1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2024. Huawei Technologies Co., Ltd */
3#include <linux/types.h>
4#include <bpf/bpf_helpers.h>
5
6#include "bpf_misc.h"
7
8int target_pid = 0;
9void *user_ptr = 0;
10int read_ret[8];
11
12char _license[] SEC("license") = "GPL";
13
14SEC("fentry/" SYS_PREFIX "sys_nanosleep")
15int do_probe_read(void *ctx)
16{
17	char buf[8];
18
19	if ((bpf_get_current_pid_tgid() >> 32) != target_pid)
20		return 0;
21
22	read_ret[0] = bpf_probe_read_kernel(buf, sizeof(buf), user_ptr);
23	read_ret[1] = bpf_probe_read_kernel_str(buf, sizeof(buf), user_ptr);
24	read_ret[2] = bpf_probe_read(buf, sizeof(buf), user_ptr);
25	read_ret[3] = bpf_probe_read_str(buf, sizeof(buf), user_ptr);
26	read_ret[4] = bpf_probe_read_user(buf, sizeof(buf), user_ptr);
27	read_ret[5] = bpf_probe_read_user_str(buf, sizeof(buf), user_ptr);
28
29	return 0;
30}
31
32SEC("fentry.s/" SYS_PREFIX "sys_nanosleep")
33int do_copy_from_user(void *ctx)
34{
35	char buf[8];
36
37	if ((bpf_get_current_pid_tgid() >> 32) != target_pid)
38		return 0;
39
40	read_ret[6] = bpf_copy_from_user(buf, sizeof(buf), user_ptr);
41	read_ret[7] = bpf_copy_from_user_task(buf, sizeof(buf), user_ptr,
42					      bpf_get_current_task_btf(), 0);
43
44	return 0;
45}
46