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--- dyld/dyld-955/common/DyldSharedCache.cpp
+++ /dev/null
@@ -1,2235 +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/mman.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 "PrebuiltLoader.h"
-
-#include "objc-shared-cache.h"
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-#include "JSONWriter.h"
-#include <sstream>
-#endif
-
-using dyld4::PrebuiltLoader;
-using dyld4::PrebuiltLoaderSet;
-#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.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,
- bool& stopRegion)) 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) {
- bool stop = false;
- handler((char*)this + m->fileOffset, m->address, m->size, m->initProt, m->maxProt, 0, stop);
- if ( stop )
- return;
- }
- } 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) {
- bool stop = false;
- handler((char*)this + m->fileOffset, m->address, m->size, m->initProt, m->maxProt, m->flags, stop);
- if ( stop )
- return;
- }
- }
-}
-
-void DyldSharedCache::forEachRange(void (^handler)(const char* mappingName,
- uint64_t unslidVMAddr, uint64_t vmSize,
- uint32_t cacheFileIndex, uint64_t fileOffset,
- uint32_t initProt, uint32_t maxProt,
- bool& stopRange),
- void (^subCacheHandler)(const DyldSharedCache* subCache, uint32_t cacheFileIndex)) const
-{
- __block uint32_t cacheFileIndex = 0;
- forEachCache(^(const DyldSharedCache *cache, bool& stopCache) {
- cache->forEachRegion(^(const void *content, uint64_t unslidVMAddr, uint64_t size,
- uint32_t initProt, uint32_t maxProt, uint64_t flags, bool& stopRegion) {
- const char* mappingName = "";
- if ( maxProt & VM_PROT_EXECUTE ) {
- mappingName = "__TEXT";
- } else if ( maxProt & VM_PROT_WRITE ) {
- if ( flags & DYLD_CACHE_MAPPING_AUTH_DATA ) {
- if ( flags & DYLD_CACHE_MAPPING_DIRTY_DATA )
- mappingName = "__AUTH_DIRTY";
- else if ( flags & DYLD_CACHE_MAPPING_CONST_DATA )
- mappingName = "__AUTH_CONST";
- else
- mappingName = "__AUTH";
- } else {
- if ( flags & DYLD_CACHE_MAPPING_DIRTY_DATA )
- mappingName = "__DATA_DIRTY";
- else if ( flags & DYLD_CACHE_MAPPING_CONST_DATA )
- mappingName = "__DATA_CONST";
- else
- mappingName = "__DATA";
- }
- }
- else if ( maxProt & VM_PROT_READ ) {
- mappingName = "__LINKEDIT";
- } else {
- mappingName = "*unknown*";
- }
- uint64_t fileOffset = (uint8_t*)content - (uint8_t*)cache;
- bool stop = false;
- handler(mappingName, unslidVMAddr, size, cacheFileIndex, fileOffset, initProt, maxProt, stop);
- if ( stop ) {
- stopRegion = true;
- stopCache = true;
- return;
- }
- });
-
- if ( stopCache )
- return;
-
- if ( subCacheHandler != nullptr )
- subCacheHandler(cache, cacheFileIndex);
-
- ++cacheFileIndex;
- });
-}
-
-void DyldSharedCache::forEachCache(void (^handler)(const DyldSharedCache *cache, bool& stopCache)) const
-{
- // Always start with the current file
- bool stop = false;
- handler(this, stop);
- if ( stop )
- return;
-
- // We may or may not be followed by sub caches.
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, subCacheArrayCount) )
- return;
-
- const dyld_subcache_entry* subCaches = (const dyld_subcache_entry*)((uint8_t*)this + header.subCacheArrayOffset);
- for (uint32_t i = 0; i != header.subCacheArrayCount; ++i) {
- const DyldSharedCache* cache = (const DyldSharedCache*)((uint8_t*)this + subCaches[i].cacheVMOffset);
- handler(cache, stop);
- if ( stop )
- return;
- }
-}
-
-uint32_t DyldSharedCache::numSubCaches() const {
- // We may or may not be followed by sub caches.
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, subCacheArrayCount) )
- return 0;
-
- return header.subCacheArrayCount;
-}
-
-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);
-}
-
-uint32_t DyldSharedCache::imagesCount() const {
- if ( header.mappingOffset >= __offsetof(dyld_cache_header, imagesCount) ) {
- return header.imagesCount;
- }
- return header.imagesCountOld;
-}
-
-const dyld_cache_image_info* DyldSharedCache::images() const {
- if ( header.mappingOffset >= __offsetof(dyld_cache_header, imagesCount) ) {
- return (dyld_cache_image_info*)((char*)this + header.imagesOffset);
- }
- return (dyld_cache_image_info*)((char*)this + header.imagesOffsetOld);
-}
-
-void DyldSharedCache::forEachImage(void (^handler)(const mach_header* mh, const char* installName)) const
-{
- const dyld_cache_image_info* dylibs = images();
- 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 < 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. This is no longer valid in newer caches. They store aliases only in the trie
-#if 0
- if ( dylibs[i].pathFileOffset < firstImageOffset)
- continue;
-#endif
- const mach_header* mh = (mach_header*)((char*)this + offset);
- handler(mh, dylibPath);
- }
-}
-
-void DyldSharedCache::forEachDylib(void (^handler)(const dyld3::MachOAnalyzer* ma, const char* installName, uint32_t imageIndex, uint64_t inode, uint64_t mtime, bool& stop)) 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) {
- uint64_t offset = dylibs[i].address - firstRegionAddress;
- if ( firstImageOffset == 0 )
- firstImageOffset = offset;
- const char* dylibPath = (char*)this + dylibs[i].pathFileOffset;
- const mach_header* mh = (mach_header*)((char*)this + offset);
- bool stop = false;
- handler((const dyld3::MachOAnalyzer*)mh, dylibPath, i, dylibs[i].inode, dylibs[i].modTime, stop);
- if ( stop )
- break;
- }
-}
-
-void DyldSharedCache::forEachImageEntry(void (^handler)(const char* path, uint64_t mTime, uint64_t inode)) const
-{
- const dyld_cache_image_info* dylibs = images();
- 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 < 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. This is no longer valid in newer caches. They store aliases only in the trie
-#if 0
- if ( dylibs[i].pathFileOffset < firstImageOffset)
- continue;
-#endif
- 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 bool DyldSharedCache::hasLocalSymbolsInfoFile() const
-{
- if ( header.mappingOffset > __offsetof(dyld_cache_header, symbolFileUUID) )
- return !uuid_is_null(header.symbolFileUUID);
-
- // Old cache file
- return false;
-}
-
-const void* DyldSharedCache::getLocalNlistEntries(const dyld_cache_local_symbols_info* localInfo) {
- return (uint8_t*)localInfo + localInfo->nlistOffset;
-}
-
-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 getLocalNlistEntries(localInfo);
-}
-
-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 dyld_cache_local_symbols_info* localInfo)
-{
- return (char*)localInfo + localInfo->stringsOffset;
-}
-
-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 getLocalStrings(localInfo);
-}
-
-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;
-}
-
-const dyld3::MachOFile* DyldSharedCache::getImageFromPath(const char* dylibPath) const
-{
- const dyld_cache_image_info* dylibs = images();
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- uint32_t dyldCacheImageIndex;
- if ( hasImagePath(dylibPath, dyldCacheImageIndex) )
- return (dyld3::MachOFile*)((uint8_t*)this + dylibs[dyldCacheImageIndex].address - mappings[0].address);
- return nullptr;
-}
-
-void DyldSharedCache::forEachLocalSymbolEntry(void (^handler)(uint64_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);
-
- if ( header.mappingOffset >= __offsetof(dyld_cache_header, symbolFileUUID) ) {
- // On new caches, the dylibOffset is 64-bits, and is a VM offset
- const auto localEntries = (dyld_cache_local_symbols_entry_64*)((uint8_t*)localInfo + localInfo->entriesOffset);
- bool stop = false;
- for (uint32_t i = 0; i < localInfo->entriesCount; i++) {
- const dyld_cache_local_symbols_entry_64& localEntry = localEntries[i];
- handler(localEntry.dylibOffset, localEntry.nlistStartIndex, localEntry.nlistCount, stop);
- }
- } else {
- // On old caches, the dylibOffset is 64-bits, and is a file offset
- // Note, as we are only looking for mach_header's, a file offset is a VM offset in this case
- 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++) {
- const 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 = images();
- 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 = images();
- 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(uint64_t cacheOffset, uint32_t* imageIndex) const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- 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, bool& stopRegion) {
- 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
-{
- // If we have sub caches, then the cache header itself tells us how much space we need to cover all caches
- if ( header.mappingOffset >= __offsetof(dyld_cache_header, subCacheArrayCount) ) {
- return header.sharedRegionSize;
- } else {
- __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, bool& stopRegion) {
- 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 = images();
- for (uint32_t i=0; i < 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 = images();
- uint64_t firstImageOffset = 0;
- uint64_t firstRegionAddress = mappings[0].address;
- for (uint32_t i=0; i < 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. This is no longer valid in newer caches. They store aliases only in the trie
-#if 0
- if ( dylibs[i].pathFileOffset < firstImageOffset)
- continue;
-#endif
- }
- }
-
- 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;
-}
-
-intptr_t DyldSharedCache::slide() const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- return (intptr_t)this - (intptr_t)(mappings[0].address);
-}
-
-const PrebuiltLoader* DyldSharedCache::findPrebuiltLoader(const char* path) const
-{
- if ( header.mappingOffset < __offsetof(dyld_cache_header, programTrieSize) )
- return nullptr;
- uint32_t imageIndex;
- if ( !this->hasImagePath(path, imageIndex) )
- return nullptr;
- 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, dylibsPBLSetAddr) )
- return nullptr;
- if ( header.dylibsPBLSetAddr == 0 )
- return nullptr;
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- const PrebuiltLoaderSet* pbLoaderSet = (PrebuiltLoaderSet*)(this->header.dylibsPBLSetAddr + slide);
- return pbLoaderSet->atIndex(imageIndex);
-}
-
-void DyldSharedCache::forEachLaunchLoaderSet(void (^handler)(const char* executableRuntimePath, const PrebuiltLoaderSet* pbls)) const
-{
- if ( header.mappingOffset < __offsetof(dyld_cache_header, programTrieSize) )
- return;
- if ( this->header.programTrieAddr == 0 )
- return;
- 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.programTrieAddr + slide);
- const uint8_t* executableTrieEnd = executableTrieStart + this->header.programTrieSize;
- const uint8_t* poolStart = (uint8_t*)(this->header.programsPBLSetPoolAddr + slide);
-
- std::vector<DylibIndexTrie::Entry> loaderSetEntries;
- if ( Trie<DylibIndex>::parseTrie(executableTrieStart, executableTrieEnd, loaderSetEntries) ) {
- for (const DylibIndexTrie::Entry& entry : loaderSetEntries ) {
- uint32_t offset = entry.info.index;
- if ( offset < this->header.programsPBLSetPoolSize )
- handler(entry.name.c_str(), (const PrebuiltLoaderSet*)(poolStart+offset));
- }
- }
-}
-
-const PrebuiltLoaderSet* DyldSharedCache::findLaunchLoaderSet(const char* executablePath) const
-{
- if ( header.mappingOffset < __offsetof(dyld_cache_header, programTrieSize) )
- return nullptr;
- if ( this->header.programTrieAddr == 0 )
- return nullptr;
- 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.programTrieAddr + slide);
- const uint8_t* executableTrieEnd = executableTrieStart + this->header.programTrieSize;
- const uint8_t* poolStart = (uint8_t*)(this->header.programsPBLSetPoolAddr + slide);
-
- Diagnostics diag;
- if ( const uint8_t* imageNode = dyld3::MachOLoaded::trieWalk(diag, executableTrieStart, executableTrieEnd, executablePath) ) {
- uint32_t poolOffset = (uint32_t)dyld3::MachOFile::read_uleb128(diag, imageNode, executableTrieEnd);
- if ( poolOffset < this->header.programsPBLSetPoolSize ) {
- return (PrebuiltLoaderSet*)((uint8_t*)poolStart + poolOffset);
- }
- }
-
- return nullptr;
-}
-
-bool DyldSharedCache::hasLaunchLoaderSetWithCDHash(const char* cdHashString) const
-{
- if ( cdHashString == nullptr )
- return false;
-
- // Check source doesn't overflow buffer. strncat unfortunately isn't available
- if ( strlen(cdHashString) >= 128 )
- return false;
-
- char buffer[128] = { '\0' };
- strcat(buffer, "/cdhash/");
- strlcat(buffer, cdHashString, sizeof(buffer));
- return findLaunchLoaderSet(buffer) != nullptr;
-}
-
-
-#if 0 //!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));
- }
- }
-}
-#endif // !BUILDING_LIBDYLD && !BUILDING_DYLD
-
-
-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);
-}
-#endif // !BUILDING_LIBDSC
-
-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);
- }
- }
-}
-
-uint32_t DyldSharedCache::patchInfoVersion() const {
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, swiftOptsSize) ) {
- return 1;
- }
-
- const dyld_cache_patch_info_v2* patchInfo = getAddrField<dyld_cache_patch_info_v2*>(header.patchInfoAddr);
- return patchInfo->patchTableVersion;
-}
-
-uint32_t DyldSharedCache::patchableExportCount(uint32_t imageIndex) const {
- if ( header.patchInfoAddr == 0 )
- return 0;
-
- uint32_t patchVersion = patchInfoVersion();
-
- if ( patchVersion == 1 ) {
- // Old cache. The patch table uses the V1 structs
-
- const dyld_cache_patch_info_v1* patchInfo = getAddrField<dyld_cache_patch_info_v1*>(header.patchInfoAddr);
- const dyld_cache_image_patches_v1* patchArray = getAddrField<dyld_cache_image_patches_v1*>(patchInfo->patchTableArrayAddr);
- if (imageIndex > patchInfo->patchTableArrayCount)
- return 0;
- return patchArray[imageIndex].patchExportsCount;
- }
-
- // V2 and newer structs
- if ( patchVersion == 2 ) {
- const dyld_cache_patch_info_v2* patchInfo = getAddrField<dyld_cache_patch_info_v2*>(header.patchInfoAddr);
- const dyld_cache_image_patches_v2* patchArray = getAddrField<dyld_cache_image_patches_v2*>(patchInfo->patchTableArrayAddr);
-
- // FIXME: This shouldn't be possible. The cache builder always adds 1 dyld_cache_image_patches_v2 per-image. But for now
- // be conservative to match V1.
- if (imageIndex > patchInfo->patchTableArrayCount)
- return 0;
-
- const dyld_cache_image_patches_v2& imagePatches = patchArray[imageIndex];
- return imagePatches.patchExportsCount;
- }
-
- // Unknown version
- assert(false);
-}
-
-void DyldSharedCache::forEachPatchableExport(uint32_t imageIndex, void (^handler)(uint32_t dylibVMOffsetOfImpl, const char* exportName)) const {
- if ( header.patchInfoAddr == 0 )
- return;
-
- uint32_t patchVersion = patchInfoVersion();
-
- if ( patchVersion == 1 ) {
- // Old cache. The patch table uses the V1 structs
-
- // This patch table uses cache offsets, so convert from cache offset to "image + offset"
- uint64_t mTime;
- uint64_t inode;
- const dyld3::MachOAnalyzer* imageMA = (dyld3::MachOAnalyzer*)(this->getIndexedImageEntry(imageIndex, mTime, inode));
- if ( imageMA == nullptr )
- return;
-
- uint64_t imageLoadAddress = imageMA->preferredLoadAddress();
- uint64_t cacheUnslidAddress = unslidLoadAddress();
-
- const dyld_cache_patch_info_v1* patchInfo = getAddrField<dyld_cache_patch_info_v1*>(header.patchInfoAddr);
- const dyld_cache_image_patches_v1* patchArray = getAddrField<dyld_cache_image_patches_v1*>(patchInfo->patchTableArrayAddr);
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
- const dyld_cache_image_patches_v1& patch = patchArray[imageIndex];
- if ( (patch.patchExportsStartIndex + patch.patchExportsCount) > patchInfo->patchExportArrayCount )
- return;
- const dyld_cache_patchable_export_v1* patchExports = getAddrField<dyld_cache_patchable_export_v1*>(patchInfo->patchExportArrayAddr);
- const char* exportNames = getAddrField<char*>(patchInfo->patchExportNamesAddr);
- for (uint64_t exportIndex = 0; exportIndex != patch.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export_v1& patchExport = patchExports[patch.patchExportsStartIndex + exportIndex];
- const char* exportName = ( patchExport.exportNameOffset < patchInfo->patchExportNamesSize ) ? &exportNames[patchExport.exportNameOffset] : "";
-
- // Convert from a cache offset to an offset from the input image
- uint32_t imageOffset = (uint32_t)((cacheUnslidAddress + patchExport.cacheOffsetOfImpl) - imageLoadAddress);
- handler(imageOffset, exportName);
- }
-
- return;
- }
-
- // V2 and newer structs
- if ( patchVersion == 2 ) {
- const auto* patchInfo = getAddrField<dyld_cache_patch_info_v2*>(header.patchInfoAddr);
- const auto* patchArray = getAddrField<dyld_cache_image_patches_v2*>(patchInfo->patchTableArrayAddr);
- const auto* imageExports = getAddrField<dyld_cache_image_export_v2*>(patchInfo->patchImageExportsArrayAddr);
- const char* exportNames = getAddrField<char*>(patchInfo->patchExportNamesAddr);
-
- // FIXME: This shouldn't be possible. The cache builder always adds 1 dyld_cache_image_patches_v2 per-image. But for now
- // be conservative to match V1.
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
-
- const dyld_cache_image_patches_v2& imagePatches = patchArray[imageIndex];
- // FIXME: This shouldn't be possible. We should catch this in the builder instead
- if ( (imagePatches.patchExportsStartIndex + imagePatches.patchExportsCount) > patchInfo->patchImageExportsArrayCount )
- return;
-
- for (uint64_t exportIndex = 0; exportIndex != imagePatches.patchExportsCount; ++exportIndex) {
- const dyld_cache_image_export_v2& imageExport = imageExports[imagePatches.patchExportsStartIndex + exportIndex];
- const char* exportName = ( imageExport.exportNameOffset < patchInfo->patchExportNamesSize ) ? &exportNames[imageExport.exportNameOffset] : "";
- handler(imageExport.dylibOffsetOfImpl, exportName);
- }
- return;
- }
-
- assert(false);
-}
-
-void DyldSharedCache::forEachPatchableUseOfExport(uint32_t imageIndex, uint32_t dylibVMOffsetOfImpl,
- void (^handler)(uint32_t userImageIndex, uint32_t userVMOffset,
- MachOLoaded::PointerMetaData pmd, uint64_t addend)) const {
- if ( header.patchInfoAddr == 0 )
- return;
-
- uint32_t patchVersion = patchInfoVersion();
-
- if ( patchVersion == 1 ) {
- // Old cache. The patch table uses the V1 structs
-
- // This patch table uses cache offsets, so convert from "image + offset" to cache offset
- uint64_t mTime;
- uint64_t inode;
- const dyld3::MachOAnalyzer* imageMA = (dyld3::MachOAnalyzer*)(this->getIndexedImageEntry(imageIndex, mTime, inode));
- if ( imageMA == nullptr )
- return;
-
- uint64_t cacheUnslidAddress = unslidLoadAddress();
- uint32_t cacheOffsetOfImpl = (uint32_t)((imageMA->preferredLoadAddress() - cacheUnslidAddress) + dylibVMOffsetOfImpl);
-
- // Loading a new cache so get the data from the cache header
- const dyld_cache_patch_info_v1* patchInfo = getAddrField<dyld_cache_patch_info_v1*>(header.patchInfoAddr);
- const dyld_cache_image_patches_v1* patchArray = getAddrField<dyld_cache_image_patches_v1*>(patchInfo->patchTableArrayAddr);
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
- const dyld_cache_image_patches_v1& patch = patchArray[imageIndex];
- if ( (patch.patchExportsStartIndex + patch.patchExportsCount) > patchInfo->patchExportArrayCount )
- return;
-
- // V1 doesn't know which patch location corresponds to which dylib. This is expensive, but temporary, so find the dylib for
- // each patch
- struct DataRange
- {
- uint64_t cacheOffsetStart;
- uint64_t cacheOffsetEnd;
- };
- STACK_ALLOC_OVERFLOW_SAFE_ARRAY(DataRange, dataRanges, 8);
- __block const dyld3::MachOAnalyzer* userDylib = nullptr;
- __block uint32_t userImageIndex = ~0U;
-
- const dyld_cache_patchable_export_v1* patchExports = getAddrField<dyld_cache_patchable_export_v1*>(patchInfo->patchExportArrayAddr);
- const dyld_cache_patchable_location_v1* patchLocations = getAddrField<dyld_cache_patchable_location_v1*>(patchInfo->patchLocationArrayAddr);
- for (uint64_t exportIndex = 0; exportIndex != patch.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export_v1& 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_v1& patchLocation = patchLocations[patchExport.patchLocationsStartIndex + locationIndex];
-
- bool computeNewRanges = false;
- if ( userDylib == nullptr ) {
- computeNewRanges = true;
- } else {
- bool inRange = false;
- for ( const DataRange& range : dataRanges ) {
- if ( (patchLocation.cacheOffset >= range.cacheOffsetStart) && (patchLocation.cacheOffset < range.cacheOffsetEnd) ) {
- inRange = true;
- break;
- }
- }
- if ( !inRange )
- computeNewRanges = true;
- }
-
- if ( computeNewRanges ) {
- userDylib = nullptr;
- userImageIndex = ~0U;
- dataRanges.clear();
- forEachDylib(^(const dyld3::MachOAnalyzer* ma, const char* dylibPath, uint32_t cacheImageIndex, uint64_t, uint64_t, bool& stopImage) {
- ma->forEachSegment(^(const MachOAnalyzer::SegmentInfo& info, bool& stopSegment) {
- if ( info.writable() )
- dataRanges.push_back({ info.vmAddr - cacheUnslidAddress, info.vmAddr + info.vmSize - cacheUnslidAddress });
- });
-
- bool inRange = false;
- for ( const DataRange& range : dataRanges ) {
- if ( (patchLocation.cacheOffset >= range.cacheOffsetStart) && (patchLocation.cacheOffset < range.cacheOffsetEnd) ) {
- inRange = true;
- break;
- }
- }
- if ( inRange ) {
- // This is dylib we want. So we can keep these ranges, and record this mach-header
- userDylib = ma;
- userImageIndex = cacheImageIndex;
- stopImage = true;
- } else {
- // These ranges don't work. Clear them and move on to the next dylib
- dataRanges.clear();
- }
- });
- }
-
- assert(userDylib != nullptr);
- assert(userImageIndex != ~0U);
- assert(!dataRanges.empty());
-
- uint32_t userVMOffset = (uint32_t)((cacheUnslidAddress + patchLocation.cacheOffset) - userDylib->preferredLoadAddress());
- dyld3::MachOLoaded::PointerMetaData pmd;
- pmd.diversity = patchLocation.discriminator;
- pmd.high8 = patchLocation.high7 << 1;
- pmd.authenticated = patchLocation.authenticated;
- pmd.key = patchLocation.key;
- pmd.usesAddrDiversity = patchLocation.usesAddressDiversity;
-
- handler(userImageIndex, userVMOffset, pmd, patchLocation.getAddend());
- }
- }
- return;
- }
-
- // V2 and newer structs
- if ( patchVersion == 2 ) {
- const auto* patchInfo = getAddrField<dyld_cache_patch_info_v2*>(header.patchInfoAddr);
- const auto* patchArray = getAddrField<dyld_cache_image_patches_v2*>(patchInfo->patchTableArrayAddr);
- const auto* imageExports = getAddrField<dyld_cache_image_export_v2*>(patchInfo->patchImageExportsArrayAddr);
- const auto* clientArray = getAddrField<dyld_cache_image_clients_v2*>(patchInfo->patchClientsArrayAddr);
- const auto* clientExports = getAddrField<dyld_cache_patchable_export_v2*>(patchInfo->patchClientExportsArrayAddr);
- const auto* patchLocations = getAddrField<dyld_cache_patchable_location_v2*>(patchInfo->patchLocationArrayAddr);
-
- // FIXME: This shouldn't be possible. The cache builder always adds 1 dyld_cache_image_patches_v2 per-image. But for now
- // be conservative to match V1.
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
-
- const dyld_cache_image_patches_v2& imagePatches = patchArray[imageIndex];
- // FIXME: This shouldn't be possible. We should catch this in the builder instead
- if ( (imagePatches.patchClientsStartIndex + imagePatches.patchClientsCount) > patchInfo->patchClientsArrayCount )
- return;
-
- for (uint64_t clientIndex = 0; clientIndex != imagePatches.patchClientsCount; ++clientIndex) {
- const dyld_cache_image_clients_v2& client = clientArray[imagePatches.patchClientsStartIndex + clientIndex];
-
- // FIXME: This shouldn't be possible. We should catch this in the builder instead
- if ( (client.patchExportsStartIndex + client.patchExportsCount) > patchInfo->patchClientExportsArrayCount )
- return;
-
- for (uint64_t exportIndex = 0; exportIndex != client.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export_v2& clientExport = clientExports[client.patchExportsStartIndex + exportIndex];
-
- // The client export points to an image export from the image we are rooting
- if ( clientExport.imageExportIndex > patchInfo->patchImageExportsArrayCount )
- return;
-
- const dyld_cache_image_export_v2& imageExport = imageExports[clientExport.imageExportIndex];
-
- if ( imageExport.dylibOffsetOfImpl != dylibVMOffsetOfImpl )
- continue;
-
- if ( (clientExport.patchLocationsStartIndex + clientExport.patchLocationsCount) > patchInfo->patchLocationArrayCount )
- return;
-
- for (uint64_t locationIndex = 0; locationIndex != clientExport.patchLocationsCount; ++locationIndex) {
- const dyld_cache_patchable_location_v2& patchLocation = patchLocations[clientExport.patchLocationsStartIndex + locationIndex];
-
- dyld3::MachOLoaded::PointerMetaData pmd;
- pmd.diversity = patchLocation.discriminator;
- pmd.high8 = patchLocation.high7 << 1;
- pmd.authenticated = patchLocation.authenticated;
- pmd.key = patchLocation.key;
- pmd.usesAddrDiversity = patchLocation.usesAddressDiversity;
-
- handler(client.clientDylibIndex, patchLocation.dylibOffsetOfUse, pmd, patchLocation.getAddend());
- }
- }
- }
- return;
- }
-
- assert(false);
-}
-
-bool DyldSharedCache::shouldPatchClientOfImage(uint32_t imageIndex, uint32_t userImageIndex) const {
- if ( header.patchInfoAddr == 0 )
- return false;
-
- uint32_t patchVersion = patchInfoVersion();
-
- if ( patchVersion == 1 ) {
- // Old cache. The patch table uses the V1 structs
- // Only dyld uses this method and is on at least v2, so we don't implement this
- return false;
- }
-
- // V2 and newer structs
- if ( patchVersion == 2 ) {
- const auto* patchInfo = getAddrField<dyld_cache_patch_info_v2*>(header.patchInfoAddr);
- const auto* patchArray = getAddrField<dyld_cache_image_patches_v2*>(patchInfo->patchTableArrayAddr);
- const auto* clientArray = getAddrField<dyld_cache_image_clients_v2*>(patchInfo->patchClientsArrayAddr);
-
- // FIXME: This shouldn't be possible. The cache builder always adds 1 dyld_cache_image_patches_v2 per-image. But for now
- // be conservative to match V1.
- if (imageIndex > patchInfo->patchTableArrayCount)
- return false;
-
- const dyld_cache_image_patches_v2& imagePatches = patchArray[imageIndex];
- // FIXME: This shouldn't be possible. We should catch this in the builder instead
- if ( (imagePatches.patchClientsStartIndex + imagePatches.patchClientsCount) > patchInfo->patchClientsArrayCount )
- return false;
-
- for (uint64_t clientIndex = 0; clientIndex != imagePatches.patchClientsCount; ++clientIndex) {
- const dyld_cache_image_clients_v2& client = clientArray[imagePatches.patchClientsStartIndex + clientIndex];
-
- // We only want fixups in a specific image. Skip any others
- if ( client.clientDylibIndex == userImageIndex )
- return true;
- }
- return false;
- }
-
- assert(false);
-}
-
-void DyldSharedCache::forEachPatchableUseOfExportInImage(uint32_t imageIndex, uint32_t dylibVMOffsetOfImpl, uint32_t userImageIndex,
- void (^handler)(uint32_t userVMOffset, MachOLoaded::PointerMetaData pmd, uint64_t addend)) const {
- if ( header.patchInfoAddr == 0 )
- return;
-
- uint32_t patchVersion = patchInfoVersion();
-
- if ( patchVersion == 1 ) {
- // Old cache. The patch table uses the V1 structs
-
- // This patch table uses cache offsets, so convert from "image + offset" to cache offset
- uint64_t mTime;
- uint64_t inode;
- const dyld3::MachOAnalyzer* imageMA = (dyld3::MachOAnalyzer*)(this->getIndexedImageEntry(imageIndex, mTime, inode));
- if ( imageMA == nullptr )
- return;
-
- uint64_t cacheUnslidAddress = unslidLoadAddress();
- uint32_t cacheOffsetOfImpl = (uint32_t)((imageMA->preferredLoadAddress() - cacheUnslidAddress) + dylibVMOffsetOfImpl);
-
- // Loading a new cache so get the data from the cache header
- const dyld_cache_patch_info_v1* patchInfo = getAddrField<dyld_cache_patch_info_v1*>(header.patchInfoAddr);
- const dyld_cache_image_patches_v1* patchArray = getAddrField<dyld_cache_image_patches_v1*>(patchInfo->patchTableArrayAddr);
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
- const dyld_cache_image_patches_v1& patch = patchArray[imageIndex];
- if ( (patch.patchExportsStartIndex + patch.patchExportsCount) > patchInfo->patchExportArrayCount )
- return;
-
- // V1 doesn't know which patch location corresponds to which dylib. This is expensive, but temporary, so find the dylib for
- // each patch
- struct DataRange
- {
- uint64_t cacheOffsetStart;
- uint64_t cacheOffsetEnd;
- };
- STACK_ALLOC_OVERFLOW_SAFE_ARRAY(DataRange, dataRanges, 8);
- __block const dyld3::MachOAnalyzer* userDylib = nullptr;
- __block uint32_t userDylibImageIndex = ~0U;
-
- const dyld_cache_patchable_export_v1* patchExports = getAddrField<dyld_cache_patchable_export_v1*>(patchInfo->patchExportArrayAddr);
- const dyld_cache_patchable_location_v1* patchLocations = getAddrField<dyld_cache_patchable_location_v1*>(patchInfo->patchLocationArrayAddr);
- for (uint64_t exportIndex = 0; exportIndex != patch.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export_v1& 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_v1& patchLocation = patchLocations[patchExport.patchLocationsStartIndex + locationIndex];
-
- bool computeNewRanges = false;
- if ( userDylib == nullptr ) {
- computeNewRanges = true;
- } else {
- bool inRange = false;
- for ( const DataRange& range : dataRanges ) {
- if ( (patchLocation.cacheOffset >= range.cacheOffsetStart) && (patchLocation.cacheOffset < range.cacheOffsetEnd) ) {
- inRange = true;
- break;
- }
- }
- if ( !inRange )
- computeNewRanges = true;
- }
-
- if ( computeNewRanges ) {
- userDylib = nullptr;
- userDylibImageIndex = ~0U;
- dataRanges.clear();
- forEachDylib(^(const dyld3::MachOAnalyzer* ma, const char* dylibPath, uint32_t cacheImageIndex, uint64_t, uint64_t, bool& stopImage) {
- ma->forEachSegment(^(const MachOAnalyzer::SegmentInfo& info, bool& stopSegment) {
- if ( info.writable() )
- dataRanges.push_back({ info.vmAddr - cacheUnslidAddress, info.vmAddr + info.vmSize - cacheUnslidAddress });
- });
-
- bool inRange = false;
- for ( const DataRange& range : dataRanges ) {
- if ( (patchLocation.cacheOffset >= range.cacheOffsetStart) && (patchLocation.cacheOffset < range.cacheOffsetEnd) ) {
- inRange = true;
- break;
- }
- }
- if ( inRange ) {
- // This is dylib we want. So we can keep these ranges, and record this mach-header
- userDylib = ma;
- userDylibImageIndex = cacheImageIndex;
- stopImage = true;
- } else {
- // These ranges don't work. Clear them and move on to the next dylib
- dataRanges.clear();
- }
- });
- }
-
- assert(userDylib != nullptr);
- assert(userDylibImageIndex != ~0U);
- assert(!dataRanges.empty());
-
- // We only want fixups in a specific image. Skip any others
- if ( userDylibImageIndex == userImageIndex ) {
- uint32_t userVMOffset = (uint32_t)((cacheUnslidAddress + patchLocation.cacheOffset) - userDylib->preferredLoadAddress());
- dyld3::MachOLoaded::PointerMetaData pmd;
- pmd.diversity = patchLocation.discriminator;
- pmd.high8 = patchLocation.high7 << 1;
- pmd.authenticated = patchLocation.authenticated;
- pmd.key = patchLocation.key;
- pmd.usesAddrDiversity = patchLocation.usesAddressDiversity;
-
- handler(userVMOffset, pmd, patchLocation.getAddend());
- }
- }
- }
- return;
- }
-
- // V2 and newer structs
- if ( patchVersion == 2 ) {
- const auto* patchInfo = getAddrField<dyld_cache_patch_info_v2*>(header.patchInfoAddr);
- const auto* patchArray = getAddrField<dyld_cache_image_patches_v2*>(patchInfo->patchTableArrayAddr);
- const auto* imageExports = getAddrField<dyld_cache_image_export_v2*>(patchInfo->patchImageExportsArrayAddr);
- const auto* clientArray = getAddrField<dyld_cache_image_clients_v2*>(patchInfo->patchClientsArrayAddr);
- const auto* clientExports = getAddrField<dyld_cache_patchable_export_v2*>(patchInfo->patchClientExportsArrayAddr);
- const auto* patchLocations = getAddrField<dyld_cache_patchable_location_v2*>(patchInfo->patchLocationArrayAddr);
-
- // FIXME: This shouldn't be possible. The cache builder always adds 1 dyld_cache_image_patches_v2 per-image. But for now
- // be conservative to match V1.
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
-
- const dyld_cache_image_patches_v2& imagePatches = patchArray[imageIndex];
- // FIXME: This shouldn't be possible. We should catch this in the builder instead
- if ( (imagePatches.patchClientsStartIndex + imagePatches.patchClientsCount) > patchInfo->patchClientsArrayCount )
- return;
-
- for (uint64_t clientIndex = 0; clientIndex != imagePatches.patchClientsCount; ++clientIndex) {
- const dyld_cache_image_clients_v2& client = clientArray[imagePatches.patchClientsStartIndex + clientIndex];
-
- // We only want fixups in a specific image. Skip any others
- if ( client.clientDylibIndex != userImageIndex )
- continue;
-
- // FIXME: This shouldn't be possible. We should catch this in the builder instead
- if ( (client.patchExportsStartIndex + client.patchExportsCount) > patchInfo->patchClientExportsArrayCount )
- return;
-
- for (uint64_t exportIndex = 0; exportIndex != client.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export_v2& clientExport = clientExports[client.patchExportsStartIndex + exportIndex];
-
- // The client export points to an image export from the image we are rooting
- if ( clientExport.imageExportIndex > patchInfo->patchImageExportsArrayCount )
- return;
-
- const dyld_cache_image_export_v2& imageExport = imageExports[clientExport.imageExportIndex];
-
- if ( imageExport.dylibOffsetOfImpl != dylibVMOffsetOfImpl )
- continue;
-
- if ( (clientExport.patchLocationsStartIndex + clientExport.patchLocationsCount) > patchInfo->patchLocationArrayCount )
- return;
-
- for (uint64_t locationIndex = 0; locationIndex != clientExport.patchLocationsCount; ++locationIndex) {
- const dyld_cache_patchable_location_v2& patchLocation = patchLocations[clientExport.patchLocationsStartIndex + locationIndex];
-
- dyld3::MachOLoaded::PointerMetaData pmd;
- pmd.diversity = patchLocation.discriminator;
- pmd.high8 = patchLocation.high7 << 1;
- pmd.authenticated = patchLocation.authenticated;
- pmd.key = patchLocation.key;
- pmd.usesAddrDiversity = patchLocation.usesAddressDiversity;
-
- handler(patchLocation.dylibOffsetOfUse, pmd, patchLocation.getAddend());
- }
- }
-
- // We only wanted to process this image. We are now done
- break;
- }
- return;
- }
-
- assert(false);
-}
-
-void DyldSharedCache::forEachPatchableUseOfExport(uint32_t imageIndex, uint32_t dylibVMOffsetOfImpl,
- void (^handler)(uint64_t cacheVMOffset,
- MachOLoaded::PointerMetaData pmd, uint64_t addend)) const {
- if ( header.patchInfoAddr == 0 )
- return;
-
- uint32_t patchVersion = patchInfoVersion();
-
- if ( patchVersion == 1 ) {
- // Old cache. The patch table uses the V1 structs
-
- // This patch table uses cache offsets, so convert from "image + offset" to cache offset
- uint64_t mTime;
- uint64_t inode;
- const dyld3::MachOAnalyzer* imageMA = (dyld3::MachOAnalyzer*)(this->getIndexedImageEntry(imageIndex, mTime, inode));
- if ( imageMA == nullptr )
- return;
-
- uint64_t cacheUnslidAddress = unslidLoadAddress();
- uint32_t cacheOffsetOfImpl = (uint32_t)((imageMA->preferredLoadAddress() - cacheUnslidAddress) + dylibVMOffsetOfImpl);
-
- // Loading a new cache so get the data from the cache header
- const dyld_cache_patch_info_v1* patchInfo = getAddrField<dyld_cache_patch_info_v1*>(header.patchInfoAddr);
- const dyld_cache_image_patches_v1* patchArray = getAddrField<dyld_cache_image_patches_v1*>(patchInfo->patchTableArrayAddr);
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
- const dyld_cache_image_patches_v1& patch = patchArray[imageIndex];
- if ( (patch.patchExportsStartIndex + patch.patchExportsCount) > patchInfo->patchExportArrayCount )
- return;
- const dyld_cache_patchable_export_v1* patchExports = getAddrField<dyld_cache_patchable_export_v1*>(patchInfo->patchExportArrayAddr);
- const dyld_cache_patchable_location_v1* patchLocations = getAddrField<dyld_cache_patchable_location_v1*>(patchInfo->patchLocationArrayAddr);
- for (uint64_t exportIndex = 0; exportIndex != patch.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export_v1& 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_v1& patchLocation = patchLocations[patchExport.patchLocationsStartIndex + locationIndex];
-
- dyld3::MachOLoaded::PointerMetaData pmd;
- pmd.diversity = patchLocation.discriminator;
- pmd.high8 = patchLocation.high7 << 1;
- pmd.authenticated = patchLocation.authenticated;
- pmd.key = patchLocation.key;
- pmd.usesAddrDiversity = patchLocation.usesAddressDiversity;
-
- handler(patchLocation.cacheOffset, pmd, patchLocation.getAddend());
- }
- }
- return;
- }
-
- // V2 and newer structs
- if ( patchVersion == 2 ) {
- const auto* patchInfo = getAddrField<dyld_cache_patch_info_v2*>(header.patchInfoAddr);
- const auto* patchArray = getAddrField<dyld_cache_image_patches_v2*>(patchInfo->patchTableArrayAddr);
- const auto* imageExports = getAddrField<dyld_cache_image_export_v2*>(patchInfo->patchImageExportsArrayAddr);
- const auto* clientArray = getAddrField<dyld_cache_image_clients_v2*>(patchInfo->patchClientsArrayAddr);
- const auto* clientExports = getAddrField<dyld_cache_patchable_export_v2*>(patchInfo->patchClientExportsArrayAddr);
- const auto* patchLocations = getAddrField<dyld_cache_patchable_location_v2*>(patchInfo->patchLocationArrayAddr);
-
- // FIXME: This shouldn't be possible. The cache builder always adds 1 dyld_cache_image_patches_v2 per-image. But for now
- // be conservative to match V1.
- if (imageIndex > patchInfo->patchTableArrayCount)
- return;
-
- const dyld_cache_image_patches_v2& imagePatches = patchArray[imageIndex];
- // FIXME: This shouldn't be possible. We should catch this in the builder instead
- if ( (imagePatches.patchClientsStartIndex + imagePatches.patchClientsCount) > patchInfo->patchClientsArrayCount )
- return;
-
- uint64_t cacheUnslidAddress = unslidLoadAddress();
-
- for (uint64_t clientIndex = 0; clientIndex != imagePatches.patchClientsCount; ++clientIndex) {
- const dyld_cache_image_clients_v2& client = clientArray[imagePatches.patchClientsStartIndex + clientIndex];
-
- // FIXME: This shouldn't be possible. We should catch this in the builder instead
- if ( (client.patchExportsStartIndex + client.patchExportsCount) > patchInfo->patchClientExportsArrayCount )
- return;
-
- // The callback wants a cache offset, so convert from "image + address" to a cache offset
- uint64_t clientModTime;
- uint64_t clientINode;
- const dyld3::MachOAnalyzer* clientMA = (dyld3::MachOAnalyzer*)(this->getIndexedImageEntry(client.clientDylibIndex, clientModTime, clientINode));
- if ( clientMA == nullptr )
- return;
-
- uint64_t clientUnslidAddress = clientMA->preferredLoadAddress();
-
- for (uint64_t exportIndex = 0; exportIndex != client.patchExportsCount; ++exportIndex) {
- const dyld_cache_patchable_export_v2& clientExport = clientExports[client.patchExportsStartIndex + exportIndex];
-
- // The client export points to an image export from the image we are rooting
- if ( clientExport.imageExportIndex > patchInfo->patchImageExportsArrayCount )
- return;
-
- const dyld_cache_image_export_v2& imageExport = imageExports[clientExport.imageExportIndex];
-
- if ( imageExport.dylibOffsetOfImpl != dylibVMOffsetOfImpl )
- continue;
-
- if ( (clientExport.patchLocationsStartIndex + clientExport.patchLocationsCount) > patchInfo->patchLocationArrayCount )
- return;
-
- for (uint64_t locationIndex = 0; locationIndex != clientExport.patchLocationsCount; ++locationIndex) {
- const dyld_cache_patchable_location_v2& patchLocation = patchLocations[clientExport.patchLocationsStartIndex + locationIndex];
-
- dyld3::MachOLoaded::PointerMetaData pmd;
- pmd.diversity = patchLocation.discriminator;
- pmd.high8 = patchLocation.high7 << 1;
- pmd.authenticated = patchLocation.authenticated;
- pmd.key = patchLocation.key;
- pmd.usesAddrDiversity = patchLocation.usesAddressDiversity;
-
- uint64_t cacheOffset = (clientUnslidAddress + patchLocation.dylibOffsetOfUse) - cacheUnslidAddress;
- handler(cacheOffset, pmd, patchLocation.getAddend());
- }
- }
- }
- return;
- }
-
- assert(false);
-}
-
-#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;
- // With subCaches, the first cache file might not have any slide info. In that case, walk all the files
- // until we find one with slide info
- forEachCache(^(const DyldSharedCache *cache, bool& stopCache) {
- cache->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 if ( slideInfoHeader->version == 4 ) {
- const dyld_cache_slide_info4* slideInfo = (dyld_cache_slide_info4*)(slideInfoHeader);
- assert(slideInfo->delta_mask == 0x00000000C0000000);
- pointerFormat = VMAddrConverter::SharedCacheFormat::v4;
- pointerValueAdd = slideInfo->value_add;
- } 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
-
-bool DyldSharedCache::inDyldCache(const DyldSharedCache* cache, const dyld3::MachOFile* mf) {
- // FIXME: The cache PBLS has a null state.config.dyldCache.addr when built, so we can't do the
- // range check. We might be able to remove the #if below if we can instead set the cache in the config.
-#if BUILDING_CACHE_BUILDER
- return mf->inDyldCache();
-#else
- return mf->inDyldCache() && (cache != nullptr) && ((uintptr_t)mf >= (uintptr_t)cache) && ((uintptr_t)mf < ((uintptr_t)cache + cache->mappedSize()));
-#endif
-}
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-// mmap() an shared cache file read/only but laid out like it would be at runtime
-const DyldSharedCache* DyldSharedCache::mapCacheFile(const char* path,
- uint64_t baseCacheUnslidAddress,
- uint8_t* buffer)
-{
- struct stat statbuf;
- if ( ::stat(path, &statbuf) ) {
- fprintf(stderr, "Error: stat failed for dyld shared cache at %s\n", path);
- return nullptr;
- }
-
- int cache_fd = ::open(path, O_RDONLY);
- if (cache_fd < 0) {
- fprintf(stderr, "Error: failed to open shared cache file at %s\n", path);
- return nullptr;
- }
-
- uint8_t firstPage[4096];
- if ( ::pread(cache_fd, firstPage, 4096, 0) != 4096 ) {
- fprintf(stderr, "Error: failed to read shared cache file at %s\n", path);
- return nullptr;
- }
- const dyld_cache_header* header = (dyld_cache_header*)firstPage;
- if ( header->mappingCount == 0 ) {
- fprintf(stderr, "Error: No mapping in shared cache file at %s\n", path);
- return nullptr;
- }
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(firstPage + header->mappingOffset);
- const dyld_cache_mapping_info* lastMapping = &mappings[header->mappingCount - 1];
-
- // Allocate enough space for the cache and all subCaches
- uint64_t subCacheBufferOffset = 0;
- if ( baseCacheUnslidAddress == 0 ) {
- size_t vmSize = (size_t)header->sharedRegionSize;
- // If the size is 0, then we might be looking directly at a sub cache. In that case just allocate a buffer large
- // enough for its mappings.
- if ( vmSize == 0 ) {
- vmSize = (size_t)(lastMapping->address + lastMapping->size - mappings[0].address);
- }
- vm_address_t result;
- kern_return_t r = ::vm_allocate(mach_task_self(), &result, vmSize, VM_FLAGS_ANYWHERE);
- if ( r != KERN_SUCCESS ) {
- fprintf(stderr, "Error: failed to allocate space to load shared cache file at %s\n", path);
- return nullptr;
- }
- buffer = (uint8_t*)result;
- } else {
- subCacheBufferOffset = mappings[0].address - baseCacheUnslidAddress;
- }
-
- for (uint32_t i=0; i < header->mappingCount; ++i) {
- uint64_t mappingAddressOffset = mappings[i].address - mappings[0].address;
- void* mapped_cache = ::mmap((void*)(buffer + mappingAddressOffset + subCacheBufferOffset), (size_t)mappings[i].size,
- mappings[i].maxProt, MAP_FIXED | MAP_PRIVATE, cache_fd, mappings[i].fileOffset);
- if (mapped_cache == MAP_FAILED) {
- fprintf(stderr, "Error: mmap() for shared cache at %s failed, errno=%d\n", path, errno);
- return nullptr;
- }
- }
- ::close(cache_fd);
-
- return (DyldSharedCache*)(buffer + subCacheBufferOffset);
-}
-
-std::vector<const DyldSharedCache*> DyldSharedCache::mapCacheFiles(const char* path)
-{
- const DyldSharedCache* cache = DyldSharedCache::mapCacheFile(path, 0, nullptr);
- if ( cache == nullptr )
- return {};
-
- std::vector<const DyldSharedCache*> caches;
- caches.push_back(cache);
-
- // Load all subcaches, if we have them
- if ( cache->header.mappingOffset >= __offsetof(dyld_cache_header, subCacheArrayCount) ) {
- if ( cache->header.subCacheArrayCount != 0 ) {
- const dyld_subcache_entry* subCacheEntries = (dyld_subcache_entry*)((uint8_t*)cache + cache->header.subCacheArrayOffset);
-
- for (uint32_t i = 0; i != cache->header.subCacheArrayCount; ++i) {
- std::string subCachePath = std::string(path) + "." + dyld3::json::decimal(i + 1);
- const DyldSharedCache* subCache = DyldSharedCache::mapCacheFile(subCachePath.c_str(), cache->unslidLoadAddress(), (uint8_t*)cache);
- if ( subCache == nullptr )
- return {};
-
- if ( memcmp(subCache->header.uuid, subCacheEntries[i].uuid, 16) != 0 ) {
- uuid_string_t expectedUUIDString;
- uuid_unparse_upper(subCacheEntries[i].uuid, expectedUUIDString);
- uuid_string_t foundUUIDString;
- uuid_unparse_upper(subCache->header.uuid, foundUUIDString);
- fprintf(stderr, "Error: SubCache[%i] UUID mismatch. Expected %s, got %s\n", i, expectedUUIDString, foundUUIDString);
- return {};
- }
-
- caches.push_back(subCache);
- }
- }
- }
-
- return caches;
-}
-
-void DyldSharedCache::applyCacheRebases() const {
- auto rebaseChainV4 = ^(uint8_t* pageContent, uint16_t startOffset, const dyld_cache_slide_info4* slideInfo)
- {
- const uintptr_t deltaMask = (uintptr_t)(slideInfo->delta_mask);
- const uintptr_t valueMask = ~deltaMask;
- //const uintptr_t valueAdd = (uintptr_t)(slideInfo->value_add);
- const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2;
-
- uint32_t pageOffset = startOffset;
- uint32_t delta = 1;
- while ( delta != 0 ) {
- uint8_t* loc = pageContent + pageOffset;
- uintptr_t rawValue = *((uintptr_t*)loc);
- delta = (uint32_t)((rawValue & deltaMask) >> deltaShift);
- pageOffset += delta;
- uintptr_t value = (rawValue & valueMask);
- if ( (value & 0xFFFF8000) == 0 ) {
- // small positive non-pointer, use as-is
- }
- else if ( (value & 0x3FFF8000) == 0x3FFF8000 ) {
- // small negative non-pointer
- value |= 0xC0000000;
- }
- else {
- // We don't want to fix up pointers, just the stolen integer slots above
- // value += valueAdd;
- // value += slideAmount;
- continue;
- }
- *((uintptr_t*)loc) = value;
- //dyld::log(" pageOffset=0x%03X, loc=%p, org value=0x%08llX, new value=0x%08llX, delta=0x%X\n", pageOffset, loc, (uint64_t)rawValue, (uint64_t)value, delta);
- }
- };
-
- // On watchOS, the slide info v4 format steals high bits of integers. We need to undo these
- this->forEachCache(^(const DyldSharedCache *subCache, bool& stopCache) {
- subCache->forEachSlideInfo(^(uint64_t mappingStartAddress, uint64_t mappingSize, const uint8_t *dataPagesStart,
- uint64_t slideInfoOffset, uint64_t slideInfoSize, const dyld_cache_slide_info *slideInfo) {
- if ( slideInfo->version == 4) {
- const dyld_cache_slide_info4* slideHeader = (dyld_cache_slide_info4*)slideInfo;
- const uint32_t page_size = slideHeader->page_size;
- const uint16_t* page_starts = (uint16_t*)((long)(slideInfo) + slideHeader->page_starts_offset);
- const uint16_t* page_extras = (uint16_t*)((long)(slideInfo) + slideHeader->page_extras_offset);
- for (int i=0; i < slideHeader->page_starts_count; ++i) {
- uint8_t* page = (uint8_t*)(long)(dataPagesStart + (page_size*i));
- uint16_t pageEntry = page_starts[i];
- //dyld::log("page[%d]: page_starts[i]=0x%04X\n", i, pageEntry);
- if ( pageEntry == DYLD_CACHE_SLIDE4_PAGE_NO_REBASE )
- continue;
- if ( pageEntry & DYLD_CACHE_SLIDE4_PAGE_USE_EXTRA ) {
- uint16_t chainIndex = (pageEntry & DYLD_CACHE_SLIDE4_PAGE_INDEX);
- bool done = false;
- while ( !done ) {
- uint16_t pInfo = page_extras[chainIndex];
- uint16_t pageStartOffset = (pInfo & DYLD_CACHE_SLIDE4_PAGE_INDEX)*4;
- //dyld::log(" chain[%d] pageOffset=0x%03X\n", chainIndex, pageStartOffset);
- rebaseChainV4(page, pageStartOffset, slideHeader);
- done = (pInfo & DYLD_CACHE_SLIDE4_PAGE_EXTRA_END);
- ++chainIndex;
- }
- }
- else {
- uint32_t pageOffset = pageEntry * 4;
- //dyld::log(" start pageOffset=0x%03X\n", pageOffset);
- rebaseChainV4(page, pageOffset, slideHeader);
- }
- }
- }
- });
- });
-}
-
-#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;
-}
-
-const objc_opt::objc_opt_t* DyldSharedCache::objcOpt() const
-{
- // Find the objc image
- __block const dyld3::MachOAnalyzer* objcMA = nullptr;
- uint32_t imageIndex;
- if ( this->hasImagePath("/usr/lib/libobjc.A.dylib", imageIndex) ) {
- uint64_t mTime;
- uint64_t inode;
- objcMA = (dyld3::MachOAnalyzer*)(this->getIndexedImageEntry(imageIndex, mTime, inode));
- } else {
-#if BUILDING_CACHE_BUILDER
- // The cache builder might call this before prior to the trie being written.
- // In this case, we can still use the image list which is always available
- forEachImage(^(const mach_header *mh, const char *installName) {
- if ( !strcmp(installName, "/usr/lib/libobjc.A.dylib") )
- objcMA = (const dyld3::MachOAnalyzer*)mh;
- });
-#endif
- }
-
- if ( objcMA == nullptr )
- return nullptr;
-
- // If we found the objc image, then try to find the read-only data inside.
- __block const objc_opt::objc_opt_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 = (objc_opt::objc_opt_t*)(info.sectAddr + slide);
- });
- if ( objcROContent == nullptr )
- return nullptr;
-
- // FIXME: We should fix this once objc and dyld are both in-sync with Large Caches changes
- if ( objcROContent->version == objc_opt::VERSION || (objcROContent->version == 15) )
- return objcROContent;
-
- return nullptr;
-}
-
-const void* DyldSharedCache::objcOptPtrs() const
-{
- // Find the objc image
- const dyld3::MachOAnalyzer* objcMA = nullptr;
- uint32_t imageIndex;
- if ( this->hasImagePath("/usr/lib/libobjc.A.dylib", imageIndex) ) {
- uint64_t mTime;
- uint64_t inode;
- objcMA = (dyld3::MachOAnalyzer*)this->getIndexedImageEntry(imageIndex, mTime, inode);
- }
- 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;
-}
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-uint64_t DyldSharedCache::sharedCacheRelativeSelectorBaseVMAddress() const {
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, symbolFileUUID) )
- return 0;
-
- // In newer shared caches, relative method list selectors are offsets from the magic selector in libobjc
- __block uint64_t sharedCacheRelativeSelectorBaseVMAddress = 0;
- constexpr std::string_view magicSelector = "\xf0\x9f\xa4\xaf";
- dyld3::MachOAnalyzer::VMAddrConverter vmAddrConverter = makeVMAddrConverter(false);
- uint64_t sharedCacheSlide = (uint64_t)this - unslidLoadAddress();
- forEachImage(^(const mach_header *mh, const char *installName) {
- if ( !strcmp(installName, "/usr/lib/libobjc.A.dylib") ) {
- const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh;
- Diagnostics diag;
- ma->forEachObjCSelectorReference(diag, vmAddrConverter,
- ^(uint64_t selRefVMAddr, uint64_t selRefTargetVMAddr, bool &stop) {
- const char* selValue = (const char*)(selRefTargetVMAddr + sharedCacheSlide);
- if ( selValue == magicSelector ) {
- sharedCacheRelativeSelectorBaseVMAddress = selRefTargetVMAddr;
- stop = true;
- }
- });
- }
- });
- return sharedCacheRelativeSelectorBaseVMAddress;
-}
-#endif
-
-const SwiftOptimizationHeader* DyldSharedCache::swiftOpt() const {
- // check for old cache without imagesArray
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, swiftOptsSize) )
- return nullptr;
-
- if ( header.swiftOptsOffset == 0 )
- return nullptr;
-
- return (SwiftOptimizationHeader*)((char*)this + header.swiftOptsOffset);
-}
-
-std::pair<const void*, uint64_t> DyldSharedCache::getObjCConstantRange() const
-{
- uint32_t imageIndex;
- if ( this->hasImagePath("/usr/lib/system/libdyld.dylib", imageIndex) ) {
- uint64_t mTime;
- uint64_t inode;
- const dyld3::MachOAnalyzer* libDyldMA = (dyld3::MachOAnalyzer*)this->getIndexedImageEntry(imageIndex, mTime, inode);
- 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);
- }
- }
- }
-}
-
-const char* DyldSharedCache::getCanonicalPath(const char *path) const
-{
- uint32_t dyldCacheImageIndex;
- if ( hasImagePath(path, dyldCacheImageIndex) )
- return getIndexedImagePath(dyldCacheImageIndex);
- return nullptr;
-}
-
-#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