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1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 | /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*- * * Copyright (c) 2009-2012 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #include <stdio.h> #include <unistd.h> #include <sys/stat.h> #include <string.h> #include <dlfcn.h> #include <fcntl.h> #include <stdlib.h> #include <errno.h> #include <sys/mman.h> #include <sys/syslimits.h> #include <mach-o/arch.h> #include <mach-o/loader.h> #include <mach-o/dyld_priv.h> #include <bootstrap.h> #include <mach/mach.h> #include <dispatch/dispatch.h> #include <TargetConditionals.h> #include <map> #include <vector> #include <iostream> #include <optional> #include "ClosureBuilder.h" #include "DyldSharedCache.h" #include "ClosureFileSystemPhysical.h" #include "JSONWriter.h" #include "Trie.hpp" #include "objc-shared-cache.h" #if TARGET_OS_OSX #define DSC_BUNDLE_REL_PATH "../../lib/dsc_extractor.bundle" #else #define DSC_BUNDLE_REL_PATH "../lib/dsc_extractor.bundle" #endif using dyld3::closure::ClosureBuilder; using dyld3::closure::FileSystemPhysical; // mmap() an shared cache file read/only but laid out like it would be at runtime static const DyldSharedCache* mapCacheFile(const char* path) { struct stat statbuf; if ( ::stat(path, &statbuf) ) { fprintf(stderr, "Error: stat failed for dyld shared cache at %s\n", path); return nullptr; } int cache_fd = ::open(path, O_RDONLY); if (cache_fd < 0) { fprintf(stderr, "Error: failed to open shared cache file at %s\n", path); return nullptr; } uint8_t firstPage[4096]; if ( ::pread(cache_fd, firstPage, 4096, 0) != 4096 ) { fprintf(stderr, "Error: failed to read shared cache file at %s\n", path); return nullptr; } const dyld_cache_header* header = (dyld_cache_header*)firstPage; const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(firstPage + header->mappingOffset); size_t vmSize = (size_t)(mappings[2].address + mappings[2].size - mappings[0].address); vm_address_t result; kern_return_t r = ::vm_allocate(mach_task_self(), &result, vmSize, VM_FLAGS_ANYWHERE); if ( r != KERN_SUCCESS ) { fprintf(stderr, "Error: failed to allocate space to load shared cache file at %s\n", path); return nullptr; } for (int i=0; i < 3; ++i) { void* mapped_cache = ::mmap((void*)(result + mappings[i].address - mappings[0].address), (size_t)mappings[i].size, PROT_READ, MAP_FIXED | MAP_PRIVATE, cache_fd, mappings[i].fileOffset); if (mapped_cache == MAP_FAILED) { fprintf(stderr, "Error: mmap() for shared cache at %s failed, errno=%d\n", path, errno); return nullptr; } } ::close(cache_fd); return (DyldSharedCache*)result; } enum Mode { modeNone, modeList, modeMap, modeDependencies, modeSlideInfo, modeVerboseSlideInfo, modeAcceleratorInfo, modeTextInfo, modeLinkEdit, modeLocalSymbols, modeJSONMap, modeJSONDependents, modeSectionSizes, modeStrings, modeInfo, modeSize, modeObjCProtocols, modeObjCClasses, modeObjCSelectors, modeExtract }; struct Options { Mode mode; const char* dependentsOfPath; const char* extractionDir; bool printUUIDs; bool printVMAddrs; bool printDylibVersions; bool printInodes; }; void usage() { fprintf(stderr, "Usage: dyld_shared_cache_util -list [ -uuid ] [-vmaddr] | -dependents <dylib-path> [ -versions ] | -linkedit | -map | -slide_info | -verbose_slide_info | -info | -extract <dylib-dir> [ shared-cache-file ] \n"); } static void checkMode(Mode mode) { if ( mode != modeNone ) { fprintf(stderr, "Error: select one of: -list, -dependents, -info, -slide_info, -verbose_slide_info, -linkedit, -map, -extract, or -size\n"); usage(); exit(1); } } static bool isAlias(const char* path, const DyldSharedCache* dyldCache) { const dyld_cache_header* header = &dyldCache->header; const dyld_cache_mapping_info* mappings = (const dyld_cache_mapping_info*)((char*)dyldCache + header->mappingOffset); const dyld_cache_mapping_info* textMapping = &mappings[0]; // paths for aliases are store between cache header and first segment return path < (char*)textMapping; } int main (int argc, const char* argv[]) { const char* sharedCachePath = nullptr; Options options; options.mode = modeNone; options.printUUIDs = false; options.printVMAddrs = false; options.printDylibVersions = false; options.printInodes = false; options.dependentsOfPath = NULL; options.extractionDir = NULL; bool printStrings = false; bool printExports = false; for (uint32_t i = 1; i < argc; i++) { const char* opt = argv[i]; if (opt[0] == '-') { if (strcmp(opt, "-list") == 0) { checkMode(options.mode); options.mode = modeList; } else if (strcmp(opt, "-dependents") == 0) { checkMode(options.mode); options.mode = modeDependencies; options.dependentsOfPath = argv[++i]; if ( i >= argc ) { fprintf(stderr, "Error: option -depdendents requires an argument\n"); usage(); exit(1); } } else if (strcmp(opt, "-linkedit") == 0) { checkMode(options.mode); options.mode = modeLinkEdit; } else if (strcmp(opt, "-info") == 0) { checkMode(options.mode); options.mode = modeInfo; } else if (strcmp(opt, "-slide_info") == 0) { checkMode(options.mode); options.mode = modeSlideInfo; } else if (strcmp(opt, "-verbose_slide_info") == 0) { checkMode(options.mode); options.mode = modeVerboseSlideInfo; } else if (strcmp(opt, "-accelerator_info") == 0) { checkMode(options.mode); options.mode = modeAcceleratorInfo; } else if (strcmp(opt, "-text_info") == 0) { checkMode(options.mode); options.mode = modeTextInfo; } else if (strcmp(opt, "-local_symbols") == 0) { checkMode(options.mode); options.mode = modeLocalSymbols; } else if (strcmp(opt, "-strings") == 0) { if (options.mode != modeStrings) checkMode(options.mode); options.mode = modeStrings; printStrings = true; } else if (strcmp(opt, "-sections") == 0) { checkMode(options.mode); options.mode = modeSectionSizes; } else if (strcmp(opt, "-exports") == 0) { if (options.mode != modeStrings) checkMode(options.mode); options.mode = modeStrings; printExports = true; } else if (strcmp(opt, "-map") == 0) { checkMode(options.mode); options.mode = modeMap; } else if (strcmp(opt, "-json-map") == 0) { checkMode(options.mode); options.mode = modeJSONMap; } else if (strcmp(opt, "-json-dependents") == 0) { checkMode(options.mode); options.mode = modeJSONDependents; } else if (strcmp(opt, "-size") == 0) { checkMode(options.mode); options.mode = modeSize; } else if (strcmp(opt, "-objc-protocols") == 0) { checkMode(options.mode); options.mode = modeObjCProtocols; } else if (strcmp(opt, "-objc-classes") == 0) { checkMode(options.mode); options.mode = modeObjCClasses; } else if (strcmp(opt, "-objc-selectors") == 0) { checkMode(options.mode); options.mode = modeObjCSelectors; } else if (strcmp(opt, "-extract") == 0) { checkMode(options.mode); options.mode = modeExtract; options.extractionDir = argv[++i]; if ( i >= argc ) { fprintf(stderr, "Error: option -extract requires a directory argument\n"); usage(); exit(1); } } else if (strcmp(opt, "-uuid") == 0) { options.printUUIDs = true; } else if (strcmp(opt, "-inode") == 0) { options.printInodes = true; } else if (strcmp(opt, "-versions") == 0) { options.printDylibVersions = true; } else if (strcmp(opt, "-vmaddr") == 0) { options.printVMAddrs = true; } else { fprintf(stderr, "Error: unrecognized option %s\n", opt); usage(); exit(1); } } else { sharedCachePath = opt; } } if ( options.mode == modeNone ) { fprintf(stderr, "Error: select one of -list, -dependents, -info, -linkedit, or -map\n"); usage(); exit(1); } if ( options.mode != modeSlideInfo && options.mode != modeVerboseSlideInfo ) { if ( options.printUUIDs && (options.mode != modeList) ) fprintf(stderr, "Warning: -uuid option ignored outside of -list mode\n"); if ( options.printVMAddrs && (options.mode != modeList) ) fprintf(stderr, "Warning: -vmaddr option ignored outside of -list mode\n"); if ( options.printDylibVersions && (options.mode != modeDependencies) ) fprintf(stderr, "Warning: -versions option ignored outside of -dependents mode\n"); if ( (options.mode == modeDependencies) && (options.dependentsOfPath == NULL) ) { fprintf(stderr, "Error: -dependents given, but no dylib path specified\n"); usage(); exit(1); } } const DyldSharedCache* dyldCache = nullptr; if ( sharedCachePath != nullptr ) { dyldCache = mapCacheFile(sharedCachePath); // mapCacheFile prints an error if something goes wrong, so just return in that case. if ( dyldCache == nullptr ) return 1; } else { #if !defined(__MAC_OS_X_VERSION_MIN_REQUIRED) || (__MAC_OS_X_VERSION_MIN_REQUIRED >= 101300) size_t cacheLength; dyldCache = (DyldSharedCache*)_dyld_get_shared_cache_range(&cacheLength); #endif if (dyldCache == nullptr) { fprintf(stderr, "Could not get in-memory shared cache\n"); return 1; } if ( options.mode == modeObjCClasses ) { fprintf(stderr, "Cannot use -objc-info with a live cache. Please run with a path to an on-disk cache file\n"); return 1; } } if ( options.mode == modeSlideInfo || options.mode == modeVerboseSlideInfo ) { const dyld_cache_header* header = &dyldCache->header; if ( header->slideInfoOffset == 0 ) { fprintf(stderr, "Error: dyld shared cache does not contain slide info\n"); exit(1); } const dyld_cache_mapping_info* mappings = (const dyld_cache_mapping_info*)((char*)dyldCache + header->mappingOffset); const dyld_cache_mapping_info* dataMapping = &mappings[1]; uint64_t dataStartAddress = dataMapping->address; uint64_t dataSize = dataMapping->size; const dyld_cache_slide_info* slideInfoHeader = dyldCache->slideInfo(); printf("slide info version=%d\n", slideInfoHeader->version); if ( slideInfoHeader->version == 1 ) { printf("toc_count=%d, data page count=%lld\n", slideInfoHeader->toc_count, dataSize/4096); const dyld_cache_slide_info_entry* entries = (dyld_cache_slide_info_entry*)((char*)slideInfoHeader + slideInfoHeader->entries_offset); const uint16_t* tocs = (uint16_t*)((char*)slideInfoHeader + slideInfoHeader->toc_offset); for(int i=0; i < slideInfoHeader->toc_count; ++i) { printf("0x%08llX: [% 5d,% 5d] ", dataStartAddress + i*4096, i, tocs[i]); const dyld_cache_slide_info_entry* entry = &entries[tocs[i]]; for(int j=0; j < slideInfoHeader->entries_size; ++j) printf("%02X", entry->bits[j]); printf("\n"); } } else if ( slideInfoHeader->version == 2 ) { const dyld_cache_slide_info2* slideInfo = (dyld_cache_slide_info2*)(slideInfoHeader); printf("page_size=%d\n", slideInfo->page_size); printf("delta_mask=0x%016llX\n", slideInfo->delta_mask); printf("value_add=0x%016llX\n", slideInfo->value_add); printf("page_starts_count=%d, page_extras_count=%d\n", slideInfo->page_starts_count, slideInfo->page_extras_count); const uint16_t* starts = (uint16_t* )((char*)slideInfo + slideInfo->page_starts_offset); const uint16_t* extras = (uint16_t* )((char*)slideInfo + slideInfo->page_extras_offset); for (int i=0; i < slideInfo->page_starts_count; ++i) { const uint16_t start = starts[i]; auto rebaseChain = [&](uint8_t* pageContent, uint16_t startOffset) { uintptr_t slideAmount = 0; const uintptr_t deltaMask = (uintptr_t)(slideInfo->delta_mask); const uintptr_t valueMask = ~deltaMask; const uintptr_t valueAdd = (uintptr_t)(slideInfo->value_add); const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2; uint32_t pageOffset = startOffset; uint32_t delta = 1; while ( delta != 0 ) { uint8_t* loc = pageContent + pageOffset; uintptr_t rawValue = *((uintptr_t*)loc); delta = (uint32_t)((rawValue & deltaMask) >> deltaShift); uintptr_t value = (rawValue & valueMask); if ( value != 0 ) { value += valueAdd; value += slideAmount; } printf(" [% 5d + 0x%04llX]: 0x%016llX = 0x%016llX\n", i, (uint64_t)(pageOffset), (uint64_t)rawValue, (uint64_t)value); pageOffset += delta; } }; const uint8_t* dataPagesStart = dyldCache->dataRegionStart(); if ( start == DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE ) { printf("page[% 5d]: no rebasing\n", i); } else if ( start & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA ) { printf("page[% 5d]: ", i); int j=(start & 0x3FFF); bool done = false; do { uint16_t aStart = extras[j]; printf("start=0x%04X ", aStart & 0x3FFF); if ( options.mode == modeVerboseSlideInfo ) { uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i)); uint16_t pageStartOffset = (aStart & 0x3FFF)*4; rebaseChain(page, pageStartOffset); } done = (extras[j] & DYLD_CACHE_SLIDE_PAGE_ATTR_END); ++j; } while ( !done ); printf("\n"); } else { printf("page[% 5d]: start=0x%04X\n", i, starts[i]); if ( options.mode == modeVerboseSlideInfo ) { uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i)); uint16_t pageStartOffset = start*4; rebaseChain(page, pageStartOffset); } } } } else if ( slideInfoHeader->version == 3 ) { const dyld_cache_slide_info3* slideInfo = (dyld_cache_slide_info3*)(slideInfoHeader); printf("page_size=%d\n", slideInfo->page_size); printf("page_starts_count=%d\n", slideInfo->page_starts_count); printf("auth_value_add=0x%016llX\n", slideInfo->auth_value_add); const uintptr_t authValueAdd = (uintptr_t)(slideInfo->auth_value_add); const uint8_t* dataSegmentStart = dyldCache->dataRegionStart(); for (int i=0; i < slideInfo->page_starts_count; ++i) { uint16_t delta = slideInfo->page_starts[i]; if ( delta == DYLD_CACHE_SLIDE_V3_PAGE_ATTR_NO_REBASE ) { printf("page[% 5d]: no rebasing\n", i); continue; } printf("page[% 5d]: start=0x%04X\n", i, delta); if ( options.mode != modeVerboseSlideInfo ) continue; delta = delta/sizeof(uint64_t); // initial offset is byte based const uint8_t* pageStart = dataSegmentStart + (i * slideInfo->page_size); const dyld_cache_slide_pointer3* loc = (dyld_cache_slide_pointer3*)pageStart; do { loc += delta; delta = loc->plain.offsetToNextPointer; dyld3::MachOLoaded::ChainedFixupPointerOnDisk ptr; ptr.raw64 = *((uint64_t*)loc); if ( loc->auth.authenticated ) { uint64_t target = authValueAdd + loc->auth.offsetFromSharedCacheBase; uint64_t targetValue = ptr.arm64e.signPointer((void*)loc, target); printf(" [% 5d + 0x%04llX]: 0x%016llX (JOP: diversity %d, address %s, %s)\n", i, (uint64_t)((const uint8_t*)loc - pageStart), targetValue, ptr.arm64e.authBind.diversity, ptr.arm64e.authBind.addrDiv ? "true" : "false", ptr.arm64e.keyName()); } else { uint64_t targetValue = ptr.arm64e.unpackTarget(); printf(" [% 5d + 0x%04llX]: 0x%016llX\n", i, (uint64_t)((const uint8_t*)loc - pageStart), targetValue); } } while (delta != 0); } } else if ( slideInfoHeader->version == 4 ) { const dyld_cache_slide_info4* slideInfo = (dyld_cache_slide_info4*)(slideInfoHeader); printf("page_size=%d\n", slideInfo->page_size); printf("delta_mask=0x%016llX\n", slideInfo->delta_mask); printf("value_add=0x%016llX\n", slideInfo->value_add); printf("page_starts_count=%d, page_extras_count=%d\n", slideInfo->page_starts_count, slideInfo->page_extras_count); const uint16_t* starts = (uint16_t* )((char*)slideInfo + slideInfo->page_starts_offset); const uint16_t* extras = (uint16_t* )((char*)slideInfo + slideInfo->page_extras_offset); for (int i=0; i < slideInfo->page_starts_count; ++i) { const uint16_t start = starts[i]; auto rebaseChainV4 = [&](uint8_t* pageContent, uint16_t startOffset) { uintptr_t slideAmount = 0; const uintptr_t deltaMask = (uintptr_t)(slideInfo->delta_mask); const uintptr_t valueMask = ~deltaMask; const uintptr_t valueAdd = (uintptr_t)(slideInfo->value_add); const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2; uint32_t pageOffset = startOffset; uint32_t delta = 1; while ( delta != 0 ) { uint8_t* loc = pageContent + pageOffset; uint32_t rawValue = *((uint32_t*)loc); delta = (uint32_t)((rawValue & deltaMask) >> deltaShift); uintptr_t value = (rawValue & valueMask); if ( (value & 0xFFFF8000) == 0 ) { // small positive non-pointer, use as-is } else if ( (value & 0x3FFF8000) == 0x3FFF8000 ) { // small negative non-pointer value |= 0xC0000000; } else { value += valueAdd; value += slideAmount; } printf(" [% 5d + 0x%04X]: 0x%08X\n", i, pageOffset, rawValue); pageOffset += delta; } }; const uint8_t* dataPagesStart = dyldCache->dataRegionStart(); if ( start == DYLD_CACHE_SLIDE4_PAGE_NO_REBASE ) { printf("page[% 5d]: no rebasing\n", i); } else if ( start & DYLD_CACHE_SLIDE4_PAGE_USE_EXTRA ) { printf("page[% 5d]: ", i); int j=(start & DYLD_CACHE_SLIDE4_PAGE_INDEX); bool done = false; do { uint16_t aStart = extras[j]; printf("start=0x%04X ", aStart & DYLD_CACHE_SLIDE4_PAGE_INDEX); if ( options.mode == modeVerboseSlideInfo ) { uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i)); uint16_t pageStartOffset = (aStart & DYLD_CACHE_SLIDE4_PAGE_INDEX)*4; rebaseChainV4(page, pageStartOffset); } done = (extras[j] & DYLD_CACHE_SLIDE4_PAGE_EXTRA_END); ++j; } while ( !done ); printf("\n"); } else { printf("page[% 5d]: start=0x%04X\n", i, starts[i]); if ( options.mode == modeVerboseSlideInfo ) { uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i)); uint16_t pageStartOffset = start*4; rebaseChainV4(page, pageStartOffset); } } } } } else if ( options.mode == modeInfo ) { const dyld_cache_header* header = &dyldCache->header; printf("uuid: "); if ( header->mappingOffset >= 0x68 ) { const uint8_t* uuid = header->uuid; printf("%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\n", uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5], uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]); } else { printf("n/a\n"); } if ( header->mappingOffset >= 0xE0 ) { // HACK until this uses new header uint32_t platform = *((uint32_t*)(((char*)header) + 0xD8)); uint32_t bitfield = *((uint32_t*)(((char*)header) + 0xDC)); uint32_t simulator = bitfield & 0x200; uint32_t locallyBuiltCache = bitfield & 0x400; switch (platform) { case 1: printf("platform: macOS\n"); break; case 2: if ( simulator ) printf("platform: iOS simulator\n"); else printf("platform: iOS\n"); break; case 3: if ( simulator ) printf("platform: tvOS simulator\n"); else printf("platform: tvOS\n"); break; case 4: if ( simulator ) printf("platform: watchOS simulator\n"); else printf("platform: watchOS\n"); break; case 5: printf("platform: bridgeOS\n"); break; default: printf("platform: 0x%08X 0x%08X\n", platform, simulator); } printf("built by: %s\n", locallyBuiltCache ? "local machine" : "B&I"); } printf("cache type: %s\n", header->cacheType ? "production" : "development"); printf("image count: %u\n", header->imagesCount); if ( (header->mappingOffset >= 0x78) && (header->branchPoolsOffset != 0) ) { printf("branch pool count: %u\n", header->branchPoolsCount); } if ( header->slideInfoSize > 0 ) { uint32_t pageSize = 0x4000; // fix me for intel uint32_t possibleSlideValues = (uint32_t)(header->maxSlide/pageSize); uint32_t entropyBits = 32 - __builtin_clz(possibleSlideValues - 1); printf("ASLR entropy: %u-bits\n", entropyBits); } printf("mappings:\n"); const dyld_cache_mapping_info* mappings = (const dyld_cache_mapping_info*)((char*)dyldCache + header->mappingOffset); for (uint32_t i=0; i < header->mappingCount; ++i) { if ( mappings[i].initProt & VM_PROT_EXECUTE ) printf(" __TEXT %3lluMB, file offset: 0x%08llX -> 0x%08llX, address: 0x%08llX -> 0x%08llX\n", mappings[i].size/(1024*1024), mappings[i].fileOffset, mappings[i].fileOffset + mappings[i].size, mappings[i].address, mappings[i].address + mappings[i].size); else if ( mappings[i].initProt & VM_PROT_WRITE ) printf(" __DATA %3lluMB, file offset: 0x%08llX -> 0x%08llX, address: 0x%08llX -> 0x%08llX\n", mappings[i].size/(1024*1024), mappings[i].fileOffset, mappings[i].fileOffset + mappings[i].size, mappings[i].address, mappings[i].address + mappings[i].size); else if ( mappings[i].initProt & VM_PROT_READ ) printf(" __LINKEDIT %3lluMB, file offset: 0x%08llX -> 0x%08llX, address: 0x%08llX -> 0x%08llX\n", mappings[i].size/(1024*1024), mappings[i].fileOffset, mappings[i].fileOffset + mappings[i].size, mappings[i].address, mappings[i].address + mappings[i].size); } if ( header->codeSignatureOffset != 0 ) { uint64_t size = header->codeSignatureSize; uint64_t csAddr = mappings[header->mappingCount-1].address + mappings[header->mappingCount-1].size; if ( size != 0 ) printf(" code sign %3lluMB, file offset: 0x%08llX -> 0x%08llX, address: 0x%08llX -> 0x%08llX\n", size/(1024*1024), header->codeSignatureOffset, header->codeSignatureOffset + size, csAddr, csAddr + size); } printf("slide info: %4lluKB, file offset: 0x%08llX -> 0x%08llX\n", header->slideInfoSize/1024, header->slideInfoOffset, header->slideInfoOffset + header->slideInfoSize); if ( header->localSymbolsOffset != 0 ) printf("local symbols: %3lluMB, file offset: 0x%08llX -> 0x%08llX\n", header->localSymbolsSize/(1024*1024), header->localSymbolsOffset, header->localSymbolsOffset + header->localSymbolsSize); if ( (header->mappingOffset >= 0x78) && (header->accelerateInfoSize != 0) ) printf("accelerate tab: %3lluKB, address: 0x%08llX -> 0x%08llX\n", header->accelerateInfoSize/1024, header->accelerateInfoAddr, header->accelerateInfoAddr + header->accelerateInfoSize); } else if ( options.mode == modeAcceleratorInfo ) { const dyld_cache_header* header = &dyldCache->header; if ( (header->mappingOffset < sizeof(dyld_cache_header)) || (header->accelerateInfoSize == 0) ) { printf("no accelerator info\n"); } else { const dyld_cache_mapping_info* mappings = (const dyld_cache_mapping_info*)((char*)dyldCache + header->mappingOffset); uint64_t aiAddr = header->accelerateInfoAddr; const dyld_cache_accelerator_info* accelInfo = NULL; for (uint32_t i=0; i < header->mappingCount; ++i) { if ( (mappings[i].address <= aiAddr) && (aiAddr < mappings[i].address+mappings[i].size) ) { uint64_t offset = aiAddr - mappings[i].address + mappings[i].fileOffset; accelInfo = (dyld_cache_accelerator_info*)((uint8_t*)dyldCache + offset); } } if ( accelInfo == NULL ) { printf("accelerator info not in any mapped range\n"); } else { const dyld_cache_image_info* images = (dyld_cache_image_info*)((char*)dyldCache + header->imagesOffset); const dyld_cache_image_info_extra* imagesExtra = (dyld_cache_image_info_extra*)((char*)accelInfo + accelInfo->imagesExtrasOffset); const uint16_t* dependencyArray = (uint16_t*)((char*)accelInfo + accelInfo->depListOffset); const uint16_t* reExportArray = (uint16_t*)((char*)accelInfo + accelInfo->reExportListOffset); printf("extra image info (count=%u):\n", accelInfo->imageExtrasCount); for (uint32_t i=0; i < accelInfo->imageExtrasCount; ++i) { printf(" image[%3u] %s:\n", i, (char*)dyldCache +images[i].pathFileOffset); printf(" exports trie: addr=0x%llX, size=0x%08X\n", imagesExtra[i].exportsTrieAddr, imagesExtra[i].exportsTrieSize); if ( imagesExtra[i].weakBindingsSize ) printf(" weak bind info: addr=0x%llX, size=0x%08X\n", imagesExtra[i].weakBindingsAddr, imagesExtra[i].weakBindingsSize); printf(" dependents: "); for (uint32_t d=imagesExtra[i].dependentsStartArrayIndex; dependencyArray[d] != 0xFFFF; ++d) { uint16_t depIndex = dependencyArray[d]; if ( depIndex & 0x8000 ) printf(" up(%d) ", depIndex & 0x7FFF); else printf(" %d ", depIndex); } printf("\n"); printf(" re-exports: "); for (uint32_t r=imagesExtra[i].reExportsStartArrayIndex; reExportArray[r] != 0xFFFF; ++r) printf(" %d ", reExportArray[r]); printf("\n"); } printf("libdyld.dylib:\n"); printf(" __dyld section address: 0x%llX\n", accelInfo->dyldSectionAddr); printf("initializers (count=%u):\n", accelInfo->initializersCount); const dyld_cache_accelerator_initializer* initializers = (dyld_cache_accelerator_initializer*)((char*)accelInfo + accelInfo->initializersOffset); for (uint32_t i=0; i < accelInfo->initializersCount; ++i) { printf(" image[%3u] 0x%llX\n", initializers[i].imageIndex, mappings[0].address + initializers[i].functionOffset); } printf("DOF sections (count=%u):\n", accelInfo->dofSectionsCount); const dyld_cache_accelerator_dof* dofs = (dyld_cache_accelerator_dof*)((char*)accelInfo + accelInfo->dofSectionsOffset); for (uint32_t i=0; i < accelInfo->dofSectionsCount; ++i) { printf(" image[%3u] 0x%llX -> 0x%llX\n", dofs[i].imageIndex, dofs[i].sectionAddress, dofs[i].sectionAddress+dofs[i].sectionSize); } printf("bottom up order (count=%u):\n", accelInfo->imageExtrasCount); const uint16_t* bottomUpArray = (uint16_t*)((char*)accelInfo + accelInfo->bottomUpListOffset); for (uint32_t i=0; i < accelInfo->imageExtrasCount; ++i) { unsigned imageIndex = bottomUpArray[i]; if ( imageIndex < accelInfo->imageExtrasCount ) printf(" image[%3u] %s\n", imageIndex, (char*)dyldCache + images[imageIndex].pathFileOffset); else printf(" image[%3u] BAD INDEX\n", imageIndex); } printf("range table (count=%u):\n", accelInfo->rangeTableCount); const dyld_cache_range_entry* rangeTable = (dyld_cache_range_entry*)((char*)accelInfo + accelInfo->rangeTableOffset); for (uint32_t i=0; i < accelInfo->rangeTableCount; ++i) { const dyld_cache_range_entry& entry = rangeTable[i]; printf(" 0x%llX -> 0x%llX %s\n", entry.startAddress, entry.startAddress + entry.size, (char*)dyldCache + images[entry.imageIndex].pathFileOffset); } printf("dylib trie (size=%u):\n", accelInfo->dylibTrieSize); const uint8_t* dylibTrieStart = (uint8_t*)accelInfo + accelInfo->dylibTrieOffset; const uint8_t* dylibTrieEnd = dylibTrieStart + accelInfo->dylibTrieSize; std::vector<DylibIndexTrie::Entry> dylibEntries; if ( !Trie<DylibIndex>::parseTrie(dylibTrieStart, dylibTrieEnd, dylibEntries) ) printf(" malformed dylibs trie\n"); for (const DylibIndexTrie::Entry& x : dylibEntries) { printf(" image[%3u] %s\n", x.info.index, x.name.c_str()); } } } } else if ( options.mode == modeTextInfo ) { const dyld_cache_header* header = &dyldCache->header; if ( (header->mappingOffset < sizeof(dyld_cache_header)) || (header->imagesTextCount == 0) ) { printf("no text info\n"); } else { const dyld_cache_image_text_info* imagesText = (dyld_cache_image_text_info*)((char*)dyldCache + header->imagesTextOffset); const dyld_cache_image_text_info* imagesTextEnd = &imagesText[header->imagesTextCount]; printf("dylib text infos (count=%llu):\n", header->imagesTextCount); for (const dyld_cache_image_text_info* p=imagesText; p < imagesTextEnd; ++p) { printf(" 0x%09llX -> 0x%09llX <", p->loadAddress, p->loadAddress + p->textSegmentSize); for (int i=0; i<16; ++i) { switch (i) { case 4: case 6: case 8: case 10: printf("-"); break; } printf("%02X", p->uuid[i]); } printf("> %s\n", (char*)dyldCache + p->pathOffset); } } } else if ( options.mode == modeLocalSymbols ) { const dyld_cache_header* header = &dyldCache->header; if ( header->localSymbolsOffset == 0 ) { fprintf(stderr, "Error: dyld shared cache does not contain local symbols info\n"); exit(1); } const bool is64 = (strstr((char*)dyldCache, "64") != NULL); const dyld_cache_image_info* imageInfos = (dyld_cache_image_info*)((char*)dyldCache + header->imagesOffset); const dyld_cache_local_symbols_info* localsInfo = (dyld_cache_local_symbols_info*)((char*)dyldCache + header->localSymbolsOffset); const uint32_t nlistFileOffset = (uint32_t)(header->localSymbolsOffset + localsInfo->nlistOffset); const uint32_t nlistCount = localsInfo->nlistCount; const uint32_t nlistByteSize = is64 ? nlistCount*16 : nlistCount*12; const uint32_t stringsFileOffset = (uint32_t)(header->localSymbolsOffset + localsInfo->stringsOffset); const uint32_t stringsSize = localsInfo->stringsSize; const uint32_t entriesCount = localsInfo->entriesCount; const dyld_cache_local_symbols_entry* entries = (dyld_cache_local_symbols_entry*)((char*)localsInfo + localsInfo->entriesOffset); printf("local symbols nlist array: %3uMB, file offset: 0x%08X -> 0x%08X\n", nlistByteSize/(1024*1024), nlistFileOffset, nlistFileOffset+nlistByteSize); printf("local symbols string pool: %3uMB, file offset: 0x%08X -> 0x%08X\n", stringsSize/(1024*1024), stringsFileOffset, stringsFileOffset+stringsSize); printf("local symbols by dylib (count=%d):\n", entriesCount); //const char* stringPool = (char*)dyldCache + stringsFileOffset; for (int i=0; i < entriesCount; ++i) { const char* imageName = (char*)dyldCache + imageInfos[i].pathFileOffset; printf(" nlistStartIndex=%5d, nlistCount=%5d, image=%s\n", entries[i].nlistStartIndex, entries[i].nlistCount, imageName); #if 0 if ( is64 ) { const nlist_64* symTab = (nlist_64*)((char*)dyldCache + nlistFileOffset); for (int e=0; e < entries[i].nlistCount(); ++e) { const nlist_64* entry = &symTab[entries[i].nlistStartIndex()+e]; printf(" nlist[%d].str=%d, %s\n", e, entry->n_un.n_strx, &stringPool[entry->n_un.n_strx]); printf(" nlist[%d].value=0x%0llX\n", e, entry->n_value); } } #endif } } else if ( options.mode == modeJSONMap ) { std::string buffer = dyldCache->generateJSONMap("unknown"); printf("%s\n", buffer.c_str()); } else if ( options.mode == modeJSONDependents ) { std::cout << dyldCache->generateJSONDependents(); } else if ( options.mode == modeStrings ) { if (printStrings) { dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; int64_t slide = ma->getSlide(); ma->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo& info, bool malformedSectionRange, bool& stop) { if ( ( (info.sectFlags & SECTION_TYPE) == S_CSTRING_LITERALS ) ) { if ( malformedSectionRange ) { stop = true; return; } const uint8_t* content = (uint8_t*)(info.sectAddr + slide); const char* s = (char*)content; const char* end = s + info.sectSize; while ( s < end ) { printf("%s: %s\n", ma->installName(), s); while (*s != '\0' ) ++s; ++s; } } }); }); } if (printExports) { dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; uint32_t exportTrieRuntimeOffset; uint32_t exportTrieSize; if ( ma->hasExportTrie(exportTrieRuntimeOffset, exportTrieSize) ) { const uint8_t* start = (uint8_t*)mh + exportTrieRuntimeOffset; const uint8_t* end = start + exportTrieSize; std::vector<ExportInfoTrie::Entry> exports; if ( !ExportInfoTrie::parseTrie(start, end, exports) ) { return; } for (const ExportInfoTrie::Entry& entry: exports) { printf("%s: %s\n", ma->installName(), entry.name.c_str()); } } }); } } else if ( options.mode == modeSectionSizes ) { __block std::map<std::string, uint64_t> sectionSizes; dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; ma->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo §Info, bool malformedSectionRange, bool &stop) { std::string section = std::string(sectInfo.segInfo.segName) + " " + sectInfo.sectName; sectionSizes[section] += sectInfo.sectSize; }); }); for (const auto& keyAndValue : sectionSizes) { printf("%lld %s\n", keyAndValue.second, keyAndValue.first.c_str()); } } else if ( options.mode == modeObjCProtocols ) { if ( dyldCache->objcOpt() == nullptr ) { fprintf(stderr, "Error: could not get optimized objc\n"); return 1; } objc_opt::objc_protocolopt2_t* protocols = dyldCache->objcOpt()->protocolopt2(); if ( protocols == nullptr ) { fprintf(stderr, "Error: could not get optimized objc protocols\n"); return 1; } for (uint64_t index = 0; index != protocols->capacity; ++index) { const objc_opt::objc_classheader_t& clshi = protocols->classOffsets()[index]; if ( clshi.clsOffset == 0 ) { fprintf(stderr, "[% 5lld]\n", index); continue; } const char* name = (const char*)(((const uint8_t*)protocols) + protocols->offsets()[index]); if ( !clshi.isDuplicate() ) { fprintf(stderr, "[% 5lld] -> (% 8d, % 8d) = %s\n", index, clshi.clsOffset, clshi.hiOffset, name); continue; } // class appears in more than one header uint32_t count = clshi.duplicateCount(); fprintf(stderr, "[% 5lld] -> duplicates [% 5d..% 5d] = %s\n", index, clshi.duplicateIndex(), clshi.duplicateIndex() + clshi.duplicateCount() - 1, name); const objc_opt::objc_classheader_t *list = &protocols->duplicateOffsets()[clshi.duplicateIndex()]; for (uint32_t i = 0; i < count; i++) { fprintf(stderr, " - [% 5lld] -> (% 8d, % 8d)\n", (uint64_t)(clshi.duplicateIndex() + i), list[i].clsOffset, list[i].hiOffset); } } } else if ( options.mode == modeObjCClasses ) { using dyld3::json::Node; using ObjCClassInfo = dyld3::MachOAnalyzer::ObjCClassInfo; const bool rebased = false; // Build a map of class vm addrs to their names so that categories know the // name of the class they are attaching to __block std::map<uint64_t, const char*> classVMAddrToName; __block std::map<uint64_t, const char*> metaclassVMAddrToName; dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; const uint32_t pointerSize = ma->pointerSize(); auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { dyld3::MachOAnalyzer::PrintableStringResult classNameResult; const char* className = ma->getPrintableString(objcClass.nameVMAddr(pointerSize), classNameResult); if (classNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; if (isMetaClass) metaclassVMAddrToName[classVMAddr] = className; else classVMAddrToName[classVMAddr] = className; }; Diagnostics diag; ma->forEachObjCClass(diag, rebased, visitClass); }); // These are used only for the on-disk binaries we analyze __block std::vector<const char*> onDiskChainedFixupBindTargets; __block std::map<uint64_t, const char*> onDiskClassVMAddrToName; __block std::map<uint64_t, const char*> onDiskMetaclassVMAddrToName; __block Node root; auto makeNode = [](std::string str) -> Node { Node node; node.value = str; return node; }; auto getProperties = ^(const dyld3::MachOAnalyzer* ma, uint64_t propertiesVMAddr) { __block Node propertiesNode; auto visitProperty = ^(uint64_t propertyVMAddr, const dyld3::MachOAnalyzer::ObjCProperty& property) { // Get the name dyld3::MachOAnalyzer::PrintableStringResult propertyNameResult; const char* propertyName = ma->getPrintableString(property.nameVMAddr, propertyNameResult); if (propertyNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; // Get the attributes dyld3::MachOAnalyzer::PrintableStringResult propertyAttributesResult; const char* propertyAttributes = ma->getPrintableString(property.attributesVMAddr, propertyAttributesResult); if (propertyAttributesResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; Node propertyNode; propertyNode.map["name"] = makeNode(propertyName); propertyNode.map["attributes"] = makeNode(propertyAttributes); propertiesNode.array.push_back(propertyNode); }; ma->forEachObjCProperty(propertiesVMAddr, rebased, visitProperty); return propertiesNode.array.empty() ? std::optional<Node>() : propertiesNode; }; auto getClasses = ^(const dyld3::MachOAnalyzer* ma) { Diagnostics diag; const uint32_t pointerSize = ma->pointerSize(); __block Node classesNode; __block bool skippedPreviousClass = false; auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { if (isMetaClass) { if (skippedPreviousClass) { // If the class was bad, then skip the meta class too skippedPreviousClass = false; return; } } else { skippedPreviousClass = true; } std::string classType = "-"; if (isMetaClass) classType = "+"; dyld3::MachOAnalyzer::PrintableStringResult classNameResult; const char* className = ma->getPrintableString(objcClass.nameVMAddr(pointerSize), classNameResult); if (classNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) { return; } const char* superClassName = nullptr; if ( ma->inDyldCache() ) { if ( objcClass.superclassVMAddr != 0 ) { if (isMetaClass) { // If we are root class, then our superclass should actually point to our own class const uint32_t RO_ROOT = (1<<1); if ( objcClass.flags(pointerSize) & RO_ROOT ) { auto it = classVMAddrToName.find(objcClass.superclassVMAddr); assert(it != classVMAddrToName.end()); superClassName = it->second; } else { auto it = metaclassVMAddrToName.find(objcClass.superclassVMAddr); assert(it != metaclassVMAddrToName.end()); superClassName = it->second; } } else { auto it = classVMAddrToName.find(objcClass.superclassVMAddr); assert(it != classVMAddrToName.end()); superClassName = it->second; } } } else { // On-disk binary. Lets crack the chain to work out what we are pointing at dyld3::MachOAnalyzer::ChainedFixupPointerOnDisk fixup; fixup.raw64 = objcClass.superclassVMAddr; assert(!fixup.arm64e.authBind.auth); if (fixup.arm64e.bind.bind) { // Bind to another image. Use the bind table to work out which name to bind to const char* symbolName = onDiskChainedFixupBindTargets[fixup.arm64e.bind.ordinal]; if (isMetaClass) { if ( strstr(symbolName, "_OBJC_METACLASS_$_") == symbolName ) { superClassName = symbolName + strlen("_OBJC_METACLASS_$_"); } else { // Swift classes don't start with these prefixes so just skip them if (objcClass.isSwiftLegacy || objcClass.isSwiftStable) return; } } else { if ( strstr(symbolName, "_OBJC_CLASS_$_") == symbolName ) { superClassName = symbolName + strlen("_OBJC_CLASS_$_"); } else { // Swift classes don't start with these prefixes so just skip them if (objcClass.isSwiftLegacy || objcClass.isSwiftStable) return; } } } else { // Rebase within this image. if (isMetaClass) { auto it = onDiskMetaclassVMAddrToName.find(objcClass.superclassVMAddr); assert(it != onDiskMetaclassVMAddrToName.end()); superClassName = it->second; } else { auto it = onDiskClassVMAddrToName.find(objcClass.superclassVMAddr); assert(it != onDiskClassVMAddrToName.end()); superClassName = it->second; } } } // Print the methods on this class __block Node methodsNode; auto visitMethod = ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { dyld3::MachOAnalyzer::PrintableStringResult methodNameResult; const char* methodName = ma->getPrintableString(method.nameVMAddr, methodNameResult); if (methodNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; methodsNode.array.push_back(makeNode(classType + methodName)); }; ma->forEachObjCMethod(objcClass.baseMethodsVMAddr(pointerSize), rebased, visitMethod); std::optional<Node> properties = getProperties(ma, objcClass.basePropertiesVMAddr(pointerSize)); if (isMetaClass) { assert(!classesNode.array.empty()); Node& currentClassNode = classesNode.array.back(); assert(currentClassNode.map["className"].value == className); if (!methodsNode.array.empty()) { Node& currentMethodsNode = currentClassNode.map["methods"]; currentMethodsNode.array.insert(currentMethodsNode.array.end(), methodsNode.array.begin(), methodsNode.array.end()); } if (properties.has_value()) { Node& currentPropertiesNode = currentClassNode.map["properties"]; currentPropertiesNode.array.insert(currentPropertiesNode.array.end(), properties->array.begin(), properties->array.end()); } return; } Node currentClassNode; currentClassNode.map["className"] = makeNode(className); if ( superClassName != nullptr ) currentClassNode.map["superClassName"] = makeNode(superClassName); if (!methodsNode.array.empty()) currentClassNode.map["methods"] = methodsNode; if (properties.has_value()) currentClassNode.map["properties"] = properties.value(); // We didn't skip this class so mark it as such skippedPreviousClass = false; classesNode.array.push_back(currentClassNode); }; ma->forEachObjCClass(diag, rebased, visitClass); return classesNode.array.empty() ? std::optional<Node>() : classesNode; }; auto getCategories = ^(const dyld3::MachOAnalyzer* ma) { Diagnostics diag; __block Node categoriesNode; auto visitCategory = ^(Diagnostics& diag, uint64_t categoryVMAddr, const dyld3::MachOAnalyzer::ObjCCategory& objcCategory) { dyld3::MachOAnalyzer::PrintableStringResult categoryNameResult; const char* categoryName = ma->getPrintableString(objcCategory.nameVMAddr, categoryNameResult); if (categoryNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; const char* className = nullptr; if ( ma->inDyldCache() ) { auto it = classVMAddrToName.find(objcCategory.clsVMAddr); assert(it != classVMAddrToName.end()); className = it->second; } else { // On-disk binary. Lets crack the chain to work out what we are pointing at dyld3::MachOAnalyzer::ChainedFixupPointerOnDisk fixup; fixup.raw64 = objcCategory.clsVMAddr; assert(!fixup.arm64e.authBind.auth); if (fixup.arm64e.bind.bind) { // Bind to another image. Use the bind table to work out which name to bind to const char* symbolName = onDiskChainedFixupBindTargets[fixup.arm64e.bind.ordinal]; if ( strstr(symbolName, "_OBJC_CLASS_$_") == symbolName ) { className = symbolName + strlen("_OBJC_CLASS_$_"); } else { // Swift classes don't start with these prefixes so just skip them // We don't know that this is a Swift class/category though, but skip it anyway return; } } else { auto it = onDiskClassVMAddrToName.find(objcCategory.clsVMAddr); if (it == onDiskClassVMAddrToName.end()) { // This is an odd binary with perhaps a Swift class. Just skip this entry return; } className = it->second; } } // Print the instance methods on this category __block Node methodsNode; auto visitInstanceMethod = ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { dyld3::MachOAnalyzer::PrintableStringResult methodNameResult; const char* methodName = ma->getPrintableString(method.nameVMAddr, methodNameResult); if (methodNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; methodsNode.array.push_back(makeNode(std::string("-") + methodName)); }; ma->forEachObjCMethod(objcCategory.instanceMethodsVMAddr, rebased, visitInstanceMethod); // Print the instance methods on this category __block Node classMethodsNode; auto visitClassMethod = ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { dyld3::MachOAnalyzer::PrintableStringResult methodNameResult; const char* methodName = ma->getPrintableString(method.nameVMAddr, methodNameResult); if (methodNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; methodsNode.array.push_back(makeNode(std::string("+") + methodName)); }; ma->forEachObjCMethod(objcCategory.classMethodsVMAddr, rebased, visitClassMethod); Node currentCategoryNode; currentCategoryNode.map["categoryName"] = makeNode(categoryName); currentCategoryNode.map["className"] = makeNode(className); if (!methodsNode.array.empty()) currentCategoryNode.map["methods"] = methodsNode; if (std::optional<Node> properties = getProperties(ma, objcCategory.instancePropertiesVMAddr)) currentCategoryNode.map["properties"] = properties.value(); categoriesNode.array.push_back(currentCategoryNode); }; ma->forEachObjCCategory(diag, rebased, visitCategory); return categoriesNode.array.empty() ? std::optional<Node>() : categoriesNode; }; dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; Node imageRecord; imageRecord.map["imagePath"] = makeNode(installName); imageRecord.map["imageType"] = makeNode("cache-dylib"); std::optional<Node> classes = getClasses(ma); std::optional<Node> categories = getCategories(ma); // Skip emitting images with no objc data if (!classes.has_value() && !categories.has_value()) return; if (classes.has_value()) imageRecord.map["classes"] = classes.value(); if (categories.has_value()) imageRecord.map["categories"] = categories.value(); root.array.push_back(imageRecord); }); FileSystemPhysical fileSystem; dyld3::Platform platform = dyldCache->platform(); const dyld3::GradedArchs& archs = dyld3::GradedArchs::forName(dyldCache->archName(), true); dyldCache->forEachLaunchClosure(^(const char *executableRuntimePath, const dyld3::closure::LaunchClosure *closure) { Diagnostics diag; char realerPath[MAXPATHLEN]; dyld3::closure::LoadedFileInfo loadedFileInfo = dyld3::MachOAnalyzer::load(diag, fileSystem, executableRuntimePath, archs, platform, realerPath); const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)loadedFileInfo.fileContent; uint32_t pointerSize = ma->pointerSize(); // Populate the bind targets for classes from other images onDiskChainedFixupBindTargets.clear(); ma->forEachChainedFixupTarget(diag, ^(int libOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) { onDiskChainedFixupBindTargets.push_back(symbolName); }); if ( diag.hasError() ) return; // Populate the rebase targets for class names onDiskMetaclassVMAddrToName.clear(); onDiskClassVMAddrToName.clear(); auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { dyld3::MachOAnalyzer::PrintableStringResult classNameResult; const char* className = ma->getPrintableString(objcClass.nameVMAddr(pointerSize), classNameResult); if (classNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; if (isMetaClass) onDiskMetaclassVMAddrToName[classVMAddr] = className; else onDiskClassVMAddrToName[classVMAddr] = className; }; ma->forEachObjCClass(diag, rebased, visitClass); Node imageRecord; imageRecord.map["imagePath"] = makeNode(executableRuntimePath); imageRecord.map["imageType"] = makeNode("executable"); std::optional<Node> classes = getClasses(ma); std::optional<Node> categories = getCategories(ma); // Skip emitting images with no objc data if (!classes.has_value() && !categories.has_value()) return; if (classes.has_value()) imageRecord.map["classes"] = classes.value(); if (categories.has_value()) imageRecord.map["categories"] = categories.value(); root.array.push_back(imageRecord); }); dyldCache->forEachDlopenImage(^(const char *runtimePath, const dyld3::closure::Image *image) { Diagnostics diag; char realerPath[MAXPATHLEN]; dyld3::closure::LoadedFileInfo loadedFileInfo = dyld3::MachOAnalyzer::load(diag, fileSystem, runtimePath, archs, platform, realerPath); const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)loadedFileInfo.fileContent; uint32_t pointerSize = ma->pointerSize(); // Populate the bind targets for classes from other images onDiskChainedFixupBindTargets.clear(); ma->forEachChainedFixupTarget(diag, ^(int libOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) { onDiskChainedFixupBindTargets.push_back(symbolName); }); if ( diag.hasError() ) return; // Populate the rebase targets for class names onDiskMetaclassVMAddrToName.clear(); onDiskClassVMAddrToName.clear(); auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { dyld3::MachOAnalyzer::PrintableStringResult classNameResult; const char* className = ma->getPrintableString(objcClass.nameVMAddr(pointerSize), classNameResult); if (classNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; if (isMetaClass) onDiskMetaclassVMAddrToName[classVMAddr] = className; else onDiskClassVMAddrToName[classVMAddr] = className; }; ma->forEachObjCClass(diag, rebased, visitClass); Node imageRecord; imageRecord.map["imagePath"] = makeNode(runtimePath); imageRecord.map["imageType"] = makeNode("non-cache-dylib"); std::optional<Node> classes = getClasses(ma); std::optional<Node> categories = getCategories(ma); // Skip emitting images with no objc data if (!classes.has_value() && !categories.has_value()) return; if (classes.has_value()) imageRecord.map["classes"] = classes.value(); if (categories.has_value()) imageRecord.map["categories"] = categories.value(); root.array.push_back(imageRecord); }); dyld3::json::printJSON(root, 0, std::cout); } else if ( options.mode == modeObjCSelectors ) { if ( dyldCache->objcOpt() == nullptr ) { fprintf(stderr, "Error: could not get optimized objc\n"); return 1; } const objc_opt::objc_selopt_t* selectors = dyldCache->objcOpt()->selopt(); if ( selectors == nullptr ) { fprintf(stderr, "Error: could not get optimized objc selectors\n"); return 1; } std::vector<const char*> selNames; for (uint64_t index = 0; index != selectors->capacity; ++index) { objc_opt::objc_stringhash_offset_t offset = selectors->offsets()[index]; if ( offset == 0 ) continue; const char* selName = selectors->getEntryForIndex((uint32_t)index); selNames.push_back(selName); } std::sort(selNames.begin(), selNames.end(), [](const char* a, const char* b) { // Sort by offset, not string value return a < b; }); auto makeNode = [](std::string str) { dyld3::json::Node node; node.value = str; return node; }; dyld3::json::Node root; for (const char* selName : selNames) { dyld3::json::Node selNode; selNode.map["selectorName"] = makeNode(selName); selNode.map["offset"] = makeNode(dyld3::json::decimal((uint64_t)selName - (uint64_t)dyldCache)); root.array.push_back(selNode); } dyld3::json::printJSON(root, 0, std::cout); } else if ( options.mode == modeExtract ) { char pathBuffer[PATH_MAX]; uint32_t bufferSize = PATH_MAX; if ( _NSGetExecutablePath(pathBuffer, &bufferSize) != 0 ) { fprintf(stderr, "Error: could not get path of program\n"); return 1; } char* last = strrchr(pathBuffer, '/'); // The bundle is at a different location on device. Its /usr/lib/dsc_extractor.bundle in the SDK // but /usr/local/lib/dsc_extractor.bundle on device. strcpy(last+1, DSC_BUNDLE_REL_PATH); void* handle = dlopen(pathBuffer, RTLD_LAZY); if ( handle == NULL ) { fprintf(stderr, "Error: dsc_extractor.bundle could not be loaded at %s\n", pathBuffer); return 1; } typedef int (*extractor_proc)(const char* shared_cache_file_path, const char* extraction_root_path, void (^progress)(unsigned current, unsigned total)); extractor_proc proc = (extractor_proc)dlsym(handle, "dyld_shared_cache_extract_dylibs_progress"); if ( proc == NULL ) { fprintf(stderr, "Error: dsc_extractor.bundle did not have dyld_shared_cache_extract_dylibs_progress symbol\n"); return 1; } int result = (*proc)(sharedCachePath, options.extractionDir, ^(unsigned c, unsigned total) { } ); return result; } else { switch ( options.mode ) { case modeList: { if (options.printInodes) { dyldCache->forEachImageEntry(^(const char* path, uint64_t mTime, uint64_t inode) { printf("0x%08llX 0x%08llX ", inode, mTime); if ( isAlias(path, dyldCache) ) printf("[alias] %s\n", path); else printf("%s\n", path); }); } else { dyldCache->forEachImageTextSegment(^(uint64_t loadAddressUnslid, uint64_t textSegmentSize, const unsigned char *dylibUUID, const char *installName, bool &stop) { if ( options.printVMAddrs ) printf("0x%08llX ", loadAddressUnslid); if ( options.printUUIDs ) { const uint8_t* uuid = (uint8_t*)dylibUUID; printf("<%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X> ", uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5], uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]); } if ( isAlias(installName, dyldCache) ) printf("[alias] %s\n", installName); else printf("%s\n", installName); }); } break; } case modeMap: { __block std::map<uint64_t, const char*> dataSegNames; __block std::map<uint64_t, uint64_t> dataSegEnds; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { dyld3::MachOFile* mf = (dyld3::MachOFile*)mh; mf->forEachSegment(^(const dyld3::MachOAnalyzer::SegmentInfo &info, bool &stop) { if ( isAlias(installName, dyldCache) ) return; printf("0x%08llX - 0x%08llX %s %s\n", info.vmAddr, info.vmAddr + info.vmSize, info.segName, installName); if ( strncmp(info.segName, "__DATA", 6) == 0 ) { dataSegNames[info.vmAddr] = installName; dataSegEnds[info.vmAddr] = info.vmAddr + info.vmSize; } }); }); // <rdar://problem/51084507> Enhance dyld_shared_cache_util to show where section alignment added padding uint64_t lastEnd = 0; for (const auto& entry : dataSegEnds) { uint64_t padding = entry.first - lastEnd; if ( (padding > 32) && (lastEnd != 0) ) { printf("0x%08llX - 0x%08llX PADDING %lluKB\n", lastEnd, entry.first, padding/1024); } lastEnd = entry.second; } break; } case modeDependencies: { __block bool dependentTargetFound = false; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { if ( strcmp(options.dependentsOfPath, installName) != 0 ) return; dependentTargetFound = true; auto printDep = [&options](const char *loadPath, uint32_t compatVersion, uint32_t curVersion) { if ( options.printDylibVersions ) { uint32_t compat_vers = compatVersion; uint32_t current_vers = curVersion; printf("\t%s", loadPath); if ( compat_vers != 0xFFFFFFFF ) { printf("(compatibility version %u.%u.%u, current version %u.%u.%u)\n", (compat_vers >> 16), (compat_vers >> 8) & 0xff, (compat_vers) & 0xff, (current_vers >> 16), (current_vers >> 8) & 0xff, (current_vers) & 0xff); } else { printf("\n"); } } else { printf("\t%s\n", loadPath); } }; dyld3::MachOFile* mf = (dyld3::MachOFile*)mh; // First print out our dylib and version. const char* dylibInstallName; uint32_t currentVersion; uint32_t compatVersion; if ( mf->getDylibInstallName(&dylibInstallName, &compatVersion, ¤tVersion) ) { printDep(dylibInstallName, compatVersion, currentVersion); } // Then the dependent dylibs. mf->forEachDependentDylib(^(const char *loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool &stop) { printDep(loadPath, compatVersion, curVersion); }); }); if (options.dependentsOfPath && !dependentTargetFound) { fprintf(stderr, "Error: could not find '%s' in the shared cache at\n %s\n", options.dependentsOfPath, sharedCachePath); exit(1); } break; } case modeLinkEdit: { std::map<uint32_t, const char*> pageToContent; auto add_linkedit = [&pageToContent](uint32_t pageStart, uint32_t pageEnd, const char* message) { for (uint32_t p = pageStart; p <= pageEnd; p += 4096) { std::map<uint32_t, const char*>::iterator pos = pageToContent.find(p); if ( pos == pageToContent.end() ) { pageToContent[p] = strdup(message); } else { const char* oldMessage = pos->second; char* newMesssage; asprintf(&newMesssage, "%s, %s", oldMessage, message); pageToContent[p] = newMesssage; ::free((void*)oldMessage); } } }; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { // Filter out symlinks. if (isAlias(installName, dyldCache)) return; dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; Diagnostics diag; dyld3::MachOAnalyzer::LinkEditInfo leInfo; ma->getLinkEditPointers(diag, leInfo); if (diag.hasError()) return; char message[1000]; const char* shortName = strrchr(installName, '/') + 1; // add export trie info if ( leInfo.dyldInfo->export_size != 0 ) { //printf("export_off=0x%X\n", leInfo.dyldInfo->export_off()); uint32_t exportPageOffsetStart = leInfo.dyldInfo->export_off & (-4096); uint32_t exportPageOffsetEnd = (leInfo.dyldInfo->export_off + leInfo.dyldInfo->export_size) & (-4096); sprintf(message, "exports from %s", shortName); add_linkedit(exportPageOffsetStart, exportPageOffsetEnd, message); } // add binding info if ( leInfo.dyldInfo->bind_size != 0 ) { uint32_t bindPageOffsetStart = leInfo.dyldInfo->bind_off & (-4096); uint32_t bindPageOffsetEnd = (leInfo.dyldInfo->bind_off + leInfo.dyldInfo->bind_size) & (-4096); sprintf(message, "bindings from %s", shortName); add_linkedit(bindPageOffsetStart, bindPageOffsetEnd, message); } // add lazy binding info if ( leInfo.dyldInfo->lazy_bind_size != 0 ) { uint32_t lazybindPageOffsetStart = leInfo.dyldInfo->lazy_bind_off & (-4096); uint32_t lazybindPageOffsetEnd = (leInfo.dyldInfo->lazy_bind_off + leInfo.dyldInfo->lazy_bind_size) & (-4096); sprintf(message, "lazy bindings from %s", shortName); add_linkedit(lazybindPageOffsetStart, lazybindPageOffsetEnd, message); } // add weak binding info if ( leInfo.dyldInfo->weak_bind_size != 0 ) { uint32_t weakbindPageOffsetStart = leInfo.dyldInfo->weak_bind_off & (-4096); uint32_t weakbindPageOffsetEnd = (leInfo.dyldInfo->weak_bind_off + leInfo.dyldInfo->weak_bind_size) & (-4096); sprintf(message, "weak bindings from %s", shortName); add_linkedit(weakbindPageOffsetStart, weakbindPageOffsetEnd, message); } }); for (std::map<uint32_t, const char*>::iterator it = pageToContent.begin(); it != pageToContent.end(); ++it) { printf("0x%08X %s\n", it->first, it->second); } break; } case modeSize: { struct TextInfo { uint64_t textSize; const char* path; }; __block std::vector<TextInfo> textSegments; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { // Filter out symlinks. if (isAlias(installName, dyldCache)) return; dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; ma->forEachSegment(^(const dyld3::MachOAnalyzer::SegmentInfo &info, bool &stop) { if ( strcmp(info.segName, "__TEXT") != 0 ) return; textSegments.push_back({ info.fileSize, installName }); }); }); std::sort(textSegments.begin(), textSegments.end(), [](const TextInfo& left, const TextInfo& right) { return (left.textSize > right.textSize); }); for (std::vector<TextInfo>::iterator it = textSegments.begin(); it != textSegments.end(); ++it) { printf(" 0x%08llX %s\n", it->textSize, it->path); } break; } case modeNone: case modeInfo: case modeSlideInfo: case modeVerboseSlideInfo: case modeAcceleratorInfo: case modeTextInfo: case modeLocalSymbols: case modeJSONMap: case modeJSONDependents: case modeSectionSizes: case modeStrings: case modeObjCProtocols: case modeObjCClasses: case modeObjCSelectors: case modeExtract: break; } } return 0; } |