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--- dyld/dyld-832.7.3/dyld3/shared-cache/CacheBuilder.cpp
+++ dyld/dyld-635.2/dyld3/shared-cache/CacheBuilder.cpp
@@ -22,24 +22,108 @@
* @APPLE_LICENSE_HEADER_END@
*/
+
+#include <unistd.h>
+#include <dirent.h>
+#include <sys/errno.h>
+#include <sys/fcntl.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <mach/mach.h>
+#include <mach/mach_time.h>
+#include <mach/mach_vm.h>
+#include <mach-o/loader.h>
+#include <mach-o/fat.h>
+#include <mach/shared_region.h>
#include <assert.h>
+#include <CommonCrypto/CommonHMAC.h>
+#include <CommonCrypto/CommonDigest.h>
+#include <CommonCrypto/CommonDigestSPI.h>
+#include <pthread/pthread.h>
+
+#include <string>
+#include <vector>
+#include <unordered_map>
+#include <unordered_set>
#include "MachOFileAbstraction.hpp"
+#include "CodeSigningTypes.h"
#include "DyldSharedCache.h"
#include "CacheBuilder.h"
+#include "FileAbstraction.hpp"
+#include "Trie.hpp"
+#include "FileUtils.h"
#include "Diagnostics.h"
-#include "IMPCaches.hpp"
+#include "ClosureBuilder.h"
+#include "Closure.h"
+#include "StringUtils.h"
+
+#if __has_include("dyld_cache_config.h")
+ #include "dyld_cache_config.h"
+#else
+ #define ARM_SHARED_REGION_START 0x1A000000ULL
+ #define ARM_SHARED_REGION_SIZE 0x26000000ULL
+ #define ARM64_SHARED_REGION_START 0x180000000ULL
+ #define ARM64_SHARED_REGION_SIZE 0x40000000ULL
+#endif
+
+#ifndef ARM64_32_SHARED_REGION_START
+ #define ARM64_32_SHARED_REGION_START 0x1A000000ULL
+ #define ARM64_32_SHARED_REGION_SIZE 0x26000000ULL
+#endif
+
+const CacheBuilder::ArchLayout CacheBuilder::_s_archLayout[] = {
+ { 0x7FFF20000000ULL, 0xEFE00000ULL, 0x40000000, 0xFFFF000000000000, "x86_64", 0, 0, 0, 12, 2, true, true },
+ { 0x7FFF20000000ULL, 0xEFE00000ULL, 0x40000000, 0xFFFF000000000000, "x86_64h", 0, 0, 0, 12, 2, true, true },
+ { SHARED_REGION_BASE_I386, SHARED_REGION_SIZE_I386, 0x00200000, 0x0, "i386", 0, 0, 0, 12, 0, false, false },
+ { ARM64_SHARED_REGION_START, ARM64_SHARED_REGION_SIZE, 0x02000000, 0x00FFFF0000000000, "arm64", 0x0000C000, 0x00100000, 0x07F00000, 14, 2, false, true },
+#if SUPPORT_ARCH_arm64e
+ { ARM64_SHARED_REGION_START, ARM64_SHARED_REGION_SIZE, 0x02000000, 0x00FFFF0000000000, "arm64e", 0x0000C000, 0x00100000, 0x07F00000, 14, 2, false, true },
+#endif
+#if SUPPORT_ARCH_arm64_32
+ { ARM64_32_SHARED_REGION_START, ARM64_32_SHARED_REGION_SIZE,0x02000000, 0xC0000000, "arm64_32",0x0000C000, 0x00100000, 0x07F00000, 14, 6, false, false },
+#endif
+ { ARM_SHARED_REGION_START, ARM_SHARED_REGION_SIZE, 0x02000000, 0xE0000000, "armv7s", 0, 0, 0, 14, 4, false, false },
+ { ARM_SHARED_REGION_START, ARM_SHARED_REGION_SIZE, 0x00400000, 0xE0000000, "armv7k", 0, 0, 0, 14, 4, false, false },
+ { 0x40000000, 0x40000000, 0x02000000, 0x0, "sim-x86", 0, 0, 0, 14, 0, false, false }
+};
+
+
+// These are dylibs that may be interposed, so stubs calling into them should never be bypassed
+const char* const CacheBuilder::_s_neverStubEliminate[] = {
+ "/usr/lib/system/libdispatch.dylib",
+ nullptr
+};
+
CacheBuilder::CacheBuilder(const DyldSharedCache::CreateOptions& options, const dyld3::closure::FileSystem& fileSystem)
: _options(options)
, _fileSystem(fileSystem)
, _fullAllocatedBuffer(0)
, _diagnostics(options.loggingPrefix, options.verbose)
+ , _archLayout(nullptr)
+ , _aliasCount(0)
+ , _slideInfoFileOffset(0)
+ , _slideInfoBufferSizeAllocated(0)
, _allocatedBufferSize(0)
-{
-}
-
-CacheBuilder::~CacheBuilder() {
+ , _branchPoolsLinkEditStartAddr(0)
+{
+
+ std::string targetArch = options.archName;
+ if ( options.forSimulator && (options.archName == "i386") )
+ targetArch = "sim-x86";
+
+ for (const ArchLayout& layout : _s_archLayout) {
+ if ( layout.archName == targetArch ) {
+ _archLayout = &layout;
+ break;
+ }
+ }
+
+ if (!_archLayout) {
+ _diagnostics.error("Tool was built without support for: '%s'", targetArch.c_str());
+ }
}
@@ -48,767 +132,2601 @@
return _diagnostics.errorMessage();
}
+const std::set<std::string> CacheBuilder::warnings()
+{
+ return _diagnostics.warnings();
+}
+
+const std::set<const dyld3::MachOAnalyzer*> CacheBuilder::evictions()
+{
+ return _evictions;
+}
+
+void CacheBuilder::deleteBuffer()
+{
+ vm_deallocate(mach_task_self(), _fullAllocatedBuffer, _archLayout->sharedMemorySize);
+ _fullAllocatedBuffer = 0;
+ _allocatedBufferSize = 0;
+}
+
+
+void CacheBuilder::makeSortedDylibs(const std::vector<LoadedMachO>& dylibs, const std::unordered_map<std::string, unsigned> sortOrder)
+{
+ for (const LoadedMachO& dylib : dylibs) {
+ _sortedDylibs.push_back({ &dylib, dylib.mappedFile.runtimePath, {} });
+ }
+
+ std::sort(_sortedDylibs.begin(), _sortedDylibs.end(), [&](const DylibInfo& a, const DylibInfo& b) {
+ const auto& orderA = sortOrder.find(a.input->mappedFile.runtimePath);
+ const auto& orderB = sortOrder.find(b.input->mappedFile.runtimePath);
+ bool foundA = (orderA != sortOrder.end());
+ bool foundB = (orderB != sortOrder.end());
+
+ // Order all __DATA_DIRTY segments specified in the order file first, in
+ // the order specified in the file, followed by any other __DATA_DIRTY
+ // segments in lexicographic order.
+ if ( foundA && foundB )
+ return orderA->second < orderB->second;
+ else if ( foundA )
+ return true;
+ else if ( foundB )
+ return false;
+ else
+ return a.input->mappedFile.runtimePath < b.input->mappedFile.runtimePath;
+ });
+}
+
+
+inline uint32_t absolutetime_to_milliseconds(uint64_t abstime)
+{
+ return (uint32_t)(abstime/1000/1000);
+}
+
+struct DylibAndSize
+{
+ const CacheBuilder::LoadedMachO* input;
+ const char* installName;
+ uint64_t size;
+};
+
+uint64_t CacheBuilder::cacheOverflowAmount()
+{
+ if ( _archLayout->sharedRegionsAreDiscontiguous ) {
+ // for macOS x86_64 cache, need to check each region for overflow
+ if ( _readExecuteRegion.sizeInUse > 0x60000000 )
+ return (_readExecuteRegion.sizeInUse - 0x60000000);
+
+ if ( _readWriteRegion.sizeInUse > 0x40000000 )
+ return (_readWriteRegion.sizeInUse - 0x40000000);
+
+ if ( _readOnlyRegion.sizeInUse > 0x3FE00000 )
+ return (_readOnlyRegion.sizeInUse - 0x3FE00000);
+ }
+ else {
+ bool alreadyOptimized = (_readOnlyRegion.sizeInUse != _readOnlyRegion.bufferSize);
+ uint64_t vmSize = _readOnlyRegion.unslidLoadAddress - _readExecuteRegion.unslidLoadAddress;
+ if ( alreadyOptimized )
+ vmSize += _readOnlyRegion.sizeInUse;
+ else if ( _options.excludeLocalSymbols )
+ vmSize += (_readOnlyRegion.sizeInUse * 37/100); // assume locals removal and LINKEDIT optimzation reduces LINKEDITs %25 of original size
+ else
+ vmSize += (_readOnlyRegion.sizeInUse * 80/100); // assume LINKEDIT optimzation reduces LINKEDITs to %80 of original size
+ if ( vmSize > _archLayout->sharedMemorySize )
+ return vmSize - _archLayout->sharedMemorySize;
+ }
+ // fits in shared region
+ return 0;
+}
+
+size_t CacheBuilder::evictLeafDylibs(uint64_t reductionTarget, std::vector<const LoadedMachO*>& overflowDylibs)
+{
+ // build count of how many references there are to each dylib
+ __block std::map<std::string, unsigned int> referenceCount;
+ for (const DylibInfo& dylib : _sortedDylibs) {
+ dylib.input->mappedFile.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool &stop) {
+ referenceCount[loadPath] += 1;
+ });
+ }
+
+ // find all dylibs not referenced
+ std::vector<DylibAndSize> unreferencedDylibs;
+ for (const DylibInfo& dylib : _sortedDylibs) {
+ const char* installName = dylib.input->mappedFile.mh->installName();
+ if ( referenceCount.count(installName) == 0 ) {
+ // conservative: sum up all segments except LINKEDIT
+ __block uint64_t segsSize = 0;
+ dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& info, bool& stop) {
+ if ( strcmp(info.segName, "__LINKEDIT") != 0 )
+ segsSize += info.vmSize;
+ });
+ unreferencedDylibs.push_back({ dylib.input, installName, segsSize });
+ }
+ }
+ // sort leaf dylibs by size
+ std::sort(unreferencedDylibs.begin(), unreferencedDylibs.end(), [&](const DylibAndSize& a, const DylibAndSize& b) {
+ return ( a.size > b.size );
+ });
+
+ // build set of dylibs that if removed will allow cache to build
+ for (DylibAndSize& dylib : unreferencedDylibs) {
+ if ( _options.verbose )
+ _diagnostics.warning("to prevent cache overflow, not caching %s", dylib.installName);
+ _evictions.insert(dylib.input->mappedFile.mh);
+ // Track the evicted dylibs so we can try build "other" dlopen closures for them.
+ overflowDylibs.push_back(dylib.input);
+ if ( dylib.size > reductionTarget )
+ break;
+ reductionTarget -= dylib.size;
+ }
+
+ // prune _sortedDylibs
+ _sortedDylibs.erase(std::remove_if(_sortedDylibs.begin(), _sortedDylibs.end(), [&](const DylibInfo& dylib) {
+ return (_evictions.count(dylib.input->mappedFile.mh) != 0);
+ }),_sortedDylibs.end());
+
+ return _evictions.size();
+}
+
+// Handles building a list of input files to the CacheBuilder itself.
+class CacheInputBuilder {
+public:
+ CacheInputBuilder(const dyld3::closure::FileSystem& fileSystem,
+ std::string reqArchitecture, dyld3::Platform reqPlatform)
+ : fileSystem(fileSystem), reqArchitecture(reqArchitecture), reqPlatform(reqPlatform) { }
+
+ // Loads and maps any MachOs in the given list of files.
+ void loadMachOs(std::vector<CacheBuilder::InputFile>& inputFiles,
+ std::vector<CacheBuilder::LoadedMachO>& dylibsToCache,
+ std::vector<CacheBuilder::LoadedMachO>& otherDylibs,
+ std::vector<CacheBuilder::LoadedMachO>& executables,
+ std::vector<CacheBuilder::LoadedMachO>& couldNotLoadFiles) {
+
+ std::map<std::string, uint64_t> dylibInstallNameMap;
+ for (CacheBuilder::InputFile& inputFile : inputFiles) {
+ dyld3::closure::LoadedFileInfo loadedFileInfo = dyld3::MachOAnalyzer::load(inputFile.diag, fileSystem, inputFile.path, reqArchitecture.c_str(), reqPlatform);
+ const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)loadedFileInfo.fileContent;
+ if (ma == nullptr) {
+ couldNotLoadFiles.emplace_back((CacheBuilder::LoadedMachO){ DyldSharedCache::MappedMachO(), loadedFileInfo, &inputFile });
+ continue;
+ }
+
+ DyldSharedCache::MappedMachO mappedFile(inputFile.path, ma, loadedFileInfo.sliceLen, false, false,
+ loadedFileInfo.sliceOffset, loadedFileInfo.mtime, loadedFileInfo.inode);
+
+ // The file can be loaded with the given slice, but we may still want to exlude it from the cache.
+ if (ma->isDylib()) {
+ std::string installName = ma->installName();
+
+ // Let the platform exclude the file before we do anything else.
+ if (platformExcludesInstallName(installName)) {
+ inputFile.diag.verbose("Platform excluded file\n");
+ fileSystem.unloadFile(loadedFileInfo);
+ continue;
+ }
+
+ if (!ma->canBePlacedInDyldCache(inputFile.path, ^(const char* msg) {
+ inputFile.diag.warning("Dylib located at '%s' cannot be placed in cache because: %s", inputFile.path, msg);
+ })) {
+ // TODO: Add exclusion lists here?
+ // Probably not as we already applied the dylib exclusion list.
+ otherDylibs.emplace_back((CacheBuilder::LoadedMachO){ mappedFile, loadedFileInfo, &inputFile });
+ continue;
+ }
+
+ // Otherwise see if we have another file with this install name
+ auto iteratorAndInserted = dylibInstallNameMap.insert(std::make_pair(installName, dylibsToCache.size()));
+ if (iteratorAndInserted.second) {
+ // We inserted the dylib so we haven't seen another with this name.
+ if (installName[0] != '@' && installName != inputFile.path) {
+ inputFile.diag.warning("Dylib located at '%s' has installname '%s'", inputFile.path, installName.c_str());
+ }
+
+ dylibsToCache.emplace_back((CacheBuilder::LoadedMachO){ mappedFile, loadedFileInfo, &inputFile });
+ } else {
+ // We didn't insert this one so we've seen it before.
+ CacheBuilder::LoadedMachO& previousLoadedMachO = dylibsToCache[iteratorAndInserted.first->second];
+ inputFile.diag.warning("Multiple dylibs claim installname '%s' ('%s' and '%s')", installName.c_str(), inputFile.path, previousLoadedMachO.mappedFile.runtimePath.c_str());
+
+ // This is the "Good" one, overwrite
+ if (inputFile.path == installName) {
+ // Unload the old one
+ fileSystem.unloadFile(previousLoadedMachO.loadedFileInfo);
+
+ // And replace with this one.
+ previousLoadedMachO.mappedFile = mappedFile;
+ previousLoadedMachO.loadedFileInfo = loadedFileInfo;
+ }
+ }
+ } else if (ma->isBundle()) {
+ // TODO: Add exclusion lists here?
+ otherDylibs.emplace_back((CacheBuilder::LoadedMachO){ mappedFile, loadedFileInfo, &inputFile });
+ } else if (ma->isDynamicExecutable()) {
+ if (platformExcludesExecutablePath_macOS(inputFile.path)) {
+ inputFile.diag.verbose("Platform excluded file\n");
+ fileSystem.unloadFile(loadedFileInfo);
+ continue;
+ }
+ executables.emplace_back((CacheBuilder::LoadedMachO){ mappedFile, loadedFileInfo, &inputFile });
+ } else {
+ inputFile.diag.verbose("Unsupported mach file type\n");
+ fileSystem.unloadFile(loadedFileInfo);
+ }
+ }
+ }
+
+private:
+
+
+
+ static bool platformExcludesInstallName_macOS(const std::string& installName) {
+ return false;
+ }
+
+ static bool platformExcludesInstallName_iOS(const std::string& installName) {
+ if ( installName == "/System/Library/Caches/com.apple.xpc/sdk.dylib" )
+ return true;
+ if ( installName == "/System/Library/Caches/com.apple.xpcd/xpcd_cache.dylib" )
+ return true;
+ return false;
+ }
+
+ static bool platformExcludesInstallName_tvOS(const std::string& installName) {
+ return platformExcludesInstallName_iOS(installName);
+ }
+
+ static bool platformExcludesInstallName_watchOS(const std::string& installName) {
+ return platformExcludesInstallName_iOS(installName);
+ }
+
+ static bool platformExcludesInstallName_bridgeOS(const std::string& installName) {
+ return platformExcludesInstallName_iOS(installName);
+ }
+
+ // Returns true if the current platform requires that this install name be excluded from the shared cache
+ // Note that this overrides any exclusion from anywhere else.
+ bool platformExcludesInstallName(const std::string& installName) {
+ switch (reqPlatform) {
+ case dyld3::Platform::unknown:
+ return false;
+ case dyld3::Platform::macOS:
+ return platformExcludesInstallName_macOS(installName);
+ case dyld3::Platform::iOS:
+ return platformExcludesInstallName_iOS(installName);
+ case dyld3::Platform::tvOS:
+ return platformExcludesInstallName_tvOS(installName);
+ case dyld3::Platform::watchOS:
+ return platformExcludesInstallName_watchOS(installName);
+ case dyld3::Platform::bridgeOS:
+ return platformExcludesInstallName_bridgeOS(installName);
+ case dyld3::Platform::iOSMac:
+ return false;
+ case dyld3::Platform::iOS_simulator:
+ return false;
+ case dyld3::Platform::tvOS_simulator:
+ return false;
+ case dyld3::Platform::watchOS_simulator:
+ return false;
+ }
+ }
+
+
+
+
+ static bool platformExcludesExecutablePath_macOS(const std::string& path) {
+ return false;
+ }
+
+ static bool platformExcludesExecutablePath_iOS(const std::string& path) {
+ //HACK exclude all launchd and installd variants until we can do something about xpcd_cache.dylib and friends
+ if (path == "/sbin/launchd"
+ || path == "/usr/local/sbin/launchd.debug"
+ || path == "/usr/local/sbin/launchd.development"
+ || path == "/usr/libexec/installd") {
+ return true;
+ }
+ return false;
+ }
+
+ static bool platformExcludesExecutablePath_tvOS(const std::string& path) {
+ return platformExcludesExecutablePath_iOS(path);
+ }
+
+ static bool platformExcludesExecutablePath_watchOS(const std::string& path) {
+ return platformExcludesExecutablePath_iOS(path);
+ }
+
+ static bool platformExcludesExecutablePath_bridgeOS(const std::string& path) {
+ return platformExcludesExecutablePath_iOS(path);
+ }
+
+ // Returns true if the current platform requires that this path be excluded from the shared cache
+ // Note that this overrides any exclusion from anywhere else.
+ bool platformExcludesExecutablePath(const std::string& path) {
+ switch (reqPlatform) {
+ case dyld3::Platform::unknown:
+ return false;
+ case dyld3::Platform::macOS:
+ return platformExcludesExecutablePath_macOS(path);
+ case dyld3::Platform::iOS:
+ return platformExcludesExecutablePath_iOS(path);
+ case dyld3::Platform::tvOS:
+ return platformExcludesExecutablePath_tvOS(path);
+ case dyld3::Platform::watchOS:
+ return platformExcludesExecutablePath_watchOS(path);
+ case dyld3::Platform::bridgeOS:
+ return platformExcludesExecutablePath_bridgeOS(path);
+ case dyld3::Platform::iOSMac:
+ return false;
+ case dyld3::Platform::iOS_simulator:
+ return false;
+ case dyld3::Platform::tvOS_simulator:
+ return false;
+ case dyld3::Platform::watchOS_simulator:
+ return false;
+ }
+ }
+
+ const dyld3::closure::FileSystem& fileSystem;
+ std::string reqArchitecture;
+ dyld3::Platform reqPlatform;
+};
+
+static void verifySelfContained(std::vector<CacheBuilder::LoadedMachO>& dylibsToCache,
+ std::vector<CacheBuilder::LoadedMachO>& otherDylibs,
+ std::vector<CacheBuilder::LoadedMachO>& couldNotLoadFiles)
+{
+ // build map of dylibs
+ __block std::map<std::string, const CacheBuilder::LoadedMachO*> knownDylibs;
+ __block std::map<std::string, const CacheBuilder::LoadedMachO*> allDylibs;
+ for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) {
+ knownDylibs.insert({ dylib.mappedFile.runtimePath, &dylib });
+ allDylibs.insert({ dylib.mappedFile.runtimePath, &dylib });
+ if (const char* installName = dylib.mappedFile.mh->installName()) {
+ knownDylibs.insert({ installName, &dylib });
+ allDylibs.insert({ installName, &dylib });
+ }
+ }
+
+ for (const CacheBuilder::LoadedMachO& dylib : otherDylibs) {
+ allDylibs.insert({ dylib.mappedFile.runtimePath, &dylib });
+ if (const char* installName = dylib.mappedFile.mh->installName())
+ allDylibs.insert({ installName, &dylib });
+ }
+
+ for (const CacheBuilder::LoadedMachO& dylib : couldNotLoadFiles) {
+ allDylibs.insert({ dylib.inputFile->path, &dylib });
+ }
+
+ // check all dependencies to assure every dylib in cache only depends on other dylibs in cache
+ __block std::map<std::string, std::set<std::string>> badDylibs;
+ __block bool doAgain = true;
+ while ( doAgain ) {
+ doAgain = false;
+ // scan dylib list making sure all dependents are in dylib list
+ for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) {
+ if ( badDylibs.count(dylib.mappedFile.runtimePath) != 0 )
+ continue;
+ dylib.mappedFile.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
+ if (isWeak)
+ return;
+ if ( knownDylibs.count(loadPath) == 0 ) {
+ badDylibs[dylib.mappedFile.runtimePath].insert(std::string("Could not find dependency '") + loadPath + "'");
+ knownDylibs.erase(dylib.mappedFile.runtimePath);
+ knownDylibs.erase(dylib.mappedFile.mh->installName());
+ doAgain = true;
+ }
+ });
+ }
+ }
+
+ // Now walk the dylibs which depend on missing dylibs and see if any of them are required binaries.
+ for (auto badDylibsIterator : badDylibs) {
+ const std::string& dylibRuntimePath = badDylibsIterator.first;
+ auto requiredDylibIterator = allDylibs.find(dylibRuntimePath);
+ if (requiredDylibIterator == allDylibs.end())
+ continue;
+ if (!requiredDylibIterator->second->inputFile->mustBeIncluded())
+ continue;
+ // This dylib is required so mark all dependencies as requried too
+ __block std::vector<const CacheBuilder::LoadedMachO*> worklist;
+ worklist.push_back(requiredDylibIterator->second);
+ while (!worklist.empty()) {
+ const CacheBuilder::LoadedMachO* dylib = worklist.back();
+ worklist.pop_back();
+ if (!dylib->mappedFile.mh)
+ continue;
+ dylib->mappedFile.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
+ if (isWeak)
+ return;
+ auto dylibIterator = allDylibs.find(loadPath);
+ if (dylibIterator != allDylibs.end()) {
+ if (dylibIterator->second->inputFile->state == CacheBuilder::InputFile::Unset) {
+ dylibIterator->second->inputFile->state = CacheBuilder::InputFile::MustBeIncludedForDependent;
+ worklist.push_back(dylibIterator->second);
+ }
+ }
+ });
+ }
+ }
+
+ // FIXME: Make this an option we can pass in
+ const bool evictLeafDylibs = true;
+ if (evictLeafDylibs) {
+ doAgain = true;
+ while ( doAgain ) {
+ doAgain = false;
+
+ // build count of how many references there are to each dylib
+ __block std::set<std::string> referencedDylibs;
+ for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) {
+ if ( badDylibs.count(dylib.mappedFile.runtimePath) != 0 )
+ continue;
+ dylib.mappedFile.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool &stop) {
+ referencedDylibs.insert(loadPath);
+ });
+ }
+
+ // find all dylibs not referenced
+ std::vector<DylibAndSize> unreferencedDylibs;
+ for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) {
+ if ( badDylibs.count(dylib.mappedFile.runtimePath) != 0 )
+ continue;
+ const char* installName = dylib.mappedFile.mh->installName();
+ if ( (referencedDylibs.count(installName) == 0) && (dylib.inputFile->state == CacheBuilder::InputFile::MustBeExcludedIfUnused) ) {
+ badDylibs[dylib.mappedFile.runtimePath].insert(std::string("It has been explicitly excluded as it is unused"));
+ doAgain = true;
+ }
+ }
+ }
+ }
+
+ // Move bad dylibs from dylibs to cache to other dylibs.
+ for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) {
+ auto i = badDylibs.find(dylib.mappedFile.runtimePath);
+ if ( i != badDylibs.end()) {
+ otherDylibs.push_back(dylib);
+ for (const std::string& reason : i->second )
+ otherDylibs.back().inputFile->diag.warning("Dylib located at '%s' not placed in shared cache because: %s", dylib.mappedFile.runtimePath.c_str(), reason.c_str());
+ }
+ }
+
+ const auto& badDylibsLambdaRef = badDylibs;
+ dylibsToCache.erase(std::remove_if(dylibsToCache.begin(), dylibsToCache.end(), [&](const CacheBuilder::LoadedMachO& dylib) {
+ if (badDylibsLambdaRef.find(dylib.mappedFile.runtimePath) != badDylibsLambdaRef.end())
+ return true;
+ return false;
+ }), dylibsToCache.end());
+}
+
+// This is the new build API which takes the raw files (which could be FAT) and tries to build a cache from them.
+// We should remove the other build() method, or make it private so that this can wrap it.
+void CacheBuilder::build(std::vector<CacheBuilder::InputFile>& inputFiles,
+ std::vector<DyldSharedCache::FileAlias>& aliases) {
+ // First filter down to files which are actually MachO's
+ CacheInputBuilder cacheInputBuilder(_fileSystem, _archLayout->archName, _options.platform);
+
+ std::vector<LoadedMachO> dylibsToCache;
+ std::vector<LoadedMachO> otherDylibs;
+ std::vector<LoadedMachO> executables;
+ std::vector<LoadedMachO> couldNotLoadFiles;
+ cacheInputBuilder.loadMachOs(inputFiles, dylibsToCache, otherDylibs, executables, couldNotLoadFiles);
+
+ verifySelfContained(dylibsToCache, otherDylibs, couldNotLoadFiles);
+
+ // Check for required binaries before we try to build the cache
+ if (!_diagnostics.hasError()) {
+ // If we succeeded in building, then now see if there was a missing required file, and if so why its missing.
+ std::string errorString;
+ for (const LoadedMachO& dylib : otherDylibs) {
+ if (dylib.inputFile->mustBeIncluded()) {
+ // An error loading a required file must be propagated up to the top level diagnostic handler.
+ bool gotWarning = false;
+ for (const std::string& warning : dylib.inputFile->diag.warnings()) {
+ gotWarning = true;
+ std::string message = warning;
+ if (message.back() == '\n')
+ message.pop_back();
+ if (!errorString.empty())
+ errorString += "ERROR: ";
+ errorString += "Required binary was not included in the shared cache '" + std::string(dylib.inputFile->path) + "' because: " + message + "\n";
+ }
+ if (!gotWarning) {
+ if (!errorString.empty())
+ errorString += "ERROR: ";
+ errorString += "Required binary was not included in the shared cache '" + std::string(dylib.inputFile->path) + "' because: 'unknown error. Please report to dyld'\n";
+ }
+ }
+ }
+ for (const LoadedMachO& dylib : couldNotLoadFiles) {
+ if (dylib.inputFile->mustBeIncluded()) {
+ if (dylib.inputFile->diag.hasError()) {
+ if (!errorString.empty())
+ errorString += "ERROR: ";
+ errorString += "Required binary was not included in the shared cache '" + std::string(dylib.inputFile->path) + "' because: " + dylib.inputFile->diag.errorMessage() + "\n";
+ } else {
+ if (!errorString.empty())
+ errorString += "ERROR: ";
+ errorString += "Required binary was not included in the shared cache '" + std::string(dylib.inputFile->path) + "' because: 'unknown error. Please report to dyld'\n";
+
+ }
+ }
+ }
+ if (!errorString.empty()) {
+ _diagnostics.error("%s", errorString.c_str());
+ }
+ }
+
+ if (!_diagnostics.hasError())
+ build(dylibsToCache, otherDylibs, executables, aliases);
+
+ if (!_diagnostics.hasError()) {
+ // If we succeeded in building, then now see if there was a missing required file, and if so why its missing.
+ std::string errorString;
+ for (CacheBuilder::InputFile& inputFile : inputFiles) {
+ if (inputFile.mustBeIncluded() && inputFile.diag.hasError()) {
+ // An error loading a required file must be propagated up to the top level diagnostic handler.
+ std::string message = inputFile.diag.errorMessage();
+ if (message.back() == '\n')
+ message.pop_back();
+ errorString += "Required binary was not included in the shared cache '" + std::string(inputFile.path) + "' because: " + message + "\n";
+ }
+ }
+ if (!errorString.empty()) {
+ _diagnostics.error("%s", errorString.c_str());
+ }
+ }
+
+ // Add all the warnings from the input files to the top level warnings on the main diagnostics object.
+ for (CacheBuilder::InputFile& inputFile : inputFiles) {
+ for (const std::string& warning : inputFile.diag.warnings())
+ _diagnostics.warning("%s", warning.c_str());
+ }
+
+ // Clean up the loaded files
+ for (LoadedMachO& loadedMachO : dylibsToCache)
+ _fileSystem.unloadFile(loadedMachO.loadedFileInfo);
+ for (LoadedMachO& loadedMachO : otherDylibs)
+ _fileSystem.unloadFile(loadedMachO.loadedFileInfo);
+ for (LoadedMachO& loadedMachO : executables)
+ _fileSystem.unloadFile(loadedMachO.loadedFileInfo);
+}
+
+void CacheBuilder::build(const std::vector<DyldSharedCache::MappedMachO>& dylibs,
+ const std::vector<DyldSharedCache::MappedMachO>& otherOsDylibsInput,
+ const std::vector<DyldSharedCache::MappedMachO>& osExecutables,
+ std::vector<DyldSharedCache::FileAlias>& aliases) {
+
+ std::vector<LoadedMachO> dylibsToCache;
+ std::vector<LoadedMachO> otherDylibs;
+ std::vector<LoadedMachO> executables;
+
+ for (const DyldSharedCache::MappedMachO& mappedMachO : dylibs) {
+ dyld3::closure::LoadedFileInfo loadedFileInfo;
+ loadedFileInfo.fileContent = mappedMachO.mh;
+ loadedFileInfo.fileContentLen = mappedMachO.length;
+ loadedFileInfo.sliceOffset = mappedMachO.sliceFileOffset;
+ loadedFileInfo.sliceLen = mappedMachO.length;
+ loadedFileInfo.inode = mappedMachO.inode;
+ loadedFileInfo.mtime = mappedMachO.modTime;
+ loadedFileInfo.path = mappedMachO.runtimePath.c_str();
+ dylibsToCache.emplace_back((LoadedMachO){ mappedMachO, loadedFileInfo, nullptr });
+ }
+
+ for (const DyldSharedCache::MappedMachO& mappedMachO : otherOsDylibsInput) {
+ dyld3::closure::LoadedFileInfo loadedFileInfo;
+ loadedFileInfo.fileContent = mappedMachO.mh;
+ loadedFileInfo.fileContentLen = mappedMachO.length;
+ loadedFileInfo.sliceOffset = mappedMachO.sliceFileOffset;
+ loadedFileInfo.sliceLen = mappedMachO.length;
+ loadedFileInfo.inode = mappedMachO.inode;
+ loadedFileInfo.mtime = mappedMachO.modTime;
+ loadedFileInfo.path = mappedMachO.runtimePath.c_str();
+ otherDylibs.emplace_back((LoadedMachO){ mappedMachO, loadedFileInfo, nullptr });
+ }
+
+ for (const DyldSharedCache::MappedMachO& mappedMachO : osExecutables) {
+ dyld3::closure::LoadedFileInfo loadedFileInfo;
+ loadedFileInfo.fileContent = mappedMachO.mh;
+ loadedFileInfo.fileContentLen = mappedMachO.length;
+ loadedFileInfo.sliceOffset = mappedMachO.sliceFileOffset;
+ loadedFileInfo.sliceLen = mappedMachO.length;
+ loadedFileInfo.inode = mappedMachO.inode;
+ loadedFileInfo.mtime = mappedMachO.modTime;
+ loadedFileInfo.path = mappedMachO.runtimePath.c_str();
+ executables.emplace_back((LoadedMachO){ mappedMachO, loadedFileInfo, nullptr });
+ }
+
+ build(dylibsToCache, otherDylibs, executables, aliases);
+}
+
+void CacheBuilder::build(const std::vector<LoadedMachO>& dylibs,
+ const std::vector<LoadedMachO>& otherOsDylibsInput,
+ const std::vector<LoadedMachO>& osExecutables,
+ std::vector<DyldSharedCache::FileAlias>& aliases)
+{
+ // <rdar://problem/21317611> error out instead of crash if cache has no dylibs
+ // FIXME: plist should specify required vs optional dylibs
+ if ( dylibs.size() < 30 ) {
+ _diagnostics.error("missing required minimum set of dylibs");
+ return;
+ }
+ uint64_t t1 = mach_absolute_time();
+
+ // make copy of dylib list and sort
+ makeSortedDylibs(dylibs, _options.dylibOrdering);
+
+ // allocate space used by largest possible cache plus room for LINKEDITS before optimization
+ _allocatedBufferSize = _archLayout->sharedMemorySize * 1.50;
+ if ( vm_allocate(mach_task_self(), &_fullAllocatedBuffer, _allocatedBufferSize, VM_FLAGS_ANYWHERE) != 0 ) {
+ _diagnostics.error("could not allocate buffer");
+ return;
+ }
+
+ // assign addresses for each segment of each dylib in new cache
+ assignSegmentAddresses();
+ std::vector<const LoadedMachO*> overflowDylibs;
+ while ( cacheOverflowAmount() != 0 ) {
+ if ( !_options.evictLeafDylibsOnOverflow ) {
+ _diagnostics.error("cache overflow by %lluMB", cacheOverflowAmount() / 1024 / 1024);
+ return;
+ }
+ size_t evictionCount = evictLeafDylibs(cacheOverflowAmount(), overflowDylibs);
+ // re-layout cache
+ for (DylibInfo& dylib : _sortedDylibs)
+ dylib.cacheLocation.clear();
+ assignSegmentAddresses();
+
+ _diagnostics.verbose("cache overflow, evicted %lu leaf dylibs\n", evictionCount);
+ }
+ markPaddingInaccessible();
+
+ // copy all segments into cache
+ uint64_t t2 = mach_absolute_time();
+ writeCacheHeader();
+ copyRawSegments();
+
+ // rebase all dylibs for new location in cache
+ uint64_t t3 = mach_absolute_time();
+ _aslrTracker.setDataRegion(_readWriteRegion.buffer, _readWriteRegion.sizeInUse);
+ adjustAllImagesForNewSegmentLocations();
+ if ( _diagnostics.hasError() )
+ return;
+
+ // build ImageArray for dyld3, which has side effect of binding all cached dylibs
+ uint64_t t4 = mach_absolute_time();
+ buildImageArray(aliases);
+ if ( _diagnostics.hasError() )
+ return;
+
+ // optimize ObjC
+ uint64_t t5 = mach_absolute_time();
+ DyldSharedCache* dyldCache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ if ( _options.optimizeObjC )
+ optimizeObjC();
+ if ( _diagnostics.hasError() )
+ return;
+
+
+ // optimize away stubs
+ uint64_t t6 = mach_absolute_time();
+ std::vector<uint64_t> branchPoolOffsets;
+ uint64_t cacheStartAddress = _archLayout->sharedMemoryStart;
+ if ( _options.optimizeStubs ) {
+ std::vector<uint64_t> branchPoolStartAddrs;
+ const uint64_t* p = (uint64_t*)((uint8_t*)dyldCache + dyldCache->header.branchPoolsOffset);
+ for (uint32_t i=0; i < dyldCache->header.branchPoolsCount; ++i) {
+ uint64_t poolAddr = p[i];
+ branchPoolStartAddrs.push_back(poolAddr);
+ branchPoolOffsets.push_back(poolAddr - cacheStartAddress);
+ }
+ optimizeAwayStubs(branchPoolStartAddrs, _branchPoolsLinkEditStartAddr);
+ }
+
+
+ // FIPS seal corecrypto, This must be done after stub elimination (so that __TEXT,__text is not changed after sealing)
+ fipsSign();
+
+ // merge and compact LINKEDIT segments
+ uint64_t t7 = mach_absolute_time();
+ optimizeLinkedit(branchPoolOffsets);
+
+ // copy ImageArray to end of read-only region
+ addImageArray();
+ if ( _diagnostics.hasError() )
+ return;
+
+ // compute and add dlopen closures for all other dylibs
+ addOtherImageArray(otherOsDylibsInput, overflowDylibs);
+ if ( _diagnostics.hasError() )
+ return;
+
+ // compute and add launch closures to end of read-only region
+ uint64_t t8 = mach_absolute_time();
+ addClosures(osExecutables);
+ if ( _diagnostics.hasError() )
+ return;
+
+ // update final readOnly region size
+ dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(_readExecuteRegion.buffer + dyldCache->header.mappingOffset);
+ mappings[2].size = _readOnlyRegion.sizeInUse;
+ if ( _options.excludeLocalSymbols )
+ dyldCache->header.localSymbolsOffset = _readOnlyRegion.cacheFileOffset + _readOnlyRegion.sizeInUse;
+
+ // record max slide now that final size is established
+ if ( _archLayout->sharedRegionsAreDiscontiguous ) {
+ // special case x86_64 which has three non-contiguous chunks each in their own 1GB regions
+ uint64_t maxSlide0 = 0x60000000 - _readExecuteRegion.sizeInUse; // TEXT region has 1.5GB region
+ uint64_t maxSlide1 = 0x40000000 - _readWriteRegion.sizeInUse;
+ uint64_t maxSlide2 = 0x3FE00000 - _readOnlyRegion.sizeInUse;
+ dyldCache->header.maxSlide = std::min(std::min(maxSlide0, maxSlide1), maxSlide2);
+ }
+ else {
+ dyldCache->header.maxSlide = (_archLayout->sharedMemoryStart + _archLayout->sharedMemorySize) - (_readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse);
+ }
+
+ uint64_t t9 = mach_absolute_time();
+
+ // fill in slide info at start of region[2]
+ // do this last because it modifies pointers in DATA segments
+ if ( _options.cacheSupportsASLR ) {
+#if SUPPORT_ARCH_arm64e
+ if ( strcmp(_archLayout->archName, "arm64e") == 0 )
+ writeSlideInfoV3(_aslrTracker.bitmap(), _aslrTracker.dataPageCount());
+ else
+#endif
+ if ( _archLayout->is64 )
+ writeSlideInfoV2<Pointer64<LittleEndian>>(_aslrTracker.bitmap(), _aslrTracker.dataPageCount());
+ else
+#if SUPPORT_ARCH_arm64_32
+ if ( strcmp(_archLayout->archName, "arm64_32") == 0 )
+ writeSlideInfoV4<Pointer32<LittleEndian>>(_aslrTracker.bitmap(), _aslrTracker.dataPageCount());
+ else
+#endif
+ writeSlideInfoV2<Pointer32<LittleEndian>>(_aslrTracker.bitmap(), _aslrTracker.dataPageCount());
+ }
+
+ uint64_t t10 = mach_absolute_time();
+
+ // last sanity check on size
+ if ( cacheOverflowAmount() != 0 ) {
+ _diagnostics.error("cache overflow after optimizations 0x%llX -> 0x%llX", _readExecuteRegion.unslidLoadAddress, _readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse);
+ return;
+ }
+
+ // codesignature is part of file, but is not mapped
+ codeSign();
+ if ( _diagnostics.hasError() )
+ return;
+
+ uint64_t t11 = mach_absolute_time();
+
+ if ( _options.verbose ) {
+ fprintf(stderr, "time to layout cache: %ums\n", absolutetime_to_milliseconds(t2-t1));
+ fprintf(stderr, "time to copy cached dylibs into buffer: %ums\n", absolutetime_to_milliseconds(t3-t2));
+ fprintf(stderr, "time to adjust segments for new split locations: %ums\n", absolutetime_to_milliseconds(t4-t3));
+ fprintf(stderr, "time to bind all images: %ums\n", absolutetime_to_milliseconds(t5-t4));
+ fprintf(stderr, "time to optimize Objective-C: %ums\n", absolutetime_to_milliseconds(t6-t5));
+ fprintf(stderr, "time to do stub elimination: %ums\n", absolutetime_to_milliseconds(t7-t6));
+ fprintf(stderr, "time to optimize LINKEDITs: %ums\n", absolutetime_to_milliseconds(t8-t7));
+ fprintf(stderr, "time to build %lu closures: %ums\n", osExecutables.size(), absolutetime_to_milliseconds(t9-t8));
+ fprintf(stderr, "time to compute slide info: %ums\n", absolutetime_to_milliseconds(t10-t9));
+ fprintf(stderr, "time to compute UUID and codesign cache file: %ums\n", absolutetime_to_milliseconds(t11-t10));
+ }
+
+ return;
+}
+
+
+void CacheBuilder::writeCacheHeader()
+{
+ // "dyld_v1" + spaces + archName(), with enough spaces to pad to 15 bytes
+ std::string magic = "dyld_v1";
+ magic.append(15 - magic.length() - _options.archName.length(), ' ');
+ magic.append(_options.archName);
+ assert(magic.length() == 15);
+
+ // fill in header
+ dyld_cache_header* dyldCacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer;
+ memcpy(dyldCacheHeader->magic, magic.c_str(), 16);
+ dyldCacheHeader->mappingOffset = sizeof(dyld_cache_header);
+ dyldCacheHeader->mappingCount = 3;
+ dyldCacheHeader->imagesOffset = (uint32_t)(dyldCacheHeader->mappingOffset + 3*sizeof(dyld_cache_mapping_info) + sizeof(uint64_t)*_branchPoolStarts.size());
+ dyldCacheHeader->imagesCount = (uint32_t)_sortedDylibs.size() + _aliasCount;
+ dyldCacheHeader->dyldBaseAddress = 0;
+ dyldCacheHeader->codeSignatureOffset = 0;
+ dyldCacheHeader->codeSignatureSize = 0;
+ dyldCacheHeader->slideInfoOffset = _slideInfoFileOffset;
+ dyldCacheHeader->slideInfoSize = _slideInfoBufferSizeAllocated;
+ dyldCacheHeader->localSymbolsOffset = 0;
+ dyldCacheHeader->localSymbolsSize = 0;
+ dyldCacheHeader->cacheType = _options.optimizeStubs ? kDyldSharedCacheTypeProduction : kDyldSharedCacheTypeDevelopment;
+ dyldCacheHeader->accelerateInfoAddr = 0;
+ dyldCacheHeader->accelerateInfoSize = 0;
+ bzero(dyldCacheHeader->uuid, 16);// overwritten later by recomputeCacheUUID()
+ dyldCacheHeader->branchPoolsOffset = dyldCacheHeader->mappingOffset + 3*sizeof(dyld_cache_mapping_info);
+ dyldCacheHeader->branchPoolsCount = (uint32_t)_branchPoolStarts.size();
+ dyldCacheHeader->imagesTextOffset = dyldCacheHeader->imagesOffset + sizeof(dyld_cache_image_info)*dyldCacheHeader->imagesCount;
+ dyldCacheHeader->imagesTextCount = _sortedDylibs.size();
+ dyldCacheHeader->dylibsImageGroupAddr = 0;
+ dyldCacheHeader->dylibsImageGroupSize = 0;
+ dyldCacheHeader->otherImageGroupAddr = 0;
+ dyldCacheHeader->otherImageGroupSize = 0;
+ dyldCacheHeader->progClosuresAddr = 0;
+ dyldCacheHeader->progClosuresSize = 0;
+ dyldCacheHeader->progClosuresTrieAddr = 0;
+ dyldCacheHeader->progClosuresTrieSize = 0;
+ dyldCacheHeader->platform = (uint8_t)_options.platform;
+ dyldCacheHeader->formatVersion = dyld3::closure::kFormatVersion;
+ dyldCacheHeader->dylibsExpectedOnDisk = !_options.dylibsRemovedDuringMastering;
+ dyldCacheHeader->simulator = _options.forSimulator;
+ dyldCacheHeader->locallyBuiltCache = _options.isLocallyBuiltCache;
+ dyldCacheHeader->formatVersion = dyld3::closure::kFormatVersion;
+ dyldCacheHeader->sharedRegionStart = _archLayout->sharedMemoryStart;
+ dyldCacheHeader->sharedRegionSize = _archLayout->sharedMemorySize;
+
+ // fill in mappings
+ dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(_readExecuteRegion.buffer + dyldCacheHeader->mappingOffset);
+ mappings[0].address = _readExecuteRegion.unslidLoadAddress;
+ mappings[0].fileOffset = 0;
+ mappings[0].size = _readExecuteRegion.sizeInUse;
+ mappings[0].maxProt = VM_PROT_READ | VM_PROT_EXECUTE;
+ mappings[0].initProt = VM_PROT_READ | VM_PROT_EXECUTE;
+ mappings[1].address = _readWriteRegion.unslidLoadAddress;
+ mappings[1].fileOffset = _readExecuteRegion.sizeInUse;
+ mappings[1].size = _readWriteRegion.sizeInUse;
+ mappings[1].maxProt = VM_PROT_READ | VM_PROT_WRITE;
+ mappings[1].initProt = VM_PROT_READ | VM_PROT_WRITE;
+ mappings[2].address = _readOnlyRegion.unslidLoadAddress;
+ mappings[2].fileOffset = _readExecuteRegion.sizeInUse + _readWriteRegion.sizeInUse;
+ mappings[2].size = _readOnlyRegion.sizeInUse;
+ mappings[2].maxProt = VM_PROT_READ;
+ mappings[2].initProt = VM_PROT_READ;
+
+ // fill in branch pool addresses
+ uint64_t* p = (uint64_t*)(_readExecuteRegion.buffer + dyldCacheHeader->branchPoolsOffset);
+ for (uint64_t pool : _branchPoolStarts) {
+ *p++ = pool;
+ }
+
+ // fill in image table
+ dyld_cache_image_info* images = (dyld_cache_image_info*)(_readExecuteRegion.buffer + dyldCacheHeader->imagesOffset);
+ for (const DylibInfo& dylib : _sortedDylibs) {
+ const char* installName = dylib.input->mappedFile.mh->installName();
+ images->address = dylib.cacheLocation[0].dstCacheUnslidAddress;
+ if ( _options.dylibsRemovedDuringMastering ) {
+ images->modTime = 0;
+ images->inode = pathHash(installName);
+ }
+ else {
+ images->modTime = dylib.input->mappedFile.modTime;
+ images->inode = dylib.input->mappedFile.inode;
+ }
+ uint32_t installNameOffsetInTEXT = (uint32_t)(installName - (char*)dylib.input->mappedFile.mh);
+ images->pathFileOffset = (uint32_t)dylib.cacheLocation[0].dstCacheFileOffset + installNameOffsetInTEXT;
+ ++images;
+ }
+ // append aliases image records and strings
+/*
+ for (auto &dylib : _dylibs) {
+ if (!dylib->installNameAliases.empty()) {
+ for (const std::string& alias : dylib->installNameAliases) {
+ images->set_address(_segmentMap[dylib][0].address);
+ if (_manifest.platform() == "osx") {
+ images->modTime = dylib->lastModTime;
+ images->inode = dylib->inode;
+ }
+ else {
+ images->modTime = 0;
+ images->inode = pathHash(alias.c_str());
+ }
+ images->pathFileOffset = offset;
+ //fprintf(stderr, "adding alias %s for %s\n", alias.c_str(), dylib->installName.c_str());
+ ::strcpy((char*)&_buffer[offset], alias.c_str());
+ offset += alias.size() + 1;
+ ++images;
+ }
+ }
+ }
+*/
+ // calculate start of text image array and trailing string pool
+ dyld_cache_image_text_info* textImages = (dyld_cache_image_text_info*)(_readExecuteRegion.buffer + dyldCacheHeader->imagesTextOffset);
+ uint32_t stringOffset = (uint32_t)(dyldCacheHeader->imagesTextOffset + sizeof(dyld_cache_image_text_info) * _sortedDylibs.size());
+
+ // write text image array and image names pool at same time
+ for (const DylibInfo& dylib : _sortedDylibs) {
+ dylib.input->mappedFile.mh->getUuid(textImages->uuid);
+ textImages->loadAddress = dylib.cacheLocation[0].dstCacheUnslidAddress;
+ textImages->textSegmentSize = (uint32_t)dylib.cacheLocation[0].dstCacheSegmentSize;
+ textImages->pathOffset = stringOffset;
+ const char* installName = dylib.input->mappedFile.mh->installName();
+ ::strcpy((char*)_readExecuteRegion.buffer + stringOffset, installName);
+ stringOffset += (uint32_t)strlen(installName)+1;
+ ++textImages;
+ }
+
+ // make sure header did not overflow into first mapped image
+ const dyld_cache_image_info* firstImage = (dyld_cache_image_info*)(_readExecuteRegion.buffer + dyldCacheHeader->imagesOffset);
+ assert(stringOffset <= (firstImage->address - mappings[0].address));
+}
+
void CacheBuilder::copyRawSegments()
{
const bool log = false;
- const bool logCFConstants = false;
-
- forEachDylibInfo(^(const DylibInfo& dylib, Diagnostics& dylibDiag) {
+ dispatch_apply(_sortedDylibs.size(), DISPATCH_APPLY_AUTO, ^(size_t index) {
+ const DylibInfo& dylib = _sortedDylibs[index];
for (const SegmentMappingInfo& info : dylib.cacheLocation) {
if (log) fprintf(stderr, "copy %s segment %s (0x%08X bytes) from %p to %p (logical addr 0x%llX) for %s\n",
- _options.archs->name(), info.segName, info.copySegmentSize, info.srcSegment, info.dstSegment, info.dstCacheUnslidAddress, dylib.input->mappedFile.runtimePath.c_str());
+ _options.archName.c_str(), info.segName, info.copySegmentSize, info.srcSegment, info.dstSegment, info.dstCacheUnslidAddress, dylib.input->mappedFile.runtimePath.c_str());
::memcpy(info.dstSegment, info.srcSegment, info.copySegmentSize);
+ if (uint64_t paddingSize = info.dstCacheSegmentSize - info.copySegmentSize) {
+ ::memset((char*)info.dstSegment + info.copySegmentSize, 0, paddingSize);
+ }
}
});
-
- // Copy the coalesced __TEXT sections
- const uint64_t numCoalescedSections = sizeof(CacheCoalescedText::SupportedSections) / sizeof(*CacheCoalescedText::SupportedSections);
- dispatch_apply(numCoalescedSections, DISPATCH_APPLY_AUTO, ^(size_t index) {
- const CacheCoalescedText::StringSection& cacheStringSection = _coalescedText.getSectionData(CacheCoalescedText::SupportedSections[index]);
- if (log) fprintf(stderr, "copy %s __TEXT_COAL section %s (0x%08X bytes) to %p (logical addr 0x%llX)\n",
- _options.archs->name(), CacheCoalescedText::SupportedSections[index],
- cacheStringSection.bufferSize, cacheStringSection.bufferAddr, cacheStringSection.bufferVMAddr);
- for (const auto& stringAndOffset : cacheStringSection.stringsToOffsets)
- ::memcpy(cacheStringSection.bufferAddr + stringAndOffset.second, stringAndOffset.first.data(), stringAndOffset.first.size() + 1);
+}
+
+void CacheBuilder::adjustAllImagesForNewSegmentLocations()
+{
+ __block std::vector<Diagnostics> diags;
+ diags.resize(_sortedDylibs.size());
+
+ if (_options.platform == dyld3::Platform::macOS) {
+ dispatch_apply(_sortedDylibs.size(), DISPATCH_APPLY_AUTO, ^(size_t index) {
+ const DylibInfo& dylib = _sortedDylibs[index];
+ adjustDylibSegments(dylib, diags[index]);
+ });
+ } else {
+ // Note this has to be done in serial because the LOH Tracker isn't thread safe
+ for (size_t index = 0; index != _sortedDylibs.size(); ++index) {
+ const DylibInfo& dylib = _sortedDylibs[index];
+ adjustDylibSegments(dylib, diags[index]);
+ }
+ }
+
+ for (const Diagnostics& diag : diags) {
+ if ( diag.hasError() ) {
+ _diagnostics.error("%s", diag.errorMessage().c_str());
+ break;
+ }
+ }
+}
+
+void CacheBuilder::assignSegmentAddresses()
+{
+ // calculate size of header info and where first dylib's mach_header should start
+ size_t startOffset = sizeof(dyld_cache_header) + 3*sizeof(dyld_cache_mapping_info);
+ size_t maxPoolCount = 0;
+ if ( _archLayout->branchReach != 0 )
+ maxPoolCount = (_archLayout->sharedMemorySize / _archLayout->branchReach);
+ startOffset += maxPoolCount * sizeof(uint64_t);
+ startOffset += sizeof(dyld_cache_image_info) * _sortedDylibs.size();
+ startOffset += sizeof(dyld_cache_image_text_info) * _sortedDylibs.size();
+ for (const DylibInfo& dylib : _sortedDylibs) {
+ startOffset += (strlen(dylib.input->mappedFile.mh->installName()) + 1);
+ }
+ //fprintf(stderr, "%s total header size = 0x%08lX\n", _options.archName.c_str(), startOffset);
+ startOffset = align(startOffset, 12);
+
+ _branchPoolStarts.clear();
+
+ // assign TEXT segment addresses
+ _readExecuteRegion.buffer = (uint8_t*)_fullAllocatedBuffer;
+ _readExecuteRegion.bufferSize = 0;
+ _readExecuteRegion.sizeInUse = 0;
+ _readExecuteRegion.unslidLoadAddress = _archLayout->sharedMemoryStart;
+ _readExecuteRegion.cacheFileOffset = 0;
+ __block uint64_t addr = _readExecuteRegion.unslidLoadAddress + startOffset; // header
+ __block uint64_t lastPoolAddress = addr;
+ for (DylibInfo& dylib : _sortedDylibs) {
+ __block uint64_t textSegVmAddr = 0;
+ dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
+ if ( strcmp(segInfo.segName, "__TEXT") == 0 )
+ textSegVmAddr = segInfo.vmAddr;
+ if ( segInfo.protections != (VM_PROT_READ | VM_PROT_EXECUTE) )
+ return;
+ // Insert branch island pools every 128MB for arm64
+ if ( (_archLayout->branchPoolTextSize != 0) && ((addr + segInfo.vmSize - lastPoolAddress) > _archLayout->branchReach) ) {
+ _branchPoolStarts.push_back(addr);
+ _diagnostics.verbose("adding branch pool at 0x%llX\n", addr);
+ lastPoolAddress = addr;
+ addr += _archLayout->branchPoolTextSize;
+ }
+ // Keep __TEXT segments 4K or more aligned
+ addr = align(addr, std::max((int)segInfo.p2align, (int)12));
+ uint64_t offsetInRegion = addr - _readExecuteRegion.unslidLoadAddress;
+ SegmentMappingInfo loc;
+ loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
+ loc.segName = segInfo.segName;
+ loc.dstSegment = _readExecuteRegion.buffer + offsetInRegion;
+ loc.dstCacheUnslidAddress = addr;
+ loc.dstCacheFileOffset = (uint32_t)offsetInRegion;
+ loc.dstCacheSegmentSize = (uint32_t)align(segInfo.sizeOfSections, 12);
+ loc.copySegmentSize = (uint32_t)align(segInfo.sizeOfSections, 12);
+ loc.srcSegmentIndex = segInfo.segIndex;
+ dylib.cacheLocation.push_back(loc);
+ addr += loc.dstCacheSegmentSize;
+ });
+ }
+ // align TEXT region end
+ uint64_t endTextAddress = align(addr, _archLayout->sharedRegionAlignP2);
+ _readExecuteRegion.bufferSize = endTextAddress - _readExecuteRegion.unslidLoadAddress;
+ _readExecuteRegion.sizeInUse = _readExecuteRegion.bufferSize;
+
+ // assign __DATA* addresses
+ if ( _archLayout->sharedRegionsAreDiscontiguous )
+ addr = _archLayout->sharedMemoryStart + 0x60000000;
+ else
+ addr = align((addr + _archLayout->sharedRegionPadding), _archLayout->sharedRegionAlignP2);
+ _readWriteRegion.buffer = (uint8_t*)_fullAllocatedBuffer + addr - _archLayout->sharedMemoryStart;
+ _readWriteRegion.bufferSize = 0;
+ _readWriteRegion.sizeInUse = 0;
+ _readWriteRegion.unslidLoadAddress = addr;
+ _readWriteRegion.cacheFileOffset = _readExecuteRegion.sizeInUse;
+
+ // layout all __DATA_CONST segments
+ __block int dataConstSegmentCount = 0;
+ for (DylibInfo& dylib : _sortedDylibs) {
+ __block uint64_t textSegVmAddr = 0;
+ dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
+ if ( strcmp(segInfo.segName, "__TEXT") == 0 )
+ textSegVmAddr = segInfo.vmAddr;
+ if ( segInfo.protections != (VM_PROT_READ | VM_PROT_WRITE) )
+ return;
+ if ( strcmp(segInfo.segName, "__DATA_CONST") != 0 )
+ return;
+ ++dataConstSegmentCount;
+ // Pack __DATA_CONST segments
+ addr = align(addr, segInfo.p2align);
+ size_t copySize = std::min((size_t)segInfo.fileSize, (size_t)segInfo.sizeOfSections);
+ uint64_t offsetInRegion = addr - _readWriteRegion.unslidLoadAddress;
+ SegmentMappingInfo loc;
+ loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
+ loc.segName = segInfo.segName;
+ loc.dstSegment = _readWriteRegion.buffer + offsetInRegion;
+ loc.dstCacheUnslidAddress = addr;
+ loc.dstCacheFileOffset = (uint32_t)(_readWriteRegion.cacheFileOffset + offsetInRegion);
+ loc.dstCacheSegmentSize = (uint32_t)segInfo.sizeOfSections;
+ loc.copySegmentSize = (uint32_t)copySize;
+ loc.srcSegmentIndex = segInfo.segIndex;
+ dylib.cacheLocation.push_back(loc);
+ addr += loc.dstCacheSegmentSize;
+ });
+ }
+
+ // layout all __DATA segments (and other r/w non-dirty, non-const) segments
+ for (DylibInfo& dylib : _sortedDylibs) {
+ __block uint64_t textSegVmAddr = 0;
+ dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
+ if ( strcmp(segInfo.segName, "__TEXT") == 0 )
+ textSegVmAddr = segInfo.vmAddr;
+ if ( segInfo.protections != (VM_PROT_READ | VM_PROT_WRITE) )
+ return;
+ if ( strcmp(segInfo.segName, "__DATA_CONST") == 0 )
+ return;
+ if ( strcmp(segInfo.segName, "__DATA_DIRTY") == 0 )
+ return;
+ if ( dataConstSegmentCount > 10 ) {
+ // Pack __DATA segments only if we also have __DATA_CONST segments
+ addr = align(addr, segInfo.p2align);
+ }
+ else {
+ // Keep __DATA segments 4K or more aligned
+ addr = align(addr, std::max((int)segInfo.p2align, (int)12));
+ }
+ size_t copySize = std::min((size_t)segInfo.fileSize, (size_t)segInfo.sizeOfSections);
+ uint64_t offsetInRegion = addr - _readWriteRegion.unslidLoadAddress;
+ SegmentMappingInfo loc;
+ loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
+ loc.segName = segInfo.segName;
+ loc.dstSegment = _readWriteRegion.buffer + offsetInRegion;
+ loc.dstCacheUnslidAddress = addr;
+ loc.dstCacheFileOffset = (uint32_t)(_readWriteRegion.cacheFileOffset + offsetInRegion);
+ loc.dstCacheSegmentSize = (uint32_t)segInfo.sizeOfSections;
+ loc.copySegmentSize = (uint32_t)copySize;
+ loc.srcSegmentIndex = segInfo.segIndex;
+ dylib.cacheLocation.push_back(loc);
+ addr += loc.dstCacheSegmentSize;
+ });
+ }
+
+ // layout all __DATA_DIRTY segments, sorted (FIXME)
+ const size_t dylibCount = _sortedDylibs.size();
+ uint32_t dirtyDataSortIndexes[dylibCount];
+ for (size_t i=0; i < dylibCount; ++i)
+ dirtyDataSortIndexes[i] = (uint32_t)i;
+ std::sort(&dirtyDataSortIndexes[0], &dirtyDataSortIndexes[dylibCount], [&](const uint32_t& a, const uint32_t& b) {
+ const auto& orderA = _options.dirtyDataSegmentOrdering.find(_sortedDylibs[a].input->mappedFile.runtimePath);
+ const auto& orderB = _options.dirtyDataSegmentOrdering.find(_sortedDylibs[b].input->mappedFile.runtimePath);
+ bool foundA = (orderA != _options.dirtyDataSegmentOrdering.end());
+ bool foundB = (orderB != _options.dirtyDataSegmentOrdering.end());
+
+ // Order all __DATA_DIRTY segments specified in the order file first, in the order specified in the file,
+ // followed by any other __DATA_DIRTY segments in lexicographic order.
+ if ( foundA && foundB )
+ return orderA->second < orderB->second;
+ else if ( foundA )
+ return true;
+ else if ( foundB )
+ return false;
+ else
+ return _sortedDylibs[a].input->mappedFile.runtimePath < _sortedDylibs[b].input->mappedFile.runtimePath;
});
-
- // Copy the coalesced CF sections
- if ( _coalescedText.cfStrings.bufferSize != 0 ) {
- uint8_t* dstBuffer = _coalescedText.cfStrings.bufferAddr;
- uint64_t dstBufferVMAddr = _coalescedText.cfStrings.bufferVMAddr;
- forEachDylibInfo(^(const DylibInfo& dylib, Diagnostics& dylibDiag) {
- const char* segmentName = "__OBJC_CONST";
- const char* sectionName = "__cfstring";
- const DylibTextCoalescer::DylibSectionOffsetToCacheSectionOffset& sectionData = dylib.textCoalescer.getSectionCoalescer(segmentName, sectionName);
- if ( sectionData.empty() )
+ addr = align(addr, 12);
+ for (size_t i=0; i < dylibCount; ++i) {
+ DylibInfo& dylib = _sortedDylibs[dirtyDataSortIndexes[i]];
+ __block uint64_t textSegVmAddr = 0;
+ dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
+ if ( strcmp(segInfo.segName, "__TEXT") == 0 )
+ textSegVmAddr = segInfo.vmAddr;
+ if ( segInfo.protections != (VM_PROT_READ | VM_PROT_WRITE) )
return;
-
- uint64_t sectionContentSize = 0;
- const void* sectionContent = dylib.input->mappedFile.mh->findSectionContent(segmentName, sectionName, sectionContentSize);
- assert(sectionContent != nullptr);
- assert(sectionContentSize != 0);
- for (const auto& dylibOffsetAndCacheOffset : sectionData) {
- uint64_t dylibOffset = dylibOffsetAndCacheOffset.first;
- uint64_t cacheOffset = dylibOffsetAndCacheOffset.second;
- if (logCFConstants) fprintf(stderr, "copy %s %s section %s (0x%08X bytes) to %p (logical addr 0x%llX)\n",
- _options.archs->name(), segmentName, sectionName,
- (uint32_t)DyldSharedCache::ConstantClasses::cfStringAtomSize, dstBuffer + cacheOffset, dstBufferVMAddr + cacheOffset);
- ::memcpy(dstBuffer + cacheOffset, (const uint8_t*)sectionContent + dylibOffset, (size_t)DyldSharedCache::ConstantClasses::cfStringAtomSize);
- }
+ if ( strcmp(segInfo.segName, "__DATA_DIRTY") != 0 )
+ return;
+ // Pack __DATA_DIRTY segments
+ addr = align(addr, segInfo.p2align);
+ size_t copySize = std::min((size_t)segInfo.fileSize, (size_t)segInfo.sizeOfSections);
+ uint64_t offsetInRegion = addr - _readWriteRegion.unslidLoadAddress;
+ SegmentMappingInfo loc;
+ loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
+ loc.segName = segInfo.segName;
+ loc.dstSegment = _readWriteRegion.buffer + offsetInRegion;
+ loc.dstCacheUnslidAddress = addr;
+ loc.dstCacheFileOffset = (uint32_t)(_readWriteRegion.cacheFileOffset + offsetInRegion);
+ loc.dstCacheSegmentSize = (uint32_t)segInfo.sizeOfSections;
+ loc.copySegmentSize = (uint32_t)copySize;
+ loc.srcSegmentIndex = segInfo.segIndex;
+ dylib.cacheLocation.push_back(loc);
+ addr += loc.dstCacheSegmentSize;
});
}
-}
-
-void CacheBuilder::adjustAllImagesForNewSegmentLocations(uint64_t cacheBaseAddress,
- ASLR_Tracker& aslrTracker, LOH_Tracker* lohTracker,
- const CacheBuilder::CacheCoalescedText* coalescedText)
-{
- // Note this cannot to be done in parallel because the LOH Tracker and aslr tracker are not thread safe
- __block bool badDylib = false;
- forEachDylibInfo(^(const DylibInfo& dylib, Diagnostics& dylibDiag) {
- if ( dylibDiag.hasError() )
- return;
- adjustDylibSegments(dylib, dylibDiag, cacheBaseAddress, aslrTracker,
- lohTracker, coalescedText);
- if ( dylibDiag.hasError() )
- badDylib = true;
- });
-
- if ( badDylib && !_diagnostics.hasError() ) {
- _diagnostics.error("One or more binaries has an error which prevented linking. See other errors.");
- }
-}
-
-
-CacheBuilder::ASLR_Tracker::~ASLR_Tracker()
-{
- if ( _bitmap != nullptr )
- ::free(_bitmap);
-#if BUILDING_APP_CACHE_UTIL
- if ( _cacheLevels != nullptr )
- ::free(_cacheLevels);
-#endif
-}
-
-void CacheBuilder::ASLR_Tracker::setDataRegion(const void* rwRegionStart, size_t rwRegionSize)
-{
- _pageCount = (unsigned)(rwRegionSize+_pageSize-1)/_pageSize;
- _regionStart = (uint8_t*)rwRegionStart;
- _regionEnd = (uint8_t*)rwRegionStart + rwRegionSize;
- _bitmap = (bool*)calloc(_pageCount*(_pageSize/kMinimumFixupAlignment)*sizeof(bool), 1);
-#if BUILDING_APP_CACHE_UTIL
- size_t cacheLevelsSize = (_pageCount*(_pageSize/kMinimumFixupAlignment)*sizeof(uint8_t));
- _cacheLevels = (uint8_t*)malloc(cacheLevelsSize);
- memset(_cacheLevels, (int)~0U, cacheLevelsSize);
-#endif
-}
-
-void CacheBuilder::ASLR_Tracker::add(void* loc, uint8_t level)
-{
- if (!_enabled)
- return;
- uint8_t* p = (uint8_t*)loc;
- assert(p >= _regionStart);
- assert(p < _regionEnd);
- _bitmap[(p-_regionStart)/kMinimumFixupAlignment] = true;
-
-#if BUILDING_APP_CACHE_UTIL
- if ( level != (uint8_t)~0U ) {
- _cacheLevels[(p-_regionStart)/kMinimumFixupAlignment] = level;
- }
-#endif
-}
-
-void CacheBuilder::ASLR_Tracker::remove(void* loc)
-{
- if (!_enabled)
- return;
- uint8_t* p = (uint8_t*)loc;
- assert(p >= _regionStart);
- assert(p < _regionEnd);
- _bitmap[(p-_regionStart)/kMinimumFixupAlignment] = false;
-}
-
-bool CacheBuilder::ASLR_Tracker::has(void* loc, uint8_t* level) const
-{
- if (!_enabled)
- return true;
- uint8_t* p = (uint8_t*)loc;
- assert(p >= _regionStart);
- assert(p < _regionEnd);
-
- if ( _bitmap[(p-_regionStart)/kMinimumFixupAlignment] ) {
-#if BUILDING_APP_CACHE_UTIL
- if ( level != nullptr ) {
- uint8_t levelValue = _cacheLevels[(p-_regionStart)/kMinimumFixupAlignment];
- if ( levelValue != (uint8_t)~0U )
- *level = levelValue;
- }
-#endif
- return true;
- }
- return false;
-}
-
-void CacheBuilder::ASLR_Tracker::setHigh8(void* p, uint8_t high8)
-{
- _high8Map[p] = high8;
-}
-
-void CacheBuilder::ASLR_Tracker::setAuthData(void* p, uint16_t diversity, bool hasAddrDiv, uint8_t key)
-{
- _authDataMap[p] = {diversity, hasAddrDiv, key};
-}
-
-void CacheBuilder::ASLR_Tracker::setRebaseTarget32(void*p, uint32_t targetVMAddr)
-{
- _rebaseTarget32[p] = targetVMAddr;
-}
-
-void CacheBuilder::ASLR_Tracker::setRebaseTarget64(void*p, uint64_t targetVMAddr)
-{
- _rebaseTarget64[p] = targetVMAddr;
-}
-
-bool CacheBuilder::ASLR_Tracker::hasHigh8(void* p, uint8_t* highByte) const
-{
- auto pos = _high8Map.find(p);
- if ( pos == _high8Map.end() )
- return false;
- *highByte = pos->second;
- return true;
-}
-
-bool CacheBuilder::ASLR_Tracker::hasAuthData(void* p, uint16_t* diversity, bool* hasAddrDiv, uint8_t* key) const
-{
- auto pos = _authDataMap.find(p);
- if ( pos == _authDataMap.end() )
- return false;
- *diversity = pos->second.diversity;
- *hasAddrDiv = pos->second.addrDiv;
- *key = pos->second.key;
- return true;
-}
-
-bool CacheBuilder::ASLR_Tracker::hasRebaseTarget32(void* p, uint32_t* vmAddr) const
-{
- auto pos = _rebaseTarget32.find(p);
- if ( pos == _rebaseTarget32.end() )
- return false;
- *vmAddr = pos->second;
- return true;
-}
-
-bool CacheBuilder::ASLR_Tracker::hasRebaseTarget64(void* p, uint64_t* vmAddr) const
-{
- auto pos = _rebaseTarget64.find(p);
- if ( pos == _rebaseTarget64.end() )
- return false;
- *vmAddr = pos->second;
- return true;
-}
-
-std::vector<void*> CacheBuilder::ASLR_Tracker::getRebaseTargets() const {
- std::vector<void*> targets;
- for (const auto& target : _rebaseTarget32)
- targets.push_back(target.first);
- for (const auto& target : _rebaseTarget64)
- targets.push_back(target.first);
- return targets;
-}
-
-//////////////////////////// DylibTextCoalescer ////////////////////////////////////
-
-bool CacheBuilder::DylibTextCoalescer::segmentWasCoalesced(std::string_view segmentName) const {
- if (segmentName.size() > 16)
- segmentName = segmentName.substr(0, 16);
-
- if ( segmentName == "__OBJC_CONST" ) {
- return !cfStrings.empty();
- }
-
- return false;
-}
-
-bool CacheBuilder::DylibTextCoalescer::sectionWasCoalesced(std::string_view segmentName,
- std::string_view sectionName) const {
- if (segmentName.size() > 16)
- segmentName = segmentName.substr(0, 16);
- if (sectionName.size() > 16)
- sectionName = sectionName.substr(0, 16);
-
- if ( segmentName == "__TEXT" ) {
- std::map<std::string_view, const DylibSectionOffsetToCacheSectionOffset*> supportedSections = {
- { "__objc_classname", &objcClassNames },
- { "__objc_methname", &objcMethNames },
- { "__objc_methtype", &objcMethTypes }
- };
- auto it = supportedSections.find(sectionName);
- if (it == supportedSections.end())
- return false;
- return !it->second->empty();
- }
-
- if ( segmentName == "__OBJC_CONST" ) {
- if ( sectionName == "__cfstring" ) {
- return !cfStrings.empty();
- }
- }
-
- return false;
-}
-
-CacheBuilder::DylibTextCoalescer::DylibSectionOffsetToCacheSectionOffset&
-CacheBuilder::DylibTextCoalescer::getSectionCoalescer(std::string_view segmentName, std::string_view sectionName) {
- if (segmentName.size() > 16)
- segmentName = segmentName.substr(0, 16);
- if (sectionName.size() > 16)
- sectionName = sectionName.substr(0, 16);
-
- if ( segmentName == "__TEXT" ) {
- std::map<std::string_view, DylibSectionOffsetToCacheSectionOffset*> supportedSections = {
- { "__objc_classname", &objcClassNames },
- { "__objc_methname", &objcMethNames },
- { "__objc_methtype", &objcMethTypes }
- };
- auto it = supportedSections.find(sectionName);
- assert(it != supportedSections.end());
- return *it->second;
- }
-
- if ( segmentName == "__OBJC_CONST" ) {
- if ( sectionName == "__cfstring" ) {
- return cfStrings;
- }
- }
-
- assert(false);
-}
-
-const CacheBuilder::DylibTextCoalescer::DylibSectionOffsetToCacheSectionOffset&
-CacheBuilder::DylibTextCoalescer::getSectionCoalescer(std::string_view segmentName, std::string_view sectionName) const {
- if (segmentName.size() > 16)
- segmentName = segmentName.substr(0, 16);
- if (sectionName.size() > 16)
- sectionName = sectionName.substr(0, 16);
-
- if ( segmentName == "__TEXT" ) {
- std::map<std::string_view, const DylibSectionOffsetToCacheSectionOffset*> supportedSections = {
- { "__objc_classname", &objcClassNames },
- { "__objc_methname", &objcMethNames },
- { "__objc_methtype", &objcMethTypes }
- };
- auto it = supportedSections.find(sectionName);
- assert(it != supportedSections.end());
- return *it->second;
- }
-
- if ( segmentName == "__OBJC_CONST" ) {
- if ( sectionName == "__cfstring" ) {
- return cfStrings;
- }
- }
-
- assert(false);
-}
-
-//////////////////////////// CacheCoalescedText ////////////////////////////////////
-const char* CacheBuilder::CacheCoalescedText::SupportedSections[] = {
- "__objc_classname",
- "__objc_methname",
- "__objc_methtype",
-};
-
-void CacheBuilder::CacheCoalescedText::
- parseCoalescableText(const dyld3::MachOAnalyzer* ma,
- DylibTextCoalescer& textCoalescer,
- const IMPCaches::SelectorMap& selectors,
- IMPCaches::HoleMap& selectorsHoleMap) {
- static const bool log = false;
-
- // We can only remove sections if we know we have split seg v2 to point to it
- // Otherwise, a PC relative load in the __TEXT segment wouldn't know how to point to the new strings
- // which are no longer in the same segment
- uint32_t splitSegSize = 0;
- const void* splitSegStart = ma->getSplitSeg(splitSegSize);
- if (!splitSegStart)
- return;
-
- if ((*(const uint8_t*)splitSegStart) != DYLD_CACHE_ADJ_V2_FORMAT)
- return;
-
- // We can only remove sections from the end of a segment, so cache them all and walk backwards.
- __block std::vector<std::pair<std::string, dyld3::MachOAnalyzer::SectionInfo>> textSectionInfos;
- ma->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo §Info, bool malformedSectionRange, bool &stop) {
- if (strcmp(sectInfo.segInfo.segName, "__TEXT") != 0)
- return;
- assert(!malformedSectionRange);
- textSectionInfos.push_back({ sectInfo.sectName, sectInfo });
- });
-
- const std::set<std::string_view> supportedSections(std::begin(SupportedSections), std::end(SupportedSections));
- int64_t slide = ma->getSlide();
-
- bool isSelectorsSection = false;
- for (auto sectionInfoIt = textSectionInfos.rbegin(); sectionInfoIt != textSectionInfos.rend(); ++sectionInfoIt) {
- const std::string& sectionName = sectionInfoIt->first;
- const dyld3::MachOAnalyzer::SectionInfo& sectInfo = sectionInfoIt->second;
-
- isSelectorsSection = (sectionName == "__objc_methname");
-
- // If we find a section we can't handle then stop here. Hopefully we coalesced some from the end.
- if (supportedSections.find(sectionName) == supportedSections.end())
- break;
-
- StringSection& cacheStringSection = getSectionData(sectionName);
-
- DylibTextCoalescer::DylibSectionOffsetToCacheSectionOffset& sectionStringData = textCoalescer.getSectionCoalescer("__TEXT", sectionName);
-
- // Walk the strings in this section
- const uint8_t* content = (uint8_t*)(sectInfo.sectAddr + slide);
- const char* s = (char*)content;
- const char* end = s + sectInfo.sectSize;
- while ( s < end ) {
- std::string_view str = s;
- int cacheSectionOffset = 0;
-
- auto it = cacheStringSection.stringsToOffsets.find(str);
- if (it != cacheStringSection.stringsToOffsets.end()) {
- // Debugging only. If we didn't include the string then we saved that many bytes
- cacheStringSection.savedSpace += str.size() + 1;
- cacheSectionOffset = it->second;
- } else if (isSelectorsSection) {
- // If we are in the selectors section, we need to move
- // the selectors in the selector map to their correct addresses,
- // and fill the holes with the rest
-
-#if BUILDING_APP_CACHE_UTIL
- cacheSectionOffset = cacheStringSection.bufferSize;
-#else
- const IMPCaches::SelectorMap::UnderlyingMap & map = selectors.map;
- IMPCaches::SelectorMap::UnderlyingMap::const_iterator selectorsIterator = map.find(str);
- if (selectorsIterator != map.end()) {
- cacheSectionOffset = selectorsIterator->second->offset;
- } else {
- cacheSectionOffset = selectorsHoleMap.addStringOfSize((unsigned)str.size() + 1);
- }
-#endif
- cacheStringSection.stringsToOffsets[str] = cacheSectionOffset;
- uint32_t sizeAtLeast = cacheSectionOffset + (uint32_t)str.size() + 1;
- if (cacheStringSection.bufferSize < sizeAtLeast) {
- cacheStringSection.bufferSize = sizeAtLeast;
- }
- } else {
- auto itAndInserted = cacheStringSection.stringsToOffsets.insert({ str, cacheStringSection.bufferSize });
- cacheSectionOffset = itAndInserted.first->second;
- assert(itAndInserted.second);
-
- cacheStringSection.bufferSize += str.size() + 1;
- if (log) {
- printf("Selector: %s -> %s\n", ma->installName(), s);
- }
- }
-
- // Now keep track of this offset in our source dylib as pointing to this offset
- uint32_t sourceSectionOffset = (uint32_t)((uint64_t)s - (uint64_t)content);
- sectionStringData[sourceSectionOffset] = cacheSectionOffset;
- s += str.size() + 1;
- }
- }
-}
-
-void CacheBuilder::CacheCoalescedText::parseCFConstants(const dyld3::MachOAnalyzer *ma,
- DylibTextCoalescer &textCoalescer) {
- static const bool log = false;
-
- // FIXME: Re-enable this once we can correctly patch the shared cache
- if ( ma != nullptr )
- return;
-
- if ( !ma->is64() )
- return;
-
- // We only support chained fixups as we need to rewrite binds/rebases after applying split seg
- // and that is much easier with chained fixups than opcodes
- if ( !ma->hasChainedFixupsLoadCommand() )
- return;
-
- // FIXME: Support DYLD_CHAINED_PTR_ARM64E_USERLAND once ld64 moves to it.
- const uint16_t pointerFormat = ma->chainedPointerFormat();
- if ( pointerFormat != DYLD_CHAINED_PTR_ARM64E )
- return;
-
- // We can only remove sections if we know we have split seg v2 to point to it
- // Otherwise, a PC relative load in the __TEXT segment wouldn't know how to point to the new constants
- // which are no longer in the same segment
- if ( !ma->isSplitSegV2() )
- return;
-
- // We can only remove sections from the end of a segment, so cache them all and walk backwards.
- __block std::vector<std::pair<std::string, dyld3::MachOAnalyzer::SectionInfo>> dataSectionInfos;
- __block uint64_t cstringStartVMAddr = 0;
- __block uint64_t cstringEndVMAddr = 0;
- ma->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo §Info, bool malformedSectionRange, bool &stop) {
- if ( malformedSectionRange )
- return;
- if ( strcmp(sectInfo.segInfo.segName, "__OBJC_CONST") == 0 ) {
- dataSectionInfos.push_back({ sectInfo.sectName, sectInfo });
- return;
- }
- if ( strcmp(sectInfo.segInfo.segName, "__TEXT") == 0 ) {
- if ( strcmp(sectInfo.sectName, "__cstring") == 0 ) {
- if ( ( (sectInfo.sectFlags & SECTION_TYPE) == S_CSTRING_LITERALS ) ) {
- cstringStartVMAddr = sectInfo.sectAddr;
- cstringEndVMAddr = cstringStartVMAddr + sectInfo.sectSize;
- }
- }
- }
- });
-
- // We need to clear the chained pointer fixups for the whole segment, so can only
- // process any type of CF object if we can process them all
- if ( dataSectionInfos.size() != 1 )
- return;
-
- if ( dataSectionInfos.front().first != "__cfstring" )
- return;
-
- if ( cstringStartVMAddr == 0 )
- return;
-
- const dyld3::MachOAnalyzer::SectionInfo& cfStringsSection = dataSectionInfos.back().second;
-
- // A CFString is layed out in memory as
- // {
- // uintptr_t isa;
- // uint32_t encoding;
- // uint32_t padding;
- // uintptr_t cstringData;
- // uintptr_t cstringLength;
- // }
- const uint64_t cstringDataOffset = 16;
- const char* className = cfStrings.isaClassName;
- if ( cfStringsSection.sectSize % (uint32_t)DyldSharedCache::ConstantClasses::cfStringAtomSize ) {
- // We don't support padding or any kind on the section
- return;
- }
-
- uint64_t baseAddress = ma->preferredLoadAddress();
-
- uint64_t startVMOffset = cfStringsSection.sectAddr - baseAddress;
- uint64_t endVMOffset = startVMOffset + cfStringsSection.sectSize;
-
- __block Diagnostics diag;
-
- // Make sure no symbols are pointing in to this section
- __block bool hasSymbols = false;
- ma->forEachGlobalSymbol(diag, ^(const char *symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool &stop) {
- uint64_t vmOffset = n_value - baseAddress;
- if ( vmOffset < startVMOffset )
- return;
- if ( vmOffset >= endVMOffset )
- return;
- // In range of our section
- hasSymbols = true;
- stop = true;
- });
- if ( diag.hasError() )
- return;
- if ( hasSymbols )
- return;
-
- ma->forEachLocalSymbol(diag, ^(const char *symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool &stop) {
- uint64_t vmOffset = n_value - baseAddress;
- if ( vmOffset < startVMOffset )
- return;
- if ( vmOffset >= endVMOffset )
- return;
- // In range of our section
- hasSymbols = true;
- stop = true;
- });
- if ( diag.hasError() )
- return;
- if ( hasSymbols )
- return;
-
- ma->forEachExportedSymbol(diag, ^(const char *symbolName, uint64_t imageOffset, uint64_t flags, uint64_t other, const char *importName, bool &stop) {
- if ( imageOffset < startVMOffset )
- return;
- if ( imageOffset >= endVMOffset )
- return;
- // In range of our section
- hasSymbols = true;
- stop = true;
- });
- if ( diag.hasError() )
- return;
- if ( hasSymbols )
- return;
-
- __block std::vector<const char*> dependentPaths;
- ma->forEachDependentDylib(^(const char *loadPath, bool isWeak, bool isReExport,
- bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool &stop) {
- dependentPaths.push_back(loadPath);
- });
-
- // Find all the binds to the ISA class. These delineate the atoms
- // In CoreFoundation itself, we are looking for rebases to the ISA
- __block std::vector<uint64_t> atomOffsets;
-
- bool dylibExportsISA = strcmp(ma->installName(), cfStrings.isaInstallName) == 0;
- if ( !dylibExportsISA ) {
- // This dylib doens't export the class, so look for binds to the ISA
- __block std::vector<std::pair<const char*, int>> bindTargetSymbols;
- ma->forEachChainedFixupTarget(diag, ^(int libraryOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) {
- bindTargetSymbols.push_back({ symbolName, libraryOrdinal });
+
+ // align DATA region end
+ uint64_t endDataAddress = align(addr, _archLayout->sharedRegionAlignP2);
+ _readWriteRegion.bufferSize = endDataAddress - _readWriteRegion.unslidLoadAddress;
+ _readWriteRegion.sizeInUse = _readWriteRegion.bufferSize;
+
+ // start read-only region
+ if ( _archLayout->sharedRegionsAreDiscontiguous )
+ addr = _archLayout->sharedMemoryStart + 0xA0000000;
+ else
+ addr = align((addr + _archLayout->sharedRegionPadding), _archLayout->sharedRegionAlignP2);
+ _readOnlyRegion.buffer = (uint8_t*)_fullAllocatedBuffer + addr - _archLayout->sharedMemoryStart;
+ _readOnlyRegion.bufferSize = 0;
+ _readOnlyRegion.sizeInUse = 0;
+ _readOnlyRegion.unslidLoadAddress = addr;
+ _readOnlyRegion.cacheFileOffset = _readWriteRegion.cacheFileOffset + _readWriteRegion.sizeInUse;
+
+ // reserve space for kernel ASLR slide info at start of r/o region
+ if ( _options.cacheSupportsASLR ) {
+ size_t slideInfoSize = sizeof(dyld_cache_slide_info);
+ slideInfoSize = std::max(slideInfoSize, sizeof(dyld_cache_slide_info2));
+ slideInfoSize = std::max(slideInfoSize, sizeof(dyld_cache_slide_info3));
+ slideInfoSize = std::max(slideInfoSize, sizeof(dyld_cache_slide_info4));
+ _slideInfoBufferSizeAllocated = align(slideInfoSize + (_readWriteRegion.sizeInUse/4096) * _archLayout->slideInfoBytesPerPage, _archLayout->sharedRegionAlignP2);
+ _slideInfoFileOffset = _readOnlyRegion.cacheFileOffset;
+ addr += _slideInfoBufferSizeAllocated;
+ }
+
+ // layout all read-only (but not LINKEDIT) segments
+ for (DylibInfo& dylib : _sortedDylibs) {
+ __block uint64_t textSegVmAddr = 0;
+ dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
+ if ( strcmp(segInfo.segName, "__TEXT") == 0 )
+ textSegVmAddr = segInfo.vmAddr;
+ if ( segInfo.protections != VM_PROT_READ )
+ return;
+ if ( strcmp(segInfo.segName, "__LINKEDIT") == 0 )
+ return;
+ // Keep segments segments 4K or more aligned
+ addr = align(addr, std::max((int)segInfo.p2align, (int)12));
+ uint64_t offsetInRegion = addr - _readOnlyRegion.unslidLoadAddress;
+ SegmentMappingInfo loc;
+ loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
+ loc.segName = segInfo.segName;
+ loc.dstSegment = _readOnlyRegion.buffer + offsetInRegion;
+ loc.dstCacheUnslidAddress = addr;
+ loc.dstCacheFileOffset = (uint32_t)(_readOnlyRegion.cacheFileOffset + offsetInRegion);
+ loc.dstCacheSegmentSize = (uint32_t)align(segInfo.sizeOfSections, 12);
+ loc.copySegmentSize = (uint32_t)segInfo.sizeOfSections;
+ loc.srcSegmentIndex = segInfo.segIndex;
+ dylib.cacheLocation.push_back(loc);
+ addr += loc.dstCacheSegmentSize;
});
-
- __block bool foundBadBind = false;
- ma->withChainStarts(diag, ma->chainStartsOffset(), ^(const dyld_chained_starts_in_image* startsInfo) {
- if ( foundBadBind )
+ }
+ // layout all LINKEDIT segments (after other read-only segments), aligned to 16KB
+ addr = align(addr, 14);
+ _nonLinkEditReadOnlySize = addr - _readOnlyRegion.unslidLoadAddress;
+ for (DylibInfo& dylib : _sortedDylibs) {
+ __block uint64_t textSegVmAddr = 0;
+ dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
+ if ( strcmp(segInfo.segName, "__TEXT") == 0 )
+ textSegVmAddr = segInfo.vmAddr;
+ if ( segInfo.protections != VM_PROT_READ )
return;
- ma->forEachFixupInAllChains(diag, startsInfo, false, ^(dyld3::MachOLoaded::ChainedFixupPointerOnDisk* fixupLoc,
- const dyld_chained_starts_in_segment* segInfo, bool& stopFixups) {
- // Skip anything not in this section
- uint64_t vmOffset = (uint8_t*)fixupLoc - (uint8_t*)ma;
- if ( vmOffset < startVMOffset )
- return;
- if ( vmOffset >= endVMOffset )
- return;
-
- uint32_t bindOrdinal;
- int64_t ptrAddend;
- if ( fixupLoc->isBind(pointerFormat, bindOrdinal, ptrAddend) ) {
- if ( ptrAddend != 0 ) {
- foundBadBind = true;
- stopFixups = true;
- return;
- }
- if ( bindOrdinal >= bindTargetSymbols.size() ) {
- foundBadBind = true;
- stopFixups = true;
- return;
- }
- if ( strcmp(bindTargetSymbols[bindOrdinal].first, className) != 0 ) {
- foundBadBind = true;
- stopFixups = true;
- return;
- }
- int libOrdinal = bindTargetSymbols[bindOrdinal].second;
- if ( libOrdinal <= 0 ) {
- foundBadBind = true;
- stopFixups = true;
- return;
- }
- int depIndex = libOrdinal - 1;
- if ( depIndex >= dependentPaths.size() ) {
- foundBadBind = true;
- stopFixups = true;
- return;
- }
- const char* depLoadPath = dependentPaths[depIndex];
- // All dylibs must find the ISA in the same place
- if ( strcmp(cfStrings.isaInstallName, depLoadPath) != 0 ) {
- foundBadBind = true;
- stopFixups = true;
- return;
- }
- atomOffsets.push_back(vmOffset);
- }
- });
+ if ( strcmp(segInfo.segName, "__LINKEDIT") != 0 )
+ return;
+ // Keep segments segments 4K or more aligned
+ addr = align(addr, std::max((int)segInfo.p2align, (int)12));
+ size_t copySize = std::min((size_t)segInfo.fileSize, (size_t)segInfo.sizeOfSections);
+ uint64_t offsetInRegion = addr - _readOnlyRegion.unslidLoadAddress;
+ SegmentMappingInfo loc;
+ loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
+ loc.segName = segInfo.segName;
+ loc.dstSegment = _readOnlyRegion.buffer + offsetInRegion;
+ loc.dstCacheUnslidAddress = addr;
+ loc.dstCacheFileOffset = (uint32_t)(_readOnlyRegion.cacheFileOffset + offsetInRegion);
+ loc.dstCacheSegmentSize = (uint32_t)align(segInfo.sizeOfSections, 12);
+ loc.copySegmentSize = (uint32_t)copySize;
+ loc.srcSegmentIndex = segInfo.segIndex;
+ dylib.cacheLocation.push_back(loc);
+ addr += loc.dstCacheSegmentSize;
});
- if ( foundBadBind )
- return;
-
- if ( atomOffsets.empty() )
- return;
- }
-
- if ( diag.hasError() )
- return;
-
- // Find all the rebases in the atoms, which correpond to pointers strings
- __block std::map<uint64_t, uint64_t> sectionRebases;
- ma->withChainStarts(diag, ma->chainStartsOffset(), ^(const dyld_chained_starts_in_image* startsInfo) {
- ma->forEachFixupInAllChains(diag, startsInfo, false, ^(dyld3::MachOLoaded::ChainedFixupPointerOnDisk* fixupLoc, const dyld_chained_starts_in_segment* segInfo, bool& stopFixups) {
- // Skip anything not in this section
- uint64_t vmOffset = (uint8_t*)fixupLoc - (uint8_t*)ma;
- if ( vmOffset < startVMOffset )
- return;
- if ( vmOffset >= endVMOffset )
- return;
-
- uint64_t rebaseTargetRuntimeOffset;
- if ( fixupLoc->isRebase(pointerFormat, 0, rebaseTargetRuntimeOffset) ) {
- if ( dylibExportsISA && (rebaseTargetRuntimeOffset == cfStrings.isaVMOffset) ) {
- atomOffsets.push_back(vmOffset);
- } else {
- sectionRebases[vmOffset] = rebaseTargetRuntimeOffset;
- }
+ }
+ // add room for branch pool linkedits
+ _branchPoolsLinkEditStartAddr = addr;
+ addr += (_branchPoolStarts.size() * _archLayout->branchPoolLinkEditSize);
+
+ // align r/o region end
+ uint64_t endReadOnlyAddress = align(addr, _archLayout->sharedRegionAlignP2);
+ _readOnlyRegion.bufferSize = endReadOnlyAddress - _readOnlyRegion.unslidLoadAddress;
+ _readOnlyRegion.sizeInUse = _readOnlyRegion.bufferSize;
+
+ //fprintf(stderr, "RX region=%p -> %p, logical addr=0x%llX\n", _readExecuteRegion.buffer, _readExecuteRegion.buffer+_readExecuteRegion.bufferSize, _readExecuteRegion.unslidLoadAddress);
+ //fprintf(stderr, "RW region=%p -> %p, logical addr=0x%llX\n", _readWriteRegion.buffer, _readWriteRegion.buffer+_readWriteRegion.bufferSize, _readWriteRegion.unslidLoadAddress);
+ //fprintf(stderr, "RO region=%p -> %p, logical addr=0x%llX\n", _readOnlyRegion.buffer, _readOnlyRegion.buffer+_readOnlyRegion.bufferSize, _readOnlyRegion.unslidLoadAddress);
+
+ // sort SegmentMappingInfo for each image to be in the same order as original segments
+ for (DylibInfo& dylib : _sortedDylibs) {
+ std::sort(dylib.cacheLocation.begin(), dylib.cacheLocation.end(), [&](const SegmentMappingInfo& a, const SegmentMappingInfo& b) {
+ return a.srcSegmentIndex < b.srcSegmentIndex;
+ });
+ }
+}
+
+void CacheBuilder::markPaddingInaccessible()
+{
+ // region between RX and RW
+ uint8_t* startPad1 = _readExecuteRegion.buffer+_readExecuteRegion.sizeInUse;
+ uint8_t* endPad1 = _readWriteRegion.buffer;
+ ::vm_protect(mach_task_self(), (vm_address_t)startPad1, endPad1-startPad1, false, 0);
+
+ // region between RW and RO
+ uint8_t* startPad2 = _readWriteRegion.buffer+_readWriteRegion.sizeInUse;
+ uint8_t* endPad2 = _readOnlyRegion.buffer;
+ ::vm_protect(mach_task_self(), (vm_address_t)startPad2, endPad2-startPad2, false, 0);
+}
+
+
+uint64_t CacheBuilder::pathHash(const char* path)
+{
+ uint64_t sum = 0;
+ for (const char* s=path; *s != '\0'; ++s)
+ sum += sum*4 + *s;
+ return sum;
+}
+
+
+void CacheBuilder::findDylibAndSegment(const void* contentPtr, std::string& foundDylibName, std::string& foundSegName)
+{
+ foundDylibName = "???";
+ foundSegName = "???";
+ uint64_t unslidVmAddr = ((uint8_t*)contentPtr - _readExecuteRegion.buffer) + _readExecuteRegion.unslidLoadAddress;
+ const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ cache->forEachImage(^(const mach_header* mh, const char* installName) {
+ ((dyld3::MachOLoaded*)mh)->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& info, bool &stop) {
+ if ( (unslidVmAddr >= info.vmAddr) && (unslidVmAddr < (info.vmAddr+info.vmSize)) ) {
+ foundDylibName = installName;
+ foundSegName = info.segName;
+ stop = true;
}
});
});
- if ( diag.hasError() )
+}
+
+
+template <typename P>
+bool CacheBuilder::makeRebaseChainV2(uint8_t* pageContent, uint16_t lastLocationOffset, uint16_t offset, const dyld_cache_slide_info2* info)
+{
+ typedef typename P::uint_t pint_t;
+
+ const pint_t deltaMask = (pint_t)(info->delta_mask);
+ const pint_t valueMask = ~deltaMask;
+ const pint_t valueAdd = (pint_t)(info->value_add);
+ const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2;
+ const uint32_t maxDelta = (uint32_t)(deltaMask >> deltaShift);
+
+ pint_t* lastLoc = (pint_t*)&pageContent[lastLocationOffset+0];
+ pint_t lastValue = (pint_t)P::getP(*lastLoc);
+ if ( (lastValue - valueAdd) & deltaMask ) {
+ std::string dylibName;
+ std::string segName;
+ findDylibAndSegment((void*)pageContent, dylibName, segName);
+ _diagnostics.error("rebase pointer does not point within cache. lastOffset=0x%04X, seg=%s, dylib=%s\n",
+ lastLocationOffset, segName.c_str(), dylibName.c_str());
+ return false;
+ }
+ if ( offset <= (lastLocationOffset+maxDelta) ) {
+ // previous location in range, make link from it
+ // encode this location into last value
+ pint_t delta = offset - lastLocationOffset;
+ pint_t newLastValue = ((lastValue - valueAdd) & valueMask) | (delta << deltaShift);
+ //warning(" add chain: delta = %d, lastOffset=0x%03X, offset=0x%03X, org value=0x%08lX, new value=0x%08lX",
+ // offset - lastLocationOffset, lastLocationOffset, offset, (long)lastValue, (long)newLastValue);
+ P::setP(*lastLoc, newLastValue);
+ return true;
+ }
+ //fprintf(stderr, " too big delta = %d, lastOffset=0x%03X, offset=0x%03X\n", offset - lastLocationOffset, lastLocationOffset, offset);
+
+ // distance between rebase locations is too far
+ // see if we can make a chain from non-rebase locations
+ uint16_t nonRebaseLocationOffsets[1024];
+ unsigned nrIndex = 0;
+ for (uint16_t i = lastLocationOffset; i < offset-maxDelta; ) {
+ nonRebaseLocationOffsets[nrIndex] = 0;
+ for (int j=maxDelta; j > 0; j -= 4) {
+ pint_t value = (pint_t)P::getP(*(pint_t*)&pageContent[i+j]);
+ if ( value == 0 ) {
+ // Steal values of 0 to be used in the rebase chain
+ nonRebaseLocationOffsets[nrIndex] = i+j;
+ break;
+ }
+ }
+ if ( nonRebaseLocationOffsets[nrIndex] == 0 ) {
+ lastValue = (pint_t)P::getP(*lastLoc);
+ pint_t newValue = ((lastValue - valueAdd) & valueMask);
+ //warning(" no way to make non-rebase delta chain, terminate off=0x%03X, old value=0x%08lX, new value=0x%08lX", lastLocationOffset, (long)value, (long)newValue);
+ P::setP(*lastLoc, newValue);
+ return false;
+ }
+ i = nonRebaseLocationOffsets[nrIndex];
+ ++nrIndex;
+ }
+
+ // we can make chain. go back and add each non-rebase location to chain
+ uint16_t prevOffset = lastLocationOffset;
+ pint_t* prevLoc = (pint_t*)&pageContent[prevOffset];
+ for (unsigned n=0; n < nrIndex; ++n) {
+ uint16_t nOffset = nonRebaseLocationOffsets[n];
+ assert(nOffset != 0);
+ pint_t* nLoc = (pint_t*)&pageContent[nOffset];
+ uint32_t delta2 = nOffset - prevOffset;
+ pint_t value = (pint_t)P::getP(*prevLoc);
+ pint_t newValue;
+ if ( value == 0 )
+ newValue = (delta2 << deltaShift);
+ else
+ newValue = ((value - valueAdd) & valueMask) | (delta2 << deltaShift);
+ //warning(" non-rebase delta = %d, to off=0x%03X, old value=0x%08lX, new value=0x%08lX", delta2, nOffset, (long)value, (long)newValue);
+ P::setP(*prevLoc, newValue);
+ prevOffset = nOffset;
+ prevLoc = nLoc;
+ }
+ uint32_t delta3 = offset - prevOffset;
+ pint_t value = (pint_t)P::getP(*prevLoc);
+ pint_t newValue;
+ if ( value == 0 )
+ newValue = (delta3 << deltaShift);
+ else
+ newValue = ((value - valueAdd) & valueMask) | (delta3 << deltaShift);
+ //warning(" non-rebase delta = %d, to off=0x%03X, old value=0x%08lX, new value=0x%08lX", delta3, offset, (long)value, (long)newValue);
+ P::setP(*prevLoc, newValue);
+
+ return true;
+}
+
+
+template <typename P>
+void CacheBuilder::addPageStartsV2(uint8_t* pageContent, const bool bitmap[], const dyld_cache_slide_info2* info,
+ std::vector<uint16_t>& pageStarts, std::vector<uint16_t>& pageExtras)
+{
+ typedef typename P::uint_t pint_t;
+
+ const pint_t deltaMask = (pint_t)(info->delta_mask);
+ const pint_t valueMask = ~deltaMask;
+ const uint32_t pageSize = info->page_size;
+ const pint_t valueAdd = (pint_t)(info->value_add);
+
+ uint16_t startValue = DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE;
+ uint16_t lastLocationOffset = 0xFFFF;
+ for(uint32_t i=0; i < pageSize/4; ++i) {
+ unsigned offset = i*4;
+ if ( bitmap[i] ) {
+ if ( startValue == DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE ) {
+ // found first rebase location in page
+ startValue = i;
+ }
+ else if ( !makeRebaseChainV2<P>(pageContent, lastLocationOffset, offset, info) ) {
+ // can't record all rebasings in one chain
+ if ( (startValue & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA) == 0 ) {
+ // switch page_start to "extras" which is a list of chain starts
+ unsigned indexInExtras = (unsigned)pageExtras.size();
+ if ( indexInExtras > 0x3FFF ) {
+ _diagnostics.error("rebase overflow in v2 page extras");
+ return;
+ }
+ pageExtras.push_back(startValue);
+ startValue = indexInExtras | DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA;
+ }
+ pageExtras.push_back(i);
+ }
+ lastLocationOffset = offset;
+ }
+ }
+ if ( lastLocationOffset != 0xFFFF ) {
+ // mark end of chain
+ pint_t* lastLoc = (pint_t*)&pageContent[lastLocationOffset];
+ pint_t lastValue = (pint_t)P::getP(*lastLoc);
+ pint_t newValue = ((lastValue - valueAdd) & valueMask);
+ P::setP(*lastLoc, newValue);
+ }
+ if ( startValue & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA ) {
+ // add end bit to extras
+ pageExtras.back() |= DYLD_CACHE_SLIDE_PAGE_ATTR_END;
+ }
+ pageStarts.push_back(startValue);
+}
+
+template <typename P>
+void CacheBuilder::writeSlideInfoV2(const bool bitmap[], unsigned dataPageCount)
+{
+ typedef typename P::uint_t pint_t;
+ typedef typename P::E E;
+ const uint32_t pageSize = 4096;
+
+ // fill in fixed info
+ assert(_slideInfoFileOffset != 0);
+ dyld_cache_slide_info2* info = (dyld_cache_slide_info2*)_readOnlyRegion.buffer;
+ info->version = 2;
+ info->page_size = pageSize;
+ info->delta_mask = _archLayout->pointerDeltaMask;
+ info->value_add = (sizeof(pint_t) == 8) ? 0 : _archLayout->sharedMemoryStart; // only value_add for 32-bit archs
+
+ // set page starts and extras for each page
+ std::vector<uint16_t> pageStarts;
+ std::vector<uint16_t> pageExtras;
+ pageStarts.reserve(dataPageCount);
+ uint8_t* pageContent = _readWriteRegion.buffer;
+ const bool* bitmapForPage = bitmap;
+ for (unsigned i=0; i < dataPageCount; ++i) {
+ //warning("page[%d]", i);
+ addPageStartsV2<P>(pageContent, bitmapForPage, info, pageStarts, pageExtras);
+ if ( _diagnostics.hasError() ) {
+ return;
+ }
+ pageContent += pageSize;
+ bitmapForPage += (sizeof(bool)*(pageSize/4));
+ }
+
+ // fill in computed info
+ info->page_starts_offset = sizeof(dyld_cache_slide_info2);
+ info->page_starts_count = (unsigned)pageStarts.size();
+ info->page_extras_offset = (unsigned)(sizeof(dyld_cache_slide_info2)+pageStarts.size()*sizeof(uint16_t));
+ info->page_extras_count = (unsigned)pageExtras.size();
+ uint16_t* pageStartsBuffer = (uint16_t*)((char*)info + info->page_starts_offset);
+ uint16_t* pageExtrasBuffer = (uint16_t*)((char*)info + info->page_extras_offset);
+ for (unsigned i=0; i < pageStarts.size(); ++i)
+ pageStartsBuffer[i] = pageStarts[i];
+ for (unsigned i=0; i < pageExtras.size(); ++i)
+ pageExtrasBuffer[i] = pageExtras[i];
+ // update header with final size
+ uint64_t slideInfoSize = align(info->page_extras_offset + pageExtras.size()*sizeof(uint16_t), _archLayout->sharedRegionAlignP2);
+ if ( slideInfoSize > _slideInfoBufferSizeAllocated ) {
+ _diagnostics.error("kernel slide info overflow buffer");
+ }
+ ((dyld_cache_header*)_readExecuteRegion.buffer)->slideInfoSize = slideInfoSize;
+ //fprintf(stderr, "pageCount=%u, page_starts_count=%lu, page_extras_count=%lu\n", dataPageCount, pageStarts.size(), pageExtras.size());
+}
+
+// fits in to int16_t
+static bool smallValue(uint64_t value)
+{
+ uint32_t high = (value & 0xFFFF8000);
+ return (high == 0) || (high == 0xFFFF8000);
+}
+
+template <typename P>
+bool CacheBuilder::makeRebaseChainV4(uint8_t* pageContent, uint16_t lastLocationOffset, uint16_t offset, const dyld_cache_slide_info4* info)
+{
+ typedef typename P::uint_t pint_t;
+
+ const pint_t deltaMask = (pint_t)(info->delta_mask);
+ const pint_t valueMask = ~deltaMask;
+ const pint_t valueAdd = (pint_t)(info->value_add);
+ const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2;
+ const uint32_t maxDelta = (uint32_t)(deltaMask >> deltaShift);
+
+ pint_t* lastLoc = (pint_t*)&pageContent[lastLocationOffset+0];
+ pint_t lastValue = (pint_t)P::getP(*lastLoc);
+ if ( (lastValue - valueAdd) & deltaMask ) {
+ std::string dylibName;
+ std::string segName;
+ findDylibAndSegment((void*)pageContent, dylibName, segName);
+ _diagnostics.error("rebase pointer does not point within cache. lastOffset=0x%04X, seg=%s, dylib=%s\n",
+ lastLocationOffset, segName.c_str(), dylibName.c_str());
+ return false;
+ }
+ if ( offset <= (lastLocationOffset+maxDelta) ) {
+ // previous location in range, make link from it
+ // encode this location into last value
+ pint_t delta = offset - lastLocationOffset;
+ pint_t newLastValue = ((lastValue - valueAdd) & valueMask) | (delta << deltaShift);
+ //warning(" add chain: delta = %d, lastOffset=0x%03X, offset=0x%03X, org value=0x%08lX, new value=0x%08lX",
+ // offset - lastLocationOffset, lastLocationOffset, offset, (long)lastValue, (long)newLastValue);
+ P::setP(*lastLoc, newLastValue);
+ return true;
+ }
+ //fprintf(stderr, " too big delta = %d, lastOffset=0x%03X, offset=0x%03X\n", offset - lastLocationOffset, lastLocationOffset, offset);
+
+ // distance between rebase locations is too far
+ // see if we can make a chain from non-rebase locations
+ uint16_t nonRebaseLocationOffsets[1024];
+ unsigned nrIndex = 0;
+ for (uint16_t i = lastLocationOffset; i < offset-maxDelta; ) {
+ nonRebaseLocationOffsets[nrIndex] = 0;
+ for (int j=maxDelta; j > 0; j -= 4) {
+ pint_t value = (pint_t)P::getP(*(pint_t*)&pageContent[i+j]);
+ if ( smallValue(value) ) {
+ // Steal values of 0 to be used in the rebase chain
+ nonRebaseLocationOffsets[nrIndex] = i+j;
+ break;
+ }
+ }
+ if ( nonRebaseLocationOffsets[nrIndex] == 0 ) {
+ lastValue = (pint_t)P::getP(*lastLoc);
+ pint_t newValue = ((lastValue - valueAdd) & valueMask);
+ //fprintf(stderr, " no way to make non-rebase delta chain, terminate off=0x%03X, old value=0x%08lX, new value=0x%08lX\n",
+ // lastLocationOffset, (long)lastValue, (long)newValue);
+ P::setP(*lastLoc, newValue);
+ return false;
+ }
+ i = nonRebaseLocationOffsets[nrIndex];
+ ++nrIndex;
+ }
+
+ // we can make chain. go back and add each non-rebase location to chain
+ uint16_t prevOffset = lastLocationOffset;
+ pint_t* prevLoc = (pint_t*)&pageContent[prevOffset];
+ for (unsigned n=0; n < nrIndex; ++n) {
+ uint16_t nOffset = nonRebaseLocationOffsets[n];
+ assert(nOffset != 0);
+ pint_t* nLoc = (pint_t*)&pageContent[nOffset];
+ uint32_t delta2 = nOffset - prevOffset;
+ pint_t value = (pint_t)P::getP(*prevLoc);
+ pint_t newValue;
+ if ( smallValue(value) )
+ newValue = (value & valueMask) | (delta2 << deltaShift);
+ else
+ newValue = ((value - valueAdd) & valueMask) | (delta2 << deltaShift);
+ //warning(" non-rebase delta = %d, to off=0x%03X, old value=0x%08lX, new value=0x%08lX", delta2, nOffset, (long)value, (long)newValue);
+ P::setP(*prevLoc, newValue);
+ prevOffset = nOffset;
+ prevLoc = nLoc;
+ }
+ uint32_t delta3 = offset - prevOffset;
+ pint_t value = (pint_t)P::getP(*prevLoc);
+ pint_t newValue;
+ if ( smallValue(value) )
+ newValue = (value & valueMask) | (delta3 << deltaShift);
+ else
+ newValue = ((value - valueAdd) & valueMask) | (delta3 << deltaShift);
+ //warning(" non-rebase delta = %d, to off=0x%03X, old value=0x%08lX, new value=0x%08lX", delta3, offset, (long)value, (long)newValue);
+ P::setP(*prevLoc, newValue);
+
+ return true;
+}
+
+
+template <typename P>
+void CacheBuilder::addPageStartsV4(uint8_t* pageContent, const bool bitmap[], const dyld_cache_slide_info4* info,
+ std::vector<uint16_t>& pageStarts, std::vector<uint16_t>& pageExtras)
+{
+ typedef typename P::uint_t pint_t;
+
+ const pint_t deltaMask = (pint_t)(info->delta_mask);
+ const pint_t valueMask = ~deltaMask;
+ const uint32_t pageSize = info->page_size;
+ const pint_t valueAdd = (pint_t)(info->value_add);
+
+ uint16_t startValue = DYLD_CACHE_SLIDE4_PAGE_NO_REBASE;
+ uint16_t lastLocationOffset = 0xFFFF;
+ for(uint32_t i=0; i < pageSize/4; ++i) {
+ unsigned offset = i*4;
+ if ( bitmap[i] ) {
+ if ( startValue == DYLD_CACHE_SLIDE4_PAGE_NO_REBASE ) {
+ // found first rebase location in page
+ startValue = i;
+ }
+ else if ( !makeRebaseChainV4<P>(pageContent, lastLocationOffset, offset, info) ) {
+ // can't record all rebasings in one chain
+ if ( (startValue & DYLD_CACHE_SLIDE4_PAGE_USE_EXTRA) == 0 ) {
+ // switch page_start to "extras" which is a list of chain starts
+ unsigned indexInExtras = (unsigned)pageExtras.size();
+ if ( indexInExtras >= DYLD_CACHE_SLIDE4_PAGE_INDEX ) {
+ _diagnostics.error("rebase overflow in v4 page extras");
+ return;
+ }
+ pageExtras.push_back(startValue);
+ startValue = indexInExtras | DYLD_CACHE_SLIDE4_PAGE_USE_EXTRA;
+ }
+ pageExtras.push_back(i);
+ }
+ lastLocationOffset = offset;
+ }
+ }
+ if ( lastLocationOffset != 0xFFFF ) {
+ // mark end of chain
+ pint_t* lastLoc = (pint_t*)&pageContent[lastLocationOffset];
+ pint_t lastValue = (pint_t)P::getP(*lastLoc);
+ pint_t newValue = ((lastValue - valueAdd) & valueMask);
+ P::setP(*lastLoc, newValue);
+ }
+ if ( startValue & DYLD_CACHE_SLIDE4_PAGE_USE_EXTRA ) {
+ // add end bit to extras
+ pageExtras.back() |= DYLD_CACHE_SLIDE4_PAGE_EXTRA_END;
+ }
+ pageStarts.push_back(startValue);
+}
+
+
+
+template <typename P>
+void CacheBuilder::writeSlideInfoV4(const bool bitmap[], unsigned dataPageCount)
+{
+ typedef typename P::uint_t pint_t;
+ typedef typename P::E E;
+ const uint32_t pageSize = 4096;
+
+ // fill in fixed info
+ assert(_slideInfoFileOffset != 0);
+ dyld_cache_slide_info4* info = (dyld_cache_slide_info4*)_readOnlyRegion.buffer;
+ info->version = 4;
+ info->page_size = pageSize;
+ info->delta_mask = _archLayout->pointerDeltaMask;
+ info->value_add = (sizeof(pint_t) == 8) ? 0 : _archLayout->sharedMemoryStart; // only value_add for 32-bit archs
+
+ // set page starts and extras for each page
+ std::vector<uint16_t> pageStarts;
+ std::vector<uint16_t> pageExtras;
+ pageStarts.reserve(dataPageCount);
+ uint8_t* pageContent = _readWriteRegion.buffer;
+ const bool* bitmapForPage = bitmap;
+ for (unsigned i=0; i < dataPageCount; ++i) {
+ addPageStartsV4<P>(pageContent, bitmapForPage, info, pageStarts, pageExtras);
+ if ( _diagnostics.hasError() ) {
+ return;
+ }
+ pageContent += pageSize;
+ bitmapForPage += (sizeof(bool)*(pageSize/4));
+ }
+ // fill in computed info
+ info->page_starts_offset = sizeof(dyld_cache_slide_info4);
+ info->page_starts_count = (unsigned)pageStarts.size();
+ info->page_extras_offset = (unsigned)(sizeof(dyld_cache_slide_info4)+pageStarts.size()*sizeof(uint16_t));
+ info->page_extras_count = (unsigned)pageExtras.size();
+ uint16_t* pageStartsBuffer = (uint16_t*)((char*)info + info->page_starts_offset);
+ uint16_t* pageExtrasBuffer = (uint16_t*)((char*)info + info->page_extras_offset);
+ for (unsigned i=0; i < pageStarts.size(); ++i)
+ pageStartsBuffer[i] = pageStarts[i];
+ for (unsigned i=0; i < pageExtras.size(); ++i)
+ pageExtrasBuffer[i] = pageExtras[i];
+ // update header with final size
+ uint64_t slideInfoSize = align(info->page_extras_offset + pageExtras.size()*sizeof(uint16_t), _archLayout->sharedRegionAlignP2);
+ if ( slideInfoSize > _slideInfoBufferSizeAllocated ) {
+ _diagnostics.error("kernel slide info v4 overflow buffer");
+ }
+ ((dyld_cache_header*)_readExecuteRegion.buffer)->slideInfoSize = slideInfoSize;
+ //fprintf(stderr, "pageCount=%u, page_starts_count=%lu, page_extras_count=%lu\n", dataPageCount, pageStarts.size(), pageExtras.size());
+}
+
+
+/*
+void CacheBuilder::writeSlideInfoV1()
+{
+ // build one 128-byte bitmap per page (4096) of DATA
+ uint8_t* const dataStart = (uint8_t*)_buffer.get() + regions[1].fileOffset;
+ uint8_t* const dataEnd = dataStart + regions[1].size;
+ const long bitmapSize = (dataEnd - dataStart)/(4*8);
+ uint8_t* bitmap = (uint8_t*)calloc(bitmapSize, 1);
+ for (void* p : _pointersForASLR) {
+ if ( (p < dataStart) || ( p > dataEnd) )
+ terminate("DATA pointer for sliding, out of range\n");
+ long offset = (long)((uint8_t*)p - dataStart);
+ if ( (offset % 4) != 0 )
+ terminate("pointer not 4-byte aligned in DATA offset 0x%08lX\n", offset);
+ long byteIndex = offset / (4*8);
+ long bitInByte = (offset % 32) >> 2;
+ bitmap[byteIndex] |= (1 << bitInByte);
+ }
+
+ // allocate worst case size block of all slide info
+ const unsigned entry_size = 4096/(8*4); // 8 bits per byte, possible pointer every 4 bytes.
+ const unsigned toc_count = (unsigned)bitmapSize/entry_size;
+ dyld_cache_slide_info* slideInfo = (dyld_cache_slide_info*)((uint8_t*)_buffer + _slideInfoFileOffset);
+ slideInfo->version = 1;
+ slideInfo->toc_offset = sizeof(dyld_cache_slide_info);
+ slideInfo->toc_count = toc_count;
+ slideInfo->entries_offset = (slideInfo->toc_offset+2*toc_count+127)&(-128);
+ slideInfo->entries_count = 0;
+ slideInfo->entries_size = entry_size;
+ // append each unique entry
+ const dyldCacheSlideInfoEntry* bitmapAsEntries = (dyldCacheSlideInfoEntry*)bitmap;
+ dyldCacheSlideInfoEntry* const entriesInSlidInfo = (dyldCacheSlideInfoEntry*)((char*)slideInfo+slideInfo->entries_offset());
+ int entry_count = 0;
+ for (int i=0; i < toc_count; ++i) {
+ const dyldCacheSlideInfoEntry* thisEntry = &bitmapAsEntries[i];
+ // see if it is same as one already added
+ bool found = false;
+ for (int j=0; j < entry_count; ++j) {
+ if ( memcmp(thisEntry, &entriesInSlidInfo[j], entry_size) == 0 ) {
+ slideInfo->set_toc(i, j);
+ found = true;
+ break;
+ }
+ }
+ if ( !found ) {
+ // append to end
+ memcpy(&entriesInSlidInfo[entry_count], thisEntry, entry_size);
+ slideInfo->set_toc(i, entry_count++);
+ }
+ }
+ slideInfo->entries_count = entry_count;
+ ::free((void*)bitmap);
+
+ _buffer.header->slideInfoSize = align(slideInfo->entries_offset + entry_count*entry_size, _archLayout->sharedRegionAlignP2);
+}
+
+*/
+
+
+
+uint16_t CacheBuilder::pageStartV3(uint8_t* pageContent, uint32_t pageSize, const bool bitmap[])
+{
+ const int maxPerPage = pageSize / 4;
+ uint16_t result = DYLD_CACHE_SLIDE_V3_PAGE_ATTR_NO_REBASE;
+ dyld3::MachOLoaded::ChainedFixupPointerOnDisk* lastLoc = nullptr;
+ for (int i=0; i < maxPerPage; ++i) {
+ if ( bitmap[i] ) {
+ if ( result == DYLD_CACHE_SLIDE_V3_PAGE_ATTR_NO_REBASE ) {
+ // found first rebase location in page
+ result = i * 4;
+ }
+ dyld3::MachOLoaded::ChainedFixupPointerOnDisk* loc = (dyld3::MachOLoaded::ChainedFixupPointerOnDisk*)(pageContent + i*4);;
+ if ( lastLoc != nullptr ) {
+ // update chain (original chain may be wrong because of segment packing)
+ lastLoc->plainRebase.next = loc - lastLoc;
+ }
+ lastLoc = loc;
+ }
+ }
+ if ( lastLoc != nullptr ) {
+ // mark last one as end of chain
+ lastLoc->plainRebase.next = 0;
+ }
+ return result;
+}
+
+
+void CacheBuilder::writeSlideInfoV3(const bool bitmap[], unsigned dataPageCount)
+{
+ const uint32_t pageSize = 4096;
+
+ // fill in fixed info
+ assert(_slideInfoFileOffset != 0);
+ dyld_cache_slide_info3* info = (dyld_cache_slide_info3*)_readOnlyRegion.buffer;
+ info->version = 3;
+ info->page_size = pageSize;
+ info->page_starts_count = dataPageCount;
+ info->auth_value_add = _archLayout->sharedMemoryStart;
+
+ // fill in per-page starts
+ uint8_t* pageContent = _readWriteRegion.buffer;
+ const bool* bitmapForPage = bitmap;
+ for (unsigned i=0; i < dataPageCount; ++i) {
+ info->page_starts[i] = pageStartV3(pageContent, pageSize, bitmapForPage);
+ pageContent += pageSize;
+ bitmapForPage += (sizeof(bool)*(pageSize/4));
+ }
+
+ // update header with final size
+ dyld_cache_header* dyldCacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer;
+ dyldCacheHeader->slideInfoSize = align(__offsetof(dyld_cache_slide_info3, page_starts[dataPageCount]), _archLayout->sharedRegionAlignP2);
+ if ( dyldCacheHeader->slideInfoSize > _slideInfoBufferSizeAllocated ) {
+ _diagnostics.error("kernel slide info overflow buffer");
+ }
+}
+
+
+void CacheBuilder::fipsSign()
+{
+ // find libcorecrypto.dylib in cache being built
+ DyldSharedCache* dyldCache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ __block const dyld3::MachOLoaded* ml = nullptr;
+ dyldCache->forEachImage(^(const mach_header* mh, const char* installName) {
+ if ( strcmp(installName, "/usr/lib/system/libcorecrypto.dylib") == 0 )
+ ml = (dyld3::MachOLoaded*)mh;
+ });
+ if ( ml == nullptr ) {
+ _diagnostics.warning("Could not find libcorecrypto.dylib, skipping FIPS sealing");
return;
-
- // Every atom should have a single rebase to a cstring
- if ( sectionRebases.size() != atomOffsets.size() )
+ }
+
+ // find location in libcorecrypto.dylib to store hash of __text section
+ uint64_t hashStoreSize;
+ const void* hashStoreLocation = ml->findSectionContent("__TEXT", "__fips_hmacs", hashStoreSize);
+ if ( hashStoreLocation == nullptr ) {
+ _diagnostics.warning("Could not find __TEXT/__fips_hmacs section in libcorecrypto.dylib, skipping FIPS sealing");
return;
-
- std::sort(atomOffsets.begin(), atomOffsets.end());
- for (uint64_t atomOffset : atomOffsets) {
- auto it = sectionRebases.find(atomOffset + cstringDataOffset);
- if ( it == sectionRebases.end() )
+ }
+ if ( hashStoreSize != 32 ) {
+ _diagnostics.warning("__TEXT/__fips_hmacs section in libcorecrypto.dylib is not 32 bytes in size, skipping FIPS sealing");
+ return;
+ }
+
+ // compute hmac hash of __text section
+ uint64_t textSize;
+ const void* textLocation = ml->findSectionContent("__TEXT", "__text", textSize);
+ if ( textLocation == nullptr ) {
+ _diagnostics.warning("Could not find __TEXT/__text section in libcorecrypto.dylib, skipping FIPS sealing");
+ return;
+ }
+ unsigned char hmac_key = 0;
+ CCHmac(kCCHmacAlgSHA256, &hmac_key, 1, textLocation, textSize, (void*)hashStoreLocation); // store hash directly into hashStoreLocation
+}
+
+void CacheBuilder::codeSign()
+{
+ uint8_t dscHashType;
+ uint8_t dscHashSize;
+ uint32_t dscDigestFormat;
+ bool agile = false;
+
+ // select which codesigning hash
+ switch (_options.codeSigningDigestMode) {
+ case DyldSharedCache::Agile:
+ agile = true;
+ // Fall through to SHA1, because the main code directory remains SHA1 for compatibility.
+ case DyldSharedCache::SHA1only:
+ dscHashType = CS_HASHTYPE_SHA1;
+ dscHashSize = CS_HASH_SIZE_SHA1;
+ dscDigestFormat = kCCDigestSHA1;
+ break;
+ case DyldSharedCache::SHA256only:
+ dscHashType = CS_HASHTYPE_SHA256;
+ dscHashSize = CS_HASH_SIZE_SHA256;
+ dscDigestFormat = kCCDigestSHA256;
+ break;
+ default:
+ _diagnostics.error("codeSigningDigestMode has unknown, unexpected value %d, bailing out.",
+ _options.codeSigningDigestMode);
return;
}
- CFSection& stringSection = this->cfStrings;
- DylibTextCoalescer::DylibSectionOffsetToCacheSectionOffset& sectionData = textCoalescer.getSectionCoalescer("__OBJC_CONST", "__cfstring");
- for (uint64_t atomOffset : atomOffsets) {
- if ( log )
- printf("%s: found __cfstring at: 0x%llx\n", ma->installName(), atomOffset);
-
- // Now keep track of this offset in our source dylib as pointing to this offset
- uint32_t sourceSectionOffset = (uint32_t)(atomOffset - startVMOffset);
- uint32_t cacheSectionOffset = stringSection.bufferSize;
- sectionData[sourceSectionOffset] = cacheSectionOffset;
- stringSection.bufferSize += (uint32_t)DyldSharedCache::ConstantClasses::cfStringAtomSize;
- }
-}
-
-void CacheBuilder::CacheCoalescedText::clear() {
- *this = CacheBuilder::CacheCoalescedText();
-}
-
-
-CacheBuilder::CacheCoalescedText::StringSection& CacheBuilder::CacheCoalescedText::getSectionData(std::string_view sectionName) {
- if (sectionName.size() > 16)
- sectionName = sectionName.substr(0, 16);
- std::map<std::string_view, StringSection*> supportedSections = {
- { "__objc_classname", &objcClassNames },
- { "__objc_methname", &objcMethNames },
- { "__objc_methtype", &objcMethTypes }
+ std::string cacheIdentifier = "com.apple.dyld.cache." + _options.archName;
+ if ( _options.dylibsRemovedDuringMastering ) {
+ if ( _options.optimizeStubs )
+ cacheIdentifier = "com.apple.dyld.cache." + _options.archName + ".release";
+ else
+ cacheIdentifier = "com.apple.dyld.cache." + _options.archName + ".development";
+ }
+ // get pointers into shared cache buffer
+ size_t inBbufferSize = _readExecuteRegion.sizeInUse+_readWriteRegion.sizeInUse+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse;
+
+ // layout code signature contents
+ uint32_t blobCount = agile ? 4 : 3;
+ size_t idSize = cacheIdentifier.size()+1; // +1 for terminating 0
+ uint32_t slotCount = (uint32_t)((inBbufferSize + CS_PAGE_SIZE - 1) / CS_PAGE_SIZE);
+ uint32_t xSlotCount = CSSLOT_REQUIREMENTS;
+ size_t idOffset = offsetof(CS_CodeDirectory, end_withExecSeg);
+ size_t hashOffset = idOffset+idSize + dscHashSize*xSlotCount;
+ size_t hash256Offset = idOffset+idSize + CS_HASH_SIZE_SHA256*xSlotCount;
+ size_t cdSize = hashOffset + (slotCount * dscHashSize);
+ size_t cd256Size = agile ? hash256Offset + (slotCount * CS_HASH_SIZE_SHA256) : 0;
+ size_t reqsSize = 12;
+ size_t cmsSize = sizeof(CS_Blob);
+ size_t cdOffset = sizeof(CS_SuperBlob) + blobCount*sizeof(CS_BlobIndex);
+ size_t cd256Offset = cdOffset + cdSize;
+ size_t reqsOffset = cd256Offset + cd256Size; // equals cdOffset + cdSize if not agile
+ size_t cmsOffset = reqsOffset + reqsSize;
+ size_t sbSize = cmsOffset + cmsSize;
+ size_t sigSize = align(sbSize, 14); // keep whole cache 16KB aligned
+
+ // allocate space for blob
+ vm_address_t codeSigAlloc;
+ if ( vm_allocate(mach_task_self(), &codeSigAlloc, sigSize, VM_FLAGS_ANYWHERE) != 0 ) {
+ _diagnostics.error("could not allocate code signature buffer");
+ return;
+ }
+ _codeSignatureRegion.buffer = (uint8_t*)codeSigAlloc;
+ _codeSignatureRegion.bufferSize = sigSize;
+ _codeSignatureRegion.sizeInUse = sigSize;
+
+ // create overall code signature which is a superblob
+ CS_SuperBlob* sb = reinterpret_cast<CS_SuperBlob*>(_codeSignatureRegion.buffer);
+ sb->magic = htonl(CSMAGIC_EMBEDDED_SIGNATURE);
+ sb->length = htonl(sbSize);
+ sb->count = htonl(blobCount);
+ sb->index[0].type = htonl(CSSLOT_CODEDIRECTORY);
+ sb->index[0].offset = htonl(cdOffset);
+ sb->index[1].type = htonl(CSSLOT_REQUIREMENTS);
+ sb->index[1].offset = htonl(reqsOffset);
+ sb->index[2].type = htonl(CSSLOT_CMS_SIGNATURE);
+ sb->index[2].offset = htonl(cmsOffset);
+ if ( agile ) {
+ sb->index[3].type = htonl(CSSLOT_ALTERNATE_CODEDIRECTORIES + 0);
+ sb->index[3].offset = htonl(cd256Offset);
+ }
+
+ // fill in empty requirements
+ CS_RequirementsBlob* reqs = (CS_RequirementsBlob*)(((char*)sb)+reqsOffset);
+ reqs->magic = htonl(CSMAGIC_REQUIREMENTS);
+ reqs->length = htonl(sizeof(CS_RequirementsBlob));
+ reqs->data = 0;
+
+ // initialize fixed fields of Code Directory
+ CS_CodeDirectory* cd = (CS_CodeDirectory*)(((char*)sb)+cdOffset);
+ cd->magic = htonl(CSMAGIC_CODEDIRECTORY);
+ cd->length = htonl(cdSize);
+ cd->version = htonl(0x20400); // supports exec segment
+ cd->flags = htonl(kSecCodeSignatureAdhoc);
+ cd->hashOffset = htonl(hashOffset);
+ cd->identOffset = htonl(idOffset);
+ cd->nSpecialSlots = htonl(xSlotCount);
+ cd->nCodeSlots = htonl(slotCount);
+ cd->codeLimit = htonl(inBbufferSize);
+ cd->hashSize = dscHashSize;
+ cd->hashType = dscHashType;
+ cd->platform = 0; // not platform binary
+ cd->pageSize = __builtin_ctz(CS_PAGE_SIZE); // log2(CS_PAGE_SIZE);
+ cd->spare2 = 0; // unused (must be zero)
+ cd->scatterOffset = 0; // not supported anymore
+ cd->teamOffset = 0; // no team ID
+ cd->spare3 = 0; // unused (must be zero)
+ cd->codeLimit64 = 0; // falls back to codeLimit
+
+ // executable segment info
+ cd->execSegBase = htonll(_readExecuteRegion.cacheFileOffset); // base of TEXT segment
+ cd->execSegLimit = htonll(_readExecuteRegion.sizeInUse); // size of TEXT segment
+ cd->execSegFlags = 0; // not a main binary
+
+ // initialize dynamic fields of Code Directory
+ strcpy((char*)cd + idOffset, cacheIdentifier.c_str());
+
+ // add special slot hashes
+ uint8_t* hashSlot = (uint8_t*)cd + hashOffset;
+ uint8_t* reqsHashSlot = &hashSlot[-CSSLOT_REQUIREMENTS*dscHashSize];
+ CCDigest(dscDigestFormat, (uint8_t*)reqs, sizeof(CS_RequirementsBlob), reqsHashSlot);
+
+ CS_CodeDirectory* cd256;
+ uint8_t* hash256Slot;
+ uint8_t* reqsHash256Slot;
+ if ( agile ) {
+ // Note that the assumption here is that the size up to the hashes is the same as for
+ // sha1 code directory, and that they come last, after everything else.
+
+ cd256 = (CS_CodeDirectory*)(((char*)sb)+cd256Offset);
+ cd256->magic = htonl(CSMAGIC_CODEDIRECTORY);
+ cd256->length = htonl(cd256Size);
+ cd256->version = htonl(0x20400); // supports exec segment
+ cd256->flags = htonl(kSecCodeSignatureAdhoc);
+ cd256->hashOffset = htonl(hash256Offset);
+ cd256->identOffset = htonl(idOffset);
+ cd256->nSpecialSlots = htonl(xSlotCount);
+ cd256->nCodeSlots = htonl(slotCount);
+ cd256->codeLimit = htonl(inBbufferSize);
+ cd256->hashSize = CS_HASH_SIZE_SHA256;
+ cd256->hashType = CS_HASHTYPE_SHA256;
+ cd256->platform = 0; // not platform binary
+ cd256->pageSize = __builtin_ctz(CS_PAGE_SIZE); // log2(CS_PAGE_SIZE);
+ cd256->spare2 = 0; // unused (must be zero)
+ cd256->scatterOffset = 0; // not supported anymore
+ cd256->teamOffset = 0; // no team ID
+ cd256->spare3 = 0; // unused (must be zero)
+ cd256->codeLimit64 = 0; // falls back to codeLimit
+
+ // executable segment info
+ cd256->execSegBase = cd->execSegBase;
+ cd256->execSegLimit = cd->execSegLimit;
+ cd256->execSegFlags = cd->execSegFlags;
+
+ // initialize dynamic fields of Code Directory
+ strcpy((char*)cd256 + idOffset, cacheIdentifier.c_str());
+
+ // add special slot hashes
+ hash256Slot = (uint8_t*)cd256 + hash256Offset;
+ reqsHash256Slot = &hash256Slot[-CSSLOT_REQUIREMENTS*CS_HASH_SIZE_SHA256];
+ CCDigest(kCCDigestSHA256, (uint8_t*)reqs, sizeof(CS_RequirementsBlob), reqsHash256Slot);
+ }
+ else {
+ cd256 = NULL;
+ hash256Slot = NULL;
+ reqsHash256Slot = NULL;
+ }
+
+ // fill in empty CMS blob for ad-hoc signing
+ CS_Blob* cms = (CS_Blob*)(((char*)sb)+cmsOffset);
+ cms->magic = htonl(CSMAGIC_BLOBWRAPPER);
+ cms->length = htonl(sizeof(CS_Blob));
+
+
+ // alter header of cache to record size and location of code signature
+ // do this *before* hashing each page
+ dyld_cache_header* cache = (dyld_cache_header*)_readExecuteRegion.buffer;
+ cache->codeSignatureOffset = inBbufferSize;
+ cache->codeSignatureSize = sigSize;
+
+ const uint32_t rwSlotStart = (uint32_t)(_readExecuteRegion.sizeInUse / CS_PAGE_SIZE);
+ const uint32_t roSlotStart = (uint32_t)(rwSlotStart + _readWriteRegion.sizeInUse / CS_PAGE_SIZE);
+ const uint32_t localsSlotStart = (uint32_t)(roSlotStart + _readOnlyRegion.sizeInUse / CS_PAGE_SIZE);
+ auto codeSignPage = ^(size_t i) {
+ const uint8_t* code = nullptr;
+ // move to correct region
+ if ( i < rwSlotStart )
+ code = _readExecuteRegion.buffer + (i * CS_PAGE_SIZE);
+ else if ( i >= rwSlotStart && i < roSlotStart )
+ code = _readWriteRegion.buffer + ((i - rwSlotStart) * CS_PAGE_SIZE);
+ else if ( i >= roSlotStart && i < localsSlotStart )
+ code = _readOnlyRegion.buffer + ((i - roSlotStart) * CS_PAGE_SIZE);
+ else
+ code = _localSymbolsRegion.buffer + ((i - localsSlotStart) * CS_PAGE_SIZE);
+
+ CCDigest(dscDigestFormat, code, CS_PAGE_SIZE, hashSlot + (i * dscHashSize));
+
+ if ( agile ) {
+ CCDigest(kCCDigestSHA256, code, CS_PAGE_SIZE, hash256Slot + (i * CS_HASH_SIZE_SHA256));
+ }
};
- auto it = supportedSections.find(sectionName);
- assert(it != supportedSections.end());
- return *it->second;
-}
-
-
-const CacheBuilder::CacheCoalescedText::StringSection& CacheBuilder::CacheCoalescedText::getSectionData(std::string_view sectionName) const {
- if (sectionName.size() > 16)
- sectionName = sectionName.substr(0, 16);
- std::map<std::string_view, const StringSection*> supportedSections = {
- { "__objc_classname", &objcClassNames },
- { "__objc_methname", &objcMethNames },
- { "__objc_methtype", &objcMethTypes }
+
+ // compute hashes
+ dispatch_apply(slotCount, DISPATCH_APPLY_AUTO, ^(size_t i) {
+ codeSignPage(i);
+ });
+
+ // Now that we have a code signature, compute a UUID from it.
+
+ // Clear existing UUID, then MD5 whole cache buffer.
+ {
+ uint8_t* uuidLoc = cache->uuid;
+ assert(uuid_is_null(uuidLoc));
+ static_assert(offsetof(dyld_cache_header, uuid) / CS_PAGE_SIZE == 0, "uuid is expected in the first page of the cache");
+ CC_MD5((const void*)cd, (unsigned)cdSize, uuidLoc);
+ // <rdar://problem/6723729> uuids should conform to RFC 4122 UUID version 4 & UUID version 5 formats
+ uuidLoc[6] = ( uuidLoc[6] & 0x0F ) | ( 3 << 4 );
+ uuidLoc[8] = ( uuidLoc[8] & 0x3F ) | 0x80;
+
+ // Now codesign page 0 again
+ codeSignPage(0);
+ }
+
+ // hash of entire code directory (cdHash) uses same hash as each page
+ uint8_t fullCdHash[dscHashSize];
+ CCDigest(dscDigestFormat, (const uint8_t*)cd, cdSize, fullCdHash);
+ // Note: cdHash is defined as first 20 bytes of hash
+ memcpy(_cdHashFirst, fullCdHash, 20);
+ if ( agile ) {
+ uint8_t fullCdHash256[CS_HASH_SIZE_SHA256];
+ CCDigest(kCCDigestSHA256, (const uint8_t*)cd256, cd256Size, fullCdHash256);
+ // Note: cdHash is defined as first 20 bytes of hash, even for sha256
+ memcpy(_cdHashSecond, fullCdHash256, 20);
+ }
+ else {
+ memset(_cdHashSecond, 0, 20);
+ }
+}
+
+const bool CacheBuilder::agileSignature()
+{
+ return _options.codeSigningDigestMode == DyldSharedCache::Agile;
+}
+
+static const std::string cdHash(uint8_t hash[20])
+{
+ char buff[48];
+ for (int i = 0; i < 20; ++i)
+ sprintf(&buff[2*i], "%2.2x", hash[i]);
+ return buff;
+}
+
+const std::string CacheBuilder::cdHashFirst()
+{
+ return cdHash(_cdHashFirst);
+}
+
+const std::string CacheBuilder::cdHashSecond()
+{
+ return cdHash(_cdHashSecond);
+}
+
+
+void CacheBuilder::buildImageArray(std::vector<DyldSharedCache::FileAlias>& aliases)
+{
+ typedef dyld3::closure::ClosureBuilder::CachedDylibInfo CachedDylibInfo;
+ typedef dyld3::closure::Image::PatchableExport::PatchLocation PatchLocation;
+ typedef uint64_t CacheOffset;
+
+ // convert STL data structures to simple arrays to passe to makeDyldCacheImageArray()
+ __block std::vector<CachedDylibInfo> dylibInfos;
+ __block std::unordered_map<dyld3::closure::ImageNum, const dyld3::MachOLoaded*> imageNumToML;
+ DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ cache->forEachImage(^(const mach_header* mh, const char* installName) {
+ uint64_t mtime;
+ uint64_t inode;
+ cache->getIndexedImageEntry((uint32_t)dylibInfos.size(), mtime, inode);
+ CachedDylibInfo entry;
+ entry.fileInfo.fileContent = mh;
+ entry.fileInfo.path = installName;
+ entry.fileInfo.sliceOffset = 0;
+ entry.fileInfo.inode = inode;
+ entry.fileInfo.mtime = mtime;
+ dylibInfos.push_back(entry);
+ imageNumToML[(dyld3::closure::ImageNum)(dylibInfos.size())] = (dyld3::MachOLoaded*)mh;
+ });
+
+ // Convert symlinks from STL to simple char pointers.
+ std::vector<dyld3::closure::ClosureBuilder::CachedDylibAlias> dylibAliases;
+ dylibAliases.reserve(aliases.size());
+ for (const auto& alias : aliases)
+ dylibAliases.push_back({ alias.realPath.c_str(), alias.aliasPath.c_str() });
+
+
+ __block std::unordered_map<const dyld3::MachOLoaded*, std::set<CacheOffset>> dylibToItsExports;
+ __block std::unordered_map<CacheOffset, std::vector<PatchLocation>> exportsToUses;
+ __block std::unordered_map<CacheOffset, const char*> exportsToName;
+
+ dyld3::closure::ClosureBuilder::CacheDylibsBindingHandlers handlers;
+
+ handlers.chainedBind = ^(dyld3::closure::ImageNum, const dyld3::MachOLoaded* imageLoadAddress,
+ const dyld3::Array<uint64_t>& starts,
+ const dyld3::Array<dyld3::closure::Image::ResolvedSymbolTarget>& targets,
+ const dyld3::Array<dyld3::closure::ClosureBuilder::ResolvedTargetInfo>& targetInfos) {
+ for (uint64_t start : starts) {
+ dyld3::closure::Image::forEachChainedFixup((void*)imageLoadAddress, start, ^(uint64_t* fixupLoc, dyld3::MachOLoaded::ChainedFixupPointerOnDisk fixupInfo, bool& stop) {
+ // record location in aslr tracker so kernel can slide this on page-in
+ _aslrTracker.add(fixupLoc);
+
+ // if bind, record info for patch table and convert to rebase
+ if ( fixupInfo.plainBind.bind ) {
+ dyld3::closure::Image::ResolvedSymbolTarget target = targets[fixupInfo.plainBind.ordinal];
+ const dyld3::closure::ClosureBuilder::ResolvedTargetInfo& targetInfo = targetInfos[fixupInfo.plainBind.ordinal];
+ dyld3::MachOLoaded::ChainedFixupPointerOnDisk* loc;
+ uint64_t offsetInCache;
+ switch ( target.sharedCache.kind ) {
+ case dyld3::closure::Image::ResolvedSymbolTarget::kindSharedCache:
+ loc = (dyld3::MachOLoaded::ChainedFixupPointerOnDisk*)fixupLoc;
+ offsetInCache = target.sharedCache.offset - targetInfo.addend;
+ dylibToItsExports[targetInfo.foundInDylib].insert(offsetInCache);
+ exportsToName[offsetInCache] = targetInfo.foundSymbolName;
+ if ( fixupInfo.authBind.auth ) {
+ // turn this auth bind into an auth rebase into the cache
+ loc->authRebase.bind = 0;
+ loc->authRebase.target = target.sharedCache.offset;
+ exportsToUses[offsetInCache].push_back(PatchLocation((uint8_t*)fixupLoc - _readExecuteRegion.buffer, targetInfo.addend, *loc));
+ }
+ else {
+ // turn this plain bind into an plain rebase into the cache
+ loc->plainRebase.bind = 0;
+ loc->plainRebase.target = _archLayout->sharedMemoryStart + target.sharedCache.offset;
+ exportsToUses[offsetInCache].push_back(PatchLocation((uint8_t*)fixupLoc - _readExecuteRegion.buffer, targetInfo.addend));
+ }
+ break;
+ case dyld3::closure::Image::ResolvedSymbolTarget::kindAbsolute:
+ if ( _archLayout->is64 )
+ *((uint64_t*)fixupLoc) = target.absolute.value;
+ else
+ *((uint32_t*)fixupLoc) = (uint32_t)(target.absolute.value);
+ // don't record absolute targets for ASLR
+ break;
+ default:
+ assert(0 && "unsupported ResolvedSymbolTarget kind in dyld cache");
+ }
+ }
+ });
+ }
};
- auto it = supportedSections.find(sectionName);
- assert(it != supportedSections.end());
- return *it->second;
-}
-
-uint64_t CacheBuilder::CacheCoalescedText::getSectionVMAddr(std::string_view segmentName,
- std::string_view sectionName) const {
- if (segmentName.size() > 16)
- segmentName = segmentName.substr(0, 16);
- if (sectionName.size() > 16)
- sectionName = sectionName.substr(0, 16);
-
- if ( segmentName == "__TEXT" ) {
- return getSectionData(sectionName).bufferVMAddr;
- }
-
- if ( segmentName == "__OBJC_CONST" ) {
- if ( sectionName == "__cfstring" ) {
- return cfStrings.bufferVMAddr;
- }
- }
-
- assert(false);
-}
-
-uint8_t* CacheBuilder::CacheCoalescedText::getSectionBufferAddr(std::string_view segmentName,
- std::string_view sectionName) const {
- if (segmentName.size() > 16)
- segmentName = segmentName.substr(0, 16);
- if (sectionName.size() > 16)
- sectionName = sectionName.substr(0, 16);
-
- if ( segmentName == "__TEXT" ) {
- return getSectionData(sectionName).bufferAddr;
- }
-
- if ( segmentName == "__OBJC_CONST" ) {
- if ( sectionName == "__cfstring" ) {
- return cfStrings.bufferAddr;
- }
- }
-
- assert(false);
-}
-
-uint64_t CacheBuilder::CacheCoalescedText::getSectionObjcTag(std::string_view segmentName,
- std::string_view sectionName) const {
- if (segmentName.size() > 16)
- segmentName = segmentName.substr(0, 16);
- if (sectionName.size() > 16)
- sectionName = sectionName.substr(0, 16);
-
- if ( segmentName == "__TEXT" ) {
- // Nothing has a tag in __TEXT
- return 0;
- }
-
- if ( segmentName == "__OBJC_CONST" ) {
- if ( sectionName == "__cfstring" ) {
- // This is defined by objc as the tag we put in the high bits
- // FIXME: Get a tag from objc
- // return 1ULL << 63;
- return 0;
- }
- }
-
- assert(false);
-}
+
+ handlers.rebase = ^(dyld3::closure::ImageNum imageNum, const dyld3::MachOLoaded* imageToFix, uint32_t runtimeOffset) {
+ // record location in aslr tracker so kernel can slide this on page-in
+ uint8_t* fixupLoc = (uint8_t*)imageToFix+runtimeOffset;
+ _aslrTracker.add(fixupLoc);
+ };
+
+ handlers.bind = ^(dyld3::closure::ImageNum imageNum, const dyld3::MachOLoaded* mh,
+ uint32_t runtimeOffset, dyld3::closure::Image::ResolvedSymbolTarget target,
+ const dyld3::closure::ClosureBuilder::ResolvedTargetInfo& targetInfo) {
+ uint8_t* fixupLoc = (uint8_t*)mh+runtimeOffset;
+
+ // binder is called a second time for weak_bind info, which we ignore when building cache
+ const bool weakDefUseAlreadySet = targetInfo.weakBindCoalese && _aslrTracker.has(fixupLoc);
+
+ // do actual bind that sets pointer in image to unslid target address
+ uint64_t offsetInCache;
+ switch ( target.sharedCache.kind ) {
+ case dyld3::closure::Image::ResolvedSymbolTarget::kindSharedCache:
+ offsetInCache = target.sharedCache.offset - targetInfo.addend;
+ dylibToItsExports[targetInfo.foundInDylib].insert(offsetInCache);
+ exportsToUses[offsetInCache].push_back(PatchLocation(fixupLoc - _readExecuteRegion.buffer, targetInfo.addend));
+ exportsToName[offsetInCache] = targetInfo.foundSymbolName;
+ if ( !weakDefUseAlreadySet ) {
+ if ( _archLayout->is64 )
+ *((uint64_t*)fixupLoc) = _archLayout->sharedMemoryStart + target.sharedCache.offset;
+ else
+ *((uint32_t*)fixupLoc) = (uint32_t)(_archLayout->sharedMemoryStart + target.sharedCache.offset);
+ // record location in aslr tracker so kernel can slide this on page-in
+ _aslrTracker.add(fixupLoc);
+ }
+ break;
+ case dyld3::closure::Image::ResolvedSymbolTarget::kindAbsolute:
+ if ( _archLayout->is64 )
+ *((uint64_t*)fixupLoc) = target.absolute.value;
+ else
+ *((uint32_t*)fixupLoc) = (uint32_t)(target.absolute.value);
+ // don't record absolute targets for ASLR
+ // HACK: Split seg may have added a target. Remove it
+ _aslrTracker.remove(fixupLoc);
+ if ( (targetInfo.libOrdinal > 0) && (targetInfo.libOrdinal <= mh->dependentDylibCount()) ) {
+ _missingWeakImports[fixupLoc] = mh->dependentDylibLoadPath(targetInfo.libOrdinal - 1);
+ }
+ break;
+ default:
+ assert(0 && "unsupported ResolvedSymbolTarget kind in dyld cache");
+ }
+ };
+
+ handlers.forEachExportsPatch = ^(dyld3::closure::ImageNum imageNum, void (^handler)(const dyld3::closure::ClosureBuilder::CacheDylibsBindingHandlers::PatchInfo&)) {
+ const dyld3::MachOLoaded* ml = imageNumToML[imageNum];
+ for (CacheOffset exportCacheOffset : dylibToItsExports[ml]) {
+ dyld3::closure::ClosureBuilder::CacheDylibsBindingHandlers::PatchInfo info;
+ std::vector<PatchLocation>& uses = exportsToUses[exportCacheOffset];
+ uses.erase(std::unique(uses.begin(), uses.end()), uses.end());
+ info.exportCacheOffset = (uint32_t)exportCacheOffset;
+ info.exportSymbolName = exportsToName[exportCacheOffset];
+ info.usesCount = (uint32_t)uses.size();
+ info.usesArray = &uses.front();
+ handler(info);
+ }
+ };
+
+
+ // build ImageArray for all dylibs in dyld cache
+ dyld3::closure::PathOverrides pathOverrides;
+ dyld3::closure::ClosureBuilder cb(dyld3::closure::kFirstDyldCacheImageNum, _fileSystem, cache, false, pathOverrides, dyld3::closure::ClosureBuilder::AtPath::none, nullptr, _archLayout->archName, _options.platform, &handlers);
+ dyld3::Array<CachedDylibInfo> dylibs(&dylibInfos[0], dylibInfos.size(), dylibInfos.size());
+ const dyld3::Array<dyld3::closure::ClosureBuilder::CachedDylibAlias> aliasesArray(dylibAliases.data(), dylibAliases.size(), dylibAliases.size());
+ _imageArray = cb.makeDyldCacheImageArray(_options.optimizeStubs, dylibs, aliasesArray);
+ if ( cb.diagnostics().hasError() ) {
+ _diagnostics.error("%s", cb.diagnostics().errorMessage().c_str());
+ return;
+ }
+}
+
+void CacheBuilder::addImageArray()
+{
+ // build trie of dylib paths
+ __block std::vector<DylibIndexTrie::Entry> dylibEntrys;
+ _imageArray->forEachImage(^(const dyld3::closure::Image* image, bool& stop) {
+ dylibEntrys.push_back(DylibIndexTrie::Entry(image->path(), DylibIndex(image->imageNum()-1)));
+ image->forEachAlias(^(const char *aliasPath, bool &innerStop) {
+ dylibEntrys.push_back(DylibIndexTrie::Entry(aliasPath, DylibIndex(image->imageNum()-1)));
+ });
+ });
+ DylibIndexTrie dylibsTrie(dylibEntrys);
+ std::vector<uint8_t> trieBytes;
+ dylibsTrie.emit(trieBytes);
+ while ( (trieBytes.size() % 4) != 0 )
+ trieBytes.push_back(0);
+
+ // check for fit
+ uint64_t imageArraySize = _imageArray->size();
+ size_t freeSpace = _readOnlyRegion.bufferSize - _readOnlyRegion.sizeInUse;
+ if ( imageArraySize+trieBytes.size() > freeSpace ) {
+ _diagnostics.error("cache buffer too small to hold ImageArray and Trie (buffer size=%lldMB, imageArray size=%lldMB, trie size=%luKB, free space=%ldMB)",
+ _allocatedBufferSize/1024/1024, imageArraySize/1024/1024, trieBytes.size()/1024, freeSpace/1024/1024);
+ return;
+ }
+
+ // copy into cache and update header
+ DyldSharedCache* dyldCache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ dyldCache->header.dylibsImageArrayAddr = _readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse;
+ dyldCache->header.dylibsImageArraySize = imageArraySize;
+ dyldCache->header.dylibsTrieAddr = dyldCache->header.dylibsImageArrayAddr + imageArraySize;
+ dyldCache->header.dylibsTrieSize = trieBytes.size();
+ ::memcpy(_readOnlyRegion.buffer + _readOnlyRegion.sizeInUse, _imageArray, imageArraySize);
+ ::memcpy(_readOnlyRegion.buffer + _readOnlyRegion.sizeInUse + imageArraySize, &trieBytes[0], trieBytes.size());
+ _readOnlyRegion.sizeInUse += align(imageArraySize+trieBytes.size(),14);
+}
+
+void CacheBuilder::addOtherImageArray(const std::vector<LoadedMachO>& otherDylibsAndBundles, std::vector<const LoadedMachO*>& overflowDylibs)
+{
+ DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ dyld3::closure::PathOverrides pathOverrides;
+ dyld3::closure::ClosureBuilder cb(dyld3::closure::kFirstOtherOSImageNum, _fileSystem, cache, false, pathOverrides, dyld3::closure::ClosureBuilder::AtPath::none, nullptr, _archLayout->archName, _options.platform);
+
+ // make ImageArray for other dylibs and bundles
+ STACK_ALLOC_ARRAY(dyld3::closure::LoadedFileInfo, others, otherDylibsAndBundles.size() + overflowDylibs.size());
+ for (const LoadedMachO& other : otherDylibsAndBundles) {
+ if ( !contains(other.loadedFileInfo.path, ".app/") )
+ others.push_back(other.loadedFileInfo);
+ }
+
+ for (const LoadedMachO* dylib : overflowDylibs) {
+ if (dylib->mappedFile.mh->canHavePrecomputedDlopenClosure(dylib->mappedFile.runtimePath.c_str(), ^(const char*) {}) )
+ others.push_back(dylib->loadedFileInfo);
+ }
+
+ // Sort the others array by name so that it is deterministic
+ std::sort(others.begin(), others.end(),
+ [](const dyld3::closure::LoadedFileInfo& a, const dyld3::closure::LoadedFileInfo& b) {
+ return strcmp(a.path, b.path) < 0;
+ });
+
+ const dyld3::closure::ImageArray* otherImageArray = cb.makeOtherDylibsImageArray(others, (uint32_t)_sortedDylibs.size());
+
+ // build trie of paths
+ __block std::vector<DylibIndexTrie::Entry> otherEntrys;
+ otherImageArray->forEachImage(^(const dyld3::closure::Image* image, bool& stop) {
+ if ( !image->isInvalid() )
+ otherEntrys.push_back(DylibIndexTrie::Entry(image->path(), DylibIndex(image->imageNum())));
+ });
+ DylibIndexTrie dylibsTrie(otherEntrys);
+ std::vector<uint8_t> trieBytes;
+ dylibsTrie.emit(trieBytes);
+ while ( (trieBytes.size() % 4) != 0 )
+ trieBytes.push_back(0);
+
+ // check for fit
+ uint64_t imageArraySize = otherImageArray->size();
+ size_t freeSpace = _readOnlyRegion.bufferSize - _readOnlyRegion.sizeInUse;
+ if ( imageArraySize+trieBytes.size() > freeSpace ) {
+ _diagnostics.error("cache buffer too small to hold ImageArray and Trie (buffer size=%lldMB, imageArray size=%lldMB, trie size=%luKB, free space=%ldMB)",
+ _allocatedBufferSize/1024/1024, imageArraySize/1024/1024, trieBytes.size()/1024, freeSpace/1024/1024);
+ return;
+ }
+
+ // copy into cache and update header
+ DyldSharedCache* dyldCache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ dyldCache->header.otherImageArrayAddr = _readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse;
+ dyldCache->header.otherImageArraySize = imageArraySize;
+ dyldCache->header.otherTrieAddr = dyldCache->header.otherImageArrayAddr + imageArraySize;
+ dyldCache->header.otherTrieSize = trieBytes.size();
+ ::memcpy(_readOnlyRegion.buffer + _readOnlyRegion.sizeInUse, otherImageArray, imageArraySize);
+ ::memcpy(_readOnlyRegion.buffer + _readOnlyRegion.sizeInUse + imageArraySize, &trieBytes[0], trieBytes.size());
+ _readOnlyRegion.sizeInUse += align(imageArraySize+trieBytes.size(),14);
+}
+
+
+void CacheBuilder::addClosures(const std::vector<LoadedMachO>& osExecutables)
+{
+ const DyldSharedCache* dyldCache = (DyldSharedCache*)_readExecuteRegion.buffer;
+
+ __block std::vector<Diagnostics> osExecutablesDiags;
+ __block std::vector<const dyld3::closure::LaunchClosure*> osExecutablesClosures;
+ osExecutablesDiags.resize(osExecutables.size());
+ osExecutablesClosures.resize(osExecutables.size());
+
+ dispatch_apply(osExecutables.size(), DISPATCH_APPLY_AUTO, ^(size_t index) {
+ const LoadedMachO& loadedMachO = osExecutables[index];
+ // don't pre-build closures for staged apps into dyld cache, since they won't run from that location
+ if ( startsWith(loadedMachO.mappedFile.runtimePath, "/private/var/staged_system_apps/") ) {
+ return;
+ }
+ dyld3::closure::PathOverrides pathOverrides;
+ dyld3::closure::ClosureBuilder builder(dyld3::closure::kFirstLaunchClosureImageNum, _fileSystem, dyldCache, false, pathOverrides, dyld3::closure::ClosureBuilder::AtPath::all, nullptr, _archLayout->archName, _options.platform, nullptr);
+ bool issetuid = false;
+ if ( this->_options.platform == dyld3::Platform::macOS )
+ _fileSystem.fileExists(loadedMachO.loadedFileInfo.path, nullptr, nullptr, &issetuid);
+ const dyld3::closure::LaunchClosure* mainClosure = builder.makeLaunchClosure(loadedMachO.loadedFileInfo, issetuid);
+ if ( builder.diagnostics().hasError() ) {
+ osExecutablesDiags[index].error("%s", builder.diagnostics().errorMessage().c_str());
+ }
+ else {
+ assert(mainClosure != nullptr);
+ osExecutablesClosures[index] = mainClosure;
+ }
+ });
+
+ std::map<std::string, const dyld3::closure::LaunchClosure*> closures;
+ for (uint64_t i = 0, e = osExecutables.size(); i != e; ++i) {
+ const LoadedMachO& loadedMachO = osExecutables[i];
+ const Diagnostics& diag = osExecutablesDiags[i];
+ if (diag.hasError()) {
+ if ( _options.verbose ) {
+ _diagnostics.warning("building closure for '%s': %s", loadedMachO.mappedFile.runtimePath.c_str(), diag.errorMessage().c_str());
+ for (const std::string& warn : diag.warnings() )
+ _diagnostics.warning("%s", warn.c_str());
+ }
+ if ( loadedMachO.inputFile && (loadedMachO.inputFile->mustBeIncluded()) ) {
+ loadedMachO.inputFile->diag.error("%s", diag.errorMessage().c_str());
+ }
+ } else {
+ // Note, a closure could be null here if it has a path we skip.
+ if (osExecutablesClosures[i] != nullptr)
+ closures[loadedMachO.mappedFile.runtimePath] = osExecutablesClosures[i];
+ }
+ }
+
+ osExecutablesDiags.clear();
+ osExecutablesClosures.clear();
+
+ // preflight space needed
+ size_t closuresSpace = 0;
+ for (const auto& entry : closures) {
+ closuresSpace += entry.second->size();
+ }
+ size_t freeSpace = _readOnlyRegion.bufferSize - _readOnlyRegion.sizeInUse;
+ if ( closuresSpace > freeSpace ) {
+ _diagnostics.error("cache buffer too small to hold all closures (buffer size=%lldMB, closures size=%ldMB, free space=%ldMB)",
+ _allocatedBufferSize/1024/1024, closuresSpace/1024/1024, freeSpace/1024/1024);
+ return;
+ }
+ DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ cache->header.progClosuresAddr = _readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse;
+ uint8_t* closuresBase = _readOnlyRegion.buffer + _readOnlyRegion.sizeInUse;
+ std::vector<DylibIndexTrie::Entry> closureEntrys;
+ uint32_t currentClosureOffset = 0;
+ for (const auto& entry : closures) {
+ const dyld3::closure::LaunchClosure* closure = entry.second;
+ closureEntrys.push_back(DylibIndexTrie::Entry(entry.first, DylibIndex(currentClosureOffset)));
+ size_t size = closure->size();
+ assert((size % 4) == 0);
+ memcpy(closuresBase+currentClosureOffset, closure, size);
+ currentClosureOffset += size;
+ freeSpace -= size;
+ closure->deallocate();
+ }
+ cache->header.progClosuresSize = currentClosureOffset;
+ _readOnlyRegion.sizeInUse += currentClosureOffset;
+ freeSpace = _readOnlyRegion.bufferSize - _readOnlyRegion.sizeInUse;
+ // build trie of indexes into closures list
+ DylibIndexTrie closureTrie(closureEntrys);
+ std::vector<uint8_t> trieBytes;
+ closureTrie.emit(trieBytes);
+ while ( (trieBytes.size() % 8) != 0 )
+ trieBytes.push_back(0);
+ if ( trieBytes.size() > freeSpace ) {
+ _diagnostics.error("cache buffer too small to hold all closures trie (buffer size=%lldMB, trie size=%ldMB, free space=%ldMB)",
+ _allocatedBufferSize/1024/1024, trieBytes.size()/1024/1024, freeSpace/1024/1024);
+ return;
+ }
+ memcpy(_readOnlyRegion.buffer + _readOnlyRegion.sizeInUse, &trieBytes[0], trieBytes.size());
+ cache->header.progClosuresTrieAddr = _readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse;
+ cache->header.progClosuresTrieSize = trieBytes.size();
+ _readOnlyRegion.sizeInUse += trieBytes.size();
+ _readOnlyRegion.sizeInUse = align(_readOnlyRegion.sizeInUse, 14);
+}
+
+
+bool CacheBuilder::writeCache(void (^cacheSizeCallback)(uint64_t size), bool (^copyCallback)(const uint8_t* src, uint64_t size, uint64_t dstOffset))
+{
+ const dyld_cache_header* cacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer;
+ const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(_readExecuteRegion.buffer + cacheHeader->mappingOffset);
+ assert(_readExecuteRegion.sizeInUse == mappings[0].size);
+ assert(_readWriteRegion.sizeInUse == mappings[1].size);
+ assert(_readOnlyRegion.sizeInUse == mappings[2].size);
+ assert(_readExecuteRegion.cacheFileOffset == mappings[0].fileOffset);
+ assert(_readWriteRegion.cacheFileOffset == mappings[1].fileOffset);
+ assert(_readOnlyRegion.cacheFileOffset == mappings[2].fileOffset);
+ assert(_codeSignatureRegion.sizeInUse == cacheHeader->codeSignatureSize);
+ assert(cacheHeader->codeSignatureOffset == mappings[2].fileOffset+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse);
+ cacheSizeCallback(_readExecuteRegion.sizeInUse+_readWriteRegion.sizeInUse+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse+_codeSignatureRegion.sizeInUse);
+ bool fullyWritten = copyCallback(_readExecuteRegion.buffer, _readExecuteRegion.sizeInUse, mappings[0].fileOffset);
+ fullyWritten &= copyCallback(_readWriteRegion.buffer, _readWriteRegion.sizeInUse, mappings[1].fileOffset);
+ fullyWritten &= copyCallback(_readOnlyRegion.buffer, _readOnlyRegion.sizeInUse, mappings[2].fileOffset);
+ if ( _localSymbolsRegion.sizeInUse != 0 ) {
+ assert(cacheHeader->localSymbolsOffset == mappings[2].fileOffset+_readOnlyRegion.sizeInUse);
+ fullyWritten &= copyCallback(_localSymbolsRegion.buffer, _localSymbolsRegion.sizeInUse, cacheHeader->localSymbolsOffset);
+ }
+ fullyWritten &= copyCallback(_codeSignatureRegion.buffer, _codeSignatureRegion.sizeInUse, cacheHeader->codeSignatureOffset);
+ return fullyWritten;
+}
+
+
+void CacheBuilder::writeFile(const std::string& path)
+{
+ std::string pathTemplate = path + "-XXXXXX";
+ size_t templateLen = strlen(pathTemplate.c_str())+2;
+ char pathTemplateSpace[templateLen];
+ strlcpy(pathTemplateSpace, pathTemplate.c_str(), templateLen);
+ int fd = mkstemp(pathTemplateSpace);
+ if ( fd != -1 ) {
+ auto cacheSizeCallback = ^(uint64_t size) {
+ ::ftruncate(fd, size);
+ };
+ auto copyCallback = ^(const uint8_t* src, uint64_t size, uint64_t dstOffset) {
+ uint64_t writtenSize = pwrite(fd, src, size, dstOffset);
+ return writtenSize == size;
+ };
+ bool fullyWritten = writeCache(cacheSizeCallback, copyCallback);
+ if ( fullyWritten ) {
+ ::fchmod(fd, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); // mkstemp() makes file "rw-------", switch it to "rw-r--r--"
+ if ( ::rename(pathTemplateSpace, path.c_str()) == 0) {
+ ::close(fd);
+ return; // success
+ }
+ }
+ else {
+ _diagnostics.error("could not write file %s", pathTemplateSpace);
+ }
+ ::close(fd);
+ ::unlink(pathTemplateSpace);
+ }
+ else {
+ _diagnostics.error("could not open file %s", pathTemplateSpace);
+ }
+}
+
+void CacheBuilder::writeBuffer(uint8_t*& buffer, uint64_t& bufferSize) {
+ auto cacheSizeCallback = ^(uint64_t size) {
+ buffer = (uint8_t*)malloc(size);
+ bufferSize = size;
+ };
+ auto copyCallback = ^(const uint8_t* src, uint64_t size, uint64_t dstOffset) {
+ memcpy(buffer + dstOffset, src, size);
+ return true;
+ };
+ bool fullyWritten = writeCache(cacheSizeCallback, copyCallback);
+ assert(fullyWritten);
+}
+
+void CacheBuilder::writeMapFile(const std::string& path)
+{
+ const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ std::string mapContent = cache->mapFile();
+ safeSave(mapContent.c_str(), mapContent.size(), path);
+}
+
+void CacheBuilder::writeMapFileBuffer(uint8_t*& buffer, uint64_t& bufferSize)
+{
+ const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
+ std::string mapContent = cache->mapFile();
+ buffer = (uint8_t*)malloc(mapContent.size() + 1);
+ bufferSize = mapContent.size() + 1;
+ memcpy(buffer, mapContent.data(), bufferSize);
+}
+
+
+void CacheBuilder::forEachCacheDylib(void (^callback)(const std::string& path)) {
+ for (const DylibInfo& dylibInfo : _sortedDylibs)
+ callback(dylibInfo.runtimePath);
+}
+
+
+CacheBuilder::ASLR_Tracker::~ASLR_Tracker()
+{
+ if ( _bitmap != nullptr )
+ ::free(_bitmap);
+}
+
+void CacheBuilder::ASLR_Tracker::setDataRegion(const void* rwRegionStart, size_t rwRegionSize)
+{
+ _pageCount = (unsigned)(rwRegionSize+_pageSize-1)/_pageSize;
+ _regionStart = (uint8_t*)rwRegionStart;
+ _endStart = (uint8_t*)rwRegionStart + rwRegionSize;
+ _bitmap = (bool*)calloc(_pageCount*(_pageSize/4)*sizeof(bool), 1);
+}
+
+void CacheBuilder::ASLR_Tracker::add(void* loc)
+{
+ uint8_t* p = (uint8_t*)loc;
+ assert(p >= _regionStart);
+ assert(p < _endStart);
+ _bitmap[(p-_regionStart)/4] = true;
+}
+
+void CacheBuilder::ASLR_Tracker::remove(void* loc)
+{
+ uint8_t* p = (uint8_t*)loc;
+ assert(p >= _regionStart);
+ assert(p < _endStart);
+ _bitmap[(p-_regionStart)/4] = false;
+}
+
+bool CacheBuilder::ASLR_Tracker::has(void* loc)
+{
+ uint8_t* p = (uint8_t*)loc;
+ assert(p >= _regionStart);
+ assert(p < _endStart);
+ return _bitmap[(p-_regionStart)/4];
+}
+
+
+
+