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Rsdp::search_for_on_bios reads EBDA segment without validation #353

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@martin-hughes

This is a low priority unfixed issue from The Mega Issue (#315)

To quote Isaac:

"We read from the EBDA segment address from the BIOS Data Area without validation. If corrupted or called on a UEFI-only system, bad things could happen. We could potentially add some validation here?"

There's not masses to be done - perhaps even nothing more than adding a Safety: constraint of Don't call on a BIOS system

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