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                 } enumerated;
  87                 unsigned char reserved[128];
  88         } value;
  89         unsigned char reserved[64];
  90 } __attribute__((packed));
  91
  92 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
  93                                     struct snd_ctl_elem_info32 __user *data32)
  94 {
  95         struct snd_ctl_elem_info *data;
  96         int err;
  97
  98         data = kzalloc(sizeof(*data), GFP_KERNEL);
  99         if (! data)
 100                 return -ENOMEM;
 101
 102         err = -EFAULT;
 103         /* copy id */
 104         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
 105                 goto error;
 106         /* we need to copy the item index.
 107          * hope this doesn't break anything..
 108          */
 109         if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
 110                 goto error;
 111
 112         snd_power_lock(ctl->card);
 113         err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
 114         if (err >= 0)
 115                 err = snd_ctl_elem_info(ctl, data);
 116         snd_power_unlock(ctl->card);
 117
 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
 172 /* get the value type and count of the control */
 173 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
 174                         int *countp)
 175 {
 176         struct snd_kcontrol *kctl;
 177         struct snd_ctl_elem_info *info;
 178         int err;
 179
 180         down_read(&card->controls_rwsem);
 181         kctl = snd_ctl_find_id(card, id);
 182         if (! kctl) {
 183                 up_read(&card->controls_rwsem);
 184                 return -ENXIO;
 185         }
 186         info = kzalloc(sizeof(*info), GFP_KERNEL);
 187         if (info == NULL) {
 188                 up_read(&card->controls_rwsem);
 189                 return -ENOMEM;
 190         }
 191         info->id = *id;
 192         err = kctl->info(kctl, info);
 193         up_read(&card->controls_rwsem);
 194         if (err >= 0) {
 195                 err = info->type;
 196                 *countp = info->count;
 197         }
 198         kfree(info);
 199         return err;
 200 }
 201
 202 static int get_elem_size(int type, int count)
 203 {
 204         switch (type) {
 205         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
 206                 return sizeof(s64) * count;
 207         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
 208                 return sizeof(int) * count;
 209         case SNDRV_CTL_ELEM_TYPE_BYTES:
 210                 return 512;
 211         case SNDRV_CTL_ELEM_TYPE_IEC958:
 212                 return sizeof(struct snd_aes_iec958);
 213         default:
 214                 return -1;
 215         }
 216 }
 217
 218 static int copy_ctl_value_from_user(struct snd_card *card,
 219                                     struct snd_ctl_elem_value *data,
 220                                     struct snd_ctl_elem_value32 __user *data32,
 221                                     int *typep, int *countp)
 222 {
 223         int i, type, size;
 224         int uninitialized_var(count);
 225         unsigned int indirect;
 226
 227         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
 228                 return -EFAULT;
 229         if (get_user(indirect, &data32->indirect))
 230                 return -EFAULT;
 231         if (indirect)
 232                 return -EINVAL;
 233         type = get_ctl_type(card, &data->id, &count);
 234         if (type < 0)
 235                 return type;
 236
 237         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
 238             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
 239                 for (i = 0; i < count; i++) {
 240                         int val;
 241                         if (get_user(val, &data32->value.integer[i]))
 242                                 return -EFAULT;
 243                         data->value.integer.value[i] = val;
 244                 }
 245         } else {
 246                 size = get_elem_size(type, count);
 247                 if (size < 0) {
 248                         printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
 249                         return -EINVAL;
 250                 }
 251                 if (copy_from_user(data->value.bytes.data,
 252                                    data32->value.data, size))
 253                         return -EFAULT;
 254         }
 255
 256         *typep = type;
 257         *countp = count;
 258         return 0;
 259 }
 260
 261 /* restore the value to 32bit */
 262 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
 263                                   struct snd_ctl_elem_value *data,
 264                                   int type, int count)
 265 {
 266         int i, size;
 267
 268         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
 269             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
 270                 for (i = 0; i < count; i++) {
 271                         int val;
 272                         val = data->value.integer.value[i];
 273                         if (put_user(val, &data32->value.integer[i]))
 274                                 return -EFAULT;
 275                 }
 276         } else {
 277                 size = get_elem_size(type, count);
 278                 if (copy_to_user(data32->value.data,
 279                                  data->value.bytes.data, size))
 280                         return -EFAULT;
 281         }
 282         return 0;
 283 }
 284
 285 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
 286                                          struct snd_ctl_elem_value32 __user *data32)
 287 {
 288         struct snd_ctl_elem_value *data;
 289         int err, type, count;
 290
 291         data = kzalloc(sizeof(*data), GFP_KERNEL);
 292         if (data == NULL)
 293                 return -ENOMEM;
 294
 295         if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
 296                 goto error;
 297
 298         snd_power_lock(card);
 299         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
 300         if (err >= 0)
 301                 err = snd_ctl_elem_read(card, data);
 302         snd_power_unlock(card);
 303         if (err >= 0)
 304                 err = copy_ctl_value_to_user(data32, data, type, count);
 305  error:
 306         kfree(data);
 307         return err;
 308 }
 309
 310 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
 311                                           struct snd_ctl_elem_value32 __user *data32)
 312 {
 313         struct snd_ctl_elem_value *data;
 314         struct snd_card *card = file->card;
 315         int err, type, count;
 316
 317         data = kzalloc(sizeof(*data), GFP_KERNEL);
 318         if (data == NULL)
 319                 return -ENOMEM;
 320
 321         if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
 322                 goto error;
 323
 324         snd_power_lock(card);
 325         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
 326         if (err >= 0)
 327                 err = snd_ctl_elem_write(card, file, data);
 328         snd_power_unlock(card);
 329         if (err >= 0)
 330                 err = copy_ctl_value_to_user(data32, data, type, count);
 331  error:
 332         kfree(data);
 333         return err;
 334 }
 335
 336 /* add or replace a user control */
 337 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
 338                                    struct snd_ctl_elem_info32 __user *data32,
 339                                    int replace)
 340 {
 341         struct snd_ctl_elem_info *data;
 342         int err;
 343
 344         data = kzalloc(sizeof(*data), GFP_KERNEL);
 345         if (! data)
 346                 return -ENOMEM;
 347
 348         err = -EFAULT;
 349         /* id, type, access, count */ \
 350         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
 351             copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
 352                 goto error;
 353         if (get_user(data->owner, &data32->owner) ||
 354             get_user(data->type, &data32->type))
 355                 goto error;
 356         switch (data->type) {
 357         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
 358         case SNDRV_CTL_ELEM_TYPE_INTEGER:
 359                 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
 360                     get_user(data->value.integer.max, &data32->value.integer.max) ||
 361                     get_user(data->value.integer.step, &data32->value.integer.step))
 362                         goto error;
 363                 break;
 364         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
 365                 if (copy_from_user(&data->value.integer64,
 366                                    &data32->value.integer64,
 367                                    sizeof(data->value.integer64)))
 368                         goto error;
 369                 break;
 370         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
 371                 if (copy_from_user(&data->value.enumerated,
 372                                    &data32->value.enumerated,
 373                                    sizeof(data->value.enumerated)))
 374                         goto error;
 375                 break;
 376         default:
 377                 break;
 378         }
 379         err = snd_ctl_elem_add(file, data, replace);
 380  error:
 381         kfree(data);
 382         return err;
 383 }
 384
 385 enum {
 386         SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
 387         SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
 388         SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
 389         SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
 390         SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
 391         SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
 392 };
 393
 394 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 395 {
 396         struct snd_ctl_file *ctl;
 397         struct snd_kctl_ioctl *p;
 398         void __user *argp = compat_ptr(arg);
 399         int err;
 400
 401         ctl = file->private_data;
 402         if (snd_BUG_ON(!ctl || !ctl->card))
 403                 return -ENXIO;
 404
 405         switch (cmd) {
 406         case SNDRV_CTL_IOCTL_PVERSION:
 407         case SNDRV_CTL_IOCTL_CARD_INFO:
 408         case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
 409         case SNDRV_CTL_IOCTL_POWER:
 410         case SNDRV_CTL_IOCTL_POWER_STATE:
 411         case SNDRV_CTL_IOCTL_ELEM_LOCK:
 412         case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
 413         case SNDRV_CTL_IOCTL_ELEM_REMOVE:
 414         case SNDRV_CTL_IOCTL_TLV_READ:
 415         case SNDRV_CTL_IOCTL_TLV_WRITE:
 416         case SNDRV_CTL_IOCTL_TLV_COMMAND:
 417                 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
 418         case SNDRV_CTL_IOCTL_ELEM_LIST32:
 419                 return snd_ctl_elem_list_compat(ctl->card, argp);
 420         case SNDRV_CTL_IOCTL_ELEM_INFO32:
 421                 return snd_ctl_elem_info_compat(ctl, argp);
 422         case SNDRV_CTL_IOCTL_ELEM_READ32:
 423                 return snd_ctl_elem_read_user_compat(ctl->card, argp);
 424         case SNDRV_CTL_IOCTL_ELEM_WRITE32:
 425                 return snd_ctl_elem_write_user_compat(ctl, argp);
 426         case SNDRV_CTL_IOCTL_ELEM_ADD32:
 427                 return snd_ctl_elem_add_compat(ctl, argp, 0);
 428         case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
 429                 return snd_ctl_elem_add_compat(ctl, argp, 1);
 430         }
 431
 432         down_read(&snd_ioctl_rwsem);
 433         list_for_each_entry(p, &snd_control_compat_ioctls, list) {
 434                 if (p->fioctl) {
 435                         err = p->fioctl(ctl->card, ctl, cmd, arg);
 436                         if (err != -ENOIOCTLCMD) {
 437                                 up_read(&snd_ioctl_rwsem);
 438                                 return err;
 439                         }
 440                 }
 441         }
 442         up_read(&snd_ioctl_rwsem);
 443         return -ENOIOCTLCMD;
 444 }