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Linux/sound/core/hwdep_compat.c

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  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 }
 65 

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