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 14 int 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 38 int 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 62 int 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 99 int 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 } 107 108 int 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 } 116 117 int 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 */ 130 131 EXPORT_SYMBOL_GPL(input_event_from_user); 132 EXPORT_SYMBOL_GPL(input_event_to_user); 133 EXPORT_SYMBOL_GPL(input_ff_effect_from_user); 134