HFS Legacy Volume Name Stack Buffer Overflow

The HFS Legacy Volume Name Stack Buffer Overflow is a kernel vulnerability used to achieve an untethered jailbreak. Its exploit implementation, dubbed "feedface," was used in conjunction with limera1n's bootrom exploit or the usb_control_msg(0xA1, 1) Exploit in greenpois0n.

Credit
jan0, pod2g, Posixninja

Sources for information

 * TwitLonger
 * http://pastie.org/2060071 (from a tweet by jan0)
 * BlackHat Presentation by I0n1c (starting at slide 24)