HBL Running on PS Vita (Half Byte Loader)

Joel16 · Dec 27, 2011

Half Byte Loader running on PS Vita (playing Picodrive Sega emulator ) http://www.youtube.com/watch?v=jxjYiEhwqho&feature=player_embedded

Wololo said:

Update: one important clarification: this video shows HBL running on the latest firmware 1.510. The firmware update that happened today does not patch the exploit, unlike what some sites are saying.

A few days ago Japanese developer Teck4 posted a picture of a â€œhello worldâ€ running on the PS Vita through the PSP emulator. I contacted him immediately with some help from Mamosuke, and I soon got enough information to start working on porting Half Byte Loader to this exploit (note that Teck4 is also working on exploiting this vulnerability further, but I donâ€™t know how far heâ€™s been).

What you see in the video below is the game â€œSonic & Knucklesâ€ running in picodrive, a Megadrive emulator for the PSP.

Yes, Iâ€™m running an emulator inside a hacked emulator on the Vita, thatâ€™s kind of cool. Thereâ€™s lots to say about this ongoing work, but first let me state that, for once, this HBL port is entirely my work, except for the underlying PSP exploit which is initially from Teck4. Iâ€™ve been testing other peopleâ€™s work for a while, so it was about time I got back to coding myself

Now that my ego is satisfied, letâ€™s move on to the details of the video below. I have good news, bad news, and ugly news. But first check the video below, the first usable hack on the PS vita, 10 days after the console is released

1. THE GOOD

This is technically HBL rising from the deads, running on the PS Vita, and loading the picodrive emulator. Usually I would show you the entire loading process, but youâ€™ll understand that some of the things I do (in particular the exploit used) need to be kept under wraps until the whole thing is made public (if it is ever made public, read more below). I hope however that given my reputation on the PSP scene this wonâ€™t be categorized as a fake, please understand that I canâ€™t show much this time. Picodrive is one of the easiest homebrews to run on HBL for some reason, thatâ€™s why Iâ€™m using it in my test. People whoâ€™ve used HBL a lot in its early days will recognize the sound glitch, this is some 22kHz sound being played at 44kHz, or the other way around, I can never remember. Thatâ€™s because the PSP emulator is using PSPâ€™s firmware 6.60, for which HBLâ€™s syscall estimation code seems to be a bit useless. (I am still pending some reply from Teck4 to see if it would make sense to â€œofficiallyâ€ involve more hackers on this port, and see if we can fix those syscalls problems. For now, as far as I know Iâ€™m the only one who made it that far on the Vita, and I feel kind of lonely on this new hacking scene ^^).

Another good piece of news for me is that before HBL could run Homebrews so â€œsmoothlyâ€ on the PSP, it took us several months (I canâ€™t remember exactly, 3 month maybe before we got it running â€œok-ishâ€ ?), while here it took me 3 days to get it to a usable state. Clearly, we didnâ€™t lie when we said HBL would be portable to new game exploits

So, thatâ€™s the good, Iâ€™ve proven to myself that it is possible to run HBL and actual homebrews on the Vita. With little effort, HBL could probably be improved to some extent on that exploit, and run a few useful homebrews.

2. THE BAD

There are slightly bad news too. One is the syscall estimation algorithm being busted, as I explained above. I discussed a bit with JJS, and it is probable that if a function is not imported by the game itself, we might not be able to use it at all. Iâ€™ll have a closer look (if I decide to dig further on this) to see if this can be improved, but that could greatly limit the amount of homebrews that can be played on this.

Another issue is that the time currently needed to load/run homebrews for the â€œend userâ€ is a bit too long to my taste. In its current state, for now I donâ€™t think this is (or will be, even if improved) very useful for the end user. Basically, if I want to run PSP homebrews for now, itâ€™s way easier and cheaper to do so on a PSP, even on an unhacked one, through HBL. So, the overall uselessness of this makes me wonder if it should be kept secret in order for other hackers to do some research on it, or if it should really be released. I wouldnâ€™t like people to point fingers at me if Sony patches some security flaws after this exploit goes publicâ€¦ I wonâ€™t take that decision alone (since Iâ€™m not the only one knowing the exploit), obviously, and thereâ€™s still time until the US/EU release, but Iâ€™m seriously considering the options here.

I have also yet to find a â€œgoodâ€ way to install and run homebrews. I thought I had found a convenient way, but it didnâ€™t work as expected. Iâ€™ll dig more on that, but it seems the PSP filesystem, as seen through the emulator on the vita, is a bit tricky and sneakyâ€¦

THE UGLY

There is, however, far worse than the little concerns above. What concerns me to a great extent is that I realized today that Sony can potentially spy everything we do with the content manager. Today I was forced to update my PS Vita to the new firmware. The content manager refuses to run if its PC client is not connected to the internet, and it refuses to run if the console doesnâ€™t have the latest firmware. This means not only that Sony can force you to update your Vita firmware whenever they feel like it (something they never dared to do on the PSP or the PS3), but also that every time you copy a file from or to your Vita, some information is possibly sent to Sonyâ€™s servers. I half joked about me copying my porn movies to the Vita and Sony knowing about it, but it really concerns me that Sony is spying on the files I have on my hard drive just because I bought one of there gadgets.

Iâ€™m thinking here that the upcoming hacks for the PS Vita will involve lots of legal fights. It seems to me that unless Sony can prove they are not spying on their users, it is potentially illegal to require the tool to be connected while the content manager is running. Something as big as CarrierIQ could happen to them if their customers are willing to take it to court at some point (thatâ€™s an official call to network engineers would would like to analyze whatâ€™s going on when the content manager is connected to the internetâ€¦).

Incidentally, this is also means that Sony could be already aware of the hack and the techniques weâ€™ve been using to trigger it, assuming they take a close look at the interactions between usersâ€™ PC and the Vita.

Anyways, despite these massive concerns, Iâ€™m proud to announce that I got some homebrew to run on the Vita 10 days after its releaseâ€¦ as said before by BlackFire, itâ€™s like â€œposting a sticker on a fortressâ€. Not very useful, but a message to Sony that weâ€™re around
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athemoe · Dec 28, 2011

I don't like "the ugly" part.
Is that even legal?

Joel16 · Dec 28, 2011

im unsure about that, presently it is but not after it is released in the us an eu. im gonna soon create a topic all about ps vita hacks, so you can all whats going on the scene

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HBL Running on PS Vita (Half Byte Loader)

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