleno                  True
Vynucovací režim            Permissive
Název zásuvného modulu     allow_execstack
Název počítače            (removed)
Platforma                     Linux (removed) 2.6.31.1-56.fc12.i686.PAE #1 SMP Tue
                              Sep 29 16:16:16 EDT 2009 i686 i686
Počet upozornění           1
Poprvé viděno               Ne 15. listopad 2009, 18:21:48 CET
Naposledy viděno             Ne 15. listopad 2009, 18:21:48 CET
Místní ID                   7590f040-31e8-44ef-91db-de37ed9ffb4f
Čísla řádků              

Původní zprávy auditu      

node=(removed) type=AVC msg=audit(1258305708.558:62): avc:  denied  { execstack } for  pid=17427 comm="aticonfig" 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(1258305708.558:62): arch=40000003 syscall=125 success=yes exit=0 a0=bfbd9000 a1=1000 a2=1000007 a3=bfbd91d4 items=0 ppid=17409 pid=17427 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=1 comm="aticonfig" exe="/usr/bin/aticonfig" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.32-24.fc12,allow_execstack,aticonfig,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

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