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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} ;
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
30 if (copy_from_user(&data, data32, 4 * sizeof(u32)))
31 return -EFAULT;
32
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
40 if (copy_to_user(data32, &data, 4 * sizeof(u32)))
41 return -EFAULT;
42 return 0;
43}
44
45
46
47
48
49
50struct snd_ctl_elem_info32 {
51 struct snd_ctl_elem_id id;
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} __attribute__((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_ctl_elem_info *data;
83 int err;
84
85 data = kzalloc(sizeof(*data), GFP_KERNEL);
86 if (! data)
87 return -ENOMEM;
88
89 err = -EFAULT;
90
91 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
92 goto error;
93
94
95
96 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
97 goto error;
98
99 err = snd_ctl_elem_info(ctl, data);
100 if (err < 0)
101 goto error;
102
103 err = -EFAULT;
104
105 if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
106 copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
107 goto error;
108 if (put_user(data->owner, &data32->owner))
109 goto error;
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))
116 goto error;
117 break;
118 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
119 if (copy_to_user(&data32->value.integer64,
120 &data->value.integer64,
121 sizeof(data->value.integer64)))
122 goto error;
123 break;
124 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
125 if (copy_to_user(&data32->value.enumerated,
126 &data->value.enumerated,
127 sizeof(data->value.enumerated)))
128 goto error;
129 break;
130 default:
131 break;
132 }
133 err = 0;
134 error:
135 kfree(data);
136 return err;
137}
138
139
140struct snd_ctl_elem_value32 {
141 struct snd_ctl_elem_id id;
142 unsigned int indirect;
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
154
155struct snd_ctl_elem_value_x32 {
156 struct snd_ctl_elem_id id;
157 unsigned int indirect;
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
166
167
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 struct snd_ctl_elem_info *info;
173 int err;
174
175 down_read(&card->controls_rwsem);
176 kctl = snd_ctl_find_id(card, id);
177 if (! kctl) {
178 up_read(&card->controls_rwsem);
179 return -ENOENT;
180 }
181 info = kzalloc(sizeof(*info), GFP_KERNEL);
182 if (info == NULL) {
183 up_read(&card->controls_rwsem);
184 return -ENOMEM;
185 }
186 info->id = *id;
187 err = snd_power_ref_and_wait(card);
188 if (!err)
189 err = kctl->info(kctl, info);
190 snd_power_unref(card);
191 up_read(&card->controls_rwsem);
192 if (err >= 0) {
193 err = info->type;
194 *countp = info->count;
195 }
196 kfree(info);
197 return err;
198}
199
200static int get_elem_size(int type, int count)
201{
202 switch (type) {
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:
208 return 512;
209 case SNDRV_CTL_ELEM_TYPE_IEC958:
210 return sizeof(struct snd_aes_iec958);
211 default:
212 return -1;
213 }
214}
215
216static int copy_ctl_value_from_user(struct snd_card *card,
217 struct snd_ctl_elem_value *data,
218 void __user *userdata,
219 void __user *valuep,
220 int *typep, int *countp)
221{
222 struct snd_ctl_elem_value32 __user *data32 = userdata;
223 int i, type, size;
224 int count;
225 unsigned int indirect;
226
227 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
228 return -EFAULT;
229 if (get_user(indirect, &data32->indirect))
230 return -EFAULT;
231 if (indirect)
232 return -EINVAL;
233 type = get_ctl_type(card, &data->id, &count);
234 if (type < 0)
235 return type;
236
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;
241 int val;
242 if (get_user(val, &intp[i]))
243 return -EFAULT;
244 data->value.integer.value[i] = val;
245 }
246 } else {
247 size = get_elem_size(type, count);
248 if (size < 0) {
249 dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
250 return -EINVAL;
251 }
252 if (copy_from_user(data->value.bytes.data, valuep, size))
253 return -EFAULT;
254 }
255
256 *typep = type;
257 *countp = count;
258 return 0;
259}
260
261
262static int copy_ctl_value_to_user(void __user *userdata,
263 void __user *valuep,
264 struct snd_ctl_elem_value *data,
265 int type, int count)
266{
267 int i, size;
268
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;
273 int val;
274 val = data->value.integer.value[i];
275 if (put_user(val, &intp[i]))
276 return -EFAULT;
277 }
278 } else {
279 size = get_elem_size(type, count);
280 if (copy_to_user(valuep, data->value.bytes.data, size))
281 return -EFAULT;
282 }
283 return 0;
284}
285
286static int ctl_elem_read_user(struct snd_card *card,
287 void __user *userdata, void __user *valuep)
288{
289 struct snd_ctl_elem_value *data;
290 int err, type, count;
291
292 data = kzalloc(sizeof(*data), GFP_KERNEL);
293 if (data == NULL)
294 return -ENOMEM;
295
296 err = copy_ctl_value_from_user(card, data, userdata, valuep,
297 &type, &count);
298 if (err < 0)
299 goto error;
300
301 err = snd_ctl_elem_read(card, data);
302 if (err < 0)
303 goto error;
304 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
305 error:
306 kfree(data);
307 return err;
308}
309
310static int ctl_elem_write_user(struct snd_ctl_file *file,
311 void __user *userdata, void __user *valuep)
312{
313 struct snd_ctl_elem_value *data;
314 struct snd_card *card = file->card;
315 int err, type, count;
316
317 data = kzalloc(sizeof(*data), GFP_KERNEL);
318 if (data == NULL)
319 return -ENOMEM;
320
321 err = copy_ctl_value_from_user(card, data, userdata, valuep,
322 &type, &count);
323 if (err < 0)
324 goto error;
325
326 err = snd_ctl_elem_write(card, file, data);
327 if (err < 0)
328 goto error;
329 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
330 error:
331 kfree(data);
332 return err;
333}
334
335static int snd_ctl_elem_read_user_compat(struct snd_card *card,
336 struct snd_ctl_elem_value32 __user *data32)
337{
338 return ctl_elem_read_user(card, data32, &data32->value);
339}
340
341static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
342 struct snd_ctl_elem_value32 __user *data32)
343{
344 return ctl_elem_write_user(file, data32, &data32->value);
345}
346
347#ifdef CONFIG_X86_X32
348static int snd_ctl_elem_read_user_x32(struct snd_card *card,
349 struct snd_ctl_elem_value_x32 __user *data32)
350{
351 return ctl_elem_read_user(card, data32, &data32->value);
352}
353
354static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
355 struct snd_ctl_elem_value_x32 __user *data32)
356{
357 return ctl_elem_write_user(file, data32, &data32->value);
358}
359#endif
360
361
362static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
363 struct snd_ctl_elem_info32 __user *data32,
364 int replace)
365{
366 struct snd_ctl_elem_info *data;
367 int err;
368
369 data = kzalloc(sizeof(*data), GFP_KERNEL);
370 if (! data)
371 return -ENOMEM;
372
373 err = -EFAULT;
374 \
375 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
376 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
377 goto error;
378 if (get_user(data->owner, &data32->owner))
379 goto error;
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))
386 goto error;
387 break;
388 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
389 if (copy_from_user(&data->value.integer64,
390 &data32->value.integer64,
391 sizeof(data->value.integer64)))
392 goto error;
393 break;
394 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
395 if (copy_from_user(&data->value.enumerated,
396 &data32->value.enumerated,
397 sizeof(data->value.enumerated)))
398 goto error;
399 data->value.enumerated.names_ptr =
400 (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
401 break;
402 default:
403 break;
404 }
405 err = snd_ctl_elem_add(file, data, replace);
406 error:
407 kfree(data);
408 return err;
409}
410
411enum {
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
422};
423
424static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
425{
426 struct snd_ctl_file *ctl;
427 struct snd_kctl_ioctl *p;
428 void __user *argp = compat_ptr(arg);
429 int err;
430
431 ctl = file->private_data;
432 if (snd_BUG_ON(!ctl || !ctl->card))
433 return -ENXIO;
434
435 switch (cmd) {
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
466 }
467
468 down_read(&snd_ioctl_rwsem);
469 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
470 if (p->fioctl) {
471 err = p->fioctl(ctl->card, ctl, cmd, arg);
472 if (err != -ENOIOCTLCMD) {
473 up_read(&snd_ioctl_rwsem);
474 return err;
475 }
476 }
477 }
478 up_read(&snd_ioctl_rwsem);
479 return -ENOIOCTLCMD;
480}
481
