1// SPDX-License-Identifier: GPL-2.0
 2#include <test_progs.h>
 3
 4void test_global_data_init(void)
 5{
 6	const char *file = "./test_global_data.bpf.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);
58out:
59	free(buff);
60	free(newval);
61	bpf_object__close(obj);
62}