[syslinux] "NOESCAPE 1" is easily escapable

[Alexander Heinz]

> At present the NOESCAPE keyword seems rather useless, because a boot 
> prompt is offered whenever attempts to load a boot image is interrupted 
> using <Ctrl>C.  Intuitively, I would expect "NOESCAPE 1" to lock this 
> down also, and that {sys,pxe,iso.ext}linux would simply fall through to 
> the impicit or explicit ONERROR behaviour.  It doesn't.
> 
> This is particularly a problem for those using the password protection 
> features of menu.c32, because access to a boot prompt will completely 
> subvert this protection.  For example, if I have a standard boot image 
> and a password-protected privileged boot image, I can start booting the 
> standard image, interrupt the boot, and then enter the name of the 
> privileged image to boot it *without entering the password*.

I just want to confirm the problem. I hope that Peter finds the time to 
fix this.

Alex