netdev - Re: [PATCH net-next 0/3] Add SCM_PIDFD and SO

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Date:   Mon, 20 Mar 2023 14:35:15 +0000
From:   Luca Boccassi <bluca@...ian.org>
To:     Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>,
        davem@...emloft.net
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Leon Romanovsky <leon@...nel.org>,
        David Ahern <dsahern@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Christian Brauner <brauner@...nel.org>, smcv@...labora.com
Subject: Re: [PATCH net-next 0/3] Add SCM_PIDFD and SO_PEERPIDFD

On Thu, 2023-03-16 at 14:15 +0100, Alexander Mikhalitsyn wrote:
> 1. 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.
> 
> 2. Add SO_PEERPIDFD which allows to get pidfd of peer socket holder pidfd.
> This thing is direct analog of SO_PEERCRED which allows to get plain PID.
> 
> 3. Add SCM_PIDFD / SO_PEERPIDFD kselftest
> 
> 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@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: Leon Romanovsky <leon@...nel.org>
> Cc: David Ahern <dsahern@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Christian Brauner <brauner@...nel.org>
> 
> Alexander Mikhalitsyn (3):
>   scm: add SO_PASSPIDFD and SCM_PIDFD
>   net: core: add getsockopt SO_PEERPIDFD
>   selftests: net: add SCM_PIDFD / SO_PEERPIDFD test

I've implemented support for this in dbus-daemon:

https://gitlab.freedesktop.org/dbus/dbus/-/merge_requests/398

It's working very well. I am also working on the dbus-broker and polkit
side of things, will share the links here once they are in a reviewable
state. But the dbus-daemon implementation is enough to meaningfully
test this.

For the series:

Tested-by: Luca Boccassi <bluca@...ian.org>

-- 
Kind regards,
Luca Boccassi

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