netdev - [PATCH v3 57/70] selftests/namespaces: fifth inactive namespace resurrection test

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Message-Id: <20251024-work-namespace-nstree-listns-v3-57-b6241981b72b@kernel.org>
Date: Fri, 24 Oct 2025 12:53:26 +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 v3 57/70] selftests/namespaces: fifth inactive namespace
 resurrection test

Test SIOCGSKNS fails on non-socket file descriptors.

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 .../testing/selftests/namespaces/siocgskns_test.c  | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/testing/selftests/namespaces/siocgskns_test.c b/tools/testing/selftests/namespaces/siocgskns_test.c
index 28e45954c4fa..bbfef3c51ac1 100644
--- a/tools/testing/selftests/namespaces/siocgskns_test.c
+++ b/tools/testing/selftests/namespaces/siocgskns_test.c
@@ -307,4 +307,30 @@ TEST(siocgskns_across_setns)
 	close(netns_a_fd);
 }
 
+/*
+ * Test SIOCGSKNS fails on non-socket file descriptors.
+ */
+TEST(siocgskns_non_socket)
+{
+	int fd;
+	int pipefd[2];
+
+	/* Test on regular file */
+	fd = open("/dev/null", O_RDONLY);
+	ASSERT_GE(fd, 0);
+
+	ASSERT_LT(ioctl(fd, SIOCGSKNS), 0);
+	ASSERT_TRUE(errno == ENOTTY || errno == EINVAL);
+	close(fd);
+
+	/* Test on pipe */
+	ASSERT_EQ(pipe(pipefd), 0);
+
+	ASSERT_LT(ioctl(pipefd[0], SIOCGSKNS), 0);
+	ASSERT_TRUE(errno == ENOTTY || errno == EINVAL);
+
+	close(pipefd[0]);
+	close(pipefd[1]);
+}
+
 TEST_HARNESS_MAIN

-- 
2.47.3