// SPDX-License-Identifier: GPL-2.0 #include <test_progs.h> void test_global_data_init(void) { const char *file = "./test_global_data.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__def(map)->value_size; 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); }