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 25 struct snd_ctl_elem_list32 { 26 u32 offset; 27 u32 space; 28 u32 used; 29 u32 count; 30 u32 pids; 31 unsigned char reserved[50]; 32 } /* don't set packed attribute here */; 33 34 static int snd_ctl_elem_list_compat(struct snd_card *card, 35 struct snd_ctl_elem_list32 __user *data32) 36 { 37 struct snd_ctl_elem_list __user *data; 38 compat_caddr_t ptr; 39 int err; 40 41 data = compat_alloc_user_space(sizeof(*data)); 42 43 /* offset, space, used, count */ 44 if (copy_in_user(data, data32, 4 * sizeof(u32))) 45 return -EFAULT; 46 /* pids */ 47 if (get_user(ptr, &data32->pids) || 48 put_user(compat_ptr(ptr), &data->pids)) 49 return -EFAULT; 50 err = snd_ctl_elem_list(card, data); 51 if (err < 0) 52 return err; 53 /* copy the result */ 54 if (copy_in_user(data32, data, 4 * sizeof(u32))) 55 return -EFAULT; 56 return 0; 57 } 58 59 /* 60 * control element info 61 * it uses union, so the things are not easy.. 62 */ 63 64 struct snd_ctl_elem_info32 { 65 struct snd_ctl_elem_id id; // the size of struct is same 66 s32 type; 67 u32 access; 68 u32 count; 69 s32 owner; 70 union { 71 struct { 72 s32 min; 73 s32 max; 74 s32 step; 75 } integer; 76 struct { 77 u64 min; 78 u64 max; 79 u64 step; 80 } integer64; 81 struct { 82 u32 items; 83 u32 item; 84 char name[64]; 85 } enumerated; 86 unsigned char reserved[128]; 87 } value; 88 unsigned char reserved[64]; 89 } __attribute__((packed)); 90 91 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl, 92 struct snd_ctl_elem_info32 __user *data32) 93 { 94 struct snd_ctl_elem_info *data; 95 int err; 96 97 data = kzalloc(sizeof(*data), GFP_KERNEL); 98 if (! data) 99 return -ENOMEM; 100 101 err = -EFAULT; 102 /* copy id */ 103 if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) 104 goto error; 105 /* we need to copy the item index. 106 * hope this doesn't break anything.. 107 */ 108 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item)) 109 goto error; 110 err = snd_ctl_elem_info(ctl, data); 111 if (err < 0) 112 goto error; 113 /* restore info to 32bit */ 114 err = -EFAULT; 115 /* id, type, access, count */ 116 if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) || 117 copy_to_user(&data32->type, &data->type, 3 * sizeof(u32))) 118 goto error; 119 if (put_user(data->owner, &data32->owner)) 120 goto error; 121 switch (data->type) { 122 case SNDRV_CTL_ELEM_TYPE_BOOLEAN: 123 case SNDRV_CTL_ELEM_TYPE_INTEGER: 124 if (put_user(data->value.integer.min, &data32->value.integer.min) || 125 put_user(data->value.integer.max, &data32->value.integer.max) || 126 put_user(data->value.integer.step, &data32->value.integer.step)) 127 goto error; 128 break; 129 case SNDRV_CTL_ELEM_TYPE_INTEGER64: 130 if (copy_to_user(&data32->value.integer64, 131 &data->value.integer64, 132 sizeof(data->value.integer64))) 133 goto error; 134 break; 135 case SNDRV_CTL_ELEM_TYPE_ENUMERATED: 136 if (copy_to_user(&data32->value.enumerated, 137 &data->value.enumerated, 138 sizeof(data->value.enumerated))) 139 goto error; 140 break; 141 default: 142 break; 143 } 144 err = 0; 145 error: 146 kfree(data); 147 return err; 148 } 149 150 /* read / write */ 151 struct snd_ctl_elem_value32 { 152 struct snd_ctl_elem_id id; 153 unsigned int indirect; /* bit-field causes misalignment */ 154 union { 155 s32 integer[128]; 156 unsigned char data[512]; 157 #ifndef CONFIG_X86_64 158 s64 integer64[64]; 159 #endif 160 } value; 161 unsigned char reserved[128]; 162 }; 163 164 165 /* get the value type and count of the control */ 166 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, 167 int *countp) 168 { 169 struct snd_kcontrol *kctl; 170 struct snd_ctl_elem_info info; 171 int err; 172 173 down_read(&card->controls_rwsem); 174 kctl = snd_ctl_find_id(card, id); 175 if (! kctl) { 176 up_read(&card->controls_rwsem); 177 return -ENXIO; 178 } 179 info.id = *id; 180 err = kctl->info(kctl, &info); 181 up_read(&card->controls_rwsem); 182 if (err >= 0) { 183 err = info.type; 184 *countp = info.count; 185 } 186 return err; 187 } 188 189 static int get_elem_size(int type, int count) 190 { 191 switch (type) { 192 case SNDRV_CTL_ELEM_TYPE_INTEGER64: 193 return sizeof(s64) * count; 194 case SNDRV_CTL_ELEM_TYPE_ENUMERATED: 195 return sizeof(int) * count; 196 case SNDRV_CTL_ELEM_TYPE_BYTES: 197 return 512; 198 case SNDRV_CTL_ELEM_TYPE_IEC958: 199 return sizeof(struct snd_aes_iec958); 200 default: 201 return -1; 202 } 203 } 204 205 static int copy_ctl_value_from_user(struct snd_card *card, 206 struct snd_ctl_elem_value *data, 207 struct snd_ctl_elem_value32 __user *data32, 208 int *typep, int *countp) 209 { 210 int i, type, count, size; 211 unsigned int indirect; 212 213 if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) 214 return -EFAULT; 215 if (get_user(indirect, &data32->indirect)) 216 return -EFAULT; 217 if (indirect) 218 return -EINVAL; 219 type = get_ctl_type(card, &data->id, &count); 220 if (type < 0) 221 return type; 222 223 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || 224 type == SNDRV_CTL_ELEM_TYPE_INTEGER) { 225 for (i = 0; i < count; i++) { 226 int val; 227 if (get_user(val, &data32->value.integer[i])) 228 return -EFAULT; 229 data->value.integer.value[i] = val; 230 } 231 } else { 232 size = get_elem_size(type, count); 233 if (size < 0) { 234 printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type); 235 return -EINVAL; 236 } 237 if (copy_from_user(data->value.bytes.data, 238 data32->value.data, size)) 239 return -EFAULT; 240 } 241 242 *typep = type; 243 *countp = count; 244 return 0; 245 } 246 247 /* restore the value to 32bit */ 248 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32, 249 struct snd_ctl_elem_value *data, 250 int type, int count) 251 { 252 int i, size; 253 254 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || 255 type == SNDRV_CTL_ELEM_TYPE_INTEGER) { 256 for (i = 0; i < count; i++) { 257 int val; 258 val = data->value.integer.value[i]; 259 if (put_user(val, &data32->value.integer[i])) 260 return -EFAULT; 261 } 262 } else { 263 size = get_elem_size(type, count); 264 if (copy_to_user(data32->value.data, 265 data->value.bytes.data, size)) 266 return -EFAULT; 267 } 268 return 0; 269 } 270 271 static int snd_ctl_elem_read_user_compat(struct snd_card *card, 272 struct snd_ctl_elem_value32 __user *data32) 273 { 274 struct snd_ctl_elem_value *data; 275 int err, type, count; 276 277 data = kzalloc(sizeof(*data), GFP_KERNEL); 278 if (data == NULL) 279 return -ENOMEM; 280 281 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) 282 goto error; 283 if ((err = snd_ctl_elem_read(card, data)) < 0) 284 goto error; 285 err = copy_ctl_value_to_user(data32, data, type, count); 286 error: 287 kfree(data); 288 return err; 289 } 290 291 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file, 292 struct snd_ctl_elem_value32 __user *data32) 293 { 294 struct snd_ctl_elem_value *data; 295 int err, type, count; 296 297 data = kzalloc(sizeof(*data), GFP_KERNEL); 298 if (data == NULL) 299 return -ENOMEM; 300 301 if ((err = copy_ctl_value_from_user(file->card, data, data32, &type, &count)) < 0) 302 goto error; 303 if ((err = snd_ctl_elem_write(file->card, file, data)) < 0) 304 goto error; 305 err = copy_ctl_value_to_user(data32, data, type, count); 306 error: 307 kfree(data); 308 return err; 309 } 310 311 /* add or replace a user control */ 312 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, 313 struct snd_ctl_elem_info32 __user *data32, 314 int replace) 315 { 316 struct snd_ctl_elem_info *data; 317 int err; 318 319 data = kzalloc(sizeof(*data), GFP_KERNEL); 320 if (! data) 321 return -ENOMEM; 322 323 err = -EFAULT; 324 /* id, type, access, count */ \ 325 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) || 326 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32))) 327 goto error; 328 if (get_user(data->owner, &data32->owner) || 329 get_user(data->type, &data32->type)) 330 goto error; 331 switch (data->type) { 332 case SNDRV_CTL_ELEM_TYPE_BOOLEAN: 333 case SNDRV_CTL_ELEM_TYPE_INTEGER: 334 if (get_user(data->value.integer.min, &data32->value.integer.min) || 335 get_user(data->value.integer.max, &data32->value.integer.max) || 336 get_user(data->value.integer.step, &data32->value.integer.step)) 337 goto error; 338 break; 339 case SNDRV_CTL_ELEM_TYPE_INTEGER64: 340 if (copy_from_user(&data->value.integer64, 341 &data32->value.integer64, 342 sizeof(data->value.integer64))) 343 goto error; 344 break; 345 case SNDRV_CTL_ELEM_TYPE_ENUMERATED: 346 if (copy_from_user(&data->value.enumerated, 347 &data32->value.enumerated, 348 sizeof(data->value.enumerated))) 349 goto error; 350 break; 351 default: 352 break; 353 } 354 err = snd_ctl_elem_add(file, data, replace); 355 error: 356 kfree(data); 357 return err; 358 } 359 360 enum { 361 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32), 362 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32), 363 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32), 364 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32), 365 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32), 366 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32), 367 }; 368 369 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 370 { 371 struct snd_ctl_file *ctl; 372 struct list_head *list; 373 void __user *argp = compat_ptr(arg); 374 int err; 375 376 ctl = file->private_data; 377 snd_assert(ctl && ctl->card, return -ENXIO); 378 379 switch (cmd) { 380 case SNDRV_CTL_IOCTL_PVERSION: 381 case SNDRV_CTL_IOCTL_CARD_INFO: 382 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: 383 case SNDRV_CTL_IOCTL_POWER: 384 case SNDRV_CTL_IOCTL_POWER_STATE: 385 case SNDRV_CTL_IOCTL_ELEM_LOCK: 386 case SNDRV_CTL_IOCTL_ELEM_UNLOCK: 387 return snd_ctl_ioctl(file, cmd, (unsigned long)argp); 388 case SNDRV_CTL_IOCTL_ELEM_LIST32: 389 return snd_ctl_elem_list_compat(ctl->card, argp); 390 case SNDRV_CTL_IOCTL_ELEM_INFO32: 391 return snd_ctl_elem_info_compat(ctl, argp); 392 case SNDRV_CTL_IOCTL_ELEM_READ32: 393 return snd_ctl_elem_read_user_compat(ctl->card, argp); 394 case SNDRV_CTL_IOCTL_ELEM_WRITE32: 395 return snd_ctl_elem_write_user_compat(ctl, argp); 396 case SNDRV_CTL_IOCTL_ELEM_ADD32: 397 return snd_ctl_elem_add_compat(ctl, argp, 0); 398 case SNDRV_CTL_IOCTL_ELEM_REPLACE32: 399 return snd_ctl_elem_add_compat(ctl, argp, 1); 400 } 401 402 down_read(&snd_ioctl_rwsem); 403 list_for_each(list, &snd_control_compat_ioctls) { 404 struct snd_kctl_ioctl *p = list_entry(list, struct snd_kctl_ioctl, list); 405 if (p->fioctl) { 406 err = p->fioctl(ctl->card, ctl, cmd, arg); 407 if (err != -ENOIOCTLCMD) { 408 up_read(&snd_ioctl_rwsem); 409 return err; 410 } 411 } 412 } 413 up_read(&snd_ioctl_rwsem); 414 return -ENOIOCTLCMD; 415 } 416