tools/testing/selftests/bpf/prog_tests/bpf_obj_id.c - linux/kernel/git/bpf/bpf - Git at Google

 // 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 (CHECK_FAIL(err))
 			continue;

 		/* Insert a magic value to the map */
 		map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id");
 		if (CHECK_FAIL(map_fds[i] < 0))
 			goto done;
 		err = bpf_map_update_elem(map_fds[i], &array_key,
 					  &array_magic_value, 0);
 		if (CHECK_FAIL(err))
 			goto done;

 		/* 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);
 		if (CHECK_FAIL(err))
 			goto done;
 		err = clock_gettime(CLOCK_BOOTTIME, &boot_time_ts);
 		if (CHECK_FAIL(err))
 			goto done;
 		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) ||
 			  (env.jit_enabled && !prog_infos[i].jited_prog_len) ||
 			  (env.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),
 			  env.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);
 		if (CHECK_FAIL(err))
 			goto done;

 		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]);
 }
	// 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 (CHECK_FAIL(err))
	continue;

	/* Insert a magic value to the map */
	map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id");
	if (CHECK_FAIL(map_fds[i] < 0))
	goto done;
	err = bpf_map_update_elem(map_fds[i], &array_key,
	&array_magic_value, 0);
	if (CHECK_FAIL(err))
	goto done;

	/* 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);
	if (CHECK_FAIL(err))
	goto done;
	err = clock_gettime(CLOCK_BOOTTIME, &boot_time_ts);
	if (CHECK_FAIL(err))
	goto done;
	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) \|\|
	(env.jit_enabled && !prog_infos[i].jited_prog_len) \|\|
	(env.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),
	env.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);
	if (CHECK_FAIL(err))
	goto done;

	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]);
	}