1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ioctl32.c: Conversion between 32bit and 64bit native ioctls. 4 * Separated from fs stuff by Arnd Bergmann <arnd@arndb.de> 5 * 6 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com) 7 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) 8 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs 9 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz) 10 * Copyright (C) 2005 Philippe De Muyter (phdm@macqel.be) 11 * Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> 12 * 13 * These routines maintain argument size conversion between 32bit and 64bit 14 * ioctls. 15 */ 16 17 #include <linux/compat.h> 18 #include <linux/module.h> 19 #include <linux/videodev2.h> 20 #include <linux/v4l2-subdev.h> 21 #include <media/v4l2-dev.h> 22 #include <media/v4l2-fh.h> 23 #include <media/v4l2-ctrls.h> 24 #include <media/v4l2-ioctl.h> 25 26 /** 27 * assign_in_user() - Copy from one __user var to another one 28 * 29 * @to: __user var where data will be stored 30 * @from: __user var where data will be retrieved. 31 * 32 * As this code very often needs to allocate userspace memory, it is easier 33 * to have a macro that will do both get_user() and put_user() at once. 34 * 35 * This function complements the macros defined at asm-generic/uaccess.h. 36 * It uses the same argument order as copy_in_user() 37 */ 38 #define assign_in_user(to, from) \ 39 ({ \ 40 typeof(*from) __assign_tmp; \ 41 \ 42 get_user(__assign_tmp, from) || put_user(__assign_tmp, to); \ 43 }) 44 45 /** 46 * get_user_cast() - Stores at a kernelspace local var the contents from a 47 * pointer with userspace data that is not tagged with __user. 48 * 49 * @__x: var where data will be stored 50 * @__ptr: var where data will be retrieved. 51 * 52 * Sometimes we need to declare a pointer without __user because it 53 * comes from a pointer struct field that will be retrieved from userspace 54 * by the 64-bit native ioctl handler. This function ensures that the 55 * @__ptr will be cast to __user before calling get_user() in order to 56 * avoid warnings with static code analyzers like smatch. 57 */ 58 #define get_user_cast(__x, __ptr) \ 59 ({ \ 60 get_user(__x, (typeof(*__ptr) __user *)(__ptr)); \ 61 }) 62 63 /** 64 * put_user_force() - Stores the contents of a kernelspace local var 65 * into a userspace pointer, removing any __user cast. 66 * 67 * @__x: var where data will be stored 68 * @__ptr: var where data will be retrieved. 69 * 70 * Sometimes we need to remove the __user attribute from some data, 71 * by passing the __force macro. This function ensures that the 72 * @__ptr will be cast with __force before calling put_user(), in order to 73 * avoid warnings with static code analyzers like smatch. 74 */ 75 #define put_user_force(__x, __ptr) \ 76 ({ \ 77 put_user((typeof(*__x) __force *)(__x), __ptr); \ 78 }) 79 80 /** 81 * assign_in_user_cast() - Copy from one __user var to another one 82 * 83 * @to: __user var where data will be stored 84 * @from: var where data will be retrieved that needs to be cast to __user. 85 * 86 * As this code very often needs to allocate userspace memory, it is easier 87 * to have a macro that will do both get_user_cast() and put_user() at once. 88 * 89 * This function should be used instead of assign_in_user() when the @from 90 * variable was not declared as __user. See get_user_cast() for more details. 91 * 92 * This function complements the macros defined at asm-generic/uaccess.h. 93 * It uses the same argument order as copy_in_user() 94 */ 95 #define assign_in_user_cast(to, from) \ 96 ({ \ 97 typeof(*from) __assign_tmp; \ 98 \ 99 get_user_cast(__assign_tmp, from) || put_user(__assign_tmp, to);\ 100 }) 101 102 /** 103 * native_ioctl - Ancillary function that calls the native 64 bits ioctl 104 * handler. 105 * 106 * @file: pointer to &struct file with the file handler 107 * @cmd: ioctl to be called 108 * @arg: arguments passed from/to the ioctl handler 109 * 110 * This function calls the native ioctl handler at v4l2-dev, e. g. v4l2_ioctl() 111 */ 112 static long native_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 113 { 114 long ret = -ENOIOCTLCMD; 115 116 if (file->f_op->unlocked_ioctl) 117 ret = file->f_op->unlocked_ioctl(file, cmd, arg); 118 119 return ret; 120 } 121 122 123 /* 124 * Per-ioctl data copy handlers. 125 * 126 * Those come in pairs, with a get_v4l2_foo() and a put_v4l2_foo() routine, 127 * where "v4l2_foo" is the name of the V4L2 struct. 128 * 129 * They basically get two __user pointers, one with a 32-bits struct that 130 * came from the userspace call and a 64-bits struct, also allocated as 131 * userspace, but filled internally by do_video_ioctl(). 132 * 133 * For ioctls that have pointers inside it, the functions will also 134 * receive an ancillary buffer with extra space, used to pass extra 135 * data to the routine. 136 */ 137 138 struct v4l2_clip32 { 139 struct v4l2_rect c; 140 compat_caddr_t next; 141 }; 142 143 struct v4l2_window32 { 144 struct v4l2_rect w; 145 __u32 field; /* enum v4l2_field */ 146 __u32 chromakey; 147 compat_caddr_t clips; /* actually struct v4l2_clip32 * */ 148 __u32 clipcount; 149 compat_caddr_t bitmap; 150 __u8 global_alpha; 151 }; 152 153 static int get_v4l2_window32(struct v4l2_window __user *p64, 154 struct v4l2_window32 __user *p32, 155 void __user *aux_buf, u32 aux_space) 156 { 157 struct v4l2_clip32 __user *uclips; 158 struct v4l2_clip __user *kclips; 159 compat_caddr_t p; 160 u32 clipcount; 161 162 if (!access_ok(p32, sizeof(*p32)) || 163 copy_in_user(&p64->w, &p32->w, sizeof(p32->w)) || 164 assign_in_user(&p64->field, &p32->field) || 165 assign_in_user(&p64->chromakey, &p32->chromakey) || 166 assign_in_user(&p64->global_alpha, &p32->global_alpha) || 167 get_user(clipcount, &p32->clipcount) || 168 put_user(clipcount, &p64->clipcount)) 169 return -EFAULT; 170 if (clipcount > 2048) 171 return -EINVAL; 172 if (!clipcount) 173 return put_user(NULL, &p64->clips); 174 175 if (get_user(p, &p32->clips)) 176 return -EFAULT; 177 uclips = compat_ptr(p); 178 if (aux_space < clipcount * sizeof(*kclips)) 179 return -EFAULT; 180 kclips = aux_buf; 181 if (put_user(kclips, &p64->clips)) 182 return -EFAULT; 183 184 while (clipcount--) { 185 if (copy_in_user(&kclips->c, &uclips->c, sizeof(uclips->c))) 186 return -EFAULT; 187 if (put_user(clipcount ? kclips + 1 : NULL, &kclips->next)) 188 return -EFAULT; 189 uclips++; 190 kclips++; 191 } 192 return 0; 193 } 194 195 static int put_v4l2_window32(struct v4l2_window __user *p64, 196 struct v4l2_window32 __user *p32) 197 { 198 struct v4l2_clip __user *kclips; 199 struct v4l2_clip32 __user *uclips; 200 compat_caddr_t p; 201 u32 clipcount; 202 203 if (copy_in_user(&p32->w, &p64->w, sizeof(p64->w)) || 204 assign_in_user(&p32->field, &p64->field) || 205 assign_in_user(&p32->chromakey, &p64->chromakey) || 206 assign_in_user(&p32->global_alpha, &p64->global_alpha) || 207 get_user(clipcount, &p64->clipcount) || 208 put_user(clipcount, &p32->clipcount)) 209 return -EFAULT; 210 if (!clipcount) 211 return 0; 212 213 if (get_user(kclips, &p64->clips)) 214 return -EFAULT; 215 if (get_user(p, &p32->clips)) 216 return -EFAULT; 217 uclips = compat_ptr(p); 218 while (clipcount--) { 219 if (copy_in_user(&uclips->c, &kclips->c, sizeof(uclips->c))) 220 return -EFAULT; 221 uclips++; 222 kclips++; 223 } 224 return 0; 225 } 226 227 struct v4l2_format32 { 228 __u32 type; /* enum v4l2_buf_type */ 229 union { 230 struct v4l2_pix_format pix; 231 struct v4l2_pix_format_mplane pix_mp; 232 struct v4l2_window32 win; 233 struct v4l2_vbi_format vbi; 234 struct v4l2_sliced_vbi_format sliced; 235 struct v4l2_sdr_format sdr; 236 struct v4l2_meta_format meta; 237 __u8 raw_data[200]; /* user-defined */ 238 } fmt; 239 }; 240 241 /** 242 * struct v4l2_create_buffers32 - VIDIOC_CREATE_BUFS32 argument 243 * @index: on return, index of the first created buffer 244 * @count: entry: number of requested buffers, 245 * return: number of created buffers 246 * @memory: buffer memory type 247 * @format: frame format, for which buffers are requested 248 * @capabilities: capabilities of this buffer type. 249 * @reserved: future extensions 250 */ 251 struct v4l2_create_buffers32 { 252 __u32 index; 253 __u32 count; 254 __u32 memory; /* enum v4l2_memory */ 255 struct v4l2_format32 format; 256 __u32 capabilities; 257 __u32 reserved[7]; 258 }; 259 260 static int __bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size) 261 { 262 u32 type; 263 264 if (get_user(type, &p32->type)) 265 return -EFAULT; 266 267 switch (type) { 268 case V4L2_BUF_TYPE_VIDEO_OVERLAY: 269 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: { 270 u32 clipcount; 271 272 if (get_user(clipcount, &p32->fmt.win.clipcount)) 273 return -EFAULT; 274 if (clipcount > 2048) 275 return -EINVAL; 276 *size = clipcount * sizeof(struct v4l2_clip); 277 return 0; 278 } 279 default: 280 *size = 0; 281 return 0; 282 } 283 } 284 285 static int bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size) 286 { 287 if (!access_ok(p32, sizeof(*p32))) 288 return -EFAULT; 289 return __bufsize_v4l2_format(p32, size); 290 } 291 292 static int __get_v4l2_format32(struct v4l2_format __user *p64, 293 struct v4l2_format32 __user *p32, 294 void __user *aux_buf, u32 aux_space) 295 { 296 u32 type; 297 298 if (get_user(type, &p32->type) || put_user(type, &p64->type)) 299 return -EFAULT; 300 301 switch (type) { 302 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 303 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 304 return copy_in_user(&p64->fmt.pix, &p32->fmt.pix, 305 sizeof(p64->fmt.pix)) ? -EFAULT : 0; 306 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE: 307 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: 308 return copy_in_user(&p64->fmt.pix_mp, &p32->fmt.pix_mp, 309 sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0; 310 case V4L2_BUF_TYPE_VIDEO_OVERLAY: 311 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: 312 return get_v4l2_window32(&p64->fmt.win, &p32->fmt.win, 313 aux_buf, aux_space); 314 case V4L2_BUF_TYPE_VBI_CAPTURE: 315 case V4L2_BUF_TYPE_VBI_OUTPUT: 316 return copy_in_user(&p64->fmt.vbi, &p32->fmt.vbi, 317 sizeof(p64->fmt.vbi)) ? -EFAULT : 0; 318 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: 319 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: 320 return copy_in_user(&p64->fmt.sliced, &p32->fmt.sliced, 321 sizeof(p64->fmt.sliced)) ? -EFAULT : 0; 322 case V4L2_BUF_TYPE_SDR_CAPTURE: 323 case V4L2_BUF_TYPE_SDR_OUTPUT: 324 return copy_in_user(&p64->fmt.sdr, &p32->fmt.sdr, 325 sizeof(p64->fmt.sdr)) ? -EFAULT : 0; 326 case V4L2_BUF_TYPE_META_CAPTURE: 327 case V4L2_BUF_TYPE_META_OUTPUT: 328 return copy_in_user(&p64->fmt.meta, &p32->fmt.meta, 329 sizeof(p64->fmt.meta)) ? -EFAULT : 0; 330 default: 331 return -EINVAL; 332 } 333 } 334 335 static int get_v4l2_format32(struct v4l2_format __user *p64, 336 struct v4l2_format32 __user *p32, 337 void __user *aux_buf, u32 aux_space) 338 { 339 if (!access_ok(p32, sizeof(*p32))) 340 return -EFAULT; 341 return __get_v4l2_format32(p64, p32, aux_buf, aux_space); 342 } 343 344 static int bufsize_v4l2_create(struct v4l2_create_buffers32 __user *p32, 345 u32 *size) 346 { 347 if (!access_ok(p32, sizeof(*p32))) 348 return -EFAULT; 349 return __bufsize_v4l2_format(&p32->format, size); 350 } 351 352 static int get_v4l2_create32(struct v4l2_create_buffers __user *p64, 353 struct v4l2_create_buffers32 __user *p32, 354 void __user *aux_buf, u32 aux_space) 355 { 356 if (!access_ok(p32, sizeof(*p32)) || 357 copy_in_user(p64, p32, 358 offsetof(struct v4l2_create_buffers32, format))) 359 return -EFAULT; 360 return __get_v4l2_format32(&p64->format, &p32->format, 361 aux_buf, aux_space); 362 } 363 364 static int __put_v4l2_format32(struct v4l2_format __user *p64, 365 struct v4l2_format32 __user *p32) 366 { 367 u32 type; 368 369 if (get_user(type, &p64->type)) 370 return -EFAULT; 371 372 switch (type) { 373 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 374 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 375 return copy_in_user(&p32->fmt.pix, &p64->fmt.pix, 376 sizeof(p64->fmt.pix)) ? -EFAULT : 0; 377 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE: 378 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: 379 return copy_in_user(&p32->fmt.pix_mp, &p64->fmt.pix_mp, 380 sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0; 381 case V4L2_BUF_TYPE_VIDEO_OVERLAY: 382 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: 383 return put_v4l2_window32(&p64->fmt.win, &p32->fmt.win); 384 case V4L2_BUF_TYPE_VBI_CAPTURE: 385 case V4L2_BUF_TYPE_VBI_OUTPUT: 386 return copy_in_user(&p32->fmt.vbi, &p64->fmt.vbi, 387 sizeof(p64->fmt.vbi)) ? -EFAULT : 0; 388 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: 389 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: 390 return copy_in_user(&p32->fmt.sliced, &p64->fmt.sliced, 391 sizeof(p64->fmt.sliced)) ? -EFAULT : 0; 392 case V4L2_BUF_TYPE_SDR_CAPTURE: 393 case V4L2_BUF_TYPE_SDR_OUTPUT: 394 return copy_in_user(&p32->fmt.sdr, &p64->fmt.sdr, 395 sizeof(p64->fmt.sdr)) ? -EFAULT : 0; 396 case V4L2_BUF_TYPE_META_CAPTURE: 397 case V4L2_BUF_TYPE_META_OUTPUT: 398 return copy_in_user(&p32->fmt.meta, &p64->fmt.meta, 399 sizeof(p64->fmt.meta)) ? -EFAULT : 0; 400 default: 401 return -EINVAL; 402 } 403 } 404 405 static int put_v4l2_format32(struct v4l2_format __user *p64, 406 struct v4l2_format32 __user *p32) 407 { 408 if (!access_ok(p32, sizeof(*p32))) 409 return -EFAULT; 410 return __put_v4l2_format32(p64, p32); 411 } 412 413 static int put_v4l2_create32(struct v4l2_create_buffers __user *p64, 414 struct v4l2_create_buffers32 __user *p32) 415 { 416 if (!access_ok(p32, sizeof(*p32)) || 417 copy_in_user(p32, p64, 418 offsetof(struct v4l2_create_buffers32, format)) || 419 assign_in_user(&p32->capabilities, &p64->capabilities) || 420 copy_in_user(p32->reserved, p64->reserved, sizeof(p64->reserved))) 421 return -EFAULT; 422 return __put_v4l2_format32(&p64->format, &p32->format); 423 } 424 425 struct v4l2_standard32 { 426 __u32 index; 427 compat_u64 id; 428 __u8 name[24]; 429 struct v4l2_fract frameperiod; /* Frames, not fields */ 430 __u32 framelines; 431 __u32 reserved[4]; 432 }; 433 434 static int get_v4l2_standard32(struct v4l2_standard __user *p64, 435 struct v4l2_standard32 __user *p32) 436 { 437 /* other fields are not set by the user, nor used by the driver */ 438 if (!access_ok(p32, sizeof(*p32)) || 439 assign_in_user(&p64->index, &p32->index)) 440 return -EFAULT; 441 return 0; 442 } 443 444 static int put_v4l2_standard32(struct v4l2_standard __user *p64, 445 struct v4l2_standard32 __user *p32) 446 { 447 if (!access_ok(p32, sizeof(*p32)) || 448 assign_in_user(&p32->index, &p64->index) || 449 assign_in_user(&p32->id, &p64->id) || 450 copy_in_user(p32->name, p64->name, sizeof(p32->name)) || 451 copy_in_user(&p32->frameperiod, &p64->frameperiod, 452 sizeof(p32->frameperiod)) || 453 assign_in_user(&p32->framelines, &p64->framelines) || 454 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 455 return -EFAULT; 456 return 0; 457 } 458 459 struct v4l2_plane32 { 460 __u32 bytesused; 461 __u32 length; 462 union { 463 __u32 mem_offset; 464 compat_long_t userptr; 465 __s32 fd; 466 } m; 467 __u32 data_offset; 468 __u32 reserved[11]; 469 }; 470 471 /* 472 * This is correct for all architectures including i386, but not x32, 473 * which has different alignment requirements for timestamp 474 */ 475 struct v4l2_buffer32 { 476 __u32 index; 477 __u32 type; /* enum v4l2_buf_type */ 478 __u32 bytesused; 479 __u32 flags; 480 __u32 field; /* enum v4l2_field */ 481 struct { 482 compat_s64 tv_sec; 483 compat_s64 tv_usec; 484 } timestamp; 485 struct v4l2_timecode timecode; 486 __u32 sequence; 487 488 /* memory location */ 489 __u32 memory; /* enum v4l2_memory */ 490 union { 491 __u32 offset; 492 compat_long_t userptr; 493 compat_caddr_t planes; 494 __s32 fd; 495 } m; 496 __u32 length; 497 __u32 reserved2; 498 __s32 request_fd; 499 }; 500 501 struct v4l2_buffer32_time32 { 502 __u32 index; 503 __u32 type; /* enum v4l2_buf_type */ 504 __u32 bytesused; 505 __u32 flags; 506 __u32 field; /* enum v4l2_field */ 507 struct old_timeval32 timestamp; 508 struct v4l2_timecode timecode; 509 __u32 sequence; 510 511 /* memory location */ 512 __u32 memory; /* enum v4l2_memory */ 513 union { 514 __u32 offset; 515 compat_long_t userptr; 516 compat_caddr_t planes; 517 __s32 fd; 518 } m; 519 __u32 length; 520 __u32 reserved2; 521 __s32 request_fd; 522 }; 523 524 static int get_v4l2_plane32(struct v4l2_plane __user *p64, 525 struct v4l2_plane32 __user *p32, 526 enum v4l2_memory memory) 527 { 528 compat_ulong_t p; 529 530 if (copy_in_user(p64, p32, 2 * sizeof(__u32)) || 531 copy_in_user(&p64->data_offset, &p32->data_offset, 532 sizeof(p64->data_offset))) 533 return -EFAULT; 534 535 switch (memory) { 536 case V4L2_MEMORY_MMAP: 537 case V4L2_MEMORY_OVERLAY: 538 if (copy_in_user(&p64->m.mem_offset, &p32->m.mem_offset, 539 sizeof(p32->m.mem_offset))) 540 return -EFAULT; 541 break; 542 case V4L2_MEMORY_USERPTR: 543 if (get_user(p, &p32->m.userptr) || 544 put_user((unsigned long)compat_ptr(p), &p64->m.userptr)) 545 return -EFAULT; 546 break; 547 case V4L2_MEMORY_DMABUF: 548 if (copy_in_user(&p64->m.fd, &p32->m.fd, sizeof(p32->m.fd))) 549 return -EFAULT; 550 break; 551 } 552 553 return 0; 554 } 555 556 static int put_v4l2_plane32(struct v4l2_plane __user *p64, 557 struct v4l2_plane32 __user *p32, 558 enum v4l2_memory memory) 559 { 560 unsigned long p; 561 562 if (copy_in_user(p32, p64, 2 * sizeof(__u32)) || 563 copy_in_user(&p32->data_offset, &p64->data_offset, 564 sizeof(p64->data_offset))) 565 return -EFAULT; 566 567 switch (memory) { 568 case V4L2_MEMORY_MMAP: 569 case V4L2_MEMORY_OVERLAY: 570 if (copy_in_user(&p32->m.mem_offset, &p64->m.mem_offset, 571 sizeof(p64->m.mem_offset))) 572 return -EFAULT; 573 break; 574 case V4L2_MEMORY_USERPTR: 575 if (get_user(p, &p64->m.userptr) || 576 put_user((compat_ulong_t)ptr_to_compat((void __user *)p), 577 &p32->m.userptr)) 578 return -EFAULT; 579 break; 580 case V4L2_MEMORY_DMABUF: 581 if (copy_in_user(&p32->m.fd, &p64->m.fd, sizeof(p64->m.fd))) 582 return -EFAULT; 583 break; 584 } 585 586 return 0; 587 } 588 589 static int bufsize_v4l2_buffer(struct v4l2_buffer32 __user *p32, u32 *size) 590 { 591 u32 type; 592 u32 length; 593 594 if (!access_ok(p32, sizeof(*p32)) || 595 get_user(type, &p32->type) || 596 get_user(length, &p32->length)) 597 return -EFAULT; 598 599 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 600 if (length > VIDEO_MAX_PLANES) 601 return -EINVAL; 602 603 /* 604 * We don't really care if userspace decides to kill itself 605 * by passing a very big length value 606 */ 607 *size = length * sizeof(struct v4l2_plane); 608 } else { 609 *size = 0; 610 } 611 return 0; 612 } 613 614 static int bufsize_v4l2_buffer_time32(struct v4l2_buffer32_time32 __user *p32, u32 *size) 615 { 616 u32 type; 617 u32 length; 618 619 if (!access_ok(p32, sizeof(*p32)) || 620 get_user(type, &p32->type) || 621 get_user(length, &p32->length)) 622 return -EFAULT; 623 624 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 625 if (length > VIDEO_MAX_PLANES) 626 return -EINVAL; 627 628 /* 629 * We don't really care if userspace decides to kill itself 630 * by passing a very big length value 631 */ 632 *size = length * sizeof(struct v4l2_plane); 633 } else { 634 *size = 0; 635 } 636 return 0; 637 } 638 639 static int get_v4l2_buffer32(struct v4l2_buffer __user *p64, 640 struct v4l2_buffer32 __user *p32, 641 void __user *aux_buf, u32 aux_space) 642 { 643 u32 type; 644 u32 length; 645 s32 request_fd; 646 enum v4l2_memory memory; 647 struct v4l2_plane32 __user *uplane32; 648 struct v4l2_plane __user *uplane; 649 compat_caddr_t p; 650 int ret; 651 652 if (!access_ok(p32, sizeof(*p32)) || 653 assign_in_user(&p64->index, &p32->index) || 654 get_user(type, &p32->type) || 655 put_user(type, &p64->type) || 656 assign_in_user(&p64->flags, &p32->flags) || 657 get_user(memory, &p32->memory) || 658 put_user(memory, &p64->memory) || 659 get_user(length, &p32->length) || 660 put_user(length, &p64->length) || 661 get_user(request_fd, &p32->request_fd) || 662 put_user(request_fd, &p64->request_fd)) 663 return -EFAULT; 664 665 if (V4L2_TYPE_IS_OUTPUT(type)) 666 if (assign_in_user(&p64->bytesused, &p32->bytesused) || 667 assign_in_user(&p64->field, &p32->field) || 668 assign_in_user(&p64->timestamp.tv_sec, 669 &p32->timestamp.tv_sec) || 670 assign_in_user(&p64->timestamp.tv_usec, 671 &p32->timestamp.tv_usec)) 672 return -EFAULT; 673 674 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 675 u32 num_planes = length; 676 677 if (num_planes == 0) { 678 /* 679 * num_planes == 0 is legal, e.g. when userspace doesn't 680 * need planes array on DQBUF 681 */ 682 return put_user(NULL, &p64->m.planes); 683 } 684 if (num_planes > VIDEO_MAX_PLANES) 685 return -EINVAL; 686 687 if (get_user(p, &p32->m.planes)) 688 return -EFAULT; 689 690 uplane32 = compat_ptr(p); 691 if (!access_ok(uplane32, 692 num_planes * sizeof(*uplane32))) 693 return -EFAULT; 694 695 /* 696 * We don't really care if userspace decides to kill itself 697 * by passing a very big num_planes value 698 */ 699 if (aux_space < num_planes * sizeof(*uplane)) 700 return -EFAULT; 701 702 uplane = aux_buf; 703 if (put_user_force(uplane, &p64->m.planes)) 704 return -EFAULT; 705 706 while (num_planes--) { 707 ret = get_v4l2_plane32(uplane, uplane32, memory); 708 if (ret) 709 return ret; 710 uplane++; 711 uplane32++; 712 } 713 } else { 714 switch (memory) { 715 case V4L2_MEMORY_MMAP: 716 case V4L2_MEMORY_OVERLAY: 717 if (assign_in_user(&p64->m.offset, &p32->m.offset)) 718 return -EFAULT; 719 break; 720 case V4L2_MEMORY_USERPTR: { 721 compat_ulong_t userptr; 722 723 if (get_user(userptr, &p32->m.userptr) || 724 put_user((unsigned long)compat_ptr(userptr), 725 &p64->m.userptr)) 726 return -EFAULT; 727 break; 728 } 729 case V4L2_MEMORY_DMABUF: 730 if (assign_in_user(&p64->m.fd, &p32->m.fd)) 731 return -EFAULT; 732 break; 733 } 734 } 735 736 return 0; 737 } 738 739 static int get_v4l2_buffer32_time32(struct v4l2_buffer_time32 __user *p64, 740 struct v4l2_buffer32_time32 __user *p32, 741 void __user *aux_buf, u32 aux_space) 742 { 743 u32 type; 744 u32 length; 745 s32 request_fd; 746 enum v4l2_memory memory; 747 struct v4l2_plane32 __user *uplane32; 748 struct v4l2_plane __user *uplane; 749 compat_caddr_t p; 750 int ret; 751 752 if (!access_ok(p32, sizeof(*p32)) || 753 assign_in_user(&p64->index, &p32->index) || 754 get_user(type, &p32->type) || 755 put_user(type, &p64->type) || 756 assign_in_user(&p64->flags, &p32->flags) || 757 get_user(memory, &p32->memory) || 758 put_user(memory, &p64->memory) || 759 get_user(length, &p32->length) || 760 put_user(length, &p64->length) || 761 get_user(request_fd, &p32->request_fd) || 762 put_user(request_fd, &p64->request_fd)) 763 return -EFAULT; 764 765 if (V4L2_TYPE_IS_OUTPUT(type)) 766 if (assign_in_user(&p64->bytesused, &p32->bytesused) || 767 assign_in_user(&p64->field, &p32->field) || 768 assign_in_user(&p64->timestamp.tv_sec, 769 &p32->timestamp.tv_sec) || 770 assign_in_user(&p64->timestamp.tv_usec, 771 &p32->timestamp.tv_usec)) 772 return -EFAULT; 773 774 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 775 u32 num_planes = length; 776 777 if (num_planes == 0) { 778 /* 779 * num_planes == 0 is legal, e.g. when userspace doesn't 780 * need planes array on DQBUF 781 */ 782 return put_user(NULL, &p64->m.planes); 783 } 784 if (num_planes > VIDEO_MAX_PLANES) 785 return -EINVAL; 786 787 if (get_user(p, &p32->m.planes)) 788 return -EFAULT; 789 790 uplane32 = compat_ptr(p); 791 if (!access_ok(uplane32, 792 num_planes * sizeof(*uplane32))) 793 return -EFAULT; 794 795 /* 796 * We don't really care if userspace decides to kill itself 797 * by passing a very big num_planes value 798 */ 799 if (aux_space < num_planes * sizeof(*uplane)) 800 return -EFAULT; 801 802 uplane = aux_buf; 803 if (put_user_force(uplane, &p64->m.planes)) 804 return -EFAULT; 805 806 while (num_planes--) { 807 ret = get_v4l2_plane32(uplane, uplane32, memory); 808 if (ret) 809 return ret; 810 uplane++; 811 uplane32++; 812 } 813 } else { 814 switch (memory) { 815 case V4L2_MEMORY_MMAP: 816 case V4L2_MEMORY_OVERLAY: 817 if (assign_in_user(&p64->m.offset, &p32->m.offset)) 818 return -EFAULT; 819 break; 820 case V4L2_MEMORY_USERPTR: { 821 compat_ulong_t userptr; 822 823 if (get_user(userptr, &p32->m.userptr) || 824 put_user((unsigned long)compat_ptr(userptr), 825 &p64->m.userptr)) 826 return -EFAULT; 827 break; 828 } 829 case V4L2_MEMORY_DMABUF: 830 if (assign_in_user(&p64->m.fd, &p32->m.fd)) 831 return -EFAULT; 832 break; 833 } 834 } 835 836 return 0; 837 } 838 839 static int put_v4l2_buffer32(struct v4l2_buffer __user *p64, 840 struct v4l2_buffer32 __user *p32) 841 { 842 u32 type; 843 u32 length; 844 enum v4l2_memory memory; 845 struct v4l2_plane32 __user *uplane32; 846 struct v4l2_plane *uplane; 847 compat_caddr_t p; 848 int ret; 849 850 if (!access_ok(p32, sizeof(*p32)) || 851 assign_in_user(&p32->index, &p64->index) || 852 get_user(type, &p64->type) || 853 put_user(type, &p32->type) || 854 assign_in_user(&p32->flags, &p64->flags) || 855 get_user(memory, &p64->memory) || 856 put_user(memory, &p32->memory)) 857 return -EFAULT; 858 859 if (assign_in_user(&p32->bytesused, &p64->bytesused) || 860 assign_in_user(&p32->field, &p64->field) || 861 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || 862 assign_in_user(&p32->timestamp.tv_usec, &p64->timestamp.tv_usec) || 863 copy_in_user(&p32->timecode, &p64->timecode, sizeof(p64->timecode)) || 864 assign_in_user(&p32->sequence, &p64->sequence) || 865 assign_in_user(&p32->reserved2, &p64->reserved2) || 866 assign_in_user(&p32->request_fd, &p64->request_fd) || 867 get_user(length, &p64->length) || 868 put_user(length, &p32->length)) 869 return -EFAULT; 870 871 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 872 u32 num_planes = length; 873 874 if (num_planes == 0) 875 return 0; 876 /* We need to define uplane without __user, even though 877 * it does point to data in userspace here. The reason is 878 * that v4l2-ioctl.c copies it from userspace to kernelspace, 879 * so its definition in videodev2.h doesn't have a 880 * __user markup. Defining uplane with __user causes 881 * smatch warnings, so instead declare it without __user 882 * and cast it as a userspace pointer to put_v4l2_plane32(). 883 */ 884 if (get_user(uplane, &p64->m.planes)) 885 return -EFAULT; 886 if (get_user(p, &p32->m.planes)) 887 return -EFAULT; 888 uplane32 = compat_ptr(p); 889 890 while (num_planes--) { 891 ret = put_v4l2_plane32((void __user *)uplane, 892 uplane32, memory); 893 if (ret) 894 return ret; 895 ++uplane; 896 ++uplane32; 897 } 898 } else { 899 switch (memory) { 900 case V4L2_MEMORY_MMAP: 901 case V4L2_MEMORY_OVERLAY: 902 if (assign_in_user(&p32->m.offset, &p64->m.offset)) 903 return -EFAULT; 904 break; 905 case V4L2_MEMORY_USERPTR: 906 if (assign_in_user(&p32->m.userptr, &p64->m.userptr)) 907 return -EFAULT; 908 break; 909 case V4L2_MEMORY_DMABUF: 910 if (assign_in_user(&p32->m.fd, &p64->m.fd)) 911 return -EFAULT; 912 break; 913 } 914 } 915 916 return 0; 917 } 918 919 static int put_v4l2_buffer32_time32(struct v4l2_buffer_time32 __user *p64, 920 struct v4l2_buffer32_time32 __user *p32) 921 { 922 u32 type; 923 u32 length; 924 enum v4l2_memory memory; 925 struct v4l2_plane32 __user *uplane32; 926 struct v4l2_plane *uplane; 927 compat_caddr_t p; 928 int ret; 929 930 if (!access_ok(p32, sizeof(*p32)) || 931 assign_in_user(&p32->index, &p64->index) || 932 get_user(type, &p64->type) || 933 put_user(type, &p32->type) || 934 assign_in_user(&p32->flags, &p64->flags) || 935 get_user(memory, &p64->memory) || 936 put_user(memory, &p32->memory)) 937 return -EFAULT; 938 939 if (assign_in_user(&p32->bytesused, &p64->bytesused) || 940 assign_in_user(&p32->field, &p64->field) || 941 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || 942 assign_in_user(&p32->timestamp.tv_usec, &p64->timestamp.tv_usec) || 943 copy_in_user(&p32->timecode, &p64->timecode, sizeof(p64->timecode)) || 944 assign_in_user(&p32->sequence, &p64->sequence) || 945 assign_in_user(&p32->reserved2, &p64->reserved2) || 946 assign_in_user(&p32->request_fd, &p64->request_fd) || 947 get_user(length, &p64->length) || 948 put_user(length, &p32->length)) 949 return -EFAULT; 950 951 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 952 u32 num_planes = length; 953 954 if (num_planes == 0) 955 return 0; 956 /* We need to define uplane without __user, even though 957 * it does point to data in userspace here. The reason is 958 * that v4l2-ioctl.c copies it from userspace to kernelspace, 959 * so its definition in videodev2.h doesn't have a 960 * __user markup. Defining uplane with __user causes 961 * smatch warnings, so instead declare it without __user 962 * and cast it as a userspace pointer to put_v4l2_plane32(). 963 */ 964 if (get_user(uplane, &p64->m.planes)) 965 return -EFAULT; 966 if (get_user(p, &p32->m.planes)) 967 return -EFAULT; 968 uplane32 = compat_ptr(p); 969 970 while (num_planes--) { 971 ret = put_v4l2_plane32((void __user *)uplane, 972 uplane32, memory); 973 if (ret) 974 return ret; 975 ++uplane; 976 ++uplane32; 977 } 978 } else { 979 switch (memory) { 980 case V4L2_MEMORY_MMAP: 981 case V4L2_MEMORY_OVERLAY: 982 if (assign_in_user(&p32->m.offset, &p64->m.offset)) 983 return -EFAULT; 984 break; 985 case V4L2_MEMORY_USERPTR: 986 if (assign_in_user(&p32->m.userptr, &p64->m.userptr)) 987 return -EFAULT; 988 break; 989 case V4L2_MEMORY_DMABUF: 990 if (assign_in_user(&p32->m.fd, &p64->m.fd)) 991 return -EFAULT; 992 break; 993 } 994 } 995 996 return 0; 997 } 998 999 struct v4l2_framebuffer32 { 1000 __u32 capability; 1001 __u32 flags; 1002 compat_caddr_t base; 1003 struct { 1004 __u32 width; 1005 __u32 height; 1006 __u32 pixelformat; 1007 __u32 field; 1008 __u32 bytesperline; 1009 __u32 sizeimage; 1010 __u32 colorspace; 1011 __u32 priv; 1012 } fmt; 1013 }; 1014 1015 static int get_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64, 1016 struct v4l2_framebuffer32 __user *p32) 1017 { 1018 compat_caddr_t tmp; 1019 1020 if (!access_ok(p32, sizeof(*p32)) || 1021 get_user(tmp, &p32->base) || 1022 put_user_force(compat_ptr(tmp), &p64->base) || 1023 assign_in_user(&p64->capability, &p32->capability) || 1024 assign_in_user(&p64->flags, &p32->flags) || 1025 copy_in_user(&p64->fmt, &p32->fmt, sizeof(p64->fmt))) 1026 return -EFAULT; 1027 return 0; 1028 } 1029 1030 static int put_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64, 1031 struct v4l2_framebuffer32 __user *p32) 1032 { 1033 void *base; 1034 1035 if (!access_ok(p32, sizeof(*p32)) || 1036 get_user(base, &p64->base) || 1037 put_user(ptr_to_compat((void __user *)base), &p32->base) || 1038 assign_in_user(&p32->capability, &p64->capability) || 1039 assign_in_user(&p32->flags, &p64->flags) || 1040 copy_in_user(&p32->fmt, &p64->fmt, sizeof(p64->fmt))) 1041 return -EFAULT; 1042 return 0; 1043 } 1044 1045 struct v4l2_input32 { 1046 __u32 index; /* Which input */ 1047 __u8 name[32]; /* Label */ 1048 __u32 type; /* Type of input */ 1049 __u32 audioset; /* Associated audios (bitfield) */ 1050 __u32 tuner; /* Associated tuner */ 1051 compat_u64 std; 1052 __u32 status; 1053 __u32 capabilities; 1054 __u32 reserved[3]; 1055 }; 1056 1057 /* 1058 * The 64-bit v4l2_input struct has extra padding at the end of the struct. 1059 * Otherwise it is identical to the 32-bit version. 1060 */ 1061 static inline int get_v4l2_input32(struct v4l2_input __user *p64, 1062 struct v4l2_input32 __user *p32) 1063 { 1064 if (copy_in_user(p64, p32, sizeof(*p32))) 1065 return -EFAULT; 1066 return 0; 1067 } 1068 1069 static inline int put_v4l2_input32(struct v4l2_input __user *p64, 1070 struct v4l2_input32 __user *p32) 1071 { 1072 if (copy_in_user(p32, p64, sizeof(*p32))) 1073 return -EFAULT; 1074 return 0; 1075 } 1076 1077 struct v4l2_ext_controls32 { 1078 __u32 which; 1079 __u32 count; 1080 __u32 error_idx; 1081 __s32 request_fd; 1082 __u32 reserved[1]; 1083 compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */ 1084 }; 1085 1086 struct v4l2_ext_control32 { 1087 __u32 id; 1088 __u32 size; 1089 __u32 reserved2[1]; 1090 union { 1091 __s32 value; 1092 __s64 value64; 1093 compat_caddr_t string; /* actually char * */ 1094 }; 1095 } __attribute__ ((packed)); 1096 1097 /* Return true if this control is a pointer type. */ 1098 static inline bool ctrl_is_pointer(struct file *file, u32 id) 1099 { 1100 struct video_device *vdev = video_devdata(file); 1101 struct v4l2_fh *fh = NULL; 1102 struct v4l2_ctrl_handler *hdl = NULL; 1103 struct v4l2_query_ext_ctrl qec = { id }; 1104 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; 1105 1106 if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags)) 1107 fh = file->private_data; 1108 1109 if (fh && fh->ctrl_handler) 1110 hdl = fh->ctrl_handler; 1111 else if (vdev->ctrl_handler) 1112 hdl = vdev->ctrl_handler; 1113 1114 if (hdl) { 1115 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id); 1116 1117 return ctrl && ctrl->is_ptr; 1118 } 1119 1120 if (!ops || !ops->vidioc_query_ext_ctrl) 1121 return false; 1122 1123 return !ops->vidioc_query_ext_ctrl(file, fh, &qec) && 1124 (qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD); 1125 } 1126 1127 static int bufsize_v4l2_ext_controls(struct v4l2_ext_controls32 __user *p32, 1128 u32 *size) 1129 { 1130 u32 count; 1131 1132 if (!access_ok(p32, sizeof(*p32)) || 1133 get_user(count, &p32->count)) 1134 return -EFAULT; 1135 if (count > V4L2_CID_MAX_CTRLS) 1136 return -EINVAL; 1137 *size = count * sizeof(struct v4l2_ext_control); 1138 return 0; 1139 } 1140 1141 static int get_v4l2_ext_controls32(struct file *file, 1142 struct v4l2_ext_controls __user *p64, 1143 struct v4l2_ext_controls32 __user *p32, 1144 void __user *aux_buf, u32 aux_space) 1145 { 1146 struct v4l2_ext_control32 __user *ucontrols; 1147 struct v4l2_ext_control __user *kcontrols; 1148 u32 count; 1149 u32 n; 1150 compat_caddr_t p; 1151 1152 if (!access_ok(p32, sizeof(*p32)) || 1153 assign_in_user(&p64->which, &p32->which) || 1154 get_user(count, &p32->count) || 1155 put_user(count, &p64->count) || 1156 assign_in_user(&p64->error_idx, &p32->error_idx) || 1157 assign_in_user(&p64->request_fd, &p32->request_fd) || 1158 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved))) 1159 return -EFAULT; 1160 1161 if (count == 0) 1162 return put_user(NULL, &p64->controls); 1163 if (count > V4L2_CID_MAX_CTRLS) 1164 return -EINVAL; 1165 if (get_user(p, &p32->controls)) 1166 return -EFAULT; 1167 ucontrols = compat_ptr(p); 1168 if (!access_ok(ucontrols, count * sizeof(*ucontrols))) 1169 return -EFAULT; 1170 if (aux_space < count * sizeof(*kcontrols)) 1171 return -EFAULT; 1172 kcontrols = aux_buf; 1173 if (put_user_force(kcontrols, &p64->controls)) 1174 return -EFAULT; 1175 1176 for (n = 0; n < count; n++) { 1177 u32 id; 1178 1179 if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols))) 1180 return -EFAULT; 1181 1182 if (get_user(id, &kcontrols->id)) 1183 return -EFAULT; 1184 1185 if (ctrl_is_pointer(file, id)) { 1186 void __user *s; 1187 1188 if (get_user(p, &ucontrols->string)) 1189 return -EFAULT; 1190 s = compat_ptr(p); 1191 if (put_user(s, &kcontrols->string)) 1192 return -EFAULT; 1193 } 1194 ucontrols++; 1195 kcontrols++; 1196 } 1197 return 0; 1198 } 1199 1200 static int put_v4l2_ext_controls32(struct file *file, 1201 struct v4l2_ext_controls __user *p64, 1202 struct v4l2_ext_controls32 __user *p32) 1203 { 1204 struct v4l2_ext_control32 __user *ucontrols; 1205 struct v4l2_ext_control *kcontrols; 1206 u32 count; 1207 u32 n; 1208 compat_caddr_t p; 1209 1210 /* 1211 * We need to define kcontrols without __user, even though it does 1212 * point to data in userspace here. The reason is that v4l2-ioctl.c 1213 * copies it from userspace to kernelspace, so its definition in 1214 * videodev2.h doesn't have a __user markup. Defining kcontrols 1215 * with __user causes smatch warnings, so instead declare it 1216 * without __user and cast it as a userspace pointer where needed. 1217 */ 1218 if (!access_ok(p32, sizeof(*p32)) || 1219 assign_in_user(&p32->which, &p64->which) || 1220 get_user(count, &p64->count) || 1221 put_user(count, &p32->count) || 1222 assign_in_user(&p32->error_idx, &p64->error_idx) || 1223 assign_in_user(&p32->request_fd, &p64->request_fd) || 1224 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)) || 1225 get_user(kcontrols, &p64->controls)) 1226 return -EFAULT; 1227 1228 if (!count || count > (U32_MAX/sizeof(*ucontrols))) 1229 return 0; 1230 if (get_user(p, &p32->controls)) 1231 return -EFAULT; 1232 ucontrols = compat_ptr(p); 1233 if (!access_ok(ucontrols, count * sizeof(*ucontrols))) 1234 return -EFAULT; 1235 1236 for (n = 0; n < count; n++) { 1237 unsigned int size = sizeof(*ucontrols); 1238 u32 id; 1239 1240 if (get_user_cast(id, &kcontrols->id) || 1241 put_user(id, &ucontrols->id) || 1242 assign_in_user_cast(&ucontrols->size, &kcontrols->size) || 1243 copy_in_user(&ucontrols->reserved2, 1244 (void __user *)&kcontrols->reserved2, 1245 sizeof(ucontrols->reserved2))) 1246 return -EFAULT; 1247 1248 /* 1249 * Do not modify the pointer when copying a pointer control. 1250 * The contents of the pointer was changed, not the pointer 1251 * itself. 1252 */ 1253 if (ctrl_is_pointer(file, id)) 1254 size -= sizeof(ucontrols->value64); 1255 1256 if (copy_in_user(ucontrols, 1257 (void __user *)kcontrols, size)) 1258 return -EFAULT; 1259 1260 ucontrols++; 1261 kcontrols++; 1262 } 1263 return 0; 1264 } 1265 1266 #ifdef CONFIG_X86_64 1267 /* 1268 * x86 is the only compat architecture with different struct alignment 1269 * between 32-bit and 64-bit tasks. 1270 * 1271 * On all other architectures, v4l2_event32 and v4l2_event32_time32 are 1272 * the same as v4l2_event and v4l2_event_time32, so we can use the native 1273 * handlers, converting v4l2_event to v4l2_event_time32 if necessary. 1274 */ 1275 struct v4l2_event32 { 1276 __u32 type; 1277 union { 1278 compat_s64 value64; 1279 __u8 data[64]; 1280 } u; 1281 __u32 pending; 1282 __u32 sequence; 1283 struct { 1284 compat_s64 tv_sec; 1285 compat_s64 tv_nsec; 1286 } timestamp; 1287 __u32 id; 1288 __u32 reserved[8]; 1289 }; 1290 1291 struct v4l2_event32_time32 { 1292 __u32 type; 1293 union { 1294 compat_s64 value64; 1295 __u8 data[64]; 1296 } u; 1297 __u32 pending; 1298 __u32 sequence; 1299 struct old_timespec32 timestamp; 1300 __u32 id; 1301 __u32 reserved[8]; 1302 }; 1303 1304 static int put_v4l2_event32(struct v4l2_event __user *p64, 1305 struct v4l2_event32 __user *p32) 1306 { 1307 if (!access_ok(p32, sizeof(*p32)) || 1308 assign_in_user(&p32->type, &p64->type) || 1309 copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) || 1310 assign_in_user(&p32->pending, &p64->pending) || 1311 assign_in_user(&p32->sequence, &p64->sequence) || 1312 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || 1313 assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) || 1314 assign_in_user(&p32->id, &p64->id) || 1315 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 1316 return -EFAULT; 1317 return 0; 1318 } 1319 1320 static int put_v4l2_event32_time32(struct v4l2_event_time32 __user *p64, 1321 struct v4l2_event32_time32 __user *p32) 1322 { 1323 if (!access_ok(p32, sizeof(*p32)) || 1324 assign_in_user(&p32->type, &p64->type) || 1325 copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) || 1326 assign_in_user(&p32->pending, &p64->pending) || 1327 assign_in_user(&p32->sequence, &p64->sequence) || 1328 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || 1329 assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) || 1330 assign_in_user(&p32->id, &p64->id) || 1331 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 1332 return -EFAULT; 1333 return 0; 1334 } 1335 #endif 1336 1337 struct v4l2_edid32 { 1338 __u32 pad; 1339 __u32 start_block; 1340 __u32 blocks; 1341 __u32 reserved[5]; 1342 compat_caddr_t edid; 1343 }; 1344 1345 static int get_v4l2_edid32(struct v4l2_edid __user *p64, 1346 struct v4l2_edid32 __user *p32) 1347 { 1348 compat_uptr_t tmp; 1349 1350 if (!access_ok(p32, sizeof(*p32)) || 1351 assign_in_user(&p64->pad, &p32->pad) || 1352 assign_in_user(&p64->start_block, &p32->start_block) || 1353 assign_in_user_cast(&p64->blocks, &p32->blocks) || 1354 get_user(tmp, &p32->edid) || 1355 put_user_force(compat_ptr(tmp), &p64->edid) || 1356 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved))) 1357 return -EFAULT; 1358 return 0; 1359 } 1360 1361 static int put_v4l2_edid32(struct v4l2_edid __user *p64, 1362 struct v4l2_edid32 __user *p32) 1363 { 1364 void *edid; 1365 1366 if (!access_ok(p32, sizeof(*p32)) || 1367 assign_in_user(&p32->pad, &p64->pad) || 1368 assign_in_user(&p32->start_block, &p64->start_block) || 1369 assign_in_user(&p32->blocks, &p64->blocks) || 1370 get_user(edid, &p64->edid) || 1371 put_user(ptr_to_compat((void __user *)edid), &p32->edid) || 1372 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 1373 return -EFAULT; 1374 return 0; 1375 } 1376 1377 /* 1378 * List of ioctls that require 32-bits/64-bits conversion 1379 * 1380 * The V4L2 ioctls that aren't listed there don't have pointer arguments 1381 * and the struct size is identical for both 32 and 64 bits versions, so 1382 * they don't need translations. 1383 */ 1384 1385 #define VIDIOC_G_FMT32 _IOWR('V', 4, struct v4l2_format32) 1386 #define VIDIOC_S_FMT32 _IOWR('V', 5, struct v4l2_format32) 1387 #define VIDIOC_QUERYBUF32 _IOWR('V', 9, struct v4l2_buffer32) 1388 #define VIDIOC_QUERYBUF32_TIME32 _IOWR('V', 9, struct v4l2_buffer32_time32) 1389 #define VIDIOC_G_FBUF32 _IOR ('V', 10, struct v4l2_framebuffer32) 1390 #define VIDIOC_S_FBUF32 _IOW ('V', 11, struct v4l2_framebuffer32) 1391 #define VIDIOC_QBUF32 _IOWR('V', 15, struct v4l2_buffer32) 1392 #define VIDIOC_QBUF32_TIME32 _IOWR('V', 15, struct v4l2_buffer32_time32) 1393 #define VIDIOC_DQBUF32 _IOWR('V', 17, struct v4l2_buffer32) 1394 #define VIDIOC_DQBUF32_TIME32 _IOWR('V', 17, struct v4l2_buffer32_time32) 1395 #define VIDIOC_ENUMSTD32 _IOWR('V', 25, struct v4l2_standard32) 1396 #define VIDIOC_ENUMINPUT32 _IOWR('V', 26, struct v4l2_input32) 1397 #define VIDIOC_G_EDID32 _IOWR('V', 40, struct v4l2_edid32) 1398 #define VIDIOC_S_EDID32 _IOWR('V', 41, struct v4l2_edid32) 1399 #define VIDIOC_TRY_FMT32 _IOWR('V', 64, struct v4l2_format32) 1400 #define VIDIOC_G_EXT_CTRLS32 _IOWR('V', 71, struct v4l2_ext_controls32) 1401 #define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32) 1402 #define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32) 1403 #define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32) 1404 #define VIDIOC_DQEVENT32_TIME32 _IOR ('V', 89, struct v4l2_event32_time32) 1405 #define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32) 1406 #define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32) 1407 #define VIDIOC_PREPARE_BUF32_TIME32 _IOWR('V', 93, struct v4l2_buffer32_time32) 1408 1409 #define VIDIOC_OVERLAY32 _IOW ('V', 14, s32) 1410 #define VIDIOC_STREAMON32 _IOW ('V', 18, s32) 1411 #define VIDIOC_STREAMOFF32 _IOW ('V', 19, s32) 1412 #define VIDIOC_G_INPUT32 _IOR ('V', 38, s32) 1413 #define VIDIOC_S_INPUT32 _IOWR('V', 39, s32) 1414 #define VIDIOC_G_OUTPUT32 _IOR ('V', 46, s32) 1415 #define VIDIOC_S_OUTPUT32 _IOWR('V', 47, s32) 1416 1417 /** 1418 * alloc_userspace() - Allocates a 64-bits userspace pointer compatible 1419 * for calling the native 64-bits version of an ioctl. 1420 * 1421 * @size: size of the structure itself to be allocated. 1422 * @aux_space: extra size needed to store "extra" data, e.g. space for 1423 * other __user data that is pointed to fields inside the 1424 * structure. 1425 * @new_p64: pointer to a pointer to be filled with the allocated struct. 1426 * 1427 * Return: 1428 * 1429 * if it can't allocate memory, either -ENOMEM or -EFAULT will be returned. 1430 * Zero otherwise. 1431 */ 1432 static int alloc_userspace(unsigned int size, u32 aux_space, 1433 void __user **new_p64) 1434 { 1435 *new_p64 = compat_alloc_user_space(size + aux_space); 1436 if (!*new_p64) 1437 return -ENOMEM; 1438 if (clear_user(*new_p64, size)) 1439 return -EFAULT; 1440 return 0; 1441 } 1442 1443 /** 1444 * do_video_ioctl() - Ancillary function with handles a compat32 ioctl call 1445 * 1446 * @file: pointer to &struct file with the file handler 1447 * @cmd: ioctl to be called 1448 * @arg: arguments passed from/to the ioctl handler 1449 * 1450 * This function is called when a 32 bits application calls a V4L2 ioctl 1451 * and the Kernel is compiled with 64 bits. 1452 * 1453 * This function is called by v4l2_compat_ioctl32() when the function is 1454 * not private to some specific driver. 1455 * 1456 * It converts a 32-bits struct into a 64 bits one, calls the native 64-bits 1457 * ioctl handler and fills back the 32-bits struct with the results of the 1458 * native call. 1459 */ 1460 static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1461 { 1462 void __user *p32 = compat_ptr(arg); 1463 void __user *new_p64 = NULL; 1464 void __user *aux_buf; 1465 u32 aux_space; 1466 int compatible_arg = 1; 1467 long err = 0; 1468 unsigned int ncmd; 1469 1470 /* 1471 * 1. When struct size is different, converts the command. 1472 */ 1473 switch (cmd) { 1474 case VIDIOC_G_FMT32: ncmd = VIDIOC_G_FMT; break; 1475 case VIDIOC_S_FMT32: ncmd = VIDIOC_S_FMT; break; 1476 case VIDIOC_QUERYBUF32: ncmd = VIDIOC_QUERYBUF; break; 1477 case VIDIOC_QUERYBUF32_TIME32: ncmd = VIDIOC_QUERYBUF_TIME32; break; 1478 case VIDIOC_G_FBUF32: ncmd = VIDIOC_G_FBUF; break; 1479 case VIDIOC_S_FBUF32: ncmd = VIDIOC_S_FBUF; break; 1480 case VIDIOC_QBUF32: ncmd = VIDIOC_QBUF; break; 1481 case VIDIOC_QBUF32_TIME32: ncmd = VIDIOC_QBUF_TIME32; break; 1482 case VIDIOC_DQBUF32: ncmd = VIDIOC_DQBUF; break; 1483 case VIDIOC_DQBUF32_TIME32: ncmd = VIDIOC_DQBUF_TIME32; break; 1484 case VIDIOC_ENUMSTD32: ncmd = VIDIOC_ENUMSTD; break; 1485 case VIDIOC_ENUMINPUT32: ncmd = VIDIOC_ENUMINPUT; break; 1486 case VIDIOC_TRY_FMT32: ncmd = VIDIOC_TRY_FMT; break; 1487 case VIDIOC_G_EXT_CTRLS32: ncmd = VIDIOC_G_EXT_CTRLS; break; 1488 case VIDIOC_S_EXT_CTRLS32: ncmd = VIDIOC_S_EXT_CTRLS; break; 1489 case VIDIOC_TRY_EXT_CTRLS32: ncmd = VIDIOC_TRY_EXT_CTRLS; break; 1490 #ifdef CONFIG_X86_64 1491 case VIDIOC_DQEVENT32: ncmd = VIDIOC_DQEVENT; break; 1492 case VIDIOC_DQEVENT32_TIME32: ncmd = VIDIOC_DQEVENT_TIME32; break; 1493 #endif 1494 case VIDIOC_OVERLAY32: ncmd = VIDIOC_OVERLAY; break; 1495 case VIDIOC_STREAMON32: ncmd = VIDIOC_STREAMON; break; 1496 case VIDIOC_STREAMOFF32: ncmd = VIDIOC_STREAMOFF; break; 1497 case VIDIOC_G_INPUT32: ncmd = VIDIOC_G_INPUT; break; 1498 case VIDIOC_S_INPUT32: ncmd = VIDIOC_S_INPUT; break; 1499 case VIDIOC_G_OUTPUT32: ncmd = VIDIOC_G_OUTPUT; break; 1500 case VIDIOC_S_OUTPUT32: ncmd = VIDIOC_S_OUTPUT; break; 1501 case VIDIOC_CREATE_BUFS32: ncmd = VIDIOC_CREATE_BUFS; break; 1502 case VIDIOC_PREPARE_BUF32: ncmd = VIDIOC_PREPARE_BUF; break; 1503 case VIDIOC_PREPARE_BUF32_TIME32: ncmd = VIDIOC_PREPARE_BUF_TIME32; break; 1504 case VIDIOC_G_EDID32: ncmd = VIDIOC_G_EDID; break; 1505 case VIDIOC_S_EDID32: ncmd = VIDIOC_S_EDID; break; 1506 default: ncmd = cmd; break; 1507 } 1508 1509 /* 1510 * 2. Allocates a 64-bits userspace pointer to store the 1511 * values of the ioctl and copy data from the 32-bits __user 1512 * argument into it. 1513 */ 1514 switch (cmd) { 1515 case VIDIOC_OVERLAY32: 1516 case VIDIOC_STREAMON32: 1517 case VIDIOC_STREAMOFF32: 1518 case VIDIOC_S_INPUT32: 1519 case VIDIOC_S_OUTPUT32: 1520 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64); 1521 if (!err && assign_in_user((unsigned int __user *)new_p64, 1522 (compat_uint_t __user *)p32)) 1523 err = -EFAULT; 1524 compatible_arg = 0; 1525 break; 1526 1527 case VIDIOC_G_INPUT32: 1528 case VIDIOC_G_OUTPUT32: 1529 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64); 1530 compatible_arg = 0; 1531 break; 1532 1533 case VIDIOC_G_EDID32: 1534 case VIDIOC_S_EDID32: 1535 err = alloc_userspace(sizeof(struct v4l2_edid), 0, &new_p64); 1536 if (!err) 1537 err = get_v4l2_edid32(new_p64, p32); 1538 compatible_arg = 0; 1539 break; 1540 1541 case VIDIOC_G_FMT32: 1542 case VIDIOC_S_FMT32: 1543 case VIDIOC_TRY_FMT32: 1544 err = bufsize_v4l2_format(p32, &aux_space); 1545 if (!err) 1546 err = alloc_userspace(sizeof(struct v4l2_format), 1547 aux_space, &new_p64); 1548 if (!err) { 1549 aux_buf = new_p64 + sizeof(struct v4l2_format); 1550 err = get_v4l2_format32(new_p64, p32, 1551 aux_buf, aux_space); 1552 } 1553 compatible_arg = 0; 1554 break; 1555 1556 case VIDIOC_CREATE_BUFS32: 1557 err = bufsize_v4l2_create(p32, &aux_space); 1558 if (!err) 1559 err = alloc_userspace(sizeof(struct v4l2_create_buffers), 1560 aux_space, &new_p64); 1561 if (!err) { 1562 aux_buf = new_p64 + sizeof(struct v4l2_create_buffers); 1563 err = get_v4l2_create32(new_p64, p32, 1564 aux_buf, aux_space); 1565 } 1566 compatible_arg = 0; 1567 break; 1568 1569 case VIDIOC_PREPARE_BUF32: 1570 case VIDIOC_QUERYBUF32: 1571 case VIDIOC_QBUF32: 1572 case VIDIOC_DQBUF32: 1573 err = bufsize_v4l2_buffer(p32, &aux_space); 1574 if (!err) 1575 err = alloc_userspace(sizeof(struct v4l2_buffer), 1576 aux_space, &new_p64); 1577 if (!err) { 1578 aux_buf = new_p64 + sizeof(struct v4l2_buffer); 1579 err = get_v4l2_buffer32(new_p64, p32, 1580 aux_buf, aux_space); 1581 } 1582 compatible_arg = 0; 1583 break; 1584 1585 case VIDIOC_PREPARE_BUF32_TIME32: 1586 case VIDIOC_QUERYBUF32_TIME32: 1587 case VIDIOC_QBUF32_TIME32: 1588 case VIDIOC_DQBUF32_TIME32: 1589 err = bufsize_v4l2_buffer_time32(p32, &aux_space); 1590 if (!err) 1591 err = alloc_userspace(sizeof(struct v4l2_buffer), 1592 aux_space, &new_p64); 1593 if (!err) { 1594 aux_buf = new_p64 + sizeof(struct v4l2_buffer); 1595 err = get_v4l2_buffer32_time32(new_p64, p32, 1596 aux_buf, aux_space); 1597 } 1598 compatible_arg = 0; 1599 break; 1600 1601 case VIDIOC_S_FBUF32: 1602 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0, 1603 &new_p64); 1604 if (!err) 1605 err = get_v4l2_framebuffer32(new_p64, p32); 1606 compatible_arg = 0; 1607 break; 1608 1609 case VIDIOC_G_FBUF32: 1610 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0, 1611 &new_p64); 1612 compatible_arg = 0; 1613 break; 1614 1615 case VIDIOC_ENUMSTD32: 1616 err = alloc_userspace(sizeof(struct v4l2_standard), 0, 1617 &new_p64); 1618 if (!err) 1619 err = get_v4l2_standard32(new_p64, p32); 1620 compatible_arg = 0; 1621 break; 1622 1623 case VIDIOC_ENUMINPUT32: 1624 err = alloc_userspace(sizeof(struct v4l2_input), 0, &new_p64); 1625 if (!err) 1626 err = get_v4l2_input32(new_p64, p32); 1627 compatible_arg = 0; 1628 break; 1629 1630 case VIDIOC_G_EXT_CTRLS32: 1631 case VIDIOC_S_EXT_CTRLS32: 1632 case VIDIOC_TRY_EXT_CTRLS32: 1633 err = bufsize_v4l2_ext_controls(p32, &aux_space); 1634 if (!err) 1635 err = alloc_userspace(sizeof(struct v4l2_ext_controls), 1636 aux_space, &new_p64); 1637 if (!err) { 1638 aux_buf = new_p64 + sizeof(struct v4l2_ext_controls); 1639 err = get_v4l2_ext_controls32(file, new_p64, p32, 1640 aux_buf, aux_space); 1641 } 1642 compatible_arg = 0; 1643 break; 1644 #ifdef CONFIG_X86_64 1645 case VIDIOC_DQEVENT32: 1646 err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64); 1647 compatible_arg = 0; 1648 break; 1649 case VIDIOC_DQEVENT32_TIME32: 1650 err = alloc_userspace(sizeof(struct v4l2_event_time32), 0, &new_p64); 1651 compatible_arg = 0; 1652 break; 1653 #endif 1654 } 1655 if (err) 1656 return err; 1657 1658 /* 1659 * 3. Calls the native 64-bits ioctl handler. 1660 * 1661 * For the functions where a conversion was not needed, 1662 * compatible_arg is true, and it will call it with the arguments 1663 * provided by userspace and stored at @p32 var. 1664 * 1665 * Otherwise, it will pass the newly allocated @new_p64 argument. 1666 */ 1667 if (compatible_arg) 1668 err = native_ioctl(file, ncmd, (unsigned long)p32); 1669 else 1670 err = native_ioctl(file, ncmd, (unsigned long)new_p64); 1671 1672 if (err == -ENOTTY) 1673 return err; 1674 1675 /* 1676 * 4. Special case: even after an error we need to put the 1677 * results back for some ioctls. 1678 * 1679 * In the case of EXT_CTRLS, the error_idx will contain information 1680 * on which control failed. 1681 * 1682 * In the case of S_EDID, the driver can return E2BIG and set 1683 * the blocks to maximum allowed value. 1684 */ 1685 switch (cmd) { 1686 case VIDIOC_G_EXT_CTRLS32: 1687 case VIDIOC_S_EXT_CTRLS32: 1688 case VIDIOC_TRY_EXT_CTRLS32: 1689 if (put_v4l2_ext_controls32(file, new_p64, p32)) 1690 err = -EFAULT; 1691 break; 1692 case VIDIOC_S_EDID32: 1693 if (put_v4l2_edid32(new_p64, p32)) 1694 err = -EFAULT; 1695 break; 1696 } 1697 if (err) 1698 return err; 1699 1700 /* 1701 * 5. Copy the data returned at the 64 bits userspace pointer to 1702 * the original 32 bits structure. 1703 */ 1704 switch (cmd) { 1705 case VIDIOC_S_INPUT32: 1706 case VIDIOC_S_OUTPUT32: 1707 case VIDIOC_G_INPUT32: 1708 case VIDIOC_G_OUTPUT32: 1709 if (assign_in_user((compat_uint_t __user *)p32, 1710 ((unsigned int __user *)new_p64))) 1711 err = -EFAULT; 1712 break; 1713 1714 case VIDIOC_G_FBUF32: 1715 err = put_v4l2_framebuffer32(new_p64, p32); 1716 break; 1717 1718 #ifdef CONFIG_X86_64 1719 case VIDIOC_DQEVENT32: 1720 err = put_v4l2_event32(new_p64, p32); 1721 break; 1722 1723 case VIDIOC_DQEVENT32_TIME32: 1724 err = put_v4l2_event32_time32(new_p64, p32); 1725 break; 1726 #endif 1727 1728 case VIDIOC_G_EDID32: 1729 err = put_v4l2_edid32(new_p64, p32); 1730 break; 1731 1732 case VIDIOC_G_FMT32: 1733 case VIDIOC_S_FMT32: 1734 case VIDIOC_TRY_FMT32: 1735 err = put_v4l2_format32(new_p64, p32); 1736 break; 1737 1738 case VIDIOC_CREATE_BUFS32: 1739 err = put_v4l2_create32(new_p64, p32); 1740 break; 1741 1742 case VIDIOC_PREPARE_BUF32: 1743 case VIDIOC_QUERYBUF32: 1744 case VIDIOC_QBUF32: 1745 case VIDIOC_DQBUF32: 1746 err = put_v4l2_buffer32(new_p64, p32); 1747 break; 1748 1749 case VIDIOC_PREPARE_BUF32_TIME32: 1750 case VIDIOC_QUERYBUF32_TIME32: 1751 case VIDIOC_QBUF32_TIME32: 1752 case VIDIOC_DQBUF32_TIME32: 1753 err = put_v4l2_buffer32_time32(new_p64, p32); 1754 break; 1755 1756 case VIDIOC_ENUMSTD32: 1757 err = put_v4l2_standard32(new_p64, p32); 1758 break; 1759 1760 case VIDIOC_ENUMINPUT32: 1761 err = put_v4l2_input32(new_p64, p32); 1762 break; 1763 } 1764 return err; 1765 } 1766 1767 /** 1768 * v4l2_compat_ioctl32() - Handles a compat32 ioctl call 1769 * 1770 * @file: pointer to &struct file with the file handler 1771 * @cmd: ioctl to be called 1772 * @arg: arguments passed from/to the ioctl handler 1773 * 1774 * This function is meant to be used as .compat_ioctl fops at v4l2-dev.c 1775 * in order to deal with 32-bit calls on a 64-bits Kernel. 1776 * 1777 * This function calls do_video_ioctl() for non-private V4L2 ioctls. 1778 * If the function is a private one it calls vdev->fops->compat_ioctl32 1779 * instead. 1780 */ 1781 long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg) 1782 { 1783 struct video_device *vdev = video_devdata(file); 1784 long ret = -ENOIOCTLCMD; 1785 1786 if (!file->f_op->unlocked_ioctl) 1787 return ret; 1788 1789 if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE) 1790 ret = do_video_ioctl(file, cmd, arg); 1791 else if (vdev->fops->compat_ioctl32) 1792 ret = vdev->fops->compat_ioctl32(file, cmd, arg); 1793 1794 if (ret == -ENOIOCTLCMD) 1795 pr_debug("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)\n", 1796 _IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd); 1797 return ret; 1798 } 1799 EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32); 1800