[SeaBIOS] Possible security issue or intended functionality?

[k4m1]

Hi,

I noticed, that both bootloader - and kernel code are able to make BIOS ROM section writable again.
This allows hostile code to make modifications to ROM contents, and then run the modified code.

This may allow malicious code to gain privilege escalation from ring0 to ring -2 if I have not
misunderstood this.

Care to verify wheter this is an issue or not?

- k4m1