ls: cannot open directory /: Permission denied

Code:

$ ls /
ls: cannot open directory /: Permission denied

^^ On a public shell service.

How can someone do that?

chmod 711 / ?

or there's a script or program?

grsecurity didn't done that.

 

bump........

 

Can you log in as root and try again?

 

I don't think you understood what I ask.

Please read it more careful