are USB floppies toxic?

[l@odewijk.nl (Lodewijk andré de la porte)]

These fail together, I'd call them equally safe. Using an unusual (and
small) stack is safer as exploits would be more expensive to obtain.

Probably better to airgap by having a secure microkernel (L4, how are you?)
do the USB and another protocol (Ethernet for all I care) carry sanitized
payload to the actual machine. Think of it as wearing a condom. Whatever
the transferred payload is, making sure it's sanitized is vital and
non-trivial. Probably would require interpreting and serializing it again,
to unify the formatting.
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