As we have covered with our report last week, Comex is continuously working on his upcoming iPad 2 Jailbreak, on which he commented that it is "almost ready". Just last week, the famed jailbreak developer had teased on his website JailbreakMe.com on what is assumed to be the iPad 2 jailbreak which is based on a PDF exploit that is accessed through Mobile Safari.
According to Comex's tweet today, the tool that he has been working on will significantly speed up the process of jailbreaking. Comex is utilizing unionfs instead of the old stashing techniques. Here are a couple of tweets by iPhone Dev Team's MuscleNerd that explains the benefits of this particular jailbreak tool of Comex:
[Comex] is (drastically!) reducing the time it takes to install the jailbreak, which normally involves moving lots of Apps around
the initial install (from the time you say "go" to when you can first install something via Cydia) will be much much shorter
it also vastly simplifies the sandboxing problem (Apple apps don't need to be moved, so they retain their entitlements)
see @comex's feed tonight for his huge spoilers :) All devices from iPhone3GS through iPad2, iOS 4.2.1 to 4.3.3
An if you want a detailed explanation about this upcoming jailbreak tool, here's a rather long tweet by Comex:
If you don’t know, the stashing approach jailbreaks have been using for years– Cydia’s "Reorganizing Filesystem"– involves moving some large directories from the small / partition into the large /var partition, then creating symlinks from the original to the new location. This both ensures that any additional stuff put in those directories by packages will end up in the /var partition, and frees up space on the / partition for files created outside of those directories. However, the process has some issues, like taking forever to do when you jailbreak (I am a bit fanatical about speed), pretty much requiring the jailbreak to reboot the system to ensure there aren’t any running applications pointing to the old files (ditto about speed, I want a jailbreak to not even require a respring, as in star, but since star used stashing, some obscure things could cause issues before a reboot), and seriously confusing the sandbox code in the kernel (because each application has a sandbox with a list of allowed filenames, but after the symlink has moved files, the filenames no longer match), requiring that code to be patched (it needs to be patched anyway these days because tweaks have to run under the sandboxes of the applications they’re hooking, but depend on accessing various directories; but it still feels good to get rid of a kludge).
With unionfs (which was saurik’s idea originally), new files are created in the /var partition, and merged with files in the corresponding directories in the / partition, so no files need to be moved, no descriptors are invalidated, and I think the sandbox code won’t notice what happened. It also opens the door for upgrading the base operating system without destroying the jailbreak files (although maybe iOS 5 delta updates will already allow this? I haven’t looked at them yet).
I’ve wanted to do this since literally a year ago (that’s the date of the nullfs checkin, since I was dumb and thought I wanted that instead of unionfs), but I never got around to making it work properly.
So, I just hope that I can get rid of the crashes my meddling with unionfs’s code have introduced, and fix it for the iPad 2 (my dumped copies of iPad 2 kernels do not include symbols; I wrote a small BinDiff-like tool to copy over symbols from a kernel for another device, but it’s not perfect) and that there aren’t any performance issues.
If Comex is able to succeed and somehow iron out the kinks, this looks to become a breakthrough among the jailbreak community. So be sure to stay tune with us for more updates.Contact Us for News Tips, Corrections and Feedback