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 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
  52static 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 */
  88struct 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
  99static 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
 134enum {
 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
 142static 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