Re: [PATCH net-next v7 1/4] scm: add SO_PASSPIDFD and SCM_PIDFD

[Aleksandr Mikhalitsyn]

On Mon, Jun 12, 2023 at 11:19 AM Eric Dumazet <edumazet@xxxxxxxxxx> wrote:
>
> On Thu, Jun 8, 2023 at 10:26 PM 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.
> >
> > We mask SO_PASSPIDFD feature if CONFIG_UNIX is not builtin because
> > it depends on a pidfd_prepare() API which is not exported to the kernel
> > modules.
> >
> > Idea comes from UAPI kernel group:
> > https://uapi-group.org/kernel-features/
> >
> > Big thanks to Christian Brauner and Lennart Poettering for productive
> > discussions about this.
> >
> > Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> > Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
> > Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
> > Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
> > Cc: Leon Romanovsky <leon@xxxxxxxxxx>
> > Cc: David Ahern <dsahern@xxxxxxxxxx>
> > Cc: Arnd Bergmann <arnd@xxxxxxxx>
> > Cc: Kees Cook <keescook@xxxxxxxxxxxx>
> > Cc: Christian Brauner <brauner@xxxxxxxxxx>
> > Cc: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
> > Cc: Lennart Poettering <mzxreary@xxxxxxxxxxx>
> > Cc: Luca Boccassi <bluca@xxxxxxxxxx>
> > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > Cc: netdev@xxxxxxxxxxxxxxx
> > Cc: linux-arch@xxxxxxxxxxxxxxx
> > Tested-by: Luca Boccassi <bluca@xxxxxxxxxx>
> > Reviewed-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
> > Reviewed-by: Christian Brauner <brauner@xxxxxxxxxx>
> > Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@xxxxxxxxxxxxx>
> > ---
>
> Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>

Thanks, Eric!

Kind regards,
Alex