From kdm any user can reboot/shutdown (at least in my machine) Is this 
an anomaly?

>That wouldn't do what you want. Only root has permission to reboot/halt
>the machine (for obvious reasons). I suppose that if you really wanted
>to do that you could make halt setuid root and make it only executable
>by owner and group, but I really wouldn't recommend that (I avoid making
>anything setuid for security reasons). If you use GDM or KDM for your X
>logins, those can be configured to allow reboot/shutdown from the
>console without a root login.
>
>  
>



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