1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2019 Facebook
3
4 #include <linux/ptrace.h>
5 #include <linux/bpf.h>
6 #include <bpf/bpf_helpers.h>
7 #include <bpf/bpf_tracing.h>
8
9 struct {
10 __uint(type, BPF_MAP_TYPE_ARRAY);
11 __type(key, int);
12 __type(value, int);
13 __uint(max_entries, 1);
14 } my_pid_map SEC(".maps");
15
16 struct {
17 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
18 __type(key, int);
19 __type(value, int);
20 } perf_buf_map SEC(".maps");
21
22 SEC("tp/raw_syscalls/sys_enter")
23 int handle_sys_enter(void *ctx)
24 {
25 int zero = 0, *my_pid, cur_pid;
26 int cpu = bpf_get_smp_processor_id();
27
28 my_pid = bpf_map_lookup_elem(&my_pid_map, &zero);
29 if (!my_pid)
30 return 1;
31
32 cur_pid = bpf_get_current_pid_tgid() >> 32;
33 if (cur_pid != *my_pid)
34 return 1;
35
36 bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU,
37 &cpu, sizeof(cpu));
38 return 1;
39 }
40
41 char _license[] SEC("license") = "GPL";
42
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