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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 
174 /* get the value type and count of the control */
175 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
176                         int *countp)
177 {
178         struct snd_kcontrol *kctl;
179         struct snd_ctl_elem_info *info;
180         int err;
181 
182         down_read(&card->controls_rwsem);
183         kctl = snd_ctl_find_id(card, id);
184         if (! kctl) {
185                 up_read(&card->controls_rwsem);
186                 return -ENXIO;
187         }
188         info = kzalloc(sizeof(*info), GFP_KERNEL);
189         if (info == NULL) {
190                 up_read(&card->controls_rwsem);
191                 return -ENOMEM;
192         }
193         info->id = *id;
194         err = kctl->info(kctl, info);
195         up_read(&card->controls_rwsem);
196         if (err >= 0) {
197                 err = info->type;
198                 *countp = info->count;
199         }
200         kfree(info);
201         return err;
202 }
203 
204 static int get_elem_size(int type, int count)
205 {
206         switch (type) {
207         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
208                 return sizeof(s64) * count;
209         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
210                 return sizeof(int) * count;
211         case SNDRV_CTL_ELEM_TYPE_BYTES:
212                 return 512;
213         case SNDRV_CTL_ELEM_TYPE_IEC958:
214                 return sizeof(struct snd_aes_iec958);
215         default:
216                 return -1;
217         }
218 }
219 
220 static int copy_ctl_value_from_user(struct snd_card *card,
221                                     struct snd_ctl_elem_value *data,
222                                     struct snd_ctl_elem_value32 __user *data32,
223                                     int *typep, int *countp)
224 {
225         int i, type, size;
226         int uninitialized_var(count);
227         unsigned int indirect;
228 
229         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
230                 return -EFAULT;
231         if (get_user(indirect, &data32->indirect))
232                 return -EFAULT;
233         if (indirect)
234                 return -EINVAL;
235         type = get_ctl_type(card, &data->id, &count);
236         if (type < 0)
237                 return type;
238 
239         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
240             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
241                 for (i = 0; i < count; i++) {
242                         int val;
243                         if (get_user(val, &data32->value.integer[i]))
244                                 return -EFAULT;
245                         data->value.integer.value[i] = val;
246                 }
247         } else {
248                 size = get_elem_size(type, count);
249                 if (size < 0) {
250                         dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
251                         return -EINVAL;
252                 }
253                 if (copy_from_user(data->value.bytes.data,
254                                    data32->value.data, size))
255                         return -EFAULT;
256         }
257 
258         *typep = type;
259         *countp = count;
260         return 0;
261 }
262 
263 /* restore the value to 32bit */
264 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
265                                   struct snd_ctl_elem_value *data,
266                                   int type, int count)
267 {
268         int i, size;
269 
270         if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
271             type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
272                 for (i = 0; i < count; i++) {
273                         int val;
274                         val = data->value.integer.value[i];
275                         if (put_user(val, &data32->value.integer[i]))
276                                 return -EFAULT;
277                 }
278         } else {
279                 size = get_elem_size(type, count);
280                 if (copy_to_user(data32->value.data,
281                                  data->value.bytes.data, size))
282                         return -EFAULT;
283         }
284         return 0;
285 }
286 
287 static int snd_ctl_elem_read_user_compat(struct snd_card *card, 
288                                          struct snd_ctl_elem_value32 __user *data32)
289 {
290         struct snd_ctl_elem_value *data;
291         int err, type, count;
292 
293         data = kzalloc(sizeof(*data), GFP_KERNEL);
294         if (data == NULL)
295                 return -ENOMEM;
296 
297         if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
298                 goto error;
299 
300         snd_power_lock(card);
301         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
302         if (err >= 0)
303                 err = snd_ctl_elem_read(card, data);
304         snd_power_unlock(card);
305         if (err >= 0)
306                 err = copy_ctl_value_to_user(data32, data, type, count);
307  error:
308         kfree(data);
309         return err;
310 }
311 
312 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
313                                           struct snd_ctl_elem_value32 __user *data32)
314 {
315         struct snd_ctl_elem_value *data;
316         struct snd_card *card = file->card;
317         int err, type, count;
318 
319         data = kzalloc(sizeof(*data), GFP_KERNEL);
320         if (data == NULL)
321                 return -ENOMEM;
322 
323         if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
324                 goto error;
325 
326         snd_power_lock(card);
327         err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
328         if (err >= 0)
329                 err = snd_ctl_elem_write(card, file, data);
330         snd_power_unlock(card);
331         if (err >= 0)
332                 err = copy_ctl_value_to_user(data32, data, type, count);
333  error:
334         kfree(data);
335         return err;
336 }
337 
338 /* add or replace a user control */
339 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
340                                    struct snd_ctl_elem_info32 __user *data32,
341                                    int replace)
342 {
343         struct snd_ctl_elem_info *data;
344         int err;
345 
346         data = kzalloc(sizeof(*data), GFP_KERNEL);
347         if (! data)
348                 return -ENOMEM;
349 
350         err = -EFAULT;
351         /* id, type, access, count */ \
352         if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
353             copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
354                 goto error;
355         if (get_user(data->owner, &data32->owner) ||
356             get_user(data->type, &data32->type))
357                 goto error;
358         switch (data->type) {
359         case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
360         case SNDRV_CTL_ELEM_TYPE_INTEGER:
361                 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
362                     get_user(data->value.integer.max, &data32->value.integer.max) ||
363                     get_user(data->value.integer.step, &data32->value.integer.step))
364                         goto error;
365                 break;
366         case SNDRV_CTL_ELEM_TYPE_INTEGER64:
367                 if (copy_from_user(&data->value.integer64,
368                                    &data32->value.integer64,
369                                    sizeof(data->value.integer64)))
370                         goto error;
371                 break;
372         case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
373                 if (copy_from_user(&data->value.enumerated,
374                                    &data32->value.enumerated,
375                                    sizeof(data->value.enumerated)))
376                         goto error;
377                 data->value.enumerated.names_ptr =
378                         (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
379                 break;
380         default:
381                 break;
382         }
383         err = snd_ctl_elem_add(file, data, replace);
384  error:
385         kfree(data);
386         return err;
387 }  
388 
389 enum {
390         SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
391         SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
392         SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
393         SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
394         SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
395         SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
396 };
397 
398 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
399 {
400         struct snd_ctl_file *ctl;
401         struct snd_kctl_ioctl *p;
402         void __user *argp = compat_ptr(arg);
403         int err;
404 
405         ctl = file->private_data;
406         if (snd_BUG_ON(!ctl || !ctl->card))
407                 return -ENXIO;
408 
409         switch (cmd) {
410         case SNDRV_CTL_IOCTL_PVERSION:
411         case SNDRV_CTL_IOCTL_CARD_INFO:
412         case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
413         case SNDRV_CTL_IOCTL_POWER:
414         case SNDRV_CTL_IOCTL_POWER_STATE:
415         case SNDRV_CTL_IOCTL_ELEM_LOCK:
416         case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
417         case SNDRV_CTL_IOCTL_ELEM_REMOVE:
418         case SNDRV_CTL_IOCTL_TLV_READ:
419         case SNDRV_CTL_IOCTL_TLV_WRITE:
420         case SNDRV_CTL_IOCTL_TLV_COMMAND:
421                 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
422         case SNDRV_CTL_IOCTL_ELEM_LIST32:
423                 return snd_ctl_elem_list_compat(ctl->card, argp);
424         case SNDRV_CTL_IOCTL_ELEM_INFO32:
425                 return snd_ctl_elem_info_compat(ctl, argp);
426         case SNDRV_CTL_IOCTL_ELEM_READ32:
427                 return snd_ctl_elem_read_user_compat(ctl->card, argp);
428         case SNDRV_CTL_IOCTL_ELEM_WRITE32:
429                 return snd_ctl_elem_write_user_compat(ctl, argp);
430         case SNDRV_CTL_IOCTL_ELEM_ADD32:
431                 return snd_ctl_elem_add_compat(ctl, argp, 0);
432         case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
433                 return snd_ctl_elem_add_compat(ctl, argp, 1);
434         }
435 
436         down_read(&snd_ioctl_rwsem);
437         list_for_each_entry(p, &snd_control_compat_ioctls, list) {
438                 if (p->fioctl) {
439                         err = p->fioctl(ctl->card, ctl, cmd, arg);
440                         if (err != -ENOIOCTLCMD) {
441                                 up_read(&snd_ioctl_rwsem);
442                                 return err;
443                         }
444                 }
445         }
446         up_read(&snd_ioctl_rwsem);
447         return -ENOIOCTLCMD;
448 }
449 

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