01-26-2010 #11ModderFokker Guest
Indeed.. don't update anything for the coming weeks/months. Perhaps buy yourself another PS3 (phat one of course) new/used.
I'm starting to think about it anyway
Already have 2 Ps3's but one has a broken bluray player.
01-26-2010 #12Pretikewl Guest
Also, the fact it was done on older fw also makes me wonder if this is really any use at all as most people have 3.1+ (if they wanted to do anything online).
Time will tell on this. I'm keeping my fingers crossed this leads to something useful. I want to play .mkv on my ps3 dang it!!
01-26-2010 #13fonzi09 Guest
From the man himself: http://pastie.org/795944
geohot: well actually it's pretty simple
geohot: i allocate a piece of memory
geohot: using map_htab and write_htab, you can figure out the real address of the memory
geohot: which is a big win, and something the hv shouldn't allow
geohot: i fill the htab with tons of entries pointing to that piece of memory
geohot: and since i allocated it, i can map it read/write
geohot: then, i deallocate the memory
geohot: all those entries are set to invalid
geohot: well while it's setting entries invalid, i glitch the memory control bus
geohot: the cache writeback misses the memory
geohot: and i have entries allowing r/w to a piece of memory the hypervisor thinks is deallocated
geohot: then i create a virtual segment with the htab overlapping that piece of memory i have
geohot: write an entry into the virtual segment htab allowing r/w to the main segment htab
geohot: switch to virtual segment
geohot: write to main segment htab a r/w mapping of itself
geohot: switch back
geohot: and would work if memory were encrypted or had ECC
geohot: the way i actually glitch the memory bus is really funny
geohot: i have a button on my FPGA board
geohot: that pulses low for 40ns
geohot: i set up the htab with the tons of entries
geohot: and spam press the button
geohot: right after i send the deallocate call
01-26-2010 #14ultrachez Guest
Looks like this hack can't be implemented easily, if you dont have any "tools".
Figured thats why he needed the digital logic analyzer.
01-26-2010 #15Chivafighter Guest
No Way... he released it... Time for the Devs to beign Investigating lol. Nice going to all the PS3 Devs and Geo Hot for putting much work to hacking the ps3.
01-26-2010 #16Dibblah Guest
Interesting. A guess as to what he's doing is mapping an area of virtual memory which exists above the "target" (the area protected by the HV) and writing to it. The hardware hack is to quickly toggle one of the address pins during this write interval, so instead of writing to the unprotected (allocated by the HV for user-mode access) memory, the write actually goes to the allegedly inaccessible RAM.
This could be patched by Sony very easily for this specific case by just changing the layout of the memory map. However, this does not actually close the hole - Just moves it, so that this specific incarnation of the hack won't work.
01-26-2010 #17ZimZi Guest
.MKV suport is woot i'm hoping for!!!
01-26-2010 #18Raze1988 Guest
01-26-2010 #19xxLindenxx Guest
Please tell me this is true! We need word from Ps3news and CJPC.
01-26-2010 #20Dibblah Guest
The protection that exists on the disk for the PS3 system partition is still unbroken. At this time, the ONLY thing this might affect is allowing better access to some of the hardware from Linux.