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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timer_compat.c (3615B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *   32bit -> 64bit ioctl wrapper for timer API
      4 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
      5 */
      6
      7/* This file included from timer.c */
      8
      9#include <linux/compat.h>
     10
     11/*
     12 * ILP32/LP64 has different size for 'long' type. Additionally, the size
     13 * of storage alignment differs depending on architectures. Here, '__packed'
     14 * qualifier is used so that the size of this structure is multiple of 4 and
     15 * it fits to any architectures with 32 bit storage alignment.
     16 */
     17struct snd_timer_gparams32 {
     18	struct snd_timer_id tid;
     19	u32 period_num;
     20	u32 period_den;
     21	unsigned char reserved[32];
     22} __packed;
     23
     24struct snd_timer_info32 {
     25	u32 flags;
     26	s32 card;
     27	unsigned char id[64];
     28	unsigned char name[80];
     29	u32 reserved0;
     30	u32 resolution;
     31	unsigned char reserved[64];
     32};
     33
     34static int snd_timer_user_gparams_compat(struct file *file,
     35					struct snd_timer_gparams32 __user *user)
     36{
     37	struct snd_timer_gparams gparams;
     38
     39	if (copy_from_user(&gparams.tid, &user->tid, sizeof(gparams.tid)) ||
     40	    get_user(gparams.period_num, &user->period_num) ||
     41	    get_user(gparams.period_den, &user->period_den))
     42		return -EFAULT;
     43
     44	return timer_set_gparams(&gparams);
     45}
     46
     47static int snd_timer_user_info_compat(struct file *file,
     48				      struct snd_timer_info32 __user *_info)
     49{
     50	struct snd_timer_user *tu;
     51	struct snd_timer_info32 info;
     52	struct snd_timer *t;
     53
     54	tu = file->private_data;
     55	if (!tu->timeri)
     56		return -EBADFD;
     57	t = tu->timeri->timer;
     58	if (!t)
     59		return -EBADFD;
     60	memset(&info, 0, sizeof(info));
     61	info.card = t->card ? t->card->number : -1;
     62	if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
     63		info.flags |= SNDRV_TIMER_FLG_SLAVE;
     64	strscpy(info.id, t->id, sizeof(info.id));
     65	strscpy(info.name, t->name, sizeof(info.name));
     66	info.resolution = t->hw.resolution;
     67	if (copy_to_user(_info, &info, sizeof(*_info)))
     68		return -EFAULT;
     69	return 0;
     70}
     71
     72enum {
     73	SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
     74	SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
     75	SNDRV_TIMER_IOCTL_STATUS_COMPAT32 = _IOW('T', 0x14, struct snd_timer_status32),
     76	SNDRV_TIMER_IOCTL_STATUS_COMPAT64 = _IOW('T', 0x14, struct snd_timer_status64),
     77};
     78
     79static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
     80					  unsigned long arg)
     81{
     82	void __user *argp = compat_ptr(arg);
     83
     84	switch (cmd) {
     85	case SNDRV_TIMER_IOCTL_PVERSION:
     86	case SNDRV_TIMER_IOCTL_TREAD_OLD:
     87	case SNDRV_TIMER_IOCTL_TREAD64:
     88	case SNDRV_TIMER_IOCTL_GINFO:
     89	case SNDRV_TIMER_IOCTL_GSTATUS:
     90	case SNDRV_TIMER_IOCTL_SELECT:
     91	case SNDRV_TIMER_IOCTL_PARAMS:
     92	case SNDRV_TIMER_IOCTL_START:
     93	case SNDRV_TIMER_IOCTL_START_OLD:
     94	case SNDRV_TIMER_IOCTL_STOP:
     95	case SNDRV_TIMER_IOCTL_STOP_OLD:
     96	case SNDRV_TIMER_IOCTL_CONTINUE:
     97	case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
     98	case SNDRV_TIMER_IOCTL_PAUSE:
     99	case SNDRV_TIMER_IOCTL_PAUSE_OLD:
    100	case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
    101		return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp, true);
    102	case SNDRV_TIMER_IOCTL_GPARAMS32:
    103		return snd_timer_user_gparams_compat(file, argp);
    104	case SNDRV_TIMER_IOCTL_INFO32:
    105		return snd_timer_user_info_compat(file, argp);
    106	case SNDRV_TIMER_IOCTL_STATUS_COMPAT32:
    107		return snd_timer_user_status32(file, argp);
    108	case SNDRV_TIMER_IOCTL_STATUS_COMPAT64:
    109		return snd_timer_user_status64(file, argp);
    110	}
    111	return -ENOIOCTLCMD;
    112}
    113
    114static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
    115					unsigned long arg)
    116{
    117	struct snd_timer_user *tu = file->private_data;
    118	long ret;
    119
    120	mutex_lock(&tu->ioctl_lock);
    121	ret = __snd_timer_user_ioctl_compat(file, cmd, arg);
    122	mutex_unlock(&tu->ioctl_lock);
    123	return ret;
    124}