On Wed, Mar 2, 2022 at 7:03 PM Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx> wrote: > > > > I think current approach is also not safe if cgroup_id gets reused, right? I.e. > it only does cgroup_get_from_id in seq_start, not at attach time, so it may not > be the same cgroup when calling read(2). kernfs is using idr_alloc_cyclic, so it > is less likely to occur, but since it wraps around to find a free ID it might > not be theoretical. cgroupid is 64-bit.
