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Geohot’s Update PPU,SPU
Geohots has updated his blog an has added some further information to regarding the now famed Geohots PS3 Exploit. He informs us that the SPUs and PPUs can be be utilised by clever maping of memory that can hide or bypass the Hypervisor. He also talk about the cell root key. He adds that it is most likely that it will never be accuired and that indeed it is not needed to Hack the PS3.
Quote from Geohot’s Blog
“Today I verified my theories about running the isolated SPUs as crypto engines. I believe that defeats the last technical argument against the PS3 being hacked.
In OtherOS, all 7 SPUs are idle. You can command an SPU(which I’ll leave as an exercise to the reader) to load metldr, from that load the loader of your choice, and from that decrypt what you choose, everything from pkgs to selfs. Including those from future versions.
The PPU is higher on the control chain then the SPUs. Even if checks were to be added to, for example, verify the hypervisor before decrypting the kernel, with clever memory mappings you can hide your modified hypervisor.
Ah, but you still didn’t get the Cell root key. And I/we never will. But it doesn’t matter. For example, we don’t have either the iPhone or PSP “root key”. But I don’t think anyone doubts the hackedness of those systems.
I wonder if any systems out there are actually secure?”
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