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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-compat-ioctl32.c
blob6481212fda772c734e0c2222dde8611932cbdaf1
1 /*
2 * ioctl32.c: Conversion between 32bit and 64bit native ioctls.
3 * Separated from fs stuff by Arnd Bergmann <arnd@arndb.de>
4 *
5 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
6 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
7 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
8 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
9 * Copyright (C) 2005 Philippe De Muyter (phdm@macqel.be)
10 * Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
11 *
12 * These routines maintain argument size conversion between 32bit and 64bit
13 * ioctls.
14 */
15
16 #include <linux/compat.h>
17 #include <linux/module.h>
18 #include <linux/videodev2.h>
19 #include <linux/v4l2-subdev.h>
20 #include <media/v4l2-dev.h>
21 #include <media/v4l2-fh.h>
22 #include <media/v4l2-ctrls.h>
23 #include <media/v4l2-ioctl.h>
24
25 /**
26 * assign_in_user() - Copy from one __user var to another one
27 *
28 * @to: __user var where data will be stored
29 * @from: __user var where data will be retrieved.
30 *
31 * As this code very often needs to allocate userspace memory, it is easier
32 * to have a macro that will do both get_user() and put_user() at once.
33 *
34 * This function complements the macros defined at asm-generic/uaccess.h.
35 * It uses the same argument order as copy_in_user()
36 */
37 #define assign_in_user(to, from) \
38 ({ \
39 typeof(*from) __assign_tmp; \
40 \
41 get_user(__assign_tmp, from) || put_user(__assign_tmp, to); \
42 })
43
44 /**
45 * get_user_cast() - Stores at a kernelspace local var the contents from a
46 * pointer with userspace data that is not tagged with __user.
47 *
48 * @__x: var where data will be stored
49 * @__ptr: var where data will be retrieved.
50 *
51 * Sometimes we need to declare a pointer without __user because it
52 * comes from a pointer struct field that will be retrieved from userspace
53 * by the 64-bit native ioctl handler. This function ensures that the
54 * @__ptr will be cast to __user before calling get_user() in order to
55 * avoid warnings with static code analyzers like smatch.
56 */
57 #define get_user_cast(__x, __ptr) \
58 ({ \
59 get_user(__x, (typeof(*__ptr) __user *)(__ptr)); \
60 })
61
62 /**
63 * put_user_force() - Stores the contents of a kernelspace local var
64 * into a userspace pointer, removing any __user cast.
65 *
66 * @__x: var where data will be stored
67 * @__ptr: var where data will be retrieved.
68 *
69 * Sometimes we need to remove the __user attribute from some data,
70 * by passing the __force macro. This function ensures that the
71 * @__ptr will be cast with __force before calling put_user(), in order to
72 * avoid warnings with static code analyzers like smatch.
73 */
74 #define put_user_force(__x, __ptr) \
75 ({ \
76 put_user((typeof(*__x) __force *)(__x), __ptr); \
77 })
78
79 /**
80 * assign_in_user_cast() - Copy from one __user var to another one
81 *
82 * @to: __user var where data will be stored
83 * @from: var where data will be retrieved that needs to be cast to __user.
84 *
85 * As this code very often needs to allocate userspace memory, it is easier
86 * to have a macro that will do both get_user_cast() and put_user() at once.
87 *
88 * This function should be used instead of assign_in_user() when the @from
89 * variable was not declared as __user. See get_user_cast() for more details.
90 *
91 * This function complements the macros defined at asm-generic/uaccess.h.
92 * It uses the same argument order as copy_in_user()
93 */
94 #define assign_in_user_cast(to, from) \
95 ({ \
96 typeof(*from) __assign_tmp; \
97 \
98 get_user_cast(__assign_tmp, from) || put_user(__assign_tmp, to);\
99 })
100
101 /**
102 * native_ioctl - Ancillary function that calls the native 64 bits ioctl
103 * handler.
104 *
105 * @file: pointer to &struct file with the file handler
106 * @cmd: ioctl to be called
107 * @arg: arguments passed from/to the ioctl handler
108 *
109 * This function calls the native ioctl handler at v4l2-dev, e. g. v4l2_ioctl()
110 */
111 static long native_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
112 {
113 long ret = -ENOIOCTLCMD;
114
115 if (file->f_op->unlocked_ioctl)
116 ret = file->f_op->unlocked_ioctl(file, cmd, arg);
117
118 return ret;
119 }
120
121
122 /*
123 * Per-ioctl data copy handlers.
124 *
125 * Those come in pairs, with a get_v4l2_foo() and a put_v4l2_foo() routine,
126 * where "v4l2_foo" is the name of the V4L2 struct.
127 *
128 * They basically get two __user pointers, one with a 32-bits struct that
129 * came from the userspace call and a 64-bits struct, also allocated as
130 * userspace, but filled internally by do_video_ioctl().
131 *
132 * For ioctls that have pointers inside it, the functions will also
133 * receive an ancillary buffer with extra space, used to pass extra
134 * data to the routine.
135 */
136
137 struct v4l2_clip32 {
138 struct v4l2_rect c;
139 compat_caddr_t next;
140 };
141
142 struct v4l2_window32 {
143 struct v4l2_rect w;
144 __u32 field; /* enum v4l2_field */
145 __u32 chromakey;
146 compat_caddr_t clips; /* actually struct v4l2_clip32 * */
147 __u32 clipcount;
148 compat_caddr_t bitmap;
149 __u8 global_alpha;
150 };
151
152 static int get_v4l2_window32(struct v4l2_window __user *p64,
153 struct v4l2_window32 __user *p32,
154 void __user *aux_buf, u32 aux_space)
155 {
156 struct v4l2_clip32 __user *uclips;
157 struct v4l2_clip __user *kclips;
158 compat_caddr_t p;
159 u32 clipcount;
160
161 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
162 copy_in_user(&p64->w, &p32->w, sizeof(p32->w)) ||
163 assign_in_user(&p64->field, &p32->field) ||
164 assign_in_user(&p64->chromakey, &p32->chromakey) ||
165 assign_in_user(&p64->global_alpha, &p32->global_alpha) ||
166 get_user(clipcount, &p32->clipcount) ||
167 put_user(clipcount, &p64->clipcount))
168 return -EFAULT;
169 if (clipcount > 2048)
170 return -EINVAL;
171 if (!clipcount)
172 return put_user(NULL, &p64->clips);
173
174 if (get_user(p, &p32->clips))
175 return -EFAULT;
176 uclips = compat_ptr(p);
177 if (aux_space < clipcount * sizeof(*kclips))
178 return -EFAULT;
179 kclips = aux_buf;
180 if (put_user(kclips, &p64->clips))
181 return -EFAULT;
182
183 while (clipcount--) {
184 if (copy_in_user(&kclips->c, &uclips->c, sizeof(uclips->c)))
185 return -EFAULT;
186 if (put_user(clipcount ? kclips + 1 : NULL, &kclips->next))
187 return -EFAULT;
188 uclips++;
189 kclips++;
190 }
191 return 0;
192 }
193
194 static int put_v4l2_window32(struct v4l2_window __user *p64,
195 struct v4l2_window32 __user *p32)
196 {
197 struct v4l2_clip __user *kclips;
198 struct v4l2_clip32 __user *uclips;
199 compat_caddr_t p;
200 u32 clipcount;
201
202 if (copy_in_user(&p32->w, &p64->w, sizeof(p64->w)) ||
203 assign_in_user(&p32->field, &p64->field) ||
204 assign_in_user(&p32->chromakey, &p64->chromakey) ||
205 assign_in_user(&p32->global_alpha, &p64->global_alpha) ||
206 get_user(clipcount, &p64->clipcount) ||
207 put_user(clipcount, &p32->clipcount))
208 return -EFAULT;
209 if (!clipcount)
210 return 0;
211
212 if (get_user(kclips, &p64->clips))
213 return -EFAULT;
214 if (get_user(p, &p32->clips))
215 return -EFAULT;
216 uclips = compat_ptr(p);
217 while (clipcount--) {
218 if (copy_in_user(&uclips->c, &kclips->c, sizeof(uclips->c)))
219 return -EFAULT;
220 uclips++;
221 kclips++;
222 }
223 return 0;
224 }
225
226 struct v4l2_format32 {
227 __u32 type; /* enum v4l2_buf_type */
228 union {
229 struct v4l2_pix_format pix;
230 struct v4l2_pix_format_mplane pix_mp;
231 struct v4l2_window32 win;
232 struct v4l2_vbi_format vbi;
233 struct v4l2_sliced_vbi_format sliced;
234 struct v4l2_sdr_format sdr;
235 struct v4l2_meta_format meta;
236 __u8 raw_data[200]; /* user-defined */
237 } fmt;
238 };
239
240 /**
241 * struct v4l2_create_buffers32 - VIDIOC_CREATE_BUFS32 argument
242 * @index: on return, index of the first created buffer
243 * @count: entry: number of requested buffers,
244 * return: number of created buffers
245 * @memory: buffer memory type
246 * @format: frame format, for which buffers are requested
247 * @reserved: future extensions
248 */
249 struct v4l2_create_buffers32 {
250 __u32 index;
251 __u32 count;
252 __u32 memory; /* enum v4l2_memory */
253 struct v4l2_format32 format;
254 __u32 reserved[8];
255 };
256
257 static int __bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size)
258 {
259 u32 type;
260
261 if (get_user(type, &p32->type))
262 return -EFAULT;
263
264 switch (type) {
265 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
266 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: {
267 u32 clipcount;
268
269 if (get_user(clipcount, &p32->fmt.win.clipcount))
270 return -EFAULT;
271 if (clipcount > 2048)
272 return -EINVAL;
273 *size = clipcount * sizeof(struct v4l2_clip);
274 return 0;
275 }
276 default:
277 *size = 0;
278 return 0;
279 }
280 }
281
282 static int bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size)
283 {
284 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)))
285 return -EFAULT;
286 return __bufsize_v4l2_format(p32, size);
287 }
288
289 static int __get_v4l2_format32(struct v4l2_format __user *p64,
290 struct v4l2_format32 __user *p32,
291 void __user *aux_buf, u32 aux_space)
292 {
293 u32 type;
294
295 if (get_user(type, &p32->type) || put_user(type, &p64->type))
296 return -EFAULT;
297
298 switch (type) {
299 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
300 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
301 return copy_in_user(&p64->fmt.pix, &p32->fmt.pix,
302 sizeof(p64->fmt.pix)) ? -EFAULT : 0;
303 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
304 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
305 return copy_in_user(&p64->fmt.pix_mp, &p32->fmt.pix_mp,
306 sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0;
307 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
308 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
309 return get_v4l2_window32(&p64->fmt.win, &p32->fmt.win,
310 aux_buf, aux_space);
311 case V4L2_BUF_TYPE_VBI_CAPTURE:
312 case V4L2_BUF_TYPE_VBI_OUTPUT:
313 return copy_in_user(&p64->fmt.vbi, &p32->fmt.vbi,
314 sizeof(p64->fmt.vbi)) ? -EFAULT : 0;
315 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
316 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
317 return copy_in_user(&p64->fmt.sliced, &p32->fmt.sliced,
318 sizeof(p64->fmt.sliced)) ? -EFAULT : 0;
319 case V4L2_BUF_TYPE_SDR_CAPTURE:
320 case V4L2_BUF_TYPE_SDR_OUTPUT:
321 return copy_in_user(&p64->fmt.sdr, &p32->fmt.sdr,
322 sizeof(p64->fmt.sdr)) ? -EFAULT : 0;
323 case V4L2_BUF_TYPE_META_CAPTURE:
324 return copy_in_user(&p64->fmt.meta, &p32->fmt.meta,
325 sizeof(p64->fmt.meta)) ? -EFAULT : 0;
326 default:
327 return -EINVAL;
328 }
329 }
330
331 static int get_v4l2_format32(struct v4l2_format __user *p64,
332 struct v4l2_format32 __user *p32,
333 void __user *aux_buf, u32 aux_space)
334 {
335 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)))
336 return -EFAULT;
337 return __get_v4l2_format32(p64, p32, aux_buf, aux_space);
338 }
339
340 static int bufsize_v4l2_create(struct v4l2_create_buffers32 __user *p32,
341 u32 *size)
342 {
343 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)))
344 return -EFAULT;
345 return __bufsize_v4l2_format(&p32->format, size);
346 }
347
348 static int get_v4l2_create32(struct v4l2_create_buffers __user *p64,
349 struct v4l2_create_buffers32 __user *p32,
350 void __user *aux_buf, u32 aux_space)
351 {
352 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
353 copy_in_user(p64, p32,
354 offsetof(struct v4l2_create_buffers32, format)))
355 return -EFAULT;
356 return __get_v4l2_format32(&p64->format, &p32->format,
357 aux_buf, aux_space);
358 }
359
360 static int __put_v4l2_format32(struct v4l2_format __user *p64,
361 struct v4l2_format32 __user *p32)
362 {
363 u32 type;
364
365 if (get_user(type, &p64->type))
366 return -EFAULT;
367
368 switch (type) {
369 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
370 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
371 return copy_in_user(&p32->fmt.pix, &p64->fmt.pix,
372 sizeof(p64->fmt.pix)) ? -EFAULT : 0;
373 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
374 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
375 return copy_in_user(&p32->fmt.pix_mp, &p64->fmt.pix_mp,
376 sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0;
377 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
378 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
379 return put_v4l2_window32(&p64->fmt.win, &p32->fmt.win);
380 case V4L2_BUF_TYPE_VBI_CAPTURE:
381 case V4L2_BUF_TYPE_VBI_OUTPUT:
382 return copy_in_user(&p32->fmt.vbi, &p64->fmt.vbi,
383 sizeof(p64->fmt.vbi)) ? -EFAULT : 0;
384 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
385 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
386 return copy_in_user(&p32->fmt.sliced, &p64->fmt.sliced,
387 sizeof(p64->fmt.sliced)) ? -EFAULT : 0;
388 case V4L2_BUF_TYPE_SDR_CAPTURE:
389 case V4L2_BUF_TYPE_SDR_OUTPUT:
390 return copy_in_user(&p32->fmt.sdr, &p64->fmt.sdr,
391 sizeof(p64->fmt.sdr)) ? -EFAULT : 0;
392 case V4L2_BUF_TYPE_META_CAPTURE:
393 return copy_in_user(&p32->fmt.meta, &p64->fmt.meta,
394 sizeof(p64->fmt.meta)) ? -EFAULT : 0;
395 default:
396 return -EINVAL;
397 }
398 }
399
400 static int put_v4l2_format32(struct v4l2_format __user *p64,
401 struct v4l2_format32 __user *p32)
402 {
403 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)))
404 return -EFAULT;
405 return __put_v4l2_format32(p64, p32);
406 }
407
408 static int put_v4l2_create32(struct v4l2_create_buffers __user *p64,
409 struct v4l2_create_buffers32 __user *p32)
410 {
411 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
412 copy_in_user(p32, p64,
413 offsetof(struct v4l2_create_buffers32, format)) ||
414 copy_in_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
415 return -EFAULT;
416 return __put_v4l2_format32(&p64->format, &p32->format);
417 }
418
419 struct v4l2_standard32 {
420 __u32 index;
421 compat_u64 id;
422 __u8 name[24];
423 struct v4l2_fract frameperiod; /* Frames, not fields */
424 __u32 framelines;
425 __u32 reserved[4];
426 };
427
428 static int get_v4l2_standard32(struct v4l2_standard __user *p64,
429 struct v4l2_standard32 __user *p32)
430 {
431 /* other fields are not set by the user, nor used by the driver */
432 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
433 assign_in_user(&p64->index, &p32->index))
434 return -EFAULT;
435 return 0;
436 }
437
438 static int put_v4l2_standard32(struct v4l2_standard __user *p64,
439 struct v4l2_standard32 __user *p32)
440 {
441 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
442 assign_in_user(&p32->index, &p64->index) ||
443 assign_in_user(&p32->id, &p64->id) ||
444 copy_in_user(p32->name, p64->name, sizeof(p32->name)) ||
445 copy_in_user(&p32->frameperiod, &p64->frameperiod,
446 sizeof(p32->frameperiod)) ||
447 assign_in_user(&p32->framelines, &p64->framelines) ||
448 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
449 return -EFAULT;
450 return 0;
451 }
452
453 struct v4l2_plane32 {
454 __u32 bytesused;
455 __u32 length;
456 union {
457 __u32 mem_offset;
458 compat_long_t userptr;
459 __s32 fd;
460 } m;
461 __u32 data_offset;
462 __u32 reserved[11];
463 };
464
465 struct v4l2_buffer32 {
466 __u32 index;
467 __u32 type; /* enum v4l2_buf_type */
468 __u32 bytesused;
469 __u32 flags;
470 __u32 field; /* enum v4l2_field */
471 struct compat_timeval timestamp;
472 struct v4l2_timecode timecode;
473 __u32 sequence;
474
475 /* memory location */
476 __u32 memory; /* enum v4l2_memory */
477 union {
478 __u32 offset;
479 compat_long_t userptr;
480 compat_caddr_t planes;
481 __s32 fd;
482 } m;
483 __u32 length;
484 __u32 reserved2;
485 __u32 reserved;
486 };
487
488 static int get_v4l2_plane32(struct v4l2_plane __user *p64,
489 struct v4l2_plane32 __user *p32,
490 enum v4l2_memory memory)
491 {
492 compat_ulong_t p;
493
494 if (copy_in_user(p64, p32, 2 * sizeof(__u32)) ||
495 copy_in_user(&p64->data_offset, &p32->data_offset,
496 sizeof(p64->data_offset)))
497 return -EFAULT;
498
499 switch (memory) {
500 case V4L2_MEMORY_MMAP:
501 case V4L2_MEMORY_OVERLAY:
502 if (copy_in_user(&p64->m.mem_offset, &p32->m.mem_offset,
503 sizeof(p32->m.mem_offset)))
504 return -EFAULT;
505 break;
506 case V4L2_MEMORY_USERPTR:
507 if (get_user(p, &p32->m.userptr) ||
508 put_user((unsigned long)compat_ptr(p), &p64->m.userptr))
509 return -EFAULT;
510 break;
511 case V4L2_MEMORY_DMABUF:
512 if (copy_in_user(&p64->m.fd, &p32->m.fd, sizeof(p32->m.fd)))
513 return -EFAULT;
514 break;
515 }
516
517 return 0;
518 }
519
520 static int put_v4l2_plane32(struct v4l2_plane __user *p64,
521 struct v4l2_plane32 __user *p32,
522 enum v4l2_memory memory)
523 {
524 unsigned long p;
525
526 if (copy_in_user(p32, p64, 2 * sizeof(__u32)) ||
527 copy_in_user(&p32->data_offset, &p64->data_offset,
528 sizeof(p64->data_offset)))
529 return -EFAULT;
530
531 switch (memory) {
532 case V4L2_MEMORY_MMAP:
533 case V4L2_MEMORY_OVERLAY:
534 if (copy_in_user(&p32->m.mem_offset, &p64->m.mem_offset,
535 sizeof(p64->m.mem_offset)))
536 return -EFAULT;
537 break;
538 case V4L2_MEMORY_USERPTR:
539 if (get_user(p, &p64->m.userptr) ||
540 put_user((compat_ulong_t)ptr_to_compat((void __user *)p),
541 &p32->m.userptr))
542 return -EFAULT;
543 break;
544 case V4L2_MEMORY_DMABUF:
545 if (copy_in_user(&p32->m.fd, &p64->m.fd, sizeof(p64->m.fd)))
546 return -EFAULT;
547 break;
548 }
549
550 return 0;
551 }
552
553 static int bufsize_v4l2_buffer(struct v4l2_buffer32 __user *p32, u32 *size)
554 {
555 u32 type;
556 u32 length;
557
558 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
559 get_user(type, &p32->type) ||
560 get_user(length, &p32->length))
561 return -EFAULT;
562
563 if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
564 if (length > VIDEO_MAX_PLANES)
565 return -EINVAL;
566
567 /*
568 * We don't really care if userspace decides to kill itself
569 * by passing a very big length value
570 */
571 *size = length * sizeof(struct v4l2_plane);
572 } else {
573 *size = 0;
574 }
575 return 0;
576 }
577
578 static int get_v4l2_buffer32(struct v4l2_buffer __user *p64,
579 struct v4l2_buffer32 __user *p32,
580 void __user *aux_buf, u32 aux_space)
581 {
582 u32 type;
583 u32 length;
584 enum v4l2_memory memory;
585 struct v4l2_plane32 __user *uplane32;
586 struct v4l2_plane __user *uplane;
587 compat_caddr_t p;
588 int ret;
589
590 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
591 assign_in_user(&p64->index, &p32->index) ||
592 get_user(type, &p32->type) ||
593 put_user(type, &p64->type) ||
594 assign_in_user(&p64->flags, &p32->flags) ||
595 get_user(memory, &p32->memory) ||
596 put_user(memory, &p64->memory) ||
597 get_user(length, &p32->length) ||
598 put_user(length, &p64->length))
599 return -EFAULT;
600
601 if (V4L2_TYPE_IS_OUTPUT(type))
602 if (assign_in_user(&p64->bytesused, &p32->bytesused) ||
603 assign_in_user(&p64->field, &p32->field) ||
604 assign_in_user(&p64->timestamp.tv_sec,
605 &p32->timestamp.tv_sec) ||
606 assign_in_user(&p64->timestamp.tv_usec,
607 &p32->timestamp.tv_usec))
608 return -EFAULT;
609
610 if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
611 u32 num_planes = length;
612
613 if (num_planes == 0) {
614 /*
615 * num_planes == 0 is legal, e.g. when userspace doesn't
616 * need planes array on DQBUF
617 */
618 return put_user(NULL, &p64->m.planes);
619 }
620 if (num_planes > VIDEO_MAX_PLANES)
621 return -EINVAL;
622
623 if (get_user(p, &p32->m.planes))
624 return -EFAULT;
625
626 uplane32 = compat_ptr(p);
627 if (!access_ok(VERIFY_READ, uplane32,
628 num_planes * sizeof(*uplane32)))
629 return -EFAULT;
630
631 /*
632 * We don't really care if userspace decides to kill itself
633 * by passing a very big num_planes value
634 */
635 if (aux_space < num_planes * sizeof(*uplane))
636 return -EFAULT;
637
638 uplane = aux_buf;
639 if (put_user_force(uplane, &p64->m.planes))
640 return -EFAULT;
641
642 while (num_planes--) {
643 ret = get_v4l2_plane32(uplane, uplane32, memory);
644 if (ret)
645 return ret;
646 uplane++;
647 uplane32++;
648 }
649 } else {
650 switch (memory) {
651 case V4L2_MEMORY_MMAP:
652 case V4L2_MEMORY_OVERLAY:
653 if (assign_in_user(&p64->m.offset, &p32->m.offset))
654 return -EFAULT;
655 break;
656 case V4L2_MEMORY_USERPTR: {
657 compat_ulong_t userptr;
658
659 if (get_user(userptr, &p32->m.userptr) ||
660 put_user((unsigned long)compat_ptr(userptr),
661 &p64->m.userptr))
662 return -EFAULT;
663 break;
664 }
665 case V4L2_MEMORY_DMABUF:
666 if (assign_in_user(&p64->m.fd, &p32->m.fd))
667 return -EFAULT;
668 break;
669 }
670 }
671
672 return 0;
673 }
674
675 static int put_v4l2_buffer32(struct v4l2_buffer __user *p64,
676 struct v4l2_buffer32 __user *p32)
677 {
678 u32 type;
679 u32 length;
680 enum v4l2_memory memory;
681 struct v4l2_plane32 __user *uplane32;
682 struct v4l2_plane *uplane;
683 compat_caddr_t p;
684 int ret;
685
686 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
687 assign_in_user(&p32->index, &p64->index) ||
688 get_user(type, &p64->type) ||
689 put_user(type, &p32->type) ||
690 assign_in_user(&p32->flags, &p64->flags) ||
691 get_user(memory, &p64->memory) ||
692 put_user(memory, &p32->memory))
693 return -EFAULT;
694
695 if (assign_in_user(&p32->bytesused, &p64->bytesused) ||
696 assign_in_user(&p32->field, &p64->field) ||
697 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) ||
698 assign_in_user(&p32->timestamp.tv_usec, &p64->timestamp.tv_usec) ||
699 copy_in_user(&p32->timecode, &p64->timecode, sizeof(p64->timecode)) ||
700 assign_in_user(&p32->sequence, &p64->sequence) ||
701 assign_in_user(&p32->reserved2, &p64->reserved2) ||
702 assign_in_user(&p32->reserved, &p64->reserved) ||
703 get_user(length, &p64->length) ||
704 put_user(length, &p32->length))
705 return -EFAULT;
706
707 if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
708 u32 num_planes = length;
709
710 if (num_planes == 0)
711 return 0;
712 /* We need to define uplane without __user, even though
713 * it does point to data in userspace here. The reason is
714 * that v4l2-ioctl.c copies it from userspace to kernelspace,
715 * so its definition in videodev2.h doesn't have a
716 * __user markup. Defining uplane with __user causes
717 * smatch warnings, so instead declare it without __user
718 * and cast it as a userspace pointer to put_v4l2_plane32().
719 */
720 if (get_user(uplane, &p64->m.planes))
721 return -EFAULT;
722 if (get_user(p, &p32->m.planes))
723 return -EFAULT;
724 uplane32 = compat_ptr(p);
725
726 while (num_planes--) {
727 ret = put_v4l2_plane32((void __user *)uplane,
728 uplane32, memory);
729 if (ret)
730 return ret;
731 ++uplane;
732 ++uplane32;
733 }
734 } else {
735 switch (memory) {
736 case V4L2_MEMORY_MMAP:
737 case V4L2_MEMORY_OVERLAY:
738 if (assign_in_user(&p32->m.offset, &p64->m.offset))
739 return -EFAULT;
740 break;
741 case V4L2_MEMORY_USERPTR:
742 if (assign_in_user(&p32->m.userptr, &p64->m.userptr))
743 return -EFAULT;
744 break;
745 case V4L2_MEMORY_DMABUF:
746 if (assign_in_user(&p32->m.fd, &p64->m.fd))
747 return -EFAULT;
748 break;
749 }
750 }
751
752 return 0;
753 }
754
755 struct v4l2_framebuffer32 {
756 __u32 capability;
757 __u32 flags;
758 compat_caddr_t base;
759 struct {
760 __u32 width;
761 __u32 height;
762 __u32 pixelformat;
763 __u32 field;
764 __u32 bytesperline;
765 __u32 sizeimage;
766 __u32 colorspace;
767 __u32 priv;
768 } fmt;
769 };
770
771 static int get_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64,
772 struct v4l2_framebuffer32 __user *p32)
773 {
774 compat_caddr_t tmp;
775
776 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
777 get_user(tmp, &p32->base) ||
778 put_user_force(compat_ptr(tmp), &p64->base) ||
779 assign_in_user(&p64->capability, &p32->capability) ||
780 assign_in_user(&p64->flags, &p32->flags) ||
781 copy_in_user(&p64->fmt, &p32->fmt, sizeof(p64->fmt)))
782 return -EFAULT;
783 return 0;
784 }
785
786 static int put_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64,
787 struct v4l2_framebuffer32 __user *p32)
788 {
789 void *base;
790
791 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
792 get_user(base, &p64->base) ||
793 put_user(ptr_to_compat((void __user *)base), &p32->base) ||
794 assign_in_user(&p32->capability, &p64->capability) ||
795 assign_in_user(&p32->flags, &p64->flags) ||
796 copy_in_user(&p32->fmt, &p64->fmt, sizeof(p64->fmt)))
797 return -EFAULT;
798 return 0;
799 }
800
801 struct v4l2_input32 {
802 __u32 index; /* Which input */
803 __u8 name[32]; /* Label */
804 __u32 type; /* Type of input */
805 __u32 audioset; /* Associated audios (bitfield) */
806 __u32 tuner; /* Associated tuner */
807 compat_u64 std;
808 __u32 status;
809 __u32 capabilities;
810 __u32 reserved[3];
811 };
812
813 /*
814 * The 64-bit v4l2_input struct has extra padding at the end of the struct.
815 * Otherwise it is identical to the 32-bit version.
816 */
817 static inline int get_v4l2_input32(struct v4l2_input __user *p64,
818 struct v4l2_input32 __user *p32)
819 {
820 if (copy_in_user(p64, p32, sizeof(*p32)))
821 return -EFAULT;
822 return 0;
823 }
824
825 static inline int put_v4l2_input32(struct v4l2_input __user *p64,
826 struct v4l2_input32 __user *p32)
827 {
828 if (copy_in_user(p32, p64, sizeof(*p32)))
829 return -EFAULT;
830 return 0;
831 }
832
833 struct v4l2_ext_controls32 {
834 __u32 which;
835 __u32 count;
836 __u32 error_idx;
837 __u32 reserved[2];
838 compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */
839 };
840
841 struct v4l2_ext_control32 {
842 __u32 id;
843 __u32 size;
844 __u32 reserved2[1];
845 union {
846 __s32 value;
847 __s64 value64;
848 compat_caddr_t string; /* actually char * */
849 };
850 } __attribute__ ((packed));
851
852 /* Return true if this control is a pointer type. */
853 static inline bool ctrl_is_pointer(struct file *file, u32 id)
854 {
855 struct video_device *vdev = video_devdata(file);
856 struct v4l2_fh *fh = NULL;
857 struct v4l2_ctrl_handler *hdl = NULL;
858 struct v4l2_query_ext_ctrl qec = { id };
859 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;
860
861 if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags))
862 fh = file->private_data;
863
864 if (fh && fh->ctrl_handler)
865 hdl = fh->ctrl_handler;
866 else if (vdev->ctrl_handler)
867 hdl = vdev->ctrl_handler;
868
869 if (hdl) {
870 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id);
871
872 return ctrl && ctrl->is_ptr;
873 }
874
875 if (!ops || !ops->vidioc_query_ext_ctrl)
876 return false;
877
878 return !ops->vidioc_query_ext_ctrl(file, fh, &qec) &&
879 (qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD);
880 }
881
882 static int bufsize_v4l2_ext_controls(struct v4l2_ext_controls32 __user *p32,
883 u32 *size)
884 {
885 u32 count;
886
887 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
888 get_user(count, &p32->count))
889 return -EFAULT;
890 if (count > V4L2_CID_MAX_CTRLS)
891 return -EINVAL;
892 *size = count * sizeof(struct v4l2_ext_control);
893 return 0;
894 }
895
896 static int get_v4l2_ext_controls32(struct file *file,
897 struct v4l2_ext_controls __user *p64,
898 struct v4l2_ext_controls32 __user *p32,
899 void __user *aux_buf, u32 aux_space)
900 {
901 struct v4l2_ext_control32 __user *ucontrols;
902 struct v4l2_ext_control __user *kcontrols;
903 u32 count;
904 u32 n;
905 compat_caddr_t p;
906
907 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
908 assign_in_user(&p64->which, &p32->which) ||
909 get_user(count, &p32->count) ||
910 put_user(count, &p64->count) ||
911 assign_in_user(&p64->error_idx, &p32->error_idx) ||
912 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved)))
913 return -EFAULT;
914
915 if (count == 0)
916 return put_user(NULL, &p64->controls);
917 if (count > V4L2_CID_MAX_CTRLS)
918 return -EINVAL;
919 if (get_user(p, &p32->controls))
920 return -EFAULT;
921 ucontrols = compat_ptr(p);
922 if (!access_ok(VERIFY_READ, ucontrols, count * sizeof(*ucontrols)))
923 return -EFAULT;
924 if (aux_space < count * sizeof(*kcontrols))
925 return -EFAULT;
926 kcontrols = aux_buf;
927 if (put_user_force(kcontrols, &p64->controls))
928 return -EFAULT;
929
930 for (n = 0; n < count; n++) {
931 u32 id;
932
933 if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols)))
934 return -EFAULT;
935
936 if (get_user(id, &kcontrols->id))
937 return -EFAULT;
938
939 if (ctrl_is_pointer(file, id)) {
940 void __user *s;
941
942 if (get_user(p, &ucontrols->string))
943 return -EFAULT;
944 s = compat_ptr(p);
945 if (put_user(s, &kcontrols->string))
946 return -EFAULT;
947 }
948 ucontrols++;
949 kcontrols++;
950 }
951 return 0;
952 }
953
954 static int put_v4l2_ext_controls32(struct file *file,
955 struct v4l2_ext_controls __user *p64,
956 struct v4l2_ext_controls32 __user *p32)
957 {
958 struct v4l2_ext_control32 __user *ucontrols;
959 struct v4l2_ext_control *kcontrols;
960 u32 count;
961 u32 n;
962 compat_caddr_t p;
963
964 /*
965 * We need to define kcontrols without __user, even though it does
966 * point to data in userspace here. The reason is that v4l2-ioctl.c
967 * copies it from userspace to kernelspace, so its definition in
968 * videodev2.h doesn't have a __user markup. Defining kcontrols
969 * with __user causes smatch warnings, so instead declare it
970 * without __user and cast it as a userspace pointer where needed.
971 */
972 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
973 assign_in_user(&p32->which, &p64->which) ||
974 get_user(count, &p64->count) ||
975 put_user(count, &p32->count) ||
976 assign_in_user(&p32->error_idx, &p64->error_idx) ||
977 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)) ||
978 get_user(kcontrols, &p64->controls))
979 return -EFAULT;
980
981 if (!count || count > (U32_MAX/sizeof(*ucontrols)))
982 return 0;
983 if (get_user(p, &p32->controls))
984 return -EFAULT;
985 ucontrols = compat_ptr(p);
986 if (!access_ok(VERIFY_WRITE, ucontrols, count * sizeof(*ucontrols)))
987 return -EFAULT;
988
989 for (n = 0; n < count; n++) {
990 unsigned int size = sizeof(*ucontrols);
991 u32 id;
992
993 if (get_user_cast(id, &kcontrols->id) ||
994 put_user(id, &ucontrols->id) ||
995 assign_in_user_cast(&ucontrols->size, &kcontrols->size) ||
996 copy_in_user(&ucontrols->reserved2,
997 (void __user *)&kcontrols->reserved2,
998 sizeof(ucontrols->reserved2)))
999 return -EFAULT;
1000
1001 /*
1002 * Do not modify the pointer when copying a pointer control.
1003 * The contents of the pointer was changed, not the pointer
1004 * itself.
1005 */
1006 if (ctrl_is_pointer(file, id))
1007 size -= sizeof(ucontrols->value64);
1008
1009 if (copy_in_user(ucontrols,
1010 (void __user *)kcontrols, size))
1011 return -EFAULT;
1012
1013 ucontrols++;
1014 kcontrols++;
1015 }
1016 return 0;
1017 }
1018
1019 struct v4l2_event32 {
1020 __u32 type;
1021 union {
1022 compat_s64 value64;
1023 __u8 data[64];
1024 } u;
1025 __u32 pending;
1026 __u32 sequence;
1027 struct compat_timespec timestamp;
1028 __u32 id;
1029 __u32 reserved[8];
1030 };
1031
1032 static int put_v4l2_event32(struct v4l2_event __user *p64,
1033 struct v4l2_event32 __user *p32)
1034 {
1035 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
1036 assign_in_user(&p32->type, &p64->type) ||
1037 copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) ||
1038 assign_in_user(&p32->pending, &p64->pending) ||
1039 assign_in_user(&p32->sequence, &p64->sequence) ||
1040 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) ||
1041 assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) ||
1042 assign_in_user(&p32->id, &p64->id) ||
1043 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
1044 return -EFAULT;
1045 return 0;
1046 }
1047
1048 struct v4l2_edid32 {
1049 __u32 pad;
1050 __u32 start_block;
1051 __u32 blocks;
1052 __u32 reserved[5];
1053 compat_caddr_t edid;
1054 };
1055
1056 static int get_v4l2_edid32(struct v4l2_edid __user *p64,
1057 struct v4l2_edid32 __user *p32)
1058 {
1059 compat_uptr_t tmp;
1060
1061 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
1062 assign_in_user(&p64->pad, &p32->pad) ||
1063 assign_in_user(&p64->start_block, &p32->start_block) ||
1064 assign_in_user_cast(&p64->blocks, &p32->blocks) ||
1065 get_user(tmp, &p32->edid) ||
1066 put_user_force(compat_ptr(tmp), &p64->edid) ||
1067 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved)))
1068 return -EFAULT;
1069 return 0;
1070 }
1071
1072 static int put_v4l2_edid32(struct v4l2_edid __user *p64,
1073 struct v4l2_edid32 __user *p32)
1074 {
1075 void *edid;
1076
1077 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
1078 assign_in_user(&p32->pad, &p64->pad) ||
1079 assign_in_user(&p32->start_block, &p64->start_block) ||
1080 assign_in_user(&p32->blocks, &p64->blocks) ||
1081 get_user(edid, &p64->edid) ||
1082 put_user(ptr_to_compat((void __user *)edid), &p32->edid) ||
1083 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
1084 return -EFAULT;
1085 return 0;
1086 }
1087
1088 /*
1089 * List of ioctls that require 32-bits/64-bits conversion
1090 *
1091 * The V4L2 ioctls that aren't listed there don't have pointer arguments
1092 * and the struct size is identical for both 32 and 64 bits versions, so
1093 * they don't need translations.
1094 */
1095
1096 #define VIDIOC_G_FMT32 _IOWR('V', 4, struct v4l2_format32)
1097 #define VIDIOC_S_FMT32 _IOWR('V', 5, struct v4l2_format32)
1098 #define VIDIOC_QUERYBUF32 _IOWR('V', 9, struct v4l2_buffer32)
1099 #define VIDIOC_G_FBUF32 _IOR ('V', 10, struct v4l2_framebuffer32)
1100 #define VIDIOC_S_FBUF32 _IOW ('V', 11, struct v4l2_framebuffer32)
1101 #define VIDIOC_QBUF32 _IOWR('V', 15, struct v4l2_buffer32)
1102 #define VIDIOC_DQBUF32 _IOWR('V', 17, struct v4l2_buffer32)
1103 #define VIDIOC_ENUMSTD32 _IOWR('V', 25, struct v4l2_standard32)
1104 #define VIDIOC_ENUMINPUT32 _IOWR('V', 26, struct v4l2_input32)
1105 #define VIDIOC_G_EDID32 _IOWR('V', 40, struct v4l2_edid32)
1106 #define VIDIOC_S_EDID32 _IOWR('V', 41, struct v4l2_edid32)
1107 #define VIDIOC_TRY_FMT32 _IOWR('V', 64, struct v4l2_format32)
1108 #define VIDIOC_G_EXT_CTRLS32 _IOWR('V', 71, struct v4l2_ext_controls32)
1109 #define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32)
1110 #define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32)
1111 #define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32)
1112 #define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32)
1113 #define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32)
1114
1115 #define VIDIOC_OVERLAY32 _IOW ('V', 14, s32)
1116 #define VIDIOC_STREAMON32 _IOW ('V', 18, s32)
1117 #define VIDIOC_STREAMOFF32 _IOW ('V', 19, s32)
1118 #define VIDIOC_G_INPUT32 _IOR ('V', 38, s32)
1119 #define VIDIOC_S_INPUT32 _IOWR('V', 39, s32)
1120 #define VIDIOC_G_OUTPUT32 _IOR ('V', 46, s32)
1121 #define VIDIOC_S_OUTPUT32 _IOWR('V', 47, s32)
1122
1123 /**
1124 * alloc_userspace() - Allocates a 64-bits userspace pointer compatible
1125 * for calling the native 64-bits version of an ioctl.
1126 *
1127 * @size: size of the structure itself to be allocated.
1128 * @aux_space: extra size needed to store "extra" data, e.g. space for
1129 * other __user data that is pointed to fields inside the
1130 * structure.
1131 * @new_p64: pointer to a pointer to be filled with the allocated struct.
1132 *
1133 * Return:
1134 *
1135 * if it can't allocate memory, either -ENOMEM or -EFAULT will be returned.
1136 * Zero otherwise.
1137 */
1138 static int alloc_userspace(unsigned int size, u32 aux_space,
1139 void __user **new_p64)
1140 {
1141 *new_p64 = compat_alloc_user_space(size + aux_space);
1142 if (!*new_p64)
1143 return -ENOMEM;
1144 if (clear_user(*new_p64, size))
1145 return -EFAULT;
1146 return 0;
1147 }
1148
1149 /**
1150 * do_video_ioctl() - Ancillary function with handles a compat32 ioctl call
1151 *
1152 * @file: pointer to &struct file with the file handler
1153 * @cmd: ioctl to be called
1154 * @arg: arguments passed from/to the ioctl handler
1155 *
1156 * This function is called when a 32 bits application calls a V4L2 ioctl
1157 * and the Kernel is compiled with 64 bits.
1158 *
1159 * This function is called by v4l2_compat_ioctl32() when the function is
1160 * not private to some specific driver.
1161 *
1162 * It converts a 32-bits struct into a 64 bits one, calls the native 64-bits
1163 * ioctl handler and fills back the 32-bits struct with the results of the
1164 * native call.
1165 */
1166 static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1167 {
1168 void __user *p32 = compat_ptr(arg);
1169 void __user *new_p64 = NULL;
1170 void __user *aux_buf;
1171 u32 aux_space;
1172 int compatible_arg = 1;
1173 long err = 0;
1174
1175 /*
1176 * 1. When struct size is different, converts the command.
1177 */
1178 switch (cmd) {
1179 case VIDIOC_G_FMT32: cmd = VIDIOC_G_FMT; break;
1180 case VIDIOC_S_FMT32: cmd = VIDIOC_S_FMT; break;
1181 case VIDIOC_QUERYBUF32: cmd = VIDIOC_QUERYBUF; break;
1182 case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break;
1183 case VIDIOC_S_FBUF32: cmd = VIDIOC_S_FBUF; break;
1184 case VIDIOC_QBUF32: cmd = VIDIOC_QBUF; break;
1185 case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break;
1186 case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break;
1187 case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break;
1188 case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break;
1189 case VIDIOC_G_EXT_CTRLS32: cmd = VIDIOC_G_EXT_CTRLS; break;
1190 case VIDIOC_S_EXT_CTRLS32: cmd = VIDIOC_S_EXT_CTRLS; break;
1191 case VIDIOC_TRY_EXT_CTRLS32: cmd = VIDIOC_TRY_EXT_CTRLS; break;
1192 case VIDIOC_DQEVENT32: cmd = VIDIOC_DQEVENT; break;
1193 case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break;
1194 case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break;
1195 case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break;
1196 case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break;
1197 case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break;
1198 case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break;
1199 case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break;
1200 case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break;
1201 case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break;
1202 case VIDIOC_G_EDID32: cmd = VIDIOC_G_EDID; break;
1203 case VIDIOC_S_EDID32: cmd = VIDIOC_S_EDID; break;
1204 }
1205
1206 /*
1207 * 2. Allocates a 64-bits userspace pointer to store the
1208 * values of the ioctl and copy data from the 32-bits __user
1209 * argument into it.
1210 */
1211 switch (cmd) {
1212 case VIDIOC_OVERLAY:
1213 case VIDIOC_STREAMON:
1214 case VIDIOC_STREAMOFF:
1215 case VIDIOC_S_INPUT:
1216 case VIDIOC_S_OUTPUT:
1217 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64);
1218 if (!err && assign_in_user((unsigned int __user *)new_p64,
1219 (compat_uint_t __user *)p32))
1220 err = -EFAULT;
1221 compatible_arg = 0;
1222 break;
1223
1224 case VIDIOC_G_INPUT:
1225 case VIDIOC_G_OUTPUT:
1226 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64);
1227 compatible_arg = 0;
1228 break;
1229
1230 case VIDIOC_G_EDID:
1231 case VIDIOC_S_EDID:
1232 err = alloc_userspace(sizeof(struct v4l2_edid), 0, &new_p64);
1233 if (!err)
1234 err = get_v4l2_edid32(new_p64, p32);
1235 compatible_arg = 0;
1236 break;
1237
1238 case VIDIOC_G_FMT:
1239 case VIDIOC_S_FMT:
1240 case VIDIOC_TRY_FMT:
1241 err = bufsize_v4l2_format(p32, &aux_space);
1242 if (!err)
1243 err = alloc_userspace(sizeof(struct v4l2_format),
1244 aux_space, &new_p64);
1245 if (!err) {
1246 aux_buf = new_p64 + sizeof(struct v4l2_format);
1247 err = get_v4l2_format32(new_p64, p32,
1248 aux_buf, aux_space);
1249 }
1250 compatible_arg = 0;
1251 break;
1252
1253 case VIDIOC_CREATE_BUFS:
1254 err = bufsize_v4l2_create(p32, &aux_space);
1255 if (!err)
1256 err = alloc_userspace(sizeof(struct v4l2_create_buffers),
1257 aux_space, &new_p64);
1258 if (!err) {
1259 aux_buf = new_p64 + sizeof(struct v4l2_create_buffers);
1260 err = get_v4l2_create32(new_p64, p32,
1261 aux_buf, aux_space);
1262 }
1263 compatible_arg = 0;
1264 break;
1265
1266 case VIDIOC_PREPARE_BUF:
1267 case VIDIOC_QUERYBUF:
1268 case VIDIOC_QBUF:
1269 case VIDIOC_DQBUF:
1270 err = bufsize_v4l2_buffer(p32, &aux_space);
1271 if (!err)
1272 err = alloc_userspace(sizeof(struct v4l2_buffer),
1273 aux_space, &new_p64);
1274 if (!err) {
1275 aux_buf = new_p64 + sizeof(struct v4l2_buffer);
1276 err = get_v4l2_buffer32(new_p64, p32,
1277 aux_buf, aux_space);
1278 }
1279 compatible_arg = 0;
1280 break;
1281
1282 case VIDIOC_S_FBUF:
1283 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0,
1284 &new_p64);
1285 if (!err)
1286 err = get_v4l2_framebuffer32(new_p64, p32);
1287 compatible_arg = 0;
1288 break;
1289
1290 case VIDIOC_G_FBUF:
1291 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0,
1292 &new_p64);
1293 compatible_arg = 0;
1294 break;
1295
1296 case VIDIOC_ENUMSTD:
1297 err = alloc_userspace(sizeof(struct v4l2_standard), 0,
1298 &new_p64);
1299 if (!err)
1300 err = get_v4l2_standard32(new_p64, p32);
1301 compatible_arg = 0;
1302 break;
1303
1304 case VIDIOC_ENUMINPUT:
1305 err = alloc_userspace(sizeof(struct v4l2_input), 0, &new_p64);
1306 if (!err)
1307 err = get_v4l2_input32(new_p64, p32);
1308 compatible_arg = 0;
1309 break;
1310
1311 case VIDIOC_G_EXT_CTRLS:
1312 case VIDIOC_S_EXT_CTRLS:
1313 case VIDIOC_TRY_EXT_CTRLS:
1314 err = bufsize_v4l2_ext_controls(p32, &aux_space);
1315 if (!err)
1316 err = alloc_userspace(sizeof(struct v4l2_ext_controls),
1317 aux_space, &new_p64);
1318 if (!err) {
1319 aux_buf = new_p64 + sizeof(struct v4l2_ext_controls);
1320 err = get_v4l2_ext_controls32(file, new_p64, p32,
1321 aux_buf, aux_space);
1322 }
1323 compatible_arg = 0;
1324 break;
1325 case VIDIOC_DQEVENT:
1326 err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64);
1327 compatible_arg = 0;
1328 break;
1329 }
1330 if (err)
1331 return err;
1332
1333 /*
1334 * 3. Calls the native 64-bits ioctl handler.
1335 *
1336 * For the functions where a conversion was not needed,
1337 * compatible_arg is true, and it will call it with the arguments
1338 * provided by userspace and stored at @p32 var.
1339 *
1340 * Otherwise, it will pass the newly allocated @new_p64 argument.
1341 */
1342 if (compatible_arg)
1343 err = native_ioctl(file, cmd, (unsigned long)p32);
1344 else
1345 err = native_ioctl(file, cmd, (unsigned long)new_p64);
1346
1347 if (err == -ENOTTY)
1348 return err;
1349
1350 /*
1351 * 4. Special case: even after an error we need to put the
1352 * results back for some ioctls.
1353 *
1354 * In the case of EXT_CTRLS, the error_idx will contain information
1355 * on which control failed.
1356 *
1357 * In the case of S_EDID, the driver can return E2BIG and set
1358 * the blocks to maximum allowed value.
1359 */
1360 switch (cmd) {
1361 case VIDIOC_G_EXT_CTRLS:
1362 case VIDIOC_S_EXT_CTRLS:
1363 case VIDIOC_TRY_EXT_CTRLS:
1364 if (put_v4l2_ext_controls32(file, new_p64, p32))
1365 err = -EFAULT;
1366 break;
1367 case VIDIOC_S_EDID:
1368 if (put_v4l2_edid32(new_p64, p32))
1369 err = -EFAULT;
1370 break;
1371 }
1372 if (err)
1373 return err;
1374
1375 /*
1376 * 5. Copy the data returned at the 64 bits userspace pointer to
1377 * the original 32 bits structure.
1378 */
1379 switch (cmd) {
1380 case VIDIOC_S_INPUT:
1381 case VIDIOC_S_OUTPUT:
1382 case VIDIOC_G_INPUT:
1383 case VIDIOC_G_OUTPUT:
1384 if (assign_in_user((compat_uint_t __user *)p32,
1385 ((unsigned int __user *)new_p64)))
1386 err = -EFAULT;
1387 break;
1388
1389 case VIDIOC_G_FBUF:
1390 err = put_v4l2_framebuffer32(new_p64, p32);
1391 break;
1392
1393 case VIDIOC_DQEVENT:
1394 err = put_v4l2_event32(new_p64, p32);
1395 break;
1396
1397 case VIDIOC_G_EDID:
1398 err = put_v4l2_edid32(new_p64, p32);
1399 break;
1400
1401 case VIDIOC_G_FMT:
1402 case VIDIOC_S_FMT:
1403 case VIDIOC_TRY_FMT:
1404 err = put_v4l2_format32(new_p64, p32);
1405 break;
1406
1407 case VIDIOC_CREATE_BUFS:
1408 err = put_v4l2_create32(new_p64, p32);
1409 break;
1410
1411 case VIDIOC_PREPARE_BUF:
1412 case VIDIOC_QUERYBUF:
1413 case VIDIOC_QBUF:
1414 case VIDIOC_DQBUF:
1415 err = put_v4l2_buffer32(new_p64, p32);
1416 break;
1417
1418 case VIDIOC_ENUMSTD:
1419 err = put_v4l2_standard32(new_p64, p32);
1420 break;
1421
1422 case VIDIOC_ENUMINPUT:
1423 err = put_v4l2_input32(new_p64, p32);
1424 break;
1425 }
1426 return err;
1427 }
1428
1429 /**
1430 * v4l2_compat_ioctl32() - Handles a compat32 ioctl call
1431 *
1432 * @file: pointer to &struct file with the file handler
1433 * @cmd: ioctl to be called
1434 * @arg: arguments passed from/to the ioctl handler
1435 *
1436 * This function is meant to be used as .compat_ioctl fops at v4l2-dev.c
1437 * in order to deal with 32-bit calls on a 64-bits Kernel.
1438 *
1439 * This function calls do_video_ioctl() for non-private V4L2 ioctls.
1440 * If the function is a private one it calls vdev->fops->compat_ioctl32
1441 * instead.
1442 */
1443 long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)
1444 {
1445 struct video_device *vdev = video_devdata(file);
1446 long ret = -ENOIOCTLCMD;
1447
1448 if (!file->f_op->unlocked_ioctl)
1449 return ret;
1450
1451 if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
1452 ret = do_video_ioctl(file, cmd, arg);
1453 else if (vdev->fops->compat_ioctl32)
1454 ret = vdev->fops->compat_ioctl32(file, cmd, arg);
1455
1456 if (ret == -ENOIOCTLCMD)
1457 pr_debug("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)\n",
1458 _IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd);
1459 return ret;
1460 }
1461 EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32);
Linux with added FPC-III support