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