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November 20, 2012 // 11:23 pm - 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):

[Register or Login to view code]

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).


PS3 Lv0ldr / Bootldr Exploit Reverse-Engineering Details by Naehrwert

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#205 - JOshISPoser - November 1, 2012 // 8:14 pm
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what's different?

#204 - romhunter - November 1, 2012 // 8:09 pm
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Hi. Some of my WIP and app key files for testing. Bye

#203 - Foo - November 1, 2012 // 7:19 pm
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Yeah the lv2diag files look like legit files but they don't work.

#202 - Gaarasaiyan - November 1, 2012 // 12:00 pm
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I'm just waiting for when I don't have to downgrade to 3.55 to install a CFW. I miss my CFW but I don't want to have to downgrade to install it I just want to be able to install a CFW over the current OFW. Maybe one day...

#201 - mistarz - November 1, 2012 // 9:22 am
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Well.. to be proper and simple. NOTHING.

M

#200 - miki2o - November 1, 2012 // 9:13 am
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What can we do with this PS3 Downgrade 3.60++ (Lv2diag.421.self) ? Thanks I haven't understood the IRC conversation...

#199 - fantopoulos - November 1, 2012 // 7:50 am
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ya it is bananas everywhere people trying to be the grinch of xmas lol enjoy and wait for rebug, or a proper cfw fix cheers

#198 - mistarz - November 1, 2012 // 7:48 am
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Thx Shinji.

M

#197 - shinji1982 - November 1, 2012 // 7:25 am
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What i have read that the Lv2diag.421.self is fake and this is confirmed by eussNL.

#196 - mistarz - November 1, 2012 // 6:53 am
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Hi guys.

This lv2diag.421.self does nothing for me i tried it in several ways... So anyone got some results with it??

M