iOS 8.4.1 jailbreak is almost done from the well-known Italian iOS hacker, but the source code is now available.
Via Twitter, Luca Todesco revealed iOS 8.4.1 jailbreak is underway and advised users to install its former firmware as the jailbreak was in the offing for this version. The source code is available on GitHub and is titled "incomplete ios 8.4.1 jailbreak by Kim Jong Cracks (8.4.1 codesign & sandbox bypass w/ LPE to root)".
For iOS 9 users, however, a downgrade to version 8.1.1 is not possible. For those running versions 9.0.2 or 9.0.1 and are planning to return to version 9, it is not possible as well because Apple has terminated the adaptation of the older versions of iOS.
iOS hacker Todesco gave some details for those who are interested in the jailbreak exploit process of downloading DYLD bug as shown on the Ghostbin website. The hacker also gave advanced users the directions on how to successfully perform iOS 8.4.1 jailbreak through a jailbreak tool called toctou.
The installation of toctou is done through this process: if in an ipa file Info.plist is a symlink pointing to /var/mobile/Media/something, you can bypass checks on CFBundleExecutables (akin to evasi0n). This will allow the users to run the binary at anywhere in the FS. Along with the mentioned bug above, it allows for a sandbox escape.
Since iOS 8.4.1 jailbreak tool is a bit complex, experienced users are advised to take on the similar way. Considering that Todesco works in a public form of jailbreak solution, beginners will do well to be ready for this.
iOS 8.4.1 jailbreak is making some people wondering if the release of the public jailbreak tool will be happening soon for iOS 9. Todesco also gave a few hints through a tweet about working on jailbreak for iOS latest version, revealing that the kernel bug for version 9.1 was fixed.