#include "mach-o/dyld_images.h"
// in dyldStartup.s
-extern "C" void fast_stub_binding_helper_interface();
+extern "C" void stub_binding_helper_i386_old();
#if __x86_64__
// 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);
}
// create image by mapping in a mach-o file
-ImageLoaderMachOClassic* ImageLoaderMachOClassic::instantiateFromFile(const char* path, int fd, const uint8_t* fileData,
+ImageLoaderMachOClassic* ImageLoaderMachOClassic::instantiateFromFile(const char* path, int fd, const uint8_t* fileData, size_t lenFileData,
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)
// if this image is code signed, let kernel validate signature before mapping any pages from image
image->loadCodeSignature(codeSigCmd, fd, offsetInFat, context);
+ // 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);
// 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 ) {
// for compatibility, never unload dylibs loaded from memory
image->setNeverUnload();
+ image->disableCoverageCheck();
+
// bundle loads need path copied
if ( moduleName != NULL )
image->setPath(moduleName);
void ImageLoaderMachOClassic::instantiateFinish(const LinkContext& context)
{
// now that segments are mapped in, get real fMachOData, fLinkEditBase, and fSlide
- this->parseLoadCmds();
+ this->parseLoadCmds(context);
}
ImageLoaderMachOClassic::~ImageLoaderMachOClassic()
end += fSymbolTable[fDynamicInfo->iextdefsym+fDynamicInfo->nextdefsym-1].n_un.n_strx;
// round to whole pages
- start = start & (-4096);
- end = (end + 4095) & (-4096);
+ start = dyld_page_trunc(start);
+ end = dyld_page_round(end);
// skip if there is only one page
- if ( (end-start) > 4096 ) {
+ if ( (end-start) > dyld_page_size ) {
madvise((void*)start, end-start, MADV_WILLNEED);
fgTotalBytesPreFetched += (end-start);
if ( context.verboseMapping ) {
const char* lastSlash = strrchr(childInstallPath, '/');
if ( lastSlash != NULL ) {
const char* firstDot = strchr(lastSlash, '.');
- int len;
+ size_t len;
if ( firstDot == NULL )
len = strlen(lastSlash);
else
// 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.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);
}
// nowhere to be found
- throwSymbolNotFound(context, symbolName, this->getPath(), target->getPath());
+ throwSymbolNotFound(context, symbolName, this->getPath(), "", target->getPath());
}
}
const uint8_t type = sect->flags & SECTION_TYPE;
uint32_t symbolIndex = INDIRECT_SYMBOL_LOCAL;
if ( type == S_LAZY_SYMBOL_POINTERS ) {
- const uint32_t pointerCount = sect->size / sizeof(uintptr_t);
+ const size_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 uint32_t lazyIndex = lazyPointer - symbolPointers;
+ const size_t lazyIndex = lazyPointer - symbolPointers;
symbolIndex = indirectTable[indirectTableOffset + lazyIndex];
}
}
symbol_index = toc[it.curIndex-1].symbol_index;
}
else {
- symbol_index = fDynamicInfo->iextdefsym+it.curIndex-1;
+ symbol_index = fDynamicInfo->iextdefsym + (uint32_t)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());
symbol_index = toc[it.curIndex-1].symbol_index;
}
else {
- symbol_index = fDynamicInfo->iextdefsym+it.curIndex-1;
+ symbol_index = fDynamicInfo->iextdefsym + (uint32_t)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
case S_NON_LAZY_SYMBOL_POINTERS:
case S_LAZY_SYMBOL_POINTERS:
{
- uint32_t elementCount = sect->size / elementSize;
+ size_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 (uint32_t j=0; j < elementCount; ++j, ptrToBind += elementSize) {
+ for (size_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
bool isLazySymbol = false;
const uint8_t type = sect->flags & SECTION_TYPE;
uint32_t elementSize = sizeof(uintptr_t);
- uint32_t elementCount = sect->size / elementSize;
+ size_t elementCount = sect->size / elementSize;
if ( type == S_NON_LAZY_SYMBOL_POINTERS ) {
if ( ! bindNonLazys )
continue;
}
const uint32_t indirectTableOffset = sect->reserved1;
uint8_t* ptrToBind = (uint8_t*)(sect->addr + fSlide);
- for (uint32_t j=0; j < elementCount; ++j, ptrToBind += elementSize) {
+ for (size_t j=0; j < elementCount; ++j, ptrToBind += elementSize) {
#if LINKEDIT_USAGE_DEBUG
noteAccessedLinkEditAddress(&indirectTable[indirectTableOffset + j]);
#endif
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)&fast_stub_binding_helper_interface;
+ uintptr_t dyldHandler = (uintptr_t)&stub_binding_helper_i386_old;
uint32_t entryIndex = 0;
for (uint8_t* entry = start; entry < end; entry += 5, ++entryIndex) {
bool installLazyHandler = true;
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 uint32_t pointerCount = sect->size / sizeof(uintptr_t);
+ const size_t pointerCount = sect->size / sizeof(uintptr_t);
uintptr_t* const symbolPointers = (uintptr_t*)(sect->addr + fSlide);
- 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;
- }
- }
+ for (size_t pointerIndex=0; pointerIndex < pointerCount; ++pointerIndex) {
+ uintptr_t newValue = interposedAddress(context, symbolPointers[pointerIndex], this);
+ if ( newValue != symbolPointers[pointerIndex] )
+ symbolPointers[pointerIndex] = newValue;
}
}
#if __i386__
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;
- 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
- }
+ 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
}
}
}
case POINTER_RELOC:
{
uintptr_t* location = ((uintptr_t*)(reloc->r_address + relocBase));
- for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ 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;
+ }
+ }
+ }
+ }
+ }
+ }
+ 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 == it->replacee) && (this != it->replacementImage) ) {
+ if ( *location == (uintptr_t)context.dynamicInterposeArray[i].replacee ) {
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());
+ 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 = it->replacement;
+ *location = (uintptr_t)context.dynamicInterposeArray[i].replacement;
}
}
}
projects / apple / dyld.git / blobdiff