I'm in no way an expert in kernel, but I did have a look at the code before running the exploit. Somehow, I had a feeling I will be safe (not least because mine is not a distro kernel), and so eventually I gave it a shot. Indeed, it didn't work. Yes, it was silly and stupid. Curiosity will kill this cat.
But, wow. Looks to me all the rage the guys have meanwhile vented above just waited to happen. I got scared, in a way, coming back to this thread to find 44 responses!