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Merge tag 'extcon-next-for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-compat-ioctl32.c
blobe1eaf1135c7f88d3a09a7b7d26dd027b50e4cbc5
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ioctl32.c: Conversion between 32bit and 64bit native ioctls.
4 * Separated from fs stuff by Arnd Bergmann <arnd@arndb.de>
5 *
6 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
7 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
9 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
10 * Copyright (C) 2005 Philippe De Muyter (phdm@macqel.be)
11 * Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
12 *
13 * These routines maintain argument size conversion between 32bit and 64bit
14 * ioctls.
15 */
16
17 #include <linux/compat.h>
18 #include <linux/module.h>
19 #include <linux/videodev2.h>
20 #include <linux/v4l2-subdev.h>
21 #include <media/v4l2-dev.h>
22 #include <media/v4l2-fh.h>
23 #include <media/v4l2-ctrls.h>
24 #include <media/v4l2-ioctl.h>
25
26 /**
27 * assign_in_user() - Copy from one __user var to another one
28 *
29 * @to: __user var where data will be stored
30 * @from: __user var where data will be retrieved.
31 *
32 * As this code very often needs to allocate userspace memory, it is easier
33 * to have a macro that will do both get_user() and put_user() at once.
34 *
35 * This function complements the macros defined at asm-generic/uaccess.h.
36 * It uses the same argument order as copy_in_user()
37 */
38 #define assign_in_user(to, from) \
39 ({ \
40 typeof(*from) __assign_tmp; \
41 \
42 get_user(__assign_tmp, from) || put_user(__assign_tmp, to); \
43 })
44
45 /**
46 * get_user_cast() - Stores at a kernelspace local var the contents from a
47 * pointer with userspace data that is not tagged with __user.
48 *
49 * @__x: var where data will be stored
50 * @__ptr: var where data will be retrieved.
51 *
52 * Sometimes we need to declare a pointer without __user because it
53 * comes from a pointer struct field that will be retrieved from userspace
54 * by the 64-bit native ioctl handler. This function ensures that the
55 * @__ptr will be cast to __user before calling get_user() in order to
56 * avoid warnings with static code analyzers like smatch.
57 */
58 #define get_user_cast(__x, __ptr) \
59 ({ \
60 get_user(__x, (typeof(*__ptr) __user *)(__ptr)); \
61 })
62
63 /**
64 * put_user_force() - Stores the contents of a kernelspace local var
65 * into a userspace pointer, removing any __user cast.
66 *
67 * @__x: var where data will be stored
68 * @__ptr: var where data will be retrieved.
69 *
70 * Sometimes we need to remove the __user attribute from some data,
71 * by passing the __force macro. This function ensures that the
72 * @__ptr will be cast with __force before calling put_user(), in order to
73 * avoid warnings with static code analyzers like smatch.
74 */
75 #define put_user_force(__x, __ptr) \
76 ({ \
77 put_user((typeof(*__x) __force *)(__x), __ptr); \
78 })
79
80 /**
81 * assign_in_user_cast() - Copy from one __user var to another one
82 *
83 * @to: __user var where data will be stored
84 * @from: var where data will be retrieved that needs to be cast to __user.
85 *
86 * As this code very often needs to allocate userspace memory, it is easier
87 * to have a macro that will do both get_user_cast() and put_user() at once.
88 *
89 * This function should be used instead of assign_in_user() when the @from
90 * variable was not declared as __user. See get_user_cast() for more details.
91 *
92 * This function complements the macros defined at asm-generic/uaccess.h.
93 * It uses the same argument order as copy_in_user()
94 */
95 #define assign_in_user_cast(to, from) \
96 ({ \
97 typeof(*from) __assign_tmp; \
98 \
99 get_user_cast(__assign_tmp, from) || put_user(__assign_tmp, to);\
100 })
101
102 /**
103 * native_ioctl - Ancillary function that calls the native 64 bits ioctl
104 * handler.
105 *
106 * @file: pointer to &struct file with the file handler
107 * @cmd: ioctl to be called
108 * @arg: arguments passed from/to the ioctl handler
109 *
110 * This function calls the native ioctl handler at v4l2-dev, e. g. v4l2_ioctl()
111 */
112 static long native_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
113 {
114 long ret = -ENOIOCTLCMD;
115
116 if (file->f_op->unlocked_ioctl)
117 ret = file->f_op->unlocked_ioctl(file, cmd, arg);
118
119 return ret;
120 }
121
122
123 /*
124 * Per-ioctl data copy handlers.
125 *
126 * Those come in pairs, with a get_v4l2_foo() and a put_v4l2_foo() routine,
127 * where "v4l2_foo" is the name of the V4L2 struct.
128 *
129 * They basically get two __user pointers, one with a 32-bits struct that
130 * came from the userspace call and a 64-bits struct, also allocated as
131 * userspace, but filled internally by do_video_ioctl().
132 *
133 * For ioctls that have pointers inside it, the functions will also
134 * receive an ancillary buffer with extra space, used to pass extra
135 * data to the routine.
136 */
137
138 struct v4l2_clip32 {
139 struct v4l2_rect c;
140 compat_caddr_t next;
141 };
142
143 struct v4l2_window32 {
144 struct v4l2_rect w;
145 __u32 field; /* enum v4l2_field */
146 __u32 chromakey;
147 compat_caddr_t clips; /* actually struct v4l2_clip32 * */
148 __u32 clipcount;
149 compat_caddr_t bitmap;
150 __u8 global_alpha;
151 };
152
153 static int get_v4l2_window32(struct v4l2_window __user *p64,
154 struct v4l2_window32 __user *p32,
155 void __user *aux_buf, u32 aux_space)
156 {
157 struct v4l2_clip32 __user *uclips;
158 struct v4l2_clip __user *kclips;
159 compat_caddr_t p;
160 u32 clipcount;
161
162 if (!access_ok(p32, sizeof(*p32)) ||
163 copy_in_user(&p64->w, &p32->w, sizeof(p32->w)) ||
164 assign_in_user(&p64->field, &p32->field) ||
165 assign_in_user(&p64->chromakey, &p32->chromakey) ||
166 assign_in_user(&p64->global_alpha, &p32->global_alpha) ||
167 get_user(clipcount, &p32->clipcount) ||
168 put_user(clipcount, &p64->clipcount))
169 return -EFAULT;
170 if (clipcount > 2048)
171 return -EINVAL;
172 if (!clipcount)
173 return put_user(NULL, &p64->clips);
174
175 if (get_user(p, &p32->clips))
176 return -EFAULT;
177 uclips = compat_ptr(p);
178 if (aux_space < clipcount * sizeof(*kclips))
179 return -EFAULT;
180 kclips = aux_buf;
181 if (put_user(kclips, &p64->clips))
182 return -EFAULT;
183
184 while (clipcount--) {
185 if (copy_in_user(&kclips->c, &uclips->c, sizeof(uclips->c)))
186 return -EFAULT;
187 if (put_user(clipcount ? kclips + 1 : NULL, &kclips->next))
188 return -EFAULT;
189 uclips++;
190 kclips++;
191 }
192 return 0;
193 }
194
195 static int put_v4l2_window32(struct v4l2_window __user *p64,
196 struct v4l2_window32 __user *p32)
197 {
198 struct v4l2_clip __user *kclips;
199 struct v4l2_clip32 __user *uclips;
200 compat_caddr_t p;
201 u32 clipcount;
202
203 if (copy_in_user(&p32->w, &p64->w, sizeof(p64->w)) ||
204 assign_in_user(&p32->field, &p64->field) ||
205 assign_in_user(&p32->chromakey, &p64->chromakey) ||
206 assign_in_user(&p32->global_alpha, &p64->global_alpha) ||
207 get_user(clipcount, &p64->clipcount) ||
208 put_user(clipcount, &p32->clipcount))
209 return -EFAULT;
210 if (!clipcount)
211 return 0;
212
213 if (get_user(kclips, &p64->clips))
214 return -EFAULT;
215 if (get_user(p, &p32->clips))
216 return -EFAULT;
217 uclips = compat_ptr(p);
218 while (clipcount--) {
219 if (copy_in_user(&uclips->c, &kclips->c, sizeof(uclips->c)))
220 return -EFAULT;
221 uclips++;
222 kclips++;
223 }
224 return 0;
225 }
226
227 struct v4l2_format32 {
228 __u32 type; /* enum v4l2_buf_type */
229 union {
230 struct v4l2_pix_format pix;
231 struct v4l2_pix_format_mplane pix_mp;
232 struct v4l2_window32 win;
233 struct v4l2_vbi_format vbi;
234 struct v4l2_sliced_vbi_format sliced;
235 struct v4l2_sdr_format sdr;
236 struct v4l2_meta_format meta;
237 __u8 raw_data[200]; /* user-defined */
238 } fmt;
239 };
240
241 /**
242 * struct v4l2_create_buffers32 - VIDIOC_CREATE_BUFS32 argument
243 * @index: on return, index of the first created buffer
244 * @count: entry: number of requested buffers,
245 * return: number of created buffers
246 * @memory: buffer memory type
247 * @format: frame format, for which buffers are requested
248 * @capabilities: capabilities of this buffer type.
249 * @reserved: future extensions
250 */
251 struct v4l2_create_buffers32 {
252 __u32 index;
253 __u32 count;
254 __u32 memory; /* enum v4l2_memory */
255 struct v4l2_format32 format;
256 __u32 capabilities;
257 __u32 reserved[7];
258 };
259
260 static int __bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size)
261 {
262 u32 type;
263
264 if (get_user(type, &p32->type))
265 return -EFAULT;
266
267 switch (type) {
268 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
269 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: {
270 u32 clipcount;
271
272 if (get_user(clipcount, &p32->fmt.win.clipcount))
273 return -EFAULT;
274 if (clipcount > 2048)
275 return -EINVAL;
276 *size = clipcount * sizeof(struct v4l2_clip);
277 return 0;
278 }
279 default:
280 *size = 0;
281 return 0;
282 }
283 }
284
285 static int bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size)
286 {
287 if (!access_ok(p32, sizeof(*p32)))
288 return -EFAULT;
289 return __bufsize_v4l2_format(p32, size);
290 }
291
292 static int __get_v4l2_format32(struct v4l2_format __user *p64,
293 struct v4l2_format32 __user *p32,
294 void __user *aux_buf, u32 aux_space)
295 {
296 u32 type;
297
298 if (get_user(type, &p32->type) || put_user(type, &p64->type))
299 return -EFAULT;
300
301 switch (type) {
302 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
303 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
304 return copy_in_user(&p64->fmt.pix, &p32->fmt.pix,
305 sizeof(p64->fmt.pix)) ? -EFAULT : 0;
306 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
307 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
308 return copy_in_user(&p64->fmt.pix_mp, &p32->fmt.pix_mp,
309 sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0;
310 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
311 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
312 return get_v4l2_window32(&p64->fmt.win, &p32->fmt.win,
313 aux_buf, aux_space);
314 case V4L2_BUF_TYPE_VBI_CAPTURE:
315 case V4L2_BUF_TYPE_VBI_OUTPUT:
316 return copy_in_user(&p64->fmt.vbi, &p32->fmt.vbi,
317 sizeof(p64->fmt.vbi)) ? -EFAULT : 0;
318 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
319 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
320 return copy_in_user(&p64->fmt.sliced, &p32->fmt.sliced,
321 sizeof(p64->fmt.sliced)) ? -EFAULT : 0;
322 case V4L2_BUF_TYPE_SDR_CAPTURE:
323 case V4L2_BUF_TYPE_SDR_OUTPUT:
324 return copy_in_user(&p64->fmt.sdr, &p32->fmt.sdr,
325 sizeof(p64->fmt.sdr)) ? -EFAULT : 0;
326 case V4L2_BUF_TYPE_META_CAPTURE:
327 case V4L2_BUF_TYPE_META_OUTPUT:
328 return copy_in_user(&p64->fmt.meta, &p32->fmt.meta,
329 sizeof(p64->fmt.meta)) ? -EFAULT : 0;
330 default:
331 return -EINVAL;
332 }
333 }
334
335 static int get_v4l2_format32(struct v4l2_format __user *p64,
336 struct v4l2_format32 __user *p32,
337 void __user *aux_buf, u32 aux_space)
338 {
339 if (!access_ok(p32, sizeof(*p32)))
340 return -EFAULT;
341 return __get_v4l2_format32(p64, p32, aux_buf, aux_space);
342 }
343
344 static int bufsize_v4l2_create(struct v4l2_create_buffers32 __user *p32,
345 u32 *size)
346 {
347 if (!access_ok(p32, sizeof(*p32)))
348 return -EFAULT;
349 return __bufsize_v4l2_format(&p32->format, size);
350 }
351
352 static int get_v4l2_create32(struct v4l2_create_buffers __user *p64,
353 struct v4l2_create_buffers32 __user *p32,
354 void __user *aux_buf, u32 aux_space)
355 {
356 if (!access_ok(p32, sizeof(*p32)) ||
357 copy_in_user(p64, p32,
358 offsetof(struct v4l2_create_buffers32, format)))
359 return -EFAULT;
360 return __get_v4l2_format32(&p64->format, &p32->format,
361 aux_buf, aux_space);
362 }
363
364 static int __put_v4l2_format32(struct v4l2_format __user *p64,
365 struct v4l2_format32 __user *p32)
366 {
367 u32 type;
368
369 if (get_user(type, &p64->type))
370 return -EFAULT;
371
372 switch (type) {
373 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
374 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
375 return copy_in_user(&p32->fmt.pix, &p64->fmt.pix,
376 sizeof(p64->fmt.pix)) ? -EFAULT : 0;
377 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
378 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
379 return copy_in_user(&p32->fmt.pix_mp, &p64->fmt.pix_mp,
380 sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0;
381 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
382 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
383 return put_v4l2_window32(&p64->fmt.win, &p32->fmt.win);
384 case V4L2_BUF_TYPE_VBI_CAPTURE:
385 case V4L2_BUF_TYPE_VBI_OUTPUT:
386 return copy_in_user(&p32->fmt.vbi, &p64->fmt.vbi,
387 sizeof(p64->fmt.vbi)) ? -EFAULT : 0;
388 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
389 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
390 return copy_in_user(&p32->fmt.sliced, &p64->fmt.sliced,
391 sizeof(p64->fmt.sliced)) ? -EFAULT : 0;
392 case V4L2_BUF_TYPE_SDR_CAPTURE:
393 case V4L2_BUF_TYPE_SDR_OUTPUT:
394 return copy_in_user(&p32->fmt.sdr, &p64->fmt.sdr,
395 sizeof(p64->fmt.sdr)) ? -EFAULT : 0;
396 case V4L2_BUF_TYPE_META_CAPTURE:
397 case V4L2_BUF_TYPE_META_OUTPUT:
398 return copy_in_user(&p32->fmt.meta, &p64->fmt.meta,
399 sizeof(p64->fmt.meta)) ? -EFAULT : 0;
400 default:
401 return -EINVAL;
402 }
403 }
404
405 static int put_v4l2_format32(struct v4l2_format __user *p64,
406 struct v4l2_format32 __user *p32)
407 {
408 if (!access_ok(p32, sizeof(*p32)))
409 return -EFAULT;
410 return __put_v4l2_format32(p64, p32);
411 }
412
413 static int put_v4l2_create32(struct v4l2_create_buffers __user *p64,
414 struct v4l2_create_buffers32 __user *p32)
415 {
416 if (!access_ok(p32, sizeof(*p32)) ||
417 copy_in_user(p32, p64,
418 offsetof(struct v4l2_create_buffers32, format)) ||
419 assign_in_user(&p32->capabilities, &p64->capabilities) ||
420 copy_in_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
421 return -EFAULT;
422 return __put_v4l2_format32(&p64->format, &p32->format);
423 }
424
425 struct v4l2_standard32 {
426 __u32 index;
427 compat_u64 id;
428 __u8 name[24];
429 struct v4l2_fract frameperiod; /* Frames, not fields */
430 __u32 framelines;
431 __u32 reserved[4];
432 };
433
434 static int get_v4l2_standard32(struct v4l2_standard __user *p64,
435 struct v4l2_standard32 __user *p32)
436 {
437 /* other fields are not set by the user, nor used by the driver */
438 if (!access_ok(p32, sizeof(*p32)) ||
439 assign_in_user(&p64->index, &p32->index))
440 return -EFAULT;
441 return 0;
442 }
443
444 static int put_v4l2_standard32(struct v4l2_standard __user *p64,
445 struct v4l2_standard32 __user *p32)
446 {
447 if (!access_ok(p32, sizeof(*p32)) ||
448 assign_in_user(&p32->index, &p64->index) ||
449 assign_in_user(&p32->id, &p64->id) ||
450 copy_in_user(p32->name, p64->name, sizeof(p32->name)) ||
451 copy_in_user(&p32->frameperiod, &p64->frameperiod,
452 sizeof(p32->frameperiod)) ||
453 assign_in_user(&p32->framelines, &p64->framelines) ||
454 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
455 return -EFAULT;
456 return 0;
457 }
458
459 struct v4l2_plane32 {
460 __u32 bytesused;
461 __u32 length;
462 union {
463 __u32 mem_offset;
464 compat_long_t userptr;
465 __s32 fd;
466 } m;
467 __u32 data_offset;
468 __u32 reserved[11];
469 };
470
471 struct v4l2_buffer32 {
472 __u32 index;
473 __u32 type; /* enum v4l2_buf_type */
474 __u32 bytesused;
475 __u32 flags;
476 __u32 field; /* enum v4l2_field */
477 struct compat_timeval timestamp;
478 struct v4l2_timecode timecode;
479 __u32 sequence;
480
481 /* memory location */
482 __u32 memory; /* enum v4l2_memory */
483 union {
484 __u32 offset;
485 compat_long_t userptr;
486 compat_caddr_t planes;
487 __s32 fd;
488 } m;
489 __u32 length;
490 __u32 reserved2;
491 __s32 request_fd;
492 };
493
494 static int get_v4l2_plane32(struct v4l2_plane __user *p64,
495 struct v4l2_plane32 __user *p32,
496 enum v4l2_memory memory)
497 {
498 compat_ulong_t p;
499
500 if (copy_in_user(p64, p32, 2 * sizeof(__u32)) ||
501 copy_in_user(&p64->data_offset, &p32->data_offset,
502 sizeof(p64->data_offset)))
503 return -EFAULT;
504
505 switch (memory) {
506 case V4L2_MEMORY_MMAP:
507 case V4L2_MEMORY_OVERLAY:
508 if (copy_in_user(&p64->m.mem_offset, &p32->m.mem_offset,
509 sizeof(p32->m.mem_offset)))
510 return -EFAULT;
511 break;
512 case V4L2_MEMORY_USERPTR:
513 if (get_user(p, &p32->m.userptr) ||
514 put_user((unsigned long)compat_ptr(p), &p64->m.userptr))
515 return -EFAULT;
516 break;
517 case V4L2_MEMORY_DMABUF:
518 if (copy_in_user(&p64->m.fd, &p32->m.fd, sizeof(p32->m.fd)))
519 return -EFAULT;
520 break;
521 }
522
523 return 0;
524 }
525
526 static int put_v4l2_plane32(struct v4l2_plane __user *p64,
527 struct v4l2_plane32 __user *p32,
528 enum v4l2_memory memory)
529 {
530 unsigned long p;
531
532 if (copy_in_user(p32, p64, 2 * sizeof(__u32)) ||
533 copy_in_user(&p32->data_offset, &p64->data_offset,
534 sizeof(p64->data_offset)))
535 return -EFAULT;
536
537 switch (memory) {
538 case V4L2_MEMORY_MMAP:
539 case V4L2_MEMORY_OVERLAY:
540 if (copy_in_user(&p32->m.mem_offset, &p64->m.mem_offset,
541 sizeof(p64->m.mem_offset)))
542 return -EFAULT;
543 break;
544 case V4L2_MEMORY_USERPTR:
545 if (get_user(p, &p64->m.userptr) ||
546 put_user((compat_ulong_t)ptr_to_compat((void __user *)p),
547 &p32->m.userptr))
548 return -EFAULT;
549 break;
550 case V4L2_MEMORY_DMABUF:
551 if (copy_in_user(&p32->m.fd, &p64->m.fd, sizeof(p64->m.fd)))
552 return -EFAULT;
553 break;
554 }
555
556 return 0;
557 }
558
559 static int bufsize_v4l2_buffer(struct v4l2_buffer32 __user *p32, u32 *size)
560 {
561 u32 type;
562 u32 length;
563
564 if (!access_ok(p32, sizeof(*p32)) ||
565 get_user(type, &p32->type) ||
566 get_user(length, &p32->length))
567 return -EFAULT;
568
569 if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
570 if (length > VIDEO_MAX_PLANES)
571 return -EINVAL;
572
573 /*
574 * We don't really care if userspace decides to kill itself
575 * by passing a very big length value
576 */
577 *size = length * sizeof(struct v4l2_plane);
578 } else {
579 *size = 0;
580 }
581 return 0;
582 }
583
584 static int get_v4l2_buffer32(struct v4l2_buffer __user *p64,
585 struct v4l2_buffer32 __user *p32,
586 void __user *aux_buf, u32 aux_space)
587 {
588 u32 type;
589 u32 length;
590 s32 request_fd;
591 enum v4l2_memory memory;
592 struct v4l2_plane32 __user *uplane32;
593 struct v4l2_plane __user *uplane;
594 compat_caddr_t p;
595 int ret;
596
597 if (!access_ok(p32, sizeof(*p32)) ||
598 assign_in_user(&p64->index, &p32->index) ||
599 get_user(type, &p32->type) ||
600 put_user(type, &p64->type) ||
601 assign_in_user(&p64->flags, &p32->flags) ||
602 get_user(memory, &p32->memory) ||
603 put_user(memory, &p64->memory) ||
604 get_user(length, &p32->length) ||
605 put_user(length, &p64->length) ||
606 get_user(request_fd, &p32->request_fd) ||
607 put_user(request_fd, &p64->request_fd))
608 return -EFAULT;
609
610 if (V4L2_TYPE_IS_OUTPUT(type))
611 if (assign_in_user(&p64->bytesused, &p32->bytesused) ||
612 assign_in_user(&p64->field, &p32->field) ||
613 assign_in_user(&p64->timestamp.tv_sec,
614 &p32->timestamp.tv_sec) ||
615 assign_in_user(&p64->timestamp.tv_usec,
616 &p32->timestamp.tv_usec))
617 return -EFAULT;
618
619 if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
620 u32 num_planes = length;
621
622 if (num_planes == 0) {
623 /*
624 * num_planes == 0 is legal, e.g. when userspace doesn't
625 * need planes array on DQBUF
626 */
627 return put_user(NULL, &p64->m.planes);
628 }
629 if (num_planes > VIDEO_MAX_PLANES)
630 return -EINVAL;
631
632 if (get_user(p, &p32->m.planes))
633 return -EFAULT;
634
635 uplane32 = compat_ptr(p);
636 if (!access_ok(uplane32,
637 num_planes * sizeof(*uplane32)))
638 return -EFAULT;
639
640 /*
641 * We don't really care if userspace decides to kill itself
642 * by passing a very big num_planes value
643 */
644 if (aux_space < num_planes * sizeof(*uplane))
645 return -EFAULT;
646
647 uplane = aux_buf;
648 if (put_user_force(uplane, &p64->m.planes))
649 return -EFAULT;
650
651 while (num_planes--) {
652 ret = get_v4l2_plane32(uplane, uplane32, memory);
653 if (ret)
654 return ret;
655 uplane++;
656 uplane32++;
657 }
658 } else {
659 switch (memory) {
660 case V4L2_MEMORY_MMAP:
661 case V4L2_MEMORY_OVERLAY:
662 if (assign_in_user(&p64->m.offset, &p32->m.offset))
663 return -EFAULT;
664 break;
665 case V4L2_MEMORY_USERPTR: {
666 compat_ulong_t userptr;
667
668 if (get_user(userptr, &p32->m.userptr) ||
669 put_user((unsigned long)compat_ptr(userptr),
670 &p64->m.userptr))
671 return -EFAULT;
672 break;
673 }
674 case V4L2_MEMORY_DMABUF:
675 if (assign_in_user(&p64->m.fd, &p32->m.fd))
676 return -EFAULT;
677 break;
678 }
679 }
680
681 return 0;
682 }
683
684 static int put_v4l2_buffer32(struct v4l2_buffer __user *p64,
685 struct v4l2_buffer32 __user *p32)
686 {
687 u32 type;
688 u32 length;
689 enum v4l2_memory memory;
690 struct v4l2_plane32 __user *uplane32;
691 struct v4l2_plane *uplane;
692 compat_caddr_t p;
693 int ret;
694
695 if (!access_ok(p32, sizeof(*p32)) ||
696 assign_in_user(&p32->index, &p64->index) ||
697 get_user(type, &p64->type) ||
698 put_user(type, &p32->type) ||
699 assign_in_user(&p32->flags, &p64->flags) ||
700 get_user(memory, &p64->memory) ||
701 put_user(memory, &p32->memory))
702 return -EFAULT;
703
704 if (assign_in_user(&p32->bytesused, &p64->bytesused) ||
705 assign_in_user(&p32->field, &p64->field) ||
706 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) ||
707 assign_in_user(&p32->timestamp.tv_usec, &p64->timestamp.tv_usec) ||
708 copy_in_user(&p32->timecode, &p64->timecode, sizeof(p64->timecode)) ||
709 assign_in_user(&p32->sequence, &p64->sequence) ||
710 assign_in_user(&p32->reserved2, &p64->reserved2) ||
711 assign_in_user(&p32->request_fd, &p64->request_fd) ||
712 get_user(length, &p64->length) ||
713 put_user(length, &p32->length))
714 return -EFAULT;
715
716 if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
717 u32 num_planes = length;
718
719 if (num_planes == 0)
720 return 0;
721 /* We need to define uplane without __user, even though
722 * it does point to data in userspace here. The reason is
723 * that v4l2-ioctl.c copies it from userspace to kernelspace,
724 * so its definition in videodev2.h doesn't have a
725 * __user markup. Defining uplane with __user causes
726 * smatch warnings, so instead declare it without __user
727 * and cast it as a userspace pointer to put_v4l2_plane32().
728 */
729 if (get_user(uplane, &p64->m.planes))
730 return -EFAULT;
731 if (get_user(p, &p32->m.planes))
732 return -EFAULT;
733 uplane32 = compat_ptr(p);
734
735 while (num_planes--) {
736 ret = put_v4l2_plane32((void __user *)uplane,
737 uplane32, memory);
738 if (ret)
739 return ret;
740 ++uplane;
741 ++uplane32;
742 }
743 } else {
744 switch (memory) {
745 case V4L2_MEMORY_MMAP:
746 case V4L2_MEMORY_OVERLAY:
747 if (assign_in_user(&p32->m.offset, &p64->m.offset))
748 return -EFAULT;
749 break;
750 case V4L2_MEMORY_USERPTR:
751 if (assign_in_user(&p32->m.userptr, &p64->m.userptr))
752 return -EFAULT;
753 break;
754 case V4L2_MEMORY_DMABUF:
755 if (assign_in_user(&p32->m.fd, &p64->m.fd))
756 return -EFAULT;
757 break;
758 }
759 }
760
761 return 0;
762 }
763
764 struct v4l2_framebuffer32 {
765 __u32 capability;
766 __u32 flags;
767 compat_caddr_t base;
768 struct {
769 __u32 width;
770 __u32 height;
771 __u32 pixelformat;
772 __u32 field;
773 __u32 bytesperline;
774 __u32 sizeimage;
775 __u32 colorspace;
776 __u32 priv;
777 } fmt;
778 };
779
780 static int get_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64,
781 struct v4l2_framebuffer32 __user *p32)
782 {
783 compat_caddr_t tmp;
784
785 if (!access_ok(p32, sizeof(*p32)) ||
786 get_user(tmp, &p32->base) ||
787 put_user_force(compat_ptr(tmp), &p64->base) ||
788 assign_in_user(&p64->capability, &p32->capability) ||
789 assign_in_user(&p64->flags, &p32->flags) ||
790 copy_in_user(&p64->fmt, &p32->fmt, sizeof(p64->fmt)))
791 return -EFAULT;
792 return 0;
793 }
794
795 static int put_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64,
796 struct v4l2_framebuffer32 __user *p32)
797 {
798 void *base;
799
800 if (!access_ok(p32, sizeof(*p32)) ||
801 get_user(base, &p64->base) ||
802 put_user(ptr_to_compat((void __user *)base), &p32->base) ||
803 assign_in_user(&p32->capability, &p64->capability) ||
804 assign_in_user(&p32->flags, &p64->flags) ||
805 copy_in_user(&p32->fmt, &p64->fmt, sizeof(p64->fmt)))
806 return -EFAULT;
807 return 0;
808 }
809
810 struct v4l2_input32 {
811 __u32 index; /* Which input */
812 __u8 name[32]; /* Label */
813 __u32 type; /* Type of input */
814 __u32 audioset; /* Associated audios (bitfield) */
815 __u32 tuner; /* Associated tuner */
816 compat_u64 std;
817 __u32 status;
818 __u32 capabilities;
819 __u32 reserved[3];
820 };
821
822 /*
823 * The 64-bit v4l2_input struct has extra padding at the end of the struct.
824 * Otherwise it is identical to the 32-bit version.
825 */
826 static inline int get_v4l2_input32(struct v4l2_input __user *p64,
827 struct v4l2_input32 __user *p32)
828 {
829 if (copy_in_user(p64, p32, sizeof(*p32)))
830 return -EFAULT;
831 return 0;
832 }
833
834 static inline int put_v4l2_input32(struct v4l2_input __user *p64,
835 struct v4l2_input32 __user *p32)
836 {
837 if (copy_in_user(p32, p64, sizeof(*p32)))
838 return -EFAULT;
839 return 0;
840 }
841
842 struct v4l2_ext_controls32 {
843 __u32 which;
844 __u32 count;
845 __u32 error_idx;
846 __s32 request_fd;
847 __u32 reserved[1];
848 compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */
849 };
850
851 struct v4l2_ext_control32 {
852 __u32 id;
853 __u32 size;
854 __u32 reserved2[1];
855 union {
856 __s32 value;
857 __s64 value64;
858 compat_caddr_t string; /* actually char * */
859 };
860 } __attribute__ ((packed));
861
862 /* Return true if this control is a pointer type. */
863 static inline bool ctrl_is_pointer(struct file *file, u32 id)
864 {
865 struct video_device *vdev = video_devdata(file);
866 struct v4l2_fh *fh = NULL;
867 struct v4l2_ctrl_handler *hdl = NULL;
868 struct v4l2_query_ext_ctrl qec = { id };
869 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;
870
871 if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags))
872 fh = file->private_data;
873
874 if (fh && fh->ctrl_handler)
875 hdl = fh->ctrl_handler;
876 else if (vdev->ctrl_handler)
877 hdl = vdev->ctrl_handler;
878
879 if (hdl) {
880 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id);
881
882 return ctrl && ctrl->is_ptr;
883 }
884
885 if (!ops || !ops->vidioc_query_ext_ctrl)
886 return false;
887
888 return !ops->vidioc_query_ext_ctrl(file, fh, &qec) &&
889 (qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD);
890 }
891
892 static int bufsize_v4l2_ext_controls(struct v4l2_ext_controls32 __user *p32,
893 u32 *size)
894 {
895 u32 count;
896
897 if (!access_ok(p32, sizeof(*p32)) ||
898 get_user(count, &p32->count))
899 return -EFAULT;
900 if (count > V4L2_CID_MAX_CTRLS)
901 return -EINVAL;
902 *size = count * sizeof(struct v4l2_ext_control);
903 return 0;
904 }
905
906 static int get_v4l2_ext_controls32(struct file *file,
907 struct v4l2_ext_controls __user *p64,
908 struct v4l2_ext_controls32 __user *p32,
909 void __user *aux_buf, u32 aux_space)
910 {
911 struct v4l2_ext_control32 __user *ucontrols;
912 struct v4l2_ext_control __user *kcontrols;
913 u32 count;
914 u32 n;
915 compat_caddr_t p;
916
917 if (!access_ok(p32, sizeof(*p32)) ||
918 assign_in_user(&p64->which, &p32->which) ||
919 get_user(count, &p32->count) ||
920 put_user(count, &p64->count) ||
921 assign_in_user(&p64->error_idx, &p32->error_idx) ||
922 assign_in_user(&p64->request_fd, &p32->request_fd) ||
923 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved)))
924 return -EFAULT;
925
926 if (count == 0)
927 return put_user(NULL, &p64->controls);
928 if (count > V4L2_CID_MAX_CTRLS)
929 return -EINVAL;
930 if (get_user(p, &p32->controls))
931 return -EFAULT;
932 ucontrols = compat_ptr(p);
933 if (!access_ok(ucontrols, count * sizeof(*ucontrols)))
934 return -EFAULT;
935 if (aux_space < count * sizeof(*kcontrols))
936 return -EFAULT;
937 kcontrols = aux_buf;
938 if (put_user_force(kcontrols, &p64->controls))
939 return -EFAULT;
940
941 for (n = 0; n < count; n++) {
942 u32 id;
943
944 if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols)))
945 return -EFAULT;
946
947 if (get_user(id, &kcontrols->id))
948 return -EFAULT;
949
950 if (ctrl_is_pointer(file, id)) {
951 void __user *s;
952
953 if (get_user(p, &ucontrols->string))
954 return -EFAULT;
955 s = compat_ptr(p);
956 if (put_user(s, &kcontrols->string))
957 return -EFAULT;
958 }
959 ucontrols++;
960 kcontrols++;
961 }
962 return 0;
963 }
964
965 static int put_v4l2_ext_controls32(struct file *file,
966 struct v4l2_ext_controls __user *p64,
967 struct v4l2_ext_controls32 __user *p32)
968 {
969 struct v4l2_ext_control32 __user *ucontrols;
970 struct v4l2_ext_control *kcontrols;
971 u32 count;
972 u32 n;
973 compat_caddr_t p;
974
975 /*
976 * We need to define kcontrols without __user, even though it does
977 * point to data in userspace here. The reason is that v4l2-ioctl.c
978 * copies it from userspace to kernelspace, so its definition in
979 * videodev2.h doesn't have a __user markup. Defining kcontrols
980 * with __user causes smatch warnings, so instead declare it
981 * without __user and cast it as a userspace pointer where needed.
982 */
983 if (!access_ok(p32, sizeof(*p32)) ||
984 assign_in_user(&p32->which, &p64->which) ||
985 get_user(count, &p64->count) ||
986 put_user(count, &p32->count) ||
987 assign_in_user(&p32->error_idx, &p64->error_idx) ||
988 assign_in_user(&p32->request_fd, &p64->request_fd) ||
989 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)) ||
990 get_user(kcontrols, &p64->controls))
991 return -EFAULT;
992
993 if (!count || count > (U32_MAX/sizeof(*ucontrols)))
994 return 0;
995 if (get_user(p, &p32->controls))
996 return -EFAULT;
997 ucontrols = compat_ptr(p);
998 if (!access_ok(ucontrols, count * sizeof(*ucontrols)))
999 return -EFAULT;
1000
1001 for (n = 0; n < count; n++) {
1002 unsigned int size = sizeof(*ucontrols);
1003 u32 id;
1004
1005 if (get_user_cast(id, &kcontrols->id) ||
1006 put_user(id, &ucontrols->id) ||
1007 assign_in_user_cast(&ucontrols->size, &kcontrols->size) ||
1008 copy_in_user(&ucontrols->reserved2,
1009 (void __user *)&kcontrols->reserved2,
1010 sizeof(ucontrols->reserved2)))
1011 return -EFAULT;
1012
1013 /*
1014 * Do not modify the pointer when copying a pointer control.
1015 * The contents of the pointer was changed, not the pointer
1016 * itself.
1017 */
1018 if (ctrl_is_pointer(file, id))
1019 size -= sizeof(ucontrols->value64);
1020
1021 if (copy_in_user(ucontrols,
1022 (void __user *)kcontrols, size))
1023 return -EFAULT;
1024
1025 ucontrols++;
1026 kcontrols++;
1027 }
1028 return 0;
1029 }
1030
1031 struct v4l2_event32 {
1032 __u32 type;
1033 union {
1034 compat_s64 value64;
1035 __u8 data[64];
1036 } u;
1037 __u32 pending;
1038 __u32 sequence;
1039 struct compat_timespec timestamp;
1040 __u32 id;
1041 __u32 reserved[8];
1042 };
1043
1044 static int put_v4l2_event32(struct v4l2_event __user *p64,
1045 struct v4l2_event32 __user *p32)
1046 {
1047 if (!access_ok(p32, sizeof(*p32)) ||
1048 assign_in_user(&p32->type, &p64->type) ||
1049 copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) ||
1050 assign_in_user(&p32->pending, &p64->pending) ||
1051 assign_in_user(&p32->sequence, &p64->sequence) ||
1052 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) ||
1053 assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) ||
1054 assign_in_user(&p32->id, &p64->id) ||
1055 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
1056 return -EFAULT;
1057 return 0;
1058 }
1059
1060 struct v4l2_edid32 {
1061 __u32 pad;
1062 __u32 start_block;
1063 __u32 blocks;
1064 __u32 reserved[5];
1065 compat_caddr_t edid;
1066 };
1067
1068 static int get_v4l2_edid32(struct v4l2_edid __user *p64,
1069 struct v4l2_edid32 __user *p32)
1070 {
1071 compat_uptr_t tmp;
1072
1073 if (!access_ok(p32, sizeof(*p32)) ||
1074 assign_in_user(&p64->pad, &p32->pad) ||
1075 assign_in_user(&p64->start_block, &p32->start_block) ||
1076 assign_in_user_cast(&p64->blocks, &p32->blocks) ||
1077 get_user(tmp, &p32->edid) ||
1078 put_user_force(compat_ptr(tmp), &p64->edid) ||
1079 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved)))
1080 return -EFAULT;
1081 return 0;
1082 }
1083
1084 static int put_v4l2_edid32(struct v4l2_edid __user *p64,
1085 struct v4l2_edid32 __user *p32)
1086 {
1087 void *edid;
1088
1089 if (!access_ok(p32, sizeof(*p32)) ||
1090 assign_in_user(&p32->pad, &p64->pad) ||
1091 assign_in_user(&p32->start_block, &p64->start_block) ||
1092 assign_in_user(&p32->blocks, &p64->blocks) ||
1093 get_user(edid, &p64->edid) ||
1094 put_user(ptr_to_compat((void __user *)edid), &p32->edid) ||
1095 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
1096 return -EFAULT;
1097 return 0;
1098 }
1099
1100 /*
1101 * List of ioctls that require 32-bits/64-bits conversion
1102 *
1103 * The V4L2 ioctls that aren't listed there don't have pointer arguments
1104 * and the struct size is identical for both 32 and 64 bits versions, so
1105 * they don't need translations.
1106 */
1107
1108 #define VIDIOC_G_FMT32 _IOWR('V', 4, struct v4l2_format32)
1109 #define VIDIOC_S_FMT32 _IOWR('V', 5, struct v4l2_format32)
1110 #define VIDIOC_QUERYBUF32 _IOWR('V', 9, struct v4l2_buffer32)
1111 #define VIDIOC_G_FBUF32 _IOR ('V', 10, struct v4l2_framebuffer32)
1112 #define VIDIOC_S_FBUF32 _IOW ('V', 11, struct v4l2_framebuffer32)
1113 #define VIDIOC_QBUF32 _IOWR('V', 15, struct v4l2_buffer32)
1114 #define VIDIOC_DQBUF32 _IOWR('V', 17, struct v4l2_buffer32)
1115 #define VIDIOC_ENUMSTD32 _IOWR('V', 25, struct v4l2_standard32)
1116 #define VIDIOC_ENUMINPUT32 _IOWR('V', 26, struct v4l2_input32)
1117 #define VIDIOC_G_EDID32 _IOWR('V', 40, struct v4l2_edid32)
1118 #define VIDIOC_S_EDID32 _IOWR('V', 41, struct v4l2_edid32)
1119 #define VIDIOC_TRY_FMT32 _IOWR('V', 64, struct v4l2_format32)
1120 #define VIDIOC_G_EXT_CTRLS32 _IOWR('V', 71, struct v4l2_ext_controls32)
1121 #define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32)
1122 #define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32)
1123 #define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32)
1124 #define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32)
1125 #define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32)
1126
1127 #define VIDIOC_OVERLAY32 _IOW ('V', 14, s32)
1128 #define VIDIOC_STREAMON32 _IOW ('V', 18, s32)
1129 #define VIDIOC_STREAMOFF32 _IOW ('V', 19, s32)
1130 #define VIDIOC_G_INPUT32 _IOR ('V', 38, s32)
1131 #define VIDIOC_S_INPUT32 _IOWR('V', 39, s32)
1132 #define VIDIOC_G_OUTPUT32 _IOR ('V', 46, s32)
1133 #define VIDIOC_S_OUTPUT32 _IOWR('V', 47, s32)
1134
1135 /**
1136 * alloc_userspace() - Allocates a 64-bits userspace pointer compatible
1137 * for calling the native 64-bits version of an ioctl.
1138 *
1139 * @size: size of the structure itself to be allocated.
1140 * @aux_space: extra size needed to store "extra" data, e.g. space for
1141 * other __user data that is pointed to fields inside the
1142 * structure.
1143 * @new_p64: pointer to a pointer to be filled with the allocated struct.
1144 *
1145 * Return:
1146 *
1147 * if it can't allocate memory, either -ENOMEM or -EFAULT will be returned.
1148 * Zero otherwise.
1149 */
1150 static int alloc_userspace(unsigned int size, u32 aux_space,
1151 void __user **new_p64)
1152 {
1153 *new_p64 = compat_alloc_user_space(size + aux_space);
1154 if (!*new_p64)
1155 return -ENOMEM;
1156 if (clear_user(*new_p64, size))
1157 return -EFAULT;
1158 return 0;
1159 }
1160
1161 /**
1162 * do_video_ioctl() - Ancillary function with handles a compat32 ioctl call
1163 *
1164 * @file: pointer to &struct file with the file handler
1165 * @cmd: ioctl to be called
1166 * @arg: arguments passed from/to the ioctl handler
1167 *
1168 * This function is called when a 32 bits application calls a V4L2 ioctl
1169 * and the Kernel is compiled with 64 bits.
1170 *
1171 * This function is called by v4l2_compat_ioctl32() when the function is
1172 * not private to some specific driver.
1173 *
1174 * It converts a 32-bits struct into a 64 bits one, calls the native 64-bits
1175 * ioctl handler and fills back the 32-bits struct with the results of the
1176 * native call.
1177 */
1178 static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1179 {
1180 void __user *p32 = compat_ptr(arg);
1181 void __user *new_p64 = NULL;
1182 void __user *aux_buf;
1183 u32 aux_space;
1184 int compatible_arg = 1;
1185 long err = 0;
1186
1187 /*
1188 * 1. When struct size is different, converts the command.
1189 */
1190 switch (cmd) {
1191 case VIDIOC_G_FMT32: cmd = VIDIOC_G_FMT; break;
1192 case VIDIOC_S_FMT32: cmd = VIDIOC_S_FMT; break;
1193 case VIDIOC_QUERYBUF32: cmd = VIDIOC_QUERYBUF; break;
1194 case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break;
1195 case VIDIOC_S_FBUF32: cmd = VIDIOC_S_FBUF; break;
1196 case VIDIOC_QBUF32: cmd = VIDIOC_QBUF; break;
1197 case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break;
1198 case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break;
1199 case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break;
1200 case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break;
1201 case VIDIOC_G_EXT_CTRLS32: cmd = VIDIOC_G_EXT_CTRLS; break;
1202 case VIDIOC_S_EXT_CTRLS32: cmd = VIDIOC_S_EXT_CTRLS; break;
1203 case VIDIOC_TRY_EXT_CTRLS32: cmd = VIDIOC_TRY_EXT_CTRLS; break;
1204 case VIDIOC_DQEVENT32: cmd = VIDIOC_DQEVENT; break;
1205 case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break;
1206 case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break;
1207 case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break;
1208 case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break;
1209 case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break;
1210 case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break;
1211 case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break;
1212 case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break;
1213 case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break;
1214 case VIDIOC_G_EDID32: cmd = VIDIOC_G_EDID; break;
1215 case VIDIOC_S_EDID32: cmd = VIDIOC_S_EDID; break;
1216 }
1217
1218 /*
1219 * 2. Allocates a 64-bits userspace pointer to store the
1220 * values of the ioctl and copy data from the 32-bits __user
1221 * argument into it.
1222 */
1223 switch (cmd) {
1224 case VIDIOC_OVERLAY:
1225 case VIDIOC_STREAMON:
1226 case VIDIOC_STREAMOFF:
1227 case VIDIOC_S_INPUT:
1228 case VIDIOC_S_OUTPUT:
1229 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64);
1230 if (!err && assign_in_user((unsigned int __user *)new_p64,
1231 (compat_uint_t __user *)p32))
1232 err = -EFAULT;
1233 compatible_arg = 0;
1234 break;
1235
1236 case VIDIOC_G_INPUT:
1237 case VIDIOC_G_OUTPUT:
1238 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64);
1239 compatible_arg = 0;
1240 break;
1241
1242 case VIDIOC_G_EDID:
1243 case VIDIOC_S_EDID:
1244 err = alloc_userspace(sizeof(struct v4l2_edid), 0, &new_p64);
1245 if (!err)
1246 err = get_v4l2_edid32(new_p64, p32);
1247 compatible_arg = 0;
1248 break;
1249
1250 case VIDIOC_G_FMT:
1251 case VIDIOC_S_FMT:
1252 case VIDIOC_TRY_FMT:
1253 err = bufsize_v4l2_format(p32, &aux_space);
1254 if (!err)
1255 err = alloc_userspace(sizeof(struct v4l2_format),
1256 aux_space, &new_p64);
1257 if (!err) {
1258 aux_buf = new_p64 + sizeof(struct v4l2_format);
1259 err = get_v4l2_format32(new_p64, p32,
1260 aux_buf, aux_space);
1261 }
1262 compatible_arg = 0;
1263 break;
1264
1265 case VIDIOC_CREATE_BUFS:
1266 err = bufsize_v4l2_create(p32, &aux_space);
1267 if (!err)
1268 err = alloc_userspace(sizeof(struct v4l2_create_buffers),
1269 aux_space, &new_p64);
1270 if (!err) {
1271 aux_buf = new_p64 + sizeof(struct v4l2_create_buffers);
1272 err = get_v4l2_create32(new_p64, p32,
1273 aux_buf, aux_space);
1274 }
1275 compatible_arg = 0;
1276 break;
1277
1278 case VIDIOC_PREPARE_BUF:
1279 case VIDIOC_QUERYBUF:
1280 case VIDIOC_QBUF:
1281 case VIDIOC_DQBUF:
1282 err = bufsize_v4l2_buffer(p32, &aux_space);
1283 if (!err)
1284 err = alloc_userspace(sizeof(struct v4l2_buffer),
1285 aux_space, &new_p64);
1286 if (!err) {
1287 aux_buf = new_p64 + sizeof(struct v4l2_buffer);
1288 err = get_v4l2_buffer32(new_p64, p32,
1289 aux_buf, aux_space);
1290 }
1291 compatible_arg = 0;
1292 break;
1293
1294 case VIDIOC_S_FBUF:
1295 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0,
1296 &new_p64);
1297 if (!err)
1298 err = get_v4l2_framebuffer32(new_p64, p32);
1299 compatible_arg = 0;
1300 break;
1301
1302 case VIDIOC_G_FBUF:
1303 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0,
1304 &new_p64);
1305 compatible_arg = 0;
1306 break;
1307
1308 case VIDIOC_ENUMSTD:
1309 err = alloc_userspace(sizeof(struct v4l2_standard), 0,
1310 &new_p64);
1311 if (!err)
1312 err = get_v4l2_standard32(new_p64, p32);
1313 compatible_arg = 0;
1314 break;
1315
1316 case VIDIOC_ENUMINPUT:
1317 err = alloc_userspace(sizeof(struct v4l2_input), 0, &new_p64);
1318 if (!err)
1319 err = get_v4l2_input32(new_p64, p32);
1320 compatible_arg = 0;
1321 break;
1322
1323 case VIDIOC_G_EXT_CTRLS:
1324 case VIDIOC_S_EXT_CTRLS:
1325 case VIDIOC_TRY_EXT_CTRLS:
1326 err = bufsize_v4l2_ext_controls(p32, &aux_space);
1327 if (!err)
1328 err = alloc_userspace(sizeof(struct v4l2_ext_controls),
1329 aux_space, &new_p64);
1330 if (!err) {
1331 aux_buf = new_p64 + sizeof(struct v4l2_ext_controls);
1332 err = get_v4l2_ext_controls32(file, new_p64, p32,
1333 aux_buf, aux_space);
1334 }
1335 compatible_arg = 0;
1336 break;
1337 case VIDIOC_DQEVENT:
1338 err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64);
1339 compatible_arg = 0;
1340 break;
1341 }
1342 if (err)
1343 return err;
1344
1345 /*
1346 * 3. Calls the native 64-bits ioctl handler.
1347 *
1348 * For the functions where a conversion was not needed,
1349 * compatible_arg is true, and it will call it with the arguments
1350 * provided by userspace and stored at @p32 var.
1351 *
1352 * Otherwise, it will pass the newly allocated @new_p64 argument.
1353 */
1354 if (compatible_arg)
1355 err = native_ioctl(file, cmd, (unsigned long)p32);
1356 else
1357 err = native_ioctl(file, cmd, (unsigned long)new_p64);
1358
1359 if (err == -ENOTTY)
1360 return err;
1361
1362 /*
1363 * 4. Special case: even after an error we need to put the
1364 * results back for some ioctls.
1365 *
1366 * In the case of EXT_CTRLS, the error_idx will contain information
1367 * on which control failed.
1368 *
1369 * In the case of S_EDID, the driver can return E2BIG and set
1370 * the blocks to maximum allowed value.
1371 */
1372 switch (cmd) {
1373 case VIDIOC_G_EXT_CTRLS:
1374 case VIDIOC_S_EXT_CTRLS:
1375 case VIDIOC_TRY_EXT_CTRLS:
1376 if (put_v4l2_ext_controls32(file, new_p64, p32))
1377 err = -EFAULT;
1378 break;
1379 case VIDIOC_S_EDID:
1380 if (put_v4l2_edid32(new_p64, p32))
1381 err = -EFAULT;
1382 break;
1383 }
1384 if (err)
1385 return err;
1386
1387 /*
1388 * 5. Copy the data returned at the 64 bits userspace pointer to
1389 * the original 32 bits structure.
1390 */
1391 switch (cmd) {
1392 case VIDIOC_S_INPUT:
1393 case VIDIOC_S_OUTPUT:
1394 case VIDIOC_G_INPUT:
1395 case VIDIOC_G_OUTPUT:
1396 if (assign_in_user((compat_uint_t __user *)p32,
1397 ((unsigned int __user *)new_p64)))
1398 err = -EFAULT;
1399 break;
1400
1401 case VIDIOC_G_FBUF:
1402 err = put_v4l2_framebuffer32(new_p64, p32);
1403 break;
1404
1405 case VIDIOC_DQEVENT:
1406 err = put_v4l2_event32(new_p64, p32);
1407 break;
1408
1409 case VIDIOC_G_EDID:
1410 err = put_v4l2_edid32(new_p64, p32);
1411 break;
1412
1413 case VIDIOC_G_FMT:
1414 case VIDIOC_S_FMT:
1415 case VIDIOC_TRY_FMT:
1416 err = put_v4l2_format32(new_p64, p32);
1417 break;
1418
1419 case VIDIOC_CREATE_BUFS:
1420 err = put_v4l2_create32(new_p64, p32);
1421 break;
1422
1423 case VIDIOC_PREPARE_BUF:
1424 case VIDIOC_QUERYBUF:
1425 case VIDIOC_QBUF:
1426 case VIDIOC_DQBUF:
1427 err = put_v4l2_buffer32(new_p64, p32);
1428 break;
1429
1430 case VIDIOC_ENUMSTD:
1431 err = put_v4l2_standard32(new_p64, p32);
1432 break;
1433
1434 case VIDIOC_ENUMINPUT:
1435 err = put_v4l2_input32(new_p64, p32);
1436 break;
1437 }
1438 return err;
1439 }
1440
1441 /**
1442 * v4l2_compat_ioctl32() - Handles a compat32 ioctl call
1443 *
1444 * @file: pointer to &struct file with the file handler
1445 * @cmd: ioctl to be called
1446 * @arg: arguments passed from/to the ioctl handler
1447 *
1448 * This function is meant to be used as .compat_ioctl fops at v4l2-dev.c
1449 * in order to deal with 32-bit calls on a 64-bits Kernel.
1450 *
1451 * This function calls do_video_ioctl() for non-private V4L2 ioctls.
1452 * If the function is a private one it calls vdev->fops->compat_ioctl32
1453 * instead.
1454 */
1455 long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)
1456 {
1457 struct video_device *vdev = video_devdata(file);
1458 long ret = -ENOIOCTLCMD;
1459
1460 if (!file->f_op->unlocked_ioctl)
1461 return ret;
1462
1463 if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
1464 ret = do_video_ioctl(file, cmd, arg);
1465 else if (vdev->fops->compat_ioctl32)
1466 ret = vdev->fops->compat_ioctl32(file, cmd, arg);
1467
1468 if (ret == -ENOIOCTLCMD)
1469 pr_debug("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)\n",
1470 _IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd);
1471 return ret;
1472 }
1473 EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32);
Linux with added FPC-III support