From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 46D1731283B; Fri, 24 Oct 2025 10:58:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761303510; cv=none; b=Ce1tUpZY0AUVoLro9Ja00uF7b+NsbyVSxOxygvffSMgoyBLVL1vbQyeu8lbXBagh1cHfcCeA3061HSO6tt1SotulTPjSjAlDV1fRQwlfbRkV/n2k1F4MgAjYLGOylzOl5jFeFomWc9jgOSLQ3gOoyUpVHm1woEYWudRFFCbedQ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761303510; c=relaxed/simple; bh=0F9mhX2Gl3SVx+//eDdT9Tj87KVi2B6yYobSD3BfDnA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=j+eFVIhaQBf92wZSxZgQAL3NN+/07Zh17IjKrU2i03MEbkQLI7QAs3wvCekIGdJ/TVg+REXNWRbV5AmNc00c0hTwGMxnLz5IIIOiSkM7D8RoyqDO816lAH+jSgXLye/+xJDR6kMZTeE8Tu9fB0mJ8ddWigRVXtRU1CQhxUv/lBU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IEF6+UgI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IEF6+UgI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50F21C4CEFF; Fri, 24 Oct 2025 10:58:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761303509; bh=0F9mhX2Gl3SVx+//eDdT9Tj87KVi2B6yYobSD3BfDnA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=IEF6+UgImUHAMjJgAitaBvd5OziaZdCqrfvP98/19wMazlvfUTqkz6UQU832nMbPh JlyhuZd2tETtISi72czGm9CPTocRiDEZ41LnZEQxIdO3PKghV26q85rFcN+0J6pnza iLqHIU8x76ElFWF61clouBwOk2v6VnHp8QvpBvcm9hUa9dAiP6xLuXGz3lh/mzanOQ OuGXvqVtm8Ttcg8/xDmmoNLhwDjfJBIlv1eyV3/h27vhFWRSqtrdjKlC2U9PpS9RdT ofmYGVdRGrEtEkHW59ZgrBP8kxaeW00Kt1XHcsB9l445vMsaiYIcYdAw6JtSMsqerg OrR6N1hLruk7w== From: Christian Brauner Date: Fri, 24 Oct 2025 12:53:28 +0200 Subject: [PATCH v3 59/70] selftests/namespaces: seventh inactive namespace resurrection test Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251024-work-namespace-nstree-listns-v3-59-b6241981b72b@kernel.org> References: <20251024-work-namespace-nstree-listns-v3-0-b6241981b72b@kernel.org> In-Reply-To: <20251024-work-namespace-nstree-listns-v3-0-b6241981b72b@kernel.org> To: linux-fsdevel@vger.kernel.org, Josef Bacik , Jeff Layton Cc: Jann Horn , Mike Yuan , =?utf-8?q?Zbigniew_J=C4=99drzejewski-Szmek?= , Lennart Poettering , Daan De Meyer , Aleksa Sarai , Amir Goldstein , Tejun Heo , Johannes Weiner , Thomas Gleixner , Alexander Viro , Jan Kara , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, Eric Dumazet , Jakub Kicinski , netdev@vger.kernel.org, Arnd Bergmann , Christian Brauner X-Mailer: b4 0.15-dev-96507 X-Developer-Signature: v=1; a=openpgp-sha256; l=4066; i=brauner@kernel.org; h=from:subject:message-id; bh=0F9mhX2Gl3SVx+//eDdT9Tj87KVi2B6yYobSD3BfDnA=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWT8jmqf5c3O9r02/2cqS1FOCcNOfw/jL8e9Fm631469/ Z23f8fOjlIWBjEuBlkxRRaHdpNwueU8FZuNMjVg5rAygQxh4OIUgIlUqTL8U2fVZtM9lynxfdrX tGXTjgq/ZUnIzpm7qeNM30bTS05BDowM82Md5Kwr8gO1SxmnWDh/msqpZPzMalvQV+0VXeXOk9U YAQ== X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Test socket keeps netns active after creating process exits. Verify that as long as the socket FD exists, the namespace remains active. Signed-off-by: Christian Brauner --- .../testing/selftests/namespaces/siocgskns_test.c | 141 +++++++++++++++++++++ 1 file changed, 141 insertions(+) diff --git a/tools/testing/selftests/namespaces/siocgskns_test.c b/tools/testing/selftests/namespaces/siocgskns_test.c index 231830daf5dc..60028eeecde0 100644 --- a/tools/testing/selftests/namespaces/siocgskns_test.c +++ b/tools/testing/selftests/namespaces/siocgskns_test.c @@ -401,4 +401,145 @@ TEST(siocgskns_multiple_sockets) } } +/* + * Test socket keeps netns active after creating process exits. + * Verify that as long as the socket FD exists, the namespace remains active. + */ +TEST(siocgskns_netns_lifecycle) +{ + int sock_fd, netns_fd; + int ipc_sockets[2]; + int syncpipe[2]; + pid_t pid; + int status; + char sync_byte; + struct stat st; + ino_t netns_ino; + + EXPECT_EQ(socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets), 0); + + ASSERT_EQ(pipe(syncpipe), 0); + + pid = fork(); + ASSERT_GE(pid, 0); + + if (pid == 0) { + /* Child */ + close(ipc_sockets[0]); + close(syncpipe[1]); + + if (unshare(CLONE_NEWNET) < 0) { + close(ipc_sockets[1]); + close(syncpipe[0]); + exit(1); + } + + sock_fd = socket(AF_INET, SOCK_STREAM, 0); + if (sock_fd < 0) { + close(ipc_sockets[1]); + close(syncpipe[0]); + exit(1); + } + + /* Send socket to parent */ + struct msghdr msg = {0}; + struct iovec iov = {0}; + char buf[1] = {'X'}; + char cmsg_buf[CMSG_SPACE(sizeof(int))]; + + iov.iov_base = buf; + iov.iov_len = 1; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = cmsg_buf; + msg.msg_controllen = sizeof(cmsg_buf); + + struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(sizeof(int)); + memcpy(CMSG_DATA(cmsg), &sock_fd, sizeof(int)); + + if (sendmsg(ipc_sockets[1], &msg, 0) < 0) { + close(sock_fd); + close(ipc_sockets[1]); + close(syncpipe[0]); + exit(1); + } + + close(sock_fd); + close(ipc_sockets[1]); + + /* Wait for parent signal */ + read(syncpipe[0], &sync_byte, 1); + close(syncpipe[0]); + exit(0); + } + + /* Parent */ + close(ipc_sockets[1]); + close(syncpipe[0]); + + /* Receive socket FD */ + struct msghdr msg = {0}; + struct iovec iov = {0}; + char buf[1]; + char cmsg_buf[CMSG_SPACE(sizeof(int))]; + + iov.iov_base = buf; + iov.iov_len = 1; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = cmsg_buf; + msg.msg_controllen = sizeof(cmsg_buf); + + ssize_t n = recvmsg(ipc_sockets[0], &msg, 0); + close(ipc_sockets[0]); + ASSERT_EQ(n, 1); + + struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg); + ASSERT_NE(cmsg, NULL); + memcpy(&sock_fd, CMSG_DATA(cmsg), sizeof(int)); + + /* Get netns from socket while child is alive */ + netns_fd = ioctl(sock_fd, SIOCGSKNS); + if (netns_fd < 0) { + sync_byte = 'G'; + write(syncpipe[1], &sync_byte, 1); + close(syncpipe[1]); + close(sock_fd); + waitpid(pid, NULL, 0); + if (errno == ENOTTY || errno == EINVAL) + SKIP(return, "SIOCGSKNS not supported"); + ASSERT_GE(netns_fd, 0); + } + ASSERT_EQ(fstat(netns_fd, &st), 0); + netns_ino = st.st_ino; + + /* Signal child to exit */ + sync_byte = 'G'; + write(syncpipe[1], &sync_byte, 1); + close(syncpipe[1]); + + waitpid(pid, &status, 0); + ASSERT_TRUE(WIFEXITED(status)); + + /* + * Socket FD should still keep namespace active even after + * the creating process exited. + */ + int test_fd = ioctl(sock_fd, SIOCGSKNS); + ASSERT_GE(test_fd, 0); + + struct stat st_test; + ASSERT_EQ(fstat(test_fd, &st_test), 0); + ASSERT_EQ(st_test.st_ino, netns_ino); + + close(test_fd); + close(netns_fd); + + /* Close socket - namespace should become inactive */ + close(sock_fd); +} + TEST_HARNESS_MAIN -- 2.47.3