netdev - [PATCH RFC DRAFT 43/50] selftests/namespaces: ninth listns() test

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Message-Id: <20251021-work-namespace-nstree-listns-v1-43-ad44261a8a5b@kernel.org>
Date: Tue, 21 Oct 2025 13:43:49 +0200
From: Christian Brauner <brauner@...nel.org>
To: linux-fsdevel@...r.kernel.org, Josef Bacik <josef@...icpanda.com>, 
 Jeff Layton <jlayton@...nel.org>
Cc: Jann Horn <jannh@...gle.com>, Mike Yuan <me@...dnzj.com>, 
 Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>, 
 Lennart Poettering <mzxreary@...inter.de>, 
 Daan De Meyer <daan.j.demeyer@...il.com>, Aleksa Sarai <cyphar@...har.com>, 
 Amir Goldstein <amir73il@...il.com>, Tejun Heo <tj@...nel.org>, 
 Johannes Weiner <hannes@...xchg.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
 linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, bpf@...r.kernel.org, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 netdev@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, 
 Christian Brauner <brauner@...nel.org>
Subject: [PATCH RFC DRAFT 43/50] selftests/namespaces: ninth listns() test

Test error cases for listns().

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 tools/testing/selftests/namespaces/listns_test.c | 51 ++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/tools/testing/selftests/namespaces/listns_test.c b/tools/testing/selftests/namespaces/listns_test.c
index ddf4509d5cd6..eb44f50ab77a 100644
--- a/tools/testing/selftests/namespaces/listns_test.c
+++ b/tools/testing/selftests/namespaces/listns_test.c
@@ -602,4 +602,55 @@ TEST(listns_hierarchical_visibility)
 	waitpid(pid, &status, 0);
 }
 
+/*
+ * Test error cases for listns().
+ */
+TEST(listns_error_cases)
+{
+	struct ns_id_req req = {
+		.size = sizeof(req),
+		.spare = 0,
+		.ns_id = 0,
+		.ns_type = 0,
+		.spare2 = 0,
+		.user_ns_id = 0,
+	};
+	__u64 ns_ids[10];
+	int ret;
+
+	/* Test with invalid flags */
+	ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0xFFFF);
+	if (ret >= 0 || errno == ENOSYS) {
+		if (errno != ENOSYS) {
+			TH_LOG("Warning: Expected EINVAL for invalid flags, got success");
+		}
+	} else {
+		ASSERT_EQ(errno, EINVAL);
+	}
+
+	/* Test with NULL ns_ids array */
+	ret = sys_listns(&req, NULL, 10, 0);
+	if (ret >= 0) {
+		TH_LOG("Warning: Expected EFAULT for NULL array, got success");
+	}
+
+	/* Test with invalid spare field */
+	req.spare = 1;
+	ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+	if (ret >= 0 || errno == ENOSYS) {
+		if (errno != ENOSYS) {
+			TH_LOG("Warning: Expected EINVAL for non-zero spare, got success");
+		}
+	}
+	req.spare = 0;
+
+	/* Test with huge nr_ns_ids */
+	ret = sys_listns(&req, ns_ids, 2000000, 0);
+	if (ret >= 0 || errno == ENOSYS) {
+		if (errno != ENOSYS) {
+			TH_LOG("Warning: Expected EOVERFLOW for huge count, got success");
+		}
+	}
+}
+
 TEST_HARNESS_MAIN

-- 
2.47.3