sound/core/control_compat.c

   1 /*
   2  * compat ioctls for control API
   3  *
   4  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20
  21 /* this file included from control.c */
  22
  23 #include <linux/compat.h>
  24 #include <linux/slab.h>
  25
  26 struct snd_ctl_elem_list32 {
  27         u32 offset;
  28         u32 space;
  29         u32 used;
  30         u32 count;
  31         u32 pids;
  32         unsigned char reserved[50];
  33 } /* don't set packed attribute here */;
  34
  35 static int snd_ctl_elem_list_compat(struct snd_card *card,
  36                                     struct snd_ctl_elem_list32 __user *data32)
  37 {
  38         struct snd_ctl_elem_list __user *data;
  39         compat_caddr_t ptr;
  40         int err;
  41
  42         data = compat_alloc_user_space(sizeof(*data));
  43
  44         /* offset, space, used, count */
  45         if (copy_in_user(data, data32, 4 * sizeof(u32)))
  46                 return -EFAULT;
  47         /* pids */
  48         if (get_user(ptr, &data32->pids) ||
  49             put_user(compat_ptr(ptr), &data->pids))
  50                 return -EFAULT;
  51         err = snd_ctl_elem_list(card, data);
  52         if (err < 0)
  53                 return err;
  54         /* copy the result */
  55         if (copy_in_user(data32, data, 4 * sizeof(u32)))
  56                 return -EFAULT;
  57         return 0;
  58 }
  59
  60 /*
  61  * control element info
  62  * it uses union, so the things are not easy..
  63  */
  64
  65 struct snd_ctl_elem_info32 {
  66         struct snd_ctl_elem_id id; // the size of struct is same
  67         s32 type;
  68         u32 access;
  69         u32 count;
  70         s32 owner;
  71         union {
  72                 struct {
  73                         s32 min;
  74                         s32 max;
  75                         s32 step;
  76                 } integer;
  77                 struct {
  78                         u64 min;
  79                         u64 max;
  80                         u64 step;
  81                 } integer64;
  82                 struct {
  83                         u32 items;
  84                         u32 item;
  85                         char name[64];
  86                         u64 names_ptr;
  87                         u32 names_length;
  88                 } enumerated;
  89                 unsigned char reserved[128];
  90         } value;
  91         unsigned char reserved[64];
  92 } __attribute__((packed));
  93
  94 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
  95                                     struct snd_ctl_elem_info32 __user *data32)
  96 {
  97         struct snd_ctl_elem_info *data;
  98         int err;
  99
 100         data = kzalloc(sizeof(*data), GFP_KERNEL);
 101         if (! data)
 102                 return -ENOMEM;
 103
 104         err = -EFAULT;
 105         /* copy id */
 106         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
 107                 goto error;
 108         /* we need to copy the item index.
 109          * hope this doesn't break anything..
 110          */
 111         if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
 112                 goto error;
 113
 114         err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
 115         if (err < 0)
 116                 goto error;
 117         err = snd_ctl_elem_info(ctl, data);
 118         if (err < 0)
 119                 goto error;
 120         /* restore info to 32bit */
 121         err = -EFAULT;
 122         /* id, type, access, count */
 123         if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
 124             copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
 125                 goto error;
 126         if (put_user(data->owner, &data32->owner))
 127                 goto error;
 128         switch (data->type) {
 129         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
 130         case SNDRV_CTL_ELEM_TYPE_INTEGER:
 131                 if (put_user(data->value.integer.min, &data32->value.integer.min) ||
 132                     put_user(data->value.integer.max, &data32->value.integer.max) ||
 133                     put_user(data->value.integer.step, &data32->value.integer.step))
 134                         goto error;
 135                 break;
 136         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
 137                 if (copy_to_user(&data32->value.integer64,
 138                                  &data->value.integer64,
 139                                  sizeof(data->value.integer64)))
 140                         goto error;
 141                 break;
 142         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
 143                 if (copy_to_user(&data32->value.enumerated,
 144                                  &data->value.enumerated,
 145                                  sizeof(data->value.enumerated)))
 146                         goto error;
 147                 break;
 148         default:
 149                 break;
 150         }
 151         err = 0;
 152  error:
 153         kfree(data);
 154         return err;
 155 }
 156
 157 /* read / write */
 158 struct snd_ctl_elem_value32 {
 159         struct snd_ctl_elem_id id;
 160         unsigned int indirect;  /* bit-field causes misalignment */
 161         union {
 162                 s32 integer[128];
 163                 unsigned char data[512];
 164 #ifndef CONFIG_X86_64
 165                 s64 integer64[64];
 166 #endif
 167         } value;
 168         unsigned char reserved[128];
 169 };
 170
 171 #ifdef CONFIG_X86_X32
 172 /* x32 has a different alignment for 64bit values from ia32 */
 173 struct snd_ctl_elem_value_x32 {
 174         struct snd_ctl_elem_id id;
 175         unsigned int indirect;  /* bit-field causes misalignment */
 176         union {
 177                 s32 integer[128];
 178                 unsigned char data[512];
 179                 s64 integer64[64];
 180         } value;
 181         unsigned char reserved[128];
 182 };
 183 #endif /* CONFIG_X86_X32 */
 184
 185 /* get the value type and count of the control */
 186 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
 187                         int *countp)
 188 {
 189         struct snd_kcontrol *kctl;
 190         struct snd_ctl_elem_info *info;
 191         int err;
 192
 193         down_read(&card->controls_rwsem);
 194         kctl = snd_ctl_find_id(card, id);
 195         if (! kctl) {
 196                 up_read(&card->controls_rwsem);
 197                 return -ENOENT;
 198         }
 199         info = kzalloc(sizeof(*info), GFP_KERNEL);
 200         if (info == NULL) {
 201                 up_read(&card->controls_rwsem);
 202                 return -ENOMEM;
 203         }
 204         info->id = *id;
 205         err = kctl->info(kctl, info);
 206         up_read(&card->controls_rwsem);
 207         if (err >= 0) {
 208                 err = info->type;
 209                 *countp = info->count;
 210         }
 211         kfree(info);
 212         return err;
 213 }
 214
 215 static int get_elem_size(int type, int count)
 216 {
 217         switch (type) {
 218         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
 219                 return sizeof(s64) * count;
 220         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
 221                 return sizeof(int) * count;
 222         case SNDRV_CTL_ELEM_TYPE_BYTES:
 223                 return 512;
 224         case SNDRV_CTL_ELEM_TYPE_IEC958:
 225                 return sizeof(struct snd_aes_iec958);
 226         default:
 227                 return -1;
 228         }
 229 }
 230
 231 static int copy_ctl_value_from_user(struct snd_card *card,
 232                                     struct snd_ctl_elem_value *data,
 233                                     void __user *userdata,
 234                                     void __user *valuep,
 235                                     int *typep, int *countp)
 236 {
 237         struct snd_ctl_elem_value32 __user *data32 = userdata;
 238         int i, type, size;
 239         int uninitialized_var(count);
 240         unsigned int indirect;
 241
 242         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
 243                 return -EFAULT;
 244         if (get_user(indirect, &data32->indirect))
 245                 return -EFAULT;
 246         if (indirect)
 247                 return -EINVAL;
 248         type = get_ctl_type(card, &data->id, &count);
 249         if (type < 0)
 250                 return type;
 251
 252         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
 253             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
 254                 for (i = 0; i < count; i++) {
 255                         s32 __user *intp = valuep;
 256                         int val;
 257                         if (get_user(val, &intp[i]))
 258                                 return -EFAULT;
 259                         data->value.integer.value[i] = val;
 260                 }
 261         } else {
 262                 size = get_elem_size(type, count);
 263                 if (size < 0) {
 264                         dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
 265                         return -EINVAL;
 266                 }
 267                 if (copy_from_user(data->value.bytes.data, valuep, size))
 268                         return -EFAULT;
 269         }
 270
 271         *typep = type;
 272         *countp = count;
 273         return 0;
 274 }
 275
 276 /* restore the value to 32bit */
 277 static int copy_ctl_value_to_user(void __user *userdata,
 278                                   void __user *valuep,
 279                                   struct snd_ctl_elem_value *data,
 280                                   int type, int count)
 281 {
 282         int i, size;
 283
 284         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
 285             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
 286                 for (i = 0; i < count; i++) {
 287                         s32 __user *intp = valuep;
 288                         int val;
 289                         val = data->value.integer.value[i];
 290                         if (put_user(val, &intp[i]))
 291                                 return -EFAULT;
 292                 }
 293         } else {
 294                 size = get_elem_size(type, count);
 295                 if (copy_to_user(valuep, data->value.bytes.data, size))
 296                         return -EFAULT;
 297         }
 298         return 0;
 299 }
 300
 301 static int ctl_elem_read_user(struct snd_card *card,
 302                               void __user *userdata, void __user *valuep)
 303 {
 304         struct snd_ctl_elem_value *data;
 305         int err, type, count;
 306
 307         data = kzalloc(sizeof(*data), GFP_KERNEL);
 308         if (data == NULL)
 309                 return -ENOMEM;
 310
 311         err = copy_ctl_value_from_user(card, data, userdata, valuep,
 312                                        &type, &count);
 313         if (err < 0)
 314                 goto error;
 315
 316         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
 317         if (err < 0)
 318                 goto error;
 319         err = snd_ctl_elem_read(card, data);
 320         if (err < 0)
 321                 goto error;
 322         err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
 323  error:
 324         kfree(data);
 325         return err;
 326 }
 327
 328 static int ctl_elem_write_user(struct snd_ctl_file *file,
 329                                void __user *userdata, void __user *valuep)
 330 {
 331         struct snd_ctl_elem_value *data;
 332         struct snd_card *card = file->card;
 333         int err, type, count;
 334
 335         data = kzalloc(sizeof(*data), GFP_KERNEL);
 336         if (data == NULL)
 337                 return -ENOMEM;
 338
 339         err = copy_ctl_value_from_user(card, data, userdata, valuep,
 340                                        &type, &count);
 341         if (err < 0)
 342                 goto error;
 343
 344         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
 345         if (err < 0)
 346                 goto error;
 347         err = snd_ctl_elem_write(card, file, data);
 348         if (err < 0)
 349                 goto error;
 350         err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
 351  error:
 352         kfree(data);
 353         return err;
 354 }
 355
 356 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
 357                                          struct snd_ctl_elem_value32 __user *data32)
 358 {
 359         return ctl_elem_read_user(card, data32, &data32->value);
 360 }
 361
 362 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
 363                                           struct snd_ctl_elem_value32 __user *data32)
 364 {
 365         return ctl_elem_write_user(file, data32, &data32->value);
 366 }
 367
 368 #ifdef CONFIG_X86_X32
 369 static int snd_ctl_elem_read_user_x32(struct snd_card *card,
 370                                       struct snd_ctl_elem_value_x32 __user *data32)
 371 {
 372         return ctl_elem_read_user(card, data32, &data32->value);
 373 }
 374
 375 static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
 376                                        struct snd_ctl_elem_value_x32 __user *data32)
 377 {
 378         return ctl_elem_write_user(file, data32, &data32->value);
 379 }
 380 #endif /* CONFIG_X86_X32 */
 381
 382 /* add or replace a user control */
 383 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
 384                                    struct snd_ctl_elem_info32 __user *data32,
 385                                    int replace)
 386 {
 387         struct snd_ctl_elem_info *data;
 388         int err;
 389
 390         data = kzalloc(sizeof(*data), GFP_KERNEL);
 391         if (! data)
 392                 return -ENOMEM;
 393
 394         err = -EFAULT;
 395         /* id, type, access, count */ \
 396         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
 397             copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
 398                 goto error;
 399         if (get_user(data->owner, &data32->owner))
 400                 goto error;
 401         switch (data->type) {
 402         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
 403         case SNDRV_CTL_ELEM_TYPE_INTEGER:
 404                 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
 405                     get_user(data->value.integer.max, &data32->value.integer.max) ||
 406                     get_user(data->value.integer.step, &data32->value.integer.step))
 407                         goto error;
 408                 break;
 409         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
 410                 if (copy_from_user(&data->value.integer64,
 411                                    &data32->value.integer64,
 412                                    sizeof(data->value.integer64)))
 413                         goto error;
 414                 break;
 415         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
 416                 if (copy_from_user(&data->value.enumerated,
 417                                    &data32->value.enumerated,
 418                                    sizeof(data->value.enumerated)))
 419                         goto error;
 420                 data->value.enumerated.names_ptr =
 421                         (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
 422                 break;
 423         default:
 424                 break;
 425         }
 426         err = snd_ctl_elem_add(file, data, replace);
 427  error:
 428         kfree(data);
 429         return err;
 430 }
 431
 432 enum {
 433         SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
 434         SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
 435         SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
 436         SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
 437         SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
 438         SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
 439 #ifdef CONFIG_X86_X32
 440         SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
 441         SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
 442 #endif /* CONFIG_X86_X32 */
 443 };
 444
 445 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 446 {
 447         struct snd_ctl_file *ctl;
 448         struct snd_kctl_ioctl *p;
 449         void __user *argp = compat_ptr(arg);
 450         int err;
 451
 452         ctl = file->private_data;
 453         if (snd_BUG_ON(!ctl || !ctl->card))
 454                 return -ENXIO;
 455
 456         switch (cmd) {
 457         case SNDRV_CTL_IOCTL_PVERSION:
 458         case SNDRV_CTL_IOCTL_CARD_INFO:
 459         case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
 460         case SNDRV_CTL_IOCTL_POWER:
 461         case SNDRV_CTL_IOCTL_POWER_STATE:
 462         case SNDRV_CTL_IOCTL_ELEM_LOCK:
 463         case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
 464         case SNDRV_CTL_IOCTL_ELEM_REMOVE:
 465         case SNDRV_CTL_IOCTL_TLV_READ:
 466         case SNDRV_CTL_IOCTL_TLV_WRITE:
 467         case SNDRV_CTL_IOCTL_TLV_COMMAND:
 468                 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
 469         case SNDRV_CTL_IOCTL_ELEM_LIST32:
 470                 return snd_ctl_elem_list_compat(ctl->card, argp);
 471         case SNDRV_CTL_IOCTL_ELEM_INFO32:
 472                 return snd_ctl_elem_info_compat(ctl, argp);
 473         case SNDRV_CTL_IOCTL_ELEM_READ32:
 474                 return snd_ctl_elem_read_user_compat(ctl->card, argp);
 475         case SNDRV_CTL_IOCTL_ELEM_WRITE32:
 476                 return snd_ctl_elem_write_user_compat(ctl, argp);
 477         case SNDRV_CTL_IOCTL_ELEM_ADD32:
 478                 return snd_ctl_elem_add_compat(ctl, argp, 0);
 479         case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
 480                 return snd_ctl_elem_add_compat(ctl, argp, 1);
 481 #ifdef CONFIG_X86_X32
 482         case SNDRV_CTL_IOCTL_ELEM_READ_X32:
 483                 return snd_ctl_elem_read_user_x32(ctl->card, argp);
 484         case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
 485                 return snd_ctl_elem_write_user_x32(ctl, argp);
 486 #endif /* CONFIG_X86_X32 */
 487         }
 488
 489         down_read(&snd_ioctl_rwsem);
 490         list_for_each_entry(p, &snd_control_compat_ioctls, list) {
 491                 if (p->fioctl) {
 492                         err = p->fioctl(ctl->card, ctl, cmd, arg);
 493                         if (err != -ENOIOCTLCMD) {
 494                                 up_read(&snd_ioctl_rwsem);
 495                                 return err;
 496                         }
 497                 }
 498         }
 499         up_read(&snd_ioctl_rwsem);
 500         return -ENOIOCTLCMD;
 501 }