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1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 | /* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- * * Copyright (c) 2014 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 <unistd.h> #include <dirent.h> #include <sys/errno.h> #include <sys/fcntl.h> #include <sys/param.h> #include <mach/mach.h> #include <mach/mach_time.h> #include <mach-o/loader.h> #include <mach-o/fat.h> #include <mach/shared_region.h> #include <assert.h> #include <CommonCrypto/CommonHMAC.h> #include <CommonCrypto/CommonDigest.h> #include <CommonCrypto/CommonDigestSPI.h> #include <pthread/pthread.h> #include <string> #include <vector> #include <unordered_map> #include <unordered_set> #include "MachOParser.h" #include "CodeSigningTypes.h" #include "DyldSharedCache.h" #include "CacheBuilder.h" #include "FileAbstraction.hpp" #include "LaunchCacheWriter.h" #include "Trie.hpp" #include "Diagnostics.h" #include "ImageProxy.h" #if __has_include("dyld_cache_config.h") #include "dyld_cache_config.h" #else #define ARM_SHARED_REGION_START 0x1A000000ULL #define ARM_SHARED_REGION_SIZE 0x26000000ULL #define ARM64_SHARED_REGION_START 0x180000000ULL #define ARM64_SHARED_REGION_SIZE 0x40000000ULL #endif const CacheBuilder::ArchLayout CacheBuilder::_s_archLayout[] = { { 0x7FFF20000000ULL, 0xEFE00000ULL, 0x40000000, 0xFFFF000000000000, "x86_64", 0, 0, 0, 12, true, true }, { 0x7FFF20000000ULL, 0xEFE00000ULL, 0x40000000, 0xFFFF000000000000, "x86_64h", 0, 0, 0, 12, true, true }, { SHARED_REGION_BASE_I386, SHARED_REGION_SIZE_I386, 0x00200000, 0x0, "i386", 0, 0, 0, 12, false, false }, { ARM64_SHARED_REGION_START, ARM64_SHARED_REGION_SIZE, 0x02000000, 0x00FFFF0000000000, "arm64", 0x0000C000, 0x00100000, 0x07F00000, 14, false, true }, { ARM64_SHARED_REGION_START, ARM64_SHARED_REGION_SIZE, 0x02000000, 0x00FFFF0000000000, "arm64e", 0x0000C000, 0x00100000, 0x07F00000, 14, false, true }, { ARM_SHARED_REGION_START, ARM_SHARED_REGION_SIZE, 0x02000000, 0xE0000000, "armv7s", 0, 0, 0, 14, false, false }, { ARM_SHARED_REGION_START, ARM_SHARED_REGION_SIZE, 0x00400000, 0xE0000000, "armv7k", 0, 0, 0, 14, false, false }, { 0x40000000, 0x40000000, 0x02000000, 0x0, "sim-x86", 0, 0, 0, 14, false, false } }; // These are dylibs that may be interposed, so stubs calling into them should never be bypassed const char* const CacheBuilder::_s_neverStubEliminate[] = { "/usr/lib/system/libdispatch.dylib", nullptr }; CacheBuilder::CacheBuilder(const DyldSharedCache::CreateOptions& options) : _options(options) , _buffer(nullptr) , _diagnostics(options.loggingPrefix, options.verbose) , _archLayout(nullptr) , _aliasCount(0) , _slideInfoFileOffset(0) , _slideInfoBufferSizeAllocated(0) , _allocatedBufferSize(0) , _currentFileSize(0) , _vmSize(0) , _branchPoolsLinkEditStartAddr(0) { std::string targetArch = options.archName; if ( options.forSimulator && (options.archName == "i386") ) targetArch = "sim-x86"; for (const ArchLayout& layout : _s_archLayout) { if ( layout.archName == targetArch ) { _archLayout = &layout; break; } } } std::string CacheBuilder::errorMessage() { return _diagnostics.errorMessage(); } const std::set<std::string> CacheBuilder::warnings() { return _diagnostics.warnings(); } void CacheBuilder::deleteBuffer() { vm_deallocate(mach_task_self(), (vm_address_t)_buffer, _allocatedBufferSize); _buffer = nullptr; _allocatedBufferSize = 0; } std::vector<DyldSharedCache::MappedMachO> CacheBuilder::makeSortedDylibs(const std::vector<DyldSharedCache::MappedMachO>& dylibs, const std::unordered_map<std::string, unsigned> sortOrder) { std::vector<DyldSharedCache::MappedMachO> sortedDylibs = dylibs; std::sort(sortedDylibs.begin(), sortedDylibs.end(), [&](const DyldSharedCache::MappedMachO& a, const DyldSharedCache::MappedMachO& b) { const auto& orderA = sortOrder.find(a.runtimePath); const auto& orderB = sortOrder.find(b.runtimePath); bool foundA = (orderA != sortOrder.end()); bool foundB = (orderB != sortOrder.end()); // Order all __DATA_DIRTY segments specified in the order file first, in // the order specified in the file, followed by any other __DATA_DIRTY // segments in lexicographic order. if ( foundA && foundB ) return orderA->second < orderB->second; else if ( foundA ) return true; else if ( foundB ) return false; else return a.runtimePath < b.runtimePath; }); return sortedDylibs; } inline uint32_t absolutetime_to_milliseconds(uint64_t abstime) { return (uint32_t)(abstime/1000/1000); } struct DylibAndSize { const char* installName; uint64_t size; }; bool CacheBuilder::cacheOverflow(const dyld_cache_mapping_info regions[3]) { if ( _archLayout->sharedRegionsAreDiscontiguous ) { // for macOS x86_64 cache, need to check each region for overflow return ( (regions[0].size > 0x60000000) || (regions[1].size > 0x40000000) || (regions[2].size > 0x3FE00000) ); } else { return (_vmSize > _archLayout->sharedMemorySize); } } bool CacheBuilder::build(const std::vector<DyldSharedCache::MappedMachO>& dylibs, const std::vector<DyldSharedCache::MappedMachO>& otherOsDylibsInput, const std::vector<DyldSharedCache::MappedMachO>& osExecutables) { // <rdar://problem/21317611> error out instead of crash if cache has no dylibs // FIXME: plist should specify required vs optional dylibs if ( dylibs.size() < 30 ) { _diagnostics.error("missing required minimum set of dylibs"); return false; } uint64_t t1 = mach_absolute_time(); // make copy of dylib list and sort std::vector<DyldSharedCache::MappedMachO> sortedDylibs = makeSortedDylibs(dylibs, _options.dylibOrdering); std::vector<DyldSharedCache::MappedMachO> otherOsDylibs = otherOsDylibsInput; // assign addresses for each segment of each dylib in new cache dyld_cache_mapping_info regions[3]; SegmentMapping segmentMapping = assignSegmentAddresses(sortedDylibs, regions); if ( cacheOverflow(regions) ) { if ( !_options.evictLeafDylibsOnOverflow ) { _diagnostics.error("cache overflow: %lluMB (max %lluMB)", _vmSize / 1024 / 1024, (_archLayout->sharedMemorySize) / 1024 / 1024); return false; } // find all leaf (not referenced by anything else in cache) dylibs // build count of how many references there are to each dylib __block std::map<std::string, unsigned int> referenceCount; for (const DyldSharedCache::MappedMachO& dylib : sortedDylibs) { dyld3::MachOParser parser(dylib.mh); parser.forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool &stop) { referenceCount[loadPath] += 1; }); } // find all dylibs not referenced std::vector<DylibAndSize> unreferencedDylibs; for (const DyldSharedCache::MappedMachO& dylib : sortedDylibs) { dyld3::MachOParser parser(dylib.mh); const char* installName = parser.installName(); if ( referenceCount.count(installName) == 0 ) { // conservative: sum up all segments except LINKEDIT __block uint64_t segsSize = 0; parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, bool &stop) { if ( strcmp(segName, "__LINKEDIT") != 0 ) segsSize += vmSize; }); unreferencedDylibs.push_back({installName, segsSize}); } } // sort leaf dylibs by size std::sort(unreferencedDylibs.begin(), unreferencedDylibs.end(), [&](const DylibAndSize& a, const DylibAndSize& b) { return ( a.size > b.size ); }); // build set of dylibs that if removed will allow cache to build uint64_t reductionTarget = _vmSize - _archLayout->sharedMemorySize; std::set<std::string> toRemove; for (DylibAndSize& dylib : unreferencedDylibs) { if ( _options.verbose ) _diagnostics.warning("to prevent cache overflow, not caching %s", dylib.installName); toRemove.insert(dylib.installName); if ( dylib.size > reductionTarget ) break; reductionTarget -= dylib.size; } // transfer overflow dylibs from cached vector to other vector for (const std::string& installName : toRemove) { for (std::vector<DyldSharedCache::MappedMachO>::iterator it=sortedDylibs.begin(); it != sortedDylibs.end(); ++it) { dyld3::MachOParser parser(it->mh); if ( installName == parser.installName() ) { otherOsDylibs.push_back(*it); sortedDylibs.erase(it); break; } } } // re-layout cache segmentMapping = assignSegmentAddresses(sortedDylibs, regions); if ( cacheOverflow(regions) ) { _diagnostics.error("cache overflow, tried evicting %ld leaf daylibs, but still too big: %lluMB (max %lluMB)", toRemove.size(), _vmSize / 1024 / 1024, (_archLayout->sharedMemorySize) / 1024 / 1024); return false; } } // allocate buffer for new cache _allocatedBufferSize = std::max(_currentFileSize, (uint64_t)0x100000)*1.1; // add 10% to allocation to support large closures if ( vm_allocate(mach_task_self(), (vm_address_t*)&_buffer, _allocatedBufferSize, VM_FLAGS_ANYWHERE) != 0 ) { _diagnostics.error("could not allocate buffer"); return false; } _currentFileSize = _allocatedBufferSize; // write unoptimized cache writeCacheHeader(regions, sortedDylibs, segmentMapping); copyRawSegments(sortedDylibs, segmentMapping); adjustAllImagesForNewSegmentLocations(sortedDylibs, segmentMapping); if ( _diagnostics.hasError() ) return false; bindAllImagesInCacheFile(regions); if ( _diagnostics.hasError() ) return false; // optimize ObjC if ( _options.optimizeObjC ) optimizeObjC(_buffer, _archLayout->is64, _options.optimizeStubs, _pointersForASLR, _diagnostics); if ( _diagnostics.hasError() ) return false; // optimize away stubs std::vector<uint64_t> branchPoolOffsets; uint64_t cacheStartAddress = _archLayout->sharedMemoryStart; if ( _options.optimizeStubs ) { std::vector<uint64_t> branchPoolStartAddrs; const uint64_t* p = (uint64_t*)((uint8_t*)_buffer + _buffer->header.branchPoolsOffset); for (int i=0; i < _buffer->header.branchPoolsCount; ++i) { uint64_t poolAddr = p[i]; branchPoolStartAddrs.push_back(poolAddr); branchPoolOffsets.push_back(poolAddr - cacheStartAddress); } bypassStubs(_buffer, branchPoolStartAddrs, _s_neverStubEliminate, _diagnostics); } uint64_t t2 = mach_absolute_time(); // FIPS seal corecrypto, This must be done after stub elimination (so that // __TEXT,__text is not changed after sealing), but before LINKEDIT // optimization (so that we still have access to local symbols) fipsSign(); // merge and compact LINKEDIT segments dyld_cache_local_symbols_info* localsInfo = nullptr; if ( dylibs.size() == 0 ) _currentFileSize = 0x1000; else _currentFileSize = optimizeLinkedit(_buffer, _archLayout->is64, _options.excludeLocalSymbols, _options.optimizeStubs, branchPoolOffsets, _diagnostics, &localsInfo); uint64_t t3 = mach_absolute_time(); // add ImageGroup for all dylibs in cache __block std::vector<DyldSharedCache::MappedMachO> cachedDylibs; std::unordered_map<std::string, const DyldSharedCache::MappedMachO*> mapIntoSortedDylibs; for (const DyldSharedCache::MappedMachO& entry : sortedDylibs) { mapIntoSortedDylibs[entry.runtimePath] = &entry; } _buffer->forEachImage(^(const mach_header* mh, const char* installName) { auto pos = mapIntoSortedDylibs.find(installName); if ( pos != mapIntoSortedDylibs.end() ) { DyldSharedCache::MappedMachO newEntry = *(pos->second); newEntry.mh = mh; cachedDylibs.push_back(newEntry); } else { bool found = false; for (const std::string& prefix : _options.pathPrefixes) { std::string fullPath = prefix + installName; char resolvedPath[PATH_MAX]; if ( realpath(fullPath.c_str(), resolvedPath) != nullptr ) { std::string resolvedUnPrefixed = &resolvedPath[prefix.size()]; pos = mapIntoSortedDylibs.find(resolvedUnPrefixed); if ( pos != mapIntoSortedDylibs.end() ) { DyldSharedCache::MappedMachO newEntry = *(pos->second); newEntry.mh = mh; cachedDylibs.push_back(newEntry); found = true; } } } if ( !found ) fprintf(stderr, "missing mapping for %s\n", installName); } }); dyld3::DyldCacheParser dyldCacheParser(_buffer, true); dyld3::ImageProxyGroup* dylibGroup = dyld3::ImageProxyGroup::makeDyldCacheDylibsGroup(_diagnostics, dyldCacheParser, cachedDylibs, _options.pathPrefixes, _patchTable, _options.optimizeStubs, !_options.dylibsRemovedDuringMastering); if ( _diagnostics.hasError() ) return false; addCachedDylibsImageGroup(dylibGroup); if ( _diagnostics.hasError() ) return false; uint64_t t4 = mach_absolute_time(); // add ImageGroup for other OS dylibs and bundles dyld3::ImageProxyGroup* otherGroup = dyld3::ImageProxyGroup::makeOtherOsGroup(_diagnostics, dyldCacheParser, dylibGroup, otherOsDylibs, _options.inodesAreSameAsRuntime, _options.pathPrefixes); if ( _diagnostics.hasError() ) return false; addCachedOtherDylibsImageGroup(otherGroup); if ( _diagnostics.hasError() ) return false; uint64_t t5 = mach_absolute_time(); // compute and add launch closures std::map<std::string, const dyld3::launch_cache::binary_format::Closure*> closures; for (const DyldSharedCache::MappedMachO& mainProg : osExecutables) { Diagnostics clsDiag; const dyld3::launch_cache::binary_format::Closure* cls = dyld3::ImageProxyGroup::makeClosure(clsDiag, dyldCacheParser, dylibGroup, otherGroup, mainProg, _options.inodesAreSameAsRuntime, _options.pathPrefixes); if ( clsDiag.hasError() ) { // if closure cannot be built, silently skip it, unless in verbose mode if ( _options.verbose ) { _diagnostics.warning("building closure for '%s': %s", mainProg.runtimePath.c_str(), clsDiag.errorMessage().c_str()); for (const std::string& warn : clsDiag.warnings() ) _diagnostics.warning("%s", warn.c_str()); } } else { closures[mainProg.runtimePath] = cls; } } addClosures(closures); if ( _diagnostics.hasError() ) return false; uint64_t t6 = mach_absolute_time(); // fill in slide info at start of region[2] // do this last because it modifies pointers in DATA segments if ( _options.cacheSupportsASLR ) { if ( _archLayout->is64 ) writeSlideInfoV2<Pointer64<LittleEndian>>(); else writeSlideInfoV2<Pointer32<LittleEndian>>(); } uint64_t t7 = mach_absolute_time(); // update last region size dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)_buffer + _buffer->header.mappingOffset); _currentFileSize = align(_currentFileSize, _archLayout->sharedRegionAlignP2); mappings[2].size = _currentFileSize - mappings[2].fileOffset; // record cache bounds _buffer->header.sharedRegionStart = _archLayout->sharedMemoryStart; _buffer->header.sharedRegionSize = _archLayout->sharedMemorySize; if ( _archLayout->sharedRegionsAreDiscontiguous ) { // special case x86_64 which has three non-contiguous chunks each in their own 1GB regions uint64_t maxSlide0 = 0x60000000 - mappings[0].size; // TEXT region has 1.5GB region uint64_t maxSlide1 = 0x40000000 - mappings[1].size; uint64_t maxSlide2 = 0x3FE00000 - mappings[2].size; _buffer->header.maxSlide = std::min(std::min(maxSlide0, maxSlide1), maxSlide2); } else { _buffer->header.maxSlide = (_archLayout->sharedMemoryStart + _archLayout->sharedMemorySize) - (mappings[2].address + mappings[2].size); } // append "unmapped" local symbols region if ( _options.excludeLocalSymbols ) { size_t localsInfoSize = align(localsInfo->stringsOffset + localsInfo->stringsSize, _archLayout->sharedRegionAlignP2); if ( _currentFileSize + localsInfoSize > _allocatedBufferSize ) { _diagnostics.warning("local symbols omitted because cache buffer overflow"); } else { memcpy((char*)_buffer+_currentFileSize, localsInfo, localsInfoSize); _buffer->header.localSymbolsOffset = _currentFileSize; _buffer->header.localSymbolsSize = localsInfoSize; _currentFileSize += localsInfoSize; } free((void*)localsInfo); } recomputeCacheUUID(); // Calculate the VMSize of the resulting cache __block uint64_t endAddr = 0; _buffer->forEachRegion(^(const void* content, uint64_t vmAddr, uint64_t size, uint32_t permissions) { if (vmAddr+size > endAddr) endAddr = vmAddr+size; }); _vmSize = endAddr - cacheStartAddress; // last sanity check on size if ( _vmSize > _archLayout->sharedMemorySize ) { _diagnostics.error("cache overflow after optimizations. %lluMB (max %lluMB)", _vmSize / 1024 / 1024, (_archLayout->sharedMemorySize) / 1024 / 1024); return true; } // codesignature is part of file, but is not mapped codeSign(); if ( _diagnostics.hasError() ) return false; uint64_t t8 = mach_absolute_time(); if ( _options.verbose ) { fprintf(stderr, "time to copy and bind cached dylibs: %ums\n", absolutetime_to_milliseconds(t2-t1)); fprintf(stderr, "time to optimize LINKEDITs: %ums\n", absolutetime_to_milliseconds(t3-t2)); fprintf(stderr, "time to build ImageGroup of %lu cached dylibs: %ums\n", sortedDylibs.size(), absolutetime_to_milliseconds(t4-t3)); fprintf(stderr, "time to build ImageGroup of %lu other dylibs: %ums\n", otherOsDylibs.size(), absolutetime_to_milliseconds(t5-t4)); fprintf(stderr, "time to build %lu closures: %ums\n", osExecutables.size(), absolutetime_to_milliseconds(t6-t5)); fprintf(stderr, "time to compute slide info: %ums\n", absolutetime_to_milliseconds(t7-t6)); fprintf(stderr, "time to compute UUID and codesign cache file: %ums\n", absolutetime_to_milliseconds(t8-t7)); } // trim over allocated buffer if ( _allocatedBufferSize > _currentFileSize ) { uint8_t* startOfUnused = (uint8_t*)_buffer+_currentFileSize; size_t unusedLen = _allocatedBufferSize-_currentFileSize; vm_deallocate(mach_task_self(), (vm_address_t)startOfUnused, unusedLen); _allocatedBufferSize = _currentFileSize; } return false; } void CacheBuilder::writeCacheHeader(const dyld_cache_mapping_info regions[3], const std::vector<DyldSharedCache::MappedMachO>& dylibs, const SegmentMapping& segmentMappings) { // "dyld_v1" + spaces + archName(), with enough spaces to pad to 15 bytes std::string magic = "dyld_v1"; magic.append(15 - magic.length() - _options.archName.length(), ' '); magic.append(_options.archName); assert(magic.length() == 15); // fill in header memcpy(_buffer->header.magic, magic.c_str(), 16); _buffer->header.mappingOffset = sizeof(dyld_cache_header); _buffer->header.mappingCount = 3; _buffer->header.imagesOffset = (uint32_t)(_buffer->header.mappingOffset + 3*sizeof(dyld_cache_mapping_info) + sizeof(uint64_t)*_branchPoolStarts.size()); _buffer->header.imagesCount = (uint32_t)dylibs.size() + _aliasCount; _buffer->header.dyldBaseAddress = 0; _buffer->header.codeSignatureOffset= 0; _buffer->header.codeSignatureSize = 0; _buffer->header.slideInfoOffset = _slideInfoFileOffset; _buffer->header.slideInfoSize = _slideInfoBufferSizeAllocated; _buffer->header.localSymbolsOffset = 0; _buffer->header.localSymbolsSize = 0; _buffer->header.cacheType = _options.optimizeStubs ? kDyldSharedCacheTypeProduction : kDyldSharedCacheTypeDevelopment; _buffer->header.accelerateInfoAddr = 0; _buffer->header.accelerateInfoSize = 0; bzero(_buffer->header.uuid, 16); // overwritten later by recomputeCacheUUID() _buffer->header.branchPoolsOffset = _buffer->header.mappingOffset + 3*sizeof(dyld_cache_mapping_info); _buffer->header.branchPoolsCount = (uint32_t)_branchPoolStarts.size(); _buffer->header.imagesTextOffset = _buffer->header.imagesOffset + sizeof(dyld_cache_image_info)*_buffer->header.imagesCount; _buffer->header.imagesTextCount = dylibs.size(); _buffer->header.platform = (uint8_t)_options.platform; _buffer->header.formatVersion = dyld3::launch_cache::binary_format::kFormatVersion; _buffer->header.dylibsExpectedOnDisk = !_options.dylibsRemovedDuringMastering; _buffer->header.simulator = _options.forSimulator; // fill in mappings dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)_buffer + _buffer->header.mappingOffset); mappings[0] = regions[0]; mappings[1] = regions[1]; mappings[2] = regions[2]; // fill in branch pool addresses uint64_t* p = (uint64_t*)((char*)_buffer + _buffer->header.branchPoolsOffset); for (uint64_t pool : _branchPoolStarts) { *p++ = pool; } // fill in image table dyld_cache_image_info* images = (dyld_cache_image_info*)((char*)_buffer + _buffer->header.imagesOffset); for (const DyldSharedCache::MappedMachO& dylib : dylibs) { const std::vector<SegmentMappingInfo>& segs = segmentMappings.at(dylib.mh); dyld3::MachOParser parser(dylib.mh); const char* installName = parser.installName(); images->address = segs[0].dstCacheAddress; if ( _options.dylibsRemovedDuringMastering ) { images->modTime = 0; images->inode = pathHash(installName); } else { images->modTime = dylib.modTime; images->inode = dylib.inode; } uint32_t installNameOffsetInTEXT = (uint32_t)(installName - (char*)dylib.mh); images->pathFileOffset = (uint32_t)segs[0].dstCacheOffset + installNameOffsetInTEXT; ++images; } // append aliases image records and strings /* for (auto &dylib : _dylibs) { if (!dylib->installNameAliases.empty()) { for (const std::string& alias : dylib->installNameAliases) { images->set_address(_segmentMap[dylib][0].address); if (_manifest.platform() == "osx") { images->modTime = dylib->lastModTime; images->inode = dylib->inode; } else { images->modTime = 0; images->inode = pathHash(alias.c_str()); } images->pathFileOffset = offset; //fprintf(stderr, "adding alias %s for %s\n", alias.c_str(), dylib->installName.c_str()); ::strcpy((char*)&_buffer[offset], alias.c_str()); offset += alias.size() + 1; ++images; } } } */ // calculate start of text image array and trailing string pool dyld_cache_image_text_info* textImages = (dyld_cache_image_text_info*)((char*)_buffer + _buffer->header.imagesTextOffset); uint32_t stringOffset = (uint32_t)(_buffer->header.imagesTextOffset + sizeof(dyld_cache_image_text_info) * dylibs.size()); // write text image array and image names pool at same time for (const DyldSharedCache::MappedMachO& dylib : dylibs) { const std::vector<SegmentMappingInfo>& segs = segmentMappings.at(dylib.mh); dyld3::MachOParser parser(dylib.mh); parser.getUuid(textImages->uuid); textImages->loadAddress = segs[0].dstCacheAddress; textImages->textSegmentSize = (uint32_t)segs[0].dstCacheSegmentSize; textImages->pathOffset = stringOffset; const char* installName = parser.installName(); ::strcpy((char*)_buffer + stringOffset, installName); stringOffset += (uint32_t)strlen(installName)+1; ++textImages; } // make sure header did not overflow into first mapped image const dyld_cache_image_info* firstImage = (dyld_cache_image_info*)((char*)_buffer + _buffer->header.imagesOffset); assert(stringOffset <= (firstImage->address - mappings[0].address)); } void CacheBuilder::copyRawSegments(const std::vector<DyldSharedCache::MappedMachO>& dylibs, const SegmentMapping& mapping) { uint8_t* cacheBytes = (uint8_t*)_buffer; for (const DyldSharedCache::MappedMachO& dylib : dylibs) { auto pos = mapping.find(dylib.mh); assert(pos != mapping.end()); for (const SegmentMappingInfo& info : pos->second) { //fprintf(stderr, "copy %s segment %s (0x%08X bytes) from %p to %p (logical addr 0x%llX) for %s\n", _options.archName.c_str(), info.segName, info.copySegmentSize, info.srcSegment, &cacheBytes[info.dstCacheOffset], info.dstCacheAddress, dylib.runtimePath.c_str()); ::memcpy(&cacheBytes[info.dstCacheOffset], info.srcSegment, info.copySegmentSize); } } } void CacheBuilder::adjustAllImagesForNewSegmentLocations(const std::vector<DyldSharedCache::MappedMachO>& dylibs, const SegmentMapping& mapping) { uint8_t* cacheBytes = (uint8_t*)_buffer; for (const DyldSharedCache::MappedMachO& dylib : dylibs) { auto pos = mapping.find(dylib.mh); assert(pos != mapping.end()); mach_header* mhInCache = (mach_header*)&cacheBytes[pos->second[0].dstCacheOffset]; adjustDylibSegments(_buffer, _archLayout->is64, mhInCache, pos->second, _pointersForASLR, _diagnostics); if ( _diagnostics.hasError() ) break; } } struct Counts { unsigned long lazyCount = 0; unsigned long nonLazyCount = 0; }; void CacheBuilder::bindAllImagesInCacheFile(const dyld_cache_mapping_info regions[3]) { const bool log = false; __block std::unordered_map<std::string, Counts> useCounts; // build map of install names to mach_headers __block std::unordered_map<std::string, const mach_header*> installNameToMH; __block std::vector<const mach_header*> dylibMHs; _buffer->forEachImage(^(const mach_header* mh, const char* installName) { installNameToMH[installName] = mh; dylibMHs.push_back(mh); }); __block Diagnostics parsingDiag; bool (^dylibFinder)(uint32_t, const char*, void* , const mach_header**, void**) = ^(uint32_t depIndex, const char* depLoadPath, void* extra, const mach_header** foundMH, void** foundExtra) { auto pos = installNameToMH.find(depLoadPath); if ( pos != installNameToMH.end() ) { *foundMH = pos->second; *foundExtra = nullptr; return true; } parsingDiag.error("dependent dylib %s not found", depLoadPath); return false; }; if ( parsingDiag.hasError() ) { _diagnostics.error("%s", parsingDiag.errorMessage().c_str()); return; } // bind every dylib in cache for (const mach_header* mh : dylibMHs) { dyld3::MachOParser parser(mh, true); bool is64 = parser.is64(); const char* depPaths[256]; const char** depPathsArray = depPaths; __block int depIndex = 1; parser.forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) { depPathsArray[depIndex++] = loadPath; }); uint8_t* segCacheStarts[10]; uint64_t segCacheAddrs[10]; uint8_t** segCacheStartsArray = segCacheStarts; uint64_t* segCacheAddrsArray = segCacheAddrs; __block int segIndex = 0; parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, bool& stop) { segCacheStartsArray[segIndex] = (segIndex == 0) ? (uint8_t*)mh : (uint8_t*)_buffer + fileOffset; segCacheAddrsArray[segIndex] = vmAddr; ++segIndex; }); __block Diagnostics bindingDiag; parser.forEachBind(bindingDiag, ^(uint32_t dataSegIndex, uint64_t dataSegOffset, uint8_t type, int libOrdinal, uint64_t addend, const char* symbolName, bool weakImport, bool lazy, bool& stop) { if ( log ) { if ( lazy ) useCounts[symbolName].lazyCount += 1; else useCounts[symbolName].nonLazyCount += 1; } const mach_header* targetMH = nullptr; if ( libOrdinal == BIND_SPECIAL_DYLIB_SELF ) { targetMH = mh; } else if ( libOrdinal == BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE ) { parsingDiag.error("bind ordinal BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE not supported in dylibs in dyld shared cache (found in %s)", parser.installName()); stop = true; return; } else if ( libOrdinal == BIND_SPECIAL_DYLIB_FLAT_LOOKUP ) { parsingDiag.error("bind ordinal BIND_SPECIAL_DYLIB_FLAT_LOOKUP not supported in dylibs in dyld shared cache (found in %s)", parser.installName()); stop = true; return; } else { const char* fromPath = depPathsArray[libOrdinal]; auto pos = installNameToMH.find(fromPath); if (pos == installNameToMH.end()) { if (!weakImport) { _diagnostics.error("dependent dylib %s not found", fromPath); } return; } targetMH = pos->second; } dyld3::MachOParser targetParser(targetMH, true); dyld3::MachOParser::FoundSymbol foundInfo; uint64_t targetValue = 0; uint8_t* fixupLoc = segCacheStartsArray[dataSegIndex] + dataSegOffset; if ( targetParser.findExportedSymbol(parsingDiag, symbolName, nullptr, foundInfo, dylibFinder) ) { const mach_header* foundInMH = foundInfo.foundInDylib; dyld3::MachOParser foundInParser(foundInMH, true); uint64_t foundInBaseAddress = foundInParser.preferredLoadAddress(); switch ( foundInfo.kind ) { case dyld3::MachOParser::FoundSymbol::Kind::resolverOffset: // Bind to the target stub for resolver based functions. // There may be a later optimization to alter the client // stubs to directly to the target stub's lazy pointer. case dyld3::MachOParser::FoundSymbol::Kind::headerOffset: targetValue = foundInBaseAddress + foundInfo.value + addend; _pointersForASLR.push_back((void*)fixupLoc); if ( foundInMH != mh ) { uint32_t mhVmOffset = (uint32_t)((uint8_t*)foundInMH - (uint8_t*)_buffer); uint32_t definitionCacheVmOffset = (uint32_t)(mhVmOffset + foundInfo.value); uint32_t referenceCacheDataVmOffset = (uint32_t)(segCacheAddrsArray[dataSegIndex] + dataSegOffset - regions[1].address); assert(referenceCacheDataVmOffset < (1<<30)); dyld3::launch_cache::binary_format::PatchOffset entry; entry.last = false; entry.hasAddend = (addend != 0); entry.dataRegionOffset = referenceCacheDataVmOffset; _patchTable[foundInMH][definitionCacheVmOffset].insert(*((uint32_t*)&entry)); } break; case dyld3::MachOParser::FoundSymbol::Kind::absolute: // pointers set to absolute values are not slid targetValue = foundInfo.value + addend; break; } } else if ( weakImport ) { // weak pointers set to zero are not slid targetValue = 0; } else { parsingDiag.error("cannot find symbol %s, needed in dylib %s", symbolName, parser.installName()); stop = true; } switch ( type ) { case BIND_TYPE_POINTER: if ( is64 ) *((uint64_t*)fixupLoc) = targetValue; else *((uint32_t*)fixupLoc) = (uint32_t)targetValue; break; case BIND_TYPE_TEXT_ABSOLUTE32: case BIND_TYPE_TEXT_PCREL32: parsingDiag.error("text relocs not supported for shared cache binding in %s", parser.installName()); stop = true; break; default: parsingDiag.error("bad bind type (%d) in %s", type, parser.installName()); stop = true; break; } }); if ( bindingDiag.hasError() ) { parsingDiag.error("%s in dylib %s", bindingDiag.errorMessage().c_str(), parser.installName()); } if ( parsingDiag.hasError() ) break; // also need to add patch locations for weak-binds that point within same image, since they are not captured by binds above parser.forEachWeakDef(bindingDiag, ^(bool strongDef, uint32_t dataSegIndex, uint64_t dataSegOffset, uint64_t addend, const char* symbolName, bool &stop) { if ( strongDef ) return; uint8_t* fixupLoc = segCacheStartsArray[dataSegIndex] + dataSegOffset; dyld3::MachOParser::FoundSymbol weakFoundInfo; Diagnostics weakLookupDiag; if ( parser.findExportedSymbol(weakLookupDiag, symbolName, nullptr, weakFoundInfo, nullptr) ) { // this is an interior pointing (rebased) pointer uint64_t targetValue; if ( is64 ) targetValue = *((uint64_t*)fixupLoc); else targetValue = *((uint32_t*)fixupLoc); uint32_t definitionCacheVmOffset = (uint32_t)(targetValue - regions[0].address); uint32_t referenceCacheDataVmOffset = (uint32_t)(segCacheAddrsArray[dataSegIndex] + dataSegOffset - regions[1].address); assert(referenceCacheDataVmOffset < (1<<30)); dyld3::launch_cache::binary_format::PatchOffset entry; entry.last = false; entry.hasAddend = (addend != 0); entry.dataRegionOffset = referenceCacheDataVmOffset; _patchTable[mh][definitionCacheVmOffset].insert(*((uint32_t*)&entry)); } }); if ( bindingDiag.hasError() ) { parsingDiag.error("%s in dylib %s", bindingDiag.errorMessage().c_str(), parser.installName()); } if ( parsingDiag.hasError() ) break; } if ( log ) { unsigned lazyCount = 0; unsigned nonLazyCount = 0; std::unordered_set<std::string> lazyTargets; for (auto entry : useCounts) { fprintf(stderr, "% 3ld % 3ld %s\n", entry.second.lazyCount, entry.second.nonLazyCount, entry.first.c_str()); lazyCount += entry.second.lazyCount; nonLazyCount += entry.second.nonLazyCount; if ( entry.second.lazyCount != 0 ) lazyTargets.insert(entry.first); } fprintf(stderr, "lazyCount = %d\n", lazyCount); fprintf(stderr, "nonLazyCount = %d\n", nonLazyCount); fprintf(stderr, "unique lazys = %ld\n", lazyTargets.size()); } if ( parsingDiag.hasError() ) _diagnostics.error("%s", parsingDiag.errorMessage().c_str()); } void CacheBuilder::recomputeCacheUUID(void) { // Clear existing UUID, then MD5 whole cache buffer. uint8_t* uuidLoc = _buffer->header.uuid; bzero(uuidLoc, 16); CC_MD5(_buffer, (unsigned)_currentFileSize, uuidLoc); // <rdar://problem/6723729> uuids should conform to RFC 4122 UUID version 4 & UUID version 5 formats uuidLoc[6] = ( uuidLoc[6] & 0x0F ) | ( 3 << 4 ); uuidLoc[8] = ( uuidLoc[8] & 0x3F ) | 0x80; } CacheBuilder::SegmentMapping CacheBuilder::assignSegmentAddresses(const std::vector<DyldSharedCache::MappedMachO>& dylibs, dyld_cache_mapping_info regions[3]) { // calculate size of header info and where first dylib's mach_header should start size_t startOffset = sizeof(dyld_cache_header) + 3*sizeof(dyld_cache_mapping_info); size_t maxPoolCount = 0; if ( _archLayout->branchReach != 0 ) maxPoolCount = (_archLayout->sharedMemorySize / _archLayout->branchReach); startOffset += maxPoolCount * sizeof(uint64_t); startOffset += sizeof(dyld_cache_image_info) * dylibs.size(); startOffset += sizeof(dyld_cache_image_text_info) * dylibs.size(); for (const DyldSharedCache::MappedMachO& dylib : dylibs) { dyld3::MachOParser parser(dylib.mh); startOffset += (strlen(parser.installName()) + 1); } //fprintf(stderr, "%s total header size = 0x%08lX\n", _options.archName.c_str(), startOffset); startOffset = align(startOffset, 12); _branchPoolStarts.clear(); __block uint64_t addr = _archLayout->sharedMemoryStart; __block SegmentMapping result; // assign TEXT segment addresses regions[0].address = addr; regions[0].fileOffset = 0; regions[0].initProt = VM_PROT_READ | VM_PROT_EXECUTE; regions[0].maxProt = VM_PROT_READ | VM_PROT_EXECUTE; addr += startOffset; // header __block uint64_t lastPoolAddress = addr; for (const DyldSharedCache::MappedMachO& dylib : dylibs) { dyld3::MachOParser parser(dylib.mh, true); parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, uint32_t segIndex, uint64_t sizeOfSections, uint8_t p2align, bool& stop) { if ( protections != (VM_PROT_READ | VM_PROT_EXECUTE) ) return; // Insert branch island pools every 128MB for arm64 if ( (_archLayout->branchPoolTextSize != 0) && ((addr + vmSize - lastPoolAddress) > _archLayout->branchReach) ) { _branchPoolStarts.push_back(addr); _diagnostics.verbose("adding branch pool at 0x%llX\n", addr); lastPoolAddress = addr; addr += _archLayout->branchPoolTextSize; } // Keep __TEXT segments 4K or more aligned addr = align(addr, std::max(p2align, (uint8_t)12)); SegmentMappingInfo info; info.srcSegment = (uint8_t*)dylib.mh + fileOffset; info.segName = segName; info.dstCacheAddress = addr; info.dstCacheOffset = (uint32_t)(addr - regions[0].address + regions[0].fileOffset); info.dstCacheSegmentSize = (uint32_t)align(sizeOfSections, 12); info.copySegmentSize = (uint32_t)align(sizeOfSections, 12); info.srcSegmentIndex = segIndex; result[dylib.mh].push_back(info); addr += info.dstCacheSegmentSize; }); } // align TEXT region end uint64_t endTextAddress = align(addr, _archLayout->sharedRegionAlignP2); regions[0].size = endTextAddress - regions[0].address; // assign __DATA* addresses if ( _archLayout->sharedRegionsAreDiscontiguous ) addr = _archLayout->sharedMemoryStart + 0x60000000; else addr = align((addr + _archLayout->sharedRegionPadding), _archLayout->sharedRegionAlignP2); regions[1].address = addr; regions[1].fileOffset = regions[0].fileOffset + regions[0].size; regions[1].initProt = VM_PROT_READ | VM_PROT_WRITE; regions[1].maxProt = VM_PROT_READ | VM_PROT_WRITE; // layout all __DATA_CONST segments __block int dataConstSegmentCount = 0; for (const DyldSharedCache::MappedMachO& dylib : dylibs) { dyld3::MachOParser parser(dylib.mh, true); parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, uint32_t segIndex, uint64_t sizeOfSections, uint8_t p2align, bool& stop) { if ( protections != (VM_PROT_READ | VM_PROT_WRITE) ) return; if ( strcmp(segName, "__DATA_CONST") != 0 ) return; ++dataConstSegmentCount; // Pack __DATA_CONST segments addr = align(addr, p2align); size_t copySize = std::min((size_t)fileSize, (size_t)sizeOfSections); SegmentMappingInfo info; info.srcSegment = (uint8_t*)dylib.mh + fileOffset; info.segName = segName; info.dstCacheAddress = addr; info.dstCacheOffset = (uint32_t)(addr - regions[1].address + regions[1].fileOffset); info.dstCacheSegmentSize = (uint32_t)sizeOfSections; info.copySegmentSize = (uint32_t)copySize; info.srcSegmentIndex = segIndex; result[dylib.mh].push_back(info); addr += info.dstCacheSegmentSize; }); } // layout all __DATA segments (and other r/w non-dirty, non-const) segments for (const DyldSharedCache::MappedMachO& dylib : dylibs) { dyld3::MachOParser parser(dylib.mh, true); parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, uint32_t segIndex, uint64_t sizeOfSections, uint8_t p2align, bool& stop) { if ( protections != (VM_PROT_READ | VM_PROT_WRITE) ) return; if ( strcmp(segName, "__DATA_CONST") == 0 ) return; if ( strcmp(segName, "__DATA_DIRTY") == 0 ) return; if ( dataConstSegmentCount > 10 ) { // Pack __DATA segments only if we also have __DATA_CONST segments addr = align(addr, p2align); } else { // Keep __DATA segments 4K or more aligned addr = align(addr, std::max(p2align, (uint8_t)12)); } size_t copySize = std::min((size_t)fileSize, (size_t)sizeOfSections); SegmentMappingInfo info; info.srcSegment = (uint8_t*)dylib.mh + fileOffset; info.segName = segName; info.dstCacheAddress = addr; info.dstCacheOffset = (uint32_t)(addr - regions[1].address + regions[1].fileOffset); info.dstCacheSegmentSize = (uint32_t)sizeOfSections; info.copySegmentSize = (uint32_t)copySize; info.srcSegmentIndex = segIndex; result[dylib.mh].push_back(info); addr += info.dstCacheSegmentSize; }); } // layout all __DATA_DIRTY segments, sorted addr = align(addr, 12); std::vector<DyldSharedCache::MappedMachO> dirtyDataDylibs = makeSortedDylibs(dylibs, _options.dirtyDataSegmentOrdering); for (const DyldSharedCache::MappedMachO& dylib : dirtyDataDylibs) { dyld3::MachOParser parser(dylib.mh, true); parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, uint32_t segIndex, uint64_t sizeOfSections, uint8_t p2align, bool& stop) { if ( protections != (VM_PROT_READ | VM_PROT_WRITE) ) return; if ( strcmp(segName, "__DATA_DIRTY") != 0 ) return; // Pack __DATA_DIRTY segments addr = align(addr, p2align); size_t copySize = std::min((size_t)fileSize, (size_t)sizeOfSections); SegmentMappingInfo info; info.srcSegment = (uint8_t*)dylib.mh + fileOffset; info.segName = segName; info.dstCacheAddress = addr; info.dstCacheOffset = (uint32_t)(addr - regions[1].address + regions[1].fileOffset); info.dstCacheSegmentSize = (uint32_t)sizeOfSections; info.copySegmentSize = (uint32_t)copySize; info.srcSegmentIndex = segIndex; result[dylib.mh].push_back(info); addr += info.dstCacheSegmentSize; }); } // align DATA region end uint64_t endDataAddress = align(addr, _archLayout->sharedRegionAlignP2); regions[1].size = endDataAddress - regions[1].address; // start read-only region if ( _archLayout->sharedRegionsAreDiscontiguous ) addr = _archLayout->sharedMemoryStart + 0xA0000000; else addr = align((addr + _archLayout->sharedRegionPadding), _archLayout->sharedRegionAlignP2); regions[2].address = addr; regions[2].fileOffset = regions[1].fileOffset + regions[1].size; regions[2].maxProt = VM_PROT_READ; regions[2].initProt = VM_PROT_READ; // reserve space for kernel ASLR slide info at start of r/o region if ( _options.cacheSupportsASLR ) { _slideInfoBufferSizeAllocated = align((regions[1].size/4096) * 4, _archLayout->sharedRegionAlignP2); // only need 2 bytes per page _slideInfoFileOffset = regions[2].fileOffset; addr += _slideInfoBufferSizeAllocated; } // layout all read-only (but not LINKEDIT) segments for (const DyldSharedCache::MappedMachO& dylib : dylibs) { dyld3::MachOParser parser(dylib.mh, true); parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, uint32_t segIndex, uint64_t sizeOfSections, uint8_t p2align, bool& stop) { if ( protections != VM_PROT_READ ) return; if ( strcmp(segName, "__LINKEDIT") == 0 ) return; // Keep segments segments 4K or more aligned addr = align(addr, std::max(p2align, (uint8_t)12)); SegmentMappingInfo info; info.srcSegment = (uint8_t*)dylib.mh + fileOffset; info.segName = segName; info.dstCacheAddress = addr; info.dstCacheOffset = (uint32_t)(addr - regions[2].address + regions[2].fileOffset); info.dstCacheSegmentSize = (uint32_t)align(sizeOfSections, 12); info.copySegmentSize = (uint32_t)sizeOfSections; info.srcSegmentIndex = segIndex; result[dylib.mh].push_back(info); addr += info.dstCacheSegmentSize; }); } // layout all LINKEDIT segments (after other read-only segments) for (const DyldSharedCache::MappedMachO& dylib : dylibs) { dyld3::MachOParser parser(dylib.mh, true); parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, uint32_t segIndex, uint64_t sizeOfSections, uint8_t p2align, bool& stop) { if ( protections != VM_PROT_READ ) return; if ( strcmp(segName, "__LINKEDIT") != 0 ) return; // Keep segments segments 4K or more aligned addr = align(addr, std::max(p2align, (uint8_t)12)); SegmentMappingInfo info; info.srcSegment = (uint8_t*)dylib.mh + fileOffset; info.segName = segName; info.dstCacheAddress = addr; info.dstCacheOffset = (uint32_t)(addr - regions[2].address + regions[2].fileOffset); info.dstCacheSegmentSize = (uint32_t)align(sizeOfSections, 12); info.copySegmentSize = (uint32_t)align(fileSize, 12); info.srcSegmentIndex = segIndex; result[dylib.mh].push_back(info); addr += info.dstCacheSegmentSize; }); } // add room for branch pool linkedits _branchPoolsLinkEditStartAddr = addr; addr += (_branchPoolStarts.size() * _archLayout->branchPoolLinkEditSize); // align r/o region end uint64_t endReadOnlyAddress = align(addr, _archLayout->sharedRegionAlignP2); regions[2].size = endReadOnlyAddress - regions[2].address; _currentFileSize = regions[2].fileOffset + regions[2].size; // FIXME: Confirm these numbers for all platform/arch combos // assume LINKEDIT optimzation reduces LINKEDITs to %40 of original size if ( _options.excludeLocalSymbols ) { _vmSize = regions[2].address + (regions[2].size * 2 / 5) - regions[0].address; } else { _vmSize = regions[2].address + (regions[2].size * 9 / 10) - regions[0].address; } // sort SegmentMappingInfo for each image to be in the same order as original segments for (auto& entry : result) { std::vector<SegmentMappingInfo>& infos = entry.second; std::sort(infos.begin(), infos.end(), [&](const SegmentMappingInfo& a, const SegmentMappingInfo& b) { return a.srcSegmentIndex < b.srcSegmentIndex; }); } return result; } uint64_t CacheBuilder::pathHash(const char* path) { uint64_t sum = 0; for (const char* s=path; *s != '\0'; ++s) sum += sum*4 + *s; return sum; } void CacheBuilder::findDylibAndSegment(const void* contentPtr, std::string& foundDylibName, std::string& foundSegName) { foundDylibName = "???"; foundSegName = "???"; uint32_t cacheOffset = (uint32_t)((uint8_t*)contentPtr - (uint8_t*)_buffer); _buffer->forEachImage(^(const mach_header* mh, const char* installName) { dyld3::MachOParser parser(mh, true); parser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, bool& stop) { if ( (cacheOffset > fileOffset) && (cacheOffset < (fileOffset+vmSize)) ) { foundDylibName = installName; foundSegName = segName; } }); }); } template <typename P> bool CacheBuilder::makeRebaseChain(uint8_t* pageContent, uint16_t lastLocationOffset, uint16_t offset, const dyld_cache_slide_info2* info) { typedef typename P::uint_t pint_t; const pint_t deltaMask = (pint_t)(info->delta_mask); const pint_t valueMask = ~deltaMask; const pint_t valueAdd = (pint_t)(info->value_add); const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2; const uint32_t maxDelta = (uint32_t)(deltaMask >> deltaShift); pint_t* lastLoc = (pint_t*)&pageContent[lastLocationOffset+0]; pint_t lastValue = (pint_t)P::getP(*lastLoc); if ( (lastValue - valueAdd) & deltaMask ) { std::string dylibName; std::string segName; findDylibAndSegment((void*)pageContent, dylibName, segName); _diagnostics.error("rebase pointer does not point within cache. lastOffset=0x%04X, seg=%s, dylib=%s\n", lastLocationOffset, segName.c_str(), dylibName.c_str()); return false; } if ( offset <= (lastLocationOffset+maxDelta) ) { // previous location in range, make link from it // encode this location into last value pint_t delta = offset - lastLocationOffset; pint_t newLastValue = ((lastValue - valueAdd) & valueMask) | (delta << deltaShift); //warning(" add chain: delta = %d, lastOffset=0x%03X, offset=0x%03X, org value=0x%08lX, new value=0x%08lX", // offset - lastLocationOffset, lastLocationOffset, offset, (long)lastValue, (long)newLastValue); P::setP(*lastLoc, newLastValue); return true; } //warning(" too big delta = %d, lastOffset=0x%03X, offset=0x%03X", offset - lastLocationOffset, lastLocationOffset, offset); // distance between rebase locations is too far // see if we can make a chain from non-rebase locations uint16_t nonRebaseLocationOffsets[1024]; unsigned nrIndex = 0; for (uint16_t i = lastLocationOffset; i < offset-maxDelta; ) { nonRebaseLocationOffsets[nrIndex] = 0; for (int j=maxDelta; j > 0; j -= 4) { pint_t value = (pint_t)P::getP(*(pint_t*)&pageContent[i+j]); if ( value == 0 ) { // Steal values of 0 to be used in the rebase chain nonRebaseLocationOffsets[nrIndex] = i+j; break; } } if ( nonRebaseLocationOffsets[nrIndex] == 0 ) { lastValue = (pint_t)P::getP(*lastLoc); pint_t newValue = ((lastValue - valueAdd) & valueMask); //warning(" no way to make non-rebase delta chain, terminate off=0x%03X, old value=0x%08lX, new value=0x%08lX", lastLocationOffset, (long)value, (long)newValue); P::setP(*lastLoc, newValue); return false; } i = nonRebaseLocationOffsets[nrIndex]; ++nrIndex; } // we can make chain. go back and add each non-rebase location to chain uint16_t prevOffset = lastLocationOffset; pint_t* prevLoc = (pint_t*)&pageContent[prevOffset]; for (int n=0; n < nrIndex; ++n) { uint16_t nOffset = nonRebaseLocationOffsets[n]; assert(nOffset != 0); pint_t* nLoc = (pint_t*)&pageContent[nOffset]; uint32_t delta2 = nOffset - prevOffset; pint_t value = (pint_t)P::getP(*prevLoc); pint_t newValue; if ( value == 0 ) newValue = (delta2 << deltaShift); else newValue = ((value - valueAdd) & valueMask) | (delta2 << deltaShift); //warning(" non-rebase delta = %d, to off=0x%03X, old value=0x%08lX, new value=0x%08lX", delta2, nOffset, (long)value, (long)newValue); P::setP(*prevLoc, newValue); prevOffset = nOffset; prevLoc = nLoc; } uint32_t delta3 = offset - prevOffset; pint_t value = (pint_t)P::getP(*prevLoc); pint_t newValue; if ( value == 0 ) newValue = (delta3 << deltaShift); else newValue = ((value - valueAdd) & valueMask) | (delta3 << deltaShift); //warning(" non-rebase delta = %d, to off=0x%03X, old value=0x%08lX, new value=0x%08lX", delta3, offset, (long)value, (long)newValue); P::setP(*prevLoc, newValue); return true; } template <typename P> void CacheBuilder::addPageStarts(uint8_t* pageContent, const bool bitmap[], const dyld_cache_slide_info2* info, std::vector<uint16_t>& pageStarts, std::vector<uint16_t>& pageExtras) { typedef typename P::uint_t pint_t; const pint_t deltaMask = (pint_t)(info->delta_mask); const pint_t valueMask = ~deltaMask; const uint32_t pageSize = info->page_size; const pint_t valueAdd = (pint_t)(info->value_add); uint16_t startValue = DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE; uint16_t lastLocationOffset = 0xFFFF; for(int i=0; i < pageSize/4; ++i) { unsigned offset = i*4; if ( bitmap[i] ) { if ( startValue == DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE ) { // found first rebase location in page startValue = i; } else if ( !makeRebaseChain<P>(pageContent, lastLocationOffset, offset, info) ) { // can't record all rebasings in one chain if ( (startValue & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA) == 0 ) { // switch page_start to "extras" which is a list of chain starts unsigned indexInExtras = (unsigned)pageExtras.size(); if ( indexInExtras > 0x3FFF ) { _diagnostics.error("rebase overflow in page extras"); return; } pageExtras.push_back(startValue); startValue = indexInExtras | DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA; } pageExtras.push_back(i); } lastLocationOffset = offset; } } if ( lastLocationOffset != 0xFFFF ) { // mark end of chain pint_t* lastLoc = (pint_t*)&pageContent[lastLocationOffset]; pint_t lastValue = (pint_t)P::getP(*lastLoc); pint_t newValue = ((lastValue - valueAdd) & valueMask); P::setP(*lastLoc, newValue); } if ( startValue & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA ) { // add end bit to extras pageExtras.back() |= DYLD_CACHE_SLIDE_PAGE_ATTR_END; } pageStarts.push_back(startValue); } template <typename P> void CacheBuilder::writeSlideInfoV2() { typedef typename P::uint_t pint_t; typedef typename P::E E; const uint32_t pageSize = 4096; // build one 1024/4096 bool bitmap per page (4KB/16KB) of DATA const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)_buffer + _buffer->header.mappingOffset); uint8_t* const dataStart = (uint8_t*)_buffer + mappings[1].fileOffset; uint8_t* const dataEnd = dataStart + mappings[1].size; unsigned pageCount = (unsigned)(mappings[1].size+pageSize-1)/pageSize; const long bitmapSize = pageCount*(pageSize/4)*sizeof(bool); bool* bitmap = (bool*)calloc(bitmapSize, 1); for (void* p : _pointersForASLR) { if ( (p < dataStart) || ( p > dataEnd) ) { _diagnostics.error("DATA pointer for sliding, out of range\n"); free(bitmap); return; } long byteOffset = (long)((uint8_t*)p - dataStart); if ( (byteOffset % 4) != 0 ) { _diagnostics.error("pointer not 4-byte aligned in DATA offset 0x%08lX\n", byteOffset); free(bitmap); return; } long boolIndex = byteOffset / 4; // work around <rdar://24941083> by ignoring pointers to be slid that are NULL on disk if ( *((pint_t*)p) == 0 ) { std::string dylibName; std::string segName; findDylibAndSegment(p, dylibName, segName); _diagnostics.warning("NULL pointer asked to be slid in %s at DATA region offset 0x%04lX of %s", segName.c_str(), byteOffset, dylibName.c_str()); continue; } bitmap[boolIndex] = true; } // fill in fixed info assert(_slideInfoFileOffset != 0); dyld_cache_slide_info2* info = (dyld_cache_slide_info2*)((uint8_t*)_buffer + _slideInfoFileOffset); info->version = 2; info->page_size = pageSize; info->delta_mask = _archLayout->pointerDeltaMask; info->value_add = (sizeof(pint_t) == 8) ? 0 : _archLayout->sharedMemoryStart; // only value_add for 32-bit archs // set page starts and extras for each page std::vector<uint16_t> pageStarts; std::vector<uint16_t> pageExtras; pageStarts.reserve(pageCount); uint8_t* pageContent = dataStart;; const bool* bitmapForPage = bitmap; for (unsigned i=0; i < pageCount; ++i) { //warning("page[%d]", i); addPageStarts<P>(pageContent, bitmapForPage, info, pageStarts, pageExtras); if ( _diagnostics.hasError() ) { free(bitmap); return; } pageContent += pageSize; bitmapForPage += (sizeof(bool)*(pageSize/4)); } free((void*)bitmap); // fill in computed info info->page_starts_offset = sizeof(dyld_cache_slide_info2); info->page_starts_count = (unsigned)pageStarts.size(); info->page_extras_offset = (unsigned)(sizeof(dyld_cache_slide_info2)+pageStarts.size()*sizeof(uint16_t)); info->page_extras_count = (unsigned)pageExtras.size(); uint16_t* pageStartsBuffer = (uint16_t*)((char*)info + info->page_starts_offset); uint16_t* pageExtrasBuffer = (uint16_t*)((char*)info + info->page_extras_offset); for (unsigned i=0; i < pageStarts.size(); ++i) pageStartsBuffer[i] = pageStarts[i]; for (unsigned i=0; i < pageExtras.size(); ++i) pageExtrasBuffer[i] = pageExtras[i]; // update header with final size _buffer->header.slideInfoSize = align(info->page_extras_offset + pageExtras.size()*sizeof(uint16_t), _archLayout->sharedRegionAlignP2); if ( _buffer->header.slideInfoSize > _slideInfoBufferSizeAllocated ) { _diagnostics.error("kernel slide info overflow buffer"); } //warning("pageCount=%u, page_starts_count=%lu, page_extras_count=%lu", pageCount, pageStarts.size(), pageExtras.size()); } /* void CacheBuilder::writeSlideInfoV1() { // build one 128-byte bitmap per page (4096) of DATA uint8_t* const dataStart = (uint8_t*)_buffer.get() + regions[1].fileOffset; uint8_t* const dataEnd = dataStart + regions[1].size; const long bitmapSize = (dataEnd - dataStart)/(4*8); uint8_t* bitmap = (uint8_t*)calloc(bitmapSize, 1); for (void* p : _pointersForASLR) { if ( (p < dataStart) || ( p > dataEnd) ) terminate("DATA pointer for sliding, out of range\n"); long offset = (long)((uint8_t*)p - dataStart); if ( (offset % 4) != 0 ) terminate("pointer not 4-byte aligned in DATA offset 0x%08lX\n", offset); long byteIndex = offset / (4*8); long bitInByte = (offset % 32) >> 2; bitmap[byteIndex] |= (1 << bitInByte); } // allocate worst case size block of all slide info const unsigned entry_size = 4096/(8*4); // 8 bits per byte, possible pointer every 4 bytes. const unsigned toc_count = (unsigned)bitmapSize/entry_size; dyld_cache_slide_info* slideInfo = (dyld_cache_slide_info*)((uint8_t*)_buffer + _slideInfoFileOffset); slideInfo->version = 1; slideInfo->toc_offset = sizeof(dyld_cache_slide_info); slideInfo->toc_count = toc_count; slideInfo->entries_offset = (slideInfo->toc_offset+2*toc_count+127)&(-128); slideInfo->entries_count = 0; slideInfo->entries_size = entry_size; // append each unique entry const dyldCacheSlideInfoEntry* bitmapAsEntries = (dyldCacheSlideInfoEntry*)bitmap; dyldCacheSlideInfoEntry* const entriesInSlidInfo = (dyldCacheSlideInfoEntry*)((char*)slideInfo+slideInfo->entries_offset()); int entry_count = 0; for (int i=0; i < toc_count; ++i) { const dyldCacheSlideInfoEntry* thisEntry = &bitmapAsEntries[i]; // see if it is same as one already added bool found = false; for (int j=0; j < entry_count; ++j) { if ( memcmp(thisEntry, &entriesInSlidInfo[j], entry_size) == 0 ) { slideInfo->set_toc(i, j); found = true; break; } } if ( !found ) { // append to end memcpy(&entriesInSlidInfo[entry_count], thisEntry, entry_size); slideInfo->set_toc(i, entry_count++); } } slideInfo->entries_count = entry_count; ::free((void*)bitmap); _buffer.header->slideInfoSize = align(slideInfo->entries_offset + entry_count*entry_size, _archLayout->sharedRegionAlignP2); } */ void CacheBuilder::fipsSign() { __block bool found = false; _buffer->forEachImage(^(const mach_header* mh, const char* installName) { __block void *hash_location = nullptr; // Return if this is not corecrypto if (strcmp(installName, "/usr/lib/system/libcorecrypto.dylib") != 0) { return; } found = true; auto parser = dyld3::MachOParser(mh, true); parser.forEachLocalSymbol(_diagnostics, ^(const char *symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool &stop) { if (strcmp(symbolName, "_fipspost_precalc_hmac") != 0) return; hash_location = (void *)(n_value - _archLayout->sharedMemoryStart + (uintptr_t)_buffer); stop = true; }); // Bail out if we did not find the symbol if (hash_location == nullptr) { _diagnostics.warning("Could not find _fipspost_precalc_hmac, skipping FIPS sealing"); return; } parser.forEachSection(^(const char *segName, const char *sectionName, uint32_t flags, const void *content, size_t size, bool illegalSectionSize, bool &stop) { // FIXME: If we ever implement userspace __TEXT_EXEC this will need to be updated if ( (strcmp(segName, "__TEXT" ) != 0) || (strcmp(sectionName, "__text") != 0) ) { return; } if (illegalSectionSize) { _diagnostics.error("FIPS section %s/%s extends beyond the end of the segment", segName, sectionName); return; } //We have _fipspost_precalc_hmac and __TEXT,__text, seal it unsigned char hmac_key = 0; CCHmac(kCCHmacAlgSHA256, &hmac_key, 1, content, size, hash_location); stop = true; }); }); if (!found) { _diagnostics.warning("Could not find /usr/lib/system/libcorecrypto.dylib, skipping FIPS sealing"); } } void CacheBuilder::codeSign() { uint8_t dscHashType; uint8_t dscHashSize; uint32_t dscDigestFormat; bool agile = false; // select which codesigning hash switch (_options.codeSigningDigestMode) { case DyldSharedCache::Agile: agile = true; // Fall through to SHA1, because the main code directory remains SHA1 for compatibility. case DyldSharedCache::SHA1only: dscHashType = CS_HASHTYPE_SHA1; dscHashSize = CS_HASH_SIZE_SHA1; dscDigestFormat = kCCDigestSHA1; break; case DyldSharedCache::SHA256only: dscHashType = CS_HASHTYPE_SHA256; dscHashSize = CS_HASH_SIZE_SHA256; dscDigestFormat = kCCDigestSHA256; break; default: _diagnostics.error("codeSigningDigestMode has unknown, unexpected value %d, bailing out.", _options.codeSigningDigestMode); return; } std::string cacheIdentifier = "com.apple.dyld.cache." + _options.archName; if ( _options.dylibsRemovedDuringMastering ) { if ( _options.optimizeStubs ) cacheIdentifier = "com.apple.dyld.cache." + _options.archName + ".release"; else cacheIdentifier = "com.apple.dyld.cache." + _options.archName + ".development"; } // get pointers into shared cache buffer size_t inBbufferSize = _currentFileSize; const uint8_t* inBuffer = (uint8_t*)_buffer; uint8_t* csBuffer = (uint8_t*)_buffer+inBbufferSize; // layout code signature contents uint32_t blobCount = agile ? 4 : 3; size_t idSize = cacheIdentifier.size()+1; // +1 for terminating 0 uint32_t slotCount = (uint32_t)((inBbufferSize + CS_PAGE_SIZE - 1) / CS_PAGE_SIZE); uint32_t xSlotCount = CSSLOT_REQUIREMENTS; size_t idOffset = offsetof(CS_CodeDirectory, end_withExecSeg); size_t hashOffset = idOffset+idSize + dscHashSize*xSlotCount; size_t hash256Offset = idOffset+idSize + CS_HASH_SIZE_SHA256*xSlotCount; size_t cdSize = hashOffset + (slotCount * dscHashSize); size_t cd256Size = agile ? hash256Offset + (slotCount * CS_HASH_SIZE_SHA256) : 0; size_t reqsSize = 12; size_t cmsSize = sizeof(CS_Blob); size_t cdOffset = sizeof(CS_SuperBlob) + blobCount*sizeof(CS_BlobIndex); size_t cd256Offset = cdOffset + cdSize; size_t reqsOffset = cd256Offset + cd256Size; // equals cdOffset + cdSize if not agile size_t cmsOffset = reqsOffset + reqsSize; size_t sbSize = cmsOffset + cmsSize; size_t sigSize = align(sbSize, 14); // keep whole cache 16KB aligned if ( _currentFileSize+sigSize > _allocatedBufferSize ) { _diagnostics.error("cache buffer too small to hold code signature (buffer size=%lldMB, signature size=%ldMB, free space=%lldMB)", _allocatedBufferSize/1024/1024, sigSize/1024/1024, (_allocatedBufferSize-_currentFileSize)/1024/1024); return; } // create overall code signature which is a superblob CS_SuperBlob* sb = reinterpret_cast<CS_SuperBlob*>(csBuffer); sb->magic = htonl(CSMAGIC_EMBEDDED_SIGNATURE); sb->length = htonl(sbSize); sb->count = htonl(blobCount); sb->index[0].type = htonl(CSSLOT_CODEDIRECTORY); sb->index[0].offset = htonl(cdOffset); sb->index[1].type = htonl(CSSLOT_REQUIREMENTS); sb->index[1].offset = htonl(reqsOffset); sb->index[2].type = htonl(CSSLOT_CMS_SIGNATURE); sb->index[2].offset = htonl(cmsOffset); if ( agile ) { sb->index[3].type = htonl(CSSLOT_ALTERNATE_CODEDIRECTORIES + 0); sb->index[3].offset = htonl(cd256Offset); } // fill in empty requirements CS_RequirementsBlob* reqs = (CS_RequirementsBlob*)(((char*)sb)+reqsOffset); reqs->magic = htonl(CSMAGIC_REQUIREMENTS); reqs->length = htonl(sizeof(CS_RequirementsBlob)); reqs->data = 0; // initialize fixed fields of Code Directory CS_CodeDirectory* cd = (CS_CodeDirectory*)(((char*)sb)+cdOffset); cd->magic = htonl(CSMAGIC_CODEDIRECTORY); cd->length = htonl(cdSize); cd->version = htonl(0x20400); // supports exec segment cd->flags = htonl(kSecCodeSignatureAdhoc); cd->hashOffset = htonl(hashOffset); cd->identOffset = htonl(idOffset); cd->nSpecialSlots = htonl(xSlotCount); cd->nCodeSlots = htonl(slotCount); cd->codeLimit = htonl(inBbufferSize); cd->hashSize = dscHashSize; cd->hashType = dscHashType; cd->platform = 0; // not platform binary cd->pageSize = __builtin_ctz(CS_PAGE_SIZE); // log2(CS_PAGE_SIZE); cd->spare2 = 0; // unused (must be zero) cd->scatterOffset = 0; // not supported anymore cd->teamOffset = 0; // no team ID cd->spare3 = 0; // unused (must be zero) cd->codeLimit64 = 0; // falls back to codeLimit // executable segment info const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)_buffer + _buffer->header.mappingOffset); cd->execSegBase = htonll(mappings[0].fileOffset); // base of TEXT segment cd->execSegLimit = htonll(mappings[0].size); // size of TEXT segment cd->execSegFlags = 0; // not a main binary // initialize dynamic fields of Code Directory strcpy((char*)cd + idOffset, cacheIdentifier.c_str()); // add special slot hashes uint8_t* hashSlot = (uint8_t*)cd + hashOffset; uint8_t* reqsHashSlot = &hashSlot[-CSSLOT_REQUIREMENTS*dscHashSize]; CCDigest(dscDigestFormat, (uint8_t*)reqs, sizeof(CS_RequirementsBlob), reqsHashSlot); CS_CodeDirectory* cd256; uint8_t* hash256Slot; uint8_t* reqsHash256Slot; if ( agile ) { // Note that the assumption here is that the size up to the hashes is the same as for // sha1 code directory, and that they come last, after everything else. cd256 = (CS_CodeDirectory*)(((char*)sb)+cd256Offset); cd256->magic = htonl(CSMAGIC_CODEDIRECTORY); cd256->length = htonl(cd256Size); cd256->version = htonl(0x20400); // supports exec segment cd256->flags = htonl(kSecCodeSignatureAdhoc); cd256->hashOffset = htonl(hash256Offset); cd256->identOffset = htonl(idOffset); cd256->nSpecialSlots = htonl(xSlotCount); cd256->nCodeSlots = htonl(slotCount); cd256->codeLimit = htonl(inBbufferSize); cd256->hashSize = CS_HASH_SIZE_SHA256; cd256->hashType = CS_HASHTYPE_SHA256; cd256->platform = 0; // not platform binary cd256->pageSize = __builtin_ctz(CS_PAGE_SIZE); // log2(CS_PAGE_SIZE); cd256->spare2 = 0; // unused (must be zero) cd256->scatterOffset = 0; // not supported anymore cd256->teamOffset = 0; // no team ID cd256->spare3 = 0; // unused (must be zero) cd256->codeLimit64 = 0; // falls back to codeLimit // executable segment info cd256->execSegBase = cd->execSegBase; cd256->execSegLimit = cd->execSegLimit; cd256->execSegFlags = cd->execSegFlags; // initialize dynamic fields of Code Directory strcpy((char*)cd256 + idOffset, cacheIdentifier.c_str()); // add special slot hashes hash256Slot = (uint8_t*)cd256 + hash256Offset; reqsHash256Slot = &hash256Slot[-CSSLOT_REQUIREMENTS*CS_HASH_SIZE_SHA256]; CCDigest(kCCDigestSHA256, (uint8_t*)reqs, sizeof(CS_RequirementsBlob), reqsHash256Slot); } else { cd256 = NULL; hash256Slot = NULL; reqsHash256Slot = NULL; } // fill in empty CMS blob for ad-hoc signing CS_Blob* cms = (CS_Blob*)(((char*)sb)+cmsOffset); cms->magic = htonl(CSMAGIC_BLOBWRAPPER); cms->length = htonl(sizeof(CS_Blob)); // alter header of cache to record size and location of code signature // do this *before* hashing each page _buffer->header.codeSignatureOffset = inBbufferSize; _buffer->header.codeSignatureSize = sigSize; // compute hashes const uint8_t* code = inBuffer; for (uint32_t i=0; i < slotCount; ++i) { CCDigest(dscDigestFormat, code, CS_PAGE_SIZE, hashSlot); hashSlot += dscHashSize; if ( agile ) { CCDigest(kCCDigestSHA256, code, CS_PAGE_SIZE, hash256Slot); hash256Slot += CS_HASH_SIZE_SHA256; } code += CS_PAGE_SIZE; } // hash of entire code directory (cdHash) uses same hash as each page uint8_t fullCdHash[dscHashSize]; CCDigest(dscDigestFormat, (const uint8_t*)cd, cdSize, fullCdHash); // Note: cdHash is defined as first 20 bytes of hash memcpy(_cdHashFirst, fullCdHash, 20); if ( agile ) { uint8_t fullCdHash256[CS_HASH_SIZE_SHA256]; CCDigest(kCCDigestSHA256, (const uint8_t*)cd256, cd256Size, fullCdHash256); // Note: cdHash is defined as first 20 bytes of hash, even for sha256 memcpy(_cdHashSecond, fullCdHash256, 20); } else { memset(_cdHashSecond, 0, 20); } // increase file size to include newly append code signature _currentFileSize += sigSize; } const bool CacheBuilder::agileSignature() { return _options.codeSigningDigestMode == DyldSharedCache::Agile; } static const std::string cdHash(uint8_t hash[20]) { char buff[48]; for (int i = 0; i < 20; ++i) sprintf(&buff[2*i], "%2.2x", hash[i]); return buff; } const std::string CacheBuilder::cdHashFirst() { return cdHash(_cdHashFirst); } const std::string CacheBuilder::cdHashSecond() { return cdHash(_cdHashSecond); } void CacheBuilder::addCachedDylibsImageGroup(dyld3::ImageProxyGroup* dylibGroup) { const dyld3::launch_cache::binary_format::ImageGroup* groupBinary = dylibGroup->makeImageGroupBinary(_diagnostics, _s_neverStubEliminate); if (!groupBinary) return; dyld3::launch_cache::ImageGroup group(groupBinary); size_t groupSize = group.size(); if ( _currentFileSize+groupSize > _allocatedBufferSize ) { _diagnostics.error("cache buffer too small to hold group[0] info (buffer size=%lldMB, group size=%ldMB, free space=%lldMB)", _allocatedBufferSize/1024/1024, groupSize/1024/1024, (_allocatedBufferSize-_currentFileSize)/1024/1024); return; } // append ImageGroup data to read-only region of cache uint8_t* loc = (uint8_t*)_buffer + _currentFileSize; memcpy(loc, groupBinary, groupSize); dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)_buffer + _buffer->header.mappingOffset); _buffer->header.dylibsImageGroupAddr = mappings[2].address + (_currentFileSize - mappings[2].fileOffset); _buffer->header.dylibsImageGroupSize = (uint32_t)groupSize; _currentFileSize += groupSize; free((void*)groupBinary); } void CacheBuilder::addCachedOtherDylibsImageGroup(dyld3::ImageProxyGroup* otherGroup) { const dyld3::launch_cache::binary_format::ImageGroup* groupBinary = otherGroup->makeImageGroupBinary(_diagnostics); if (!groupBinary) return; dyld3::launch_cache::ImageGroup group(groupBinary); size_t groupSize = group.size(); if ( _currentFileSize+groupSize > _allocatedBufferSize ) { _diagnostics.error("cache buffer too small to hold group[1] info (buffer size=%lldMB, group size=%ldMB, free space=%lldMB)", _allocatedBufferSize/1024/1024, groupSize/1024/1024, (_allocatedBufferSize-_currentFileSize)/1024/1024); return; } // append ImageGroup data to read-only region of cache uint8_t* loc = (uint8_t*)_buffer + _currentFileSize; memcpy(loc, groupBinary, groupSize); dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)_buffer + _buffer->header.mappingOffset); _buffer->header.otherImageGroupAddr = mappings[2].address + (_currentFileSize - mappings[2].fileOffset); _buffer->header.otherImageGroupSize = (uint32_t)groupSize; _currentFileSize += groupSize; free((void*)groupBinary); } void CacheBuilder::addClosures(const std::map<std::string, const dyld3::launch_cache::binary_format::Closure*>& closures) { // preflight space needed size_t closuresSpace = 0; for (const auto& entry : closures) { dyld3::launch_cache::Closure closure(entry.second); closuresSpace += closure.size(); } size_t freeSpace = _allocatedBufferSize - _currentFileSize; if ( closuresSpace > freeSpace ) { _diagnostics.error("cache buffer too small to hold all closures (buffer size=%lldMB, closures size=%ldMB, free space=%ldMB)", _allocatedBufferSize/1024/1024, closuresSpace/1024/1024, freeSpace/1024/1024); return; } dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)_buffer + _buffer->header.mappingOffset); _buffer->header.progClosuresAddr = mappings[2].address + (_currentFileSize - mappings[2].fileOffset); uint8_t* closuresBase = (uint8_t*)_buffer + _currentFileSize; std::vector<DylibIndexTrie::Entry> closureEntrys; uint32_t currentClosureOffset = 0; for (const auto& entry : closures) { const dyld3::launch_cache::binary_format::Closure* closBuf = entry.second; closureEntrys.push_back(DylibIndexTrie::Entry(entry.first, DylibIndex(currentClosureOffset))); dyld3::launch_cache::Closure closure(closBuf); size_t size = closure.size(); assert((size % 4) == 0); memcpy(closuresBase+currentClosureOffset, closBuf, size); currentClosureOffset += size; freeSpace -= size; free((void*)closBuf); } _buffer->header.progClosuresSize = currentClosureOffset; _currentFileSize += currentClosureOffset; freeSpace = _allocatedBufferSize - _currentFileSize; // build trie of indexes into closures list DylibIndexTrie closureTrie(closureEntrys); std::vector<uint8_t> trieBytes; closureTrie.emit(trieBytes); while ( (trieBytes.size() % 8) != 0 ) trieBytes.push_back(0); if ( trieBytes.size() > freeSpace ) { _diagnostics.error("cache buffer too small to hold all closures trie (buffer size=%lldMB, trie size=%ldMB, free space=%ldMB)", _allocatedBufferSize/1024/1024, trieBytes.size()/1024/1024, freeSpace/1024/1024); return; } memcpy((uint8_t*)_buffer + _currentFileSize, &trieBytes[0], trieBytes.size()); _buffer->header.progClosuresTrieAddr = mappings[2].address + (_currentFileSize - mappings[2].fileOffset); _buffer->header.progClosuresTrieSize = trieBytes.size(); _currentFileSize += trieBytes.size(); } |