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/videodev2.h>
18 #include <linux/module.h>
19 #include <media/v4l2-ioctl.h>
20 
21 #ifdef CONFIG_COMPAT
22 
native_ioctl(struct file * file,unsigned int cmd,unsigned long arg)23 static long native_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
24 {
25 	long ret = -ENOIOCTLCMD;
26 
27 	if (file->f_op->unlocked_ioctl)
28 		ret = file->f_op->unlocked_ioctl(file, cmd, arg);
29 
30 	return ret;
31 }
32 
33 
34 struct v4l2_clip32 {
35 	struct v4l2_rect        c;
36 	compat_caddr_t 		next;
37 };
38 
39 struct v4l2_window32 {
40 	struct v4l2_rect        w;
41 	enum v4l2_field  	field;
42 	__u32			chromakey;
43 	compat_caddr_t		clips; /* actually struct v4l2_clip32 * */
44 	__u32			clipcount;
45 	compat_caddr_t		bitmap;
46 };
47 
get_v4l2_window32(struct v4l2_window * kp,struct v4l2_window32 __user * up)48 static int get_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up)
49 {
50 	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_window32)) ||
51 		copy_from_user(&kp->w, &up->w, sizeof(up->w)) ||
52 		get_user(kp->field, &up->field) ||
53 		get_user(kp->chromakey, &up->chromakey) ||
54 		get_user(kp->clipcount, &up->clipcount))
55 			return -EFAULT;
56 	if (kp->clipcount > 2048)
57 		return -EINVAL;
58 	if (kp->clipcount) {
59 		struct v4l2_clip32 __user *uclips;
60 		struct v4l2_clip __user *kclips;
61 		int n = kp->clipcount;
62 		compat_caddr_t p;
63 
64 		if (get_user(p, &up->clips))
65 			return -EFAULT;
66 		uclips = compat_ptr(p);
67 		kclips = compat_alloc_user_space(n * sizeof(struct v4l2_clip));
68 		kp->clips = kclips;
69 		while (--n >= 0) {
70 			if (copy_in_user(&kclips->c, &uclips->c, sizeof(uclips->c)))
71 				return -EFAULT;
72 			if (put_user(n ? kclips + 1 : NULL, &kclips->next))
73 				return -EFAULT;
74 			uclips += 1;
75 			kclips += 1;
76 		}
77 	} else
78 		kp->clips = NULL;
79 	return 0;
80 }
81 
put_v4l2_window32(struct v4l2_window * kp,struct v4l2_window32 __user * up)82 static int put_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up)
83 {
84 	if (copy_to_user(&up->w, &kp->w, sizeof(kp->w)) ||
85 		put_user(kp->field, &up->field) ||
86 		put_user(kp->chromakey, &up->chromakey) ||
87 		put_user(kp->clipcount, &up->clipcount))
88 			return -EFAULT;
89 	return 0;
90 }
91 
get_v4l2_pix_format(struct v4l2_pix_format * kp,struct v4l2_pix_format __user * up)92 static inline int get_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up)
93 {
94 	if (copy_from_user(kp, up, sizeof(struct v4l2_pix_format)))
95 		return -EFAULT;
96 	return 0;
97 }
98 
get_v4l2_pix_format_mplane(struct v4l2_pix_format_mplane * kp,struct v4l2_pix_format_mplane __user * up)99 static inline int get_v4l2_pix_format_mplane(struct v4l2_pix_format_mplane *kp,
100 				struct v4l2_pix_format_mplane __user *up)
101 {
102 	if (copy_from_user(kp, up, sizeof(struct v4l2_pix_format_mplane)))
103 		return -EFAULT;
104 	return 0;
105 }
106 
put_v4l2_pix_format(struct v4l2_pix_format * kp,struct v4l2_pix_format __user * up)107 static inline int put_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up)
108 {
109 	if (copy_to_user(up, kp, sizeof(struct v4l2_pix_format)))
110 		return -EFAULT;
111 	return 0;
112 }
113 
put_v4l2_pix_format_mplane(struct v4l2_pix_format_mplane * kp,struct v4l2_pix_format_mplane __user * up)114 static inline int put_v4l2_pix_format_mplane(struct v4l2_pix_format_mplane *kp,
115 				struct v4l2_pix_format_mplane __user *up)
116 {
117 	if (copy_to_user(up, kp, sizeof(struct v4l2_pix_format_mplane)))
118 		return -EFAULT;
119 	return 0;
120 }
121 
get_v4l2_vbi_format(struct v4l2_vbi_format * kp,struct v4l2_vbi_format __user * up)122 static inline int get_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up)
123 {
124 	if (copy_from_user(kp, up, sizeof(struct v4l2_vbi_format)))
125 		return -EFAULT;
126 	return 0;
127 }
128 
put_v4l2_vbi_format(struct v4l2_vbi_format * kp,struct v4l2_vbi_format __user * up)129 static inline int put_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up)
130 {
131 	if (copy_to_user(up, kp, sizeof(struct v4l2_vbi_format)))
132 		return -EFAULT;
133 	return 0;
134 }
135 
get_v4l2_sliced_vbi_format(struct v4l2_sliced_vbi_format * kp,struct v4l2_sliced_vbi_format __user * up)136 static inline int get_v4l2_sliced_vbi_format(struct v4l2_sliced_vbi_format *kp, struct v4l2_sliced_vbi_format __user *up)
137 {
138 	if (copy_from_user(kp, up, sizeof(struct v4l2_sliced_vbi_format)))
139 		return -EFAULT;
140 	return 0;
141 }
142 
put_v4l2_sliced_vbi_format(struct v4l2_sliced_vbi_format * kp,struct v4l2_sliced_vbi_format __user * up)143 static inline int put_v4l2_sliced_vbi_format(struct v4l2_sliced_vbi_format *kp, struct v4l2_sliced_vbi_format __user *up)
144 {
145 	if (copy_to_user(up, kp, sizeof(struct v4l2_sliced_vbi_format)))
146 		return -EFAULT;
147 	return 0;
148 }
149 
150 struct v4l2_format32 {
151 	enum v4l2_buf_type type;
152 	union {
153 		struct v4l2_pix_format	pix;
154 		struct v4l2_pix_format_mplane	pix_mp;
155 		struct v4l2_window32	win;
156 		struct v4l2_vbi_format	vbi;
157 		struct v4l2_sliced_vbi_format	sliced;
158 		__u8	raw_data[200];        /* user-defined */
159 	} fmt;
160 };
161 
162 /**
163  * struct v4l2_create_buffers32 - VIDIOC_CREATE_BUFS32 argument
164  * @index:	on return, index of the first created buffer
165  * @count:	entry: number of requested buffers,
166  *		return: number of created buffers
167  * @memory:	buffer memory type
168  * @format:	frame format, for which buffers are requested
169  * @reserved:	future extensions
170  */
171 struct v4l2_create_buffers32 {
172 	__u32			index;
173 	__u32			count;
174 	enum v4l2_memory        memory;
175 	struct v4l2_format32	format;
176 	__u32			reserved[8];
177 };
178 
__get_v4l2_format32(struct v4l2_format * kp,struct v4l2_format32 __user * up)179 static int __get_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
180 {
181 	switch (kp->type) {
182 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
183 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
184 		return get_v4l2_pix_format(&kp->fmt.pix, &up->fmt.pix);
185 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
186 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
187 		return get_v4l2_pix_format_mplane(&kp->fmt.pix_mp,
188 						  &up->fmt.pix_mp);
189 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
190 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
191 		return get_v4l2_window32(&kp->fmt.win, &up->fmt.win);
192 	case V4L2_BUF_TYPE_VBI_CAPTURE:
193 	case V4L2_BUF_TYPE_VBI_OUTPUT:
194 		return get_v4l2_vbi_format(&kp->fmt.vbi, &up->fmt.vbi);
195 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
196 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
197 		return get_v4l2_sliced_vbi_format(&kp->fmt.sliced, &up->fmt.sliced);
198 	case V4L2_BUF_TYPE_PRIVATE:
199 		if (copy_from_user(kp, up, sizeof(kp->fmt.raw_data)))
200 			return -EFAULT;
201 		return 0;
202 	default:
203 		printk(KERN_INFO "compat_ioctl32: unexpected VIDIOC_FMT type %d\n",
204 								kp->type);
205 		return -EINVAL;
206 	}
207 }
208 
get_v4l2_format32(struct v4l2_format * kp,struct v4l2_format32 __user * up)209 static int get_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
210 {
211 	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_format32)) ||
212 			get_user(kp->type, &up->type))
213 			return -EFAULT;
214 	return __get_v4l2_format32(kp, up);
215 }
216 
get_v4l2_create32(struct v4l2_create_buffers * kp,struct v4l2_create_buffers32 __user * up)217 static int get_v4l2_create32(struct v4l2_create_buffers *kp, struct v4l2_create_buffers32 __user *up)
218 {
219 	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_create_buffers32)) ||
220 	    copy_from_user(kp, up, offsetof(struct v4l2_create_buffers32, format.fmt)))
221 			return -EFAULT;
222 	return __get_v4l2_format32(&kp->format, &up->format);
223 }
224 
__put_v4l2_format32(struct v4l2_format * kp,struct v4l2_format32 __user * up)225 static int __put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
226 {
227 	switch (kp->type) {
228 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
229 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
230 		return put_v4l2_pix_format(&kp->fmt.pix, &up->fmt.pix);
231 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
232 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
233 		return put_v4l2_pix_format_mplane(&kp->fmt.pix_mp,
234 						  &up->fmt.pix_mp);
235 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
236 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
237 		return put_v4l2_window32(&kp->fmt.win, &up->fmt.win);
238 	case V4L2_BUF_TYPE_VBI_CAPTURE:
239 	case V4L2_BUF_TYPE_VBI_OUTPUT:
240 		return put_v4l2_vbi_format(&kp->fmt.vbi, &up->fmt.vbi);
241 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
242 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
243 		return put_v4l2_sliced_vbi_format(&kp->fmt.sliced, &up->fmt.sliced);
244 	case V4L2_BUF_TYPE_PRIVATE:
245 		if (copy_to_user(up, kp, sizeof(up->fmt.raw_data)))
246 			return -EFAULT;
247 		return 0;
248 	default:
249 		printk(KERN_INFO "compat_ioctl32: unexpected VIDIOC_FMT type %d\n",
250 								kp->type);
251 		return -EINVAL;
252 	}
253 }
254 
put_v4l2_format32(struct v4l2_format * kp,struct v4l2_format32 __user * up)255 static int put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 __user *up)
256 {
257 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_format32)) ||
258 		put_user(kp->type, &up->type))
259 		return -EFAULT;
260 	return __put_v4l2_format32(kp, up);
261 }
262 
put_v4l2_create32(struct v4l2_create_buffers * kp,struct v4l2_create_buffers32 __user * up)263 static int put_v4l2_create32(struct v4l2_create_buffers *kp, struct v4l2_create_buffers32 __user *up)
264 {
265 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_create_buffers32)) ||
266 	    copy_to_user(up, kp, offsetof(struct v4l2_create_buffers32, format.fmt)))
267 			return -EFAULT;
268 	return __put_v4l2_format32(&kp->format, &up->format);
269 }
270 
271 struct v4l2_standard32 {
272 	__u32		     index;
273 	__u32		     id[2]; /* __u64 would get the alignment wrong */
274 	__u8		     name[24];
275 	struct v4l2_fract    frameperiod; /* Frames, not fields */
276 	__u32		     framelines;
277 	__u32		     reserved[4];
278 };
279 
get_v4l2_standard32(struct v4l2_standard * kp,struct v4l2_standard32 __user * up)280 static int get_v4l2_standard32(struct v4l2_standard *kp, struct v4l2_standard32 __user *up)
281 {
282 	/* other fields are not set by the user, nor used by the driver */
283 	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_standard32)) ||
284 		get_user(kp->index, &up->index))
285 		return -EFAULT;
286 	return 0;
287 }
288 
put_v4l2_standard32(struct v4l2_standard * kp,struct v4l2_standard32 __user * up)289 static int put_v4l2_standard32(struct v4l2_standard *kp, struct v4l2_standard32 __user *up)
290 {
291 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_standard32)) ||
292 		put_user(kp->index, &up->index) ||
293 		copy_to_user(up->id, &kp->id, sizeof(__u64)) ||
294 		copy_to_user(up->name, kp->name, 24) ||
295 		copy_to_user(&up->frameperiod, &kp->frameperiod, sizeof(kp->frameperiod)) ||
296 		put_user(kp->framelines, &up->framelines) ||
297 		copy_to_user(up->reserved, kp->reserved, 4 * sizeof(__u32)))
298 			return -EFAULT;
299 	return 0;
300 }
301 
302 struct v4l2_plane32 {
303 	__u32			bytesused;
304 	__u32			length;
305 	union {
306 		__u32		mem_offset;
307 		compat_long_t	userptr;
308 	} m;
309 	__u32			data_offset;
310 	__u32			reserved[11];
311 };
312 
313 struct v4l2_buffer32 {
314 	__u32			index;
315 	enum v4l2_buf_type      type;
316 	__u32			bytesused;
317 	__u32			flags;
318 	enum v4l2_field		field;
319 	struct compat_timeval	timestamp;
320 	struct v4l2_timecode	timecode;
321 	__u32			sequence;
322 
323 	/* memory location */
324 	enum v4l2_memory        memory;
325 	union {
326 		__u32           offset;
327 		compat_long_t   userptr;
328 		compat_caddr_t  planes;
329 	} m;
330 	__u32			length;
331 	__u32			input;
332 	__u32			reserved;
333 };
334 
get_v4l2_plane32(struct v4l2_plane * up,struct v4l2_plane32 * up32,enum v4l2_memory memory)335 static int get_v4l2_plane32(struct v4l2_plane *up, struct v4l2_plane32 *up32,
336 				enum v4l2_memory memory)
337 {
338 	void __user *up_pln;
339 	compat_long_t p;
340 
341 	if (copy_in_user(up, up32, 2 * sizeof(__u32)) ||
342 		copy_in_user(&up->data_offset, &up32->data_offset,
343 				sizeof(__u32)))
344 		return -EFAULT;
345 
346 	if (memory == V4L2_MEMORY_USERPTR) {
347 		if (get_user(p, &up32->m.userptr))
348 			return -EFAULT;
349 		up_pln = compat_ptr(p);
350 		if (put_user((unsigned long)up_pln, &up->m.userptr))
351 			return -EFAULT;
352 	} else {
353 		if (copy_in_user(&up->m.mem_offset, &up32->m.mem_offset,
354 					sizeof(__u32)))
355 			return -EFAULT;
356 	}
357 
358 	return 0;
359 }
360 
put_v4l2_plane32(struct v4l2_plane * up,struct v4l2_plane32 * up32,enum v4l2_memory memory)361 static int put_v4l2_plane32(struct v4l2_plane *up, struct v4l2_plane32 *up32,
362 				enum v4l2_memory memory)
363 {
364 	if (copy_in_user(up32, up, 2 * sizeof(__u32)) ||
365 		copy_in_user(&up32->data_offset, &up->data_offset,
366 				sizeof(__u32)))
367 		return -EFAULT;
368 
369 	/* For MMAP, driver might've set up the offset, so copy it back.
370 	 * USERPTR stays the same (was userspace-provided), so no copying. */
371 	if (memory == V4L2_MEMORY_MMAP)
372 		if (copy_in_user(&up32->m.mem_offset, &up->m.mem_offset,
373 					sizeof(__u32)))
374 			return -EFAULT;
375 
376 	return 0;
377 }
378 
get_v4l2_buffer32(struct v4l2_buffer * kp,struct v4l2_buffer32 __user * up)379 static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user *up)
380 {
381 	struct v4l2_plane32 __user *uplane32;
382 	struct v4l2_plane __user *uplane;
383 	compat_caddr_t p;
384 	int num_planes;
385 	int ret;
386 
387 	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_buffer32)) ||
388 		get_user(kp->index, &up->index) ||
389 		get_user(kp->type, &up->type) ||
390 		get_user(kp->flags, &up->flags) ||
391 		get_user(kp->memory, &up->memory) ||
392 		get_user(kp->input, &up->input))
393 			return -EFAULT;
394 
395 	if (V4L2_TYPE_IS_OUTPUT(kp->type))
396 		if (get_user(kp->bytesused, &up->bytesused) ||
397 			get_user(kp->field, &up->field) ||
398 			get_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
399 			get_user(kp->timestamp.tv_usec,
400 					&up->timestamp.tv_usec))
401 			return -EFAULT;
402 
403 	if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
404 		if (get_user(kp->length, &up->length))
405 			return -EFAULT;
406 
407 		num_planes = kp->length;
408 		if (num_planes == 0) {
409 			kp->m.planes = NULL;
410 			/* num_planes == 0 is legal, e.g. when userspace doesn't
411 			 * need planes array on DQBUF*/
412 			return 0;
413 		}
414 
415 		if (get_user(p, &up->m.planes))
416 			return -EFAULT;
417 
418 		uplane32 = compat_ptr(p);
419 		if (!access_ok(VERIFY_READ, uplane32,
420 				num_planes * sizeof(struct v4l2_plane32)))
421 			return -EFAULT;
422 
423 		/* We don't really care if userspace decides to kill itself
424 		 * by passing a very big num_planes value */
425 		uplane = compat_alloc_user_space(num_planes *
426 						sizeof(struct v4l2_plane));
427 		kp->m.planes = uplane;
428 
429 		while (--num_planes >= 0) {
430 			ret = get_v4l2_plane32(uplane, uplane32, kp->memory);
431 			if (ret)
432 				return ret;
433 			++uplane;
434 			++uplane32;
435 		}
436 	} else {
437 		switch (kp->memory) {
438 		case V4L2_MEMORY_MMAP:
439 			if (get_user(kp->length, &up->length) ||
440 				get_user(kp->m.offset, &up->m.offset))
441 				return -EFAULT;
442 			break;
443 		case V4L2_MEMORY_USERPTR:
444 			{
445 			compat_long_t tmp;
446 
447 			if (get_user(kp->length, &up->length) ||
448 			    get_user(tmp, &up->m.userptr))
449 				return -EFAULT;
450 
451 			kp->m.userptr = (unsigned long)compat_ptr(tmp);
452 			}
453 			break;
454 		case V4L2_MEMORY_OVERLAY:
455 			if (get_user(kp->m.offset, &up->m.offset))
456 				return -EFAULT;
457 			break;
458 		}
459 	}
460 
461 	return 0;
462 }
463 
put_v4l2_buffer32(struct v4l2_buffer * kp,struct v4l2_buffer32 __user * up)464 static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user *up)
465 {
466 	struct v4l2_plane32 __user *uplane32;
467 	struct v4l2_plane __user *uplane;
468 	compat_caddr_t p;
469 	int num_planes;
470 	int ret;
471 
472 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_buffer32)) ||
473 		put_user(kp->index, &up->index) ||
474 		put_user(kp->type, &up->type) ||
475 		put_user(kp->flags, &up->flags) ||
476 		put_user(kp->memory, &up->memory) ||
477 		put_user(kp->input, &up->input))
478 			return -EFAULT;
479 
480 	if (put_user(kp->bytesused, &up->bytesused) ||
481 		put_user(kp->field, &up->field) ||
482 		put_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
483 		put_user(kp->timestamp.tv_usec, &up->timestamp.tv_usec) ||
484 		copy_to_user(&up->timecode, &kp->timecode, sizeof(struct v4l2_timecode)) ||
485 		put_user(kp->sequence, &up->sequence) ||
486 		put_user(kp->reserved, &up->reserved))
487 			return -EFAULT;
488 
489 	if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
490 		num_planes = kp->length;
491 		if (num_planes == 0)
492 			return 0;
493 
494 		uplane = kp->m.planes;
495 		if (get_user(p, &up->m.planes))
496 			return -EFAULT;
497 		uplane32 = compat_ptr(p);
498 
499 		while (--num_planes >= 0) {
500 			ret = put_v4l2_plane32(uplane, uplane32, kp->memory);
501 			if (ret)
502 				return ret;
503 			++uplane;
504 			++uplane32;
505 		}
506 	} else {
507 		switch (kp->memory) {
508 		case V4L2_MEMORY_MMAP:
509 			if (put_user(kp->length, &up->length) ||
510 				put_user(kp->m.offset, &up->m.offset))
511 				return -EFAULT;
512 			break;
513 		case V4L2_MEMORY_USERPTR:
514 			if (put_user(kp->length, &up->length) ||
515 				put_user(kp->m.userptr, &up->m.userptr))
516 				return -EFAULT;
517 			break;
518 		case V4L2_MEMORY_OVERLAY:
519 			if (put_user(kp->m.offset, &up->m.offset))
520 				return -EFAULT;
521 			break;
522 		}
523 	}
524 
525 	return 0;
526 }
527 
528 struct v4l2_framebuffer32 {
529 	__u32			capability;
530 	__u32			flags;
531 	compat_caddr_t 		base;
532 	struct v4l2_pix_format	fmt;
533 };
534 
get_v4l2_framebuffer32(struct v4l2_framebuffer * kp,struct v4l2_framebuffer32 __user * up)535 static int get_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_framebuffer32 __user *up)
536 {
537 	u32 tmp;
538 
539 	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_framebuffer32)) ||
540 		get_user(tmp, &up->base) ||
541 		get_user(kp->capability, &up->capability) ||
542 		get_user(kp->flags, &up->flags))
543 			return -EFAULT;
544 	kp->base = compat_ptr(tmp);
545 	get_v4l2_pix_format(&kp->fmt, &up->fmt);
546 	return 0;
547 }
548 
put_v4l2_framebuffer32(struct v4l2_framebuffer * kp,struct v4l2_framebuffer32 __user * up)549 static int put_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_framebuffer32 __user *up)
550 {
551 	u32 tmp = (u32)((unsigned long)kp->base);
552 
553 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_framebuffer32)) ||
554 		put_user(tmp, &up->base) ||
555 		put_user(kp->capability, &up->capability) ||
556 		put_user(kp->flags, &up->flags))
557 			return -EFAULT;
558 	put_v4l2_pix_format(&kp->fmt, &up->fmt);
559 	return 0;
560 }
561 
562 struct v4l2_input32 {
563 	__u32	     index;		/*  Which input */
564 	__u8	     name[32];		/*  Label */
565 	__u32	     type;		/*  Type of input */
566 	__u32	     audioset;		/*  Associated audios (bitfield) */
567 	__u32        tuner;             /*  Associated tuner */
568 	v4l2_std_id  std;
569 	__u32	     status;
570 	__u32	     reserved[4];
571 } __attribute__ ((packed));
572 
573 /* The 64-bit v4l2_input struct has extra padding at the end of the struct.
574    Otherwise it is identical to the 32-bit version. */
get_v4l2_input32(struct v4l2_input * kp,struct v4l2_input32 __user * up)575 static inline int get_v4l2_input32(struct v4l2_input *kp, struct v4l2_input32 __user *up)
576 {
577 	if (copy_from_user(kp, up, sizeof(struct v4l2_input32)))
578 		return -EFAULT;
579 	return 0;
580 }
581 
put_v4l2_input32(struct v4l2_input * kp,struct v4l2_input32 __user * up)582 static inline int put_v4l2_input32(struct v4l2_input *kp, struct v4l2_input32 __user *up)
583 {
584 	if (copy_to_user(up, kp, sizeof(struct v4l2_input32)))
585 		return -EFAULT;
586 	return 0;
587 }
588 
589 struct v4l2_ext_controls32 {
590        __u32 ctrl_class;
591        __u32 count;
592        __u32 error_idx;
593        __u32 reserved[2];
594        compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */
595 };
596 
597 struct v4l2_ext_control32 {
598 	__u32 id;
599 	__u32 size;
600 	__u32 reserved2[1];
601 	union {
602 		__s32 value;
603 		__s64 value64;
604 		compat_caddr_t string; /* actually char * */
605 	};
606 } __attribute__ ((packed));
607 
608 /* The following function really belong in v4l2-common, but that causes
609    a circular dependency between modules. We need to think about this, but
610    for now this will do. */
611 
612 /* Return non-zero if this control is a pointer type. Currently only
613    type STRING is a pointer type. */
ctrl_is_pointer(u32 id)614 static inline int ctrl_is_pointer(u32 id)
615 {
616 	switch (id) {
617 	case V4L2_CID_RDS_TX_PS_NAME:
618 	case V4L2_CID_RDS_TX_RADIO_TEXT:
619 		return 1;
620 	default:
621 		return 0;
622 	}
623 }
624 
get_v4l2_ext_controls32(struct v4l2_ext_controls * kp,struct v4l2_ext_controls32 __user * up)625 static int get_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext_controls32 __user *up)
626 {
627 	struct v4l2_ext_control32 __user *ucontrols;
628 	struct v4l2_ext_control __user *kcontrols;
629 	int n;
630 	compat_caddr_t p;
631 
632 	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_ext_controls32)) ||
633 		get_user(kp->ctrl_class, &up->ctrl_class) ||
634 		get_user(kp->count, &up->count) ||
635 		get_user(kp->error_idx, &up->error_idx) ||
636 		copy_from_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
637 			return -EFAULT;
638 	n = kp->count;
639 	if (n == 0) {
640 		kp->controls = NULL;
641 		return 0;
642 	}
643 	if (get_user(p, &up->controls))
644 		return -EFAULT;
645 	ucontrols = compat_ptr(p);
646 	if (!access_ok(VERIFY_READ, ucontrols,
647 			n * sizeof(struct v4l2_ext_control32)))
648 		return -EFAULT;
649 	kcontrols = compat_alloc_user_space(n * sizeof(struct v4l2_ext_control));
650 	kp->controls = kcontrols;
651 	while (--n >= 0) {
652 		if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols)))
653 			return -EFAULT;
654 		if (ctrl_is_pointer(kcontrols->id)) {
655 			void __user *s;
656 
657 			if (get_user(p, &ucontrols->string))
658 				return -EFAULT;
659 			s = compat_ptr(p);
660 			if (put_user(s, &kcontrols->string))
661 				return -EFAULT;
662 		}
663 		ucontrols++;
664 		kcontrols++;
665 	}
666 	return 0;
667 }
668 
put_v4l2_ext_controls32(struct v4l2_ext_controls * kp,struct v4l2_ext_controls32 __user * up)669 static int put_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext_controls32 __user *up)
670 {
671 	struct v4l2_ext_control32 __user *ucontrols;
672 	struct v4l2_ext_control __user *kcontrols = kp->controls;
673 	int n = kp->count;
674 	compat_caddr_t p;
675 
676 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_ext_controls32)) ||
677 		put_user(kp->ctrl_class, &up->ctrl_class) ||
678 		put_user(kp->count, &up->count) ||
679 		put_user(kp->error_idx, &up->error_idx) ||
680 		copy_to_user(up->reserved, kp->reserved, sizeof(up->reserved)))
681 			return -EFAULT;
682 	if (!kp->count)
683 		return 0;
684 
685 	if (get_user(p, &up->controls))
686 		return -EFAULT;
687 	ucontrols = compat_ptr(p);
688 	if (!access_ok(VERIFY_WRITE, ucontrols,
689 			n * sizeof(struct v4l2_ext_control32)))
690 		return -EFAULT;
691 
692 	while (--n >= 0) {
693 		unsigned size = sizeof(*ucontrols);
694 
695 		/* Do not modify the pointer when copying a pointer control.
696 		   The contents of the pointer was changed, not the pointer
697 		   itself. */
698 		if (ctrl_is_pointer(kcontrols->id))
699 			size -= sizeof(ucontrols->value64);
700 		if (copy_in_user(ucontrols, kcontrols, size))
701 			return -EFAULT;
702 		ucontrols++;
703 		kcontrols++;
704 	}
705 	return 0;
706 }
707 
708 struct v4l2_event32 {
709 	__u32				type;
710 	union {
711 		__u8			data[64];
712 	} u;
713 	__u32				pending;
714 	__u32				sequence;
715 	struct compat_timespec		timestamp;
716 	__u32				id;
717 	__u32				reserved[8];
718 };
719 
put_v4l2_event32(struct v4l2_event * kp,struct v4l2_event32 __user * up)720 static int put_v4l2_event32(struct v4l2_event *kp, struct v4l2_event32 __user *up)
721 {
722 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_event32)) ||
723 		put_user(kp->type, &up->type) ||
724 		copy_to_user(&up->u, &kp->u, sizeof(kp->u)) ||
725 		put_user(kp->pending, &up->pending) ||
726 		put_user(kp->sequence, &up->sequence) ||
727 		put_compat_timespec(&kp->timestamp, &up->timestamp) ||
728 		put_user(kp->id, &up->id) ||
729 		copy_to_user(up->reserved, kp->reserved, 8 * sizeof(__u32)))
730 			return -EFAULT;
731 	return 0;
732 }
733 
734 #define VIDIOC_G_FMT32		_IOWR('V',  4, struct v4l2_format32)
735 #define VIDIOC_S_FMT32		_IOWR('V',  5, struct v4l2_format32)
736 #define VIDIOC_QUERYBUF32	_IOWR('V',  9, struct v4l2_buffer32)
737 #define VIDIOC_G_FBUF32		_IOR ('V', 10, struct v4l2_framebuffer32)
738 #define VIDIOC_S_FBUF32		_IOW ('V', 11, struct v4l2_framebuffer32)
739 #define VIDIOC_QBUF32		_IOWR('V', 15, struct v4l2_buffer32)
740 #define VIDIOC_DQBUF32		_IOWR('V', 17, struct v4l2_buffer32)
741 #define VIDIOC_ENUMSTD32	_IOWR('V', 25, struct v4l2_standard32)
742 #define VIDIOC_ENUMINPUT32	_IOWR('V', 26, struct v4l2_input32)
743 #define VIDIOC_TRY_FMT32      	_IOWR('V', 64, struct v4l2_format32)
744 #define VIDIOC_G_EXT_CTRLS32    _IOWR('V', 71, struct v4l2_ext_controls32)
745 #define VIDIOC_S_EXT_CTRLS32    _IOWR('V', 72, struct v4l2_ext_controls32)
746 #define VIDIOC_TRY_EXT_CTRLS32  _IOWR('V', 73, struct v4l2_ext_controls32)
747 #define	VIDIOC_DQEVENT32	_IOR ('V', 89, struct v4l2_event32)
748 #define VIDIOC_CREATE_BUFS32	_IOWR('V', 92, struct v4l2_create_buffers32)
749 #define VIDIOC_PREPARE_BUF32	_IOWR('V', 93, struct v4l2_buffer32)
750 
751 #define VIDIOC_OVERLAY32	_IOW ('V', 14, s32)
752 #define VIDIOC_STREAMON32	_IOW ('V', 18, s32)
753 #define VIDIOC_STREAMOFF32	_IOW ('V', 19, s32)
754 #define VIDIOC_G_INPUT32	_IOR ('V', 38, s32)
755 #define VIDIOC_S_INPUT32	_IOWR('V', 39, s32)
756 #define VIDIOC_G_OUTPUT32	_IOR ('V', 46, s32)
757 #define VIDIOC_S_OUTPUT32	_IOWR('V', 47, s32)
758 
do_video_ioctl(struct file * file,unsigned int cmd,unsigned long arg)759 static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
760 {
761 	union {
762 		struct v4l2_format v2f;
763 		struct v4l2_buffer v2b;
764 		struct v4l2_framebuffer v2fb;
765 		struct v4l2_input v2i;
766 		struct v4l2_standard v2s;
767 		struct v4l2_ext_controls v2ecs;
768 		struct v4l2_event v2ev;
769 		struct v4l2_create_buffers v2crt;
770 		unsigned long vx;
771 		int vi;
772 	} karg;
773 	void __user *up = compat_ptr(arg);
774 	int compatible_arg = 1;
775 	long err = 0;
776 
777 	/* First, convert the command. */
778 	switch (cmd) {
779 	case VIDIOC_G_FMT32: cmd = VIDIOC_G_FMT; break;
780 	case VIDIOC_S_FMT32: cmd = VIDIOC_S_FMT; break;
781 	case VIDIOC_QUERYBUF32: cmd = VIDIOC_QUERYBUF; break;
782 	case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break;
783 	case VIDIOC_S_FBUF32: cmd = VIDIOC_S_FBUF; break;
784 	case VIDIOC_QBUF32: cmd = VIDIOC_QBUF; break;
785 	case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break;
786 	case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break;
787 	case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break;
788 	case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break;
789 	case VIDIOC_G_EXT_CTRLS32: cmd = VIDIOC_G_EXT_CTRLS; break;
790 	case VIDIOC_S_EXT_CTRLS32: cmd = VIDIOC_S_EXT_CTRLS; break;
791 	case VIDIOC_TRY_EXT_CTRLS32: cmd = VIDIOC_TRY_EXT_CTRLS; break;
792 	case VIDIOC_DQEVENT32: cmd = VIDIOC_DQEVENT; break;
793 	case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break;
794 	case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break;
795 	case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break;
796 	case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break;
797 	case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break;
798 	case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break;
799 	case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break;
800 	case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break;
801 	case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break;
802 	}
803 
804 	switch (cmd) {
805 	case VIDIOC_OVERLAY:
806 	case VIDIOC_STREAMON:
807 	case VIDIOC_STREAMOFF:
808 	case VIDIOC_S_INPUT:
809 	case VIDIOC_S_OUTPUT:
810 		err = get_user(karg.vi, (s32 __user *)up);
811 		compatible_arg = 0;
812 		break;
813 
814 	case VIDIOC_G_INPUT:
815 	case VIDIOC_G_OUTPUT:
816 		compatible_arg = 0;
817 		break;
818 
819 	case VIDIOC_G_FMT:
820 	case VIDIOC_S_FMT:
821 	case VIDIOC_TRY_FMT:
822 		err = get_v4l2_format32(&karg.v2f, up);
823 		compatible_arg = 0;
824 		break;
825 
826 	case VIDIOC_CREATE_BUFS:
827 		err = get_v4l2_create32(&karg.v2crt, up);
828 		compatible_arg = 0;
829 		break;
830 
831 	case VIDIOC_PREPARE_BUF:
832 	case VIDIOC_QUERYBUF:
833 	case VIDIOC_QBUF:
834 	case VIDIOC_DQBUF:
835 		err = get_v4l2_buffer32(&karg.v2b, up);
836 		compatible_arg = 0;
837 		break;
838 
839 	case VIDIOC_S_FBUF:
840 		err = get_v4l2_framebuffer32(&karg.v2fb, up);
841 		compatible_arg = 0;
842 		break;
843 
844 	case VIDIOC_G_FBUF:
845 		compatible_arg = 0;
846 		break;
847 
848 	case VIDIOC_ENUMSTD:
849 		err = get_v4l2_standard32(&karg.v2s, up);
850 		compatible_arg = 0;
851 		break;
852 
853 	case VIDIOC_ENUMINPUT:
854 		err = get_v4l2_input32(&karg.v2i, up);
855 		compatible_arg = 0;
856 		break;
857 
858 	case VIDIOC_G_EXT_CTRLS:
859 	case VIDIOC_S_EXT_CTRLS:
860 	case VIDIOC_TRY_EXT_CTRLS:
861 		err = get_v4l2_ext_controls32(&karg.v2ecs, up);
862 		compatible_arg = 0;
863 		break;
864 	case VIDIOC_DQEVENT:
865 		compatible_arg = 0;
866 		break;
867 	}
868 	if (err)
869 		return err;
870 
871 	if (compatible_arg)
872 		err = native_ioctl(file, cmd, (unsigned long)up);
873 	else {
874 		mm_segment_t old_fs = get_fs();
875 
876 		set_fs(KERNEL_DS);
877 		err = native_ioctl(file, cmd, (unsigned long)&karg);
878 		set_fs(old_fs);
879 	}
880 
881 	/* Special case: even after an error we need to put the
882 	   results back for these ioctls since the error_idx will
883 	   contain information on which control failed. */
884 	switch (cmd) {
885 	case VIDIOC_G_EXT_CTRLS:
886 	case VIDIOC_S_EXT_CTRLS:
887 	case VIDIOC_TRY_EXT_CTRLS:
888 		if (put_v4l2_ext_controls32(&karg.v2ecs, up))
889 			err = -EFAULT;
890 		break;
891 	}
892 	if (err)
893 		return err;
894 
895 	switch (cmd) {
896 	case VIDIOC_S_INPUT:
897 	case VIDIOC_S_OUTPUT:
898 	case VIDIOC_G_INPUT:
899 	case VIDIOC_G_OUTPUT:
900 		err = put_user(((s32)karg.vi), (s32 __user *)up);
901 		break;
902 
903 	case VIDIOC_G_FBUF:
904 		err = put_v4l2_framebuffer32(&karg.v2fb, up);
905 		break;
906 
907 	case VIDIOC_DQEVENT:
908 		err = put_v4l2_event32(&karg.v2ev, up);
909 		break;
910 
911 	case VIDIOC_G_FMT:
912 	case VIDIOC_S_FMT:
913 	case VIDIOC_TRY_FMT:
914 		err = put_v4l2_format32(&karg.v2f, up);
915 		break;
916 
917 	case VIDIOC_CREATE_BUFS:
918 		err = put_v4l2_create32(&karg.v2crt, up);
919 		break;
920 
921 	case VIDIOC_QUERYBUF:
922 	case VIDIOC_QBUF:
923 	case VIDIOC_DQBUF:
924 		err = put_v4l2_buffer32(&karg.v2b, up);
925 		break;
926 
927 	case VIDIOC_ENUMSTD:
928 		err = put_v4l2_standard32(&karg.v2s, up);
929 		break;
930 
931 	case VIDIOC_ENUMINPUT:
932 		err = put_v4l2_input32(&karg.v2i, up);
933 		break;
934 	}
935 	return err;
936 }
937 
v4l2_compat_ioctl32(struct file * file,unsigned int cmd,unsigned long arg)938 long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)
939 {
940 	long ret = -ENOIOCTLCMD;
941 
942 	if (!file->f_op->unlocked_ioctl)
943 		return ret;
944 
945 	switch (cmd) {
946 	case VIDIOC_QUERYCAP:
947 	case VIDIOC_RESERVED:
948 	case VIDIOC_ENUM_FMT:
949 	case VIDIOC_G_FMT32:
950 	case VIDIOC_S_FMT32:
951 	case VIDIOC_REQBUFS:
952 	case VIDIOC_QUERYBUF32:
953 	case VIDIOC_G_FBUF32:
954 	case VIDIOC_S_FBUF32:
955 	case VIDIOC_OVERLAY32:
956 	case VIDIOC_QBUF32:
957 	case VIDIOC_DQBUF32:
958 	case VIDIOC_STREAMON32:
959 	case VIDIOC_STREAMOFF32:
960 	case VIDIOC_G_PARM:
961 	case VIDIOC_S_PARM:
962 	case VIDIOC_G_STD:
963 	case VIDIOC_S_STD:
964 	case VIDIOC_ENUMSTD32:
965 	case VIDIOC_ENUMINPUT32:
966 	case VIDIOC_G_CTRL:
967 	case VIDIOC_S_CTRL:
968 	case VIDIOC_G_TUNER:
969 	case VIDIOC_S_TUNER:
970 	case VIDIOC_G_AUDIO:
971 	case VIDIOC_S_AUDIO:
972 	case VIDIOC_QUERYCTRL:
973 	case VIDIOC_QUERYMENU:
974 	case VIDIOC_G_INPUT32:
975 	case VIDIOC_S_INPUT32:
976 	case VIDIOC_G_OUTPUT32:
977 	case VIDIOC_S_OUTPUT32:
978 	case VIDIOC_ENUMOUTPUT:
979 	case VIDIOC_G_AUDOUT:
980 	case VIDIOC_S_AUDOUT:
981 	case VIDIOC_G_MODULATOR:
982 	case VIDIOC_S_MODULATOR:
983 	case VIDIOC_S_FREQUENCY:
984 	case VIDIOC_G_FREQUENCY:
985 	case VIDIOC_CROPCAP:
986 	case VIDIOC_G_CROP:
987 	case VIDIOC_S_CROP:
988 	case VIDIOC_G_SELECTION:
989 	case VIDIOC_S_SELECTION:
990 	case VIDIOC_G_JPEGCOMP:
991 	case VIDIOC_S_JPEGCOMP:
992 	case VIDIOC_QUERYSTD:
993 	case VIDIOC_TRY_FMT32:
994 	case VIDIOC_ENUMAUDIO:
995 	case VIDIOC_ENUMAUDOUT:
996 	case VIDIOC_G_PRIORITY:
997 	case VIDIOC_S_PRIORITY:
998 	case VIDIOC_G_SLICED_VBI_CAP:
999 	case VIDIOC_LOG_STATUS:
1000 	case VIDIOC_G_EXT_CTRLS32:
1001 	case VIDIOC_S_EXT_CTRLS32:
1002 	case VIDIOC_TRY_EXT_CTRLS32:
1003 	case VIDIOC_ENUM_FRAMESIZES:
1004 	case VIDIOC_ENUM_FRAMEINTERVALS:
1005 	case VIDIOC_G_ENC_INDEX:
1006 	case VIDIOC_ENCODER_CMD:
1007 	case VIDIOC_TRY_ENCODER_CMD:
1008 	case VIDIOC_DBG_S_REGISTER:
1009 	case VIDIOC_DBG_G_REGISTER:
1010 	case VIDIOC_DBG_G_CHIP_IDENT:
1011 	case VIDIOC_S_HW_FREQ_SEEK:
1012 	case VIDIOC_ENUM_DV_PRESETS:
1013 	case VIDIOC_S_DV_PRESET:
1014 	case VIDIOC_G_DV_PRESET:
1015 	case VIDIOC_QUERY_DV_PRESET:
1016 	case VIDIOC_S_DV_TIMINGS:
1017 	case VIDIOC_G_DV_TIMINGS:
1018 	case VIDIOC_DQEVENT:
1019 	case VIDIOC_DQEVENT32:
1020 	case VIDIOC_SUBSCRIBE_EVENT:
1021 	case VIDIOC_UNSUBSCRIBE_EVENT:
1022 	case VIDIOC_CREATE_BUFS32:
1023 	case VIDIOC_PREPARE_BUF32:
1024 		ret = do_video_ioctl(file, cmd, arg);
1025 		break;
1026 
1027 	default:
1028 		printk(KERN_WARNING "compat_ioctl32: "
1029 			"unknown ioctl '%c', dir=%d, #%d (0x%08x)\n",
1030 			_IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd);
1031 		break;
1032 	}
1033 	return ret;
1034 }
1035 EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32);
1036 #endif
1037 
1038 MODULE_LICENSE("GPL");
1039