sound/core/hwdep_compat.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   32bit -> 64bit ioctl wrapper for hwdep API
   4  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5  */
   6
   7 /* This file is included from hwdep.c */
   8
   9 #include <linux/compat.h>
  10
  11 struct snd_hwdep_dsp_image32 {
  12         u32 index;
  13         unsigned char name[64];
  14         u32 image;      /* pointer */
  15         u32 length;
  16         u32 driver_data;
  17 } /* don't set packed attribute here */;
  18
  19 static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
  20                                      struct snd_hwdep_dsp_image32 __user *src)
  21 {
  22         struct snd_hwdep_dsp_image __user *dst;
  23         compat_caddr_t ptr;
  24         u32 val;
  25
  26         dst = compat_alloc_user_space(sizeof(*dst));
  27
  28         /* index and name */
  29         if (copy_in_user(dst, src, 4 + 64))
  30                 return -EFAULT;
  31         if (get_user(ptr, &src->image) ||
  32             put_user(compat_ptr(ptr), &dst->image))
  33                 return -EFAULT;
  34         if (get_user(val, &src->length) ||
  35             put_user(val, &dst->length))
  36                 return -EFAULT;
  37         if (get_user(val, &src->driver_data) ||
  38             put_user(val, &dst->driver_data))
  39                 return -EFAULT;
  40
  41         return snd_hwdep_dsp_load(hw, dst);
  42 }
  43
  44 enum {
  45         SNDRV_HWDEP_IOCTL_DSP_LOAD32   = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
  46 };
  47
  48 static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
  49                                    unsigned long arg)
  50 {
  51         struct snd_hwdep *hw = file->private_data;
  52         void __user *argp = compat_ptr(arg);
  53         switch (cmd) {
  54         case SNDRV_HWDEP_IOCTL_PVERSION:
  55         case SNDRV_HWDEP_IOCTL_INFO:
  56         case SNDRV_HWDEP_IOCTL_DSP_STATUS:
  57                 return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
  58         case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
  59                 return snd_hwdep_dsp_load_compat(hw, argp);
  60         }
  61         if (hw->ops.ioctl_compat)
  62                 return hw->ops.ioctl_compat(hw, file, cmd, arg);
  63         return -ENOIOCTLCMD;
  64 }