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(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(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 case V4L2_BUF_TYPE_META_OUTPUT: 327 return copy_in_user(&p64->fmt.meta, &p32->fmt.meta, 328 sizeof(p64->fmt.meta)) ? -EFAULT : 0; 329 default: 330 return -EINVAL; 331 } 332 } 333 334 static int get_v4l2_format32(struct v4l2_format __user *p64, 335 struct v4l2_format32 __user *p32, 336 void __user *aux_buf, u32 aux_space) 337 { 338 if (!access_ok(p32, sizeof(*p32))) 339 return -EFAULT; 340 return __get_v4l2_format32(p64, p32, aux_buf, aux_space); 341 } 342 343 static int bufsize_v4l2_create(struct v4l2_create_buffers32 __user *p32, 344 u32 *size) 345 { 346 if (!access_ok(p32, sizeof(*p32))) 347 return -EFAULT; 348 return __bufsize_v4l2_format(&p32->format, size); 349 } 350 351 static int get_v4l2_create32(struct v4l2_create_buffers __user *p64, 352 struct v4l2_create_buffers32 __user *p32, 353 void __user *aux_buf, u32 aux_space) 354 { 355 if (!access_ok(p32, sizeof(*p32)) || 356 copy_in_user(p64, p32, 357 offsetof(struct v4l2_create_buffers32, format))) 358 return -EFAULT; 359 return __get_v4l2_format32(&p64->format, &p32->format, 360 aux_buf, aux_space); 361 } 362 363 static int __put_v4l2_format32(struct v4l2_format __user *p64, 364 struct v4l2_format32 __user *p32) 365 { 366 u32 type; 367 368 if (get_user(type, &p64->type)) 369 return -EFAULT; 370 371 switch (type) { 372 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 373 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 374 return copy_in_user(&p32->fmt.pix, &p64->fmt.pix, 375 sizeof(p64->fmt.pix)) ? -EFAULT : 0; 376 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE: 377 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: 378 return copy_in_user(&p32->fmt.pix_mp, &p64->fmt.pix_mp, 379 sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0; 380 case V4L2_BUF_TYPE_VIDEO_OVERLAY: 381 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: 382 return put_v4l2_window32(&p64->fmt.win, &p32->fmt.win); 383 case V4L2_BUF_TYPE_VBI_CAPTURE: 384 case V4L2_BUF_TYPE_VBI_OUTPUT: 385 return copy_in_user(&p32->fmt.vbi, &p64->fmt.vbi, 386 sizeof(p64->fmt.vbi)) ? -EFAULT : 0; 387 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: 388 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: 389 return copy_in_user(&p32->fmt.sliced, &p64->fmt.sliced, 390 sizeof(p64->fmt.sliced)) ? -EFAULT : 0; 391 case V4L2_BUF_TYPE_SDR_CAPTURE: 392 case V4L2_BUF_TYPE_SDR_OUTPUT: 393 return copy_in_user(&p32->fmt.sdr, &p64->fmt.sdr, 394 sizeof(p64->fmt.sdr)) ? -EFAULT : 0; 395 case V4L2_BUF_TYPE_META_CAPTURE: 396 case V4L2_BUF_TYPE_META_OUTPUT: 397 return copy_in_user(&p32->fmt.meta, &p64->fmt.meta, 398 sizeof(p64->fmt.meta)) ? -EFAULT : 0; 399 default: 400 return -EINVAL; 401 } 402 } 403 404 static int put_v4l2_format32(struct v4l2_format __user *p64, 405 struct v4l2_format32 __user *p32) 406 { 407 if (!access_ok(p32, sizeof(*p32))) 408 return -EFAULT; 409 return __put_v4l2_format32(p64, p32); 410 } 411 412 static int put_v4l2_create32(struct v4l2_create_buffers __user *p64, 413 struct v4l2_create_buffers32 __user *p32) 414 { 415 if (!access_ok(p32, sizeof(*p32)) || 416 copy_in_user(p32, p64, 417 offsetof(struct v4l2_create_buffers32, format)) || 418 assign_in_user(&p32->capabilities, &p64->capabilities) || 419 copy_in_user(p32->reserved, p64->reserved, sizeof(p64->reserved))) 420 return -EFAULT; 421 return __put_v4l2_format32(&p64->format, &p32->format); 422 } 423 424 struct v4l2_standard32 { 425 __u32 index; 426 compat_u64 id; 427 __u8 name[24]; 428 struct v4l2_fract frameperiod; /* Frames, not fields */ 429 __u32 framelines; 430 __u32 reserved[4]; 431 }; 432 433 static int get_v4l2_standard32(struct v4l2_standard __user *p64, 434 struct v4l2_standard32 __user *p32) 435 { 436 /* other fields are not set by the user, nor used by the driver */ 437 if (!access_ok(p32, sizeof(*p32)) || 438 assign_in_user(&p64->index, &p32->index)) 439 return -EFAULT; 440 return 0; 441 } 442 443 static int put_v4l2_standard32(struct v4l2_standard __user *p64, 444 struct v4l2_standard32 __user *p32) 445 { 446 if (!access_ok(p32, sizeof(*p32)) || 447 assign_in_user(&p32->index, &p64->index) || 448 assign_in_user(&p32->id, &p64->id) || 449 copy_in_user(p32->name, p64->name, sizeof(p32->name)) || 450 copy_in_user(&p32->frameperiod, &p64->frameperiod, 451 sizeof(p32->frameperiod)) || 452 assign_in_user(&p32->framelines, &p64->framelines) || 453 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 454 return -EFAULT; 455 return 0; 456 } 457 458 struct v4l2_plane32 { 459 __u32 bytesused; 460 __u32 length; 461 union { 462 __u32 mem_offset; 463 compat_long_t userptr; 464 __s32 fd; 465 } m; 466 __u32 data_offset; 467 __u32 reserved[11]; 468 }; 469 470 struct v4l2_buffer32 { 471 __u32 index; 472 __u32 type; /* enum v4l2_buf_type */ 473 __u32 bytesused; 474 __u32 flags; 475 __u32 field; /* enum v4l2_field */ 476 struct compat_timeval timestamp; 477 struct v4l2_timecode timecode; 478 __u32 sequence; 479 480 /* memory location */ 481 __u32 memory; /* enum v4l2_memory */ 482 union { 483 __u32 offset; 484 compat_long_t userptr; 485 compat_caddr_t planes; 486 __s32 fd; 487 } m; 488 __u32 length; 489 __u32 reserved2; 490 __s32 request_fd; 491 }; 492 493 static int get_v4l2_plane32(struct v4l2_plane __user *p64, 494 struct v4l2_plane32 __user *p32, 495 enum v4l2_memory memory) 496 { 497 compat_ulong_t p; 498 499 if (copy_in_user(p64, p32, 2 * sizeof(__u32)) || 500 copy_in_user(&p64->data_offset, &p32->data_offset, 501 sizeof(p64->data_offset))) 502 return -EFAULT; 503 504 switch (memory) { 505 case V4L2_MEMORY_MMAP: 506 case V4L2_MEMORY_OVERLAY: 507 if (copy_in_user(&p64->m.mem_offset, &p32->m.mem_offset, 508 sizeof(p32->m.mem_offset))) 509 return -EFAULT; 510 break; 511 case V4L2_MEMORY_USERPTR: 512 if (get_user(p, &p32->m.userptr) || 513 put_user((unsigned long)compat_ptr(p), &p64->m.userptr)) 514 return -EFAULT; 515 break; 516 case V4L2_MEMORY_DMABUF: 517 if (copy_in_user(&p64->m.fd, &p32->m.fd, sizeof(p32->m.fd))) 518 return -EFAULT; 519 break; 520 } 521 522 return 0; 523 } 524 525 static int put_v4l2_plane32(struct v4l2_plane __user *p64, 526 struct v4l2_plane32 __user *p32, 527 enum v4l2_memory memory) 528 { 529 unsigned long p; 530 531 if (copy_in_user(p32, p64, 2 * sizeof(__u32)) || 532 copy_in_user(&p32->data_offset, &p64->data_offset, 533 sizeof(p64->data_offset))) 534 return -EFAULT; 535 536 switch (memory) { 537 case V4L2_MEMORY_MMAP: 538 case V4L2_MEMORY_OVERLAY: 539 if (copy_in_user(&p32->m.mem_offset, &p64->m.mem_offset, 540 sizeof(p64->m.mem_offset))) 541 return -EFAULT; 542 break; 543 case V4L2_MEMORY_USERPTR: 544 if (get_user(p, &p64->m.userptr) || 545 put_user((compat_ulong_t)ptr_to_compat((void __user *)p), 546 &p32->m.userptr)) 547 return -EFAULT; 548 break; 549 case V4L2_MEMORY_DMABUF: 550 if (copy_in_user(&p32->m.fd, &p64->m.fd, sizeof(p64->m.fd))) 551 return -EFAULT; 552 break; 553 } 554 555 return 0; 556 } 557 558 static int bufsize_v4l2_buffer(struct v4l2_buffer32 __user *p32, u32 *size) 559 { 560 u32 type; 561 u32 length; 562 563 if (!access_ok(p32, sizeof(*p32)) || 564 get_user(type, &p32->type) || 565 get_user(length, &p32->length)) 566 return -EFAULT; 567 568 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 569 if (length > VIDEO_MAX_PLANES) 570 return -EINVAL; 571 572 /* 573 * We don't really care if userspace decides to kill itself 574 * by passing a very big length value 575 */ 576 *size = length * sizeof(struct v4l2_plane); 577 } else { 578 *size = 0; 579 } 580 return 0; 581 } 582 583 static int get_v4l2_buffer32(struct v4l2_buffer __user *p64, 584 struct v4l2_buffer32 __user *p32, 585 void __user *aux_buf, u32 aux_space) 586 { 587 u32 type; 588 u32 length; 589 s32 request_fd; 590 enum v4l2_memory memory; 591 struct v4l2_plane32 __user *uplane32; 592 struct v4l2_plane __user *uplane; 593 compat_caddr_t p; 594 int ret; 595 596 if (!access_ok(p32, sizeof(*p32)) || 597 assign_in_user(&p64->index, &p32->index) || 598 get_user(type, &p32->type) || 599 put_user(type, &p64->type) || 600 assign_in_user(&p64->flags, &p32->flags) || 601 get_user(memory, &p32->memory) || 602 put_user(memory, &p64->memory) || 603 get_user(length, &p32->length) || 604 put_user(length, &p64->length) || 605 get_user(request_fd, &p32->request_fd) || 606 put_user(request_fd, &p64->request_fd)) 607 return -EFAULT; 608 609 if (V4L2_TYPE_IS_OUTPUT(type)) 610 if (assign_in_user(&p64->bytesused, &p32->bytesused) || 611 assign_in_user(&p64->field, &p32->field) || 612 assign_in_user(&p64->timestamp.tv_sec, 613 &p32->timestamp.tv_sec) || 614 assign_in_user(&p64->timestamp.tv_usec, 615 &p32->timestamp.tv_usec)) 616 return -EFAULT; 617 618 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 619 u32 num_planes = length; 620 621 if (num_planes == 0) { 622 /* 623 * num_planes == 0 is legal, e.g. when userspace doesn't 624 * need planes array on DQBUF 625 */ 626 return put_user(NULL, &p64->m.planes); 627 } 628 if (num_planes > VIDEO_MAX_PLANES) 629 return -EINVAL; 630 631 if (get_user(p, &p32->m.planes)) 632 return -EFAULT; 633 634 uplane32 = compat_ptr(p); 635 if (!access_ok(uplane32, 636 num_planes * sizeof(*uplane32))) 637 return -EFAULT; 638 639 /* 640 * We don't really care if userspace decides to kill itself 641 * by passing a very big num_planes value 642 */ 643 if (aux_space < num_planes * sizeof(*uplane)) 644 return -EFAULT; 645 646 uplane = aux_buf; 647 if (put_user_force(uplane, &p64->m.planes)) 648 return -EFAULT; 649 650 while (num_planes--) { 651 ret = get_v4l2_plane32(uplane, uplane32, memory); 652 if (ret) 653 return ret; 654 uplane++; 655 uplane32++; 656 } 657 } else { 658 switch (memory) { 659 case V4L2_MEMORY_MMAP: 660 case V4L2_MEMORY_OVERLAY: 661 if (assign_in_user(&p64->m.offset, &p32->m.offset)) 662 return -EFAULT; 663 break; 664 case V4L2_MEMORY_USERPTR: { 665 compat_ulong_t userptr; 666 667 if (get_user(userptr, &p32->m.userptr) || 668 put_user((unsigned long)compat_ptr(userptr), 669 &p64->m.userptr)) 670 return -EFAULT; 671 break; 672 } 673 case V4L2_MEMORY_DMABUF: 674 if (assign_in_user(&p64->m.fd, &p32->m.fd)) 675 return -EFAULT; 676 break; 677 } 678 } 679 680 return 0; 681 } 682 683 static int put_v4l2_buffer32(struct v4l2_buffer __user *p64, 684 struct v4l2_buffer32 __user *p32) 685 { 686 u32 type; 687 u32 length; 688 enum v4l2_memory memory; 689 struct v4l2_plane32 __user *uplane32; 690 struct v4l2_plane *uplane; 691 compat_caddr_t p; 692 int ret; 693 694 if (!access_ok(p32, sizeof(*p32)) || 695 assign_in_user(&p32->index, &p64->index) || 696 get_user(type, &p64->type) || 697 put_user(type, &p32->type) || 698 assign_in_user(&p32->flags, &p64->flags) || 699 get_user(memory, &p64->memory) || 700 put_user(memory, &p32->memory)) 701 return -EFAULT; 702 703 if (assign_in_user(&p32->bytesused, &p64->bytesused) || 704 assign_in_user(&p32->field, &p64->field) || 705 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || 706 assign_in_user(&p32->timestamp.tv_usec, &p64->timestamp.tv_usec) || 707 copy_in_user(&p32->timecode, &p64->timecode, sizeof(p64->timecode)) || 708 assign_in_user(&p32->sequence, &p64->sequence) || 709 assign_in_user(&p32->reserved2, &p64->reserved2) || 710 assign_in_user(&p32->request_fd, &p64->request_fd) || 711 get_user(length, &p64->length) || 712 put_user(length, &p32->length)) 713 return -EFAULT; 714 715 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 716 u32 num_planes = length; 717 718 if (num_planes == 0) 719 return 0; 720 /* We need to define uplane without __user, even though 721 * it does point to data in userspace here. The reason is 722 * that v4l2-ioctl.c copies it from userspace to kernelspace, 723 * so its definition in videodev2.h doesn't have a 724 * __user markup. Defining uplane with __user causes 725 * smatch warnings, so instead declare it without __user 726 * and cast it as a userspace pointer to put_v4l2_plane32(). 727 */ 728 if (get_user(uplane, &p64->m.planes)) 729 return -EFAULT; 730 if (get_user(p, &p32->m.planes)) 731 return -EFAULT; 732 uplane32 = compat_ptr(p); 733 734 while (num_planes--) { 735 ret = put_v4l2_plane32((void __user *)uplane, 736 uplane32, memory); 737 if (ret) 738 return ret; 739 ++uplane; 740 ++uplane32; 741 } 742 } else { 743 switch (memory) { 744 case V4L2_MEMORY_MMAP: 745 case V4L2_MEMORY_OVERLAY: 746 if (assign_in_user(&p32->m.offset, &p64->m.offset)) 747 return -EFAULT; 748 break; 749 case V4L2_MEMORY_USERPTR: 750 if (assign_in_user(&p32->m.userptr, &p64->m.userptr)) 751 return -EFAULT; 752 break; 753 case V4L2_MEMORY_DMABUF: 754 if (assign_in_user(&p32->m.fd, &p64->m.fd)) 755 return -EFAULT; 756 break; 757 } 758 } 759 760 return 0; 761 } 762 763 struct v4l2_framebuffer32 { 764 __u32 capability; 765 __u32 flags; 766 compat_caddr_t base; 767 struct { 768 __u32 width; 769 __u32 height; 770 __u32 pixelformat; 771 __u32 field; 772 __u32 bytesperline; 773 __u32 sizeimage; 774 __u32 colorspace; 775 __u32 priv; 776 } fmt; 777 }; 778 779 static int get_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64, 780 struct v4l2_framebuffer32 __user *p32) 781 { 782 compat_caddr_t tmp; 783 784 if (!access_ok(p32, sizeof(*p32)) || 785 get_user(tmp, &p32->base) || 786 put_user_force(compat_ptr(tmp), &p64->base) || 787 assign_in_user(&p64->capability, &p32->capability) || 788 assign_in_user(&p64->flags, &p32->flags) || 789 copy_in_user(&p64->fmt, &p32->fmt, sizeof(p64->fmt))) 790 return -EFAULT; 791 return 0; 792 } 793 794 static int put_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64, 795 struct v4l2_framebuffer32 __user *p32) 796 { 797 void *base; 798 799 if (!access_ok(p32, sizeof(*p32)) || 800 get_user(base, &p64->base) || 801 put_user(ptr_to_compat((void __user *)base), &p32->base) || 802 assign_in_user(&p32->capability, &p64->capability) || 803 assign_in_user(&p32->flags, &p64->flags) || 804 copy_in_user(&p32->fmt, &p64->fmt, sizeof(p64->fmt))) 805 return -EFAULT; 806 return 0; 807 } 808 809 struct v4l2_input32 { 810 __u32 index; /* Which input */ 811 __u8 name[32]; /* Label */ 812 __u32 type; /* Type of input */ 813 __u32 audioset; /* Associated audios (bitfield) */ 814 __u32 tuner; /* Associated tuner */ 815 compat_u64 std; 816 __u32 status; 817 __u32 capabilities; 818 __u32 reserved[3]; 819 }; 820 821 /* 822 * The 64-bit v4l2_input struct has extra padding at the end of the struct. 823 * Otherwise it is identical to the 32-bit version. 824 */ 825 static inline int get_v4l2_input32(struct v4l2_input __user *p64, 826 struct v4l2_input32 __user *p32) 827 { 828 if (copy_in_user(p64, p32, sizeof(*p32))) 829 return -EFAULT; 830 return 0; 831 } 832 833 static inline int put_v4l2_input32(struct v4l2_input __user *p64, 834 struct v4l2_input32 __user *p32) 835 { 836 if (copy_in_user(p32, p64, sizeof(*p32))) 837 return -EFAULT; 838 return 0; 839 } 840 841 struct v4l2_ext_controls32 { 842 __u32 which; 843 __u32 count; 844 __u32 error_idx; 845 __s32 request_fd; 846 __u32 reserved[1]; 847 compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */ 848 }; 849 850 struct v4l2_ext_control32 { 851 __u32 id; 852 __u32 size; 853 __u32 reserved2[1]; 854 union { 855 __s32 value; 856 __s64 value64; 857 compat_caddr_t string; /* actually char * */ 858 }; 859 } __attribute__ ((packed)); 860 861 /* Return true if this control is a pointer type. */ 862 static inline bool ctrl_is_pointer(struct file *file, u32 id) 863 { 864 struct video_device *vdev = video_devdata(file); 865 struct v4l2_fh *fh = NULL; 866 struct v4l2_ctrl_handler *hdl = NULL; 867 struct v4l2_query_ext_ctrl qec = { id }; 868 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; 869 870 if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags)) 871 fh = file->private_data; 872 873 if (fh && fh->ctrl_handler) 874 hdl = fh->ctrl_handler; 875 else if (vdev->ctrl_handler) 876 hdl = vdev->ctrl_handler; 877 878 if (hdl) { 879 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id); 880 881 return ctrl && ctrl->is_ptr; 882 } 883 884 if (!ops || !ops->vidioc_query_ext_ctrl) 885 return false; 886 887 return !ops->vidioc_query_ext_ctrl(file, fh, &qec) && 888 (qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD); 889 } 890 891 static int bufsize_v4l2_ext_controls(struct v4l2_ext_controls32 __user *p32, 892 u32 *size) 893 { 894 u32 count; 895 896 if (!access_ok(p32, sizeof(*p32)) || 897 get_user(count, &p32->count)) 898 return -EFAULT; 899 if (count > V4L2_CID_MAX_CTRLS) 900 return -EINVAL; 901 *size = count * sizeof(struct v4l2_ext_control); 902 return 0; 903 } 904 905 static int get_v4l2_ext_controls32(struct file *file, 906 struct v4l2_ext_controls __user *p64, 907 struct v4l2_ext_controls32 __user *p32, 908 void __user *aux_buf, u32 aux_space) 909 { 910 struct v4l2_ext_control32 __user *ucontrols; 911 struct v4l2_ext_control __user *kcontrols; 912 u32 count; 913 u32 n; 914 compat_caddr_t p; 915 916 if (!access_ok(p32, sizeof(*p32)) || 917 assign_in_user(&p64->which, &p32->which) || 918 get_user(count, &p32->count) || 919 put_user(count, &p64->count) || 920 assign_in_user(&p64->error_idx, &p32->error_idx) || 921 assign_in_user(&p64->request_fd, &p32->request_fd) || 922 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved))) 923 return -EFAULT; 924 925 if (count == 0) 926 return put_user(NULL, &p64->controls); 927 if (count > V4L2_CID_MAX_CTRLS) 928 return -EINVAL; 929 if (get_user(p, &p32->controls)) 930 return -EFAULT; 931 ucontrols = compat_ptr(p); 932 if (!access_ok(ucontrols, count * sizeof(*ucontrols))) 933 return -EFAULT; 934 if (aux_space < count * sizeof(*kcontrols)) 935 return -EFAULT; 936 kcontrols = aux_buf; 937 if (put_user_force(kcontrols, &p64->controls)) 938 return -EFAULT; 939 940 for (n = 0; n < count; n++) { 941 u32 id; 942 943 if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols))) 944 return -EFAULT; 945 946 if (get_user(id, &kcontrols->id)) 947 return -EFAULT; 948 949 if (ctrl_is_pointer(file, id)) { 950 void __user *s; 951 952 if (get_user(p, &ucontrols->string)) 953 return -EFAULT; 954 s = compat_ptr(p); 955 if (put_user(s, &kcontrols->string)) 956 return -EFAULT; 957 } 958 ucontrols++; 959 kcontrols++; 960 } 961 return 0; 962 } 963 964 static int put_v4l2_ext_controls32(struct file *file, 965 struct v4l2_ext_controls __user *p64, 966 struct v4l2_ext_controls32 __user *p32) 967 { 968 struct v4l2_ext_control32 __user *ucontrols; 969 struct v4l2_ext_control *kcontrols; 970 u32 count; 971 u32 n; 972 compat_caddr_t p; 973 974 /* 975 * We need to define kcontrols without __user, even though it does 976 * point to data in userspace here. The reason is that v4l2-ioctl.c 977 * copies it from userspace to kernelspace, so its definition in 978 * videodev2.h doesn't have a __user markup. Defining kcontrols 979 * with __user causes smatch warnings, so instead declare it 980 * without __user and cast it as a userspace pointer where needed. 981 */ 982 if (!access_ok(p32, sizeof(*p32)) || 983 assign_in_user(&p32->which, &p64->which) || 984 get_user(count, &p64->count) || 985 put_user(count, &p32->count) || 986 assign_in_user(&p32->error_idx, &p64->error_idx) || 987 assign_in_user(&p32->request_fd, &p64->request_fd) || 988 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)) || 989 get_user(kcontrols, &p64->controls)) 990 return -EFAULT; 991 992 if (!count || count > (U32_MAX/sizeof(*ucontrols))) 993 return 0; 994 if (get_user(p, &p32->controls)) 995 return -EFAULT; 996 ucontrols = compat_ptr(p); 997 if (!access_ok(ucontrols, count * sizeof(*ucontrols))) 998 return -EFAULT; 999 1000 for (n = 0; n < count; n++) { 1001 unsigned int size = sizeof(*ucontrols); 1002 u32 id; 1003 1004 if (get_user_cast(id, &kcontrols->id) || 1005 put_user(id, &ucontrols->id) || 1006 assign_in_user_cast(&ucontrols->size, &kcontrols->size) || 1007 copy_in_user(&ucontrols->reserved2, 1008 (void __user *)&kcontrols->reserved2, 1009 sizeof(ucontrols->reserved2))) 1010 return -EFAULT; 1011 1012 /* 1013 * Do not modify the pointer when copying a pointer control. 1014 * The contents of the pointer was changed, not the pointer 1015 * itself. 1016 */ 1017 if (ctrl_is_pointer(file, id)) 1018 size -= sizeof(ucontrols->value64); 1019 1020 if (copy_in_user(ucontrols, 1021 (void __user *)kcontrols, size)) 1022 return -EFAULT; 1023 1024 ucontrols++; 1025 kcontrols++; 1026 } 1027 return 0; 1028 } 1029 1030 struct v4l2_event32 { 1031 __u32 type; 1032 union { 1033 compat_s64 value64; 1034 __u8 data[64]; 1035 } u; 1036 __u32 pending; 1037 __u32 sequence; 1038 struct compat_timespec timestamp; 1039 __u32 id; 1040 __u32 reserved[8]; 1041 }; 1042 1043 static int put_v4l2_event32(struct v4l2_event __user *p64, 1044 struct v4l2_event32 __user *p32) 1045 { 1046 if (!access_ok(p32, sizeof(*p32)) || 1047 assign_in_user(&p32->type, &p64->type) || 1048 copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) || 1049 assign_in_user(&p32->pending, &p64->pending) || 1050 assign_in_user(&p32->sequence, &p64->sequence) || 1051 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || 1052 assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) || 1053 assign_in_user(&p32->id, &p64->id) || 1054 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 1055 return -EFAULT; 1056 return 0; 1057 } 1058 1059 struct v4l2_edid32 { 1060 __u32 pad; 1061 __u32 start_block; 1062 __u32 blocks; 1063 __u32 reserved[5]; 1064 compat_caddr_t edid; 1065 }; 1066 1067 static int get_v4l2_edid32(struct v4l2_edid __user *p64, 1068 struct v4l2_edid32 __user *p32) 1069 { 1070 compat_uptr_t tmp; 1071 1072 if (!access_ok(p32, sizeof(*p32)) || 1073 assign_in_user(&p64->pad, &p32->pad) || 1074 assign_in_user(&p64->start_block, &p32->start_block) || 1075 assign_in_user_cast(&p64->blocks, &p32->blocks) || 1076 get_user(tmp, &p32->edid) || 1077 put_user_force(compat_ptr(tmp), &p64->edid) || 1078 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved))) 1079 return -EFAULT; 1080 return 0; 1081 } 1082 1083 static int put_v4l2_edid32(struct v4l2_edid __user *p64, 1084 struct v4l2_edid32 __user *p32) 1085 { 1086 void *edid; 1087 1088 if (!access_ok(p32, sizeof(*p32)) || 1089 assign_in_user(&p32->pad, &p64->pad) || 1090 assign_in_user(&p32->start_block, &p64->start_block) || 1091 assign_in_user(&p32->blocks, &p64->blocks) || 1092 get_user(edid, &p64->edid) || 1093 put_user(ptr_to_compat((void __user *)edid), &p32->edid) || 1094 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 1095 return -EFAULT; 1096 return 0; 1097 } 1098 1099 /* 1100 * List of ioctls that require 32-bits/64-bits conversion 1101 * 1102 * The V4L2 ioctls that aren't listed there don't have pointer arguments 1103 * and the struct size is identical for both 32 and 64 bits versions, so 1104 * they don't need translations. 1105 */ 1106 1107 #define VIDIOC_G_FMT32 _IOWR('V', 4, struct v4l2_format32) 1108 #define VIDIOC_S_FMT32 _IOWR('V', 5, struct v4l2_format32) 1109 #define VIDIOC_QUERYBUF32 _IOWR('V', 9, struct v4l2_buffer32) 1110 #define VIDIOC_G_FBUF32 _IOR ('V', 10, struct v4l2_framebuffer32) 1111 #define VIDIOC_S_FBUF32 _IOW ('V', 11, struct v4l2_framebuffer32) 1112 #define VIDIOC_QBUF32 _IOWR('V', 15, struct v4l2_buffer32) 1113 #define VIDIOC_DQBUF32 _IOWR('V', 17, struct v4l2_buffer32) 1114 #define VIDIOC_ENUMSTD32 _IOWR('V', 25, struct v4l2_standard32) 1115 #define VIDIOC_ENUMINPUT32 _IOWR('V', 26, struct v4l2_input32) 1116 #define VIDIOC_G_EDID32 _IOWR('V', 40, struct v4l2_edid32) 1117 #define VIDIOC_S_EDID32 _IOWR('V', 41, struct v4l2_edid32) 1118 #define VIDIOC_TRY_FMT32 _IOWR('V', 64, struct v4l2_format32) 1119 #define VIDIOC_G_EXT_CTRLS32 _IOWR('V', 71, struct v4l2_ext_controls32) 1120 #define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32) 1121 #define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32) 1122 #define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32) 1123 #define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32) 1124 #define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32) 1125 1126 #define VIDIOC_OVERLAY32 _IOW ('V', 14, s32) 1127 #define VIDIOC_STREAMON32 _IOW ('V', 18, s32) 1128 #define VIDIOC_STREAMOFF32 _IOW ('V', 19, s32) 1129 #define VIDIOC_G_INPUT32 _IOR ('V', 38, s32) 1130 #define VIDIOC_S_INPUT32 _IOWR('V', 39, s32) 1131 #define VIDIOC_G_OUTPUT32 _IOR ('V', 46, s32) 1132 #define VIDIOC_S_OUTPUT32 _IOWR('V', 47, s32) 1133 1134 /** 1135 * alloc_userspace() - Allocates a 64-bits userspace pointer compatible 1136 * for calling the native 64-bits version of an ioctl. 1137 * 1138 * @size: size of the structure itself to be allocated. 1139 * @aux_space: extra size needed to store "extra" data, e.g. space for 1140 * other __user data that is pointed to fields inside the 1141 * structure. 1142 * @new_p64: pointer to a pointer to be filled with the allocated struct. 1143 * 1144 * Return: 1145 * 1146 * if it can't allocate memory, either -ENOMEM or -EFAULT will be returned. 1147 * Zero otherwise. 1148 */ 1149 static int alloc_userspace(unsigned int size, u32 aux_space, 1150 void __user **new_p64) 1151 { 1152 *new_p64 = compat_alloc_user_space(size + aux_space); 1153 if (!*new_p64) 1154 return -ENOMEM; 1155 if (clear_user(*new_p64, size)) 1156 return -EFAULT; 1157 return 0; 1158 } 1159 1160 /** 1161 * do_video_ioctl() - Ancillary function with handles a compat32 ioctl call 1162 * 1163 * @file: pointer to &struct file with the file handler 1164 * @cmd: ioctl to be called 1165 * @arg: arguments passed from/to the ioctl handler 1166 * 1167 * This function is called when a 32 bits application calls a V4L2 ioctl 1168 * and the Kernel is compiled with 64 bits. 1169 * 1170 * This function is called by v4l2_compat_ioctl32() when the function is 1171 * not private to some specific driver. 1172 * 1173 * It converts a 32-bits struct into a 64 bits one, calls the native 64-bits 1174 * ioctl handler and fills back the 32-bits struct with the results of the 1175 * native call. 1176 */ 1177 static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1178 { 1179 void __user *p32 = compat_ptr(arg); 1180 void __user *new_p64 = NULL; 1181 void __user *aux_buf; 1182 u32 aux_space; 1183 int compatible_arg = 1; 1184 long err = 0; 1185 1186 /* 1187 * 1. When struct size is different, converts the command. 1188 */ 1189 switch (cmd) { 1190 case VIDIOC_G_FMT32: cmd = VIDIOC_G_FMT; break; 1191 case VIDIOC_S_FMT32: cmd = VIDIOC_S_FMT; break; 1192 case VIDIOC_QUERYBUF32: cmd = VIDIOC_QUERYBUF; break; 1193 case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break; 1194 case VIDIOC_S_FBUF32: cmd = VIDIOC_S_FBUF; break; 1195 case VIDIOC_QBUF32: cmd = VIDIOC_QBUF; break; 1196 case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break; 1197 case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break; 1198 case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break; 1199 case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break; 1200 case VIDIOC_G_EXT_CTRLS32: cmd = VIDIOC_G_EXT_CTRLS; break; 1201 case VIDIOC_S_EXT_CTRLS32: cmd = VIDIOC_S_EXT_CTRLS; break; 1202 case VIDIOC_TRY_EXT_CTRLS32: cmd = VIDIOC_TRY_EXT_CTRLS; break; 1203 case VIDIOC_DQEVENT32: cmd = VIDIOC_DQEVENT; break; 1204 case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break; 1205 case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break; 1206 case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break; 1207 case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break; 1208 case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break; 1209 case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break; 1210 case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break; 1211 case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break; 1212 case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break; 1213 case VIDIOC_G_EDID32: cmd = VIDIOC_G_EDID; break; 1214 case VIDIOC_S_EDID32: cmd = VIDIOC_S_EDID; break; 1215 } 1216 1217 /* 1218 * 2. Allocates a 64-bits userspace pointer to store the 1219 * values of the ioctl and copy data from the 32-bits __user 1220 * argument into it. 1221 */ 1222 switch (cmd) { 1223 case VIDIOC_OVERLAY: 1224 case VIDIOC_STREAMON: 1225 case VIDIOC_STREAMOFF: 1226 case VIDIOC_S_INPUT: 1227 case VIDIOC_S_OUTPUT: 1228 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64); 1229 if (!err && assign_in_user((unsigned int __user *)new_p64, 1230 (compat_uint_t __user *)p32)) 1231 err = -EFAULT; 1232 compatible_arg = 0; 1233 break; 1234 1235 case VIDIOC_G_INPUT: 1236 case VIDIOC_G_OUTPUT: 1237 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64); 1238 compatible_arg = 0; 1239 break; 1240 1241 case VIDIOC_G_EDID: 1242 case VIDIOC_S_EDID: 1243 err = alloc_userspace(sizeof(struct v4l2_edid), 0, &new_p64); 1244 if (!err) 1245 err = get_v4l2_edid32(new_p64, p32); 1246 compatible_arg = 0; 1247 break; 1248 1249 case VIDIOC_G_FMT: 1250 case VIDIOC_S_FMT: 1251 case VIDIOC_TRY_FMT: 1252 err = bufsize_v4l2_format(p32, &aux_space); 1253 if (!err) 1254 err = alloc_userspace(sizeof(struct v4l2_format), 1255 aux_space, &new_p64); 1256 if (!err) { 1257 aux_buf = new_p64 + sizeof(struct v4l2_format); 1258 err = get_v4l2_format32(new_p64, p32, 1259 aux_buf, aux_space); 1260 } 1261 compatible_arg = 0; 1262 break; 1263 1264 case VIDIOC_CREATE_BUFS: 1265 err = bufsize_v4l2_create(p32, &aux_space); 1266 if (!err) 1267 err = alloc_userspace(sizeof(struct v4l2_create_buffers), 1268 aux_space, &new_p64); 1269 if (!err) { 1270 aux_buf = new_p64 + sizeof(struct v4l2_create_buffers); 1271 err = get_v4l2_create32(new_p64, p32, 1272 aux_buf, aux_space); 1273 } 1274 compatible_arg = 0; 1275 break; 1276 1277 case VIDIOC_PREPARE_BUF: 1278 case VIDIOC_QUERYBUF: 1279 case VIDIOC_QBUF: 1280 case VIDIOC_DQBUF: 1281 err = bufsize_v4l2_buffer(p32, &aux_space); 1282 if (!err) 1283 err = alloc_userspace(sizeof(struct v4l2_buffer), 1284 aux_space, &new_p64); 1285 if (!err) { 1286 aux_buf = new_p64 + sizeof(struct v4l2_buffer); 1287 err = get_v4l2_buffer32(new_p64, p32, 1288 aux_buf, aux_space); 1289 } 1290 compatible_arg = 0; 1291 break; 1292 1293 case VIDIOC_S_FBUF: 1294 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0, 1295 &new_p64); 1296 if (!err) 1297 err = get_v4l2_framebuffer32(new_p64, p32); 1298 compatible_arg = 0; 1299 break; 1300 1301 case VIDIOC_G_FBUF: 1302 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0, 1303 &new_p64); 1304 compatible_arg = 0; 1305 break; 1306 1307 case VIDIOC_ENUMSTD: 1308 err = alloc_userspace(sizeof(struct v4l2_standard), 0, 1309 &new_p64); 1310 if (!err) 1311 err = get_v4l2_standard32(new_p64, p32); 1312 compatible_arg = 0; 1313 break; 1314 1315 case VIDIOC_ENUMINPUT: 1316 err = alloc_userspace(sizeof(struct v4l2_input), 0, &new_p64); 1317 if (!err) 1318 err = get_v4l2_input32(new_p64, p32); 1319 compatible_arg = 0; 1320 break; 1321 1322 case VIDIOC_G_EXT_CTRLS: 1323 case VIDIOC_S_EXT_CTRLS: 1324 case VIDIOC_TRY_EXT_CTRLS: 1325 err = bufsize_v4l2_ext_controls(p32, &aux_space); 1326 if (!err) 1327 err = alloc_userspace(sizeof(struct v4l2_ext_controls), 1328 aux_space, &new_p64); 1329 if (!err) { 1330 aux_buf = new_p64 + sizeof(struct v4l2_ext_controls); 1331 err = get_v4l2_ext_controls32(file, new_p64, p32, 1332 aux_buf, aux_space); 1333 } 1334 compatible_arg = 0; 1335 break; 1336 case VIDIOC_DQEVENT: 1337 err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64); 1338 compatible_arg = 0; 1339 break; 1340 } 1341 if (err) 1342 return err; 1343 1344 /* 1345 * 3. Calls the native 64-bits ioctl handler. 1346 * 1347 * For the functions where a conversion was not needed, 1348 * compatible_arg is true, and it will call it with the arguments 1349 * provided by userspace and stored at @p32 var. 1350 * 1351 * Otherwise, it will pass the newly allocated @new_p64 argument. 1352 */ 1353 if (compatible_arg) 1354 err = native_ioctl(file, cmd, (unsigned long)p32); 1355 else 1356 err = native_ioctl(file, cmd, (unsigned long)new_p64); 1357 1358 if (err == -ENOTTY) 1359 return err; 1360 1361 /* 1362 * 4. Special case: even after an error we need to put the 1363 * results back for some ioctls. 1364 * 1365 * In the case of EXT_CTRLS, the error_idx will contain information 1366 * on which control failed. 1367 * 1368 * In the case of S_EDID, the driver can return E2BIG and set 1369 * the blocks to maximum allowed value. 1370 */ 1371 switch (cmd) { 1372 case VIDIOC_G_EXT_CTRLS: 1373 case VIDIOC_S_EXT_CTRLS: 1374 case VIDIOC_TRY_EXT_CTRLS: 1375 if (put_v4l2_ext_controls32(file, new_p64, p32)) 1376 err = -EFAULT; 1377 break; 1378 case VIDIOC_S_EDID: 1379 if (put_v4l2_edid32(new_p64, p32)) 1380 err = -EFAULT; 1381 break; 1382 } 1383 if (err) 1384 return err; 1385 1386 /* 1387 * 5. Copy the data returned at the 64 bits userspace pointer to 1388 * the original 32 bits structure. 1389 */ 1390 switch (cmd) { 1391 case VIDIOC_S_INPUT: 1392 case VIDIOC_S_OUTPUT: 1393 case VIDIOC_G_INPUT: 1394 case VIDIOC_G_OUTPUT: 1395 if (assign_in_user((compat_uint_t __user *)p32, 1396 ((unsigned int __user *)new_p64))) 1397 err = -EFAULT; 1398 break; 1399 1400 case VIDIOC_G_FBUF: 1401 err = put_v4l2_framebuffer32(new_p64, p32); 1402 break; 1403 1404 case VIDIOC_DQEVENT: 1405 err = put_v4l2_event32(new_p64, p32); 1406 break; 1407 1408 case VIDIOC_G_EDID: 1409 err = put_v4l2_edid32(new_p64, p32); 1410 break; 1411 1412 case VIDIOC_G_FMT: 1413 case VIDIOC_S_FMT: 1414 case VIDIOC_TRY_FMT: 1415 err = put_v4l2_format32(new_p64, p32); 1416 break; 1417 1418 case VIDIOC_CREATE_BUFS: 1419 err = put_v4l2_create32(new_p64, p32); 1420 break; 1421 1422 case VIDIOC_PREPARE_BUF: 1423 case VIDIOC_QUERYBUF: 1424 case VIDIOC_QBUF: 1425 case VIDIOC_DQBUF: 1426 err = put_v4l2_buffer32(new_p64, p32); 1427 break; 1428 1429 case VIDIOC_ENUMSTD: 1430 err = put_v4l2_standard32(new_p64, p32); 1431 break; 1432 1433 case VIDIOC_ENUMINPUT: 1434 err = put_v4l2_input32(new_p64, p32); 1435 break; 1436 } 1437 return err; 1438 } 1439 1440 /** 1441 * v4l2_compat_ioctl32() - Handles a compat32 ioctl call 1442 * 1443 * @file: pointer to &struct file with the file handler 1444 * @cmd: ioctl to be called 1445 * @arg: arguments passed from/to the ioctl handler 1446 * 1447 * This function is meant to be used as .compat_ioctl fops at v4l2-dev.c 1448 * in order to deal with 32-bit calls on a 64-bits Kernel. 1449 * 1450 * This function calls do_video_ioctl() for non-private V4L2 ioctls. 1451 * If the function is a private one it calls vdev->fops->compat_ioctl32 1452 * instead. 1453 */ 1454 long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg) 1455 { 1456 struct video_device *vdev = video_devdata(file); 1457 long ret = -ENOIOCTLCMD; 1458 1459 if (!file->f_op->unlocked_ioctl) 1460 return ret; 1461 1462 if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE) 1463 ret = do_video_ioctl(file, cmd, arg); 1464 else if (vdev->fops->compat_ioctl32) 1465 ret = vdev->fops->compat_ioctl32(file, cmd, arg); 1466 1467 if (ret == -ENOIOCTLCMD) 1468 pr_debug("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)\n", 1469 _IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd); 1470 return ret; 1471 } 1472 EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32); 1473