Bug 467612 - SELinux is preventing operapluginwrap from making the program stack executable.
SELinux is preventing operapluginwrap from making the program stack executable.
Status: CLOSED CANTFIX
Product: Fedora
Classification: Fedora
Component: selinux-policy (Show other bugs)
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All Linux
medium Severity medium
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Assigned To: Daniel Walsh
Fedora Extras Quality Assurance
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2008-10-19 09:07 EDT by Viktor Erdelyi
Modified: 2008-10-20 14:13 EDT (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2008-10-20 14:13:05 EDT
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Description Viktor Erdelyi 2008-10-19 09:07:43 EDT
I get this every time I start Opera (9.60).
If you need additional info, let me know.

Zusammenfassung:

SELinux is preventing operapluginwrap from making the program stack executable.

Detaillierte Beschreibung:

The operapluginwrap 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 operapluginwrap 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
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package.

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
operapluginwrap to run correctly, you can change the context of the executable
to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t
'/usr/lib/opera/9.60/operapluginwrapper'" 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 unconfined_execmem_exec_t
'/usr/lib/opera/9.60/operapluginwrapper'"

Fixer Befehl:

chcon -t unconfined_execmem_exec_t '/usr/lib/opera/9.60/operapluginwrapper'

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                        exaile
Quellen-Pfad                  /usr/bin/python
Port                          <Unbekannt>
Host                          sierravista.nyetwork
Quellen-RPM-Pakete            opera-9.60-2424.gcc4.shared.qt3
Ziel-RPM-Pakete               
RPM-Richtlinie                selinux-policy-3.5.13-1.fc10
SELinux aktiviert             True
Richtlinienversion            targeted
MLS aktiviert                 True
Enforcing-Modus               Enforcing
Plugin-Name                   allow_execstack
Hostname                      sierravista.nyetwork
Plattform                     Linux sierravista.nyetwork
                              2.6.27.2-23.rc1.fc10.i686 #1 SMP Fri Oct 17
                              00:07:31 EDT 2008 i686 i686
Anzahl der Alarme             43
Zuerst gesehen                So 12 Okt 2008 19:34:38 CEST
Zuletzt gesehen               So 19 Okt 2008 15:05:18 CEST
Lokale ID                     6cae6a4b-155e-4814-8f14-f06a8f952cca
Zeilennummern                 

Raw-Audit-Meldungen           

node=sierravista.nyetwork type=AVC msg=audit(1224421518.509:116): avc:  denied  { execstack } for  pid=5342 comm="operapluginwrap" 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=sierravista.nyetwork type=SYSCALL msg=audit(1224421518.509:116): arch=40000003 syscall=125 success=no exit=-13 a0=bfb3a000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=5324 pid=5342 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=3 comm="operapluginwrap" exe="/usr/lib/opera/9.60/operapluginwrapper" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
Comment 1 Daniel Walsh 2008-10-20 09:22:45 EDT
Did you try the suggested fixes in the troubleshoot?  Did you report this bug to Opera?

This link explains what the prolem is.

http://people.redhat.com/~drepper/selinux-mem.html

Did the opera plugin actually work?
Comment 2 Viktor Erdelyi 2008-10-20 13:50:28 EDT
After running the fixer commands, it worked. Before that, no. I reported it to Opera.

Can you actually do something with these AVC denials, or should I report them directly to the author of the program? How can I know whether it is a SELinux bug or an application bug?
Comment 3 Daniel Walsh 2008-10-20 14:13:05 EDT
Reporting them to me is fine.  I will reroute if they are applications bugs.  Tools that require exec(stack, mod, heap, mem) are usually coding problems in how an applciation was built.

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