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+++ dyld/dyld-941.4/common/MachOFile.cpp
@@ -0,0 +1,1937 @@
+/*
+ * Copyright (c) 2017 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/fcntl.h>
+#include <unistd.h>
+#include <TargetConditionals.h>
+#include <mach/host_info.h>
+#include <mach/mach.h>
+#include <mach/mach_host.h>
+
+#include "Array.h"
+#include "MachOFile.h"
+#include "SupportedArchs.h"
+
+#if BUILDING_DYLD || BUILDING_LIBDYLD
+ // define away restrict until rdar://60166935 is fixed
+ #define restrict
+ #include <subsystem.h>
+#endif
+
+namespace dyld3 {
+
+//////////////////////////// posix wrappers ////////////////////////////////////////
+
+// <rdar://problem/10111032> wrap calls to stat() with check for EAGAIN
+int stat(const char* path, struct stat* buf)
+{
+ int result;
+ do {
+#if BUILDING_DYLD
+ result = ::stat_with_subsystem(path, buf);
+#else
+ result = ::stat(path, buf);
+#endif
+ } while ((result == -1) && ((errno == EAGAIN) || (errno == EINTR)));
+
+ return result;
+}
+
+// <rdar://problem/13805025> dyld should retry open() if it gets an EGAIN
+int open(const char* path, int flag, int other)
+{
+ int result;
+ do {
+#if BUILDING_DYLD
+ if (flag & O_CREAT)
+ result = ::open(path, flag, other);
+ else
+ result = ::open_with_subsystem(path, flag);
+#else
+ result = ::open(path, flag, other);
+#endif
+ } while ((result == -1) && ((errno == EAGAIN) || (errno == EINTR)));
+
+ return result;
+}
+
+
+//////////////////////////// FatFile ////////////////////////////////////////
+
+const FatFile* FatFile::isFatFile(const void* fileStart)
+{
+ const FatFile* fileStartAsFat = (FatFile*)fileStart;
+ if ( (fileStartAsFat->magic == OSSwapBigToHostInt32(FAT_MAGIC)) || (fileStartAsFat->magic == OSSwapBigToHostInt32(FAT_MAGIC_64)) )
+ return fileStartAsFat;
+ else
+ return nullptr;
+}
+
+bool FatFile::isValidSlice(Diagnostics& diag, uint64_t fileLen, uint32_t sliceIndex,
+ uint32_t sliceCpuType, uint32_t sliceCpuSubType, uint64_t sliceOffset, uint64_t sliceLen) const {
+ if ( greaterThanAddOrOverflow(sliceOffset, sliceLen, fileLen) ) {
+ diag.error("slice %d extends beyond end of file", sliceIndex);
+ return false;
+ }
+ const dyld3::MachOFile* mf = (const dyld3::MachOFile*)((uint8_t*)this+sliceOffset);
+ if (!mf->isMachO(diag, sliceLen))
+ return false;
+ if ( mf->cputype != (cpu_type_t)sliceCpuType ) {
+ diag.error("cpu type in slice (0x%08X) does not match fat header (0x%08X)", mf->cputype, sliceCpuType);
+ return false;
+ }
+ else if ( (mf->cpusubtype & ~CPU_SUBTYPE_MASK) != (sliceCpuSubType & ~CPU_SUBTYPE_MASK) ) {
+ diag.error("cpu subtype in slice (0x%08X) does not match fat header (0x%08X)", mf->cpusubtype, sliceCpuSubType);
+ return false;
+ }
+ uint32_t pageSizeMask = mf->uses16KPages() ? 0x3FFF : 0xFFF;
+ if ( (sliceOffset & pageSizeMask) != 0 ) {
+ // slice not page aligned
+ if ( strncmp((char*)this+sliceOffset, "!<arch>", 7) == 0 )
+ diag.error("file is static library");
+ else
+ diag.error("slice is not page aligned");
+ return false;
+ }
+ return true;
+}
+
+void FatFile::forEachSlice(Diagnostics& diag, uint64_t fileLen, bool validate,
+ void (^callback)(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop)) const
+{
+ if ( this->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
+ const uint64_t maxArchs = ((4096 - sizeof(fat_header)) / sizeof(fat_arch));
+ const uint32_t numArchs = OSSwapBigToHostInt32(nfat_arch);
+ if ( numArchs > maxArchs ) {
+ diag.error("fat header too large: %u entries", numArchs);
+ return;
+ }
+ bool stop = false;
+ const fat_arch* const archs = (fat_arch*)(((char*)this)+sizeof(fat_header));
+ for (uint32_t i=0; i < numArchs; ++i) {
+ uint32_t cpuType = OSSwapBigToHostInt32(archs[i].cputype);
+ uint32_t cpuSubType = OSSwapBigToHostInt32(archs[i].cpusubtype);
+ uint32_t offset = OSSwapBigToHostInt32(archs[i].offset);
+ uint32_t len = OSSwapBigToHostInt32(archs[i].size);
+ Diagnostics sliceDiag;
+ if ( !validate || isValidSlice(sliceDiag, fileLen, i, cpuType, cpuSubType, offset, len) )
+ callback(cpuType, cpuSubType, (uint8_t*)this+offset, len, stop);
+ if ( stop )
+ break;
+ if ( sliceDiag.hasError() )
+ diag.appendError("%s, ", sliceDiag.errorMessageCStr());
+ }
+
+ // Look for one more slice
+ if ( numArchs != maxArchs ) {
+ uint32_t cpuType = OSSwapBigToHostInt32(archs[numArchs].cputype);
+ uint32_t cpuSubType = OSSwapBigToHostInt32(archs[numArchs].cpusubtype);
+ uint32_t offset = OSSwapBigToHostInt32(archs[numArchs].offset);
+ uint32_t len = OSSwapBigToHostInt32(archs[numArchs].size);
+ if ((cpuType == CPU_TYPE_ARM64) && ((cpuSubType == CPU_SUBTYPE_ARM64_ALL || cpuSubType == CPU_SUBTYPE_ARM64_V8))) {
+ if ( !validate || isValidSlice(diag, fileLen, numArchs, cpuType, cpuSubType, offset, len) )
+ callback(cpuType, cpuSubType, (uint8_t*)this+offset, len, stop);
+ }
+ }
+ }
+ else if ( this->magic == OSSwapBigToHostInt32(FAT_MAGIC_64) ) {
+ if ( OSSwapBigToHostInt32(nfat_arch) > ((4096 - sizeof(fat_header)) / sizeof(fat_arch)) ) {
+ diag.error("fat header too large: %u entries", OSSwapBigToHostInt32(nfat_arch));
+ return;
+ }
+ bool stop = false;
+ const fat_arch_64* const archs = (fat_arch_64*)(((char*)this)+sizeof(fat_header));
+ for (uint32_t i=0; i < OSSwapBigToHostInt32(nfat_arch); ++i) {
+ uint32_t cpuType = OSSwapBigToHostInt32(archs[i].cputype);
+ uint32_t cpuSubType = OSSwapBigToHostInt32(archs[i].cpusubtype);
+ uint64_t offset = OSSwapBigToHostInt64(archs[i].offset);
+ uint64_t len = OSSwapBigToHostInt64(archs[i].size);
+ if ( !validate || isValidSlice(diag, fileLen, i, cpuType, cpuSubType, offset, len) )
+ callback(cpuType, cpuSubType, (uint8_t*)this+offset, len, stop);
+ if ( stop )
+ break;
+ }
+ }
+ else {
+ diag.error("not a fat file");
+ }
+}
+
+void FatFile::forEachSlice(Diagnostics& diag, uint64_t fileLen, void (^callback)(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop)) const
+{
+ forEachSlice(diag, fileLen, true, callback);
+}
+
+const char* FatFile::archNames(char strBuf[256]) const
+{
+ strBuf[0] = '\0';
+ Diagnostics diag;
+ __block bool needComma = false;
+ this->forEachSlice(diag, 0xFFFFFFFF, false, ^(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop) {
+ if ( needComma )
+ strlcat(strBuf, ",", 256);
+ strlcat(strBuf, MachOFile::archName(sliceCpuType, sliceCpuSubType), 256);
+ needComma = true;
+ });
+ return strBuf;
+}
+
+bool FatFile::isFatFileWithSlice(Diagnostics& diag, uint64_t fileLen, const GradedArchs& archs, bool isOSBinary,
+ uint64_t& sliceOffset, uint64_t& sliceLen, bool& missingSlice) const
+{
+ missingSlice = false;
+ if ( (this->magic != OSSwapBigToHostInt32(FAT_MAGIC)) && (this->magic != OSSwapBigToHostInt32(FAT_MAGIC_64)) )
+ return false;
+
+ __block int bestGrade = 0;
+ forEachSlice(diag, fileLen, ^(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop) {
+ if (int sliceGrade = archs.grade(sliceCpuType, sliceCpuSubType, isOSBinary)) {
+ if ( sliceGrade > bestGrade ) {
+ sliceOffset = (char*)sliceStart - (char*)this;
+ sliceLen = sliceSize;
+ bestGrade = sliceGrade;
+ }
+ }
+ });
+ if ( diag.hasError() )
+ return false;
+
+ if ( bestGrade == 0 )
+ missingSlice = true;
+
+ return (bestGrade != 0);
+}
+
+
+//////////////////////////// GradedArchs ////////////////////////////////////////
+
+
+#define GRADE_i386 CPU_TYPE_I386, CPU_SUBTYPE_I386_ALL, false
+#define GRADE_x86_64 CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_ALL, false
+#define GRADE_x86_64h CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_H, false
+#define GRADE_armv7 CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7, false
+#define GRADE_armv7s CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7S, false
+#define GRADE_armv7k CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7K, false
+#define GRADE_arm64 CPU_TYPE_ARM64, CPU_SUBTYPE_ARM64_ALL, false
+#define GRADE_arm64e CPU_TYPE_ARM64, CPU_SUBTYPE_ARM64E, false
+#define GRADE_arm64e_pb CPU_TYPE_ARM64, CPU_SUBTYPE_ARM64E, true
+#define GRADE_arm64_32 CPU_TYPE_ARM64_32, CPU_SUBTYPE_ARM64_32_V8, false
+
+const GradedArchs GradedArchs::i386 = { {{GRADE_i386, 1}} };
+const GradedArchs GradedArchs::x86_64 = { {{GRADE_x86_64, 1}} };
+const GradedArchs GradedArchs::x86_64h = { {{GRADE_x86_64h, 2}, {GRADE_x86_64, 1}} };
+const GradedArchs GradedArchs::arm64 = { {{GRADE_arm64, 1}} };
+#if SUPPORT_ARCH_arm64e
+const GradedArchs GradedArchs::arm64e_keysoff = { {{GRADE_arm64e, 2}, {GRADE_arm64, 1}} };
+const GradedArchs GradedArchs::arm64e_keysoff_pb = { {{GRADE_arm64e_pb, 2}, {GRADE_arm64, 1}} };
+const GradedArchs GradedArchs::arm64e = { {{GRADE_arm64e, 1}} };
+const GradedArchs GradedArchs::arm64e_pb = { {{GRADE_arm64e_pb, 1}} };
+#endif
+const GradedArchs GradedArchs::armv7 = { {{GRADE_armv7, 1}} };
+const GradedArchs GradedArchs::armv7s = { {{GRADE_armv7s, 2}, {GRADE_armv7, 1}} };
+const GradedArchs GradedArchs::armv7k = { {{GRADE_armv7k, 1}} };
+#if SUPPORT_ARCH_arm64_32
+const GradedArchs GradedArchs::arm64_32 = { {{GRADE_arm64_32, 1}} };
+#endif
+
+int GradedArchs::grade(uint32_t cputype, uint32_t cpusubtype, bool isOSBinary) const
+{
+ for (const CpuGrade* p = _orderedCpuTypes; p->type != 0; ++p) {
+ if ( (p->type == cputype) && (p->subtype == (cpusubtype & ~CPU_SUBTYPE_MASK)) ) {
+ if ( p->osBinary ) {
+ if ( isOSBinary )
+ return p->grade;
+ }
+ else {
+ return p->grade;
+ }
+ }
+ }
+ return 0;
+}
+
+const char* GradedArchs::name() const
+{
+ return MachOFile::archName(_orderedCpuTypes[0].type, _orderedCpuTypes[0].subtype);
+}
+
+bool GradedArchs::checksOSBinary() const
+{
+ for (const CpuGrade* p = _orderedCpuTypes; p->type != 0; ++p) {
+ if ( p->osBinary )
+ return true;
+ }
+ return false;
+}
+
+#if __x86_64__
+static bool isHaswell()
+{
+ // FIXME: figure out a commpage way to check this
+ struct host_basic_info info;
+ mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
+ mach_port_t hostPort = mach_host_self();
+ kern_return_t result = host_info(hostPort, HOST_BASIC_INFO, (host_info_t)&info, &count);
+ mach_port_deallocate(mach_task_self(), hostPort);
+ return (result == KERN_SUCCESS) && (info.cpu_subtype == CPU_SUBTYPE_X86_64_H);
+}
+#endif
+
+const GradedArchs& GradedArchs::forCurrentOS(bool keysOff, bool osBinariesOnly)
+{
+#if __arm64e__
+ if ( osBinariesOnly )
+ return (keysOff ? arm64e_keysoff_pb : arm64e_pb);
+ else
+ return (keysOff ? arm64e_keysoff : arm64e);
+#elif __ARM64_ARCH_8_32__
+ return arm64_32;
+#elif __arm64__
+ return arm64;
+#elif __ARM_ARCH_7K__
+ return armv7k;
+#elif __ARM_ARCH_7S__
+ return armv7s;
+#elif __ARM_ARCH_7A__
+ return armv7;
+#elif __x86_64__
+ #if TARGET_OS_SIMULATOR
+ return x86_64;
+ #else
+ return isHaswell() ? x86_64h : x86_64;
+ #endif
+#elif __i386__
+ return i386;
+#else
+ #error unknown platform
+#endif
+}
+
+const GradedArchs& GradedArchs::forName(const char* archName, bool keysOff)
+{
+ if (strcmp(archName, "x86_64h") == 0 )
+ return x86_64h;
+ else if (strcmp(archName, "x86_64") == 0 )
+ return x86_64;
+#if SUPPORT_ARCH_arm64e
+ else if (strcmp(archName, "arm64e") == 0 )
+ return keysOff ? arm64e_keysoff : arm64e;
+#endif
+ else if (strcmp(archName, "arm64") == 0 )
+ return arm64;
+ else if (strcmp(archName, "armv7k") == 0 )
+ return armv7k;
+ else if (strcmp(archName, "armv7s") == 0 )
+ return armv7s;
+ else if (strcmp(archName, "armv7") == 0 )
+ return armv7;
+#if SUPPORT_ARCH_arm64_32
+ else if (strcmp(archName, "arm64_32") == 0 )
+ return arm64_32;
+#endif
+ else if (strcmp(archName, "i386") == 0 )
+ return i386;
+ assert(0 && "unknown arch name");
+}
+
+
+
+//////////////////////////// MachOFile ////////////////////////////////////////
+
+
+const MachOFile::ArchInfo MachOFile::_s_archInfos[] = {
+ { "x86_64", CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_ALL },
+ { "x86_64h", CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_H },
+ { "i386", CPU_TYPE_I386, CPU_SUBTYPE_I386_ALL },
+ { "arm64", CPU_TYPE_ARM64, CPU_SUBTYPE_ARM64_ALL },
+#if SUPPORT_ARCH_arm64e
+ { "arm64e", CPU_TYPE_ARM64, CPU_SUBTYPE_ARM64E },
+#endif
+#if SUPPORT_ARCH_arm64_32
+ { "arm64_32", CPU_TYPE_ARM64_32, CPU_SUBTYPE_ARM64_32_V8 },
+#endif
+ { "armv7k", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7K },
+ { "armv7s", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7S },
+ { "armv7", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7 }
+};
+
+const MachOFile::PlatformInfo MachOFile::_s_platformInfos[] = {
+ { "macOS", Platform::macOS, LC_VERSION_MIN_MACOSX },
+ { "iOS", Platform::iOS, LC_VERSION_MIN_IPHONEOS },
+ { "tvOS", Platform::tvOS, LC_VERSION_MIN_TVOS },
+ { "watchOS", Platform::watchOS, LC_VERSION_MIN_WATCHOS },
+ { "bridgeOS", Platform::bridgeOS, LC_BUILD_VERSION },
+ { "MacCatalyst", Platform::iOSMac, LC_BUILD_VERSION },
+ { "iOS-sim", Platform::iOS_simulator, LC_BUILD_VERSION },
+ { "tvOS-sim", Platform::tvOS_simulator, LC_BUILD_VERSION },
+ { "watchOS-sim", Platform::watchOS_simulator, LC_BUILD_VERSION },
+ { "driverKit", Platform::driverKit, LC_BUILD_VERSION },
+};
+
+
+
+bool MachOFile::is64() const
+{
+ return (this->magic == MH_MAGIC_64);
+}
+
+size_t MachOFile::machHeaderSize() const
+{
+ return is64() ? sizeof(mach_header_64) : sizeof(mach_header);
+}
+
+uint32_t MachOFile::maskedCpuSubtype() const
+{
+ return (this->cpusubtype & ~CPU_SUBTYPE_MASK);
+}
+
+uint32_t MachOFile::pointerSize() const
+{
+ if (this->magic == MH_MAGIC_64)
+ return 8;
+ else
+ return 4;
+}
+
+bool MachOFile::uses16KPages() const
+{
+ switch (this->cputype) {
+ case CPU_TYPE_ARM64:
+ case CPU_TYPE_ARM64_32:
+ return true;
+ case CPU_TYPE_ARM:
+ // iOS is 16k aligned for armv7/armv7s and watchOS armv7k is 16k aligned
+ return this->cpusubtype == CPU_SUBTYPE_ARM_V7K;
+ default:
+ return false;
+ }
+}
+
+bool MachOFile::isArch(const char* aName) const
+{
+ return (strcmp(aName, archName(this->cputype, this->cpusubtype)) == 0);
+}
+
+const char* MachOFile::archName(uint32_t cputype, uint32_t cpusubtype)
+{
+ for (const ArchInfo& info : _s_archInfos) {
+ if ( (cputype == info.cputype) && ((cpusubtype & ~CPU_SUBTYPE_MASK) == info.cpusubtype) ) {
+ return info.name;
+ }
+ }
+ return "unknown";
+}
+
+uint32_t MachOFile::cpuTypeFromArchName(const char* archName)
+{
+ for (const ArchInfo& info : _s_archInfos) {
+ if ( strcmp(archName, info.name) == 0 ) {
+ return info.cputype;
+ }
+ }
+ return 0;
+}
+
+uint32_t MachOFile::cpuSubtypeFromArchName(const char* archName)
+{
+ for (const ArchInfo& info : _s_archInfos) {
+ if ( strcmp(archName, info.name) == 0 ) {
+ return info.cpusubtype;
+ }
+ }
+ return 0;
+}
+
+const char* MachOFile::archName() const
+{
+ return archName(this->cputype, this->cpusubtype);
+}
+
+static void appendDigit(char*& s, unsigned& num, unsigned place, bool& startedPrinting)
+{
+ if ( num >= place ) {
+ unsigned dig = (num/place);
+ *s++ = '0' + dig;
+ num -= (dig*place);
+ startedPrinting = true;
+ }
+ else if ( startedPrinting ) {
+ *s++ = '0';
+ }
+}
+
+static void appendNumber(char*& s, unsigned num)
+{
+ assert(num < 99999);
+ bool startedPrinting = false;
+ appendDigit(s, num, 10000, startedPrinting);
+ appendDigit(s, num, 1000, startedPrinting);
+ appendDigit(s, num, 100, startedPrinting);
+ appendDigit(s, num, 10, startedPrinting);
+ appendDigit(s, num, 1, startedPrinting);
+ if ( !startedPrinting )
+ *s++ = '0';
+}
+
+void MachOFile::packedVersionToString(uint32_t packedVersion, char versionString[32])
+{
+ // sprintf(versionString, "%d.%d.%d", (packedVersion >> 16), ((packedVersion >> 8) & 0xFF), (packedVersion & 0xFF));
+ char* s = versionString;
+ appendNumber(s, (packedVersion >> 16));
+ *s++ = '.';
+ appendNumber(s, (packedVersion >> 8) & 0xFF);
+ *s++ = '.';
+ appendNumber(s, (packedVersion & 0xFF));
+ *s++ = '\0';
+}
+
+bool MachOFile::builtForPlatform(Platform reqPlatform, bool onlyOnePlatform) const
+{
+ __block bool foundRequestedPlatform = false;
+ __block bool foundOtherPlatform = false;
+ forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) {
+ if ( platform == reqPlatform )
+ foundRequestedPlatform = true;
+ else
+ foundOtherPlatform = true;
+ });
+ // if checking that this binary is built for exactly one platform, fail if more
+ if ( foundOtherPlatform && onlyOnePlatform )
+ return false;
+ if ( foundRequestedPlatform )
+ return true;
+
+ // binary has no explict load command to mark platform
+ // could be an old macOS binary, look at arch
+ if ( !foundOtherPlatform && (reqPlatform == Platform::macOS) ) {
+ if ( this->cputype == CPU_TYPE_X86_64 )
+ return true;
+ if ( this->cputype == CPU_TYPE_I386 )
+ return true;
+ }
+
+#if BUILDING_DYLDINFO
+ // Allow offline tools to analyze binaries dyld doesn't load, ie, those with platforms
+ if ( !foundOtherPlatform && (reqPlatform == Platform::unknown) )
+ return true;
+#endif
+
+ return false;
+}
+
+bool MachOFile::loadableIntoProcess(Platform processPlatform, const char* path) const
+{
+ if ( this->builtForPlatform(processPlatform) )
+ return true;
+
+ // Some host macOS dylibs can be loaded into simulator processes
+ if ( MachOFile::isSimulatorPlatform(processPlatform) && this->builtForPlatform(Platform::macOS)) {
+ static const char* const macOSHost[] = {
+ "/usr/lib/system/libsystem_kernel.dylib",
+ "/usr/lib/system/libsystem_platform.dylib",
+ "/usr/lib/system/libsystem_pthread.dylib",
+ "/usr/lib/system/libsystem_platform_debug.dylib",
+ "/usr/lib/system/libsystem_pthread_debug.dylib",
+ "/usr/lib/system/host/liblaunch_sim.dylib",
+ };
+ for (const char* libPath : macOSHost) {
+ if (strcmp(libPath, path) == 0)
+ return true;
+ }
+ }
+
+ // If this is being called on main executable where we expect a macOS program, Catalyst programs are also runnable
+ if ( (this->filetype == MH_EXECUTE) && (processPlatform == Platform::macOS) && this->builtForPlatform(Platform::iOSMac, true) )
+ return true;
+#if (TARGET_OS_OSX && TARGET_CPU_ARM64)
+ if ( (this->filetype == MH_EXECUTE) && (processPlatform == Platform::macOS) && this->builtForPlatform(Platform::iOS, true) )
+ return true;
+#endif
+
+ bool iOSonMac = (processPlatform == Platform::iOSMac);
+#if (TARGET_OS_OSX && TARGET_CPU_ARM64)
+ // allow iOS binaries in iOSApp
+ if ( processPlatform == Platform::iOS ) {
+ // can load Catalyst binaries into iOS process
+ if ( this->builtForPlatform(Platform::iOSMac) )
+ return true;
+ iOSonMac = true;
+ }
+#endif
+ // macOS dylibs can be loaded into iOSMac processes
+ if ( (iOSonMac) && this->builtForPlatform(Platform::macOS, true) )
+ return true;
+
+
+ return false;
+}
+
+bool MachOFile::isZippered() const
+{
+ __block bool macOS = false;
+ __block bool iOSMac = false;
+ forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) {
+ if ( platform == Platform::macOS )
+ macOS = true;
+ else if ( platform == Platform::iOSMac )
+ iOSMac = true;
+ });
+ return macOS && iOSMac;
+}
+
+bool MachOFile::inDyldCache() const {
+ return (this->flags & MH_DYLIB_IN_CACHE);
+}
+
+Platform MachOFile::currentPlatform()
+{
+#if TARGET_OS_SIMULATOR
+ #if TARGET_OS_WATCH
+ return Platform::watchOS_simulator;
+ #elif TARGET_OS_TV
+ return Platform::tvOS_simulator;
+ #else
+ return Platform::iOS_simulator;
+ #endif
+#elif TARGET_OS_BRIDGE
+ return Platform::bridgeOS;
+#elif TARGET_OS_WATCH
+ return Platform::watchOS;
+#elif TARGET_OS_TV
+ return Platform::tvOS;
+#elif TARGET_OS_IOS
+ return Platform::iOS;
+#elif TARGET_OS_OSX
+ return Platform::macOS;
+#elif TARGET_OS_DRIVERKIT
+ return Platform::driverKit;
+#else
+ #error unknown platform
+#endif
+}
+
+Platform MachOFile::basePlatform(dyld3::Platform reqPlatform) {
+ switch(reqPlatform) {
+ case Platform::unknown: return Platform::unknown;
+ case Platform::macOS: return Platform::macOS;
+ case Platform::iOS: return Platform::iOS;
+ case Platform::tvOS: return Platform::tvOS;
+ case Platform::watchOS: return Platform::watchOS;
+ case Platform::bridgeOS: return Platform::bridgeOS;
+ case Platform::iOSMac: return Platform::iOS;
+ case Platform::iOS_simulator: return Platform::iOS;
+ case Platform::tvOS_simulator: return Platform::tvOS;
+ case Platform::watchOS_simulator: return Platform::watchOS;
+ case Platform::driverKit: return Platform::driverKit;
+ default: return Platform::unknown;
+ }
+}
+
+
+const char* MachOFile::currentArchName()
+{
+#if __ARM_ARCH_7K__
+ return "armv7k";
+#elif __ARM_ARCH_7A__
+ return "armv7";
+#elif __ARM_ARCH_7S__
+ return "armv7s";
+#elif __arm64e__
+ return "arm64e";
+#elif __arm64__
+#if __LP64__
+ return "arm64";
+#else
+ return "arm64_32";
+#endif
+#elif __x86_64__
+ return isHaswell() ? "x86_64h" : "x86_64";
+#elif __i386__
+ return "i386";
+#else
+ #error unknown arch
+#endif
+}
+
+bool MachOFile::isSimulatorPlatform(Platform platform, Platform* basePlatform)
+{
+ switch ( platform ) {
+ case Platform::iOS_simulator:
+ if ( basePlatform )
+ *basePlatform = Platform::iOS;
+ return true;
+ case Platform::watchOS_simulator:
+ if ( basePlatform )
+ *basePlatform = Platform::watchOS;
+ return true;
+ case Platform::tvOS_simulator:
+ if ( basePlatform )
+ *basePlatform = Platform::tvOS;
+ return true;
+ default:
+ return false;
+ }
+}
+
+bool MachOFile::isDyldManaged() const {
+ switch ( this->filetype ) {
+ case MH_BUNDLE:
+ case MH_EXECUTE:
+ case MH_DYLIB:
+ return true;
+ default:
+ break;
+ }
+ return false;
+}
+
+bool MachOFile::isDylib() const
+{
+ return (this->filetype == MH_DYLIB);
+}
+
+bool MachOFile::isBundle() const
+{
+ return (this->filetype == MH_BUNDLE);
+}
+
+bool MachOFile::isMainExecutable() const
+{
+ return (this->filetype == MH_EXECUTE);
+}
+
+bool MachOFile::isDynamicExecutable() const
+{
+ if ( this->filetype != MH_EXECUTE )
+ return false;
+
+ // static executables do not have dyld load command
+ return hasLoadCommand(LC_LOAD_DYLINKER);
+}
+
+bool MachOFile::isStaticExecutable() const
+{
+ if ( this->filetype != MH_EXECUTE )
+ return false;
+
+ // static executables do not have dyld load command
+ return !hasLoadCommand(LC_LOAD_DYLINKER);
+}
+
+bool MachOFile::isKextBundle() const
+{
+ return (this->filetype == MH_KEXT_BUNDLE);
+}
+
+bool MachOFile::isFileSet() const
+{
+ return (this->filetype == MH_FILESET);
+}
+
+bool MachOFile::isPIE() const
+{
+ return (this->flags & MH_PIE);
+}
+
+bool MachOFile::isPreload() const
+{
+ return (this->filetype == MH_PRELOAD);
+}
+
+const char* MachOFile::platformName(Platform reqPlatform)
+{
+ for (const PlatformInfo& info : _s_platformInfos) {
+ if ( info.platform == reqPlatform )
+ return info.name;
+ }
+ return "unknown";
+}
+
+void MachOFile::forEachSupportedPlatform(void (^handler)(Platform platform, uint32_t minOS, uint32_t sdk)) const
+{
+ Diagnostics diag;
+ __block bool foundPlatform = false;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ const build_version_command* buildCmd = (build_version_command *)cmd;
+ const version_min_command* versCmd = (version_min_command*)cmd;
+ uint32_t sdk;
+ switch ( cmd->cmd ) {
+ case LC_BUILD_VERSION:
+ handler((Platform)(buildCmd->platform), buildCmd->minos, buildCmd->sdk);
+ foundPlatform = true;
+ break;
+ case LC_VERSION_MIN_MACOSX:
+ sdk = versCmd->sdk;
+ // The original LC_VERSION_MIN_MACOSX did not have an sdk field, assume sdk is same as minOS for those old binaries
+ if ( sdk == 0 )
+ sdk = versCmd->version;
+ handler(Platform::macOS, versCmd->version, sdk);
+ foundPlatform = true;
+ break;
+ case LC_VERSION_MIN_IPHONEOS:
+ if ( (this->cputype == CPU_TYPE_X86_64) || (this->cputype == CPU_TYPE_I386) )
+ handler(Platform::iOS_simulator, versCmd->version, versCmd->sdk); // old sim binary
+ else
+ handler(Platform::iOS, versCmd->version, versCmd->sdk);
+ foundPlatform = true;
+ break;
+ case LC_VERSION_MIN_TVOS:
+ if ( this->cputype == CPU_TYPE_X86_64 )
+ handler(Platform::tvOS_simulator, versCmd->version, versCmd->sdk); // old sim binary
+ else
+ handler(Platform::tvOS, versCmd->version, versCmd->sdk);
+ foundPlatform = true;
+ break;
+ case LC_VERSION_MIN_WATCHOS:
+ if ( (this->cputype == CPU_TYPE_X86_64) || (this->cputype == CPU_TYPE_I386) )
+ handler(Platform::watchOS_simulator, versCmd->version, versCmd->sdk); // old sim binary
+ else
+ handler(Platform::watchOS, versCmd->version, versCmd->sdk);
+ foundPlatform = true;
+ break;
+ }
+ });
+ if ( !foundPlatform ) {
+ // old binary with no explicit platform
+#if (BUILDING_DYLD || BUILDING_CLOSURE_UTIL) && TARGET_OS_OSX
+ if ( this->cputype == CPU_TYPE_X86_64 )
+ handler(Platform::macOS, 0x000A0500, 0x000A0500); // guess it is a macOS 10.5 binary
+ // <rdar://problem/75343399>
+ // The Go linker emits non-standard binaries without a platform and we have to live with it.
+ if ( this->cputype == CPU_TYPE_ARM64 )
+ handler(Platform::macOS, 0x000B0000, 0x000B0000); // guess it is a macOS 11.0 binary
+#endif
+ }
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+}
+
+
+bool MachOFile::isMachO(Diagnostics& diag, uint64_t fileSize) const
+{
+ if ( !hasMachOMagic() ) {
+ // old PPC slices are not currently valid "mach-o" but should not cause an error
+ if ( !hasMachOBigEndianMagic() )
+ diag.error("file does not start with MH_MAGIC[_64]");
+ return false;
+ }
+ if ( this->sizeofcmds + machHeaderSize() > fileSize ) {
+ diag.error("load commands exceed length of first segment");
+ return false;
+ }
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { });
+ return diag.noError();
+}
+
+bool MachOFile::hasMachOMagic() const
+{
+ return ( (this->magic == MH_MAGIC) || (this->magic == MH_MAGIC_64) );
+}
+
+bool MachOFile::hasMachOBigEndianMagic() const
+{
+ return ( (this->magic == MH_CIGAM) || (this->magic == MH_CIGAM_64) );
+}
+
+
+void MachOFile::forEachLoadCommand(Diagnostics& diag, void (^callback)(const load_command* cmd, bool& stop)) const
+{
+ bool stop = false;
+ const load_command* startCmds = nullptr;
+ if ( this->magic == MH_MAGIC_64 )
+ startCmds = (load_command*)((char *)this + sizeof(mach_header_64));
+ else if ( this->magic == MH_MAGIC )
+ startCmds = (load_command*)((char *)this + sizeof(mach_header));
+ else if ( hasMachOBigEndianMagic() )
+ return; // can't process big endian mach-o
+ else {
+ const uint32_t* h = (uint32_t*)this;
+ diag.error("file does not start with MH_MAGIC[_64]: 0x%08X 0x%08X", h[0], h [1]);
+ return; // not a mach-o file
+ }
+ const load_command* const cmdsEnd = (load_command*)((char*)startCmds + this->sizeofcmds);
+ const load_command* cmd = startCmds;
+ for (uint32_t i = 0; i < this->ncmds; ++i) {
+ const load_command* nextCmd = (load_command*)((char *)cmd + cmd->cmdsize);
+ if ( cmd->cmdsize < 8 ) {
+ diag.error("malformed load command #%d of %d at %p with mh=%p, size (0x%X) too small", i, this->ncmds, cmd, this, cmd->cmdsize);
+ return;
+ }
+ // FIXME: add check the cmdsize is pointer aligned (might reveal bin compat issues)
+ if ( (nextCmd > cmdsEnd) || (nextCmd < startCmds) ) {
+ diag.error("malformed load command #%d of %d at %p with mh=%p, size (0x%X) is too large, load commands end at %p", i, this->ncmds, cmd, this, cmd->cmdsize, cmdsEnd);
+ return;
+ }
+ callback(cmd, stop);
+ if ( stop )
+ return;
+ cmd = nextCmd;
+ }
+}
+
+void MachOFile::removeLoadCommand(Diagnostics& diag, void (^callback)(const load_command* cmd, bool& remove, bool& stop))
+{
+ bool stop = false;
+ const load_command* startCmds = nullptr;
+ if ( this->magic == MH_MAGIC_64 )
+ startCmds = (load_command*)((char *)this + sizeof(mach_header_64));
+ else if ( this->magic == MH_MAGIC )
+ startCmds = (load_command*)((char *)this + sizeof(mach_header));
+ else if ( hasMachOBigEndianMagic() )
+ return; // can't process big endian mach-o
+ else {
+ const uint32_t* h = (uint32_t*)this;
+ diag.error("file does not start with MH_MAGIC[_64]: 0x%08X 0x%08X", h[0], h [1]);
+ return; // not a mach-o file
+ }
+ const load_command* const cmdsEnd = (load_command*)((char*)startCmds + this->sizeofcmds);
+ auto cmd = (load_command*)startCmds;
+ const uint32_t origNcmds = this->ncmds;
+ unsigned bytesRemaining = this->sizeofcmds;
+ for (uint32_t i = 0; i < origNcmds; ++i) {
+ bool remove = false;
+ auto nextCmd = (load_command*)((char *)cmd + cmd->cmdsize);
+ if ( cmd->cmdsize < 8 ) {
+ diag.error("malformed load command #%d of %d at %p with mh=%p, size (0x%X) too small", i, this->ncmds, cmd, this, cmd->cmdsize);
+ return;
+ }
+ if ( (nextCmd > cmdsEnd) || (nextCmd < startCmds) ) {
+ diag.error("malformed load command #%d of %d at %p with mh=%p, size (0x%X) is too large, load commands end at %p", i, this->ncmds, cmd, this, cmd->cmdsize, cmdsEnd);
+ return;
+ }
+ callback(cmd, remove, stop);
+ if ( remove ) {
+ this->sizeofcmds -= cmd->cmdsize;
+ ::memmove((void*)cmd, (void*)nextCmd, bytesRemaining);
+ this->ncmds--;
+ } else {
+ bytesRemaining -= cmd->cmdsize;
+ cmd = nextCmd;
+ }
+ if ( stop )
+ break;
+ }
+ if ( cmd )
+ ::bzero(cmd, bytesRemaining);
+}
+
+const char* MachOFile::installName() const
+{
+ const char* name;
+ uint32_t compatVersion;
+ uint32_t currentVersion;
+ if ( getDylibInstallName(&name, &compatVersion, ¤tVersion) )
+ return name;
+ return nullptr;
+}
+
+bool MachOFile::getDylibInstallName(const char** installName, uint32_t* compatVersion, uint32_t* currentVersion) const
+{
+ Diagnostics diag;
+ __block bool found = false;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_ID_DYLIB ) {
+ const dylib_command* dylibCmd = (dylib_command*)cmd;
+ *compatVersion = dylibCmd->dylib.compatibility_version;
+ *currentVersion = dylibCmd->dylib.current_version;
+ *installName = (char*)dylibCmd + dylibCmd->dylib.name.offset;
+ found = true;
+ stop = true;
+ }
+ });
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+ return found;
+}
+
+bool MachOFile::getUuid(uuid_t uuid) const
+{
+ Diagnostics diag;
+ __block bool found = false;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_UUID ) {
+ const uuid_command* uc = (const uuid_command*)cmd;
+ memcpy(uuid, uc->uuid, sizeof(uuid_t));
+ found = true;
+ stop = true;
+ }
+ });
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+ if ( !found )
+ bzero(uuid, sizeof(uuid_t));
+ return found;
+}
+
+void MachOFile::forEachDependentDylib(void (^callback)(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop)) const
+{
+ Diagnostics diag;
+ __block unsigned count = 0;
+ __block bool stopped = false;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ switch ( cmd->cmd ) {
+ case LC_LOAD_DYLIB:
+ case LC_LOAD_WEAK_DYLIB:
+ case LC_REEXPORT_DYLIB:
+ case LC_LOAD_UPWARD_DYLIB: {
+ const dylib_command* dylibCmd = (dylib_command*)cmd;
+ const char* loadPath = (char*)dylibCmd + dylibCmd->dylib.name.offset;
+ callback(loadPath, (cmd->cmd == LC_LOAD_WEAK_DYLIB), (cmd->cmd == LC_REEXPORT_DYLIB), (cmd->cmd == LC_LOAD_UPWARD_DYLIB),
+ dylibCmd->dylib.compatibility_version, dylibCmd->dylib.current_version, stop);
+ ++count;
+ if ( stop )
+ stopped = true;
+ }
+ break;
+ }
+ });
+ // everything must link with something
+ if ( (count == 0) && !stopped ) {
+ // The dylibs that make up libSystem can link with nothing
+ // except for dylibs in libSystem.dylib which are ok to link with nothing (they are on bottom)
+ if ( this->builtForPlatform(Platform::driverKit, true) ) {
+ if ( !this->isDylib() || (strncmp(this->installName(), "/System/DriverKit/usr/lib/system/", 33) != 0) )
+ callback("/System/DriverKit/usr/lib/libSystem.B.dylib", false, false, false, 0x00010000, 0x00010000, stopped);
+ }
+ else {
+ if ( !this->isDylib() || (strncmp(this->installName(), "/usr/lib/system/", 16) != 0) )
+ callback("/usr/lib/libSystem.B.dylib", false, false, false, 0x00010000, 0x00010000, stopped);
+ }
+ }
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+}
+
+void MachOFile::forDyldEnv(void (^callback)(const char* envVar, bool& stop)) const
+{
+ Diagnostics diag;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_DYLD_ENVIRONMENT ) {
+ const dylinker_command* envCmd = (dylinker_command*)cmd;
+ const char* keyEqualsValue = (char*)envCmd + envCmd->name.offset;
+ // only process variables that start with DYLD_ and end in _PATH
+ if ( (strncmp(keyEqualsValue, "DYLD_", 5) == 0) ) {
+ const char* equals = strchr(keyEqualsValue, '=');
+ if ( equals != NULL ) {
+ if ( strncmp(&equals[-5], "_PATH", 5) == 0 ) {
+ callback(keyEqualsValue, stop);
+ }
+ }
+ }
+ }
+ });
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+}
+
+bool MachOFile::enforceCompatVersion() const
+{
+ __block bool result = true;
+ forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) {
+ switch ( platform ) {
+ case Platform::macOS:
+ if ( minOS >= 0x000A0E00 ) // macOS 10.14
+ result = false;
+ break;
+ case Platform::iOS:
+ case Platform::tvOS:
+ case Platform::iOS_simulator:
+ case Platform::tvOS_simulator:
+ if ( minOS >= 0x000C0000 ) // iOS 12.0
+ result = false;
+ break;
+ case Platform::watchOS:
+ case Platform::watchOS_simulator:
+ if ( minOS >= 0x00050000 ) // watchOS 5.0
+ result = false;
+ break;
+ case Platform::bridgeOS:
+ if ( minOS >= 0x00030000 ) // bridgeOS 3.0
+ result = false;
+ break;
+ case Platform::driverKit:
+ case Platform::iOSMac:
+ result = false;
+ break;
+ case Platform::unknown:
+ break;
+ }
+ });
+ return result;
+}
+
+const thread_command* MachOFile::unixThreadLoadCommand() const {
+ Diagnostics diag;
+ __block const thread_command* command = nullptr;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_UNIXTHREAD ) {
+ command = (const thread_command*)cmd;
+ stop = true;
+ }
+ });
+ return command;
+}
+
+
+uint32_t MachOFile::entryAddrRegisterIndexForThreadCmd() const
+{
+ switch ( this->cputype ) {
+ case CPU_TYPE_I386:
+ return 10; // i386_thread_state_t.eip
+ case CPU_TYPE_X86_64:
+ return 16; // x86_thread_state64_t.rip
+ case CPU_TYPE_ARM:
+ return 15; // arm_thread_state_t.pc
+ case CPU_TYPE_ARM64:
+ return 32; // arm_thread_state64_t.__pc
+ }
+ return ~0U;
+}
+
+
+uint64_t MachOFile::entryAddrFromThreadCmd(const thread_command* cmd) const
+{
+ assert(cmd->cmd == LC_UNIXTHREAD);
+ const uint32_t* regs32 = (uint32_t*)(((char*)cmd) + 16);
+ const uint64_t* regs64 = (uint64_t*)(((char*)cmd) + 16);
+
+ uint32_t index = entryAddrRegisterIndexForThreadCmd();
+ if (index == ~0U)
+ return 0;
+
+ return is64() ? regs64[index] : regs32[index];
+}
+
+
+void MachOFile::forEachSegment(void (^callback)(const SegmentInfo& info, bool& stop)) const
+{
+ Diagnostics diag;
+ const bool intel32 = (this->cputype == CPU_TYPE_I386);
+ __block uint32_t segIndex = 0;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_SEGMENT_64 ) {
+ const segment_command_64* segCmd = (segment_command_64*)cmd;
+ uint64_t sizeOfSections = segCmd->vmsize;
+ uint8_t p2align = 0;
+ const section_64* const sectionsStart = (section_64*)((char*)segCmd + sizeof(struct segment_command_64));
+ const section_64* const sectionsEnd = §ionsStart[segCmd->nsects];
+ for (const section_64* sect=sectionsStart; sect < sectionsEnd; ++sect) {
+ sizeOfSections = sect->addr + sect->size - segCmd->vmaddr;
+ if ( sect->align > p2align )
+ p2align = sect->align;
+ }
+ SegmentInfo info;
+ info.fileOffset = segCmd->fileoff;
+ info.fileSize = segCmd->filesize;
+ info.vmAddr = segCmd->vmaddr;
+ info.vmSize = segCmd->vmsize;
+ info.sizeOfSections = sizeOfSections;
+ info.segName = segCmd->segname;
+ info.loadCommandOffset = (uint32_t)((uint8_t*)segCmd - (uint8_t*)this);
+ info.protections = segCmd->initprot;
+ info.textRelocs = false;
+ info.readOnlyData = ((segCmd->flags & SG_READ_ONLY) != 0);
+ info.isProtected = (segCmd->flags & SG_PROTECTED_VERSION_1) ? 1 : 0;
+ info.hasZeroFill = (segCmd->initprot == 3) && (segCmd->filesize < segCmd->vmsize);
+ info.p2align = p2align;
+ info.segIndex = segIndex;
+ callback(info, stop);
+ ++segIndex;
+ }
+ else if ( cmd->cmd == LC_SEGMENT ) {
+ const segment_command* segCmd = (segment_command*)cmd;
+ uint64_t sizeOfSections = segCmd->vmsize;
+ uint8_t p2align = 0;
+ bool hasTextRelocs = false;
+ const section* const sectionsStart = (section*)((char*)segCmd + sizeof(struct segment_command));
+ const section* const sectionsEnd = §ionsStart[segCmd->nsects];
+ for (const section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
+ sizeOfSections = sect->addr + sect->size - segCmd->vmaddr;
+ if ( sect->align > p2align )
+ p2align = sect->align;
+ if ( sect->flags & (S_ATTR_EXT_RELOC|S_ATTR_LOC_RELOC) )
+ hasTextRelocs = true;
+ }
+ SegmentInfo info;
+ info.fileOffset = segCmd->fileoff;
+ info.fileSize = segCmd->filesize;
+ info.vmAddr = segCmd->vmaddr;
+ info.vmSize = segCmd->vmsize;
+ info.sizeOfSections = sizeOfSections;
+ info.segName = segCmd->segname;
+ info.loadCommandOffset = (uint32_t)((uint8_t*)segCmd - (uint8_t*)this);
+ info.protections = segCmd->initprot;
+ info.textRelocs = intel32 && !info.writable() && hasTextRelocs;
+ info.readOnlyData = ((segCmd->flags & SG_READ_ONLY) != 0);
+ info.isProtected = (segCmd->flags & SG_PROTECTED_VERSION_1) ? 1 : 0;
+ info.hasZeroFill = (segCmd->initprot == 3) && (segCmd->filesize < segCmd->vmsize);
+ info.p2align = p2align;
+ info.segIndex = segIndex;
+ callback(info, stop);
+ ++segIndex;
+ }
+ });
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+}
+
+uint64_t MachOFile::preferredLoadAddress() const
+{
+ __block uint64_t textVmAddr = 0;
+ forEachSegment(^(const SegmentInfo& info, bool& stop) {
+ if ( strcmp(info.segName, "__TEXT") == 0 ) {
+ textVmAddr = info.vmAddr;
+ stop = true;
+ }
+ });
+ return textVmAddr;
+}
+
+void MachOFile::forEachSection(void (^callback)(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop)) const
+{
+ Diagnostics diag;
+ BLOCK_ACCCESSIBLE_ARRAY(char, sectNameCopy, 20); // read as: char sectNameCopy[20];
+ const bool intel32 = (this->cputype == CPU_TYPE_I386);
+ __block uint32_t segIndex = 0;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ SectionInfo sectInfo;
+ if ( cmd->cmd == LC_SEGMENT_64 ) {
+ const segment_command_64* segCmd = (segment_command_64*)cmd;
+ uint64_t sizeOfSections = segCmd->vmsize;
+ uint8_t p2align = 0;
+ const section_64* const sectionsStart = (section_64*)((char*)segCmd + sizeof(struct segment_command_64));
+ const section_64* const sectionsEnd = §ionsStart[segCmd->nsects];
+ for (const section_64* sect=sectionsStart; sect < sectionsEnd; ++sect) {
+ sizeOfSections = sect->addr + sect->size - segCmd->vmaddr;
+ if ( sect->align > p2align )
+ p2align = sect->align;
+ }
+ sectInfo.segInfo.fileOffset = segCmd->fileoff;
+ sectInfo.segInfo.fileSize = segCmd->filesize;
+ sectInfo.segInfo.vmAddr = segCmd->vmaddr;
+ sectInfo.segInfo.vmSize = segCmd->vmsize;
+ sectInfo.segInfo.sizeOfSections = sizeOfSections;
+ sectInfo.segInfo.segName = segCmd->segname;
+ sectInfo.segInfo.loadCommandOffset = (uint32_t)((uint8_t*)segCmd - (uint8_t*)this);
+ sectInfo.segInfo.protections = segCmd->initprot;
+ sectInfo.segInfo.textRelocs = false;
+ sectInfo.segInfo.readOnlyData = ((segCmd->flags & SG_READ_ONLY) != 0);
+ sectInfo.segInfo.isProtected = (segCmd->flags & SG_PROTECTED_VERSION_1) ? 1 : 0;
+ sectInfo.segInfo.p2align = p2align;
+ sectInfo.segInfo.segIndex = segIndex;
+ for (const section_64* sect=sectionsStart; !stop && (sect < sectionsEnd); ++sect) {
+ const char* sectName = sect->sectname;
+ if ( sectName[15] != '\0' ) {
+ strlcpy(sectNameCopy, sectName, 17);
+ sectName = sectNameCopy;
+ }
+ bool malformedSectionRange = (sect->addr < segCmd->vmaddr) || greaterThanAddOrOverflow(sect->addr, sect->size, segCmd->vmaddr + segCmd->filesize);
+ sectInfo.sectName = sectName;
+ sectInfo.sectFileOffset = sect->offset;
+ sectInfo.sectFlags = sect->flags;
+ sectInfo.sectAddr = sect->addr;
+ sectInfo.sectSize = sect->size;
+ sectInfo.sectAlignP2 = sect->align;
+ sectInfo.reserved1 = sect->reserved1;
+ sectInfo.reserved2 = sect->reserved2;
+ callback(sectInfo, malformedSectionRange, stop);
+ }
+ ++segIndex;
+ }
+ else if ( cmd->cmd == LC_SEGMENT ) {
+ const segment_command* segCmd = (segment_command*)cmd;
+ uint64_t sizeOfSections = segCmd->vmsize;
+ uint8_t p2align = 0;
+ bool hasTextRelocs = false;
+ const section* const sectionsStart = (section*)((char*)segCmd + sizeof(struct segment_command));
+ const section* const sectionsEnd = §ionsStart[segCmd->nsects];
+ for (const section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
+ sizeOfSections = sect->addr + sect->size - segCmd->vmaddr;
+ if ( sect->align > p2align )
+ p2align = sect->align;
+ if ( sect->flags & (S_ATTR_EXT_RELOC|S_ATTR_LOC_RELOC) )
+ hasTextRelocs = true;
+ }
+ sectInfo.segInfo.fileOffset = segCmd->fileoff;
+ sectInfo.segInfo.fileSize = segCmd->filesize;
+ sectInfo.segInfo.vmAddr = segCmd->vmaddr;
+ sectInfo.segInfo.vmSize = segCmd->vmsize;
+ sectInfo.segInfo.sizeOfSections = sizeOfSections;
+ sectInfo.segInfo.segName = segCmd->segname;
+ sectInfo.segInfo.loadCommandOffset = (uint32_t)((uint8_t*)segCmd - (uint8_t*)this);
+ sectInfo.segInfo.protections = segCmd->initprot;
+ sectInfo.segInfo.textRelocs = intel32 && !sectInfo.segInfo.writable() && hasTextRelocs;
+ sectInfo.segInfo.readOnlyData = ((segCmd->flags & SG_READ_ONLY) != 0);
+ sectInfo.segInfo.isProtected = (segCmd->flags & SG_PROTECTED_VERSION_1) ? 1 : 0;
+ sectInfo.segInfo.p2align = p2align;
+ sectInfo.segInfo.segIndex = segIndex;
+ for (const section* sect=sectionsStart; !stop && (sect < sectionsEnd); ++sect) {
+ const char* sectName = sect->sectname;
+ if ( sectName[15] != '\0' ) {
+ strlcpy(sectNameCopy, sectName, 17);
+ sectName = sectNameCopy;
+ }
+ bool malformedSectionRange = (sect->addr < segCmd->vmaddr) || greaterThanAddOrOverflow(sect->addr, sect->size, segCmd->vmaddr + segCmd->filesize);
+ sectInfo.sectName = sectName;
+ sectInfo.sectFileOffset = sect->offset;
+ sectInfo.sectFlags = sect->flags;
+ sectInfo.sectAddr = sect->addr;
+ sectInfo.sectSize = sect->size;
+ sectInfo.sectAlignP2 = sect->align;
+ sectInfo.reserved1 = sect->reserved1;
+ sectInfo.reserved2 = sect->reserved2;
+ callback(sectInfo, malformedSectionRange, stop);
+ }
+ ++segIndex;
+ }
+ });
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+}
+
+void MachOFile::forEachInterposingSection(Diagnostics& diag, void (^handler)(uint64_t vmOffset, uint64_t vmSize, bool& stop)) const
+{
+ const unsigned ptrSize = pointerSize();
+ const unsigned entrySize = 2 * ptrSize;
+ forEachSection(^(const MachOFile::SectionInfo& info, bool malformedSectionRange, bool &stop) {
+ if ( ((info.sectFlags & SECTION_TYPE) == S_INTERPOSING) || ((strcmp(info.sectName, "__interpose") == 0) && ((strncmp(info.segInfo.segName, "__DATA", 6) == 0) || strncmp(info.segInfo.segName, "__AUTH", 6) == 0)) ) {
+ if ( info.sectSize % entrySize != 0 ) {
+ diag.error("interposing section %s/%s has bad size", info.segInfo.segName, info.sectName);
+ stop = true;
+ return;
+ }
+ if ( malformedSectionRange ) {
+ diag.error("interposing section %s/%s extends beyond the end of the segment", info.segInfo.segName, info.sectName);
+ stop = true;
+ return;
+ }
+ if ( (info.sectAddr % ptrSize) != 0 ) {
+ diag.error("interposing section %s/%s is not pointer aligned", info.segInfo.segName, info.sectName);
+ stop = true;
+ return;
+ }
+ handler(info.sectAddr - preferredLoadAddress(), info.sectSize, stop);
+ }
+ });
+}
+
+bool MachOFile::isRestricted() const
+{
+ __block bool result = false;
+ forEachSection(^(const MachOFile::SectionInfo& info, bool malformedSectionRange, bool &stop) {
+ if ( (strcmp(info.segInfo.segName, "__RESTRICT") == 0) && (strcmp(info.sectName, "__restrict") == 0) ) {
+ result = true;
+ stop = true;
+ }
+ });
+ return result;
+}
+
+bool MachOFile::hasWeakDefs() const
+{
+ return (this->flags & MH_WEAK_DEFINES);
+}
+
+bool MachOFile::usesWeakDefs() const
+{
+ return (this->flags & MH_BINDS_TO_WEAK);
+}
+
+bool MachOFile::hasThreadLocalVariables() const
+{
+ return (this->flags & MH_HAS_TLV_DESCRIPTORS);
+}
+
+static bool endsWith(const char* str, const char* suffix)
+{
+ size_t strLen = strlen(str);
+ size_t suffixLen = strlen(suffix);
+ if ( strLen < suffixLen )
+ return false;
+ return (strcmp(&str[strLen-suffixLen], suffix) == 0);
+}
+
+bool MachOFile::isSharedCacheEligiblePath(const char* dylibName) {
+ return ( (strncmp(dylibName, "/usr/lib/", 9) == 0)
+ || (strncmp(dylibName, "/System/Library/", 16) == 0)
+ || (strncmp(dylibName, "/System/iOSSupport/usr/lib/", 27) == 0)
+ || (strncmp(dylibName, "/System/iOSSupport/System/Library/", 34) == 0)
+ || (strncmp(dylibName, "/Library/Apple/usr/lib/", 23) == 0)
+ || (strncmp(dylibName, "/Library/Apple/System/Library/", 30) == 0)
+ || (strncmp(dylibName, "/System/DriverKit/", 18) == 0));
+}
+
+static bool startsWith(const char* buffer, const char* valueToFind) {
+ return strncmp(buffer, valueToFind, strlen(valueToFind)) == 0;
+}
+
+static bool platformExcludesSharedCache_macOS(const char* installName) {
+ // Note: This function basically matches dontCache() from update dyld shared cache
+
+ if ( startsWith(installName, "/usr/lib/system/introspection/") )
+ return true;
+ if ( startsWith(installName, "/System/Library/QuickTime/") )
+ return true;
+ if ( startsWith(installName, "/System/Library/Tcl/") )
+ return true;
+ if ( startsWith(installName, "/System/Library/Perl/") )
+ return true;
+ if ( startsWith(installName, "/System/Library/MonitorPanels/") )
+ return true;
+ if ( startsWith(installName, "/System/Library/Accessibility/") )
+ return true;
+ if ( startsWith(installName, "/usr/local/") )
+ return true;
+ if ( startsWith(installName, "/usr/lib/pam/") )
+ return true;
+ // We no longer support ROSP, so skip all paths which start with the special prefix
+ if ( startsWith(installName, "/System/Library/Templates/Data/") )
+ return true;
+
+ // anything inside a .app bundle is specific to app, so should not be in shared cache
+ if ( strstr(installName, ".app/") != NULL )
+ return true;
+
+ return false;
+}
+
+static bool platformExcludesSharedCache_iOS(const char* installName) {
+ if ( strcmp(installName, "/System/Library/Caches/com.apple.xpc/sdk.dylib") == 0 )
+ return true;
+ if ( strcmp(installName, "/System/Library/Caches/com.apple.xpcd/xpcd_cache.dylib") == 0 )
+ return true;
+ return false;
+}
+
+// Returns true if the current platform requires that this install name be excluded from the shared cache
+// Note that this overrides any exclusion from anywhere else.
+static bool platformExcludesSharedCache(Platform platform, const char* installName) {
+ if ( MachOFile::isSimulatorPlatform(platform) )
+ return false;
+ if ( (platform == dyld3::Platform::macOS) || (platform == dyld3::Platform::iOSMac) )
+ return platformExcludesSharedCache_macOS(installName);
+ // Everything else is based on iOS so just use that value
+ return platformExcludesSharedCache_iOS(installName);
+}
+
+
+bool MachOFile::canBePlacedInDyldCache(const char* path, void (^failureReason)(const char*)) const
+{
+
+ if ( !isSharedCacheEligiblePath(path) ) {
+ // Dont spam the user with an error about paths when we know these are never eligible.
+ return false;
+ }
+
+ // only dylibs can go in cache
+ if ( this->filetype != MH_DYLIB ) {
+ failureReason("Not MH_DYLIB");
+ return false; // cannot continue, installName() will assert() if not a dylib
+ }
+
+
+ const char* dylibName = installName();
+ if ( dylibName[0] != '/' ) {
+ failureReason("install name not an absolute path");
+ // Don't continue as we don't want to spam the log with errors we don't need.
+ return false;
+ }
+ else if ( strcmp(dylibName, path) != 0 ) {
+ failureReason("install path does not match install name");
+ return false;
+ }
+ else if ( strstr(dylibName, "//") != 0 ) {
+ failureReason("install name should not include //");
+ return false;
+ }
+ else if ( strstr(dylibName, "./") != 0 ) {
+ failureReason("install name should not include ./");
+ return false;
+ }
+
+ __block bool platformExcludedFile = false;
+ forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) {
+ if ( platformExcludedFile )
+ return;
+ if ( platformExcludesSharedCache(platform, dylibName) ) {
+ platformExcludedFile = true;
+ return;
+ }
+ });
+ if ( platformExcludedFile ) {
+ failureReason("install name is not shared cache eligible on platform");
+ return false;
+ }
+
+ bool retval = true;
+
+ // flat namespace files cannot go in cache
+ if ( (this->flags & MH_TWOLEVEL) == 0 ) {
+ retval = false;
+ failureReason("Not built with two level namespaces");
+ }
+
+ // don't put debug variants into dyld cache
+ if ( endsWith(path, "_profile.dylib") || endsWith(path, "_debug.dylib") || endsWith(path, "_profile") || endsWith(path, "_debug") || endsWith(path, "/CoreADI") ) {
+ retval = false;
+ failureReason("Variant image");
+ }
+
+ // dylib must have extra info for moving DATA and TEXT segments apart
+ __block bool hasExtraInfo = false;
+ __block bool hasDyldInfo = false;
+ __block bool hasExportTrie = false;
+ Diagnostics diag;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_SEGMENT_SPLIT_INFO )
+ hasExtraInfo = true;
+ if ( cmd->cmd == LC_DYLD_INFO_ONLY )
+ hasDyldInfo = true;
+ if ( cmd->cmd == LC_DYLD_EXPORTS_TRIE )
+ hasExportTrie = true;
+ });
+ if ( !hasExtraInfo ) {
+ retval = false;
+ failureReason("Missing split seg info");
+ }
+ if ( !hasDyldInfo && !hasExportTrie ) {
+ retval = false;
+ failureReason("Old binary, missing dyld info or export trie");
+ }
+
+ // dylib can only depend on other dylibs in the shared cache
+ __block bool allDepPathsAreGood = true;
+ forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
+ // Skip weak links. They are allowed to be missing
+ if ( isWeak )
+ return;
+ if ( !isSharedCacheEligiblePath(loadPath) ) {
+ allDepPathsAreGood = false;
+ stop = true;
+ }
+ });
+ if ( !allDepPathsAreGood ) {
+ retval = false;
+ failureReason("Depends on dylibs ineligable for dyld cache");
+ }
+
+ // dylibs with interposing info cannot be in cache
+ if ( hasInterposingTuples() ) {
+ retval = false;
+ failureReason("Has interposing tuples");
+ }
+
+ // Temporarily kick out swift binaries out of dyld cache on watchOS simulators as they have missing split seg
+ if ( (this->cputype == CPU_TYPE_I386) && builtForPlatform(Platform::watchOS_simulator) ) {
+ if ( strncmp(dylibName, "/usr/lib/swift/", 15) == 0 ) {
+ retval = false;
+ failureReason("i386 swift binary");
+ }
+ }
+
+ return retval;
+}
+
+#if BUILDING_APP_CACHE_UTIL
+bool MachOFile::canBePlacedInKernelCollection(const char* path, void (^failureReason)(const char*)) const
+{
+ // only dylibs and the kernel itself can go in cache
+ if ( this->filetype == MH_EXECUTE ) {
+ // xnu
+ } else if ( this->isKextBundle() ) {
+ // kext's
+ } else {
+ failureReason("Not MH_KEXT_BUNDLE");
+ return false;
+ }
+
+ if ( this->filetype == MH_EXECUTE ) {
+ // xnu
+
+ // two-level namespace binaries cannot go in cache
+ if ( (this->flags & MH_TWOLEVEL) != 0 ) {
+ failureReason("Built with two level namespaces");
+ return false;
+ }
+
+ // xnu kernel cannot have a page zero
+ __block bool foundPageZero = false;
+ forEachSegment(^(const SegmentInfo &segmentInfo, bool &stop) {
+ if ( strcmp(segmentInfo.segName, "__PAGEZERO") == 0 ) {
+ foundPageZero = true;
+ stop = true;
+ }
+ });
+ if (foundPageZero) {
+ failureReason("Has __PAGEZERO");
+ return false;
+ }
+
+ // xnu must have an LC_UNIXTHREAD to point to the entry point
+ __block bool foundMainLC = false;
+ __block bool foundUnixThreadLC = false;
+ Diagnostics diag;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_MAIN ) {
+ foundMainLC = true;
+ stop = true;
+ }
+ else if ( cmd->cmd == LC_UNIXTHREAD ) {
+ foundUnixThreadLC = true;
+ }
+ });
+ if (foundMainLC) {
+ failureReason("Found LC_MAIN");
+ return false;
+ }
+ if (!foundUnixThreadLC) {
+ failureReason("Expected LC_UNIXTHREAD");
+ return false;
+ }
+
+ if (diag.hasError()) {
+ failureReason("Error parsing load commands");
+ return false;
+ }
+
+ // The kernel should be a static executable, not a dynamic one
+ if ( !isStaticExecutable() ) {
+ failureReason("Expected static executable");
+ return false;
+ }
+
+ // The kernel must be built with -pie
+ if ( !isPIE() ) {
+ failureReason("Expected pie");
+ return false;
+ }
+ }
+
+ if ( isArch("arm64e") && isKextBundle() && !hasChainedFixups() ) {
+ failureReason("Missing fixup information");
+ return false;
+ }
+
+ // dylibs with interposing info cannot be in cache
+ if ( hasInterposingTuples() ) {
+ failureReason("Has interposing tuples");
+ return false;
+ }
+
+ // Only x86_64 is allowed to have RWX segments
+ if ( !isArch("x86_64") && !isArch("x86_64h") ) {
+ __block bool foundBadSegment = false;
+ forEachSegment(^(const SegmentInfo &info, bool &stop) {
+ if ( (info.protections & (VM_PROT_WRITE | VM_PROT_EXECUTE)) == (VM_PROT_WRITE | VM_PROT_EXECUTE) ) {
+ failureReason("Segments are not allowed to be both writable and executable");
+ foundBadSegment = true;
+ stop = true;
+ }
+ });
+ if ( foundBadSegment )
+ return false;
+ }
+
+ return true;
+}
+#endif
+
+static bool platformExcludesPrebuiltClosure_macOS(const char* path) {
+ // We no longer support ROSP, so skip all paths which start with the special prefix
+ if ( startsWith(path, "/System/Library/Templates/Data/") )
+ return true;
+
+ // anything inside a .app bundle is specific to app, so should not get a prebuilt closure
+ if ( strstr(path, ".app/") != NULL )
+ return true;
+
+ return false;
+}
+
+static bool platformExcludesPrebuiltClosure_iOS(const char* path) {
+ if ( strcmp(path, "/System/Library/Caches/com.apple.xpc/sdk.dylib") == 0 )
+ return true;
+ if ( strcmp(path, "/System/Library/Caches/com.apple.xpcd/xpcd_cache.dylib") == 0 )
+ return true;
+ return false;
+}
+
+// Returns true if the current platform requires that this install name be excluded from the shared cache
+// Note that this overrides any exclusion from anywhere else.
+static bool platformExcludesPrebuiltClosure(Platform platform, const char* path) {
+ if ( MachOFile::isSimulatorPlatform(platform) )
+ return false;
+ if ( (platform == dyld3::Platform::macOS) || (platform == dyld3::Platform::iOSMac) )
+ return platformExcludesPrebuiltClosure_macOS(path);
+ // Everything else is based on iOS so just use that value
+ return platformExcludesPrebuiltClosure_iOS(path);
+}
+
+bool MachOFile::canHavePrecomputedDlopenClosure(const char* path, void (^failureReason)(const char*)) const
+{
+ __block bool retval = true;
+
+ // only dylibs can go in cache
+ if ( (this->filetype != MH_DYLIB) && (this->filetype != MH_BUNDLE) ) {
+ retval = false;
+ failureReason("not MH_DYLIB or MH_BUNDLE");
+ }
+
+ // flat namespace files cannot go in cache
+ if ( (this->flags & MH_TWOLEVEL) == 0 ) {
+ retval = false;
+ failureReason("not built with two level namespaces");
+ }
+
+ // can only depend on other dylibs with absolute paths
+ __block bool allDepPathsAreGood = true;
+ forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
+ if ( loadPath[0] != '/' ) {
+ allDepPathsAreGood = false;
+ stop = true;
+ }
+ });
+ if ( !allDepPathsAreGood ) {
+ retval = false;
+ failureReason("depends on dylibs that are not absolute paths");
+ }
+
+ __block bool platformExcludedFile = false;
+ forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) {
+ if ( platformExcludedFile )
+ return;
+ if ( platformExcludesPrebuiltClosure(platform, path) ) {
+ platformExcludedFile = true;
+ return;
+ }
+ });
+ if ( platformExcludedFile ) {
+ failureReason("file cannot get a prebuilt closure on this platform");
+ return false;
+ }
+
+ // dylibs with interposing info cannot have dlopen closure pre-computed
+ if ( hasInterposingTuples() ) {
+ retval = false;
+ failureReason("has interposing tuples");
+ }
+
+ // special system dylib overrides cannot have closure pre-computed
+ if ( strncmp(path, "/usr/lib/system/introspection/", 30) == 0 ) {
+ retval = false;
+ failureReason("override of OS dylib");
+ }
+
+ return retval;
+}
+
+bool MachOFile::hasInterposingTuples() const
+{
+ __block bool hasInterposing = false;
+ Diagnostics diag;
+ forEachInterposingSection(diag, ^(uint64_t vmOffset, uint64_t vmSize, bool &stop) {
+ hasInterposing = true;
+ stop = true;
+ });
+ return hasInterposing;
+}
+
+bool MachOFile::isFairPlayEncrypted(uint32_t& textOffset, uint32_t& size) const
+{
+ if ( const encryption_info_command* encCmd = findFairPlayEncryptionLoadCommand() ) {
+ if ( encCmd->cryptid == 1 ) {
+ // Note: cryptid is 0 in just-built apps. The AppStore sets cryptid to 1
+ textOffset = encCmd->cryptoff;
+ size = encCmd->cryptsize;
+ return true;
+ }
+ }
+ textOffset = 0;
+ size = 0;
+ return false;
+}
+
+bool MachOFile::canBeFairPlayEncrypted() const
+{
+ return (findFairPlayEncryptionLoadCommand() != nullptr);
+}
+
+const encryption_info_command* MachOFile::findFairPlayEncryptionLoadCommand() const
+{
+ __block const encryption_info_command* result = nullptr;
+ Diagnostics diag;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( (cmd->cmd == LC_ENCRYPTION_INFO) || (cmd->cmd == LC_ENCRYPTION_INFO_64) ) {
+ result = (encryption_info_command*)cmd;
+ stop = true;
+ }
+ });
+ if ( diag.noError() )
+ return result;
+ else
+ return nullptr;
+}
+
+
+bool MachOFile::hasLoadCommand(uint32_t cmdNum) const
+{
+ __block bool hasLC = false;
+ Diagnostics diag;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == cmdNum ) {
+ hasLC = true;
+ stop = true;
+ }
+ });
+ return hasLC;
+}
+
+bool MachOFile::allowsAlternatePlatform() const
+{
+ __block bool result = false;
+ forEachSection(^(const SectionInfo& info, bool malformedSectionRange, bool& stop) {
+ if ( (strcmp(info.sectName, "__allow_alt_plat") == 0) && (strncmp(info.segInfo.segName, "__DATA", 6) == 0) ) {
+ result = true;
+ stop = true;
+ }
+ });
+ return result;
+}
+
+bool MachOFile::hasChainedFixups() const
+{
+#if SUPPORT_ARCH_arm64e
+ // arm64e always uses chained fixups
+ if ( (this->cputype == CPU_TYPE_ARM64) && (this->maskedCpuSubtype() == CPU_SUBTYPE_ARM64E) ) {
+ // Not all binaries have fixups at all so check for the load commands
+ return hasLoadCommand(LC_DYLD_INFO_ONLY) || hasLoadCommand(LC_DYLD_CHAINED_FIXUPS);
+ }
+#endif
+ return hasLoadCommand(LC_DYLD_CHAINED_FIXUPS);
+}
+
+bool MachOFile::hasChainedFixupsLoadCommand() const
+{
+ return hasLoadCommand(LC_DYLD_CHAINED_FIXUPS);
+}
+
+bool MachOFile::hasOpcodeFixups() const
+{
+ return hasLoadCommand(LC_DYLD_INFO_ONLY) || hasLoadCommand(LC_DYLD_INFO) ;
+}
+
+uint64_t MachOFile::read_uleb128(Diagnostics& diag, const uint8_t*& p, const uint8_t* end)
+{
+ uint64_t result = 0;
+ int bit = 0;
+ do {
+ if ( p == end ) {
+ diag.error("malformed uleb128");
+ break;
+ }
+ uint64_t slice = *p & 0x7f;
+
+ if ( bit > 63 ) {
+ diag.error("uleb128 too big for uint64");
+ break;
+ }
+ else {
+ result |= (slice << bit);
+ bit += 7;
+ }
+ }
+ while (*p++ & 0x80);
+ return result;
+}
+
+
+int64_t MachOFile::read_sleb128(Diagnostics& diag, const uint8_t*& p, const uint8_t* end)
+{
+ int64_t result = 0;
+ int bit = 0;
+ uint8_t byte = 0;
+ do {
+ if ( p == end ) {
+ diag.error("malformed sleb128");
+ break;
+ }
+ byte = *p++;
+ result |= (((int64_t)(byte & 0x7f)) << bit);
+ bit += 7;
+ } while (byte & 0x80);
+ // sign extend negative numbers
+ if ( ((byte & 0x40) != 0) && (bit < 64) )
+ result |= (~0ULL) << bit;
+ return result;
+}
+
+
+const MachOFile* MachOFile::compatibleSlice(Diagnostics& diag, const void* fileContent, size_t contentSize, const char* path, Platform platform, bool isOSBinary, const GradedArchs& archs)
+{
+ const MachOFile* mf = nullptr;
+ if ( const dyld3::FatFile* ff = dyld3::FatFile::isFatFile(fileContent) ) {
+ uint64_t sliceOffset;
+ uint64_t sliceLen;
+ bool missingSlice;
+ if ( ff->isFatFileWithSlice(diag, contentSize, archs, isOSBinary, sliceOffset, sliceLen, missingSlice) ) {
+ mf = (MachOFile*)((long)fileContent + sliceOffset);
+ }
+ else {
+ char strBuf[256];
+ diag.error("fat file, but missing compatible architecture (have '%s', need '%s')", ff->archNames(strBuf), archs.name());
+ return nullptr;
+ }
+ }
+ else {
+ mf = (MachOFile*)fileContent;
+ }
+
+ if ( !mf->hasMachOMagic() || !mf->isMachO(diag, contentSize) ) {
+ diag.error("not a mach-o file");
+ return nullptr;
+ }
+
+ if ( archs.grade(mf->cputype, mf->cpusubtype, isOSBinary) == 0 ) {
+ diag.error("mach-o file, but is an incompatible architecture (have '%s', need '%s')", mf->archName(), archs.name());
+ return nullptr;
+ }
+
+ if ( !mf->loadableIntoProcess(platform, path) ) {
+ __block Platform havePlatform = Platform::unknown;
+ mf->forEachSupportedPlatform(^(Platform aPlat, uint32_t minOS, uint32_t sdk) {
+ havePlatform = aPlat;
+ });
+ diag.error("mach-o file (%s), but incompatible platform (have '%s', need '%s')", path, MachOFile::platformName(havePlatform), MachOFile::platformName(platform));
+ return nullptr;
+ }
+
+ return mf;
+}
+
+
+} // namespace dyld3
+
+
+
+
+