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PS3 Lv0ldr / Bootldr Exploit Reverse-Engineering Details by Naehrwert


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91w ago - Following up on the previous PS3 Lv0ldr / Bootldr clarifications by marcan42 and wololo, today PlayStation 3 hacker naehrwert has shared some details based on reverse-engineering the exploit used to dump it.

To quote from his blog: The Exploit

As the exploit that was used to dump lv0ldr/bootldr/howeveryouliketocallit is public now, let's have a closer look at it to understand what's going on. Here is what I have reversed from lv0 (it shares the syscon portion of the code with its SPU counterpart):

The syscon library implements some high level functions, e.g. to shutdown the console on panic or to read certain configuration values. Every of this functions internally uses another function to exchange packets with syscon and the exchange function uses the read_cmpl_msg one to get the answer packet. The top-level function will pass a fixed size buffer to the exchange function.

So if we are able to control syscon packets, e.g. by emulating MMIO (and thanks to IBM we are), we can change the packet size between the two packet readings and overwrite the caller stack. And if we first copy a little stub to shared LS and let the return address point to it, we can easily dump the whole 256 kB.

Nothing more left to say now, let's wait and see if this is going to be fixed in future firmware versions (we just have to check lv0 fortunately).




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Comments 244 Comments - Go to Forum Thread »

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zhigge's Avatar
#219 - zhigge - 92w ago
can't wait. things are getting interesting.. lets just hope they give up on security being so strict in the new system.. there is room for legal and illegal.

G Sus's Avatar
#218 - G Sus - 93w ago
nah i wouldnt either, hopefully technodon will give it a wirl for us.

i find being in FSM one of the most scarey moments of ps3. only thing that's ever been worse was flashing for cex to dex. and back again .

Blade86's Avatar
#217 - Blade86 - 93w ago
There is even a 4.21 one. But without Hardware-flasher I dont dare to try it...

UrKoS's Avatar
#216 - UrKoS - 93w ago
Wish i had found all this before upgrading to 4.31 grrrr

Sent from my GT-I9100 using Tapatalk 2.

G Sus's Avatar
#215 - G Sus - 93w ago
wouldnt that mean we could use FSM to install cfw and then use the new Lv2diag.self to get out of it, in fw 3.60 and above ?

even if not the cfw, does this give us the possibility of a tool to get out of FSM ? above 3.55

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