I didn't think about that idea before actually. I am unsure if it would work, but if it did, then it would be kinda the opposite of Z80 calcs, in the way that instead of running a shell from an OS, you would run the OS from a shell, right?
Exactly.
The thing with modifying the OS directly is that it would be more work for the user to patch it and there would be high risks of bricking their calcs if they use the wrong IPS patch or something. Plus would IPS Patches even work with such file format anyway? And to find an exploit inside the OS itself it will be much more work, not to mention it might end up getting patched by HP if it was the result of a glitch. So your idea could be something worth investigating.
You can't really brick the calc as long as the recovery firmware works afaict.
IPS patches are universal binary patches.
As for the exploit there's none to find. We can freely patch the OS, all we need it to hook a couple functions somewhere and we're all set.
My idea is still much easier to implement and won't require us to update the patches for each new HP OS. As long as we don't mess with exam mode we shouldn't have to fear HP.
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