1 /*
2  *   32bit -> 64bit ioctl wrapper for raw MIDI API
3  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
4  *
5  *   This program is free software; you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  *   GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program; if not, write to the Free Software
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
18  *
19  */
20 
21 /* This file included from rawmidi.c */
22 
23 #include <linux/compat.h>
24 
25 struct snd_rawmidi_params32 {
26 	s32 stream;
27 	u32 buffer_size;
28 	u32 avail_min;
29 	unsigned int no_active_sensing; /* avoid bit-field */
30 	unsigned char reserved[16];
31 } __attribute__((packed));
32 
snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file * rfile,struct snd_rawmidi_params32 __user * src)33 static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
34 					   struct snd_rawmidi_params32 __user *src)
35 {
36 	struct snd_rawmidi_params params;
37 	unsigned int val;
38 
39 	if (rfile->output == NULL)
40 		return -EINVAL;
41 	if (get_user(params.stream, &src->stream) ||
42 	    get_user(params.buffer_size, &src->buffer_size) ||
43 	    get_user(params.avail_min, &src->avail_min) ||
44 	    get_user(val, &src->no_active_sensing))
45 		return -EFAULT;
46 	params.no_active_sensing = val;
47 	switch (params.stream) {
48 	case SNDRV_RAWMIDI_STREAM_OUTPUT:
49 		return snd_rawmidi_output_params(rfile->output, &params);
50 	case SNDRV_RAWMIDI_STREAM_INPUT:
51 		return snd_rawmidi_input_params(rfile->input, &params);
52 	}
53 	return -EINVAL;
54 }
55 
56 struct snd_rawmidi_status32 {
57 	s32 stream;
58 	struct compat_timespec tstamp;
59 	u32 avail;
60 	u32 xruns;
61 	unsigned char reserved[16];
62 } __attribute__((packed));
63 
snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status32 __user * src)64 static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
65 					   struct snd_rawmidi_status32 __user *src)
66 {
67 	int err;
68 	struct snd_rawmidi_status status;
69 
70 	if (rfile->output == NULL)
71 		return -EINVAL;
72 	if (get_user(status.stream, &src->stream))
73 		return -EFAULT;
74 
75 	switch (status.stream) {
76 	case SNDRV_RAWMIDI_STREAM_OUTPUT:
77 		err = snd_rawmidi_output_status(rfile->output, &status);
78 		break;
79 	case SNDRV_RAWMIDI_STREAM_INPUT:
80 		err = snd_rawmidi_input_status(rfile->input, &status);
81 		break;
82 	default:
83 		return -EINVAL;
84 	}
85 	if (err < 0)
86 		return err;
87 
88 	if (put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
89 	    put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
90 	    put_user(status.avail, &src->avail) ||
91 	    put_user(status.xruns, &src->xruns))
92 		return -EFAULT;
93 
94 	return 0;
95 }
96 
97 enum {
98 	SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
99 	SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
100 };
101 
snd_rawmidi_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)102 static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
103 {
104 	struct snd_rawmidi_file *rfile;
105 	void __user *argp = compat_ptr(arg);
106 
107 	rfile = file->private_data;
108 	switch (cmd) {
109 	case SNDRV_RAWMIDI_IOCTL_PVERSION:
110 	case SNDRV_RAWMIDI_IOCTL_INFO:
111 	case SNDRV_RAWMIDI_IOCTL_DROP:
112 	case SNDRV_RAWMIDI_IOCTL_DRAIN:
113 		return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
114 	case SNDRV_RAWMIDI_IOCTL_PARAMS32:
115 		return snd_rawmidi_ioctl_params_compat(rfile, argp);
116 	case SNDRV_RAWMIDI_IOCTL_STATUS32:
117 		return snd_rawmidi_ioctl_status_compat(rfile, argp);
118 	}
119 	return -ENOIOCTLCMD;
120 }
121