1#include <stdio.h>
 2#include <linux/bpf.h>
 3#include <unistd.h>
 4#include <linux/filter.h>
 5#include <linux/seccomp.h>
 6#include <sys/prctl.h>
 7#include "libbpf.h"
 8#include "bpf_load.h"
 9#include <sys/resource.h>
10
11/* install fake seccomp program to enable seccomp code path inside the kernel,
12 * so that our kprobe attached to seccomp_phase1() can be triggered
13 */
14static void install_accept_all_seccomp(void)
15{
16	struct sock_filter filter[] = {
17		BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
18	};
19	struct sock_fprog prog = {
20		.len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
21		.filter = filter,
22	};
23	if (prctl(PR_SET_SECCOMP, 2, &prog))
24		perror("prctl");
25}
26
27int main(int ac, char **argv)
28{
29	FILE *f;
30	char filename[256];
31	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
32
33	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
34	setrlimit(RLIMIT_MEMLOCK, &r);
35
36	if (load_bpf_file(filename)) {
37		printf("%s", bpf_log_buf);
38		return 1;
39	}
40
41	install_accept_all_seccomp();
42
43	f = popen("dd if=/dev/zero of=/dev/null count=5", "r");
44	(void) f;
45
46	read_trace_pipe();
47
48	return 0;
49}