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 struct v4l2_buffer32 { 472 __u32 index; 473 __u32 type; /* enum v4l2_buf_type */ 474 __u32 bytesused; 475 __u32 flags; 476 __u32 field; /* enum v4l2_field */ 477 struct compat_timeval timestamp; 478 struct v4l2_timecode timecode; 479 __u32 sequence; 480 481 /* memory location */ 482 __u32 memory; /* enum v4l2_memory */ 483 union { 484 __u32 offset; 485 compat_long_t userptr; 486 compat_caddr_t planes; 487 __s32 fd; 488 } m; 489 __u32 length; 490 __u32 reserved2; 491 __s32 request_fd; 492 }; 493 494 static int get_v4l2_plane32(struct v4l2_plane __user *p64, 495 struct v4l2_plane32 __user *p32, 496 enum v4l2_memory memory) 497 { 498 compat_ulong_t p; 499 500 if (copy_in_user(p64, p32, 2 * sizeof(__u32)) || 501 copy_in_user(&p64->data_offset, &p32->data_offset, 502 sizeof(p64->data_offset))) 503 return -EFAULT; 504 505 switch (memory) { 506 case V4L2_MEMORY_MMAP: 507 case V4L2_MEMORY_OVERLAY: 508 if (copy_in_user(&p64->m.mem_offset, &p32->m.mem_offset, 509 sizeof(p32->m.mem_offset))) 510 return -EFAULT; 511 break; 512 case V4L2_MEMORY_USERPTR: 513 if (get_user(p, &p32->m.userptr) || 514 put_user((unsigned long)compat_ptr(p), &p64->m.userptr)) 515 return -EFAULT; 516 break; 517 case V4L2_MEMORY_DMABUF: 518 if (copy_in_user(&p64->m.fd, &p32->m.fd, sizeof(p32->m.fd))) 519 return -EFAULT; 520 break; 521 } 522 523 return 0; 524 } 525 526 static int put_v4l2_plane32(struct v4l2_plane __user *p64, 527 struct v4l2_plane32 __user *p32, 528 enum v4l2_memory memory) 529 { 530 unsigned long p; 531 532 if (copy_in_user(p32, p64, 2 * sizeof(__u32)) || 533 copy_in_user(&p32->data_offset, &p64->data_offset, 534 sizeof(p64->data_offset))) 535 return -EFAULT; 536 537 switch (memory) { 538 case V4L2_MEMORY_MMAP: 539 case V4L2_MEMORY_OVERLAY: 540 if (copy_in_user(&p32->m.mem_offset, &p64->m.mem_offset, 541 sizeof(p64->m.mem_offset))) 542 return -EFAULT; 543 break; 544 case V4L2_MEMORY_USERPTR: 545 if (get_user(p, &p64->m.userptr) || 546 put_user((compat_ulong_t)ptr_to_compat((void __user *)p), 547 &p32->m.userptr)) 548 return -EFAULT; 549 break; 550 case V4L2_MEMORY_DMABUF: 551 if (copy_in_user(&p32->m.fd, &p64->m.fd, sizeof(p64->m.fd))) 552 return -EFAULT; 553 break; 554 } 555 556 return 0; 557 } 558 559 static int bufsize_v4l2_buffer(struct v4l2_buffer32 __user *p32, u32 *size) 560 { 561 u32 type; 562 u32 length; 563 564 if (!access_ok(p32, sizeof(*p32)) || 565 get_user(type, &p32->type) || 566 get_user(length, &p32->length)) 567 return -EFAULT; 568 569 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 570 if (length > VIDEO_MAX_PLANES) 571 return -EINVAL; 572 573 /* 574 * We don't really care if userspace decides to kill itself 575 * by passing a very big length value 576 */ 577 *size = length * sizeof(struct v4l2_plane); 578 } else { 579 *size = 0; 580 } 581 return 0; 582 } 583 584 static int get_v4l2_buffer32(struct v4l2_buffer __user *p64, 585 struct v4l2_buffer32 __user *p32, 586 void __user *aux_buf, u32 aux_space) 587 { 588 u32 type; 589 u32 length; 590 s32 request_fd; 591 enum v4l2_memory memory; 592 struct v4l2_plane32 __user *uplane32; 593 struct v4l2_plane __user *uplane; 594 compat_caddr_t p; 595 int ret; 596 597 if (!access_ok(p32, sizeof(*p32)) || 598 assign_in_user(&p64->index, &p32->index) || 599 get_user(type, &p32->type) || 600 put_user(type, &p64->type) || 601 assign_in_user(&p64->flags, &p32->flags) || 602 get_user(memory, &p32->memory) || 603 put_user(memory, &p64->memory) || 604 get_user(length, &p32->length) || 605 put_user(length, &p64->length) || 606 get_user(request_fd, &p32->request_fd) || 607 put_user(request_fd, &p64->request_fd)) 608 return -EFAULT; 609 610 if (V4L2_TYPE_IS_OUTPUT(type)) 611 if (assign_in_user(&p64->bytesused, &p32->bytesused) || 612 assign_in_user(&p64->field, &p32->field) || 613 assign_in_user(&p64->timestamp.tv_sec, 614 &p32->timestamp.tv_sec) || 615 assign_in_user(&p64->timestamp.tv_usec, 616 &p32->timestamp.tv_usec)) 617 return -EFAULT; 618 619 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 620 u32 num_planes = length; 621 622 if (num_planes == 0) { 623 /* 624 * num_planes == 0 is legal, e.g. when userspace doesn't 625 * need planes array on DQBUF 626 */ 627 return put_user(NULL, &p64->m.planes); 628 } 629 if (num_planes > VIDEO_MAX_PLANES) 630 return -EINVAL; 631 632 if (get_user(p, &p32->m.planes)) 633 return -EFAULT; 634 635 uplane32 = compat_ptr(p); 636 if (!access_ok(uplane32, 637 num_planes * sizeof(*uplane32))) 638 return -EFAULT; 639 640 /* 641 * We don't really care if userspace decides to kill itself 642 * by passing a very big num_planes value 643 */ 644 if (aux_space < num_planes * sizeof(*uplane)) 645 return -EFAULT; 646 647 uplane = aux_buf; 648 if (put_user_force(uplane, &p64->m.planes)) 649 return -EFAULT; 650 651 while (num_planes--) { 652 ret = get_v4l2_plane32(uplane, uplane32, memory); 653 if (ret) 654 return ret; 655 uplane++; 656 uplane32++; 657 } 658 } else { 659 switch (memory) { 660 case V4L2_MEMORY_MMAP: 661 case V4L2_MEMORY_OVERLAY: 662 if (assign_in_user(&p64->m.offset, &p32->m.offset)) 663 return -EFAULT; 664 break; 665 case V4L2_MEMORY_USERPTR: { 666 compat_ulong_t userptr; 667 668 if (get_user(userptr, &p32->m.userptr) || 669 put_user((unsigned long)compat_ptr(userptr), 670 &p64->m.userptr)) 671 return -EFAULT; 672 break; 673 } 674 case V4L2_MEMORY_DMABUF: 675 if (assign_in_user(&p64->m.fd, &p32->m.fd)) 676 return -EFAULT; 677 break; 678 } 679 } 680 681 return 0; 682 } 683 684 static int put_v4l2_buffer32(struct v4l2_buffer __user *p64, 685 struct v4l2_buffer32 __user *p32) 686 { 687 u32 type; 688 u32 length; 689 enum v4l2_memory memory; 690 struct v4l2_plane32 __user *uplane32; 691 struct v4l2_plane *uplane; 692 compat_caddr_t p; 693 int ret; 694 695 if (!access_ok(p32, sizeof(*p32)) || 696 assign_in_user(&p32->index, &p64->index) || 697 get_user(type, &p64->type) || 698 put_user(type, &p32->type) || 699 assign_in_user(&p32->flags, &p64->flags) || 700 get_user(memory, &p64->memory) || 701 put_user(memory, &p32->memory)) 702 return -EFAULT; 703 704 if (assign_in_user(&p32->bytesused, &p64->bytesused) || 705 assign_in_user(&p32->field, &p64->field) || 706 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || 707 assign_in_user(&p32->timestamp.tv_usec, &p64->timestamp.tv_usec) || 708 copy_in_user(&p32->timecode, &p64->timecode, sizeof(p64->timecode)) || 709 assign_in_user(&p32->sequence, &p64->sequence) || 710 assign_in_user(&p32->reserved2, &p64->reserved2) || 711 assign_in_user(&p32->request_fd, &p64->request_fd) || 712 get_user(length, &p64->length) || 713 put_user(length, &p32->length)) 714 return -EFAULT; 715 716 if (V4L2_TYPE_IS_MULTIPLANAR(type)) { 717 u32 num_planes = length; 718 719 if (num_planes == 0) 720 return 0; 721 /* We need to define uplane without __user, even though 722 * it does point to data in userspace here. The reason is 723 * that v4l2-ioctl.c copies it from userspace to kernelspace, 724 * so its definition in videodev2.h doesn't have a 725 * __user markup. Defining uplane with __user causes 726 * smatch warnings, so instead declare it without __user 727 * and cast it as a userspace pointer to put_v4l2_plane32(). 728 */ 729 if (get_user(uplane, &p64->m.planes)) 730 return -EFAULT; 731 if (get_user(p, &p32->m.planes)) 732 return -EFAULT; 733 uplane32 = compat_ptr(p); 734 735 while (num_planes--) { 736 ret = put_v4l2_plane32((void __user *)uplane, 737 uplane32, memory); 738 if (ret) 739 return ret; 740 ++uplane; 741 ++uplane32; 742 } 743 } else { 744 switch (memory) { 745 case V4L2_MEMORY_MMAP: 746 case V4L2_MEMORY_OVERLAY: 747 if (assign_in_user(&p32->m.offset, &p64->m.offset)) 748 return -EFAULT; 749 break; 750 case V4L2_MEMORY_USERPTR: 751 if (assign_in_user(&p32->m.userptr, &p64->m.userptr)) 752 return -EFAULT; 753 break; 754 case V4L2_MEMORY_DMABUF: 755 if (assign_in_user(&p32->m.fd, &p64->m.fd)) 756 return -EFAULT; 757 break; 758 } 759 } 760 761 return 0; 762 } 763 764 struct v4l2_framebuffer32 { 765 __u32 capability; 766 __u32 flags; 767 compat_caddr_t base; 768 struct { 769 __u32 width; 770 __u32 height; 771 __u32 pixelformat; 772 __u32 field; 773 __u32 bytesperline; 774 __u32 sizeimage; 775 __u32 colorspace; 776 __u32 priv; 777 } fmt; 778 }; 779 780 static int get_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64, 781 struct v4l2_framebuffer32 __user *p32) 782 { 783 compat_caddr_t tmp; 784 785 if (!access_ok(p32, sizeof(*p32)) || 786 get_user(tmp, &p32->base) || 787 put_user_force(compat_ptr(tmp), &p64->base) || 788 assign_in_user(&p64->capability, &p32->capability) || 789 assign_in_user(&p64->flags, &p32->flags) || 790 copy_in_user(&p64->fmt, &p32->fmt, sizeof(p64->fmt))) 791 return -EFAULT; 792 return 0; 793 } 794 795 static int put_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64, 796 struct v4l2_framebuffer32 __user *p32) 797 { 798 void *base; 799 800 if (!access_ok(p32, sizeof(*p32)) || 801 get_user(base, &p64->base) || 802 put_user(ptr_to_compat((void __user *)base), &p32->base) || 803 assign_in_user(&p32->capability, &p64->capability) || 804 assign_in_user(&p32->flags, &p64->flags) || 805 copy_in_user(&p32->fmt, &p64->fmt, sizeof(p64->fmt))) 806 return -EFAULT; 807 return 0; 808 } 809 810 struct v4l2_input32 { 811 __u32 index; /* Which input */ 812 __u8 name[32]; /* Label */ 813 __u32 type; /* Type of input */ 814 __u32 audioset; /* Associated audios (bitfield) */ 815 __u32 tuner; /* Associated tuner */ 816 compat_u64 std; 817 __u32 status; 818 __u32 capabilities; 819 __u32 reserved[3]; 820 }; 821 822 /* 823 * The 64-bit v4l2_input struct has extra padding at the end of the struct. 824 * Otherwise it is identical to the 32-bit version. 825 */ 826 static inline int get_v4l2_input32(struct v4l2_input __user *p64, 827 struct v4l2_input32 __user *p32) 828 { 829 if (copy_in_user(p64, p32, sizeof(*p32))) 830 return -EFAULT; 831 return 0; 832 } 833 834 static inline int put_v4l2_input32(struct v4l2_input __user *p64, 835 struct v4l2_input32 __user *p32) 836 { 837 if (copy_in_user(p32, p64, sizeof(*p32))) 838 return -EFAULT; 839 return 0; 840 } 841 842 struct v4l2_ext_controls32 { 843 __u32 which; 844 __u32 count; 845 __u32 error_idx; 846 __s32 request_fd; 847 __u32 reserved[1]; 848 compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */ 849 }; 850 851 struct v4l2_ext_control32 { 852 __u32 id; 853 __u32 size; 854 __u32 reserved2[1]; 855 union { 856 __s32 value; 857 __s64 value64; 858 compat_caddr_t string; /* actually char * */ 859 }; 860 } __attribute__ ((packed)); 861 862 /* Return true if this control is a pointer type. */ 863 static inline bool ctrl_is_pointer(struct file *file, u32 id) 864 { 865 struct video_device *vdev = video_devdata(file); 866 struct v4l2_fh *fh = NULL; 867 struct v4l2_ctrl_handler *hdl = NULL; 868 struct v4l2_query_ext_ctrl qec = { id }; 869 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; 870 871 if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags)) 872 fh = file->private_data; 873 874 if (fh && fh->ctrl_handler) 875 hdl = fh->ctrl_handler; 876 else if (vdev->ctrl_handler) 877 hdl = vdev->ctrl_handler; 878 879 if (hdl) { 880 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id); 881 882 return ctrl && ctrl->is_ptr; 883 } 884 885 if (!ops || !ops->vidioc_query_ext_ctrl) 886 return false; 887 888 return !ops->vidioc_query_ext_ctrl(file, fh, &qec) && 889 (qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD); 890 } 891 892 static int bufsize_v4l2_ext_controls(struct v4l2_ext_controls32 __user *p32, 893 u32 *size) 894 { 895 u32 count; 896 897 if (!access_ok(p32, sizeof(*p32)) || 898 get_user(count, &p32->count)) 899 return -EFAULT; 900 if (count > V4L2_CID_MAX_CTRLS) 901 return -EINVAL; 902 *size = count * sizeof(struct v4l2_ext_control); 903 return 0; 904 } 905 906 static int get_v4l2_ext_controls32(struct file *file, 907 struct v4l2_ext_controls __user *p64, 908 struct v4l2_ext_controls32 __user *p32, 909 void __user *aux_buf, u32 aux_space) 910 { 911 struct v4l2_ext_control32 __user *ucontrols; 912 struct v4l2_ext_control __user *kcontrols; 913 u32 count; 914 u32 n; 915 compat_caddr_t p; 916 917 if (!access_ok(p32, sizeof(*p32)) || 918 assign_in_user(&p64->which, &p32->which) || 919 get_user(count, &p32->count) || 920 put_user(count, &p64->count) || 921 assign_in_user(&p64->error_idx, &p32->error_idx) || 922 assign_in_user(&p64->request_fd, &p32->request_fd) || 923 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved))) 924 return -EFAULT; 925 926 if (count == 0) 927 return put_user(NULL, &p64->controls); 928 if (count > V4L2_CID_MAX_CTRLS) 929 return -EINVAL; 930 if (get_user(p, &p32->controls)) 931 return -EFAULT; 932 ucontrols = compat_ptr(p); 933 if (!access_ok(ucontrols, count * sizeof(*ucontrols))) 934 return -EFAULT; 935 if (aux_space < count * sizeof(*kcontrols)) 936 return -EFAULT; 937 kcontrols = aux_buf; 938 if (put_user_force(kcontrols, &p64->controls)) 939 return -EFAULT; 940 941 for (n = 0; n < count; n++) { 942 u32 id; 943 944 if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols))) 945 return -EFAULT; 946 947 if (get_user(id, &kcontrols->id)) 948 return -EFAULT; 949 950 if (ctrl_is_pointer(file, id)) { 951 void __user *s; 952 953 if (get_user(p, &ucontrols->string)) 954 return -EFAULT; 955 s = compat_ptr(p); 956 if (put_user(s, &kcontrols->string)) 957 return -EFAULT; 958 } 959 ucontrols++; 960 kcontrols++; 961 } 962 return 0; 963 } 964 965 static int put_v4l2_ext_controls32(struct file *file, 966 struct v4l2_ext_controls __user *p64, 967 struct v4l2_ext_controls32 __user *p32) 968 { 969 struct v4l2_ext_control32 __user *ucontrols; 970 struct v4l2_ext_control *kcontrols; 971 u32 count; 972 u32 n; 973 compat_caddr_t p; 974 975 /* 976 * We need to define kcontrols without __user, even though it does 977 * point to data in userspace here. The reason is that v4l2-ioctl.c 978 * copies it from userspace to kernelspace, so its definition in 979 * videodev2.h doesn't have a __user markup. Defining kcontrols 980 * with __user causes smatch warnings, so instead declare it 981 * without __user and cast it as a userspace pointer where needed. 982 */ 983 if (!access_ok(p32, sizeof(*p32)) || 984 assign_in_user(&p32->which, &p64->which) || 985 get_user(count, &p64->count) || 986 put_user(count, &p32->count) || 987 assign_in_user(&p32->error_idx, &p64->error_idx) || 988 assign_in_user(&p32->request_fd, &p64->request_fd) || 989 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)) || 990 get_user(kcontrols, &p64->controls)) 991 return -EFAULT; 992 993 if (!count || count > (U32_MAX/sizeof(*ucontrols))) 994 return 0; 995 if (get_user(p, &p32->controls)) 996 return -EFAULT; 997 ucontrols = compat_ptr(p); 998 if (!access_ok(ucontrols, count * sizeof(*ucontrols))) 999 return -EFAULT; 1000 1001 for (n = 0; n < count; n++) { 1002 unsigned int size = sizeof(*ucontrols); 1003 u32 id; 1004 1005 if (get_user_cast(id, &kcontrols->id) || 1006 put_user(id, &ucontrols->id) || 1007 assign_in_user_cast(&ucontrols->size, &kcontrols->size) || 1008 copy_in_user(&ucontrols->reserved2, 1009 (void __user *)&kcontrols->reserved2, 1010 sizeof(ucontrols->reserved2))) 1011 return -EFAULT; 1012 1013 /* 1014 * Do not modify the pointer when copying a pointer control. 1015 * The contents of the pointer was changed, not the pointer 1016 * itself. 1017 */ 1018 if (ctrl_is_pointer(file, id)) 1019 size -= sizeof(ucontrols->value64); 1020 1021 if (copy_in_user(ucontrols, 1022 (void __user *)kcontrols, size)) 1023 return -EFAULT; 1024 1025 ucontrols++; 1026 kcontrols++; 1027 } 1028 return 0; 1029 } 1030 1031 struct v4l2_event32 { 1032 __u32 type; 1033 union { 1034 compat_s64 value64; 1035 __u8 data[64]; 1036 } u; 1037 __u32 pending; 1038 __u32 sequence; 1039 struct compat_timespec timestamp; 1040 __u32 id; 1041 __u32 reserved[8]; 1042 }; 1043 1044 static int put_v4l2_event32(struct v4l2_event __user *p64, 1045 struct v4l2_event32 __user *p32) 1046 { 1047 if (!access_ok(p32, sizeof(*p32)) || 1048 assign_in_user(&p32->type, &p64->type) || 1049 copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) || 1050 assign_in_user(&p32->pending, &p64->pending) || 1051 assign_in_user(&p32->sequence, &p64->sequence) || 1052 assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || 1053 assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) || 1054 assign_in_user(&p32->id, &p64->id) || 1055 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 1056 return -EFAULT; 1057 return 0; 1058 } 1059 1060 struct v4l2_edid32 { 1061 __u32 pad; 1062 __u32 start_block; 1063 __u32 blocks; 1064 __u32 reserved[5]; 1065 compat_caddr_t edid; 1066 }; 1067 1068 static int get_v4l2_edid32(struct v4l2_edid __user *p64, 1069 struct v4l2_edid32 __user *p32) 1070 { 1071 compat_uptr_t tmp; 1072 1073 if (!access_ok(p32, sizeof(*p32)) || 1074 assign_in_user(&p64->pad, &p32->pad) || 1075 assign_in_user(&p64->start_block, &p32->start_block) || 1076 assign_in_user_cast(&p64->blocks, &p32->blocks) || 1077 get_user(tmp, &p32->edid) || 1078 put_user_force(compat_ptr(tmp), &p64->edid) || 1079 copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved))) 1080 return -EFAULT; 1081 return 0; 1082 } 1083 1084 static int put_v4l2_edid32(struct v4l2_edid __user *p64, 1085 struct v4l2_edid32 __user *p32) 1086 { 1087 void *edid; 1088 1089 if (!access_ok(p32, sizeof(*p32)) || 1090 assign_in_user(&p32->pad, &p64->pad) || 1091 assign_in_user(&p32->start_block, &p64->start_block) || 1092 assign_in_user(&p32->blocks, &p64->blocks) || 1093 get_user(edid, &p64->edid) || 1094 put_user(ptr_to_compat((void __user *)edid), &p32->edid) || 1095 copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) 1096 return -EFAULT; 1097 return 0; 1098 } 1099 1100 /* 1101 * List of ioctls that require 32-bits/64-bits conversion 1102 * 1103 * The V4L2 ioctls that aren't listed there don't have pointer arguments 1104 * and the struct size is identical for both 32 and 64 bits versions, so 1105 * they don't need translations. 1106 */ 1107 1108 #define VIDIOC_G_FMT32 _IOWR('V', 4, struct v4l2_format32) 1109 #define VIDIOC_S_FMT32 _IOWR('V', 5, struct v4l2_format32) 1110 #define VIDIOC_QUERYBUF32 _IOWR('V', 9, struct v4l2_buffer32) 1111 #define VIDIOC_G_FBUF32 _IOR ('V', 10, struct v4l2_framebuffer32) 1112 #define VIDIOC_S_FBUF32 _IOW ('V', 11, struct v4l2_framebuffer32) 1113 #define VIDIOC_QBUF32 _IOWR('V', 15, struct v4l2_buffer32) 1114 #define VIDIOC_DQBUF32 _IOWR('V', 17, struct v4l2_buffer32) 1115 #define VIDIOC_ENUMSTD32 _IOWR('V', 25, struct v4l2_standard32) 1116 #define VIDIOC_ENUMINPUT32 _IOWR('V', 26, struct v4l2_input32) 1117 #define VIDIOC_G_EDID32 _IOWR('V', 40, struct v4l2_edid32) 1118 #define VIDIOC_S_EDID32 _IOWR('V', 41, struct v4l2_edid32) 1119 #define VIDIOC_TRY_FMT32 _IOWR('V', 64, struct v4l2_format32) 1120 #define VIDIOC_G_EXT_CTRLS32 _IOWR('V', 71, struct v4l2_ext_controls32) 1121 #define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32) 1122 #define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32) 1123 #define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32) 1124 #define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32) 1125 #define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32) 1126 1127 #define VIDIOC_OVERLAY32 _IOW ('V', 14, s32) 1128 #define VIDIOC_STREAMON32 _IOW ('V', 18, s32) 1129 #define VIDIOC_STREAMOFF32 _IOW ('V', 19, s32) 1130 #define VIDIOC_G_INPUT32 _IOR ('V', 38, s32) 1131 #define VIDIOC_S_INPUT32 _IOWR('V', 39, s32) 1132 #define VIDIOC_G_OUTPUT32 _IOR ('V', 46, s32) 1133 #define VIDIOC_S_OUTPUT32 _IOWR('V', 47, s32) 1134 1135 /** 1136 * alloc_userspace() - Allocates a 64-bits userspace pointer compatible 1137 * for calling the native 64-bits version of an ioctl. 1138 * 1139 * @size: size of the structure itself to be allocated. 1140 * @aux_space: extra size needed to store "extra" data, e.g. space for 1141 * other __user data that is pointed to fields inside the 1142 * structure. 1143 * @new_p64: pointer to a pointer to be filled with the allocated struct. 1144 * 1145 * Return: 1146 * 1147 * if it can't allocate memory, either -ENOMEM or -EFAULT will be returned. 1148 * Zero otherwise. 1149 */ 1150 static int alloc_userspace(unsigned int size, u32 aux_space, 1151 void __user **new_p64) 1152 { 1153 *new_p64 = compat_alloc_user_space(size + aux_space); 1154 if (!*new_p64) 1155 return -ENOMEM; 1156 if (clear_user(*new_p64, size)) 1157 return -EFAULT; 1158 return 0; 1159 } 1160 1161 /** 1162 * do_video_ioctl() - Ancillary function with handles a compat32 ioctl call 1163 * 1164 * @file: pointer to &struct file with the file handler 1165 * @cmd: ioctl to be called 1166 * @arg: arguments passed from/to the ioctl handler 1167 * 1168 * This function is called when a 32 bits application calls a V4L2 ioctl 1169 * and the Kernel is compiled with 64 bits. 1170 * 1171 * This function is called by v4l2_compat_ioctl32() when the function is 1172 * not private to some specific driver. 1173 * 1174 * It converts a 32-bits struct into a 64 bits one, calls the native 64-bits 1175 * ioctl handler and fills back the 32-bits struct with the results of the 1176 * native call. 1177 */ 1178 static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1179 { 1180 void __user *p32 = compat_ptr(arg); 1181 void __user *new_p64 = NULL; 1182 void __user *aux_buf; 1183 u32 aux_space; 1184 int compatible_arg = 1; 1185 long err = 0; 1186 1187 /* 1188 * 1. When struct size is different, converts the command. 1189 */ 1190 switch (cmd) { 1191 case VIDIOC_G_FMT32: cmd = VIDIOC_G_FMT; break; 1192 case VIDIOC_S_FMT32: cmd = VIDIOC_S_FMT; break; 1193 case VIDIOC_QUERYBUF32: cmd = VIDIOC_QUERYBUF; break; 1194 case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break; 1195 case VIDIOC_S_FBUF32: cmd = VIDIOC_S_FBUF; break; 1196 case VIDIOC_QBUF32: cmd = VIDIOC_QBUF; break; 1197 case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break; 1198 case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break; 1199 case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break; 1200 case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break; 1201 case VIDIOC_G_EXT_CTRLS32: cmd = VIDIOC_G_EXT_CTRLS; break; 1202 case VIDIOC_S_EXT_CTRLS32: cmd = VIDIOC_S_EXT_CTRLS; break; 1203 case VIDIOC_TRY_EXT_CTRLS32: cmd = VIDIOC_TRY_EXT_CTRLS; break; 1204 case VIDIOC_DQEVENT32: cmd = VIDIOC_DQEVENT; break; 1205 case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break; 1206 case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break; 1207 case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break; 1208 case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break; 1209 case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break; 1210 case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break; 1211 case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break; 1212 case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break; 1213 case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break; 1214 case VIDIOC_G_EDID32: cmd = VIDIOC_G_EDID; break; 1215 case VIDIOC_S_EDID32: cmd = VIDIOC_S_EDID; break; 1216 } 1217 1218 /* 1219 * 2. Allocates a 64-bits userspace pointer to store the 1220 * values of the ioctl and copy data from the 32-bits __user 1221 * argument into it. 1222 */ 1223 switch (cmd) { 1224 case VIDIOC_OVERLAY: 1225 case VIDIOC_STREAMON: 1226 case VIDIOC_STREAMOFF: 1227 case VIDIOC_S_INPUT: 1228 case VIDIOC_S_OUTPUT: 1229 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64); 1230 if (!err && assign_in_user((unsigned int __user *)new_p64, 1231 (compat_uint_t __user *)p32)) 1232 err = -EFAULT; 1233 compatible_arg = 0; 1234 break; 1235 1236 case VIDIOC_G_INPUT: 1237 case VIDIOC_G_OUTPUT: 1238 err = alloc_userspace(sizeof(unsigned int), 0, &new_p64); 1239 compatible_arg = 0; 1240 break; 1241 1242 case VIDIOC_G_EDID: 1243 case VIDIOC_S_EDID: 1244 err = alloc_userspace(sizeof(struct v4l2_edid), 0, &new_p64); 1245 if (!err) 1246 err = get_v4l2_edid32(new_p64, p32); 1247 compatible_arg = 0; 1248 break; 1249 1250 case VIDIOC_G_FMT: 1251 case VIDIOC_S_FMT: 1252 case VIDIOC_TRY_FMT: 1253 err = bufsize_v4l2_format(p32, &aux_space); 1254 if (!err) 1255 err = alloc_userspace(sizeof(struct v4l2_format), 1256 aux_space, &new_p64); 1257 if (!err) { 1258 aux_buf = new_p64 + sizeof(struct v4l2_format); 1259 err = get_v4l2_format32(new_p64, p32, 1260 aux_buf, aux_space); 1261 } 1262 compatible_arg = 0; 1263 break; 1264 1265 case VIDIOC_CREATE_BUFS: 1266 err = bufsize_v4l2_create(p32, &aux_space); 1267 if (!err) 1268 err = alloc_userspace(sizeof(struct v4l2_create_buffers), 1269 aux_space, &new_p64); 1270 if (!err) { 1271 aux_buf = new_p64 + sizeof(struct v4l2_create_buffers); 1272 err = get_v4l2_create32(new_p64, p32, 1273 aux_buf, aux_space); 1274 } 1275 compatible_arg = 0; 1276 break; 1277 1278 case VIDIOC_PREPARE_BUF: 1279 case VIDIOC_QUERYBUF: 1280 case VIDIOC_QBUF: 1281 case VIDIOC_DQBUF: 1282 err = bufsize_v4l2_buffer(p32, &aux_space); 1283 if (!err) 1284 err = alloc_userspace(sizeof(struct v4l2_buffer), 1285 aux_space, &new_p64); 1286 if (!err) { 1287 aux_buf = new_p64 + sizeof(struct v4l2_buffer); 1288 err = get_v4l2_buffer32(new_p64, p32, 1289 aux_buf, aux_space); 1290 } 1291 compatible_arg = 0; 1292 break; 1293 1294 case VIDIOC_S_FBUF: 1295 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0, 1296 &new_p64); 1297 if (!err) 1298 err = get_v4l2_framebuffer32(new_p64, p32); 1299 compatible_arg = 0; 1300 break; 1301 1302 case VIDIOC_G_FBUF: 1303 err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0, 1304 &new_p64); 1305 compatible_arg = 0; 1306 break; 1307 1308 case VIDIOC_ENUMSTD: 1309 err = alloc_userspace(sizeof(struct v4l2_standard), 0, 1310 &new_p64); 1311 if (!err) 1312 err = get_v4l2_standard32(new_p64, p32); 1313 compatible_arg = 0; 1314 break; 1315 1316 case VIDIOC_ENUMINPUT: 1317 err = alloc_userspace(sizeof(struct v4l2_input), 0, &new_p64); 1318 if (!err) 1319 err = get_v4l2_input32(new_p64, p32); 1320 compatible_arg = 0; 1321 break; 1322 1323 case VIDIOC_G_EXT_CTRLS: 1324 case VIDIOC_S_EXT_CTRLS: 1325 case VIDIOC_TRY_EXT_CTRLS: 1326 err = bufsize_v4l2_ext_controls(p32, &aux_space); 1327 if (!err) 1328 err = alloc_userspace(sizeof(struct v4l2_ext_controls), 1329 aux_space, &new_p64); 1330 if (!err) { 1331 aux_buf = new_p64 + sizeof(struct v4l2_ext_controls); 1332 err = get_v4l2_ext_controls32(file, new_p64, p32, 1333 aux_buf, aux_space); 1334 } 1335 compatible_arg = 0; 1336 break; 1337 case VIDIOC_DQEVENT: 1338 err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64); 1339 compatible_arg = 0; 1340 break; 1341 } 1342 if (err) 1343 return err; 1344 1345 /* 1346 * 3. Calls the native 64-bits ioctl handler. 1347 * 1348 * For the functions where a conversion was not needed, 1349 * compatible_arg is true, and it will call it with the arguments 1350 * provided by userspace and stored at @p32 var. 1351 * 1352 * Otherwise, it will pass the newly allocated @new_p64 argument. 1353 */ 1354 if (compatible_arg) 1355 err = native_ioctl(file, cmd, (unsigned long)p32); 1356 else 1357 err = native_ioctl(file, cmd, (unsigned long)new_p64); 1358 1359 if (err == -ENOTTY) 1360 return err; 1361 1362 /* 1363 * 4. Special case: even after an error we need to put the 1364 * results back for some ioctls. 1365 * 1366 * In the case of EXT_CTRLS, the error_idx will contain information 1367 * on which control failed. 1368 * 1369 * In the case of S_EDID, the driver can return E2BIG and set 1370 * the blocks to maximum allowed value. 1371 */ 1372 switch (cmd) { 1373 case VIDIOC_G_EXT_CTRLS: 1374 case VIDIOC_S_EXT_CTRLS: 1375 case VIDIOC_TRY_EXT_CTRLS: 1376 if (put_v4l2_ext_controls32(file, new_p64, p32)) 1377 err = -EFAULT; 1378 break; 1379 case VIDIOC_S_EDID: 1380 if (put_v4l2_edid32(new_p64, p32)) 1381 err = -EFAULT; 1382 break; 1383 } 1384 if (err) 1385 return err; 1386 1387 /* 1388 * 5. Copy the data returned at the 64 bits userspace pointer to 1389 * the original 32 bits structure. 1390 */ 1391 switch (cmd) { 1392 case VIDIOC_S_INPUT: 1393 case VIDIOC_S_OUTPUT: 1394 case VIDIOC_G_INPUT: 1395 case VIDIOC_G_OUTPUT: 1396 if (assign_in_user((compat_uint_t __user *)p32, 1397 ((unsigned int __user *)new_p64))) 1398 err = -EFAULT; 1399 break; 1400 1401 case VIDIOC_G_FBUF: 1402 err = put_v4l2_framebuffer32(new_p64, p32); 1403 break; 1404 1405 case VIDIOC_DQEVENT: 1406 err = put_v4l2_event32(new_p64, p32); 1407 break; 1408 1409 case VIDIOC_G_EDID: 1410 err = put_v4l2_edid32(new_p64, p32); 1411 break; 1412 1413 case VIDIOC_G_FMT: 1414 case VIDIOC_S_FMT: 1415 case VIDIOC_TRY_FMT: 1416 err = put_v4l2_format32(new_p64, p32); 1417 break; 1418 1419 case VIDIOC_CREATE_BUFS: 1420 err = put_v4l2_create32(new_p64, p32); 1421 break; 1422 1423 case VIDIOC_PREPARE_BUF: 1424 case VIDIOC_QUERYBUF: 1425 case VIDIOC_QBUF: 1426 case VIDIOC_DQBUF: 1427 err = put_v4l2_buffer32(new_p64, p32); 1428 break; 1429 1430 case VIDIOC_ENUMSTD: 1431 err = put_v4l2_standard32(new_p64, p32); 1432 break; 1433 1434 case VIDIOC_ENUMINPUT: 1435 err = put_v4l2_input32(new_p64, p32); 1436 break; 1437 } 1438 return err; 1439 } 1440 1441 /** 1442 * v4l2_compat_ioctl32() - Handles a compat32 ioctl call 1443 * 1444 * @file: pointer to &struct file with the file handler 1445 * @cmd: ioctl to be called 1446 * @arg: arguments passed from/to the ioctl handler 1447 * 1448 * This function is meant to be used as .compat_ioctl fops at v4l2-dev.c 1449 * in order to deal with 32-bit calls on a 64-bits Kernel. 1450 * 1451 * This function calls do_video_ioctl() for non-private V4L2 ioctls. 1452 * If the function is a private one it calls vdev->fops->compat_ioctl32 1453 * instead. 1454 */ 1455 long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg) 1456 { 1457 struct video_device *vdev = video_devdata(file); 1458 long ret = -ENOIOCTLCMD; 1459 1460 if (!file->f_op->unlocked_ioctl) 1461 return ret; 1462 1463 if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE) 1464 ret = do_video_ioctl(file, cmd, arg); 1465 else if (vdev->fops->compat_ioctl32) 1466 ret = vdev->fops->compat_ioctl32(file, cmd, arg); 1467 1468 if (ret == -ENOIOCTLCMD) 1469 pr_debug("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)\n", 1470 _IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd); 1471 return ret; 1472 } 1473 EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32); 1474