LXR linux/sound/core/rawmidi

   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
  11struct 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
  19static 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, &params);
  36        case SNDRV_RAWMIDI_STREAM_INPUT:
  37                if (!rfile->input)
  38                        return -EINVAL;
  39                return snd_rawmidi_input_params(rfile->input, &params);
  40        }
  41        return -EINVAL;
  42}
  43
  44struct compat_snd_rawmidi_status64 {
  45        s32 stream;
  46        u8 rsvd[4]; /* alignment */
  47        s64 tstamp_sec;
  48        s64 tstamp_nsec;
  49        u32 avail;
  50        u32 xruns;
  51        unsigned char reserved[16];
  52} __attribute__((packed));
  53
  54static int snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file *rfile,
  55                                             struct compat_snd_rawmidi_status64 __user *src)
  56{
  57        int err;
  58        struct snd_rawmidi_status64 status;
  59        struct compat_snd_rawmidi_status64 compat_status;
  60
  61        if (get_user(status.stream, &src->stream))
  62                return -EFAULT;
  63
  64        switch (status.stream) {
  65        case SNDRV_RAWMIDI_STREAM_OUTPUT:
  66                if (!rfile->output)
  67                        return -EINVAL;
  68                err = snd_rawmidi_output_status(rfile->output, &status);
  69                break;
  70        case SNDRV_RAWMIDI_STREAM_INPUT:
  71                if (!rfile->input)
  72                        return -EINVAL;
  73                err = snd_rawmidi_input_status(rfile->input, &status);
  74                break;
  75        default:
  76                return -EINVAL;
  77        }
  78        if (err < 0)
  79                return err;
  80
  81        compat_status = (struct compat_snd_rawmidi_status64) {
  82                .stream = status.stream,
  83                .tstamp_sec = status.tstamp_sec,
  84                .tstamp_nsec = status.tstamp_nsec,
  85                .avail = status.avail,
  86                .xruns = status.xruns,
  87        };
  88
  89        if (copy_to_user(src, &compat_status, sizeof(*src)))
  90                return -EFAULT;
  91
  92        return 0;
  93}
  94
  95enum {
  96        SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
  97        SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
  98        SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64 = _IOWR('W', 0x20, struct compat_snd_rawmidi_status64),
  99};
 100
 101static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 102{
 103        struct snd_rawmidi_file *rfile;
 104        void __user *argp = compat_ptr(arg);
 105
 106        rfile = file->private_data;
 107        switch (cmd) {
 108        case SNDRV_RAWMIDI_IOCTL_PVERSION:
 109        case SNDRV_RAWMIDI_IOCTL_INFO:
 110        case SNDRV_RAWMIDI_IOCTL_DROP:
 111        case SNDRV_RAWMIDI_IOCTL_DRAIN:
 112                return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
 113        case SNDRV_RAWMIDI_IOCTL_PARAMS32:
 114                return snd_rawmidi_ioctl_params_compat(rfile, argp);
 115        case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32:
 116                return snd_rawmidi_ioctl_status32(rfile, argp);
 117        case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64:
 118                return snd_rawmidi_ioctl_status_compat64(rfile, argp);
 119        }
 120        return -ENOIOCTLCMD;
 121}
 122