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GeoHot PS3 Custom Themes Hack Demonstration Arrives


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233w ago - Today GeoHot has posted a few pictures (below) with the title "Custom Themes?" on the latest PlayStation 3 blog entry, however, no other useful details are available of the PS3 hack demonstration.

To speculate, it appears to illustrate modifying the PS3 GameOS XMB memory areas, but this was already known over a month ago when word first spread of the PS3 Hypervisor lv2 being dumped and reversed.

It's an RCO file edit, just like RCO edits on the PSP (almost same format too). RCO files are resource files for VSH plugins, live in the dev_flash, and aren't signed. To edit them on your system, patch your hypervisor to allow encrypted access to the partition (flash on old systems, hd on new), and mod ps3pf_storage. dev_flash is just a FAT partition, mount it in Linux and change what you'd like.

Nevertheless, it looks like progress is indeed being made editing and replacing an RCO in /dev_flash/vsh/resource/, although it would be nice if the information was made public so that other PS3 Devs in the scene could join in the fun.

From NDT: Le foto sono vere al 100% Ha modificato gli RCO dal dump della ram ma dato che non sono signed questo significa proprio poco. Si vede che stava cercando anche lui qualcosa da postare.

Rough translation: The photos are real 100% Changed the RCO by dump ram but since they have not signed this means just a little. One can see that he was looking for something to post.

Mathieulh: It's real, it has nothing to do with custom backgrounds, what he did was replace a rco file in dev_flash with one he edited (with a custom text in it).

To do that he had to mount dev_flash as rw because it is normally read only. You can do that if you know how to using his exploit under otheros.

As always, more details to come as they are available!





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Comments 42 Comments - Go to Forum Thread »

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Ninjazin's Avatar
#17 - Ninjazin - 233w ago
Great news, the good thing about this thing as I see it is that it is an indication that GeoHot is still in the works. The fact that he does not share his work is a bummer.

Pcsx2006's Avatar
#16 - Pcsx2006 - 233w ago
Great work, i hope his method of dumping lvl2 and lvl2 dumps will leaked soon.

dondolo's Avatar
#15 - dondolo - 233w ago
The fact that George and Matty boy are working alone and not sharing means it's all the more important to update regularly to show he's still interested/working on it. So even though he didn't say anything, it's good to know he's doing something.
yes, in a certain way... the "non sharing" mentality is useless for all the scene.... this guys is one the smartest i ever heard about, but for me is not acting like he could/would have to...

PS3 News's Avatar
#14 - PS3 News - 233w ago
Some more related comments:
geohot
When I posted this, I didn't know the PS3 had real custom themes (what I get for not actually being a user). This is how custom themes worked on the PSP pre firmware 3.70.

knightsolidus
geohot, you can extract the nand via software (linux) or hardware... its for prevent a brick... for not have a brick you first need a backup of the cxd chip (its the real flash) and you can access at that in the test points, that have 18 address points, 16 data points... The cxd chip its 2Gbits and the flash samsung are 2x1Gbits.... understand?

knightsolidus
Hi!!! you now can change a bit on flash for launch the service mode, and now can be installed the firmware debug full... but i think the hardware its different.

Mathieulh
You can't just flash a debug firmware in, flags are checked by the coreos, if you do not have the proper flags set, the firmware wont boot and your ps3 will brick.

So this part of the ram is not signed?

Mathieulh
rcos were used which are vsh resource files. No, rcos are neither signed nor encrypted.

Neo Cyrus's Avatar
#13 - Neo Cyrus - 233w ago
The fact that George and Matty boy are working alone and not sharing means it's all the more important to update regularly to show he's still interested/working on it. So even though he didn't say anything, it's good to know he's doing something.

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