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--- dyld/dyld-640.2/src/ImageLoader.cpp
+++ dyld/dyld-732.8/src/ImageLoader.cpp
@@ -37,6 +37,8 @@
#include <sys/sysctl.h>
#include <libkern/OSAtomic.h>
+#include <atomic>
+
#include "Tracing.h"
#include "ImageLoader.h"
@@ -54,7 +56,6 @@
uint32_t ImageLoader::fgTotalPossibleLazyBindFixups = 0;
uint32_t ImageLoader::fgTotalSegmentsMapped = 0;
uint64_t ImageLoader::fgTotalBytesMapped = 0;
-uint64_t ImageLoader::fgTotalBytesPreFetched = 0;
uint64_t ImageLoader::fgTotalLoadLibrariesTime;
uint64_t ImageLoader::fgTotalObjCSetupTime = 0;
uint64_t ImageLoader::fgTotalDebuggerPausedTime = 0;
@@ -72,10 +73,10 @@
ImageLoader::ImageLoader(const char* path, unsigned int libCount)
- : fPath(path), fRealPath(NULL), fDevice(0), fInode(0), fLastModified(0),
+ : fPath(path), fRealPath(NULL), fDevice(0), fInode(0), fLastModified(0),
fPathHash(0), fDlopenReferenceCount(0), fInitializerRecursiveLock(NULL),
- fDepth(0), fLoadOrder(fgLoadOrdinal++), fState(0), fLibraryCount(libCount),
- fAllLibraryChecksumsAndLoadAddressesMatch(false), fLeaveMapped(false), fNeverUnload(false),
+ fLoadOrder(fgLoadOrdinal++), fDepth(0), fObjCMappedNotified(false), fState(0), fLibraryCount(libCount),
+ fMadeReadOnly(false), fAllLibraryChecksumsAndLoadAddressesMatch(false), fLeaveMapped(false), fNeverUnload(false),
fHideSymbols(false), fMatchByInstallName(false),
fInterposed(false), fRegisteredDOF(false), fAllLazyPointersBound(false),
fBeingRemoved(false), fAddFuncNotified(false),
@@ -136,13 +137,16 @@
void ImageLoader::setPath(const char* path)
{
- if ( fPathOwnedByImage && (fPath != NULL) )
+ if ( fPathOwnedByImage && (fPath != NULL) )
delete [] fPath;
fPath = new char[strlen(path)+1];
strcpy((char*)fPath, path);
fPathOwnedByImage = true; // delete fPath when this image is destructed
fPathHash = hash(fPath);
- fRealPath = NULL;
+ if ( fRealPath != NULL ) {
+ delete [] fRealPath;
+ fRealPath = NULL;
+ }
}
void ImageLoader::setPathUnowned(const char* path)
@@ -151,7 +155,7 @@
delete [] fPath;
}
fPath = path;
- fPathOwnedByImage = false;
+ fPathOwnedByImage = false;
fPathHash = hash(fPath);
}
@@ -162,14 +166,14 @@
strcpy((char*)fRealPath, realPath);
}
-const char* ImageLoader::getRealPath() const
-{
- if ( fRealPath != NULL )
+
+const char* ImageLoader::getRealPath() const
+{
+ if ( fRealPath != NULL )
return fRealPath;
else
- return fPath;
-}
-
+ return fPath;
+}
uint32_t ImageLoader::hash(const char* path)
{
@@ -395,9 +399,12 @@
}
void ImageLoader::applyInterposingToDyldCache(const LinkContext& context) {
-#if USES_CHAINED_BINDS
if (!context.dyldCache)
return;
+#if !__arm64e__ // until arm64e cache builder sets builtFromChainedFixups
+ if (!context.dyldCache->header.builtFromChainedFixups)
+ return;
+#endif
if (fgInterposingTuples.empty())
return;
// For each of the interposed addresses, see if any of them are in the shared cache. If so, find
@@ -413,37 +420,37 @@
dyld3::closure::ImageNum imageInCache = imageIndex+1;
if ( context.verboseInterposing )
dyld::log("dyld: interpose: Found shared cache image %d for 0x%08llx\n", imageInCache, (uint64_t)it->replacee);
- const dyld3::closure::Image* image = context.dyldCache->cachedDylibsImageArray()->imageForNum(imageInCache);
- image->forEachPatchableExport(^(uint32_t cacheOffsetOfImpl, const char* exportName) {
+ context.dyldCache->forEachPatchableExport(imageIndex, ^(uint32_t cacheOffsetOfImpl, const char* exportName) {
// Skip patching anything other than this symbol
if (cacheOffsetOfImpl != cacheOffsetOfReplacee)
return;
- if ( context.verboseInterposing )
+ if ( context.verboseInterposing ) {
+ const dyld3::closure::Image* image = context.dyldCache->cachedDylibsImageArray()->imageForNum(imageInCache);
dyld::log("dyld: interpose: Patching uses of symbol %s in shared cache binary at %s\n", exportName, image->path());
+ }
uintptr_t newLoc = it->replacement;
- image->forEachPatchableUseOfExport(cacheOffsetOfImpl, ^(dyld3::closure::Image::PatchableExport::PatchLocation patchLocation) {
+ context.dyldCache->forEachPatchableUseOfExport(imageIndex, cacheOffsetOfImpl, ^(dyld_cache_patchable_location patchLocation) {
uintptr_t* loc = (uintptr_t*)(cacheStart+patchLocation.cacheOffset);
#if __has_feature(ptrauth_calls)
if ( patchLocation.authenticated ) {
- dyld3::MachOLoaded::ChainedFixupPointerOnDisk fixupInfo;
- fixupInfo.authRebase.auth = true;
- fixupInfo.authRebase.addrDiv = patchLocation.usesAddressDiversity;
- fixupInfo.authRebase.diversity = patchLocation.discriminator;
- fixupInfo.authRebase.key = patchLocation.key;
- *loc = fixupInfo.signPointer(loc, newLoc + patchLocation.getAddend());
+ dyld3::MachOLoaded::ChainedFixupPointerOnDisk ptr = *(dyld3::MachOLoaded::ChainedFixupPointerOnDisk*)loc;
+ ptr.arm64e.authRebase.auth = true;
+ ptr.arm64e.authRebase.addrDiv = patchLocation.usesAddressDiversity;
+ ptr.arm64e.authRebase.diversity = patchLocation.discriminator;
+ ptr.arm64e.authRebase.key = patchLocation.key;
+ *loc = ptr.arm64e.signPointer(loc, newLoc + DyldSharedCache::getAddend(patchLocation));
if ( context.verboseInterposing )
dyld::log("dyld: interpose: *%p = %p (JOP: diversity 0x%04X, addr-div=%d, key=%s)\n",
- loc, (void*)*loc, patchLocation.discriminator, patchLocation.usesAddressDiversity, patchLocation.keyName());
+ loc, (void*)*loc, patchLocation.discriminator, patchLocation.usesAddressDiversity, DyldSharedCache::keyName(patchLocation));
return;
}
#endif
if ( context.verboseInterposing )
- dyld::log("dyld: interpose: *%p = 0x%0llX (dyld cache patch) to %s\n", loc, newLoc + patchLocation.getAddend(), exportName);
- *loc = newLoc + patchLocation.getAddend();
+ dyld::log("dyld: interpose: *%p = 0x%0llX (dyld cache patch) to %s\n", loc, newLoc + DyldSharedCache::getAddend(patchLocation), exportName);
+ *loc = newLoc + (uintptr_t)DyldSharedCache::getAddend(patchLocation);
});
});
}
-#endif
}
void ImageLoader::addDynamicInterposingTuples(const struct dyld_interpose_tuple array[], size_t count)
@@ -508,7 +515,7 @@
{
dyld3::ScopedTimer(DBG_DYLD_TIMING_APPLY_FIXUPS, 0, 0, 0);
t2 = mach_absolute_time();
- this->recursiveRebase(context);
+ this->recursiveRebaseWithAccounting(context);
context.notifyBatch(dyld_image_state_rebased, false);
t3 = mach_absolute_time();
@@ -521,20 +528,26 @@
t5 = mach_absolute_time();
}
- if ( !context.linkingMainExecutable )
- context.notifyBatch(dyld_image_state_bound, false);
- uint64_t t6 = mach_absolute_time();
-
- std::vector<DOFInfo> dofs;
- this->recursiveGetDOFSections(context, dofs);
- context.registerDOFs(dofs);
- uint64_t t7 = mach_absolute_time();
-
// interpose any dynamically loaded images
if ( !context.linkingMainExecutable && (fgInterposingTuples.size() != 0) ) {
dyld3::ScopedTimer timer(DBG_DYLD_TIMING_APPLY_INTERPOSING, 0, 0, 0);
this->recursiveApplyInterposing(context);
}
+
+ // now that all fixups are done, make __DATA_CONST segments read-only
+ if ( !context.linkingMainExecutable )
+ this->recursiveMakeDataReadOnly(context);
+
+ if ( !context.linkingMainExecutable )
+ context.notifyBatch(dyld_image_state_bound, false);
+ uint64_t t6 = mach_absolute_time();
+
+ if ( context.registerDOFs != NULL ) {
+ std::vector<DOFInfo> dofs;
+ this->recursiveGetDOFSections(context, dofs);
+ context.registerDOFs(dofs);
+ }
+ uint64_t t7 = mach_absolute_time();
// clear error strings
(*context.setErrorStrings)(0, NULL, NULL, NULL);
@@ -579,7 +592,7 @@
// Calling recursive init on all images in images list, building a new list of
// uninitialized upward dependencies.
for (uintptr_t i=0; i < images.count; ++i) {
- images.images[i]->recursiveInitialization(context, thisThread, images.images[i]->getPath(), timingInfo, ups);
+ images.imagesAndPaths[i].first->recursiveInitialization(context, thisThread, images.imagesAndPaths[i].second, timingInfo, ups);
}
// If any upward dependencies remain, init them.
if ( ups.count > 0 )
@@ -593,7 +606,7 @@
mach_port_t thisThread = mach_thread_self();
ImageLoader::UninitedUpwards up;
up.count = 1;
- up.images[0] = this;
+ up.imagesAndPaths[0] = { this, this->getPath() };
processInitializers(context, thisThread, timingInfo, up);
context.notifyBatch(dyld_image_state_initialized, false);
mach_port_deallocate(mach_task_self(), thisThread);
@@ -698,8 +711,6 @@
for(unsigned int i=0; i < fLibraryCount; ++i){
ImageLoader* dependentLib;
bool depLibReExported = false;
- bool depLibRequired = false;
- bool depLibCheckSumsMatch = false;
DependentLibraryInfo& requiredLibInfo = libraryInfos[i];
if ( preflightOnly && context.inSharedCache(requiredLibInfo.name) ) {
// <rdar://problem/5910137> dlopen_preflight() on image in shared cache leaves it loaded but not objc initialized
@@ -709,16 +720,10 @@
}
try {
unsigned cacheIndex;
- bool enforceIOSMac = false;
- #if __MAC_OS_X_VERSION_MIN_REQUIRED
- const dyld3::MachOFile* mf = (dyld3::MachOFile*)this->machHeader();
- if ( mf->supportsPlatform(dyld3::Platform::iOSMac) && !mf->supportsPlatform(dyld3::Platform::macOS) )
- enforceIOSMac = true;
- #endif
- dependentLib = context.loadLibrary(requiredLibInfo.name, true, this->getPath(), &thisRPaths, enforceIOSMac, cacheIndex);
+ dependentLib = context.loadLibrary(requiredLibInfo.name, true, this->getPath(), &thisRPaths, cacheIndex);
if ( dependentLib == this ) {
// found circular reference, perhaps DYLD_LIBARY_PATH is causing this rdar://problem/3684168
- dependentLib = context.loadLibrary(requiredLibInfo.name, false, NULL, NULL, enforceIOSMac, cacheIndex);
+ dependentLib = context.loadLibrary(requiredLibInfo.name, false, NULL, NULL, cacheIndex);
if ( dependentLib != this )
dyld::warn("DYLD_ setting caused circular dependency in %s\n", this->getPath());
}
@@ -730,8 +735,6 @@
dependentLib->fIsReferencedDownward = true;
}
LibraryInfo actualInfo = dependentLib->doGetLibraryInfo(requiredLibInfo.info);
- depLibRequired = requiredLibInfo.required;
- depLibCheckSumsMatch = ( actualInfo.checksum == requiredLibInfo.info.checksum );
depLibReExported = requiredLibInfo.reExported;
if ( ! depLibReExported ) {
// for pre-10.5 binaries that did not use LC_REEXPORT_DYLIB
@@ -820,6 +823,13 @@
}
}
+
+void ImageLoader::recursiveRebaseWithAccounting(const LinkContext& context)
+{
+ this->recursiveRebase(context);
+ vmAccountingSetSuspended(context, false);
+}
+
void ImageLoader::recursiveRebase(const LinkContext& context)
{
if ( fState < dyld_image_state_rebased ) {
@@ -873,6 +883,31 @@
}
}
}
+
+void ImageLoader::recursiveMakeDataReadOnly(const LinkContext& context)
+{
+ if ( ! fMadeReadOnly ) {
+ // break cycles
+ fMadeReadOnly = true;
+
+ try {
+ // handle lower level libraries first
+ for(unsigned int i=0; i < libraryCount(); ++i) {
+ ImageLoader* dependentImage = libImage(i);
+ if ( dependentImage != NULL )
+ dependentImage->recursiveMakeDataReadOnly(context);
+ }
+
+ // if this image has __DATA_CONST, make that segment read-only
+ makeDataReadOnly();
+ }
+ catch (const char* msg) {
+ fMadeReadOnly = false;
+ throw;
+ }
+ }
+}
+
void ImageLoader::recursiveBindWithAccounting(const LinkContext& context, bool forceLazysBound, bool neverUnload)
{
@@ -918,10 +953,11 @@
}
+
// These are mangled symbols for all the variants of operator new and delete
// which a main executable can define (non-weak) and override the
// weak-def implementation in the OS.
-static const char* sTreatAsWeak[] = {
+static const char* const sTreatAsWeak[] = {
"__Znwm", "__ZnwmRKSt9nothrow_t",
"__Znam", "__ZnamRKSt9nothrow_t",
"__ZdlPv", "__ZdlPvRKSt9nothrow_t", "__ZdlPvm",
@@ -931,7 +967,6 @@
"__ZdlPvSt11align_val_t", "__ZdlPvSt11align_val_tRKSt9nothrow_t", "__ZdlPvmSt11align_val_t",
"__ZdaPvSt11align_val_t", "__ZdaPvSt11align_val_tRKSt9nothrow_t", "__ZdaPvmSt11align_val_t"
};
-
void ImageLoader::weakBind(const LinkContext& context)
@@ -956,6 +991,69 @@
// don't need to do any coalescing if only one image has overrides, or all have already been done
if ( (countOfImagesWithWeakDefinitionsNotInSharedCache > 0) && (countNotYetWeakBound > 0) ) {
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // only do alternate algorithm for dlopen(). Use traditional algorithm for launch
+ if ( !context.linkingMainExecutable ) {
+ // for all images that need weak binding
+ for (int i=0; i < count; ++i) {
+ ImageLoader* imageBeingFixedUp = imagesNeedingCoalescing[i];
+ if ( imageBeingFixedUp->weakSymbolsBound(imageIndexes[i]) )
+ continue; // weak binding already completed
+ bool imageBeingFixedUpInCache = imageBeingFixedUp->inSharedCache();
+
+ if ( context.verboseWeakBind )
+ dyld::log("dyld: checking for weak symbols in %s\n", imageBeingFixedUp->getPath());
+ // for all symbols that need weak binding in this image
+ ImageLoader::CoalIterator coalIterator;
+ imageBeingFixedUp->initializeCoalIterator(coalIterator, i, imageIndexes[i]);
+ while ( !imageBeingFixedUp->incrementCoalIterator(coalIterator) ) {
+ const char* nameToCoalesce = coalIterator.symbolName;
+ uintptr_t targetAddr = 0;
+ const ImageLoader* targetImage;
+ // scan all images looking for definition to use
+ for (int j=0; j < count; ++j) {
+ const ImageLoader* anImage = imagesNeedingCoalescing[j];
+ bool anImageInCache = anImage->inSharedCache();
+ // <rdar://problem/47986398> Don't look at images in dyld cache because cache is
+ // already coalesced. Only images outside cache can potentially override something in cache.
+ if ( anImageInCache && imageBeingFixedUpInCache )
+ continue;
+
+ //dyld::log("looking for %s in %s\n", nameToCoalesce, anImage->getPath());
+ const ImageLoader* foundIn;
+ const Symbol* sym = anImage->findExportedSymbol(nameToCoalesce, false, &foundIn);
+ if ( sym != NULL ) {
+ if ( (foundIn->getExportedSymbolInfo(sym) & ImageLoader::kWeakDefinition) == 0 ) {
+ // found non-weak def, use it and stop looking
+ targetAddr = foundIn->getExportedSymbolAddress(sym, context);
+ targetImage = foundIn;
+ if ( context.verboseWeakBind )
+ dyld::log("dyld: found strong %s at 0x%lX in %s\n", nameToCoalesce, targetAddr, foundIn->getPath());
+ break;
+ }
+ else {
+ // found weak-def, only use if no weak found yet
+ if ( targetAddr == 0 ) {
+ targetAddr = foundIn->getExportedSymbolAddress(sym, context);
+ targetImage = foundIn;
+ if ( context.verboseWeakBind )
+ dyld::log("dyld: found weak %s at 0x%lX in %s\n", nameToCoalesce, targetAddr, foundIn->getPath());
+ }
+ }
+ }
+ }
+ if ( (targetAddr != 0) && (coalIterator.image != targetImage) ) {
+ coalIterator.image->updateUsesCoalIterator(coalIterator, targetAddr, (ImageLoader*)targetImage, 0, context);
+ if ( context.verboseWeakBind )
+ dyld::log("dyld: adjusting uses of %s in %s to use definition from %s\n", nameToCoalesce, coalIterator.image->getPath(), targetImage->getPath());
+ }
+ }
+ imageBeingFixedUp->setWeakSymbolsBound(imageIndexes[i]);
+ }
+ }
+ else
+#endif // __MAC_OS_X_VERSION_MIN_REQUIRED
+ {
// make symbol iterators for each
ImageLoader::CoalIterator iterators[count];
ImageLoader::CoalIterator* sortedIts[count];
@@ -1044,37 +1142,40 @@
}
}
-#if __arm64e__
for (int i=0; i < count; ++i) {
+ if ( imagesNeedingCoalescing[i]->weakSymbolsBound(imageIndexes[i]) )
+ continue; // skip images already processed
+
if ( imagesNeedingCoalescing[i]->usesChainedFixups() ) {
// during binding of references to weak-def symbols, the dyld cache was patched
// but if main executable has non-weak override of operator new or delete it needs is handled here
- if ( !imagesNeedingCoalescing[i]->weakSymbolsBound(imageIndexes[i]) ) {
- for (const char* weakSymbolName : sTreatAsWeak) {
- const ImageLoader* dummy;
- imagesNeedingCoalescing[i]->resolveWeak(context, weakSymbolName, true, false, &dummy);
- }
- }
- }
+ for (const char* weakSymbolName : sTreatAsWeak) {
+ const ImageLoader* dummy;
+ imagesNeedingCoalescing[i]->resolveWeak(context, weakSymbolName, true, false, &dummy);
+ }
+ }
+#if __arm64e__
else {
+ // support traditional arm64 app on an arm64e device
// look for weak def symbols in this image which may override the cache
ImageLoader::CoalIterator coaler;
imagesNeedingCoalescing[i]->initializeCoalIterator(coaler, i, 0);
imagesNeedingCoalescing[i]->incrementCoalIterator(coaler);
while ( !coaler.done ) {
- imagesNeedingCoalescing[i]->incrementCoalIterator(coaler);
const ImageLoader* dummy;
// a side effect of resolveWeak() is to patch cache
imagesNeedingCoalescing[i]->resolveWeak(context, coaler.symbolName, true, false, &dummy);
- }
- }
- }
+ imagesNeedingCoalescing[i]->incrementCoalIterator(coaler);
+ }
+ }
#endif
+ }
// mark all as having all weak symbols bound
for(int i=0; i < count; ++i) {
imagesNeedingCoalescing[i]->setWeakSymbolsBound(imageIndexes[i]);
}
+ }
}
uint64_t t2 = mach_absolute_time();
@@ -1120,13 +1221,16 @@
{
// try to set image's ivar fInitializerRecursiveLock to point to this lock_info
// keep trying until success (spin)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
while ( ! OSAtomicCompareAndSwapPtrBarrier(NULL, &rlock, (void**)&fInitializerRecursiveLock) ) {
// if fInitializerRecursiveLock already points to a different lock_info, if it is for
// the same thread we are on, the increment the lock count, otherwise continue to spin
if ( (fInitializerRecursiveLock != NULL) && (fInitializerRecursiveLock->thread == rlock.thread) )
break;
}
- ++(fInitializerRecursiveLock->count);
+#pragma clang diagnostic pop
+ ++(fInitializerRecursiveLock->count);
}
void ImageLoader::recursiveSpinUnLock()
@@ -1165,7 +1269,7 @@
if ( dependentImage != NULL ) {
// don't try to initialize stuff "above" me yet
if ( libIsUpward(i) ) {
- uninitUps.images[uninitUps.count] = dependentImage;
+ uninitUps.imagesAndPaths[uninitUps.count] = { dependentImage, libPath(i) };
uninitUps.count++;
}
else if ( dependentImage->fDepth >= fDepth ) {
@@ -1177,7 +1281,7 @@
// record termination order
if ( this->needsTermination() )
context.terminationRecorder(this);
-
+
// let objc know we are about to initialize this image
uint64_t t1 = mach_absolute_time();
fState = dyld_image_state_dependents_initialized;
@@ -1292,7 +1396,7 @@
printTime(" total time", totalTime, totalTime);
dyld::log(" total images loaded: %d (%u from dyld shared cache)\n", imageCount, fgImagesUsedFromSharedCache);
- dyld::log(" total segments mapped: %u, into %llu pages with %llu pages pre-fetched\n", fgTotalSegmentsMapped, fgTotalBytesMapped/4096, fgTotalBytesPreFetched/4096);
+ dyld::log(" total segments mapped: %u, into %llu pages\n", fgTotalSegmentsMapped, fgTotalBytesMapped/4096);
printTime(" total images loading time", fgTotalLoadLibrariesTime, totalTime);
printTime(" total load time in ObjC", fgTotalObjCSetupTime, totalTime);
printTime(" total debugger pause time", fgTotalDebuggerPausedTime, totalTime);