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 (rfile->output == NULL)
  40                 return -EINVAL;
  41         if (get_user(params.stream, &src->stream) ||
  42             get_user(params.buffer_size, &src->buffer_size) ||
  43             get_user(params.avail_min, &src->avail_min) ||
  44             get_user(val, &src->no_active_sensing))
  45                 return -EFAULT;
  46         params.no_active_sensing = val;
  47         switch (params.stream) {
  48         case SNDRV_RAWMIDI_STREAM_OUTPUT:
  49                 return snd_rawmidi_output_params(rfile->output, &params);
  50         case SNDRV_RAWMIDI_STREAM_INPUT:
  51                 return snd_rawmidi_input_params(rfile->input, &params);
  52         }
  53         return -EINVAL;
  54 }
  55
  56 struct snd_rawmidi_status32 {
  57         s32 stream;
  58         struct compat_timespec tstamp;
  59         u32 avail;
  60         u32 xruns;
  61         unsigned char reserved[16];
  62 } __attribute__((packed));
  63
  64 static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
  65                                            struct snd_rawmidi_status32 __user *src)
  66 {
  67         int err;
  68         struct snd_rawmidi_status status;
  69
  70         if (rfile->output == NULL)
  71                 return -EINVAL;
  72         if (get_user(status.stream, &src->stream))
  73                 return -EFAULT;
  74
  75         switch (status.stream) {
  76         case SNDRV_RAWMIDI_STREAM_OUTPUT:
  77                 err = snd_rawmidi_output_status(rfile->output, &status);
  78                 break;
  79         case SNDRV_RAWMIDI_STREAM_INPUT:
  80                 err = snd_rawmidi_input_status(rfile->input, &status);
  81                 break;
  82         default:
  83                 return -EINVAL;
  84         }
  85         if (err < 0)
  86                 return err;
  87
  88         if (compat_put_timespec(&status.tstamp, &src->tstamp) ||
  89             put_user(status.avail, &src->avail) ||
  90             put_user(status.xruns, &src->xruns))
  91                 return -EFAULT;
  92
  93         return 0;
  94 }
  95
  96 #ifdef CONFIG_X86_X32
  97 /* X32 ABI has 64bit timespec and 64bit alignment */
  98 struct snd_rawmidi_status_x32 {
  99         s32 stream;
 100         u32 rsvd; /* alignment */
 101         struct timespec tstamp;
 102         u32 avail;
 103         u32 xruns;
 104         unsigned char reserved[16];
 105 } __attribute__((packed));
 106
 107 #define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
 108
 109 static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
 110                                         struct snd_rawmidi_status_x32 __user *src)
 111 {
 112         int err;
 113         struct snd_rawmidi_status status;
 114
 115         if (rfile->output == NULL)
 116                 return -EINVAL;
 117         if (get_user(status.stream, &src->stream))
 118                 return -EFAULT;
 119
 120         switch (status.stream) {
 121         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 122                 err = snd_rawmidi_output_status(rfile->output, &status);
 123                 break;
 124         case SNDRV_RAWMIDI_STREAM_INPUT:
 125                 err = snd_rawmidi_input_status(rfile->input, &status);
 126                 break;
 127         default:
 128                 return -EINVAL;
 129         }
 130         if (err < 0)
 131                 return err;
 132
 133         if (put_timespec(&status.tstamp, &src->tstamp) ||
 134             put_user(status.avail, &src->avail) ||
 135             put_user(status.xruns, &src->xruns))
 136                 return -EFAULT;
 137
 138         return 0;
 139 }
 140 #endif /* CONFIG_X86_X32 */
 141
 142 enum {
 143         SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
 144         SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
 145 #ifdef CONFIG_X86_X32
 146         SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32),
 147 #endif /* CONFIG_X86_X32 */
 148 };
 149
 150 static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 151 {
 152         struct snd_rawmidi_file *rfile;
 153         void __user *argp = compat_ptr(arg);
 154
 155         rfile = file->private_data;
 156         switch (cmd) {
 157         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 158         case SNDRV_RAWMIDI_IOCTL_INFO:
 159         case SNDRV_RAWMIDI_IOCTL_DROP:
 160         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 161                 return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
 162         case SNDRV_RAWMIDI_IOCTL_PARAMS32:
 163                 return snd_rawmidi_ioctl_params_compat(rfile, argp);
 164         case SNDRV_RAWMIDI_IOCTL_STATUS32:
 165                 return snd_rawmidi_ioctl_status_compat(rfile, argp);
 166 #ifdef CONFIG_X86_X32
 167         case SNDRV_RAWMIDI_IOCTL_STATUS_X32:
 168                 return snd_rawmidi_ioctl_status_x32(rfile, argp);
 169 #endif /* CONFIG_X86_X32 */
 170         }
 171         return -ENOIOCTLCMD;
 172 }