Bug 662609

Zusammenfassung:

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

Detaillierte Beschreibung:

[SELinux ist in freizügigem Modus. Dieser Zugriff wurde nicht verweigert.]

The pidgin 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://www.akkadia.org/drepper/selinux-mem.html) web page explains how to
remove this requirement. If pidgin 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.

Zugriff erlauben:

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

Befehl berichtigen:

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

Zusätzliche Informationen:

Quellkontext                  unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Zielkontext                   unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Zielobjekte                   None [ process ]
Quelle                        ansa_linux_x86_
Quellpfad                     /opt/beta/ansa_v13.1.0/bin/ansa_linux_x86_64
Port                          <Unbekannt>
Host                          (entfernt)
RPM-Pakete der Quelle         pidgin-2.7.7-1.fc14
RPM-Pakete des Ziels          
Richtlinien-RPM               selinux-policy-3.9.7-14.fc14
SELinux aktiviert             True
Richtlinientyp                targeted
Enforcing-Modus               Permissive
Plugin-Name                   allow_execstack
Rechnername                   (entfernt)
Plattform                     Linux (entfernt) 2.6.35.9-64.fc14.x86_64 #1 SMP Fri Dec
                              3 12:19:41 UTC 2010 x86_64 x86_64
Anzahl der Alarme             5
Zuerst gesehen                Di 07 Dez 2010 21:11:34 CET
Zuletzt gesehen               Mo 13 Dez 2010 11:53:41 CET
Lokale ID                     0cd5ba4c-2bc0-4a78-b3d4-33e65c61a033
Zeilennummern                 

Raw-Audit-Meldungen           

node=(entfernt) type=AVC msg=audit(1292237621.954:25922): avc:  denied  { execstack } for  pid=2252 comm="pidgin" 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=(entfernt) type=SYSCALL msg=audit(1292237621.954:25922): arch=c000003e syscall=10 success=yes exit=0 a0=7fffa5528000 a1=1000 a2=1000007 a3=31d0621000 items=0 ppid=2116 pid=2252 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="pidgin" exe="/usr/bin/pidgin" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  allow_execstack,ansa_linux_x86_,unconfined_t,unconfined_t,process,execstack
audit2allow suggests:

#============= unconfined_t ==============
#!!!! This avc can be allowed using the boolean 'allow_execstack'

allow unconfined_t self:process execstack;