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selftests/namespaces: fourth listns() test 

Test listns() with LISTNS_CURRENT_USER.
List namespaces owned by current user namespace.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-42-2e6f823ebdc0@kernel.org
Tested-by: syzbot@syzkaller.appspotmail.com
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-10-29 13:20:55 +01:00
parent 46909d1343
commit abac8de3e5
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1 changed files with 33 additions and 0 deletions
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33
tools/testing/selftests/namespaces/listns_test.c
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@ -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