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4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 | /* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- * * Copyright (c) 2014 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #include <unistd.h> #include <dirent.h> #include <sys/errno.h> #include <sys/fcntl.h> #include <sys/param.h> #include <sys/types.h> #include <sys/stat.h> #include <mach/mach.h> #include <mach/mach_vm.h> #include <mach/mach_time.h> #include <mach/shared_region.h> #include <apfs/apfs_fsctl.h> #include <iostream> #include <CommonCrypto/CommonHMAC.h> #include <CommonCrypto/CommonDigest.h> #include <CommonCrypto/CommonDigestSPI.h> #include "mach-o/dyld_priv.h" #include "ClosureBuilder.h" #include "Closure.h" #include "ClosureFileSystemNull.h" #include "CodeSigningTypes.h" #include "MachOFileAbstraction.hpp" #include "SharedCacheBuilder.h" #include "RootsChecker.h" #include "IMPCachesBuilder.hpp" #include "FileUtils.h" #include "StringUtils.h" #include "Trie.hpp" #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 0x100000000ULL #endif #if ARM64_SHARED_REGION_START == 0x7FFF00000000 #define ARM64_DELTA_MASK 0x00FF000000000000 #else #define ARM64_DELTA_MASK 0x00FFFF0000000000 #endif #ifndef ARM64_32_SHARED_REGION_START #define ARM64_32_SHARED_REGION_START 0x1A000000ULL #define ARM64_32_SHARED_REGION_SIZE 0x26000000ULL #endif #define ARMV7K_CHAIN_BITS 0xC0000000 #if BUILDING_UPDATE_DYLD_CACHE_BUILDER #define DISCONTIGUOUS_RX 0x7FFF20000000ULL #else #define DISCONTIGUOUS_RX 0x7FFF20000000ULL // size for MRM builder #endif #define DISCONTIGUOUS_RW 0x7FFF80000000ULL #define DISCONTIGUOUS_RO 0x7FFFC0000000ULL #define DISCONTIGUOUS_RX_SIZE (DISCONTIGUOUS_RW - DISCONTIGUOUS_RX) #define DISCONTIGUOUS_RW_SIZE 0x40000000 #define DISCONTIGUOUS_RO_SIZE 0x3FE00000 const SharedCacheBuilder::ArchLayout SharedCacheBuilder::_s_archLayout[] = { { DISCONTIGUOUS_RX, 0xEFE00000ULL, 0x40000000, 0x00FFFF0000000000, "x86_64", CS_PAGE_SIZE_4K, 14, 2, true, true, true }, { DISCONTIGUOUS_RX, 0xEFE00000ULL, 0x40000000, 0x00FFFF0000000000, "x86_64h", CS_PAGE_SIZE_4K, 14, 2, true, true, true }, { SHARED_REGION_BASE_I386, SHARED_REGION_SIZE_I386, 0x00200000, 0x0, "i386", CS_PAGE_SIZE_4K, 12, 0, false, false, true }, { ARM64_SHARED_REGION_START, ARM64_SHARED_REGION_SIZE, 0x02000000, ARM64_DELTA_MASK, "arm64", CS_PAGE_SIZE_4K, 14, 2, false, true, false }, #if SUPPORT_ARCH_arm64e { ARM64_SHARED_REGION_START, ARM64_SHARED_REGION_SIZE, 0x02000000, ARM64_DELTA_MASK, "arm64e", CS_PAGE_SIZE_16K, 14, 2, false, true, false }, #endif #if SUPPORT_ARCH_arm64_32 { ARM64_32_SHARED_REGION_START, ARM64_32_SHARED_REGION_SIZE, 0x02000000, 0xC0000000, "arm64_32", CS_PAGE_SIZE_16K, 14, 6, false, false, true }, #endif { ARM_SHARED_REGION_START, ARM_SHARED_REGION_SIZE, 0x02000000, 0xE0000000, "armv7s", CS_PAGE_SIZE_4K, 14, 4, false, false, true }, { ARM_SHARED_REGION_START, ARM_SHARED_REGION_SIZE, 0x00400000, ARMV7K_CHAIN_BITS, "armv7k", CS_PAGE_SIZE_4K, 14, 4, false, false, true }, { 0x40000000, 0x40000000, 0x02000000, 0x0, "sim-x86", CS_PAGE_SIZE_4K, 14, 0, false, false, true } }; // These are functions that are interposed by Instruments.app or ASan const char* const SharedCacheBuilder::_s_neverStubEliminateSymbols[] = { "___bzero", "___cxa_atexit", "___cxa_throw", "__longjmp", "__objc_autoreleasePoolPop", "_accept", "_access", "_asctime", "_asctime_r", "_asprintf", "_atoi", "_atol", "_atoll", "_calloc", "_chmod", "_chown", "_close", "_confstr", "_ctime", "_ctime_r", "_dispatch_after", "_dispatch_after_f", "_dispatch_async", "_dispatch_async_f", "_dispatch_barrier_async_f", "_dispatch_group_async", "_dispatch_group_async_f", "_dispatch_source_set_cancel_handler", "_dispatch_source_set_event_handler", "_dispatch_sync_f", "_dlclose", "_dlopen", "_dup", "_dup2", "_endgrent", "_endpwent", "_ether_aton", "_ether_hostton", "_ether_line", "_ether_ntoa", "_ether_ntohost", "_fchmod", "_fchown", "_fclose", "_fdopen", "_fflush", "_fopen", "_fork", "_fprintf", "_free", "_freopen", "_frexp", "_frexpf", "_frexpl", "_fscanf", "_fstat", "_fstatfs", "_fstatfs64", "_fsync", "_ftime", "_getaddrinfo", "_getattrlist", "_getcwd", "_getgrent", "_getgrgid", "_getgrgid_r", "_getgrnam", "_getgrnam_r", "_getgroups", "_gethostbyaddr", "_gethostbyname", "_gethostbyname2", "_gethostent", "_getifaddrs", "_getitimer", "_getnameinfo", "_getpass", "_getpeername", "_getpwent", "_getpwnam", "_getpwnam_r", "_getpwuid", "_getpwuid_r", "_getsockname", "_getsockopt", "_gmtime", "_gmtime_r", "_if_indextoname", "_if_nametoindex", "_index", "_inet_aton", "_inet_ntop", "_inet_pton", "_initgroups", "_ioctl", "_lchown", "_lgamma", "_lgammaf", "_lgammal", "_link", "_listxattr", "_localtime", "_localtime_r", "_longjmp", "_lseek", "_lstat", "_malloc", "_malloc_create_zone", "_malloc_default_purgeable_zone", "_malloc_default_zone", "_malloc_destroy_zone", "_malloc_good_size", "_malloc_make_nonpurgeable", "_malloc_make_purgeable", "_malloc_set_zone_name", "_malloc_zone_from_ptr", "_mbsnrtowcs", "_mbsrtowcs", "_mbstowcs", "_memchr", "_memcmp", "_memcpy", "_memmove", "_memset", "_mktime", "_mlock", "_mlockall", "_modf", "_modff", "_modfl", "_munlock", "_munlockall", "_objc_autoreleasePoolPop", "_objc_setProperty", "_objc_setProperty_atomic", "_objc_setProperty_atomic_copy", "_objc_setProperty_nonatomic", "_objc_setProperty_nonatomic_copy", "_objc_storeStrong", "_open", "_opendir", "_poll", "_posix_memalign", "_pread", "_printf", "_pthread_attr_getdetachstate", "_pthread_attr_getguardsize", "_pthread_attr_getinheritsched", "_pthread_attr_getschedparam", "_pthread_attr_getschedpolicy", "_pthread_attr_getscope", "_pthread_attr_getstack", "_pthread_attr_getstacksize", "_pthread_condattr_getpshared", "_pthread_create", "_pthread_getschedparam", "_pthread_join", "_pthread_mutex_lock", "_pthread_mutex_unlock", "_pthread_mutexattr_getprioceiling", "_pthread_mutexattr_getprotocol", "_pthread_mutexattr_getpshared", "_pthread_mutexattr_gettype", "_pthread_rwlockattr_getpshared", "_pwrite", "_rand_r", "_read", "_readdir", "_readdir_r", "_readv", "_readv$UNIX2003", "_realloc", "_realpath", "_recv", "_recvfrom", "_recvmsg", "_remquo", "_remquof", "_remquol", "_scanf", "_send", "_sendmsg", "_sendto", "_setattrlist", "_setgrent", "_setitimer", "_setlocale", "_setpwent", "_shm_open", "_shm_unlink", "_sigaction", "_sigemptyset", "_sigfillset", "_siglongjmp", "_signal", "_sigpending", "_sigprocmask", "_sigwait", "_snprintf", "_sprintf", "_sscanf", "_stat", "_statfs", "_statfs64", "_strcasecmp", "_strcat", "_strchr", "_strcmp", "_strcpy", "_strdup", "_strerror", "_strerror_r", "_strlen", "_strncasecmp", "_strncat", "_strncmp", "_strncpy", "_strptime", "_strtoimax", "_strtol", "_strtoll", "_strtoumax", "_tempnam", "_time", "_times", "_tmpnam", "_tsearch", "_unlink", "_valloc", "_vasprintf", "_vfprintf", "_vfscanf", "_vprintf", "_vscanf", "_vsnprintf", "_vsprintf", "_vsscanf", "_wait", "_wait$UNIX2003", "_wait3", "_wait4", "_waitid", "_waitid$UNIX2003", "_waitpid", "_waitpid$UNIX2003", "_wcslen", "_wcsnrtombs", "_wcsrtombs", "_wcstombs", "_wordexp", "_write", "_writev", "_writev$UNIX2003", // <rdar://problem/22050956> always use stubs for C++ symbols that can be overridden "__ZdaPv", "__ZdlPv", "__Znam", "__Znwm", nullptr }; inline uint32_t absolutetime_to_milliseconds(uint64_t abstime) { return (uint32_t)(abstime/1000/1000); } // Handles building a list of input files to the SharedCacheBuilder itself. class CacheInputBuilder { public: CacheInputBuilder(const dyld3::closure::FileSystem& fileSystem, const dyld3::GradedArchs& archs, dyld3::Platform reqPlatform) : fileSystem(fileSystem), reqArchs(archs), 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) { char realerPath[MAXPATHLEN]; dyld3::closure::LoadedFileInfo loadedFileInfo = dyld3::MachOAnalyzer::load(inputFile.diag, fileSystem, inputFile.path, reqArchs, reqPlatform, realerPath); if ( (reqPlatform == dyld3::Platform::macOS) && inputFile.diag.hasError() ) { // Try again with iOSMac inputFile.diag.clearError(); loadedFileInfo = dyld3::MachOAnalyzer::load(inputFile.diag, fileSystem, inputFile.path, reqArchs, dyld3::Platform::iOSMac, realerPath); } 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(); const char* dylibPath = inputFile.path; if ( (installName != inputFile.path) && (reqPlatform == dyld3::Platform::macOS) ) { // We now typically require that install names and paths match. However symlinks may allow us to bring in a path which // doesn't match its install name. // For example: // /usr/lib/libstdc++.6.0.9.dylib is a real file with install name /usr/lib/libstdc++.6.dylib // /usr/lib/libstdc++.6.dylib is a symlink to /usr/lib/libstdc++.6.0.9.dylib // So long as we add both paths (with one as an alias) then this will work, even if dylibs are removed from disk // but the symlink remains. char resolvedSymlinkPath[PATH_MAX]; if ( fileSystem.getRealPath(installName.c_str(), resolvedSymlinkPath) ) { if (!strcmp(resolvedSymlinkPath, inputFile.path)) { // Symlink is the install name and points to the on-disk dylib //fprintf(stderr, "Symlink works: %s == %s\n", inputFile.path, installName.c_str()); dylibPath = installName.c_str(); } } } if (!ma->canBePlacedInDyldCache(dylibPath, ^(const char* msg) { inputFile.diag.warning("Dylib located at '%s' cannot be placed in cache because: %s", inputFile.path, msg); })) { if (!ma->canHavePrecomputedDlopenClosure(inputFile.path, ^(const char* msg) { inputFile.diag.verbose("Dylib located at '%s' cannot prebuild dlopen closure in cache because: %s", inputFile.path, msg); }) ) { fileSystem.unloadFile(loadedFileInfo); continue; } 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()) { if (!ma->canHavePrecomputedDlopenClosure(inputFile.path, ^(const char* msg) { inputFile.diag.verbose("Dylib located at '%s' cannot prebuild dlopen closure in cache because: %s", inputFile.path, msg); }) ) { fileSystem.unloadFile(loadedFileInfo); continue; } otherDylibs.emplace_back((CacheBuilder::LoadedMachO){ mappedFile, loadedFileInfo, &inputFile }); } else if (ma->isDynamicExecutable()) { // Let the platform exclude the file before we do anything else. if (platformExcludesExecutablePath(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 platformExcludesExecutablePath_macOS(const std::string& path) { // We no longer support ROSP, so skip all paths which start with the special prefix if ( startsWith(path, "/System/Library/Templates/Data/") ) return true; static const char* sAllowedPrefixes[] = { "/bin/", "/sbin/", "/usr/", "/System/", "/Library/Apple/System/", "/Library/Apple/usr/", "/System/Applications/Safari.app/", "/Library/CoreMediaIO/Plug-Ins/DAL/" // temp until plugins moved or closured working }; bool inSearchDir = false; for (const char* searchDir : sAllowedPrefixes ) { if ( strncmp(searchDir, path.c_str(), strlen(searchDir)) == 0 ) { inSearchDir = true; break; } } return !inSearchDir; } // 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 false; case dyld3::Platform::tvOS: return false; case dyld3::Platform::watchOS: return false; case dyld3::Platform::bridgeOS: return false; case dyld3::Platform::iOSMac: return platformExcludesExecutablePath_macOS(path); case dyld3::Platform::iOS_simulator: return false; case dyld3::Platform::tvOS_simulator: return false; case dyld3::Platform::watchOS_simulator: return false; case dyld3::Platform::driverKit: return false; } } const dyld3::closure::FileSystem& fileSystem; const dyld3::GradedArchs& reqArchs; dyld3::Platform reqPlatform; }; SharedCacheBuilder::SharedCacheBuilder(const DyldSharedCache::CreateOptions& options, const dyld3::closure::FileSystem& fileSystem) : CacheBuilder(options, fileSystem) { std::string targetArch = options.archs->name(); if ( options.forSimulator && (options.archs == &dyld3::GradedArchs::i386) ) targetArch = "sim-x86"; for (const ArchLayout& layout : _s_archLayout) { if ( layout.archName == targetArch ) { _archLayout = &layout; _is64 = _archLayout->is64; break; } } if (!_archLayout) { _diagnostics.error("Tool was built without support for: '%s'", targetArch.c_str()); } } static void verifySelfContained(const dyld3::closure::FileSystem& fileSystem, 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 }); } // Exclude bad unzippered twins. These are where a zippered binary links // an unzippered twin std::unordered_map<std::string, std::string> macOSPathToTwinPath; for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) { macOSPathToTwinPath[dylib.mappedFile.runtimePath] = ""; } for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) { if ( startsWith(dylib.mappedFile.runtimePath, "/System/iOSSupport/") ) { std::string tail = dylib.mappedFile.runtimePath.substr(18); if ( macOSPathToTwinPath.find(tail) != macOSPathToTwinPath.end() ) macOSPathToTwinPath[tail] = dylib.mappedFile.runtimePath; } } __block std::map<std::string, std::set<std::string>> badDylibs; for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) { if ( badDylibs.count(dylib.mappedFile.runtimePath) != 0 ) continue; if ( dylib.mappedFile.mh->isZippered() ) { dylib.mappedFile.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) { auto macOSAndTwinPath = macOSPathToTwinPath.find(loadPath); if ( macOSAndTwinPath != macOSPathToTwinPath.end() ) { const std::string& twinPath = macOSAndTwinPath->second; if ( badDylibs.count(twinPath) != 0 ) return; knownDylibs.erase(twinPath); badDylibs[twinPath].insert(std::string("evicting UIKitForMac binary as it is linked by zippered binary '") + dylib.mappedFile.runtimePath + "'"); } }); } } // HACK: Exclude some dylibs and transitive deps for now until we have project fixes __block std::set<std::string> badProjects; badProjects.insert("/System/Library/PrivateFrameworks/TuriCore.framework/Versions/A/TuriCore"); badProjects.insert("/System/Library/PrivateFrameworks/UHASHelloExtensionPoint-macOS.framework/Versions/A/UHASHelloExtensionPoint-macOS"); // check all dependencies to assure every dylib in cache only depends on other dylibs in cache __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; if ( badProjects.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 ( badProjects.count(loadPath) != 0 ) { // We depend on a bad dylib, so add this one to the list too badProjects.insert(dylib.mappedFile.runtimePath); badProjects.insert(dylib.mappedFile.mh->installName()); knownDylibs.erase(dylib.mappedFile.runtimePath); knownDylibs.erase(dylib.mappedFile.mh->installName()); badDylibs[dylib.mappedFile.runtimePath].insert(std::string("Depends on bad project '") + loadPath + "'"); doAgain = true; return; } char resolvedSymlinkPath[PATH_MAX]; if ( knownDylibs.count(loadPath) == 0 ) { // The loadPath was embedded when the dylib was built, but we may be in the process of moving // a dylib with symlinks from old to new paths // In this case, the realpath will tell us the new location if ( fileSystem.getRealPath(loadPath, resolvedSymlinkPath) ) { if ( strcmp(resolvedSymlinkPath, loadPath) != 0 ) { loadPath = resolvedSymlinkPath; } } } 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 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 SharedCacheBuilder::build(std::vector<CacheBuilder::InputFile>& inputFiles, std::vector<DyldSharedCache::FileAlias>& aliases) { // First filter down to files which are actually MachO's CacheInputBuilder cacheInputBuilder(_fileSystem, *_options.archs, _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(_fileSystem, 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 SharedCacheBuilder::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 SharedCacheBuilder::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; } _timeRecorder.pushTimedSection(); // 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; } _timeRecorder.recordTime("sort dylibs"); bool impCachesSuccess = false; IMPCaches::HoleMap selectorAddressIntervals; _impCachesBuilder = new IMPCaches::IMPCachesBuilder(_sortedDylibs, _options.objcOptimizations, _diagnostics, _timeRecorder, _fileSystem); // Note, macOS allows install names and paths to mismatch. This is currently not supported by // IMP caches as we use install names to look up the set of dylibs. if ( _archLayout->is64 && (_options.platform != dyld3::Platform::macOS) && ((_impCachesBuilder->neededClasses.size() > 0) || (_impCachesBuilder->neededMetaclasses.size() > 0))) { // Build the class map across all dylibs (including cross-image superclass references) _impCachesBuilder->buildClassesMap(_diagnostics); // Determine which methods will end up in each class's IMP cache impCachesSuccess = _impCachesBuilder->parseDylibs(_diagnostics); // Compute perfect hash functions for IMP caches if (impCachesSuccess) _impCachesBuilder->buildPerfectHashes(selectorAddressIntervals, _diagnostics); } constexpr bool log = false; if (log) { for (const auto& p : _impCachesBuilder->selectors.map) { printf("0x%06x %s\n", p.second->offset, p.second->name); } } _timeRecorder.recordTime("compute IMP caches"); IMPCaches::SelectorMap emptyMap; IMPCaches::SelectorMap& selectorMap = impCachesSuccess ? _impCachesBuilder->selectors : emptyMap; // assign addresses for each segment of each dylib in new cache parseCoalescableSegments(selectorMap, selectorAddressIntervals); processSelectorStrings(osExecutables, selectorAddressIntervals); assignSegmentAddresses(); std::vector<const LoadedMachO*> overflowDylibs; while ( cacheOverflowAmount() != 0 ) { // IMP caches: we may need to recompute the selector addresses here to be slightly more compact // if we remove dylibs? This is probably overkill. 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(); _dataRegions.clear(); _coalescedText.clear(); // Re-generate the hole map to remove any cruft that was added when parsing the coalescable text the first time. // Always clear the hole map, even if IMP caches are off, as it is used by the text coalescer selectorAddressIntervals.clear(); if (impCachesSuccess) _impCachesBuilder->computeLowBits(selectorAddressIntervals); parseCoalescableSegments(selectorMap, selectorAddressIntervals); processSelectorStrings(osExecutables, selectorAddressIntervals); assignSegmentAddresses(); _diagnostics.verbose("cache overflow, evicted %lu leaf dylibs\n", evictionCount); } markPaddingInaccessible(); // copy all segments into cache unsigned long wastedSelectorsSpace = selectorAddressIntervals.totalHoleSize(); if (wastedSelectorsSpace > 0) { _diagnostics.verbose("Selector placement for IMP caches wasted %lu bytes\n", wastedSelectorsSpace); if (log) { std::cerr << selectorAddressIntervals << std::endl; } } _timeRecorder.recordTime("layout cache"); writeCacheHeader(); copyRawSegments(); _timeRecorder.recordTime("copy cached dylibs into buffer"); // rebase all dylibs for new location in cache _aslrTracker.setDataRegion(firstDataRegion()->buffer, dataRegionsTotalSize()); if ( !_options.cacheSupportsASLR ) _aslrTracker.disable(); adjustAllImagesForNewSegmentLocations(_archLayout->sharedMemoryStart, _aslrTracker, &_lohTracker, &_coalescedText); if ( _diagnostics.hasError() ) return; _timeRecorder.recordTime("adjust segments for new split locations"); // build ImageArray for dyld3, which has side effect of binding all cached dylibs buildImageArray(aliases); if ( _diagnostics.hasError() ) return; _timeRecorder.recordTime("bind all images"); // optimize ObjC DyldSharedCache* dyldCache = (DyldSharedCache*)_readExecuteRegion.buffer; optimizeObjC(impCachesSuccess, _impCachesBuilder->inlinedSelectors); delete _impCachesBuilder; _impCachesBuilder = nullptr; if ( _diagnostics.hasError() ) return; _timeRecorder.recordTime("optimize Objective-C"); if ( _options.optimizeStubs ) { __block std::vector<std::pair<const mach_header*, const char*>> images; dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { images.push_back({ mh, installName }); }); int64_t cacheSlide = (long)dyldCache - dyldCache->unslidLoadAddress(); uint64_t cacheUnslideAddr = dyldCache->unslidLoadAddress(); optimizeAwayStubs(images, cacheSlide, cacheUnslideAddr, dyldCache, _s_neverStubEliminateSymbols); } // FIPS seal corecrypto, This must be done after stub elimination (so that __TEXT,__text is not changed after sealing) fipsSign(); _timeRecorder.recordTime("do stub elimination"); // merge and compact LINKEDIT segments { // If we want to remove, not just unmap locals, then set the dylibs themselves to be stripped DylibStripMode dylibStripMode = DylibStripMode::stripNone; if ( _options.localSymbolMode == DyldSharedCache::LocalSymbolsMode::strip ) dylibStripMode = CacheBuilder::DylibStripMode::stripLocals; __block std::vector<std::tuple<const mach_header*, const char*, DylibStripMode>> images; dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { images.push_back({ mh, installName, dylibStripMode }); }); optimizeLinkedit(&_localSymbolsRegion, images); } // copy ImageArray to end of read-only region addImageArray(); if ( _diagnostics.hasError() ) return; _timeRecorder.recordTime("optimize LINKEDITs"); // don't add dyld3 closures to simulator cache or the base system where size is more of an issue if ( _options.optimizeDyldDlopens ) { // compute and add dlopen closures for all other dylibs addOtherImageArray(otherOsDylibsInput, overflowDylibs); if ( _diagnostics.hasError() ) return; } if ( _options.optimizeDyldLaunches ) { // compute and add launch closures to end of read-only region 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[dyldCache->header.mappingCount - 1].size = _readOnlyRegion.sizeInUse; dyld_cache_mapping_and_slide_info* slidableMappings = (dyld_cache_mapping_and_slide_info*)(_readExecuteRegion.buffer + dyldCache->header.mappingWithSlideOffset); slidableMappings[dyldCache->header.mappingCount - 1].size = _readOnlyRegion.sizeInUse; if ( _localSymbolsRegion.sizeInUse != 0 ) { dyldCache->header.localSymbolsOffset = _readOnlyRegion.cacheFileOffset + _readOnlyRegion.sizeInUse; dyldCache->header.localSymbolsSize = _localSymbolsRegion.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 = DISCONTIGUOUS_RX_SIZE - _readExecuteRegion.sizeInUse; // TEXT region has 1.5GB region uint64_t maxSlide1 = DISCONTIGUOUS_RW_SIZE - dataRegionsTotalSize(); uint64_t maxSlide2 = DISCONTIGUOUS_RO_SIZE - _readOnlyRegion.sizeInUse; dyldCache->header.maxSlide = std::min(std::min(maxSlide0, maxSlide1), maxSlide2); } else { // <rdar://problem/49852839> branch predictor on arm64 currently only looks at low 32-bits, so don't slide cache more than 2GB if ( (_archLayout->sharedMemorySize == 0x100000000) && (_readExecuteRegion.sizeInUse < 0x80000000) ) dyldCache->header.maxSlide = 0x80000000 - _readExecuteRegion.sizeInUse; else dyldCache->header.maxSlide = (_archLayout->sharedMemoryStart + _archLayout->sharedMemorySize) - (_readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse); } // mark if any input dylibs were built with chained fixups dyldCache->header.builtFromChainedFixups = _someDylibsUsedChainedFixups; _timeRecorder.recordTime("build %lu closures", osExecutables.size()); // Emit the CF strings without their ISAs being signed // This must be after addImageArray() as it depends on hasImageIndex(). // It also has to be before emitting slide info as it adds ASLR entries. emitContantObjects(); _timeRecorder.recordTime("emit constant objects"); // 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()); #if SUPPORT_ARCH_arm64_32 || SUPPORT_ARCH_armv7k else if ( _archLayout->pointerDeltaMask == 0xC0000000 ) writeSlideInfoV4<Pointer32<LittleEndian>>(_aslrTracker.bitmap(), _aslrTracker.dataPageCount()); #endif else writeSlideInfoV2<Pointer32<LittleEndian>>(_aslrTracker.bitmap(), _aslrTracker.dataPageCount()); } _timeRecorder.recordTime("compute slide info"); // 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; _timeRecorder.recordTime("compute UUID and codesign cache file"); if (_options.verbose) { _timeRecorder.logTimings(); } return; } const std::set<std::string> SharedCacheBuilder::warnings() { return _diagnostics.warnings(); } const std::set<const dyld3::MachOAnalyzer*> SharedCacheBuilder::evictions() { return _evictions; } void SharedCacheBuilder::deleteBuffer() { // Cache buffer if ( _allocatedBufferSize != 0 ) { vm_deallocate(mach_task_self(), _fullAllocatedBuffer, _allocatedBufferSize); _fullAllocatedBuffer = 0; _allocatedBufferSize = 0; } // Local symbols buffer if ( _localSymbolsRegion.bufferSize != 0 ) { vm_deallocate(mach_task_self(), (vm_address_t)_localSymbolsRegion.buffer, _localSymbolsRegion.bufferSize); _localSymbolsRegion.buffer = 0; _localSymbolsRegion.bufferSize = 0; } // Code signatures if ( _codeSignatureRegion.bufferSize != 0 ) { vm_deallocate(mach_task_self(), (vm_address_t)_codeSignatureRegion.buffer, _codeSignatureRegion.bufferSize); _codeSignatureRegion.buffer = 0; _codeSignatureRegion.bufferSize = 0; } } void SharedCacheBuilder::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; // Sort mac before iOSMac bool isIOSMacA = strncmp(a.input->mappedFile.runtimePath.c_str(), "/System/iOSSupport/", 19) == 0; bool isIOSMacB = strncmp(b.input->mappedFile.runtimePath.c_str(), "/System/iOSSupport/", 19) == 0; if (isIOSMacA != isIOSMacB) return !isIOSMacA; // Finally sort by path return a.input->mappedFile.runtimePath < b.input->mappedFile.runtimePath; }); } struct DylibAndSize { const CacheBuilder::LoadedMachO* input; const char* installName; uint64_t size; }; uint64_t SharedCacheBuilder::cacheOverflowAmount() { if ( _archLayout->sharedRegionsAreDiscontiguous ) { // for macOS x86_64 cache, need to check each region for overflow if ( _readExecuteRegion.sizeInUse > DISCONTIGUOUS_RX_SIZE ) return (_readExecuteRegion.sizeInUse - DISCONTIGUOUS_RX_SIZE); uint64_t dataSize = dataRegionsTotalSize(); if ( dataSize > DISCONTIGUOUS_RW_SIZE ) return (dataSize - DISCONTIGUOUS_RW_SIZE); if ( _readOnlyRegion.sizeInUse > DISCONTIGUOUS_RO_SIZE ) return (_readOnlyRegion.sizeInUse - DISCONTIGUOUS_RO_SIZE); } else { bool alreadyOptimized = (_readOnlyRegion.sizeInUse != _readOnlyRegion.bufferSize); uint64_t vmSize = _readOnlyRegion.unslidLoadAddress - _readExecuteRegion.unslidLoadAddress; if ( alreadyOptimized ) vmSize += _readOnlyRegion.sizeInUse; else if ( _options.localSymbolMode == DyldSharedCache::LocalSymbolsMode::unmap ) vmSize += (_readOnlyRegion.sizeInUse * 37/100); // assume locals removal and LINKEDIT optimzation reduces LINKEDITs %37 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 SharedCacheBuilder::evictLeafDylibs(uint64_t reductionTarget, std::vector<const LoadedMachO*>& overflowDylibs) { // build a reverse map of all dylib dependencies __block std::map<std::string, std::set<std::string>> references; std::map<std::string, std::set<std::string>>* referencesPtr = &references; for (const DylibInfo& dylib : _sortedDylibs) { // Esnure we have an entry (even if it is empty) if (references.count(dylib.input->mappedFile.mh->installName()) == 0) { references[dylib.input->mappedFile.mh->installName()] = std::set<std::string>(); }; dylib.input->mappedFile.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool &stop) { references[loadPath].insert(dylib.input->mappedFile.mh->installName()); }); } // Find the sizes of all the dylibs std::vector<DylibAndSize> dylibsToSort; std::vector<DylibAndSize> sortedDylibs; for (const DylibInfo& dylib : _sortedDylibs) { const char* installName = dylib.input->mappedFile.mh->installName(); __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; }); dylibsToSort.push_back({ dylib.input, installName, segsSize }); } // Build an ordered list of what to remove. At each step we do following // 1) Find all dylibs that nothing else depends on // 2a) If any of those dylibs are not in the order select the largest one of them // 2b) If all the leaf dylibs are in the order file select the last dylib that appears last in the order file // 3) Remove all entries to the removed file from the reverse dependency map // 4) Go back to one and repeat until there are no more evictable dylibs // This results in us always choosing the locally optimal selection, and then taking into account how that impacts // the dependency graph for subsequent selections bool candidateFound = true; while (candidateFound) { candidateFound = false; DylibAndSize candidate; uint64_t candidateOrder = 0; for(const auto& dylib : dylibsToSort) { const auto& i = referencesPtr->find(dylib.installName); assert(i != referencesPtr->end()); if (!i->second.empty()) { continue; } const auto& j = _options.dylibOrdering.find(dylib.input->mappedFile.runtimePath); uint64_t order = 0; if (j != _options.dylibOrdering.end()) { order = j->second; } else { // Not in the order file, set order sot it goes to the front of the list order = UINT64_MAX; } if (order > candidateOrder || (order == UINT64_MAX && candidate.size < dylib.size)) { // The new file is either a lower priority in the order file // or the same priority as the candidate but larger candidate = dylib; candidateOrder = order; candidateFound = true; } } if (candidateFound) { sortedDylibs.push_back(candidate); referencesPtr->erase(candidate.installName); for (auto& dependent : references) { (void)dependent.second.erase(candidate.installName); } auto j = std::find_if(dylibsToSort.begin(), dylibsToSort.end(), [&candidate](const DylibAndSize& dylib) { return (strcmp(candidate.installName, dylib.installName) == 0); }); if (j != dylibsToSort.end()) { dylibsToSort.erase(j); } } } // build set of dylibs that if removed will allow cache to build for (DylibAndSize& dylib : sortedDylibs) { 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(); } void SharedCacheBuilder::writeCacheHeader() { // "dyld_v1" + spaces + archName(), with enough spaces to pad to 15 bytes std::string magic = "dyld_v1"; magic.append(15 - magic.length() - strlen(_options.archs->name()), ' '); magic.append(_options.archs->name()); assert(magic.length() == 15); // 1 __TEXT segment, n __DATA segments, and 1 __LINKEDIT segment const uint32_t mappingCount = 2 + (uint32_t)_dataRegions.size(); assert(mappingCount <= DyldSharedCache::MaxMappings); // 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 = mappingCount; dyldCacheHeader->mappingWithSlideOffset = (uint32_t)(dyldCacheHeader->mappingOffset + mappingCount*sizeof(dyld_cache_mapping_and_slide_info)); dyldCacheHeader->mappingWithSlideCount = mappingCount; dyldCacheHeader->imagesOffset = (uint32_t)(dyldCacheHeader->mappingWithSlideOffset + mappingCount*sizeof(dyld_cache_mapping_and_slide_info)); dyldCacheHeader->imagesCount = (uint32_t)_sortedDylibs.size() + _aliasCount; dyldCacheHeader->dyldBaseAddress = 0; dyldCacheHeader->codeSignatureOffset = 0; dyldCacheHeader->codeSignatureSize = 0; dyldCacheHeader->slideInfoOffsetUnused = 0; dyldCacheHeader->slideInfoSizeUnused = 0; 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 = 0; dyldCacheHeader->branchPoolsCount = 0; dyldCacheHeader->imagesTextOffset = dyldCacheHeader->imagesOffset + sizeof(dyld_cache_image_info)*dyldCacheHeader->imagesCount; dyldCacheHeader->imagesTextCount = _sortedDylibs.size(); dyldCacheHeader->patchInfoAddr = 0; dyldCacheHeader->patchInfoSize = 0; dyldCacheHeader->otherImageGroupAddrUnused = 0; dyldCacheHeader->otherImageGroupSizeUnused = 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->builtFromChainedFixups= false; 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); assert(_readExecuteRegion.cacheFileOffset == 0); mappings[0].address = _readExecuteRegion.unslidLoadAddress; mappings[0].fileOffset = _readExecuteRegion.cacheFileOffset; mappings[0].size = _readExecuteRegion.sizeInUse; mappings[0].maxProt = VM_PROT_READ | VM_PROT_EXECUTE; mappings[0].initProt = VM_PROT_READ | VM_PROT_EXECUTE; for (uint32_t i = 0; i != _dataRegions.size(); ++i) { if ( i == 0 ) { assert(_dataRegions[i].cacheFileOffset == _readExecuteRegion.sizeInUse); } assert(_dataRegions[i].initProt != 0); assert(_dataRegions[i].maxProt != 0); mappings[i + 1].address = _dataRegions[i].unslidLoadAddress; mappings[i + 1].fileOffset = _dataRegions[i].cacheFileOffset; mappings[i + 1].size = _dataRegions[i].sizeInUse; mappings[i + 1].maxProt = _dataRegions[i].maxProt; mappings[i + 1].initProt = _dataRegions[i].initProt; } assert(_readOnlyRegion.cacheFileOffset == (_dataRegions.back().cacheFileOffset + _dataRegions.back().sizeInUse)); mappings[mappingCount - 1].address = _readOnlyRegion.unslidLoadAddress; mappings[mappingCount - 1].fileOffset = _readOnlyRegion.cacheFileOffset; mappings[mappingCount - 1].size = _readOnlyRegion.sizeInUse; mappings[mappingCount - 1].maxProt = VM_PROT_READ; mappings[mappingCount - 1].initProt = VM_PROT_READ; // Add in the new mappings with also have slide info dyld_cache_mapping_and_slide_info* slidableMappings = (dyld_cache_mapping_and_slide_info*)(_readExecuteRegion.buffer + dyldCacheHeader->mappingWithSlideOffset); slidableMappings[0].address = _readExecuteRegion.unslidLoadAddress; slidableMappings[0].fileOffset = _readExecuteRegion.cacheFileOffset; slidableMappings[0].size = _readExecuteRegion.sizeInUse; slidableMappings[0].maxProt = VM_PROT_READ | VM_PROT_EXECUTE; slidableMappings[0].initProt = VM_PROT_READ | VM_PROT_EXECUTE; slidableMappings[0].slideInfoFileOffset = 0; slidableMappings[0].slideInfoFileSize = 0; slidableMappings[0].flags = 0; for (uint32_t i = 0; i != _dataRegions.size(); ++i) { // Work out which flags this mapping has uint64_t flags = 0; if ( startsWith(_dataRegions[i].name, "__AUTH") ) flags |= DYLD_CACHE_MAPPING_AUTH_DATA; if ( (_dataRegions[i].name == "__AUTH_DIRTY") || (_dataRegions[i].name == "__DATA_DIRTY") ) { flags |= DYLD_CACHE_MAPPING_DIRTY_DATA; } else if ( (_dataRegions[i].name == "__AUTH_CONST") || (_dataRegions[i].name == "__DATA_CONST") ) { flags |= DYLD_CACHE_MAPPING_CONST_DATA; } assert(_dataRegions[i].initProt != 0); assert(_dataRegions[i].maxProt != 0); slidableMappings[i + 1].address = _dataRegions[i].unslidLoadAddress; slidableMappings[i + 1].fileOffset = _dataRegions[i].cacheFileOffset; slidableMappings[i + 1].size = _dataRegions[i].sizeInUse; slidableMappings[i + 1].maxProt = _dataRegions[i].maxProt; slidableMappings[i + 1].initProt = _dataRegions[i].initProt; slidableMappings[i + 1].slideInfoFileOffset = _dataRegions[i].slideInfoFileOffset; slidableMappings[i + 1].slideInfoFileSize = _dataRegions[i].slideInfoFileSize; slidableMappings[i + 1].flags = flags; } slidableMappings[mappingCount - 1].address = _readOnlyRegion.unslidLoadAddress; slidableMappings[mappingCount - 1].fileOffset = _readOnlyRegion.cacheFileOffset; slidableMappings[mappingCount - 1].size = _readOnlyRegion.sizeInUse; slidableMappings[mappingCount - 1].maxProt = VM_PROT_READ; slidableMappings[mappingCount - 1].initProt = VM_PROT_READ; slidableMappings[mappingCount - 1].slideInfoFileOffset = 0; slidableMappings[mappingCount - 1].slideInfoFileSize = 0; slidableMappings[mappingCount - 1].flags = 0; // 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 SharedCacheBuilder::processSelectorStrings(const std::vector<LoadedMachO>& executables, IMPCaches::HoleMap& selectorsHoleMap) { const bool log = false; // We only do this optimisation to reduce the size of the shared cache executable closures // Skip this is those closures are not being built if ( !_options.optimizeDyldDlopens || !_options.optimizeDyldLaunches ) return; _selectorStringsFromExecutables = 0; uint64_t totalBytesPulledIn = 0; // Don't do this optimisation on watchOS where the shared cache is too small if (_options.platform == dyld3::Platform::watchOS) return; // Get the method name coalesced section as that is where we need to put these strings CacheBuilder::CacheCoalescedText::StringSection& cacheStringSection = _coalescedText.getSectionData("__objc_methname"); for (const LoadedMachO& executable : executables) { const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)executable.loadedFileInfo.fileContent; uint64_t sizeBeforeProcessing = cacheStringSection.bufferSize; ma->forEachObjCMethodName(^(const char* methodName) { std::string_view str = methodName; if (cacheStringSection.stringsToOffsets.find(str) == cacheStringSection.stringsToOffsets.end()) { int offset = selectorsHoleMap.addStringOfSize((unsigned)str.size() + 1); cacheStringSection.stringsToOffsets[str] = offset; // If we inserted the string past the end then we need to include it in the total int possibleNewEnd = offset + (int)str.size() + 1; if (cacheStringSection.bufferSize < (uint32_t)possibleNewEnd) { cacheStringSection.bufferSize = (uint32_t)possibleNewEnd; } // if (log) printf("Selector: %s -> %s\n", ma->installName(), methodName); ++_selectorStringsFromExecutables; } }); uint64_t sizeAfterProcessing = cacheStringSection.bufferSize; totalBytesPulledIn += (sizeAfterProcessing - sizeBeforeProcessing); if ( log && (sizeBeforeProcessing != sizeAfterProcessing) ) { printf("Pulled in % 6lld bytes of selectors from %s\n", sizeAfterProcessing - sizeBeforeProcessing, executable.loadedFileInfo.path); } } _diagnostics.verbose("Pulled in %lld selector strings (%lld bytes) from executables\n", _selectorStringsFromExecutables, totalBytesPulledIn); } void SharedCacheBuilder::parseCoalescableSegments(IMPCaches::SelectorMap& selectors, IMPCaches::HoleMap& selectorsHoleMap) { const bool log = false; for (DylibInfo& dylib : _sortedDylibs) _coalescedText.parseCoalescableText(dylib.input->mappedFile.mh, dylib.textCoalescer, selectors, selectorsHoleMap); if (log) { for (const char* section : CacheCoalescedText::SupportedSections) { CacheCoalescedText::StringSection& sectionData = _coalescedText.getSectionData(section); printf("Coalesced %s from % 10lld -> % 10d, saving % 10lld bytes\n", section, sectionData.bufferSize + sectionData.savedSpace, sectionData.bufferSize, sectionData.savedSpace); } } // arm64e needs to convert CF constants to tagged pointers if ( !strcmp(_archLayout->archName, "arm64e") ) { // Find the dylib which exports the CFString ISA. It's likely CoreFoundation but it could move CacheCoalescedText::CFSection& cfStrings = _coalescedText.cfStrings; for (DylibInfo& dylib : _sortedDylibs) { const dyld3::MachOAnalyzer* ma = dylib.input->mappedFile.mh; dyld3::MachOAnalyzer::FoundSymbol foundInfo; bool foundISASymbol = ma->findExportedSymbol(_diagnostics, cfStrings.isaClassName, false, foundInfo, nullptr); if ( foundISASymbol ) { // This dylib exports the ISA, so everyone else should look here for the ISA too. if ( cfStrings.isaInstallName != nullptr ) { // Found a duplicate. We can't do anything here _diagnostics.verbose("Could not optimize CFString's due to duplicate ISA symbols"); cfStrings.isaInstallName = nullptr; break; } else { cfStrings.isaInstallName = ma->installName(); cfStrings.isaVMOffset = foundInfo.value; } } } if ( cfStrings.isaInstallName != nullptr ) { for (DylibInfo& dylib : _sortedDylibs) { _coalescedText.parseCFConstants(dylib.input->mappedFile.mh, dylib.textCoalescer); } } } } // This is the new method which will put all __DATA* mappings in to a their own mappings void SharedCacheBuilder::assignMultipleDataSegmentAddresses(uint64_t& addr, uint32_t totalProtocolDefCount) { uint64_t nextRegionFileOffset = _readExecuteRegion.sizeInUse; const size_t dylibCount = _sortedDylibs.size(); BLOCK_ACCCESSIBLE_ARRAY(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; }); bool supportsAuthFixups = false; // This tracks which segments contain authenticated data, even if their name isn't __AUTH* std::set<uint32_t> authenticatedSegments[dylibCount]; if ( strcmp(_archLayout->archName, "arm64e") == 0 ) { supportsAuthFixups = true; for (DylibInfo& dylib : _sortedDylibs) { uint64_t dylibIndex = &dylib - _sortedDylibs.data(); __block std::set<uint32_t>& authSegmentIndices = authenticatedSegments[dylibIndex]; // Put all __DATA_DIRTY segments in the __AUTH region first, then we don't need to walk their chains dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) { if ( strcmp(segInfo.segName, "__DATA_DIRTY") == 0 ) { authSegmentIndices.insert(segInfo.segIndex); stop = true; } }); dylib.input->mappedFile.mh->withChainStarts(_diagnostics, 0, ^(const dyld_chained_starts_in_image *starts) { dylib.input->mappedFile.mh->forEachFixupChainSegment(_diagnostics, starts, ^(const dyld_chained_starts_in_segment* segmentInfo, uint32_t segIndex, bool& stopSegment) { // Skip walking segments we already know are __AUTH, ie, __DATA_DIRTY if ( authSegmentIndices.count(segIndex) ) return; dylib.input->mappedFile.mh->forEachFixupInSegmentChains(_diagnostics, segmentInfo, false, ^(dyld3::MachOLoaded::ChainedFixupPointerOnDisk* fixupLoc, const dyld_chained_starts_in_segment* segInfo, bool& stopChain) { uint16_t chainedFixupsFormat = segInfo->pointer_format; assert( (chainedFixupsFormat == DYLD_CHAINED_PTR_ARM64E) || (chainedFixupsFormat == DYLD_CHAINED_PTR_ARM64E_USERLAND) || (chainedFixupsFormat == DYLD_CHAINED_PTR_ARM64E_USERLAND24) ); if ( fixupLoc->arm64e.authRebase.auth ) { authSegmentIndices.insert(segIndex); stopChain = true; return; } }); }); }); } } // Categorize each segment in each binary enum class SegmentType : uint8_t { skip, // used for non-data segments we should ignore here data, dataDirty, dataConst, auth, authDirty, authConst, }; BLOCK_ACCCESSIBLE_ARRAY(uint64_t, textSegVmAddrs, dylibCount); BLOCK_ACCCESSIBLE_ARRAY(std::vector<SegmentType>, segmentTypes, dylibCount); // Just in case __AUTH is used in a non-arm64e binary, we can force it to use data enums SegmentType authSegment = supportsAuthFixups ? SegmentType::auth : SegmentType::data; SegmentType authConstSegment = supportsAuthFixups ? SegmentType::authConst : SegmentType::dataConst; for (const DylibInfo& dylib : _sortedDylibs) { uint64_t dylibIndex = &dylib - _sortedDylibs.data(); __block std::set<uint32_t>& authSegmentIndices = authenticatedSegments[dylibIndex]; __block std::vector<SegmentType>& dylibSegmentTypes = segmentTypes[dylibIndex]; uint64_t &textSegVmAddr = textSegVmAddrs[dylibIndex]; dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) { if ( strcmp(segInfo.segName, "__TEXT") == 0 ) { textSegVmAddr = segInfo.vmAddr; } // Skip non-DATA segments if ( segInfo.protections != (VM_PROT_READ | VM_PROT_WRITE) ) { dylibSegmentTypes.push_back(SegmentType::skip); return; } // If we don't have split seg v2, then all remaining segments must look like __DATA so that they // stay contiguous if (!dylib.input->mappedFile.mh->isSplitSegV2()) { dylibSegmentTypes.push_back(SegmentType::data); return; } __block bool supportsDataConst = true; if ( dylib.input->mappedFile.mh->isSwiftLibrary() ) { uint64_t objcConstSize = 0; bool containsObjCSection = dylib.input->mappedFile.mh->findSectionContent(segInfo.segName, "__objc_const", objcConstSize); // <rdar://problem/66284631> Don't put __objc_const read-only memory as Swift has method lists we can't see if ( containsObjCSection ) supportsDataConst = false; } else if ( !strcmp(dylib.input->mappedFile.mh->installName(), "/System/Library/Frameworks/Foundation.framework/Foundation") || !strcmp(dylib.input->mappedFile.mh->installName(), "/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation") ) { // <rdar://problem/69813664> _NSTheOneTruePredicate is incompatible with __DATA_CONST supportsDataConst = false; } else if ( !strcmp(dylib.input->mappedFile.mh->installName(), "/usr/lib/system/libdispatch.dylib") ) { // rdar://72361509 (Speechrecognitiond crashing on AzulE18E123) supportsDataConst = false; } else if ( !strcmp(dylib.input->mappedFile.mh->installName(), "/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation") || !strcmp(dylib.input->mappedFile.mh->installName(), "/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation") ) { // rdar://74112547 CF writes to kCFNull constant object supportsDataConst = false; } // Don't use data const for dylibs containing resolver functions. This will be fixed in ld64 by moving their pointer atoms to __DATA if ( supportsDataConst && endsWith(segInfo.segName, "_CONST") ) { dylib.input->mappedFile.mh->forEachExportedSymbol(_diagnostics, ^(const char *symbolName, uint64_t imageOffset, uint64_t flags, uint64_t other, const char *importName, bool &stop) { if ( (flags & EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER ) != 0 ) { _diagnostics.verbose("%s: preventing use of __DATA_CONST due to resolvers\n", dylib.dylibID.c_str()); supportsDataConst = false; stop = true; } }); } // If we are still allowed to use __DATA_CONST, then make sure that we are not using pointer based method lists. These may not be written in libobjc due // to uniquing or sorting (as those are done in the builder), but clients can still call setIMP to mutate them. if ( supportsDataConst && endsWith(segInfo.segName, "_CONST") ) { uint64_t segStartVMAddr = segInfo.vmAddr; uint64_t segEndVMAddr = segInfo.vmAddr + segInfo.vmSize; auto vmAddrConverter = dylib.input->mappedFile.mh->makeVMAddrConverter(false); const uint32_t pointerSize = dylib.input->mappedFile.mh->pointerSize(); __block bool foundPointerBasedMethodList = false; auto visitMethodList = ^(uint64_t methodListVMAddr) { if ( foundPointerBasedMethodList ) return; if ( methodListVMAddr == 0 ) return; // Ignore method lists in other segments if ( (methodListVMAddr < segStartVMAddr) || (methodListVMAddr >= segEndVMAddr) ) return; auto visitMethod = ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { }; bool isRelativeMethodList = false; dylib.input->mappedFile.mh->forEachObjCMethod(methodListVMAddr, vmAddrConverter, visitMethod, &isRelativeMethodList); if ( !isRelativeMethodList ) foundPointerBasedMethodList = true; }; auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { visitMethodList(objcClass.baseMethodsVMAddr(pointerSize)); }; auto visitCategory = ^(Diagnostics& diag, uint64_t categoryVMAddr, const dyld3::MachOAnalyzer::ObjCCategory& objcCategory) { visitMethodList(objcCategory.instanceMethodsVMAddr); visitMethodList(objcCategory.classMethodsVMAddr); }; // Walk the class list Diagnostics classDiag; dylib.input->mappedFile.mh->forEachObjCClass(classDiag, vmAddrConverter, visitClass); // Walk the category list Diagnostics categoryDiag; dylib.input->mappedFile.mh->forEachObjCCategory(categoryDiag, vmAddrConverter, visitCategory); // Note we don't walk protocols as they don't have an IMP to set if ( foundPointerBasedMethodList ) { _diagnostics.verbose("%s: preventing use of read-only %s due to pointer based method list\n", dylib.dylibID.c_str(), segInfo.segName); supportsDataConst = false; } } // __AUTH_CONST if ( strcmp(segInfo.segName, "__AUTH_CONST") == 0 ) { dylibSegmentTypes.push_back(supportsDataConst ? authConstSegment : authSegment); return; } // __DATA_CONST if ( (strcmp(segInfo.segName, "__DATA_CONST") == 0) || (strcmp(segInfo.segName, "__OBJC_CONST") == 0) ) { if ( authSegmentIndices.count(segInfo.segIndex) ) { // _diagnostics.verbose("%s: treating authenticated %s as __AUTH_CONST\n", dylib.dylibID.c_str(), segInfo.segName); dylibSegmentTypes.push_back(supportsDataConst ? SegmentType::authConst : SegmentType::auth); } else { dylibSegmentTypes.push_back(supportsDataConst ? SegmentType::dataConst : SegmentType::data); } return; } // __DATA_DIRTY if ( strcmp(segInfo.segName, "__DATA_DIRTY") == 0 ) { if ( authSegmentIndices.count(segInfo.segIndex) ) { dylibSegmentTypes.push_back(SegmentType::authDirty); } else { dylibSegmentTypes.push_back(SegmentType::dataDirty); } return; } // __AUTH if ( strcmp(segInfo.segName, "__AUTH") == 0 ) { dylibSegmentTypes.push_back(authSegment); return; } // DATA if ( authSegmentIndices.count(segInfo.segIndex) ) { // _diagnostics.verbose("%s: treating authenticated %s as __AUTH\n", dylib.dylibID.c_str(), segInfo.segName); dylibSegmentTypes.push_back(SegmentType::auth); } else { dylibSegmentTypes.push_back(SegmentType::data); } }); } auto processDylibSegments = ^(SegmentType onlyType, Region& region) { for (size_t unsortedDylibIndex = 0; unsortedDylibIndex != dylibCount; ++unsortedDylibIndex) { size_t dylibIndex = unsortedDylibIndex; if ( (onlyType == SegmentType::dataDirty) || (onlyType == SegmentType::authDirty) ) dylibIndex = dirtyDataSortIndexes[dylibIndex]; DylibInfo& dylib = _sortedDylibs[dylibIndex]; const std::vector<SegmentType>& dylibSegmentTypes = segmentTypes[dylibIndex]; const uint64_t textSegVmAddr = textSegVmAddrs[dylibIndex]; bool forcePageAlignedData = false; if ( (_options.platform == dyld3::Platform::macOS) && (onlyType == SegmentType::data) ) { forcePageAlignedData = dylib.input->mappedFile.mh->hasUnalignedPointerFixups(); //if ( forcePageAlignedData ) // warning("unaligned pointer in %s\n", dylib.input->mappedFile.runtimePath.c_str()); } dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) { if ( dylibSegmentTypes[segInfo.segIndex] != onlyType ) return; // We may have coalesced the sections at the end of this segment. In that case, shrink the segment to remove them. __block size_t sizeOfSections = 0; __block bool foundCoalescedSection = false; dylib.input->mappedFile.mh->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo §Info, bool malformedSectionRange, bool &stopSection) { if (strcmp(sectInfo.segInfo.segName, segInfo.segName) != 0) return; if ( dylib.textCoalescer.sectionWasCoalesced(segInfo.segName, sectInfo.sectName)) { foundCoalescedSection = true; } else { sizeOfSections = sectInfo.sectAddr + sectInfo.sectSize - segInfo.vmAddr; } }); if (!foundCoalescedSection) sizeOfSections = segInfo.sizeOfSections; if ( !forcePageAlignedData ) { // Pack __DATA 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)sizeOfSections); uint64_t offsetInRegion = addr - region.unslidLoadAddress; SegmentMappingInfo loc; loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr; loc.segName = segInfo.segName; loc.dstSegment = region.buffer + offsetInRegion; loc.dstCacheUnslidAddress = addr; loc.dstCacheFileOffset = (uint32_t)(region.cacheFileOffset + offsetInRegion); loc.dstCacheSegmentSize = (uint32_t)sizeOfSections; loc.dstCacheFileSize = (uint32_t)copySize; loc.copySegmentSize = (uint32_t)copySize; loc.srcSegmentIndex = segInfo.segIndex; dylib.cacheLocation.push_back(loc); addr += loc.dstCacheSegmentSize; }); } // align region end addr = align(addr, _archLayout->sharedRegionAlignP2); }; struct DataRegion { const char* regionName; SegmentType dataSegment; std::optional<SegmentType> dirtySegment; // Note this is temporary as once all platforms/archs support __DATA_CONST, we can move to a DataRegion just for CONST std::optional<SegmentType> dataConstSegment; bool addCFStrings; bool addObjCRW; }; std::vector<DataRegion> dataRegions; // We only support __DATA_CONST on arm64(e) for now. bool supportDataConst = false; //supportDataConst |= strcmp(_archLayout->archName, "arm64") == 0; supportDataConst |= strcmp(_archLayout->archName, "arm64e") == 0; if ( supportDataConst ) { bool addObjCRWToData = !supportsAuthFixups; DataRegion dataWriteRegion = { "__DATA", SegmentType::data, SegmentType::dataDirty, {}, false, addObjCRWToData }; DataRegion dataConstRegion = { "__DATA_CONST", SegmentType::dataConst, {}, {}, true, false }; DataRegion authWriteRegion = { "__AUTH", SegmentType::auth, SegmentType::authDirty, {}, false, !addObjCRWToData }; DataRegion authConstRegion = { "__AUTH_CONST", SegmentType::authConst, {}, {}, false, false }; dataRegions.push_back(dataWriteRegion); dataRegions.push_back(dataConstRegion); if ( supportsAuthFixups ) { dataRegions.push_back(authWriteRegion); dataRegions.push_back(authConstRegion); } } else { DataRegion dataWriteRegion = { "__DATA", SegmentType::data, SegmentType::dataDirty, SegmentType::dataConst, false, true }; dataRegions.push_back(dataWriteRegion); } for (DataRegion& dataRegion : dataRegions) { Region region; region.buffer = (uint8_t*)_fullAllocatedBuffer + addr - _archLayout->sharedMemoryStart; region.bufferSize = 0; region.sizeInUse = 0; region.unslidLoadAddress = addr; region.cacheFileOffset = nextRegionFileOffset; region.name = dataRegion.regionName; region.initProt = endsWith(dataRegion.regionName, "_CONST") ? VM_PROT_READ : (VM_PROT_READ | VM_PROT_WRITE); region.maxProt = VM_PROT_READ | VM_PROT_WRITE; // layout all __DATA_DIRTY segments, sorted (FIXME) if (dataRegion.dirtySegment.has_value()) processDylibSegments(*dataRegion.dirtySegment, region); // layout all __DATA segments (and other r/w non-dirty, non-const, non-auth) segments processDylibSegments(dataRegion.dataSegment, region); // When __DATA_CONST is not its own DataRegion, we fold it in to the __DATA DataRegion if (dataRegion.dataConstSegment.has_value()) processDylibSegments(*dataRegion.dataConstSegment, region); // Make space for the cfstrings if ( (dataRegion.addCFStrings) && (_coalescedText.cfStrings.bufferSize != 0) ) { // Keep __DATA segments 4K or more aligned addr = align(addr, 12); uint64_t offsetInRegion = addr - region.unslidLoadAddress; CacheCoalescedText::CFSection& cacheSection = _coalescedText.cfStrings; cacheSection.bufferAddr = region.buffer + offsetInRegion; cacheSection.bufferVMAddr = addr; cacheSection.cacheFileOffset = region.cacheFileOffset + offsetInRegion; addr += cacheSection.bufferSize; } if ( dataRegion.addObjCRW ) { // reserve space for objc r/w optimization tables _objcReadWriteBufferSizeAllocated = align(computeReadWriteObjC((uint32_t)_sortedDylibs.size(), totalProtocolDefCount), 14); addr = align(addr, 4); // objc r/w section contains pointer and must be at least pointer align _objcReadWriteBuffer = region.buffer + (addr - region.unslidLoadAddress); _objcReadWriteFileOffset = (uint32_t)((_objcReadWriteBuffer - region.buffer) + region.cacheFileOffset); addr += _objcReadWriteBufferSizeAllocated; // align region end addr = align(addr, _archLayout->sharedRegionAlignP2); } // align DATA region end uint64_t endDataAddress = addr; region.bufferSize = endDataAddress - region.unslidLoadAddress; region.sizeInUse = region.bufferSize; _dataRegions.push_back(region); nextRegionFileOffset = region.cacheFileOffset + region.sizeInUse; // Only arm64 and arm64e shared caches have enough space to pad between __DATA and __DATA_CONST // All other caches are overflowing. if ( !strcmp(_archLayout->archName, "arm64") || !strcmp(_archLayout->archName, "arm64e") ) addr = align((addr + _archLayout->sharedRegionPadding), _archLayout->sharedRegionAlignP2); } // Sanity check that we didn't put the same segment in 2 different ranges for (DylibInfo& dylib : _sortedDylibs) { std::unordered_set<uint64_t> seenSegmentIndices; for (SegmentMappingInfo& segmentInfo : dylib.cacheLocation) { if ( seenSegmentIndices.count(segmentInfo.srcSegmentIndex) != 0 ) { _diagnostics.error("%s segment %s was duplicated in layout", dylib.input->mappedFile.mh->installName(), segmentInfo.segName); return; } seenSegmentIndices.insert(segmentInfo.srcSegmentIndex); } } } void SharedCacheBuilder::assignSegmentAddresses() { // calculate size of header info and where first dylib's mach_header should start size_t startOffset = sizeof(dyld_cache_header) + DyldSharedCache::MaxMappings * sizeof(dyld_cache_mapping_info); startOffset += DyldSharedCache::MaxMappings * sizeof(dyld_cache_mapping_and_slide_info); 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); // HACK!: Rebase v4 assumes that values below 0x8000 are not pointers (encoding as offsets from the cache header). // If using a minimal cache, we need to pad out the cache header to make sure a pointer doesn't fall within that range #if SUPPORT_ARCH_arm64_32 || SUPPORT_ARCH_armv7k if ( _options.cacheSupportsASLR && !_archLayout->is64 ) { if ( _archLayout->pointerDeltaMask == 0xC0000000 ) startOffset = std::max(startOffset, (size_t)0x8000); } #endif // 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 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; // We may have coalesced the sections at the end of this segment. In that case, shrink the segment to remove them. __block size_t sizeOfSections = 0; __block bool foundCoalescedSection = false; dylib.input->mappedFile.mh->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo §Info, bool malformedSectionRange, bool &stopSection) { if (strcmp(sectInfo.segInfo.segName, segInfo.segName) != 0) return; if ( dylib.textCoalescer.sectionWasCoalesced(segInfo.segName, sectInfo.sectName)) { foundCoalescedSection = true; } else { sizeOfSections = sectInfo.sectAddr + sectInfo.sectSize - segInfo.vmAddr; } }); if (!foundCoalescedSection) sizeOfSections = segInfo.sizeOfSections; // 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(sizeOfSections, 12); loc.dstCacheFileSize = (uint32_t)align(sizeOfSections, 12); loc.copySegmentSize = (uint32_t)sizeOfSections; loc.srcSegmentIndex = segInfo.segIndex; dylib.cacheLocation.push_back(loc); addr += loc.dstCacheSegmentSize; }); } // reserve space for objc optimization tables and deduped strings uint64_t objcReadOnlyBufferVMAddr = addr; _objcReadOnlyBuffer = _readExecuteRegion.buffer + (addr - _readExecuteRegion.unslidLoadAddress); // First the strings as we'll fill in the objc tables later in the optimizer for (const char* section: CacheCoalescedText::SupportedSections) { CacheCoalescedText::StringSection& cacheStringSection = _coalescedText.getSectionData(section); cacheStringSection.bufferAddr = _readExecuteRegion.buffer + (addr - _readExecuteRegion.unslidLoadAddress); cacheStringSection.bufferVMAddr = addr; addr += cacheStringSection.bufferSize; } addr = align(addr, 14); _objcReadOnlyBufferSizeUsed = addr - objcReadOnlyBufferVMAddr; uint32_t totalSelectorRefCount = (uint32_t)_selectorStringsFromExecutables; uint32_t totalClassDefCount = 0; uint32_t totalProtocolDefCount = 0; for (DylibInfo& dylib : _sortedDylibs) { dyld3::MachOAnalyzer::ObjCInfo info = dylib.input->mappedFile.mh->getObjCInfo(); totalSelectorRefCount += info.selRefCount; totalClassDefCount += info.classDefCount; totalProtocolDefCount += info.protocolDefCount; } // now that shared cache coalesces all selector strings, use that better count uint32_t coalescedSelectorCount = (uint32_t)_coalescedText.objcMethNames.stringsToOffsets.size(); if ( coalescedSelectorCount > totalSelectorRefCount ) totalSelectorRefCount = coalescedSelectorCount; addr += align(computeReadOnlyObjC(totalSelectorRefCount, totalClassDefCount, totalProtocolDefCount), 14); size_t impCachesSize = _impCachesBuilder->totalIMPCachesSize(); size_t alignedImpCachesSize = align(impCachesSize, 14); _diagnostics.verbose("Reserving %zd bytes for IMP caches (aligned to %zd)\n", impCachesSize, alignedImpCachesSize); addr += alignedImpCachesSize; _objcReadOnlyBufferSizeAllocated = addr - objcReadOnlyBufferVMAddr; // 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 = DISCONTIGUOUS_RW; else addr = align((addr + _archLayout->sharedRegionPadding), _archLayout->sharedRegionAlignP2); // __DATA* assignMultipleDataSegmentAddresses(addr, totalProtocolDefCount); // start read-only region if ( _archLayout->sharedRegionsAreDiscontiguous ) addr = DISCONTIGUOUS_RO; 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 = lastDataRegion()->cacheFileOffset + lastDataRegion()->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)); // We need one slide info header per data region, plus enough space for that regions pages // Each region will also be padded to a page-size so that the kernel can wire it. for (Region& region : _dataRegions) { uint64_t offsetInRegion = addr - _readOnlyRegion.unslidLoadAddress; region.slideInfoBuffer = _readOnlyRegion.buffer + offsetInRegion; region.slideInfoBufferSizeAllocated = align(slideInfoSize + (region.sizeInUse/4096) * _archLayout->slideInfoBytesPerPage + 0x4000, _archLayout->sharedRegionAlignP2); region.slideInfoFileOffset = _readOnlyRegion.cacheFileOffset + offsetInRegion; addr += region.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.dstCacheFileSize = (uint32_t)segInfo.sizeOfSections; loc.copySegmentSize = (uint32_t)segInfo.sizeOfSections; loc.srcSegmentIndex = segInfo.segIndex; dylib.cacheLocation.push_back(loc); addr += loc.dstCacheSegmentSize; }); } // 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; 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.dstCacheFileSize = (uint32_t)copySize; loc.copySegmentSize = (uint32_t)copySize; loc.srcSegmentIndex = segInfo.segIndex; dylib.cacheLocation.push_back(loc); addr += loc.dstCacheSegmentSize; }); } // align r/o region end addr = align(addr, _archLayout->sharedRegionAlignP2); uint64_t endReadOnlyAddress = addr; _readOnlyRegion.bufferSize = endReadOnlyAddress - _readOnlyRegion.unslidLoadAddress + 0x100000; _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; }); } } // Return the total size of the data regions, including padding between them. // Note this assumes they are contiguous, or that we don't care about including // additional space between them. uint64_t SharedCacheBuilder::dataRegionsTotalSize() const { const Region* firstRegion = nullptr; const Region* lastRegion = nullptr; for (const Region& region : _dataRegions) { if ( (firstRegion == nullptr) || (region.buffer < firstRegion->buffer) ) firstRegion = ®ion; if ( (lastRegion == nullptr) || (region.buffer > lastRegion->buffer) ) lastRegion = ®ion; } return (lastRegion->buffer - firstRegion->buffer) + lastRegion->sizeInUse; } // Return the total size of the data regions, excluding padding between them uint64_t SharedCacheBuilder::dataRegionsSizeInUse() const { size_t size = 0; for (const Region& dataRegion : _dataRegions) size += dataRegion.sizeInUse; return size; } // Return the earliest data region by address const CacheBuilder::Region* SharedCacheBuilder::firstDataRegion() const { const Region* firstRegion = nullptr; for (const Region& region : _dataRegions) { if ( (firstRegion == nullptr) || (region.buffer < firstRegion->buffer) ) firstRegion = ®ion; } return firstRegion; } // Return the lateset data region by address const CacheBuilder::Region* SharedCacheBuilder::lastDataRegion() const { const Region* lastRegion = nullptr; for (const Region& region : _dataRegions) { if ( (lastRegion == nullptr) || (region.buffer > lastRegion->buffer) ) lastRegion = ®ion; } return lastRegion; } static dyld_cache_patchable_location makePatchLocation(size_t cacheOff, dyld3::MachOAnalyzerSet::PointerMetaData pmd, uint64_t addend) { dyld_cache_patchable_location patch; patch.cacheOffset = cacheOff; patch.high7 = pmd.high8 >> 1; patch.addend = addend; patch.authenticated = pmd.authenticated; patch.usesAddressDiversity = pmd.usesAddrDiversity; patch.key = pmd.key; patch.discriminator = pmd.diversity; // check for truncations assert(patch.cacheOffset == cacheOff); assert(patch.addend == addend); assert((patch.high7 << 1) == pmd.high8); return patch; } void SharedCacheBuilder::buildImageArray(std::vector<DyldSharedCache::FileAlias>& aliases) { typedef dyld3::closure::ClosureBuilder::CachedDylibInfo CachedDylibInfo; // 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) { const dyld3::MachOLoaded* ml = (dyld3::MachOLoaded*)mh; if ( !_someDylibsUsedChainedFixups && ml->hasChainedFixups() ) _someDylibsUsedChainedFixups = true; 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())] = ml; }); // 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() }); typedef dyld3::MachOAnalyzerSet::FixupTarget FixupTarget; typedef dyld3::MachOAnalyzerSet::PointerMetaData PointerMetaData; dyld3::closure::ClosureBuilder::DylibFixupHandler handler = ^(const dyld3::MachOLoaded* fixupIn, uint64_t fixupLocRuntimeOffset, PointerMetaData pmd, const FixupTarget& target) { uint8_t* fixupLoc = (uint8_t*)fixupIn + fixupLocRuntimeOffset; uint32_t* fixupLoc32 = (uint32_t*)fixupLoc; uint64_t* fixupLoc64 = (uint64_t*)fixupLoc; uint64_t targetSymbolOffsetInCache; switch ( target.kind ) { case FixupTarget::Kind::rebase: // rebasing already done in AdjustDylibSegments, but if input dylib uses chained fixups, target might not fit if ( _archLayout->is64 ) { if ( pmd.authenticated ) _aslrTracker.setAuthData(fixupLoc, pmd.diversity, pmd.usesAddrDiversity, pmd.key); if ( pmd.high8 ) _aslrTracker.setHigh8(fixupLoc, pmd.high8); uint64_t targetVmAddr; if ( _aslrTracker.hasRebaseTarget64(fixupLoc, &targetVmAddr) ) *fixupLoc64 = targetVmAddr; else *fixupLoc64 = (uint8_t*)target.foundInImage._mh - _readExecuteRegion.buffer + target.offsetInImage + _readExecuteRegion.unslidLoadAddress; } else { uint32_t targetVmAddr; assert(_aslrTracker.hasRebaseTarget32(fixupLoc, &targetVmAddr) && "32-bit archs always store target in side table"); *fixupLoc32 = targetVmAddr; } break; case FixupTarget::Kind::bindAbsolute: if ( _archLayout->is64 ) *fixupLoc64 = target.offsetInImage; else *fixupLoc32 = (uint32_t)(target.offsetInImage); // don't record absolute targets for ASLR _aslrTracker.remove(fixupLoc); break; case FixupTarget::Kind::bindToImage: targetSymbolOffsetInCache = (uint8_t*)target.foundInImage._mh - _readExecuteRegion.buffer + target.offsetInImage - target.addend; if ( !target.weakCoalesced || !_aslrTracker.has(fixupLoc) ) { // this handler is called a second time for weak_bind info, which we ignore when building cache _aslrTracker.add(fixupLoc); if ( _archLayout->is64 ) { if ( pmd.high8 ) _aslrTracker.setHigh8(fixupLoc, pmd.high8); if ( pmd.authenticated ) _aslrTracker.setAuthData(fixupLoc, pmd.diversity, pmd.usesAddrDiversity, pmd.key); *fixupLoc64 = _archLayout->sharedMemoryStart + targetSymbolOffsetInCache + target.addend; } else { assert(targetSymbolOffsetInCache < (_readOnlyRegion.buffer - _readExecuteRegion.buffer) && "offset not into TEXT or DATA of cache file"); uint32_t targetVmAddr; if ( _aslrTracker.hasRebaseTarget32(fixupLoc, &targetVmAddr) ) *fixupLoc32 = targetVmAddr; else *fixupLoc32 = (uint32_t)(_archLayout->sharedMemoryStart + targetSymbolOffsetInCache + target.addend); } } _dylibToItsExports[target.foundInImage._mh].insert(targetSymbolOffsetInCache); if ( target.isWeakDef ) _dylibWeakExports.insert({ target.foundInImage._mh, targetSymbolOffsetInCache }); _exportsToUses[targetSymbolOffsetInCache].push_back(makePatchLocation(fixupLoc - _readExecuteRegion.buffer, pmd, target.addend)); _exportsToName[targetSymbolOffsetInCache] = target.foundSymbolName; break; case FixupTarget::Kind::bindMissingSymbol: // if there are missing symbols, makeDyldCacheImageArray() will error break; } }; // build ImageArray for all dylibs in dyld cache dyld3::closure::PathOverrides pathOverrides; dyld3::RootsChecker rootsChecker; dyld3::closure::ClosureBuilder cb(dyld3::closure::kFirstDyldCacheImageNum, _fileSystem, rootsChecker, cache, false, *_options.archs, pathOverrides, dyld3::closure::ClosureBuilder::AtPath::none, false, nullptr, _options.platform, handler); 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(dylibs, aliasesArray); if ( cb.diagnostics().hasError() ) { _diagnostics.error("%s", cb.diagnostics().errorMessage().c_str()); return; } } static bool operator==(const dyld_cache_patchable_location& a, const dyld_cache_patchable_location& b) { return a.cacheOffset == b.cacheOffset; } void SharedCacheBuilder::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); // build set of functions to never stub-eliminate because tools may need to override them std::unordered_set<std::string> alwaysGeneratePatch; for (const char* const* p=_s_neverStubEliminateSymbols; *p != nullptr; ++p) alwaysGeneratePatch.insert(*p); // Add the patches for the image array. __block uint64_t numPatchImages = _imageArray->size(); __block uint64_t numPatchExports = 0; __block uint64_t numPatchLocations = 0; __block uint64_t numPatchExportNameBytes = 0; auto needsPatch = [&](bool dylibNeedsPatching, const dyld3::MachOLoaded* mh, CacheOffset offset) -> bool { if (dylibNeedsPatching) return true; if (_dylibWeakExports.find({ mh, offset }) != _dylibWeakExports.end()) return true; const std::string& exportName = _exportsToName[offset]; return alwaysGeneratePatch.find(exportName) != alwaysGeneratePatch.end(); }; // First calculate how much space we need const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer; cache->forEachImage(^(const mach_header* mh, const char* installName) { const dyld3::MachOLoaded* ml = (const dyld3::MachOLoaded*)mh; const std::set<CacheOffset>& dylibExports = _dylibToItsExports[ml]; // On a customer cache, only store patch locations for interposable dylibs and weak binding bool dylibNeedsPatching = cache->isOverridablePath(installName); uint64_t numDylibExports = 0; for (CacheOffset exportCacheOffset : dylibExports) { if (!needsPatch(dylibNeedsPatching, ml, exportCacheOffset)) continue; std::vector<dyld_cache_patchable_location>& uses = _exportsToUses[exportCacheOffset]; uses.erase(std::unique(uses.begin(), uses.end()), uses.end()); numPatchLocations += uses.size(); std::string exportName = _exportsToName[exportCacheOffset]; numPatchExportNameBytes += exportName.size() + 1; } numPatchExports += numDylibExports; }); // Now reserve the space __block std::vector<dyld_cache_image_patches> patchImages; __block std::vector<dyld_cache_patchable_export> patchExports; __block std::vector<dyld_cache_patchable_location> patchLocations; __block std::vector<char> patchExportNames; patchImages.reserve(numPatchImages); patchExports.reserve(numPatchExports); patchLocations.reserve(numPatchLocations); patchExportNames.reserve(numPatchExportNameBytes); // And now fill it with the patch data cache->forEachImage(^(const mach_header* mh, const char* installName) { const dyld3::MachOLoaded* ml = (const dyld3::MachOLoaded*)mh; const std::set<CacheOffset>& dylibExports = _dylibToItsExports[ml]; // On a customer cache, only store patch locations for interposable dylibs and weak binding bool dylibNeedsPatching = cache->isOverridablePath(installName); // Add the patch image which points in to the exports dyld_cache_image_patches patchImage; patchImage.patchExportsStartIndex = (uint32_t)patchExports.size(); patchImage.patchExportsCount = 0; // Then add each export which points to a list of locations and a name for (CacheOffset exportCacheOffset : dylibExports) { if (!needsPatch(dylibNeedsPatching, ml, exportCacheOffset)) continue; ++patchImage.patchExportsCount; std::vector<dyld_cache_patchable_location>& uses = _exportsToUses[exportCacheOffset]; dyld_cache_patchable_export cacheExport; cacheExport.cacheOffsetOfImpl = (uint32_t)exportCacheOffset; cacheExport.patchLocationsStartIndex = (uint32_t)patchLocations.size(); cacheExport.patchLocationsCount = (uint32_t)uses.size(); cacheExport.exportNameOffset = (uint32_t)patchExportNames.size(); patchExports.push_back(cacheExport); // Now add the list of locations. patchLocations.insert(patchLocations.end(), uses.begin(), uses.end()); // And add the export name const std::string& exportName = _exportsToName[exportCacheOffset]; patchExportNames.insert(patchExportNames.end(), &exportName[0], &exportName[0] + exportName.size() + 1); } patchImages.push_back(patchImage); }); while ( (patchExportNames.size() % 4) != 0 ) patchExportNames.push_back('\0'); uint64_t patchInfoSize = sizeof(dyld_cache_patch_info); patchInfoSize += sizeof(dyld_cache_image_patches) * patchImages.size(); patchInfoSize += sizeof(dyld_cache_patchable_export) * patchExports.size(); patchInfoSize += sizeof(dyld_cache_patchable_location) * patchLocations.size(); patchInfoSize += patchExportNames.size(); // check for fit uint64_t imageArraySize = _imageArray->size(); size_t freeSpace = _readOnlyRegion.bufferSize - _readOnlyRegion.sizeInUse; if ( (imageArraySize+trieBytes.size()+patchInfoSize) > freeSpace ) { _diagnostics.error("cache buffer too small to hold ImageArray and Trie (buffer size=%lldMB, imageArray size=%lldMB, trie size=%luKB, patch size=%lluKB, free space=%ldMB)", _allocatedBufferSize/1024/1024, imageArraySize/1024/1024, trieBytes.size()/1024, patchInfoSize/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()); // Also write out the patch info dyldCache->header.patchInfoAddr = dyldCache->header.dylibsTrieAddr + dyldCache->header.dylibsTrieSize; dyldCache->header.patchInfoSize = patchInfoSize; dyld_cache_patch_info patchInfo; patchInfo.patchTableArrayAddr = dyldCache->header.patchInfoAddr + sizeof(dyld_cache_patch_info); patchInfo.patchTableArrayCount = patchImages.size(); patchInfo.patchExportArrayAddr = patchInfo.patchTableArrayAddr + (patchInfo.patchTableArrayCount * sizeof(dyld_cache_image_patches)); patchInfo.patchExportArrayCount = patchExports.size(); patchInfo.patchLocationArrayAddr = patchInfo.patchExportArrayAddr + (patchInfo.patchExportArrayCount * sizeof(dyld_cache_patchable_export)); patchInfo.patchLocationArrayCount = patchLocations.size(); patchInfo.patchExportNamesAddr = patchInfo.patchLocationArrayAddr + (patchInfo.patchLocationArrayCount * sizeof(dyld_cache_patchable_location)); patchInfo.patchExportNamesSize = patchExportNames.size(); ::memcpy(_readOnlyRegion.buffer + dyldCache->header.patchInfoAddr - _readOnlyRegion.unslidLoadAddress, &patchInfo, sizeof(dyld_cache_patch_info)); ::memcpy(_readOnlyRegion.buffer + patchInfo.patchTableArrayAddr - _readOnlyRegion.unslidLoadAddress, &patchImages[0], sizeof(patchImages[0]) * patchImages.size()); ::memcpy(_readOnlyRegion.buffer + patchInfo.patchExportArrayAddr - _readOnlyRegion.unslidLoadAddress, &patchExports[0], sizeof(patchExports[0]) * patchExports.size()); ::memcpy(_readOnlyRegion.buffer + patchInfo.patchLocationArrayAddr - _readOnlyRegion.unslidLoadAddress, &patchLocations[0], sizeof(patchLocations[0]) * patchLocations.size()); ::memcpy(_readOnlyRegion.buffer + patchInfo.patchExportNamesAddr - _readOnlyRegion.unslidLoadAddress, &patchExportNames[0], patchExportNames.size()); _readOnlyRegion.sizeInUse += align(imageArraySize+trieBytes.size()+patchInfoSize,14); // Free the underlying image array buffer _imageArray->deallocate(); _imageArray = nullptr; } void SharedCacheBuilder::addOtherImageArray(const std::vector<LoadedMachO>& otherDylibsAndBundles, std::vector<const LoadedMachO*>& overflowDylibs) { DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer; dyld3::closure::PathOverrides pathOverrides; dyld3::closure::FileSystemNull nullFileSystem; dyld3::RootsChecker rootsChecker; dyld3::closure::ClosureBuilder cb(dyld3::closure::kFirstOtherOSImageNum, nullFileSystem, rootsChecker, cache, false, *_options.archs, pathOverrides, dyld3::closure::ClosureBuilder::AtPath::none, false, nullptr, _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, "staged_system_apps/") ) 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) { // Sort mac before iOSMac bool isIOSMacA = strncmp(a.path, "/System/iOSSupport/", 19) == 0; bool isIOSMacB = strncmp(b.path, "/System/iOSSupport/", 19) == 0; if (isIOSMacA != isIOSMacB) return !isIOSMacA; 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); // Free the underlying buffer otherImageArray->deallocate(); } void SharedCacheBuilder::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; } // prebuilt closures use the cdhash of the dylib to verify that the dylib is still the same // at runtime as when the shared cache processed it. We must have a code signature to record this information uint32_t codeSigFileOffset; uint32_t codeSigSize; if ( !loadedMachO.mappedFile.mh->hasCodeSignature(codeSigFileOffset, codeSigSize) ) { return; } dyld3::closure::PathOverrides pathOverrides; dyld3::RootsChecker rootsChecker; dyld3::closure::ClosureBuilder builder(dyld3::closure::kFirstLaunchClosureImageNum, _fileSystem, rootsChecker, dyldCache, false, *_options.archs, pathOverrides, dyld3::closure::ClosureBuilder::AtPath::all, false, nullptr, _options.platform, nullptr); bool issetuid = false; if ( this->_options.platform == dyld3::Platform::macOS || dyld3::MachOFile::isSimulatorPlatform(this->_options.platform) ) _fileSystem.fileExists(loadedMachO.loadedFileInfo.path, nullptr, nullptr, &issetuid, nullptr); 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); } void SharedCacheBuilder::emitContantObjects() { if ( _coalescedText.cfStrings.bufferSize == 0 ) return; assert(_coalescedText.cfStrings.isaInstallName != nullptr); DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer; __block uint64_t targetSymbolOffsetInCache = 0; __block const dyld3::MachOAnalyzer* targetSymbolMA = nullptr; __block const dyld3::MachOAnalyzer* libdyldMA = nullptr; cache->forEachImage(^(const mach_header* mh, const char* installName) { const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; if ( strcmp(installName, "/usr/lib/system/libdyld.dylib") == 0 ) { libdyldMA = ma; } if ( targetSymbolOffsetInCache != 0 ) return; if ( strcmp(installName, _coalescedText.cfStrings.isaInstallName) != 0 ) return; dyld3::MachOAnalyzer::FoundSymbol foundInfo; bool foundSymbol = ma->findExportedSymbol(_diagnostics, _coalescedText.cfStrings.isaClassName, false, foundInfo, nullptr); if ( foundSymbol ) { targetSymbolOffsetInCache = (uint8_t*)ma - _readExecuteRegion.buffer + foundInfo.value; targetSymbolMA = ma; } }); if ( targetSymbolOffsetInCache == 0 ) { _diagnostics.error("Could not find export of '%s' in '%s'", _coalescedText.cfStrings.isaClassName, _coalescedText.cfStrings.isaInstallName); return; } if ( libdyldMA == nullptr ) { _diagnostics.error("Could not libdyld.dylib in shared cache"); return; } // If all binds to this symbol were via CF constants, then we'll never have seen the ISA patch export // os add it now just in case _dylibToItsExports[targetSymbolMA].insert(targetSymbolOffsetInCache); _exportsToName[targetSymbolOffsetInCache] = _coalescedText.cfStrings.isaClassName; // CFString's have so far just been memcpy'ed from the source dylib to the shared cache. // We now need to rewrite their ISAs to be rebases to the ___CFConstantStringClassReference class const uint64_t cfStringAtomSize = (uint64_t)DyldSharedCache::ConstantClasses::cfStringAtomSize; assert( (_coalescedText.cfStrings.bufferSize % cfStringAtomSize) == 0); for (uint64_t bufferOffset = 0; bufferOffset != _coalescedText.cfStrings.bufferSize; bufferOffset += cfStringAtomSize) { uint8_t* atomBuffer = _coalescedText.cfStrings.bufferAddr + bufferOffset; // The ISA fixup is at an offset of 0 in to the atom uint8_t* fixupLoc = atomBuffer; // We purposefully want to remove the pointer authentication from the ISA so // just use an empty pointer metadata dyld3::Loader::PointerMetaData pmd; uint64_t addend = 0; _exportsToUses[targetSymbolOffsetInCache].push_back(makePatchLocation(fixupLoc - _readExecuteRegion.buffer, pmd, addend)); *(uint64_t*)fixupLoc = _archLayout->sharedMemoryStart + targetSymbolOffsetInCache; _aslrTracker.add(fixupLoc); } // Set the ranges in the libdyld in the shared cache. At runtime we can use these to quickly check if a given address // is a valid constant typedef std::pair<const uint8_t*, const uint8_t*> ObjCConstantRange; std::pair<const void*, uint64_t> sharedCacheRanges = cache->getObjCConstantRange(); uint64_t numRanges = sharedCacheRanges.second / sizeof(ObjCConstantRange); dyld3::Array<ObjCConstantRange> rangeArray((ObjCConstantRange*)sharedCacheRanges.first, numRanges, numRanges); if ( numRanges > dyld_objc_string_kind ) { rangeArray[dyld_objc_string_kind].first = (const uint8_t*)_coalescedText.cfStrings.bufferVMAddr; rangeArray[dyld_objc_string_kind].second = rangeArray[dyld_objc_string_kind].first + _coalescedText.cfStrings.bufferSize; _aslrTracker.add(&rangeArray[dyld_objc_string_kind].first); _aslrTracker.add(&rangeArray[dyld_objc_string_kind].second); } // Update the __SHARED_CACHE range in libdyld to contain the cf/objc constants libdyldMA->forEachLoadCommand(_diagnostics, ^(const load_command* cmd, bool& stop) { // We don't handle 32-bit as this is only needed for pointer authentication assert(cmd->cmd != LC_SEGMENT); if ( cmd->cmd == LC_SEGMENT_64 ) { segment_command_64* seg = (segment_command_64*)cmd; if ( strcmp(seg->segname, "__SHARED_CACHE") == 0 ) { // Update the range of this segment, and any sections inside seg->vmaddr = _coalescedText.cfStrings.bufferVMAddr; seg->vmsize = _coalescedText.cfStrings.bufferSize; seg->fileoff = _coalescedText.cfStrings.cacheFileOffset; seg->fileoff = _coalescedText.cfStrings.bufferSize; section_64* const sectionsStart = (section_64*)((char*)seg + sizeof(struct segment_command_64)); section_64* const sectionsEnd = §ionsStart[seg->nsects]; for (section_64* sect=sectionsStart; sect < sectionsEnd; ++sect) { if ( !strcmp(sect->sectname, "__cfstring") ) { sect->addr = _coalescedText.cfStrings.bufferVMAddr; sect->size = _coalescedText.cfStrings.bufferSize; sect->offset = (uint32_t)_coalescedText.cfStrings.cacheFileOffset; } } stop = true; } } }); } bool SharedCacheBuilder::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); const uint32_t mappingsCount = cacheHeader->mappingCount; // Check the sizes of all the regions are correct assert(_readExecuteRegion.sizeInUse == mappings[0].size); for (uint32_t i = 0; i != _dataRegions.size(); ++i) { assert(_dataRegions[i].sizeInUse == mappings[i + 1].size); } assert(_readOnlyRegion.sizeInUse == mappings[mappingsCount - 1].size); // Check the file offsets of all the regions are correct assert(_readExecuteRegion.cacheFileOffset == mappings[0].fileOffset); for (uint32_t i = 0; i != _dataRegions.size(); ++i) { assert(_dataRegions[i].cacheFileOffset == mappings[i + 1].fileOffset); } assert(_readOnlyRegion.cacheFileOffset == mappings[mappingsCount - 1].fileOffset); assert(_codeSignatureRegion.sizeInUse == cacheHeader->codeSignatureSize); assert(cacheHeader->codeSignatureOffset == _readOnlyRegion.cacheFileOffset+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse); // Make sure the slidable mappings have the same ranges as the original mappings const dyld_cache_mapping_and_slide_info* slidableMappings = (dyld_cache_mapping_and_slide_info*)(_readExecuteRegion.buffer + cacheHeader->mappingWithSlideOffset); assert(cacheHeader->mappingCount == cacheHeader->mappingWithSlideCount); for (uint32_t i = 0; i != cacheHeader->mappingCount; ++i) { assert(mappings[i].address == slidableMappings[i].address); assert(mappings[i].size == slidableMappings[i].size); assert(mappings[i].fileOffset == slidableMappings[i].fileOffset); assert(mappings[i].maxProt == slidableMappings[i].maxProt); assert(mappings[i].initProt == slidableMappings[i].initProt); } // Now that we know everything is correct, actually copy the data cacheSizeCallback(_readExecuteRegion.sizeInUse+dataRegionsSizeInUse()+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse+_codeSignatureRegion.sizeInUse); bool fullyWritten = copyCallback(_readExecuteRegion.buffer, _readExecuteRegion.sizeInUse, mappings[0].fileOffset); for (uint32_t i = 0; i != _dataRegions.size(); ++i) { fullyWritten &= copyCallback(_dataRegions[i].buffer, _dataRegions[i].sizeInUse, mappings[i + 1].fileOffset); } fullyWritten &= copyCallback(_readOnlyRegion.buffer, _readOnlyRegion.sizeInUse, mappings[cacheHeader->mappingCount - 1].fileOffset); if ( _localSymbolsRegion.sizeInUse != 0 ) { assert(cacheHeader->localSymbolsOffset == mappings[cacheHeader->mappingCount - 1].fileOffset+_readOnlyRegion.sizeInUse); fullyWritten &= copyCallback(_localSymbolsRegion.buffer, _localSymbolsRegion.sizeInUse, cacheHeader->localSymbolsOffset); } fullyWritten &= copyCallback(_codeSignatureRegion.buffer, _codeSignatureRegion.sizeInUse, cacheHeader->codeSignatureOffset); return fullyWritten; } void SharedCacheBuilder::writeFile(const std::string& path) { std::string pathTemplate = path + "-XXXXXX"; size_t templateLen = strlen(pathTemplate.c_str())+2; BLOCK_ACCCESSIBLE_ARRAY(char, pathTemplateSpace, templateLen); strlcpy(pathTemplateSpace, pathTemplate.c_str(), templateLen); int fd = mkstemp(pathTemplateSpace); if ( fd != -1 ) { auto cacheSizeCallback = ^(uint64_t size) { // set final cache file size (may help defragment file) ::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; }; // <rdar://problem/55370916> TOCTOU: verify path is still a realpath (not changed) char tempPath[MAXPATHLEN]; if ( ::fcntl(fd, F_GETPATH, tempPath) == 0 ) { size_t tempPathLen = strlen(tempPath); if ( tempPathLen > 7 ) tempPath[tempPathLen-7] = '\0'; // remove trailing -xxxxxx if ( path != tempPath ) { _diagnostics.error("output file path changed from: '%s' to: '%s'", path.c_str(), tempPath); ::close(fd); return; } } else { _diagnostics.error("unable to fcntl(fd, F_GETPATH) on output file"); ::close(fd); return; } bool fullyWritten = writeCache(cacheSizeCallback, copyCallback); if ( fullyWritten ) { ::fchmod(fd, S_IRUSR|S_IRGRP|S_IROTH); // mkstemp() makes file "rw-------", switch it to "r--r--r--" // <rdar://problem/55370916> TOCTOU: verify path is still a realpath (not changed) // For MRM bringup, dyld installs symlinks from: // dyld_shared_cache_x86_64 -> ../../../../System/Library/dyld/dyld_shared_cache_x86_64 // dyld_shared_cache_x86_64h -> ../../../../System/Library/dyld/dyld_shared_cache_x86_64h // We don't want to follow that symlink when we install the cache, but instead write over it auto lastSlash = path.find_last_of("/"); if ( lastSlash != std::string::npos ) { std::string directoryPath = path.substr(0, lastSlash); char resolvedPath[PATH_MAX]; ::realpath(directoryPath.c_str(), resolvedPath); // Note: if the target cache file does not already exist, realpath() will return NULL, but still fill in the path buffer if ( directoryPath != resolvedPath ) { _diagnostics.error("output directory file path changed from: '%s' to: '%s'", directoryPath.c_str(), resolvedPath); return; } } if ( ::rename(pathTemplateSpace, path.c_str()) == 0) { ::close(fd); return; // success } else { _diagnostics.error("could not rename file '%s' to: '%s'", pathTemplateSpace, path.c_str()); } } else { _diagnostics.error("could not write file %s", pathTemplateSpace); } ::close(fd); ::unlink(pathTemplateSpace); } else { _diagnostics.error("could not open file %s", pathTemplateSpace); } } void SharedCacheBuilder::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 SharedCacheBuilder::writeMapFile(const std::string& path) { std::string mapContent = getMapFileBuffer(); safeSave(mapContent.c_str(), mapContent.size(), path); } std::string SharedCacheBuilder::getMapFileBuffer() const { const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer; return cache->mapFile(); } std::string SharedCacheBuilder::getMapFileJSONBuffer(const std::string& cacheDisposition) const { const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer; return cache->generateJSONMap(cacheDisposition.c_str()); } void SharedCacheBuilder::markPaddingInaccessible() { // region between RX and RW uint8_t* startPad1 = _readExecuteRegion.buffer+_readExecuteRegion.sizeInUse; uint8_t* endPad1 = firstDataRegion()->buffer; ::vm_protect(mach_task_self(), (vm_address_t)startPad1, endPad1-startPad1, false, 0); // region between RW and RO const Region* lastRegion = lastDataRegion(); uint8_t* startPad2 = lastRegion->buffer+lastRegion->sizeInUse; uint8_t* endPad2 = _readOnlyRegion.buffer; ::vm_protect(mach_task_self(), (vm_address_t)startPad2, endPad2-startPad2, false, 0); } void SharedCacheBuilder::forEachCacheDylib(void (^callback)(const std::string& path)) { for (const DylibInfo& dylibInfo : _sortedDylibs) callback(dylibInfo.dylibID); } void SharedCacheBuilder::forEachCacheSymlink(void (^callback)(const std::string& path)) { const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer; const dyld3::closure::ImageArray* images = cache->cachedDylibsImageArray(); if ( images == nullptr ) return; // Aliases we folded in to the cache are in the cache dylib closures images->forEachImage(^(const dyld3::closure::Image *image, bool &stop) { image->forEachAlias(^(const char *aliasPath, bool &stop) { callback(aliasPath); }); }); } uint64_t SharedCacheBuilder::pathHash(const char* path) { uint64_t sum = 0; for (const char* s=path; *s != '\0'; ++s) sum += sum*4 + *s; return sum; } void SharedCacheBuilder::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; } }); }); } void SharedCacheBuilder::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; } // 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; } 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 SharedCacheBuilder::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. [[clang::fallthrough]]; case DyldSharedCache::SHA1only: #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wdeprecated-declarations" dscHashType = CS_HASHTYPE_SHA1; dscHashSize = CS_HASH_SIZE_SHA1; dscDigestFormat = kCCDigestSHA1; #pragma clang diagnostic pop break; case DyldSharedCache::SHA256only: dscHashType = CS_HASHTYPE_SHA256; dscHashSize = CS_HASH_SIZE_SHA256; dscDigestFormat = kCCDigestSHA256; break; default: _diagnostics.error("codeSigningDigestMode has unknown, unexpected value %d, bailing out.", _options.codeSigningDigestMode); return; } std::string cacheIdentifier = "com.apple.dyld.cache."; cacheIdentifier += _options.archs->name(); if ( _options.dylibsRemovedDuringMastering ) { if ( _options.optimizeStubs ) cacheIdentifier += ".release"; else cacheIdentifier += ".development"; } // get pointers into shared cache buffer size_t inBbufferSize = _readExecuteRegion.sizeInUse+dataRegionsSizeInUse()+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse; const uint16_t pageSize = _archLayout->csPageSize; // 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 + pageSize - 1) / pageSize); 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(pageSize); // 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(pageSize); // 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; struct SlotRange { uint64_t start = 0; uint64_t end = 0; const uint8_t* buffer = nullptr; }; std::vector<SlotRange> regionSlots; // __TEXT regionSlots.push_back({ 0, (_readExecuteRegion.sizeInUse / pageSize), _readExecuteRegion.buffer }); // __DATA for (const Region& dataRegion : _dataRegions) { // The first data region starts at the end of __TEXT, and subsequent regions are // after the previous __DATA region. uint64_t previousEnd = regionSlots.back().end; uint64_t numSlots = dataRegion.sizeInUse / pageSize; regionSlots.push_back({ previousEnd, previousEnd + numSlots, dataRegion.buffer }); } // __LINKEDIT { uint64_t previousEnd = regionSlots.back().end; uint64_t numSlots = _readOnlyRegion.sizeInUse / pageSize; regionSlots.push_back({ previousEnd, previousEnd + numSlots, _readOnlyRegion.buffer }); } // local symbols if ( _localSymbolsRegion.sizeInUse != 0 ) { uint64_t previousEnd = regionSlots.back().end; uint64_t numSlots = _localSymbolsRegion.sizeInUse / pageSize; regionSlots.push_back({ previousEnd, previousEnd + numSlots, _localSymbolsRegion.buffer }); } auto codeSignPage = ^(size_t i) { // move to correct region for (const SlotRange& slotRange : regionSlots) { if ( (i >= slotRange.start) && (i < slotRange.end) ) { const uint8_t* code = slotRange.buffer + ((i - slotRange.start) * pageSize); CCDigest(dscDigestFormat, code, pageSize, hashSlot + (i * dscHashSize)); if ( agile ) { CCDigest(kCCDigestSHA256, code, pageSize, hash256Slot + (i * CS_HASH_SIZE_SHA256)); } return; } } assert(0 && "Out of range slot"); }; // compute hashes dispatch_apply(slotCount, DISPATCH_APPLY_AUTO, ^(size_t i) { codeSignPage(i); }); // Now that we have a code signature, compute a cache UUID by hashing the code signature blob { uint8_t* uuidLoc = cache->uuid; assert(uuid_is_null(uuidLoc)); static_assert(offsetof(dyld_cache_header, uuid) / CS_PAGE_SIZE_4K == 0, "uuid is expected in the first page of the cache"); uint8_t fullDigest[CC_SHA256_DIGEST_LENGTH]; CC_SHA256((const void*)cd, (unsigned)cdSize, fullDigest); memcpy(uuidLoc, fullDigest, 16); // <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, because we modified it by setting uuid in header 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 SharedCacheBuilder::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 SharedCacheBuilder::cdHashFirst() { return cdHash(_cdHashFirst); } const std::string SharedCacheBuilder::cdHashSecond() { return cdHash(_cdHashSecond); } const std::string SharedCacheBuilder::uuid() const { dyld_cache_header* cache = (dyld_cache_header*)_readExecuteRegion.buffer; uuid_string_t uuidStr; uuid_unparse(cache->uuid, uuidStr); return uuidStr; } void SharedCacheBuilder::forEachDylibInfo(void (^callback)(const DylibInfo& dylib, Diagnostics& dylibDiag)) { for (const DylibInfo& dylibInfo : _sortedDylibs) { // The shared cache builder doesn't use per-dylib errors right now // so just share the global diagnostics callback(dylibInfo, _diagnostics); } } template <typename P> bool SharedCacheBuilder::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 (0x%0lX) does not point within cache. lastOffset=0x%04X, seg=%s, dylib=%s\n", (long)lastValue, 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); uint8_t highByte; if ( _aslrTracker.hasHigh8(lastLoc, &highByte) ) { uint64_t tbi = (uint64_t)highByte << 56; newLastValue |= tbi; } 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]; pint_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; } pint_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 SharedCacheBuilder::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 SharedCacheBuilder::writeSlideInfoV2(const bool bitmapForAllDataRegions[], unsigned dataPageCountForAllDataRegions) { typedef typename P::uint_t pint_t; typedef typename P::E E; const uint32_t pageSize = _aslrTracker.pageSize(); const uint8_t* firstDataRegionBuffer = firstDataRegion()->buffer; for (uint32_t dataRegionIndex = 0; dataRegionIndex != _dataRegions.size(); ++dataRegionIndex) { Region& dataRegion = _dataRegions[dataRegionIndex]; // fill in fixed info assert(dataRegion.slideInfoFileOffset != 0); assert((dataRegion.sizeInUse % pageSize) == 0); unsigned dataPageCount = (uint32_t)dataRegion.sizeInUse / pageSize; dyld_cache_slide_info2* info = (dyld_cache_slide_info2*)dataRegion.slideInfoBuffer; info->version = 2; info->page_size = pageSize; info->delta_mask = _archLayout->pointerDeltaMask; info->value_add = _archLayout->useValueAdd ? _archLayout->sharedMemoryStart : 0; // set page starts and extras for each page std::vector<uint16_t> pageStarts; std::vector<uint16_t> pageExtras; pageStarts.reserve(dataPageCount); const size_t bitmapEntriesPerPage = (sizeof(bool)*(pageSize/4)); uint8_t* pageContent = dataRegion.buffer; unsigned numPagesFromFirstDataRegion = (uint32_t)(dataRegion.buffer - firstDataRegionBuffer) / pageSize; assert((numPagesFromFirstDataRegion + dataPageCount) <= dataPageCountForAllDataRegions); const bool* bitmapForRegion = (const bool*)bitmapForAllDataRegions + (bitmapEntriesPerPage * numPagesFromFirstDataRegion); const bool* bitmapForPage = bitmapForRegion; 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); dataRegion.slideInfoFileSize = slideInfoSize; if ( dataRegion.slideInfoFileSize > dataRegion.slideInfoBufferSizeAllocated ) { _diagnostics.error("kernel slide info overflow buffer"); } // Update the mapping entry on the cache header const dyld_cache_header* cacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer; dyld_cache_mapping_and_slide_info* slidableMappings = (dyld_cache_mapping_and_slide_info*)(_readExecuteRegion.buffer + cacheHeader->mappingWithSlideOffset); slidableMappings[1 + dataRegionIndex].slideInfoFileSize = dataRegion.slideInfoFileSize; //fprintf(stderr, "pageCount=%u, page_starts_count=%lu, page_extras_count=%lu\n", dataPageCount, pageStarts.size(), pageExtras.size()); } } #if SUPPORT_ARCH_arm64_32 || SUPPORT_ARCH_armv7k // 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 SharedCacheBuilder::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 SharedCacheBuilder::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 SharedCacheBuilder::writeSlideInfoV4(const bool bitmapForAllDataRegions[], unsigned dataPageCountForAllDataRegions) { typedef typename P::uint_t pint_t; typedef typename P::E E; const uint32_t pageSize = _aslrTracker.pageSize(); const uint8_t* firstDataRegionBuffer = firstDataRegion()->buffer; for (uint32_t dataRegionIndex = 0; dataRegionIndex != _dataRegions.size(); ++dataRegionIndex) { Region& dataRegion = _dataRegions[dataRegionIndex]; // fill in fixed info assert(dataRegion.slideInfoFileOffset != 0); assert((dataRegion.sizeInUse % pageSize) == 0); unsigned dataPageCount = (uint32_t)dataRegion.sizeInUse / pageSize; dyld_cache_slide_info4* info = (dyld_cache_slide_info4*)dataRegion.slideInfoBuffer; info->version = 4; info->page_size = pageSize; info->delta_mask = _archLayout->pointerDeltaMask; info->value_add = info->value_add = _archLayout->useValueAdd ? _archLayout->sharedMemoryStart : 0; // set page starts and extras for each page std::vector<uint16_t> pageStarts; std::vector<uint16_t> pageExtras; pageStarts.reserve(dataPageCount); const size_t bitmapEntriesPerPage = (sizeof(bool)*(pageSize/4)); uint8_t* pageContent = dataRegion.buffer; unsigned numPagesFromFirstDataRegion = (uint32_t)(dataRegion.buffer - firstDataRegionBuffer) / pageSize; assert((numPagesFromFirstDataRegion + dataPageCount) <= dataPageCountForAllDataRegions); const bool* bitmapForRegion = (const bool*)bitmapForAllDataRegions + (bitmapEntriesPerPage * numPagesFromFirstDataRegion); const bool* bitmapForPage = bitmapForRegion; 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); dataRegion.slideInfoFileSize = slideInfoSize; if ( dataRegion.slideInfoFileSize > dataRegion.slideInfoBufferSizeAllocated ) { _diagnostics.error("kernel slide info overflow buffer"); } // Update the mapping entry on the cache header const dyld_cache_header* cacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer; dyld_cache_mapping_and_slide_info* slidableMappings = (dyld_cache_mapping_and_slide_info*)(_readExecuteRegion.buffer + cacheHeader->mappingWithSlideOffset); slidableMappings[1 + dataRegionIndex].slideInfoFileSize = dataRegion.slideInfoFileSize; //fprintf(stderr, "pageCount=%u, page_starts_count=%lu, page_extras_count=%lu\n", dataPageCount, pageStarts.size(), pageExtras.size()); } } #endif /* void CacheBuilder::writeSlideInfoV1() { // build one 128-byte bitmap per page (4096) of DATA uint8_t* const dataStart = (uint8_t*)_buffer.get() + regions[1].fileOffset; uint8_t* const dataEnd = dataStart + regions[1].size; const long bitmapSize = (dataEnd - dataStart)/(4*8); uint8_t* bitmap = (uint8_t*)calloc(bitmapSize, 1); for (void* p : _pointersForASLR) { if ( (p < dataStart) || ( p > dataEnd) ) terminate("DATA pointer for sliding, out of range\n"); long offset = (long)((uint8_t*)p - dataStart); if ( (offset % 4) != 0 ) terminate("pointer not 4-byte aligned in DATA offset 0x%08lX\n", offset); long byteIndex = offset / (4*8); long bitInByte = (offset % 32) >> 2; bitmap[byteIndex] |= (1 << bitInByte); } // allocate worst case size block of all slide info const unsigned entry_size = 4096/(8*4); // 8 bits per byte, possible pointer every 4 bytes. const unsigned toc_count = (unsigned)bitmapSize/entry_size; dyld_cache_slide_info* slideInfo = (dyld_cache_slide_info*)((uint8_t*)_buffer + _slideInfoFileOffset); slideInfo->version = 1; slideInfo->toc_offset = sizeof(dyld_cache_slide_info); slideInfo->toc_count = toc_count; slideInfo->entries_offset = (slideInfo->toc_offset+2*toc_count+127)&(-128); slideInfo->entries_count = 0; slideInfo->entries_size = entry_size; // append each unique entry const dyldCacheSlideInfoEntry* bitmapAsEntries = (dyldCacheSlideInfoEntry*)bitmap; dyldCacheSlideInfoEntry* const entriesInSlidInfo = (dyldCacheSlideInfoEntry*)((char*)slideInfo+slideInfo->entries_offset()); int entry_count = 0; for (int i=0; i < toc_count; ++i) { const dyldCacheSlideInfoEntry* thisEntry = &bitmapAsEntries[i]; // see if it is same as one already added bool found = false; for (int j=0; j < entry_count; ++j) { if ( memcmp(thisEntry, &entriesInSlidInfo[j], entry_size) == 0 ) { slideInfo->set_toc(i, j); found = true; break; } } if ( !found ) { // append to end memcpy(&entriesInSlidInfo[entry_count], thisEntry, entry_size); slideInfo->set_toc(i, entry_count++); } } slideInfo->entries_count = entry_count; ::free((void*)bitmap); _buffer.header->slideInfoSize = align(slideInfo->entries_offset + entry_count*entry_size, _archLayout->sharedRegionAlignP2); } */ void SharedCacheBuilder::setPointerContentV3(dyld3::MachOLoaded::ChainedFixupPointerOnDisk* loc, uint64_t targetVMAddr, size_t next) { assert(targetVMAddr > _readExecuteRegion.unslidLoadAddress); assert(targetVMAddr < _readOnlyRegion.unslidLoadAddress+_readOnlyRegion.sizeInUse); dyld3::MachOLoaded::ChainedFixupPointerOnDisk tmp; uint16_t diversity; bool hasAddrDiv; uint8_t key; if ( _aslrTracker.hasAuthData(loc, &diversity, &hasAddrDiv, &key) ) { // if base cache address cannot fit into target, then use offset tmp.arm64e.authRebase.target = _readExecuteRegion.unslidLoadAddress; if ( tmp.arm64e.authRebase.target != _readExecuteRegion.unslidLoadAddress ) targetVMAddr -= _readExecuteRegion.unslidLoadAddress; loc->arm64e.authRebase.target = targetVMAddr; loc->arm64e.authRebase.diversity = diversity; loc->arm64e.authRebase.addrDiv = hasAddrDiv; loc->arm64e.authRebase.key = key; loc->arm64e.authRebase.next = next; loc->arm64e.authRebase.bind = 0; loc->arm64e.authRebase.auth = 1; assert(loc->arm64e.authRebase.target == targetVMAddr && "target truncated"); assert(loc->arm64e.authRebase.next == next && "next location truncated"); } else { uint8_t highByte = 0; _aslrTracker.hasHigh8(loc, &highByte); // if base cache address cannot fit into target, then use offset tmp.arm64e.rebase.target = _readExecuteRegion.unslidLoadAddress; if ( tmp.arm64e.rebase.target != _readExecuteRegion.unslidLoadAddress ) targetVMAddr -= _readExecuteRegion.unslidLoadAddress; loc->arm64e.rebase.target = targetVMAddr; loc->arm64e.rebase.high8 = highByte; loc->arm64e.rebase.next = next; loc->arm64e.rebase.bind = 0; loc->arm64e.rebase.auth = 0; assert(loc->arm64e.rebase.target == targetVMAddr && "target truncated"); assert(loc->arm64e.rebase.next == next && "next location truncated"); } } uint16_t SharedCacheBuilder::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 ) { // convert vmaddr based pointers to arm64e dyld cache chains setPointerContentV3(lastLoc, lastLoc->raw64, loc - lastLoc); } lastLoc = loc; } } if ( lastLoc != nullptr ) { // convert vmaddr based pointers to arm64e dyld cache chain, and mark end of chain setPointerContentV3(lastLoc, lastLoc->raw64, 0); } return result; } void SharedCacheBuilder::writeSlideInfoV3(const bool bitmapForAllDataRegions[], unsigned dataPageCountForAllDataRegions) { const uint32_t pageSize = _aslrTracker.pageSize(); const uint8_t* firstDataRegionBuffer = firstDataRegion()->buffer; for (uint32_t dataRegionIndex = 0; dataRegionIndex != _dataRegions.size(); ++dataRegionIndex) { Region& dataRegion = _dataRegions[dataRegionIndex]; // fprintf(stderr, "writeSlideInfoV3: %s 0x%llx->0x%llx\n", dataRegion.name.c_str(), dataRegion.cacheFileOffset, dataRegion.cacheFileOffset + dataRegion.sizeInUse); // fill in fixed info assert(dataRegion.slideInfoFileOffset != 0); assert((dataRegion.sizeInUse % pageSize) == 0); unsigned dataPageCount = (uint32_t)dataRegion.sizeInUse / pageSize; dyld_cache_slide_info3* info = (dyld_cache_slide_info3*)dataRegion.slideInfoBuffer; info->version = 3; info->page_size = pageSize; info->page_starts_count = dataPageCount; info->auth_value_add = _archLayout->sharedMemoryStart; // fill in per-page starts const size_t bitmapEntriesPerPage = (sizeof(bool)*(pageSize/4)); uint8_t* pageContent = dataRegion.buffer; unsigned numPagesFromFirstDataRegion = (uint32_t)(dataRegion.buffer - firstDataRegionBuffer) / pageSize; assert((numPagesFromFirstDataRegion + dataPageCount) <= dataPageCountForAllDataRegions); const bool* bitmapForRegion = (const bool*)bitmapForAllDataRegions + (bitmapEntriesPerPage * numPagesFromFirstDataRegion); const bool* bitmapForPage = bitmapForRegion; //for (unsigned i=0; i < dataPageCount; ++i) { dispatch_apply(dataPageCount, DISPATCH_APPLY_AUTO, ^(size_t i) { info->page_starts[i] = pageStartV3(pageContent + (i * pageSize), pageSize, bitmapForPage + (i * bitmapEntriesPerPage)); }); // update region with final size dataRegion.slideInfoFileSize = align(__offsetof(dyld_cache_slide_info3, page_starts[dataPageCount]), _archLayout->sharedRegionAlignP2); if ( dataRegion.slideInfoFileSize > dataRegion.slideInfoBufferSizeAllocated ) { _diagnostics.error("kernel slide info overflow buffer"); } // Update the mapping entry on the cache header const dyld_cache_header* cacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer; dyld_cache_mapping_and_slide_info* slidableMappings = (dyld_cache_mapping_and_slide_info*)(_readExecuteRegion.buffer + cacheHeader->mappingWithSlideOffset); slidableMappings[1 + dataRegionIndex].slideInfoFileSize = dataRegion.slideInfoFileSize; } } |