how to change the permisson of system/xbin/su
<p>I compiled <code>su</code> to <code>system/xbin</code> but its permissions are <code>-rwsr-x---</code>.  How to change it to <code>-rwsr-x--x</code>?  I have tried to use the commands below in <code>init.rc</code>, but they make no difference.</p>

<p>on boot 
...</p>

<pre><code>chown root system /system/xbin/su
chmod 5751 /system/xbin/su
</code></pre>