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
  11struct 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
  19static 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 info = {};
  23        compat_caddr_t ptr;
  24
  25        if (copy_from_user(&info, src, 4 + 64) ||
  26            get_user(ptr, &src->image) ||
  27            get_user(info.length, &src->length) ||
  28            get_user(info.driver_data, &src->driver_data))
  29                return -EFAULT;
  30        info.image = compat_ptr(ptr);
  31
  32        return snd_hwdep_dsp_load(hw, &info);
  33}
  34
  35enum {
  36        SNDRV_HWDEP_IOCTL_DSP_LOAD32   = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
  37};
  38
  39static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
  40                                   unsigned long arg)
  41{
  42        struct snd_hwdep *hw = file->private_data;
  43        void __user *argp = compat_ptr(arg);
  44        switch (cmd) {
  45        case SNDRV_HWDEP_IOCTL_PVERSION:
  46        case SNDRV_HWDEP_IOCTL_INFO:
  47        case SNDRV_HWDEP_IOCTL_DSP_STATUS:
  48                return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
  49        case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
  50                return snd_hwdep_dsp_load_compat(hw, argp);
  51        }
  52        if (hw->ops.ioctl_compat)
  53                return hw->ops.ioctl_compat(hw, file, cmd, arg);
  54        return -ENOIOCTLCMD;
  55}
  56
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