sound/core/timer_compat.c

   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  */
  17 struct 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
  24 struct 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
  34 static 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
  47 static 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
  72 struct snd_timer_status32 {
  73         struct compat_timespec tstamp;
  74         u32 resolution;
  75         u32 lost;
  76         u32 overrun;
  77         u32 queue;
  78         unsigned char reserved[64];
  79 };
  80
  81 static int snd_timer_user_status_compat(struct file *file,
  82                                         struct snd_timer_status32 __user *_status)
  83 {
  84         struct snd_timer_user *tu;
  85         struct snd_timer_status32 status;
  86
  87         tu = file->private_data;
  88         if (!tu->timeri)
  89                 return -EBADFD;
  90         memset(&status, 0, sizeof(status));
  91         status.tstamp.tv_sec = tu->tstamp.tv_sec;
  92         status.tstamp.tv_nsec = tu->tstamp.tv_nsec;
  93         status.resolution = snd_timer_resolution(tu->timeri);
  94         status.lost = tu->timeri->lost;
  95         status.overrun = tu->overrun;
  96         spin_lock_irq(&tu->qlock);
  97         status.queue = tu->qused;
  98         spin_unlock_irq(&tu->qlock);
  99         if (copy_to_user(_status, &status, sizeof(status)))
 100                 return -EFAULT;
 101         return 0;
 102 }
 103
 104 #ifdef CONFIG_X86_X32
 105 /* X32 ABI has the same struct as x86-64 */
 106 #define snd_timer_user_status_x32(file, s) \
 107         snd_timer_user_status(file, s)
 108 #endif /* CONFIG_X86_X32 */
 109
 110 /*
 111  */
 112
 113 enum {
 114         SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
 115         SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
 116         SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct snd_timer_status32),
 117 #ifdef CONFIG_X86_X32
 118         SNDRV_TIMER_IOCTL_STATUS_X32 = _IOW('T', 0x14, struct snd_timer_status),
 119 #endif /* CONFIG_X86_X32 */
 120 };
 121
 122 static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
 123                                           unsigned long arg)
 124 {
 125         void __user *argp = compat_ptr(arg);
 126
 127         switch (cmd) {
 128         case SNDRV_TIMER_IOCTL_PVERSION:
 129         case SNDRV_TIMER_IOCTL_TREAD:
 130         case SNDRV_TIMER_IOCTL_GINFO:
 131         case SNDRV_TIMER_IOCTL_GSTATUS:
 132         case SNDRV_TIMER_IOCTL_SELECT:
 133         case SNDRV_TIMER_IOCTL_PARAMS:
 134         case SNDRV_TIMER_IOCTL_START:
 135         case SNDRV_TIMER_IOCTL_START_OLD:
 136         case SNDRV_TIMER_IOCTL_STOP:
 137         case SNDRV_TIMER_IOCTL_STOP_OLD:
 138         case SNDRV_TIMER_IOCTL_CONTINUE:
 139         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
 140         case SNDRV_TIMER_IOCTL_PAUSE:
 141         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
 142         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
 143                 return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp);
 144         case SNDRV_TIMER_IOCTL_GPARAMS32:
 145                 return snd_timer_user_gparams_compat(file, argp);
 146         case SNDRV_TIMER_IOCTL_INFO32:
 147                 return snd_timer_user_info_compat(file, argp);
 148         case SNDRV_TIMER_IOCTL_STATUS32:
 149                 return snd_timer_user_status_compat(file, argp);
 150 #ifdef CONFIG_X86_X32
 151         case SNDRV_TIMER_IOCTL_STATUS_X32:
 152                 return snd_timer_user_status_x32(file, argp);
 153 #endif /* CONFIG_X86_X32 */
 154         }
 155         return -ENOIOCTLCMD;
 156 }
 157
 158 static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
 159                                         unsigned long arg)
 160 {
 161         struct snd_timer_user *tu = file->private_data;
 162         long ret;
 163
 164         mutex_lock(&tu->ioctl_lock);
 165         ret = __snd_timer_user_ioctl_compat(file, cmd, arg);
 166         mutex_unlock(&tu->ioctl_lock);
 167         return ret;
 168 }