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+++ dyld/dyld-1125.5/common/MachOFile.cpp
@@ -0,0 +1,4095 @@
+/*
+ * 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 <strings.h>
+#include <stdio.h>
+#include <TargetConditionals.h>
+#include "Defines.h"
+#if TARGET_OS_EXCLAVEKIT
+ #define OSSwapBigToHostInt32 __builtin_bswap32
+ #define OSSwapBigToHostInt64 __builtin_bswap64
+ #define htonl __builtin_bswap32
+#else
+ #include <sys/stat.h>
+ #include <sys/types.h>
+ #include <sys/errno.h>
+ #include <sys/fcntl.h>
+ #include <unistd.h>
+ #include <mach/host_info.h>
+ #include <mach/mach.h>
+ #include <mach/mach_host.h>
+#if SUPPORT_CLASSIC_RELOCS
+ #include <mach-o/reloc.h>
+ #include <mach-o/x86_64/reloc.h>
+#endif
+extern "C" {
+ #include <corecrypto/ccdigest.h>
+ #include <corecrypto/ccsha1.h>
+ #include <corecrypto/ccsha2.h>
+}
+#endif
+
+#include "Defines.h"
+
+#include <mach-o/nlist.h>
+
+#include "Array.h"
+#include "MachOFile.h"
+#include "SupportedArchs.h"
+#include "CodeSigningTypes.h"
+
+#if (BUILDING_DYLD || BUILDING_LIBDYLD) && !TARGET_OS_EXCLAVEKIT
+ #include <subsystem.h>
+#endif
+
+namespace dyld3 {
+
+#if !TARGET_OS_EXCLAVEKIT
+
+//////////////////////////// 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/10111032> wrap calls to stat() with check for EAGAIN
+int fstatat(int fd, const char *path, struct stat *buf, int flag)
+{
+ int result;
+ do {
+ result = ::fstatat(fd, path, buf, flag);
+ } 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;
+}
+#endif // !TARGET_OS_EXCLAVEKIT
+
+
+//////////////////////////// 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;
+ }
+ // <rdar://90700132> make sure architectures list doesn't exceed the file size
+ // We can’t overflow due to maxArch check
+ // Check numArchs+1 to cover the extra read after the loop
+ if ( (sizeof(fat_header) + ((numArchs + 1) * sizeof(fat_arch))) > fileLen ) {
+ diag.error("fat header malformed, architecture slices extend beyond end of file");
+ 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) ) {
+ const uint32_t numArchs = OSSwapBigToHostInt32(nfat_arch);
+ if ( numArchs > ((4096 - sizeof(fat_header)) / sizeof(fat_arch_64)) ) {
+ diag.error("fat header too large: %u entries", OSSwapBigToHostInt32(nfat_arch));
+ return;
+ }
+ // <rdar://90700132> make sure architectures list doesn't exceed the file size
+ // We can’t overflow due to maxArch check
+ if ( (sizeof(fat_header) + (numArchs * sizeof(fat_arch_64))) > fileLen ) {
+ diag.error("fat header malformed, architecture slices extend beyond end of file");
+ return;
+ }
+ bool stop = false;
+ const fat_arch_64* const archs = (fat_arch_64*)(((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);
+ 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], uint64_t fileLen) const
+{
+ strBuf[0] = '\0';
+ Diagnostics diag;
+ __block bool needComma = false;
+ this->forEachSlice(diag, fileLen, 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_armv6m CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6M, false
+#define GRADE_armv7m CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7M, false
+#define GRADE_armv7em CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7EM, false
+#define GRADE_armv8m CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V8M, 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 = GradedArchs({GRADE_i386, 1});
+const GradedArchs GradedArchs::x86_64 = GradedArchs({GRADE_x86_64, 1});
+const GradedArchs GradedArchs::x86_64h = GradedArchs({GRADE_x86_64h, 2}, {GRADE_x86_64, 1});
+const GradedArchs GradedArchs::arm64 = GradedArchs({GRADE_arm64, 1});
+#if SUPPORT_ARCH_arm64e
+const GradedArchs GradedArchs::arm64e_keysoff = GradedArchs({GRADE_arm64e, 2}, {GRADE_arm64, 1});
+const GradedArchs GradedArchs::arm64e_keysoff_pb = GradedArchs({GRADE_arm64e_pb, 2}, {GRADE_arm64, 1});
+const GradedArchs GradedArchs::arm64e = GradedArchs({GRADE_arm64e, 1});
+const GradedArchs GradedArchs::arm64e_pb = GradedArchs({GRADE_arm64e_pb, 1});
+#endif
+const GradedArchs GradedArchs::armv7 = GradedArchs({GRADE_armv7, 1});
+const GradedArchs GradedArchs::armv7s = GradedArchs({GRADE_armv7s, 2}, {GRADE_armv7, 1});
+const GradedArchs GradedArchs::armv7k = GradedArchs({GRADE_armv7k, 1});
+const GradedArchs GradedArchs::armv7m = GradedArchs({GRADE_armv7m, 1});
+const GradedArchs GradedArchs::armv7em = GradedArchs({GRADE_armv7em, 1});
+
+
+#if SUPPORT_ARCH_arm64_32
+const GradedArchs GradedArchs::arm64_32 = GradedArchs({GRADE_arm64_32, 1});
+#endif
+#if BUILDING_LIBDYLD || BUILDING_UNIT_TESTS
+const GradedArchs GradedArchs::launch_AS = GradedArchs({GRADE_arm64e, 3}, {GRADE_arm64, 2}, {GRADE_x86_64, 1});
+const GradedArchs GradedArchs::launch_AS_Sim = GradedArchs({GRADE_arm64, 2}, {GRADE_x86_64, 1});
+const GradedArchs GradedArchs::launch_Intel_h = GradedArchs({GRADE_x86_64h, 3}, {GRADE_x86_64, 2}, {GRADE_i386, 1});
+const GradedArchs GradedArchs::launch_Intel = GradedArchs({GRADE_x86_64, 2}, {GRADE_i386, 1});
+const GradedArchs GradedArchs::launch_Intel_Sim = GradedArchs({GRADE_x86_64, 2}, {GRADE_i386, 1});
+#endif
+
+int GradedArchs::grade(uint32_t cputype, uint32_t cpusubtype, bool isOSBinary) const
+{
+ for (const auto& p : _orderedCpuTypes) {
+ if (p.type == 0) { break; }
+ 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);
+}
+
+void GradedArchs::forEachArch(bool platformBinariesOnly, void (^handler)(const char*)) const
+{
+ for (const auto& p : _orderedCpuTypes) {
+ if (p.type == 0)
+ break;
+ if ( p.osBinary && !platformBinariesOnly )
+ continue;
+ handler(MachOFile::archName(p.type, p.subtype));
+ }
+}
+
+bool GradedArchs::checksOSBinary() const
+{
+ for (const auto& p : _orderedCpuTypes) {
+ if (p.type == 0) { return false; }
+ if ( p.osBinary ) { return true; }
+ }
+ __builtin_unreachable();
+}
+
+bool GradedArchs::supports64() const
+{
+ return (_orderedCpuTypes.front().type & CPU_ARCH_ABI64) != 0;
+}
+
+#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
+}
+
+#if BUILDING_LIBDYLD || BUILDING_UNIT_TESTS
+const GradedArchs& GradedArchs::launchCurrentOS(const char* simArches)
+{
+#if TARGET_OS_SIMULATOR
+ // on Apple Silicon, there is both an arm64 and an x86_64 (under rosetta) simulators
+ // You cannot tell if you are running under rosetta, so CoreSimulator sets SIMULATOR_ARCHS
+ if ( strcmp(simArches, "arm64 x86_64") == 0 )
+ return launch_AS_Sim;
+ else
+ return x86_64;
+#elif TARGET_OS_OSX
+ #if __arm64__
+ return launch_AS;
+ #else
+ return isHaswell() ? launch_Intel_h : launch_Intel;
+ #endif
+#else
+ // all other platforms use same grading for executables as dylibs
+ return forCurrentOS(true, false);
+#endif
+}
+#endif // BUILDING_LIBDYLD
+
+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;
+ else if (strcmp(archName, "armv7m") == 0 )
+ return armv7m;
+ else if (strcmp(archName, "armv7em") == 0 )
+ return armv7em;
+#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 },
+ { "armv6m", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6M },
+ { "armv7m", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7M },
+ { "armv7em", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7EM },
+ { "armv8m", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V8M },
+};
+
+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
+ // HACK: Pretend armv7k kexts are 4k aligned
+ if ( this->isKextBundle() )
+ return false;
+ 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";
+}
+
+bool MachOFile::cpuTypeFromArchName(const char* archName, cpu_type_t* cputype, cpu_subtype_t* cpusubtype)
+{
+ for (const ArchInfo& info : _s_archInfos) {
+ if ( strcmp(archName, info.name) == 0 ) {
+ *cputype = info.cputype;
+ *cpusubtype = info.cpusubtype;
+ return true;
+ }
+ }
+ return false;
+}
+
+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);
+ if ( (packedVersion & 0xFF) != 0 ) {
+ *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, bool internalInstall) 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::isBuiltForSimulator() const
+{
+ __block bool result = false;
+ this->forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) {
+ switch ( platform ) {
+ case Platform::iOS_simulator:
+ case Platform::watchOS_simulator:
+ case Platform::tvOS_simulator:
+ result = true;
+ break;
+ default:
+ break;
+ }
+ });
+ return result;
+}
+
+bool MachOFile::isDyld() const
+{
+ return (this->filetype == MH_DYLINKER);
+}
+
+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
+}
+
+void MachOFile::forEachSupportedBuildTool(void (^handler)(Platform platform, uint32_t tool, uint32_t version)) const
+{
+ Diagnostics diag;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ switch ( cmd->cmd ) {
+ case LC_BUILD_VERSION: {
+ const build_version_command* buildCmd = (build_version_command *)cmd;
+ for ( uint32_t i = 0; i != buildCmd->ntools; ++i ) {
+ uint32_t offset = sizeof(build_version_command) + (i * sizeof(build_tool_version));
+ if ( offset >= cmd->cmdsize )
+ break;
+
+ const build_tool_version* firstTool = (const build_tool_version*)(&buildCmd[1]);
+ handler((Platform)(buildCmd->platform), firstTool[i].tool, firstTool[i].version);
+ }
+ }
+ }
+ });
+ 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 ( fileSize < sizeof(mach_header) ) {
+ diag.error("MachO header exceeds file length");
+ return false;
+ }
+
+ 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();
+}
+
+
+const MachOFile* MachOFile::isMachO(const void* content)
+{
+ const MachOFile* mf = (MachOFile*)content;
+ if ( mf->hasMachOMagic() )
+ return mf;
+ return nullptr;
+}
+
+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
+ }
+ if ( this->filetype > 12 ) {
+ diag.error("unknown mach-o filetype (%u)", this->filetype);
+ return;
+ }
+ const load_command* const cmdsEnd = (load_command*)((char*)startCmds + this->sizeofcmds);
+ const load_command* const cmdsLast = (load_command*)((char*)startCmds + this->sizeofcmds - sizeof(load_command));
+ const load_command* cmd = startCmds;
+ for (uint32_t i = 0; i < this->ncmds; ++i) {
+ if ( cmd > cmdsLast ) {
+ diag.error("malformed load command #%u of %u at %p with mh=%p, extends past sizeofcmds", i, this->ncmds, cmd, this);
+ return;
+ }
+ uint32_t cmdsize = cmd->cmdsize;
+ if ( cmdsize < 8 ) {
+ diag.error("malformed load command #%u of %u at %p with mh=%p, size (0x%X) too small", i, this->ncmds, cmd, this, cmd->cmdsize);
+ return;
+ }
+ if ( (cmdsize % 4) != 0 ) {
+ // FIXME: on 64-bit mach-o, should be 8-byte aligned, (might reveal bin-compat issues)
+ diag.error("malformed load command #%u of %u at %p with mh=%p, size (0x%X) not multiple of 4", i, this->ncmds, cmd, this, cmd->cmdsize);
+ return;
+ }
+ const load_command* nextCmd = (load_command*)((char *)cmd + cmdsize);
+ if ( (nextCmd > cmdsEnd) || (nextCmd < startCmds) ) {
+ diag.error("malformed load command #%u of %u 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);
+}
+
+
+bool MachOFile::hasObjC() const
+{
+ __block bool result = false;
+ forEachSection(^(const SectionInfo& info, bool malformedSectionRange, bool& stop) {
+ if ( (strcmp(info.sectName, "__objc_imageinfo") == 0) && (strncmp(info.segInfo.segName, "__DATA", 6) == 0) ) {
+ result = true;
+ stop = true;
+ }
+ if ( (this->cputype == CPU_TYPE_I386) && (strcmp(info.sectName, "__image_info") == 0) && (strcmp(info.segInfo.segName, "__OBJC") == 0) ) {
+ result = true;
+ stop = true;
+ }
+ });
+ return result;
+}
+
+bool MachOFile::hasSection(const char* segName, const char* sectName) const
+{
+ __block bool result = false;
+ forEachSection(^(const SectionInfo& info, bool malformedSectionRange, bool& stop) {
+ if ( (strcmp(info.segInfo.segName, segName) == 0) && (strcmp(info.sectName, sectName) == 0) ) {
+ result = true;
+ stop = true;
+ }
+ });
+ return result;
+}
+
+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) || (cmd->cmd == LC_ID_DYLINKER) ) {
+ 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;
+}
+
+UUID MachOFile::uuid() const {
+ Diagnostics diag;
+ __block UUID result;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_UUID ) {
+ const uuid_command* uc = (const uuid_command*)cmd;
+ result = UUID(uc->uuid);
+ stop = true;
+ }
+ });
+ diag.assertNoError();
+ return result;
+}
+
+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;
+ }
+ });
+#if !BUILDING_SHARED_CACHE_UTIL && !BUILDING_DYLDINFO && !BUILDING_UNIT_TESTS
+ // 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 TARGET_OS_EXCLAVEKIT
+ if ( !this->isDylib() || (strncmp(this->installName(), "/System/ExclaveKit/usr/lib/system/", 34) != 0) )
+ callback("/System/ExclaveKit/usr/lib/libSystem.dylib", false, false, false, 0x00010000, 0x00010000, stopped);
+#else
+ 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);
+ }
+#endif // TARGET_OS_EXCLAVEKIT
+ }
+#endif // !BUILDING_SHARED_CACHE_UTIL && !BUILDING_DYLDINFO && !BUILDING_UNIT_TESTS
+ 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;
+}
+
+const linkedit_data_command* MachOFile::chainedFixupsCmd() const {
+ Diagnostics diag;
+ __block const linkedit_data_command* command = nullptr;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_DYLD_CHAINED_FIXUPS ) {
+ command = (const linkedit_data_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:
+ case CPU_TYPE_ARM64_32:
+ return 32; // arm_thread_state64_t.__pc
+ }
+ return ~0U;
+}
+
+bool MachOFile::use64BitEntryRegs() const
+{
+ return is64() || isArch("arm64_32");
+}
+
+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 use64BitEntryRegs() ? regs64[index] : regs32[index];
+}
+
+
+bool MachOFile::getEntry(uint64_t& offset, bool& usesCRT) const
+{
+ Diagnostics diag;
+ offset = 0;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_MAIN ) {
+ entry_point_command* mainCmd = (entry_point_command*)cmd;
+ usesCRT = false;
+ offset = mainCmd->entryoff;
+ stop = true;
+ }
+ else if ( cmd->cmd == LC_UNIXTHREAD ) {
+ stop = true;
+ usesCRT = true;
+ uint64_t startAddress = entryAddrFromThreadCmd((thread_command*)cmd);
+ offset = startAddress - preferredLoadAddress();
+ }
+ });
+ return (offset != 0);
+}
+
+
+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);
+}
+
+#if BUILDING_CACHE_BUILDER || BUILDING_CACHE_BUILDER_UNIT_TESTS
+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)
+ || (strncmp(dylibName, "/System/Cryptexes/OS/usr/lib/", 29) == 0)
+ || (strncmp(dylibName, "/System/Cryptexes/OS/System/Library/", 36) == 0)
+ || (strncmp(dylibName, "/System/Cryptexes/OS/System/iOSSupport/usr/lib/", 47) == 0)
+ || (strncmp(dylibName, "/System/Cryptexes/OS/System/iOSSupport/System/Library/", 54) == 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;
+
+ // Depends on UHASHelloExtensionPoint-macOS which is not always cache eligible
+ if ( !strcmp(installName, "/System/Library/PrivateFrameworks/HelloWorldMacHelper.framework/Versions/A/HelloWorldMacHelper") )
+ 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;
+}
+
+// HACK: Remove this function. Its only here until we can handle cache overflow
+static bool platformExcludesSharedCache_sim(const char* installName) {
+ if ( startsWith(installName, "/System/Library/PrivateFrameworks/iWorkImport.framework/") )
+ return true;
+ if ( startsWith(installName, "/System/Library/PrivateFrameworks/News") )
+ return true;
+ if ( strcmp(installName, "/System/Library/PrivateFrameworks/StocksUI.framework/StocksUI") == 0 )
+ return true;
+ if ( strcmp(installName, "/System/Library/PrivateFrameworks/NewsUI.framework/NewsUI") == 0 )
+ return true;
+ if ( strcmp(installName, "/System/Library/PrivateFrameworks/CompassUI.framework/CompassUI") == 0 )
+ return true;
+ if ( strcmp(installName, "/System/Library/PrivateFrameworks/WeatherUI.framework/WeatherUI") == 0 )
+ return true;
+ if ( strcmp(installName, "/System/Library/PrivateFrameworks/NewsUI2.framework/NewsUI2") == 0 )
+ return true;
+ if ( strcmp(installName, "/System/Library/PrivateFrameworks/MLCompilerOS.framework/MLCompilerOS") == 0 )
+ return true;
+ if ( strcmp(installName, "/System/Library/PrivateFrameworks/HomeKitDaemon.framework/HomeKitDaemon") == 0 )
+ return true;
+ if ( strcmp(installName, "/System/Library/PrivateFrameworks/HomeKitDaemonLegacy.framework/HomeKitDaemonLegacy") == 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 platformExcludesSharedCache_sim(installName);
+ 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->isDylib() && !this->isDyld() ) {
+ 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;
+ }
+
+ // flat namespace files cannot go in cache
+ if ( (this->flags & MH_TWOLEVEL) == 0 ) {
+ failureReason("Not built with two level namespaces");
+ return false;
+ }
+
+ // don't put debug variants into dyld cache
+ if ( endsWith(path, "_profile.dylib") || endsWith(path, "_debug.dylib") || endsWith(path, "_asan.dylib")
+ || endsWith(path, "_profile") || endsWith(path, "_debug") || endsWith(path, "/CoreADI") ) {
+ failureReason("Variant image");
+ return false;
+ }
+
+ // dylib must have extra info for moving DATA and TEXT segments apart
+ __block bool hasExtraInfo = false;
+ __block bool hasDyldInfo = false;
+ __block bool hasExportTrie = false;
+ __block 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 ) {
+ std::string_view ignorePaths[] = {
+ "/usr/lib/libobjc-trampolines.dylib",
+ "/usr/lib/libffi-trampolines.dylib"
+ };
+ for ( std::string_view ignorePath : ignorePaths ) {
+ if ( ignorePath == path )
+ return false;
+ }
+ failureReason("Missing split seg info");
+ return false;
+ }
+ if ( !hasDyldInfo && !hasExportTrie ) {
+ failureReason("Old binary, missing dyld info or export trie");
+ return false;
+ }
+
+ // 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 ) {
+ failureReason("Depends on dylibs ineligable for dyld cache");
+ return false;
+ }
+
+ // dylibs with interposing info cannot be in cache
+ if ( hasInterposingTuples() ) {
+ failureReason("Has interposing tuples");
+ return false;
+ }
+
+ // 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 ) {
+ failureReason("i386 swift binary");
+ return false;
+ }
+ }
+
+ // These used to be in MachOAnalyzer
+ __block bool passedLinkeditChecks = false;
+ this->withFileLayout(diag, ^(const mach_o::Layout &layout) {
+
+ mach_o::SplitSeg splitSeg(layout);
+ mach_o::Fixups fixups(layout);
+
+ // arm64e requires split seg v2 as the split seg code can't handle chained fixups for split seg v1
+ if ( isArch("arm64e") ) {
+ if ( !splitSeg.isV2() ) {
+ failureReason("chained fixups requires split seg v2");
+ return;
+ }
+ }
+
+ // evict swift dylibs with split seg v1 info
+ if ( layout.isSwiftLibrary() && splitSeg.isV1() )
+ return;
+
+ if ( splitSeg.isV1() ) {
+ // Split seg v1 can only support 1 __DATA, and no other writable segments
+ __block bool foundBadSegment = false;
+ forEachSegment(^(const SegmentInfo& info, bool& stop) {
+ if ( info.protections == (VM_PROT_READ | VM_PROT_WRITE) ) {
+ if ( strcmp(info.segName, "__DATA") == 0 )
+ return;
+
+ failureReason("RW segments other than __DATA requires split seg v2");
+ foundBadSegment = true;
+ stop = true;
+ }
+ });
+
+ if ( foundBadSegment )
+ return;
+ }
+
+ // <rdar://problem/57769033> dyld_cache_patchable_location only supports addend in range 0..31
+ // rdar://96164956 (dyld needs to support arbitrary addends in cache patch table)
+ const bool is64bit = is64();
+ __block bool addendTooLarge = false;
+ const uint64_t tooLargeRegularAddend = 1 << 23;
+ const uint64_t tooLargeAuthAddend = 1 << 5;
+ if ( this->hasChainedFixups() ) {
+
+ // with chained fixups, addends can be in the import table or embedded in a bind pointer
+ __block std::vector<uint64_t> targetAddends;
+ fixups.forEachChainedFixupTarget(diag, ^(int libOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) {
+ if ( is64bit )
+ addend &= 0x00FFFFFFFFFFFFFF; // ignore TBI
+ targetAddends.push_back(addend);
+ });
+ // check each pointer for embedded addend
+ fixups.withChainStarts(diag, ^(const dyld_chained_starts_in_image* starts) {
+ fixups.forEachFixupInAllChains(diag, starts, false, ^(mach_o::ChainedFixupPointerOnDisk* fixupLoc, uint64_t fixupSegmentOffset, const dyld_chained_starts_in_segment* segInfo, bool& stop) {
+ switch (segInfo->pointer_format) {
+ case DYLD_CHAINED_PTR_ARM64E:
+ case DYLD_CHAINED_PTR_ARM64E_USERLAND:
+ if ( fixupLoc->arm64e.bind.bind ) {
+ uint64_t ordinal = fixupLoc->arm64e.bind.ordinal;
+ uint64_t addend = (ordinal < targetAddends.size()) ? targetAddends[ordinal] : 0;
+ if ( fixupLoc->arm64e.bind.auth ) {
+ if ( addend >= tooLargeAuthAddend ) {
+ addendTooLarge = true;
+ stop = true;
+ }
+ } else {
+ addend += fixupLoc->arm64e.signExtendedAddend();
+ if ( addend >= tooLargeRegularAddend ) {
+ addendTooLarge = true;
+ stop = true;
+ }
+ }
+ }
+ break;
+ case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
+ if ( fixupLoc->arm64e.bind24.bind ) {
+ uint64_t ordinal = fixupLoc->arm64e.bind24.ordinal;
+ uint64_t addend = (ordinal < targetAddends.size()) ? targetAddends[ordinal] : 0;
+ if ( fixupLoc->arm64e.bind24.auth ) {
+ if ( addend >= tooLargeAuthAddend ) {
+ addendTooLarge = true;
+ stop = true;
+ }
+ } else {
+ addend += fixupLoc->arm64e.signExtendedAddend();
+ if ( addend >= tooLargeRegularAddend ) {
+ addendTooLarge = true;
+ stop = true;
+ }
+ }
+ }
+ break;
+ case DYLD_CHAINED_PTR_64:
+ case DYLD_CHAINED_PTR_64_OFFSET: {
+ if ( fixupLoc->generic64.rebase.bind ) {
+ uint64_t ordinal = fixupLoc->generic64.bind.ordinal;
+ uint64_t addend = (ordinal < targetAddends.size()) ? targetAddends[ordinal] : 0;
+ addend += fixupLoc->generic64.bind.addend;
+ if ( addend >= tooLargeRegularAddend ) {
+ addendTooLarge = true;
+ stop = true;
+ }
+ }
+ break;
+ }
+ case DYLD_CHAINED_PTR_32:
+ if ( fixupLoc->generic32.bind.bind ) {
+ uint64_t ordinal = fixupLoc->generic32.bind.ordinal;
+ uint64_t addend = (ordinal < targetAddends.size()) ? targetAddends[ordinal] : 0;
+ addend += fixupLoc->generic32.bind.addend;
+ if ( addend >= tooLargeRegularAddend ) {
+ addendTooLarge = true;
+ stop = true;
+ }
+ }
+ break;
+ }
+ });
+ });
+ }
+ else {
+ // scan bind opcodes for large addend
+ auto handler = ^(const mach_o::Fixups::BindTargetInfo &info, bool &stop) {
+ uint64_t addend = info.addend;
+ if ( is64bit )
+ addend &= 0x00FFFFFFFFFFFFFF; // ignore TBI
+ if ( addend >= tooLargeRegularAddend ) {
+ addendTooLarge = true;
+ stop = true;
+ }
+ };
+ fixups.forEachBindTarget_Opcodes(diag, true, handler, handler);
+ }
+ if ( addendTooLarge ) {
+ failureReason("bind addend too large");
+ return;
+ }
+
+ if ( (isArch("x86_64") || isArch("x86_64h")) ) {
+ __block bool rebasesOk = true;
+ uint64_t startVMAddr = preferredLoadAddress();
+ uint64_t endVMAddr = startVMAddr + mappedSize();
+ fixups.forEachRebase(diag, ^(uint64_t runtimeOffset, uint64_t rebasedValue, bool &stop) {
+ // We allow TBI for x86_64 dylibs, but then require that the remainder of the offset
+ // is a 32-bit offset from the mach-header.
+ rebasedValue &= 0x00FFFFFFFFFFFFFFULL;
+ if ( (rebasedValue < startVMAddr) || (rebasedValue >= endVMAddr) ) {
+ failureReason("rebase value out of range of dylib");
+ rebasesOk = false;
+ stop = true;
+ return;
+ }
+
+ // Also error if the rebase location is anything other than 4/8 byte aligned
+ if ( (runtimeOffset & 0x3) != 0 ) {
+ failureReason("rebase value is not 4-byte aligned");
+ rebasesOk = false;
+ stop = true;
+ return;
+ }
+
+ // Error if the fixup will cross a page
+ if ( (runtimeOffset & 0xFFF) == 0xFFC ) {
+ failureReason("rebase value crosses page boundary");
+ rebasesOk = false;
+ stop = true;
+ return;
+ }
+ });
+
+ if ( !rebasesOk )
+ return;
+
+ if ( this->hasChainedFixups() ) {
+ fixups.withChainStarts(diag, ^(const dyld_chained_starts_in_image* starts) {
+ fixups.forEachFixupInAllChains(diag, starts, false, ^(mach_o::ChainedFixupPointerOnDisk* fixupLoc, uint64_t fixupSegmentOffset, const dyld_chained_starts_in_segment* segInfo, bool& stop) {
+ if ( (fixupSegmentOffset & 0xFFF) == 0xFFC ) {
+ failureReason("chained fixup crosses page boundary");
+ rebasesOk = false;
+ stop = true;
+ return;
+ }
+ });
+ });
+ }
+
+ if ( !rebasesOk )
+ return;
+ }
+
+ // Check that shared cache dylibs don't use undefined lookup
+ {
+ __block bool bindsOk = true;
+
+ auto checkBind = ^(int libOrdinal, bool& stop) {
+ if ( libOrdinal == BIND_SPECIAL_DYLIB_FLAT_LOOKUP ) {
+ failureReason("has dynamic_lookup binds");
+ bindsOk = false;
+ stop = true;
+ }
+ };
+
+ if (hasChainedFixups()) {
+ fixups.forEachChainedFixupTarget(diag, ^(int libOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) {
+ checkBind(libOrdinal, stop);
+ });
+ } else {
+ auto handler = ^(const mach_o::Fixups::BindTargetInfo &info, bool &stop) {
+ checkBind(info.libOrdinal, stop);
+ };
+ fixups.forEachBindTarget_Opcodes(diag, true, handler, handler);
+ }
+
+ if ( !bindsOk )
+ return;
+ }
+
+ passedLinkeditChecks = true;
+ });
+
+ return passedLinkeditChecks;
+}
+
+// Returns true if the executable path is eligible for a PrebuiltLoader on the given platform.
+bool MachOFile::canHavePrebuiltExecutableLoader(dyld3::Platform platform, const std::string_view& path,
+ void (^failureReason)(const char*)) const
+{
+ // For now we can't build prebuilt loaders for the simulator
+ if ( isSimulatorPlatform(platform) ) {
+ // Don't spam with tons of messages about executables
+ return false;
+ }
+
+ if ( (platform == dyld3::Platform::macOS) || (platform == dyld3::Platform::iOSMac) ) {
+ // We no longer support ROSP, so skip all paths which start with the special prefix
+ if ( path.starts_with("/System/Library/Templates/Data/") ) {
+ // Dont spam the user with an error about paths when we know these are never eligible.
+ return false;
+ }
+
+ static const char* sAllowedPrefixes[] = {
+ "/bin/",
+ "/sbin/",
+ "/usr/",
+ "/System/",
+ "/Library/Apple/System/",
+ "/Library/Apple/usr/",
+ "/System/Applications/Safari.app/",
+ "/Library/CoreMediaIO/Plug-Ins/DAL/" // temp until plugins moved or closured working
+ };
+
+ bool inSearchDir = false;
+ for ( const char* searchDir : sAllowedPrefixes ) {
+ if ( path.starts_with(searchDir) ) {
+ inSearchDir = true;
+ break;
+ }
+ }
+
+ if ( !inSearchDir ) {
+ failureReason("path not eligible");
+ return false;
+ }
+ } else {
+ // On embedded, only staged apps are excluded. They will run from a different location at runtime
+ if ( path.find("/staged_system_apps/") != std::string::npos ) {
+ // Dont spam the user with an error about paths when we know these are never eligible.
+ return false;
+ }
+ }
+
+ if ( !hasCodeSignature() ) {
+ failureReason("missing code signature");
+ return false;
+ }
+
+ return true;
+}
+#endif
+
+#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;
+}
+
+bool MachOFile::usesClassicRelocationsInKernelCollection() const {
+ // The xnu x86_64 static executable needs to do the i386->x86_64 transition
+ // so will be emitted with classic relocations
+ if ( isArch("x86_64") || isArch("x86_64h") ) {
+ return isStaticExecutable() || isFileSet();
+ }
+ return false;
+}
+#endif
+
+#if BUILDING_CACHE_BUILDER || BUILDING_CACHE_BUILDER_UNIT_TESTS
+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;
+}
+#endif
+
+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) ;
+}
+
+uint16_t MachOFile::chainedPointerFormat(const dyld_chained_fixups_header* header)
+{
+ const dyld_chained_starts_in_image* startsInfo = (dyld_chained_starts_in_image*)((uint8_t*)header + header->starts_offset);
+ for (uint32_t i=0; i < startsInfo->seg_count; ++i) {
+ uint32_t segInfoOffset = startsInfo->seg_info_offset[i];
+ // 0 offset means this segment has no fixups
+ if ( segInfoOffset == 0 )
+ continue;
+ const dyld_chained_starts_in_segment* segInfo = (dyld_chained_starts_in_segment*)((uint8_t*)startsInfo + segInfoOffset);
+ if ( segInfo->page_count != 0 )
+ return segInfo->pointer_format;
+ }
+ return 0; // no chains (perhaps no __DATA segment)
+}
+
+// find dyld_chained_starts_in_image* in image
+// if old arm64e binary, synthesize dyld_chained_starts_in_image*
+void MachOFile::withChainStarts(Diagnostics& diag, const dyld_chained_fixups_header* chainHeader, void (^callback)(const dyld_chained_starts_in_image*))
+{
+ if ( chainHeader == nullptr ) {
+ diag.error("Must pass in a chain header");
+ return;
+ }
+ // we have a pre-computed offset into LINKEDIT for dyld_chained_starts_in_image
+ callback((dyld_chained_starts_in_image*)((uint8_t*)chainHeader + chainHeader->starts_offset));
+}
+
+void MachOFile::forEachFixupChainSegment(Diagnostics& diag, const dyld_chained_starts_in_image* starts,
+ void (^handler)(const dyld_chained_starts_in_segment* segInfo, uint32_t segIndex, bool& stop))
+{
+ bool stopped = false;
+ for (uint32_t segIndex=0; segIndex < starts->seg_count && !stopped; ++segIndex) {
+ if ( starts->seg_info_offset[segIndex] == 0 )
+ continue;
+ const dyld_chained_starts_in_segment* segInfo = (dyld_chained_starts_in_segment*)((uint8_t*)starts + starts->seg_info_offset[segIndex]);
+ handler(segInfo, segIndex, stopped);
+ }
+}
+
+
+bool MachOFile::walkChain(Diagnostics& diag, ChainedFixupPointerOnDisk* chain, uint16_t pointer_format, bool notifyNonPointers, uint32_t max_valid_pointer,
+ void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, bool& stop))
+{
+ const unsigned stride = ChainedFixupPointerOnDisk::strideSize(pointer_format);
+ bool stop = false;
+ bool chainEnd = false;
+ while (!stop && !chainEnd) {
+ // copy chain content, in case handler modifies location to final value
+ ChainedFixupPointerOnDisk chainContent = *chain;
+ handler(chain, stop);
+
+ if ( !stop ) {
+ switch (pointer_format) {
+ case DYLD_CHAINED_PTR_ARM64E:
+ case DYLD_CHAINED_PTR_ARM64E_KERNEL:
+ case DYLD_CHAINED_PTR_ARM64E_USERLAND:
+ case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
+ case DYLD_CHAINED_PTR_ARM64E_FIRMWARE:
+ if ( chainContent.arm64e.rebase.next == 0 )
+ chainEnd = true;
+ else
+ chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.arm64e.rebase.next*stride);
+ break;
+ case DYLD_CHAINED_PTR_64:
+ case DYLD_CHAINED_PTR_64_OFFSET:
+ if ( chainContent.generic64.rebase.next == 0 )
+ chainEnd = true;
+ else
+ chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.generic64.rebase.next*4);
+ break;
+ case DYLD_CHAINED_PTR_32:
+ if ( chainContent.generic32.rebase.next == 0 )
+ chainEnd = true;
+ else {
+ chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.generic32.rebase.next*4);
+ if ( !notifyNonPointers ) {
+ while ( (chain->generic32.rebase.bind == 0) && (chain->generic32.rebase.target > max_valid_pointer) ) {
+ // not a real pointer, but a non-pointer co-opted into chain
+ chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chain->generic32.rebase.next*4);
+ }
+ }
+ }
+ break;
+ case DYLD_CHAINED_PTR_64_KERNEL_CACHE:
+ case DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE:
+ if ( chainContent.kernel64.next == 0 )
+ chainEnd = true;
+ else
+ chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.kernel64.next*stride);
+ break;
+ case DYLD_CHAINED_PTR_32_FIRMWARE:
+ if ( chainContent.firmware32.next == 0 )
+ chainEnd = true;
+ else
+ chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.firmware32.next*4);
+ break;
+ default:
+ diag.error("unknown pointer format 0x%04X", pointer_format);
+ stop = true;
+ }
+ }
+ }
+ return stop;
+}
+
+void MachOFile::forEachFixupInSegmentChains(Diagnostics& diag, const dyld_chained_starts_in_segment* segInfo,
+ bool notifyNonPointers, uint8_t* segmentContent,
+ void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, bool& stop))
+{
+ bool stopped = false;
+ for (uint32_t pageIndex=0; pageIndex < segInfo->page_count && !stopped; ++pageIndex) {
+ uint16_t offsetInPage = segInfo->page_start[pageIndex];
+ if ( offsetInPage == DYLD_CHAINED_PTR_START_NONE )
+ continue;
+ if ( offsetInPage & DYLD_CHAINED_PTR_START_MULTI ) {
+ // 32-bit chains which may need multiple starts per page
+ uint32_t overflowIndex = offsetInPage & ~DYLD_CHAINED_PTR_START_MULTI;
+ bool chainEnd = false;
+ while (!stopped && !chainEnd) {
+ chainEnd = (segInfo->page_start[overflowIndex] & DYLD_CHAINED_PTR_START_LAST);
+ offsetInPage = (segInfo->page_start[overflowIndex] & ~DYLD_CHAINED_PTR_START_LAST);
+ uint8_t* pageContentStart = segmentContent + (pageIndex * segInfo->page_size);
+ ChainedFixupPointerOnDisk* chain = (ChainedFixupPointerOnDisk*)(pageContentStart+offsetInPage);
+ stopped = walkChain(diag, chain, segInfo->pointer_format, notifyNonPointers, segInfo->max_valid_pointer, handler);
+ ++overflowIndex;
+ }
+ }
+ else {
+ // one chain per page
+ uint8_t* pageContentStart = segmentContent + (pageIndex * segInfo->page_size);
+ ChainedFixupPointerOnDisk* chain = (ChainedFixupPointerOnDisk*)(pageContentStart+offsetInPage);
+ stopped = walkChain(diag, chain, segInfo->pointer_format, notifyNonPointers, segInfo->max_valid_pointer, handler);
+ }
+ }
+}
+
+void MachOFile::forEachChainedFixupTarget(Diagnostics& diag, const dyld_chained_fixups_header* header,
+ const linkedit_data_command* chainedFixups,
+ void (^callback)(int libOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop))
+{
+ if ( (header->imports_offset > chainedFixups->datasize) || (header->symbols_offset > chainedFixups->datasize) ) {
+ diag.error("malformed import table");
+ return;
+ }
+
+ bool stop = false;
+
+ const dyld_chained_import* imports;
+ const dyld_chained_import_addend* importsA32;
+ const dyld_chained_import_addend64* importsA64;
+ const char* symbolsPool = (char*)header + header->symbols_offset;
+ uint32_t maxSymbolOffset = chainedFixups->datasize - header->symbols_offset;
+ int libOrdinal;
+ switch (header->imports_format) {
+ case DYLD_CHAINED_IMPORT:
+ imports = (dyld_chained_import*)((uint8_t*)header + header->imports_offset);
+ for (uint32_t i=0; i < header->imports_count && !stop; ++i) {
+ const char* symbolName = &symbolsPool[imports[i].name_offset];
+ if ( imports[i].name_offset > maxSymbolOffset ) {
+ diag.error("malformed import table, string overflow");
+ return;
+ }
+ uint8_t libVal = imports[i].lib_ordinal;
+ if ( libVal > 0xF0 )
+ libOrdinal = (int8_t)libVal;
+ else
+ libOrdinal = libVal;
+ callback(libOrdinal, symbolName, 0, imports[i].weak_import, stop);
+ if ( stop )
+ return;
+ }
+ break;
+ case DYLD_CHAINED_IMPORT_ADDEND:
+ importsA32 = (dyld_chained_import_addend*)((uint8_t*)header + header->imports_offset);
+ for (uint32_t i=0; i < header->imports_count && !stop; ++i) {
+ const char* symbolName = &symbolsPool[importsA32[i].name_offset];
+ if ( importsA32[i].name_offset > maxSymbolOffset ) {
+ diag.error("malformed import table, string overflow");
+ return;
+ }
+ uint8_t libVal = importsA32[i].lib_ordinal;
+ if ( libVal > 0xF0 )
+ libOrdinal = (int8_t)libVal;
+ else
+ libOrdinal = libVal;
+ callback(libOrdinal, symbolName, importsA32[i].addend, importsA32[i].weak_import, stop);
+ if ( stop )
+ return;
+ }
+ break;
+ case DYLD_CHAINED_IMPORT_ADDEND64:
+ importsA64 = (dyld_chained_import_addend64*)((uint8_t*)header + header->imports_offset);
+ for (uint32_t i=0; i < header->imports_count && !stop; ++i) {
+ const char* symbolName = &symbolsPool[importsA64[i].name_offset];
+ if ( importsA64[i].name_offset > maxSymbolOffset ) {
+ diag.error("malformed import table, string overflow");
+ return;
+ }
+ uint16_t libVal = importsA64[i].lib_ordinal;
+ if ( libVal > 0xFFF0 )
+ libOrdinal = (int16_t)libVal;
+ else
+ libOrdinal = libVal;
+ callback(libOrdinal, symbolName, importsA64[i].addend, importsA64[i].weak_import, stop);
+ if ( stop )
+ return;
+ }
+ break;
+ default:
+ diag.error("unknown imports format");
+ return;
+ }
+}
+
+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;
+}
+
+static void getArchNames(const GradedArchs& archs, bool isOSBinary, char buffer[256])
+{
+ buffer[0] = '\0';
+ archs.forEachArch(isOSBinary, ^(const char* archName) {
+ if ( buffer[0] != '\0' )
+ strlcat(buffer, "' or '", 256);
+ strlcat(buffer, archName, 256);
+ });
+}
+
+const MachOFile* MachOFile::compatibleSlice(Diagnostics& diag, const void* fileContent, size_t contentSize, const char* path, Platform platform, bool isOSBinary, const GradedArchs& archs, bool internalInstall)
+{
+ 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 {
+ BLOCK_ACCCESSIBLE_ARRAY(char, gradedArchsBuf, 256);
+ getArchNames(archs, isOSBinary, gradedArchsBuf);
+
+ char strBuf[256];
+ diag.error("fat file, but missing compatible architecture (have '%s', need '%s')", ff->archNames(strBuf, contentSize), gradedArchsBuf);
+ return nullptr;
+ }
+ }
+ else {
+ mf = (MachOFile*)fileContent;
+ }
+
+ if ( !mf->hasMachOMagic() || !mf->isMachO(diag, contentSize) ) {
+ if ( diag.noError() )
+ diag.error("not a mach-o file");
+ return nullptr;
+ }
+
+ if ( archs.grade(mf->cputype, mf->cpusubtype, isOSBinary) == 0 ) {
+ BLOCK_ACCCESSIBLE_ARRAY(char, gradedArchsBuf, 256);
+ getArchNames(archs, isOSBinary, gradedArchsBuf);
+ diag.error("mach-o file, but is an incompatible architecture (have '%s', need '%s')", mf->archName(), gradedArchsBuf);
+ return nullptr;
+ }
+
+ if ( !mf->loadableIntoProcess(platform, path, internalInstall) ) {
+ __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;
+}
+
+const uint8_t* MachOFile::trieWalk(Diagnostics& diag, const uint8_t* start, const uint8_t* end, const char* symbol)
+{
+ STACK_ALLOC_OVERFLOW_SAFE_ARRAY(uint32_t, visitedNodeOffsets, 128);
+ visitedNodeOffsets.push_back(0);
+ const uint8_t* p = start;
+ while ( p < end ) {
+ uint64_t terminalSize = *p++;
+ if ( terminalSize > 127 ) {
+ // except for re-export-with-rename, all terminal sizes fit in one byte
+ --p;
+ terminalSize = read_uleb128(diag, p, end);
+ if ( diag.hasError() )
+ return nullptr;
+ }
+ if ( (*symbol == '\0') && (terminalSize != 0) ) {
+ return p;
+ }
+ const uint8_t* children = p + terminalSize;
+ if ( children > end ) {
+ //diag.error("malformed trie node, terminalSize=0x%llX extends past end of trie\n", terminalSize);
+ return nullptr;
+ }
+ uint8_t childrenRemaining = *children++;
+ p = children;
+ uint64_t nodeOffset = 0;
+ for (; childrenRemaining > 0; --childrenRemaining) {
+ const char* ss = symbol;
+ bool wrongEdge = false;
+ // scan whole edge to get to next edge
+ // if edge is longer than target symbol name, don't read past end of symbol name
+ char c = *p;
+ while ( c != '\0' ) {
+ if ( !wrongEdge ) {
+ if ( c != *ss )
+ wrongEdge = true;
+ ++ss;
+ }
+ ++p;
+ c = *p;
+ }
+ if ( wrongEdge ) {
+ // advance to next child
+ ++p; // skip over zero terminator
+ // skip over uleb128 until last byte is found
+ while ( (*p & 0x80) != 0 )
+ ++p;
+ ++p; // skip over last byte of uleb128
+ if ( p > end ) {
+ diag.error("malformed trie node, child node extends past end of trie\n");
+ return nullptr;
+ }
+ }
+ else {
+ // the symbol so far matches this edge (child)
+ // so advance to the child's node
+ ++p;
+ nodeOffset = read_uleb128(diag, p, end);
+ if ( diag.hasError() )
+ return nullptr;
+ if ( (nodeOffset == 0) || ( &start[nodeOffset] > end) ) {
+ diag.error("malformed trie child, nodeOffset=0x%llX out of range\n", nodeOffset);
+ return nullptr;
+ }
+ symbol = ss;
+ break;
+ }
+ }
+ if ( nodeOffset != 0 ) {
+ if ( nodeOffset > (uint64_t)(end-start) ) {
+ diag.error("malformed trie child, nodeOffset=0x%llX out of range\n", nodeOffset);
+ return nullptr;
+ }
+ // check for cycles
+ for (uint32_t aVisitedNodeOffset : visitedNodeOffsets) {
+ if ( aVisitedNodeOffset == nodeOffset ) {
+ diag.error("malformed trie child, cycle to nodeOffset=0x%llX\n", nodeOffset);
+ return nullptr;
+ }
+ }
+ visitedNodeOffsets.push_back((uint32_t)nodeOffset);
+ p = &start[nodeOffset];
+ }
+ else
+ p = end;
+ }
+ return nullptr;
+}
+
+void MachOFile::forEachRPath(void (^callback)(const char* rPath, bool& stop)) const
+{
+ Diagnostics diag;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_RPATH ) {
+ const char* rpath = (char*)cmd + ((struct rpath_command*)cmd)->path.offset;
+ callback(rpath, stop);
+ }
+ });
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+}
+
+
+bool MachOFile::inCodeSection(uint32_t runtimeOffset) const
+{
+ // only needed for arm64e code to know to sign pointers
+ if ( (this->cputype != CPU_TYPE_ARM64) || (this->maskedCpuSubtype() != CPU_SUBTYPE_ARM64E) )
+ return false;
+
+ __block bool result = false;
+ uint64_t baseAddress = this->preferredLoadAddress();
+ this->forEachSection(^(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop) {
+ if ( ((sectInfo.sectAddr-baseAddress) <= runtimeOffset) && (runtimeOffset < (sectInfo.sectAddr+sectInfo.sectSize-baseAddress)) ) {
+ result = ( (sectInfo.sectFlags & S_ATTR_PURE_INSTRUCTIONS) || (sectInfo.sectFlags & S_ATTR_SOME_INSTRUCTIONS) );
+ stop = true;
+ }
+ });
+ return result;
+}
+
+uint32_t MachOFile::dependentDylibCount(bool* allDepsAreNormalPtr) const
+{
+ __block uint32_t count = 0;
+ __block bool allDepsAreNormal = true;
+ forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
+ ++count;
+ if ( isWeak || isReExport || isUpward )
+ allDepsAreNormal = false;
+ });
+
+ if ( allDepsAreNormalPtr != nullptr )
+ *allDepsAreNormalPtr = allDepsAreNormal;
+ return count;
+}
+
+bool MachOFile::hasPlusLoadMethod(Diagnostics& diag) const
+{
+ __block bool result = false;
+
+ // in new objc runtime compiler puts classes/categories with +load method in specical section
+ forEachSection(^(const SectionInfo& info, bool malformedSectionRange, bool& stop) {
+ if ( strncmp(info.segInfo.segName, "__DATA", 6) != 0 )
+ return;
+ if ( (strcmp(info.sectName, "__objc_nlclslist") == 0) || (strcmp(info.sectName, "__objc_nlcatlist") == 0)) {
+ result = true;
+ stop = true;
+ }
+ });
+ return result;
+}
+
+uint32_t MachOFile::getFixupsLoadCommandFileOffset() const
+{
+ Diagnostics diag;
+ __block uint32_t fileOffset = 0;
+ this->forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ switch ( cmd->cmd ) {
+ case LC_DYLD_INFO:
+ case LC_DYLD_INFO_ONLY:
+ fileOffset = (uint32_t)( (uint8_t*)cmd - (uint8_t*)this );
+ break;
+ case LC_DYLD_CHAINED_FIXUPS:
+ fileOffset = (uint32_t)( (uint8_t*)cmd - (uint8_t*)this );
+ break;
+ }
+ });
+ if ( diag.hasError() )
+ return 0;
+
+ return fileOffset;
+}
+
+bool MachOFile::hasInitializer(Diagnostics& diag) const
+{
+ __block bool result = false;
+
+ // if dylib linked with -init linker option, that initializer is first
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( (cmd->cmd == LC_ROUTINES) || (cmd->cmd == LC_ROUTINES_64) ) {
+ result = true;
+ stop = true;
+ }
+ });
+
+ if ( result )
+ return true;
+
+ // next any function pointers in mod-init section
+ forEachInitializerPointerSection(diag, ^(uint32_t sectionOffset, uint32_t sectionSize, bool& stop) {
+ result = true;
+ stop = true;
+ });
+
+ if ( result )
+ return true;
+
+ forEachSection(^(const SectionInfo& info, bool malformedSectionRange, bool& stop) {
+ if ( (info.sectFlags & SECTION_TYPE) != S_INIT_FUNC_OFFSETS )
+ return;
+ result = true;
+ stop = true;
+ });
+
+ return result;
+}
+
+void MachOFile::forEachInitializerPointerSection(Diagnostics& diag, void (^callback)(uint32_t sectionOffset, uint32_t sectionSize, bool& stop)) const
+{
+ const unsigned ptrSize = pointerSize();
+ const uint64_t baseAddress = preferredLoadAddress();
+ forEachSection(^(const SectionInfo& info, bool malformedSectionRange, bool& sectStop) {
+ if ( (info.sectFlags & SECTION_TYPE) == S_MOD_INIT_FUNC_POINTERS ) {
+ if ( (info.sectSize % ptrSize) != 0 ) {
+ diag.error("initializer section %s/%s has bad size", info.segInfo.segName, info.sectName);
+ sectStop = true;
+ return;
+ }
+ if ( malformedSectionRange ) {
+ diag.error("initializer section %s/%s extends beyond its segment", info.segInfo.segName, info.sectName);
+ sectStop = true;
+ return;
+ }
+ if ( (info.sectAddr % ptrSize) != 0 ) {
+ diag.error("initializer section %s/%s is not pointer aligned", info.segInfo.segName, info.sectName);
+ sectStop = true;
+ return;
+ }
+ callback((uint32_t)(info.sectAddr - baseAddress), (uint32_t)info.sectSize, sectStop);
+ }
+ });
+}
+
+bool MachOFile::hasCodeSignature() const
+{
+ return this->hasLoadCommand(LC_CODE_SIGNATURE);
+}
+
+bool MachOFile::hasCodeSignature(uint32_t& fileOffset, uint32_t& size) const
+{
+ fileOffset = 0;
+ size = 0;
+
+ Diagnostics diag;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_CODE_SIGNATURE ) {
+ const linkedit_data_command* sigCmd = (linkedit_data_command*)cmd;
+ fileOffset = sigCmd->dataoff;
+ size = sigCmd->datasize;
+ stop = true;
+ }
+ });
+ diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
+
+ // early exist if no LC_CODE_SIGNATURE
+ if ( fileOffset == 0 )
+ return false;
+
+ // <rdar://problem/13622786> ignore code signatures in macOS binaries built with pre-10.9 tools
+ if ( (this->cputype == CPU_TYPE_X86_64) || (this->cputype == CPU_TYPE_I386) ) {
+ __block bool foundPlatform = false;
+ __block bool badSignature = false;
+ forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) {
+ foundPlatform = true;
+ if ( (platform == Platform::macOS) && (sdk < 0x000A0900) )
+ badSignature = true;
+ });
+ return foundPlatform && !badSignature;
+ }
+
+ return true;
+}
+
+uint64_t MachOFile::mappedSize() const
+{
+ uint64_t vmSpace;
+ bool hasZeroFill;
+ analyzeSegmentsLayout(vmSpace, hasZeroFill);
+ return vmSpace;
+}
+
+void MachOFile::analyzeSegmentsLayout(uint64_t& vmSpace, bool& hasZeroFill) const
+{
+ __block bool writeExpansion = false;
+ __block uint64_t lowestVmAddr = 0xFFFFFFFFFFFFFFFFULL;
+ __block uint64_t highestVmAddr = 0;
+ __block uint64_t sumVmSizes = 0;
+ forEachSegment(^(const SegmentInfo& segmentInfo, bool& stop) {
+ if ( strcmp(segmentInfo.segName, "__PAGEZERO") == 0 )
+ return;
+ if ( segmentInfo.writable() && (segmentInfo.fileSize != segmentInfo.vmSize) )
+ writeExpansion = true; // zerofill at end of __DATA
+ if ( segmentInfo.vmSize == 0 ) {
+ // Always zero fill if we have zero-sized segments
+ writeExpansion = true;
+ }
+ if ( segmentInfo.vmAddr < lowestVmAddr )
+ lowestVmAddr = segmentInfo.vmAddr;
+ if ( segmentInfo.vmAddr+segmentInfo.vmSize > highestVmAddr )
+ highestVmAddr = segmentInfo.vmAddr+segmentInfo.vmSize;
+ sumVmSizes += segmentInfo.vmSize;
+ });
+ uint64_t totalVmSpace = (highestVmAddr - lowestVmAddr);
+ // LINKEDIT vmSize is not required to be a multiple of page size. Round up if that is the case
+ const uint64_t pageSize = uses16KPages() ? 0x4000 : 0x1000;
+ totalVmSpace = (totalVmSpace + (pageSize - 1)) & ~(pageSize - 1);
+ bool hasHole = (totalVmSpace != sumVmSizes); // segments not contiguous
+
+ // The aux KC may have __DATA first, in which case we always want to vm_copy to the right place
+ bool hasOutOfOrderSegments = false;
+#if BUILDING_APP_CACHE_UTIL
+ uint64_t textSegVMAddr = preferredLoadAddress();
+ hasOutOfOrderSegments = textSegVMAddr != lowestVmAddr;
+#endif
+
+ vmSpace = totalVmSpace;
+ hasZeroFill = writeExpansion || hasHole || hasOutOfOrderSegments;
+}
+
+uint32_t MachOFile::segmentCount() const
+{
+ __block uint32_t count = 0;
+ forEachSegment(^(const SegmentInfo& info, bool& stop) {
+ ++count;
+ });
+ return count;
+}
+
+
+void MachOFile::forEachDOFSection(Diagnostics& diag, void (^callback)(uint32_t offset)) const
+{
+ forEachSection(^(const SectionInfo& info, bool malformedSectionRange, bool &stop) {
+ if ( ( (info.sectFlags & SECTION_TYPE) == S_DTRACE_DOF ) && !malformedSectionRange ) {
+ callback((uint32_t)(info.sectAddr - info.segInfo.vmAddr));
+ }
+ });
+}
+
+bool MachOFile::hasExportTrie(uint32_t& runtimeOffset, uint32_t& size) const
+{
+ __block uint64_t textUnslidVMAddr = 0;
+ __block uint64_t linkeditUnslidVMAddr = 0;
+ __block uint64_t linkeditFileOffset = 0;
+ forEachSegment(^(const SegmentInfo& info, bool& stop) {
+ if ( strcmp(info.segName, "__TEXT") == 0 ) {
+ textUnslidVMAddr = info.vmAddr;
+ } else if ( strcmp(info.segName, "__LINKEDIT") == 0 ) {
+ linkeditUnslidVMAddr = info.vmAddr;
+ linkeditFileOffset = info.fileOffset;
+ stop = true;
+ }
+ });
+
+ Diagnostics diag;
+ __block uint32_t fileOffset = ~0U;
+ this->forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ switch ( cmd->cmd ) {
+ case LC_DYLD_INFO:
+ case LC_DYLD_INFO_ONLY: {
+ const auto* dyldInfo = (const dyld_info_command*)cmd;
+ fileOffset = dyldInfo->export_off;
+ size = dyldInfo->export_size;
+ break;
+ }
+ case LC_DYLD_EXPORTS_TRIE: {
+ const auto* linkeditCmd = (const linkedit_data_command*)cmd;
+ fileOffset = linkeditCmd->dataoff;
+ size = linkeditCmd->datasize;
+ break;
+ }
+ }
+ });
+ if ( diag.hasError() )
+ return false;
+
+ if ( fileOffset == ~0U )
+ return false;
+
+ runtimeOffset = (uint32_t)((fileOffset - linkeditFileOffset) + (linkeditUnslidVMAddr - textUnslidVMAddr));
+ return true;
+}
+
+#if !TARGET_OS_EXCLAVEKIT
+// Note, this has to match the kernel
+static const uint32_t hashPriorities[] = {
+ CS_HASHTYPE_SHA1,
+ CS_HASHTYPE_SHA256_TRUNCATED,
+ CS_HASHTYPE_SHA256,
+ CS_HASHTYPE_SHA384,
+};
+
+static unsigned int hash_rank(const CS_CodeDirectory *cd)
+{
+ uint32_t type = cd->hashType;
+ for (uint32_t n = 0; n < sizeof(hashPriorities) / sizeof(hashPriorities[0]); ++n) {
+ if (hashPriorities[n] == type)
+ return n + 1;
+ }
+
+ /* not supported */
+ return 0;
+}
+
+// Note, this does NOT match the kernel.
+// On watchOS, in main executables, we will record all cd hashes then make sure
+// one of the ones we record matches the kernel.
+// This list is only for dylibs where we embed the cd hash in the closure instead of the
+// mod time and inode
+// This is sorted so that we choose sha1 first when checking dylibs
+static const uint32_t hashPriorities_watchOS_dylibs[] = {
+ CS_HASHTYPE_SHA256_TRUNCATED,
+ CS_HASHTYPE_SHA256,
+ CS_HASHTYPE_SHA384,
+ CS_HASHTYPE_SHA1
+};
+
+static unsigned int hash_rank_watchOS_dylibs(const CS_CodeDirectory *cd)
+{
+ uint32_t type = cd->hashType;
+ for (uint32_t n = 0; n < sizeof(hashPriorities_watchOS_dylibs) / sizeof(hashPriorities_watchOS_dylibs[0]); ++n) {
+ if (hashPriorities_watchOS_dylibs[n] == type)
+ return n + 1;
+ }
+
+ /* not supported */
+ return 0;
+}
+
+// This calls the callback for all code directories required for a given platform/binary combination.
+// On watchOS main executables this is all cd hashes.
+// On watchOS dylibs this is only the single cd hash we need (by rank defined by dyld, not the kernel).
+// On all other platforms this always returns a single best cd hash (ranked to match the kernel).
+// Note the callback parameter is really a CS_CodeDirectory.
+void MachOFile::forEachCodeDirectoryBlob(const void* codeSigStart, size_t codeSignLen,
+ void (^callback)(const void* cd)) const
+{
+ // verify min length of overall code signature
+ if ( codeSignLen < sizeof(CS_SuperBlob) )
+ return;
+
+ // verify magic at start
+ const CS_SuperBlob* codeSuperBlob = (CS_SuperBlob*)codeSigStart;
+ if ( codeSuperBlob->magic != htonl(CSMAGIC_EMBEDDED_SIGNATURE) )
+ return;
+
+ // verify count of sub-blobs not too large
+ uint32_t subBlobCount = htonl(codeSuperBlob->count);
+ if ( (codeSignLen-sizeof(CS_SuperBlob))/sizeof(CS_BlobIndex) < subBlobCount )
+ return;
+
+ // Note: The kernel sometimes chooses sha1 on watchOS, and sometimes sha256.
+ // Embed all of them so that we just need to match any of them
+ const bool isWatchOS = this->builtForPlatform(Platform::watchOS);
+ const bool isMainExecutable = this->isMainExecutable();
+ auto hashRankFn = isWatchOS ? &hash_rank_watchOS_dylibs : &hash_rank;
+
+ // walk each sub blob, looking at ones with type CSSLOT_CODEDIRECTORY
+ const CS_CodeDirectory* bestCd = nullptr;
+ for (uint32_t i=0; i < subBlobCount; ++i) {
+ if ( codeSuperBlob->index[i].type == htonl(CSSLOT_CODEDIRECTORY) ) {
+ // Ok, this is the regular code directory
+ } else if ( codeSuperBlob->index[i].type >= htonl(CSSLOT_ALTERNATE_CODEDIRECTORIES) && codeSuperBlob->index[i].type <= htonl(CSSLOT_ALTERNATE_CODEDIRECTORY_LIMIT)) {
+ // Ok, this is the alternative code directory
+ } else {
+ continue;
+ }
+ uint32_t cdOffset = htonl(codeSuperBlob->index[i].offset);
+ // verify offset is not out of range
+ if ( cdOffset > (codeSignLen - sizeof(CS_CodeDirectory)) )
+ continue;
+ const CS_CodeDirectory* cd = (CS_CodeDirectory*)((uint8_t*)codeSuperBlob + cdOffset);
+ uint32_t cdLength = htonl(cd->length);
+ // verify code directory length not out of range
+ if ( cdLength > (codeSignLen - cdOffset) )
+ continue;
+
+ // The watch main executable wants to know about all cd hashes
+ if ( isWatchOS && isMainExecutable ) {
+ callback(cd);
+ continue;
+ }
+
+ if ( cd->magic == htonl(CSMAGIC_CODEDIRECTORY) ) {
+ if ( !bestCd || (hashRankFn(cd) > hashRankFn(bestCd)) )
+ bestCd = cd;
+ }
+ }
+
+ // Note this callback won't happen on watchOS as that one was done in the loop
+ if ( bestCd != nullptr )
+ callback(bestCd);
+}
+
+void MachOFile::forEachCDHashOfCodeSignature(const void* codeSigStart, size_t codeSignLen,
+ void (^callback)(const uint8_t cdHash[20])) const
+{
+ forEachCodeDirectoryBlob(codeSigStart, codeSignLen, ^(const void *cdBuffer) {
+ const CS_CodeDirectory* cd = (const CS_CodeDirectory*)cdBuffer;
+ uint32_t cdLength = htonl(cd->length);
+ uint8_t cdHash[20];
+ if ( cd->hashType == CS_HASHTYPE_SHA384 ) {
+ uint8_t digest[CCSHA384_OUTPUT_SIZE];
+ const struct ccdigest_info* di = ccsha384_di();
+ ccdigest_di_decl(di, tempBuf); // declares tempBuf array in stack
+ ccdigest_init(di, tempBuf);
+ ccdigest_update(di, tempBuf, cdLength, cd);
+ ccdigest_final(di, tempBuf, digest);
+ ccdigest_di_clear(di, tempBuf);
+ // cd-hash of sigs that use SHA384 is the first 20 bytes of the SHA384 of the code digest
+ memcpy(cdHash, digest, 20);
+ callback(cdHash);
+ return;
+ }
+ else if ( (cd->hashType == CS_HASHTYPE_SHA256) || (cd->hashType == CS_HASHTYPE_SHA256_TRUNCATED) ) {
+ uint8_t digest[CCSHA256_OUTPUT_SIZE];
+ const struct ccdigest_info* di = ccsha256_di();
+ ccdigest_di_decl(di, tempBuf); // declares tempBuf array in stack
+ ccdigest_init(di, tempBuf);
+ ccdigest_update(di, tempBuf, cdLength, cd);
+ ccdigest_final(di, tempBuf, digest);
+ ccdigest_di_clear(di, tempBuf);
+ // cd-hash of sigs that use SHA256 is the first 20 bytes of the SHA256 of the code digest
+ memcpy(cdHash, digest, 20);
+ callback(cdHash);
+ return;
+ }
+ else if ( cd->hashType == CS_HASHTYPE_SHA1 ) {
+ // compute hash directly into return buffer
+ const struct ccdigest_info* di = ccsha1_di();
+ ccdigest_di_decl(di, tempBuf); // declares tempBuf array in stack
+ ccdigest_init(di, tempBuf);
+ ccdigest_update(di, tempBuf, cdLength, cd);
+ ccdigest_final(di, tempBuf, cdHash);
+ ccdigest_di_clear(di, tempBuf);
+ callback(cdHash);
+ return;
+ }
+ });
+}
+#endif // !TARGET_OS_EXCLAVEKIT
+
+// These are mangled symbols for all the variants of operator new and delete
+// which a main executable can define (non-weak) and override the
+// weak-def implementation in the OS.
+static const char* const sTreatAsWeak[] = {
+ "__Znwm", "__ZnwmRKSt9nothrow_t",
+ "__Znam", "__ZnamRKSt9nothrow_t",
+ "__ZdlPv", "__ZdlPvRKSt9nothrow_t", "__ZdlPvm",
+ "__ZdaPv", "__ZdaPvRKSt9nothrow_t", "__ZdaPvm",
+ "__ZnwmSt11align_val_t", "__ZnwmSt11align_val_tRKSt9nothrow_t",
+ "__ZnamSt11align_val_t", "__ZnamSt11align_val_tRKSt9nothrow_t",
+ "__ZdlPvSt11align_val_t", "__ZdlPvSt11align_val_tRKSt9nothrow_t", "__ZdlPvmSt11align_val_t",
+ "__ZdaPvSt11align_val_t", "__ZdaPvSt11align_val_tRKSt9nothrow_t", "__ZdaPvmSt11align_val_t",
+ "__ZnwmSt19__type_descriptor_t", "__ZnamSt19__type_descriptor_t"
+};
+
+void MachOFile::forEachTreatAsWeakDef(void (^handler)(const char* symbolName))
+{
+ for (const char* sym : sTreatAsWeak)
+ handler(sym);
+}
+
+MachOFile::PointerMetaData::PointerMetaData()
+{
+ this->diversity = 0;
+ this->high8 = 0;
+ this->authenticated = 0;
+ this->key = 0;
+ this->usesAddrDiversity = 0;
+}
+
+MachOFile::PointerMetaData::PointerMetaData(const ChainedFixupPointerOnDisk* fixupLoc, uint16_t pointer_format)
+{
+ this->diversity = 0;
+ this->high8 = 0;
+ this->authenticated = 0;
+ this->key = 0;
+ this->usesAddrDiversity = 0;
+ switch ( pointer_format ) {
+ case DYLD_CHAINED_PTR_ARM64E:
+ case DYLD_CHAINED_PTR_ARM64E_KERNEL:
+ case DYLD_CHAINED_PTR_ARM64E_USERLAND:
+ case DYLD_CHAINED_PTR_ARM64E_FIRMWARE:
+ case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
+ this->authenticated = fixupLoc->arm64e.authRebase.auth;
+ if ( this->authenticated ) {
+ this->key = fixupLoc->arm64e.authRebase.key;
+ this->usesAddrDiversity = fixupLoc->arm64e.authRebase.addrDiv;
+ this->diversity = fixupLoc->arm64e.authRebase.diversity;
+ }
+ else if ( fixupLoc->arm64e.bind.bind == 0 ) {
+ this->high8 = fixupLoc->arm64e.rebase.high8;
+ }
+ break;
+ case DYLD_CHAINED_PTR_64:
+ case DYLD_CHAINED_PTR_64_OFFSET:
+ if ( fixupLoc->generic64.bind.bind == 0 )
+ this->high8 = fixupLoc->generic64.rebase.high8;
+ break;
+ }
+}
+
+bool MachOFile::PointerMetaData::operator==(const PointerMetaData& other) const
+{
+ return (this->diversity == other.diversity)
+ && (this->high8 == other.high8)
+ && (this->authenticated == other.authenticated)
+ && (this->key == other.key)
+ && (this->usesAddrDiversity == other.usesAddrDiversity);
+}
+
+#if !SUPPORT_VM_LAYOUT
+bool MachOFile::getLinkeditLayout(Diagnostics& diag, mach_o::LinkeditLayout& layout) const
+{
+ // Note, in file layout all linkedit offsets are just file offsets.
+ // It is essential no-one calls this on a MachOLoaded or MachOAnalyzer
+
+ // FIXME: Other load commands
+ this->forEachLoadCommand(diag, ^(const load_command *cmd, bool &stop) {
+ switch ( cmd->cmd ) {
+ case LC_SYMTAB: {
+ const symtab_command* symTabCmd = (const symtab_command*)cmd;
+
+ // Record that we found a LC_SYMTAB
+ layout.hasSymTab = true;
+
+ // NList
+ uint64_t nlistEntrySize = this->is64() ? sizeof(struct nlist_64) : sizeof(struct nlist);
+ layout.symbolTable.fileOffset = symTabCmd->symoff;
+ layout.symbolTable.buffer = (uint8_t*)this + symTabCmd->symoff;
+ layout.symbolTable.bufferSize = (uint32_t)(symTabCmd->nsyms * nlistEntrySize);
+ layout.symbolTable.entryCount = symTabCmd->nsyms;
+ layout.symbolTable.hasLinkedit = true;
+
+ // Symbol strings
+ layout.symbolStrings.fileOffset = symTabCmd->stroff;
+ layout.symbolStrings.buffer = (uint8_t*)this + symTabCmd->stroff;
+ layout.symbolStrings.bufferSize = symTabCmd->strsize;
+ layout.symbolStrings.hasLinkedit = true;
+ break;
+ }
+ case LC_DYSYMTAB: {
+ const dysymtab_command* dynSymTabCmd = (const dysymtab_command*)cmd;
+
+ // Record that we found a LC_DYSYMTAB
+ layout.hasDynSymTab = true;
+
+ // Local relocs
+ layout.localRelocs.fileOffset = dynSymTabCmd->locreloff;
+ layout.localRelocs.buffer = (uint8_t*)this + dynSymTabCmd->locreloff;
+ layout.localRelocs.bufferSize = 0; // Use entryCount instead
+ layout.localRelocs.entryIndex = 0; // Use buffer instead
+ layout.localRelocs.entryCount = dynSymTabCmd->nlocrel;
+ layout.localRelocs.hasLinkedit = true;
+
+ // Extern relocs
+ layout.externRelocs.fileOffset = dynSymTabCmd->extreloff;
+ layout.externRelocs.buffer = (uint8_t*)this + dynSymTabCmd->extreloff;
+ layout.externRelocs.bufferSize = 0; // Use entryCount instead
+ layout.externRelocs.entryIndex = 0; // Use buffer instead
+ layout.externRelocs.entryCount = dynSymTabCmd->nextrel;
+ layout.externRelocs.hasLinkedit = true;
+
+ // Indirect symbol table
+ layout.indirectSymbolTable.fileOffset = dynSymTabCmd->indirectsymoff;
+ layout.indirectSymbolTable.buffer = (uint8_t*)this + dynSymTabCmd->indirectsymoff;
+ layout.indirectSymbolTable.bufferSize = 0; // Use entryCount instead
+ layout.indirectSymbolTable.entryIndex = 0; // Use buffer instead
+ layout.indirectSymbolTable.entryCount = dynSymTabCmd->nindirectsyms;
+ layout.indirectSymbolTable.hasLinkedit = true;
+
+ // Locals
+ layout.localSymbolTable.fileOffset = 0; // unused
+ layout.localSymbolTable.buffer = nullptr; // Use entryIndex instead
+ layout.localSymbolTable.bufferSize = 0; // Use entryCount instead
+ layout.localSymbolTable.entryIndex = dynSymTabCmd->ilocalsym;
+ layout.localSymbolTable.entryCount = dynSymTabCmd->nlocalsym;
+ layout.localSymbolTable.hasLinkedit = true;
+
+ // Globals
+ layout.globalSymbolTable.fileOffset = 0; // unused
+ layout.globalSymbolTable.buffer = nullptr; // Use entryIndex instead
+ layout.globalSymbolTable.bufferSize = 0; // Use entryCount instead
+ layout.globalSymbolTable.entryIndex = dynSymTabCmd->iextdefsym;
+ layout.globalSymbolTable.entryCount = dynSymTabCmd->nextdefsym;
+ layout.globalSymbolTable.hasLinkedit = true;
+
+ // Imports
+ layout.undefSymbolTable.fileOffset = 0; // unused
+ layout.undefSymbolTable.buffer = nullptr; // Use entryIndex instead
+ layout.undefSymbolTable.bufferSize = 0; // Use entryCount instead
+ layout.undefSymbolTable.entryIndex = dynSymTabCmd->iundefsym;
+ layout.undefSymbolTable.entryCount = dynSymTabCmd->nundefsym;
+ layout.undefSymbolTable.hasLinkedit = true;
+ break;
+ }
+ case LC_DYLD_INFO:
+ case LC_DYLD_INFO_ONLY: {
+ const dyld_info_command* linkeditCmd = (const dyld_info_command*)cmd;
+
+ // Record what kind of DYLD_INFO we found
+ layout.dyldInfoCmd = cmd->cmd;
+
+ // Rebase
+ layout.rebaseOpcodes.fileOffset = linkeditCmd->rebase_off;
+ layout.rebaseOpcodes.buffer = (uint8_t*)this + linkeditCmd->rebase_off;
+ layout.rebaseOpcodes.bufferSize = linkeditCmd->rebase_size;
+ layout.rebaseOpcodes.hasLinkedit = true;
+
+ // Bind
+ layout.regularBindOpcodes.fileOffset = linkeditCmd->bind_off;
+ layout.regularBindOpcodes.buffer = (uint8_t*)this + linkeditCmd->bind_off;
+ layout.regularBindOpcodes.bufferSize = linkeditCmd->bind_size;
+ layout.regularBindOpcodes.hasLinkedit = true;
+
+ // Lazy bind
+ layout.lazyBindOpcodes.fileOffset = linkeditCmd->lazy_bind_off;
+ layout.lazyBindOpcodes.buffer = (uint8_t*)this + linkeditCmd->lazy_bind_off;
+ layout.lazyBindOpcodes.bufferSize = linkeditCmd->lazy_bind_size;
+ layout.lazyBindOpcodes.hasLinkedit = true;
+
+ // Weak bind
+ layout.weakBindOpcodes.fileOffset = linkeditCmd->weak_bind_off;
+ layout.weakBindOpcodes.buffer = (uint8_t*)this + linkeditCmd->weak_bind_off;
+ layout.weakBindOpcodes.bufferSize = linkeditCmd->weak_bind_size;
+ layout.weakBindOpcodes.hasLinkedit = true;
+
+ // Export trie
+ layout.exportsTrie.fileOffset = linkeditCmd->export_off;
+ layout.exportsTrie.buffer = (uint8_t*)this + linkeditCmd->export_off;
+ layout.exportsTrie.bufferSize = linkeditCmd->export_size;
+ layout.exportsTrie.hasLinkedit = true;
+ break;
+ }
+ case LC_DYLD_CHAINED_FIXUPS: {
+ const linkedit_data_command* linkeditCmd = (const linkedit_data_command*)cmd;
+
+ layout.chainedFixups.fileOffset = linkeditCmd->dataoff;
+ layout.chainedFixups.buffer = (uint8_t*)this + linkeditCmd->dataoff;
+ layout.chainedFixups.bufferSize = linkeditCmd->datasize;
+ layout.chainedFixups.entryCount = 0; // Not needed here
+ layout.chainedFixups.hasLinkedit = true;
+ layout.chainedFixups.cmd = linkeditCmd;
+ break;
+ }
+ case LC_DYLD_EXPORTS_TRIE: {
+ const linkedit_data_command* linkeditCmd = (const linkedit_data_command*)cmd;
+
+ layout.exportsTrie.fileOffset = linkeditCmd->dataoff;
+ layout.exportsTrie.buffer = (uint8_t*)this + linkeditCmd->dataoff;
+ layout.exportsTrie.bufferSize = linkeditCmd->datasize;
+ layout.exportsTrie.entryCount = 0; // Not needed here
+ layout.exportsTrie.hasLinkedit = true;
+ break;
+ }
+ case LC_SEGMENT_SPLIT_INFO: {
+ const linkedit_data_command* linkeditCmd = (const linkedit_data_command*)cmd;
+
+ layout.splitSegInfo.fileOffset = linkeditCmd->dataoff;
+ layout.splitSegInfo.buffer = (uint8_t*)this + linkeditCmd->dataoff;
+ layout.splitSegInfo.bufferSize = linkeditCmd->datasize;
+ layout.splitSegInfo.entryCount = 0; // Not needed here
+ layout.splitSegInfo.hasLinkedit = true;
+ break;
+ }
+ case LC_FUNCTION_STARTS: {
+ const linkedit_data_command* linkeditCmd = (const linkedit_data_command*)cmd;
+
+ layout.functionStarts.fileOffset = linkeditCmd->dataoff;
+ layout.functionStarts.buffer = (uint8_t*)this + linkeditCmd->dataoff;
+ layout.functionStarts.bufferSize = linkeditCmd->datasize;
+ layout.functionStarts.entryCount = 0; // Not needed here
+ layout.functionStarts.hasLinkedit = true;
+ break;
+ }
+ case LC_DATA_IN_CODE: {
+ const linkedit_data_command* linkeditCmd = (const linkedit_data_command*)cmd;
+
+ layout.dataInCode.fileOffset = linkeditCmd->dataoff;
+ layout.dataInCode.buffer = (uint8_t*)this + linkeditCmd->dataoff;
+ layout.dataInCode.bufferSize = linkeditCmd->datasize;
+ layout.dataInCode.entryCount = 0; // Not needed here
+ layout.dataInCode.hasLinkedit = true;
+ break;
+ }
+ case LC_CODE_SIGNATURE: {
+ const linkedit_data_command* linkeditCmd = (const linkedit_data_command*)cmd;
+
+ layout.codeSignature.fileOffset = linkeditCmd->dataoff;
+ layout.codeSignature.buffer = (uint8_t*)this + linkeditCmd->dataoff;
+ layout.codeSignature.bufferSize = linkeditCmd->datasize;
+ layout.codeSignature.entryCount = 0; // Not needed here
+ layout.codeSignature.hasLinkedit = true;
+ break;
+ }
+ }
+ });
+
+ return true;
+}
+
+void MachOFile::withFileLayout(Diagnostics &diag, void (^callback)(const mach_o::Layout &layout)) const
+{
+ // Use the fixups from the source dylib
+ mach_o::LinkeditLayout linkedit;
+ if ( !this->getLinkeditLayout(diag, linkedit) ) {
+ diag.error("Couldn't get dylib layout");
+ return;
+ }
+
+ uint32_t numSegments = this->segmentCount();
+ BLOCK_ACCCESSIBLE_ARRAY(mach_o::SegmentLayout, segmentLayout, numSegments);
+ this->forEachSegment(^(const SegmentInfo &info, bool &stop) {
+ mach_o::SegmentLayout segment;
+ segment.vmAddr = info.vmAddr;
+ segment.vmSize = info.vmSize;
+ segment.fileOffset = info.fileOffset;
+ segment.fileSize = info.fileSize;
+ segment.buffer = (uint8_t*)this + info.fileOffset;
+ segment.protections = info.protections;
+
+ segment.kind = mach_o::SegmentLayout::Kind::unknown;
+ if ( !strcmp(info.segName, "__TEXT") ) {
+ segment.kind = mach_o::SegmentLayout::Kind::text;
+ } else if ( !strcmp(info.segName, "__LINKEDIT") ) {
+ segment.kind = mach_o::SegmentLayout::Kind::linkedit;
+ }
+
+ segmentLayout[info.segIndex] = segment;
+ });
+
+ mach_o::Layout layout(this, { &segmentLayout[0], &segmentLayout[numSegments] }, linkedit);
+ callback(layout);
+}
+#endif // !SUPPORT_VM_LAYOUT
+
+bool MachOFile::hasObjCMessageReferences() const {
+
+ __block bool foundSection = false;
+ forEachSection(^(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop) {
+ if ( strncmp(sectInfo.segInfo.segName, "__DATA", 6) != 0 )
+ return;
+ if ( strcmp(sectInfo.sectName, "__objc_msgrefs") != 0 )
+ return;
+ foundSection = true;
+ stop = true;
+ });
+ return foundSection;
+}
+
+uint32_t MachOFile::loadCommandsFreeSpace() const
+{
+ __block uint32_t firstSectionFileOffset = 0;
+ __block uint32_t firstSegmentFileOffset = 0;
+ forEachSection(^(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop) {
+ firstSectionFileOffset = sectInfo.sectFileOffset;
+ firstSegmentFileOffset = (uint32_t)sectInfo.segInfo.fileOffset;
+ stop = true;
+ });
+
+ uint32_t headerSize = (this->magic == MH_MAGIC_64) ? sizeof(mach_header_64) : sizeof(mach_header);
+ uint32_t existSpaceUsed = this->sizeofcmds + headerSize;
+ return firstSectionFileOffset - firstSegmentFileOffset - existSpaceUsed;
+}
+
+bool MachOFile::findObjCDataSection(const char *sectionName, uint64_t& sectionRuntimeOffset, uint64_t& sectionSize) const
+{
+ uint64_t baseAddress = preferredLoadAddress();
+
+ __block bool foundSection = false;
+ forEachSection(^(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop) {
+ if ( (strcmp(sectInfo.segInfo.segName, "__DATA") != 0) &&
+ (strcmp(sectInfo.segInfo.segName, "__DATA_CONST") != 0) &&
+ (strcmp(sectInfo.segInfo.segName, "__DATA_DIRTY") != 0) )
+ return;
+ if ( strcmp(sectInfo.sectName, sectionName) != 0 )
+ return;
+ foundSection = true;
+ sectionRuntimeOffset = sectInfo.sectAddr - baseAddress;
+ sectionSize = sectInfo.sectSize;
+ stop = true;
+ });
+ return foundSection;
+}
+
+bool MachOFile::enforceFormat(Malformed kind) const
+{
+ // TODO: Add a mapping from generic releases to platform versions
+#if BUILDING_DYLDINFO || BUILDING_APP_CACHE_UTIL || BUILDING_RUN_STATIC
+ // HACK: If we are the kernel, we have a different format to enforce
+ if ( isFileSet() ) {
+ bool result = false;
+ switch (kind) {
+ case Malformed::linkeditOrder:
+ case Malformed::linkeditAlignment:
+ case Malformed::dyldInfoAndlocalRelocs:
+ result = true;
+ break;
+ case Malformed::segmentOrder:
+ // The aux KC has __DATA first
+ result = false;
+ break;
+ case Malformed::linkeditPermissions:
+ case Malformed::executableData:
+ case Malformed::writableData:
+ case Malformed::codeSigAlignment:
+ case Malformed::sectionsAddrRangeWithinSegment:
+ case Malformed::loaderPathsAreReal:
+ case Malformed::mainExecInDyldCache:
+ result = true;
+ break;
+ case Malformed::noLinkedDylibs:
+ case Malformed::textPermissions:
+ // The kernel has its own __TEXT_EXEC for executable memory
+ result = false;
+ break;
+ case Malformed::noUUID:
+ case Malformed::zerofillSwiftMetadata:
+ case Malformed::sdkOnOrAfter2021:
+ case Malformed::sdkOnOrAfter2022:
+ result = true;
+ break;
+ }
+ return result;
+ }
+
+ if ( isStaticExecutable() ) {
+ bool result = false;
+ switch (kind) {
+ case Malformed::linkeditOrder:
+ case Malformed::linkeditAlignment:
+ case Malformed::dyldInfoAndlocalRelocs:
+ result = true;
+ break;
+ case Malformed::segmentOrder:
+ case Malformed::textPermissions:
+ result = false;
+ break;
+ case Malformed::linkeditPermissions:
+ case Malformed::executableData:
+ case Malformed::codeSigAlignment:
+ case Malformed::sectionsAddrRangeWithinSegment:
+ case Malformed::loaderPathsAreReal:
+ case Malformed::mainExecInDyldCache:
+ result = true;
+ break;
+ case Malformed::noLinkedDylibs:
+ case Malformed::writableData:
+ case Malformed::noUUID:
+ case Malformed::zerofillSwiftMetadata:
+ case Malformed::sdkOnOrAfter2021:
+ case Malformed::sdkOnOrAfter2022:
+ // The kernel has __DATA_CONST marked as r/o
+ result = false;
+ break;
+ }
+ return result;
+ }
+
+#endif
+
+ __block bool result = false;
+ forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) {
+ switch (platform) {
+ case Platform::macOS:
+ switch (kind) {
+ case Malformed::linkeditOrder:
+ case Malformed::linkeditAlignment:
+ case Malformed::dyldInfoAndlocalRelocs:
+ // enforce these checks on new binaries only
+ if (sdk >= 0x000A0E00) // macOS 10.14
+ result = true;
+ break;
+ case Malformed::segmentOrder:
+ case Malformed::linkeditPermissions:
+ case Malformed::textPermissions:
+ case Malformed::executableData:
+ case Malformed::writableData:
+ case Malformed::codeSigAlignment:
+ // enforce these checks on new binaries only
+ if (sdk >= 0x000A0F00) // macOS 10.15
+ result = true;
+ break;
+ case Malformed::sectionsAddrRangeWithinSegment:
+ // enforce these checks on new binaries only
+ if (sdk >= 0x000A1000) // macOS 10.16
+ result = true;
+ break;
+ case Malformed::noLinkedDylibs:
+ case Malformed::loaderPathsAreReal:
+ case Malformed::mainExecInDyldCache:
+ case Malformed::zerofillSwiftMetadata:
+ case Malformed::sdkOnOrAfter2021:
+ // enforce these checks on new binaries only
+ if (sdk >= 0x000D0000) // macOS 13.0
+ result = true;
+ break;
+ case Malformed::noUUID:
+ case Malformed::sdkOnOrAfter2022:
+ if (sdk >= 0x000E0000) // macOS 14.0 FIXME
+ result = true;
+ break;
+ }
+ break;
+ case Platform::iOS:
+ case Platform::tvOS:
+ case Platform::iOSMac:
+ switch (kind) {
+ case Malformed::linkeditOrder:
+ case Malformed::dyldInfoAndlocalRelocs:
+ case Malformed::textPermissions:
+ case Malformed::executableData:
+ case Malformed::writableData:
+ result = true;
+ break;
+ case Malformed::linkeditAlignment:
+ case Malformed::segmentOrder:
+ case Malformed::linkeditPermissions:
+ case Malformed::codeSigAlignment:
+ // enforce these checks on new binaries only
+ if (sdk >= 0x000D0000) // iOS 13
+ result = true;
+ break;
+ case Malformed::sectionsAddrRangeWithinSegment:
+ // enforce these checks on new binaries only
+ if (sdk >= 0x000E0000) // iOS 14
+ result = true;
+ break;
+ case Malformed::noLinkedDylibs:
+ case Malformed::loaderPathsAreReal:
+ case Malformed::mainExecInDyldCache:
+ case Malformed::zerofillSwiftMetadata:
+ case Malformed::sdkOnOrAfter2021:
+ // enforce these checks on new binaries only
+ if (sdk >= 0x00100000) // iOS 16
+ result = true;
+ break;
+ case Malformed::noUUID:
+ case Malformed::sdkOnOrAfter2022:
+ if (sdk >= 0x00110000) // iOS 17.0 FIXME
+ result = true;
+ break;
+ }
+ break;
+ case Platform::watchOS:
+ switch (kind) {
+ case Malformed::linkeditOrder:
+ case Malformed::dyldInfoAndlocalRelocs:
+ case Malformed::textPermissions:
+ case Malformed::executableData:
+ case Malformed::writableData:
+ result = true;
+ break;
+ case Malformed::linkeditAlignment:
+ case Malformed::segmentOrder:
+ case Malformed::linkeditPermissions:
+ case Malformed::codeSigAlignment:
+ case Malformed::sectionsAddrRangeWithinSegment:
+ case Malformed::noLinkedDylibs:
+ case Malformed::loaderPathsAreReal:
+ case Malformed::mainExecInDyldCache:
+ case Malformed::zerofillSwiftMetadata:
+ case Malformed::sdkOnOrAfter2021:
+ // enforce these checks on new binaries only
+ if (sdk >= 0x00090000) // watchOS 9
+ result = true;
+ break;
+ case Malformed::noUUID:
+ case Malformed::sdkOnOrAfter2022:
+ if (sdk >= 0x000A0000) // watchOS 10 FIXME
+ result = true;
+ break;
+ }
+ break;
+ case Platform::driverKit:
+ result = true;
+ break;
+ default:
+ result = true;
+ break;
+ }
+ });
+ // if binary is so old, there is no platform info, don't enforce malformed errors
+ return result;
+}
+
+bool MachOFile::validSegments(Diagnostics& diag, const char* path, size_t fileLen) const
+{
+ // check segment load command size
+ __block bool badSegmentLoadCommand = false;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_SEGMENT_64 ) {
+ const segment_command_64* seg = (segment_command_64*)cmd;
+ int32_t sectionsSpace = cmd->cmdsize - sizeof(segment_command_64);
+ if ( sectionsSpace < 0 ) {
+ diag.error("in '%s' load command size too small for LC_SEGMENT_64", path);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ else if ( (sectionsSpace % sizeof(section_64)) != 0 ) {
+ diag.error("in '%s' segment load command size 0x%X will not fit whole number of sections", path, cmd->cmdsize);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ else if ( sectionsSpace != (int32_t)(seg->nsects * sizeof(section_64)) ) {
+ diag.error("in '%s' load command size 0x%X does not match nsects %d", path, cmd->cmdsize, seg->nsects);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ else if ( greaterThanAddOrOverflow(seg->fileoff, seg->filesize, fileLen) ) {
+ diag.error("in '%s' segment load command content extends beyond end of file", path);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ else if ( (seg->filesize > seg->vmsize) && ((seg->vmsize != 0) || ((seg->flags & SG_NORELOC) == 0)) ) {
+ // <rdar://problem/19986776> dyld should support non-allocatable __LLVM segment
+ diag.error("in '%s' segment '%s' filesize exceeds vmsize", path, seg->segname);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ }
+ else if ( cmd->cmd == LC_SEGMENT ) {
+ const segment_command* seg = (segment_command*)cmd;
+ int32_t sectionsSpace = cmd->cmdsize - sizeof(segment_command);
+ if ( sectionsSpace < 0 ) {
+ diag.error("in '%s' load command size too small for LC_SEGMENT", path);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ else if ( (sectionsSpace % sizeof(section)) != 0 ) {
+ diag.error("in '%s' segment load command size 0x%X will not fit whole number of sections", path, cmd->cmdsize);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ else if ( sectionsSpace != (int32_t)(seg->nsects * sizeof(section)) ) {
+ diag.error("in '%s' load command size 0x%X does not match nsects %d", path, cmd->cmdsize, seg->nsects);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ else if ( (seg->filesize > seg->vmsize) && ((seg->vmsize != 0) || ((seg->flags & SG_NORELOC) == 0)) ) {
+ // <rdar://problem/19986776> dyld should support non-allocatable __LLVM segment
+ diag.error("in '%s' segment '%s' filesize exceeds vmsize", path, seg->segname);
+ badSegmentLoadCommand = true;
+ stop = true;
+ }
+ }
+ });
+ if ( badSegmentLoadCommand )
+ return false;
+
+ // check mapping permissions of segments
+ __block bool badPermissions = false;
+ __block bool badSize = false;
+ __block bool hasTEXT = false;
+ __block bool hasLINKEDIT = false;
+ forEachSegment(^(const SegmentInfo& info, bool& stop) {
+ if ( strcmp(info.segName, "__TEXT") == 0 ) {
+ if ( (info.protections != (VM_PROT_READ|VM_PROT_EXECUTE)) && enforceFormat(Malformed::textPermissions) ) {
+ diag.error("in '%s' __TEXT segment permissions is not 'r-x'", path);
+ badPermissions = true;
+ stop = true;
+ }
+ hasTEXT = true;
+ }
+ else if ( strcmp(info.segName, "__LINKEDIT") == 0 ) {
+ if ( (info.protections != VM_PROT_READ) && enforceFormat(Malformed::linkeditPermissions) ) {
+ diag.error("in '%s' __LINKEDIT segment permissions is not 'r--'", path);
+ badPermissions = true;
+ stop = true;
+ }
+ hasLINKEDIT = true;
+ }
+ else if ( (info.protections & 0xFFFFFFF8) != 0 ) {
+ diag.error("in '%s' %s segment permissions has invalid bits set", path, info.segName);
+ badPermissions = true;
+ stop = true;
+ }
+ if ( greaterThanAddOrOverflow(info.fileOffset, info.fileSize, fileLen) ) {
+ diag.error("in '%s' %s segment content extends beyond end of file", path, info.segName);
+ badSize = true;
+ stop = true;
+ }
+ if ( is64() ) {
+ if ( info.vmAddr+info.vmSize < info.vmAddr ) {
+ diag.error("in '%s' %s segment vm range wraps", path, info.segName);
+ badSize = true;
+ stop = true;
+ }
+ }
+ else {
+ if ( (uint32_t)(info.vmAddr+info.vmSize) < (uint32_t)(info.vmAddr) ) {
+ diag.error("in '%s' %s segment vm range wraps", path, info.segName);
+ badSize = true;
+ stop = true;
+ }
+ }
+ });
+ if ( badPermissions || badSize )
+ return false;
+ if ( !hasTEXT ) {
+ diag.error("in '%s' missing __TEXT segment", path);
+ return false;
+ }
+ if ( !hasLINKEDIT && !this->isPreload() ) {
+ diag.error("in '%s' missing __LINKEDIT segment", path);
+ return false;
+ }
+
+ // check for overlapping segments
+ __block bool badSegments = false;
+ forEachSegment(^(const SegmentInfo& info1, bool& stop1) {
+ uint64_t seg1vmEnd = info1.vmAddr + info1.vmSize;
+ uint64_t seg1FileEnd = info1.fileOffset + info1.fileSize;
+ forEachSegment(^(const SegmentInfo& info2, bool& stop2) {
+ if ( info1.segIndex == info2.segIndex )
+ return;
+ uint64_t seg2vmEnd = info2.vmAddr + info2.vmSize;
+ uint64_t seg2FileEnd = info2.fileOffset + info2.fileSize;
+ if ( ((info2.vmAddr <= info1.vmAddr) && (seg2vmEnd > info1.vmAddr) && (seg1vmEnd > info1.vmAddr )) || ((info2.vmAddr >= info1.vmAddr ) && (info2.vmAddr < seg1vmEnd) && (seg2vmEnd > info2.vmAddr)) ) {
+ diag.error("in '%s' segment %s vm range overlaps segment %s", path, info1.segName, info2.segName);
+ badSegments = true;
+ stop1 = true;
+ stop2 = true;
+ }
+ if ( ((info2.fileOffset <= info1.fileOffset) && (seg2FileEnd > info1.fileOffset) && (seg1FileEnd > info1.fileOffset)) || ((info2.fileOffset >= info1.fileOffset) && (info2.fileOffset < seg1FileEnd) && (seg2FileEnd > info2.fileOffset )) ) {
+ if ( !inDyldCache() ) {
+ // HACK: Split shared caches might put the __TEXT in a SubCache, then the __DATA in a later SubCache.
+ // The file offsets are in to each SubCache file, which means that they might overlap
+ // For now we have no choice but to disable this error
+ diag.error("in '%s' segment %s file content overlaps segment %s", path, info1.segName, info2.segName);
+ badSegments = true;
+ stop1 = true;
+ stop2 = true;
+ }
+ }
+ if ( (info1.segIndex < info2.segIndex) && !stop1 ) {
+ if ( (info1.vmAddr > info2.vmAddr) || ((info1.fileOffset > info2.fileOffset ) && (info1.fileOffset != 0) && (info2.fileOffset != 0)) ){
+ if ( !inDyldCache() && enforceFormat(Malformed::segmentOrder) && !isStaticExecutable() ) {
+ // <rdar://80084852> whitelist go libraries __DWARF segments
+ if ( (strcmp(info1.segName, "__DWARF") != 0 && strcmp(info2.segName, "__DWARF") != 0) ) {
+ // dyld cache __DATA_* segments are moved around
+ // The static kernel also has segments with vmAddr's before __TEXT
+ diag.error("in '%s' segment load commands out of order with respect to layout for %s and %s", path, info1.segName, info2.segName);
+ badSegments = true;
+ stop1 = true;
+ stop2 = true;
+ }
+ }
+ }
+ }
+ });
+ });
+ if ( badSegments )
+ return false;
+
+ // check sections are within segment
+ __block bool badSections = false;
+ forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
+ if ( cmd->cmd == LC_SEGMENT_64 ) {
+ const segment_command_64* seg = (segment_command_64*)cmd;
+ const section_64* const sectionsStart = (section_64*)((char*)seg + sizeof(struct segment_command_64));
+ const section_64* const sectionsEnd = §ionsStart[seg->nsects];
+ for (const section_64* sect=sectionsStart; (sect < sectionsEnd); ++sect) {
+ if ( (int64_t)(sect->size) < 0 ) {
+ diag.error("in '%s' section '%s' size too large 0x%llX", path, sect->sectname, sect->size);
+ badSections = true;
+ }
+ else if ( sect->addr < seg->vmaddr ) {
+ diag.error("in '%s' section '%s' start address 0x%llX is before containing segment's address 0x%0llX", path, sect->sectname, sect->addr, seg->vmaddr);
+ badSections = true;
+ }
+ else if ( sect->addr+sect->size > seg->vmaddr+seg->vmsize ) {
+ bool ignoreError = !enforceFormat(Malformed::sectionsAddrRangeWithinSegment);
+#if BUILDING_APP_CACHE_UTIL
+ if ( (seg->vmsize == 0) && !strcmp(seg->segname, "__CTF") )
+ ignoreError = true;
+#endif
+ if ( !ignoreError ) {
+ diag.error("in '%s' section '%s' end address 0x%llX is beyond containing segment's end address 0x%0llX", path, sect->sectname, sect->addr+sect->size, seg->vmaddr+seg->vmsize);
+ badSections = true;
+ }
+ }
+ }
+ }
+ else if ( cmd->cmd == LC_SEGMENT ) {
+ const segment_command* seg = (segment_command*)cmd;
+ const section* const sectionsStart = (section*)((char*)seg + sizeof(struct segment_command));
+ const section* const sectionsEnd = §ionsStart[seg->nsects];
+ for (const section* sect=sectionsStart; !stop && (sect < sectionsEnd); ++sect) {
+ if ( (int64_t)(sect->size) < 0 ) {
+ diag.error("in '%s' section %s size too large 0x%X", path, sect->sectname, sect->size);
+ badSections = true;
+ }
+ else if ( sect->addr < seg->vmaddr ) {
+ diag.error("in '%s' section %s start address 0x%X is before containing segment's address 0x%0X", path, sect->sectname, sect->addr, seg->vmaddr);
+ badSections = true;
+ }
+ else if ( sect->addr+sect->size > seg->vmaddr+seg->vmsize ) {
+ diag.error("in '%s' section %s end address 0x%X is beyond containing segment's end address 0x%0X", path, sect->sectname, sect->addr+sect->size, seg->vmaddr+seg->vmsize);
+ badSections = true;
+ }
+ }
+ }
+ });
+
+ return !badSections;
+}
+
+void MachOFile::forEachSingletonPatch(Diagnostics& diag, void (^handler)(SingletonPatchKind kind,
+ uint64_t runtimeOffset)) const
+{
+ uint32_t ptrSize = this->pointerSize();
+ uint32_t elementSize = (2 * ptrSize);
+ uint64_t loadAddress = this->preferredLoadAddress();
+ this->forEachSection(^(const SectionInfo §Info, bool malformedSectionRange, bool &stop) {
+ if ( strcmp(sectInfo.sectName, "__const_cfobj2") != 0 )
+ return;
+ stop = true;
+
+ if ( (sectInfo.sectSize % elementSize) != 0 ) {
+ diag.error("Incorrect patching size (%lld). Should be a multiple of (2 * ptrSize)", sectInfo.sectSize);
+ return;
+ }
+
+ if ( sectInfo.reserved2 != elementSize ) {
+ // ld64 must have rejected one or more of the elements in the section, so
+ // didn't set the reserved2 to let us patch
+ diag.error("reserved2 is unsupported value %d. Expected %d",
+ sectInfo.reserved2, elementSize);
+ return;
+ }
+
+ for ( uint64_t offset = 0; offset != sectInfo.sectSize; offset += elementSize ) {
+ uint64_t targetRuntimeOffset = (sectInfo.sectAddr + offset) - loadAddress;
+ handler(SingletonPatchKind::cfObj2, targetRuntimeOffset);
+ }
+ });
+}
+
+
+} // namespace dyld3
+