Quote Originally Posted by Tom_Cat View Post

Dar de ce este usor de modificat XBOX360?

XBOX porneste de la o arhitectura clasica Harvard si este la baza un Power PC de la IBM, avand un procesor Tri-Core la 3.2 Ghz si un chipset grafic de la ATI a carui accesare se realizeaza usor. Sistemul de operare este dezvoltat pe o platforma Windows (puternic modificata pentru a realiza functia de consola) astfel modificarea se face relativ simplu.
De acord dar din cate stiu eu xbox360 s-a modat prin hack-uirea firmware-ului dvd-romului. Deci nu prea a avut a face cu sistemul de operare. Nu? Ma gandesc ca asa ceva se incearca si la PS3. Nu la optic drive dar ceva alternativ la sistem... Poate spun tampenii, nu stiu - dau cu parerea.
Vesti noi vesti noi. Ieri baiatul nostru a postat pe blogul sau ca printre altele lucreaza acum efectiv la cele 2 SPE-uri izolate de securitate si a sistemului de operare: "That aside, I'll tell you what I have so far. I have added two hypercalls, lv1_peek and lv1_poke. peek reads memory in real space(including all the MMIO), poke writes it. I can also add other arbitrary hypercalls as I see fit.

The hypervisor is complicated, it is written in C++ and is PPC, which I am not that familiar with yet. At first I was trying to add a hypercall to add arbitrary real memory to the LPAR, but it kept crashing(because I can't code), which is really annoying, because I have to wait while Linux reboots.

Some people pointed out that I have not accessed the isolated SPEs. This is true. Although as far as doing anything with the system, it doesn't matter. The PPE can't read the isolated data, but it can kick the isolated SPEs out. Decrypt the PPE binary you need using the intact SPE and save the decrypted version. Kick out the SPE, and patch the decrypted version all you want. And interesting note, by the time you get to OtherOS, all 7 working SPEs are stopped.

Despite this, I am working on the isolated SPEs now(which I can now load), because what I'd really like to do is post decryption keys here so you guys can join the fun."