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--- dyld/dyld-1340/common/DyldSharedCache.cpp
+++ /dev/null
@@ -1,2831 +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 <TargetConditionals.h>
-
-#if !TARGET_OS_EXCLAVEKIT
-#include <dirent.h>
-#include <sys/errno.h>
-#include <sys/fcntl.h>
-#include <sys/mman.h>
-#include <sys/param.h>
-#include <sys/fsgetpath.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>
-#endif // !TARGET_OS_EXCLAVEKIT
-
-#if BUILDING_CACHE_BUILDER || BUILDING_CACHE_BUILDER_UNIT_TESTS
-#include <set>
-#include <string>
-#include <vector>
-#include <unordered_map>
-#include <unordered_set>
-#include "FileUtils.h"
-#endif
-
-#define NO_ULEB
-#include "MachOLoaded.h"
-#include "DyldSharedCache.h"
-#include "Header.h"
-#include "Trie.hpp"
-#include "StringUtils.h"
-#if !TARGET_OS_EXCLAVEKIT
-#include "PrebuiltLoader.h"
-#include "OptimizerSwift.h"
-#include "ClosureFileSystemPhysical.h"
-#endif
-
-#include "objc-shared-cache.h"
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-#include "JSONWriter.h"
-#include <sstream>
-#endif
-
-using dyld3::MachOFile;
-using dyld3::MachOLoaded;
-using dyld3::MachOAnalyzer;
-using dyld4::PrebuiltLoader;
-using dyld4::PrebuiltLoaderSet;
-
-using mach_o::Header;
-using mach_o::Platform;
-
-
-void DyldSharedCache::getUUID(uuid_t uuid) const
-{
- memcpy(uuid, header.uuid, sizeof(uuid_t));
-}
-
-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;
-}
-
-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);
-}
-
-void DyldSharedCache::forEachPrewarmingEntry(void (^handler)(const void* content, uint64_t unslidVMAddr, uint64_t vmSize)) const
-{
- if ( header.mappingOffset <= offsetof(dyld_cache_header, prewarmingDataSize) )
- return;
-
-
- const dyld_prewarming_header* prewarmingHeader = (const dyld_prewarming_header*)((char*)this + header.prewarmingDataOffset);
- if ( prewarmingHeader->version != 1 )
- return;
-
- const dyld_prewarming_entry* firstEntry = &prewarmingHeader->entries[0];
-
- const uint64_t baseAddress = this->unslidLoadAddress();
- for ( const dyld_prewarming_entry& entry : std::span(firstEntry, prewarmingHeader->count) ) {
- handler((const uint8_t*)this + entry.cacheVMOffset, baseAddress + entry.cacheVMOffset,
- entry.numPages * DYLD_CACHE_PREWARMING_DATA_PAGE_SIZE);
- }
-}
-
-const char* DyldSharedCache::mappingName(uint32_t maxProt, uint64_t flags)
-{
- if ( maxProt & VM_PROT_EXECUTE ) {
- if ( flags & DYLD_CACHE_MAPPING_TEXT_STUBS ) {
- return "__TEXT_STUBS";
- } else {
- return "__TEXT";
- }
- } else if ( maxProt & VM_PROT_WRITE ) {
- if ( flags & DYLD_CACHE_MAPPING_AUTH_DATA ) {
- if ( flags & DYLD_CACHE_MAPPING_DIRTY_DATA )
- return "__AUTH_DIRTY";
- else if ( flags & DYLD_CACHE_MAPPING_CONST_TPRO_DATA )
- return "__AUTH_TPRO_CONST";
- else if ( flags & DYLD_CACHE_MAPPING_CONST_DATA )
- return "__AUTH_CONST";
- else
- return "__AUTH";
- } else {
- if ( flags & DYLD_CACHE_MAPPING_DIRTY_DATA )
- return "__DATA_DIRTY";
- else if ( flags & DYLD_CACHE_MAPPING_CONST_TPRO_DATA )
- return "__TPRO_CONST";
- else if ( flags & DYLD_CACHE_MAPPING_CONST_DATA )
- return "__DATA_CONST";
- else
- return "__DATA";
- }
- }
- else if ( maxProt & VM_PROT_READ ) {
- if ( flags & DYLD_CACHE_READ_ONLY_DATA )
- return "__READ_ONLY";
- else
- return "__LINKEDIT";
- } else {
- return "*unknown*";
- }
- return "";
-}
-
-uint64_t DyldSharedCache::getSubCacheVmOffset(uint8_t index) const {
- if (header.mappingOffset <= offsetof(dyld_cache_header, cacheSubType) ) {
- const dyld_subcache_entry_v1* subCacheEntries = (dyld_subcache_entry_v1*)((uintptr_t)this + header.subCacheArrayOffset);
- return subCacheEntries[index].cacheVMOffset;
- } else {
- const dyld_subcache_entry* subCacheEntries = (dyld_subcache_entry*)((uintptr_t)this + header.subCacheArrayOffset);
- return subCacheEntries[index].cacheVMOffset;
- }
-}
-
-void DyldSharedCache::forEachRegion(void (^handler)(const void* content, uint64_t vmAddr, uint64_t size,
- uint32_t initProt, uint32_t maxProt, uint64_t flags,
- uint64_t fileOffset,
- 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, m->fileOffset, 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];
- uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- for (const dyld_cache_mapping_and_slide_info* m=mappings; m < mappingsEnd; ++m) {
- bool stop = false;
- // this is only called with a mapped dyld cache. That means to get content,
- // we cannot use fileoffset, but intead us vmAddr + slide
- const void* content = (void*)(m->address + slide);
- handler(content, m->address, m->size, m->initProt, m->maxProt, m->flags, m->fileOffset, stop);
- if ( stop )
- return;
- }
- }
-}
-
-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;
-
- for (uint32_t i = 0; i != header.subCacheArrayCount; ++i) {
- const DyldSharedCache* cache = (const DyldSharedCache*)((uintptr_t)this + this->getSubCacheVmOffset(i));
- handler(cache, 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,
- uint64_t fileOffset, bool& stopRegion) {
- const char* mappingName = DyldSharedCache::mappingName(maxProt, flags);
- 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::forEachDylib(void (^handler)(const Header* mh, 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 Header*)mh, dylibPath, i, dylibs[i].inode, dylibs[i].modTime, stop);
- if ( stop )
- break;
- }
-}
-
-std::span<const dyld_cache_image_text_info> DyldSharedCache::textImageSegments() const
-{
- // check for old cache without imagesText array
- if ( (header.mappingOffset <= offsetof(dyld_cache_header, imagesTextOffset)) || (header.imagesTextCount == 0) )
- return { };
-
- 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];
- return { imagesText, imagesTextEnd };
-}
-
-void DyldSharedCache::forEachImageTextSegment(void (^handler)(uint64_t loadAddressUnslid, uint64_t textSegmentSize, const uuid_t dylibUUID, const char* installName, bool& stop)) const
-{
- for (const dyld_cache_image_text_info& p : this->textImageSegments() ) {
- bool stop = false;
- handler(p.loadAddress, p.textSegmentSize, p.uuid, (char*)this + p.pathOffset, stop);
- if ( stop )
- break;
- }
-}
-
-std::string_view DyldSharedCache::imagePath(const dyld_cache_image_text_info& info) const
-{
- return (char*)this + info.pathOffset;
-}
-
-uint64_t DyldSharedCache::unslidLoadAddress() const
-{
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- return mappings[0].address;
-}
-
-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);
-}
-
-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;
-}
-
-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*)((uintptr_t)this + header.mappingOffset);
- mTime = dylibs[index].modTime;
- inode = dylibs[index].inode;
- return (mach_header*)((uintptr_t)this + dylibs[index].address - mappings[0].address);
-}
-
-const mach_header* DyldSharedCache::getIndexedImageEntry(uint32_t index) const
-{
- uint64_t mTime = 0;
- uint64_t inode = 0;
- return this->getIndexedImageEntry(index, mTime, inode);
-}
-
-const char* DyldSharedCache::getIndexedImagePath(uint32_t index) const
-{
- auto dylibs = images();
- return (char*)this + dylibs[index].pathFileOffset;
-}
-
-
-const mach_o::Header* 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 (mach_o::Header*)((uintptr_t)this + dylibs[dyldCacheImageIndex].address - mappings[0].address);
- return nullptr;
-}
-
-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,
- uint64_t fileOffset, bool& stopRegion) {
- if ( startAddr == 0 )
- startAddr = vmAddr;
- uint64_t end = vmAddr+size;
- if ( end > endAddr )
- endAddr = end;
- });
- return (endAddr - startAddr);
- }
-}
-
-bool DyldSharedCache::inDyldCache(const DyldSharedCache* cache, const dyld3::MachOFile* mf) {
- return inDyldCache(cache, (const mach_o::Header*)mf);
-}
-
-bool DyldSharedCache::inDyldCache(const DyldSharedCache* cache, const mach_o::Header* header) {
- return header->inDyldCache() && (cache != nullptr) && ((uintptr_t)header >= (uintptr_t)cache) && ((uintptr_t)header < ((uintptr_t)cache + cache->mappedSize()));
-}
-
-#if BUILDING_CACHE_BUILDER
-const objc_opt::objc_opt_t* DyldSharedCache::oldObjcOpt() const
-{
- return nullptr;
-}
-#else
-const objc_opt::objc_opt_t* DyldSharedCache::oldObjcOpt() const
-{
- // Find the objc image
- __block const Header* objcHdr = nullptr;
- uint32_t imageIndex;
- if ( this->hasImagePath("/usr/lib/libobjc.A.dylib", imageIndex) ) {
- uint64_t mTime;
- uint64_t inode;
- objcHdr = (const Header*)(this->getIndexedImageEntry(imageIndex, mTime, inode));
- }
-
- if ( objcHdr == 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 = objcHdr->getSlide();
- objcHdr->forEachSection(^(const Header::SectionInfo& info, bool& stop) {
- if ( info.segmentName != "__TEXT" )
- return;
- if ( info.sectionName != "__objc_opt_ro" )
- return;
- objcROContent = (objc_opt::objc_opt_t*)(info.address + 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;
-}
-#endif
-
-const ObjCOptimizationHeader* DyldSharedCache::objcOpts() const
-{
- if ( header.mappingOffset <= offsetof(dyld_cache_header, objcOptsSize) )
- return nullptr;
-
- return (const ObjCOptimizationHeader*)((char*)this + header.objcOptsOffset);
-}
-
-const objc::HeaderInfoRO* DyldSharedCache::objcHeaderInfoRO() const
-{
- if ( const ObjCOptimizationHeader* opts = this->objcOpts() ) {
- if ( opts->headerInfoROCacheOffset != 0 )
- return (const objc::HeaderInfoRO*)((char*)this + opts->headerInfoROCacheOffset);
- return nullptr;
- }
- if ( const objc_opt::objc_opt_t* opts = this->oldObjcOpt() )
- return (const objc::HeaderInfoRO*)opts->headeropt_ro();
- return nullptr;
-}
-
-const objc::HeaderInfoRW* DyldSharedCache::objcHeaderInfoRW() const
-{
- if ( const ObjCOptimizationHeader* opts = this->objcOpts() ) {
- if ( opts->headerInfoRWCacheOffset != 0 )
- return (const objc::HeaderInfoRW*)((char*)this + opts->headerInfoRWCacheOffset);
- return nullptr;
- }
- if ( const objc_opt::objc_opt_t* opts = this->oldObjcOpt() )
- return (const objc::HeaderInfoRW*)opts->headeropt_rw();
- return nullptr;
-}
-
-const objc::ClassHashTable* DyldSharedCache::objcClassHashTable() const
-{
- if ( const ObjCOptimizationHeader* opts = this->objcOpts() ) {
- if ( opts->classHashTableCacheOffset != 0 )
- return (const objc::ClassHashTable*)((char*)this + opts->classHashTableCacheOffset);
- return nullptr;
- }
- if ( const objc_opt::objc_opt_t* opts = this->oldObjcOpt() )
- return opts->classOpt();
- return nullptr;
-}
-
-const objc::SelectorHashTable* DyldSharedCache::objcSelectorHashTable() const
-{
- if ( const ObjCOptimizationHeader* opts = this->objcOpts() ) {
- if ( opts->selectorHashTableCacheOffset != 0 )
- return (const objc::SelectorHashTable*)((char*)this + opts->selectorHashTableCacheOffset);
- return nullptr;
- }
- if ( const objc_opt::objc_opt_t* opts = this->oldObjcOpt() )
- return opts->selectorOpt();
- return nullptr;
-}
-
-const objc::ProtocolHashTable* DyldSharedCache::objcProtocolHashTable() const
-{
- if ( const ObjCOptimizationHeader* opts = this->objcOpts() ) {
- if ( opts->protocolHashTableCacheOffset != 0 )
- return (const objc::ProtocolHashTable*)((char*)this + opts->protocolHashTableCacheOffset);
- return nullptr;
- }
- if ( const objc_opt::objc_opt_t* opts = this->oldObjcOpt() )
- return opts->protocolOpt();
- return nullptr;
-}
-
-
-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;
-
- SwiftOptimizationHeader* optHeader = (SwiftOptimizationHeader*)((char*)this + header.swiftOptsOffset);
- return optHeader;
-}
-
-template<typename T>
-const T DyldSharedCache::getAddrField(uint64_t addr) const {
- uint64_t slide = (uint64_t)this - unslidLoadAddress();
- return (const T)(addr + slide);
-}
-
-const void* DyldSharedCache::patchTable() const
-{
- return getAddrField<const void*>(header.patchInfoAddr);
-}
-
-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;
-}
-
-void DyldSharedCache::forEachPatchableGOTUseOfExport(uint32_t imageIndex, uint32_t dylibVMOffsetOfImpl,
- void (^handler)(uint64_t cacheVMOffset,
- MachOFile::PointerMetaData pmd,
- uint64_t addend,
- bool isWeakImport)) const {
- if ( header.patchInfoAddr == 0 )
- return;
-
- uint32_t patchVersion = patchInfoVersion();
-
- if ( patchVersion == 1 ) {
- // Old cache. Only V3 has GOT patching
- return;
- }
-
- // V3 and newer structs
- PatchTable patchTable(this->patchTable(), header.patchInfoAddr);
- patchTable.forEachPatchableGOTUseOfExport(imageIndex, dylibVMOffsetOfImpl, handler);
-}
-
-void DyldSharedCache::forEachPatchableUseOfExport(uint32_t imageIndex, uint32_t dylibVMOffsetOfImpl,
- void (^handler)(uint64_t cacheVMOffset,
- MachOLoaded::PointerMetaData pmd, uint64_t addend,
- bool isWeakImport)) const {
- if ( header.patchInfoAddr == 0 )
- return;
-
- uint32_t patchVersion = patchInfoVersion();
-
- // Get GOT patches if we have them
- this->forEachPatchableGOTUseOfExport(imageIndex, dylibVMOffsetOfImpl, handler);
-
- 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)((((const Header*)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(), false);
- }
- }
- return;
- }
-
- // V2/V3 and newer structs
- auto getDylibAddress = ^(uint32_t dylibImageIndex) {
- auto* clientHdr = (const Header*)(this->getIndexedImageEntry(dylibImageIndex));
- if ( clientHdr == nullptr )
- return 0ULL;
- return clientHdr->preferredLoadAddress();
- };
- PatchTable patchTable(this->patchTable(), header.patchInfoAddr);
- patchTable.forEachPatchableCacheUseOfExport(imageIndex, dylibVMOffsetOfImpl,
- this->unslidLoadAddress(),
- getDylibAddress, handler);
-}
-
-void DyldSharedCache::forEachPatchableExport(uint32_t imageIndex, void (^handler)(uint32_t dylibVMOffsetOfImpl, const char* exportName,
- PatchKind patchKind)) 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 = ((const Header*)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, PatchKind::regular);
- }
-
- return;
- }
-
- // V2 newer structs
- PatchTable patchTable(this->patchTable(), header.patchInfoAddr);
- patchTable.forEachPatchableExport(imageIndex, handler);
-}
-
-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/V3 and newer structs
- PatchTable patchTable(this->patchTable(), header.patchInfoAddr);
- return patchTable.imageHasClient(imageIndex, userImageIndex);
-}
-
-void DyldSharedCache::forEachPatchableUseOfExportInImage(uint32_t imageIndex, uint32_t dylibVMOffsetOfImpl, uint32_t userImageIndex,
- void (^handler)(uint32_t userVMOffset, MachOLoaded::PointerMetaData pmd, uint64_t addend,
- bool isWeakImport)) 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)((((const Header*)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 Header* 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 Header* hdr, const char* dylibPath, uint32_t cacheImageIndex, uint64_t, uint64_t, bool& stopImage) {
- hdr->forEachSegment(^(const Header::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 = hdr;
- 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(), false);
- }
- }
- }
- return;
- }
-
- // V2/V3 and newer structs
- PatchTable patchTable(this->patchTable(), header.patchInfoAddr);
- patchTable.forEachPatchableUseOfExportInImage(imageIndex, dylibVMOffsetOfImpl,
- userImageIndex, handler);
-}
-
-
-#if !TARGET_OS_EXCLAVEKIT
-#if (BUILDING_LIBDYLD || BUILDING_DYLD)
-VIS_HIDDEN bool gEnableSharedCacheDataConst = false;
-#endif
-
-
-const char* DyldSharedCache::getCacheTypeName(uint64_t cacheType) {
- switch ( cacheType ) {
- case kDyldSharedCacheTypeDevelopment:
- return "development";
- case kDyldSharedCacheTypeProduction:
- return "production";
- case kDyldSharedCacheTypeUniversal:
- return "universal";
- default:
- return "unknown";
- }
-}
-
-void DyldSharedCache::forEachTPRORegion(void (^handler)(const void* content, uint64_t unslidVMAddr, uint64_t vmSize,
- bool& stopRegion)) const
-{
- if ( header.mappingOffset <= offsetof(dyld_cache_header, tproMappingsCount) )
- return;
-
- uint64_t baseAddress = this->unslidLoadAddress();
-
- const dyld_cache_tpro_mapping_info* mappings = (const dyld_cache_tpro_mapping_info*)((char*)this + header.tproMappingsOffset);
- const dyld_cache_tpro_mapping_info* mappingsEnd = &mappings[header.tproMappingsCount];
- for (const dyld_cache_tpro_mapping_info* m = mappings; m < mappingsEnd; ++m) {
- bool stop = false;
- uint64_t offsetInCache = m->unslidAddress - baseAddress;
- handler((char*)this + (long)offsetInCache, m->unslidAddress, m->size, stop);
- if ( stop )
- return;
- }
-}
-
-int32_t DyldSharedCache::getSubCacheIndex(const void* addr) const
-{
- __block int32_t index = 0;
- __block bool found = false;
- this->forEachCache(^(const DyldSharedCache *cache, bool &stopCache) {
- bool readOnly = false;
- if ( cache->inCache(addr, sizeof(uint64_t), readOnly) ) {
- stopCache = true;
- found = true;
- return;
- }
- index++;
- });
- int32_t result = found ? index : -1;
- return result;
-}
-
-void DyldSharedCache::getSubCacheUuid(uint8_t index, uint8_t uuid[]) const {
- if (header.mappingOffset <= offsetof(dyld_cache_header, cacheSubType) ) {
- const dyld_subcache_entry_v1* subCacheEntries = (dyld_subcache_entry_v1*)((uintptr_t)this + header.subCacheArrayOffset);
- memcpy(uuid, subCacheEntries[index].uuid, 16);
- } else {
- const dyld_subcache_entry* subCacheEntries = (dyld_subcache_entry*)((uintptr_t)this + header.subCacheArrayOffset);
- memcpy(uuid, subCacheEntries[index].uuid, 16);
- }
-}
-
-bool DyldSharedCache::inCache(const void* addr, size_t length, bool& immutable) 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;
-
- // walk cache ranges
- __block bool found = false;
- auto inRange = ^(const char* mappingName, uint64_t unslidVMAddr, uint64_t vmSize, uint32_t cacheFileIndex,
- uint64_t fileOffset, uint32_t initProt, uint32_t maxProt, bool& stopRange) {
- if ( (unslidVMAddr <= unslidStart) && ((unslidStart+length) < (unslidVMAddr+vmSize)) ) {
- found = true;
- immutable = ((maxProt & VM_PROT_WRITE) == 0);
- stopRange = true;
- }
- };
- this->forEachRange(inRange, nullptr);
-
- return found;
-}
-
-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 Header* hdr, 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 Header* hdr = (const Header*)((char*)this + offset);
- handler(hdr, dylibPath);
- }
-}
-
-
-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*)((uintptr_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*)((uintptr_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*)((uintptr_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*)((uintptr_t)this + header.localSymbolsOffset);
- return localInfo->stringsSize;
-}
-
-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*)((uintptr_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);
- }
- }
-}
-
-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;
-}
-
-const DyldSharedCache::DynamicRegion* DyldSharedCache::dynamicRegion() const
-{
- const DyldSharedCache::DynamicRegion* dr = (const DynamicRegion*)((uint8_t*)this + header.dynamicDataOffset);
- if ( dr->validMagic() )
- return dr;
- return nullptr;
-}
-
-Platform DyldSharedCache::platform() const
-{
- return 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,
- uint64_t fileOffset, 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 )
- snprintf(lineBuffer, sizeof(lineBuffer), "mapping %s %4lluMB 0x%0llX -> 0x%0llX\n", prot, size/(1024*1024), vmAddr, vmAddr+size);
- else
- snprintf(lineBuffer, sizeof(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 Header* hdr, const char* installName) {
- result += std::string(installName) + "\n";
- hdr->forEachSegment(^(const Header::SegmentInfo& info, bool& stop) {
- char lineBuffer[256];
- snprintf(lineBuffer, sizeof(lineBuffer), "\t%16.*s 0x%08llX -> 0x%08llX\n",
- (int)info.segmentName.size(), info.segmentName.data(), info.vmaddr, info.vmaddr+info.vmsize);
- result += lineBuffer;
- });
- result += "\n";
- });
-
- return result;
-}
-#endif
-
-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;
-}
-
-const PrebuiltLoaderSet* DyldSharedCache::dylibsLoaderSet() const
-{
- if ( header.mappingOffset < offsetof(dyld_cache_header, programTrieSize) )
- 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;
-}
-
-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;
- if ( const PrebuiltLoaderSet* pbLoaderSet = this->dylibsLoaderSet() )
- return pbLoaderSet->atIndex(imageIndex);
-
- return nullptr;
-}
-
-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
-{
- return (findLaunchLoaderSetWithCDHash(cdHashString) != nullptr);
-}
-
-const dyld4::PrebuiltLoaderSet* DyldSharedCache::findLaunchLoaderSetWithCDHash(const char* cdHashString) const
-{
- if ( cdHashString == nullptr )
- return nullptr;
-
- // Check source doesn't overflow buffer. strncat unfortunately isn't available
- if ( strlen(cdHashString) >= 128 )
- return nullptr;
-
- char cdPath[140];
- strlcpy(cdPath, "/cdhash/", sizeof(cdPath));
- strlcat(cdPath, cdHashString, sizeof(cdPath));
- return findLaunchLoaderSet(cdPath);
-}
-
-
-#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);
- }
- }
-}
-
-void DyldSharedCache::forEachFunctionVariantPatchLocation(void (^handler)(const void* loc, PointerMetaData pmd, const mach_o::FunctionVariants& fvs, const mach_o::Header* dylibHdr, int variantIndex, bool& stop)) const
-{
- // check for old cache
- if ( header.mappingOffset <= __offsetof(dyld_cache_header, functionVariantInfoSize) )
- 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 dyld_cache_function_variant_info* table = (dyld_cache_function_variant_info*)((char*)this->header.functionVariantInfoAddr + slide);
-
- size_t sizeFromTable = offsetof(dyld_cache_function_variant_info, entries[table->count]);
- size_t sizeFromCacheHeader = (size_t)this->header.functionVariantInfoSize;
- if ( sizeFromTable > sizeFromCacheHeader )
- return; // something is wrong
-
- bool stop = false;
- for (uint32_t i=0; i < table->count; ++i) {
- const dyld_cache_function_variant_entry& entry = table->entries[i];
- std::span<const uint8_t> fvSpan{(uint8_t*)(entry.functionVariantTableVmAddr + slide), (size_t)(entry.functionVariantTableSizeDiv4*4)};
- const mach_o::FunctionVariants fvs(fvSpan);
- PointerMetaData pmd;
- pmd.authenticated = entry.pacAuth;
- pmd.key = entry.pacKey;
- pmd.usesAddrDiversity = entry.pacAddress;
- pmd.diversity = entry.pacDiversity;
- pmd.high8 = 0;
- handler((void*)(entry.fixupLocVmAddr + slide), pmd, fvs, (mach_o::Header*)(entry.dylibHeaderVmAddr+slide), entry.variantIndex, stop);
- if ( stop )
- break;
- }
-}
-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/V3 and newer structs
- PatchTable patchTable(this->patchTable(), header.patchInfoAddr);
- return patchTable.patchableExportCount(imageIndex);
-}
-
-#if BUILDING_SHARED_CACHE_UTIL
-void DyldSharedCache::forEachPatchableUseOfExport(uint32_t imageIndex, uint32_t dylibVMOffsetOfImpl,
- void (^handler)(uint32_t userImageIndex, uint32_t userVMOffset,
- MachOLoaded::PointerMetaData pmd, uint64_t addend,
- bool isWeakImport)) 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)((((const Header*)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 Header* 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 Header* hdr, const char* dylibPath, uint32_t cacheImageIndex, uint64_t, uint64_t, bool& stopImage) {
- hdr->forEachSegment(^(const Header::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 = hdr;
- 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(), false);
- }
- }
- return;
- }
-
- // V2/V3 and newer structs
- PatchTable patchTable(this->patchTable(), header.patchInfoAddr);
- patchTable.forEachPatchableUseOfExport(imageIndex, dylibVMOffsetOfImpl, handler);
-}
-#endif
-
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-// MRM map file generator
-std::string DyldSharedCache::generateJSONMap(const char* disposition, uuid_t cache_uuid, bool verbose) const {
- json::Node cacheNode;
-
- cacheNode.map["version"].value = "1";
- cacheNode.map["disposition"].value = disposition;
- cacheNode.map["base-address"].value = json::hex(unslidLoadAddress());
- uuid_string_t cache_uuidStr;
- uuid_unparse(cache_uuid, cache_uuidStr);
- cacheNode.map["uuid"].value = cache_uuidStr;
-
- __block json::Node imagesNode;
- forEachImage(^(const Header *hdr, const char *installName) {
- json::Node imageNode;
- imageNode.map["path"].value = installName;
- uuid_t uuid;
- if (hdr->getUuid(uuid)) {
- uuid_string_t uuidStr;
- uuid_unparse(uuid, uuidStr);
- imageNode.map["uuid"].value = uuidStr;
- }
-
- __block json::Node segmentsNode;
- hdr->forEachSegment(^(const Header::SegmentInfo &info, bool &stop) {
- json::Node segmentNode;
- segmentNode.map["name"].value = info.segmentName;
- segmentNode.map["start-vmaddr"].value = json::hex(info.vmaddr);
- segmentNode.map["end-vmaddr"].value = json::hex(info.vmaddr + info.vmsize);
-
- // Add sections in verbose mode
- if ( verbose ) {
- __block json::Node sectionsNode;
- hdr->forEachSection(^(const Header::SectionInfo& sectInfo, bool& stopSection) {
- if ( sectInfo.segmentName == info.segmentName ) {
- json::Node sectionNode;
- sectionNode.map["name"].value = sectInfo.sectionName;
- sectionNode.map["size"] = json::Node(sectInfo.size);
- sectionsNode.array.push_back(sectionNode);
- }
- });
- if ( !sectionsNode.array.empty() )
- segmentNode.map["sections"] = std::move(sectionsNode);
- }
- 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) {
- if ( slideInfoHeader->version == 1 ) {
- pointerFormat = VMAddrConverter::SharedCacheFormat::v1;
- pointerValueAdd = 0;
- } else 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 if ( slideInfoHeader->version == 5 ) {
- pointerFormat = VMAddrConverter::SharedCacheFormat::v5;
- 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
-
-
-bool DyldSharedCache::isSubCachePath(const char* leafName)
-{
- const char* firstDot = strchr(leafName, '.');
- // check for files with a suffix, to know wether or not they are sub-caches
- if ( firstDot != NULL ) {
- // skip files that are not of the format "<baseName>.development", as they are sub-caches
- if ( strcmp(firstDot, ".development") != 0 )
- return true;
- }
- return false;
-}
-
-#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)
-{
- // We don't need to map R-X as we aren't running the code here, so only allow mapping up to RW
- const uint32_t maxPermissions = VM_PROT_READ | VM_PROT_WRITE;
- 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 ( strncmp(header->magic, "dyld_v1", 7) != 0 ) {
- fprintf(stderr, "Error: Expected cache file magic to be 'dyld_v1...' in %s\n", path);
- return nullptr;
- }
-
- 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 & maxPermissions, 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);
-
- std::string basePath = std::string(path);
- if ( cache->header.cacheType == kDyldSharedCacheTypeUniversal )
- {
- std::size_t pos = basePath.find(DYLD_SHARED_CACHE_DEVELOPMENT_EXT);
- if (pos != std::string::npos)
- basePath = basePath.substr(0, basePath.size() - 12);
- }
- // 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);
- bool hasCacheSuffix = cache->header.mappingOffset > offsetof(dyld_cache_header, cacheSubType);
-
- for (uint32_t i = 0; i != cache->header.subCacheArrayCount; ++i) {
- std::string subCachePath = std::string(path) + "." + json::unpaddedDecimal(i + 1);
- if ( hasCacheSuffix ) {
- subCachePath = basePath + subCacheEntries[i].fileSuffix;
- }
- const DyldSharedCache* subCache = DyldSharedCache::mapCacheFile(subCachePath.c_str(), cache->unslidLoadAddress(), (uint8_t*)cache);
- if ( subCache == nullptr )
- return {};
-
- uint8_t uuid[16];
- cache->getSubCacheUuid(i, uuid);
- if ( memcmp(subCache->header.uuid, uuid, 16) != 0 ) {
- uuid_string_t expectedUUIDString;
- uuid_unparse_upper(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;
-}
-
-#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 void* DyldSharedCache::objcOptPtrs() const
-{
- // Find the objc image
- const Header* objcHdr = nullptr;
- uint32_t imageIndex;
- if ( this->hasImagePath("/usr/lib/libobjc.A.dylib", imageIndex) ) {
- uint64_t mTime;
- uint64_t inode;
- objcHdr = (const Header*)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 = objcHdr->getSlide();
- uint32_t pointerSize = objcHdr->pointerSize();
- objcHdr->forEachSection(^(const Header::SectionInfo& info, bool& stop) {
- if ( !info.segmentName.starts_with("__DATA") && !info.segmentName.starts_with("__AUTH") )
- return;
- if ( info.sectionName != "__objc_opt_ptrs" )
- return;
- if ( info.size != pointerSize ) {
- stop = true;
- return;
- }
- objcPointersContent = (uint8_t*)(info.address + slide);
- });
-
- return objcPointersContent;
-}
-
-bool DyldSharedCache::hasOptimizedObjC() const
-{
- return (this->objcOpts() != nullptr) || (this->oldObjcOpt() != nullptr);
-}
-
-uint32_t DyldSharedCache::objcOptVersion() const
-{
- if ( const ObjCOptimizationHeader* opts = this->objcOpts() )
- return opts->version;
- if ( const objc_opt::objc_opt_t* opts = this->oldObjcOpt() )
- return opts->version;
- return 0;
-}
-
-uint32_t DyldSharedCache::objcOptFlags() const
-{
- if ( const ObjCOptimizationHeader* opts = this->objcOpts() )
- return opts->flags;
- if ( const objc_opt::objc_opt_t* opts = this->oldObjcOpt() )
- return opts->flags;
- return 0;
-}
-
-const void* DyldSharedCache::objcRelativeMethodListsBaseAddress() const
-{
- if ( const ObjCOptimizationHeader* opts = this->objcOpts() ) {
- if ( opts->relativeMethodSelectorBaseAddressOffset != 0 )
- return (const void*)((char*)this + opts->relativeMethodSelectorBaseAddressOffset);
- return nullptr;
- }
- if ( const objc_opt::objc_opt_t* opts = this->oldObjcOpt() )
- return opts->relativeMethodListsBaseAddress();
- return nullptr;
-}
-
-#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
-uint64_t DyldSharedCache::sharedCacheRelativeSelectorBaseVMAddress() const {
- const void* value = this->objcRelativeMethodListsBaseAddress();
- if ( !value )
- return 0;
-
- uint64_t vmOffset = (uint64_t)value - (uint64_t)this;
- return this->unslidLoadAddress() + vmOffset;
-}
-#endif
-
-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;
-}
-#endif // !TARGET_OS_EXCLAVEKIT
-
-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 !TARGET_OS_EXCLAVEKIT
- 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
-#endif
- {
- 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 !TARGET_OS_EXCLAVEKIT
-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 Header *hdr, const char *iteratedInstallName) {
- dylibAnalyzers[std::string(iteratedInstallName)] = (dyld3::MachOAnalyzer*)hdr;
- });
-}
-
-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 Header *hdr, 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 Header *hdr, const char *installName) {
- std::set<std::string> visited;
- findDependentsRecursively(transitiveDependents, reverseDependencyMap, visited, std::string(installName));
- });
-}
-#endif
-
-
-
-DyldSharedCache::DynamicRegion* DyldSharedCache::DynamicRegion::make(uintptr_t prefAddress)
-{
- // allocate page for DynamicRegion
- DynamicRegion* dynamicRegion = nullptr;
- if ( prefAddress == 0 ) {
- // for system wide cache (loaded in launchd) we allocate a page at a random address
- // and __shared_region_map_and_slide_2_np() copies to a where the cache is mapped
- vm_address_t dynamicConfigData = 0;
- kern_return_t kr = ::vm_allocate(mach_task_self(), &dynamicConfigData, size(), VM_FLAGS_ANYWHERE);
- if ( kr != KERN_SUCCESS )
- return nullptr;
- dynamicRegion = (DynamicRegion*)dynamicConfigData;
- }
- else {
- // for private caches it is at a specified address
- void* mapResult = ::mmap((void*)prefAddress, size(), VM_PROT_READ | VM_PROT_WRITE, MAP_ANON | MAP_FIXED | MAP_PRIVATE, -1, 0);
- if ( mapResult == MAP_FAILED)
- return nullptr;
- dynamicRegion = (DynamicRegion*)mapResult;
- }
-
- // initialize header of dynamic data
- strcpy(dynamicRegion->_magic, sMagic);
-
- return dynamicRegion;
-}
-
-uint32_t DyldSharedCache::DynamicRegion::version() const
-{
- return _magic[14] - '0';
-}
-
-void DyldSharedCache::DynamicRegion::free()
-{
- ::vm_deallocate(mach_task_self(), (vm_address_t)this, (vm_size_t)size());
-}
-
-bool DyldSharedCache::DynamicRegion::validMagic() const
-{
- return (memcmp(_magic, sMagic, 14) == 0); // don't compare last char (version num)
-}
-
-size_t DyldSharedCache::DynamicRegion::size()
-{
- static_assert(sizeof(DynamicRegion) < 0x4000);
- return 0x4000;
-}
-
-void DyldSharedCache::DynamicRegion::setDyldCacheFileID(FileIdTuple ids)
-{
- _dyldCache = ids;
-}
-
-void DyldSharedCache::DynamicRegion::setOSCryptexPath(const char* path)
-{
- assert(_osCryptexPathOffset == 0); // Make sure we have not already set a cryptexPath
- assert(_cachePathOffset == 0); // setCachePath() uses _osCryptexPathOffset, so if it has already been set then this will corrupt it
- _osCryptexPathOffset = sizeof(DynamicRegion);
- strlcpy(((char*)this)+_osCryptexPathOffset, path, size()-_osCryptexPathOffset);
-}
-
-void DyldSharedCache::DynamicRegion::setCachePath(const char* path) {
- assert(_cachePathOffset == 0);
- _cachePathOffset = sizeof(DynamicRegion);
- if (const char* cryptexPath = osCryptexPath()) {
- _cachePathOffset += (sizeof(cryptexPath) + 1);
- }
- strlcpy(((char*)this)+_cachePathOffset, path, size()-_cachePathOffset);
-}
-
-
-void DyldSharedCache::DynamicRegion::setReadOnly()
-{
- ::mprotect(this, size(), VM_PROT_READ);
-}
-
-void DyldSharedCache::DynamicRegion::setSystemWideFlags(__uint128_t flags)
-{
- _systemWideFunctionVariantFlags = flags;
-}
-
-void DyldSharedCache::DynamicRegion::setProcessorFlags(__uint128_t flags)
-{
- _processorFunctionVariantFlags = flags;
-}
-
-bool DyldSharedCache::DynamicRegion::getDyldCacheFileID(FileIdTuple& ids) const
-{
- if ( !_dyldCache )
- return false;
-
- ids = _dyldCache;
- return true;
-}
-
-__uint128_t DyldSharedCache::DynamicRegion::getSystemWideFunctionVariantFlags() const
-{
- return _systemWideFunctionVariantFlags;
-}
-
-__uint128_t DyldSharedCache::DynamicRegion::getProcessorFunctionVariantFlags() const
-{
- return _processorFunctionVariantFlags;
-}
-
-
-const char* DyldSharedCache::DynamicRegion::osCryptexPath() const
-{
- if (!_osCryptexPathOffset)
- return nullptr;
-
- return ((char*)this)+_osCryptexPathOffset;
-}
-
-
-const char* DyldSharedCache::DynamicRegion::cachePath() const
-{
- if (!_cachePathOffset)
- return nullptr;
-
- return ((char*)this)+_cachePathOffset;
-}
-
-FileIdTuple::FileIdTuple(const char* path)
-{
- struct stat sb;
- if ( ::stat(path, &sb) == -1 )
- return;
- init(sb);
-}
-
-FileIdTuple::FileIdTuple(const struct stat& sb)
-{
- init(sb);
-}
-
-void FileIdTuple::init(const struct stat& sb)
-{
- memcpy(&fsobjid, &sb.st_ino, 8);
- fsid.val[0] = sb.st_dev;
- fsid.val[1] = 0;
-}
-
-FileIdTuple::FileIdTuple(uint64_t fsidScalar, uint64_t fsobjidScalar) {
- memcpy(&fsid, &fsidScalar, 8);
- memcpy(&fsobjid, &fsobjidScalar, 8);
-}
-
-uint64_t FileIdTuple::inode() const
-{
- uint64_t result;
- memcpy(&result, &fsobjid, 8);
- return result;
-}
-
-uint64_t FileIdTuple::fsID() const
-{
- return fsid.val[0];
-}
-
-FileIdTuple::operator bool() const
-{
- return (fsid.val[0] != 0) && (fsobjid.fid_objno != 0);
-}
-
-bool FileIdTuple::operator==(const FileIdTuple& other) const
-{
- return (fsid.val[0] == other.fsid.val[0]) && (fsid.val[1] == other.fsid.val[1])
- && (fsobjid.fid_objno == other.fsobjid.fid_objno) && (fsobjid.fid_generation == other.fsobjid.fid_generation);
-}
-
-bool FileIdTuple::getPath(char pathBuff[PATH_MAX]) const
-{
- if ( ::fsgetpath(pathBuff, PATH_MAX, (fsid_t*)&fsid, inode()) != -1 )
- return true;
- return false;
-}
-
-#endif // !TARGET_OS_EXCLAVEKIT
-
-#if BUILDING_CACHE_BUILDER || BUILDING_CACHE_BUILDER_UNIT_TESTS
-
-// Helpers to handle the JSON map file
-struct MapFile
-{
- std::string archName;
- std::string platformName;
- std::vector<std::string> imagePaths;
-};
-
-static MapFile parseMapFile(Diagnostics& diags, json::Node& mapNode)
-{
- MapFile mapFile;
-
- // Top level node should be a map of the version and files
- if ( mapNode.map.empty() ) {
- diags.error("Expected map for JSON cache map node\n");
- return { };
- }
-
- // Parse the nodes in the top level manifest node
- const json::Node& versionMapNode = json::getRequiredValue(diags, mapNode, "version");
- uint64_t mapVersion = json::parseRequiredInt(diags, versionMapNode);
- if ( diags.hasError() )
- return { };
-
- const uint64_t supportedMapVersion = 1;
- if ( mapVersion != supportedMapVersion ) {
- diags.error("JSON map version of %lld is unsupported. Supported version is %lld\n",
- mapVersion, supportedMapVersion);
- return { };
- }
-
- // Parse arch if we have it
- if ( const json::Node* archNode = json::getOptionalValue(diags, mapNode, "arch") )
- mapFile.archName = archNode->value;
-
- // Parse arch if we have it
- if ( const json::Node* platformNode = json::getOptionalValue(diags, mapNode, "platform") )
- mapFile.platformName = platformNode->value;
-
- // Parse the images
- const json::Node& imagesNode = json::getRequiredValue(diags, mapNode, "images");
- if ( diags.hasError() )
- return { };
- if ( imagesNode.array.empty() ) {
- diags.error("Images node is not an array\n");
- return { };
- }
-
- for (const json::Node& imageNode : imagesNode.array) {
- const json::Node& pathNode = json::getRequiredValue(diags, imageNode, "path");
- if (pathNode.value.empty()) {
- diags.error("Image path node is not a string\n");
- return { };
- }
- mapFile.imagePaths.push_back(pathNode.value);
- }
-
- return mapFile;
-}
-
-BaselineCachesChecker::BaselineCachesChecker(std::vector<const char*> archs, mach_o::Platform platform)
-{
- this->_archs.insert(this->_archs.end(), archs.begin(), archs.end());
- this->_platform = platform;
-}
-
-mach_o::Error BaselineCachesChecker::addBaselineMap(std::string_view path)
-{
- Diagnostics diags;
- json::Node mapNode = json::readJSON(diags, path.data(), false /* useJSON5 */);
- if ( diags.hasError() )
- return mach_o::Error("%s", diags.errorMessageCStr());
-
- MapFile mapFile = parseMapFile(diags, mapNode);
- if ( diags.hasError() )
- return mach_o::Error("%s", diags.errorMessageCStr());
-
- std::string archName = mapFile.archName;
- if ( mapFile.archName.empty() ) {
- // HACK: Add an arch to the JSON, but for now use the path.
- if ( path.find(".arm64e.") != std::string::npos )
- archName = "arm64e";
- else if ( path.find(".arm64.") != std::string::npos )
- archName = "arm64";
- else if ( path.find(".arm64_32.") != std::string::npos )
- archName = "arm64_32";
- else if ( path.find(".x86_64.") != std::string::npos )
- archName = "x86_64";
- else if ( path.find(".x86_64h.") != std::string::npos )
- archName = "x86_64h";
- }
-
- for ( const std::string& imagePath : mapFile.imagePaths ) {
- this->_unionBaselineDylibs.insert(imagePath);
- if ( !archName.empty() )
- this->_baselineDylibs[archName].push_back(imagePath);
- }
-
- return mach_o::Error::none();
-}
-
-mach_o::Error BaselineCachesChecker::addBaselineMaps(std::string_view dirPath)
-{
- // Make sure the directory exists and is a directory
- {
- struct stat statbuf;
- if ( ::stat(dirPath.data(), &statbuf) )
- return mach_o::Error("stat failed for cache maps path at '%s', due to '%s'", dirPath.data(), strerror(errno));
-
- if ( !S_ISDIR(statbuf.st_mode) )
- return mach_o::Error("cache maps path was not a directory at '%s'", dirPath.data());
- }
-
- // Walk the directory and parse all the JSON files we find
- __block std::vector<std::string> filePaths;
- auto dirFilter = ^(const std::string& path) { return false; };
- auto fileHandler = ^(const std::string& path, const struct stat& statBuf) {
- filePaths.push_back(path);
- };
- iterateDirectoryTree("", dirPath.data(), dirFilter, fileHandler, true /* process files */, false /* recurse */);
-
- if ( filePaths.empty() )
- return mach_o::Error("no files found in cache map directory '%s'", dirPath.data());
-
- for ( std::string_view filePath : filePaths ) {
- if ( !filePath.ends_with(".json") ) {
- fprintf(stderr, "warning: skipping cache map without .json extension: '%s'\n", filePath.data());
- continue;
- }
-
- Diagnostics diags;
- json::Node mapNode = json::readJSON(diags, filePath.data(), false /* useJSON5 */);
- if ( diags.hasError() )
- return mach_o::Error("could not read cache map '%s': '%s'", filePath.data(), diags.errorMessageCStr());
-
- MapFile mapFile = parseMapFile(diags, mapNode);
- if ( diags.hasError() )
- return mach_o::Error("could not parse cache map '%s': '%s'", filePath.data(), diags.errorMessageCStr());
-
- if ( mapFile.archName.empty() )
- return mach_o::Error("cache map does contain an arch '%s'", filePath.data());
-
- if ( mapFile.platformName.empty() )
- return mach_o::Error("cache map does contain a platform '%s'", filePath.data());
-
- if ( mapFile.platformName != this->_platform.name() ) {
- fprintf(stderr, "warning: skipping cache map for different platform (%s vs %s): '%s'\n",
- mapFile.platformName.c_str(), this->_platform.name().c_str(), filePath.data());
- continue;
- }
-
- if ( std::find(this->_archs.begin(), this->_archs.end(), mapFile.archName) == this->_archs.end() ) {
- fprintf(stderr, "warning: skipping cache map for different arch (%s): '%s'\n",
- mapFile.archName.c_str(), filePath.data());
- continue;
- }
-
- printf("found cache map: %s\n", filePath.data());
-
- for ( const std::string& imagePath : mapFile.imagePaths ) {
- this->_unionBaselineDylibs.insert(imagePath);
- this->_baselineDylibs[mapFile.archName].push_back(imagePath);
- }
- }
-
- if ( this->_baselineDylibs.empty() )
- return mach_o::Error("no dylibs found in cache maps in '%s'", dirPath.data());
-
- if ( !allBaselineArchsPresent() )
- return mach_o::Error("missing baseline maps for some archs/platforms '%s'", dirPath.data());
-
- return mach_o::Error::none();
-}
-
-mach_o::Error BaselineCachesChecker::addNewMap(std::string_view mapString)
-{
- Diagnostics diags;
- json::Node mapNode = json::readJSON(diags, mapString.data(), mapString.size(), false /* useJSON5 */);
- if ( diags.hasError() )
- return mach_o::Error("%s", diags.errorMessageCStr());
-
- MapFile mapFile = parseMapFile(diags, mapNode);
- if ( mapFile.archName.empty() )
- return mach_o::Error("expected arch name in cache file map");
-
- for ( const std::string& imagePath : mapFile.imagePaths ) {
- this->_newDylibs[mapFile.archName].insert(imagePath);
- }
-
- return mach_o::Error::none();
-}
-
-void BaselineCachesChecker::setFilesFromNewCaches(std::span<const char* const> files)
-{
- for ( const char* file : files )
- this->_dylibsInNewCaches.insert(file);
-}
-
-bool BaselineCachesChecker::allBaselineArchsPresent() const
-{
- for ( const std::string& arch : this->_archs ) {
- if ( this->_baselineDylibs.find(arch) == this->_baselineDylibs.end() )
- return false;
- }
-
- return true;
-}
-
-std::set<std::string> BaselineCachesChecker::dylibsMissingFromNewCaches() const
-{
- std::set<std::string> result;
-
- // Check if we have map files for all archs we are building.
- // If we have all of them, then we can check them individually, but otherwise
- // we need to union them all to be conservative
- bool checkIndividualMaps = allBaselineArchsPresent();
-
- if ( checkIndividualMaps ) {
- // Walk all the dylibs in the baseline and new caches and compare if anything is missing an arch
- for ( const std::string& arch : this->_archs ) {
- auto baselineIt = this->_baselineDylibs.find(arch);
- auto newIt = this->_newDylibs.find(arch);
- if ( baselineIt == this->_baselineDylibs.end() )
- return { };
- if ( newIt == this->_newDylibs.end() )
- return { };
-
- // If a dylib is in the baseline, but not the corresponding new cache, then we need
- // to add it
- for ( const std::string& imagePath : baselineIt->second ) {
- if ( newIt->second.count(imagePath) == 0 )
- result.insert(imagePath);
- }
- }
- } else {
- // TODO: Remove this old code once we always have an arch name
- std::set<std::string> simulatorSupportDylibs;
- if ( this->_platform == mach_o::Platform::macOS ) {
- //FIXME: We should be using MH_SIM_SUPPORT now that all the relevent binaries include it in their headers
- // macOS has to leave the simulator support binaries on disk
- // It won't put them in the result of getFilesToRemove() so we need to manually add them
- simulatorSupportDylibs.insert("/usr/lib/system/libsystem_kernel.dylib");
- simulatorSupportDylibs.insert("/usr/lib/system/libsystem_platform.dylib");
- simulatorSupportDylibs.insert("/usr/lib/system/libsystem_pthread.dylib");
- }
-
- for (const std::string& baselineDylib : this->_unionBaselineDylibs) {
- if ( !this->_dylibsInNewCaches.count(baselineDylib) && !simulatorSupportDylibs.count(baselineDylib))
- result.insert(baselineDylib);
- }
- }
-
- return result;
-}
-
-#endif // BUILDING_CACHE_BUILDER || BUILDING_CACHE_BUILDER_UNIT_TESTS
-
-static std::span<dyld_cache_mapping_and_slide_info const> slidMappings(const DyldSharedCache* cache)
-{
- const dyld_cache_mapping_and_slide_info* base = (dyld_cache_mapping_and_slide_info*)((uint8_t*)cache + cache->header.mappingWithSlideOffset);
- return { base, cache->header.mappingWithSlideCount };
-}
-
-#if __LP64__
-static void rebaseChainV2(uint8_t* pageContent, uint16_t startOffset, uintptr_t slideAmount, const dyld_cache_slide_info2* 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);
- uintptr_t value = (rawValue & valueMask);
- if ( value != 0 ) {
- value += valueAdd;
- value += slideAmount;
- }
- *((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);
- pageOffset += delta;
- }
-}
-#endif
-
-
-#if !__LP64__ || BUILDING_CACHE_BUILDER_UNIT_TESTS
-static void rebaseChainV4(uint8_t* pageContent, uint16_t startOffset, uintptr_t slideAmount, 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);
- uintptr_t value = (rawValue & valueMask);
- if ( (value & 0xFFFF8000) == 0 ) {
- // small positive non-pointer, use as-is
- }
- else if ( (value & 0x3FFF8000) == 0x3FFF8000 ) {
- // small negative non-pointer
- value |= 0xC0000000;
- }
- else {
- value += valueAdd;
- value += slideAmount;
- }
- *((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);
- pageOffset += delta;
- }
-}
-#endif
-
-// fixup (rebase and potentially authenticate) a specific DATA/AUTH mapping
-static mach_o::Error fixupDataPages(const dyld_cache_slide_info* slideInfo, uint8_t* dataPagesStart, intptr_t slide)
-{
- const dyld_cache_slide_info* slideInfoHeader = slideInfo;
- if ( slideInfoHeader == nullptr )
- return mach_o::Error::none();
-
-#if !__LP64__ || BUILDING_CACHE_BUILDER_UNIT_TESTS
- if ( slideInfoHeader->version == 1 ) {
- const dyld_cache_slide_info* slideHeader = (dyld_cache_slide_info*)slideInfo;
- const uint32_t page_size = 4096;
-
- const dyld_cache_slide_info_entry* entries = (dyld_cache_slide_info_entry*)((char*)slideHeader + slideHeader->entries_offset);
- const uint16_t* tocs = (uint16_t*)((char*)slideHeader + slideHeader->toc_offset);
- for(int i=0; i < slideHeader->toc_count; ++i) {
- const dyld_cache_slide_info_entry* entry = &entries[tocs[i]];
- uint8_t* page = (uint8_t*)(long)(dataPagesStart + (page_size * i));
- for(int j = 0; j < slideHeader->entries_size; ++j) {
- uint8_t bitmask = entry->bits[j];
- for (unsigned k = 0; k != 8; ++k) {
- if ( bitmask & (1 << k) ) {
- uint32_t pageOffset = ((j * 8) + k) * 4;
- uint32_t* loc = (uint32_t*)(page + pageOffset);
- *loc = *loc + (int32_t)slide;
- }
- }
- }
- }
- return mach_o::Error::none();
- }
-
- if ( slideInfoHeader->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, slide, 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, slide, slideHeader);
- }
- }
- return mach_o::Error::none();
- }
-#endif
-
-#if __LP64__
- if ( slideInfoHeader->version == 2 ) {
- const dyld_cache_slide_info2* slideHeader = (dyld_cache_slide_info2*)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];
- //dyld4::log("page[%d]: page_starts[i]=0x%04X\n", i, pageEntry);
- if ( pageEntry == DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE )
- continue;
- if ( pageEntry & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA ) {
- uint16_t chainIndex = (pageEntry & 0x3FFF);
- bool done = false;
- while ( !done ) {
- uint16_t pInfo = page_extras[chainIndex];
- uint16_t pageStartOffset = (pInfo & 0x3FFF)*4;
- //dyld4::log(" chain[%d] pageOffset=0x%03X\n", chainIndex, pageStartOffset);
- rebaseChainV2(page, pageStartOffset, slide, slideHeader);
- done = (pInfo & DYLD_CACHE_SLIDE_PAGE_ATTR_END);
- ++chainIndex;
- }
- }
- else {
- uint32_t pageOffset = pageEntry * 4;
- //dyld::log(" start pageOffset=0x%03X\n", pageOffset);
- rebaseChainV2(page, pageOffset, slide, slideHeader);
- }
- }
- return mach_o::Error::none();
- }
-
- if ( slideInfoHeader->version == 3 ) {
-#if __has_feature(ptrauth_calls) || BUILDING_CACHE_BUILDER_UNIT_TESTS
- const dyld_cache_slide_info3* slideHeader = (dyld_cache_slide_info3*)slideInfo;
- const uint32_t pageSize = slideHeader->page_size;
- for (int i=0; i < slideHeader->page_starts_count; ++i) {
- uint8_t* page = (uint8_t*)(dataPagesStart + (pageSize*i));
- uint64_t delta = slideHeader->page_starts[i];
- //dyld::log("page[%d]: page_starts[i]=0x%04X\n", i, delta);
- if ( delta == DYLD_CACHE_SLIDE_V3_PAGE_ATTR_NO_REBASE )
- continue;
- delta = delta/sizeof(uint64_t); // initial offset is byte based
- dyld_cache_slide_pointer3* loc = (dyld_cache_slide_pointer3*)page;
- do {
- loc += delta;
- delta = loc->plain.offsetToNextPointer;
- if ( loc->auth.authenticated ) {
- uint64_t target = slideHeader->auth_value_add + loc->auth.offsetFromSharedCacheBase + slide;
- MachOLoaded::ChainedFixupPointerOnDisk ptr;
- ptr.raw64 = *((uint64_t*)loc);
-#if BUILDING_DYLD
- // only sign pointers in dyld
- loc->raw = ptr.arm64e.signPointer(loc, target);
-#else
- loc->raw = target;
-#endif // BUILDING_DYLD
- }
- else {
- MachOLoaded::ChainedFixupPointerOnDisk ptr;
- ptr.raw64 = *((uint64_t*)loc);
- loc->raw = ptr.arm64e.unpackTarget() + slide;
- }
- } while (delta != 0);
- }
- return mach_o::Error::none();
-#else
- return mach_o::Error("invalid pointer kind in cache file");
-#endif // __has_feature(ptrauth_calls) || BUILDING_CACHE_BUILDER_UNIT_TESTS
- }
-
- if ( slideInfoHeader->version == 5 ) {
-#if __has_feature(ptrauth_calls) || BUILDING_CACHE_BUILDER_UNIT_TESTS
- const dyld_cache_slide_info5* slideHeader = (dyld_cache_slide_info5*)slideInfo;
- const uint32_t pageSize = slideHeader->page_size;
- for (int i=0; i < slideHeader->page_starts_count; ++i) {
- uint8_t* page = (uint8_t*)(dataPagesStart + (pageSize*i));
- uint64_t delta = slideHeader->page_starts[i];
- //dyld4::console("page[%d]: page_starts[i]=0x%04llX\n", i, delta);
- if ( delta == DYLD_CACHE_SLIDE_V5_PAGE_ATTR_NO_REBASE )
- continue;
- delta = delta/sizeof(uint64_t); // initial offset is byte based
- dyld_cache_slide_pointer5* loc = (dyld_cache_slide_pointer5*)page;
- do {
- loc += delta;
- delta = loc->regular.next;
-
- MachOLoaded::ChainedFixupPointerOnDisk ptr;
- ptr.raw64 = *((uint64_t*)loc);
-
- uint64_t target = slideHeader->value_add + loc->regular.runtimeOffset + slide;
- if ( loc->auth.auth ) {
-#if BUILDING_DYLD
- // only sign pointers in dyld
- loc->raw = ptr.cache64e.signPointer(loc, target);
-#else
- loc->raw = target;
-#endif // BUILDING_DYLD
- } else {
- loc->raw = target | ptr.cache64e.high8();
- }
- } while (delta != 0);
- }
- return mach_o::Error::none();
-#else
- return mach_o::Error("invalid pointer kind in cache file");
-#endif // __has_feature(ptrauth_calls) || BUILDING_CACHE_BUILDER_UNIT_TESTS
- }
-#endif // LP64
-
- return mach_o::Error("invalid slide info in cache file");
-}
-
-mach_o::Error DyldSharedCache::fixupDataPages(intptr_t slideToApply) const
-{
- std::span<dyld_cache_mapping_and_slide_info const> mappings = slidMappings(this);
-
- // Nothing to do if we only have 1 mapping, as that means we are only TEXT or only LINKEDIT
- if ( mappings.size() == 1 )
- return mach_o::Error::none();
-
- // LINEKDIT must be last
- const dyld_cache_mapping_and_slide_info& linkeditMapping = mappings.back();
-
- for ( const dyld_cache_mapping_and_slide_info& mapping : mappings ) {
- if ( mapping.slideInfoFileSize == 0 )
- continue;
-
- // slide info is relative to where linkedit was mapped
- uint64_t slideInfoLinkeditOffset = mapping.slideInfoFileOffset - linkeditMapping.fileOffset;
- uint64_t slideInfoAddr = linkeditMapping.address + slideInfoLinkeditOffset;
- const dyld_cache_slide_info* slideInfo = (const dyld_cache_slide_info*)(slideInfoAddr + slide());
- uint8_t* dataPages = (uint8_t*)(mapping.address + slide());
-
- if ( mach_o::Error err = ::fixupDataPages(slideInfo, dataPages, slideToApply) )
- return err;
- }
-
- return mach_o::Error::none();
-}
-
-mach_o::Error DyldSharedCache::fixupAllDataPages(intptr_t slideToApply) const
-{
- // Fix up the pages in all subcaches
- __block mach_o::Error err = mach_o::Error::none();
- forEachCache(^(const DyldSharedCache* cache, bool& stopCache) {
- if ( mach_o::Error cacheErr = cache->fixupDataPages(slideToApply) ) {
- err = std::move(cacheErr);
- stopCache = true;
- return;
- }
- });
-
- return std::move(err);
-}