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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
void test_global_data_init(void)
{
const char *file = "./test_global_data.bpf.o";
int err = -ENOMEM, map_fd, zero = 0;
__u8 *buff = NULL, *newval = NULL;
struct bpf_object *obj;
struct bpf_map *map;
__u32 duration = 0;
size_t sz;
obj = bpf_object__open_file(file, NULL);
err = libbpf_get_error(obj);
if (CHECK_FAIL(err))
return;
map = bpf_object__find_map_by_name(obj, ".rodata");
if (CHECK_FAIL(!map || !bpf_map__is_internal(map)))
goto out;
sz = bpf_map__value_size(map);
newval = malloc(sz);
if (CHECK_FAIL(!newval))
goto out;
memset(newval, 0, sz);
/* wrong size, should fail */
err = bpf_map__set_initial_value(map, newval, sz - 1);
if (CHECK(!err, "reject set initial value wrong size", "err %d\n", err))
goto out;
err = bpf_map__set_initial_value(map, newval, sz);
if (CHECK(err, "set initial value", "err %d\n", err))
goto out;
err = bpf_object__load(obj);
if (CHECK_FAIL(err))
goto out;
map_fd = bpf_map__fd(map);
if (CHECK_FAIL(map_fd < 0))
goto out;
buff = malloc(sz);
if (buff)
err = bpf_map_lookup_elem(map_fd, &zero, buff);
if (CHECK(!buff || err || memcmp(buff, newval, sz),
"compare .rodata map data override",
"err %d errno %d\n", err, errno))
goto out;
memset(newval, 1, sz);
/* object loaded - should fail */
err = bpf_map__set_initial_value(map, newval, sz);
CHECK(!err, "reject set initial value after load", "err %d\n", err);
out:
free(buff);
free(newval);
bpf_object__close(obj);
}
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