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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 | // SPDX-License-Identifier: GPL-2.0-or-later /* * compat ioctls for control API * * Copyright (c) by Takashi Iwai <tiwai@suse.de> */ /* this file included from control.c */ #include <linux/compat.h> #include <linux/slab.h> struct snd_ctl_elem_list32 { u32 offset; u32 space; u32 used; u32 count; u32 pids; unsigned char reserved[50]; } /* don't set packed attribute here */; static int snd_ctl_elem_list_compat(struct snd_card *card, struct snd_ctl_elem_list32 __user *data32) { struct snd_ctl_elem_list data = {}; compat_caddr_t ptr; int err; /* offset, space, used, count */ if (copy_from_user(&data, data32, 4 * sizeof(u32))) return -EFAULT; /* pids */ if (get_user(ptr, &data32->pids)) return -EFAULT; data.pids = compat_ptr(ptr); err = snd_ctl_elem_list(card, &data); if (err < 0) return err; /* copy the result */ if (copy_to_user(data32, &data, 4 * sizeof(u32))) return -EFAULT; return 0; } /* * control element info * it uses union, so the things are not easy.. */ struct snd_ctl_elem_info32 { struct snd_ctl_elem_id id; // the size of struct is same s32 type; u32 access; u32 count; s32 owner; union { struct { s32 min; s32 max; s32 step; } integer; struct { u64 min; u64 max; u64 step; } integer64; struct { u32 items; u32 item; char name[64]; u64 names_ptr; u32 names_length; } enumerated; unsigned char reserved[128]; } value; unsigned char reserved[64]; } __attribute__((packed)); static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl, struct snd_ctl_elem_info32 __user *data32) { struct snd_ctl_elem_info *data; int err; data = kzalloc(sizeof(*data), GFP_KERNEL); if (! data) return -ENOMEM; err = -EFAULT; /* copy id */ if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) goto error; /* we need to copy the item index. * hope this doesn't break anything.. */ if (get_user(data->value.enumerated.item, &data32->value.enumerated.item)) goto error; err = snd_ctl_elem_info(ctl, data); if (err < 0) goto error; /* restore info to 32bit */ err = -EFAULT; /* id, type, access, count */ if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) || copy_to_user(&data32->type, &data->type, 3 * sizeof(u32))) goto error; if (put_user(data->owner, &data32->owner)) goto error; switch (data->type) { case SNDRV_CTL_ELEM_TYPE_BOOLEAN: case SNDRV_CTL_ELEM_TYPE_INTEGER: if (put_user(data->value.integer.min, &data32->value.integer.min) || put_user(data->value.integer.max, &data32->value.integer.max) || put_user(data->value.integer.step, &data32->value.integer.step)) goto error; break; case SNDRV_CTL_ELEM_TYPE_INTEGER64: if (copy_to_user(&data32->value.integer64, &data->value.integer64, sizeof(data->value.integer64))) goto error; break; case SNDRV_CTL_ELEM_TYPE_ENUMERATED: if (copy_to_user(&data32->value.enumerated, &data->value.enumerated, sizeof(data->value.enumerated))) goto error; break; default: break; } err = 0; error: kfree(data); return err; } /* read / write */ struct snd_ctl_elem_value32 { struct snd_ctl_elem_id id; unsigned int indirect; /* bit-field causes misalignment */ union { s32 integer[128]; unsigned char data[512]; #ifndef CONFIG_X86_64 s64 integer64[64]; #endif } value; unsigned char reserved[128]; }; #ifdef CONFIG_X86_X32_ABI /* x32 has a different alignment for 64bit values from ia32 */ struct snd_ctl_elem_value_x32 { struct snd_ctl_elem_id id; unsigned int indirect; /* bit-field causes misalignment */ union { s32 integer[128]; unsigned char data[512]; s64 integer64[64]; } value; unsigned char reserved[128]; }; #endif /* CONFIG_X86_X32_ABI */ /* get the value type and count of the control */ static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, int *countp) { struct snd_kcontrol *kctl; struct snd_ctl_elem_info *info; int err; down_read(&card->controls_rwsem); kctl = snd_ctl_find_id(card, id); if (! kctl) { up_read(&card->controls_rwsem); return -ENOENT; } info = kzalloc(sizeof(*info), GFP_KERNEL); if (info == NULL) { up_read(&card->controls_rwsem); return -ENOMEM; } info->id = *id; err = snd_power_ref_and_wait(card); if (!err) err = kctl->info(kctl, info); snd_power_unref(card); up_read(&card->controls_rwsem); if (err >= 0) { err = info->type; *countp = info->count; } kfree(info); return err; } static int get_elem_size(int type, int count) { switch (type) { case SNDRV_CTL_ELEM_TYPE_INTEGER64: return sizeof(s64) * count; case SNDRV_CTL_ELEM_TYPE_ENUMERATED: return sizeof(int) * count; case SNDRV_CTL_ELEM_TYPE_BYTES: return 512; case SNDRV_CTL_ELEM_TYPE_IEC958: return sizeof(struct snd_aes_iec958); default: return -1; } } static int copy_ctl_value_from_user(struct snd_card *card, struct snd_ctl_elem_value *data, void __user *userdata, void __user *valuep, int *typep, int *countp) { struct snd_ctl_elem_value32 __user *data32 = userdata; int i, type, size; int count; unsigned int indirect; if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) return -EFAULT; if (get_user(indirect, &data32->indirect)) return -EFAULT; if (indirect) return -EINVAL; type = get_ctl_type(card, &data->id, &count); if (type < 0) return type; if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || type == SNDRV_CTL_ELEM_TYPE_INTEGER) { for (i = 0; i < count; i++) { s32 __user *intp = valuep; int val; if (get_user(val, &intp[i])) return -EFAULT; data->value.integer.value[i] = val; } } else { size = get_elem_size(type, count); if (size < 0) { dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type); return -EINVAL; } if (copy_from_user(data->value.bytes.data, valuep, size)) return -EFAULT; } *typep = type; *countp = count; return 0; } /* restore the value to 32bit */ static int copy_ctl_value_to_user(void __user *userdata, void __user *valuep, struct snd_ctl_elem_value *data, int type, int count) { struct snd_ctl_elem_value32 __user *data32 = userdata; int i, size; if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || type == SNDRV_CTL_ELEM_TYPE_INTEGER) { for (i = 0; i < count; i++) { s32 __user *intp = valuep; int val; val = data->value.integer.value[i]; if (put_user(val, &intp[i])) return -EFAULT; } } else { size = get_elem_size(type, count); if (copy_to_user(valuep, data->value.bytes.data, size)) return -EFAULT; } if (copy_to_user(&data32->id, &data->id, sizeof(data32->id))) return -EFAULT; return 0; } static int ctl_elem_read_user(struct snd_card *card, void __user *userdata, void __user *valuep) { struct snd_ctl_elem_value *data; int err, type, count; data = kzalloc(sizeof(*data), GFP_KERNEL); if (data == NULL) return -ENOMEM; err = copy_ctl_value_from_user(card, data, userdata, valuep, &type, &count); if (err < 0) goto error; err = snd_ctl_elem_read(card, data); if (err < 0) goto error; err = copy_ctl_value_to_user(userdata, valuep, data, type, count); error: kfree(data); return err; } static int ctl_elem_write_user(struct snd_ctl_file *file, void __user *userdata, void __user *valuep) { struct snd_ctl_elem_value *data; struct snd_card *card = file->card; int err, type, count; data = kzalloc(sizeof(*data), GFP_KERNEL); if (data == NULL) return -ENOMEM; err = copy_ctl_value_from_user(card, data, userdata, valuep, &type, &count); if (err < 0) goto error; err = snd_ctl_elem_write(card, file, data); if (err < 0) goto error; err = copy_ctl_value_to_user(userdata, valuep, data, type, count); error: kfree(data); return err; } static int snd_ctl_elem_read_user_compat(struct snd_card *card, struct snd_ctl_elem_value32 __user *data32) { return ctl_elem_read_user(card, data32, &data32->value); } static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file, struct snd_ctl_elem_value32 __user *data32) { return ctl_elem_write_user(file, data32, &data32->value); } #ifdef CONFIG_X86_X32_ABI static int snd_ctl_elem_read_user_x32(struct snd_card *card, struct snd_ctl_elem_value_x32 __user *data32) { return ctl_elem_read_user(card, data32, &data32->value); } static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file, struct snd_ctl_elem_value_x32 __user *data32) { return ctl_elem_write_user(file, data32, &data32->value); } #endif /* CONFIG_X86_X32_ABI */ /* add or replace a user control */ static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, struct snd_ctl_elem_info32 __user *data32, int replace) { struct snd_ctl_elem_info *data; int err; data = kzalloc(sizeof(*data), GFP_KERNEL); if (! data) return -ENOMEM; err = -EFAULT; /* id, type, access, count */ \ if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) || copy_from_user(&data->type, &data32->type, 3 * sizeof(u32))) goto error; if (get_user(data->owner, &data32->owner)) goto error; switch (data->type) { case SNDRV_CTL_ELEM_TYPE_BOOLEAN: case SNDRV_CTL_ELEM_TYPE_INTEGER: if (get_user(data->value.integer.min, &data32->value.integer.min) || get_user(data->value.integer.max, &data32->value.integer.max) || get_user(data->value.integer.step, &data32->value.integer.step)) goto error; break; case SNDRV_CTL_ELEM_TYPE_INTEGER64: if (copy_from_user(&data->value.integer64, &data32->value.integer64, sizeof(data->value.integer64))) goto error; break; case SNDRV_CTL_ELEM_TYPE_ENUMERATED: if (copy_from_user(&data->value.enumerated, &data32->value.enumerated, sizeof(data->value.enumerated))) goto error; data->value.enumerated.names_ptr = (uintptr_t)compat_ptr(data->value.enumerated.names_ptr); break; default: break; } err = snd_ctl_elem_add(file, data, replace); error: kfree(data); return err; } enum { SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32), SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32), SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32), SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32), SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32), SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32), #ifdef CONFIG_X86_X32_ABI SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32), SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32), #endif /* CONFIG_X86_X32_ABI */ }; static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) { struct snd_ctl_file *ctl; struct snd_kctl_ioctl *p; void __user *argp = compat_ptr(arg); int err; ctl = file->private_data; if (snd_BUG_ON(!ctl || !ctl->card)) return -ENXIO; switch (cmd) { case SNDRV_CTL_IOCTL_PVERSION: case SNDRV_CTL_IOCTL_CARD_INFO: case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: case SNDRV_CTL_IOCTL_POWER: case SNDRV_CTL_IOCTL_POWER_STATE: case SNDRV_CTL_IOCTL_ELEM_LOCK: case SNDRV_CTL_IOCTL_ELEM_UNLOCK: case SNDRV_CTL_IOCTL_ELEM_REMOVE: case SNDRV_CTL_IOCTL_TLV_READ: case SNDRV_CTL_IOCTL_TLV_WRITE: case SNDRV_CTL_IOCTL_TLV_COMMAND: return snd_ctl_ioctl(file, cmd, (unsigned long)argp); case SNDRV_CTL_IOCTL_ELEM_LIST32: return snd_ctl_elem_list_compat(ctl->card, argp); case SNDRV_CTL_IOCTL_ELEM_INFO32: return snd_ctl_elem_info_compat(ctl, argp); case SNDRV_CTL_IOCTL_ELEM_READ32: return snd_ctl_elem_read_user_compat(ctl->card, argp); case SNDRV_CTL_IOCTL_ELEM_WRITE32: return snd_ctl_elem_write_user_compat(ctl, argp); case SNDRV_CTL_IOCTL_ELEM_ADD32: return snd_ctl_elem_add_compat(ctl, argp, 0); case SNDRV_CTL_IOCTL_ELEM_REPLACE32: return snd_ctl_elem_add_compat(ctl, argp, 1); #ifdef CONFIG_X86_X32_ABI case SNDRV_CTL_IOCTL_ELEM_READ_X32: return snd_ctl_elem_read_user_x32(ctl->card, argp); case SNDRV_CTL_IOCTL_ELEM_WRITE_X32: return snd_ctl_elem_write_user_x32(ctl, argp); #endif /* CONFIG_X86_X32_ABI */ } down_read(&snd_ioctl_rwsem); list_for_each_entry(p, &snd_control_compat_ioctls, list) { if (p->fioctl) { err = p->fioctl(ctl->card, ctl, cmd, arg); if (err != -ENOIOCTLCMD) { up_read(&snd_ioctl_rwsem); return err; } } } up_read(&snd_ioctl_rwsem); return -ENOIOCTLCMD; } |