kernel/sound/core/pcm_compat.c

   1 /*
   2  *   32bit -> 64bit ioctl wrapper for PCM 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 pcm_native.c */
  22
  23 #include <linux/compat.h>
  24 #include <linux/slab.h>
  25
  26 static int snd_pcm_ioctl_delay_compat(struct snd_pcm_substream *substream,
  27                                       s32 __user *src)
  28 {
  29         snd_pcm_sframes_t delay;
  30         mm_segment_t fs;
  31         int err;
  32
  33         fs = snd_enter_user();
  34         err = snd_pcm_delay(substream, &delay);
  35         snd_leave_user(fs);
  36         if (err < 0)
  37                 return err;
  38         if (put_user(delay, src))
  39                 return -EFAULT;
  40         return err;
  41 }
  42
  43 static int snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream *substream,
  44                                        u32 __user *src)
  45 {
  46         snd_pcm_uframes_t frames;
  47         int err;
  48
  49         if (get_user(frames, src))
  50                 return -EFAULT;
  51         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  52                 err = snd_pcm_playback_rewind(substream, frames);
  53         else
  54                 err = snd_pcm_capture_rewind(substream, frames);
  55         if (put_user(err, src))
  56                 return -EFAULT;
  57         return err < 0 ? err : 0;
  58 }
  59
  60 static int snd_pcm_ioctl_forward_compat(struct snd_pcm_substream *substream,
  61                                        u32 __user *src)
  62 {
  63         snd_pcm_uframes_t frames;
  64         int err;
  65
  66         if (get_user(frames, src))
  67                 return -EFAULT;
  68         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  69                 err = snd_pcm_playback_forward(substream, frames);
  70         else
  71                 err = snd_pcm_capture_forward(substream, frames);
  72         if (put_user(err, src))
  73                 return -EFAULT;
  74         return err < 0 ? err : 0;
  75 }
  76
  77 struct snd_pcm_hw_params32 {
  78         u32 flags;
  79         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
  80         struct snd_mask mres[5];        /* reserved masks */
  81         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
  82         struct snd_interval ires[9];    /* reserved intervals */
  83         u32 rmask;
  84         u32 cmask;
  85         u32 info;
  86         u32 msbits;
  87         u32 rate_num;
  88         u32 rate_den;
  89         u32 fifo_size;
  90         unsigned char reserved[64];
  91 };
  92
  93 struct snd_pcm_sw_params32 {
  94         s32 tstamp_mode;
  95         u32 period_step;
  96         u32 sleep_min;
  97         u32 avail_min;
  98         u32 xfer_align;
  99         u32 start_threshold;
 100         u32 stop_threshold;
 101         u32 silence_threshold;
 102         u32 silence_size;
 103         u32 boundary;
 104         u32 proto;
 105         u32 tstamp_type;
 106         unsigned char reserved[56];
 107 };
 108
 109 /* recalcuate the boundary within 32bit */
 110 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
 111 {
 112         snd_pcm_uframes_t boundary;
 113
 114         if (! runtime->buffer_size)
 115                 return 0;
 116         boundary = runtime->buffer_size;
 117         while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
 118                 boundary *= 2;
 119         return boundary;
 120 }
 121
 122 static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream,
 123                                           struct snd_pcm_sw_params32 __user *src)
 124 {
 125         struct snd_pcm_sw_params params;
 126         snd_pcm_uframes_t boundary;
 127         int err;
 128
 129         memset(&params, 0, sizeof(params));
 130         if (get_user(params.tstamp_mode, &src->tstamp_mode) ||
 131             get_user(params.period_step, &src->period_step) ||
 132             get_user(params.sleep_min, &src->sleep_min) ||
 133             get_user(params.avail_min, &src->avail_min) ||
 134             get_user(params.xfer_align, &src->xfer_align) ||
 135             get_user(params.start_threshold, &src->start_threshold) ||
 136             get_user(params.stop_threshold, &src->stop_threshold) ||
 137             get_user(params.silence_threshold, &src->silence_threshold) ||
 138             get_user(params.silence_size, &src->silence_size) ||
 139             get_user(params.tstamp_type, &src->tstamp_type) ||
 140             get_user(params.proto, &src->proto))
 141                 return -EFAULT;
 142         /*
 143          * Check silent_size parameter.  Since we have 64bit boundary,
 144          * silence_size must be compared with the 32bit boundary.
 145          */
 146         boundary = recalculate_boundary(substream->runtime);
 147         if (boundary && params.silence_size >= boundary)
 148                 params.silence_size = substream->runtime->boundary;
 149         err = snd_pcm_sw_params(substream, &params);
 150         if (err < 0)
 151                 return err;
 152         if (boundary && put_user(boundary, &src->boundary))
 153                 return -EFAULT;
 154         return err;
 155 }
 156
 157 struct snd_pcm_channel_info32 {
 158         u32 channel;
 159         u32 offset;
 160         u32 first;
 161         u32 step;
 162 };
 163
 164 static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream,
 165                                              struct snd_pcm_channel_info32 __user *src)
 166 {
 167         struct snd_pcm_channel_info info;
 168         int err;
 169
 170         if (get_user(info.channel, &src->channel) ||
 171             get_user(info.offset, &src->offset) ||
 172             get_user(info.first, &src->first) ||
 173             get_user(info.step, &src->step))
 174                 return -EFAULT;
 175         err = snd_pcm_channel_info(substream, &info);
 176         if (err < 0)
 177                 return err;
 178         if (put_user(info.channel, &src->channel) ||
 179             put_user(info.offset, &src->offset) ||
 180             put_user(info.first, &src->first) ||
 181             put_user(info.step, &src->step))
 182                 return -EFAULT;
 183         return err;
 184 }
 185
 186 struct snd_pcm_status32 {
 187         s32 state;
 188         struct compat_timespec trigger_tstamp;
 189         struct compat_timespec tstamp;
 190         u32 appl_ptr;
 191         u32 hw_ptr;
 192         s32 delay;
 193         u32 avail;
 194         u32 avail_max;
 195         u32 overrange;
 196         s32 suspended_state;
 197         u32 audio_tstamp_data;
 198         struct compat_timespec audio_tstamp;
 199         struct compat_timespec driver_tstamp;
 200         u32 audio_tstamp_accuracy;
 201         unsigned char reserved[52-2*sizeof(struct compat_timespec)];
 202 } __attribute__((packed));
 203
 204
 205 static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
 206                                       struct snd_pcm_status32 __user *src,
 207                                       bool ext)
 208 {
 209         struct snd_pcm_status status;
 210         int err;
 211
 212         memset(&status, 0, sizeof(status));
 213         /*
 214          * with extension, parameters are read/write,
 215          * get audio_tstamp_data from user,
 216          * ignore rest of status structure
 217          */
 218         if (ext && get_user(status.audio_tstamp_data,
 219                                 (u32 __user *)(&src->audio_tstamp_data)))
 220                 return -EFAULT;
 221         err = snd_pcm_status(substream, &status);
 222         if (err < 0)
 223                 return err;
 224
 225         if (clear_user(src, sizeof(*src)))
 226                 return -EFAULT;
 227         if (put_user(status.state, &src->state) ||
 228             compat_put_timespec(&status.trigger_tstamp, &src->trigger_tstamp) ||
 229             compat_put_timespec(&status.tstamp, &src->tstamp) ||
 230             put_user(status.appl_ptr, &src->appl_ptr) ||
 231             put_user(status.hw_ptr, &src->hw_ptr) ||
 232             put_user(status.delay, &src->delay) ||
 233             put_user(status.avail, &src->avail) ||
 234             put_user(status.avail_max, &src->avail_max) ||
 235             put_user(status.overrange, &src->overrange) ||
 236             put_user(status.suspended_state, &src->suspended_state) ||
 237             put_user(status.audio_tstamp_data, &src->audio_tstamp_data) ||
 238             compat_put_timespec(&status.audio_tstamp, &src->audio_tstamp) ||
 239             compat_put_timespec(&status.driver_tstamp, &src->driver_tstamp) ||
 240             put_user(status.audio_tstamp_accuracy, &src->audio_tstamp_accuracy))
 241                 return -EFAULT;
 242
 243         return err;
 244 }
 245
 246 /* both for HW_PARAMS and HW_REFINE */
 247 static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
 248                                           int refine,
 249                                           struct snd_pcm_hw_params32 __user *data32)
 250 {
 251         struct snd_pcm_hw_params *data;
 252         struct snd_pcm_runtime *runtime;
 253         int err;
 254
 255         if (! (runtime = substream->runtime))
 256                 return -ENOTTY;
 257
 258         /* only fifo_size is different, so just copy all */
 259         data = memdup_user(data32, sizeof(*data32));
 260         if (IS_ERR(data))
 261                 return PTR_ERR(data);
 262
 263         if (refine)
 264                 err = snd_pcm_hw_refine(substream, data);
 265         else
 266                 err = snd_pcm_hw_params(substream, data);
 267         if (err < 0)
 268                 goto error;
 269         if (copy_to_user(data32, data, sizeof(*data32)) ||
 270             put_user(data->fifo_size, &data32->fifo_size)) {
 271                 err = -EFAULT;
 272                 goto error;
 273         }
 274
 275         if (! refine) {
 276                 unsigned int new_boundary = recalculate_boundary(runtime);
 277                 if (new_boundary)
 278                         runtime->boundary = new_boundary;
 279         }
 280  error:
 281         kfree(data);
 282         return err;
 283 }
 284
 285
 286 /*
 287  */
 288 struct snd_xferi32 {
 289         s32 result;
 290         u32 buf;
 291         u32 frames;
 292 };
 293
 294 static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream,
 295                                       int dir, struct snd_xferi32 __user *data32)
 296 {
 297         compat_caddr_t buf;
 298         u32 frames;
 299         int err;
 300
 301         if (! substream->runtime)
 302                 return -ENOTTY;
 303         if (substream->stream != dir)
 304                 return -EINVAL;
 305         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 306                 return -EBADFD;
 307
 308         if (get_user(buf, &data32->buf) ||
 309             get_user(frames, &data32->frames))
 310                 return -EFAULT;
 311
 312         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 313                 err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
 314         else
 315                 err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
 316         if (err < 0)
 317                 return err;
 318         /* copy the result */
 319         if (put_user(err, &data32->result))
 320                 return -EFAULT;
 321         return 0;
 322 }
 323
 324
 325 /* snd_xfern needs remapping of bufs */
 326 struct snd_xfern32 {
 327         s32 result;
 328         u32 bufs;  /* this is void **; */
 329         u32 frames;
 330 };
 331
 332 /*
 333  * xfern ioctl nees to copy (up to) 128 pointers on stack.
 334  * although we may pass the copied pointers through f_op->ioctl, but the ioctl
 335  * handler there expands again the same 128 pointers on stack, so it is better
 336  * to handle the function (calling pcm_readv/writev) directly in this handler.
 337  */
 338 static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
 339                                       int dir, struct snd_xfern32 __user *data32)
 340 {
 341         compat_caddr_t buf;
 342         compat_caddr_t __user *bufptr;
 343         u32 frames;
 344         void __user **bufs;
 345         int err, ch, i;
 346
 347         if (! substream->runtime)
 348                 return -ENOTTY;
 349         if (substream->stream != dir)
 350                 return -EINVAL;
 351
 352         if ((ch = substream->runtime->channels) > 128)
 353                 return -EINVAL;
 354         if (get_user(buf, &data32->bufs) ||
 355             get_user(frames, &data32->frames))
 356                 return -EFAULT;
 357         bufptr = compat_ptr(buf);
 358         bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL);
 359         if (bufs == NULL)
 360                 return -ENOMEM;
 361         for (i = 0; i < ch; i++) {
 362                 u32 ptr;
 363                 if (get_user(ptr, bufptr)) {
 364                         kfree(bufs);
 365                         return -EFAULT;
 366                 }
 367                 bufs[i] = compat_ptr(ptr);
 368                 bufptr++;
 369         }
 370         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 371                 err = snd_pcm_lib_writev(substream, bufs, frames);
 372         else
 373                 err = snd_pcm_lib_readv(substream, bufs, frames);
 374         if (err >= 0) {
 375                 if (put_user(err, &data32->result))
 376                         err = -EFAULT;
 377         }
 378         kfree(bufs);
 379         return err;
 380 }
 381
 382
 383 struct snd_pcm_mmap_status32 {
 384         s32 state;
 385         s32 pad1;
 386         u32 hw_ptr;
 387         struct compat_timespec tstamp;
 388         s32 suspended_state;
 389         struct compat_timespec audio_tstamp;
 390 } __attribute__((packed));
 391
 392 struct snd_pcm_mmap_control32 {
 393         u32 appl_ptr;
 394         u32 avail_min;
 395 };
 396
 397 struct snd_pcm_sync_ptr32 {
 398         u32 flags;
 399         union {
 400                 struct snd_pcm_mmap_status32 status;
 401                 unsigned char reserved[64];
 402         } s;
 403         union {
 404                 struct snd_pcm_mmap_control32 control;
 405                 unsigned char reserved[64];
 406         } c;
 407 } __attribute__((packed));
 408
 409 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
 410                                          struct snd_pcm_sync_ptr32 __user *src)
 411 {
 412         struct snd_pcm_runtime *runtime = substream->runtime;
 413         volatile struct snd_pcm_mmap_status *status;
 414         volatile struct snd_pcm_mmap_control *control;
 415         u32 sflags;
 416         struct snd_pcm_mmap_control scontrol;
 417         struct snd_pcm_mmap_status sstatus;
 418         snd_pcm_uframes_t boundary;
 419         int err;
 420
 421         if (snd_BUG_ON(!runtime))
 422                 return -EINVAL;
 423
 424         if (get_user(sflags, &src->flags) ||
 425             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 426             get_user(scontrol.avail_min, &src->c.control.avail_min))
 427                 return -EFAULT;
 428         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
 429                 err = snd_pcm_hwsync(substream);
 430                 if (err < 0)
 431                         return err;
 432         }
 433         status = runtime->status;
 434         control = runtime->control;
 435         boundary = recalculate_boundary(runtime);
 436         if (! boundary)
 437                 boundary = 0x7fffffff;
 438         snd_pcm_stream_lock_irq(substream);
 439         /* FIXME: we should consider the boundary for the sync from app */
 440         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
 441                 control->appl_ptr = scontrol.appl_ptr;
 442         else
 443                 scontrol.appl_ptr = control->appl_ptr % boundary;
 444         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
 445                 control->avail_min = scontrol.avail_min;
 446         else
 447                 scontrol.avail_min = control->avail_min;
 448         sstatus.state = status->state;
 449         sstatus.hw_ptr = status->hw_ptr % boundary;
 450         sstatus.tstamp = status->tstamp;
 451         sstatus.suspended_state = status->suspended_state;
 452         sstatus.audio_tstamp = status->audio_tstamp;
 453         snd_pcm_stream_unlock_irq(substream);
 454         if (put_user(sstatus.state, &src->s.status.state) ||
 455             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
 456             compat_put_timespec(&sstatus.tstamp, &src->s.status.tstamp) ||
 457             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
 458             compat_put_timespec(&sstatus.audio_tstamp,
 459                     &src->s.status.audio_tstamp) ||
 460             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 461             put_user(scontrol.avail_min, &src->c.control.avail_min))
 462                 return -EFAULT;
 463
 464         return 0;
 465 }
 466
 467
 468 /*
 469  */
 470 enum {
 471         SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
 472         SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
 473         SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
 474         SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32),
 475         SNDRV_PCM_IOCTL_STATUS_EXT32 = _IOWR('A', 0x24, struct snd_pcm_status32),
 476         SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
 477         SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
 478         SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
 479         SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
 480         SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
 481         SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
 482         SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
 483         SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
 484         SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32),
 485
 486 };
 487
 488 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 489 {
 490         struct snd_pcm_file *pcm_file;
 491         struct snd_pcm_substream *substream;
 492         void __user *argp = compat_ptr(arg);
 493
 494         pcm_file = file->private_data;
 495         if (! pcm_file)
 496                 return -ENOTTY;
 497         substream = pcm_file->substream;
 498         if (! substream)
 499                 return -ENOTTY;
 500
 501         /*
 502          * When PCM is used on 32bit mode, we need to disable
 503          * mmap of PCM status/control records because of the size
 504          * incompatibility.
 505          */
 506         pcm_file->no_compat_mmap = 1;
 507
 508         switch (cmd) {
 509         case SNDRV_PCM_IOCTL_PVERSION:
 510         case SNDRV_PCM_IOCTL_INFO:
 511         case SNDRV_PCM_IOCTL_TSTAMP:
 512         case SNDRV_PCM_IOCTL_TTSTAMP:
 513         case SNDRV_PCM_IOCTL_HWSYNC:
 514         case SNDRV_PCM_IOCTL_PREPARE:
 515         case SNDRV_PCM_IOCTL_RESET:
 516         case SNDRV_PCM_IOCTL_START:
 517         case SNDRV_PCM_IOCTL_DROP:
 518         case SNDRV_PCM_IOCTL_DRAIN:
 519         case SNDRV_PCM_IOCTL_PAUSE:
 520         case SNDRV_PCM_IOCTL_HW_FREE:
 521         case SNDRV_PCM_IOCTL_RESUME:
 522         case SNDRV_PCM_IOCTL_XRUN:
 523         case SNDRV_PCM_IOCTL_LINK:
 524         case SNDRV_PCM_IOCTL_UNLINK:
 525                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 526                         return snd_pcm_playback_ioctl1(file, substream, cmd, argp);
 527                 else
 528                         return snd_pcm_capture_ioctl1(file, substream, cmd, argp);
 529         case SNDRV_PCM_IOCTL_HW_REFINE32:
 530                 return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
 531         case SNDRV_PCM_IOCTL_HW_PARAMS32:
 532                 return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
 533         case SNDRV_PCM_IOCTL_SW_PARAMS32:
 534                 return snd_pcm_ioctl_sw_params_compat(substream, argp);
 535         case SNDRV_PCM_IOCTL_STATUS32:
 536                 return snd_pcm_status_user_compat(substream, argp, false);
 537         case SNDRV_PCM_IOCTL_STATUS_EXT32:
 538                 return snd_pcm_status_user_compat(substream, argp, true);
 539         case SNDRV_PCM_IOCTL_SYNC_PTR32:
 540                 return snd_pcm_ioctl_sync_ptr_compat(substream, argp);
 541         case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
 542                 return snd_pcm_ioctl_channel_info_compat(substream, argp);
 543         case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
 544                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 545         case SNDRV_PCM_IOCTL_READI_FRAMES32:
 546                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 547         case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
 548                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 549         case SNDRV_PCM_IOCTL_READN_FRAMES32:
 550                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 551         case SNDRV_PCM_IOCTL_DELAY32:
 552                 return snd_pcm_ioctl_delay_compat(substream, argp);
 553         case SNDRV_PCM_IOCTL_REWIND32:
 554                 return snd_pcm_ioctl_rewind_compat(substream, argp);
 555         case SNDRV_PCM_IOCTL_FORWARD32:
 556                 return snd_pcm_ioctl_forward_compat(substream, argp);
 557         }
 558
 559         return -ENOIOCTLCMD;
 560 }