SmallSet<GlobalValue*, 32> DynInitGlobals;
};
+static int MappingScale() {
+ return ClMappingScale ? ClMappingScale : kDefaultShadowScale;
+}
+
+static size_t RedzoneSize() {
+ // Redzone used for stack and globals is at least 32 bytes.
+ // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively.
+ return std::max(32U, 1U << MappingScale());
+}
/// AddressSanitizer: instrument the code in module to find memory bugs.
struct AddressSanitizer : public FunctionPass {
bool poisonStackInFunction(Function &F);
virtual bool doInitialization(Module &M);
virtual bool doFinalization(Module &M);
- bool insertGlobalRedzones(Module &M);
static char ID; // Pass identification, replacement for typeid
private:
return SizeInBytes;
}
uint64_t getAlignedSize(uint64_t SizeInBytes) {
- return ((SizeInBytes + RedzoneSize - 1)
- / RedzoneSize) * RedzoneSize;
+ size_t RZ = RedzoneSize();
+ return ((SizeInBytes + RZ - 1) / RZ) * RZ;
}
uint64_t getAlignedAllocaSize(AllocaInst *AI) {
uint64_t SizeInBytes = getAllocaSizeInBytes(AI);
return getAlignedSize(SizeInBytes);
}
- Function *checkInterfaceFunction(Constant *FuncOrBitcast);
bool ShouldInstrumentGlobal(GlobalVariable *G);
void PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB,
Value *ShadowBase, bool DoPoison);
LLVMContext *C;
DataLayout *TD;
uint64_t MappingOffset;
- int MappingScale;
- size_t RedzoneSize;
int LongSize;
Type *IntptrTy;
Type *IntptrPtrTy;
Function *AsanInitFunction;
Function *AsanStackMallocFunc, *AsanStackFreeFunc;
Function *AsanHandleNoReturnFunc;
- Instruction *CtorInsertBefore;
OwningPtr<BlackList> BL;
// This array is indexed by AccessIsWrite and log2(AccessSize).
Function *AsanErrorCallback[2][kNumberOfAccessSizes];
SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals;
};
+// FIXME: inherit this from ModulePass and actually use it as a ModulePass.
+class AddressSanitizerCreateGlobalRedzonesPass {
+ public:
+ bool runOnModule(Module &M, DataLayout *TD);
+ private:
+ bool ShouldInstrumentGlobal(GlobalVariable *G);
+ void createInitializerPoisonCalls(Module &M, Value *FirstAddr,
+ Value *LastAddr);
+
+ static char ID; // Pass identification, replacement for typeid
+ OwningPtr<BlackList> BL;
+ SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals;
+ Type *IntptrTy;
+ LLVMContext *C;
+};
+
} // namespace
char AddressSanitizer::ID = 0;
Value *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) {
// Shadow >> scale
- Shadow = IRB.CreateLShr(Shadow, MappingScale);
+ Shadow = IRB.CreateLShr(Shadow, MappingScale());
if (MappingOffset == 0)
return Shadow;
// (Shadow >> scale) | offset
// function of AddressSanitizer. If the instrumented module defines a function
// with the same name, their prototypes must match, otherwise
// getOrInsertFunction returns a bitcast.
-Function *AddressSanitizer::checkInterfaceFunction(Constant *FuncOrBitcast) {
+static Function *checkInterfaceFunction(Constant *FuncOrBitcast) {
if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast);
FuncOrBitcast->dump();
report_fatal_error("trying to redefine an AddressSanitizer "
Value *AddressSanitizer::createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong,
Value *ShadowValue,
uint32_t TypeSize) {
- size_t Granularity = 1 << MappingScale;
+ size_t Granularity = 1 << MappingScale();
// Addr & (Granularity - 1)
Value *LastAccessedByte = IRB.CreateAnd(
AddrLong, ConstantInt::get(IntptrTy, Granularity - 1));
Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy);
Type *ShadowTy = IntegerType::get(
- *C, std::max(8U, TypeSize >> MappingScale));
+ *C, std::max(8U, TypeSize >> MappingScale()));
Type *ShadowPtrTy = PointerType::get(ShadowTy, 0);
Value *ShadowPtr = memToShadow(AddrLong, IRB);
Value *CmpVal = Constant::getNullValue(ShadowTy);
Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal);
size_t AccessSizeIndex = TypeSizeToSizeIndex(TypeSize);
- size_t Granularity = 1 << MappingScale;
+ size_t Granularity = 1 << MappingScale();
TerminatorInst *CrashTerm = 0;
if (ClAlwaysSlowPath || (TypeSize < 8 * Granularity)) {
Crash->setDebugLoc(OrigIns->getDebugLoc());
}
-void AddressSanitizer::createInitializerPoisonCalls(Module &M,
- Value *FirstAddr,
- Value *LastAddr) {
+void AddressSanitizerCreateGlobalRedzonesPass::createInitializerPoisonCalls(
+ Module &M, Value *FirstAddr, Value *LastAddr) {
// We do all of our poisoning and unpoisoning within _GLOBAL__I_a.
Function *GlobalInit = M.getFunction("_GLOBAL__I_a");
// If that function is not present, this TU contains no globals, or they have
}
}
-bool AddressSanitizer::ShouldInstrumentGlobal(GlobalVariable *G) {
+bool AddressSanitizerCreateGlobalRedzonesPass::ShouldInstrumentGlobal(
+ GlobalVariable *G) {
Type *Ty = cast<PointerType>(G->getType())->getElementType();
DEBUG(dbgs() << "GLOBAL: " << *G << "\n");
if (G->isThreadLocal())
return false;
// For now, just ignore this Alloca if the alignment is large.
- if (G->getAlignment() > RedzoneSize) return false;
+ if (G->getAlignment() > RedzoneSize()) return false;
// Ignore all the globals with the names starting with "\01L_OBJC_".
// Many of those are put into the .cstring section. The linker compresses
// This function replaces all global variables with new variables that have
// trailing redzones. It also creates a function that poisons
// redzones and inserts this function into llvm.global_ctors.
-bool AddressSanitizer::insertGlobalRedzones(Module &M) {
+bool AddressSanitizerCreateGlobalRedzonesPass::runOnModule(Module &M,
+ DataLayout *TD) {
+ BL.reset(new BlackList(ClBlackListFile));
+ DynamicallyInitializedGlobals.Init(M);
+ C = &(M.getContext());
+ IntptrTy = Type::getIntNTy(*C, TD->getPointerSizeInBits());
+
SmallVector<GlobalVariable *, 16> GlobalsToChange;
for (Module::GlobalListType::iterator G = M.global_begin(),
IntptrTy, NULL);
SmallVector<Constant *, 16> Initializers(n), DynamicInit;
- IRBuilder<> IRB(CtorInsertBefore);
+
+ Function *CtorFunc = M.getFunction(kAsanModuleCtorName);
+ assert(CtorFunc);
+ IRBuilder<> IRB(CtorFunc->getEntryBlock().getTerminator());
// The addresses of the first and last dynamically initialized globals in
// this TU. Used in initialization order checking.
PointerType *PtrTy = cast<PointerType>(G->getType());
Type *Ty = PtrTy->getElementType();
uint64_t SizeInBytes = TD->getTypeAllocSize(Ty);
- uint64_t RightRedzoneSize = RedzoneSize +
- (RedzoneSize - (SizeInBytes % RedzoneSize));
+ size_t RZ = RedzoneSize();
+ uint64_t RightRedzoneSize = RZ + (RZ - (SizeInBytes % RZ));
Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize);
// Determine whether this global should be poisoned in initialization.
bool GlobalHasDynamicInitializer =
M, NewTy, G->isConstant(), G->getLinkage(),
NewInitializer, "", G, G->getThreadLocalMode());
NewGlobal->copyAttributesFrom(G);
- NewGlobal->setAlignment(RedzoneSize);
+ NewGlobal->setAlignment(RZ);
Value *Indices2[2];
Indices2[0] = IRB.getInt32(0);
FunctionType::get(Type::getVoidTy(*C), false),
GlobalValue::InternalLinkage, kAsanModuleCtorName, &M);
BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction);
- CtorInsertBefore = ReturnInst::Create(*C, AsanCtorBB);
-
// call __asan_init in the module ctor.
- IRBuilder<> IRB(CtorInsertBefore);
+ IRBuilder<> IRB(ReturnInst::Create(*C, AsanCtorBB));
AsanInitFunction = checkInterfaceFunction(
M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL));
AsanInitFunction->setLinkage(Function::ExternalLinkage);
MappingOffset = 1ULL << ClMappingOffsetLog;
}
}
- MappingScale = kDefaultShadowScale;
- if (ClMappingScale) {
- MappingScale = ClMappingScale;
- }
- // Redzone used for stack and globals is at least 32 bytes.
- // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively.
- RedzoneSize = std::max(32, (int)(1 << MappingScale));
if (ClMappingOffsetLog >= 0) {
if (ClMappingScale) {
GlobalValue *asan_mapping_scale =
new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage,
- ConstantInt::get(IntptrTy, MappingScale),
+ ConstantInt::get(IntptrTy, MappingScale()),
kAsanMappingScaleName);
// Read the global, otherwise it may be optimized away.
IRB.CreateLoad(asan_mapping_scale, true);
bool AddressSanitizer::doFinalization(Module &M) {
// We transform the globals at the very end so that the optimization analysis
// works on the original globals.
- if (ClGlobals)
- return insertGlobalRedzones(M);
+ if (ClGlobals) {
+ // FIXME: instead of doFinalization, run this as a true ModulePass.
+ AddressSanitizerCreateGlobalRedzonesPass Pass;
+ return Pass.runOnModule(M, TD);
+ }
return false;
}
static void PoisonShadowPartialRightRedzone(uint8_t *Shadow,
size_t Size,
- size_t RedzoneSize,
+ size_t RZSize,
size_t ShadowGranularity,
uint8_t Magic) {
- for (size_t i = 0; i < RedzoneSize;
+ for (size_t i = 0; i < RZSize;
i+= ShadowGranularity, Shadow++) {
if (i + ShadowGranularity <= Size) {
*Shadow = 0; // fully addressable
void AddressSanitizer::PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec,
IRBuilder<> IRB,
Value *ShadowBase, bool DoPoison) {
- size_t ShadowRZSize = RedzoneSize >> MappingScale;
+ size_t ShadowRZSize = RedzoneSize() >> MappingScale();
assert(ShadowRZSize >= 1 && ShadowRZSize <= 4);
Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8);
Type *RZPtrTy = PointerType::get(RZTy, 0);
IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy));
// poison all other red zones.
- uint64_t Pos = RedzoneSize;
+ uint64_t Pos = RedzoneSize();
for (size_t i = 0, n = AllocaVec.size(); i < n; i++) {
AllocaInst *AI = AllocaVec[i];
uint64_t SizeInBytes = getAllocaSizeInBytes(AI);
uint64_t AlignedSize = getAlignedAllocaSize(AI);
- assert(AlignedSize - SizeInBytes < RedzoneSize);
+ assert(AlignedSize - SizeInBytes < RedzoneSize());
Value *Ptr = NULL;
Pos += AlignedSize;
// Poison the partial redzone at right
Ptr = IRB.CreateAdd(
ShadowBase, ConstantInt::get(IntptrTy,
- (Pos >> MappingScale) - ShadowRZSize));
- size_t AddressableBytes = RedzoneSize - (AlignedSize - SizeInBytes);
+ (Pos >> MappingScale()) - ShadowRZSize));
+ size_t AddressableBytes = RedzoneSize() - (AlignedSize - SizeInBytes);
uint32_t Poison = 0;
if (DoPoison) {
PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes,
- RedzoneSize,
- 1ULL << MappingScale,
+ RedzoneSize(),
+ 1ULL << MappingScale(),
kAsanStackPartialRedzoneMagic);
}
Value *PartialPoison = ConstantInt::get(RZTy, Poison);
// Poison the full redzone at right.
Ptr = IRB.CreateAdd(ShadowBase,
- ConstantInt::get(IntptrTy, Pos >> MappingScale));
+ ConstantInt::get(IntptrTy, Pos >> MappingScale()));
Value *Poison = i == AllocaVec.size() - 1 ? PoisonRight : PoisonMid;
IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy));
- Pos += RedzoneSize;
+ Pos += RedzoneSize();
}
}
if (AI->isArrayAllocation()) continue;
if (!AI->isStaticAlloca()) continue;
if (!AI->getAllocatedType()->isSized()) continue;
- if (AI->getAlignment() > RedzoneSize) continue;
+ if (AI->getAlignment() > RedzoneSize()) continue;
AllocaVec.push_back(AI);
uint64_t AlignedSize = getAlignedAllocaSize(AI);
TotalSize += AlignedSize;
if (AllocaVec.empty()) return false;
- uint64_t LocalStackSize = TotalSize + (AllocaVec.size() + 1) * RedzoneSize;
+ uint64_t LocalStackSize = TotalSize + (AllocaVec.size() + 1) * RedzoneSize();
bool DoStackMalloc = ClUseAfterReturn
&& LocalStackSize <= kMaxStackMallocSize;
Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize);
AllocaInst *MyAlloca =
new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore);
- MyAlloca->setAlignment(RedzoneSize);
+ MyAlloca->setAlignment(RedzoneSize());
assert(MyAlloca->isStaticAlloca());
Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy);
Value *LocalStackBase = OrigStackBase;
raw_svector_ostream StackDescription(StackDescriptionStorage);
StackDescription << F.getName() << " " << AllocaVec.size() << " ";
- uint64_t Pos = RedzoneSize;
+ uint64_t Pos = RedzoneSize();
// Replace Alloca instructions with base+offset.
for (size_t i = 0, n = AllocaVec.size(); i < n; i++) {
AllocaInst *AI = AllocaVec[i];
StackDescription << Pos << " " << SizeInBytes << " "
<< Name.size() << " " << Name << " ";
uint64_t AlignedSize = getAlignedAllocaSize(AI);
- assert((AlignedSize % RedzoneSize) == 0);
+ assert((AlignedSize % RedzoneSize()) == 0);
AI->replaceAllUsesWith(
IRB.CreateIntToPtr(
IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)),
AI->getType()));
- Pos += AlignedSize + RedzoneSize;
+ Pos += AlignedSize + RedzoneSize();
}
assert(Pos == LocalStackSize);
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