projects/linux·blob master · refs

489 lines · 12.5 KiB

1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * compat ioctls for control API
4 *
5 * Copyright (c) by Takashi Iwai <[email protected]>
6 */
7
8/* this file included from control.c */
9
10#include <linux/compat.h>
11#include <linux/slab.h>
12
13struct snd_ctl_elem_list32 {
14 u32 offset;
15 u32 space;
16 u32 used;
17 u32 count;
18 u32 pids;
19 unsigned char reserved[50];
20} /* don't set packed attribute here */;
21
22static int snd_ctl_elem_list_compat(struct snd_card *card,
23 struct snd_ctl_elem_list32 __user *data32)
24{
25 struct snd_ctl_elem_list data = {};
26 compat_caddr_t ptr;
27 int err;
28
29 /* offset, space, used, count */
30 if (copy_from_user(&data, data32, 4 * sizeof(u32)))
31 return -EFAULT;
32 /* pids */
33 if (get_user(ptr, &data32->pids))
34 return -EFAULT;
35 data.pids = compat_ptr(ptr);
36 err = snd_ctl_elem_list(card, &data);
37 if (err < 0)
38 return err;
39 /* copy the result */
40 if (copy_to_user(data32, &data, 4 * sizeof(u32)))
41 return -EFAULT;
42 return 0;
43}
44
45/*
46 * control element info
47 * it uses union, so the things are not easy..
48 */
49
50struct snd_ctl_elem_info32 {
51 struct snd_ctl_elem_id id; // the size of struct is same
52 s32 type;
53 u32 access;
54 u32 count;
55 s32 owner;
56 union {
57 struct {
58 s32 min;
59 s32 max;
60 s32 step;
61 } integer;
62 struct {
63 u64 min;
64 u64 max;
65 u64 step;
66 } integer64;
67 struct {
68 u32 items;
69 u32 item;
70 char name[64];
71 u64 names_ptr;
72 u32 names_length;
73 } enumerated;
74 unsigned char reserved[128];
75 } value;
76 unsigned char reserved[64];
77} __packed;
78
79static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
80 struct snd_ctl_elem_info32 __user *data32)
81{
82 struct snd_card *card = ctl->card;
83 int err;
84 struct snd_ctl_elem_info *data __free(kfree) =
85 kzalloc_obj(*data);
86
87 if (! data)
88 return -ENOMEM;
89
90 /* copy id */
91 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
92 return -EFAULT;
93 /* we need to copy the item index.
94 * hope this doesn't break anything..
95 */
96 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
97 return -EFAULT;
98
99 err = snd_power_ref_and_wait(card);
100 if (err < 0)
101 return err;
102 err = snd_ctl_elem_info(ctl, data);
103 snd_power_unref(card);
104 if (err < 0)
105 return err;
106 /* restore info to 32bit */
107 /* id, type, access, count */
108 if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
109 copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
110 return -EFAULT;
111 if (put_user(data->owner, &data32->owner))
112 return -EFAULT;
113 switch (data->type) {
114 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
115 case SNDRV_CTL_ELEM_TYPE_INTEGER:
116 if (put_user(data->value.integer.min, &data32->value.integer.min) ||
117 put_user(data->value.integer.max, &data32->value.integer.max) ||
118 put_user(data->value.integer.step, &data32->value.integer.step))
119 return -EFAULT;
120 break;
121 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
122 if (copy_to_user(&data32->value.integer64,
123 &data->value.integer64,
124 sizeof(data->value.integer64)))
125 return -EFAULT;
126 break;
127 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
128 if (copy_to_user(&data32->value.enumerated,
129 &data->value.enumerated,
130 sizeof(data->value.enumerated)))
131 return -EFAULT;
132 break;
133 default:
134 break;
135 }
136 return 0;
137}
138
139/* read / write */
140struct snd_ctl_elem_value32 {
141 struct snd_ctl_elem_id id;
142 unsigned int indirect; /* bit-field causes misalignment */
143 union {
144 s32 integer[128];
145 unsigned char data[512];
146#ifndef CONFIG_X86_64
147 s64 integer64[64];
148#endif
149 } value;
150 unsigned char reserved[128];
151};
152
153#ifdef CONFIG_X86_X32_ABI
154/* x32 has a different alignment for 64bit values from ia32 */
155struct snd_ctl_elem_value_x32 {
156 struct snd_ctl_elem_id id;
157 unsigned int indirect; /* bit-field causes misalignment */
158 union {
159 s32 integer[128];
160 unsigned char data[512];
161 s64 integer64[64];
162 } value;
163 unsigned char reserved[128];
164};
165#endif /* CONFIG_X86_X32_ABI */
166
167/* get the value type and count of the control */
168static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
169 int *countp)
170{
171 struct snd_kcontrol *kctl;
172 int err;
173
174 guard(rwsem_read)(&card->controls_rwsem);
175 kctl = snd_ctl_find_id(card, id);
176 if (!kctl)
177 return -ENOENT;
178
179 struct snd_ctl_elem_info *info __free(kfree) =
180 kzalloc_obj(*info);
181 if (info == NULL)
182 return -ENOMEM;
183 info->id = *id;
184 err = kctl->info(kctl, info);
185 if (err >= 0) {
186 err = info->type;
187 *countp = info->count;
188 }
189 return err;
190}
191
192static int get_elem_size(snd_ctl_elem_type_t type, int count)
193{
194 switch (type) {
195 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
196 return sizeof(s64) * count;
197 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
198 return sizeof(int) * count;
199 case SNDRV_CTL_ELEM_TYPE_BYTES:
200 return 512;
201 case SNDRV_CTL_ELEM_TYPE_IEC958:
202 return sizeof(struct snd_aes_iec958);
203 default:
204 return -1;
205 }
206}
207
208static int copy_ctl_value_from_user(struct snd_card *card,
209 struct snd_ctl_elem_value *data,
210 void __user *userdata,
211 void __user *valuep,
212 int *typep, int *countp)
213{
214 struct snd_ctl_elem_value32 __user *data32 = userdata;
215 int i, type, size;
216 int count;
217 unsigned int indirect;
218
219 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
220 return -EFAULT;
221 if (get_user(indirect, &data32->indirect))
222 return -EFAULT;
223 if (indirect)
224 return -EINVAL;
225 type = get_ctl_type(card, &data->id, &count);
226 if (type < 0)
227 return type;
228
229 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
230 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
231 for (i = 0; i < count; i++) {
232 s32 __user *intp = valuep;
233 int val;
234 if (get_user(val, &intp[i]))
235 return -EFAULT;
236 data->value.integer.value[i] = val;
237 }
238 } else {
239 size = get_elem_size(type, count);
240 if (size < 0) {
241 dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
242 return -EINVAL;
243 }
244 if (copy_from_user(data->value.bytes.data, valuep, size))
245 return -EFAULT;
246 }
247
248 *typep = type;
249 *countp = count;
250 return 0;
251}
252
253/* restore the value to 32bit */
254static int copy_ctl_value_to_user(void __user *userdata,
255 void __user *valuep,
256 struct snd_ctl_elem_value *data,
257 int type, int count)
258{
259 struct snd_ctl_elem_value32 __user *data32 = userdata;
260 int i, size;
261
262 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
263 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
264 for (i = 0; i < count; i++) {
265 s32 __user *intp = valuep;
266 int val;
267 val = data->value.integer.value[i];
268 if (put_user(val, &intp[i]))
269 return -EFAULT;
270 }
271 } else {
272 size = get_elem_size(type, count);
273 if (copy_to_user(valuep, data->value.bytes.data, size))
274 return -EFAULT;
275 }
276 if (copy_to_user(&data32->id, &data->id, sizeof(data32->id)))
277 return -EFAULT;
278 return 0;
279}
280
281static int __ctl_elem_read_user(struct snd_card *card,
282 void __user *userdata, void __user *valuep)
283{
284 int err, type, count;
285 struct snd_ctl_elem_value *data __free(kfree) =
286 kzalloc_obj(*data);
287
288 if (data == NULL)
289 return -ENOMEM;
290
291 err = copy_ctl_value_from_user(card, data, userdata, valuep,
292 &type, &count);
293 if (err < 0)
294 return err;
295
296 err = snd_ctl_elem_read(card, data);
297 if (err < 0)
298 return err;
299 return copy_ctl_value_to_user(userdata, valuep, data, type, count);
300}
301
302static int ctl_elem_read_user(struct snd_card *card,
303 void __user *userdata, void __user *valuep)
304{
305 int err;
306
307 err = snd_power_ref_and_wait(card);
308 if (err < 0)
309 return err;
310 err = __ctl_elem_read_user(card, userdata, valuep);
311 snd_power_unref(card);
312 return err;
313}
314
315static int __ctl_elem_write_user(struct snd_ctl_file *file,
316 void __user *userdata, void __user *valuep)
317{
318 struct snd_card *card = file->card;
319 int err, type, count;
320 struct snd_ctl_elem_value *data __free(kfree) =
321 kzalloc_obj(*data);
322
323 if (data == NULL)
324 return -ENOMEM;
325
326 err = copy_ctl_value_from_user(card, data, userdata, valuep,
327 &type, &count);
328 if (err < 0)
329 return err;
330
331 err = snd_ctl_elem_write(card, file, data);
332 if (err < 0)
333 return err;
334 return copy_ctl_value_to_user(userdata, valuep, data, type, count);
335}
336
337static int ctl_elem_write_user(struct snd_ctl_file *file,
338 void __user *userdata, void __user *valuep)
339{
340 struct snd_card *card = file->card;
341 int err;
342
343 err = snd_power_ref_and_wait(card);
344 if (err < 0)
345 return err;
346 err = __ctl_elem_write_user(file, userdata, valuep);
347 snd_power_unref(card);
348 return err;
349}
350
351static int snd_ctl_elem_read_user_compat(struct snd_card *card,
352 struct snd_ctl_elem_value32 __user *data32)
353{
354 return ctl_elem_read_user(card, data32, &data32->value);
355}
356
357static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
358 struct snd_ctl_elem_value32 __user *data32)
359{
360 return ctl_elem_write_user(file, data32, &data32->value);
361}
362
363#ifdef CONFIG_X86_X32_ABI
364static int snd_ctl_elem_read_user_x32(struct snd_card *card,
365 struct snd_ctl_elem_value_x32 __user *data32)
366{
367 return ctl_elem_read_user(card, data32, &data32->value);
368}
369
370static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
371 struct snd_ctl_elem_value_x32 __user *data32)
372{
373 return ctl_elem_write_user(file, data32, &data32->value);
374}
375#endif /* CONFIG_X86_X32_ABI */
376
377/* add or replace a user control */
378static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
379 struct snd_ctl_elem_info32 __user *data32,
380 int replace)
381{
382 struct snd_ctl_elem_info *data __free(kfree) =
383 kzalloc_obj(*data);
384
385 if (! data)
386 return -ENOMEM;
387
388 /* id, type, access, count */ \
389 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
390 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
391 return -EFAULT;
392 if (get_user(data->owner, &data32->owner))
393 return -EFAULT;
394 switch (data->type) {
395 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
396 case SNDRV_CTL_ELEM_TYPE_INTEGER:
397 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
398 get_user(data->value.integer.max, &data32->value.integer.max) ||
399 get_user(data->value.integer.step, &data32->value.integer.step))
400 return -EFAULT;
401 break;
402 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
403 if (copy_from_user(&data->value.integer64,
404 &data32->value.integer64,
405 sizeof(data->value.integer64)))
406 return -EFAULT;
407 break;
408 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
409 if (copy_from_user(&data->value.enumerated,
410 &data32->value.enumerated,
411 sizeof(data->value.enumerated)))
412 return -EFAULT;
413 data->value.enumerated.names_ptr =
414 (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
415 break;
416 default:
417 break;
418 }
419 return snd_ctl_elem_add(file, data, replace);
420}
421
422enum {
423 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
424 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
425 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
426 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
427 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
428 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
429#ifdef CONFIG_X86_X32_ABI
430 SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
431 SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
432#endif /* CONFIG_X86_X32_ABI */
433};
434
435static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
436{
437 struct snd_ctl_file *ctl;
438 struct snd_kctl_ioctl *p;
439 void __user *argp = compat_ptr(arg);
440 int err;
441
442 ctl = file->private_data;
443 if (snd_BUG_ON(!ctl || !ctl->card))
444 return -ENXIO;
445
446 switch (cmd) {
447 case SNDRV_CTL_IOCTL_PVERSION:
448 case SNDRV_CTL_IOCTL_CARD_INFO:
449 case SNDRV_CTL_IOCTL_CARD_BYTES:
450 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
451 case SNDRV_CTL_IOCTL_POWER:
452 case SNDRV_CTL_IOCTL_POWER_STATE:
453 case SNDRV_CTL_IOCTL_ELEM_LOCK:
454 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
455 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
456 case SNDRV_CTL_IOCTL_TLV_READ:
457 case SNDRV_CTL_IOCTL_TLV_WRITE:
458 case SNDRV_CTL_IOCTL_TLV_COMMAND:
459 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
460 case SNDRV_CTL_IOCTL_ELEM_LIST32:
461 return snd_ctl_elem_list_compat(ctl->card, argp);
462 case SNDRV_CTL_IOCTL_ELEM_INFO32:
463 return snd_ctl_elem_info_compat(ctl, argp);
464 case SNDRV_CTL_IOCTL_ELEM_READ32:
465 return snd_ctl_elem_read_user_compat(ctl->card, argp);
466 case SNDRV_CTL_IOCTL_ELEM_WRITE32:
467 return snd_ctl_elem_write_user_compat(ctl, argp);
468 case SNDRV_CTL_IOCTL_ELEM_ADD32:
469 return snd_ctl_elem_add_compat(ctl, argp, 0);
470 case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
471 return snd_ctl_elem_add_compat(ctl, argp, 1);
472#ifdef CONFIG_X86_X32_ABI
473 case SNDRV_CTL_IOCTL_ELEM_READ_X32:
474 return snd_ctl_elem_read_user_x32(ctl->card, argp);
475 case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
476 return snd_ctl_elem_write_user_x32(ctl, argp);
477#endif /* CONFIG_X86_X32_ABI */
478 }
479
480 guard(rwsem_read)(&snd_ioctl_rwsem);
481 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
482 if (p->fioctl) {
483 err = p->fioctl(ctl->card, ctl, cmd, arg);
484 if (err != -ENOIOCTLCMD)
485 return err;
486 }
487 }
488 return -ENOIOCTLCMD;
489}