Exploiting the iPhone 4 421 by codyd51 | 42 comments on Hacker News. Hi HN, author here! For the past three months, I've been obsessively working on gala, a jailbreak for iOS 4 that currently targets the iPhone 4. While other jailbreaks for this device, and this iOS version, already exist, the 'special sauce' of this jailbreak is that it comes with a 6-part series describing the building of a jailbreak and the many challenges that arose when jailbreaking iOS. The series includes interactive visualizations at every step of exploiting the device - from pulling memory dumps of the boot ROM to debugging a flashed filesystem image. That said, this isn't just a bare-bones jailbreak with some writing attached: gala is a fully-fledged suite that includes a significant Python application, a Cocoa GUI for end-users, a Rust payload, Cocoa Touch games to play within the boot environment while the jailbreak completes, and C utilities that run on-device. This was a lot of fun, and...