-/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
- *
- * Copyright (c) 2006-2007 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 <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <unistd.h>
-
-#include <vector>
-#include <set>
-#include <ext/hash_set>
-
-#include "MachOFileAbstraction.hpp"
-#include "Architectures.hpp"
-
-
- __attribute__((noreturn))
-void throwf(const char* format, ...)
-{
- va_list list;
- char* p;
- va_start(list, format);
- vasprintf(&p, format, list);
- va_end(list);
-
- const char* t = p;
- throw t;
-}
-
-
-template <typename A>
-class MachOChecker
-{
-public:
- static bool validFile(const uint8_t* fileContent);
- static MachOChecker<A>* make(const uint8_t* fileContent, uint32_t fileLength, const char* path)
- { return new MachOChecker<A>(fileContent, fileLength, path); }
- virtual ~MachOChecker() {}
-
-
-private:
- typedef typename A::P P;
- typedef typename A::P::E E;
- typedef typename A::P::uint_t pint_t;
-
- class CStringEquals
- {
- public:
- bool operator()(const char* left, const char* right) const { return (strcmp(left, right) == 0); }
- };
-
- typedef __gnu_cxx::hash_set<const char*, __gnu_cxx::hash<const char*>, CStringEquals> StringSet;
-
- MachOChecker(const uint8_t* fileContent, uint32_t fileLength, const char* path);
- void checkMachHeader();
- void checkLoadCommands();
- void checkSection(const macho_segment_command<P>* segCmd, const macho_section<P>* sect);
- uint8_t loadCommandSizeMask();
- void checkSymbolTable();
- void checkIndirectSymbolTable();
- void checkRelocations();
- void checkExternalReloation(const macho_relocation_info<P>* reloc);
- void checkLocalReloation(const macho_relocation_info<P>* reloc);
- pint_t relocBase();
- bool addressInWritableSegment(pint_t address);
-
- const char* fPath;
- const macho_header<P>* fHeader;
- uint32_t fLength;
- const char* fStrings;
- const char* fStringsEnd;
- const macho_nlist<P>* fSymbols;
- uint32_t fSymbolCount;
- const macho_dysymtab_command<P>* fDynamicSymbolTable;
- const uint32_t* fIndirectTable;
- uint32_t fIndirectTableCount;
- const macho_relocation_info<P>* fLocalRelocations;
- uint32_t fLocalRelocationsCount;
- const macho_relocation_info<P>* fExternalRelocations;
- uint32_t fExternalRelocationsCount;
- bool fWriteableSegmentWithAddrOver4G;
- const macho_segment_command<P>* fFirstSegment;
- const macho_segment_command<P>* fFirstWritableSegment;
-};
-
-
-
-template <>
-bool MachOChecker<ppc>::validFile(const uint8_t* fileContent)
-{
- const macho_header<P>* header = (const macho_header<P>*)fileContent;
- if ( header->magic() != MH_MAGIC )
- return false;
- if ( header->cputype() != CPU_TYPE_POWERPC )
- return false;
- switch (header->filetype()) {
- case MH_EXECUTE:
- case MH_DYLIB:
- case MH_BUNDLE:
- case MH_DYLINKER:
- return true;
- }
- return false;
-}
-
-template <>
-bool MachOChecker<ppc64>::validFile(const uint8_t* fileContent)
-{
- const macho_header<P>* header = (const macho_header<P>*)fileContent;
- if ( header->magic() != MH_MAGIC_64 )
- return false;
- if ( header->cputype() != CPU_TYPE_POWERPC64 )
- return false;
- switch (header->filetype()) {
- case MH_EXECUTE:
- case MH_DYLIB:
- case MH_BUNDLE:
- case MH_DYLINKER:
- return true;
- }
- return false;
-}
-
-template <>
-bool MachOChecker<x86>::validFile(const uint8_t* fileContent)
-{
- const macho_header<P>* header = (const macho_header<P>*)fileContent;
- if ( header->magic() != MH_MAGIC )
- return false;
- if ( header->cputype() != CPU_TYPE_I386 )
- return false;
- switch (header->filetype()) {
- case MH_EXECUTE:
- case MH_DYLIB:
- case MH_BUNDLE:
- case MH_DYLINKER:
- return true;
- }
- return false;
-}
-
-template <>
-bool MachOChecker<x86_64>::validFile(const uint8_t* fileContent)
-{
- const macho_header<P>* header = (const macho_header<P>*)fileContent;
- if ( header->magic() != MH_MAGIC_64 )
- return false;
- if ( header->cputype() != CPU_TYPE_X86_64 )
- return false;
- switch (header->filetype()) {
- case MH_EXECUTE:
- case MH_DYLIB:
- case MH_BUNDLE:
- case MH_DYLINKER:
- return true;
- }
- return false;
-}
-
-template <>
-bool MachOChecker<arm>::validFile(const uint8_t* fileContent)
-{
- const macho_header<P>* header = (const macho_header<P>*)fileContent;
- if ( header->magic() != MH_MAGIC )
- return false;
- if ( header->cputype() != CPU_TYPE_ARM )
- return false;
- switch (header->filetype()) {
- case MH_EXECUTE:
- case MH_DYLIB:
- case MH_BUNDLE:
- case MH_DYLINKER:
- return true;
- }
- return false;
-}
-
-template <> uint8_t MachOChecker<ppc>::loadCommandSizeMask() { return 0x03; }
-template <> uint8_t MachOChecker<ppc64>::loadCommandSizeMask() { return 0x07; }
-template <> uint8_t MachOChecker<x86>::loadCommandSizeMask() { return 0x03; }
-template <> uint8_t MachOChecker<x86_64>::loadCommandSizeMask() { return 0x07; }
-template <> uint8_t MachOChecker<arm>::loadCommandSizeMask() { return 0x03; }
-
-template <typename A>
-MachOChecker<A>::MachOChecker(const uint8_t* fileContent, uint32_t fileLength, const char* path)
- : fHeader(NULL), fLength(fileLength), fStrings(NULL), fSymbols(NULL), fSymbolCount(0), fDynamicSymbolTable(NULL), fIndirectTableCount(0),
- fLocalRelocations(NULL), fLocalRelocationsCount(0), fExternalRelocations(NULL), fExternalRelocationsCount(0),
- fWriteableSegmentWithAddrOver4G(false), fFirstSegment(NULL), fFirstWritableSegment(NULL)
-{
- // sanity check
- if ( ! validFile(fileContent) )
- throw "not a mach-o file that can be checked";
-
- fPath = strdup(path);
- fHeader = (const macho_header<P>*)fileContent;
-
- // sanity check header
- checkMachHeader();
-
- // check load commands
- checkLoadCommands();
-
- checkIndirectSymbolTable();
-
- checkRelocations();
-
- checkSymbolTable();
-}
-
-
-template <typename A>
-void MachOChecker<A>::checkMachHeader()
-{
- if ( (fHeader->sizeofcmds() + sizeof(macho_header<P>)) > fLength )
- throw "sizeofcmds in mach_header is larger than file";
-
- uint32_t flags = fHeader->flags();
- const uint32_t invalidBits = MH_INCRLINK | MH_LAZY_INIT | 0xFFC00000;
- if ( flags & invalidBits )
- throw "invalid bits in mach_header flags";
- if ( (flags & MH_NO_REEXPORTED_DYLIBS) && (fHeader->filetype() != MH_DYLIB) )
- throw "MH_NO_REEXPORTED_DYLIBS bit of mach_header flags only valid for dylibs";
-}
-
-template <typename A>
-void MachOChecker<A>::checkLoadCommands()
-{
- // check that all load commands fit within the load command space file
- const macho_encryption_info_command<P>* encryption_info = NULL;
- const uint8_t* const endOfFile = (uint8_t*)fHeader + fLength;
- const uint8_t* const endOfLoadCommands = (uint8_t*)fHeader + sizeof(macho_header<P>) + fHeader->sizeofcmds();
- const uint32_t cmd_count = fHeader->ncmds();
- const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)fHeader + sizeof(macho_header<P>));
- const macho_load_command<P>* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- uint32_t size = cmd->cmdsize();
- if ( (size & this->loadCommandSizeMask()) != 0 )
- throwf("load command #%d has a unaligned size", i);
- const uint8_t* endOfCmd = ((uint8_t*)cmd)+cmd->cmdsize();
- if ( endOfCmd > endOfLoadCommands )
- throwf("load command #%d extends beyond the end of the load commands", i);
- if ( endOfCmd > endOfFile )
- throwf("load command #%d extends beyond the end of the file", i);
- switch ( cmd->cmd() ) {
- case macho_segment_command<P>::CMD:
- case LC_SYMTAB:
- case LC_UNIXTHREAD:
- case LC_DYSYMTAB:
- case LC_LOAD_DYLIB:
- case LC_ID_DYLIB:
- case LC_LOAD_DYLINKER:
- case LC_ID_DYLINKER:
- case macho_routines_command<P>::CMD:
- case LC_SUB_FRAMEWORK:
- case LC_SUB_CLIENT:
- case LC_TWOLEVEL_HINTS:
- case LC_PREBIND_CKSUM:
- case LC_LOAD_WEAK_DYLIB:
- case LC_LAZY_LOAD_DYLIB:
- case LC_UUID:
- case LC_REEXPORT_DYLIB:
- case LC_SEGMENT_SPLIT_INFO:
- case LC_CODE_SIGNATURE:
- break;
- case LC_ENCRYPTION_INFO:
- encryption_info = (macho_encryption_info_command<P>*)cmd;
- break;
- case LC_SUB_UMBRELLA:
- case LC_SUB_LIBRARY:
- if ( fHeader->flags() & MH_NO_REEXPORTED_DYLIBS )
- throw "MH_NO_REEXPORTED_DYLIBS bit of mach_header flags should not be set in an image with LC_SUB_LIBRARY or LC_SUB_UMBRELLA";
- break;
- default:
- throwf("load command #%d is an unknown kind 0x%X", i, cmd->cmd());
- }
- cmd = (const macho_load_command<P>*)endOfCmd;
- }
-
- // check segments
- cmd = cmds;
- std::vector<std::pair<pint_t, pint_t> > segmentAddressRanges;
- std::vector<std::pair<pint_t, pint_t> > segmentFileOffsetRanges;
- const macho_segment_command<P>* linkEditSegment = NULL;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
- const macho_segment_command<P>* segCmd = (const macho_segment_command<P>*)cmd;
- if ( segCmd->cmdsize() != (sizeof(macho_segment_command<P>) + segCmd->nsects() * sizeof(macho_section_content<P>)) )
- throw "invalid segment load command size";
-
- // see if this overlaps another segment address range
- uint64_t startAddr = segCmd->vmaddr();
- uint64_t endAddr = startAddr + segCmd->vmsize();
- for (typename std::vector<std::pair<pint_t, pint_t> >::iterator it = segmentAddressRanges.begin(); it != segmentAddressRanges.end(); ++it) {
- if ( it->first < startAddr ) {
- if ( it->second > startAddr )
- throw "overlapping segment vm addresses";
- }
- else if ( it->first > startAddr ) {
- if ( it->first < endAddr )
- throw "overlapping segment vm addresses";
- }
- else {
- throw "overlapping segment vm addresses";
- }
- segmentAddressRanges.push_back(std::make_pair<pint_t, pint_t>(startAddr, endAddr));
- }
- // see if this overlaps another segment file offset range
- uint64_t startOffset = segCmd->fileoff();
- uint64_t endOffset = startOffset + segCmd->filesize();
- for (typename std::vector<std::pair<pint_t, pint_t> >::iterator it = segmentFileOffsetRanges.begin(); it != segmentFileOffsetRanges.end(); ++it) {
- if ( it->first < startOffset ) {
- if ( it->second > startOffset )
- throw "overlapping segment file data";
- }
- else if ( it->first > startOffset ) {
- if ( it->first < endOffset )
- throw "overlapping segment file data";
- }
- else {
- throw "overlapping segment file data";
- }
- segmentFileOffsetRanges.push_back(std::make_pair<pint_t, pint_t>(startOffset, endOffset));
- // check is within file bounds
- if ( (startOffset > fLength) || (endOffset > fLength) )
- throw "segment file data is past end of file";
- }
- // verify it fits in file
- if ( startOffset > fLength )
- throw "segment fileoff does not fit in file";
- if ( endOffset > fLength )
- throw "segment fileoff+filesize does not fit in file";
-
- // keep LINKEDIT segment
- if ( strcmp(segCmd->segname(), "__LINKEDIT") == 0 )
- linkEditSegment = segCmd;
-
- // cache interesting segments
- if ( fFirstSegment == NULL )
- fFirstSegment = segCmd;
- if ( (segCmd->initprot() & VM_PROT_WRITE) != 0 ) {
- if ( fFirstWritableSegment == NULL )
- fFirstWritableSegment = segCmd;
- if ( segCmd->vmaddr() > 0x100000000ULL )
- fWriteableSegmentWithAddrOver4G = true;
- }
-
- // check section ranges
- const macho_section<P>* const sectionsStart = (macho_section<P>*)((char*)segCmd + sizeof(macho_segment_command<P>));
- const macho_section<P>* const sectionsEnd = §ionsStart[segCmd->nsects()];
- for(const macho_section<P>* sect = sectionsStart; sect < sectionsEnd; ++sect) {
- // check all sections are within segment
- if ( sect->addr() < startAddr )
- throwf("section %s vm address not within segment", sect->sectname());
- if ( (sect->addr()+sect->size()) > endAddr )
- throwf("section %s vm address not within segment", sect->sectname());
- if ( ((sect->flags() & SECTION_TYPE) != S_ZEROFILL) && (segCmd->filesize() != 0) ) {
- if ( sect->offset() < startOffset )
- throwf("section %s file offset not within segment", sect->sectname());
- if ( (sect->offset()+sect->size()) > endOffset )
- throwf("section %s file offset not within segment", sect->sectname());
- }
- checkSection(segCmd, sect);
- }
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
-
- // verify there was a LINKEDIT segment
- if ( linkEditSegment == NULL )
- throw "no __LINKEDIT segment";
-
- // checks for executables
- bool isStaticExecutable = false;
- if ( fHeader->filetype() == MH_EXECUTE ) {
- isStaticExecutable = true;
- cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch ( cmd->cmd() ) {
- case LC_LOAD_DYLINKER:
- // the existence of a dyld load command makes a executable dynamic
- isStaticExecutable = false;
- break;
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
- if ( isStaticExecutable ) {
- if ( fHeader->flags() != MH_NOUNDEFS )
- throw "invalid bits in mach_header flags for static executable";
- }
- }
-
- // verify encryption info
- if ( encryption_info != NULL ) {
- if ( fHeader->filetype() != MH_EXECUTE )
- throw "LC_ENCRYPTION_INFO load command is only legal in main executables";
- if ( encryption_info->cryptoff() < (sizeof(macho_header<P>) + fHeader->sizeofcmds()) )
- throw "LC_ENCRYPTION_INFO load command has cryptoff covers some load commands";
- if ( (encryption_info->cryptoff() % 4096) != 0 )
- throw "LC_ENCRYPTION_INFO load command has cryptoff which is not page aligned";
- if ( (encryption_info->cryptsize() % 4096) != 0 )
- throw "LC_ENCRYPTION_INFO load command has cryptsize which is not page sized";
- for (typename std::vector<std::pair<pint_t, pint_t> >::iterator it = segmentFileOffsetRanges.begin();
- it != segmentFileOffsetRanges.end(); ++it) {
- if ( (it->first <= encryption_info->cryptoff()) && (encryption_info->cryptoff() < it->second) ) {
- if ( (encryption_info->cryptoff() + encryption_info->cryptsize()) > it->second )
- throw "LC_ENCRYPTION_INFO load command is not contained within one segment";
- }
- }
- }
-
- // check LC_SYMTAB, LC_DYSYMTAB, and LC_SEGMENT_SPLIT_INFO
- cmd = cmds;
- bool foundDynamicSymTab = false;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch ( cmd->cmd() ) {
- case LC_SYMTAB:
- {
- const macho_symtab_command<P>* symtab = (macho_symtab_command<P>*)cmd;
- fSymbolCount = symtab->nsyms();
- fSymbols = (const macho_nlist<P>*)((char*)fHeader + symtab->symoff());
- if ( symtab->symoff() < linkEditSegment->fileoff() )
- throw "symbol table not in __LINKEDIT";
- if ( (symtab->symoff() + fSymbolCount*sizeof(macho_nlist<P>*)) > (linkEditSegment->fileoff()+linkEditSegment->filesize()) )
- throw "symbol table end not in __LINKEDIT";
- if ( (symtab->symoff() % sizeof(pint_t)) != 0 )
- throw "symbol table start not pointer aligned";
- fStrings = (char*)fHeader + symtab->stroff();
- fStringsEnd = fStrings + symtab->strsize();
- if ( symtab->stroff() < linkEditSegment->fileoff() )
- throw "string pool not in __LINKEDIT";
- if ( (symtab->stroff()+symtab->strsize()) > (linkEditSegment->fileoff()+linkEditSegment->filesize()) )
- throw "string pool extends beyond __LINKEDIT";
- if ( (symtab->stroff() % 4) != 0 ) // work around until rdar://problem/4737991 is fixed
- throw "string pool start not pointer aligned";
- if ( (symtab->strsize() % sizeof(pint_t)) != 0 )
- throw "string pool size not a multiple of pointer size";
- }
- break;
- case LC_DYSYMTAB:
- {
- if ( isStaticExecutable )
- throw "LC_DYSYMTAB should not be used in static executable";
- foundDynamicSymTab = true;
- fDynamicSymbolTable = (struct macho_dysymtab_command<P>*)cmd;
- fIndirectTable = (uint32_t*)((char*)fHeader + fDynamicSymbolTable->indirectsymoff());
- fIndirectTableCount = fDynamicSymbolTable->nindirectsyms();
- if ( fIndirectTableCount != 0 ) {
- if ( fDynamicSymbolTable->indirectsymoff() < linkEditSegment->fileoff() )
- throw "indirect symbol table not in __LINKEDIT";
- if ( (fDynamicSymbolTable->indirectsymoff()+fIndirectTableCount*8) > (linkEditSegment->fileoff()+linkEditSegment->filesize()) )
- throw "indirect symbol table not in __LINKEDIT";
- if ( (fDynamicSymbolTable->indirectsymoff() % sizeof(pint_t)) != 0 )
- throw "indirect symbol table not pointer aligned";
- }
- fLocalRelocationsCount = fDynamicSymbolTable->nlocrel();
- if ( fLocalRelocationsCount != 0 ) {
- fLocalRelocations = (const macho_relocation_info<P>*)((char*)fHeader + fDynamicSymbolTable->locreloff());
- if ( fDynamicSymbolTable->locreloff() < linkEditSegment->fileoff() )
- throw "local relocations not in __LINKEDIT";
- if ( (fDynamicSymbolTable->locreloff()+fLocalRelocationsCount*sizeof(macho_relocation_info<P>)) > (linkEditSegment->fileoff()+linkEditSegment->filesize()) )
- throw "local relocations not in __LINKEDIT";
- if ( (fDynamicSymbolTable->locreloff() % sizeof(pint_t)) != 0 )
- throw "local relocations table not pointer aligned";
- }
- fExternalRelocationsCount = fDynamicSymbolTable->nextrel();
- if ( fExternalRelocationsCount != 0 ) {
- fExternalRelocations = (const macho_relocation_info<P>*)((char*)fHeader + fDynamicSymbolTable->extreloff());
- if ( fDynamicSymbolTable->extreloff() < linkEditSegment->fileoff() )
- throw "external relocations not in __LINKEDIT";
- if ( (fDynamicSymbolTable->extreloff()+fExternalRelocationsCount*sizeof(macho_relocation_info<P>)) > (linkEditSegment->fileoff()+linkEditSegment->filesize()) )
- throw "external relocations not in __LINKEDIT";
- if ( (fDynamicSymbolTable->extreloff() % sizeof(pint_t)) != 0 )
- throw "external relocations table not pointer aligned";
- }
- }
- break;
- case LC_SEGMENT_SPLIT_INFO:
- {
- if ( isStaticExecutable )
- throw "LC_SEGMENT_SPLIT_INFO should not be used in static executable";
- const macho_linkedit_data_command<P>* info = (struct macho_linkedit_data_command<P>*)cmd;
- if ( info->dataoff() < linkEditSegment->fileoff() )
- throw "split seg info not in __LINKEDIT";
- if ( (info->dataoff()+info->datasize()) > (linkEditSegment->fileoff()+linkEditSegment->filesize()) )
- throw "split seg info not in __LINKEDIT";
- if ( (info->dataoff() % sizeof(pint_t)) != 0 )
- throw "split seg info table not pointer aligned";
- if ( (info->datasize() % sizeof(pint_t)) != 0 )
- throw "split seg info size not a multiple of pointer size";
- }
- break;
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
- if ( !isStaticExecutable && !foundDynamicSymTab )
- throw "missing dynamic symbol table";
- if ( fStrings == NULL )
- throw "missing symbol table";
-
-}
-
-template <typename A>
-void MachOChecker<A>::checkSection(const macho_segment_command<P>* segCmd, const macho_section<P>* sect)
-{
- uint8_t sectionType = (sect->flags() & SECTION_TYPE);
- if ( sectionType == S_ZEROFILL ) {
- if ( sect->offset() != 0 )
- throwf("section offset should be zero for zero-fill section %s", sect->sectname());
- }
-
- // more section tests here
-}
-
-template <typename A>
-void MachOChecker<A>::checkIndirectSymbolTable()
-{
- const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)fHeader + sizeof(macho_header<P>));
- const uint32_t cmd_count = fHeader->ncmds();
- const macho_load_command<P>* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
- const macho_segment_command<P>* segCmd = (const macho_segment_command<P>*)cmd;
- const macho_section<P>* const sectionsStart = (macho_section<P>*)((char*)segCmd + sizeof(macho_segment_command<P>));
- const macho_section<P>* const sectionsEnd = §ionsStart[segCmd->nsects()];
- for(const macho_section<P>* sect = sectionsStart; sect < sectionsEnd; ++sect) {
- // make sure all magic sections that use indirect symbol table fit within it
- uint32_t start = 0;
- uint32_t elementSize = 0;
- switch ( sect->flags() & SECTION_TYPE ) {
- case S_SYMBOL_STUBS:
- elementSize = sect->reserved2();
- start = sect->reserved1();
- break;
- case S_LAZY_SYMBOL_POINTERS:
- case S_NON_LAZY_SYMBOL_POINTERS:
- elementSize = sizeof(pint_t);
- start = sect->reserved1();
- break;
- }
- if ( elementSize != 0 ) {
- uint32_t count = sect->size() / elementSize;
- if ( (count*elementSize) != sect->size() )
- throwf("%s section size is not an even multiple of element size", sect->sectname());
- if ( (start+count) > fIndirectTableCount )
- throwf("%s section references beyond end of indirect symbol table (%d > %d)", sect->sectname(), start+count, fIndirectTableCount );
- }
- }
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
-}
-
-
-template <typename A>
-void MachOChecker<A>::checkSymbolTable()
-{
- // verify no duplicate external symbol names
- if ( fDynamicSymbolTable != NULL ) {
- StringSet externalNames;
- const macho_nlist<P>* const exportedStart = &fSymbols[fDynamicSymbolTable->iextdefsym()];
- const macho_nlist<P>* const exportedEnd = &exportedStart[fDynamicSymbolTable->nextdefsym()];
- for(const macho_nlist<P>* p = exportedStart; p < exportedEnd; ++p) {
- const char* symName = &fStrings[p->n_strx()];
- if ( externalNames.find(symName) != externalNames.end() )
- throwf("duplicate external symbol: %s", symName);
- externalNames.insert(symName);
- }
- }
-}
-
-
-template <>
-ppc::P::uint_t MachOChecker<ppc>::relocBase()
-{
- if ( fHeader->flags() & MH_SPLIT_SEGS )
- return fFirstWritableSegment->vmaddr();
- else
- return fFirstSegment->vmaddr();
-}
-
-template <>
-ppc64::P::uint_t MachOChecker<ppc64>::relocBase()
-{
- if ( fWriteableSegmentWithAddrOver4G )
- return fFirstWritableSegment->vmaddr();
- else
- return fFirstSegment->vmaddr();
-}
-
-template <>
-x86::P::uint_t MachOChecker<x86>::relocBase()
-{
- if ( fHeader->flags() & MH_SPLIT_SEGS )
- return fFirstWritableSegment->vmaddr();
- else
- return fFirstSegment->vmaddr();
-}
-
-template <>
-x86_64::P::uint_t MachOChecker<x86_64>::relocBase()
-{
- // check for split-seg
- return fFirstWritableSegment->vmaddr();
-}
-
-template <>
-arm::P::uint_t MachOChecker<arm>::relocBase()
-{
- if ( fHeader->flags() & MH_SPLIT_SEGS )
- return fFirstWritableSegment->vmaddr();
- else
- return fFirstSegment->vmaddr();
-}
-
-
-template <typename A>
-bool MachOChecker<A>::addressInWritableSegment(pint_t address)
-{
- const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)fHeader + sizeof(macho_header<P>));
- const uint32_t cmd_count = fHeader->ncmds();
- const macho_load_command<P>* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
- const macho_segment_command<P>* segCmd = (const macho_segment_command<P>*)cmd;
- if ( (address >= segCmd->vmaddr()) && (address < segCmd->vmaddr()+segCmd->vmsize()) ) {
- // if segment is writable, we are fine
- if ( (segCmd->initprot() & VM_PROT_WRITE) != 0 )
- return true;
- // could be a text reloc, make sure section bit is set
- const macho_section<P>* const sectionsStart = (macho_section<P>*)((char*)segCmd + sizeof(macho_segment_command<P>));
- const macho_section<P>* const sectionsEnd = §ionsStart[segCmd->nsects()];
- for(const macho_section<P>* sect = sectionsStart; sect < sectionsEnd; ++sect) {
- if ( (sect->addr() <= address) && (address < (sect->addr()+sect->size())) ) {
- // found section for this address, if has relocs we are fine
- return ( (sect->flags() & (S_ATTR_EXT_RELOC|S_ATTR_LOC_RELOC)) != 0 );
- }
- }
- }
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
- return false;
-}
-
-
-template <>
-void MachOChecker<ppc>::checkExternalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_length() != 2 )
- throw "bad external relocation length";
- if ( reloc->r_type() != GENERIC_RELOC_VANILLA )
- throw "unknown external relocation type";
- if ( reloc->r_pcrel() != 0 )
- throw "bad external relocation pc_rel";
- if ( reloc->r_extern() == 0 )
- throw "local relocation found with external relocations";
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throw "external relocation address not in writable segment";
- // FIX: check r_symbol
-}
-
-template <>
-void MachOChecker<ppc64>::checkExternalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_length() != 3 )
- throw "bad external relocation length";
- if ( reloc->r_type() != GENERIC_RELOC_VANILLA )
- throw "unknown external relocation type";
- if ( reloc->r_pcrel() != 0 )
- throw "bad external relocation pc_rel";
- if ( reloc->r_extern() == 0 )
- throw "local relocation found with external relocations";
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throw "external relocation address not in writable segment";
- // FIX: check r_symbol
-}
-
-template <>
-void MachOChecker<x86>::checkExternalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_length() != 2 )
- throw "bad external relocation length";
- if ( reloc->r_type() != GENERIC_RELOC_VANILLA )
- throw "unknown external relocation type";
- if ( reloc->r_pcrel() != 0 )
- throw "bad external relocation pc_rel";
- if ( reloc->r_extern() == 0 )
- throw "local relocation found with external relocations";
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throw "external relocation address not in writable segment";
- // FIX: check r_symbol
-}
-
-
-template <>
-void MachOChecker<x86_64>::checkExternalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_length() != 3 )
- throw "bad external relocation length";
- if ( reloc->r_type() != X86_64_RELOC_UNSIGNED )
- throw "unknown external relocation type";
- if ( reloc->r_pcrel() != 0 )
- throw "bad external relocation pc_rel";
- if ( reloc->r_extern() == 0 )
- throw "local relocation found with external relocations";
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throw "exernal relocation address not in writable segment";
- // FIX: check r_symbol
-}
-
-template <>
-void MachOChecker<arm>::checkExternalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_length() != 2 )
- throw "bad external relocation length";
- if ( reloc->r_type() != ARM_RELOC_VANILLA )
- throw "unknown external relocation type";
- if ( reloc->r_pcrel() != 0 )
- throw "bad external relocation pc_rel";
- if ( reloc->r_extern() == 0 )
- throw "local relocation found with external relocations";
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throw "external relocation address not in writable segment";
- // FIX: check r_symbol
-}
-
-
-template <>
-void MachOChecker<ppc>::checkLocalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_address() & R_SCATTERED ) {
- // scattered
- const macho_scattered_relocation_info<P>* sreloc = (const macho_scattered_relocation_info<P>*)reloc;
- // FIX
-
- }
- else {
- // ignore pair relocs
- if ( reloc->r_type() == PPC_RELOC_PAIR )
- return;
- // FIX
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throwf("local relocation address 0x%08X not in writable segment", reloc->r_address());
- }
-}
-
-
-template <>
-void MachOChecker<ppc64>::checkLocalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_length() != 3 )
- throw "bad local relocation length";
- if ( reloc->r_type() != GENERIC_RELOC_VANILLA )
- throw "unknown local relocation type";
- if ( reloc->r_pcrel() != 0 )
- throw "bad local relocation pc_rel";
- if ( reloc->r_extern() != 0 )
- throw "external relocation found with local relocations";
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throw "local relocation address not in writable segment";
-}
-
-template <>
-void MachOChecker<x86>::checkLocalReloation(const macho_relocation_info<P>* reloc)
-{
- // FIX
-}
-
-template <>
-void MachOChecker<x86_64>::checkLocalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_length() != 3 )
- throw "bad local relocation length";
- if ( reloc->r_type() != X86_64_RELOC_UNSIGNED )
- throw "unknown local relocation type";
- if ( reloc->r_pcrel() != 0 )
- throw "bad local relocation pc_rel";
- if ( reloc->r_extern() != 0 )
- throw "external relocation found with local relocations";
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throw "local relocation address not in writable segment";
-}
-
-template <>
-void MachOChecker<arm>::checkLocalReloation(const macho_relocation_info<P>* reloc)
-{
- if ( reloc->r_address() & R_SCATTERED ) {
- // scattered
- const macho_scattered_relocation_info<P>* sreloc = (const macho_scattered_relocation_info<P>*)reloc;
- if ( sreloc->r_length() != 2 )
- throw "bad local scattered relocation length";
- if ( sreloc->r_type() != ARM_RELOC_PB_LA_PTR )
- throw "bad local scattered relocation type";
- }
- else {
- if ( reloc->r_length() != 2 )
- throw "bad local relocation length";
- if ( reloc->r_extern() != 0 )
- throw "external relocation found with local relocations";
- if ( ! this->addressInWritableSegment(reloc->r_address() + this->relocBase()) )
- throw "local relocation address not in writable segment";
- }
-}
-
-template <typename A>
-void MachOChecker<A>::checkRelocations()
-{
- // external relocations should be sorted to minimize dyld symbol lookups
- // therefore every reloc with the same r_symbolnum value should be contiguous
- std::set<uint32_t> previouslySeenSymbolIndexes;
- uint32_t lastSymbolIndex = 0xFFFFFFFF;
- const macho_relocation_info<P>* const externRelocsEnd = &fExternalRelocations[fExternalRelocationsCount];
- for (const macho_relocation_info<P>* reloc = fExternalRelocations; reloc < externRelocsEnd; ++reloc) {
- this->checkExternalReloation(reloc);
- if ( reloc->r_symbolnum() != lastSymbolIndex ) {
- if ( previouslySeenSymbolIndexes.count(reloc->r_symbolnum()) != 0 )
- throw "external relocations not sorted";
- previouslySeenSymbolIndexes.insert(lastSymbolIndex);
- lastSymbolIndex = reloc->r_symbolnum();
- }
- }
-
- const macho_relocation_info<P>* const localRelocsEnd = &fLocalRelocations[fLocalRelocationsCount];
- for (const macho_relocation_info<P>* reloc = fLocalRelocations; reloc < localRelocsEnd; ++reloc) {
- this->checkLocalReloation(reloc);
- }
-}
-
-
-static void check(const char* path)
-{
- struct stat stat_buf;
-
- try {
- int fd = ::open(path, O_RDONLY, 0);
- if ( fd == -1 )
- throw "cannot open file";
- ::fstat(fd, &stat_buf);
- uint32_t length = stat_buf.st_size;
- uint8_t* p = (uint8_t*)::mmap(NULL, stat_buf.st_size, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, 0);
- if ( p == ((uint8_t*)(-1)) )
- throw "cannot map file";
- ::close(fd);
- const mach_header* mh = (mach_header*)p;
- if ( mh->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
- const struct fat_header* fh = (struct fat_header*)p;
- const struct fat_arch* archs = (struct fat_arch*)(p + sizeof(struct fat_header));
- for (unsigned long i=0; i < OSSwapBigToHostInt32(fh->nfat_arch); ++i) {
- size_t offset = OSSwapBigToHostInt32(archs[i].offset);
- size_t size = OSSwapBigToHostInt32(archs[i].size);
- unsigned int cputype = OSSwapBigToHostInt32(archs[i].cputype);
-
- switch(cputype) {
- case CPU_TYPE_POWERPC:
- if ( MachOChecker<ppc>::validFile(p + offset) )
- MachOChecker<ppc>::make(p + offset, size, path);
- else
- throw "in universal file, ppc slice does not contain ppc mach-o";
- break;
- case CPU_TYPE_I386:
- if ( MachOChecker<x86>::validFile(p + offset) )
- MachOChecker<x86>::make(p + offset, size, path);
- else
- throw "in universal file, i386 slice does not contain i386 mach-o";
- break;
- case CPU_TYPE_POWERPC64:
- if ( MachOChecker<ppc64>::validFile(p + offset) )
- MachOChecker<ppc64>::make(p + offset, size, path);
- else
- throw "in universal file, ppc64 slice does not contain ppc64 mach-o";
- break;
- case CPU_TYPE_X86_64:
- if ( MachOChecker<x86_64>::validFile(p + offset) )
- MachOChecker<x86_64>::make(p + offset, size, path);
- else
- throw "in universal file, x86_64 slice does not contain x86_64 mach-o";
- break;
- case CPU_TYPE_ARM:
- if ( MachOChecker<arm>::validFile(p + offset) )
- MachOChecker<arm>::make(p + offset, size, path);
- else
- throw "in universal file, arm slice does not contain arm mach-o";
- break;
- default:
- throwf("in universal file, unknown architecture slice 0x%x\n", cputype);
- }
- }
- }
- else if ( MachOChecker<x86>::validFile(p) ) {
- MachOChecker<x86>::make(p, length, path);
- }
- else if ( MachOChecker<ppc>::validFile(p) ) {
- MachOChecker<ppc>::make(p, length, path);
- }
- else if ( MachOChecker<ppc64>::validFile(p) ) {
- MachOChecker<ppc64>::make(p, length, path);
- }
- else if ( MachOChecker<x86_64>::validFile(p) ) {
- MachOChecker<x86_64>::make(p, length, path);
- }
- else if ( MachOChecker<arm>::validFile(p) ) {
- MachOChecker<arm>::make(p, length, path);
- }
- else {
- throw "not a known file type";
- }
- }
- catch (const char* msg) {
- throwf("%s in %s", msg, path);
- }
-}
-
-
-int main(int argc, const char* argv[])
-{
- try {
- for(int i=1; i < argc; ++i) {
- const char* arg = argv[i];
- if ( arg[0] == '-' ) {
- if ( strcmp(arg, "-no_content") == 0 ) {
-
- }
- else {
- throwf("unknown option: %s\n", arg);
- }
- }
- else {
- check(arg);
- }
- }
- }
- catch (const char* msg) {
- fprintf(stderr, "machocheck failed: %s\n", msg);
- return 1;
- }
-
- return 0;
-}
-
-
-
projects / apple / ld64.git / blobdiff