1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * 32bit -> 64bit ioctl wrapper for raw MIDI API
4 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
5 */
6
7 /* This file included from rawmidi.c */
8
9 #include <linux/compat.h>
10
11 struct snd_rawmidi_params32 {
12 s32 stream;
13 u32 buffer_size;
14 u32 avail_min;
15 unsigned int no_active_sensing; /* avoid bit-field */
16 unsigned int mode;
17 unsigned char reserved[12];
18 } __attribute__((packed));
19
snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file * rfile,struct snd_rawmidi_params32 __user * src)20 static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
21 struct snd_rawmidi_params32 __user *src)
22 {
23 struct snd_rawmidi_params params;
24 unsigned int val;
25
26 if (get_user(params.stream, &src->stream) ||
27 get_user(params.buffer_size, &src->buffer_size) ||
28 get_user(params.avail_min, &src->avail_min) ||
29 get_user(params.mode, &src->mode) ||
30 get_user(val, &src->no_active_sensing))
31 return -EFAULT;
32 params.no_active_sensing = val;
33 switch (params.stream) {
34 case SNDRV_RAWMIDI_STREAM_OUTPUT:
35 if (!rfile->output)
36 return -EINVAL;
37 return snd_rawmidi_output_params(rfile->output, ¶ms);
38 case SNDRV_RAWMIDI_STREAM_INPUT:
39 if (!rfile->input)
40 return -EINVAL;
41 return snd_rawmidi_input_params(rfile->input, ¶ms);
42 }
43 return -EINVAL;
44 }
45
46 struct compat_snd_rawmidi_status64 {
47 s32 stream;
48 u8 rsvd[4]; /* alignment */
49 s64 tstamp_sec;
50 s64 tstamp_nsec;
51 u32 avail;
52 u32 xruns;
53 unsigned char reserved[16];
54 } __attribute__((packed));
55
snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file * rfile,struct compat_snd_rawmidi_status64 __user * src)56 static int snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file *rfile,
57 struct compat_snd_rawmidi_status64 __user *src)
58 {
59 int err;
60 struct snd_rawmidi_status64 status;
61 struct compat_snd_rawmidi_status64 compat_status;
62
63 if (get_user(status.stream, &src->stream))
64 return -EFAULT;
65
66 switch (status.stream) {
67 case SNDRV_RAWMIDI_STREAM_OUTPUT:
68 if (!rfile->output)
69 return -EINVAL;
70 err = snd_rawmidi_output_status(rfile->output, &status);
71 break;
72 case SNDRV_RAWMIDI_STREAM_INPUT:
73 if (!rfile->input)
74 return -EINVAL;
75 err = snd_rawmidi_input_status(rfile->input, &status);
76 break;
77 default:
78 return -EINVAL;
79 }
80 if (err < 0)
81 return err;
82
83 compat_status = (struct compat_snd_rawmidi_status64) {
84 .stream = status.stream,
85 .tstamp_sec = status.tstamp_sec,
86 .tstamp_nsec = status.tstamp_nsec,
87 .avail = status.avail,
88 .xruns = status.xruns,
89 };
90
91 if (copy_to_user(src, &compat_status, sizeof(*src)))
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_STATUS_COMPAT32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
100 SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64 = _IOWR('W', 0x20, struct compat_snd_rawmidi_status64),
101 };
102
snd_rawmidi_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)103 static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
104 {
105 struct snd_rawmidi_file *rfile;
106 void __user *argp = compat_ptr(arg);
107
108 rfile = file->private_data;
109 switch (cmd) {
110 case SNDRV_RAWMIDI_IOCTL_PVERSION:
111 case SNDRV_RAWMIDI_IOCTL_INFO:
112 case SNDRV_RAWMIDI_IOCTL_DROP:
113 case SNDRV_RAWMIDI_IOCTL_DRAIN:
114 #if IS_ENABLED(CONFIG_SND_UMP)
115 case SNDRV_UMP_IOCTL_ENDPOINT_INFO:
116 case SNDRV_UMP_IOCTL_BLOCK_INFO:
117 #endif
118 return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
119 case SNDRV_RAWMIDI_IOCTL_PARAMS32:
120 return snd_rawmidi_ioctl_params_compat(rfile, argp);
121 case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32:
122 return snd_rawmidi_ioctl_status32(rfile, argp);
123 case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64:
124 return snd_rawmidi_ioctl_status_compat64(rfile, argp);
125 }
126 return -ENOIOCTLCMD;
127 }
128