1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * 32bit compatibility wrappers for the input subsystem.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Very heavily based on evdev.c - Copyright (c) 1999-2002 Vojtech Pavlik
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/export.h>
9*4882a593Smuzhiyun #include <linux/uaccess.h>
10*4882a593Smuzhiyun #include "input-compat.h"
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #ifdef CONFIG_COMPAT
13*4882a593Smuzhiyun
input_event_from_user(const char __user * buffer,struct input_event * event)14*4882a593Smuzhiyun int input_event_from_user(const char __user *buffer,
15*4882a593Smuzhiyun struct input_event *event)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
18*4882a593Smuzhiyun struct input_event_compat compat_event;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun if (copy_from_user(&compat_event, buffer,
21*4882a593Smuzhiyun sizeof(struct input_event_compat)))
22*4882a593Smuzhiyun return -EFAULT;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun event->input_event_sec = compat_event.sec;
25*4882a593Smuzhiyun event->input_event_usec = compat_event.usec;
26*4882a593Smuzhiyun event->type = compat_event.type;
27*4882a593Smuzhiyun event->code = compat_event.code;
28*4882a593Smuzhiyun event->value = compat_event.value;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun } else {
31*4882a593Smuzhiyun if (copy_from_user(event, buffer, sizeof(struct input_event)))
32*4882a593Smuzhiyun return -EFAULT;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return 0;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
input_event_to_user(char __user * buffer,const struct input_event * event)38*4882a593Smuzhiyun int input_event_to_user(char __user *buffer,
39*4882a593Smuzhiyun const struct input_event *event)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
42*4882a593Smuzhiyun struct input_event_compat compat_event;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun compat_event.sec = event->input_event_sec;
45*4882a593Smuzhiyun compat_event.usec = event->input_event_usec;
46*4882a593Smuzhiyun compat_event.type = event->type;
47*4882a593Smuzhiyun compat_event.code = event->code;
48*4882a593Smuzhiyun compat_event.value = event->value;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun if (copy_to_user(buffer, &compat_event,
51*4882a593Smuzhiyun sizeof(struct input_event_compat)))
52*4882a593Smuzhiyun return -EFAULT;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun } else {
55*4882a593Smuzhiyun if (copy_to_user(buffer, event, sizeof(struct input_event)))
56*4882a593Smuzhiyun return -EFAULT;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun return 0;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
input_ff_effect_from_user(const char __user * buffer,size_t size,struct ff_effect * effect)62*4882a593Smuzhiyun int input_ff_effect_from_user(const char __user *buffer, size_t size,
63*4882a593Smuzhiyun struct ff_effect *effect)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun if (in_compat_syscall()) {
66*4882a593Smuzhiyun struct ff_effect_compat *compat_effect;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun if (size != sizeof(struct ff_effect_compat))
69*4882a593Smuzhiyun return -EINVAL;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun /*
72*4882a593Smuzhiyun * It so happens that the pointer which needs to be changed
73*4882a593Smuzhiyun * is the last field in the structure, so we can retrieve the
74*4882a593Smuzhiyun * whole thing and replace just the pointer.
75*4882a593Smuzhiyun */
76*4882a593Smuzhiyun compat_effect = (struct ff_effect_compat *)effect;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun if (copy_from_user(compat_effect, buffer,
79*4882a593Smuzhiyun sizeof(struct ff_effect_compat)))
80*4882a593Smuzhiyun return -EFAULT;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun if (compat_effect->type == FF_PERIODIC &&
83*4882a593Smuzhiyun compat_effect->u.periodic.waveform == FF_CUSTOM)
84*4882a593Smuzhiyun effect->u.periodic.custom_data =
85*4882a593Smuzhiyun compat_ptr(compat_effect->u.periodic.custom_data);
86*4882a593Smuzhiyun } else {
87*4882a593Smuzhiyun if (size != sizeof(struct ff_effect))
88*4882a593Smuzhiyun return -EINVAL;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
91*4882a593Smuzhiyun return -EFAULT;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun return 0;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun #else
98*4882a593Smuzhiyun
input_event_from_user(const char __user * buffer,struct input_event * event)99*4882a593Smuzhiyun int input_event_from_user(const char __user *buffer,
100*4882a593Smuzhiyun struct input_event *event)
101*4882a593Smuzhiyun {
102*4882a593Smuzhiyun if (copy_from_user(event, buffer, sizeof(struct input_event)))
103*4882a593Smuzhiyun return -EFAULT;
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun return 0;
106*4882a593Smuzhiyun }
107*4882a593Smuzhiyun
input_event_to_user(char __user * buffer,const struct input_event * event)108*4882a593Smuzhiyun int input_event_to_user(char __user *buffer,
109*4882a593Smuzhiyun const struct input_event *event)
110*4882a593Smuzhiyun {
111*4882a593Smuzhiyun if (copy_to_user(buffer, event, sizeof(struct input_event)))
112*4882a593Smuzhiyun return -EFAULT;
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun return 0;
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun
input_ff_effect_from_user(const char __user * buffer,size_t size,struct ff_effect * effect)117*4882a593Smuzhiyun int input_ff_effect_from_user(const char __user *buffer, size_t size,
118*4882a593Smuzhiyun struct ff_effect *effect)
119*4882a593Smuzhiyun {
120*4882a593Smuzhiyun if (size != sizeof(struct ff_effect))
121*4882a593Smuzhiyun return -EINVAL;
122*4882a593Smuzhiyun
123*4882a593Smuzhiyun if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
124*4882a593Smuzhiyun return -EFAULT;
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun return 0;
127*4882a593Smuzhiyun }
128*4882a593Smuzhiyun
129*4882a593Smuzhiyun #endif /* CONFIG_COMPAT */
130*4882a593Smuzhiyun
131*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(input_event_from_user);
132*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(input_event_to_user);
133*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(input_ff_effect_from_user);
134