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

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Message-Id: <20230316131526.283569-1-aleksandr.mikhalitsyn@canonical.com>
Date:   Thu, 16 Mar 2023 14:15:23 +0100
From:   Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
To:     davem@...emloft.net
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>,
        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>
Subject: [PATCH net-next 0/3] Add SCM_PIDFD and SO_PEERPIDFD

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

 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                             |  16 +-
 include/uapi/asm-generic/socket.h             |   3 +
 net/core/sock.c                               |  35 ++
 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, 423 insertions(+), 7 deletions(-)
 create mode 100644 tools/testing/selftests/net/af_unix/scm_pidfd.c

-- 
2.34.1