50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
#include <stdio.h>
|
|
#include <linux/bpf.h>
|
|
#include <unistd.h>
|
|
#include <linux/filter.h>
|
|
#include <linux/seccomp.h>
|
|
#include <sys/prctl.h>
|
|
#include "libbpf.h"
|
|
#include "bpf_load.h"
|
|
#include <sys/resource.h>
|
|
|
|
/* install fake seccomp program to enable seccomp code path inside the kernel,
|
|
* so that our kprobe attached to seccomp_phase1() can be triggered
|
|
*/
|
|
static void install_accept_all_seccomp(void)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
|
|
.filter = filter,
|
|
};
|
|
if (prctl(PR_SET_SECCOMP, 2, &prog))
|
|
perror("prctl");
|
|
}
|
|
|
|
int main(int ac, char **argv)
|
|
{
|
|
FILE *f;
|
|
char filename[256];
|
|
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
setrlimit(RLIMIT_MEMLOCK, &r);
|
|
|
|
if (load_bpf_file(filename)) {
|
|
printf("%s", bpf_log_buf);
|
|
return 1;
|
|
}
|
|
|
|
install_accept_all_seccomp();
|
|
|
|
f = popen("dd if=/dev/zero of=/dev/null count=5", "r");
|
|
(void) f;
|
|
|
|
read_trace_pipe();
|
|
|
|
return 0;
|
|
}
|