Just days after its release to developers, Google's Glass headset has already been hacked to give users full control of its Android operating system, according to Jay Freeman, a well-known Android and iOS developer who tested a known exploit for Android on Glass yesterday and announced his success on Twitter Friday afternoon. The 'root' or 'jailbreak' technique Freeman found would potentially remove any restrictions Google might place on Glass, though it's not yet clear exactly what those restrictions might be in consumer versions of the device.

Freeman, who goes by the hacker handle 'Saurik' and created the widely-used app store for jailbroken iOS devices known as Cydia, told me in a phone interview that he discovered yesterday that Glass runs Android 4.0.4, and immediately began testing previously-known exploits that worked on that version of Google's mobile operating system. Within hours, he found that he could use an exploit released by a hacker who goes by the name B1nary last year to gain full control of Glass's operating system.

Google staffer Tim Bray has responded to the jailbreak on Twitter and doesn't seem very concerned. "Yes, Glass is hackable," he writes. "Duh."