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 | } __packed; |
19 | |
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 | } __packed; |
55 | |
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(substream: rfile->output, status: &status); |
71 | break; |
72 | case SNDRV_RAWMIDI_STREAM_INPUT: |
73 | if (!rfile->input) |
74 | return -EINVAL; |
75 | err = snd_rawmidi_input_status(substream: rfile->input, status: &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(to: src, from: &compat_status, n: 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 | |
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(uptr: 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, arg: (unsigned long)argp); |
119 | case SNDRV_RAWMIDI_IOCTL_PARAMS32: |
120 | return snd_rawmidi_ioctl_params_compat(rfile, src: 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, src: argp); |
125 | } |
126 | return -ENOIOCTLCMD; |
127 | } |
128 | |