[PATCH v2 39/63] selftests/namespaces: fourth listns() test
From: Christian Brauner <brauner@kernel.org>
Date: 2025-10-22 16:09:33
Also in:
bpf, cgroups, linux-fsdevel, lkml
Subsystem:
kernel selftest framework, the rest · Maintainers:
Shuah Khan, Linus Torvalds
Test listns() with LISTNS_CURRENT_USER. List namespaces owned by current user namespace. Signed-off-by: Christian Brauner <brauner@kernel.org> --- tools/testing/selftests/namespaces/listns_test.c | 33 ++++++++++++++++++++++++ 1 file changed, 33 insertions(+)
diff --git a/tools/testing/selftests/namespaces/listns_test.c b/tools/testing/selftests/namespaces/listns_test.c
index 7dff63a00263..457298cb4c64 100644
--- a/tools/testing/selftests/namespaces/listns_test.c
+++ b/tools/testing/selftests/namespaces/listns_test.c@@ -168,4 +168,37 @@ TEST(listns_pagination) } } +/* + * Test listns() with LISTNS_CURRENT_USER. + * List namespaces owned by current user namespace. + */ +TEST(listns_current_user) +{ + struct ns_id_req req = { + .size = sizeof(req), + .spare = 0, + .ns_id = 0, + .ns_type = 0, + .spare2 = 0, + .user_ns_id = LISTNS_CURRENT_USER, + }; + __u64 ns_ids[100]; + ssize_t ret; + + ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0); + if (ret < 0) { + if (errno == ENOSYS) + SKIP(return, "listns() not supported"); + TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno); + ASSERT_TRUE(false); + } + ASSERT_GE(ret, 0); + + /* Should find at least the initial namespaces if we're in init_user_ns */ + TH_LOG("Found %zd namespaces owned by current user namespace", ret); + + for (ssize_t i = 0; i < ret; i++) + TH_LOG(" [%zd] ns_id: %llu", i, (unsigned long long)ns_ids[i]); +} + TEST_HARNESS_MAIN
--
2.47.3