[cmccabe]

If we learned anything from ActiveX, it's that "click to continue" is an ineffective defense against malware on the web-- at least for most people.

I don't think it's 100% impossible that there will be a WebGL exploit against some driver or other at some point, but I think the odds have been greatly exaggerated by Microsoft and others. The reality of modern graphics cards is that most of the action happens on the card, not on the host CPU. Combine that with Intel's recent IOMMU technology and you find that exploits usually aren't that interesting. Even if you can get control of the card, you can't do much with it.

Of course, there could be a flaw in the host driver, but it would have to be a really unusual flaw. WebGL itself stops almost all invalid input (and some unsupported valid input) from being sent to the driver, so you'd have to find a perfectly reasonable set of polygons that still triggered an exploit. It would be similar to finding an mp3 that, when played, hacked your sound card driver. It's not impossible, but it's getting into tinfoil hat territory.