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