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MachOFile.cpp
4095 lines (3743 loc) · 162 KB
/
MachOFile.cpp
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/*
* 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;
}