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Message-Id: <20230522132439.634031-3-aleksandr.mikhalitsyn@canonical.com> Date: Mon, 22 May 2023 15:24:38 +0200 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>, Kuniyuki Iwashima <kuniyu@...zon.com>, Lennart Poettering <mzxreary@...inter.de>, Luca Boccassi <bluca@...ian.org>, Daniel Borkmann <daniel@...earbox.net>, Stanislav Fomichev <sdf@...gle.com>, bpf@...r.kernel.org, linux-arch@...r.kernel.org Subject: [PATCH net-next v6 2/3] net: core: add getsockopt SO_PEERPIDFD 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. 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> Cc: Luca Boccassi <bluca@...ian.org> Cc: Daniel Borkmann <daniel@...earbox.net> Cc: Stanislav Fomichev <sdf@...gle.com> Cc: bpf@...r.kernel.org Cc: linux-kernel@...r.kernel.org Cc: netdev@...r.kernel.org Cc: linux-arch@...r.kernel.org Reviewed-by: Christian Brauner <brauner@...nel.org> Tested-by: Luca Boccassi <bluca@...ian.org> Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com> --- v5: - started using (struct proto)->bpf_bypass_getsockopt hook v4: - return -ESRCH if sk->sk_peer_pid is NULL from getsockopt() syscall - return errors from pidfd_prepare() as it is from getsockopt() syscall v3: - fixed possible fd leak (thanks to Christian Brauner) v2: According to review comments from Kuniyuki Iwashima and Christian Brauner: - use pidfd_create(..) retval as a result - whitespace change --- arch/alpha/include/uapi/asm/socket.h | 1 + arch/mips/include/uapi/asm/socket.h | 1 + arch/parisc/include/uapi/asm/socket.h | 1 + arch/sparc/include/uapi/asm/socket.h | 1 + include/uapi/asm-generic/socket.h | 1 + net/core/sock.c | 33 +++++++++++++++++++++++++ net/unix/af_unix.c | 16 ++++++++++++ tools/include/uapi/asm-generic/socket.h | 1 + 8 files changed, 55 insertions(+) diff --git a/arch/alpha/include/uapi/asm/socket.h b/arch/alpha/include/uapi/asm/socket.h index ff310613ae64..e94f621903fe 100644 --- a/arch/alpha/include/uapi/asm/socket.h +++ b/arch/alpha/include/uapi/asm/socket.h @@ -138,6 +138,7 @@ #define SO_RCVMARK 75 #define SO_PASSPIDFD 76 +#define SO_PEERPIDFD 77 #if !defined(__KERNEL__) diff --git a/arch/mips/include/uapi/asm/socket.h b/arch/mips/include/uapi/asm/socket.h index 762dcb80e4ec..60ebaed28a4c 100644 --- a/arch/mips/include/uapi/asm/socket.h +++ b/arch/mips/include/uapi/asm/socket.h @@ -149,6 +149,7 @@ #define SO_RCVMARK 75 #define SO_PASSPIDFD 76 +#define SO_PEERPIDFD 77 #if !defined(__KERNEL__) diff --git a/arch/parisc/include/uapi/asm/socket.h b/arch/parisc/include/uapi/asm/socket.h index df16a3e16d64..be264c2b1a11 100644 --- a/arch/parisc/include/uapi/asm/socket.h +++ b/arch/parisc/include/uapi/asm/socket.h @@ -130,6 +130,7 @@ #define SO_RCVMARK 0x4049 #define SO_PASSPIDFD 0x404A +#define SO_PEERPIDFD 0x404B #if !defined(__KERNEL__) diff --git a/arch/sparc/include/uapi/asm/socket.h b/arch/sparc/include/uapi/asm/socket.h index 6e2847804fea..682da3714686 100644 --- a/arch/sparc/include/uapi/asm/socket.h +++ b/arch/sparc/include/uapi/asm/socket.h @@ -131,6 +131,7 @@ #define SO_RCVMARK 0x0054 #define SO_PASSPIDFD 0x0055 +#define SO_PEERPIDFD 0x0056 #if !defined(__KERNEL__) diff --git a/include/uapi/asm-generic/socket.h b/include/uapi/asm-generic/socket.h index b76169fdb80b..8ce8a39a1e5f 100644 --- a/include/uapi/asm-generic/socket.h +++ b/include/uapi/asm-generic/socket.h @@ -133,6 +133,7 @@ #define SO_RCVMARK 75 #define SO_PASSPIDFD 76 +#define SO_PEERPIDFD 77 #if !defined(__KERNEL__) diff --git a/net/core/sock.c b/net/core/sock.c index f6c415ef151f..dee8438985dd 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1762,6 +1762,39 @@ int sk_getsockopt(struct sock *sk, int level, int optname, goto lenout; } + case SO_PEERPIDFD: + { + struct pid *peer_pid; + struct file *pidfd_file = NULL; + int pidfd; + + if (len > sizeof(pidfd)) + len = sizeof(pidfd); + + spin_lock(&sk->sk_peer_lock); + peer_pid = get_pid(sk->sk_peer_pid); + spin_unlock(&sk->sk_peer_lock); + + if (!peer_pid) + return -ESRCH; + + pidfd = pidfd_prepare(peer_pid, 0, &pidfd_file); + put_pid(peer_pid); + if (pidfd < 0) + return pidfd; + + if (copy_to_sockptr(optval, &pidfd, len) || + copy_to_sockptr(optlen, &len, sizeof(int))) { + put_unused_fd(pidfd); + fput(pidfd_file); + + return -EFAULT; + } + + fd_install(pidfd, pidfd_file); + return 0; + } + case SO_PEERGROUPS: { const struct cred *cred; diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index aac40106d036..ea24843fb017 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -921,11 +921,26 @@ static void unix_unhash(struct sock *sk) */ } +static bool unix_bpf_bypass_getsockopt(int level, int optname) +{ + if (level == SOL_SOCKET) { + switch (optname) { + case SO_PEERPIDFD: + return true; + default: + return false; + } + } + + return false; +} + struct proto unix_dgram_proto = { .name = "UNIX", .owner = THIS_MODULE, .obj_size = sizeof(struct unix_sock), .close = unix_close, + .bpf_bypass_getsockopt = unix_bpf_bypass_getsockopt, #ifdef CONFIG_BPF_SYSCALL .psock_update_sk_prot = unix_dgram_bpf_update_proto, #endif @@ -937,6 +952,7 @@ struct proto unix_stream_proto = { .obj_size = sizeof(struct unix_sock), .close = unix_close, .unhash = unix_unhash, + .bpf_bypass_getsockopt = unix_bpf_bypass_getsockopt, #ifdef CONFIG_BPF_SYSCALL .psock_update_sk_prot = unix_stream_bpf_update_proto, #endif diff --git a/tools/include/uapi/asm-generic/socket.h b/tools/include/uapi/asm-generic/socket.h index fbbc4bf53ee3..54d9c8bf7c55 100644 --- a/tools/include/uapi/asm-generic/socket.h +++ b/tools/include/uapi/asm-generic/socket.h @@ -122,6 +122,7 @@ #define SO_RCVMARK 75 #define SO_PASSPIDFD 76 +#define SO_PEERPIDFD 77 #if !defined(__KERNEL__) -- 2.34.1
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