42 lines
884 B
C
42 lines
884 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (c) 2019 Facebook
|
|
|
|
#include <linux/ptrace.h>
|
|
#include <linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_ARRAY);
|
|
__type(key, int);
|
|
__type(value, int);
|
|
__uint(max_entries, 1);
|
|
} my_pid_map SEC(".maps");
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
|
|
__type(key, int);
|
|
__type(value, int);
|
|
} perf_buf_map SEC(".maps");
|
|
|
|
SEC("tp/raw_syscalls/sys_enter")
|
|
int handle_sys_enter(void *ctx)
|
|
{
|
|
int zero = 0, *my_pid, cur_pid;
|
|
int cpu = bpf_get_smp_processor_id();
|
|
|
|
my_pid = bpf_map_lookup_elem(&my_pid_map, &zero);
|
|
if (!my_pid)
|
|
return 1;
|
|
|
|
cur_pid = bpf_get_current_pid_tgid() >> 32;
|
|
if (cur_pid != *my_pid)
|
|
return 1;
|
|
|
|
bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU,
|
|
&cpu, sizeof(cpu));
|
|
return 1;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|