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 F2689346E41; Wed, 29 Oct 2025 12:22:40 +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=1761740561; cv=none; b=FwZE+WWvwEM8iXP5/D9VuIStRzGNALQrgw/Dckdqqr1yfval9KkbD2eGOTcRWmL6uJNxnDXgHPYERaLVfpCHzoXRstXfi151IBJ9dFk7SEoXDOVUr/VwpwDp0Uw1++VGQmgJBg8jhurcsrYo4886pb2vfWbHGzJ5jFpMEz3CSfc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761740561; c=relaxed/simple; bh=VPZa5Pr6JMy6E6vudTcQn3gJk3UQIlVxfxrLDEyUgG4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Mu8OP18UW13qgXMcTPjRe6QFKxr6wqAzZBNgtOTtmMB3Yhz1u54HfNidBGCfMyBb/2/49gsUHWdLmYwQ6CLHnZm1ej/Lh86LE+ibiDB6NQy8Yh9/fHAbPz5PqSZLYoCs3bq5c7xgBA3Or4p9/W3MDjj8NFmfQsaT3yV8FKqBFmI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QnDRftP+; 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="QnDRftP+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EB566C4CEF7; Wed, 29 Oct 2025 12:22:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761740560; bh=VPZa5Pr6JMy6E6vudTcQn3gJk3UQIlVxfxrLDEyUgG4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=QnDRftP+/72UgrstFsgXBNah7BFFUeC+Y9KZSTnzzYL602mk+D1G4MUQtbmI+1FFa uhRM+SXY5Aczu/9Ko73zIQHm9/v+JZissHn/CHnSjpwAwlz+hCX5tqZLclTslpT8LB 5drpEi09q1c3TnH8PtxzxQ4vWMlkD8hTwFGTHOYdSoEyQ8b+RFpUBqchmdk1qSPDeY nXwAp7rpIW0FjmB+ut3VeTj2kXorlGqS/BWmjXY5jro/xaeNnCHtbR88K9Atm9MKDJ 0TXClGdm7nqOqywNmyA67ez8xsNRdA777nMMwYl+wjWDrVDROq1GpTkM3Cg+freZn8 kunQaQ3/qhCyw== From: Christian Brauner Date: Wed, 29 Oct 2025 13:20:37 +0100 Subject: [PATCH v4 24/72] selftests/namespaces: second active reference count tests 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: <20251029-work-namespace-nstree-listns-v4-24-2e6f823ebdc0@kernel.org> References: <20251029-work-namespace-nstree-listns-v4-0-2e6f823ebdc0@kernel.org> In-Reply-To: <20251029-work-namespace-nstree-listns-v4-0-2e6f823ebdc0@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=2754; i=brauner@kernel.org; h=from:subject:message-id; bh=VPZa5Pr6JMy6E6vudTcQn3gJk3UQIlVxfxrLDEyUgG4=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWQysfXOsWKwFvXqeMrMwzHBZfHvQNMnJtJmLH5Tpr5We bNPY8KmjlIWBjEuBlkxRRaHdpNwueU8FZuNMjVg5rAygQxh4OIUgIksV2Vk+Ka+/MQ71Rpx9ZXX g64KsxYukNDYy2+2fGeL8vNbOn/PqzP8s3Wfq35vE//t2PkZBYITmGq+b+TQy+Wf/cI1cJvUvWc BnAA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Test namespace lifecycle: create a namespace in a child process, get a file handle while it's active, then try to reopen after the process exits (namespace becomes inactive). Signed-off-by: Christian Brauner --- .../selftests/namespaces/ns_active_ref_test.c | 81 ++++++++++++++++++++++ 1 file changed, 81 insertions(+) diff --git a/tools/testing/selftests/namespaces/ns_active_ref_test.c b/tools/testing/selftests/namespaces/ns_active_ref_test.c index 21514a537b26..7cade298c754 100644 --- a/tools/testing/selftests/namespaces/ns_active_ref_test.c +++ b/tools/testing/selftests/namespaces/ns_active_ref_test.c @@ -71,4 +71,85 @@ TEST(init_ns_always_active) free(handle); } +/* + * Test namespace lifecycle: create a namespace in a child process, + * get a file handle while it's active, then try to reopen after + * the process exits (namespace becomes inactive). + */ +TEST(ns_inactive_after_exit) +{ + struct file_handle *handle; + int mount_id; + int ret; + int fd; + int pipefd[2]; + pid_t pid; + int status; + char buf[sizeof(*handle) + MAX_HANDLE_SZ]; + + /* Create pipe for passing file handle from child */ + ASSERT_EQ(pipe(pipefd), 0); + + pid = fork(); + ASSERT_GE(pid, 0); + + if (pid == 0) { + /* Child process */ + close(pipefd[0]); + + /* Create new network namespace */ + ret = unshare(CLONE_NEWNET); + if (ret < 0) { + close(pipefd[1]); + exit(1); + } + + /* Open our new namespace */ + fd = open("/proc/self/ns/net", O_RDONLY); + if (fd < 0) { + close(pipefd[1]); + exit(1); + } + + /* Get file handle for the namespace */ + handle = (struct file_handle *)buf; + handle->handle_bytes = MAX_HANDLE_SZ; + ret = name_to_handle_at(fd, "", handle, &mount_id, AT_EMPTY_PATH); + close(fd); + + if (ret < 0) { + close(pipefd[1]); + exit(1); + } + + /* Send handle to parent */ + write(pipefd[1], buf, sizeof(*handle) + handle->handle_bytes); + close(pipefd[1]); + + /* Exit - namespace should become inactive */ + exit(0); + } + + /* Parent process */ + close(pipefd[1]); + + /* Read file handle from child */ + ret = read(pipefd[0], buf, sizeof(buf)); + close(pipefd[0]); + + /* Wait for child to exit */ + waitpid(pid, &status, 0); + ASSERT_TRUE(WIFEXITED(status)); + ASSERT_EQ(WEXITSTATUS(status), 0); + + ASSERT_GT(ret, 0); + handle = (struct file_handle *)buf; + + /* Try to reopen namespace - should fail with ENOENT since it's inactive */ + fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY); + ASSERT_LT(fd, 0); + /* Should fail with ENOENT (namespace inactive) or ESTALE */ + ASSERT_TRUE(errno == ENOENT || errno == ESTALE); +} + TEST_HARNESS_MAIN -- 2.47.3