1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 
4 void test_global_data_init(void)
5 {
6 	const char *file = "./test_global_data.o";
7 	int err = -ENOMEM, map_fd, zero = 0;
8 	__u8 *buff = NULL, *newval = NULL;
9 	struct bpf_object *obj;
10 	struct bpf_map *map;
11         __u32 duration = 0;
12 	size_t sz;
13 
14 	obj = bpf_object__open_file(file, NULL);
15 	err = libbpf_get_error(obj);
16 	if (CHECK_FAIL(err))
17 		return;
18 
19 	map = bpf_object__find_map_by_name(obj, ".rodata");
20 	if (CHECK_FAIL(!map || !bpf_map__is_internal(map)))
21 		goto out;
22 
23 	sz = bpf_map__value_size(map);
24 	newval = malloc(sz);
25 	if (CHECK_FAIL(!newval))
26 		goto out;
27 
28 	memset(newval, 0, sz);
29 	/* wrong size, should fail */
30 	err = bpf_map__set_initial_value(map, newval, sz - 1);
31 	if (CHECK(!err, "reject set initial value wrong size", "err %d\n", err))
32 		goto out;
33 
34 	err = bpf_map__set_initial_value(map, newval, sz);
35 	if (CHECK(err, "set initial value", "err %d\n", err))
36 		goto out;
37 
38 	err = bpf_object__load(obj);
39 	if (CHECK_FAIL(err))
40 		goto out;
41 
42 	map_fd = bpf_map__fd(map);
43 	if (CHECK_FAIL(map_fd < 0))
44 		goto out;
45 
46 	buff = malloc(sz);
47 	if (buff)
48 		err = bpf_map_lookup_elem(map_fd, &zero, buff);
49 	if (CHECK(!buff || err || memcmp(buff, newval, sz),
50 		  "compare .rodata map data override",
51 		  "err %d errno %d\n", err, errno))
52 		goto out;
53 
54 	memset(newval, 1, sz);
55 	/* object loaded - should fail */
56 	err = bpf_map__set_initial_value(map, newval, sz);
57 	CHECK(!err, "reject set initial value after load", "err %d\n", err);
58 out:
59 	free(buff);
60 	free(newval);
61 	bpf_object__close(obj);
62 }
63