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         snd_power_lock(ctl->card);
 115         err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
 116         if (err >= 0)
 117                 err = snd_ctl_elem_info(ctl, data);
 118         snd_power_unlock(ctl->card);
 119
 120         if (err < 0)
 121                 goto error;
 122         /* restore info to 32bit */
 123         err = -EFAULT;
 124         /* id, type, access, count */
 125         if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
 126             copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
 127                 goto error;
 128         if (put_user(data->owner, &data32->owner))
 129                 goto error;
 130         switch (data->type) {
 131         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
 132         case SNDRV_CTL_ELEM_TYPE_INTEGER:
 133                 if (put_user(data->value.integer.min, &data32->value.integer.min) ||
 134                     put_user(data->value.integer.max, &data32->value.integer.max) ||
 135                     put_user(data->value.integer.step, &data32->value.integer.step))
 136                         goto error;
 137                 break;
 138         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
 139                 if (copy_to_user(&data32->value.integer64,
 140                                  &data->value.integer64,
 141                                  sizeof(data->value.integer64)))
 142                         goto error;
 143                 break;
 144         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
 145                 if (copy_to_user(&data32->value.enumerated,
 146                                  &data->value.enumerated,
 147                                  sizeof(data->value.enumerated)))
 148                         goto error;
 149                 break;
 150         default:
 151                 break;
 152         }
 153         err = 0;
 154  error:
 155         kfree(data);
 156         return err;
 157 }
 158
 159 /* read / write */
 160 struct snd_ctl_elem_value32 {
 161         struct snd_ctl_elem_id id;
 162         unsigned int indirect;  /* bit-field causes misalignment */
 163         union {
 164                 s32 integer[128];
 165                 unsigned char data[512];
 166 #ifndef CONFIG_X86_64
 167                 s64 integer64[64];
 168 #endif
 169         } value;
 170         unsigned char reserved[128];
 171 };
 172
 173
 174 /* get the value type and count of the control */
 175 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
 176                         int *countp)
 177 {
 178         struct snd_kcontrol *kctl;
 179         struct snd_ctl_elem_info *info;
 180         int err;
 181
 182         down_read(&card->controls_rwsem);
 183         kctl = snd_ctl_find_id(card, id);
 184         if (! kctl) {
 185                 up_read(&card->controls_rwsem);
 186                 return -ENXIO;
 187         }
 188         info = kzalloc(sizeof(*info), GFP_KERNEL);
 189         if (info == NULL) {
 190                 up_read(&card->controls_rwsem);
 191                 return -ENOMEM;
 192         }
 193         info->id = *id;
 194         err = kctl->info(kctl, info);
 195         up_read(&card->controls_rwsem);
 196         if (err >= 0) {
 197                 err = info->type;
 198                 *countp = info->count;
 199         }
 200         kfree(info);
 201         return err;
 202 }
 203
 204 static int get_elem_size(int type, int count)
 205 {
 206         switch (type) {
 207         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
 208                 return sizeof(s64) * count;
 209         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
 210                 return sizeof(int) * count;
 211         case SNDRV_CTL_ELEM_TYPE_BYTES:
 212                 return 512;
 213         case SNDRV_CTL_ELEM_TYPE_IEC958:
 214                 return sizeof(struct snd_aes_iec958);
 215         default:
 216                 return -1;
 217         }
 218 }
 219
 220 static int copy_ctl_value_from_user(struct snd_card *card,
 221                                     struct snd_ctl_elem_value *data,
 222                                     struct snd_ctl_elem_value32 __user *data32,
 223                                     int *typep, int *countp)
 224 {
 225         int i, type, size;
 226         int uninitialized_var(count);
 227         unsigned int indirect;
 228
 229         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
 230                 return -EFAULT;
 231         if (get_user(indirect, &data32->indirect))
 232                 return -EFAULT;
 233         if (indirect)
 234                 return -EINVAL;
 235         type = get_ctl_type(card, &data->id, &count);
 236         if (type < 0)
 237                 return type;
 238
 239         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
 240             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
 241                 for (i = 0; i < count; i++) {
 242                         int val;
 243                         if (get_user(val, &data32->value.integer[i]))
 244                                 return -EFAULT;
 245                         data->value.integer.value[i] = val;
 246                 }
 247         } else {
 248                 size = get_elem_size(type, count);
 249                 if (size < 0) {
 250                         printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
 251                         return -EINVAL;
 252                 }
 253                 if (copy_from_user(data->value.bytes.data,
 254                                    data32->value.data, size))
 255                         return -EFAULT;
 256         }
 257
 258         *typep = type;
 259         *countp = count;
 260         return 0;
 261 }
 262
 263 /* restore the value to 32bit */
 264 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
 265                                   struct snd_ctl_elem_value *data,
 266                                   int type, int count)
 267 {
 268         int i, size;
 269
 270         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
 271             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
 272                 for (i = 0; i < count; i++) {
 273                         int val;
 274                         val = data->value.integer.value[i];
 275                         if (put_user(val, &data32->value.integer[i]))
 276                                 return -EFAULT;
 277                 }
 278         } else {
 279                 size = get_elem_size(type, count);
 280                 if (copy_to_user(data32->value.data,
 281                                  data->value.bytes.data, size))
 282                         return -EFAULT;
 283         }
 284         return 0;
 285 }
 286
 287 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
 288                                          struct snd_ctl_elem_value32 __user *data32)
 289 {
 290         struct snd_ctl_elem_value *data;
 291         int err, type, count;
 292
 293         data = kzalloc(sizeof(*data), GFP_KERNEL);
 294         if (data == NULL)
 295                 return -ENOMEM;
 296
 297         if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
 298                 goto error;
 299
 300         snd_power_lock(card);
 301         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
 302         if (err >= 0)
 303                 err = snd_ctl_elem_read(card, data);
 304         snd_power_unlock(card);
 305         if (err >= 0)
 306                 err = copy_ctl_value_to_user(data32, data, type, count);
 307  error:
 308         kfree(data);
 309         return err;
 310 }
 311
 312 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
 313                                           struct snd_ctl_elem_value32 __user *data32)
 314 {
 315         struct snd_ctl_elem_value *data;
 316         struct snd_card *card = file->card;
 317         int err, type, count;
 318
 319         data = kzalloc(sizeof(*data), GFP_KERNEL);
 320         if (data == NULL)
 321                 return -ENOMEM;
 322
 323         if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
 324                 goto error;
 325
 326         snd_power_lock(card);
 327         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
 328         if (err >= 0)
 329                 err = snd_ctl_elem_write(card, file, data);
 330         snd_power_unlock(card);
 331         if (err >= 0)
 332                 err = copy_ctl_value_to_user(data32, data, type, count);
 333  error:
 334         kfree(data);
 335         return err;
 336 }
 337
 338 /* add or replace a user control */
 339 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
 340                                    struct snd_ctl_elem_info32 __user *data32,
 341                                    int replace)
 342 {
 343         struct snd_ctl_elem_info *data;
 344         int err;
 345
 346         data = kzalloc(sizeof(*data), GFP_KERNEL);
 347         if (! data)
 348                 return -ENOMEM;
 349
 350         err = -EFAULT;
 351         /* id, type, access, count */ \
 352         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
 353             copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
 354                 goto error;
 355         if (get_user(data->owner, &data32->owner) ||
 356             get_user(data->type, &data32->type))
 357                 goto error;
 358         switch (data->type) {
 359         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
 360         case SNDRV_CTL_ELEM_TYPE_INTEGER:
 361                 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
 362                     get_user(data->value.integer.max, &data32->value.integer.max) ||
 363                     get_user(data->value.integer.step, &data32->value.integer.step))
 364                         goto error;
 365                 break;
 366         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
 367                 if (copy_from_user(&data->value.integer64,
 368                                    &data32->value.integer64,
 369                                    sizeof(data->value.integer64)))
 370                         goto error;
 371                 break;
 372         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
 373                 if (copy_from_user(&data->value.enumerated,
 374                                    &data32->value.enumerated,
 375                                    sizeof(data->value.enumerated)))
 376                         goto error;
 377                 data->value.enumerated.names_ptr =
 378                         (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
 379                 break;
 380         default:
 381                 break;
 382         }
 383         err = snd_ctl_elem_add(file, data, replace);
 384  error:
 385         kfree(data);
 386         return err;
 387 }
 388
 389 enum {
 390         SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
 391         SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
 392         SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
 393         SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
 394         SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
 395         SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
 396 };
 397
 398 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 399 {
 400         struct snd_ctl_file *ctl;
 401         struct snd_kctl_ioctl *p;
 402         void __user *argp = compat_ptr(arg);
 403         int err;
 404
 405         ctl = file->private_data;
 406         if (snd_BUG_ON(!ctl || !ctl->card))
 407                 return -ENXIO;
 408
 409         switch (cmd) {
 410         case SNDRV_CTL_IOCTL_PVERSION:
 411         case SNDRV_CTL_IOCTL_CARD_INFO:
 412         case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
 413         case SNDRV_CTL_IOCTL_POWER:
 414         case SNDRV_CTL_IOCTL_POWER_STATE:
 415         case SNDRV_CTL_IOCTL_ELEM_LOCK:
 416         case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
 417         case SNDRV_CTL_IOCTL_ELEM_REMOVE:
 418         case SNDRV_CTL_IOCTL_TLV_READ:
 419         case SNDRV_CTL_IOCTL_TLV_WRITE:
 420         case SNDRV_CTL_IOCTL_TLV_COMMAND:
 421                 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
 422         case SNDRV_CTL_IOCTL_ELEM_LIST32:
 423                 return snd_ctl_elem_list_compat(ctl->card, argp);
 424         case SNDRV_CTL_IOCTL_ELEM_INFO32:
 425                 return snd_ctl_elem_info_compat(ctl, argp);
 426         case SNDRV_CTL_IOCTL_ELEM_READ32:
 427                 return snd_ctl_elem_read_user_compat(ctl->card, argp);
 428         case SNDRV_CTL_IOCTL_ELEM_WRITE32:
 429                 return snd_ctl_elem_write_user_compat(ctl, argp);
 430         case SNDRV_CTL_IOCTL_ELEM_ADD32:
 431                 return snd_ctl_elem_add_compat(ctl, argp, 0);
 432         case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
 433                 return snd_ctl_elem_add_compat(ctl, argp, 1);
 434         }
 435
 436         down_read(&snd_ioctl_rwsem);
 437         list_for_each_entry(p, &snd_control_compat_ioctls, list) {
 438                 if (p->fioctl) {
 439                         err = p->fioctl(ctl->card, ctl, cmd, arg);
 440                         if (err != -ENOIOCTLCMD) {
 441                                 up_read(&snd_ioctl_rwsem);
 442                                 return err;
 443                         }
 444                 }
 445         }
 446         up_read(&snd_ioctl_rwsem);
 447         return -ENOIOCTLCMD;
 448 }