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selftests/namespaces: check listns() with a U64_MAX cursor

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Pass the largest possible namespace id as the cursor and check that
listns() fails with ENOENT instead of starting over:

- in the unified tree

- in a type-specific tree

- in the owner tree of the caller's user namespace

Nothing can come after the largest possible id.

Link: https://patch.msgid.link/20261021-work-mount-statmount_listns_fixes-v1-6-8917a4c1bd14@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2026-10-21 13:46:59 +02:00
parent 2a1887000e
commit 486b257357
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1 changed files with 34 additions and 0 deletions
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34
tools/testing/selftests/namespaces/listns_test.c
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@ -676,4 +676,38 @@ TEST(listns_error_cases)
}
}
/*
* A cursor at the largest possible namespace id must not wrap around and
* restart the listing from the beginning.
*/
TEST(listns_cursor_max)
{
struct ns_id_req req = {
.size = sizeof(req),
.ns_id = ULLONG_MAX,
};
__u64 ns_ids[10];
ssize_t ret;
/* unified tree */
ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
if (ret < 0 && errno == ENOSYS)
SKIP(return, "listns() not supported");
ASSERT_EQ(ret, -1);
ASSERT_EQ(errno, ENOENT);
/* type-specific tree */
req.ns_type = CLONE_NEWUSER;
ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
ASSERT_EQ(ret, -1);
ASSERT_EQ(errno, ENOENT);
/* owner tree */
req.ns_type = 0;
req.user_ns_id = LISTNS_CURRENT_USER;
ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
ASSERT_EQ(ret, -1);
ASSERT_EQ(errno, ENOENT);
}
TEST_HARNESS_MAIN