(UPDATED) Here is a very cool release for the PS3 Hacking community, as developer AlexAltea publishes Full RSX VRAM /IO Access Exploit. While this release is only intended for developer's consumption, it could lead to something more promising down the road for the end user as the developer hope someone can make use of this research and exploit, The capabilities are explained as followed "It just gives you access to something inaccessible before with userland/supervisor privileges". So now developer's can explore new areas on [break]j[/break]the PS3 and nothing better to explore then the RSX chip of the console. Checkout all the details from AlexAltea in the quote below:
Full RSX VRAM/IO access exploit
This allows userland/lv2 access to the entire 256 MB RSX VRAM range and the entire RSX IO address space and works on all firmwares up to the last version. Particularly interesting here, is that this allows to access the last 2 MB of VRAM, reserved only for the LV1 driver, and maybe slightly less interesting, accessing 'vsh.self' VRAM area and IO mapped memory.
Disclaimer The requirements are quite hard to satisfy (many of you either don't need this, or can't run this) and it's only relevant for devs (so some don't need to care about it either). It just gives you access to something inaccessible before with userland/supervisor privileges, nothing else. That's the ONLY reason I'm posting this (and maybe the hope of someone being able to do something better with it).
You need either:
- Userland entry point (e.g. Browser exploit , <= 4.78?) + NAND console (although probably if you have this, you already hacked it and have LV1 access).
- LV2 entry point (e.g. RSXploit , <= 4.45?). You will need to replace the `sys_rsx_context_attribute` LV2 syscall with the `lv1_gpu_device_map` LV1 call in the source code of the PoC provided below (and remove all the GCM library code among other things).
- Source code available here (documentation inlined as comments): https://github.com/AlexAltea/ps3autotests/blob/master/exploits/user_vram_access/user_vram_access.cpp
Thanks a lot to @3141card, for his LV1 RE files, and to people from Nouveau/Envytools people, specially mwk.
-  There's a browser-based (was it Webkit?) memdump PoC for PS3. So, just dump memory, find gadgets and build a ROP chain to load userland code.
-  There's a flaw in 'sys_rsx_context_allocate' that allows that. More info on the RSXploit thread.
See Post # 3 Below for UPDATE
PS3 [PS3] Full RSX VRAM/IO Access Exploit by AlexAltea
By STLcardsWS on Mar 23, 2016 at 9:38 PM
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Let's take a look at the recent update to ZombieBound Reloaded (v0.21 currently) as the homebrew game has seen a lot of improvements in the latest updates. Since the initial release of "Reloaded," we can now buy/unlock new weapons and purchase new levels (w/ in-game currency (gold bars)) from the Store that has now been included. 4 new weapons appear, New Level "The Hospital" has been added, New Zombie Sounds, Improved Fog and Lighting are just some of the new inclusions in v0.20 and 0.21 (which was quickly released to address a shotgun aiming bug,)Continue reading
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