stack smashing

[Scott Quinn]

Don stated

> And you have to ensure that there is *no* way the user can
>execute code *before* your interpreter/virtual machine/etc.
>gains control of the CPU.  I.e., at the very least, you
>need physical control over the machine.  This isnt possible
>in all cases (e.g., a consumer device!)

You can make it very difficult, though.
The X-box uses cryptographic hashes, the AS/400 uses completely undocumented (in the public sphere)
hardware instructions.