cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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input-compat.c (3215B)

      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);