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Go Back   Linux Archive > Redhat > Fedora SELinux Support

 
 
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Old 01-03-2008, 06:52 PM
Antonio Olivares
 
Default SELinux is preventing firefox(/usr/lib/firefox-3.0b3pre/firefox)

Summary

SELinux is preventing
firefox(/usr/lib/firefox-3.0b3pre/firefox) from making
the
program stack executable.
Detailed Description

The firefox(/usr/lib/firefox-3.0b3pre/firefox)
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
firefox(/usr/lib/firefox-3.0b3pre/firefox) 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.
Allowing Access

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
firefox(/usr/lib/firefox-3.0b3pre/firefox) to run
correctly, you can change the
context of the executable to
unconfined_execmem_exec_t. "chcon -t
unconfined_execmem_exec_t
firefox(/usr/lib/firefox-3.0b3pre/firefox)" 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
firefox(/usr/lib/firefox-3.0b3pre/firefox)" The
following command will allow this access:
chcon -t unconfined_execmem_exec_t
firefox(/usr/lib/firefox-3.0b3pre/firefox)

Additional Information

Source Context
unconfined_u:unconfined_r:unconfined_t:SystemLow-
SystemHigh
Target Context
unconfined_u:unconfined_r:unconfined_t:SystemLow-
SystemHigh
Target Objects None [ process ]
Source
firefox(/usr/lib/firefox-3.0b3pre/firefox)
Port <Unknown>
Host localhost
Source RPM Packages
Target RPM Packages
Policy RPM
selinux-policy-3.2.5-7.fc9
Selinux Enabled True
Policy Type targeted
MLS Enabled True
Enforcing Mode Enforcing
Plugin Name allow_execstack
Host Name localhost
Platform Linux localhost
2.6.24-0.115.rc5.git5.fc9 #1 SMP
Tue Dec 18 23:57:17 EST
2007 i686 athlon
Alert Count 2
First Seen Thu 03 Jan 2008 01:43:26
PM CST
Last Seen Thu 03 Jan 2008 01:43:26
PM CST
Local ID
34b8cafb-76b2-4a09-9515-0287ddf573b3
Line Numbers

Raw Audit Messages

host=localhost type=AVC msg=audit(1199389406.998:23):
avc: denied { execstack } for pid=2751
comm="firefox"
scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tclass=process

host=localhost type=SYSCALL
msg=audit(1199389406.998:23): arch=40000003
syscall=125 success=no exit=-13 a0=bfa16000 a1=1000
a2=1000007 a3=fffff000 items=0 ppid=1 pid=2751
auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500
egid=500 sgid=500 fsgid=500 tty=(none) comm="firefox"
exe="/usr/lib/firefox-3.0b3pre/firefox"
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
key=(null)



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