Re: [PATCH bpf-next v1 8/9] bpf: Introduce cgroup iter

[Alexei Starovoitov]

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.