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([2a02:8109:bd40:1414:5e7c:880e:420d:8cc7]) by smtp.gmail.com with ESMTPSA id d20-20020a50cd54000000b004fd1ee3f723sm3812336edj.67.2023.03.16.06.16.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Mar 2023 06:16:36 -0700 (PDT) From: Alexander Mikhalitsyn To: davem@davemloft.net Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Alexander Mikhalitsyn , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Leon Romanovsky , David Ahern , Arnd Bergmann , Kees Cook , Christian Brauner Subject: [PATCH net-next 0/3] Add SCM_PIDFD and SO_PEERPIDFD Date: Thu, 16 Mar 2023 14:15:23 +0100 Message-Id: <20230316131526.283569-1-aleksandr.mikhalitsyn@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org 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" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Leon Romanovsky Cc: David Ahern Cc: Arnd Bergmann Cc: Kees Cook Cc: Christian Brauner 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 Tested-by: Luca Boccassi