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 if (CHECK_FAIL(!obj)) 16 return; 17 18 map = bpf_object__find_map_by_name(obj, "test_glo.rodata"); 19 if (CHECK_FAIL(!map || !bpf_map__is_internal(map))) 20 goto out; 21 22 sz = bpf_map__def(map)->value_size; 23 newval = malloc(sz); 24 if (CHECK_FAIL(!newval)) 25 goto out; 26 27 memset(newval, 0, sz); 28 /* wrong size, should fail */ 29 err = bpf_map__set_initial_value(map, newval, sz - 1); 30 if (CHECK(!err, "reject set initial value wrong size", "err %d\n", err)) 31 goto out; 32 33 err = bpf_map__set_initial_value(map, newval, sz); 34 if (CHECK(err, "set initial value", "err %d\n", err)) 35 goto out; 36 37 err = bpf_object__load(obj); 38 if (CHECK_FAIL(err)) 39 goto out; 40 41 map_fd = bpf_map__fd(map); 42 if (CHECK_FAIL(map_fd < 0)) 43 goto out; 44 45 buff = malloc(sz); 46 if (buff) 47 err = bpf_map_lookup_elem(map_fd, &zero, buff); 48 if (CHECK(!buff || err || memcmp(buff, newval, sz), 49 "compare .rodata map data override", 50 "err %d errno %d\n", err, errno)) 51 goto out; 52 53 memset(newval, 1, sz); 54 /* object loaded - should fail */ 55 err = bpf_map__set_initial_value(map, newval, sz); 56 CHECK(!err, "reject set initial value after load", "err %d\n", err); 57 out: 58 free(buff); 59 free(newval); 60 bpf_object__close(obj); 61 } 62