From nobody Sat Feb 7 09:29:24 2026 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 18900382865; Wed, 22 Oct 2025 16:10:58 +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=1761149459; cv=none; b=eXdHnSwRN2LMVRuy5Iq3yyCGOcdhcyU8IPY110DOKj0091wif4Ol/5fWzEzHQt+ZRWTxXmwdQ8HwSFJ9VvXXMAy8z+o8wtX4AFW5EXjKBcC+Vuqso5ORjncFb4jxesxbNSCk3bOMEWSbappDjCTXuT3qEIiM+JC0GPJOijhIWNE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761149459; c=relaxed/simple; bh=Gh/yPS1NyhqsBzLO+DmIzxsHN6EXBn9HWj+WnIyz1JI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=F0mQwk0ErjcWfw8NQ3g+Mle8wDhANW/G7SLgleBp4J/3DMtqLhIoebKho9pybp8x19YcgNSVB8TQzYTlIMpKY9lqJ/wkXifoJM8O/gLFRHeRjDzme0VvNEqudFmuvbD/1aEL07wMJlNZIadrO7C8wXjyTuvnQVzBzW2JQRvqYjo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OTtsET+w; 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="OTtsET+w" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ADA2EC4CEE7; Wed, 22 Oct 2025 16:10:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761149458; bh=Gh/yPS1NyhqsBzLO+DmIzxsHN6EXBn9HWj+WnIyz1JI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=OTtsET+wiMrbHLQTHVyTKNyKffGvyp+8IrYbC4ycd1U7SM2yWIfYM4661F0CJ72ej ev05/DU7TlZrq170dY9mvbo5SGjKNvgy9cRAiGquMc4OC6f4lXNpcrpYbPqz3WQPco AiH0QkQnHtqj9KdJAyavmxWR+ZmAkP/DKciXvwwk0pdYWvqgAFjS955a4THbTQ0A3k PX68bKFwmhvjxZ857SWzYwpgXgBFi1vR4d39U1aJmTXOp+yUc/777Iyu4dukXlSDIJ meXFrhD9vn8e9U0rYJbwB8P6HjGBFnD2oshYOc06Qv5MO03flZDZ4MdJSfp3ZoDGOg 6sk8jXnKouHlw== From: Christian Brauner Date: Wed, 22 Oct 2025 18:06:33 +0200 Subject: [PATCH v2 55/63] selftests/namespaces: fourth inactive namespace resurrection test Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251022-work-namespace-nstree-listns-v2-55-71a588572371@kernel.org> References: <20251022-work-namespace-nstree-listns-v2-0-71a588572371@kernel.org> In-Reply-To: <20251022-work-namespace-nstree-listns-v2-0-71a588572371@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=2063; i=brauner@kernel.org; h=from:subject:message-id; bh=Gh/yPS1NyhqsBzLO+DmIzxsHN6EXBn9HWj+WnIyz1JI=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWT8ZHi+j/eNPTfPjyVnEvgPaxU/Xz773fP1fqXJp+fec +J7d3F+a0cpC4MYF4OsmCKLQ7tJuNxynorNRpkaMHNYmUCGMHBxCsBELn9m+J9U+ME6julV8G3J pPmm5/TL5svMTy4pLf63UntPzuvDCZKMDBNfvp20UyDjVTzfT7ET6qdCz2rrPE9dNee5lYjJn3l vy9kA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Test SIOCGSKNS across setns. Create a socket in netns A, switch to netns B, verify SIOCGSKNS still returns netns A. Signed-off-by: Christian Brauner --- .../testing/selftests/namespaces/siocgskns_test.c | 51 ++++++++++++++++++= ++++ 1 file changed, 51 insertions(+) diff --git a/tools/testing/selftests/namespaces/siocgskns_test.c b/tools/te= sting/selftests/namespaces/siocgskns_test.c index 3f46ac0c96df..3aed6e3d60a3 100644 --- a/tools/testing/selftests/namespaces/siocgskns_test.c +++ b/tools/testing/selftests/namespaces/siocgskns_test.c @@ -257,4 +257,55 @@ TEST(siocgskns_socket_types) close(sock_udp); } =20 +/* + * Test SIOCGSKNS across setns. + * Create a socket in netns A, switch to netns B, verify SIOCGSKNS still + * returns netns A. + */ +TEST(siocgskns_across_setns) +{ + int sock_fd, netns_a_fd, netns_b_fd, result_fd; + struct stat st_a; + + /* Get current netns (A) */ + netns_a_fd =3D open("/proc/self/ns/net", O_RDONLY); + ASSERT_GE(netns_a_fd, 0); + ASSERT_EQ(fstat(netns_a_fd, &st_a), 0); + + /* Create socket in netns A */ + sock_fd =3D socket(AF_INET, SOCK_STREAM, 0); + ASSERT_GE(sock_fd, 0); + + /* Create new netns (B) */ + ASSERT_EQ(unshare(CLONE_NEWNET), 0); + + netns_b_fd =3D open("/proc/self/ns/net", O_RDONLY); + ASSERT_GE(netns_b_fd, 0); + + /* Get netns from socket created in A */ + result_fd =3D ioctl(sock_fd, SIOCGSKNS); + if (result_fd < 0) { + close(sock_fd); + setns(netns_a_fd, CLONE_NEWNET); + close(netns_a_fd); + close(netns_b_fd); + if (errno =3D=3D ENOTTY || errno =3D=3D EINVAL) + SKIP(return, "SIOCGSKNS not supported"); + ASSERT_GE(result_fd, 0); + } + + /* Verify it still points to netns A */ + struct stat st_result_stat; + ASSERT_EQ(fstat(result_fd, &st_result_stat), 0); + ASSERT_EQ(st_a.st_ino, st_result_stat.st_ino); + + close(result_fd); + close(sock_fd); + close(netns_b_fd); + + /* Restore original netns */ + ASSERT_EQ(setns(netns_a_fd, CLONE_NEWNET), 0); + close(netns_a_fd); +} + TEST_HARNESS_MAIN --=20 2.47.3