Theoretical vs. practical cryptography in the kernel

As pointed out in the article, even if you can access and read the whole pool of 128 bits you have to be know exactly when it's inserted in the RNG and time it all perfectly at each step. There's been plenty of news about how the RNG's input data can be determined using various methods (like the RNG data pulled from the network port) but you still have the base problem of knowing exactly when that data is put in the RNG and to what program which RNG bit's go and that just sounds like something that would be nearly impossible.