Hackers have revealed a vulnerability in General Motors' OnStar system. Where will it end?

It will never end. The arms race is officially on. The hacks that have occurred were undertaken by benevolent hackers who in some cases have been working with the automakers to refine security, reveal flaws, and develop patches.

But it's possible that more malevolent hackers will enter the game. In fact, they may start out as bad hackers who want to go straight — and see the auto industry as a source of funding. And of course hacking a major automaker's technology is terrific promotion for a hacker or team of hackers ahead of big cybersecurity gatherings, such as the Def Con conference being held now in Las Vegas.