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--- dyld/dyld-360.22/src/ImageLoaderMachOClassic.cpp
+++ dyld/dyld-210.2.3/src/ImageLoaderMachOClassic.cpp
@@ -55,7 +55,7 @@
#include "mach-o/dyld_images.h"
// in dyldStartup.s
-extern "C" void stub_binding_helper_i386_old();
+extern "C" void fast_stub_binding_helper_interface();
#if __x86_64__
@@ -97,8 +97,7 @@
// for PIE record end of program, to know where to start loading dylibs
if ( slide != 0 )
fgNextPIEDylibAddress = (uintptr_t)image->getEnd();
-
- image->disableCoverageCheck();
+
image->instantiateFinish(context);
image->setMapped(context);
@@ -127,7 +126,7 @@
}
// create image by mapping in a mach-o file
-ImageLoaderMachOClassic* ImageLoaderMachOClassic::instantiateFromFile(const char* path, int fd, const uint8_t* fileData, size_t lenFileData,
+ImageLoaderMachOClassic* ImageLoaderMachOClassic::instantiateFromFile(const char* path, int fd, const uint8_t* fileData,
uint64_t offsetInFat, uint64_t lenInFat, const struct stat& info,
unsigned int segCount, unsigned int libCount,
const struct linkedit_data_command* codeSigCmd, const LinkContext& context)
@@ -137,12 +136,12 @@
// record info about file
image->setFileInfo(info.st_dev, info.st_ino, info.st_mtime);
+ #if CODESIGNING_SUPPORT
// if this image is code signed, let kernel validate signature before mapping any pages from image
- image->loadCodeSignature(codeSigCmd, fd, offsetInFat, context);
+ if ( codeSigCmd != NULL )
+ image->loadCodeSignature(codeSigCmd, fd, offsetInFat);
+ #endif
- // Validate that first data we read with pread actually matches with code signature
- image->validateFirstPages(codeSigCmd, fd, fileData, lenFileData, offsetInFat, context);
-
// mmap segments
image->mapSegmentsClassic(fd, offsetInFat, lenInFat, info.st_size, context);
@@ -196,7 +195,6 @@
// remember this is from shared cache and cannot be unloaded
image->fInSharedCache = true;
image->setNeverUnload();
- image->disableCoverageCheck();
// segments already mapped in cache
if ( context.verboseMapping ) {
@@ -235,8 +233,6 @@
// for compatibility, never unload dylibs loaded from memory
image->setNeverUnload();
- image->disableCoverageCheck();
-
// bundle loads need path copied
if ( moduleName != NULL )
image->setPath(moduleName);
@@ -280,7 +276,7 @@
void ImageLoaderMachOClassic::instantiateFinish(const LinkContext& context)
{
// now that segments are mapped in, get real fMachOData, fLinkEditBase, and fSlide
- this->parseLoadCmds(context);
+ this->parseLoadCmds();
}
ImageLoaderMachOClassic::~ImageLoaderMachOClassic()
@@ -359,11 +355,11 @@
end += fSymbolTable[fDynamicInfo->iextdefsym+fDynamicInfo->nextdefsym-1].n_un.n_strx;
// round to whole pages
- start = dyld_page_trunc(start);
- end = dyld_page_round(end);
+ start = start & (-4096);
+ end = (end + 4095) & (-4096);
// skip if there is only one page
- if ( (end-start) > dyld_page_size ) {
+ if ( (end-start) > 4096 ) {
madvise((void*)start, end-start, MADV_WILLNEED);
fgTotalBytesPreFetched += (end-start);
if ( context.verboseMapping ) {
@@ -626,7 +622,7 @@
const char* lastSlash = strrchr(childInstallPath, '/');
if ( lastSlash != NULL ) {
const char* firstDot = strchr(lastSlash, '.');
- size_t len;
+ int len;
if ( firstDot == NULL )
len = strlen(lastSlash);
else
@@ -957,7 +953,7 @@
}
-uintptr_t ImageLoaderMachOClassic::exportedSymbolAddress(const LinkContext& context, const Symbol* symbol, const ImageLoader* requestor, bool runResolver) const
+uintptr_t ImageLoaderMachOClassic::exportedSymbolAddress(const LinkContext& context, const Symbol* symbol, bool runResolver) const
{
const struct macho_nlist* sym = (macho_nlist*)symbol;
uintptr_t result = sym->n_value + fSlide;
@@ -1062,8 +1058,8 @@
}
const Symbol* sym;
if ( context.flatExportFinder(symbolName, &sym, foundIn) ) {
- if ( *foundIn != this )
- context.addDynamicReference(this, const_cast<ImageLoader*>(*foundIn));
+ if ( (*foundIn != this) && !(*foundIn)->neverUnload() )
+ this->addDynamicReference(*foundIn);
return (*foundIn)->getExportedSymbolAddress(sym, context, this);
}
// if a bundle is loaded privately the above will not find its exports
@@ -1078,15 +1074,15 @@
// if reference is weak_import, then it is ok, just return 0
return 0;
}
- throwSymbolNotFound(context, symbolName, this->getPath(), "", "flat namespace");
+ throwSymbolNotFound(context, symbolName, this->getPath(), "flat namespace");
}
else {
// symbol requires searching images with coalesced symbols (not done during prebinding)
if ( !context.prebinding && !dontCoalesce && (symbolIsWeakReference(undefinedSymbol) || symbolIsWeakDefinition(undefinedSymbol)) ) {
const Symbol* sym;
if ( context.coalescedExportFinder(symbolName, &sym, foundIn) ) {
- if ( *foundIn != this )
- context.addDynamicReference(this, const_cast<ImageLoader*>(*foundIn));
+ if ( (*foundIn != this) && !(*foundIn)->neverUnload() )
+ this->addDynamicReference(*foundIn);
return (*foundIn)->getExportedSymbolAddress(sym, context, this);
}
//throwSymbolNotFound(context, symbolName, this->getPath(), "coalesced namespace");
@@ -1123,7 +1119,7 @@
if ( context.flatExportFinder(symbolName, &sym, foundIn) )
return (*foundIn)->getExportedSymbolAddress(sym, context, this);
- throwSymbolNotFound(context, symbolName, this->getPath(), "", "dynamic lookup");
+ throwSymbolNotFound(context, symbolName, this->getPath(), "dynamic lookup");
}
else if ( ord <= libraryCount() ) {
target = libImage(ord-1);
@@ -1157,7 +1153,7 @@
}
// nowhere to be found
- throwSymbolNotFound(context, symbolName, this->getPath(), "", target->getPath());
+ throwSymbolNotFound(context, symbolName, this->getPath(), target->getPath());
}
}
@@ -1409,11 +1405,11 @@
const uint8_t type = sect->flags & SECTION_TYPE;
uint32_t symbolIndex = INDIRECT_SYMBOL_LOCAL;
if ( type == S_LAZY_SYMBOL_POINTERS ) {
- const size_t pointerCount = sect->size / sizeof(uintptr_t);
+ const uint32_t pointerCount = sect->size / sizeof(uintptr_t);
uintptr_t* const symbolPointers = (uintptr_t*)(sect->addr + fSlide);
if ( (lazyPointer >= symbolPointers) && (lazyPointer < &symbolPointers[pointerCount]) ) {
const uint32_t indirectTableOffset = sect->reserved1;
- const size_t lazyIndex = lazyPointer - symbolPointers;
+ const uint32_t lazyIndex = lazyPointer - symbolPointers;
symbolIndex = indirectTable[indirectTableOffset + lazyIndex];
}
}
@@ -1526,7 +1522,7 @@
symbol_index = toc[it.curIndex-1].symbol_index;
}
else {
- symbol_index = fDynamicInfo->iextdefsym + (uint32_t)it.curIndex - 1;
+ symbol_index = fDynamicInfo->iextdefsym+it.curIndex-1;
}
const struct macho_nlist* sym = &fSymbolTable[symbol_index];
//dyld::log("getAddressCoalIterator() => 0x%llX, %s symbol_index=%d, in %s\n", (uint64_t)(sym->n_value + fSlide), &fStrings[sym->n_un.n_strx], symbol_index, this->getPath());
@@ -1561,7 +1557,7 @@
symbol_index = toc[it.curIndex-1].symbol_index;
}
else {
- symbol_index = fDynamicInfo->iextdefsym + (uint32_t)it.curIndex - 1;
+ symbol_index = fDynamicInfo->iextdefsym+it.curIndex-1;
}
// if this image's copy of the symbol is not a weak definition nor a weak reference then nothing to coalesce here
@@ -1671,11 +1667,11 @@
case S_NON_LAZY_SYMBOL_POINTERS:
case S_LAZY_SYMBOL_POINTERS:
{
- size_t elementCount = sect->size / elementSize;
+ uint32_t elementCount = sect->size / elementSize;
const uint32_t indirectTableOffset = sect->reserved1;
uint8_t* ptrToBind = (uint8_t*)(sect->addr + fSlide);
//dyld::log(" scanning section %s of %s starting at %p\n", sect->sectname, this->getShortName(), ptrToBind);
- for (size_t j=0; j < elementCount; ++j, ptrToBind += elementSize) {
+ for (uint32_t j=0; j < elementCount; ++j, ptrToBind += elementSize) {
if ( indirectTable[indirectTableOffset + j] == symbol_index ) {
//dyld::log(" found symbol index match at %d/%d, ptrToBind=%p\n", j, elementCount, ptrToBind);
// update pointer
@@ -1690,9 +1686,8 @@
}
cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
}
- if ( boundSomething && (targetImage != this) ) {
- context.addDynamicReference(this, targetImage);
- }
+ if ( boundSomething && (targetImage != this) && !targetImage->neverUnload() )
+ this->addDynamicReference(targetImage);
// mark that this symbol has already been bound, so we don't try to bind again
it.type = 1;
@@ -1718,7 +1713,7 @@
bool isLazySymbol = false;
const uint8_t type = sect->flags & SECTION_TYPE;
uint32_t elementSize = sizeof(uintptr_t);
- size_t elementCount = sect->size / elementSize;
+ uint32_t elementCount = sect->size / elementSize;
if ( type == S_NON_LAZY_SYMBOL_POINTERS ) {
if ( ! bindNonLazys )
continue;
@@ -1746,7 +1741,7 @@
}
const uint32_t indirectTableOffset = sect->reserved1;
uint8_t* ptrToBind = (uint8_t*)(sect->addr + fSlide);
- for (size_t j=0; j < elementCount; ++j, ptrToBind += elementSize) {
+ for (uint32_t j=0; j < elementCount; ++j, ptrToBind += elementSize) {
#if LINKEDIT_USAGE_DEBUG
noteAccessedLinkEditAddress(&indirectTable[indirectTableOffset + j]);
#endif
@@ -1839,7 +1834,7 @@
const uint32_t* const indirectTable = (uint32_t*)&fLinkEditBase[fDynamicInfo->indirectsymoff];
uint8_t* start = (uint8_t*)(sect->addr + this->fSlide);
uint8_t* end = start + sect->size;
- uintptr_t dyldHandler = (uintptr_t)&stub_binding_helper_i386_old;
+ uintptr_t dyldHandler = (uintptr_t)&fast_stub_binding_helper_interface;
uint32_t entryIndex = 0;
for (uint8_t* entry = start; entry < end; entry += 5, ++entryIndex) {
bool installLazyHandler = true;
@@ -1957,12 +1952,19 @@
for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
const uint8_t type = sect->flags & SECTION_TYPE;
if ( (type == S_NON_LAZY_SYMBOL_POINTERS) || (type == S_LAZY_SYMBOL_POINTERS) ) {
- const size_t pointerCount = sect->size / sizeof(uintptr_t);
+ const uint32_t pointerCount = sect->size / sizeof(uintptr_t);
uintptr_t* const symbolPointers = (uintptr_t*)(sect->addr + fSlide);
- for (size_t pointerIndex=0; pointerIndex < pointerCount; ++pointerIndex) {
- uintptr_t newValue = interposedAddress(context, symbolPointers[pointerIndex], this);
- if ( newValue != symbolPointers[pointerIndex] )
- symbolPointers[pointerIndex] = newValue;
+ for (uint32_t pointerIndex=0; pointerIndex < pointerCount; ++pointerIndex) {
+ for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ // replace all references to 'replacee' with 'replacement'
+ if ( (symbolPointers[pointerIndex] == it->replacee) && (this != it->replacementImage) ) {
+ if ( context.verboseInterposing ) {
+ dyld::log("dyld: interposing: at %p replace 0x%lX with 0x%lX in %s\n",
+ &symbolPointers[pointerIndex], it->replacee, it->replacement, this->getPath());
+ }
+ symbolPointers[pointerIndex] = it->replacement;
+ }
+ }
}
}
#if __i386__
@@ -1975,10 +1977,16 @@
if ( entry[0] == 0xE9 ) { // 0xE9 == JMP
uint32_t rel32 = *((uint32_t*)&entry[1]); // assume unaligned load of uint32_t is ok
uint32_t target = (uint32_t)&entry[5] + rel32;
- uint32_t newTarget = interposedAddress(context, target, this);
- if ( newTarget != target ) {
- uint32_t newRel32 = newTarget - (uint32_t)&entry[5];
- *((uint32_t*)&entry[1]) = newRel32; // assume unaligned store of uint32_t is ok
+ for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ // replace all references to 'replacee' with 'replacement'
+ if ( (it->replacee == target) && (this != it->replacementImage) ) {
+ if ( context.verboseInterposing ) {
+ dyld::log("dyld: interposing: at %p replace JMP 0x%lX with JMP 0x%lX in %s\n",
+ &entry[1], it->replacee, it->replacement, this->getPath());
+ }
+ uint32_t newRel32 = it->replacement - (uint32_t)&entry[5];
+ *((uint32_t*)&entry[1]) = newRel32; // assume unaligned store of uint32_t is ok
+ }
}
}
}
@@ -2001,76 +2009,14 @@
case POINTER_RELOC:
{
uintptr_t* location = ((uintptr_t*)(reloc->r_address + relocBase));
- uintptr_t value = *location;
- uintptr_t newValue = interposedAddress(context, value, this);
- if ( newValue != value )
- *location = newValue;
- }
- break;
- }
- }
- }
-}
-
-void ImageLoaderMachOClassic::dynamicInterpose(const LinkContext& context)
-{
- if ( context.verboseInterposing )
- dyld::log("dyld: dynamic interposing %lu tuples onto image: %s\n", context.dynamicInterposeCount, this->getPath());
-
- // scan indirect symbols
- const uint32_t cmd_count = ((macho_header*)fMachOData)->ncmds;
- const struct load_command* const cmds = (struct load_command*)&fMachOData[sizeof(macho_header)];
- const struct load_command* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch (cmd->cmd) {
- case LC_SEGMENT_COMMAND:
- {
- const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
- const struct macho_section* const sectionsStart = (struct macho_section*)((char*)seg + sizeof(struct macho_segment_command));
- const struct macho_section* const sectionsEnd = §ionsStart[seg->nsects];
- for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
- const uint8_t type = sect->flags & SECTION_TYPE;
- if ( (type == S_NON_LAZY_SYMBOL_POINTERS) || (type == S_LAZY_SYMBOL_POINTERS) ) {
- const size_t pointerCount = sect->size / sizeof(uintptr_t);
- uintptr_t* const symbolPointers = (uintptr_t*)(sect->addr + fSlide);
- for (size_t pointerIndex=0; pointerIndex < pointerCount; ++pointerIndex) {
- for(size_t i=0; i < context.dynamicInterposeCount; ++i) {
- // replace all references to 'replacee' with 'replacement'
- if ( symbolPointers[pointerIndex] == (uintptr_t)context.dynamicInterposeArray[i].replacee ) {
- if ( context.verboseInterposing ) {
- dyld::log("dyld: dynamic interposing: at %p replace %p with %p in %s\n",
- &symbolPointers[pointerIndex], context.dynamicInterposeArray[i].replacee, context.dynamicInterposeArray[i].replacement, this->getPath());
- }
- symbolPointers[pointerIndex] = (uintptr_t)context.dynamicInterposeArray[i].replacement;
- }
+ for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ // replace all references to 'replacee' with 'replacement'
+ if ( (*location == it->replacee) && (this != it->replacementImage) ) {
+ if ( context.verboseInterposing ) {
+ dyld::log("dyld: interposing: at %p replace 0x%lX with 0x%lX in %s\n",
+ location, it->replacee, it->replacement, this->getPath());
}
- }
- }
- }
- }
- break;
- }
- cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
- }
-
- // scan external relocations
- const uintptr_t relocBase = this->getRelocBase();
- const relocation_info* const relocsStart = (struct relocation_info*)(&fLinkEditBase[fDynamicInfo->extreloff]);
- const relocation_info* const relocsEnd = &relocsStart[fDynamicInfo->nextrel];
- for (const relocation_info* reloc=relocsStart; reloc < relocsEnd; ++reloc) {
- if (reloc->r_length == RELOC_SIZE) {
- switch(reloc->r_type) {
- case POINTER_RELOC:
- {
- uintptr_t* location = ((uintptr_t*)(reloc->r_address + relocBase));
- for(size_t i=0; i < context.dynamicInterposeCount; ++i) {
- // replace all references to 'replacee' with 'replacement'
- if ( *location == (uintptr_t)context.dynamicInterposeArray[i].replacee ) {
- if ( context.verboseInterposing ) {
- dyld::log("dyld: dynamic interposing: at %p replace %p with %p in %s\n",
- location, context.dynamicInterposeArray[i].replacee, context.dynamicInterposeArray[i].replacement, this->getPath());
- }
- *location = (uintptr_t)context.dynamicInterposeArray[i].replacement;
+ *location = it->replacement;
}
}
}