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media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-compat-ioctl32.c
blob5603c7c1edd54b4d8796babe48b04004663c31e9
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 static long native_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
26 {
27 long ret = -ENOIOCTLCMD;
28
29 if (file->f_op->unlocked_ioctl)
30 ret = file->f_op->unlocked_ioctl(file, cmd, arg);
31
32 return ret;
33 }
34
35
36 struct v4l2_clip32 {
37 struct v4l2_rect c;
38 compat_caddr_t next;
39 };
40
41 struct v4l2_window32 {
42 struct v4l2_rect w;
43 __u32 field; /* enum v4l2_field */
44 __u32 chromakey;
45 compat_caddr_t clips; /* actually struct v4l2_clip32 * */
46 __u32 clipcount;
47 compat_caddr_t bitmap;
48 __u8 global_alpha;
49 };
50
51 static int get_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up)
52 {
53 struct v4l2_clip32 __user *uclips;
54 struct v4l2_clip __user *kclips;
55 compat_caddr_t p;
56 u32 n;
57
58 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
59 copy_from_user(&kp->w, &up->w, sizeof(up->w)) ||
60 get_user(kp->field, &up->field) ||
61 get_user(kp->chromakey, &up->chromakey) ||
62 get_user(kp->clipcount, &up->clipcount) ||
63 get_user(kp->global_alpha, &up->global_alpha))
64 return -EFAULT;
65 if (kp->clipcount > 2048)
66 return -EINVAL;
67 if (!kp->clipcount) {
68 kp->clips = NULL;
69 return 0;
70 }
71
72 n = kp->clipcount;
73 if (get_user(p, &up->clips))
74 return -EFAULT;
75 uclips = compat_ptr(p);
76 kclips = compat_alloc_user_space(n * sizeof(*kclips));
77 kp->clips = kclips;
78 while (n--) {
79 if (copy_in_user(&kclips->c, &uclips->c, sizeof(uclips->c)))
80 return -EFAULT;
81 if (put_user(n ? kclips + 1 : NULL, &kclips->next))
82 return -EFAULT;
83 uclips++;
84 kclips++;
85 }
86 return 0;
87 }
88
89 static int put_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up)
90 {
91 struct v4l2_clip __user *kclips = kp->clips;
92 struct v4l2_clip32 __user *uclips;
93 u32 n = kp->clipcount;
94 compat_caddr_t p;
95
96 if (copy_to_user(&up->w, &kp->w, sizeof(kp->w)) ||
97 put_user(kp->field, &up->field) ||
98 put_user(kp->chromakey, &up->chromakey) ||
99 put_user(kp->clipcount, &up->clipcount) ||
100 put_user(kp->global_alpha, &up->global_alpha))
101 return -EFAULT;
102
103 if (!kp->clipcount)
104 return 0;
105
106 if (get_user(p, &up->clips))
107 return -EFAULT;
108 uclips = compat_ptr(p);
109 while (n--) {
110 if (copy_in_user(&uclips->c, &kclips->c, sizeof(uclips->c)))
111 return -EFAULT;
112 uclips++;
113 kclips++;
114 }
115 return 0;
116 }
117
118 struct v4l2_format32 {
119 __u32 type; /* enum v4l2_buf_type */
120 union {
121 struct v4l2_pix_format pix;
122 struct v4l2_pix_format_mplane pix_mp;
123 struct v4l2_window32 win;
124 struct v4l2_vbi_format vbi;
125 struct v4l2_sliced_vbi_format sliced;
126 struct v4l2_sdr_format sdr;
127 struct v4l2_meta_format meta;
128 __u8 raw_data[200]; /* user-defined */
129 } fmt;
130 };
131
132 /**
133 * struct v4l2_create_buffers32 - VIDIOC_CREATE_BUFS32 argument
134 * @index: on return, index of the first created buffer
135 * @count: entry: number of requested buffers,
136 * return: number of created buffers
137 * @memory: buffer memory type
138 * @format: frame format, for which buffers are requested
139 * @reserved: future extensions
140 */
141 struct v4l2_create_buffers32 {
142 __u32 index;
143 __u32 count;
144 __u32 memory; /* enum v4l2_memory */
145 struct v4l2_format32 format;
146 __u32 reserved[8];
147 };
148
149 static int __get_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
150 {
151 if (get_user(kp->type, &up->type))
152 return -EFAULT;
153
154 switch (kp->type) {
155 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
156 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
157 return copy_from_user(&kp->fmt.pix, &up->fmt.pix,
158 sizeof(kp->fmt.pix)) ? -EFAULT : 0;
159 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
160 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
161 return copy_from_user(&kp->fmt.pix_mp, &up->fmt.pix_mp,
162 sizeof(kp->fmt.pix_mp)) ? -EFAULT : 0;
163 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
164 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
165 return get_v4l2_window32(&kp->fmt.win, &up->fmt.win);
166 case V4L2_BUF_TYPE_VBI_CAPTURE:
167 case V4L2_BUF_TYPE_VBI_OUTPUT:
168 return copy_from_user(&kp->fmt.vbi, &up->fmt.vbi,
169 sizeof(kp->fmt.vbi)) ? -EFAULT : 0;
170 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
171 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
172 return copy_from_user(&kp->fmt.sliced, &up->fmt.sliced,
173 sizeof(kp->fmt.sliced)) ? -EFAULT : 0;
174 case V4L2_BUF_TYPE_SDR_CAPTURE:
175 case V4L2_BUF_TYPE_SDR_OUTPUT:
176 return copy_from_user(&kp->fmt.sdr, &up->fmt.sdr,
177 sizeof(kp->fmt.sdr)) ? -EFAULT : 0;
178 case V4L2_BUF_TYPE_META_CAPTURE:
179 return copy_from_user(&kp->fmt.meta, &up->fmt.meta,
180 sizeof(kp->fmt.meta)) ? -EFAULT : 0;
181 default:
182 return -EINVAL;
183 }
184 }
185
186 static int get_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
187 {
188 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
189 return -EFAULT;
190 return __get_v4l2_format32(kp, up);
191 }
192
193 static int get_v4l2_create32(struct v4l2_create_buffers *kp, struct v4l2_create_buffers32 __user *up)
194 {
195 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
196 copy_from_user(kp, up, offsetof(struct v4l2_create_buffers32, format)))
197 return -EFAULT;
198 return __get_v4l2_format32(&kp->format, &up->format);
199 }
200
201 static int __put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
202 {
203 if (put_user(kp->type, &up->type))
204 return -EFAULT;
205
206 switch (kp->type) {
207 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
208 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
209 return copy_to_user(&up->fmt.pix, &kp->fmt.pix,
210 sizeof(kp->fmt.pix)) ? -EFAULT : 0;
211 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
212 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
213 return copy_to_user(&up->fmt.pix_mp, &kp->fmt.pix_mp,
214 sizeof(kp->fmt.pix_mp)) ? -EFAULT : 0;
215 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
216 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
217 return put_v4l2_window32(&kp->fmt.win, &up->fmt.win);
218 case V4L2_BUF_TYPE_VBI_CAPTURE:
219 case V4L2_BUF_TYPE_VBI_OUTPUT:
220 return copy_to_user(&up->fmt.vbi, &kp->fmt.vbi,
221 sizeof(kp->fmt.vbi)) ? -EFAULT : 0;
222 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
223 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
224 return copy_to_user(&up->fmt.sliced, &kp->fmt.sliced,
225 sizeof(kp->fmt.sliced)) ? -EFAULT : 0;
226 case V4L2_BUF_TYPE_SDR_CAPTURE:
227 case V4L2_BUF_TYPE_SDR_OUTPUT:
228 return copy_to_user(&up->fmt.sdr, &kp->fmt.sdr,
229 sizeof(kp->fmt.sdr)) ? -EFAULT : 0;
230 case V4L2_BUF_TYPE_META_CAPTURE:
231 return copy_to_user(&up->fmt.meta, &kp->fmt.meta,
232 sizeof(kp->fmt.meta)) ? -EFAULT : 0;
233 default:
234 return -EINVAL;
235 }
236 }
237
238 static int put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
239 {
240 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
241 return -EFAULT;
242 return __put_v4l2_format32(kp, up);
243 }
244
245 static int put_v4l2_create32(struct v4l2_create_buffers *kp, struct v4l2_create_buffers32 __user *up)
246 {
247 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
248 copy_to_user(up, kp, offsetof(struct v4l2_create_buffers32, format)) ||
249 copy_to_user(up->reserved, kp->reserved, sizeof(kp->reserved)))
250 return -EFAULT;
251 return __put_v4l2_format32(&kp->format, &up->format);
252 }
253
254 struct v4l2_standard32 {
255 __u32 index;
256 compat_u64 id;
257 __u8 name[24];
258 struct v4l2_fract frameperiod; /* Frames, not fields */
259 __u32 framelines;
260 __u32 reserved[4];
261 };
262
263 static int get_v4l2_standard32(struct v4l2_standard *kp, struct v4l2_standard32 __user *up)
264 {
265 /* other fields are not set by the user, nor used by the driver */
266 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
267 get_user(kp->index, &up->index))
268 return -EFAULT;
269 return 0;
270 }
271
272 static int put_v4l2_standard32(struct v4l2_standard *kp, struct v4l2_standard32 __user *up)
273 {
274 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
275 put_user(kp->index, &up->index) ||
276 put_user(kp->id, &up->id) ||
277 copy_to_user(up->name, kp->name, sizeof(up->name)) ||
278 copy_to_user(&up->frameperiod, &kp->frameperiod,
279 sizeof(kp->frameperiod)) ||
280 put_user(kp->framelines, &up->framelines) ||
281 copy_to_user(up->reserved, kp->reserved, sizeof(kp->reserved)))
282 return -EFAULT;
283 return 0;
284 }
285
286 struct v4l2_plane32 {
287 __u32 bytesused;
288 __u32 length;
289 union {
290 __u32 mem_offset;
291 compat_long_t userptr;
292 __s32 fd;
293 } m;
294 __u32 data_offset;
295 __u32 reserved[11];
296 };
297
298 struct v4l2_buffer32 {
299 __u32 index;
300 __u32 type; /* enum v4l2_buf_type */
301 __u32 bytesused;
302 __u32 flags;
303 __u32 field; /* enum v4l2_field */
304 struct compat_timeval timestamp;
305 struct v4l2_timecode timecode;
306 __u32 sequence;
307
308 /* memory location */
309 __u32 memory; /* enum v4l2_memory */
310 union {
311 __u32 offset;
312 compat_long_t userptr;
313 compat_caddr_t planes;
314 __s32 fd;
315 } m;
316 __u32 length;
317 __u32 reserved2;
318 __u32 reserved;
319 };
320
321 static int get_v4l2_plane32(struct v4l2_plane __user *up, struct v4l2_plane32 __user *up32,
322 enum v4l2_memory memory)
323 {
324 void __user *up_pln;
325 compat_long_t p;
326
327 if (copy_in_user(up, up32, 2 * sizeof(__u32)) ||
328 copy_in_user(&up->data_offset, &up32->data_offset,
329 sizeof(up->data_offset)))
330 return -EFAULT;
331
332 switch (memory) {
333 case V4L2_MEMORY_MMAP:
334 case V4L2_MEMORY_OVERLAY:
335 if (copy_in_user(&up->m.mem_offset, &up32->m.mem_offset,
336 sizeof(up32->m.mem_offset)))
337 return -EFAULT;
338 break;
339 case V4L2_MEMORY_USERPTR:
340 if (get_user(p, &up32->m.userptr))
341 return -EFAULT;
342 up_pln = compat_ptr(p);
343 if (put_user((unsigned long)up_pln, &up->m.userptr))
344 return -EFAULT;
345 break;
346 case V4L2_MEMORY_DMABUF:
347 if (copy_in_user(&up->m.fd, &up32->m.fd, sizeof(up32->m.fd)))
348 return -EFAULT;
349 break;
350 }
351
352 return 0;
353 }
354
355 static int put_v4l2_plane32(struct v4l2_plane __user *up, struct v4l2_plane32 __user *up32,
356 enum v4l2_memory memory)
357 {
358 unsigned long p;
359
360 if (copy_in_user(up32, up, 2 * sizeof(__u32)) ||
361 copy_in_user(&up32->data_offset, &up->data_offset,
362 sizeof(up->data_offset)))
363 return -EFAULT;
364
365 switch (memory) {
366 case V4L2_MEMORY_MMAP:
367 case V4L2_MEMORY_OVERLAY:
368 if (copy_in_user(&up32->m.mem_offset, &up->m.mem_offset,
369 sizeof(up->m.mem_offset)))
370 return -EFAULT;
371 break;
372 case V4L2_MEMORY_USERPTR:
373 if (get_user(p, &up->m.userptr) ||
374 put_user((compat_ulong_t)ptr_to_compat((__force void *)p),
375 &up32->m.userptr))
376 return -EFAULT;
377 break;
378 case V4L2_MEMORY_DMABUF:
379 if (copy_in_user(&up32->m.fd, &up->m.fd,
380 sizeof(up->m.fd)))
381 return -EFAULT;
382 break;
383 }
384
385 return 0;
386 }
387
388 static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user *up)
389 {
390 struct v4l2_plane32 __user *uplane32;
391 struct v4l2_plane __user *uplane;
392 compat_caddr_t p;
393 int ret;
394
395 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
396 get_user(kp->index, &up->index) ||
397 get_user(kp->type, &up->type) ||
398 get_user(kp->flags, &up->flags) ||
399 get_user(kp->memory, &up->memory) ||
400 get_user(kp->length, &up->length))
401 return -EFAULT;
402
403 if (V4L2_TYPE_IS_OUTPUT(kp->type))
404 if (get_user(kp->bytesused, &up->bytesused) ||
405 get_user(kp->field, &up->field) ||
406 get_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
407 get_user(kp->timestamp.tv_usec, &up->timestamp.tv_usec))
408 return -EFAULT;
409
410 if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
411 unsigned int num_planes;
412
413 if (kp->length == 0) {
414 kp->m.planes = NULL;
415 /* num_planes == 0 is legal, e.g. when userspace doesn't
416 * need planes array on DQBUF*/
417 return 0;
418 } else if (kp->length > VIDEO_MAX_PLANES) {
419 return -EINVAL;
420 }
421
422 if (get_user(p, &up->m.planes))
423 return -EFAULT;
424
425 uplane32 = compat_ptr(p);
426 if (!access_ok(VERIFY_READ, uplane32,
427 kp->length * sizeof(*uplane32)))
428 return -EFAULT;
429
430 /* We don't really care if userspace decides to kill itself
431 * by passing a very big num_planes value */
432 uplane = compat_alloc_user_space(kp->length * sizeof(*uplane));
433 kp->m.planes = (__force struct v4l2_plane *)uplane;
434
435 for (num_planes = 0; num_planes < kp->length; num_planes++) {
436 ret = get_v4l2_plane32(uplane, uplane32, kp->memory);
437 if (ret)
438 return ret;
439 ++uplane;
440 ++uplane32;
441 }
442 } else {
443 switch (kp->memory) {
444 case V4L2_MEMORY_MMAP:
445 case V4L2_MEMORY_OVERLAY:
446 if (get_user(kp->m.offset, &up->m.offset))
447 return -EFAULT;
448 break;
449 case V4L2_MEMORY_USERPTR:
450 {
451 compat_long_t tmp;
452
453 if (get_user(tmp, &up->m.userptr))
454 return -EFAULT;
455
456 kp->m.userptr = (unsigned long)compat_ptr(tmp);
457 }
458 break;
459 case V4L2_MEMORY_DMABUF:
460 if (get_user(kp->m.fd, &up->m.fd))
461 return -EFAULT;
462 break;
463 }
464 }
465
466 return 0;
467 }
468
469 static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user *up)
470 {
471 struct v4l2_plane32 __user *uplane32;
472 struct v4l2_plane __user *uplane;
473 compat_caddr_t p;
474 int num_planes;
475 int ret;
476
477 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
478 put_user(kp->index, &up->index) ||
479 put_user(kp->type, &up->type) ||
480 put_user(kp->flags, &up->flags) ||
481 put_user(kp->memory, &up->memory))
482 return -EFAULT;
483
484 if (put_user(kp->bytesused, &up->bytesused) ||
485 put_user(kp->field, &up->field) ||
486 put_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
487 put_user(kp->timestamp.tv_usec, &up->timestamp.tv_usec) ||
488 copy_to_user(&up->timecode, &kp->timecode, sizeof(kp->timecode)) ||
489 put_user(kp->sequence, &up->sequence) ||
490 put_user(kp->reserved2, &up->reserved2) ||
491 put_user(kp->reserved, &up->reserved) ||
492 put_user(kp->length, &up->length))
493 return -EFAULT;
494
495 if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
496 num_planes = kp->length;
497 if (num_planes == 0)
498 return 0;
499
500 uplane = (__force struct v4l2_plane __user *)kp->m.planes;
501 if (get_user(p, &up->m.planes))
502 return -EFAULT;
503 uplane32 = compat_ptr(p);
504
505 while (--num_planes >= 0) {
506 ret = put_v4l2_plane32(uplane, uplane32, kp->memory);
507 if (ret)
508 return ret;
509 ++uplane;
510 ++uplane32;
511 }
512 } else {
513 switch (kp->memory) {
514 case V4L2_MEMORY_MMAP:
515 case V4L2_MEMORY_OVERLAY:
516 if (put_user(kp->m.offset, &up->m.offset))
517 return -EFAULT;
518 break;
519 case V4L2_MEMORY_USERPTR:
520 if (put_user(kp->m.userptr, &up->m.userptr))
521 return -EFAULT;
522 break;
523 case V4L2_MEMORY_DMABUF:
524 if (put_user(kp->m.fd, &up->m.fd))
525 return -EFAULT;
526 break;
527 }
528 }
529
530 return 0;
531 }
532
533 struct v4l2_framebuffer32 {
534 __u32 capability;
535 __u32 flags;
536 compat_caddr_t base;
537 struct {
538 __u32 width;
539 __u32 height;
540 __u32 pixelformat;
541 __u32 field;
542 __u32 bytesperline;
543 __u32 sizeimage;
544 __u32 colorspace;
545 __u32 priv;
546 } fmt;
547 };
548
549 static int get_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_framebuffer32 __user *up)
550 {
551 u32 tmp;
552
553 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
554 get_user(tmp, &up->base) ||
555 get_user(kp->capability, &up->capability) ||
556 get_user(kp->flags, &up->flags) ||
557 copy_from_user(&kp->fmt, &up->fmt, sizeof(up->fmt)))
558 return -EFAULT;
559 kp->base = (__force void *)compat_ptr(tmp);
560 return 0;
561 }
562
563 static int put_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_framebuffer32 __user *up)
564 {
565 u32 tmp = (u32)((unsigned long)kp->base);
566
567 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
568 put_user(tmp, &up->base) ||
569 put_user(kp->capability, &up->capability) ||
570 put_user(kp->flags, &up->flags) ||
571 copy_to_user(&up->fmt, &kp->fmt, sizeof(up->fmt)))
572 return -EFAULT;
573 return 0;
574 }
575
576 struct v4l2_input32 {
577 __u32 index; /* Which input */
578 __u8 name[32]; /* Label */
579 __u32 type; /* Type of input */
580 __u32 audioset; /* Associated audios (bitfield) */
581 __u32 tuner; /* Associated tuner */
582 compat_u64 std;
583 __u32 status;
584 __u32 capabilities;
585 __u32 reserved[3];
586 };
587
588 /* The 64-bit v4l2_input struct has extra padding at the end of the struct.
589 Otherwise it is identical to the 32-bit version. */
590 static inline int get_v4l2_input32(struct v4l2_input *kp, struct v4l2_input32 __user *up)
591 {
592 if (copy_from_user(kp, up, sizeof(*up)))
593 return -EFAULT;
594 return 0;
595 }
596
597 static inline int put_v4l2_input32(struct v4l2_input *kp, struct v4l2_input32 __user *up)
598 {
599 if (copy_to_user(up, kp, sizeof(*up)))
600 return -EFAULT;
601 return 0;
602 }
603
604 struct v4l2_ext_controls32 {
605 __u32 which;
606 __u32 count;
607 __u32 error_idx;
608 __u32 reserved[2];
609 compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */
610 };
611
612 struct v4l2_ext_control32 {
613 __u32 id;
614 __u32 size;
615 __u32 reserved2[1];
616 union {
617 __s32 value;
618 __s64 value64;
619 compat_caddr_t string; /* actually char * */
620 };
621 } __attribute__ ((packed));
622
623 /* Return true if this control is a pointer type. */
624 static inline bool ctrl_is_pointer(struct file *file, u32 id)
625 {
626 struct video_device *vdev = video_devdata(file);
627 struct v4l2_fh *fh = NULL;
628 struct v4l2_ctrl_handler *hdl = NULL;
629 struct v4l2_query_ext_ctrl qec = { id };
630 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;
631
632 if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags))
633 fh = file->private_data;
634
635 if (fh && fh->ctrl_handler)
636 hdl = fh->ctrl_handler;
637 else if (vdev->ctrl_handler)
638 hdl = vdev->ctrl_handler;
639
640 if (hdl) {
641 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id);
642
643 return ctrl && ctrl->is_ptr;
644 }
645
646 if (!ops->vidioc_query_ext_ctrl)
647 return false;
648
649 return !ops->vidioc_query_ext_ctrl(file, fh, &qec) &&
650 (qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD);
651 }
652
653 static int get_v4l2_ext_controls32(struct file *file,
654 struct v4l2_ext_controls *kp,
655 struct v4l2_ext_controls32 __user *up)
656 {
657 struct v4l2_ext_control32 __user *ucontrols;
658 struct v4l2_ext_control __user *kcontrols;
659 unsigned int n;
660 compat_caddr_t p;
661
662 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
663 get_user(kp->which, &up->which) ||
664 get_user(kp->count, &up->count) ||
665 get_user(kp->error_idx, &up->error_idx) ||
666 copy_from_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
667 return -EFAULT;
668 if (kp->count == 0) {
669 kp->controls = NULL;
670 return 0;
671 } else if (kp->count > V4L2_CID_MAX_CTRLS) {
672 return -EINVAL;
673 }
674 if (get_user(p, &up->controls))
675 return -EFAULT;
676 ucontrols = compat_ptr(p);
677 if (!access_ok(VERIFY_READ, ucontrols, kp->count * sizeof(*ucontrols)))
678 return -EFAULT;
679 kcontrols = compat_alloc_user_space(kp->count * sizeof(*kcontrols));
680 kp->controls = (__force struct v4l2_ext_control *)kcontrols;
681 for (n = 0; n < kp->count; n++) {
682 u32 id;
683
684 if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols)))
685 return -EFAULT;
686 if (get_user(id, &kcontrols->id))
687 return -EFAULT;
688 if (ctrl_is_pointer(file, id)) {
689 void __user *s;
690
691 if (get_user(p, &ucontrols->string))
692 return -EFAULT;
693 s = compat_ptr(p);
694 if (put_user(s, &kcontrols->string))
695 return -EFAULT;
696 }
697 ucontrols++;
698 kcontrols++;
699 }
700 return 0;
701 }
702
703 static int put_v4l2_ext_controls32(struct file *file,
704 struct v4l2_ext_controls *kp,
705 struct v4l2_ext_controls32 __user *up)
706 {
707 struct v4l2_ext_control32 __user *ucontrols;
708 struct v4l2_ext_control __user *kcontrols =
709 (__force struct v4l2_ext_control __user *)kp->controls;
710 int n = kp->count;
711 compat_caddr_t p;
712
713 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
714 put_user(kp->which, &up->which) ||
715 put_user(kp->count, &up->count) ||
716 put_user(kp->error_idx, &up->error_idx) ||
717 copy_to_user(up->reserved, kp->reserved, sizeof(up->reserved)))
718 return -EFAULT;
719 if (!kp->count)
720 return 0;
721
722 if (get_user(p, &up->controls))
723 return -EFAULT;
724 ucontrols = compat_ptr(p);
725 if (!access_ok(VERIFY_WRITE, ucontrols, n * sizeof(*ucontrols)))
726 return -EFAULT;
727
728 while (--n >= 0) {
729 unsigned size = sizeof(*ucontrols);
730 u32 id;
731
732 if (get_user(id, &kcontrols->id))
733 return -EFAULT;
734 /* Do not modify the pointer when copying a pointer control.
735 The contents of the pointer was changed, not the pointer
736 itself. */
737 if (ctrl_is_pointer(file, id))
738 size -= sizeof(ucontrols->value64);
739 if (copy_in_user(ucontrols, kcontrols, size))
740 return -EFAULT;
741 ucontrols++;
742 kcontrols++;
743 }
744 return 0;
745 }
746
747 struct v4l2_event32 {
748 __u32 type;
749 union {
750 compat_s64 value64;
751 __u8 data[64];
752 } u;
753 __u32 pending;
754 __u32 sequence;
755 struct compat_timespec timestamp;
756 __u32 id;
757 __u32 reserved[8];
758 };
759
760 static int put_v4l2_event32(struct v4l2_event *kp, struct v4l2_event32 __user *up)
761 {
762 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
763 put_user(kp->type, &up->type) ||
764 copy_to_user(&up->u, &kp->u, sizeof(kp->u)) ||
765 put_user(kp->pending, &up->pending) ||
766 put_user(kp->sequence, &up->sequence) ||
767 put_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
768 put_user(kp->timestamp.tv_nsec, &up->timestamp.tv_nsec) ||
769 put_user(kp->id, &up->id) ||
770 copy_to_user(up->reserved, kp->reserved, sizeof(kp->reserved)))
771 return -EFAULT;
772 return 0;
773 }
774
775 struct v4l2_edid32 {
776 __u32 pad;
777 __u32 start_block;
778 __u32 blocks;
779 __u32 reserved[5];
780 compat_caddr_t edid;
781 };
782
783 static int get_v4l2_edid32(struct v4l2_edid *kp, struct v4l2_edid32 __user *up)
784 {
785 u32 tmp;
786
787 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
788 get_user(kp->pad, &up->pad) ||
789 get_user(kp->start_block, &up->start_block) ||
790 get_user(kp->blocks, &up->blocks) ||
791 get_user(tmp, &up->edid) ||
792 copy_from_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
793 return -EFAULT;
794 kp->edid = (__force u8 *)compat_ptr(tmp);
795 return 0;
796 }
797
798 static int put_v4l2_edid32(struct v4l2_edid *kp, struct v4l2_edid32 __user *up)
799 {
800 u32 tmp = (u32)((unsigned long)kp->edid);
801
802 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
803 put_user(kp->pad, &up->pad) ||
804 put_user(kp->start_block, &up->start_block) ||
805 put_user(kp->blocks, &up->blocks) ||
806 put_user(tmp, &up->edid) ||
807 copy_to_user(up->reserved, kp->reserved, sizeof(up->reserved)))
808 return -EFAULT;
809 return 0;
810 }
811
812
813 #define VIDIOC_G_FMT32 _IOWR('V', 4, struct v4l2_format32)
814 #define VIDIOC_S_FMT32 _IOWR('V', 5, struct v4l2_format32)
815 #define VIDIOC_QUERYBUF32 _IOWR('V', 9, struct v4l2_buffer32)
816 #define VIDIOC_G_FBUF32 _IOR ('V', 10, struct v4l2_framebuffer32)
817 #define VIDIOC_S_FBUF32 _IOW ('V', 11, struct v4l2_framebuffer32)
818 #define VIDIOC_QBUF32 _IOWR('V', 15, struct v4l2_buffer32)
819 #define VIDIOC_DQBUF32 _IOWR('V', 17, struct v4l2_buffer32)
820 #define VIDIOC_ENUMSTD32 _IOWR('V', 25, struct v4l2_standard32)
821 #define VIDIOC_ENUMINPUT32 _IOWR('V', 26, struct v4l2_input32)
822 #define VIDIOC_G_EDID32 _IOWR('V', 40, struct v4l2_edid32)
823 #define VIDIOC_S_EDID32 _IOWR('V', 41, struct v4l2_edid32)
824 #define VIDIOC_TRY_FMT32 _IOWR('V', 64, struct v4l2_format32)
825 #define VIDIOC_G_EXT_CTRLS32 _IOWR('V', 71, struct v4l2_ext_controls32)
826 #define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32)
827 #define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32)
828 #define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32)
829 #define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32)
830 #define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32)
831
832 #define VIDIOC_OVERLAY32 _IOW ('V', 14, s32)
833 #define VIDIOC_STREAMON32 _IOW ('V', 18, s32)
834 #define VIDIOC_STREAMOFF32 _IOW ('V', 19, s32)
835 #define VIDIOC_G_INPUT32 _IOR ('V', 38, s32)
836 #define VIDIOC_S_INPUT32 _IOWR('V', 39, s32)
837 #define VIDIOC_G_OUTPUT32 _IOR ('V', 46, s32)
838 #define VIDIOC_S_OUTPUT32 _IOWR('V', 47, s32)
839
840 static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
841 {
842 union {
843 struct v4l2_format v2f;
844 struct v4l2_buffer v2b;
845 struct v4l2_framebuffer v2fb;
846 struct v4l2_input v2i;
847 struct v4l2_standard v2s;
848 struct v4l2_ext_controls v2ecs;
849 struct v4l2_event v2ev;
850 struct v4l2_create_buffers v2crt;
851 struct v4l2_edid v2edid;
852 unsigned long vx;
853 int vi;
854 } karg;
855 void __user *up = compat_ptr(arg);
856 int compatible_arg = 1;
857 long err = 0;
858
859 /* First, convert the command. */
860 switch (cmd) {
861 case VIDIOC_G_FMT32: cmd = VIDIOC_G_FMT; break;
862 case VIDIOC_S_FMT32: cmd = VIDIOC_S_FMT; break;
863 case VIDIOC_QUERYBUF32: cmd = VIDIOC_QUERYBUF; break;
864 case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break;
865 case VIDIOC_S_FBUF32: cmd = VIDIOC_S_FBUF; break;
866 case VIDIOC_QBUF32: cmd = VIDIOC_QBUF; break;
867 case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break;
868 case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break;
869 case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break;
870 case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break;
871 case VIDIOC_G_EXT_CTRLS32: cmd = VIDIOC_G_EXT_CTRLS; break;
872 case VIDIOC_S_EXT_CTRLS32: cmd = VIDIOC_S_EXT_CTRLS; break;
873 case VIDIOC_TRY_EXT_CTRLS32: cmd = VIDIOC_TRY_EXT_CTRLS; break;
874 case VIDIOC_DQEVENT32: cmd = VIDIOC_DQEVENT; break;
875 case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break;
876 case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break;
877 case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break;
878 case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break;
879 case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break;
880 case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break;
881 case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break;
882 case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break;
883 case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break;
884 case VIDIOC_G_EDID32: cmd = VIDIOC_G_EDID; break;
885 case VIDIOC_S_EDID32: cmd = VIDIOC_S_EDID; break;
886 }
887
888 switch (cmd) {
889 case VIDIOC_OVERLAY:
890 case VIDIOC_STREAMON:
891 case VIDIOC_STREAMOFF:
892 case VIDIOC_S_INPUT:
893 case VIDIOC_S_OUTPUT:
894 err = get_user(karg.vi, (s32 __user *)up);
895 compatible_arg = 0;
896 break;
897
898 case VIDIOC_G_INPUT:
899 case VIDIOC_G_OUTPUT:
900 compatible_arg = 0;
901 break;
902
903 case VIDIOC_G_EDID:
904 case VIDIOC_S_EDID:
905 err = get_v4l2_edid32(&karg.v2edid, up);
906 compatible_arg = 0;
907 break;
908
909 case VIDIOC_G_FMT:
910 case VIDIOC_S_FMT:
911 case VIDIOC_TRY_FMT:
912 err = get_v4l2_format32(&karg.v2f, up);
913 compatible_arg = 0;
914 break;
915
916 case VIDIOC_CREATE_BUFS:
917 err = get_v4l2_create32(&karg.v2crt, up);
918 compatible_arg = 0;
919 break;
920
921 case VIDIOC_PREPARE_BUF:
922 case VIDIOC_QUERYBUF:
923 case VIDIOC_QBUF:
924 case VIDIOC_DQBUF:
925 err = get_v4l2_buffer32(&karg.v2b, up);
926 compatible_arg = 0;
927 break;
928
929 case VIDIOC_S_FBUF:
930 err = get_v4l2_framebuffer32(&karg.v2fb, up);
931 compatible_arg = 0;
932 break;
933
934 case VIDIOC_G_FBUF:
935 compatible_arg = 0;
936 break;
937
938 case VIDIOC_ENUMSTD:
939 err = get_v4l2_standard32(&karg.v2s, up);
940 compatible_arg = 0;
941 break;
942
943 case VIDIOC_ENUMINPUT:
944 err = get_v4l2_input32(&karg.v2i, up);
945 compatible_arg = 0;
946 break;
947
948 case VIDIOC_G_EXT_CTRLS:
949 case VIDIOC_S_EXT_CTRLS:
950 case VIDIOC_TRY_EXT_CTRLS:
951 err = get_v4l2_ext_controls32(file, &karg.v2ecs, up);
952 compatible_arg = 0;
953 break;
954 case VIDIOC_DQEVENT:
955 compatible_arg = 0;
956 break;
957 }
958 if (err)
959 return err;
960
961 if (compatible_arg)
962 err = native_ioctl(file, cmd, (unsigned long)up);
963 else {
964 mm_segment_t old_fs = get_fs();
965
966 set_fs(KERNEL_DS);
967 err = native_ioctl(file, cmd, (unsigned long)&karg);
968 set_fs(old_fs);
969 }
970
971 if (err == -ENOTTY)
972 return err;
973
974 /* Special case: even after an error we need to put the
975 results back for these ioctls since the error_idx will
976 contain information on which control failed. */
977 switch (cmd) {
978 case VIDIOC_G_EXT_CTRLS:
979 case VIDIOC_S_EXT_CTRLS:
980 case VIDIOC_TRY_EXT_CTRLS:
981 if (put_v4l2_ext_controls32(file, &karg.v2ecs, up))
982 err = -EFAULT;
983 break;
984 case VIDIOC_S_EDID:
985 if (put_v4l2_edid32(&karg.v2edid, up))
986 err = -EFAULT;
987 break;
988 }
989 if (err)
990 return err;
991
992 switch (cmd) {
993 case VIDIOC_S_INPUT:
994 case VIDIOC_S_OUTPUT:
995 case VIDIOC_G_INPUT:
996 case VIDIOC_G_OUTPUT:
997 err = put_user(((s32)karg.vi), (s32 __user *)up);
998 break;
999
1000 case VIDIOC_G_FBUF:
1001 err = put_v4l2_framebuffer32(&karg.v2fb, up);
1002 break;
1003
1004 case VIDIOC_DQEVENT:
1005 err = put_v4l2_event32(&karg.v2ev, up);
1006 break;
1007
1008 case VIDIOC_G_EDID:
1009 err = put_v4l2_edid32(&karg.v2edid, up);
1010 break;
1011
1012 case VIDIOC_G_FMT:
1013 case VIDIOC_S_FMT:
1014 case VIDIOC_TRY_FMT:
1015 err = put_v4l2_format32(&karg.v2f, up);
1016 break;
1017
1018 case VIDIOC_CREATE_BUFS:
1019 err = put_v4l2_create32(&karg.v2crt, up);
1020 break;
1021
1022 case VIDIOC_PREPARE_BUF:
1023 case VIDIOC_QUERYBUF:
1024 case VIDIOC_QBUF:
1025 case VIDIOC_DQBUF:
1026 err = put_v4l2_buffer32(&karg.v2b, up);
1027 break;
1028
1029 case VIDIOC_ENUMSTD:
1030 err = put_v4l2_standard32(&karg.v2s, up);
1031 break;
1032
1033 case VIDIOC_ENUMINPUT:
1034 err = put_v4l2_input32(&karg.v2i, up);
1035 break;
1036 }
1037 return err;
1038 }
1039
1040 long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)
1041 {
1042 struct video_device *vdev = video_devdata(file);
1043 long ret = -ENOIOCTLCMD;
1044
1045 if (!file->f_op->unlocked_ioctl)
1046 return ret;
1047
1048 if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
1049 ret = do_video_ioctl(file, cmd, arg);
1050 else if (vdev->fops->compat_ioctl32)
1051 ret = vdev->fops->compat_ioctl32(file, cmd, arg);
1052
1053 if (ret == -ENOIOCTLCMD)
1054 pr_debug("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)\n",
1055 _IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd);
1056 return ret;
1057 }
1058 EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32);
Linux with added FPC-III support