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(¶ms, 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, ¶ms); 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 data = kmalloc(sizeof(*data), GFP_KERNEL); 259 if (!data) 260 return -ENOMEM; 261 262 /* only fifo_size (RO from userspace) is different, so just copy all */ 263 if (copy_from_user(data, data32, sizeof(*data32))) { 264 err = -EFAULT; 265 goto error; 266 } 267 268 if (refine) 269 err = snd_pcm_hw_refine(substream, data); 270 else 271 err = snd_pcm_hw_params(substream, data); 272 if (err < 0) 273 goto error; 274 if (copy_to_user(data32, data, sizeof(*data32)) || 275 put_user(data->fifo_size, &data32->fifo_size)) { 276 err = -EFAULT; 277 goto error; 278 } 279 280 if (! refine) { 281 unsigned int new_boundary = recalculate_boundary(runtime); 282 if (new_boundary) 283 runtime->boundary = new_boundary; 284 } 285 error: 286 kfree(data); 287 return err; 288 } 289 290 291 /* 292 */ 293 struct snd_xferi32 { 294 s32 result; 295 u32 buf; 296 u32 frames; 297 }; 298 299 static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream, 300 int dir, struct snd_xferi32 __user *data32) 301 { 302 compat_caddr_t buf; 303 u32 frames; 304 int err; 305 306 if (! substream->runtime) 307 return -ENOTTY; 308 if (substream->stream != dir) 309 return -EINVAL; 310 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) 311 return -EBADFD; 312 313 if (get_user(buf, &data32->buf) || 314 get_user(frames, &data32->frames)) 315 return -EFAULT; 316 317 if (dir == SNDRV_PCM_STREAM_PLAYBACK) 318 err = snd_pcm_lib_write(substream, compat_ptr(buf), frames); 319 else 320 err = snd_pcm_lib_read(substream, compat_ptr(buf), frames); 321 if (err < 0) 322 return err; 323 /* copy the result */ 324 if (put_user(err, &data32->result)) 325 return -EFAULT; 326 return 0; 327 } 328 329 330 /* snd_xfern needs remapping of bufs */ 331 struct snd_xfern32 { 332 s32 result; 333 u32 bufs; /* this is void **; */ 334 u32 frames; 335 }; 336 337 /* 338 * xfern ioctl nees to copy (up to) 128 pointers on stack. 339 * although we may pass the copied pointers through f_op->ioctl, but the ioctl 340 * handler there expands again the same 128 pointers on stack, so it is better 341 * to handle the function (calling pcm_readv/writev) directly in this handler. 342 */ 343 static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream, 344 int dir, struct snd_xfern32 __user *data32) 345 { 346 compat_caddr_t buf; 347 compat_caddr_t __user *bufptr; 348 u32 frames; 349 void __user **bufs; 350 int err, ch, i; 351 352 if (! substream->runtime) 353 return -ENOTTY; 354 if (substream->stream != dir) 355 return -EINVAL; 356 357 if ((ch = substream->runtime->channels) > 128) 358 return -EINVAL; 359 if (get_user(buf, &data32->bufs) || 360 get_user(frames, &data32->frames)) 361 return -EFAULT; 362 bufptr = compat_ptr(buf); 363 bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL); 364 if (bufs == NULL) 365 return -ENOMEM; 366 for (i = 0; i < ch; i++) { 367 u32 ptr; 368 if (get_user(ptr, bufptr)) { 369 kfree(bufs); 370 return -EFAULT; 371 } 372 bufs[i] = compat_ptr(ptr); 373 bufptr++; 374 } 375 if (dir == SNDRV_PCM_STREAM_PLAYBACK) 376 err = snd_pcm_lib_writev(substream, bufs, frames); 377 else 378 err = snd_pcm_lib_readv(substream, bufs, frames); 379 if (err >= 0) { 380 if (put_user(err, &data32->result)) 381 err = -EFAULT; 382 } 383 kfree(bufs); 384 return err; 385 } 386 387 388 struct snd_pcm_mmap_status32 { 389 s32 state; 390 s32 pad1; 391 u32 hw_ptr; 392 struct compat_timespec tstamp; 393 s32 suspended_state; 394 struct compat_timespec audio_tstamp; 395 } __attribute__((packed)); 396 397 struct snd_pcm_mmap_control32 { 398 u32 appl_ptr; 399 u32 avail_min; 400 }; 401 402 struct snd_pcm_sync_ptr32 { 403 u32 flags; 404 union { 405 struct snd_pcm_mmap_status32 status; 406 unsigned char reserved[64]; 407 } s; 408 union { 409 struct snd_pcm_mmap_control32 control; 410 unsigned char reserved[64]; 411 } c; 412 } __attribute__((packed)); 413 414 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, 415 struct snd_pcm_sync_ptr32 __user *src) 416 { 417 struct snd_pcm_runtime *runtime = substream->runtime; 418 volatile struct snd_pcm_mmap_status *status; 419 volatile struct snd_pcm_mmap_control *control; 420 u32 sflags; 421 struct snd_pcm_mmap_control scontrol; 422 struct snd_pcm_mmap_status sstatus; 423 snd_pcm_uframes_t boundary; 424 int err; 425 426 if (snd_BUG_ON(!runtime)) 427 return -EINVAL; 428 429 if (get_user(sflags, &src->flags) || 430 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 431 get_user(scontrol.avail_min, &src->c.control.avail_min)) 432 return -EFAULT; 433 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 434 err = snd_pcm_hwsync(substream); 435 if (err < 0) 436 return err; 437 } 438 status = runtime->status; 439 control = runtime->control; 440 boundary = recalculate_boundary(runtime); 441 if (! boundary) 442 boundary = 0x7fffffff; 443 snd_pcm_stream_lock_irq(substream); 444 /* FIXME: we should consider the boundary for the sync from app */ 445 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 446 control->appl_ptr = scontrol.appl_ptr; 447 else 448 scontrol.appl_ptr = control->appl_ptr % boundary; 449 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 450 control->avail_min = scontrol.avail_min; 451 else 452 scontrol.avail_min = control->avail_min; 453 sstatus.state = status->state; 454 sstatus.hw_ptr = status->hw_ptr % boundary; 455 sstatus.tstamp = status->tstamp; 456 sstatus.suspended_state = status->suspended_state; 457 sstatus.audio_tstamp = status->audio_tstamp; 458 snd_pcm_stream_unlock_irq(substream); 459 if (put_user(sstatus.state, &src->s.status.state) || 460 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || 461 compat_put_timespec(&sstatus.tstamp, &src->s.status.tstamp) || 462 put_user(sstatus.suspended_state, &src->s.status.suspended_state) || 463 compat_put_timespec(&sstatus.audio_tstamp, 464 &src->s.status.audio_tstamp) || 465 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 466 put_user(scontrol.avail_min, &src->c.control.avail_min)) 467 return -EFAULT; 468 469 return 0; 470 } 471 472 473 /* 474 */ 475 enum { 476 SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32), 477 SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32), 478 SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32), 479 SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32), 480 SNDRV_PCM_IOCTL_STATUS_EXT32 = _IOWR('A', 0x24, struct snd_pcm_status32), 481 SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32), 482 SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32), 483 SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32), 484 SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32), 485 SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32), 486 SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32), 487 SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32), 488 SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32), 489 SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32), 490 491 }; 492 493 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 494 { 495 struct snd_pcm_file *pcm_file; 496 struct snd_pcm_substream *substream; 497 void __user *argp = compat_ptr(arg); 498 499 pcm_file = file->private_data; 500 if (! pcm_file) 501 return -ENOTTY; 502 substream = pcm_file->substream; 503 if (! substream) 504 return -ENOTTY; 505 506 /* 507 * When PCM is used on 32bit mode, we need to disable 508 * mmap of PCM status/control records because of the size 509 * incompatibility. 510 */ 511 pcm_file->no_compat_mmap = 1; 512 513 switch (cmd) { 514 case SNDRV_PCM_IOCTL_PVERSION: 515 case SNDRV_PCM_IOCTL_INFO: 516 case SNDRV_PCM_IOCTL_TSTAMP: 517 case SNDRV_PCM_IOCTL_TTSTAMP: 518 case SNDRV_PCM_IOCTL_HWSYNC: 519 case SNDRV_PCM_IOCTL_PREPARE: 520 case SNDRV_PCM_IOCTL_RESET: 521 case SNDRV_PCM_IOCTL_START: 522 case SNDRV_PCM_IOCTL_DROP: 523 case SNDRV_PCM_IOCTL_DRAIN: 524 case SNDRV_PCM_IOCTL_PAUSE: 525 case SNDRV_PCM_IOCTL_HW_FREE: 526 case SNDRV_PCM_IOCTL_RESUME: 527 case SNDRV_PCM_IOCTL_XRUN: 528 case SNDRV_PCM_IOCTL_LINK: 529 case SNDRV_PCM_IOCTL_UNLINK: 530 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 531 return snd_pcm_playback_ioctl1(file, substream, cmd, argp); 532 else 533 return snd_pcm_capture_ioctl1(file, substream, cmd, argp); 534 case SNDRV_PCM_IOCTL_HW_REFINE32: 535 return snd_pcm_ioctl_hw_params_compat(substream, 1, argp); 536 case SNDRV_PCM_IOCTL_HW_PARAMS32: 537 return snd_pcm_ioctl_hw_params_compat(substream, 0, argp); 538 case SNDRV_PCM_IOCTL_SW_PARAMS32: 539 return snd_pcm_ioctl_sw_params_compat(substream, argp); 540 case SNDRV_PCM_IOCTL_STATUS32: 541 return snd_pcm_status_user_compat(substream, argp, false); 542 case SNDRV_PCM_IOCTL_STATUS_EXT32: 543 return snd_pcm_status_user_compat(substream, argp, true); 544 case SNDRV_PCM_IOCTL_SYNC_PTR32: 545 return snd_pcm_ioctl_sync_ptr_compat(substream, argp); 546 case SNDRV_PCM_IOCTL_CHANNEL_INFO32: 547 return snd_pcm_ioctl_channel_info_compat(substream, argp); 548 case SNDRV_PCM_IOCTL_WRITEI_FRAMES32: 549 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp); 550 case SNDRV_PCM_IOCTL_READI_FRAMES32: 551 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp); 552 case SNDRV_PCM_IOCTL_WRITEN_FRAMES32: 553 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp); 554 case SNDRV_PCM_IOCTL_READN_FRAMES32: 555 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp); 556 case SNDRV_PCM_IOCTL_DELAY32: 557 return snd_pcm_ioctl_delay_compat(substream, argp); 558 case SNDRV_PCM_IOCTL_REWIND32: 559 return snd_pcm_ioctl_rewind_compat(substream, argp); 560 case SNDRV_PCM_IOCTL_FORWARD32: 561 return snd_pcm_ioctl_forward_compat(substream, argp); 562 } 563 564 return -ENOIOCTLCMD; 565 } 566