cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

tracex4_user.c (2062B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
      3 */
      4#include <stdio.h>
      5#include <stdlib.h>
      6#include <signal.h>
      7#include <unistd.h>
      8#include <stdbool.h>
      9#include <string.h>
     10#include <time.h>
     11
     12#include <bpf/bpf.h>
     13#include <bpf/libbpf.h>
     14
     15struct pair {
     16	long long val;
     17	__u64 ip;
     18};
     19
     20static __u64 time_get_ns(void)
     21{
     22	struct timespec ts;
     23
     24	clock_gettime(CLOCK_MONOTONIC, &ts);
     25	return ts.tv_sec * 1000000000ull + ts.tv_nsec;
     26}
     27
     28static void print_old_objects(int fd)
     29{
     30	long long val = time_get_ns();
     31	__u64 key, next_key;
     32	struct pair v;
     33
     34	key = write(1, "\e[1;1H\e[2J", 11); /* clear screen */
     35
     36	key = -1;
     37	while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
     38		bpf_map_lookup_elem(fd, &next_key, &v);
     39		key = next_key;
     40		if (val - v.val < 1000000000ll)
     41			/* object was allocated more then 1 sec ago */
     42			continue;
     43		printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n",
     44		       next_key, (val - v.val) / 1000000000ll, v.ip);
     45	}
     46}
     47
     48int main(int ac, char **argv)
     49{
     50	struct bpf_link *links[2];
     51	struct bpf_program *prog;
     52	struct bpf_object *obj;
     53	char filename[256];
     54	int map_fd, i, j = 0;
     55
     56	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
     57	obj = bpf_object__open_file(filename, NULL);
     58	if (libbpf_get_error(obj)) {
     59		fprintf(stderr, "ERROR: opening BPF object file failed\n");
     60		return 0;
     61	}
     62
     63	/* load BPF program */
     64	if (bpf_object__load(obj)) {
     65		fprintf(stderr, "ERROR: loading BPF object file failed\n");
     66		goto cleanup;
     67	}
     68
     69	map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
     70	if (map_fd < 0) {
     71		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
     72		goto cleanup;
     73	}
     74
     75	bpf_object__for_each_program(prog, obj) {
     76		links[j] = bpf_program__attach(prog);
     77		if (libbpf_get_error(links[j])) {
     78			fprintf(stderr, "ERROR: bpf_program__attach failed\n");
     79			links[j] = NULL;
     80			goto cleanup;
     81		}
     82		j++;
     83	}
     84
     85	for (i = 0; ; i++) {
     86		print_old_objects(map_fd);
     87		sleep(1);
     88	}
     89
     90cleanup:
     91	for (j--; j >= 0; j--)
     92		bpf_link__destroy(links[j]);
     93
     94	bpf_object__close(obj);
     95	return 0;
     96}