Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <assert.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <sys/resource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <bpf/libbpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <bpf/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include "trace_helpers.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) int main(int ac, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	char filename[256], symbol[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	struct bpf_object *obj = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	struct bpf_link *links[20];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	long key, next_key, value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	struct bpf_program *prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	int map_fd, i, j = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	const char *section;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	struct ksym *sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		perror("setrlimit(RLIMIT_MEMLOCK)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (load_kallsyms()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		printf("failed to process /proc/kallsyms\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		return 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	obj = bpf_object__open_file(filename, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	if (libbpf_get_error(obj)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		fprintf(stderr, "ERROR: opening BPF object file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		obj = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	/* load BPF program */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	if (bpf_object__load(obj)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		fprintf(stderr, "ERROR: loading BPF object file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	if (map_fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	bpf_object__for_each_program(prog, obj) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		section = bpf_program__section_name(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		if (sscanf(section, "kprobe/%s", symbol) != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		/* Attach prog only when symbol exists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		if (ksym_get_addr(symbol)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 			links[j] = bpf_program__attach(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 			if (libbpf_get_error(links[j])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 				fprintf(stderr, "bpf_program__attach failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 				links[j] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 				goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 			j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	for (i = 0; i < 5; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		key = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 		printf("kprobing funcs:");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 			bpf_map_lookup_elem(map_fd, &next_key, &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 			assert(next_key == value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 			sym = ksym_search(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 			key = next_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 			if (!sym) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 				printf("ksym not found. Is kallsyms loaded?\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 			printf(" %s", sym->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 		if (key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 			printf("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 		key = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 		while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 			bpf_map_delete_elem(map_fd, &next_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 		sleep(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) 	for (j--; j >= 0; j--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) 		bpf_link__destroy(links[j]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) 	bpf_object__close(obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }