1 /* 2 * (C) Copyright 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * (C) 2017 Theobroma Systems Design und Consulting GmbH 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 * 9 * Helper functions for Rockchip images 10 */ 11 12 #include "imagetool.h" 13 #include <image.h> 14 #include <u-boot/sha256.h> 15 #include <rc4.h> 16 #include "mkimage.h" 17 #include "rkcommon.h" 18 19 enum { 20 RK_MAGIC = 0x0ff0aa55, 21 RK_MAGIC_V2 = 0x534E4B52, 22 }; 23 24 enum { 25 RK_HEADER_V1 = 1, 26 RK_HEADER_V2 = 2, 27 }; 28 29 enum hash_type { 30 HASH_NONE = 0, 31 HASH_SHA256 = 1, 32 HASH_SHA512 = 2, 33 }; 34 35 /** 36 * struct image_entry 37 * 38 * @size_and_off: [31:16]image size;[15:0]image offset 39 * @address: default as 0xFFFFFFFF 40 * @flag: no use 41 * @counter: no use 42 * @hash: hash of image 43 * 44 */ 45 struct image_entry { 46 uint32_t size_and_off; 47 uint32_t address; 48 uint32_t flag; 49 uint32_t counter; 50 uint8_t reserved[8]; 51 uint8_t hash[64]; 52 }; 53 54 /** 55 * struct header0_info_v2 - from rk35 on boot rom using the new header block 56 * 57 * This is stored at SD card block 64 (where each block is 512 bytes) 58 * 59 * @magic: Magic (must be RK_MAGIC_V2) 60 * @size_and_nimage: [31:16]number of images;[15:0] 61 * offset to hash field of header(unit as 4Byte) 62 * @boot_flag: [3:0]hash type(0:none,1:sha256,2:sha512) 63 * @signature: hash or signature for header info 64 * 65 */ 66 struct header0_info_v2 { 67 uint32_t magic; 68 uint8_t reserved[4]; 69 uint32_t size_and_nimage; 70 uint32_t boot_flag; 71 uint8_t reserved1[104]; 72 struct image_entry images[4]; 73 uint8_t reserved2[1064]; 74 uint8_t hash[512]; 75 }; 76 77 /** 78 * struct header0_info - header block for boot ROM 79 * 80 * This is stored at SD card block 64 (where each block is 512 bytes, or at 81 * the start of SPI flash. It is encoded with RC4. 82 * 83 * @magic: Magic (must be RK_MAGIC) 84 * @disable_rc4: 0 to use rc4 for boot image, 1 to use plain binary 85 * @init_offset: Offset in blocks of the SPL code from this header 86 * block. E.g. 4 means 2KB after the start of this header. 87 * Other fields are not used by U-Boot 88 */ 89 struct header0_info { 90 uint32_t magic; 91 uint8_t reserved[4]; 92 uint32_t disable_rc4; 93 uint16_t init_offset; 94 uint8_t reserved1[492]; 95 uint16_t init_size; 96 uint16_t init_boot_size; 97 uint8_t reserved2[2]; 98 }; 99 100 /** 101 * struct header1 info 102 */ 103 struct header1_info { 104 uint32_t magic; 105 }; 106 107 /** 108 * struct spl_info - spl info for each chip 109 * 110 * @imagename: Image name(passed by "mkimage -n") 111 * @spl_hdr: Boot ROM requires a 4-bytes spl header 112 * @spl_size: Spl size(include extra 4-bytes spl header) 113 * @spl_rc4: RC4 encode the SPL binary (same key as header) 114 * @header_ver: header block version 115 */ 116 struct spl_info { 117 const char *imagename; 118 const char *spl_hdr; 119 const uint32_t spl_size; 120 const bool spl_rc4; 121 const uint32_t header_ver; 122 }; 123 124 static struct spl_info spl_infos[] = { 125 { "rk3036", "RK30", 0x1000, false, RK_HEADER_V1 }, 126 { "rk3066", "RK30", 0x8000, true, RK_HEADER_V1 }, 127 { "rk3128", "RK31", 0x2000 - 0x800, false, RK_HEADER_V1 }, 128 { "px3se", "RK31", 0x2000 - 0x800, false, RK_HEADER_V1 }, 129 { "rk3188", "RK31", 0x8000 - 0x800, true, RK_HEADER_V1 }, 130 { "rk322x", "RK32", 0x8000 - 0x1000, false, RK_HEADER_V1 }, 131 { "rk3288", "RK32", 0x8000, false, RK_HEADER_V1 }, 132 { "rk3308", "RK33", 0x40000 - 0x1000, false, RK_HEADER_V1 }, 133 { "rk3328", "RK32", 0x8000 - 0x800, false, RK_HEADER_V1 }, 134 { "rk3368", "RK33", 0x8000 - 0x1000, false, RK_HEADER_V1 }, 135 { "rk3399", "RK33", 0x30000 - 0x2000, false, RK_HEADER_V1 }, 136 { "rk3326", "RK33", 0x4000 - 0x1000, false, RK_HEADER_V1 }, 137 { "px30", "RK33", 0x4000 - 0x1000, false, RK_HEADER_V1 }, 138 { "rv1108", "RK11", 0x1800, false, RK_HEADER_V1 }, 139 { "rv1126", "110B", 0x10000 - 0x1000, false, RK_HEADER_V1 }, 140 { "rk1808", "RK18", 0x200000 - 0x2000, false, RK_HEADER_V1 }, 141 { "rk3528", "RK35", 0x10000 - 0x1000, false, RK_HEADER_V2 }, 142 { "rk3562", "RK35", 0x10000 - 0x1000, false, RK_HEADER_V2 }, 143 { "rk3568", "RK35", 0x10000 - 0x1000, false, RK_HEADER_V2 }, 144 { "rk3588", "RK35", 0x100000 - 0x1000, false, RK_HEADER_V2 }, 145 }; 146 147 /** 148 * struct spl_params - spl params parsed in check_params() 149 * 150 * @init_file: Init data file path 151 * @init_size: Aligned size of init data in bytes 152 * @boot_file: Boot data file path 153 * @boot_size: Aligned size of boot data in bytes 154 */ 155 156 struct spl_params { 157 char *init_file; 158 uint32_t init_size; 159 char *boot_file; 160 uint32_t boot_size; 161 }; 162 163 static struct spl_params spl_params = { 0 }; 164 165 static unsigned char rc4_key[16] = { 166 124, 78, 3, 4, 85, 5, 9, 7, 167 45, 44, 123, 56, 23, 13, 23, 17 168 }; 169 170 static struct spl_info *rkcommon_get_spl_info(char *imagename) 171 { 172 int i; 173 174 if (!imagename) 175 return NULL; 176 177 for (i = 0; i < ARRAY_SIZE(spl_infos); i++) 178 if (!strncmp(imagename, spl_infos[i].imagename, 6)) 179 return spl_infos + i; 180 181 return NULL; 182 } 183 184 static int rkcommon_get_aligned_size(struct image_tool_params *params, 185 const char *fname) 186 { 187 int size; 188 189 size = imagetool_get_filesize(params, fname); 190 if (size < 0) 191 return -1; 192 193 /* 194 * Pad to a 2KB alignment, as required for init/boot size by the ROM 195 * (see https://lists.denx.de/pipermail/u-boot/2017-May/293268.html) 196 */ 197 return ROUND(size, RK_SIZE_ALIGN); 198 } 199 200 int rkcommon_check_params(struct image_tool_params *params) 201 { 202 int i; 203 204 /* 205 * If this is a operation (list or extract), the don't require 206 * imagename to be set. 207 */ 208 if (params->lflag || params->iflag) 209 return EXIT_SUCCESS; 210 211 if (!rkcommon_get_spl_info(params->imagename)) 212 goto err_spl_info; 213 214 spl_params.init_file = params->datafile; 215 216 spl_params.boot_file = strchr(spl_params.init_file, ':'); 217 if (spl_params.boot_file) { 218 *spl_params.boot_file = '\0'; 219 spl_params.boot_file += 1; 220 } 221 222 spl_params.init_size = 223 rkcommon_get_aligned_size(params, spl_params.init_file); 224 if (spl_params.init_size < 0) 225 return EXIT_FAILURE; 226 227 /* Boot file is optional, and only for back-to-bootrom functionality. */ 228 if (spl_params.boot_file) { 229 spl_params.boot_size = 230 rkcommon_get_aligned_size(params, spl_params.boot_file); 231 if (spl_params.boot_size < 0) 232 return EXIT_FAILURE; 233 } 234 235 if (spl_params.init_size > rkcommon_get_spl_size(params)) { 236 fprintf(stderr, 237 "Error: SPL image is too large (size %#x than %#x)\n", 238 spl_params.init_size, rkcommon_get_spl_size(params)); 239 return EXIT_FAILURE; 240 } 241 242 return EXIT_SUCCESS; 243 244 err_spl_info: 245 fprintf(stderr, "ERROR: imagename (%s) is not supported!\n", 246 params->imagename ? params->imagename : "NULL"); 247 248 fprintf(stderr, "Available imagename:"); 249 for (i = 0; i < ARRAY_SIZE(spl_infos); i++) 250 fprintf(stderr, "\t%s", spl_infos[i].imagename); 251 fprintf(stderr, "\n"); 252 253 return EXIT_FAILURE; 254 } 255 256 const char *rkcommon_get_spl_hdr(struct image_tool_params *params) 257 { 258 struct spl_info *info = rkcommon_get_spl_info(params->imagename); 259 260 /* 261 * info would not be NULL, because of we checked params before. 262 */ 263 return info->spl_hdr; 264 } 265 266 int rkcommon_get_spl_size(struct image_tool_params *params) 267 { 268 struct spl_info *info = rkcommon_get_spl_info(params->imagename); 269 270 /* 271 * info would not be NULL, because of we checked params before. 272 */ 273 return info->spl_size; 274 } 275 276 bool rkcommon_need_rc4_spl(struct image_tool_params *params) 277 { 278 struct spl_info *info = rkcommon_get_spl_info(params->imagename); 279 280 /* 281 * info would not be NULL, because of we checked params before. 282 */ 283 return info->spl_rc4; 284 } 285 286 bool rkcommon_is_header_v2(struct image_tool_params *params) 287 { 288 struct spl_info *info = rkcommon_get_spl_info(params->imagename); 289 290 /* 291 * info would not be NULL, because of we checked params before. 292 */ 293 return (info->header_ver == RK_HEADER_V2); 294 } 295 296 static void do_sha256_hash(uint8_t *buf, uint32_t size, uint8_t *out) 297 { 298 sha256_context ctx; 299 300 sha256_starts(&ctx); 301 sha256_update(&ctx, buf, size); 302 sha256_finish(&ctx, out); 303 } 304 305 static void rkcommon_set_header0(void *buf, struct image_tool_params *params) 306 { 307 struct header0_info *hdr = buf; 308 309 memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE); 310 hdr->magic = RK_MAGIC; 311 hdr->disable_rc4 = !rkcommon_need_rc4_spl(params); 312 hdr->init_offset = RK_INIT_OFFSET; 313 hdr->init_size = spl_params.init_size / RK_BLK_SIZE; 314 315 /* 316 * init_boot_size needs to be set, as it is read by the BootROM 317 * to determine the size of the next-stage bootloader (e.g. U-Boot 318 * proper), when used with the back-to-bootrom functionality. 319 * 320 * see https://lists.denx.de/pipermail/u-boot/2017-May/293267.html 321 * for a more detailed explanation by Andy Yan 322 */ 323 if (spl_params.boot_file) 324 hdr->init_boot_size = 325 hdr->init_size + spl_params.boot_size / RK_BLK_SIZE; 326 else 327 hdr->init_boot_size = 328 hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE; 329 330 rc4_encode(buf, RK_BLK_SIZE, rc4_key); 331 } 332 333 static void rkcommon_set_header0_v2(void *buf, struct image_tool_params *params) 334 { 335 struct header0_info_v2 *hdr = buf; 336 uint32_t sector_offset, image_sector_count; 337 uint32_t image_size_array[2]; 338 uint8_t *image_ptr = NULL; 339 int i; 340 341 printf("Image Type: Rockchip %s boot image\n", rkcommon_get_spl_hdr(params)); 342 memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE); 343 hdr->magic = cpu_to_le32(RK_MAGIC_V2); 344 hdr->size_and_nimage = cpu_to_le32((2 << 16) + 384); 345 hdr->boot_flag = cpu_to_le32(HASH_SHA256); 346 sector_offset = 4; 347 image_size_array[0] = spl_params.init_size; 348 image_size_array[1] = spl_params.boot_size; 349 350 for (i = 0; i < 2; i++) { 351 image_sector_count = image_size_array[i] / RK_BLK_SIZE; 352 hdr->images[i].size_and_off = cpu_to_le32((image_sector_count << 16) + sector_offset); 353 hdr->images[i].address = 0xFFFFFFFF; 354 hdr->images[i].counter = cpu_to_le32(i + 1); 355 image_ptr = buf + sector_offset * RK_BLK_SIZE; 356 do_sha256_hash(image_ptr, image_size_array[i], hdr->images[i].hash); 357 sector_offset = sector_offset + image_sector_count; 358 } 359 360 do_sha256_hash(buf, (void *)hdr->hash - buf, hdr->hash); 361 } 362 363 void rkcommon_set_header(void *buf, struct stat *sbuf, int ifd, 364 struct image_tool_params *params) 365 { 366 struct header1_info *hdr = buf + RK_SPL_HDR_START; 367 368 if (rkcommon_is_header_v2(params)) { 369 rkcommon_set_header0_v2(buf, params); 370 } else { 371 rkcommon_set_header0(buf, params); 372 373 /* Set up the SPL name (i.e. copy spl_hdr over) */ 374 if (memcmp(&hdr->magic, "RSAK", 4)) 375 memcpy(&hdr->magic, rkcommon_get_spl_hdr(params), RK_SPL_HDR_SIZE); 376 377 if (rkcommon_need_rc4_spl(params)) 378 rkcommon_rc4_encode_spl(buf, RK_SPL_HDR_START, 379 spl_params.init_size); 380 381 if (spl_params.boot_file) { 382 if (rkcommon_need_rc4_spl(params)) 383 rkcommon_rc4_encode_spl(buf + RK_SPL_HDR_START, 384 spl_params.init_size, 385 spl_params.boot_size); 386 } 387 } 388 } 389 390 static inline unsigned int rkcommon_offset_to_spi(unsigned int offset) 391 { 392 /* 393 * While SD/MMC images use a flat addressing, SPI images are padded 394 * to use the first 2K of every 4K sector only. 395 */ 396 return ((offset & ~0x7ff) << 1) + (offset & 0x7ff); 397 } 398 399 static int rkcommon_parse_header(const void *buf, struct header0_info *header0, 400 struct spl_info **spl_info) 401 { 402 unsigned int hdr1_offset; 403 struct header1_info *hdr1_sdmmc, *hdr1_spi; 404 int i; 405 406 if (spl_info) 407 *spl_info = NULL; 408 409 /* 410 * The first header (hdr0) is always RC4 encoded, so try to decrypt 411 * with the well-known key. 412 */ 413 memcpy((void *)header0, buf, sizeof(struct header0_info)); 414 rc4_encode((void *)header0, sizeof(struct header0_info), rc4_key); 415 416 if (header0->magic != RK_MAGIC) 417 return -EPROTO; 418 419 /* We don't support RC4 encoded image payloads here, yet... */ 420 if (header0->disable_rc4 == 0) 421 return -ENOSYS; 422 423 hdr1_offset = header0->init_offset * RK_BLK_SIZE; 424 hdr1_sdmmc = (struct header1_info *)(buf + hdr1_offset); 425 hdr1_spi = (struct header1_info *)(buf + 426 rkcommon_offset_to_spi(hdr1_offset)); 427 428 for (i = 0; i < ARRAY_SIZE(spl_infos); i++) { 429 if (!memcmp(&hdr1_sdmmc->magic, spl_infos[i].spl_hdr, 4)) { 430 if (spl_info) 431 *spl_info = &spl_infos[i]; 432 return IH_TYPE_RKSD; 433 } else if (!memcmp(&hdr1_spi->magic, spl_infos[i].spl_hdr, 4)) { 434 if (spl_info) 435 *spl_info = &spl_infos[i]; 436 return IH_TYPE_RKSPI; 437 } 438 } 439 440 return -1; 441 } 442 443 static int rkcommon_parse_header_v2(const void *buf, struct header0_info_v2 *header) 444 { 445 memcpy((void *)header, buf, sizeof(struct header0_info_v2)); 446 447 if (le32_to_cpu(header->magic) != RK_MAGIC_V2) 448 return -EPROTO; 449 450 return 0; 451 } 452 453 int rkcommon_verify_header(unsigned char *buf, int size, 454 struct image_tool_params *params) 455 { 456 struct header0_info header0; 457 struct spl_info *img_spl_info, *spl_info; 458 int ret; 459 460 /* spl_hdr is abandon on header_v2 */ 461 if ((*(uint32_t *)buf) == RK_MAGIC_V2) 462 return 0; 463 464 ret = rkcommon_parse_header(buf, &header0, &img_spl_info); 465 466 /* If this is the (unimplemented) RC4 case, then rewrite the result */ 467 if (ret == -ENOSYS) 468 return 0; 469 470 if (ret < 0) 471 return ret; 472 473 /* 474 * If no 'imagename' is specified via the commandline (e.g. if this is 475 * 'dumpimage -l' w/o any further constraints), we accept any spl_info. 476 */ 477 if (params->imagename == NULL) 478 return 0; 479 480 /* Match the 'imagename' against the 'spl_hdr' found */ 481 spl_info = rkcommon_get_spl_info(params->imagename); 482 if (spl_info && img_spl_info) 483 return strcmp(spl_info->spl_hdr, img_spl_info->spl_hdr); 484 485 return -ENOENT; 486 } 487 488 void rkcommon_print_header(const void *buf) 489 { 490 struct header0_info header0; 491 struct header0_info_v2 header0_v2; 492 struct spl_info *spl_info; 493 uint8_t image_type; 494 int ret, boot_size, init_size; 495 496 if ((*(uint32_t *)buf) == RK_MAGIC_V2) { 497 ret = rkcommon_parse_header_v2(buf, &header0_v2); 498 499 if (ret < 0) { 500 fprintf(stderr, "Error: image verification failed\n"); 501 return; 502 } 503 504 init_size = header0_v2.images[0].size_and_off >> 16; 505 init_size = init_size * RK_BLK_SIZE; 506 boot_size = header0_v2.images[1].size_and_off >> 16; 507 boot_size = boot_size * RK_BLK_SIZE; 508 } else { 509 ret = rkcommon_parse_header(buf, &header0, &spl_info); 510 511 /* If this is the (unimplemented) RC4 case, then fail silently */ 512 if (ret == -ENOSYS) 513 return; 514 515 if (ret < 0) { 516 fprintf(stderr, "Error: image verification failed\n"); 517 return; 518 } 519 520 image_type = ret; 521 init_size = header0.init_size * RK_BLK_SIZE; 522 boot_size = header0.init_boot_size * RK_BLK_SIZE - init_size; 523 printf("Image Type: Rockchip %s (%s) boot image\n", 524 spl_info->spl_hdr, 525 (image_type == IH_TYPE_RKSD) ? "SD/MMC" : "SPI"); 526 } 527 528 printf("Init Data Size: %d bytes\n", init_size); 529 530 if (boot_size != RK_MAX_BOOT_SIZE) 531 printf("Boot Data Size: %d bytes\n", boot_size); 532 } 533 534 void rkcommon_rc4_encode_spl(void *buf, unsigned int offset, unsigned int size) 535 { 536 unsigned int remaining = size; 537 538 while (remaining > 0) { 539 int step = (remaining > RK_BLK_SIZE) ? RK_BLK_SIZE : remaining; 540 541 rc4_encode(buf + offset, step, rc4_key); 542 offset += RK_BLK_SIZE; 543 remaining -= step; 544 } 545 } 546 547 int rkcommon_vrec_header(struct image_tool_params *params, 548 struct image_type_params *tparams) 549 { 550 /* 551 * The SPL image looks as follows: 552 * 553 * 0x0 header0 (see rkcommon.c) 554 * 0x800 spl_name ('RK30', ..., 'RK33') 555 * (start of the payload for AArch64 payloads: we expect the 556 * first 4 bytes to be available for overwriting with our 557 * spl_name) 558 * 0x804 first instruction to be executed 559 * (start of the image/payload for 32bit payloads) 560 * 561 * For AArch64 (ARMv8) payloads, natural alignment (8-bytes) is 562 * required for its sections (so the image we receive needs to 563 * have the first 4 bytes reserved for the spl_name). Reserving 564 * these 4 bytes is done using the BOOT0_HOOK infrastructure. 565 * 566 * The header is always at 0x800 (as we now use a payload 567 * prepadded using the boot0 hook for all targets): the first 568 * 4 bytes of these images can safely be overwritten using the 569 * boot magic. 570 */ 571 tparams->header_size = RK_SPL_HDR_START; 572 573 /* Allocate, clear and install the header */ 574 tparams->hdr = malloc(tparams->header_size); 575 if (!tparams->hdr) { 576 fprintf(stderr, "%s: Can't alloc header: %s\n", 577 params->cmdname, strerror(errno)); 578 exit(EXIT_FAILURE); 579 } 580 memset(tparams->hdr, 0, tparams->header_size); 581 582 /* 583 * We need to store the original file-size (i.e. before padding), as 584 * imagetool does not set this during its adjustment of file_size. 585 */ 586 params->orig_file_size = tparams->header_size + 587 spl_params.init_size + spl_params.boot_size; 588 589 params->file_size = ROUND(params->orig_file_size, RK_SIZE_ALIGN); 590 591 /* Ignoring pad len, since we are using our own copy_image() */ 592 return 0; 593 } 594 595 static int pad_file(struct image_tool_params *params, int ifd, int pad) 596 { 597 uint8_t zeros[4096]; 598 599 memset(zeros, 0, sizeof(zeros)); 600 601 while (pad > 0) { 602 int todo = sizeof(zeros); 603 604 if (todo > pad) 605 todo = pad; 606 if (write(ifd, (char *)&zeros, todo) != todo) { 607 fprintf(stderr, "%s: Write error on %s: %s\n", 608 params->cmdname, params->imagefile, 609 strerror(errno)); 610 return -1; 611 } 612 pad -= todo; 613 } 614 615 return 0; 616 } 617 618 static int copy_file(struct image_tool_params *params, int ifd, 619 const char *file, int padded_size) 620 { 621 int dfd; 622 struct stat sbuf; 623 unsigned char *ptr; 624 int size; 625 626 if (params->vflag) 627 fprintf(stderr, "Adding Image %s\n", file); 628 629 dfd = open(file, O_RDONLY | O_BINARY); 630 if (dfd < 0) { 631 fprintf(stderr, "%s: Can't open %s: %s\n", 632 params->cmdname, file, strerror(errno)); 633 return -1; 634 } 635 636 if (fstat(dfd, &sbuf) < 0) { 637 fprintf(stderr, "%s: Can't stat %s: %s\n", 638 params->cmdname, file, strerror(errno)); 639 goto err_close; 640 } 641 642 if (params->vflag) 643 fprintf(stderr, "Size %u(pad to %u)\n", 644 (int)sbuf.st_size, padded_size); 645 646 ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, dfd, 0); 647 if (ptr == MAP_FAILED) { 648 fprintf(stderr, "%s: Can't read %s: %s\n", 649 params->cmdname, file, strerror(errno)); 650 goto err_munmap; 651 } 652 653 size = sbuf.st_size; 654 if (write(ifd, ptr, size) != size) { 655 fprintf(stderr, "%s: Write error on %s: %s\n", 656 params->cmdname, params->imagefile, strerror(errno)); 657 goto err_munmap; 658 } 659 660 munmap((void *)ptr, sbuf.st_size); 661 close(dfd); 662 return pad_file(params, ifd, padded_size - size); 663 664 err_munmap: 665 munmap((void *)ptr, sbuf.st_size); 666 err_close: 667 close(dfd); 668 return -1; 669 } 670 671 int rockchip_copy_image(int ifd, struct image_tool_params *params) 672 { 673 int ret; 674 675 ret = copy_file(params, ifd, spl_params.init_file, 676 spl_params.init_size); 677 if (ret) 678 return ret; 679 680 if (spl_params.boot_file) { 681 ret = copy_file(params, ifd, spl_params.boot_file, 682 spl_params.boot_size); 683 if (ret) 684 return ret; 685 } 686 687 return pad_file(params, ifd, 688 params->file_size - params->orig_file_size); 689 } 690