1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * compat ioctls for control API
5 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
8 /* this file included from control.c */
10 #include <linux/compat.h>
11 #include <linux/slab.h>
13 struct snd_ctl_elem_list32 {
19 unsigned char reserved[50];
20 } /* don't set packed attribute here */;
22 static int snd_ctl_elem_list_compat(struct snd_card *card,
23 struct snd_ctl_elem_list32 __user *data32)
25 struct snd_ctl_elem_list data = {};
29 /* offset, space, used, count */
30 if (copy_from_user(&data, data32, 4 * sizeof(u32)))
33 if (get_user(ptr, &data32->pids))
35 data.pids = compat_ptr(ptr);
36 err = snd_ctl_elem_list(card, &data);
40 if (copy_to_user(data32, &data, 4 * sizeof(u32)))
46 * control element info
47 * it uses union, so the things are not easy..
50 struct snd_ctl_elem_info32 {
51 struct snd_ctl_elem_id id; // the size of struct is same
74 unsigned char reserved[128];
76 unsigned char reserved[64];
77 } __attribute__((packed));
79 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
80 struct snd_ctl_elem_info32 __user *data32)
82 struct snd_ctl_elem_info *data;
85 data = kzalloc(sizeof(*data), GFP_KERNEL);
91 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
93 /* we need to copy the item index.
94 * hope this doesn't break anything..
96 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
99 err = snd_ctl_elem_info(ctl, data);
102 /* restore info to 32bit */
104 /* id, type, access, count */
105 if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
106 copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
108 if (put_user(data->owner, &data32->owner))
110 switch (data->type) {
111 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
112 case SNDRV_CTL_ELEM_TYPE_INTEGER:
113 if (put_user(data->value.integer.min, &data32->value.integer.min) ||
114 put_user(data->value.integer.max, &data32->value.integer.max) ||
115 put_user(data->value.integer.step, &data32->value.integer.step))
118 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
119 if (copy_to_user(&data32->value.integer64,
120 &data->value.integer64,
121 sizeof(data->value.integer64)))
124 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
125 if (copy_to_user(&data32->value.enumerated,
126 &data->value.enumerated,
127 sizeof(data->value.enumerated)))
140 struct snd_ctl_elem_value32 {
141 struct snd_ctl_elem_id id;
142 unsigned int indirect; /* bit-field causes misalignment */
145 unsigned char data[512];
146 #ifndef CONFIG_X86_64
150 unsigned char reserved[128];
153 #ifdef CONFIG_X86_X32
154 /* x32 has a different alignment for 64bit values from ia32 */
155 struct snd_ctl_elem_value_x32 {
156 struct snd_ctl_elem_id id;
157 unsigned int indirect; /* bit-field causes misalignment */
160 unsigned char data[512];
163 unsigned char reserved[128];
165 #endif /* CONFIG_X86_X32 */
167 /* get the value type and count of the control */
168 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
171 struct snd_kcontrol *kctl;
172 struct snd_ctl_elem_info *info;
175 down_read(&card->controls_rwsem);
176 kctl = snd_ctl_find_id(card, id);
178 up_read(&card->controls_rwsem);
181 info = kzalloc(sizeof(*info), GFP_KERNEL);
183 up_read(&card->controls_rwsem);
187 err = snd_power_ref_and_wait(card);
189 err = kctl->info(kctl, info);
190 snd_power_unref(card);
191 up_read(&card->controls_rwsem);
194 *countp = info->count;
200 static int get_elem_size(int type, int count)
203 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
204 return sizeof(s64) * count;
205 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
206 return sizeof(int) * count;
207 case SNDRV_CTL_ELEM_TYPE_BYTES:
209 case SNDRV_CTL_ELEM_TYPE_IEC958:
210 return sizeof(struct snd_aes_iec958);
216 static int copy_ctl_value_from_user(struct snd_card *card,
217 struct snd_ctl_elem_value *data,
218 void __user *userdata,
220 int *typep, int *countp)
222 struct snd_ctl_elem_value32 __user *data32 = userdata;
225 unsigned int indirect;
227 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
229 if (get_user(indirect, &data32->indirect))
233 type = get_ctl_type(card, &data->id, &count);
237 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
238 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
239 for (i = 0; i < count; i++) {
240 s32 __user *intp = valuep;
242 if (get_user(val, &intp[i]))
244 data->value.integer.value[i] = val;
247 size = get_elem_size(type, count);
249 dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
252 if (copy_from_user(data->value.bytes.data, valuep, size))
261 /* restore the value to 32bit */
262 static int copy_ctl_value_to_user(void __user *userdata,
264 struct snd_ctl_elem_value *data,
269 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
270 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
271 for (i = 0; i < count; i++) {
272 s32 __user *intp = valuep;
274 val = data->value.integer.value[i];
275 if (put_user(val, &intp[i]))
279 size = get_elem_size(type, count);
280 if (copy_to_user(valuep, data->value.bytes.data, size))
286 static int ctl_elem_read_user(struct snd_card *card,
287 void __user *userdata, void __user *valuep)
289 struct snd_ctl_elem_value *data;
290 int err, type, count;
292 data = kzalloc(sizeof(*data), GFP_KERNEL);
296 err = copy_ctl_value_from_user(card, data, userdata, valuep,
301 err = snd_ctl_elem_read(card, data);
304 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
310 static int ctl_elem_write_user(struct snd_ctl_file *file,
311 void __user *userdata, void __user *valuep)
313 struct snd_ctl_elem_value *data;
314 struct snd_card *card = file->card;
315 int err, type, count;
317 data = kzalloc(sizeof(*data), GFP_KERNEL);
321 err = copy_ctl_value_from_user(card, data, userdata, valuep,
326 err = snd_ctl_elem_write(card, file, data);
329 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
335 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
336 struct snd_ctl_elem_value32 __user *data32)
338 return ctl_elem_read_user(card, data32, &data32->value);
341 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
342 struct snd_ctl_elem_value32 __user *data32)
344 return ctl_elem_write_user(file, data32, &data32->value);
347 #ifdef CONFIG_X86_X32
348 static int snd_ctl_elem_read_user_x32(struct snd_card *card,
349 struct snd_ctl_elem_value_x32 __user *data32)
351 return ctl_elem_read_user(card, data32, &data32->value);
354 static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
355 struct snd_ctl_elem_value_x32 __user *data32)
357 return ctl_elem_write_user(file, data32, &data32->value);
359 #endif /* CONFIG_X86_X32 */
361 /* add or replace a user control */
362 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
363 struct snd_ctl_elem_info32 __user *data32,
366 struct snd_ctl_elem_info *data;
369 data = kzalloc(sizeof(*data), GFP_KERNEL);
374 /* id, type, access, count */ \
375 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
376 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
378 if (get_user(data->owner, &data32->owner))
380 switch (data->type) {
381 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
382 case SNDRV_CTL_ELEM_TYPE_INTEGER:
383 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
384 get_user(data->value.integer.max, &data32->value.integer.max) ||
385 get_user(data->value.integer.step, &data32->value.integer.step))
388 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
389 if (copy_from_user(&data->value.integer64,
390 &data32->value.integer64,
391 sizeof(data->value.integer64)))
394 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
395 if (copy_from_user(&data->value.enumerated,
396 &data32->value.enumerated,
397 sizeof(data->value.enumerated)))
399 data->value.enumerated.names_ptr =
400 (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
405 err = snd_ctl_elem_add(file, data, replace);
412 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
413 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
414 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
415 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
416 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
417 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
418 #ifdef CONFIG_X86_X32
419 SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
420 SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
421 #endif /* CONFIG_X86_X32 */
424 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
426 struct snd_ctl_file *ctl;
427 struct snd_kctl_ioctl *p;
428 void __user *argp = compat_ptr(arg);
431 ctl = file->private_data;
432 if (snd_BUG_ON(!ctl || !ctl->card))
436 case SNDRV_CTL_IOCTL_PVERSION:
437 case SNDRV_CTL_IOCTL_CARD_INFO:
438 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
439 case SNDRV_CTL_IOCTL_POWER:
440 case SNDRV_CTL_IOCTL_POWER_STATE:
441 case SNDRV_CTL_IOCTL_ELEM_LOCK:
442 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
443 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
444 case SNDRV_CTL_IOCTL_TLV_READ:
445 case SNDRV_CTL_IOCTL_TLV_WRITE:
446 case SNDRV_CTL_IOCTL_TLV_COMMAND:
447 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
448 case SNDRV_CTL_IOCTL_ELEM_LIST32:
449 return snd_ctl_elem_list_compat(ctl->card, argp);
450 case SNDRV_CTL_IOCTL_ELEM_INFO32:
451 return snd_ctl_elem_info_compat(ctl, argp);
452 case SNDRV_CTL_IOCTL_ELEM_READ32:
453 return snd_ctl_elem_read_user_compat(ctl->card, argp);
454 case SNDRV_CTL_IOCTL_ELEM_WRITE32:
455 return snd_ctl_elem_write_user_compat(ctl, argp);
456 case SNDRV_CTL_IOCTL_ELEM_ADD32:
457 return snd_ctl_elem_add_compat(ctl, argp, 0);
458 case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
459 return snd_ctl_elem_add_compat(ctl, argp, 1);
460 #ifdef CONFIG_X86_X32
461 case SNDRV_CTL_IOCTL_ELEM_READ_X32:
462 return snd_ctl_elem_read_user_x32(ctl->card, argp);
463 case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
464 return snd_ctl_elem_write_user_x32(ctl, argp);
465 #endif /* CONFIG_X86_X32 */
468 down_read(&snd_ioctl_rwsem);
469 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
471 err = p->fioctl(ctl->card, ctl, cmd, arg);
472 if (err != -ENOIOCTLCMD) {
473 up_read(&snd_ioctl_rwsem);
478 up_read(&snd_ioctl_rwsem);