1/*
  2 * 32bit compatibility wrappers for the input subsystem.
  3 *
  4 * Very heavily based on evdev.c - Copyright (c) 1999-2002 Vojtech Pavlik
  5 *
  6 * This program is free software; you can redistribute it and/or modify it
  7 * under the terms of the GNU General Public License version 2 as published by
  8 * the Free Software Foundation.
  9 */
 10
 11#include <linux/export.h>
 12#include <asm/uaccess.h>
 13#include "input-compat.h"
 14
 15#ifdef CONFIG_COMPAT
 16
 17int input_event_from_user(const char __user *buffer,
 18			  struct input_event *event)
 19{
 20	if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
 21		struct input_event_compat compat_event;
 22
 23		if (copy_from_user(&compat_event, buffer,
 24				   sizeof(struct input_event_compat)))
 25			return -EFAULT;
 26
 27		event->time.tv_sec = compat_event.time.tv_sec;
 28		event->time.tv_usec = compat_event.time.tv_usec;
 29		event->type = compat_event.type;
 30		event->code = compat_event.code;
 31		event->value = compat_event.value;
 32
 33	} else {
 34		if (copy_from_user(event, buffer, sizeof(struct input_event)))
 35			return -EFAULT;
 36	}
 37
 38	return 0;
 39}
 40
 41int input_event_to_user(char __user *buffer,
 42			const struct input_event *event)
 43{
 44	if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
 45		struct input_event_compat compat_event;
 46
 47		compat_event.time.tv_sec = event->time.tv_sec;
 48		compat_event.time.tv_usec = event->time.tv_usec;
 49		compat_event.type = event->type;
 50		compat_event.code = event->code;
 51		compat_event.value = event->value;
 52
 53		if (copy_to_user(buffer, &compat_event,
 54				 sizeof(struct input_event_compat)))
 55			return -EFAULT;
 56
 57	} else {
 58		if (copy_to_user(buffer, event, sizeof(struct input_event)))
 59			return -EFAULT;
 60	}
 61
 62	return 0;
 63}
 64
 65int input_ff_effect_from_user(const char __user *buffer, size_t size,
 66			      struct ff_effect *effect)
 67{
 68	if (in_compat_syscall()) {
 69		struct ff_effect_compat *compat_effect;
 70
 71		if (size != sizeof(struct ff_effect_compat))
 72			return -EINVAL;
 73
 74		/*
 75		 * It so happens that the pointer which needs to be changed
 76		 * is the last field in the structure, so we can retrieve the
 77		 * whole thing and replace just the pointer.
 78		 */
 79		compat_effect = (struct ff_effect_compat *)effect;
 80
 81		if (copy_from_user(compat_effect, buffer,
 82				   sizeof(struct ff_effect_compat)))
 83			return -EFAULT;
 84
 85		if (compat_effect->type == FF_PERIODIC &&
 86		    compat_effect->u.periodic.waveform == FF_CUSTOM)
 87			effect->u.periodic.custom_data =
 88				compat_ptr(compat_effect->u.periodic.custom_data);
 89	} else {
 90		if (size != sizeof(struct ff_effect))
 91			return -EINVAL;
 92
 93		if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
 94			return -EFAULT;
 95	}
 96
 97	return 0;
 98}
 99
100#else
101
102int input_event_from_user(const char __user *buffer,
103			 struct input_event *event)
104{
105	if (copy_from_user(event, buffer, sizeof(struct input_event)))
106		return -EFAULT;
107
108	return 0;
109}
110
111int input_event_to_user(char __user *buffer,
112			const struct input_event *event)
113{
114	if (copy_to_user(buffer, event, sizeof(struct input_event)))
115		return -EFAULT;
116
117	return 0;
118}
119
120int input_ff_effect_from_user(const char __user *buffer, size_t size,
121			      struct ff_effect *effect)
122{
123	if (size != sizeof(struct ff_effect))
124		return -EINVAL;
125
126	if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
127		return -EFAULT;
128
129	return 0;
130}
131
132#endif /* CONFIG_COMPAT */
133
134EXPORT_SYMBOL_GPL(input_event_from_user);
135EXPORT_SYMBOL_GPL(input_event_to_user);
136EXPORT_SYMBOL_GPL(input_ff_effect_from_user);

  1/*
  2 * 32bit compatibility wrappers for the input subsystem.
  3 *
  4 * Very heavily based on evdev.c - Copyright (c) 1999-2002 Vojtech Pavlik
  5 *
  6 * This program is free software; you can redistribute it and/or modify it
  7 * under the terms of the GNU General Public License version 2 as published by
  8 * the Free Software Foundation.
  9 */
 10
 11#include <linux/export.h>
 12#include <asm/uaccess.h>
 13#include "input-compat.h"
 14
 15#ifdef CONFIG_COMPAT
 16
 17int input_event_from_user(const char __user *buffer,
 18			  struct input_event *event)
 19{
 20	if (INPUT_COMPAT_TEST && !COMPAT_USE_64BIT_TIME) {
 21		struct input_event_compat compat_event;
 22
 23		if (copy_from_user(&compat_event, buffer,
 24				   sizeof(struct input_event_compat)))
 25			return -EFAULT;
 26
 27		event->time.tv_sec = compat_event.time.tv_sec;
 28		event->time.tv_usec = compat_event.time.tv_usec;
 29		event->type = compat_event.type;
 30		event->code = compat_event.code;
 31		event->value = compat_event.value;
 32
 33	} else {
 34		if (copy_from_user(event, buffer, sizeof(struct input_event)))
 35			return -EFAULT;
 36	}
 37
 38	return 0;
 39}
 40
 41int input_event_to_user(char __user *buffer,
 42			const struct input_event *event)
 43{
 44	if (INPUT_COMPAT_TEST && !COMPAT_USE_64BIT_TIME) {
 45		struct input_event_compat compat_event;
 46
 47		compat_event.time.tv_sec = event->time.tv_sec;
 48		compat_event.time.tv_usec = event->time.tv_usec;
 49		compat_event.type = event->type;
 50		compat_event.code = event->code;
 51		compat_event.value = event->value;
 52
 53		if (copy_to_user(buffer, &compat_event,
 54				 sizeof(struct input_event_compat)))
 55			return -EFAULT;
 56
 57	} else {
 58		if (copy_to_user(buffer, event, sizeof(struct input_event)))
 59			return -EFAULT;
 60	}
 61
 62	return 0;
 63}
 64
 65int input_ff_effect_from_user(const char __user *buffer, size_t size,
 66			      struct ff_effect *effect)
 67{
 68	if (INPUT_COMPAT_TEST) {
 69		struct ff_effect_compat *compat_effect;
 70
 71		if (size != sizeof(struct ff_effect_compat))
 72			return -EINVAL;
 73
 74		/*
 75		 * It so happens that the pointer which needs to be changed
 76		 * is the last field in the structure, so we can retrieve the
 77		 * whole thing and replace just the pointer.
 78		 */
 79		compat_effect = (struct ff_effect_compat *)effect;
 80
 81		if (copy_from_user(compat_effect, buffer,
 82				   sizeof(struct ff_effect_compat)))
 83			return -EFAULT;
 84
 85		if (compat_effect->type == FF_PERIODIC &&
 86		    compat_effect->u.periodic.waveform == FF_CUSTOM)
 87			effect->u.periodic.custom_data =
 88				compat_ptr(compat_effect->u.periodic.custom_data);
 89	} else {
 90		if (size != sizeof(struct ff_effect))
 91			return -EINVAL;
 92
 93		if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
 94			return -EFAULT;
 95	}
 96
 97	return 0;
 98}
 99
100#else
101
102int input_event_from_user(const char __user *buffer,
103			 struct input_event *event)
104{
105	if (copy_from_user(event, buffer, sizeof(struct input_event)))
106		return -EFAULT;
107
108	return 0;
109}
110
111int input_event_to_user(char __user *buffer,
112			const struct input_event *event)
113{
114	if (copy_to_user(buffer, event, sizeof(struct input_event)))
115		return -EFAULT;
116
117	return 0;
118}
119
120int input_ff_effect_from_user(const char __user *buffer, size_t size,
121			      struct ff_effect *effect)
122{
123	if (size != sizeof(struct ff_effect))
124		return -EINVAL;
125
126	if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
127		return -EFAULT;
128
129	return 0;
130}
131
132#endif /* CONFIG_COMPAT */
133
134EXPORT_SYMBOL_GPL(input_event_from_user);
135EXPORT_SYMBOL_GPL(input_event_to_user);
136EXPORT_SYMBOL_GPL(input_ff_effect_from_user);