Interesting! I had not even realized that this was a problem, though it makes sense now after your description. How realistically feasible is this type of approach, though, given that the manufactures can always just ignore the kernel’s request to reprogram them and continue to access the bus and memory directly?

What exactly does the statement that Linux does not already “embrace the whole hardware” mean?

What’s scary is all of the ways they can track you even without your browser actively cooperating. For example, they can create an HTML5 canvas, render a bunch of shapes, and then probe individual pixels to get a read on your graphics card and drivers. The EFF has a very educational test you can subject your browser to in order to see how easy it is to fingerprint it based on these kinds of things.