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--- dyld/dyld-852/dyld3/shared-cache/DyldSharedCache.cpp
+++ /dev/null
@@ -1,1217 +0,0 @@
-/* -*- 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 <dirent.h>
-#include <sys/errno.h>
-#include <sys/fcntl.h>
-#include <sys/param.h>
-#include <mach/mach.h>
-#include <mach-o/loader.h>
-#include <mach-o/fat.h>
-#include <mach-o/dyld_priv.h>
-#include <assert.h>
-#include <unistd.h>
-#include <dlfcn.h>
-
-#if BUILDING_CACHE_BUILDER
-#include <set>
-#include <string>
-#include <vector>
-#include <unordered_map>
-#include <unordered_set>
-#include "SharedCacheBuilder.h"
-#include "FileUtils.h"
-#endif
-
-#define NO_ULEB
-#include "MachOLoaded.h"
-#include "ClosureFileSystemPhysical.h"
-#include "DyldSharedCache.h"
-#include "Trie.hpp"
-#include "StringUtils.h"
-
-#include "objc-shared-cache.h"
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-#include "JSONWriter.h"
-#include <sstream>
-#endif
-
-#if (BUILDING_LIBDYLD || BUILDING_DYLD)
-VIS_HIDDEN bool gEnableSharedCacheDataConst = false;
-#endif
-
-
-#if BUILDING_CACHE_BUILDER
-DyldSharedCache::CreateResults DyldSharedCache::create(const CreateOptions& options,
- const dyld3::closure::FileSystem& fileSystem,
- const std::vector<MappedMachO>& dylibsToCache,
- const std::vector<MappedMachO>& otherOsDylibs,
- const std::vector<MappedMachO>& osExecutables)
-{
- CreateResults results;
- SharedCacheBuilder cache(options, fileSystem);
- if (!cache.errorMessage().empty()) {
- results.errorMessage = cache.errorMessage();
- return results;
- }
-
- std::vector<FileAlias> aliases;
- switch ( options.platform ) {
- case dyld3::Platform::iOS:
- case dyld3::Platform::watchOS:
- case dyld3::Platform::tvOS:
- // FIXME: embedded cache builds should be getting aliases from manifest
- aliases.push_back({"/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit", "/System/Library/Frameworks/IOKit.framework/IOKit"});
- aliases.push_back({"/usr/lib/libstdc++.6.dylib", "/usr/lib/libstdc++.dylib"});
- aliases.push_back({"/usr/lib/libstdc++.6.dylib", "/usr/lib/libstdc++.6.0.9.dylib"});
- aliases.push_back({"/usr/lib/libz.1.dylib", "/usr/lib/libz.dylib"});
- aliases.push_back({"/usr/lib/libSystem.B.dylib", "/usr/lib/libSystem.dylib"});
- aliases.push_back({"/System/Library/Frameworks/Foundation.framework/Foundation", "/usr/lib/libextension.dylib"}); // <rdar://44315703>
- break;
- default:
- break;
- }
-
- cache.build(dylibsToCache, otherOsDylibs, osExecutables, aliases);
-
- results.agileSignature = cache.agileSignature();
- results.cdHashFirst = cache.cdHashFirst();
- results.cdHashSecond = cache.cdHashSecond();
- results.warnings = cache.warnings();
- results.evictions = cache.evictions();
- if ( cache.errorMessage().empty() ) {
- if ( !options.outputFilePath.empty() ) {
- // write cache file, if path non-empty
- cache.writeFile(options.outputFilePath);
- }
- if ( !options.outputMapFilePath.empty() ) {
- // write map file, if path non-empty
- cache.writeMapFile(options.outputMapFilePath);
- }
- }
- results.errorMessage = cache.errorMessage();
- cache.deleteBuffer();
- return results;
-}
-
-bool DyldSharedCache::verifySelfContained(std::vector<MappedMachO>& dylibsToCache,
- std::unordered_set<std::string>& badZippered,
- MappedMachO (^loader)(const std::string& runtimePath, Diagnostics& diag),
- std::vector<std::pair<DyldSharedCache::MappedMachO, std::set<std::string>>>& rejected)
-{
- // build map of dylibs
- __block std::map<std::string, std::set<std::string>> badDylibs;
- __block std::set<std::string> knownDylibs;
- for (const DyldSharedCache::MappedMachO& dylib : dylibsToCache) {
- std::set<std::string> reasons;
- if ( dylib.mh->canBePlacedInDyldCache(dylib.runtimePath.c_str(), ^(const char* msg) { badDylibs[dylib.runtimePath].insert(msg);}) ) {
- knownDylibs.insert(dylib.runtimePath);
- knownDylibs.insert(dylib.mh->installName());
- } else {
- badDylibs[dylib.runtimePath].insert("");
- }
- }
-
- // check all dependencies to assure every dylib in cache only depends on other dylibs in cache
- __block std::set<std::string> missingWeakDylibs;
- __block bool doAgain = true;
- while ( doAgain ) {
- __block std::vector<DyldSharedCache::MappedMachO> foundMappings;
- doAgain = false;
- // scan dylib list making sure all dependents are in dylib list
- for (const DyldSharedCache::MappedMachO& dylib : dylibsToCache) {
- if ( badDylibs.count(dylib.runtimePath) != 0 )
- continue;
- dylib.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
- if ( isWeak && (missingWeakDylibs.count(loadPath) != 0) )
- return;
- if ( knownDylibs.count(loadPath) == 0 ) {
- doAgain = true;
- if ( badZippered.count(loadPath) != 0 ) {
- badDylibs[dylib.runtimePath].insert("");
- knownDylibs.erase(dylib.runtimePath);
- knownDylibs.erase(dylib.mh->installName());
- badZippered.insert(dylib.runtimePath);
- badZippered.insert(dylib.mh->installName());
- return;
- }
- Diagnostics diag;
- MappedMachO foundMapping;
- if ( badDylibs.count(loadPath) == 0 )
- foundMapping = loader(loadPath, diag);
- if ( foundMapping.length == 0 ) {
- // We allow weakly linked dylibs to be missing only if they are not present on disk
- // The shared cache doesn't contain enough information to patch them in later if they are
- // found on disk, so we don't want to pull something in to cache and cut it off from a dylib it
- // could have used.
- if ( isWeak ) {
- missingWeakDylibs.insert(loadPath);
- return;
- }
-
- if (diag.hasError())
- badDylibs[dylib.runtimePath].insert(diag.errorMessage());
- else
- badDylibs[dylib.runtimePath].insert(std::string("Could not find dependency '") + loadPath +"'");
- knownDylibs.erase(dylib.runtimePath);
- knownDylibs.erase(dylib.mh->installName());
- }
- else {
- std::set<std::string> reasons;
- if ( foundMapping.mh->canBePlacedInDyldCache(foundMapping.runtimePath.c_str(), ^(const char* msg) { badDylibs[foundMapping.runtimePath].insert(msg);})) {
- // see if existing mapping was returned
- bool alreadyInVector = false;
- for (const MappedMachO& existing : dylibsToCache) {
- if ( existing.mh == foundMapping.mh ) {
- alreadyInVector = true;
- break;
- }
- }
- if ( !alreadyInVector )
- foundMappings.push_back(foundMapping);
- knownDylibs.insert(loadPath);
- knownDylibs.insert(foundMapping.runtimePath);
- knownDylibs.insert(foundMapping.mh->installName());
- } else {
- badDylibs[dylib.runtimePath].insert("");
- }
- }
- }
- });
- }
- dylibsToCache.insert(dylibsToCache.end(), foundMappings.begin(), foundMappings.end());
- // remove bad dylibs
- const auto badDylibsCopy = badDylibs;
- dylibsToCache.erase(std::remove_if(dylibsToCache.begin(), dylibsToCache.end(), [&](const DyldSharedCache::MappedMachO& dylib) {
- auto i = badDylibsCopy.find(dylib.runtimePath);
- if ( i != badDylibsCopy.end()) {
- // Only add the warning if we are not a bad zippered dylib
- if ( badZippered.count(dylib.runtimePath) == 0 )
- rejected.push_back(std::make_pair(dylib, i->second));
- return true;
- }
- else {
- return false;
- }
- }), dylibsToCache.end());
- }
-
- return badDylibs.empty();
-}
-#endif
-
-template<typename T>
-const T DyldSharedCache::getAddrField(uint64_t addr) const {
- uint64_t slide = (uint64_t)this - unslidLoadAddress();
- return (const T)(addr + slide);
-}
-
-uint64_t DyldSharedCache::getCodeSignAddress() const
-{
- auto mappings = (const dyld_cache_mapping_info*)((uint8_t*)this + header.mappingOffset);
- return mappings[header.mappingCount-1].address + mappings[header.mappingCount-1].size;
-}
-
-void DyldSharedCache::forEachRegion(void (^handler)(const void* content, uint64_t vmAddr, uint64_t size,
- uint32_t initProt, uint32_t maxProt, uint64_t flags)) const
-{
- // <rdar://problem/49875993> sanity check cache header
- if ( strncmp(header.magic, "dyld_v1", 7) != 0 )
- return;
- if ( header.mappingOffset > 1024 )
- return;
- if ( header.mappingCount > 20 )
- return;
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset) ) {
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- const dyld_cache_mapping_info* mappingsEnd = &mappings[header.mappingCount];
- for (const dyld_cache_mapping_info* m=mappings; m < mappingsEnd; ++m) {
- handler((char*)this + m->fileOffset, m->address, m->size, m->initProt, m->maxProt, 0);
- }
- } else {
- const dyld_cache_mapping_and_slide_info* mappings = (const dyld_cache_mapping_and_slide_info*)((char*)this + header.mappingWithSlideOffset);
- const dyld_cache_mapping_and_slide_info* mappingsEnd = &mappings[header.mappingCount];
- for (const dyld_cache_mapping_and_slide_info* m=mappings; m < mappingsEnd; ++m) {
- handler((char*)this + m->fileOffset, m->address, m->size, m->initProt, m->maxProt, m->flags);
- }
- }
-}
-
-bool DyldSharedCache::inCache(const void* addr, size_t length, bool& readOnly) const
-{
- // quick out if before start of cache
- if ( addr < this )
- return false;
-
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- uintptr_t unslidStart = (uintptr_t)addr - slide;
-
- // quick out if after end of cache
- const dyld_cache_mapping_info* lastMapping = &mappings[header.mappingCount - 1];
- if ( unslidStart > (lastMapping->address + lastMapping->size) )
- return false;
-
- // walk cache regions
- const dyld_cache_mapping_info* mappingsEnd = &mappings[header.mappingCount];
- uintptr_t unslidEnd = unslidStart + length;
- for (const dyld_cache_mapping_info* m=mappings; m < mappingsEnd; ++m) {
- if ( (unslidStart >= m->address) && (unslidEnd < (m->address+m->size)) ) {
- readOnly = ((m->initProt & VM_PROT_WRITE) == 0);
- return true;
- }
- }
-
- return false;
-}
-
-bool DyldSharedCache::isAlias(const char* path) const {
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- // paths for aliases are store between cache header and first segment
- return path < ((char*)mappings[0].address + slide);
-}
-
-void DyldSharedCache::forEachImage(void (^handler)(const mach_header* mh, const char* installName)) const
-{
- const dyld_cache_image_info* dylibs = (dyld_cache_image_info*)((char*)this + header.imagesOffset);
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- if ( mappings[0].fileOffset != 0 )
- return;
- uint64_t firstImageOffset = 0;
- uint64_t firstRegionAddress = mappings[0].address;
- for (uint32_t i=0; i < header.imagesCount; ++i) {
- const char* dylibPath = (char*)this + dylibs[i].pathFileOffset;
- uint64_t offset = dylibs[i].address - firstRegionAddress;
- if ( firstImageOffset == 0 )
- firstImageOffset = offset;
- // skip over aliases
- if ( dylibs[i].pathFileOffset < firstImageOffset)
- continue;
- const mach_header* mh = (mach_header*)((char*)this + offset);
- handler(mh, dylibPath);
- }
-}
-
-void DyldSharedCache::forEachImageEntry(void (^handler)(const char* path, uint64_t mTime, uint64_t inode)) const
-{
- const dyld_cache_image_info* dylibs = (dyld_cache_image_info*)((char*)this + header.imagesOffset);
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- if ( mappings[0].fileOffset != 0 )
- return;
- uint64_t firstImageOffset = 0;
- uint64_t firstRegionAddress = mappings[0].address;
- for (uint32_t i=0; i < header.imagesCount; ++i) {
- const char* dylibPath = (char*)this + dylibs[i].pathFileOffset;
- uint64_t offset = dylibs[i].address - firstRegionAddress;
- if ( firstImageOffset == 0 )
- firstImageOffset = offset;
- // skip over aliases
- if ( dylibs[i].pathFileOffset < firstImageOffset)
- continue;
- handler(dylibPath, dylibs[i].modTime, dylibs[i].inode);
- }
-}
-
-const bool DyldSharedCache::hasLocalSymbolsInfo() const
-{
- return (header.localSymbolsOffset != 0 && header.mappingOffset > offsetof(dyld_cache_header,localSymbolsSize));
-}
-
-const void* DyldSharedCache::getLocalNlistEntries() const
-{
- // check for cache without local symbols info
- if (!this->hasLocalSymbolsInfo())
- return nullptr;
- const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
- return (uint8_t*)localInfo + localInfo->nlistOffset;
-}
-
-const uint32_t DyldSharedCache::getLocalNlistCount() const
-{
- // check for cache without local symbols info
- if (!this->hasLocalSymbolsInfo())
- return 0;
- const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
- return localInfo->nlistCount;
-}
-
-const char* DyldSharedCache::getLocalStrings() const
-{
- // check for cache without local symbols info
- if (!this->hasLocalSymbolsInfo())
- return nullptr;
- const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
- return (char*)localInfo + localInfo->stringsOffset;
-}
-
-const uint32_t DyldSharedCache::getLocalStringsSize() const
-{
- // check for cache without local symbols info
- if (!this->hasLocalSymbolsInfo())
- return 0;
- const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
- return localInfo->stringsSize;
-}
-
- void DyldSharedCache::forEachLocalSymbolEntry(void (^handler)(uint32_t dylibOffset, uint32_t nlistStartIndex, uint32_t nlistCount, bool& stop)) const
-{
- // check for cache without local symbols info
- if (!this->hasLocalSymbolsInfo())
- return;
- const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
- const auto localEntries = (dyld_cache_local_symbols_entry*)((uint8_t*)localInfo + localInfo->entriesOffset);
- bool stop = false;
- for (uint32_t i = 0; i < localInfo->entriesCount; i++) {
- dyld_cache_local_symbols_entry localEntry = localEntries[i];
- handler(localEntry.dylibOffset, localEntry.nlistStartIndex, localEntry.nlistCount, stop);
- }
-}
-
-
-const mach_header* DyldSharedCache::getIndexedImageEntry(uint32_t index, uint64_t& mTime, uint64_t& inode) const
-{
- const dyld_cache_image_info* dylibs = (dyld_cache_image_info*)((char*)this + header.imagesOffset);
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- mTime = dylibs[index].modTime;
- inode = dylibs[index].inode;
- return (mach_header*)((uint8_t*)this + dylibs[index].address - mappings[0].address);
-}
-
-
- const char* DyldSharedCache::getIndexedImagePath(uint32_t index) const
-{
- auto dylibs = (const dyld_cache_image_info*)((char*)this + header.imagesOffset);
- return (char*)this + dylibs[index].pathFileOffset;
-}
-
-void DyldSharedCache::forEachImageTextSegment(void (^handler)(uint64_t loadAddressUnslid, uint64_t textSegmentSize, const uuid_t dylibUUID, const char* installName, bool& stop)) const
-{
- // check for old cache without imagesText array
- if ( (header.mappingOffset <= __offsetof(dyld_cache_header, imagesTextOffset)) || (header.imagesTextCount == 0) )
- return;
-
- // walk imageText table and call callback for each entry
- const dyld_cache_image_text_info* imagesText = (dyld_cache_image_text_info*)((char*)this + header.imagesTextOffset);
- const dyld_cache_image_text_info* imagesTextEnd = &imagesText[header.imagesTextCount];
- bool stop = false;
- for (const dyld_cache_image_text_info* p=imagesText; p < imagesTextEnd && !stop; ++p) {
- handler(p->loadAddress, p->textSegmentSize, p->uuid, (char*)this + p->pathOffset, stop);
- }
-}
-
-bool DyldSharedCache::addressInText(uint32_t cacheOffset, uint32_t* imageIndex) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- if ( cacheOffset > mappings[0].size )
- return false;
- uint64_t targetAddr = mappings[0].address + cacheOffset;
- // walk imageText table and call callback for each entry
- const dyld_cache_image_text_info* imagesText = (dyld_cache_image_text_info*)((char*)this + header.imagesTextOffset);
- const dyld_cache_image_text_info* imagesTextEnd = &imagesText[header.imagesTextCount];
- for (const dyld_cache_image_text_info* p=imagesText; p < imagesTextEnd; ++p) {
- if ( (p->loadAddress <= targetAddr) && (targetAddr < p->loadAddress+p->textSegmentSize) ) {
- *imageIndex = (uint32_t)(p-imagesText);
- return true;
- }
- }
- return false;
-}
-
-const char* DyldSharedCache::archName() const
-{
- const char* archSubString = ((char*)this) + 7;
- while (*archSubString == ' ')
- ++archSubString;
- return archSubString;
-}
-
-
-dyld3::Platform DyldSharedCache::platform() const
-{
- return (dyld3::Platform)header.platform;
-}
-
-#if BUILDING_CACHE_BUILDER
-std::string DyldSharedCache::mapFile() const
-{
- __block std::string result;
- __block std::vector<uint64_t> regionStartAddresses;
- __block std::vector<uint64_t> regionSizes;
- __block std::vector<uint64_t> regionFileOffsets;
-
- result.reserve(256*1024);
- forEachRegion(^(const void* content, uint64_t vmAddr, uint64_t size,
- uint32_t initProt, uint32_t maxProt, uint64_t flags) {
- regionStartAddresses.push_back(vmAddr);
- regionSizes.push_back(size);
- regionFileOffsets.push_back((uint8_t*)content - (uint8_t*)this);
- char lineBuffer[256];
- const char* prot = "RW";
- if ( maxProt == (VM_PROT_EXECUTE|VM_PROT_READ) )
- prot = "EX";
- else if ( maxProt == VM_PROT_READ )
- prot = "RO";
- if ( size > 1024*1024 )
- sprintf(lineBuffer, "mapping %s %4lluMB 0x%0llX -> 0x%0llX\n", prot, size/(1024*1024), vmAddr, vmAddr+size);
- else
- sprintf(lineBuffer, "mapping %s %4lluKB 0x%0llX -> 0x%0llX\n", prot, size/1024, vmAddr, vmAddr+size);
- result += lineBuffer;
- });
-
- // TODO: add linkedit breakdown
- result += "\n\n";
-
- forEachImage(^(const mach_header* mh, const char* installName) {
- result += std::string(installName) + "\n";
- const dyld3::MachOFile* mf = (dyld3::MachOFile*)mh;
- mf->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& info, bool& stop) {
- char lineBuffer[256];
- sprintf(lineBuffer, "\t%16s 0x%08llX -> 0x%08llX\n", info.segName, info.vmAddr, info.vmAddr+info.vmSize);
- result += lineBuffer;
- });
- result += "\n";
- });
-
- return result;
-}
-#endif
-
-
-uint64_t DyldSharedCache::unslidLoadAddress() const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- return mappings[0].address;
-}
-
-void DyldSharedCache::getUUID(uuid_t uuid) const
-{
- memcpy(uuid, header.uuid, sizeof(uuid_t));
-}
-
-uint64_t DyldSharedCache::mappedSize() const
-{
- __block uint64_t startAddr = 0;
- __block uint64_t endAddr = 0;
- forEachRegion(^(const void* content, uint64_t vmAddr, uint64_t size,
- uint32_t initProt, uint32_t maxProt, uint64_t flags) {
- if ( startAddr == 0 )
- startAddr = vmAddr;
- uint64_t end = vmAddr+size;
- if ( end > endAddr )
- endAddr = end;
- });
- return (endAddr - startAddr);
-}
-
-bool DyldSharedCache::findMachHeaderImageIndex(const mach_header* mh, uint32_t& imageIndex) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- uint64_t unslidMh = (uintptr_t)mh - slide;
- const dyld_cache_image_info* dylibs = (dyld_cache_image_info*)((char*)this + header.imagesOffset);
- for (uint32_t i=0; i < header.imagesCount; ++i) {
- if ( dylibs[i].address == unslidMh ) {
- imageIndex = i;
- return true;
- }
- }
- return false;
-}
-
-bool DyldSharedCache::hasImagePath(const char* dylibPath, uint32_t& imageIndex) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- if ( mappings[0].fileOffset != 0 )
- return false;
- if ( header.mappingOffset >= 0x118 ) {
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- const uint8_t* dylibTrieStart = (uint8_t*)(this->header.dylibsTrieAddr + slide);
- const uint8_t* dylibTrieEnd = dylibTrieStart + this->header.dylibsTrieSize;
-
- Diagnostics diag;
- const uint8_t* imageNode = dyld3::MachOLoaded::trieWalk(diag, dylibTrieStart, dylibTrieEnd, dylibPath);
- if ( imageNode != NULL ) {
- imageIndex = (uint32_t)dyld3::MachOFile::read_uleb128(diag, imageNode, dylibTrieEnd);
- return true;
- }
- }
- else {
- const dyld_cache_image_info* dylibs = (dyld_cache_image_info*)((char*)this + header.imagesOffset);
- uint64_t firstImageOffset = 0;
- uint64_t firstRegionAddress = mappings[0].address;
- for (uint32_t i=0; i < header.imagesCount; ++i) {
- const char* aPath = (char*)this + dylibs[i].pathFileOffset;
- if ( strcmp(aPath, dylibPath) == 0 ) {
- imageIndex = i;
- return true;
- }
- uint64_t offset = dylibs[i].address - firstRegionAddress;
- if ( firstImageOffset == 0 )
- firstImageOffset = offset;
- // skip over aliases
- if ( dylibs[i].pathFileOffset < firstImageOffset)
- continue;
- }
- }
-
- return false;
-}
-
-bool DyldSharedCache::isOverridablePath(const char* dylibPath) const
-{
- // all dylibs in customer dyld cache cannot be overridden except libdispatch.dylib
- if ( header.cacheType == kDyldSharedCacheTypeProduction ) {
- return (strcmp(dylibPath, "/usr/lib/system/libdispatch.dylib") == 0);
- }
- // in dev caches we can override all paths
- return true;
-}
-
-bool DyldSharedCache::hasNonOverridablePath(const char* dylibPath) const
-{
- // all dylibs in customer dyld cache cannot be overridden except libdispatch.dylib
- bool pathIsInDyldCacheWhichCannotBeOverridden = false;
- if ( header.cacheType == kDyldSharedCacheTypeProduction ) {
- uint32_t imageIndex;
- pathIsInDyldCacheWhichCannotBeOverridden = this->hasImagePath(dylibPath, imageIndex);
- if ( pathIsInDyldCacheWhichCannotBeOverridden && isOverridablePath(dylibPath) )
- pathIsInDyldCacheWhichCannotBeOverridden = false;
- }
- return pathIsInDyldCacheWhichCannotBeOverridden;
-}
-
-#if !BUILDING_LIBDSC
-const dyld3::closure::Image* DyldSharedCache::findDlopenOtherImage(const char* path) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- if ( mappings[0].fileOffset != 0 )
- return nullptr;
- if ( header.mappingOffset < __offsetof(dyld_cache_header, otherImageArrayAddr) )
- return nullptr;
- if ( header.otherImageArrayAddr == 0 )
- return nullptr;
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- const uint8_t* dylibTrieStart = (uint8_t*)(this->header.otherTrieAddr + slide);
- const uint8_t* dylibTrieEnd = dylibTrieStart + this->header.otherTrieSize;
-
- Diagnostics diag;
- const uint8_t* imageNode = dyld3::MachOLoaded::trieWalk(diag, dylibTrieStart, dylibTrieEnd, path);
- if ( imageNode != NULL ) {
- dyld3::closure::ImageNum imageNum = (uint32_t)dyld3::MachOFile::read_uleb128(diag, imageNode, dylibTrieEnd);
- uint64_t arrayAddrOffset = header.otherImageArrayAddr - mappings[0].address;
- const dyld3::closure::ImageArray* otherImageArray = (dyld3::closure::ImageArray*)((char*)this + arrayAddrOffset);
- return otherImageArray->imageForNum(imageNum);
- }
-
- return nullptr;
-}
-
-const dyld3::closure::LaunchClosure* DyldSharedCache::findClosure(const char* executablePath) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- const uint8_t* executableTrieStart = (uint8_t*)(this->header.progClosuresTrieAddr + slide);
- const uint8_t* executableTrieEnd = executableTrieStart + this->header.progClosuresTrieSize;
- const uint8_t* closuresStart = (uint8_t*)(this->header.progClosuresAddr + slide);
-
- Diagnostics diag;
- const uint8_t* imageNode = dyld3::MachOLoaded::trieWalk(diag, executableTrieStart, executableTrieEnd, executablePath);
- if ( (imageNode == NULL) && (strncmp(executablePath, "/System/", 8) == 0) ) {
- // anything in /System/ should have a closure. Perhaps it was launched via symlink path
- char realPath[PATH_MAX];
- if ( realpath(executablePath, realPath) != NULL )
- imageNode = dyld3::MachOLoaded::trieWalk(diag, executableTrieStart, executableTrieEnd, realPath);
- }
- if ( imageNode != NULL ) {
- uint32_t closureOffset = (uint32_t)dyld3::MachOFile::read_uleb128(diag, imageNode, executableTrieEnd);
- if ( closureOffset < this->header.progClosuresSize )
- return (dyld3::closure::LaunchClosure*)((uint8_t*)closuresStart + closureOffset);
- }
-
- return nullptr;
-}
-
-#if !BUILDING_LIBDYLD && !BUILDING_DYLD
-void DyldSharedCache::forEachLaunchClosure(void (^handler)(const char* executableRuntimePath, const dyld3::closure::LaunchClosure* closure)) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- const uint8_t* executableTrieStart = (uint8_t*)(this->header.progClosuresTrieAddr + slide);
- const uint8_t* executableTrieEnd = executableTrieStart + this->header.progClosuresTrieSize;
- const uint8_t* closuresStart = (uint8_t*)(this->header.progClosuresAddr + slide);
-
- std::vector<DylibIndexTrie::Entry> closureEntries;
- if ( Trie<DylibIndex>::parseTrie(executableTrieStart, executableTrieEnd, closureEntries) ) {
- for (DylibIndexTrie::Entry& entry : closureEntries ) {
- uint32_t offset = entry.info.index;
- if ( offset < this->header.progClosuresSize )
- handler(entry.name.c_str(), (const dyld3::closure::LaunchClosure*)(closuresStart+offset));
- }
- }
-}
-
-void DyldSharedCache::forEachDlopenImage(void (^handler)(const char* runtimePath, const dyld3::closure::Image* image)) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- const uint8_t* otherTrieStart = (uint8_t*)(this->header.otherTrieAddr + slide);
- const uint8_t* otherTrieEnd = otherTrieStart + this->header.otherTrieSize;
-
- std::vector<DylibIndexTrie::Entry> otherEntries;
- if ( Trie<DylibIndex>::parseTrie(otherTrieStart, otherTrieEnd, otherEntries) ) {
- for (const DylibIndexTrie::Entry& entry : otherEntries ) {
- dyld3::closure::ImageNum imageNum = entry.info.index;
- uint64_t arrayAddrOffset = header.otherImageArrayAddr - mappings[0].address;
- const dyld3::closure::ImageArray* otherImageArray = (dyld3::closure::ImageArray*)((char*)this + arrayAddrOffset);
- handler(entry.name.c_str(), otherImageArray->imageForNum(imageNum));
- }
- }
-}
-
-void DyldSharedCache::forEachDylibPath(void (^handler)(const char* dylibPath, uint32_t index)) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- const uint8_t* dylibTrieStart = (uint8_t*)(this->header.dylibsTrieAddr + slide);
- const uint8_t* dylibTrieEnd = dylibTrieStart + this->header.dylibsTrieSize;
-
- std::vector<DylibIndexTrie::Entry> dylibEntries;
- if ( Trie<DylibIndex>::parseTrie(dylibTrieStart, dylibTrieEnd, dylibEntries) ) {
- for (DylibIndexTrie::Entry& entry : dylibEntries ) {
- handler(entry.name.c_str(), entry.info.index);
- }
- }
-}
-#endif // !BUILDING_LIBDYLD && !BUILDING_DYLD
-#endif // !BUILDING_LIBDSC
-
-const dyld3::closure::ImageArray* DyldSharedCache::cachedDylibsImageArray() const
-{
- // check for old cache without imagesArray
- if ( header.mappingOffset < 0x100 )
- return nullptr;
-
- if ( header.dylibsImageArrayAddr == 0 )
- return nullptr;
-
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uint64_t arrayAddrOffset = header.dylibsImageArrayAddr - mappings[0].address;
- return (dyld3::closure::ImageArray*)((char*)this + arrayAddrOffset);
-}
-
-const dyld3::closure::ImageArray* DyldSharedCache::otherOSImageArray() const
-{
- // check for old cache without imagesArray
- if ( header.mappingOffset < __offsetof(dyld_cache_header, otherImageArrayAddr) )
- return nullptr;
-
- if ( header.otherImageArrayAddr == 0 )
- return nullptr;
-
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uint64_t arrayAddrOffset = header.otherImageArrayAddr - mappings[0].address;
- return (dyld3::closure::ImageArray*)((char*)this + arrayAddrOffset);
-}
-
-
-uint32_t DyldSharedCache::patchableExportCount(uint32_t imageIndex) const {
- if ( header.patchInfoAddr == 0 )
- return 0;
-
- const dyld_cache_patch_info* patchInfo = getAddrField<dyld_cache_patch_info*>(header.patchInfoAddr);
- const dyld_cache_image_patches* patchArray = getAddrField<dyld_cache_image_patches*>(patchInfo->patchTableArrayAddr);
- if (imageIndex > patchInfo->patchTableArrayCount)
- return 0;
- return patchArray[imageIndex].patchExportsCount;
-}
-
-void DyldSharedCache::forEachPatchableExport(uint32_t imageIndex, void (^handler)(uint32_t cacheOffsetOfImpl, const char* exportName)) const {
- if ( header.patchInfoAddr == 0 )
- return;
-
- const dyld_cache_patch_info* patchInfo = getAddrField<dyld_cache_patch_info*>(header.patchInfoAddr);
- const dyld_cache_image_patches* patchArray = getAddrField<dyld_cache_image_patches*>(patchInfo->patchTableArrayAddr);
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
- const dyld_cache_image_patches& patch = patchArray[imageIndex];
- if ( (patch.patchExportsStartIndex + patch.patchExportsCount) > patchInfo->patchExportArrayCount )
- return;
- const dyld_cache_patchable_export* patchExports = getAddrField<dyld_cache_patchable_export*>(patchInfo->patchExportArrayAddr);
- const char* exportNames = getAddrField<char*>(patchInfo->patchExportNamesAddr);
- for (uint64_t exportIndex = 0; exportIndex != patch.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export& patchExport = patchExports[patch.patchExportsStartIndex + exportIndex];
- const char* exportName = ( patchExport.exportNameOffset < patchInfo->patchExportNamesSize ) ? &exportNames[patchExport.exportNameOffset] : "";
- handler(patchExport.cacheOffsetOfImpl, exportName);
- }
-}
-
-void DyldSharedCache::forEachPatchableUseOfExport(uint32_t imageIndex, uint32_t cacheOffsetOfImpl,
- void (^handler)(dyld_cache_patchable_location patchLocation)) const {
- if ( header.patchInfoAddr == 0 )
- return;
-
- // Loading a new cache so get the data from the cache header
- const dyld_cache_patch_info* patchInfo = getAddrField<dyld_cache_patch_info*>(header.patchInfoAddr);
- const dyld_cache_image_patches* patchArray = getAddrField<dyld_cache_image_patches*>(patchInfo->patchTableArrayAddr);
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
- const dyld_cache_image_patches& patch = patchArray[imageIndex];
- if ( (patch.patchExportsStartIndex + patch.patchExportsCount) > patchInfo->patchExportArrayCount )
- return;
- const dyld_cache_patchable_export* patchExports = getAddrField<dyld_cache_patchable_export*>(patchInfo->patchExportArrayAddr);
- const dyld_cache_patchable_location* patchLocations = getAddrField<dyld_cache_patchable_location*>(patchInfo->patchLocationArrayAddr);
- for (uint64_t exportIndex = 0; exportIndex != patch.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export& patchExport = patchExports[patch.patchExportsStartIndex + exportIndex];
- if ( patchExport.cacheOffsetOfImpl != cacheOffsetOfImpl )
- continue;
- if ( (patchExport.patchLocationsStartIndex + patchExport.patchLocationsCount) > patchInfo->patchLocationArrayCount )
- return;
- for (uint64_t locationIndex = 0; locationIndex != patchExport.patchLocationsCount; ++locationIndex) {
- const dyld_cache_patchable_location& patchLocation = patchLocations[patchExport.patchLocationsStartIndex + locationIndex];
- handler(patchLocation);
- }
- }
-}
-
-#if (BUILDING_LIBDYLD || BUILDING_DYLD)
-void DyldSharedCache::changeDataConstPermissions(mach_port_t machTask, uint32_t permissions,
- DataConstLogFunc logFunc) const {
-
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
-
- if ( (permissions & VM_PROT_WRITE) != 0 )
- permissions |= VM_PROT_COPY;
-
- forEachRegion(^(const void *, uint64_t vmAddr, uint64_t size,
- uint32_t initProt, uint32_t maxProt, uint64_t flags) {
- void* content = (void*)(vmAddr + slide);
- if ( ( flags & DYLD_CACHE_MAPPING_CONST_DATA) == 0 )
- return;
- if ( logFunc != nullptr ) {
- logFunc("dyld: marking shared cache range 0x%x permissions: 0x%09lX -> 0x%09lX\n",
- permissions, (long)content, (long)content + size);
- }
- kern_return_t result = vm_protect(machTask, (vm_address_t)content, (vm_size_t)size, false, permissions);
- if ( result != KERN_SUCCESS ) {
- if ( logFunc != nullptr )
- logFunc("dyld: failed to mprotect shared cache due to: %d\n", result);
- }
- });
-}
-
-DyldSharedCache::DataConstLazyScopedWriter::DataConstLazyScopedWriter(const DyldSharedCache* cache, mach_port_t machTask, DataConstLogFunc logFunc)
- : cache(cache), machTask(machTask), logFunc(logFunc) {
-}
-
-DyldSharedCache::DataConstLazyScopedWriter::~DataConstLazyScopedWriter() {
- if ( wasMadeWritable )
- cache->changeDataConstPermissions(machTask, VM_PROT_READ, logFunc);
-}
-
-void DyldSharedCache::DataConstLazyScopedWriter::makeWriteable() {
- if ( wasMadeWritable )
- return;
- if ( !gEnableSharedCacheDataConst )
- return;
- if ( cache == nullptr )
- return;
- wasMadeWritable = true;
- cache->changeDataConstPermissions(machTask, VM_PROT_READ | VM_PROT_WRITE, logFunc);
-}
-
-DyldSharedCache::DataConstScopedWriter::DataConstScopedWriter(const DyldSharedCache* cache, mach_port_t machTask, DataConstLogFunc logFunc)
- : writer(cache, machTask, logFunc) {
- writer.makeWriteable();
-}
-#endif
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-// MRM map file generator
-std::string DyldSharedCache::generateJSONMap(const char* disposition) const {
- dyld3::json::Node cacheNode;
-
- cacheNode.map["version"].value = "1";
- cacheNode.map["disposition"].value = disposition;
- cacheNode.map["base-address"].value = dyld3::json::hex(unslidLoadAddress());
- uuid_t cache_uuid;
- getUUID(cache_uuid);
- uuid_string_t cache_uuidStr;
- uuid_unparse(cache_uuid, cache_uuidStr);
- cacheNode.map["uuid"].value = cache_uuidStr;
-
- __block dyld3::json::Node imagesNode;
- forEachImage(^(const mach_header *mh, const char *installName) {
- dyld3::json::Node imageNode;
- imageNode.map["path"].value = installName;
- dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh;
- uuid_t uuid;
- if (ma->getUuid(uuid)) {
- uuid_string_t uuidStr;
- uuid_unparse(uuid, uuidStr);
- imageNode.map["uuid"].value = uuidStr;
- }
-
- __block dyld3::json::Node segmentsNode;
- ma->forEachSegment(^(const dyld3::MachOAnalyzer::SegmentInfo &info, bool &stop) {
- dyld3::json::Node segmentNode;
- segmentNode.map["name"].value = info.segName;
- segmentNode.map["start-vmaddr"].value = dyld3::json::hex(info.vmAddr);
- segmentNode.map["end-vmaddr"].value = dyld3::json::hex(info.vmAddr + info.vmSize);
- segmentsNode.array.push_back(segmentNode);
- });
- imageNode.map["segments"] = segmentsNode;
- imagesNode.array.push_back(imageNode);
- });
-
- cacheNode.map["images"] = imagesNode;
-
- std::stringstream stream;
- printJSON(cacheNode, 0, stream);
-
- return stream.str();
-}
-
-std::string DyldSharedCache::generateJSONDependents() const {
- std::unordered_map<std::string, std::set<std::string>> dependents;
- computeTransitiveDependents(dependents);
-
- std::stringstream stream;
-
- stream << "{";
- bool first = true;
- for (auto p : dependents) {
- if (!first) stream << "," << std::endl;
- first = false;
-
- stream << "\"" << p.first << "\" : [" << std::endl;
- bool firstDependent = true;
- for (const std::string & dependent : p.second) {
- if (!firstDependent) stream << "," << std::endl;
- firstDependent = false;
- stream << " \"" << dependent << "\"";
- }
- stream << "]" << std::endl;
- }
- stream << "}" << std::endl;
- return stream.str();
-}
-
-#endif
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-dyld3::MachOAnalyzer::VMAddrConverter DyldSharedCache::makeVMAddrConverter(bool contentRebased) const {
- typedef dyld3::MachOAnalyzer::VMAddrConverter VMAddrConverter;
-
- __block VMAddrConverter::SharedCacheFormat pointerFormat = VMAddrConverter::SharedCacheFormat::none;
- __block uint64_t pointerValueAdd = 0;;
- forEachSlideInfo(^(uint64_t mappingStartAddress, uint64_t mappingSize, const uint8_t *mappingPagesStart, uint64_t slideInfoOffset, uint64_t slideInfoSize, const dyld_cache_slide_info *slideInfoHeader) {
- assert(slideInfoHeader->version >= 2);
- if ( slideInfoHeader->version == 2 ) {
- const dyld_cache_slide_info2* slideInfo = (dyld_cache_slide_info2*)(slideInfoHeader);
- assert(slideInfo->delta_mask == 0x00FFFF0000000000);
- pointerFormat = VMAddrConverter::SharedCacheFormat::v2_x86_64_tbi;
- pointerValueAdd = slideInfo->value_add;
- } else if ( slideInfoHeader->version == 3 ) {
- pointerFormat = VMAddrConverter::SharedCacheFormat::v3;
- pointerValueAdd = unslidLoadAddress();
- } else {
- assert(false);
- }
- });
-
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
-
- VMAddrConverter vmAddrConverter;
- vmAddrConverter.preferredLoadAddress = pointerValueAdd;
- vmAddrConverter.slide = slide;
- vmAddrConverter.chainedPointerFormat = 0;
- vmAddrConverter.sharedCacheChainedPointerFormat = pointerFormat;
- vmAddrConverter.contentRebased = contentRebased;
-
- return vmAddrConverter;
-}
-#endif
-
-const dyld_cache_slide_info* DyldSharedCache::legacyCacheSlideInfo() const
-{
- assert(header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset));
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
-
- uint64_t offsetInLinkEditRegion = (header.slideInfoOffsetUnused - mappings[2].fileOffset);
- return (dyld_cache_slide_info*)((uint8_t*)(mappings[2].address) + slide + offsetInLinkEditRegion);
-}
-
-const dyld_cache_mapping_info* DyldSharedCache::legacyCacheDataRegionMapping() const
-{
- assert(header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset));
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- return &mappings[1];
-}
-
-const uint8_t* DyldSharedCache::legacyCacheDataRegionBuffer() const
-{
- assert(header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset));
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
-
- return (uint8_t*)(legacyCacheDataRegionMapping()->address) + slide;
-}
-
-#if !BUILDING_LIBDSC
-const objc_opt::objc_opt_t* DyldSharedCache::objcOpt() const {
- // Find the objc image
- const dyld3::MachOAnalyzer* objcMA = nullptr;
-
- uint32_t imageIndex;
- if ( hasImagePath("/usr/lib/libobjc.A.dylib", imageIndex) ) {
- const dyld3::closure::ImageArray* images = cachedDylibsImageArray();
- const dyld3::closure::Image* image = images->imageForNum(imageIndex+1);
- objcMA = (const dyld3::MachOAnalyzer*)((uintptr_t)this + image->cacheOffset());
- } else {
- return nullptr;
- }
-
- // If we found the objc image, then try to find the read-only data inside.
- __block const uint8_t* objcROContent = nullptr;
- int64_t slide = objcMA->getSlide();
- objcMA->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo& info, bool malformedSectionRange, bool& stop) {
- if (strcmp(info.segInfo.segName, "__TEXT") != 0)
- return;
- if (strcmp(info.sectName, "__objc_opt_ro") != 0)
- return;
- if ( malformedSectionRange ) {
- stop = true;
- return;
- }
- objcROContent = (uint8_t*)(info.sectAddr + slide);
- });
-
- if (objcROContent == nullptr)
- return nullptr;
-
- const objc_opt::objc_opt_t* optObjCHeader = (const objc_opt::objc_opt_t*)objcROContent;
- return optObjCHeader->version == objc_opt::VERSION ? optObjCHeader : nullptr;
-}
-
-const void* DyldSharedCache::objcOptPtrs() const {
- // Find the objc image
- const dyld3::MachOAnalyzer* objcMA = nullptr;
-
- uint32_t imageIndex;
- if ( hasImagePath("/usr/lib/libobjc.A.dylib", imageIndex) ) {
- const dyld3::closure::ImageArray* images = cachedDylibsImageArray();
- const dyld3::closure::Image* image = images->imageForNum(imageIndex+1);
- objcMA = (const dyld3::MachOAnalyzer*)((uintptr_t)this + image->cacheOffset());
- } else {
- return nullptr;
- }
-
- // If we found the objc image, then try to find the read-only data inside.
- __block const void* objcPointersContent = nullptr;
- int64_t slide = objcMA->getSlide();
- uint32_t pointerSize = objcMA->pointerSize();
- objcMA->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo& info, bool malformedSectionRange, bool& stop) {
- if ( (strncmp(info.segInfo.segName, "__DATA", 6) != 0) && (strncmp(info.segInfo.segName, "__AUTH", 6) != 0) )
- return;
- if (strcmp(info.sectName, "__objc_opt_ptrs") != 0)
- return;
- if ( info.sectSize != pointerSize ) {
- stop = true;
- return;
- }
- if ( malformedSectionRange ) {
- stop = true;
- return;
- }
- objcPointersContent = (uint8_t*)(info.sectAddr + slide);
- });
-
- return objcPointersContent;
-}
-#endif
-
-std::pair<const void*, uint64_t> DyldSharedCache::getObjCConstantRange() const {
- const dyld3::MachOAnalyzer* libDyldMA = nullptr;
- uint32_t imageIndex;
- if ( hasImagePath("/usr/lib/system/libdyld.dylib", imageIndex) ) {
- const dyld3::closure::ImageArray* images = cachedDylibsImageArray();
- const dyld3::closure::Image* image = images->imageForNum(imageIndex+1);
- libDyldMA = (const dyld3::MachOAnalyzer*)((uintptr_t)this + image->cacheOffset());
-
- std::pair<const void*, uint64_t> ranges = { nullptr, 0 };
-#if TARGET_OS_OSX
- ranges.first = libDyldMA->findSectionContent("__DATA", "__objc_ranges", ranges.second);
-#else
- ranges.first = libDyldMA->findSectionContent("__DATA_CONST", "__objc_ranges", ranges.second);
-#endif
- return ranges;
- }
-
- return { nullptr, 0 };
-}
-
-bool DyldSharedCache::hasSlideInfo() const {
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset) ) {
- return header.slideInfoSizeUnused != 0;
- } else {
- const dyld_cache_mapping_and_slide_info* slidableMappings = (const dyld_cache_mapping_and_slide_info*)((char*)this + header.mappingWithSlideOffset);
- for (uint32_t i = 0; i != header.mappingWithSlideCount; ++i) {
- if ( slidableMappings[i].slideInfoFileSize != 0 ) {
- return true;
- }
- }
- }
- return false;
-}
-
-void DyldSharedCache::forEachSlideInfo(void (^handler)(uint64_t mappingStartAddress, uint64_t mappingSize,
- const uint8_t* mappingPagesStart,
- uint64_t slideInfoOffset, uint64_t slideInfoSize,
- const dyld_cache_slide_info* slideInfoHeader)) const {
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset) ) {
- // Old caches should get the slide info from the cache header and assume a single data region.
- const dyld_cache_mapping_info* dataMapping = legacyCacheDataRegionMapping();
- uint64_t dataStartAddress = dataMapping->address;
- uint64_t dataSize = dataMapping->size;
- const uint8_t* dataPagesStart = legacyCacheDataRegionBuffer();
- const dyld_cache_slide_info* slideInfoHeader = legacyCacheSlideInfo();
-
- handler(dataStartAddress, dataSize, dataPagesStart,
- header.slideInfoOffsetUnused, header.slideInfoSizeUnused, slideInfoHeader);
- } else {
- const dyld_cache_mapping_and_slide_info* slidableMappings = (const dyld_cache_mapping_and_slide_info*)((char*)this + header.mappingWithSlideOffset);
- const dyld_cache_mapping_and_slide_info* linkeditMapping = &slidableMappings[header.mappingWithSlideCount - 1];
- uint64_t sharedCacheSlide = (uint64_t)this - unslidLoadAddress();
-
- for (uint32_t i = 0; i != header.mappingWithSlideCount; ++i) {
- if ( slidableMappings[i].slideInfoFileOffset != 0 ) {
- // Get the data pages
- uint64_t dataStartAddress = slidableMappings[i].address;
- uint64_t dataSize = slidableMappings[i].size;
- const uint8_t* dataPagesStart = (uint8_t*)dataStartAddress + sharedCacheSlide;
-
- // Get the slide info
- uint64_t offsetInLinkEditRegion = (slidableMappings[i].slideInfoFileOffset - linkeditMapping->fileOffset);
- const dyld_cache_slide_info* slideInfoHeader = (dyld_cache_slide_info*)((uint8_t*)(linkeditMapping->address) + sharedCacheSlide + offsetInLinkEditRegion);
- handler(dataStartAddress, dataSize, dataPagesStart,
- slidableMappings[i].slideInfoFileOffset, slidableMappings[i].slideInfoFileSize, slideInfoHeader);
- }
- }
- }
-}
-
-#if BUILDING_LIBDYLD
-const char* DyldSharedCache::getCanonicalPath(const char *path) const {
- uint32_t dyldCacheImageIndex;
- if ( hasImagePath(path, dyldCacheImageIndex) )
- return getIndexedImagePath(dyldCacheImageIndex);
-#if TARGET_OS_OSX
- // on macOS support "Foo.framework/Foo" symlink
- char resolvedPath[PATH_MAX];
- realpath(path, resolvedPath);
- int realpathErrno = errno;
- // If realpath() resolves to a path which does not exist on disk, errno is set to ENOENT
- if ( (realpathErrno == ENOENT) || (realpathErrno == 0) ) {
- if ( hasImagePath(resolvedPath, dyldCacheImageIndex) )
- return getIndexedImagePath(dyldCacheImageIndex);
- }
-#endif
- return nullptr;
-}
-#endif
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-void DyldSharedCache::fillMachOAnalyzersMap(std::unordered_map<std::string,dyld3::MachOAnalyzer*> & dylibAnalyzers) const {
- forEachImage(^(const mach_header *mh, const char *iteratedInstallName) {
- dylibAnalyzers[std::string(iteratedInstallName)] = (dyld3::MachOAnalyzer*)mh;
- });
-}
-
-void DyldSharedCache::computeReverseDependencyMapForDylib(std::unordered_map<std::string, std::set<std::string>> &reverseDependencyMap, const std::unordered_map<std::string,dyld3::MachOAnalyzer*> & dylibAnalyzers, const std::string &loadPath) const {
- dyld3::MachOAnalyzer *ma = dylibAnalyzers.at(loadPath);
- if (reverseDependencyMap.find(loadPath) != reverseDependencyMap.end()) return;
- reverseDependencyMap[loadPath] = std::set<std::string>();
-
- ma->forEachDependentDylib(^(const char *dependencyLoadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool &stop) {
- if (isUpward) return;
- std::string dependencyLoadPathString = std::string(dependencyLoadPath);
- computeReverseDependencyMapForDylib(reverseDependencyMap, dylibAnalyzers, dependencyLoadPathString);
- reverseDependencyMap[dependencyLoadPathString].insert(loadPath);
- });
-}
-
-// Walks the shared cache and construct the reverse dependency graph (if dylib A depends on B,
-// constructs the graph with B -> A edges)
-void DyldSharedCache::computeReverseDependencyMap(std::unordered_map<std::string, std::set<std::string>> &reverseDependencyMap) const {
- std::unordered_map<std::string,dyld3::MachOAnalyzer*> dylibAnalyzers;
-
- fillMachOAnalyzersMap(dylibAnalyzers);
- forEachImage(^(const mach_header *mh, const char *installName) {
- computeReverseDependencyMapForDylib(reverseDependencyMap, dylibAnalyzers, std::string(installName));
- });
-}
-
-// uses the reverse dependency graph constructed above to find the recursive set of dependents for each dylib
-void DyldSharedCache::findDependentsRecursively(std::unordered_map<std::string, std::set<std::string>> &transitiveDependents, const std::unordered_map<std::string, std::set<std::string>> &reverseDependencyMap, std::set<std::string> & visited, const std::string &loadPath) const {
-
- if (transitiveDependents.find(loadPath) != transitiveDependents.end()) {
- return;
- }
-
- if (visited.find(loadPath) != visited.end()) {
- return;
- }
-
- visited.insert(loadPath);
-
- std::set<std::string> dependents;
-
- for (const std::string & dependent : reverseDependencyMap.at(loadPath)) {
- findDependentsRecursively(transitiveDependents, reverseDependencyMap, visited, dependent);
- if (transitiveDependents.find(dependent) != transitiveDependents.end()) {
- std::set<std::string> & theseTransitiveDependents = transitiveDependents.at(dependent);
- dependents.insert(theseTransitiveDependents.begin(), theseTransitiveDependents.end());
- }
- dependents.insert(dependent);
- }
-
- transitiveDependents[loadPath] = dependents;
-}
-
-// Fills a map from each install name N to the set of install names depending on N
-void DyldSharedCache::computeTransitiveDependents(std::unordered_map<std::string, std::set<std::string>> & transitiveDependents) const {
- std::unordered_map<std::string, std::set<std::string>> reverseDependencyMap;
- computeReverseDependencyMap(reverseDependencyMap);
- forEachImage(^(const mach_header *mh, const char *installName) {
- std::set<std::string> visited;
- findDependentsRecursively(transitiveDependents, reverseDependencyMap, visited, std::string(installName));
- });
-}
-#endif