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 /* 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 } 561