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