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--- dyld/dyld-1340/common/MachOLoaded.cpp
+++ /dev/null
@@ -1,949 +0,0 @@
-/*
- * 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 <TargetConditionals.h>
-#include "Defines.h"
-#if !TARGET_OS_EXCLAVEKIT
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/errno.h>
-#include <sys/mman.h>
-#include <mach/mach.h>
-#include <fcntl.h>
-#include <unistd.h>
-#endif
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <assert.h>
-#include <mach-o/nlist.h>
-
-#if !TARGET_OS_EXCLAVEKIT
-extern "C" {
- #include <corecrypto/ccdigest.h>
- #include <corecrypto/ccsha1.h>
- #include <corecrypto/ccsha2.h>
-}
-#endif
-
-#include "Header.h"
-#include "MachOFile.h"
-#include "MachOLoaded.h"
-#include "CodeSigningTypes.h"
-
-
-using mach_o::Header;
-
-namespace dyld3 {
-
-
-void MachOLoaded::getLinkEditLoadCommands(Diagnostics& diag, LinkEditInfo& result) const
-{
- result.dyldInfo = nullptr;
- result.exportsTrie = nullptr;
- result.chainedFixups = nullptr;
- result.symTab = nullptr;
- result.dynSymTab = nullptr;
- result.splitSegInfo = nullptr;
- result.functionStarts = nullptr;
- result.dataInCode = nullptr;
- result.codeSig = nullptr;
- __block bool hasUUID = false;
- __block bool hasMinVersion = false;
- __block bool hasEncrypt = false;
- forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
- switch ( cmd->cmd ) {
- case LC_DYLD_INFO:
- case LC_DYLD_INFO_ONLY:
- if ( cmd->cmdsize != sizeof(dyld_info_command) )
- diag.error("LC_DYLD_INFO load command size wrong");
- else if ( result.dyldInfo != nullptr )
- diag.error("multiple LC_DYLD_INFO load commands");
- result.dyldInfo = (dyld_info_command*)cmd;
- break;
- case LC_DYLD_EXPORTS_TRIE:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- diag.error("LC_DYLD_EXPORTS_TRIE load command size wrong");
- else if ( result.exportsTrie != nullptr )
- diag.error("multiple LC_DYLD_EXPORTS_TRIE load commands");
- result.exportsTrie = (linkedit_data_command*)cmd;
- break;
- case LC_DYLD_CHAINED_FIXUPS:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- diag.error("LC_DYLD_CHAINED_FIXUPS load command size wrong");
- else if ( result.chainedFixups != nullptr )
- diag.error("multiple LC_DYLD_CHAINED_FIXUPS load commands");
- result.chainedFixups = (linkedit_data_command*)cmd;
- break;
- case LC_SYMTAB:
- if ( cmd->cmdsize != sizeof(symtab_command) )
- diag.error("LC_SYMTAB load command size wrong");
- else if ( result.symTab != nullptr )
- diag.error("multiple LC_SYMTAB load commands");
- result.symTab = (symtab_command*)cmd;
- break;
- case LC_DYSYMTAB:
- if ( cmd->cmdsize != sizeof(dysymtab_command) )
- diag.error("LC_DYSYMTAB load command size wrong");
- else if ( result.dynSymTab != nullptr )
- diag.error("multiple LC_DYSYMTAB load commands");
- result.dynSymTab = (dysymtab_command*)cmd;
- break;
- case LC_SEGMENT_SPLIT_INFO:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- diag.error("LC_SEGMENT_SPLIT_INFO load command size wrong");
- else if ( result.splitSegInfo != nullptr )
- diag.error("multiple LC_SEGMENT_SPLIT_INFO load commands");
- result.splitSegInfo = (linkedit_data_command*)cmd;
- break;
- case LC_FUNCTION_STARTS:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- diag.error("LC_FUNCTION_STARTS load command size wrong");
- else if ( result.functionStarts != nullptr )
- diag.error("multiple LC_FUNCTION_STARTS load commands");
- result.functionStarts = (linkedit_data_command*)cmd;
- break;
- case LC_DATA_IN_CODE:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- diag.error("LC_DATA_IN_CODE load command size wrong");
- else if ( result.dataInCode != nullptr )
- diag.error("multiple LC_DATA_IN_CODE load commands");
- result.dataInCode = (linkedit_data_command*)cmd;
- break;
- case LC_CODE_SIGNATURE:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- diag.error("LC_CODE_SIGNATURE load command size wrong");
- else if ( result.codeSig != nullptr )
- diag.error("multiple LC_CODE_SIGNATURE load commands");
- result.codeSig = (linkedit_data_command*)cmd;
- break;
- case LC_UUID:
- if ( cmd->cmdsize != sizeof(uuid_command) )
- diag.error("LC_UUID load command size wrong");
- else if ( hasUUID )
- diag.error("multiple LC_UUID load commands");
- hasUUID = true;
- break;
- case LC_VERSION_MIN_IPHONEOS:
- case LC_VERSION_MIN_MACOSX:
- case LC_VERSION_MIN_TVOS:
- case LC_VERSION_MIN_WATCHOS:
- if ( cmd->cmdsize != sizeof(version_min_command) )
- diag.error("LC_VERSION_* load command size wrong");
- else if ( hasMinVersion )
- diag.error("multiple LC_VERSION_MIN_* load commands");
- hasMinVersion = true;
- break;
- case LC_BUILD_VERSION:
- if ( cmd->cmdsize != (sizeof(build_version_command) + ((build_version_command*)cmd)->ntools * sizeof(build_tool_version)) )
- diag.error("LC_BUILD_VERSION load command size wrong");
- break;
- case LC_ENCRYPTION_INFO:
- if ( cmd->cmdsize != sizeof(encryption_info_command) )
- diag.error("LC_ENCRYPTION_INFO load command size wrong");
- else if ( hasEncrypt )
- diag.error("multiple LC_ENCRYPTION_INFO load commands");
- else if ( is64() )
- diag.error("LC_ENCRYPTION_INFO found in 64-bit mach-o");
- hasEncrypt = true;
- break;
- case LC_ENCRYPTION_INFO_64:
- if ( cmd->cmdsize != sizeof(encryption_info_command_64) )
- diag.error("LC_ENCRYPTION_INFO_64 load command size wrong");
- else if ( hasEncrypt )
- diag.error("multiple LC_ENCRYPTION_INFO_64 load commands");
- else if ( !is64() )
- diag.error("LC_ENCRYPTION_INFO_64 found in 32-bit mach-o");
- hasEncrypt = true;
- break;
- }
- });
- if ( diag.noError() && (result.dynSymTab != nullptr) && (result.symTab == nullptr) )
- diag.error("LC_DYSYMTAB but no LC_SYMTAB load command");
-}
-
-void MachOLoaded::getLinkEditPointers(Diagnostics& diag, LinkEditInfo& result) const
-{
- getLinkEditLoadCommands(diag, result);
- if ( diag.noError() )
- getLayoutInfo(result.layout);
-}
-
-const uint8_t* MachOLoaded::getExportsTrie(const LinkEditInfo& leInfo, uint64_t& trieSize) const
-{
- if ( leInfo.exportsTrie != nullptr) {
- trieSize = leInfo.exportsTrie->datasize;
- uint64_t offsetInLinkEdit = leInfo.exportsTrie->dataoff - leInfo.layout.linkeditFileOffset;
- return (uint8_t*)this + (leInfo.layout.linkeditUnslidVMAddr - leInfo.layout.textUnslidVMAddr) + offsetInLinkEdit;
- }
- else if ( leInfo.dyldInfo != nullptr ) {
- trieSize = leInfo.dyldInfo->export_size;
- uint64_t offsetInLinkEdit = leInfo.dyldInfo->export_off - leInfo.layout.linkeditFileOffset;
- return (uint8_t*)this + (leInfo.layout.linkeditUnslidVMAddr - leInfo.layout.textUnslidVMAddr) + offsetInLinkEdit;
- }
- trieSize = 0;
- return nullptr;
-}
-
-
-void MachOLoaded::getLayoutInfo(LayoutInfo& result) const
-{
- ((const Header*)this)->forEachSegment(^(const Header::SegmentInfo& info, bool& stop) {
- if ( info.segmentName == "__TEXT" ) {
- result.textUnslidVMAddr = (uintptr_t)info.vmaddr;
- result.slide = (uintptr_t)(((uint64_t)this) - info.vmaddr);
- }
- else if ( info.segmentName == "__LINKEDIT" ) {
- result.linkeditUnslidVMAddr = (uintptr_t)info.vmaddr;
- result.linkeditFileOffset = (uint32_t)info.fileOffset;
- result.linkeditFileSize = (uint32_t)info.fileSize;
- result.linkeditSegIndex = info.segmentIndex;
- }
- result.lastSegIndex = info.segmentIndex;
- });
-}
-
-
-//#if BUILDING_LIBDYLD
-// this is only used by dlsym() at runtime. All other binding is done when the closure is built.
-bool MachOLoaded::hasExportedSymbol(const char* symbolName, DependentToMachOLoaded finder, void** result,
- bool* resultPointsToInstructions) const
-{
- typedef void* (*ResolverFunc)(void);
- ResolverFunc resolver;
- Diagnostics diag;
- FoundSymbol foundInfo;
- if ( findExportedSymbol(diag, symbolName, false, foundInfo, finder) ) {
- switch ( foundInfo.kind ) {
- case FoundSymbol::Kind::headerOffset: {
- *result = (uint8_t*)foundInfo.foundInDylib + foundInfo.value;
- *resultPointsToInstructions = false;
- int64_t slide = foundInfo.foundInDylib->getSlide();
- foundInfo.foundInDylib->forEachSection(^(const Header::SectionInfo& sectInfo, bool& stop) {
- uint64_t sectStartAddr = sectInfo.address + slide;
- uint64_t sectEndAddr = sectStartAddr + sectInfo.size;
- if ( ((uint64_t)*result >= sectStartAddr) && ((uint64_t)*result < sectEndAddr) ) {
- *resultPointsToInstructions = (sectInfo.flags & S_ATTR_PURE_INSTRUCTIONS) || (sectInfo.flags & S_ATTR_SOME_INSTRUCTIONS);
- stop = true;
- }
- });
- break;
- }
- case FoundSymbol::Kind::absolute:
- *result = (void*)(long)foundInfo.value;
- *resultPointsToInstructions = false;
- break;
- case FoundSymbol::Kind::resolverOffset:
- // foundInfo.value contains "stub".
- // in dlsym() we want to call resolver function to get final function address
- resolver = (ResolverFunc)((uint8_t*)foundInfo.foundInDylib + foundInfo.resolverFuncOffset);
- *result = (*resolver)();
- // FIXME: Set this properly
- *resultPointsToInstructions = true;
- break;
- }
- return true;
- }
- return false;
-}
-//#endif // BUILDING_LIBDYLD
-
-bool MachOLoaded::findExportedSymbol(Diagnostics& diag, const char* symbolName, bool weakImport, FoundSymbol& foundInfo, DependentToMachOLoaded findDependent) const
-{
- LinkEditInfo leInfo;
- getLinkEditPointers(diag, leInfo);
- if ( diag.hasError() )
- return false;
- uint64_t trieSize;
- if ( const uint8_t* trieStart = getExportsTrie(leInfo, trieSize) ) {
- const uint8_t* trieEnd = trieStart + trieSize;
- const uint8_t* node = trieWalk(diag, trieStart, trieEnd, symbolName);
- if ( node == nullptr ) {
- // symbol not exported from this image. Seach any re-exported dylibs
- __block unsigned depIndex = 0;
- __block bool foundInReExportedDylib = false;
- forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
- if ( isReExport && findDependent ) {
- if ( const MachOLoaded* depMH = findDependent(this, depIndex) ) {
- if ( depMH->findExportedSymbol(diag, symbolName, weakImport, foundInfo, findDependent) ) {
- stop = true;
- foundInReExportedDylib = true;
- }
- }
- }
- ++depIndex;
- });
- return foundInReExportedDylib;
- }
- const uint8_t* p = node;
- const uint64_t flags = read_uleb128(diag, p, trieEnd);
- if ( flags & EXPORT_SYMBOL_FLAGS_REEXPORT ) {
- if ( !findDependent )
- return false;
- // re-export from another dylib, lookup there
- const uint64_t ordinal = read_uleb128(diag, p, trieEnd);
- const char* importedName = (char*)p;
- if ( importedName[0] == '\0' )
- importedName = symbolName;
- if ( (ordinal == 0) || (ordinal > dependentDylibCount()) ) {
- diag.error("re-export ordinal %lld out of range for %s", ordinal, symbolName);
- return false;
- }
- uint32_t depIndex = (uint32_t)(ordinal-1);
- if ( const MachOLoaded* depMH = findDependent(this, depIndex) ) {
- return depMH->findExportedSymbol(diag, importedName, weakImport, foundInfo, findDependent);
- }
- else if (weakImport) {
- return false;
- }
- else {
- diag.error("dependent dylib %lld not found for re-exported symbol %s", ordinal, symbolName);
- return false;
- }
- }
- foundInfo.kind = FoundSymbol::Kind::headerOffset;
- foundInfo.isThreadLocal = false;
- foundInfo.isWeakDef = false;
- foundInfo.foundInDylib = this;
- foundInfo.value = read_uleb128(diag, p, trieEnd);
- foundInfo.resolverFuncOffset = 0;
- foundInfo.foundSymbolName = symbolName;
- if ( diag.hasError() )
- return false;
- switch ( flags & EXPORT_SYMBOL_FLAGS_KIND_MASK ) {
- case EXPORT_SYMBOL_FLAGS_KIND_REGULAR:
- if ( flags & EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER ) {
- foundInfo.kind = FoundSymbol::Kind::headerOffset;
- foundInfo.resolverFuncOffset = (uint32_t)read_uleb128(diag, p, trieEnd);
- }
- else {
- foundInfo.kind = FoundSymbol::Kind::headerOffset;
- }
- if ( flags & EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION )
- foundInfo.isWeakDef = true;
- break;
- case EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL:
- foundInfo.isThreadLocal = true;
- break;
- case EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE:
- foundInfo.kind = FoundSymbol::Kind::absolute;
- break;
- default:
- diag.error("unsupported exported symbol kind. flags=%llu at node offset=0x%0lX", flags, (long)(node-trieStart));
- return false;
- }
- return true;
- }
- else {
- // this is an old binary (before macOS 10.6), scan the symbol table
- foundInfo.foundInDylib = nullptr;
- forEachGlobalSymbol(diag, ^(const char* aSymbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool& stop) {
- if ( strcmp(aSymbolName, symbolName) == 0 ) {
- foundInfo.kind = FoundSymbol::Kind::headerOffset;
- foundInfo.isThreadLocal = false;
- foundInfo.foundInDylib = this;
- foundInfo.value = n_value - leInfo.layout.textUnslidVMAddr;
- foundInfo.resolverFuncOffset = 0;
- foundInfo.foundSymbolName = symbolName;
- stop = true;
- }
- });
- if ( foundInfo.foundInDylib == nullptr ) {
- // symbol not exported from this image. Search any re-exported dylibs
- __block unsigned depIndex = 0;
- forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
- if ( isReExport && findDependent ) {
- if ( const MachOLoaded* depMH = findDependent(this, depIndex) ) {
- if ( depMH->findExportedSymbol(diag, symbolName, weakImport, foundInfo, findDependent) ) {
- stop = true;
- }
- }
- }
- ++depIndex;
- });
- }
- return (foundInfo.foundInDylib != nullptr);
- }
-}
-
-intptr_t MachOLoaded::getSlide() const
-{
- Diagnostics diag;
- __block intptr_t slide = 0;
- forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
- if ( cmd->cmd == LC_SEGMENT_64 ) {
- const segment_command_64* seg = (segment_command_64*)cmd;
- if ( strcmp(seg->segname, "__TEXT") == 0 ) {
- slide = (uintptr_t)(((uint64_t)this) - seg->vmaddr);
- stop = true;
- }
- }
- else if ( cmd->cmd == LC_SEGMENT ) {
- const segment_command* seg = (segment_command*)cmd;
- if ( strcmp(seg->segname, "__TEXT") == 0 ) {
- slide = (uintptr_t)(((uint64_t)this) - seg->vmaddr);
- stop = true;
- }
- }
- });
- diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
- return slide;
-}
-
-const uint8_t* MachOLoaded::getLinkEditContent(const LayoutInfo& info, uint32_t fileOffset) const
-{
- uint32_t offsetInLinkedit = fileOffset - info.linkeditFileOffset;
- uintptr_t linkeditStartAddr = info.linkeditUnslidVMAddr + info.slide;
- return (uint8_t*)(linkeditStartAddr + offsetInLinkedit);
-}
-
-
-void MachOLoaded::forEachGlobalSymbol(Diagnostics& diag, void (^callback)(const char* symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool& stop)) const
-{
- LinkEditInfo leInfo;
- getLinkEditPointers(diag, leInfo);
- if ( diag.hasError() )
- return;
-
- const bool is64Bit = is64();
- if ( leInfo.symTab != nullptr ) {
- uint32_t globalsStartIndex = 0;
- uint32_t globalsCount = leInfo.symTab->nsyms;
- if ( leInfo.dynSymTab != nullptr ) {
- globalsStartIndex = leInfo.dynSymTab->iextdefsym;
- globalsCount = leInfo.dynSymTab->nextdefsym;
- }
- uint32_t maxStringOffset = leInfo.symTab->strsize;
- const char* stringPool = (char*)getLinkEditContent(leInfo.layout, leInfo.symTab->stroff);
- const struct nlist* symbols = (struct nlist*) (getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
- const struct nlist_64* symbols64 = (struct nlist_64*)symbols;
- bool stop = false;
- for (uint32_t i=0; (i < globalsCount) && !stop; ++i) {
- if ( is64Bit ) {
- const struct nlist_64& sym = symbols64[globalsStartIndex+i];
- if ( sym.n_un.n_strx > maxStringOffset )
- continue;
- if ( (sym.n_type & N_EXT) && ((sym.n_type & N_TYPE) == N_SECT) && ((sym.n_type & N_STAB) == 0) )
- callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
- }
- else {
- const struct nlist& sym = symbols[globalsStartIndex+i];
- if ( sym.n_un.n_strx > maxStringOffset )
- continue;
- if ( (sym.n_type & N_EXT) && ((sym.n_type & N_TYPE) == N_SECT) && ((sym.n_type & N_STAB) == 0) )
- callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
- }
- }
- }
-}
-
-void MachOLoaded::forEachLocalSymbol(Diagnostics& diag, void (^callback)(const char* symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool& stop)) const
-{
- LinkEditInfo leInfo;
- getLinkEditPointers(diag, leInfo);
- if ( diag.hasError() )
- return;
-
- const bool is64Bit = is64();
- if ( leInfo.symTab != nullptr ) {
- uint32_t localsStartIndex = 0;
- uint32_t localsCount = leInfo.symTab->nsyms;
- if ( leInfo.dynSymTab != nullptr ) {
- localsStartIndex = leInfo.dynSymTab->ilocalsym;
- localsCount = leInfo.dynSymTab->nlocalsym;
- }
- uint32_t maxStringOffset = leInfo.symTab->strsize;
- const char* stringPool = (char*)getLinkEditContent(leInfo.layout, leInfo.symTab->stroff);
- const struct nlist* symbols = (struct nlist*) (getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
- const struct nlist_64* symbols64 = (struct nlist_64*)(getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
- bool stop = false;
- for (uint32_t i=0; (i < localsCount) && !stop; ++i) {
- if ( is64Bit ) {
- const struct nlist_64& sym = symbols64[localsStartIndex+i];
- if ( sym.n_un.n_strx > maxStringOffset )
- continue;
- if ( ((sym.n_type & N_EXT) == 0) && ((sym.n_type & N_TYPE) == N_SECT) && ((sym.n_type & N_STAB) == 0) )
- callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
- }
- else {
- const struct nlist& sym = symbols[localsStartIndex+i];
- if ( sym.n_un.n_strx > maxStringOffset )
- continue;
- if ( ((sym.n_type & N_EXT) == 0) && ((sym.n_type & N_TYPE) == N_SECT) && ((sym.n_type & N_STAB) == 0) )
- callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
- }
- }
- }
-}
-
-
-void MachOLoaded::forEachImportedSymbol(Diagnostics& diag, void (^callback)(const char* symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool& stop)) const
-{
- LinkEditInfo leInfo;
- getLinkEditPointers(diag, leInfo);
- if ( diag.hasError() )
- return;
-
- const bool is64Bit = is64();
- if ( leInfo.symTab != nullptr ) {
- uint32_t globalsStartIndex = 0;
- uint32_t globalsCount = leInfo.symTab->nsyms;
- if ( leInfo.dynSymTab != nullptr ) {
- globalsStartIndex = leInfo.dynSymTab->iundefsym;
- globalsCount = leInfo.dynSymTab->nundefsym;
- }
- uint32_t maxStringOffset = leInfo.symTab->strsize;
- const char* stringPool = (char*)getLinkEditContent(leInfo.layout, leInfo.symTab->stroff);
- const struct nlist* symbols = (struct nlist*) (getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
- const struct nlist_64* symbols64 = (struct nlist_64*)symbols;
- bool stop = false;
- for (uint32_t i=0; (i < globalsCount) && !stop; ++i) {
- if ( is64Bit ) {
- const struct nlist_64& sym = symbols64[globalsStartIndex+i];
- if ( sym.n_un.n_strx > maxStringOffset )
- continue;
- if ( (sym.n_type & N_TYPE) == N_UNDF )
- callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
- }
- else {
- const struct nlist& sym = symbols[globalsStartIndex+i];
- if ( sym.n_un.n_strx > maxStringOffset )
- continue;
- if ( (sym.n_type & N_TYPE) == N_UNDF )
- callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
- }
- }
- }
-}
-
-std::string_view MachOLoaded::segmentName(uint32_t targetSegIndex) const
-{
- __block std::string_view result;
- ((const Header*)this)->forEachSegment(^(const Header::SegmentInfo& info, bool& stop) {
- if ( targetSegIndex == info.segmentIndex ) {
- result = info.segmentName;
- stop = true;
- }
- });
- return result;
-}
-
-bool MachOLoaded::findClosestFunctionStart(uint64_t address, uint64_t* functionStartAddress) const
-{
- Diagnostics diag;
- LinkEditInfo leInfo;
- getLinkEditPointers(diag, leInfo);
- if ( diag.hasError() )
- return false;
- if ( leInfo.functionStarts == nullptr )
- return false;
-
- const uint8_t* starts = getLinkEditContent(leInfo.layout, leInfo.functionStarts->dataoff);
- const uint8_t* startsEnd = starts + leInfo.functionStarts->datasize;
-
- uint64_t lastAddr = (uint64_t)(long)this;
- uint64_t runningAddr = lastAddr;
- while (diag.noError()) {
- uint64_t value = read_uleb128(diag, starts, startsEnd);
- if ( value == 0 )
- break;
- lastAddr = runningAddr;
- runningAddr += value;
- //fprintf(stderr, " addr=0x%08llX\n", runningAddr);
- if ( runningAddr > address ) {
- *functionStartAddress = lastAddr;
- return true;
- }
- };
-
- return false;
-}
-
-void MachOLoaded::forEachFunctionStart(void (^callback)(uint64_t runtimeOffset)) const
-{
- Diagnostics diag;
- LinkEditInfo leInfo;
- getLinkEditPointers(diag, leInfo);
- if ( diag.hasError() )
- return;
- if ( leInfo.functionStarts == nullptr )
- return;
-
- const uint8_t* starts = getLinkEditContent(leInfo.layout, leInfo.functionStarts->dataoff);
- const uint8_t* startsEnd = starts + leInfo.functionStarts->datasize;
-
- uint64_t runtimeOffset = 0;
- while (diag.noError()) {
- uint64_t value = read_uleb128(diag, starts, startsEnd);
- if ( value == 0 )
- break;
- runtimeOffset += value;
- callback(runtimeOffset);
- };
-}
-
-bool MachOLoaded::findClosestSymbol(uint64_t address, const char** symbolName, uint64_t* symbolAddr) const
-{
- Diagnostics diag;
- LinkEditInfo leInfo;
- getLinkEditPointers(diag, leInfo);
- if ( diag.hasError() )
- return false;
- if ( (leInfo.symTab == nullptr) || (leInfo.dynSymTab == nullptr) )
- return false;
- uint64_t targetUnslidAddress = address - leInfo.layout.slide;
-
- // find section index the address is in to validate n_sect
- __block uint32_t sectionIndexForTargetAddress = 0;
- forEachSection(^(const Header::SectionInfo& sectInfo, bool& stop) {
- ++sectionIndexForTargetAddress;
- if ( (sectInfo.address <= targetUnslidAddress) && (targetUnslidAddress < sectInfo.address+sectInfo.size) ) {
- stop = true;
- }
- });
-
- uint32_t maxStringOffset = leInfo.symTab->strsize;
- const char* stringPool = (char*)getLinkEditContent(leInfo.layout, leInfo.symTab->stroff);
- const struct nlist* symbols = (struct nlist*) (getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
- if ( is64() ) {
- const struct nlist_64* symbols64 = (struct nlist_64*)symbols;
- const struct nlist_64* bestSymbol = nullptr;
- // first walk all global symbols
- const struct nlist_64* const globalsStart = &symbols64[leInfo.dynSymTab->iextdefsym];
- const struct nlist_64* const globalsEnd = &globalsStart[leInfo.dynSymTab->nextdefsym];
- for (const struct nlist_64* s = globalsStart; s < globalsEnd; ++s) {
- if ( (s->n_type & N_TYPE) == N_SECT ) {
- if ( bestSymbol == nullptr ) {
- if ( (s->n_value <= targetUnslidAddress) && (s->n_sect == sectionIndexForTargetAddress) )
- bestSymbol = s;
- }
- else if ( (s->n_value <= targetUnslidAddress) && (bestSymbol->n_value < s->n_value) && (s->n_sect == sectionIndexForTargetAddress) ) {
- bestSymbol = s;
- }
- }
- }
- // next walk all local symbols
- const struct nlist_64* const localsStart = &symbols64[leInfo.dynSymTab->ilocalsym];
- const struct nlist_64* const localsEnd = &localsStart[leInfo.dynSymTab->nlocalsym];
- for (const struct nlist_64* s = localsStart; s < localsEnd; ++s) {
- if ( ((s->n_type & N_TYPE) == N_SECT) && ((s->n_type & N_STAB) == 0) ) {
- if ( bestSymbol == nullptr ) {
- if ( (s->n_value <= targetUnslidAddress) && (s->n_sect == sectionIndexForTargetAddress) )
- bestSymbol = s;
- }
- else if ( (s->n_value <= targetUnslidAddress) && (bestSymbol->n_value < s->n_value) && (s->n_sect == sectionIndexForTargetAddress) ) {
- bestSymbol = s;
- }
- }
- }
- if ( bestSymbol != NULL ) {
- *symbolAddr = bestSymbol->n_value + leInfo.layout.slide;
- if ( bestSymbol->n_un.n_strx < maxStringOffset )
- *symbolName = &stringPool[bestSymbol->n_un.n_strx];
- return true;
- }
- }
- else {
- const struct nlist* bestSymbol = nullptr;
- // first walk all global symbols
- const struct nlist* const globalsStart = &symbols[leInfo.dynSymTab->iextdefsym];
- const struct nlist* const globalsEnd = &globalsStart[leInfo.dynSymTab->nextdefsym];
- for (const struct nlist* s = globalsStart; s < globalsEnd; ++s) {
- if ( (s->n_type & N_TYPE) == N_SECT ) {
- if ( bestSymbol == nullptr ) {
- if ( (s->n_value <= targetUnslidAddress) && (s->n_sect == sectionIndexForTargetAddress) )
- bestSymbol = s;
- }
- else if ( (s->n_value <= targetUnslidAddress) && (bestSymbol->n_value < s->n_value) && (s->n_sect == sectionIndexForTargetAddress) ) {
- bestSymbol = s;
- }
- }
- }
- // next walk all local symbols
- const struct nlist* const localsStart = &symbols[leInfo.dynSymTab->ilocalsym];
- const struct nlist* const localsEnd = &localsStart[leInfo.dynSymTab->nlocalsym];
- for (const struct nlist* s = localsStart; s < localsEnd; ++s) {
- if ( ((s->n_type & N_TYPE) == N_SECT) && ((s->n_type & N_STAB) == 0) ) {
- if ( bestSymbol == nullptr ) {
- if ( (s->n_value <= targetUnslidAddress) && (s->n_sect == sectionIndexForTargetAddress) )
- bestSymbol = s;
- }
- else if ( (s->n_value <= targetUnslidAddress) && (bestSymbol->n_value < s->n_value) && (s->n_sect == sectionIndexForTargetAddress) ) {
- bestSymbol = s;
- }
- }
- }
- if ( bestSymbol != nullptr ) {
- *symbolAddr = bestSymbol->n_value + leInfo.layout.slide;
- if ( bestSymbol->n_un.n_strx < maxStringOffset )
- *symbolName = &stringPool[bestSymbol->n_un.n_strx];
- return true;
- }
- }
-
- return false;
-}
-
-const void* MachOLoaded::findSectionContent(const char* segName, const char* sectName, uint64_t& size) const
-{
- __block const void* result = nullptr;
- forEachSection(^(const Header::SectionInfo& sectInfo, bool& stop) {
- if ( sectInfo.sectionName != sectName )
- return;
-
- if ( sectInfo.segmentName != segName )
- return;
-
- size = sectInfo.size;
- if ( this->isPreload() )
- result = (uint8_t*)this + sectInfo.fileOffset;
- else
- result = (void*)(sectInfo.address + getSlide());
- stop = true;
- });
- return result;
-}
-
-
-bool MachOLoaded::intersectsRange(uintptr_t start, uintptr_t length) const
-{
- __block bool result = false;
- uintptr_t slide = getSlide();
- ((const Header*)this)->forEachSegment(^(const Header::SegmentInfo& info, bool& stop) {
- if ( (info.vmaddr + info.vmsize + slide >= start) && (info.vmaddr + slide < start + length) )
- result = true;
- });
- return result;
-}
-
-//#if BUILDING_DYLD || BUILDING_LIBDYLD
-void MachOLoaded::fixupAllChainedFixups(Diagnostics& diag, const dyld_chained_starts_in_image* starts, uintptr_t slide,
- Array<const void*> bindTargets, void (^logFixup)(void* loc, void* newValue)) const
-{
- forEachFixupInAllChains(diag, starts, true, ^(ChainedFixupPointerOnDisk* fixupLoc, const dyld_chained_starts_in_segment* segInfo, bool& stop) {
- void* newValue;
- switch (segInfo->pointer_format) {
-#if __LP64__
- #if __has_feature(ptrauth_calls)
- case DYLD_CHAINED_PTR_ARM64E:
- case DYLD_CHAINED_PTR_ARM64E_KERNEL:
- case DYLD_CHAINED_PTR_ARM64E_USERLAND:
- case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
- if ( fixupLoc->arm64e.authRebase.auth ) {
- if ( fixupLoc->arm64e.authBind.bind ) {
- uint32_t bindOrdinal = (segInfo->pointer_format == DYLD_CHAINED_PTR_ARM64E_USERLAND24) ? fixupLoc->arm64e.authBind24.ordinal : fixupLoc->arm64e.authBind.ordinal;
- if ( bindOrdinal >= bindTargets.count() ) {
- diag.error("out of range bind ordinal %d (max %llu)", bindOrdinal, bindTargets.count());
- stop = true;
- break;
- }
- else {
- // authenticated bind
- newValue = (void*)(bindTargets[bindOrdinal]);
- if (newValue != 0) // Don't sign missing weak imports
- newValue = (void*)fixupLoc->arm64e.signPointer(fixupLoc, (uintptr_t)newValue);
- }
- }
- else {
- // authenticated rebase
- newValue = (void*)fixupLoc->arm64e.signPointer(fixupLoc, (uintptr_t)this + fixupLoc->arm64e.authRebase.target);
- }
- }
- else {
- if ( fixupLoc->arm64e.bind.bind ) {
- uint32_t bindOrdinal = (segInfo->pointer_format == DYLD_CHAINED_PTR_ARM64E_USERLAND24) ? fixupLoc->arm64e.bind24.ordinal : fixupLoc->arm64e.bind.ordinal;
- if ( bindOrdinal >= bindTargets.count() ) {
- diag.error("out of range bind ordinal %d (max %llu)", bindOrdinal, bindTargets.count());
- stop = true;
- break;
- }
- else {
- // plain bind
- newValue = (void*)((long)bindTargets[bindOrdinal] + fixupLoc->arm64e.signExtendedAddend());
- }
- }
- else {
- // plain rebase (old format target is vmaddr, new format target is offset)
- if ( segInfo->pointer_format == DYLD_CHAINED_PTR_ARM64E )
- newValue = (void*)(fixupLoc->arm64e.unpackTarget()+slide);
- else
- newValue = (void*)((uintptr_t)this + fixupLoc->arm64e.unpackTarget());
- }
- }
- if ( logFixup )
- logFixup(fixupLoc, newValue);
- fixupLoc->raw64 = (uintptr_t)newValue;
- break;
- #endif
- case DYLD_CHAINED_PTR_64:
- case DYLD_CHAINED_PTR_64_OFFSET:
- if ( fixupLoc->generic64.bind.bind ) {
- if ( fixupLoc->generic64.bind.ordinal >= bindTargets.count() ) {
- diag.error("out of range bind ordinal %d (max %llu)", fixupLoc->generic64.bind.ordinal, bindTargets.count());
- stop = true;
- break;
- }
- else {
- newValue = (void*)((long)bindTargets[fixupLoc->generic64.bind.ordinal] + fixupLoc->generic64.signExtendedAddend());
- }
- }
- else {
- // plain rebase (old format target is vmaddr, new format target is offset)
- if ( segInfo->pointer_format == DYLD_CHAINED_PTR_64 )
- newValue = (void*)(fixupLoc->generic64.unpackedTarget()+slide);
- else
- newValue = (void*)((uintptr_t)this + fixupLoc->generic64.unpackedTarget());
- }
- if ( logFixup )
- logFixup(fixupLoc, newValue);
- fixupLoc->raw64 = (uintptr_t)newValue;
- break;
-#else
- case DYLD_CHAINED_PTR_32:
- if ( fixupLoc->generic32.bind.bind ) {
- if ( fixupLoc->generic32.bind.ordinal >= bindTargets.count() ) {
- diag.error("out of range bind ordinal %d (max %llu)", fixupLoc->generic32.bind.ordinal, bindTargets.count());
- stop = true;
- break;
- }
- else {
- newValue = (void*)((long)bindTargets[fixupLoc->generic32.bind.ordinal] + fixupLoc->generic32.bind.addend);
- }
- }
- else {
- if ( fixupLoc->generic32.rebase.target > segInfo->max_valid_pointer ) {
- // handle non-pointers in chain
- uint32_t bias = (0x04000000 + segInfo->max_valid_pointer)/2;
- newValue = (void*)(fixupLoc->generic32.rebase.target - bias);
- }
- else {
- newValue = (void*)(fixupLoc->generic32.rebase.target + slide);
- }
- }
- if ( logFixup )
- logFixup(fixupLoc, newValue);
- fixupLoc->raw32 = (uint32_t)(uintptr_t)newValue;
- break;
-#endif // __LP64__
- default:
- diag.error("unsupported pointer chain format: 0x%04X", segInfo->pointer_format);
- stop = true;
- break;
- }
- });
-}
-//#endif
-
-void MachOLoaded::forEachFixupInSegmentChains(Diagnostics& diag, const dyld_chained_starts_in_segment* segInfo, bool notifyNonPointers,
- void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, const dyld_chained_starts_in_segment* segInfo, bool& stop)) const
-{
- auto adaptor = ^(ChainedFixupPointerOnDisk* fixupLocation, bool& stop) {
- handler(fixupLocation, segInfo, 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 = (uint8_t*)this + segInfo->segment_offset + (pageIndex * segInfo->page_size);
- ChainedFixupPointerOnDisk* chain = (ChainedFixupPointerOnDisk*)(pageContentStart+offsetInPage);
-
- stopped = walkChain(diag, chain, segInfo->pointer_format, notifyNonPointers, segInfo->max_valid_pointer, adaptor);
- ++overflowIndex;
- }
- }
- else {
- // one chain per page
- uint8_t* pageContentStart = (uint8_t*)this + segInfo->segment_offset + (pageIndex * segInfo->page_size);
- ChainedFixupPointerOnDisk* chain = (ChainedFixupPointerOnDisk*)(pageContentStart+offsetInPage);
-
- stopped = walkChain(diag, chain, segInfo->pointer_format, notifyNonPointers, segInfo->max_valid_pointer, adaptor);
- }
- }
-}
-
-void MachOLoaded::forEachFixupInAllChains(Diagnostics& diag, const dyld_chained_starts_in_image* starts, bool notifyNonPointers,
- void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, const dyld_chained_starts_in_segment* segInfo, bool& stop)) const
-{
- 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]);
- forEachFixupInSegmentChains(diag, segInfo, notifyNonPointers, handler);
- }
-}
-
-void MachOLoaded::forEachFixupInAllChains(Diagnostics& diag, uint16_t pointer_format, uint32_t starts_count, const uint32_t chain_starts[],
- void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, bool& stop)) const
-{
- auto adaptor = ^(ChainedFixupPointerOnDisk* fixupLocation, bool& stop) {
- handler(fixupLocation, stop);
- };
- for (uint32_t i=0; i < starts_count; ++i) {
- const uint32_t startVmOffset = chain_starts[i];
- __block ChainedFixupPointerOnDisk* chain = nullptr;
- if ( this->isPreload() ) {
- // starts are vm-offsets but image is not loaded with zerofill, so need to map vm-offsets to file-offsets
- __block uint64_t startVmAddr = ~0ULL;
- ((const Header*)this)->forEachSegment(^(const Header::SegmentInfo& info, bool& stop) {
- if ( startVmAddr == ~0ULL )
- startVmAddr = info.vmaddr + startVmOffset;
- if ( (info.vmaddr <= startVmAddr) && (startVmAddr < (info.vmaddr + info.vmsize)) ) {
- uint64_t startFileOffset = info.fileOffset + startVmAddr - info.vmaddr;
- chain = (ChainedFixupPointerOnDisk*)((uint8_t*)this + startFileOffset);
- stop = true;
- }
- });
- }
- else {
- chain = (ChainedFixupPointerOnDisk*)((uint8_t*)this + startVmOffset);
- }
- if ( walkChain(diag, chain, pointer_format, false, 0, adaptor) )
- break;
- }
-}
-
-uint64_t MachOLoaded::firstSegmentFileOffset() const
-{
- __block uint64_t result = 0;
- ((const Header*)this)->forEachSegment(^(const Header::SegmentInfo& info, bool& stop) {
- result = info.fileOffset;
- stop = true;
- });
- return result;
-}
-
-
-
-
-} // namespace dyld3
-