sound/core/rawmidi_compat.c

   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
  25 struct 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
  33 static 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
  58 struct 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
  66 static 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 */
 102 struct 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
 113 static 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
 148 enum {
 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
 156 static 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 }