Re: [PATCH net-next 1/3] scm: add SO_PASSPIDFD and SCM_PIDFD

[Eric Dumazet]

On Thu, Mar 16, 2023 at 6:16 AM Alexander Mikhalitsyn
<aleksandr.mikhalitsyn@xxxxxxxxxxxxx> wrote:
>
> Implement SCM_PIDFD, a new type of CMSG type analogical to SCM_CREDENTIALS,
> but it contains pidfd instead of plain pid, which allows programmers not
> to care about PID reuse problem.

Hi Alexander

This would add yet another conditional in af_unix fast path.

It seems that we already can use pidfd_open() (since linux-5.3), and
pass the resulting fd in af_unix SCM_RIGHTS message ?

If you think this is not suitable, it should at least be mentioned in
the changelog.

Thanks.