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 } 449