LXR linux/sound/core/rawmidi

   1/*
   2 *   32bit -> 64bit ioctl wrapper for raw MIDI API
   3 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   4 *
   5 *   This program is free software; you can redistribute it and/or modify
   6 *   it under the terms of the GNU General Public License as published by
   7 *   the Free Software Foundation; either version 2 of the License, or
   8 *   (at your option) any later version.
   9 *
  10 *   This program is distributed in the hope that it will be useful,
  11 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 *   GNU General Public License for more details.
  14 *
  15 *   You should have received a copy of the GNU General Public License
  16 *   along with this program; if not, write to the Free Software
  17 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18 *
  19 */
  20
  21/* This file included from rawmidi.c */
  22
  23#include <linux/compat.h>
  24
  25struct snd_rawmidi_params32 {
  26        s32 stream;
  27        u32 buffer_size;
  28        u32 avail_min;
  29        unsigned int no_active_sensing; /* avoid bit-field */
  30        unsigned char reserved[16];
  31} __attribute__((packed));
  32
  33static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
  34                                           struct snd_rawmidi_params32 __user *src)
  35{
  36        struct snd_rawmidi_params params;
  37        unsigned int val;
  38
  39        if (get_user(params.stream, &src->stream) ||
  40            get_user(params.buffer_size, &src->buffer_size) ||
  41            get_user(params.avail_min, &src->avail_min) ||
  42            get_user(val, &src->no_active_sensing))
  43                return -EFAULT;
  44        params.no_active_sensing = val;
  45        switch (params.stream) {
  46        case SNDRV_RAWMIDI_STREAM_OUTPUT:
  47                if (!rfile->output)
  48                        return -EINVAL;
  49                return snd_rawmidi_output_params(rfile->output, &params);
  50        case SNDRV_RAWMIDI_STREAM_INPUT:
  51                if (!rfile->input)
  52                        return -EINVAL;
  53                return snd_rawmidi_input_params(rfile->input, &params);
  54        }
  55        return -EINVAL;
  56}
  57
  58struct snd_rawmidi_status32 {
  59        s32 stream;
  60        struct compat_timespec tstamp;
  61        u32 avail;
  62        u32 xruns;
  63        unsigned char reserved[16];
  64} __attribute__((packed));
  65
  66static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
  67                                           struct snd_rawmidi_status32 __user *src)
  68{
  69        int err;
  70        struct snd_rawmidi_status status;
  71
  72        if (get_user(status.stream, &src->stream))
  73                return -EFAULT;
  74
  75        switch (status.stream) {
  76        case SNDRV_RAWMIDI_STREAM_OUTPUT:
  77                if (!rfile->output)
  78                        return -EINVAL;
  79                err = snd_rawmidi_output_status(rfile->output, &status);
  80                break;
  81        case SNDRV_RAWMIDI_STREAM_INPUT:
  82                if (!rfile->input)
  83                        return -EINVAL;
  84                err = snd_rawmidi_input_status(rfile->input, &status);
  85                break;
  86        default:
  87                return -EINVAL;
  88        }
  89        if (err < 0)
  90                return err;
  91
  92        if (compat_put_timespec(&status.tstamp, &src->tstamp) ||
  93            put_user(status.avail, &src->avail) ||
  94            put_user(status.xruns, &src->xruns))
  95                return -EFAULT;
  96
  97        return 0;
  98}
  99
 100#ifdef CONFIG_X86_X32
 101/* X32 ABI has 64bit timespec and 64bit alignment */
 102struct snd_rawmidi_status_x32 {
 103        s32 stream;
 104        u32 rsvd; /* alignment */
 105        struct timespec tstamp;
 106        u32 avail;
 107        u32 xruns;
 108        unsigned char reserved[16];
 109} __attribute__((packed));
 110
 111#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
 112
 113static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
 114                                        struct snd_rawmidi_status_x32 __user *src)
 115{
 116        int err;
 117        struct snd_rawmidi_status status;
 118
 119        if (get_user(status.stream, &src->stream))
 120                return -EFAULT;
 121
 122        switch (status.stream) {
 123        case SNDRV_RAWMIDI_STREAM_OUTPUT:
 124                if (!rfile->output)
 125                        return -EINVAL;
 126                err = snd_rawmidi_output_status(rfile->output, &status);
 127                break;
 128        case SNDRV_RAWMIDI_STREAM_INPUT:
 129                if (!rfile->input)
 130                        return -EINVAL;
 131                err = snd_rawmidi_input_status(rfile->input, &status);
 132                break;
 133        default:
 134                return -EINVAL;
 135        }
 136        if (err < 0)
 137                return err;
 138
 139        if (put_timespec(&status.tstamp, &src->tstamp) ||
 140            put_user(status.avail, &src->avail) ||
 141            put_user(status.xruns, &src->xruns))
 142                return -EFAULT;
 143
 144        return 0;
 145}
 146#endif /* CONFIG_X86_X32 */
 147
 148enum {
 149        SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
 150        SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
 151#ifdef CONFIG_X86_X32
 152        SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32),
 153#endif /* CONFIG_X86_X32 */
 154};
 155
 156static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 157{
 158        struct snd_rawmidi_file *rfile;
 159        void __user *argp = compat_ptr(arg);
 160
 161        rfile = file->private_data;
 162        switch (cmd) {
 163        case SNDRV_RAWMIDI_IOCTL_PVERSION:
 164        case SNDRV_RAWMIDI_IOCTL_INFO:
 165        case SNDRV_RAWMIDI_IOCTL_DROP:
 166        case SNDRV_RAWMIDI_IOCTL_DRAIN:
 167                return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
 168        case SNDRV_RAWMIDI_IOCTL_PARAMS32:
 169                return snd_rawmidi_ioctl_params_compat(rfile, argp);
 170        case SNDRV_RAWMIDI_IOCTL_STATUS32:
 171                return snd_rawmidi_ioctl_status_compat(rfile, argp);
 172#ifdef CONFIG_X86_X32
 173        case SNDRV_RAWMIDI_IOCTL_STATUS_X32:
 174                return snd_rawmidi_ioctl_status_x32(rfile, argp);
 175#endif /* CONFIG_X86_X32 */
 176        }
 177        return -ENOIOCTLCMD;
 178}
 179