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--- dyld/dyld-551.3/src/ImageLoader.cpp
+++ dyld/dyld-635.2/src/ImageLoader.cpp
@@ -34,7 +34,10 @@
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/mount.h>
+#include <sys/sysctl.h>
#include <libkern/OSAtomic.h>
+
+#include "Tracing.h"
#include "ImageLoader.h"
@@ -368,6 +371,7 @@
// this is called by initializeMainExecutable() to interpose on the initial set of images
void ImageLoader::applyInterposing(const LinkContext& context)
{
+ dyld3::ScopedTimer timer(DBG_DYLD_TIMING_APPLY_INTERPOSING, 0, 0, 0);
if ( fgInterposingTuples.size() != 0 )
this->recursiveApplyInterposing(context);
}
@@ -388,6 +392,58 @@
}
}
return address;
+}
+
+void ImageLoader::applyInterposingToDyldCache(const LinkContext& context) {
+#if USES_CHAINED_BINDS
+ if (!context.dyldCache)
+ return;
+ if (fgInterposingTuples.empty())
+ return;
+ // For each of the interposed addresses, see if any of them are in the shared cache. If so, find
+ // that image and apply its patch table to all uses.
+ uintptr_t cacheStart = (uintptr_t)context.dyldCache;
+ for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ if ( context.verboseInterposing )
+ dyld::log("dyld: interpose: Trying to interpose address 0x%08llx\n", (uint64_t)it->replacee);
+ uint32_t imageIndex;
+ uint32_t cacheOffsetOfReplacee = (uint32_t)(it->replacee - cacheStart);
+ if (!context.dyldCache->addressInText(cacheOffsetOfReplacee, &imageIndex))
+ continue;
+ 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) {
+ // Skip patching anything other than this symbol
+ if (cacheOffsetOfImpl != cacheOffsetOfReplacee)
+ return;
+ if ( context.verboseInterposing )
+ 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) {
+ 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());
+ 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());
+ 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();
+ });
+ });
+ }
+#endif
}
void ImageLoader::addDynamicInterposingTuples(const struct dyld_interpose_tuple array[], size_t count)
@@ -408,6 +464,26 @@
}
}
+// <rdar://problem/29099600> dyld should tell the kernel when it is doing root fix-ups
+void ImageLoader::vmAccountingSetSuspended(const LinkContext& context, bool suspend)
+{
+#if __arm__ || __arm64__
+ static bool sVmAccountingSuspended = false;
+ if ( suspend == sVmAccountingSuspended )
+ return;
+ if ( context.verboseBind )
+ dyld::log("set vm.footprint_suspend=%d\n", suspend);
+ int newValue = suspend ? 1 : 0;
+ int oldValue = 0;
+ size_t newlen = sizeof(newValue);
+ size_t oldlen = sizeof(oldValue);
+ int ret = sysctlbyname("vm.footprint_suspend", &oldValue, &oldlen, &newValue, newlen);
+ if ( context.verboseBind && (ret != 0) )
+ dyld::log("vm.footprint_suspend => %d, errno=%d\n", ret, errno);
+ sVmAccountingSuspended = suspend;
+#endif
+}
+
void ImageLoader::link(const LinkContext& context, bool forceLazysBound, bool preflightOnly, bool neverUnload, const RPathChain& loaderRPaths, const char* imagePath)
{
@@ -423,24 +499,30 @@
// we only do the loading step for preflights
if ( preflightOnly )
return;
-
+
uint64_t t1 = mach_absolute_time();
context.clearAllDepths();
this->recursiveUpdateDepth(context.imageCount());
- uint64_t t2 = mach_absolute_time();
- this->recursiveRebase(context);
- context.notifyBatch(dyld_image_state_rebased, false);
-
- uint64_t t3 = mach_absolute_time();
- this->recursiveBind(context, forceLazysBound, neverUnload);
-
- uint64_t t4 = mach_absolute_time();
- if ( !context.linkingMainExecutable )
- this->weakBind(context);
- uint64_t t5 = mach_absolute_time();
-
- context.notifyBatch(dyld_image_state_bound, false);
+ __block uint64_t t2, t3, t4, t5;
+ {
+ dyld3::ScopedTimer(DBG_DYLD_TIMING_APPLY_FIXUPS, 0, 0, 0);
+ t2 = mach_absolute_time();
+ this->recursiveRebase(context);
+ context.notifyBatch(dyld_image_state_rebased, false);
+
+ t3 = mach_absolute_time();
+ if ( !context.linkingMainExecutable )
+ this->recursiveBindWithAccounting(context, forceLazysBound, neverUnload);
+
+ t4 = mach_absolute_time();
+ if ( !context.linkingMainExecutable )
+ this->weakBind(context);
+ t5 = mach_absolute_time();
+ }
+
+ if ( !context.linkingMainExecutable )
+ context.notifyBatch(dyld_image_state_bound, false);
uint64_t t6 = mach_absolute_time();
std::vector<DOFInfo> dofs;
@@ -450,9 +532,10 @@
// 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);
}
-
+
// clear error strings
(*context.setErrorStrings)(0, NULL, NULL, NULL);
@@ -626,10 +709,16 @@
}
try {
unsigned cacheIndex;
- dependentLib = context.loadLibrary(requiredLibInfo.name, true, this->getPath(), &thisRPaths, 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);
if ( dependentLib == this ) {
// found circular reference, perhaps DYLD_LIBARY_PATH is causing this rdar://problem/3684168
- dependentLib = context.loadLibrary(requiredLibInfo.name, false, NULL, NULL, cacheIndex);
+ dependentLib = context.loadLibrary(requiredLibInfo.name, false, NULL, NULL, enforceIOSMac, cacheIndex);
if ( dependentLib != this )
dyld::warn("DYLD_ setting caused circular dependency in %s\n", this->getPath());
}
@@ -650,7 +739,8 @@
}
// check found library version is compatible
// <rdar://problem/89200806> 0xFFFFFFFF is wildcard that matches any version
- if ( (requiredLibInfo.info.minVersion != 0xFFFFFFFF) && (actualInfo.minVersion < requiredLibInfo.info.minVersion) ) {
+ if ( (requiredLibInfo.info.minVersion != 0xFFFFFFFF) && (actualInfo.minVersion < requiredLibInfo.info.minVersion)
+ && ((dyld3::MachOFile*)(dependentLib->machHeader()))->enforceCompatVersion() ) {
// record values for possible use by CrashReporter or Finder
dyld::throwf("Incompatible library version: %s requires version %d.%d.%d or later, but %s provides version %d.%d.%d",
this->getShortName(), requiredLibInfo.info.minVersion >> 16, (requiredLibInfo.info.minVersion >> 8) & 0xff, requiredLibInfo.info.minVersion & 0xff,
@@ -784,7 +874,11 @@
}
}
-
+void ImageLoader::recursiveBindWithAccounting(const LinkContext& context, bool forceLazysBound, bool neverUnload)
+{
+ this->recursiveBind(context, forceLazysBound, neverUnload);
+ vmAccountingSetSuspended(context, false);
+}
void ImageLoader::recursiveBind(const LinkContext& context, bool forceLazysBound, bool neverUnload)
{
@@ -822,6 +916,23 @@
}
}
}
+
+
+// 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[] = {
+ "__Znwm", "__ZnwmRKSt9nothrow_t",
+ "__Znam", "__ZnamRKSt9nothrow_t",
+ "__ZdlPv", "__ZdlPvRKSt9nothrow_t", "__ZdlPvm",
+ "__ZdaPv", "__ZdaPvRKSt9nothrow_t", "__ZdaPvm",
+ "__ZnwmSt11align_val_t", "__ZnwmSt11align_val_tRKSt9nothrow_t",
+ "__ZnamSt11align_val_t", "__ZnamSt11align_val_tRKSt9nothrow_t",
+ "__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)
{
@@ -929,15 +1040,43 @@
}
}
}
-
- }
- }
-
+
+ }
+ }
+
+#if __arm64e__
+ for (int i=0; i < count; ++i) {
+ 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);
+ }
+ }
+ }
+ else {
+ // 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);
+ }
+ }
+ }
+#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();
fgTotalWeakBindTime += t2 - t1;
@@ -1075,9 +1214,9 @@
static uint64_t sUnitsPerSecond = 0;
if ( sUnitsPerSecond == 0 ) {
struct mach_timebase_info timeBaseInfo;
- if ( mach_timebase_info(&timeBaseInfo) == KERN_SUCCESS ) {
- sUnitsPerSecond = 1000000000ULL * timeBaseInfo.denom / timeBaseInfo.numer;
- }
+ if ( mach_timebase_info(&timeBaseInfo) != KERN_SUCCESS )
+ return;
+ sUnitsPerSecond = 1000000000ULL * timeBaseInfo.denom / timeBaseInfo.numer;
}
if ( partTime < sUnitsPerSecond ) {
uint32_t milliSecondsTimesHundred = (uint32_t)((partTime*100000)/sUnitsPerSecond);
@@ -1333,7 +1472,7 @@
} while (byte & 0x80);
// sign extend negative numbers
if ( (byte & 0x40) != 0 )
- result |= (-1LL) << bit;
+ result |= (~0ULL) << bit;
return (intptr_t)result;
}