test_uprobe.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2023 Hengqi Chen */
 3
 4#include "vmlinux.h"
 5#include <bpf/bpf_helpers.h>
 6#include <bpf/bpf_tracing.h>
 7
 8pid_t my_pid = 0;
 9
10int test1_result = 0;
11int test2_result = 0;
12int test3_result = 0;
13int test4_result = 0;
14
15SEC("uprobe/./liburandom_read.so:urandlib_api_sameoffset")
16int BPF_UPROBE(test1)
17{
18	pid_t pid = bpf_get_current_pid_tgid() >> 32;
19
20	if (pid != my_pid)
21		return 0;
22
23	test1_result = 1;
24	return 0;
25}
26
27SEC("uprobe/./liburandom_read.so:urandlib_api_sameoffset@LIBURANDOM_READ_1.0.0")
28int BPF_UPROBE(test2)
29{
30	pid_t pid = bpf_get_current_pid_tgid() >> 32;
31
32	if (pid != my_pid)
33		return 0;
34
35	test2_result = 1;
36	return 0;
37}
38
39SEC("uretprobe/./liburandom_read.so:urandlib_api_sameoffset@@LIBURANDOM_READ_2.0.0")
40int BPF_URETPROBE(test3, int ret)
41{
42	pid_t pid = bpf_get_current_pid_tgid() >> 32;
43
44	if (pid != my_pid)
45		return 0;
46
47	test3_result = ret;
48	return 0;
49}
50
51SEC("uprobe")
52int BPF_UPROBE(test4)
53{
54	pid_t pid = bpf_get_current_pid_tgid() >> 32;
55
56	if (pid != my_pid)
57		return 0;
58
59	test4_result = 1;
60	return 0;
61}
62
63#if defined(__TARGET_ARCH_x86)
64struct pt_regs regs;
65
66SEC("uprobe")
67int BPF_UPROBE(test_regs_change)
68{
69	pid_t pid = bpf_get_current_pid_tgid() >> 32;
70
71	if (pid != my_pid)
72		return 0;
73
74	ctx->ax  = regs.ax;
75	ctx->cx  = regs.cx;
76	ctx->dx  = regs.dx;
77	ctx->r8  = regs.r8;
78	ctx->r9  = regs.r9;
79	ctx->r10 = regs.r10;
80	ctx->r11 = regs.r11;
81	ctx->di  = regs.di;
82	ctx->si  = regs.si;
83	return 0;
84}
85
86unsigned long ip;
87
88SEC("uprobe")
89int BPF_UPROBE(test_regs_change_ip)
90{
91	pid_t pid = bpf_get_current_pid_tgid() >> 32;
92
93	if (pid != my_pid)
94		return 0;
95
96	ctx->ip = ip;
97	return 0;
98}
99#endif