tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 __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
44enum {
45 SNDRV_HWDEP_IOCTL_DSP_LOAD32 = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
46};
47
48static 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}