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