LXR linux/sound/core/timer

   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        strlcpy(info.id, t->id, sizeof(info.id));
  65        strlcpy(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}
 125