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--- dyld/dyld-733.6/launch-cache/dsc_extractor.cpp
+++ /dev/null
@@ -1,883 +0,0 @@
-/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
- *
- * Copyright (c) 2011 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 <stdio.h>
-#include <unistd.h>
-#include <sys/stat.h>
-#include <string.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/mman.h>
-#include <sys/syslimits.h>
-#include <libkern/OSByteOrder.h>
-#include <mach-o/arch.h>
-#include <mach-o/loader.h>
-#include <Availability.h>
-
-#include "CodeSigningTypes.h"
-#include <CommonCrypto/CommonHMAC.h>
-#include <CommonCrypto/CommonDigest.h>
-#include <CommonCrypto/CommonDigestSPI.h>
-
-#define NO_ULEB
-#include "Architectures.hpp"
-#include "MachOFileAbstraction.hpp"
-#include "CacheFileAbstraction.hpp"
-
-#include "dsc_iterator.h"
-#include "dsc_extractor.h"
-#include "MachOTrie.hpp"
-#include "SupportedArchs.h"
-#include "DyldSharedCache.h"
-
-#include <vector>
-#include <set>
-#include <map>
-#include <unordered_map>
-#include <algorithm>
-#include <dispatch/dispatch.h>
-
-struct seg_info
-{
- seg_info(const char* n, uint64_t o, uint64_t s)
- : segName(n), offset(o), sizem(s) { }
- const char* segName;
- uint64_t offset;
- uint64_t sizem;
-};
-
-class CStringHash {
-public:
- size_t operator()(const char* __s) const {
- size_t __h = 0;
- for ( ; *__s; ++__s)
- __h = 5 * __h + *__s;
- return __h;
- };
-};
-class CStringEquals {
-public:
- bool operator()(const char* left, const char* right) const { return (strcmp(left, right) == 0); }
-};
-typedef std::unordered_map<const char*, std::vector<seg_info>, CStringHash, CStringEquals> NameToSegments;
-
-// Filter to find individual symbol re-exports in trie
-class NotReExportSymbol {
-public:
- NotReExportSymbol(const std::set<int> &rd) :_reexportDeps(rd) {}
- bool operator()(const mach_o::trie::Entry &entry) const {
- bool result = isSymbolReExport(entry);
- if (result) {
- // <rdar://problem/17671438> Xcode 6 leaks in dyld_shared_cache_extract_dylibs
- ::free((void*)entry.name);
- const_cast<mach_o::trie::Entry*>(&entry)->name = NULL;
- }
- return result;
- }
-private:
- bool isSymbolReExport(const mach_o::trie::Entry &entry) const {
- if ( (entry.flags & EXPORT_SYMBOL_FLAGS_KIND_MASK) != EXPORT_SYMBOL_FLAGS_KIND_REGULAR )
- return true;
- if ( (entry.flags & EXPORT_SYMBOL_FLAGS_REEXPORT) == 0 )
- return true;
- // If the symbol comes from a dylib that is re-exported, this is not an individual symbol re-export
- if ( _reexportDeps.count((int)entry.other) != 0 )
- return true;
- return false;
- }
- const std::set<int> &_reexportDeps;
-};
-
-template <typename P>
-struct LoadCommandInfo {
-};
-
-template <typename A>
-class LinkeditOptimizer {
- typedef typename A::P P;
- typedef typename A::P::E E;
- typedef typename A::P::uint_t pint_t;
-
-private:
- macho_segment_command<P>* linkEditSegCmd = NULL;
- macho_symtab_command<P>* symtab = NULL;
- macho_dysymtab_command<P>* dynamicSymTab = NULL;
- macho_linkedit_data_command<P>* functionStarts = NULL;
- macho_linkedit_data_command<P>* dataInCode = NULL;
- uint32_t exportsTrieOffset = 0;
- uint32_t exportsTrieSize = 0;
- std::set<int> reexportDeps;
-
-public:
-
- void optimize_loadcommands(macho_header<typename A::P>* mh)
- {
- typedef typename A::P P;
- typedef typename A::P::E E;
- typedef typename A::P::uint_t pint_t;
-
- // update header flags
- mh->set_flags(mh->flags() & 0x7FFFFFFF); // remove in-cache bit
-
- // update load commands
- uint64_t cumulativeFileSize = 0;
- const unsigned origLoadCommandsSize = mh->sizeofcmds();
- unsigned bytesRemaining = origLoadCommandsSize;
- unsigned removedCount = 0;
- const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)mh + sizeof(macho_header<P>));
- const uint32_t cmdCount = mh->ncmds();
- const macho_load_command<P>* cmd = cmds;
- int depIndex = 0;
- for (uint32_t i = 0; i < cmdCount; ++i) {
- bool remove = false;
- switch ( cmd->cmd() ) {
- case macho_segment_command<P>::CMD:
- {
- // update segment/section file offsets
- macho_segment_command<P>* segCmd = (macho_segment_command<P>*)cmd;
- segCmd->set_fileoff(cumulativeFileSize);
- segCmd->set_filesize(segCmd->vmsize());
- macho_section<P>* const sectionsStart = (macho_section<P>*)((char*)segCmd + sizeof(macho_segment_command<P>));
- macho_section<P>* const sectionsEnd = §ionsStart[segCmd->nsects()];
- for(macho_section<P>* sect = sectionsStart; sect < sectionsEnd; ++sect) {
- if ( sect->offset() != 0 )
- sect->set_offset((uint32_t)(cumulativeFileSize+sect->addr()-segCmd->vmaddr()));
- }
- if ( strcmp(segCmd->segname(), "__LINKEDIT") == 0 ) {
- linkEditSegCmd = segCmd;
- }
- cumulativeFileSize += segCmd->filesize();
- break;
- }
- case LC_DYLD_INFO_ONLY:
- {
- // zero out all dyld info
- macho_dyld_info_command<P>* dyldInfo = (macho_dyld_info_command<P>*)cmd;
- exportsTrieOffset = dyldInfo->export_off();
- exportsTrieSize = dyldInfo->export_size();
- dyldInfo->set_rebase_off(0);
- dyldInfo->set_rebase_size(0);
- dyldInfo->set_bind_off(0);
- dyldInfo->set_bind_size(0);
- dyldInfo->set_weak_bind_off(0);
- dyldInfo->set_weak_bind_size(0);
- dyldInfo->set_lazy_bind_off(0);
- dyldInfo->set_lazy_bind_size(0);
- dyldInfo->set_export_off(0);
- dyldInfo->set_export_size(0);
- }
- break;
- case LC_SYMTAB:
- symtab = (macho_symtab_command<P>*)cmd;
- break;
- case LC_DYSYMTAB:
- dynamicSymTab = (macho_dysymtab_command<P>*)cmd;
- break;
- case LC_FUNCTION_STARTS:
- functionStarts = (macho_linkedit_data_command<P>*)cmd;
- break;
- case LC_DATA_IN_CODE:
- dataInCode = (macho_linkedit_data_command<P>*)cmd;
- break;
- case LC_LOAD_DYLIB:
- case LC_LOAD_WEAK_DYLIB:
- case LC_REEXPORT_DYLIB:
- case LC_LOAD_UPWARD_DYLIB:
- ++depIndex;
- if ( cmd->cmd() == LC_REEXPORT_DYLIB ) {
- reexportDeps.insert(depIndex);
- }
- break;
- case LC_SEGMENT_SPLIT_INFO:
- // <rdar://problem/23212513> dylibs iOS 9 dyld caches have bogus LC_SEGMENT_SPLIT_INFO
- remove = true;
- break;
- }
- uint32_t cmdSize = cmd->cmdsize();
- macho_load_command<P>* nextCmd = (macho_load_command<P>*)(((uint8_t*)cmd)+cmdSize);
- if ( remove ) {
- ::memmove((void*)cmd, (void*)nextCmd, bytesRemaining);
- ++removedCount;
- }
- else {
- bytesRemaining -= cmdSize;
- cmd = nextCmd;
- }
- }
- // zero out stuff removed
- ::bzero((void*)cmd, bytesRemaining);
- // update header
- mh->set_ncmds(cmdCount - removedCount);
- mh->set_sizeofcmds(origLoadCommandsSize - bytesRemaining);
- }
-
- int optimize_linkedit(std::vector<uint8_t> &new_linkedit_data, uint64_t textOffsetInCache, const void* mapped_cache)
- {
- typedef typename A::P P;
- typedef typename A::P::E E;
- typedef typename A::P::uint_t pint_t;
-
- // rebuild symbol table
- if ( linkEditSegCmd == NULL ) {
- fprintf(stderr, "__LINKEDIT not found\n");
- return -1;
- }
- if ( symtab == NULL ) {
- fprintf(stderr, "LC_SYMTAB not found\n");
- return -1;
- }
- if ( dynamicSymTab == NULL ) {
- fprintf(stderr, "LC_DYSYMTAB not found\n");
- return -1;
- }
-
- const uint64_t newFunctionStartsOffset = new_linkedit_data.size();
- uint32_t functionStartsSize = 0;
- if ( functionStarts != NULL ) {
- // copy function starts from original cache file to new mapped dylib file
- functionStartsSize = functionStarts->datasize();
- new_linkedit_data.insert(new_linkedit_data.end(),
- (char*)mapped_cache + functionStarts->dataoff(),
- (char*)mapped_cache + functionStarts->dataoff() + functionStartsSize);
- }
-
- // pointer align
- while ((linkEditSegCmd->fileoff() + new_linkedit_data.size()) % sizeof(pint_t))
- new_linkedit_data.push_back(0);
-
- const uint64_t newDataInCodeOffset = new_linkedit_data.size();
- uint32_t dataInCodeSize = 0;
- if ( dataInCode != NULL ) {
- // copy data-in-code info from original cache file to new mapped dylib file
- dataInCodeSize = dataInCode->datasize();
- new_linkedit_data.insert(new_linkedit_data.end(),
- (char*)mapped_cache + dataInCode->dataoff(),
- (char*)mapped_cache + dataInCode->dataoff() + dataInCodeSize);
- }
-
- std::vector<mach_o::trie::Entry> exports;
- if ( exportsTrieSize != 0 ) {
- const uint8_t* exportsStart = ((uint8_t*)mapped_cache) + exportsTrieOffset;
- const uint8_t* exportsEnd = &exportsStart[exportsTrieSize];
- mach_o::trie::parseTrie(exportsStart, exportsEnd, exports);
- exports.erase(std::remove_if(exports.begin(), exports.end(), NotReExportSymbol(reexportDeps)), exports.end());
- }
-
- // look for local symbol info in unmapped part of shared cache
- dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)mapped_cache;
- macho_nlist<P>* localNlists = NULL;
- uint32_t localNlistCount = 0;
- const char* localStrings = NULL;
- const char* localStringsEnd = NULL;
- if ( header->mappingOffset() > offsetof(dyld_cache_header,localSymbolsSize) ) {
- dyldCacheLocalSymbolsInfo<E>* localInfo = (dyldCacheLocalSymbolsInfo<E>*)(((uint8_t*)mapped_cache) + header->localSymbolsOffset());
- dyldCacheLocalSymbolEntry<E>* entries = (dyldCacheLocalSymbolEntry<E>*)(((uint8_t*)mapped_cache) + header->localSymbolsOffset() + localInfo->entriesOffset());
- macho_nlist<P>* allLocalNlists = (macho_nlist<P>*)(((uint8_t*)localInfo) + localInfo->nlistOffset());
- const uint32_t entriesCount = localInfo->entriesCount();
- for (uint32_t i=0; i < entriesCount; ++i) {
- if ( entries[i].dylibOffset() == textOffsetInCache ) {
- uint32_t localNlistStart = entries[i].nlistStartIndex();
- localNlistCount = entries[i].nlistCount();
- localNlists = &allLocalNlists[localNlistStart];
- localStrings = ((char*)localInfo) + localInfo->stringsOffset();
- localStringsEnd = &localStrings[localInfo->stringsSize()];
- break;
- }
- }
- }
- // compute number of symbols in new symbol table
- const macho_nlist<P>* const mergedSymTabStart = (macho_nlist<P>*)(((uint8_t*)mapped_cache) + symtab->symoff());
- const macho_nlist<P>* const mergedSymTabend = &mergedSymTabStart[symtab->nsyms()];
- uint32_t newSymCount = symtab->nsyms();
- if ( localNlists != NULL ) {
- newSymCount = localNlistCount;
- for (const macho_nlist<P>* s = mergedSymTabStart; s != mergedSymTabend; ++s) {
- // skip any locals in cache
- if ( (s->n_type() & (N_TYPE|N_EXT)) == N_SECT )
- continue;
- ++newSymCount;
- }
- }
-
- // add room for N_INDR symbols for re-exported symbols
- newSymCount += exports.size();
-
- // copy symbol entries and strings from original cache file to new mapped dylib file
- const char* mergedStringPoolStart = (char*)mapped_cache + symtab->stroff();
- const char* mergedStringPoolEnd = &mergedStringPoolStart[symtab->strsize()];
-
- // First count how many entries we need
- std::vector<macho_nlist<P>> newSymTab;
- newSymTab.reserve(newSymCount);
- std::vector<char> newSymNames;
-
- // first pool entry is always empty string
- newSymNames.push_back('\0');
-
- for (const macho_nlist<P>* s = mergedSymTabStart; s != mergedSymTabend; ++s) {
- // if we have better local symbol info, skip any locals here
- if ( (localNlists != NULL) && ((s->n_type() & (N_TYPE|N_EXT)) == N_SECT) )
- continue;
- macho_nlist<P> t = *s;
- t.set_n_strx((uint32_t)newSymNames.size());
- const char* symName = &mergedStringPoolStart[s->n_strx()];
- if ( symName > mergedStringPoolEnd )
- symName = "<corrupt symbol name>";
- newSymNames.insert(newSymNames.end(),
- symName,
- symName + (strlen(symName) + 1));
- newSymTab.push_back(t);
- }
- // <rdar://problem/16529213> recreate N_INDR symbols in extracted dylibs for debugger
- for (std::vector<mach_o::trie::Entry>::iterator it = exports.begin(); it != exports.end(); ++it) {
- macho_nlist<P> t;
- memset(&t, 0, sizeof(t));
- t.set_n_strx((uint32_t)newSymNames.size());
- t.set_n_type(N_INDR | N_EXT);
- t.set_n_sect(0);
- t.set_n_desc(0);
- newSymNames.insert(newSymNames.end(),
- it->name,
- it->name + (strlen(it->name) + 1));
- const char* importName = it->importName;
- if ( *importName == '\0' )
- importName = it->name;
- t.set_n_value(newSymNames.size());
- newSymNames.insert(newSymNames.end(),
- importName,
- importName + (strlen(importName) + 1));
- newSymTab.push_back(t);
- }
- if ( localNlists != NULL ) {
- // update load command to reflect new count of locals
- dynamicSymTab->set_ilocalsym((uint32_t)newSymTab.size());
- dynamicSymTab->set_nlocalsym(localNlistCount);
- // copy local symbols
- for (uint32_t i=0; i < localNlistCount; ++i) {
- const char* localName = &localStrings[localNlists[i].n_strx()];
- if ( localName > localStringsEnd )
- localName = "<corrupt local symbol name>";
- macho_nlist<P> t = localNlists[i];
- t.set_n_strx((uint32_t)newSymNames.size());
- newSymNames.insert(newSymNames.end(),
- localName,
- localName + (strlen(localName) + 1));
- newSymTab.push_back(t);
- }
- }
-
- if ( newSymCount != newSymTab.size() ) {
- fprintf(stderr, "symbol count miscalculation\n");
- return -1;
- }
-
- //const uint64_t newStringPoolOffset = newIndSymTabOffset + dynamicSymTab->nindirectsyms()*sizeof(uint32_t);
- //macho_nlist<P>* const newSymTabStart = (macho_nlist<P>*)(((uint8_t*)mh) + newSymTabOffset);
- //char* const newStringPoolStart = (char*)mh + newStringPoolOffset;
-
- // pointer align
- while ((linkEditSegCmd->fileoff() + new_linkedit_data.size()) % sizeof(pint_t))
- new_linkedit_data.push_back(0);
-
- const uint64_t newSymTabOffset = new_linkedit_data.size();
-
- // Copy sym tab
- for (macho_nlist<P>& sym : newSymTab) {
- uint8_t symData[sizeof(macho_nlist<P>)];
- memcpy(&symData, &sym, sizeof(sym));
- new_linkedit_data.insert(new_linkedit_data.end(), &symData[0], &symData[sizeof(macho_nlist<P>)]);
- }
-
- const uint64_t newIndSymTabOffset = new_linkedit_data.size();
-
- // Copy indirect symbol table
- const uint32_t* mergedIndSymTab = (uint32_t*)((char*)mapped_cache + dynamicSymTab->indirectsymoff());
- new_linkedit_data.insert(new_linkedit_data.end(),
- (char*)mergedIndSymTab,
- (char*)(mergedIndSymTab + dynamicSymTab->nindirectsyms()));
-
- const uint64_t newStringPoolOffset = new_linkedit_data.size();
-
- // pointer align string pool size
- while (newSymNames.size() % sizeof(pint_t))
- newSymNames.push_back('\0');
-
- new_linkedit_data.insert(new_linkedit_data.end(), newSymNames.begin(), newSymNames.end());
-
- // update load commands
- if ( functionStarts != NULL ) {
- functionStarts->set_dataoff((uint32_t)(newFunctionStartsOffset + linkEditSegCmd->fileoff()));
- functionStarts->set_datasize(functionStartsSize);
- }
- if ( dataInCode != NULL ) {
- dataInCode->set_dataoff((uint32_t)(newDataInCodeOffset + linkEditSegCmd->fileoff()));
- dataInCode->set_datasize(dataInCodeSize);
- }
-
- symtab->set_nsyms(newSymCount);
- symtab->set_symoff((uint32_t)(newSymTabOffset + linkEditSegCmd->fileoff()));
- symtab->set_stroff((uint32_t)(newStringPoolOffset + linkEditSegCmd->fileoff()));
- symtab->set_strsize((uint32_t)newSymNames.size());
- dynamicSymTab->set_extreloff(0);
- dynamicSymTab->set_nextrel(0);
- dynamicSymTab->set_locreloff(0);
- dynamicSymTab->set_nlocrel(0);
- dynamicSymTab->set_indirectsymoff((uint32_t)(newIndSymTabOffset + linkEditSegCmd->fileoff()));
- linkEditSegCmd->set_filesize(symtab->stroff()+symtab->strsize() - linkEditSegCmd->fileoff());
- linkEditSegCmd->set_vmsize( (linkEditSegCmd->filesize()+4095) & (-4096) );
-
- // <rdar://problem/17671438> Xcode 6 leaks in dyld_shared_cache_extract_dylibs
- for (std::vector<mach_o::trie::Entry>::iterator it = exports.begin(); it != exports.end(); ++it) {
- ::free((void*)(it->name));
- }
-
-
- return 0;
- }
-
-};
-
-static void make_dirs(const char* file_path)
-{
- //printf("make_dirs(%s)\n", file_path);
- char dirs[strlen(file_path)+1];
- strcpy(dirs, file_path);
- char* lastSlash = strrchr(dirs, '/');
- if ( lastSlash == NULL )
- return;
- lastSlash[1] = '\0';
- struct stat stat_buf;
- if ( stat(dirs, &stat_buf) != 0 ) {
- char* afterSlash = &dirs[1];
- char* slash;
- while ( (slash = strchr(afterSlash, '/')) != NULL ) {
- *slash = '\0';
- ::mkdir(dirs, S_IRWXU | S_IRGRP|S_IXGRP | S_IROTH|S_IXOTH);
- //printf("mkdir(%s)\n", dirs);
- *slash = '/';
- afterSlash = slash+1;
- }
- }
-}
-
-
-
-template <typename A>
-void dylib_maker(const void* mapped_cache, std::vector<uint8_t> &dylib_data, const std::vector<seg_info>& segments) {
- typedef typename A::P P;
-
- size_t additionalSize = 0;
- for(std::vector<seg_info>::const_iterator it=segments.begin(); it != segments.end(); ++it) {
- if ( strcmp(it->segName, "__LINKEDIT") != 0 )
- additionalSize += it->sizem;
- }
-
- std::vector<uint8_t> new_dylib_data;
- new_dylib_data.reserve(additionalSize);
-
- // Write regular segments into the buffer
- uint64_t textOffsetInCache = 0;
- for( std::vector<seg_info>::const_iterator it=segments.begin(); it != segments.end(); ++it) {
-
- if(strcmp(it->segName, "__TEXT") == 0 )
- textOffsetInCache = it->offset;
-
- //printf("segName=%s, offset=0x%llX, size=0x%0llX\n", it->segName, it->offset, it->sizem);
- // Copy all but the __LINKEDIT. It will be copied later during the optimizer in to a temporary buffer but it would
- // not be efficient to copy it all now for each dylib.
- if (strcmp(it->segName, "__LINKEDIT") == 0 )
- continue;
- std::copy(((uint8_t*)mapped_cache)+it->offset, ((uint8_t*)mapped_cache)+it->offset+it->sizem, std::back_inserter(new_dylib_data));
- }
-
- // optimize linkedit
- std::vector<uint8_t> new_linkedit_data;
- new_linkedit_data.reserve(1 << 20);
-
- LinkeditOptimizer<A> linkeditOptimizer;
- macho_header<P>* mh = (macho_header<P>*)&new_dylib_data.front();
- linkeditOptimizer.optimize_loadcommands(mh);
- linkeditOptimizer.optimize_linkedit(new_linkedit_data, textOffsetInCache, mapped_cache);
-
- new_dylib_data.insert(new_dylib_data.end(), new_linkedit_data.begin(), new_linkedit_data.end());
-
- // Page align file
- while (new_dylib_data.size() % 4096)
- new_dylib_data.push_back(0);
-
- dylib_data.insert(dylib_data.end(), new_dylib_data.begin(), new_dylib_data.end());
-}
-
-typedef __typeof(dylib_maker<x86>) dylib_maker_func;
-typedef void (^progress_block)(unsigned current, unsigned total);
-
-class SharedCacheExtractor;
-struct SharedCacheDylibExtractor {
- SharedCacheDylibExtractor(const char* name, std::vector<seg_info> segInfo)
- : name(name), segInfo(segInfo) { }
-
- void extractCache(SharedCacheExtractor& context);
-
- const char* name;
- const std::vector<seg_info> segInfo;
- int result = 0;
-};
-
-struct SharedCacheExtractor {
- SharedCacheExtractor(const NameToSegments& map,
- const char* extraction_root_path,
- dylib_maker_func* dylib_create_func,
- void* mapped_cache,
- progress_block progress)
- : map(map), extraction_root_path(extraction_root_path),
- dylib_create_func(dylib_create_func), mapped_cache(mapped_cache),
- progress(progress) {
-
- extractors.reserve(map.size());
- for (auto it : map)
- extractors.emplace_back(it.first, it.second);
-
- // Limit the number of open files. 16 seems to give better performance than higher numbers.
- sema = dispatch_semaphore_create(16);
- }
- int extractCaches();
-
- static void extractCache(void *ctx, size_t i);
-
- const NameToSegments& map;
- std::vector<SharedCacheDylibExtractor> extractors;
- dispatch_semaphore_t sema;
- const char* extraction_root_path;
- dylib_maker_func* dylib_create_func;
- void* mapped_cache;
- progress_block progress;
- std::atomic_int count = { 0 };
-};
-
-int SharedCacheExtractor::extractCaches() {
- dispatch_queue_t process_queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0);
- dispatch_apply_f(map.size(), process_queue,
- this, extractCache);
-
- int result = 0;
- for (const SharedCacheDylibExtractor& extractor : extractors) {
- if (extractor.result != 0) {
- result = extractor.result;
- break;
- }
- }
- return result;
-}
-
-void SharedCacheExtractor::extractCache(void *ctx, size_t i) {
- SharedCacheExtractor& context = *(SharedCacheExtractor*)ctx;
- dispatch_semaphore_wait(context.sema, DISPATCH_TIME_FOREVER);
- context.extractors[i].extractCache(context);
- dispatch_semaphore_signal(context.sema);
-}
-
-void SharedCacheDylibExtractor::extractCache(SharedCacheExtractor &context) {
-
- char dylib_path[PATH_MAX];
- strcpy(dylib_path, context.extraction_root_path);
- strcat(dylib_path, "/");
- strcat(dylib_path, name);
-
- //printf("%s with %lu segments\n", dylib_path, it->second.size());
- // make sure all directories in this path exist
- make_dirs(dylib_path);
-
- // open file, create if does not already exist
- int fd = ::open(dylib_path, O_CREAT | O_TRUNC | O_EXLOCK | O_RDWR, 0644);
- if ( fd == -1 ) {
- fprintf(stderr, "can't open or create dylib file %s, errnor=%d\n", dylib_path, errno);
- result = -1;
- return;
- }
-
- std::vector<uint8_t> vec;
- context.dylib_create_func(context.mapped_cache, vec, segInfo);
- context.progress(context.count++, (unsigned)context.map.size());
-
- // Write file data
- if( write(fd, &vec.front(), vec.size()) == -1) {
- fprintf(stderr, "error writing, errnor=%d\n", errno);
- result = -1;
- }
-
- close(fd);
-}
-
-static int sharedCacheIsValid(const void* mapped_cache, uint64_t size) {
- // First check that the size is good.
- // Note the shared cache may not have a codeSignatureSize value set so we need to first make
- // sure we have space for the CS_SuperBlob, then later crack that to check for the size of the rest.
- const DyldSharedCache* dyldSharedCache = (DyldSharedCache*)mapped_cache;
- uint64_t requiredSizeForCSSuperBlob = dyldSharedCache->header.codeSignatureOffset + sizeof(CS_SuperBlob);
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((uint8_t*)mapped_cache + dyldSharedCache->header.mappingOffset);
- if ( requiredSizeForCSSuperBlob > size ) {
- fprintf(stderr, "Error: dyld shared cache size 0x%08llx is less than required size of 0x%08llx.\n", size, requiredSizeForCSSuperBlob);
- return -1;
- }
-
- // Now see if the code signatures are valid as that tells us the pages aren't corrupt.
- // First find all of the regions of the shared cache we computed cd hashes
- std::vector<std::pair<uint64_t, uint64_t>> sharedCacheRegions;
- sharedCacheRegions.emplace_back(std::make_pair(mappings[0].fileOffset, mappings[0].fileOffset + mappings[0].size));
- sharedCacheRegions.emplace_back(std::make_pair(mappings[1].fileOffset, mappings[1].fileOffset + mappings[1].size));
- sharedCacheRegions.emplace_back(std::make_pair(mappings[2].fileOffset, mappings[2].fileOffset + mappings[2].size));
- if (dyldSharedCache->header.localSymbolsSize)
- sharedCacheRegions.emplace_back(std::make_pair(dyldSharedCache->header.localSymbolsOffset, dyldSharedCache->header.localSymbolsOffset + dyldSharedCache->header.localSymbolsSize));
- size_t inBbufferSize = 0;
- for (auto& sharedCacheRegion : sharedCacheRegions)
- inBbufferSize += (sharedCacheRegion.second - sharedCacheRegion.first);
-
- // Now take the cd hash from the cache itself and validate the regions we found.
- uint8_t* codeSignatureRegion = (uint8_t*)mapped_cache + dyldSharedCache->header.codeSignatureOffset;
- CS_SuperBlob* sb = reinterpret_cast<CS_SuperBlob*>(codeSignatureRegion);
- if (sb->magic != htonl(CSMAGIC_EMBEDDED_SIGNATURE)) {
- fprintf(stderr, "Error: dyld shared cache code signature magic is incorrect.\n");
- return -1;
- }
-
- size_t sbSize = ntohl(sb->length);
- uint64_t requiredSizeForCS = dyldSharedCache->header.codeSignatureOffset + sbSize;
- if ( requiredSizeForCS > size ) {
- fprintf(stderr, "Error: dyld shared cache size 0x%08llx is less than required size of 0x%08llx.\n", size, requiredSizeForCS);
- return -1;
- }
-
- // Find the offset to the code directory.
- CS_CodeDirectory* cd = nullptr;
- for (unsigned i =0; i != sb->count; ++i) {
- if (ntohl(sb->index[i].type) == CSSLOT_CODEDIRECTORY) {
- cd = (CS_CodeDirectory*)(codeSignatureRegion + ntohl(sb->index[i].offset));
- break;
- }
- }
-
- if (!cd) {
- fprintf(stderr, "Error: dyld shared cache code signature directory is missing.\n");
- return -1;
- }
-
- if ( (uint8_t*)cd > (codeSignatureRegion + sbSize) ) {
- fprintf(stderr, "Error: dyld shared cache code signature directory is out of bounds.\n");
- return -1;
- }
-
- if ( cd->magic != htonl(CSMAGIC_CODEDIRECTORY) ) {
- fprintf(stderr, "Error: dyld shared cache code signature directory magic is incorrect.\n");
- return -1;
- }
-
- uint32_t pageSize = 1 << cd->pageSize;
- uint32_t slotCountFromRegions = (uint32_t)((inBbufferSize + pageSize - 1) / pageSize);
- if ( ntohl(cd->nCodeSlots) < slotCountFromRegions ) {
- fprintf(stderr, "Error: dyld shared cache code signature directory num slots is incorrect.\n");
- return -1;
- }
-
- uint32_t dscDigestFormat = kCCDigestNone;
- switch (cd->hashType) {
- case CS_HASHTYPE_SHA1:
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdeprecated-declarations"
- dscDigestFormat = kCCDigestSHA1;
-#pragma clang diagnostic pop
- break;
- case CS_HASHTYPE_SHA256:
- dscDigestFormat = kCCDigestSHA256;
- break;
- default:
- break;
- }
-
- if (dscDigestFormat != kCCDigestNone) {
- const uint64_t csPageSize = 1 << cd->pageSize;
- size_t hashOffset = ntohl(cd->hashOffset);
- uint8_t* hashSlot = (uint8_t*)cd + hashOffset;
- uint8_t cdHashBuffer[cd->hashSize];
-
- // Skip local symbols for now as those aren't being codesign correctly right now.
- size_t inBbufferSize = 0;
- for (auto& sharedCacheRegion : sharedCacheRegions) {
- if (sharedCacheRegion.first == dyldSharedCache->header.localSymbolsOffset)
- continue;
- inBbufferSize += (sharedCacheRegion.second - sharedCacheRegion.first);
- }
- uint32_t slotCountToProcess = (uint32_t)((inBbufferSize + pageSize - 1) / pageSize);
-
- for (unsigned i = 0; i != slotCountToProcess; ++i) {
- // Skip data pages as those may have been slid by ASLR in the extracted file
- uint64_t fileOffset = i * csPageSize;
- if ( (fileOffset >= mappings[1].fileOffset) && (fileOffset < (mappings[1].fileOffset + mappings[1].size)) )
- continue;
-
- CCDigest(dscDigestFormat, (uint8_t*)mapped_cache + fileOffset, (size_t)csPageSize, cdHashBuffer);
- uint8_t* cacheCdHashBuffer = hashSlot + (i * cd->hashSize);
- if (memcmp(cdHashBuffer, cacheCdHashBuffer, cd->hashSize) != 0) {
- fprintf(stderr, "Error: dyld shared cache code signature for page %d is incorrect.\n", i);
- return -1;
- }
- }
- }
- return 0;
-}
-
-int dyld_shared_cache_extract_dylibs_progress(const char* shared_cache_file_path, const char* extraction_root_path,
- progress_block progress)
-{
- struct stat statbuf;
- if (stat(shared_cache_file_path, &statbuf)) {
- fprintf(stderr, "Error: stat failed for dyld shared cache at %s\n", shared_cache_file_path);
- return -1;
- }
-
- int cache_fd = open(shared_cache_file_path, O_RDONLY);
- if (cache_fd < 0) {
- fprintf(stderr, "Error: failed to open shared cache file at %s\n", shared_cache_file_path);
- return -1;
- }
-
- void* mapped_cache = mmap(NULL, (size_t)statbuf.st_size, PROT_READ, MAP_PRIVATE, cache_fd, 0);
- if (mapped_cache == MAP_FAILED) {
- fprintf(stderr, "Error: mmap() for shared cache at %s failed, errno=%d\n", shared_cache_file_path, errno);
- return -1;
- }
-
- close(cache_fd);
-
- // instantiate arch specific dylib maker
- dylib_maker_func* dylib_create_func = nullptr;
- if ( strcmp((char*)mapped_cache, "dyld_v1 i386") == 0 )
- dylib_create_func = dylib_maker<x86>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 x86_64") == 0 )
- dylib_create_func = dylib_maker<x86_64>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 x86_64h") == 0 )
- dylib_create_func = dylib_maker<x86_64>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 armv5") == 0 )
- dylib_create_func = dylib_maker<arm>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 armv6") == 0 )
- dylib_create_func = dylib_maker<arm>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 armv7") == 0 )
- dylib_create_func = dylib_maker<arm>;
- else if ( strncmp((char*)mapped_cache, "dyld_v1 armv7", 14) == 0 )
- dylib_create_func = dylib_maker<arm>;
- else if ( strcmp((char*)mapped_cache, "dyld_v1 arm64") == 0 )
- dylib_create_func = dylib_maker<arm64>;
-#if SUPPORT_ARCH_arm64e
- else if ( strcmp((char*)mapped_cache, "dyld_v1 arm64e") == 0 )
- dylib_create_func = dylib_maker<arm64>;
-#endif
-#if SUPPORT_ARCH_arm64_32
- else if ( strcmp((char*)mapped_cache, "dyld_v1arm64_32") == 0 )
- dylib_create_func = dylib_maker<arm64_32>;
-#endif
- else {
- fprintf(stderr, "Error: unrecognized dyld shared cache magic.\n");
- munmap(mapped_cache, (size_t)statbuf.st_size);
- return -1;
- }
-
- // Verify that the cache isn't corrupt.
- if (int result = sharedCacheIsValid(mapped_cache, (uint64_t)statbuf.st_size)) {
- munmap(mapped_cache, (size_t)statbuf.st_size);
- return result;
- }
-
- // iterate through all images in cache and build map of dylibs and segments
- __block NameToSegments map;
- int result = 0;
-
- result = dyld_shared_cache_iterate(mapped_cache, (uint32_t)statbuf.st_size, ^(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo) {
- map[dylibInfo->path].push_back(seg_info(segInfo->name, segInfo->fileOffset, segInfo->fileSize));
- });
-
- if(result != 0) {
- fprintf(stderr, "Error: dyld_shared_cache_iterate_segments_with_slide failed.\n");
- munmap(mapped_cache, (size_t)statbuf.st_size);
- return result;
- }
-
- // for each dylib instantiate a dylib file
- SharedCacheExtractor extractor(map, extraction_root_path, dylib_create_func, mapped_cache, progress);
- result = extractor.extractCaches();
-
- munmap(mapped_cache, (size_t)statbuf.st_size);
- return result;
-}
-
-
-
-int dyld_shared_cache_extract_dylibs(const char* shared_cache_file_path, const char* extraction_root_path)
-{
- return dyld_shared_cache_extract_dylibs_progress(shared_cache_file_path, extraction_root_path,
- ^(unsigned , unsigned) {} );
-}
-
-
-#if 0
-// test program
-#include <stdio.h>
-#include <stddef.h>
-#include <dlfcn.h>
-
-
-typedef int (*extractor_proc)(const char* shared_cache_file_path, const char* extraction_root_path,
- void (^progress)(unsigned current, unsigned total));
-
-int main(int argc, const char* argv[])
-{
- if ( argc != 3 ) {
- fprintf(stderr, "usage: dsc_extractor <path-to-cache-file> <path-to-device-dir>\n");
- return 1;
- }
-
- //void* handle = dlopen("/Volumes/my/src/dyld/build/Debug/dsc_extractor.bundle", RTLD_LAZY);
- void* handle = dlopen("/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/usr/lib/dsc_extractor.bundle", RTLD_LAZY);
- if ( handle == NULL ) {
- fprintf(stderr, "dsc_extractor.bundle could not be loaded\n");
- return 1;
- }
-
- extractor_proc proc = (extractor_proc)dlsym(handle, "dyld_shared_cache_extract_dylibs_progress");
- if ( proc == NULL ) {
- fprintf(stderr, "dsc_extractor.bundle did not have dyld_shared_cache_extract_dylibs_progress symbol\n");
- return 1;
- }
-
- int result = (*proc)(argv[1], argv[2], ^(unsigned c, unsigned total) { printf("%d/%d\n", c, total); } );
- fprintf(stderr, "dyld_shared_cache_extract_dylibs_progress() => %d\n", result);
- return 0;
-}
-
-
-#endif
-
-
-
-