Xbox 360 Kernel
Boot-up
TheSpecialist, Xboxhacker.net:
Well from power-on: 1. 1BL (first bootloader, stored in ROM), this loads decrypts and starts: 2. CB (2BL, 2nd bootloader, stored in NAND), this this loads decrypts and starts: 3. CD. This loads, decrypts and decompresses CE, which contains the base kernel + base HV (Hypervisor). It also loads decrypts and then starts: 4. CF. This loads, decrypts and decompresses CG, which contains the patches for kernel and HV. It then applies the patches and starts up the patched HV and then the patched kernel. Then it boots dash. So basically it's like: 1BL -> 2BL -> patch kernel and HV and start them -> boot dashboard. Every step also checks signature for the next step of course.
View Content
To view the content of the dumped NAND flash download the latest version of 360 Flash Dump Tool and open the BIN file.
To decode all of the encrypted content you need the CPU Key located in the fusesets (there are 12) and the 1BL located in the CPU ROM. These are found using the King Kong shader exploit and XeLL (Xeon Linux Loader) on vulnerable firmware version, e.g 4532 and 4548.
Fuses
There are 12 fusesets and they form the fundament for the Xbox 360 hypervisor security [1].
Fuseset #01 - 00: c0ffffffffffffff Fuseset #02 - 01: 0f0f0f0f0f0f0ff0 Fuseset #03 - 02: 0f00000000000000 Fuseset #04 - 03: xxxxxxxxxxxxxxxx Fuseset #05 - 04: xxxxxxxxxxxxxxxx Fuseset #06 - 05: yyyyyyyyyyyyyyyy Fuseset #07 - 06: yyyyyyyyyyyyyyyy Fuseset #08 - 07: 0000000000000000 Fuseset #09 - 08: 0000000000000000 Fuseset #10 - 09: 0000000000000000 Fuseset #11 - 0a: 0000000000000000 Fuseset #12 - 0b: 0000000000000000
1BL
The 1BL is the 'First Boot Loader' and is stored in the ROM inside the CPU. The loader is 32KB and the 1BL key is the same for all Xbox 360 machines.
CPU Key
The CPU Key can be found by combining fusetset #03 + #05 (or #04 + #06). The final string should be 16 bytes long, e.g xxxxxxxxxxxxxxxxyyyyyyyyyyyyyyyy.
XeLL Output
Xe>! XeLL - Xenon linux loader 0.1 * clearing BSS... * Attempting to catch all CPUs... CPUs online: 01.. CPUs online: 15.. * success. trying to initialize network... ok now the NIC NETIF at 8000000001459478 NIC reset reset: 01805508 1478 before: f2050000 1478: f2050000 init tx init rx starting httpd server..ok! * CPU PVR: 00710200 * FUSES - write them down and keep them safe: fuseset 00: c0ffffffffffffff fuseset 01: 0f0f0f0f0f0f0ff0 fuseset 02: 0f00000000000000 fuseset 03: c2666e8fab3c299a fuseset 04: c2666e8fab3c299a fuseset 05: c49a457d64ba4b3d fuseset 06: c49a457d64ba4b3d fuseset 07: f000000000000000 fuseset 08: 0000000000000000 fuseset 09: 0000000000000000 fuseset 10: 0000000000000000 fuseset 11: 0000000000000000
