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TOMOYO Linux Cross Reference
Linux/sound/core/control_compat.c

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  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 #include <linux/slab.h>
 25 
 26 struct snd_ctl_elem_list32 {
 27         u32 offset;
 28         u32 space;
 29         u32 used;
 30         u32 count;
 31         u32 pids;
 32         unsigned char reserved[50];
 33 } /* don't set packed attribute here */;
 34 
 35 static int snd_ctl_elem_list_compat(struct snd_card *card,
 36                                     struct snd_ctl_elem_list32 __user *data32)
 37 {
 38         struct snd_ctl_elem_list __user *data;
 39         compat_caddr_t ptr;
 40         int err;
 41 
 42         data = compat_alloc_user_space(sizeof(*data));
 43 
 44         /* offset, space, used, count */
 45         if (copy_in_user(data, data32, 4 * sizeof(u32)))
 46                 return -EFAULT;
 47         /* pids */
 48         if (get_user(ptr, &data32->pids) ||
 49             put_user(compat_ptr(ptr), &data->pids))
 50                 return -EFAULT;
 51         err = snd_ctl_elem_list(card, data);
 52         if (err < 0)
 53                 return err;
 54         /* copy the result */
 55         if (copy_in_user(data32, data, 4 * sizeof(u32)))
 56                 return -EFAULT;
 57         return 0;
 58 }
 59 
 60 /*
 61  * control element info
 62  * it uses union, so the things are not easy..
 63  */
 64 
 65 struct snd_ctl_elem_info32 {
 66         struct snd_ctl_elem_id id; // the size of struct is same
 67         s32 type;
 68         u32 access;
 69         u32 count;
 70         s32 owner;
 71         union {
 72                 struct {
 73                         s32 min;
 74                         s32 max;
 75                         s32 step;
 76                 } integer;
 77                 struct {
 78                         u64 min;
 79                         u64 max;
 80                         u64 step;
 81                 } integer64;
 82                 struct {
 83                         u32 items;
 84                         u32 item;
 85                         char name[64];
 86                         u64 names_ptr;
 87                         u32 names_length;
 88                 } enumerated;
 89                 unsigned char reserved[128];
 90         } value;
 91         unsigned char reserved[64];
 92 } __attribute__((packed));
 93 
 94 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
 95                                     struct snd_ctl_elem_info32 __user *data32)
 96 {
 97         struct snd_ctl_elem_info *data;
 98         int err;
 99 
100         data = kzalloc(sizeof(*data), GFP_KERNEL);
101         if (! data)
102                 return -ENOMEM;
103 
104         err = -EFAULT;
105         /* copy id */
106         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
107                 goto error;
108         /* we need to copy the item index.
109          * hope this doesn't break anything..
110          */
111         if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
112                 goto error;
113 
114         snd_power_lock(ctl->card);
115         err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
116         if (err >= 0)
117                 err = snd_ctl_elem_info(ctl, data);
118         snd_power_unlock(ctl->card);
119 
120         if (err < 0)
121                 goto error;
122         /* restore info to 32bit */
123         err = -EFAULT;
124         /* id, type, access, count */
125         if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
126             copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
127                 goto error;
128         if (put_user(data->owner, &data32->owner))
129                 goto error;
130         switch (data->type) {
131         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
132         case SNDRV_CTL_ELEM_TYPE_INTEGER:
133                 if (put_user(data->value.integer.min, &data32->value.integer.min) ||
134                     put_user(data->value.integer.max, &data32->value.integer.max) ||
135                     put_user(data->value.integer.step, &data32->value.integer.step))
136                         goto error;
137                 break;
138         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
139                 if (copy_to_user(&data32->value.integer64,
140                                  &data->value.integer64,
141                                  sizeof(data->value.integer64)))
142                         goto error;
143                 break;
144         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
145                 if (copy_to_user(&data32->value.enumerated,
146                                  &data->value.enumerated,
147                                  sizeof(data->value.enumerated)))
148                         goto error;
149                 break;
150         default:
151                 break;
152         }
153         err = 0;
154  error:
155         kfree(data);
156         return err;
157 }
158 
159 /* read / write */
160 struct snd_ctl_elem_value32 {
161         struct snd_ctl_elem_id id;
162         unsigned int indirect;  /* bit-field causes misalignment */
163         union {
164                 s32 integer[128];
165                 unsigned char data[512];
166 #ifndef CONFIG_X86_64
167                 s64 integer64[64];
168 #endif
169         } value;
170         unsigned char reserved[128];
171 };
172 
173 #ifdef CONFIG_X86_X32
174 /* x32 has a different alignment for 64bit values from ia32 */
175 struct snd_ctl_elem_value_x32 {
176         struct snd_ctl_elem_id id;
177         unsigned int indirect;  /* bit-field causes misalignment */
178         union {
179                 s32 integer[128];
180                 unsigned char data[512];
181                 s64 integer64[64];
182         } value;
183         unsigned char reserved[128];
184 };
185 #endif /* CONFIG_X86_X32 */
186 
187 /* get the value type and count of the control */
188 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
189                         int *countp)
190 {
191         struct snd_kcontrol *kctl;
192         struct snd_ctl_elem_info *info;
193         int err;
194 
195         down_read(&card->controls_rwsem);
196         kctl = snd_ctl_find_id(card, id);
197         if (! kctl) {
198                 up_read(&card->controls_rwsem);
199                 return -ENXIO;
200         }
201         info = kzalloc(sizeof(*info), GFP_KERNEL);
202         if (info == NULL) {
203                 up_read(&card->controls_rwsem);
204                 return -ENOMEM;
205         }
206         info->id = *id;
207         err = kctl->info(kctl, info);
208         up_read(&card->controls_rwsem);
209         if (err >= 0) {
210                 err = info->type;
211                 *countp = info->count;
212         }
213         kfree(info);
214         return err;
215 }
216 
217 static int get_elem_size(int type, int count)
218 {
219         switch (type) {
220         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
221                 return sizeof(s64) * count;
222         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
223                 return sizeof(int) * count;
224         case SNDRV_CTL_ELEM_TYPE_BYTES:
225                 return 512;
226         case SNDRV_CTL_ELEM_TYPE_IEC958:
227                 return sizeof(struct snd_aes_iec958);
228         default:
229                 return -1;
230         }
231 }
232 
233 static int copy_ctl_value_from_user(struct snd_card *card,
234                                     struct snd_ctl_elem_value *data,
235                                     void __user *userdata,
236                                     void __user *valuep,
237                                     int *typep, int *countp)
238 {
239         struct snd_ctl_elem_value32 __user *data32 = userdata;
240         int i, type, size;
241         int uninitialized_var(count);
242         unsigned int indirect;
243 
244         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
245                 return -EFAULT;
246         if (get_user(indirect, &data32->indirect))
247                 return -EFAULT;
248         if (indirect)
249                 return -EINVAL;
250         type = get_ctl_type(card, &data->id, &count);
251         if (type < 0)
252                 return type;
253 
254         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
255             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
256                 for (i = 0; i < count; i++) {
257                         s32 __user *intp = valuep;
258                         int val;
259                         if (get_user(val, &intp[i]))
260                                 return -EFAULT;
261                         data->value.integer.value[i] = val;
262                 }
263         } else {
264                 size = get_elem_size(type, count);
265                 if (size < 0) {
266                         printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
267                         return -EINVAL;
268                 }
269                 if (copy_from_user(data->value.bytes.data, valuep, size))
270                         return -EFAULT;
271         }
272 
273         *typep = type;
274         *countp = count;
275         return 0;
276 }
277 
278 /* restore the value to 32bit */
279 static int copy_ctl_value_to_user(void __user *userdata,
280                                   void __user *valuep,
281                                   struct snd_ctl_elem_value *data,
282                                   int type, int count)
283 {
284         int i, size;
285 
286         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
287             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
288                 for (i = 0; i < count; i++) {
289                         s32 __user *intp = valuep;
290                         int val;
291                         val = data->value.integer.value[i];
292                         if (put_user(val, &intp[i]))
293                                 return -EFAULT;
294                 }
295         } else {
296                 size = get_elem_size(type, count);
297                 if (copy_to_user(valuep, data->value.bytes.data, size))
298                         return -EFAULT;
299         }
300         return 0;
301 }
302 
303 static int ctl_elem_read_user(struct snd_card *card,
304                               void __user *userdata, void __user *valuep)
305 {
306         struct snd_ctl_elem_value *data;
307         int err, type, count;
308 
309         data = kzalloc(sizeof(*data), GFP_KERNEL);
310         if (data == NULL)
311                 return -ENOMEM;
312 
313         err = copy_ctl_value_from_user(card, data, userdata, valuep,
314                                        &type, &count);
315         if (err < 0)
316                 goto error;
317 
318         snd_power_lock(card);
319         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
320         if (err >= 0)
321                 err = snd_ctl_elem_read(card, data);
322         snd_power_unlock(card);
323         if (err >= 0)
324                 err = copy_ctl_value_to_user(userdata, valuep, data,
325                                              type, count);
326  error:
327         kfree(data);
328         return err;
329 }
330 
331 static int ctl_elem_write_user(struct snd_ctl_file *file,
332                                void __user *userdata, void __user *valuep)
333 {
334         struct snd_ctl_elem_value *data;
335         struct snd_card *card = file->card;
336         int err, type, count;
337 
338         data = kzalloc(sizeof(*data), GFP_KERNEL);
339         if (data == NULL)
340                 return -ENOMEM;
341 
342         err = copy_ctl_value_from_user(card, data, userdata, valuep,
343                                        &type, &count);
344         if (err < 0)
345                 goto error;
346 
347         snd_power_lock(card);
348         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
349         if (err >= 0)
350                 err = snd_ctl_elem_write(card, file, data);
351         snd_power_unlock(card);
352         if (err >= 0)
353                 err = copy_ctl_value_to_user(userdata, valuep, data,
354                                              type, count);
355  error:
356         kfree(data);
357         return err;
358 }
359 
360 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
361                                          struct snd_ctl_elem_value32 __user *data32)
362 {
363         return ctl_elem_read_user(card, data32, &data32->value);
364 }
365 
366 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
367                                           struct snd_ctl_elem_value32 __user *data32)
368 {
369         return ctl_elem_write_user(file, data32, &data32->value);
370 }
371 
372 #ifdef CONFIG_X86_X32
373 static int snd_ctl_elem_read_user_x32(struct snd_card *card,
374                                       struct snd_ctl_elem_value_x32 __user *data32)
375 {
376         return ctl_elem_read_user(card, data32, &data32->value);
377 }
378 
379 static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
380                                        struct snd_ctl_elem_value_x32 __user *data32)
381 {
382         return ctl_elem_write_user(file, data32, &data32->value);
383 }
384 #endif /* CONFIG_X86_X32 */
385 
386 /* add or replace a user control */
387 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
388                                    struct snd_ctl_elem_info32 __user *data32,
389                                    int replace)
390 {
391         struct snd_ctl_elem_info *data;
392         int err;
393 
394         data = kzalloc(sizeof(*data), GFP_KERNEL);
395         if (! data)
396                 return -ENOMEM;
397 
398         err = -EFAULT;
399         /* id, type, access, count */ \
400         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
401             copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
402                 goto error;
403         if (get_user(data->owner, &data32->owner) ||
404             get_user(data->type, &data32->type))
405                 goto error;
406         switch (data->type) {
407         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
408         case SNDRV_CTL_ELEM_TYPE_INTEGER:
409                 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
410                     get_user(data->value.integer.max, &data32->value.integer.max) ||
411                     get_user(data->value.integer.step, &data32->value.integer.step))
412                         goto error;
413                 break;
414         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
415                 if (copy_from_user(&data->value.integer64,
416                                    &data32->value.integer64,
417                                    sizeof(data->value.integer64)))
418                         goto error;
419                 break;
420         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
421                 if (copy_from_user(&data->value.enumerated,
422                                    &data32->value.enumerated,
423                                    sizeof(data->value.enumerated)))
424                         goto error;
425                 data->value.enumerated.names_ptr =
426                         (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
427                 break;
428         default:
429                 break;
430         }
431         err = snd_ctl_elem_add(file, data, replace);
432  error:
433         kfree(data);
434         return err;
435 }  
436 
437 enum {
438         SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
439         SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
440         SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
441         SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
442         SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
443         SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
444 #ifdef CONFIG_X86_X32
445         SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
446         SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
447 #endif /* CONFIG_X86_X32 */
448 };
449 
450 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
451 {
452         struct snd_ctl_file *ctl;
453         struct snd_kctl_ioctl *p;
454         void __user *argp = compat_ptr(arg);
455         int err;
456 
457         ctl = file->private_data;
458         if (snd_BUG_ON(!ctl || !ctl->card))
459                 return -ENXIO;
460 
461         switch (cmd) {
462         case SNDRV_CTL_IOCTL_PVERSION:
463         case SNDRV_CTL_IOCTL_CARD_INFO:
464         case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
465         case SNDRV_CTL_IOCTL_POWER:
466         case SNDRV_CTL_IOCTL_POWER_STATE:
467         case SNDRV_CTL_IOCTL_ELEM_LOCK:
468         case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
469         case SNDRV_CTL_IOCTL_ELEM_REMOVE:
470         case SNDRV_CTL_IOCTL_TLV_READ:
471         case SNDRV_CTL_IOCTL_TLV_WRITE:
472         case SNDRV_CTL_IOCTL_TLV_COMMAND:
473                 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
474         case SNDRV_CTL_IOCTL_ELEM_LIST32:
475                 return snd_ctl_elem_list_compat(ctl->card, argp);
476         case SNDRV_CTL_IOCTL_ELEM_INFO32:
477                 return snd_ctl_elem_info_compat(ctl, argp);
478         case SNDRV_CTL_IOCTL_ELEM_READ32:
479                 return snd_ctl_elem_read_user_compat(ctl->card, argp);
480         case SNDRV_CTL_IOCTL_ELEM_WRITE32:
481                 return snd_ctl_elem_write_user_compat(ctl, argp);
482         case SNDRV_CTL_IOCTL_ELEM_ADD32:
483                 return snd_ctl_elem_add_compat(ctl, argp, 0);
484         case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
485                 return snd_ctl_elem_add_compat(ctl, argp, 1);
486 #ifdef CONFIG_X86_X32
487         case SNDRV_CTL_IOCTL_ELEM_READ_X32:
488                 return snd_ctl_elem_read_user_x32(ctl->card, argp);
489         case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
490                 return snd_ctl_elem_write_user_x32(ctl, argp);
491 #endif /* CONFIG_X86_X32 */
492         }
493 
494         down_read(&snd_ioctl_rwsem);
495         list_for_each_entry(p, &snd_control_compat_ioctls, list) {
496                 if (p->fioctl) {
497                         err = p->fioctl(ctl->card, ctl, cmd, arg);
498                         if (err != -ENOIOCTLCMD) {
499                                 up_read(&snd_ioctl_rwsem);
500                                 return err;
501                         }
502                 }
503         }
504         up_read(&snd_ioctl_rwsem);
505         return -ENOIOCTLCMD;
506 }
507 

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