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