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.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);
58 out:
59 free(buff);
60 free(newval);
61 bpf_object__close(obj);
62 }
63
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