#include <unistd.h>
#include <dirent.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
#include <mach/mach_vm.h>
#include <mach-o/loader.h>
#include <mach-o/fat.h>
#include <mach/shared_region.h>
#include <assert.h>
#include <CommonCrypto/CommonHMAC.h>
#include <CommonCrypto/CommonDigest.h>
#include <CommonCrypto/CommonDigestSPI.h>
#include <pthread/pthread.h>
#include <apfs/apfs_fsctl.h>
#include <string>
#include <vector>
#include <unordered_map>
#include <unordered_set>
#include "MachOFileAbstraction.hpp"
#include "CodeSigningTypes.h"
#include "DyldSharedCache.h"
#include "CacheBuilder.h"
#include "FileAbstraction.hpp"
#include "Trie.hpp"
#include "FileUtils.h"
#include "Diagnostics.h"
#include "ClosureBuilder.h"
#include "Closure.h"
#include "ClosureFileSystemNull.h"
#include "StringUtils.h"
#if __has_include("dyld_cache_config.h")
#include "dyld_cache_config.h"
#else
#define ARM_SHARED_REGION_START 0x1A000000ULL
#define ARM_SHARED_REGION_SIZE 0x26000000ULL
#define ARM64_SHARED_REGION_START 0x180000000ULL
#define ARM64_SHARED_REGION_SIZE 0x100000000ULL
#endif
#ifndef ARM64_32_SHARED_REGION_START
#define ARM64_32_SHARED_REGION_START 0x1A000000ULL
#define ARM64_32_SHARED_REGION_SIZE 0x26000000ULL
#endif
#if ARM_SHARED_REGION_SIZE > 0x26000000ULL
#define ARMV7K_CHAIN_BITS 0xC0000000
#define ARMV7K_MAX 0x0
#else
#define ARMV7K_CHAIN_BITS 0xE0000000
#define ARMV7K_MAX 0x20000000
#endif
const CacheBuilder::ArchLayout CacheBuilder::_s_archLayout[] = {
{ 0x7FFF20000000ULL, 0xEFE00000ULL, 0x0, 0x40000000, 0x00FFFF0000000000, "x86_64", CS_PAGE_SIZE_4K, 12, 2, true, true, true },
{ 0x7FFF20000000ULL, 0xEFE00000ULL, 0x0, 0x40000000, 0x00FFFF0000000000, "x86_64h", CS_PAGE_SIZE_4K, 12, 2, true, true, true },
{ SHARED_REGION_BASE_I386, SHARED_REGION_SIZE_I386, 0x0, 0x00200000, 0x0, "i386", CS_PAGE_SIZE_4K, 12, 0, false, false, true },
{ ARM64_SHARED_REGION_START, ARM64_SHARED_REGION_SIZE, 0x0, 0x02000000, 0x00FFFF0000000000, "arm64", CS_PAGE_SIZE_4K, 14, 2, false, true, false },
#if SUPPORT_ARCH_arm64e
{ ARM64_SHARED_REGION_START, ARM64_SHARED_REGION_SIZE, 0x0, 0x02000000, 0x00FFFF0000000000, "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,0x0, 0x02000000, 0xC0000000, "arm64_32", CS_PAGE_SIZE_16K, 14, 6, false, false, true },
#endif
{ ARM_SHARED_REGION_START, ARM_SHARED_REGION_SIZE, 0x0, 0x02000000, 0xE0000000, "armv7s", CS_PAGE_SIZE_4K, 14, 4, false, false, true },
{ ARM_SHARED_REGION_START, ARM_SHARED_REGION_SIZE, ARMV7K_MAX, 0x00400000, ARMV7K_CHAIN_BITS, "armv7k", CS_PAGE_SIZE_4K, 14, 4, false, false, true },
{ 0x40000000, 0x40000000, 0x0, 0x02000000, 0x0, "sim-x86", CS_PAGE_SIZE_4K, 14, 0, false, false, true }
};
const char* const CacheBuilder::_s_neverStubEliminateDylibs[] = {
"/usr/lib/system/libdispatch.dylib",
nullptr
};
const char* const CacheBuilder::_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_good_size",
"_malloc_make_nonpurgeable",
"_malloc_make_purgeable",
"_malloc_set_zone_name",
"_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",
"__ZdaPv",
"__ZdlPv",
"__Znam",
"__Znwm",
nullptr
};
CacheBuilder::CacheBuilder(const DyldSharedCache::CreateOptions& options, const dyld3::closure::FileSystem& fileSystem)
: _options(options)
, _fileSystem(fileSystem)
, _fullAllocatedBuffer(0)
, _diagnostics(options.loggingPrefix, options.verbose)
, _archLayout(nullptr)
, _aliasCount(0)
, _slideInfoFileOffset(0)
, _slideInfoBufferSizeAllocated(0)
, _allocatedBufferSize(0)
, _selectorStringsFromExecutables(0)
{
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;
break;
}
}
if (!_archLayout) {
_diagnostics.error("Tool was built without support for: '%s'", targetArch.c_str());
}
}
std::string CacheBuilder::errorMessage()
{
return _diagnostics.errorMessage();
}
const std::set<std::string> CacheBuilder::warnings()
{
return _diagnostics.warnings();
}
const std::set<const dyld3::MachOAnalyzer*> CacheBuilder::evictions()
{
return _evictions;
}
void CacheBuilder::deleteBuffer()
{
vm_deallocate(mach_task_self(), _fullAllocatedBuffer, _archLayout->sharedMemorySize);
_fullAllocatedBuffer = 0;
_allocatedBufferSize = 0;
if ( _localSymbolsRegion.bufferSize != 0 ) {
vm_deallocate(mach_task_self(), (vm_address_t)_localSymbolsRegion.buffer, _localSymbolsRegion.bufferSize);
_localSymbolsRegion.buffer = 0;
_localSymbolsRegion.bufferSize = 0;
}
vm_deallocate(mach_task_self(), (vm_address_t)_codeSignatureRegion.buffer, _codeSignatureRegion.bufferSize);
_codeSignatureRegion.buffer = 0;
_codeSignatureRegion.bufferSize = 0;
}
void CacheBuilder::makeSortedDylibs(const std::vector<LoadedMachO>& dylibs, const std::unordered_map<std::string, unsigned> sortOrder)
{
for (const LoadedMachO& dylib : dylibs) {
_sortedDylibs.push_back({ &dylib, dylib.mappedFile.runtimePath, {} });
}
std::sort(_sortedDylibs.begin(), _sortedDylibs.end(), [&](const DylibInfo& a, const DylibInfo& b) {
const auto& orderA = sortOrder.find(a.input->mappedFile.runtimePath);
const auto& orderB = sortOrder.find(b.input->mappedFile.runtimePath);
bool foundA = (orderA != sortOrder.end());
bool foundB = (orderB != sortOrder.end());
if ( foundA && foundB )
return orderA->second < orderB->second;
else if ( foundA )
return true;
else if ( foundB )
return false;
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;
return a.input->mappedFile.runtimePath < b.input->mappedFile.runtimePath;
});
}
inline uint32_t absolutetime_to_milliseconds(uint64_t abstime)
{
return (uint32_t)(abstime/1000/1000);
}
struct DylibAndSize
{
const CacheBuilder::LoadedMachO* input;
const char* installName;
uint64_t size;
};
uint64_t CacheBuilder::cacheOverflowAmount()
{
if ( _archLayout->sharedRegionsAreDiscontiguous ) {
if ( _readExecuteRegion.sizeInUse > 0x60000000 )
return (_readExecuteRegion.sizeInUse - 0x60000000);
if ( _readWriteRegion.sizeInUse > 0x40000000 )
return (_readWriteRegion.sizeInUse - 0x40000000);
if ( _readOnlyRegion.sizeInUse > 0x3FE00000 )
return (_readOnlyRegion.sizeInUse - 0x3FE00000);
}
else if ( _archLayout->textAndDataMaxSize != 0 ) {
uint64_t totalTextAndData = _readWriteRegion.unslidLoadAddress + _readWriteRegion.sizeInUse - _readExecuteRegion.unslidLoadAddress;
if ( totalTextAndData < _archLayout->textAndDataMaxSize )
return 0;
else
return totalTextAndData - _archLayout->textAndDataMaxSize;
}
else {
bool alreadyOptimized = (_readOnlyRegion.sizeInUse != _readOnlyRegion.bufferSize);
uint64_t vmSize = _readOnlyRegion.unslidLoadAddress - _readExecuteRegion.unslidLoadAddress;
if ( alreadyOptimized )
vmSize += _readOnlyRegion.sizeInUse;
else if ( _options.excludeLocalSymbols )
vmSize += (_readOnlyRegion.sizeInUse * 37/100); else
vmSize += (_readOnlyRegion.sizeInUse * 80/100); if ( vmSize > _archLayout->sharedMemorySize )
return vmSize - _archLayout->sharedMemorySize;
}
return 0;
}
size_t CacheBuilder::evictLeafDylibs(uint64_t reductionTarget, std::vector<const LoadedMachO*>& overflowDylibs)
{
__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) {
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());
});
}
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 });
}
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 {
order = UINT64_MAX;
}
if (order > candidateOrder ||
(order == UINT64_MAX && candidate.size < dylib.size)) {
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);
}
}
}
for (DylibAndSize& dylib : sortedDylibs) {
if ( _options.verbose )
_diagnostics.warning("to prevent cache overflow, not caching %s", dylib.installName);
_evictions.insert(dylib.input->mappedFile.mh);
overflowDylibs.push_back(dylib.input);
if ( dylib.size > reductionTarget )
break;
reductionTarget -= dylib.size;
}
_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();
}
class CacheInputBuilder {
public:
CacheInputBuilder(const dyld3::closure::FileSystem& fileSystem,
const dyld3::GradedArchs& archs, dyld3::Platform reqPlatform)
: fileSystem(fileSystem), reqArchs(archs), reqPlatform(reqPlatform) { }
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);
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);
if (ma->isDylib()) {
std::string installName = ma->installName();
if (platformExcludesInstallName(installName)) {
inputFile.diag.verbose("Platform excluded file\n");
fileSystem.unloadFile(loadedFileInfo);
continue;
}
if (!ma->canBePlacedInDyldCache(inputFile.path, ^(const char* msg) {
inputFile.diag.warning("Dylib located at '%s' cannot be placed in cache because: %s", inputFile.path, msg);
})) {
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;
}
auto iteratorAndInserted = dylibInstallNameMap.insert(std::make_pair(installName, dylibsToCache.size()));
if (iteratorAndInserted.second) {
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 {
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());
if (inputFile.path == installName) {
fileSystem.unloadFile(previousLoadedMachO.loadedFileInfo);
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()) {
if (platformExcludesExecutablePath_macOS(inputFile.path)) {
inputFile.diag.verbose("Platform excluded file\n");
fileSystem.unloadFile(loadedFileInfo);
continue;
}
executables.emplace_back((CacheBuilder::LoadedMachO){ mappedFile, loadedFileInfo, &inputFile });
} else {
inputFile.diag.verbose("Unsupported mach file type\n");
fileSystem.unloadFile(loadedFileInfo);
}
}
}
private:
static bool platformExcludesInstallName_macOS(const std::string& installName) {
return false;
}
static bool platformExcludesInstallName_iOS(const std::string& installName) {
if ( installName == "/System/Library/Caches/com.apple.xpc/sdk.dylib" )
return true;
if ( installName == "/System/Library/Caches/com.apple.xpcd/xpcd_cache.dylib" )
return true;
return false;
}
static bool platformExcludesInstallName_tvOS(const std::string& installName) {
return platformExcludesInstallName_iOS(installName);
}
static bool platformExcludesInstallName_watchOS(const std::string& installName) {
return platformExcludesInstallName_iOS(installName);
}
static bool platformExcludesInstallName_bridgeOS(const std::string& installName) {
return platformExcludesInstallName_iOS(installName);
}
bool platformExcludesInstallName(const std::string& installName) {
switch (reqPlatform) {
case dyld3::Platform::unknown:
return false;
case dyld3::Platform::macOS:
return platformExcludesInstallName_macOS(installName);
case dyld3::Platform::iOS:
return platformExcludesInstallName_iOS(installName);
case dyld3::Platform::tvOS:
return platformExcludesInstallName_tvOS(installName);
case dyld3::Platform::watchOS:
return platformExcludesInstallName_watchOS(installName);
case dyld3::Platform::bridgeOS:
return platformExcludesInstallName_bridgeOS(installName);
case dyld3::Platform::iOSMac:
return false;
case dyld3::Platform::iOS_simulator:
return false;
case dyld3::Platform::tvOS_simulator:
return false;
case dyld3::Platform::watchOS_simulator:
return false;
case dyld3::Platform::driverKit:
return false;
}
}
static bool platformExcludesExecutablePath_macOS(const std::string& path) {
return false;
}
static bool platformExcludesExecutablePath_iOS(const std::string& path) {
if (path == "/sbin/launchd"
|| path == "/usr/local/sbin/launchd.debug"
|| path == "/usr/local/sbin/launchd.development"
|| path == "/usr/libexec/installd") {
return true;
}
return false;
}
static bool platformExcludesExecutablePath_tvOS(const std::string& path) {
return platformExcludesExecutablePath_iOS(path);
}
static bool platformExcludesExecutablePath_watchOS(const std::string& path) {
return platformExcludesExecutablePath_iOS(path);
}
static bool platformExcludesExecutablePath_bridgeOS(const std::string& path) {
return platformExcludesExecutablePath_iOS(path);
}
bool platformExcludesExecutablePath(const std::string& path) {
switch (reqPlatform) {
case dyld3::Platform::unknown:
return false;
case dyld3::Platform::macOS:
return platformExcludesExecutablePath_macOS(path);
case dyld3::Platform::iOS:
return platformExcludesExecutablePath_iOS(path);
case dyld3::Platform::tvOS:
return platformExcludesExecutablePath_tvOS(path);
case dyld3::Platform::watchOS:
return platformExcludesExecutablePath_watchOS(path);
case dyld3::Platform::bridgeOS:
return platformExcludesExecutablePath_bridgeOS(path);
case dyld3::Platform::iOSMac:
return false;
case dyld3::Platform::iOS_simulator:
return false;
case dyld3::Platform::tvOS_simulator:
return false;
case dyld3::Platform::watchOS_simulator:
return false;
case dyld3::Platform::driverKit:
return false;
}
}
const dyld3::closure::FileSystem& fileSystem;
const dyld3::GradedArchs& reqArchs;
dyld3::Platform reqPlatform;
};
static void verifySelfContained(std::vector<CacheBuilder::LoadedMachO>& dylibsToCache,
std::vector<CacheBuilder::LoadedMachO>& otherDylibs,
std::vector<CacheBuilder::LoadedMachO>& couldNotLoadFiles)
{
__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 });
}
__block std::map<std::string, std::set<std::string>> badDylibs;
__block bool doAgain = true;
while ( doAgain ) {
doAgain = false;
for (const CacheBuilder::LoadedMachO& dylib : dylibsToCache) {
if ( badDylibs.count(dylib.mappedFile.runtimePath) != 0 )
continue;
dylib.mappedFile.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
if (isWeak)
return;
if ( knownDylibs.count(loadPath) == 0 ) {
badDylibs[dylib.mappedFile.runtimePath].insert(std::string("Could not find dependency '") + loadPath + "'");
knownDylibs.erase(dylib.mappedFile.runtimePath);
knownDylibs.erase(dylib.mappedFile.mh->installName());
doAgain = true;
}
});
}
}
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;
__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);
}
}
});
}
}
const bool evictLeafDylibs = true;
if (evictLeafDylibs) {
doAgain = true;
while ( doAgain ) {
doAgain = false;
__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);
});
}
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;
}
}
}
}
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());
}
void CacheBuilder::build(std::vector<CacheBuilder::InputFile>& inputFiles,
std::vector<DyldSharedCache::FileAlias>& aliases) {
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(dylibsToCache, otherDylibs, couldNotLoadFiles);
if (!_diagnostics.hasError()) {
std::string errorString;
for (const LoadedMachO& dylib : otherDylibs) {
if (dylib.inputFile->mustBeIncluded()) {
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()) {
std::string errorString;
for (CacheBuilder::InputFile& inputFile : inputFiles) {
if (inputFile.mustBeIncluded() && inputFile.diag.hasError()) {
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());
}
}
for (CacheBuilder::InputFile& inputFile : inputFiles) {
for (const std::string& warning : inputFile.diag.warnings())
_diagnostics.warning("%s", warning.c_str());
}
for (LoadedMachO& loadedMachO : dylibsToCache)
_fileSystem.unloadFile(loadedMachO.loadedFileInfo);
for (LoadedMachO& loadedMachO : otherDylibs)
_fileSystem.unloadFile(loadedMachO.loadedFileInfo);
for (LoadedMachO& loadedMachO : executables)
_fileSystem.unloadFile(loadedMachO.loadedFileInfo);
}
void CacheBuilder::build(const std::vector<DyldSharedCache::MappedMachO>& dylibs,
const std::vector<DyldSharedCache::MappedMachO>& otherOsDylibsInput,
const std::vector<DyldSharedCache::MappedMachO>& osExecutables,
std::vector<DyldSharedCache::FileAlias>& aliases) {
std::vector<LoadedMachO> dylibsToCache;
std::vector<LoadedMachO> otherDylibs;
std::vector<LoadedMachO> executables;
for (const DyldSharedCache::MappedMachO& mappedMachO : dylibs) {
dyld3::closure::LoadedFileInfo loadedFileInfo;
loadedFileInfo.fileContent = mappedMachO.mh;
loadedFileInfo.fileContentLen = mappedMachO.length;
loadedFileInfo.sliceOffset = mappedMachO.sliceFileOffset;
loadedFileInfo.sliceLen = mappedMachO.length;
loadedFileInfo.inode = mappedMachO.inode;
loadedFileInfo.mtime = mappedMachO.modTime;
loadedFileInfo.path = mappedMachO.runtimePath.c_str();
dylibsToCache.emplace_back((LoadedMachO){ mappedMachO, loadedFileInfo, nullptr });
}
for (const DyldSharedCache::MappedMachO& mappedMachO : otherOsDylibsInput) {
dyld3::closure::LoadedFileInfo loadedFileInfo;
loadedFileInfo.fileContent = mappedMachO.mh;
loadedFileInfo.fileContentLen = mappedMachO.length;
loadedFileInfo.sliceOffset = mappedMachO.sliceFileOffset;
loadedFileInfo.sliceLen = mappedMachO.length;
loadedFileInfo.inode = mappedMachO.inode;
loadedFileInfo.mtime = mappedMachO.modTime;
loadedFileInfo.path = mappedMachO.runtimePath.c_str();
otherDylibs.emplace_back((LoadedMachO){ mappedMachO, loadedFileInfo, nullptr });
}
for (const DyldSharedCache::MappedMachO& mappedMachO : osExecutables) {
dyld3::closure::LoadedFileInfo loadedFileInfo;
loadedFileInfo.fileContent = mappedMachO.mh;
loadedFileInfo.fileContentLen = mappedMachO.length;
loadedFileInfo.sliceOffset = mappedMachO.sliceFileOffset;
loadedFileInfo.sliceLen = mappedMachO.length;
loadedFileInfo.inode = mappedMachO.inode;
loadedFileInfo.mtime = mappedMachO.modTime;
loadedFileInfo.path = mappedMachO.runtimePath.c_str();
executables.emplace_back((LoadedMachO){ mappedMachO, loadedFileInfo, nullptr });
}
build(dylibsToCache, otherDylibs, executables, aliases);
}
void CacheBuilder::build(const std::vector<LoadedMachO>& dylibs,
const std::vector<LoadedMachO>& otherOsDylibsInput,
const std::vector<LoadedMachO>& osExecutables,
std::vector<DyldSharedCache::FileAlias>& aliases)
{
if ( dylibs.size() < 30 ) {
_diagnostics.error("missing required minimum set of dylibs");
return;
}
uint64_t t1 = mach_absolute_time();
makeSortedDylibs(dylibs, _options.dylibOrdering);
_allocatedBufferSize = _archLayout->sharedMemorySize * 1.50;
if ( vm_allocate(mach_task_self(), &_fullAllocatedBuffer, _allocatedBufferSize, VM_FLAGS_ANYWHERE) != 0 ) {
_diagnostics.error("could not allocate buffer");
return;
}
parseCoalescableSegments();
processSelectorStrings(osExecutables);
assignSegmentAddresses();
std::vector<const LoadedMachO*> overflowDylibs;
while ( cacheOverflowAmount() != 0 ) {
if ( !_options.evictLeafDylibsOnOverflow ) {
_diagnostics.error("cache overflow by %lluMB", cacheOverflowAmount() / 1024 / 1024);
return;
}
size_t evictionCount = evictLeafDylibs(cacheOverflowAmount(), overflowDylibs);
for (DylibInfo& dylib : _sortedDylibs)
dylib.cacheLocation.clear();
_coalescedText.clear();
parseCoalescableSegments();
processSelectorStrings(osExecutables);
assignSegmentAddresses();
_diagnostics.verbose("cache overflow, evicted %lu leaf dylibs\n", evictionCount);
}
markPaddingInaccessible();
uint64_t t2 = mach_absolute_time();
writeCacheHeader();
copyRawSegments();
uint64_t t3 = mach_absolute_time();
_aslrTracker.setDataRegion(_readWriteRegion.buffer, _readWriteRegion.sizeInUse);
if ( !_options.cacheSupportsASLR )
_aslrTracker.disable();
adjustAllImagesForNewSegmentLocations();
if ( _diagnostics.hasError() )
return;
uint64_t t4 = mach_absolute_time();
buildImageArray(aliases);
if ( _diagnostics.hasError() )
return;
uint64_t t5 = mach_absolute_time();
DyldSharedCache* dyldCache = (DyldSharedCache*)_readExecuteRegion.buffer;
if ( _options.optimizeObjC )
optimizeObjC();
if ( _diagnostics.hasError() )
return;
uint64_t t6 = mach_absolute_time();
if ( _options.optimizeStubs )
optimizeAwayStubs();
fipsSign();
uint64_t t7 = mach_absolute_time();
optimizeLinkedit();
addImageArray();
if ( _diagnostics.hasError() )
return;
uint64_t t8 = mach_absolute_time();
if ( !dyld3::MachOFile::isSimulatorPlatform(_options.platform) ) {
addOtherImageArray(otherOsDylibsInput, overflowDylibs);
if ( _diagnostics.hasError() )
return;
addClosures(osExecutables);
if ( _diagnostics.hasError() )
return;
}
dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(_readExecuteRegion.buffer + dyldCache->header.mappingOffset);
mappings[2].size = _readOnlyRegion.sizeInUse;
if ( _options.excludeLocalSymbols )
dyldCache->header.localSymbolsOffset = _readOnlyRegion.cacheFileOffset + _readOnlyRegion.sizeInUse;
if ( _archLayout->sharedRegionsAreDiscontiguous ) {
uint64_t maxSlide0 = 0x60000000 - _readExecuteRegion.sizeInUse; uint64_t maxSlide1 = 0x40000000 - _readWriteRegion.sizeInUse;
uint64_t maxSlide2 = 0x3FE00000 - _readOnlyRegion.sizeInUse;
dyldCache->header.maxSlide = std::min(std::min(maxSlide0, maxSlide1), maxSlide2);
}
else {
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);
}
uint64_t t9 = mach_absolute_time();
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());
}
uint64_t t10 = mach_absolute_time();
if ( cacheOverflowAmount() != 0 ) {
_diagnostics.error("cache overflow after optimizations 0x%llX -> 0x%llX", _readExecuteRegion.unslidLoadAddress, _readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse);
return;
}
codeSign();
if ( _diagnostics.hasError() )
return;
uint64_t t11 = mach_absolute_time();
if ( _options.verbose ) {
fprintf(stderr, "time to layout cache: %ums\n", absolutetime_to_milliseconds(t2-t1));
fprintf(stderr, "time to copy cached dylibs into buffer: %ums\n", absolutetime_to_milliseconds(t3-t2));
fprintf(stderr, "time to adjust segments for new split locations: %ums\n", absolutetime_to_milliseconds(t4-t3));
fprintf(stderr, "time to bind all images: %ums\n", absolutetime_to_milliseconds(t5-t4));
fprintf(stderr, "time to optimize Objective-C: %ums\n", absolutetime_to_milliseconds(t6-t5));
fprintf(stderr, "time to do stub elimination: %ums\n", absolutetime_to_milliseconds(t7-t6));
fprintf(stderr, "time to optimize LINKEDITs: %ums\n", absolutetime_to_milliseconds(t8-t7));
fprintf(stderr, "time to build %lu closures: %ums\n", osExecutables.size(), absolutetime_to_milliseconds(t9-t8));
fprintf(stderr, "time to compute slide info: %ums\n", absolutetime_to_milliseconds(t10-t9));
fprintf(stderr, "time to compute UUID and codesign cache file: %ums\n", absolutetime_to_milliseconds(t11-t10));
}
return;
}
void CacheBuilder::writeCacheHeader()
{
std::string magic = "dyld_v1";
magic.append(15 - magic.length() - strlen(_options.archs->name()), ' ');
magic.append(_options.archs->name());
assert(magic.length() == 15);
dyld_cache_header* dyldCacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer;
memcpy(dyldCacheHeader->magic, magic.c_str(), 16);
dyldCacheHeader->mappingOffset = sizeof(dyld_cache_header);
dyldCacheHeader->mappingCount = 3;
dyldCacheHeader->imagesOffset = (uint32_t)(dyldCacheHeader->mappingOffset + 3*sizeof(dyld_cache_mapping_info));
dyldCacheHeader->imagesCount = (uint32_t)_sortedDylibs.size() + _aliasCount;
dyldCacheHeader->dyldBaseAddress = 0;
dyldCacheHeader->codeSignatureOffset = 0;
dyldCacheHeader->codeSignatureSize = 0;
dyldCacheHeader->slideInfoOffset = _slideInfoFileOffset;
dyldCacheHeader->slideInfoSize = _slideInfoBufferSizeAllocated;
dyldCacheHeader->localSymbolsOffset = 0;
dyldCacheHeader->localSymbolsSize = 0;
dyldCacheHeader->cacheType = _options.optimizeStubs ? kDyldSharedCacheTypeProduction : kDyldSharedCacheTypeDevelopment;
dyldCacheHeader->accelerateInfoAddr = 0;
dyldCacheHeader->accelerateInfoSize = 0;
bzero(dyldCacheHeader->uuid, 16); 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= (strcmp(_options.archs->name(), "arm64e") == 0); dyldCacheHeader->formatVersion = dyld3::closure::kFormatVersion;
dyldCacheHeader->sharedRegionStart = _archLayout->sharedMemoryStart;
dyldCacheHeader->sharedRegionSize = _archLayout->sharedMemorySize;
dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(_readExecuteRegion.buffer + dyldCacheHeader->mappingOffset);
mappings[0].address = _readExecuteRegion.unslidLoadAddress;
mappings[0].fileOffset = 0;
mappings[0].size = _readExecuteRegion.sizeInUse;
mappings[0].maxProt = VM_PROT_READ | VM_PROT_EXECUTE;
mappings[0].initProt = VM_PROT_READ | VM_PROT_EXECUTE;
mappings[1].address = _readWriteRegion.unslidLoadAddress;
mappings[1].fileOffset = _readExecuteRegion.sizeInUse;
mappings[1].size = _readWriteRegion.sizeInUse;
mappings[1].maxProt = VM_PROT_READ | VM_PROT_WRITE;
mappings[1].initProt = VM_PROT_READ | VM_PROT_WRITE;
mappings[2].address = _readOnlyRegion.unslidLoadAddress;
mappings[2].fileOffset = _readExecuteRegion.sizeInUse + _readWriteRegion.sizeInUse;
mappings[2].size = _readOnlyRegion.sizeInUse;
mappings[2].maxProt = VM_PROT_READ;
mappings[2].initProt = VM_PROT_READ;
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;
}
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());
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;
}
const dyld_cache_image_info* firstImage = (dyld_cache_image_info*)(_readExecuteRegion.buffer + dyldCacheHeader->imagesOffset);
assert(stringOffset <= (firstImage->address - mappings[0].address));
}
void CacheBuilder::copyRawSegments()
{
const bool log = false;
dispatch_apply(_sortedDylibs.size(), DISPATCH_APPLY_AUTO, ^(size_t index) {
const DylibInfo& dylib = _sortedDylibs[index];
for (const SegmentMappingInfo& info : dylib.cacheLocation) {
if (log) fprintf(stderr, "copy %s segment %s (0x%08X bytes) from %p to %p (logical addr 0x%llX) for %s\n",
_options.archs->name(), info.segName, info.copySegmentSize, info.srcSegment, info.dstSegment, info.dstCacheUnslidAddress, dylib.input->mappedFile.runtimePath.c_str());
::memcpy(info.dstSegment, info.srcSegment, info.copySegmentSize);
}
});
const uint64_t numCoalescedSections = sizeof(CacheCoalescedText::SupportedSections) / sizeof(*CacheCoalescedText::SupportedSections);
dispatch_apply(numCoalescedSections, DISPATCH_APPLY_AUTO, ^(size_t index) {
const CacheCoalescedText::StringSection& cacheStringSection = _coalescedText.getSectionData(CacheCoalescedText::SupportedSections[index]);
if (log) fprintf(stderr, "copy %s __TEXT_COAL section %s (0x%08X bytes) to %p (logical addr 0x%llX)\n",
_options.archs->name(), CacheCoalescedText::SupportedSections[index],
cacheStringSection.bufferSize, cacheStringSection.bufferAddr, cacheStringSection.bufferVMAddr);
for (const auto& stringAndOffset : cacheStringSection.stringsToOffsets)
::memcpy(cacheStringSection.bufferAddr + stringAndOffset.second, stringAndOffset.first.data(), stringAndOffset.first.size() + 1);
});
}
void CacheBuilder::adjustAllImagesForNewSegmentLocations()
{
__block std::vector<Diagnostics> diags;
diags.resize(_sortedDylibs.size());
if (_options.platform == dyld3::Platform::macOS) {
dispatch_apply(_sortedDylibs.size(), DISPATCH_APPLY_AUTO, ^(size_t index) {
const DylibInfo& dylib = _sortedDylibs[index];
adjustDylibSegments(dylib, diags[index]);
});
} else {
for (size_t index = 0; index != _sortedDylibs.size(); ++index) {
const DylibInfo& dylib = _sortedDylibs[index];
adjustDylibSegments(dylib, diags[index]);
}
}
for (const Diagnostics& diag : diags) {
if ( diag.hasError() ) {
_diagnostics.error("%s", diag.errorMessage().c_str());
break;
}
}
}
void CacheBuilder::processSelectorStrings(const std::vector<LoadedMachO>& executables) {
const bool log = false;
_selectorStringsFromExecutables = 0;
if (_options.platform == dyld3::Platform::watchOS)
return;
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;
auto itAndInserted = cacheStringSection.stringsToOffsets.insert({ str, cacheStringSection.bufferSize });
if (itAndInserted.second) {
cacheStringSection.bufferSize += str.size() + 1;
++_selectorStringsFromExecutables;
}
});
uint64_t sizeAfterProcessing = cacheStringSection.bufferSize;
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 from executables\n", _selectorStringsFromExecutables);
}
void CacheBuilder::parseCoalescableSegments() {
const bool log = false;
for (DylibInfo& dylib : _sortedDylibs)
_coalescedText.parseCoalescableText(dylib.input->mappedFile.mh, dylib.textCoalescer);
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);
}
}
}
void CacheBuilder::assignSegmentAddresses()
{
size_t startOffset = sizeof(dyld_cache_header) + 3*sizeof(dyld_cache_mapping_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);
}
startOffset = align(startOffset, 12);
_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; 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;
__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(sectInfo.sectName)) {
foundCoalescedSection = true;
} else {
sizeOfSections = sectInfo.sectAddr + sectInfo.sectSize - segInfo.vmAddr;
}
});
if (!foundCoalescedSection)
sizeOfSections = segInfo.sizeOfSections;
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;
});
}
if ( _archLayout->textAndDataMaxSize != 0 ) {
for (DylibInfo& dylib : _sortedDylibs) {
__block uint64_t textSegVmAddr = 0;
dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
if ( strcmp(segInfo.segName, "__TEXT") == 0 )
textSegVmAddr = segInfo.vmAddr;
if ( segInfo.protections != VM_PROT_READ )
return;
if ( strcmp(segInfo.segName, "__LINKEDIT") == 0 )
return;
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)(_readExecuteRegion.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;
});
}
}
uint64_t objcReadOnlyBufferVMAddr = addr;
_objcReadOnlyBuffer = _readExecuteRegion.buffer + (addr - _readExecuteRegion.unslidLoadAddress);
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;
}
uint32_t coalescedSelectorCount = (uint32_t)_coalescedText.objcMethNames.stringsToOffsets.size();
if ( coalescedSelectorCount > totalSelectorRefCount )
totalSelectorRefCount = coalescedSelectorCount;
addr += align(computeReadOnlyObjC(totalSelectorRefCount, totalClassDefCount, totalProtocolDefCount), 14);
_objcReadOnlyBufferSizeAllocated = addr - objcReadOnlyBufferVMAddr;
uint64_t endTextAddress = align(addr, _archLayout->sharedRegionAlignP2);
_readExecuteRegion.bufferSize = endTextAddress - _readExecuteRegion.unslidLoadAddress;
_readExecuteRegion.sizeInUse = _readExecuteRegion.bufferSize;
if ( _archLayout->sharedRegionsAreDiscontiguous )
addr = _archLayout->sharedMemoryStart + 0x60000000;
else
addr = align((addr + _archLayout->sharedRegionPadding), _archLayout->sharedRegionAlignP2);
_readWriteRegion.buffer = (uint8_t*)_fullAllocatedBuffer + addr - _archLayout->sharedMemoryStart;
_readWriteRegion.bufferSize = 0;
_readWriteRegion.sizeInUse = 0;
_readWriteRegion.unslidLoadAddress = addr;
_readWriteRegion.cacheFileOffset = _readExecuteRegion.sizeInUse;
__block int dataConstSegmentCount = 0;
for (DylibInfo& dylib : _sortedDylibs) {
__block uint64_t textSegVmAddr = 0;
dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
if ( _options.platform == dyld3::Platform::watchOS_simulator)
return;
if ( strcmp(segInfo.segName, "__TEXT") == 0 )
textSegVmAddr = segInfo.vmAddr;
if ( segInfo.protections != (VM_PROT_READ | VM_PROT_WRITE) )
return;
if ( strcmp(segInfo.segName, "__DATA_CONST") != 0 )
return;
++dataConstSegmentCount;
addr = align(addr, segInfo.p2align);
size_t copySize = std::min((size_t)segInfo.fileSize, (size_t)segInfo.sizeOfSections);
uint64_t offsetInRegion = addr - _readWriteRegion.unslidLoadAddress;
SegmentMappingInfo loc;
loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
loc.segName = segInfo.segName;
loc.dstSegment = _readWriteRegion.buffer + offsetInRegion;
loc.dstCacheUnslidAddress = addr;
loc.dstCacheFileOffset = (uint32_t)(_readWriteRegion.cacheFileOffset + offsetInRegion);
loc.dstCacheSegmentSize = (uint32_t)segInfo.sizeOfSections;
loc.dstCacheFileSize = (uint32_t)copySize;
loc.copySegmentSize = (uint32_t)copySize;
loc.srcSegmentIndex = segInfo.segIndex;
dylib.cacheLocation.push_back(loc);
addr += loc.dstCacheSegmentSize;
});
}
for (DylibInfo& dylib : _sortedDylibs) {
__block uint64_t textSegVmAddr = 0;
dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
if ( strcmp(segInfo.segName, "__TEXT") == 0 )
textSegVmAddr = segInfo.vmAddr;
if ( segInfo.protections != (VM_PROT_READ | VM_PROT_WRITE) )
return;
if ( _options.platform != dyld3::Platform::watchOS_simulator) {
if ( strcmp(segInfo.segName, "__DATA_CONST") == 0 )
return;
if ( strcmp(segInfo.segName, "__DATA_DIRTY") == 0 )
return;
}
bool forcePageAlignedData = false;
if (_options.platform == dyld3::Platform::macOS) {
forcePageAlignedData = dylib.input->mappedFile.mh->hasUnalignedPointerFixups();
}
if ( (dataConstSegmentCount > 10) && !forcePageAlignedData ) {
addr = align(addr, segInfo.p2align);
}
else {
addr = align(addr, std::max((int)segInfo.p2align, (int)12));
}
size_t copySize = std::min((size_t)segInfo.fileSize, (size_t)segInfo.sizeOfSections);
uint64_t offsetInRegion = addr - _readWriteRegion.unslidLoadAddress;
SegmentMappingInfo loc;
loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
loc.segName = segInfo.segName;
loc.dstSegment = _readWriteRegion.buffer + offsetInRegion;
loc.dstCacheUnslidAddress = addr;
loc.dstCacheFileOffset = (uint32_t)(_readWriteRegion.cacheFileOffset + offsetInRegion);
loc.dstCacheSegmentSize = (uint32_t)segInfo.sizeOfSections;
loc.dstCacheFileSize = (uint32_t)copySize;
loc.copySegmentSize = (uint32_t)copySize;
loc.srcSegmentIndex = segInfo.segIndex;
dylib.cacheLocation.push_back(loc);
addr += loc.dstCacheSegmentSize;
});
}
const size_t dylibCount = _sortedDylibs.size();
uint32_t dirtyDataSortIndexes[dylibCount];
for (size_t i=0; i < dylibCount; ++i)
dirtyDataSortIndexes[i] = (uint32_t)i;
std::sort(&dirtyDataSortIndexes[0], &dirtyDataSortIndexes[dylibCount], [&](const uint32_t& a, const uint32_t& b) {
const auto& orderA = _options.dirtyDataSegmentOrdering.find(_sortedDylibs[a].input->mappedFile.runtimePath);
const auto& orderB = _options.dirtyDataSegmentOrdering.find(_sortedDylibs[b].input->mappedFile.runtimePath);
bool foundA = (orderA != _options.dirtyDataSegmentOrdering.end());
bool foundB = (orderB != _options.dirtyDataSegmentOrdering.end());
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;
});
addr = align(addr, 12);
for (size_t i=0; i < dylibCount; ++i) {
DylibInfo& dylib = _sortedDylibs[dirtyDataSortIndexes[i]];
__block uint64_t textSegVmAddr = 0;
dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
if ( _options.platform == dyld3::Platform::watchOS_simulator)
return;
if ( strcmp(segInfo.segName, "__TEXT") == 0 )
textSegVmAddr = segInfo.vmAddr;
if ( segInfo.protections != (VM_PROT_READ | VM_PROT_WRITE) )
return;
if ( strcmp(segInfo.segName, "__DATA_DIRTY") != 0 )
return;
addr = align(addr, segInfo.p2align);
size_t copySize = std::min((size_t)segInfo.fileSize, (size_t)segInfo.sizeOfSections);
uint64_t offsetInRegion = addr - _readWriteRegion.unslidLoadAddress;
SegmentMappingInfo loc;
loc.srcSegment = (uint8_t*)dylib.input->mappedFile.mh + segInfo.vmAddr - textSegVmAddr;
loc.segName = segInfo.segName;
loc.dstSegment = _readWriteRegion.buffer + offsetInRegion;
loc.dstCacheUnslidAddress = addr;
loc.dstCacheFileOffset = (uint32_t)(_readWriteRegion.cacheFileOffset + offsetInRegion);
loc.dstCacheSegmentSize = (uint32_t)segInfo.sizeOfSections;
loc.dstCacheFileSize = (uint32_t)copySize;
loc.copySegmentSize = (uint32_t)copySize;
loc.srcSegmentIndex = segInfo.segIndex;
dylib.cacheLocation.push_back(loc);
addr += loc.dstCacheSegmentSize;
});
}
_objcReadWriteBufferSizeAllocated = align(computeReadWriteObjC((uint32_t)_sortedDylibs.size(), totalProtocolDefCount), 14);
addr = align(addr, 4); _objcReadWriteBuffer = _readWriteRegion.buffer + (addr - _readWriteRegion.unslidLoadAddress);
addr += _objcReadWriteBufferSizeAllocated;
uint64_t endDataAddress = align(addr, _archLayout->sharedRegionAlignP2);
_readWriteRegion.bufferSize = endDataAddress - _readWriteRegion.unslidLoadAddress;
_readWriteRegion.sizeInUse = _readWriteRegion.bufferSize;
if ( _archLayout->sharedRegionsAreDiscontiguous )
addr = _archLayout->sharedMemoryStart + 0xA0000000;
else
addr = align((addr + _archLayout->sharedRegionPadding), _archLayout->sharedRegionAlignP2);
_readOnlyRegion.buffer = (uint8_t*)_fullAllocatedBuffer + addr - _archLayout->sharedMemoryStart;
_readOnlyRegion.bufferSize = 0;
_readOnlyRegion.sizeInUse = 0;
_readOnlyRegion.unslidLoadAddress = addr;
_readOnlyRegion.cacheFileOffset = _readWriteRegion.cacheFileOffset + _readWriteRegion.sizeInUse;
if ( _options.cacheSupportsASLR ) {
size_t slideInfoSize = sizeof(dyld_cache_slide_info);
slideInfoSize = std::max(slideInfoSize, sizeof(dyld_cache_slide_info2));
slideInfoSize = std::max(slideInfoSize, sizeof(dyld_cache_slide_info3));
slideInfoSize = std::max(slideInfoSize, sizeof(dyld_cache_slide_info4));
_slideInfoBufferSizeAllocated = align(slideInfoSize + (_readWriteRegion.sizeInUse/4096) * _archLayout->slideInfoBytesPerPage, _archLayout->sharedRegionAlignP2);
_slideInfoFileOffset = _readOnlyRegion.cacheFileOffset;
addr += _slideInfoBufferSizeAllocated;
}
if ( _archLayout->textAndDataMaxSize == 0 ) {
for (DylibInfo& dylib : _sortedDylibs) {
__block uint64_t textSegVmAddr = 0;
dylib.input->mappedFile.mh->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& segInfo, bool& stop) {
if ( strcmp(segInfo.segName, "__TEXT") == 0 )
textSegVmAddr = segInfo.vmAddr;
if ( segInfo.protections != VM_PROT_READ )
return;
if ( strcmp(segInfo.segName, "__LINKEDIT") == 0 )
return;
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;
});
}
}
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;
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;
});
}
uint64_t endReadOnlyAddress = align(addr, _archLayout->sharedRegionAlignP2);
_readOnlyRegion.bufferSize = endReadOnlyAddress - _readOnlyRegion.unslidLoadAddress;
_readOnlyRegion.sizeInUse = _readOnlyRegion.bufferSize;
for (DylibInfo& dylib : _sortedDylibs) {
std::sort(dylib.cacheLocation.begin(), dylib.cacheLocation.end(), [&](const SegmentMappingInfo& a, const SegmentMappingInfo& b) {
return a.srcSegmentIndex < b.srcSegmentIndex;
});
}
}
void CacheBuilder::markPaddingInaccessible()
{
uint8_t* startPad1 = _readExecuteRegion.buffer+_readExecuteRegion.sizeInUse;
uint8_t* endPad1 = _readWriteRegion.buffer;
::vm_protect(mach_task_self(), (vm_address_t)startPad1, endPad1-startPad1, false, 0);
uint8_t* startPad2 = _readWriteRegion.buffer+_readWriteRegion.sizeInUse;
uint8_t* endPad2 = _readOnlyRegion.buffer;
::vm_protect(mach_task_self(), (vm_address_t)startPad2, endPad2-startPad2, false, 0);
}
uint64_t CacheBuilder::pathHash(const char* path)
{
uint64_t sum = 0;
for (const char* s=path; *s != '\0'; ++s)
sum += sum*4 + *s;
return sum;
}
void CacheBuilder::findDylibAndSegment(const void* contentPtr, std::string& foundDylibName, std::string& foundSegName)
{
foundDylibName = "???";
foundSegName = "???";
uint64_t unslidVmAddr = ((uint8_t*)contentPtr - _readExecuteRegion.buffer) + _readExecuteRegion.unslidLoadAddress;
const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
cache->forEachImage(^(const mach_header* mh, const char* installName) {
((dyld3::MachOLoaded*)mh)->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& info, bool &stop) {
if ( (unslidVmAddr >= info.vmAddr) && (unslidVmAddr < (info.vmAddr+info.vmSize)) ) {
foundDylibName = installName;
foundSegName = info.segName;
stop = true;
}
});
});
}
template <typename P>
bool CacheBuilder::makeRebaseChainV2(uint8_t* pageContent, uint16_t lastLocationOffset, uint16_t offset, const dyld_cache_slide_info2* info)
{
typedef typename P::uint_t pint_t;
const pint_t deltaMask = (pint_t)(info->delta_mask);
const pint_t valueMask = ~deltaMask;
const pint_t valueAdd = (pint_t)(info->value_add);
const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2;
const uint32_t maxDelta = (uint32_t)(deltaMask >> deltaShift);
pint_t* lastLoc = (pint_t*)&pageContent[lastLocationOffset+0];
pint_t lastValue = (pint_t)P::getP(*lastLoc);
if ( (lastValue - valueAdd) & deltaMask ) {
std::string dylibName;
std::string segName;
findDylibAndSegment((void*)pageContent, dylibName, segName);
_diagnostics.error("rebase pointer (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) ) {
pint_t delta = offset - lastLocationOffset;
pint_t newLastValue = ((lastValue - valueAdd) & valueMask) | (delta << deltaShift);
P::setP(*lastLoc, newLastValue);
return true;
}
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 ) {
nonRebaseLocationOffsets[nrIndex] = i+j;
break;
}
}
if ( nonRebaseLocationOffsets[nrIndex] == 0 ) {
lastValue = (pint_t)P::getP(*lastLoc);
pint_t newValue = ((lastValue - valueAdd) & valueMask);
P::setP(*lastLoc, newValue);
return false;
}
i = nonRebaseLocationOffsets[nrIndex];
++nrIndex;
}
uint16_t prevOffset = lastLocationOffset;
pint_t* prevLoc = (pint_t*)&pageContent[prevOffset];
for (unsigned n=0; n < nrIndex; ++n) {
uint16_t nOffset = nonRebaseLocationOffsets[n];
assert(nOffset != 0);
pint_t* nLoc = (pint_t*)&pageContent[nOffset];
uint32_t delta2 = nOffset - prevOffset;
pint_t value = (pint_t)P::getP(*prevLoc);
pint_t newValue;
if ( value == 0 )
newValue = (delta2 << deltaShift);
else
newValue = ((value - valueAdd) & valueMask) | (delta2 << deltaShift);
P::setP(*prevLoc, newValue);
prevOffset = nOffset;
prevLoc = nLoc;
}
uint32_t delta3 = offset - prevOffset;
pint_t value = (pint_t)P::getP(*prevLoc);
pint_t newValue;
if ( value == 0 )
newValue = (delta3 << deltaShift);
else
newValue = ((value - valueAdd) & valueMask) | (delta3 << deltaShift);
P::setP(*prevLoc, newValue);
return true;
}
template <typename P>
void CacheBuilder::addPageStartsV2(uint8_t* pageContent, const bool bitmap[], const dyld_cache_slide_info2* info,
std::vector<uint16_t>& pageStarts, std::vector<uint16_t>& pageExtras)
{
typedef typename P::uint_t pint_t;
const pint_t deltaMask = (pint_t)(info->delta_mask);
const pint_t valueMask = ~deltaMask;
const uint32_t pageSize = info->page_size;
const pint_t valueAdd = (pint_t)(info->value_add);
uint16_t startValue = DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE;
uint16_t lastLocationOffset = 0xFFFF;
for(uint32_t i=0; i < pageSize/4; ++i) {
unsigned offset = i*4;
if ( bitmap[i] ) {
if ( startValue == DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE ) {
startValue = i;
}
else if ( !makeRebaseChainV2<P>(pageContent, lastLocationOffset, offset, info) ) {
if ( (startValue & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA) == 0 ) {
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 ) {
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 ) {
pageExtras.back() |= DYLD_CACHE_SLIDE_PAGE_ATTR_END;
}
pageStarts.push_back(startValue);
}
template <typename P>
void CacheBuilder::writeSlideInfoV2(const bool bitmap[], unsigned dataPageCount)
{
typedef typename P::uint_t pint_t;
typedef typename P::E E;
const uint32_t pageSize = 4096;
assert(_slideInfoFileOffset != 0);
dyld_cache_slide_info2* info = (dyld_cache_slide_info2*)_readOnlyRegion.buffer;
info->version = 2;
info->page_size = pageSize;
info->delta_mask = _archLayout->pointerDeltaMask;
info->value_add = _archLayout->useValueAdd ? _archLayout->sharedMemoryStart : 0;
std::vector<uint16_t> pageStarts;
std::vector<uint16_t> pageExtras;
pageStarts.reserve(dataPageCount);
uint8_t* pageContent = _readWriteRegion.buffer;
const bool* bitmapForPage = bitmap;
for (unsigned i=0; i < dataPageCount; ++i) {
addPageStartsV2<P>(pageContent, bitmapForPage, info, pageStarts, pageExtras);
if ( _diagnostics.hasError() ) {
return;
}
pageContent += pageSize;
bitmapForPage += (sizeof(bool)*(pageSize/4));
}
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];
uint64_t slideInfoSize = align(info->page_extras_offset + pageExtras.size()*sizeof(uint16_t), _archLayout->sharedRegionAlignP2);
if ( slideInfoSize > _slideInfoBufferSizeAllocated ) {
_diagnostics.error("kernel slide info overflow buffer");
}
((dyld_cache_header*)_readExecuteRegion.buffer)->slideInfoSize = slideInfoSize;
}
#if SUPPORT_ARCH_arm64_32 || SUPPORT_ARCH_armv7k
static bool smallValue(uint64_t value)
{
uint32_t high = (value & 0xFFFF8000);
return (high == 0) || (high == 0xFFFF8000);
}
template <typename P>
bool CacheBuilder::makeRebaseChainV4(uint8_t* pageContent, uint16_t lastLocationOffset, uint16_t offset, const dyld_cache_slide_info4* info)
{
typedef typename P::uint_t pint_t;
const pint_t deltaMask = (pint_t)(info->delta_mask);
const pint_t valueMask = ~deltaMask;
const pint_t valueAdd = (pint_t)(info->value_add);
const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2;
const uint32_t maxDelta = (uint32_t)(deltaMask >> deltaShift);
pint_t* lastLoc = (pint_t*)&pageContent[lastLocationOffset+0];
pint_t lastValue = (pint_t)P::getP(*lastLoc);
if ( (lastValue - valueAdd) & deltaMask ) {
std::string dylibName;
std::string segName;
findDylibAndSegment((void*)pageContent, dylibName, segName);
_diagnostics.error("rebase pointer does not point within cache. lastOffset=0x%04X, seg=%s, dylib=%s\n",
lastLocationOffset, segName.c_str(), dylibName.c_str());
return false;
}
if ( offset <= (lastLocationOffset+maxDelta) ) {
pint_t delta = offset - lastLocationOffset;
pint_t newLastValue = ((lastValue - valueAdd) & valueMask) | (delta << deltaShift);
P::setP(*lastLoc, newLastValue);
return true;
}
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) ) {
nonRebaseLocationOffsets[nrIndex] = i+j;
break;
}
}
if ( nonRebaseLocationOffsets[nrIndex] == 0 ) {
lastValue = (pint_t)P::getP(*lastLoc);
pint_t newValue = ((lastValue - valueAdd) & valueMask);
P::setP(*lastLoc, newValue);
return false;
}
i = nonRebaseLocationOffsets[nrIndex];
++nrIndex;
}
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);
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);
P::setP(*prevLoc, newValue);
return true;
}
template <typename P>
void CacheBuilder::addPageStartsV4(uint8_t* pageContent, const bool bitmap[], const dyld_cache_slide_info4* info,
std::vector<uint16_t>& pageStarts, std::vector<uint16_t>& pageExtras)
{
typedef typename P::uint_t pint_t;
const pint_t deltaMask = (pint_t)(info->delta_mask);
const pint_t valueMask = ~deltaMask;
const uint32_t pageSize = info->page_size;
const pint_t valueAdd = (pint_t)(info->value_add);
uint16_t startValue = DYLD_CACHE_SLIDE4_PAGE_NO_REBASE;
uint16_t lastLocationOffset = 0xFFFF;
for(uint32_t i=0; i < pageSize/4; ++i) {
unsigned offset = i*4;
if ( bitmap[i] ) {
if ( startValue == DYLD_CACHE_SLIDE4_PAGE_NO_REBASE ) {
startValue = i;
}
else if ( !makeRebaseChainV4<P>(pageContent, lastLocationOffset, offset, info) ) {
if ( (startValue & DYLD_CACHE_SLIDE4_PAGE_USE_EXTRA) == 0 ) {
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 ) {
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 ) {
pageExtras.back() |= DYLD_CACHE_SLIDE4_PAGE_EXTRA_END;
}
pageStarts.push_back(startValue);
}
template <typename P>
void CacheBuilder::writeSlideInfoV4(const bool bitmap[], unsigned dataPageCount)
{
typedef typename P::uint_t pint_t;
typedef typename P::E E;
const uint32_t pageSize = 4096;
assert(_slideInfoFileOffset != 0);
dyld_cache_slide_info4* info = (dyld_cache_slide_info4*)_readOnlyRegion.buffer;
info->version = 4;
info->page_size = pageSize;
info->delta_mask = _archLayout->pointerDeltaMask;
info->value_add = info->value_add = _archLayout->useValueAdd ? _archLayout->sharedMemoryStart : 0;
std::vector<uint16_t> pageStarts;
std::vector<uint16_t> pageExtras;
pageStarts.reserve(dataPageCount);
uint8_t* pageContent = _readWriteRegion.buffer;
const bool* bitmapForPage = bitmap;
for (unsigned i=0; i < dataPageCount; ++i) {
addPageStartsV4<P>(pageContent, bitmapForPage, info, pageStarts, pageExtras);
if ( _diagnostics.hasError() ) {
return;
}
pageContent += pageSize;
bitmapForPage += (sizeof(bool)*(pageSize/4));
}
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];
uint64_t slideInfoSize = align(info->page_extras_offset + pageExtras.size()*sizeof(uint16_t), _archLayout->sharedRegionAlignP2);
if ( slideInfoSize > _slideInfoBufferSizeAllocated ) {
_diagnostics.error("kernel slide info v4 overflow buffer");
}
((dyld_cache_header*)_readExecuteRegion.buffer)->slideInfoSize = slideInfoSize;
}
#endif
uint16_t CacheBuilder::pageStartV3(uint8_t* pageContent, uint32_t pageSize, const bool bitmap[])
{
const int maxPerPage = pageSize / 4;
uint16_t result = DYLD_CACHE_SLIDE_V3_PAGE_ATTR_NO_REBASE;
dyld3::MachOLoaded::ChainedFixupPointerOnDisk* lastLoc = nullptr;
for (int i=0; i < maxPerPage; ++i) {
if ( bitmap[i] ) {
if ( result == DYLD_CACHE_SLIDE_V3_PAGE_ATTR_NO_REBASE ) {
result = i * 4;
}
dyld3::MachOLoaded::ChainedFixupPointerOnDisk* loc = (dyld3::MachOLoaded::ChainedFixupPointerOnDisk*)(pageContent + i*4);;
if ( lastLoc != nullptr ) {
lastLoc->arm64e.rebase.next = loc - lastLoc;
}
lastLoc = loc;
}
}
if ( lastLoc != nullptr ) {
lastLoc->arm64e.rebase.next = 0;
}
return result;
}
void CacheBuilder::writeSlideInfoV3(const bool bitmap[], unsigned dataPageCount)
{
const uint32_t pageSize = 4096;
assert(_slideInfoFileOffset != 0);
dyld_cache_slide_info3* info = (dyld_cache_slide_info3*)_readOnlyRegion.buffer;
info->version = 3;
info->page_size = pageSize;
info->page_starts_count = dataPageCount;
info->auth_value_add = _archLayout->sharedMemoryStart;
uint8_t* pageContent = _readWriteRegion.buffer;
const bool* bitmapForPage = bitmap;
for (unsigned i=0; i < dataPageCount; ++i) {
info->page_starts[i] = pageStartV3(pageContent, pageSize, bitmapForPage);
pageContent += pageSize;
bitmapForPage += (sizeof(bool)*(pageSize/4));
}
dyld_cache_header* dyldCacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer;
dyldCacheHeader->slideInfoSize = align(__offsetof(dyld_cache_slide_info3, page_starts[dataPageCount]), _archLayout->sharedRegionAlignP2);
if ( dyldCacheHeader->slideInfoSize > _slideInfoBufferSizeAllocated ) {
_diagnostics.error("kernel slide info overflow buffer");
}
}
void CacheBuilder::fipsSign()
{
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;
}
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;
}
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); }
void CacheBuilder::codeSign()
{
uint8_t dscHashType;
uint8_t dscHashSize;
uint32_t dscDigestFormat;
bool agile = false;
switch (_options.codeSigningDigestMode) {
case DyldSharedCache::Agile:
agile = true;
[[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";
}
size_t inBbufferSize = _readExecuteRegion.sizeInUse+_readWriteRegion.sizeInUse+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse;
const uint16_t pageSize = _archLayout->csPageSize;
uint32_t blobCount = agile ? 4 : 3;
size_t idSize = cacheIdentifier.size()+1; 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; size_t cmsOffset = reqsOffset + reqsSize;
size_t sbSize = cmsOffset + cmsSize;
size_t sigSize = align(sbSize, 14);
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;
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);
}
CS_RequirementsBlob* reqs = (CS_RequirementsBlob*)(((char*)sb)+reqsOffset);
reqs->magic = htonl(CSMAGIC_REQUIREMENTS);
reqs->length = htonl(sizeof(CS_RequirementsBlob));
reqs->data = 0;
CS_CodeDirectory* cd = (CS_CodeDirectory*)(((char*)sb)+cdOffset);
cd->magic = htonl(CSMAGIC_CODEDIRECTORY);
cd->length = htonl(cdSize);
cd->version = htonl(0x20400); 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; cd->pageSize = __builtin_ctz(pageSize); cd->spare2 = 0; cd->scatterOffset = 0; cd->teamOffset = 0; cd->spare3 = 0; cd->codeLimit64 = 0;
cd->execSegBase = htonll(_readExecuteRegion.cacheFileOffset); cd->execSegLimit = htonll(_readExecuteRegion.sizeInUse); cd->execSegFlags = 0;
strcpy((char*)cd + idOffset, cacheIdentifier.c_str());
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 ) {
cd256 = (CS_CodeDirectory*)(((char*)sb)+cd256Offset);
cd256->magic = htonl(CSMAGIC_CODEDIRECTORY);
cd256->length = htonl(cd256Size);
cd256->version = htonl(0x20400); 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; cd256->pageSize = __builtin_ctz(pageSize); cd256->spare2 = 0; cd256->scatterOffset = 0; cd256->teamOffset = 0; cd256->spare3 = 0; cd256->codeLimit64 = 0;
cd256->execSegBase = cd->execSegBase;
cd256->execSegLimit = cd->execSegLimit;
cd256->execSegFlags = cd->execSegFlags;
strcpy((char*)cd256 + idOffset, cacheIdentifier.c_str());
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;
}
CS_Blob* cms = (CS_Blob*)(((char*)sb)+cmsOffset);
cms->magic = htonl(CSMAGIC_BLOBWRAPPER);
cms->length = htonl(sizeof(CS_Blob));
dyld_cache_header* cache = (dyld_cache_header*)_readExecuteRegion.buffer;
cache->codeSignatureOffset = inBbufferSize;
cache->codeSignatureSize = sigSize;
const uint32_t rwSlotStart = (uint32_t)(_readExecuteRegion.sizeInUse / pageSize);
const uint32_t roSlotStart = (uint32_t)(rwSlotStart + _readWriteRegion.sizeInUse / pageSize);
const uint32_t localsSlotStart = (uint32_t)(roSlotStart + _readOnlyRegion.sizeInUse / pageSize);
auto codeSignPage = ^(size_t i) {
const uint8_t* code = nullptr;
if ( i < rwSlotStart )
code = _readExecuteRegion.buffer + (i * pageSize);
else if ( i >= rwSlotStart && i < roSlotStart )
code = _readWriteRegion.buffer + ((i - rwSlotStart) * pageSize);
else if ( i >= roSlotStart && i < localsSlotStart )
code = _readOnlyRegion.buffer + ((i - roSlotStart) * pageSize);
else
code = _localSymbolsRegion.buffer + ((i - localsSlotStart) * pageSize);
CCDigest(dscDigestFormat, code, pageSize, hashSlot + (i * dscHashSize));
if ( agile ) {
CCDigest(kCCDigestSHA256, code, pageSize, hash256Slot + (i * CS_HASH_SIZE_SHA256));
}
};
dispatch_apply(slotCount, DISPATCH_APPLY_AUTO, ^(size_t i) {
codeSignPage(i);
});
{
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);
uuidLoc[6] = ( uuidLoc[6] & 0x0F ) | ( 3 << 4 );
uuidLoc[8] = ( uuidLoc[8] & 0x3F ) | 0x80;
codeSignPage(0);
}
uint8_t fullCdHash[dscHashSize];
CCDigest(dscDigestFormat, (const uint8_t*)cd, cdSize, fullCdHash);
memcpy(_cdHashFirst, fullCdHash, 20);
if ( agile ) {
uint8_t fullCdHash256[CS_HASH_SIZE_SHA256];
CCDigest(kCCDigestSHA256, (const uint8_t*)cd256, cd256Size, fullCdHash256);
memcpy(_cdHashSecond, fullCdHash256, 20);
}
else {
memset(_cdHashSecond, 0, 20);
}
}
const bool CacheBuilder::agileSignature()
{
return _options.codeSigningDigestMode == DyldSharedCache::Agile;
}
static const std::string cdHash(uint8_t hash[20])
{
char buff[48];
for (int i = 0; i < 20; ++i)
sprintf(&buff[2*i], "%2.2x", hash[i]);
return buff;
}
const std::string CacheBuilder::cdHashFirst()
{
return cdHash(_cdHashFirst);
}
const std::string CacheBuilder::cdHashSecond()
{
return cdHash(_cdHashSecond);
}
const std::string CacheBuilder::uuid() const
{
dyld_cache_header* cache = (dyld_cache_header*)_readExecuteRegion.buffer;
uuid_string_t uuidStr;
uuid_unparse(cache->uuid, uuidStr);
return uuidStr;
}
static dyld_cache_patchable_location makePatchLocation(size_t cacheOff, uint64_t ad) {
int64_t signedAddend = (int64_t)ad;
assert(((signedAddend << 52) >> 52) == signedAddend);
dyld_cache_patchable_location patch;
patch.cacheOffset = cacheOff;
patch.addend = ad;
patch.authenticated = 0;
patch.usesAddressDiversity = 0;
patch.key = 0;
patch.discriminator = 0;
return patch;
}
static dyld_cache_patchable_location makePatchLocation(size_t cacheOff, uint64_t ad,
dyld3::MachOLoaded::ChainedFixupPointerOnDisk authInfo) {
int64_t signedAddend = (int64_t)ad;
assert(((signedAddend << 52) >> 52) == signedAddend);
dyld_cache_patchable_location patch;
patch.cacheOffset = cacheOff;
patch.addend = ad;
patch.authenticated = authInfo.arm64e.authBind.auth;
patch.usesAddressDiversity = authInfo.arm64e.authBind.addrDiv;
patch.key = authInfo.arm64e.authBind.key;
patch.discriminator = authInfo.arm64e.authBind.diversity;
return patch;
}
void CacheBuilder::buildImageArray(std::vector<DyldSharedCache::FileAlias>& aliases)
{
typedef dyld3::closure::ClosureBuilder::CachedDylibInfo CachedDylibInfo;
__block std::vector<CachedDylibInfo> dylibInfos;
__block std::unordered_map<dyld3::closure::ImageNum, const dyld3::MachOLoaded*> imageNumToML;
DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
cache->forEachImage(^(const mach_header* mh, const char* installName) {
uint64_t mtime;
uint64_t inode;
cache->getIndexedImageEntry((uint32_t)dylibInfos.size(), mtime, inode);
CachedDylibInfo entry;
entry.fileInfo.fileContent = mh;
entry.fileInfo.path = installName;
entry.fileInfo.sliceOffset = 0;
entry.fileInfo.inode = inode;
entry.fileInfo.mtime = mtime;
dylibInfos.push_back(entry);
imageNumToML[(dyld3::closure::ImageNum)(dylibInfos.size())] = (dyld3::MachOLoaded*)mh;
});
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() });
dyld3::closure::ClosureBuilder::CacheDylibsBindingHandlers handlers;
handlers.chainedBind = ^(dyld3::closure::ImageNum, const dyld3::MachOLoaded* imageLoadAddress,
const dyld_chained_starts_in_image* starts,
const dyld3::Array<dyld3::closure::Image::ResolvedSymbolTarget>& targets,
const dyld3::Array<dyld3::closure::ClosureBuilder::ResolvedTargetInfo>& targetInfos) {
imageLoadAddress->forEachFixupInAllChains(_diagnostics, starts, false, ^(dyld3::MachOLoaded::ChainedFixupPointerOnDisk* fixupLoc, const dyld_chained_starts_in_segment* segInfo, bool& stop) {
uint64_t offsetInCache;
dyld3::closure::Image::ResolvedSymbolTarget target;
const dyld3::closure::ClosureBuilder::ResolvedTargetInfo* targetInfo;
switch (segInfo->pointer_format) {
case DYLD_CHAINED_PTR_ARM64E:
if ( fixupLoc->arm64e.bind.bind ) {
target = targets[fixupLoc->arm64e.bind.ordinal];
targetInfo = &targetInfos[fixupLoc->arm64e.bind.ordinal];
switch ( target.sharedCache.kind ) {
case dyld3::closure::Image::ResolvedSymbolTarget::kindSharedCache:
offsetInCache = target.sharedCache.offset - targetInfo->addend;
_dylibToItsExports[targetInfo->foundInDylib].insert(offsetInCache);
_exportsToName[offsetInCache] = targetInfo->foundSymbolName;
if ( fixupLoc->arm64e.authBind.auth ) {
fixupLoc->arm64e.authRebase.bind = 0;
fixupLoc->arm64e.authRebase.target = target.sharedCache.offset;
_exportsToUses[offsetInCache].push_back(makePatchLocation((uint8_t*)fixupLoc - _readExecuteRegion.buffer, targetInfo->addend, *fixupLoc));
}
else {
fixupLoc->arm64e.rebase.bind = 0;
fixupLoc->arm64e.rebase.target = _archLayout->sharedMemoryStart + target.sharedCache.offset;
_exportsToUses[offsetInCache].push_back(makePatchLocation((uint8_t*)fixupLoc - _readExecuteRegion.buffer, targetInfo->addend));
}
_aslrTracker.add(fixupLoc);
break;
case dyld3::closure::Image::ResolvedSymbolTarget::kindAbsolute:
fixupLoc->raw64 = target.absolute.value;
_aslrTracker.remove(fixupLoc);
if ( (targetInfo->libOrdinal > 0) && (targetInfo->libOrdinal <= (int)(imageLoadAddress->dependentDylibCount())) ) {
_missingWeakImports[fixupLoc] = imageLoadAddress->dependentDylibLoadPath(targetInfo->libOrdinal - 1);
}
break;
default:
assert(0 && "unsupported ResolvedSymbolTarget kind in dyld cache");
}
} else {
_aslrTracker.add(fixupLoc);
}
break;
case DYLD_CHAINED_PTR_64:
if ( fixupLoc->generic64.bind.bind ) {
target = targets[fixupLoc->generic64.bind.ordinal];
targetInfo = &targetInfos[fixupLoc->generic64.bind.ordinal];
switch ( target.sharedCache.kind ) {
case dyld3::closure::Image::ResolvedSymbolTarget::kindSharedCache:
offsetInCache = target.sharedCache.offset - targetInfo->addend;
_dylibToItsExports[targetInfo->foundInDylib].insert(offsetInCache);
_exportsToName[offsetInCache] = targetInfo->foundSymbolName;
fixupLoc->generic64.rebase.bind = 0;
fixupLoc->generic64.rebase.next = 0; fixupLoc->generic64.rebase.reserved = 0;
fixupLoc->generic64.rebase.high8 = 0;
fixupLoc->generic64.rebase.target = target.sharedCache.offset;
_exportsToUses[offsetInCache].push_back(makePatchLocation((uint8_t*)fixupLoc - _readExecuteRegion.buffer, targetInfo->addend));
_aslrTracker.add(fixupLoc);
break;
case dyld3::closure::Image::ResolvedSymbolTarget::kindAbsolute:
fixupLoc->raw64 = target.absolute.value;
if ( (targetInfo->libOrdinal > 0) && (targetInfo->libOrdinal <= (int)(imageLoadAddress->dependentDylibCount())) ) {
_missingWeakImports[fixupLoc] = imageLoadAddress->dependentDylibLoadPath(targetInfo->libOrdinal - 1);
}
break;
default:
assert(0 && "unsupported ResolvedSymbolTarget kind in dyld cache");
}
}
break;
case DYLD_CHAINED_PTR_32:
if ( fixupLoc->generic32.bind.bind ) {
target = targets[fixupLoc->generic32.bind.ordinal];
targetInfo = &targetInfos[fixupLoc->generic32.bind.ordinal];
switch ( target.sharedCache.kind ) {
case dyld3::closure::Image::ResolvedSymbolTarget::kindSharedCache:
offsetInCache = target.sharedCache.offset - targetInfo->addend;
_dylibToItsExports[targetInfo->foundInDylib].insert(offsetInCache);
_exportsToName[offsetInCache] = targetInfo->foundSymbolName;
fixupLoc->cache32.next = 0; fixupLoc->cache32.target = (uint32_t)(target.sharedCache.offset);
_exportsToUses[offsetInCache].push_back(makePatchLocation((uint8_t*)fixupLoc - _readExecuteRegion.buffer, targetInfo->addend));
_aslrTracker.add(fixupLoc);
break;
case dyld3::closure::Image::ResolvedSymbolTarget::kindAbsolute:
fixupLoc->raw32 = (uint32_t)target.absolute.value;
if ( (targetInfo->libOrdinal > 0) && (targetInfo->libOrdinal <= (int)(imageLoadAddress->dependentDylibCount())) ) {
_missingWeakImports[fixupLoc] = imageLoadAddress->dependentDylibLoadPath(targetInfo->libOrdinal - 1);
}
break;
default:
assert(0 && "unsupported ResolvedSymbolTarget kind in dyld cache");
}
}
break;
default:
assert(0 && "unsupported chained bind type");
}
});
};
handlers.rebase = ^(dyld3::closure::ImageNum imageNum, const dyld3::MachOLoaded* imageToFix, uint32_t runtimeOffset) {
uint8_t* fixupLoc = (uint8_t*)imageToFix+runtimeOffset;
_aslrTracker.add(fixupLoc);
};
handlers.bind = ^(dyld3::closure::ImageNum imageNum, const dyld3::MachOLoaded* mh,
uint32_t runtimeOffset, dyld3::closure::Image::ResolvedSymbolTarget target,
const dyld3::closure::ClosureBuilder::ResolvedTargetInfo& targetInfo) {
uint8_t* fixupLoc = (uint8_t*)mh+runtimeOffset;
const bool weakDefUseAlreadySet = targetInfo.weakBindCoalese && _aslrTracker.has(fixupLoc);
uint64_t offsetInCache;
switch ( target.sharedCache.kind ) {
case dyld3::closure::Image::ResolvedSymbolTarget::kindSharedCache:
offsetInCache = target.sharedCache.offset - targetInfo.addend;
_dylibToItsExports[targetInfo.foundInDylib].insert(offsetInCache);
if (targetInfo.isWeakDef)
_dylibWeakExports.insert({ targetInfo.foundInDylib, offsetInCache });
_exportsToUses[offsetInCache].push_back(makePatchLocation(fixupLoc - _readExecuteRegion.buffer, targetInfo.addend));
_exportsToName[offsetInCache] = targetInfo.foundSymbolName;
if ( !weakDefUseAlreadySet ) {
if ( _archLayout->is64 )
*((uint64_t*)fixupLoc) = _archLayout->sharedMemoryStart + target.sharedCache.offset;
else
*((uint32_t*)fixupLoc) = (uint32_t)(_archLayout->sharedMemoryStart + target.sharedCache.offset);
_aslrTracker.add(fixupLoc);
}
break;
case dyld3::closure::Image::ResolvedSymbolTarget::kindAbsolute:
if ( _archLayout->is64 )
*((uint64_t*)fixupLoc) = target.absolute.value;
else
*((uint32_t*)fixupLoc) = (uint32_t)(target.absolute.value);
_aslrTracker.remove(fixupLoc);
if ( (targetInfo.libOrdinal > 0) && (targetInfo.libOrdinal <= (int)(mh->dependentDylibCount())) ) {
_missingWeakImports[fixupLoc] = mh->dependentDylibLoadPath(targetInfo.libOrdinal - 1);
}
break;
default:
assert(0 && "unsupported ResolvedSymbolTarget kind in dyld cache");
}
};
dyld3::closure::PathOverrides pathOverrides;
dyld3::closure::ClosureBuilder cb(dyld3::closure::kFirstDyldCacheImageNum, _fileSystem, cache, false, *_options.archs, pathOverrides,
dyld3::closure::ClosureBuilder::AtPath::none, false, nullptr, _options.platform, &handlers);
dyld3::Array<CachedDylibInfo> dylibs(&dylibInfos[0], dylibInfos.size(), dylibInfos.size());
const dyld3::Array<dyld3::closure::ClosureBuilder::CachedDylibAlias> aliasesArray(dylibAliases.data(), dylibAliases.size(), dylibAliases.size());
_imageArray = cb.makeDyldCacheImageArray(_options.optimizeStubs, dylibs, aliasesArray);
if ( cb.diagnostics().hasError() ) {
_diagnostics.error("%s", cb.diagnostics().errorMessage().c_str());
return;
}
}
static bool operator==(const dyld_cache_patchable_location& a, const dyld_cache_patchable_location& b) {
return a.cacheOffset == b.cacheOffset;
}
void CacheBuilder::addImageArray()
{
__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);
std::unordered_set<std::string> alwaysGeneratePatch;
for (const char* const* p=_s_neverStubEliminateSymbols; *p != nullptr; ++p)
alwaysGeneratePatch.insert(*p);
__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();
};
std::set<std::string> alwaysPatchDylibs;
for (const char* const* d= _s_neverStubEliminateDylibs; *d != nullptr; ++d)
alwaysPatchDylibs.insert(*d);
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];
bool dylibNeedsPatching = !_options.optimizeStubs || alwaysPatchDylibs.count(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;
});
__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);
cache->forEachImage(^(const mach_header* mh, const char* installName) {
const dyld3::MachOLoaded* ml = (const dyld3::MachOLoaded*)mh;
const std::set<CacheOffset>& dylibExports = _dylibToItsExports[ml];
bool dylibNeedsPatching = !_options.optimizeStubs || alwaysPatchDylibs.count(installName);
dyld_cache_image_patches patchImage;
patchImage.patchExportsStartIndex = (uint32_t)patchExports.size();
patchImage.patchExportsCount = 0;
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);
patchLocations.insert(patchLocations.end(), uses.begin(), uses.end());
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();
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;
}
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());
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);
_imageArray->deallocate();
}
void CacheBuilder::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::closure::ClosureBuilder cb(dyld3::closure::kFirstOtherOSImageNum, nullFileSystem, cache, false, *_options.archs, pathOverrides,
dyld3::closure::ClosureBuilder::AtPath::none, false, nullptr, _options.platform);
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);
}
std::sort(others.begin(), others.end(),
[](const dyld3::closure::LoadedFileInfo& a, const dyld3::closure::LoadedFileInfo& b) {
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());
__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);
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;
}
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);
otherImageArray->deallocate();
}
void CacheBuilder::addClosures(const std::vector<LoadedMachO>& osExecutables)
{
const DyldSharedCache* dyldCache = (DyldSharedCache*)_readExecuteRegion.buffer;
__block std::vector<Diagnostics> osExecutablesDiags;
__block std::vector<const dyld3::closure::LaunchClosure*> osExecutablesClosures;
osExecutablesDiags.resize(osExecutables.size());
osExecutablesClosures.resize(osExecutables.size());
dispatch_apply(osExecutables.size(), DISPATCH_APPLY_AUTO, ^(size_t index) {
const LoadedMachO& loadedMachO = osExecutables[index];
if ( startsWith(loadedMachO.mappedFile.runtimePath, "/private/var/staged_system_apps/") ) {
return;
}
dyld3::closure::PathOverrides pathOverrides;
dyld3::closure::ClosureBuilder builder(dyld3::closure::kFirstLaunchClosureImageNum, _fileSystem, dyldCache, false, *_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 {
if (osExecutablesClosures[i] != nullptr)
closures[loadedMachO.mappedFile.runtimePath] = osExecutablesClosures[i];
}
}
osExecutablesDiags.clear();
osExecutablesClosures.clear();
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;
DylibIndexTrie closureTrie(closureEntrys);
std::vector<uint8_t> trieBytes;
closureTrie.emit(trieBytes);
while ( (trieBytes.size() % 8) != 0 )
trieBytes.push_back(0);
if ( trieBytes.size() > freeSpace ) {
_diagnostics.error("cache buffer too small to hold all closures trie (buffer size=%lldMB, trie size=%ldMB, free space=%ldMB)",
_allocatedBufferSize/1024/1024, trieBytes.size()/1024/1024, freeSpace/1024/1024);
return;
}
memcpy(_readOnlyRegion.buffer + _readOnlyRegion.sizeInUse, &trieBytes[0], trieBytes.size());
cache->header.progClosuresTrieAddr = _readOnlyRegion.unslidLoadAddress + _readOnlyRegion.sizeInUse;
cache->header.progClosuresTrieSize = trieBytes.size();
_readOnlyRegion.sizeInUse += trieBytes.size();
_readOnlyRegion.sizeInUse = align(_readOnlyRegion.sizeInUse, 14);
}
bool CacheBuilder::writeCache(void (^cacheSizeCallback)(uint64_t size), bool (^copyCallback)(const uint8_t* src, uint64_t size, uint64_t dstOffset))
{
const dyld_cache_header* cacheHeader = (dyld_cache_header*)_readExecuteRegion.buffer;
const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(_readExecuteRegion.buffer + cacheHeader->mappingOffset);
assert(_readExecuteRegion.sizeInUse == mappings[0].size);
assert(_readWriteRegion.sizeInUse == mappings[1].size);
assert(_readOnlyRegion.sizeInUse == mappings[2].size);
assert(_readExecuteRegion.cacheFileOffset == mappings[0].fileOffset);
assert(_readWriteRegion.cacheFileOffset == mappings[1].fileOffset);
assert(_readOnlyRegion.cacheFileOffset == mappings[2].fileOffset);
assert(_codeSignatureRegion.sizeInUse == cacheHeader->codeSignatureSize);
assert(cacheHeader->codeSignatureOffset == mappings[2].fileOffset+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse);
cacheSizeCallback(_readExecuteRegion.sizeInUse+_readWriteRegion.sizeInUse+_readOnlyRegion.sizeInUse+_localSymbolsRegion.sizeInUse+_codeSignatureRegion.sizeInUse);
bool fullyWritten = copyCallback(_readExecuteRegion.buffer, _readExecuteRegion.sizeInUse, mappings[0].fileOffset);
fullyWritten &= copyCallback(_readWriteRegion.buffer, _readWriteRegion.sizeInUse, mappings[1].fileOffset);
fullyWritten &= copyCallback(_readOnlyRegion.buffer, _readOnlyRegion.sizeInUse, mappings[2].fileOffset);
if ( _localSymbolsRegion.sizeInUse != 0 ) {
assert(cacheHeader->localSymbolsOffset == mappings[2].fileOffset+_readOnlyRegion.sizeInUse);
fullyWritten &= copyCallback(_localSymbolsRegion.buffer, _localSymbolsRegion.sizeInUse, cacheHeader->localSymbolsOffset);
}
fullyWritten &= copyCallback(_codeSignatureRegion.buffer, _codeSignatureRegion.sizeInUse, cacheHeader->codeSignatureOffset);
return fullyWritten;
}
void CacheBuilder::writeFile(const std::string& path)
{
std::string pathTemplate = path + "-XXXXXX";
size_t templateLen = strlen(pathTemplate.c_str())+2;
BLOCK_ACCCESSIBLE_ARRAY(char, pathTemplateSpace, templateLen);
strlcpy(pathTemplateSpace, pathTemplate.c_str(), templateLen);
int fd = mkstemp(pathTemplateSpace);
if ( fd != -1 ) {
auto cacheSizeCallback = ^(uint64_t size) {
if ( (_options.platform == dyld3::Platform::macOS) && startsWith(path, MACOSX_DYLD_SHARED_CACHE_DIR) ) {
apfs_data_pin_location_t where = APFS_PIN_DATA_TO_MAIN;
::fsctl(pathTemplateSpace, APFSIOC_PIN_DATA, &where, 0);
}
::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;
};
char tempPath[MAXPATHLEN];
if ( ::fcntl(fd, F_GETPATH, tempPath) == 0 ) {
size_t tempPathLen = strlen(tempPath);
if ( tempPathLen > 7 )
tempPath[tempPathLen-7] = '\0'; 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); char resolvedPath[PATH_MAX];
::realpath(path.c_str(), resolvedPath);
if ( path != resolvedPath ) {
_diagnostics.error("output file path changed from: '%s' to: '%s'", path.c_str(), resolvedPath);
return;
}
if ( ::rename(pathTemplateSpace, path.c_str()) == 0) {
::close(fd);
return; }
}
else {
_diagnostics.error("could not write file %s", pathTemplateSpace);
}
::close(fd);
::unlink(pathTemplateSpace);
}
else {
_diagnostics.error("could not open file %s", pathTemplateSpace);
}
}
void CacheBuilder::writeBuffer(uint8_t*& buffer, uint64_t& bufferSize) {
auto cacheSizeCallback = ^(uint64_t size) {
buffer = (uint8_t*)malloc(size);
bufferSize = size;
};
auto copyCallback = ^(const uint8_t* src, uint64_t size, uint64_t dstOffset) {
memcpy(buffer + dstOffset, src, size);
return true;
};
bool fullyWritten = writeCache(cacheSizeCallback, copyCallback);
assert(fullyWritten);
}
void CacheBuilder::writeMapFile(const std::string& path)
{
const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
std::string mapContent = cache->mapFile();
safeSave(mapContent.c_str(), mapContent.size(), path);
}
std::string CacheBuilder::getMapFileBuffer(const std::string& cacheDisposition) const
{
const DyldSharedCache* cache = (DyldSharedCache*)_readExecuteRegion.buffer;
return cache->generateJSONMap(cacheDisposition.c_str());
}
void CacheBuilder::forEachCacheDylib(void (^callback)(const std::string& path)) {
for (const DylibInfo& dylibInfo : _sortedDylibs)
callback(dylibInfo.runtimePath);
}
CacheBuilder::ASLR_Tracker::~ASLR_Tracker()
{
if ( _bitmap != nullptr )
::free(_bitmap);
}
void CacheBuilder::ASLR_Tracker::setDataRegion(const void* rwRegionStart, size_t rwRegionSize)
{
_pageCount = (unsigned)(rwRegionSize+_pageSize-1)/_pageSize;
_regionStart = (uint8_t*)rwRegionStart;
_endStart = (uint8_t*)rwRegionStart + rwRegionSize;
_bitmap = (bool*)calloc(_pageCount*(_pageSize/4)*sizeof(bool), 1);
}
void CacheBuilder::ASLR_Tracker::add(void* loc)
{
if (!_enabled)
return;
uint8_t* p = (uint8_t*)loc;
assert(p >= _regionStart);
assert(p < _endStart);
_bitmap[(p-_regionStart)/4] = true;
}
void CacheBuilder::ASLR_Tracker::remove(void* loc)
{
if (!_enabled)
return;
uint8_t* p = (uint8_t*)loc;
assert(p >= _regionStart);
assert(p < _endStart);
_bitmap[(p-_regionStart)/4] = false;
}
bool CacheBuilder::ASLR_Tracker::has(void* loc)
{
if (!_enabled)
return true;
uint8_t* p = (uint8_t*)loc;
assert(p >= _regionStart);
assert(p < _endStart);
return _bitmap[(p-_regionStart)/4];
}
bool CacheBuilder::DylibTextCoalescer::sectionWasCoalesced(std::string_view sectionName) const {
if (sectionName.size() > 16)
sectionName = sectionName.substr(0, 16);
std::map<std::string_view, const DylibSectionOffsetToCacheSectionOffset*> supportedSections = {
{ "__objc_classname", &objcClassNames },
{ "__objc_methname", &objcMethNames },
{ "__objc_methtype", &objcMethTypes }
};
auto it = supportedSections.find(sectionName);
if (it == supportedSections.end())
return false;
return !it->second->empty();
}
CacheBuilder::DylibTextCoalescer::DylibSectionOffsetToCacheSectionOffset& CacheBuilder::DylibTextCoalescer::getSectionCoalescer(std::string_view sectionName) {
if (sectionName.size() > 16)
sectionName = sectionName.substr(0, 16);
std::map<std::string_view, DylibSectionOffsetToCacheSectionOffset*> supportedSections = {
{ "__objc_classname", &objcClassNames },
{ "__objc_methname", &objcMethNames },
{ "__objc_methtype", &objcMethTypes }
};
auto it = supportedSections.find(sectionName);
assert(it != supportedSections.end());
return *it->second;
}
const CacheBuilder::DylibTextCoalescer::DylibSectionOffsetToCacheSectionOffset& CacheBuilder::DylibTextCoalescer::getSectionCoalescer(std::string_view sectionName) const {
if (sectionName.size() > 16)
sectionName = sectionName.substr(0, 16);
std::map<std::string_view, const DylibSectionOffsetToCacheSectionOffset*> supportedSections = {
{ "__objc_classname", &objcClassNames },
{ "__objc_methname", &objcMethNames },
{ "__objc_methtype", &objcMethTypes }
};
auto it = supportedSections.find(sectionName);
assert(it != supportedSections.end());
return *it->second;
}
const char* CacheBuilder::CacheCoalescedText::SupportedSections[] = {
"__objc_classname",
"__objc_methname",
"__objc_methtype",
};
void CacheBuilder::CacheCoalescedText::parseCoalescableText(const dyld3::MachOAnalyzer *ma,
DylibTextCoalescer& textCoalescer) {
static const bool log = false;
uint32_t splitSegSize = 0;
const void* splitSegStart = ma->getSplitSeg(splitSegSize);
if (!splitSegStart)
return;
if ((*(const uint8_t*)splitSegStart) != DYLD_CACHE_ADJ_V2_FORMAT)
return;
__block std::vector<std::pair<std::string, dyld3::MachOAnalyzer::SectionInfo>> textSectionInfos;
ma->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo §Info, bool malformedSectionRange, bool &stop) {
if (strcmp(sectInfo.segInfo.segName, "__TEXT") != 0)
return;
assert(!malformedSectionRange);
textSectionInfos.push_back({ sectInfo.sectName, sectInfo });
});
const std::set<std::string_view> supportedSections(std::begin(SupportedSections), std::end(SupportedSections));
int64_t slide = ma->getSlide();
for (auto sectionInfoIt = textSectionInfos.rbegin(); sectionInfoIt != textSectionInfos.rend(); ++sectionInfoIt) {
const std::string& sectionName = sectionInfoIt->first;
const dyld3::MachOAnalyzer::SectionInfo& sectInfo = sectionInfoIt->second;
if (supportedSections.find(sectionName) == supportedSections.end())
break;
StringSection& cacheStringSection = getSectionData(sectionName);
DylibTextCoalescer::DylibSectionOffsetToCacheSectionOffset& sectionStringData = textCoalescer.getSectionCoalescer(sectionName);
const uint8_t* content = (uint8_t*)(sectInfo.sectAddr + slide);
const char* s = (char*)content;
const char* end = s + sectInfo.sectSize;
while ( s < end ) {
std::string_view str = s;
auto itAndInserted = cacheStringSection.stringsToOffsets.insert({ str, cacheStringSection.bufferSize });
if (itAndInserted.second) {
cacheStringSection.bufferSize += str.size() + 1;
if (log)
printf("Selector: %s -> %s\n", ma->installName(), s);
} else {
cacheStringSection.savedSpace += str.size() + 1;
}
uint32_t sourceSectionOffset = (uint32_t)((uint64_t)s - (uint64_t)content);
uint32_t cacheSectionOffset = itAndInserted.first->second;
sectionStringData[sourceSectionOffset] = cacheSectionOffset;
s += str.size() + 1;
}
}
}
void CacheBuilder::CacheCoalescedText::clear() {
*this = CacheBuilder::CacheCoalescedText();
}
CacheBuilder::CacheCoalescedText::StringSection& CacheBuilder::CacheCoalescedText::getSectionData(std::string_view sectionName) {
if (sectionName.size() > 16)
sectionName = sectionName.substr(0, 16);
std::map<std::string_view, StringSection*> supportedSections = {
{ "__objc_classname", &objcClassNames },
{ "__objc_methname", &objcMethNames },
{ "__objc_methtype", &objcMethTypes }
};
auto it = supportedSections.find(sectionName);
assert(it != supportedSections.end());
return *it->second;
}
const CacheBuilder::CacheCoalescedText::StringSection& CacheBuilder::CacheCoalescedText::getSectionData(std::string_view sectionName) const {
if (sectionName.size() > 16)
sectionName = sectionName.substr(0, 16);
std::map<std::string_view, const StringSection*> supportedSections = {
{ "__objc_classname", &objcClassNames },
{ "__objc_methname", &objcMethNames },
{ "__objc_methtype", &objcMethTypes }
};
auto it = supportedSections.find(sectionName);
assert(it != supportedSections.end());
return *it->second;
}