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 char reserved[16];
17 } __attribute__((packed));
18
snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file * rfile,struct snd_rawmidi_params32 __user * src)19 static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
20 struct snd_rawmidi_params32 __user *src)
21 {
22 struct snd_rawmidi_params params;
23 unsigned int val;
24
25 if (get_user(params.stream, &src->stream) ||
26 get_user(params.buffer_size, &src->buffer_size) ||
27 get_user(params.avail_min, &src->avail_min) ||
28 get_user(val, &src->no_active_sensing))
29 return -EFAULT;
30 params.no_active_sensing = val;
31 switch (params.stream) {
32 case SNDRV_RAWMIDI_STREAM_OUTPUT:
33 if (!rfile->output)
34 return -EINVAL;
35 return snd_rawmidi_output_params(rfile->output, ¶ms);
36 case SNDRV_RAWMIDI_STREAM_INPUT:
37 if (!rfile->input)
38 return -EINVAL;
39 return snd_rawmidi_input_params(rfile->input, ¶ms);
40 }
41 return -EINVAL;
42 }
43
44 struct snd_rawmidi_status32 {
45 s32 stream;
46 struct compat_timespec tstamp;
47 u32 avail;
48 u32 xruns;
49 unsigned char reserved[16];
50 } __attribute__((packed));
51
snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status32 __user * src)52 static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
53 struct snd_rawmidi_status32 __user *src)
54 {
55 int err;
56 struct snd_rawmidi_status status;
57
58 if (get_user(status.stream, &src->stream))
59 return -EFAULT;
60
61 switch (status.stream) {
62 case SNDRV_RAWMIDI_STREAM_OUTPUT:
63 if (!rfile->output)
64 return -EINVAL;
65 err = snd_rawmidi_output_status(rfile->output, &status);
66 break;
67 case SNDRV_RAWMIDI_STREAM_INPUT:
68 if (!rfile->input)
69 return -EINVAL;
70 err = snd_rawmidi_input_status(rfile->input, &status);
71 break;
72 default:
73 return -EINVAL;
74 }
75 if (err < 0)
76 return err;
77
78 if (compat_put_timespec(&status.tstamp, &src->tstamp) ||
79 put_user(status.avail, &src->avail) ||
80 put_user(status.xruns, &src->xruns))
81 return -EFAULT;
82
83 return 0;
84 }
85
86 #ifdef CONFIG_X86_X32
87 /* X32 ABI has 64bit timespec and 64bit alignment */
88 struct snd_rawmidi_status_x32 {
89 s32 stream;
90 u32 rsvd; /* alignment */
91 struct timespec tstamp;
92 u32 avail;
93 u32 xruns;
94 unsigned char reserved[16];
95 } __attribute__((packed));
96
97 #define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
98
snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status_x32 __user * src)99 static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
100 struct snd_rawmidi_status_x32 __user *src)
101 {
102 int err;
103 struct snd_rawmidi_status status;
104
105 if (get_user(status.stream, &src->stream))
106 return -EFAULT;
107
108 switch (status.stream) {
109 case SNDRV_RAWMIDI_STREAM_OUTPUT:
110 if (!rfile->output)
111 return -EINVAL;
112 err = snd_rawmidi_output_status(rfile->output, &status);
113 break;
114 case SNDRV_RAWMIDI_STREAM_INPUT:
115 if (!rfile->input)
116 return -EINVAL;
117 err = snd_rawmidi_input_status(rfile->input, &status);
118 break;
119 default:
120 return -EINVAL;
121 }
122 if (err < 0)
123 return err;
124
125 if (put_timespec(&status.tstamp, &src->tstamp) ||
126 put_user(status.avail, &src->avail) ||
127 put_user(status.xruns, &src->xruns))
128 return -EFAULT;
129
130 return 0;
131 }
132 #endif /* CONFIG_X86_X32 */
133
134 enum {
135 SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
136 SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
137 #ifdef CONFIG_X86_X32
138 SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32),
139 #endif /* CONFIG_X86_X32 */
140 };
141
snd_rawmidi_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)142 static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
143 {
144 struct snd_rawmidi_file *rfile;
145 void __user *argp = compat_ptr(arg);
146
147 rfile = file->private_data;
148 switch (cmd) {
149 case SNDRV_RAWMIDI_IOCTL_PVERSION:
150 case SNDRV_RAWMIDI_IOCTL_INFO:
151 case SNDRV_RAWMIDI_IOCTL_DROP:
152 case SNDRV_RAWMIDI_IOCTL_DRAIN:
153 return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
154 case SNDRV_RAWMIDI_IOCTL_PARAMS32:
155 return snd_rawmidi_ioctl_params_compat(rfile, argp);
156 case SNDRV_RAWMIDI_IOCTL_STATUS32:
157 return snd_rawmidi_ioctl_status_compat(rfile, argp);
158 #ifdef CONFIG_X86_X32
159 case SNDRV_RAWMIDI_IOCTL_STATUS_X32:
160 return snd_rawmidi_ioctl_status_x32(rfile, argp);
161 #endif /* CONFIG_X86_X32 */
162 }
163 return -ENOIOCTLCMD;
164 }
165