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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
3#include <linux/bpf.h>
4#include <unistd.h>
5#include <linux/filter.h>
6#include <linux/seccomp.h>
7#include <sys/prctl.h>
8#include <bpf/bpf.h>
9#include "bpf_load.h"
10#include <sys/resource.h>
11
12/* install fake seccomp program to enable seccomp code path inside the kernel,
13 * so that our kprobe attached to seccomp_phase1() can be triggered
14 */
15static void install_accept_all_seccomp(void)
16{
17 struct sock_filter filter[] = {
18 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
19 };
20 struct sock_fprog prog = {
21 .len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
22 .filter = filter,
23 };
24 if (prctl(PR_SET_SECCOMP, 2, &prog))
25 perror("prctl");
26}
27
28int main(int ac, char **argv)
29{
30 FILE *f;
31 char filename[256];
32 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
33
34 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
35 setrlimit(RLIMIT_MEMLOCK, &r);
36
37 if (load_bpf_file(filename)) {
38 printf("%s", bpf_log_buf);
39 return 1;
40 }
41
42 install_accept_all_seccomp();
43
44 f = popen("dd if=/dev/zero of=/dev/null count=5", "r");
45 (void) f;
46
47 read_trace_pipe();
48
49 return 0;
50}