SELinux, VLC and text relocation
Hi
Summary:
SELinux is preventing vlc from loading
/usr/lib/vlc/codec/librealvideo_plugin.so
which requires text relocation.
Detailed Description:
[SELinux is in permissive mode, the operation would have been denied but was
permitted due to permissive mode.]
The vlc application attempted to load
/usr/lib/vlc/codec/librealvideo_plugin.so
which requires text relocation. This is a potential security problem. Most
libraries do not need this permission. Libraries 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. You can configure SELinux temporarily to allow
/usr/lib/vlc/codec/librealvideo_plugin.so to use relocation as a workaround,
until the library is fixed. Please file a bug report
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package.
Allowing Access:
If you trust /usr/lib/vlc/codec/librealvideo_plugin.so to run correctly,
you can
change the file context to textrel_shlib_t. "chcon -t textrel_shlib_t
'/usr/lib/vlc/codec/librealvideo_plugin.so'" 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 textrel_shlib_t
'/usr/lib/vlc/codec/librealvideo_plugin.so'"
Fix Command:
chcon -t textrel_shlib_t '/usr/lib/vlc/codec/librealvideo_plugin.so'
Additional Information:
Source Context
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
023
Target Context system_u:object_r:lib_t:s0
Target Objects /usr/lib/vlc/codec/librealvideo_plugin.so
[ file ]
Source vlc
Source Path /usr/bin/vlc
Port <Unknown>
Host sundaram
Source RPM Packages vlc-core-0.9.4-1.fc10
Target RPM Packages vlc-core-0.9.4-1.fc10
Policy RPM selinux-policy-3.5.12-3.fc10
Selinux Enabled True
Policy Type targeted
MLS Enabled True
Enforcing Mode Permissive
Plugin Name allow_execmod
Host Name sundaram
Platform Linux sundaram 2.6.27-13.fc10.i686
#1 SMP Wed Oct 15 02:06:26 EDT 2008 i686 i686
Alert Count 1
First Seen Sat 18 Oct 2008 08:18:07 AM IST
Last Seen Sat 18 Oct 2008 08:18:07 AM IST
Local ID 046cbf7a-5c30-4f56-8e3a-01169befcb34
Line Numbers
Raw Audit Messages
node=sundaram type=AVC msg=audit(1224298087.506:271): avc: denied {
execmod } for pid=25126 comm="vlc"
path="/usr/lib/vlc/codec/librealvideo_plugin.so" dev=dm-0 ino=246161
scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tcontext=system_u:object_r:lib_t:s0 tclass=file
node=sundaram type=SYSCALL msg=audit(1224298087.506:271): arch=40000003
syscall=125 success=yes exit=0 a0=7859000 a1=19000 a2=5 a3=bf8a3690
items=0 ppid=1 pid=25126 auid=500 uid=500 gid=500 euid=500 suid=500
fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="vlc"
exe="/usr/bin/vlc"
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
Rahul