linux-kernel - Re: [PATCH net-next v2 0/3] Add SCM_PIDFD and SO

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Message-ID: <20230322141317.am2j6ml4rvwc5hrx@wittgenstein>
Date:   Wed, 22 Mar 2023 15:13:17 +0100
From:   Christian Brauner <brauner@...nel.org>
To:     Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
Cc:     davem@...emloft.net, 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>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Lennart Poettering <mzxreary@...inter.de>
Subject: Re: [PATCH net-next v2 0/3] Add SCM_PIDFD and SO_PEERPIDFD

On Tue, Mar 21, 2023 at 07:33:39PM +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>
> Cc: Kuniyuki Iwashima <kuniyu@...zon.com>
> Cc: Lennart Poettering <mzxreary@...inter.de>
> 
> Alexander Mikhalitsyn (3):
>   scm: add SO_PASSPIDFD and SCM_PIDFD
>   net: core: add getsockopt SO_PEERPIDFD
>   selftests: net: add SCM_PIDFD / SO_PEERPIDFD test
> 
>  arch/alpha/include/uapi/asm/socket.h          |   3 +
>  arch/mips/include/uapi/asm/socket.h           |   3 +
>  arch/parisc/include/uapi/asm/socket.h         |   3 +
>  arch/sparc/include/uapi/asm/socket.h          |   3 +
>  include/linux/net.h                           |   1 +
>  include/linux/socket.h                        |   1 +
>  include/net/scm.h                             |  14 +-
>  include/uapi/asm-generic/socket.h             |   3 +
>  net/core/sock.c                               |  32 ++
>  net/mptcp/sockopt.c                           |   1 +
>  net/unix/af_unix.c                            |  18 +-
>  tools/include/uapi/asm-generic/socket.h       |   3 +
>  tools/testing/selftests/net/.gitignore        |   1 +
>  tools/testing/selftests/net/af_unix/Makefile  |   3 +-
>  .../testing/selftests/net/af_unix/scm_pidfd.c | 336 ++++++++++++++++++
>  15 files changed, 417 insertions(+), 8 deletions(-)
>  create mode 100644 tools/testing/selftests/net/af_unix/scm_pidfd.c

What's the commit for this work? Because this seems to fail to apply
cleanly on anything from v6.3-rc1 until v6.3-rc3.