tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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