1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2017 Facebook
3
4#include "vmlinux.h"
5#include <bpf/bpf_helpers.h>
6#include <bpf/bpf_tracing.h>
7#include <bpf/bpf_core_read.h>
8#include "bpf_misc.h"
9
10int kprobe2_res = 0;
11int kretprobe2_res = 0;
12int uprobe_byname_res = 0;
13int uretprobe_byname_res = 0;
14int uprobe_byname2_res = 0;
15int uretprobe_byname2_res = 0;
16int uprobe_byname3_sleepable_res = 0;
17int uprobe_byname3_res = 0;
18int uretprobe_byname3_sleepable_res = 0;
19int uretprobe_byname3_res = 0;
20void *user_ptr = 0;
21
22SEC("ksyscall/nanosleep")
23int BPF_KSYSCALL(handle_kprobe_auto, struct __kernel_timespec *req, struct __kernel_timespec *rem)
24{
25 kprobe2_res = 11;
26 return 0;
27}
28
29SEC("kretsyscall/nanosleep")
30int BPF_KRETPROBE(handle_kretprobe_auto, int ret)
31{
32 kretprobe2_res = 22;
33 return ret;
34}
35
36SEC("uprobe")
37int handle_uprobe_ref_ctr(struct pt_regs *ctx)
38{
39 return 0;
40}
41
42SEC("uretprobe")
43int handle_uretprobe_ref_ctr(struct pt_regs *ctx)
44{
45 return 0;
46}
47
48SEC("uprobe")
49int handle_uprobe_byname(struct pt_regs *ctx)
50{
51 uprobe_byname_res = 5;
52 return 0;
53}
54
55/* use auto-attach format for section definition. */
56SEC("uretprobe//proc/self/exe:trigger_func2")
57int handle_uretprobe_byname(struct pt_regs *ctx)
58{
59 uretprobe_byname_res = 6;
60 return 0;
61}
62
63SEC("uprobe")
64int BPF_UPROBE(handle_uprobe_byname2, const char *pathname, const char *mode)
65{
66 char mode_buf[2] = {};
67
68 /* verify fopen mode */
69 bpf_probe_read_user(mode_buf, sizeof(mode_buf), mode);
70 if (mode_buf[0] == 'r' && mode_buf[1] == 0)
71 uprobe_byname2_res = 7;
72 return 0;
73}
74
75SEC("uretprobe")
76int BPF_URETPROBE(handle_uretprobe_byname2, void *ret)
77{
78 uretprobe_byname2_res = 8;
79 return 0;
80}
81
82static __always_inline bool verify_sleepable_user_copy(void)
83{
84 char data[9];
85
86 bpf_copy_from_user(data, sizeof(data), user_ptr);
87 return bpf_strncmp(data, sizeof(data), "test_data") == 0;
88}
89
90SEC("uprobe.s//proc/self/exe:trigger_func3")
91int handle_uprobe_byname3_sleepable(struct pt_regs *ctx)
92{
93 if (verify_sleepable_user_copy())
94 uprobe_byname3_sleepable_res = 9;
95 return 0;
96}
97
98/**
99 * same target as the uprobe.s above to force sleepable and non-sleepable
100 * programs in the same bpf_prog_array
101 */
102SEC("uprobe//proc/self/exe:trigger_func3")
103int handle_uprobe_byname3(struct pt_regs *ctx)
104{
105 uprobe_byname3_res = 10;
106 return 0;
107}
108
109SEC("uretprobe.s//proc/self/exe:trigger_func3")
110int handle_uretprobe_byname3_sleepable(struct pt_regs *ctx)
111{
112 if (verify_sleepable_user_copy())
113 uretprobe_byname3_sleepable_res = 11;
114 return 0;
115}
116
117SEC("uretprobe//proc/self/exe:trigger_func3")
118int handle_uretprobe_byname3(struct pt_regs *ctx)
119{
120 uretprobe_byname3_res = 12;
121 return 0;
122}
123
124
125char _license[] SEC("license") = "GPL";
126

source code of linux/tools/testing/selftests/bpf/progs/test_attach_probe.c