Christian Brauner <brauner@xxxxxxxxxx> writes: > pidfd_info overwrites the request_mask with what is supported by the > kernel. I don't think userspace setting random stuff in the request_mask > is a problem. It would already be a problem with statx() and we haven't > seen that so far. > > If userspace happens to set a some random bit in the request_mask and > that bit ends up being used a few kernel releases later to e.g., > retrieve additional information then all that happens is that userspace > would now receive information they didn't need. That's not a problem. That, of course, assumes that there will never be a request_mask bit that affects the information gathering in some other way -- say looking in the parent namespace or such (a random example that just popped into my undercaffeinated brain and is unlikely to be anything we actually do). But then, as I said, I'm bad at this :) jon
