Userland

Userland describes the software running on an iDevice after the kernel has started. A userland-based exploit or jailbreak, being entirely software-based, can be patched by Apple. Userland jailbreaks differ from jailbreaks that affect the boot chain of trust, in that they do not allow custom firmwares/IMG3 files to be flashed.

Existing userland jailbreaks include JailbreakMe Star and Saffron. The other userland jailbreaks are Corona, evasi0n, Rocky Racoon and Spirit. The Cydia package for Corona, evasi0n and Rocky Racoon are not userland, however.