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 230E7313E37; Fri, 24 Oct 2025 10:54:52 +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=1761303294; cv=none; b=c+Oo2w4YlY75mY9amOjRyDFvKv7Y9TMSgOcrAwhOKh+XKIzEjPwjLuNtkYho6/jgGXA14X1TVKZn61JxHeknfFgpEkOKbHfHWL796jIM491rdhckyFKtdCkpIAH9SU0fcw+fBPgJtWdt9r6XvLt+0fD2rR1LTL9SQqLcy01E4l8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761303294; c=relaxed/simple; bh=VPZa5Pr6JMy6E6vudTcQn3gJk3UQIlVxfxrLDEyUgG4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=mwLUmF39ONI+t+ZqvkgrDPiu5Jn3dQVfvTUYQgWOkPGNf1W2ZqqgLF4tYKTmcchSjQQroWMj5oSQKzedeGsVAR0n1pakbEt9PWVzsaoZE0e32rK5fr6CdlaKq69v1SiWjkH4TlP8kZ+234a2fujAFiQebpadkMS8MA/AAG6tZSQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LgFDUWg+; 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="LgFDUWg+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1FAC8C4CEF1; Fri, 24 Oct 2025 10:54:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761303292; bh=VPZa5Pr6JMy6E6vudTcQn3gJk3UQIlVxfxrLDEyUgG4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=LgFDUWg+W4XI1v3/3NCYmbLipq4BUGd3rFG/ZgLtGrDp4gBSy5EcY3RdIxIIzKLY/ 7Au+2Bx3aP57Mt2bbXoxfA7Rbkje4+HXE+Vqjm8cNTHGGlS9i76V2xyVUy+/oyJxkA FsDJ6TR13JL4YT5lj78v9lRO3/N/LeB8O3+vbHvJrr83O3XxGqlzm1YxXgfAzLhBmv Zq16R46T+a9j96Tb3RyvZdGl1wKwCiH/8alLKUp2Gkj6WAOrn16wiNI99jIR8k5bDa DZXgToZ673ZuX4smuKxmcmywrzjxNTFJAjFcvZBhHeU3xpRk4fRRcZVUS9fDfa+Uh/ E2HtDanAsvFUg== From: Christian Brauner Date: Fri, 24 Oct 2025 12:52:51 +0200 Subject: [PATCH v3 22/70] 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: <20251024-work-namespace-nstree-listns-v3-22-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=2754; i=brauner@kernel.org; h=from:subject:message-id; bh=VPZa5Pr6JMy6E6vudTcQn3gJk3UQIlVxfxrLDEyUgG4=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWT8jmptzvQT8X3qGlwT9Ub4t9lnMe7LvFUCH/dtZns/b TuveNfpjlIWBjEuBlkxRRaHdpNwueU8FZuNMjVg5rAygQxh4OIUgIkk3GFkOJs6V/L1zvzYFlHt DTGbFOW/u+9c+2l70deNv/mXb5YMn8jwP5gl5ZDrTOfSHWvTLO+KWLXIy1zdImlysEdtxuv59Ss 2sgEA 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