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-rw-r--r--tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c b/tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c
new file mode 100644
index 000000000000..a64f7a02139c
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c
@@ -0,0 +1,249 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+
+void test_bpf_obj_id(void)
+{
+ const __u64 array_magic_value = 0xfaceb00c;
+ const __u32 array_key = 0;
+ const int nr_iters = 2;
+ const char *file = "./test_obj_id.o";
+ const char *expected_prog_name = "test_obj_id";
+ const char *expected_map_name = "test_map_id";
+ const __u64 nsec_per_sec = 1000000000;
+
+ struct bpf_object *objs[nr_iters];
+ int prog_fds[nr_iters], map_fds[nr_iters];
+ /* +1 to test for the info_len returned by kernel */
+ struct bpf_prog_info prog_infos[nr_iters + 1];
+ struct bpf_map_info map_infos[nr_iters + 1];
+ /* Each prog only uses one map. +1 to test nr_map_ids
+ * returned by kernel.
+ */
+ __u32 map_ids[nr_iters + 1];
+ char jited_insns[128], xlated_insns[128], zeros[128];
+ __u32 i, next_id, info_len, nr_id_found, duration = 0;
+ struct timespec real_time_ts, boot_time_ts;
+ int err = 0;
+ __u64 array_value;
+ uid_t my_uid = getuid();
+ time_t now, load_time;
+
+ err = bpf_prog_get_fd_by_id(0);
+ CHECK(err >= 0 || errno != ENOENT,
+ "get-fd-by-notexist-prog-id", "err %d errno %d\n", err, errno);
+
+ err = bpf_map_get_fd_by_id(0);
+ CHECK(err >= 0 || errno != ENOENT,
+ "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno);
+
+ for (i = 0; i < nr_iters; i++)
+ objs[i] = NULL;
+
+ /* Check bpf_obj_get_info_by_fd() */
+ bzero(zeros, sizeof(zeros));
+ for (i = 0; i < nr_iters; i++) {
+ now = time(NULL);
+ err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER,
+ &objs[i], &prog_fds[i]);
+ /* test_obj_id.o is a dumb prog. It should never fail
+ * to load.
+ */
+ if (err)
+ error_cnt++;
+ assert(!err);
+
+ /* Insert a magic value to the map */
+ map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id");
+ assert(map_fds[i] >= 0);
+ err = bpf_map_update_elem(map_fds[i], &array_key,
+ &array_magic_value, 0);
+ assert(!err);
+
+ /* Check getting map info */
+ info_len = sizeof(struct bpf_map_info) * 2;
+ bzero(&map_infos[i], info_len);
+ err = bpf_obj_get_info_by_fd(map_fds[i], &map_infos[i],
+ &info_len);
+ if (CHECK(err ||
+ map_infos[i].type != BPF_MAP_TYPE_ARRAY ||
+ map_infos[i].key_size != sizeof(__u32) ||
+ map_infos[i].value_size != sizeof(__u64) ||
+ map_infos[i].max_entries != 1 ||
+ map_infos[i].map_flags != 0 ||
+ info_len != sizeof(struct bpf_map_info) ||
+ strcmp((char *)map_infos[i].name, expected_map_name),
+ "get-map-info(fd)",
+ "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",
+ err, errno,
+ map_infos[i].type, BPF_MAP_TYPE_ARRAY,
+ info_len, sizeof(struct bpf_map_info),
+ map_infos[i].key_size,
+ map_infos[i].value_size,
+ map_infos[i].max_entries,
+ map_infos[i].map_flags,
+ map_infos[i].name, expected_map_name))
+ goto done;
+
+ /* Check getting prog info */
+ info_len = sizeof(struct bpf_prog_info) * 2;
+ bzero(&prog_infos[i], info_len);
+ bzero(jited_insns, sizeof(jited_insns));
+ bzero(xlated_insns, sizeof(xlated_insns));
+ prog_infos[i].jited_prog_insns = ptr_to_u64(jited_insns);
+ prog_infos[i].jited_prog_len = sizeof(jited_insns);
+ prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns);
+ prog_infos[i].xlated_prog_len = sizeof(xlated_insns);
+ prog_infos[i].map_ids = ptr_to_u64(map_ids + i);
+ prog_infos[i].nr_map_ids = 2;
+ err = clock_gettime(CLOCK_REALTIME, &real_time_ts);
+ assert(!err);
+ err = clock_gettime(CLOCK_BOOTTIME, &boot_time_ts);
+ assert(!err);
+ err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i],
+ &info_len);
+ load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec)
+ + (prog_infos[i].load_time / nsec_per_sec);
+ if (CHECK(err ||
+ prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER ||
+ info_len != sizeof(struct bpf_prog_info) ||
+ (jit_enabled && !prog_infos[i].jited_prog_len) ||
+ (jit_enabled &&
+ !memcmp(jited_insns, zeros, sizeof(zeros))) ||
+ !prog_infos[i].xlated_prog_len ||
+ !memcmp(xlated_insns, zeros, sizeof(zeros)) ||
+ load_time < now - 60 || load_time > now + 60 ||
+ prog_infos[i].created_by_uid != my_uid ||
+ prog_infos[i].nr_map_ids != 1 ||
+ *(int *)(long)prog_infos[i].map_ids != map_infos[i].id ||
+ strcmp((char *)prog_infos[i].name, expected_prog_name),
+ "get-prog-info(fd)",
+ "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",
+ err, errno, i,
+ prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
+ info_len, sizeof(struct bpf_prog_info),
+ jit_enabled,
+ prog_infos[i].jited_prog_len,
+ prog_infos[i].xlated_prog_len,
+ !!memcmp(jited_insns, zeros, sizeof(zeros)),
+ !!memcmp(xlated_insns, zeros, sizeof(zeros)),
+ load_time, now,
+ prog_infos[i].created_by_uid, my_uid,
+ prog_infos[i].nr_map_ids, 1,
+ *(int *)(long)prog_infos[i].map_ids, map_infos[i].id,
+ prog_infos[i].name, expected_prog_name))
+ goto done;
+ }
+
+ /* Check bpf_prog_get_next_id() */
+ nr_id_found = 0;
+ next_id = 0;
+ while (!bpf_prog_get_next_id(next_id, &next_id)) {
+ struct bpf_prog_info prog_info = {};
+ __u32 saved_map_id;
+ int prog_fd;
+
+ info_len = sizeof(prog_info);
+
+ prog_fd = bpf_prog_get_fd_by_id(next_id);
+ if (prog_fd < 0 && errno == ENOENT)
+ /* The bpf_prog is in the dead row */
+ continue;
+ if (CHECK(prog_fd < 0, "get-prog-fd(next_id)",
+ "prog_fd %d next_id %d errno %d\n",
+ prog_fd, next_id, errno))
+ break;
+
+ for (i = 0; i < nr_iters; i++)
+ if (prog_infos[i].id == next_id)
+ break;
+
+ if (i == nr_iters)
+ continue;
+
+ nr_id_found++;
+
+ /* Negative test:
+ * prog_info.nr_map_ids = 1
+ * prog_info.map_ids = NULL
+ */
+ prog_info.nr_map_ids = 1;
+ err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
+ if (CHECK(!err || errno != EFAULT,
+ "get-prog-fd-bad-nr-map-ids", "err %d errno %d(%d)",
+ err, errno, EFAULT))
+ break;
+ bzero(&prog_info, sizeof(prog_info));
+ info_len = sizeof(prog_info);
+
+ saved_map_id = *(int *)((long)prog_infos[i].map_ids);
+ prog_info.map_ids = prog_infos[i].map_ids;
+ prog_info.nr_map_ids = 2;
+ err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
+ prog_infos[i].jited_prog_insns = 0;
+ prog_infos[i].xlated_prog_insns = 0;
+ CHECK(err || info_len != sizeof(struct bpf_prog_info) ||
+ memcmp(&prog_info, &prog_infos[i], info_len) ||
+ *(int *)(long)prog_info.map_ids != saved_map_id,
+ "get-prog-info(next_id->fd)",
+ "err %d errno %d info_len %u(%Zu) memcmp %d map_id %u(%u)\n",
+ err, errno, info_len, sizeof(struct bpf_prog_info),
+ memcmp(&prog_info, &prog_infos[i], info_len),
+ *(int *)(long)prog_info.map_ids, saved_map_id);
+ close(prog_fd);
+ }
+ CHECK(nr_id_found != nr_iters,
+ "check total prog id found by get_next_id",
+ "nr_id_found %u(%u)\n",
+ nr_id_found, nr_iters);
+
+ /* Check bpf_map_get_next_id() */
+ nr_id_found = 0;
+ next_id = 0;
+ while (!bpf_map_get_next_id(next_id, &next_id)) {
+ struct bpf_map_info map_info = {};
+ int map_fd;
+
+ info_len = sizeof(map_info);
+
+ map_fd = bpf_map_get_fd_by_id(next_id);
+ if (map_fd < 0 && errno == ENOENT)
+ /* The bpf_map is in the dead row */
+ continue;
+ if (CHECK(map_fd < 0, "get-map-fd(next_id)",
+ "map_fd %d next_id %u errno %d\n",
+ map_fd, next_id, errno))
+ break;
+
+ for (i = 0; i < nr_iters; i++)
+ if (map_infos[i].id == next_id)
+ break;
+
+ if (i == nr_iters)
+ continue;
+
+ nr_id_found++;
+
+ err = bpf_map_lookup_elem(map_fd, &array_key, &array_value);
+ assert(!err);
+
+ err = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len);
+ CHECK(err || info_len != sizeof(struct bpf_map_info) ||
+ memcmp(&map_info, &map_infos[i], info_len) ||
+ array_value != array_magic_value,
+ "check get-map-info(next_id->fd)",
+ "err %d errno %d info_len %u(%Zu) memcmp %d array_value %llu(%llu)\n",
+ err, errno, info_len, sizeof(struct bpf_map_info),
+ memcmp(&map_info, &map_infos[i], info_len),
+ array_value, array_magic_value);
+
+ close(map_fd);
+ }
+ CHECK(nr_id_found != nr_iters,
+ "check total map id found by get_next_id",
+ "nr_id_found %u(%u)\n",
+ nr_id_found, nr_iters);
+
+done:
+ for (i = 0; i < nr_iters; i++)
+ bpf_object__close(objs[i]);
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.