1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 4 void test_bpf_obj_id(void) 5 { 6 const __u64 array_magic_value = 0xfaceb00c; 7 const __u32 array_key = 0; 8 const int nr_iters = 2; 9 const char *file = "./test_obj_id.o"; 10 const char *expected_prog_name = "test_obj_id"; 11 const char *expected_map_name = "test_map_id"; 12 const __u64 nsec_per_sec = 1000000000; 13 14 struct bpf_object *objs[nr_iters]; 15 int prog_fds[nr_iters], map_fds[nr_iters]; 16 /* +1 to test for the info_len returned by kernel */ 17 struct bpf_prog_info prog_infos[nr_iters + 1]; 18 struct bpf_map_info map_infos[nr_iters + 1]; 19 /* Each prog only uses one map. +1 to test nr_map_ids 20 * returned by kernel. 21 */ 22 __u32 map_ids[nr_iters + 1]; 23 char jited_insns[128], xlated_insns[128], zeros[128]; 24 __u32 i, next_id, info_len, nr_id_found, duration = 0; 25 struct timespec real_time_ts, boot_time_ts; 26 int err = 0; 27 __u64 array_value; 28 uid_t my_uid = getuid(); 29 time_t now, load_time; 30 31 err = bpf_prog_get_fd_by_id(0); 32 CHECK(err >= 0 || errno != ENOENT, 33 "get-fd-by-notexist-prog-id", "err %d errno %d\n", err, errno); 34 35 err = bpf_map_get_fd_by_id(0); 36 CHECK(err >= 0 || errno != ENOENT, 37 "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno); 38 39 for (i = 0; i < nr_iters; i++) 40 objs[i] = NULL; 41 42 /* Check bpf_obj_get_info_by_fd() */ 43 bzero(zeros, sizeof(zeros)); 44 for (i = 0; i < nr_iters; i++) { 45 now = time(NULL); 46 err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER, 47 &objs[i], &prog_fds[i]); 48 /* test_obj_id.o is a dumb prog. It should never fail 49 * to load. 50 */ 51 if (CHECK_FAIL(err)) 52 continue; 53 54 /* Insert a magic value to the map */ 55 map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id"); 56 if (CHECK_FAIL(map_fds[i] < 0)) 57 goto done; 58 err = bpf_map_update_elem(map_fds[i], &array_key, 59 &array_magic_value, 0); 60 if (CHECK_FAIL(err)) 61 goto done; 62 63 /* Check getting map info */ 64 info_len = sizeof(struct bpf_map_info) * 2; 65 bzero(&map_infos[i], info_len); 66 err = bpf_obj_get_info_by_fd(map_fds[i], &map_infos[i], 67 &info_len); 68 if (CHECK(err || 69 map_infos[i].type != BPF_MAP_TYPE_ARRAY || 70 map_infos[i].key_size != sizeof(__u32) || 71 map_infos[i].value_size != sizeof(__u64) || 72 map_infos[i].max_entries != 1 || 73 map_infos[i].map_flags != 0 || 74 info_len != sizeof(struct bpf_map_info) || 75 strcmp((char *)map_infos[i].name, expected_map_name), 76 "get-map-info(fd)", 77 "err %d errno %d type %d(%d) info_len %u(%zu) key_size %u value_size %u max_entries %u map_flags %X name %s(%s)\n", 78 err, errno, 79 map_infos[i].type, BPF_MAP_TYPE_ARRAY, 80 info_len, sizeof(struct bpf_map_info), 81 map_infos[i].key_size, 82 map_infos[i].value_size, 83 map_infos[i].max_entries, 84 map_infos[i].map_flags, 85 map_infos[i].name, expected_map_name)) 86 goto done; 87 88 /* Check getting prog info */ 89 info_len = sizeof(struct bpf_prog_info) * 2; 90 bzero(&prog_infos[i], info_len); 91 bzero(jited_insns, sizeof(jited_insns)); 92 bzero(xlated_insns, sizeof(xlated_insns)); 93 prog_infos[i].jited_prog_insns = ptr_to_u64(jited_insns); 94 prog_infos[i].jited_prog_len = sizeof(jited_insns); 95 prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns); 96 prog_infos[i].xlated_prog_len = sizeof(xlated_insns); 97 prog_infos[i].map_ids = ptr_to_u64(map_ids + i); 98 prog_infos[i].nr_map_ids = 2; 99 err = clock_gettime(CLOCK_REALTIME, &real_time_ts); 100 if (CHECK_FAIL(err)) 101 goto done; 102 err = clock_gettime(CLOCK_BOOTTIME, &boot_time_ts); 103 if (CHECK_FAIL(err)) 104 goto done; 105 err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i], 106 &info_len); 107 load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec) 108 + (prog_infos[i].load_time / nsec_per_sec); 109 if (CHECK(err || 110 prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER || 111 info_len != sizeof(struct bpf_prog_info) || 112 (env.jit_enabled && !prog_infos[i].jited_prog_len) || 113 (env.jit_enabled && 114 !memcmp(jited_insns, zeros, sizeof(zeros))) || 115 !prog_infos[i].xlated_prog_len || 116 !memcmp(xlated_insns, zeros, sizeof(zeros)) || 117 load_time < now - 60 || load_time > now + 60 || 118 prog_infos[i].created_by_uid != my_uid || 119 prog_infos[i].nr_map_ids != 1 || 120 *(int *)(long)prog_infos[i].map_ids != map_infos[i].id || 121 strcmp((char *)prog_infos[i].name, expected_prog_name), 122 "get-prog-info(fd)", 123 "err %d errno %d i %d type %d(%d) info_len %u(%zu) jit_enabled %d jited_prog_len %u xlated_prog_len %u jited_prog %d xlated_prog %d load_time %lu(%lu) uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) name %s(%s)\n", 124 err, errno, i, 125 prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER, 126 info_len, sizeof(struct bpf_prog_info), 127 env.jit_enabled, 128 prog_infos[i].jited_prog_len, 129 prog_infos[i].xlated_prog_len, 130 !!memcmp(jited_insns, zeros, sizeof(zeros)), 131 !!memcmp(xlated_insns, zeros, sizeof(zeros)), 132 load_time, now, 133 prog_infos[i].created_by_uid, my_uid, 134 prog_infos[i].nr_map_ids, 1, 135 *(int *)(long)prog_infos[i].map_ids, map_infos[i].id, 136 prog_infos[i].name, expected_prog_name)) 137 goto done; 138 } 139 140 /* Check bpf_prog_get_next_id() */ 141 nr_id_found = 0; 142 next_id = 0; 143 while (!bpf_prog_get_next_id(next_id, &next_id)) { 144 struct bpf_prog_info prog_info = {}; 145 __u32 saved_map_id; 146 int prog_fd; 147 148 info_len = sizeof(prog_info); 149 150 prog_fd = bpf_prog_get_fd_by_id(next_id); 151 if (prog_fd < 0 && errno == ENOENT) 152 /* The bpf_prog is in the dead row */ 153 continue; 154 if (CHECK(prog_fd < 0, "get-prog-fd(next_id)", 155 "prog_fd %d next_id %d errno %d\n", 156 prog_fd, next_id, errno)) 157 break; 158 159 for (i = 0; i < nr_iters; i++) 160 if (prog_infos[i].id == next_id) 161 break; 162 163 if (i == nr_iters) 164 continue; 165 166 nr_id_found++; 167 168 /* Negative test: 169 * prog_info.nr_map_ids = 1 170 * prog_info.map_ids = NULL 171 */ 172 prog_info.nr_map_ids = 1; 173 err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len); 174 if (CHECK(!err || errno != EFAULT, 175 "get-prog-fd-bad-nr-map-ids", "err %d errno %d(%d)", 176 err, errno, EFAULT)) 177 break; 178 bzero(&prog_info, sizeof(prog_info)); 179 info_len = sizeof(prog_info); 180 181 saved_map_id = *(int *)((long)prog_infos[i].map_ids); 182 prog_info.map_ids = prog_infos[i].map_ids; 183 prog_info.nr_map_ids = 2; 184 err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len); 185 prog_infos[i].jited_prog_insns = 0; 186 prog_infos[i].xlated_prog_insns = 0; 187 CHECK(err || info_len != sizeof(struct bpf_prog_info) || 188 memcmp(&prog_info, &prog_infos[i], info_len) || 189 *(int *)(long)prog_info.map_ids != saved_map_id, 190 "get-prog-info(next_id->fd)", 191 "err %d errno %d info_len %u(%zu) memcmp %d map_id %u(%u)\n", 192 err, errno, info_len, sizeof(struct bpf_prog_info), 193 memcmp(&prog_info, &prog_infos[i], info_len), 194 *(int *)(long)prog_info.map_ids, saved_map_id); 195 close(prog_fd); 196 } 197 CHECK(nr_id_found != nr_iters, 198 "check total prog id found by get_next_id", 199 "nr_id_found %u(%u)\n", 200 nr_id_found, nr_iters); 201 202 /* Check bpf_map_get_next_id() */ 203 nr_id_found = 0; 204 next_id = 0; 205 while (!bpf_map_get_next_id(next_id, &next_id)) { 206 struct bpf_map_info map_info = {}; 207 int map_fd; 208 209 info_len = sizeof(map_info); 210 211 map_fd = bpf_map_get_fd_by_id(next_id); 212 if (map_fd < 0 && errno == ENOENT) 213 /* The bpf_map is in the dead row */ 214 continue; 215 if (CHECK(map_fd < 0, "get-map-fd(next_id)", 216 "map_fd %d next_id %u errno %d\n", 217 map_fd, next_id, errno)) 218 break; 219 220 for (i = 0; i < nr_iters; i++) 221 if (map_infos[i].id == next_id) 222 break; 223 224 if (i == nr_iters) 225 continue; 226 227 nr_id_found++; 228 229 err = bpf_map_lookup_elem(map_fd, &array_key, &array_value); 230 if (CHECK_FAIL(err)) 231 goto done; 232 233 err = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len); 234 CHECK(err || info_len != sizeof(struct bpf_map_info) || 235 memcmp(&map_info, &map_infos[i], info_len) || 236 array_value != array_magic_value, 237 "check get-map-info(next_id->fd)", 238 "err %d errno %d info_len %u(%zu) memcmp %d array_value %llu(%llu)\n", 239 err, errno, info_len, sizeof(struct bpf_map_info), 240 memcmp(&map_info, &map_infos[i], info_len), 241 array_value, array_magic_value); 242 243 close(map_fd); 244 } 245 CHECK(nr_id_found != nr_iters, 246 "check total map id found by get_next_id", 247 "nr_id_found %u(%u)\n", 248 nr_id_found, nr_iters); 249 250 done: 251 for (i = 0; i < nr_iters; i++) 252 bpf_object__close(objs[i]); 253 } 254