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 (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
  56struct 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
  64static 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 */
  98struct 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
 109static 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
 142enum {
 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
 150static 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}
 173