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[sanitizer-coverage/libFuzzer] make the guards for trace-pc 32-bit; create one array of guards per function, instead of one guard per BB. reorganize the code so that trace-pc-guard does not create unneeded globals
llvm-svn: 282735
This commit is contained in:
Kostya Serebryany
parent
ba72b95f7b
commit
a9b0dd0e51
@ -334,7 +334,7 @@ on every edge:
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if (guard_variable)
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__sanitizer_cov_trace_pc_guard(&guard_variable)
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Every edge will have its own `guard_variable` (uintptr_t).
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Every edge will have its own `guard_variable` (uint32_t).
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The compler will also insert a module constructor that will call
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@ -342,7 +342,7 @@ The compler will also insert a module constructor that will call
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// The guards are [start, stop).
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// This function may be called multiple times with the same values of start/stop.
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__sanitizer_cov_trace_pc_guard_init(uintptr_t *start, uintptr_t *stop);
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__sanitizer_cov_trace_pc_guard_init(uint32_t_t *start, uint32_t *stop);
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Similarly to `trace-pc,indirect-calls`, with `trace-pc-guards,indirect-calls`
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``__sanitizer_cov_trace_pc_indirect(void *callee)`` will be inserted on every indirect call.
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@ -500,7 +500,8 @@ void Fuzzer::ExecuteCallback(const uint8_t *Data, size_t Size) {
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UnitStartTime = system_clock::now();
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ResetCounters(); // Reset coverage right before the callback.
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TPC.ResetMaps();
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TPC.ResetGuards();
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if (Options.UseCounters)
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TPC.ResetGuards();
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int Res = CB(DataCopy, Size);
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UnitStopTime = system_clock::now();
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(void)Res;
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@ -20,8 +20,8 @@ namespace fuzzer {
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TracePC TPC;
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void TracePC::HandleTrace(uintptr_t *Guard, uintptr_t PC) {
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uintptr_t Idx = *Guard;
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void TracePC::HandleTrace(uint32_t *Guard, uintptr_t PC) {
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uint32_t Idx = *Guard;
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if (!Idx) return;
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uint8_t *CounterPtr = &Counters[Idx % kNumCounters];
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uint8_t Counter = *CounterPtr;
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@ -43,10 +43,10 @@ void TracePC::HandleTrace(uintptr_t *Guard, uintptr_t PC) {
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}
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}
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void TracePC::HandleInit(uintptr_t *Start, uintptr_t *Stop) {
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void TracePC::HandleInit(uint32_t *Start, uint32_t *Stop) {
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if (Start == Stop || *Start) return;
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assert(NumModules < sizeof(Modules) / sizeof(Modules[0]));
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for (uintptr_t *P = Start; P < Stop; P++)
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for (uint32_t *P = Start; P < Stop; P++)
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*P = ++NumGuards;
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Modules[NumModules].Start = Start;
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Modules[NumModules].Stop = Stop;
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@ -61,9 +61,9 @@ void TracePC::PrintModuleInfo() {
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}
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void TracePC::ResetGuards() {
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uintptr_t N = 0;
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uint32_t N = 0;
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for (size_t M = 0; M < NumModules; M++)
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for (uintptr_t *X = Modules[M].Start; X < Modules[M].Stop; X++)
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for (uint32_t *X = Modules[M].Start; X < Modules[M].Stop; X++)
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*X = ++N;
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assert(N == NumGuards);
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}
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@ -138,13 +138,13 @@ void TracePC::PrintFeatureSet() {
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extern "C" {
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__attribute__((visibility("default")))
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void __sanitizer_cov_trace_pc_guard(uintptr_t *Guard) {
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void __sanitizer_cov_trace_pc_guard(uint32_t *Guard) {
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uintptr_t PC = (uintptr_t)__builtin_return_address(0);
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fuzzer::TPC.HandleTrace(Guard, PC);
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}
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__attribute__((visibility("default")))
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void __sanitizer_cov_trace_pc_guard_init(uintptr_t *Start, uintptr_t *Stop) {
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void __sanitizer_cov_trace_pc_guard_init(uint32_t *Start, uint32_t *Stop) {
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fuzzer::TPC.HandleInit(Start, Stop);
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}
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@ -19,8 +19,8 @@ namespace fuzzer {
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class TracePC {
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public:
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void HandleTrace(uintptr_t *guard, uintptr_t PC);
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void HandleInit(uintptr_t *start, uintptr_t *stop);
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void HandleTrace(uint32_t *guard, uintptr_t PC);
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void HandleInit(uint32_t *start, uint32_t *stop);
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void HandleCallerCallee(uintptr_t Caller, uintptr_t Callee);
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void HandleValueProfile(size_t Value) { ValueProfileMap.AddValue(Value); }
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size_t GetTotalPCCoverage() { return TotalPCCoverage; }
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@ -71,7 +71,7 @@ private:
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}
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struct Module {
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uintptr_t *Start, *Stop;
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uint32_t *Start, *Stop;
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};
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Module Modules[4096];
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@ -207,8 +207,10 @@ private:
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void InjectTraceForSwitch(Function &F,
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ArrayRef<Instruction *> SwitchTraceTargets);
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bool InjectCoverage(Function &F, ArrayRef<BasicBlock *> AllBlocks);
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void CreateFunctionGuardArray(size_t NumGuards, Function &F);
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void SetNoSanitizeMetadata(Instruction *I);
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void InjectCoverageAtBlock(Function &F, BasicBlock &BB, bool UseCalls);
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void InjectCoverageAtBlock(Function &F, BasicBlock &BB, size_t Idx,
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bool UseCalls);
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unsigned NumberOfInstrumentedBlocks() {
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return SanCovFunction->getNumUses() +
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SanCovWithCheckFunction->getNumUses() + SanCovTraceBB->getNumUses() +
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@ -223,12 +225,13 @@ private:
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Function *SanCovTraceGepFunction;
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Function *SanCovTraceSwitchFunction;
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InlineAsm *EmptyAsm;
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Type *IntptrTy, *IntptrPtrTy, *Int64Ty, *Int64PtrTy;
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Type *IntptrTy, *IntptrPtrTy, *Int64Ty, *Int64PtrTy, *Int32Ty, *Int32PtrTy;
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Module *CurModule;
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LLVMContext *C;
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const DataLayout *DL;
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GlobalVariable *GuardArray;
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GlobalVariable *FunctionGuardArray; // for trace-pc-guard.
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GlobalVariable *EightBitCounterArray;
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bool HasSancovGuardsSection;
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@ -249,9 +252,10 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
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Type *VoidTy = Type::getVoidTy(*C);
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IRBuilder<> IRB(*C);
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Type *Int8PtrTy = PointerType::getUnqual(IRB.getInt8Ty());
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Type *Int32PtrTy = PointerType::getUnqual(IRB.getInt32Ty());
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Int64PtrTy = PointerType::getUnqual(IRB.getInt64Ty());
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Int32PtrTy = PointerType::getUnqual(IRB.getInt32Ty());
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Int64Ty = IRB.getInt64Ty();
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Int32Ty = IRB.getInt32Ty();
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SanCovFunction = checkSanitizerInterfaceFunction(
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M.getOrInsertFunction(SanCovName, VoidTy, Int32PtrTy, nullptr));
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@ -296,7 +300,7 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
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SanCovTracePC = checkSanitizerInterfaceFunction(
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M.getOrInsertFunction(SanCovTracePCName, VoidTy, nullptr));
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SanCovTracePCGuard = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
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SanCovTracePCGuardName, VoidTy, IntptrPtrTy, nullptr));
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SanCovTracePCGuardName, VoidTy, Int32PtrTy, nullptr));
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SanCovTraceEnter = checkSanitizerInterfaceFunction(
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M.getOrInsertFunction(SanCovTraceEnterName, VoidTy, Int32PtrTy, nullptr));
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SanCovTraceBB = checkSanitizerInterfaceFunction(
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@ -307,9 +311,10 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
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Type *Int32Ty = IRB.getInt32Ty();
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Type *Int8Ty = IRB.getInt8Ty();
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GuardArray =
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new GlobalVariable(M, Int32Ty, false, GlobalValue::ExternalLinkage,
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nullptr, "__sancov_gen_cov_tmp");
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if (!Options.TracePCGuard)
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GuardArray =
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new GlobalVariable(M, Int32Ty, false, GlobalValue::ExternalLinkage,
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nullptr, "__sancov_gen_cov_tmp");
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if (Options.Use8bitCounters)
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EightBitCounterArray =
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new GlobalVariable(M, Int8Ty, false, GlobalVariable::ExternalLinkage,
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@ -320,17 +325,20 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
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auto N = NumberOfInstrumentedBlocks();
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// Now we know how many elements we need. Create an array of guards
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// with one extra element at the beginning for the size.
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Type *Int32ArrayNTy = ArrayType::get(Int32Ty, N + 1);
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GlobalVariable *RealGuardArray = new GlobalVariable(
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M, Int32ArrayNTy, false, GlobalValue::PrivateLinkage,
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Constant::getNullValue(Int32ArrayNTy), "__sancov_gen_cov");
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GlobalVariable *RealGuardArray = nullptr;
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if (!Options.TracePCGuard) {
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// Now we know how many elements we need. Create an array of guards
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// with one extra element at the beginning for the size.
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Type *Int32ArrayNTy = ArrayType::get(Int32Ty, N + 1);
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RealGuardArray = new GlobalVariable(
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M, Int32ArrayNTy, false, GlobalValue::PrivateLinkage,
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Constant::getNullValue(Int32ArrayNTy), "__sancov_gen_cov");
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// Replace the dummy array with the real one.
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GuardArray->replaceAllUsesWith(
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IRB.CreatePointerCast(RealGuardArray, Int32PtrTy));
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GuardArray->eraseFromParent();
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// Replace the dummy array with the real one.
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GuardArray->replaceAllUsesWith(
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IRB.CreatePointerCast(RealGuardArray, Int32PtrTy));
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GuardArray->eraseFromParent();
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}
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GlobalVariable *RealEightBitCounterArray;
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if (Options.Use8bitCounters) {
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@ -359,16 +367,16 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
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GlobalVariable *Bounds[2];
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const char *Prefix[2] = {"__start_", "__stop_"};
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for (int i = 0; i < 2; i++) {
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Bounds[i] = new GlobalVariable(M, IntptrPtrTy, false,
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Bounds[i] = new GlobalVariable(M, Int32PtrTy, false,
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GlobalVariable::ExternalLinkage, nullptr,
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Prefix[i] + SectionName);
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Bounds[i]->setVisibility(GlobalValue::HiddenVisibility);
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}
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std::tie(CtorFunc, std::ignore) = createSanitizerCtorAndInitFunctions(
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M, SanCovModuleCtorName, SanCovTracePCGuardInitName,
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{IntptrPtrTy, IntptrPtrTy},
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{IRB.CreatePointerCast(Bounds[0], IntptrPtrTy),
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IRB.CreatePointerCast(Bounds[1], IntptrPtrTy)});
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{Int32PtrTy, Int32PtrTy},
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{IRB.CreatePointerCast(Bounds[0], Int32PtrTy),
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IRB.CreatePointerCast(Bounds[1], Int32PtrTy)});
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appendToGlobalCtors(M, CtorFunc, SanCtorAndDtorPriority);
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}
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@ -419,6 +427,14 @@ static bool isFullPostDominator(const BasicBlock *BB,
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static bool shouldInstrumentBlock(const Function& F, const BasicBlock *BB, const DominatorTree *DT,
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const PostDominatorTree *PDT) {
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// Don't insert coverage for unreachable blocks: we will never call
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// __sanitizer_cov() for them, so counting them in
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// NumberOfInstrumentedBlocks() might complicate calculation of code coverage
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// percentage. Also, unreachable instructions frequently have no debug
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// locations.
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if (isa<UnreachableInst>(BB->getTerminator()))
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return false;
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if (!ClPruneBlocks || &F.getEntryBlock() == BB)
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return true;
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@ -486,19 +502,34 @@ bool SanitizerCoverageModule::runOnFunction(Function &F) {
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InjectTraceForGep(F, GepTraceTargets);
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return true;
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}
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void SanitizerCoverageModule::CreateFunctionGuardArray(size_t NumGuards, Function &F) {
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if (!Options.TracePCGuard) return;
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HasSancovGuardsSection = true;
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ArrayType *ArrayOfInt32Ty = ArrayType::get(Int32Ty, NumGuards);
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FunctionGuardArray = new GlobalVariable(
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*CurModule, ArrayOfInt32Ty, false, GlobalVariable::LinkOnceODRLinkage,
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Constant::getNullValue(ArrayOfInt32Ty), "__sancov_guard." + F.getName());
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if (auto Comdat = F.getComdat())
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FunctionGuardArray->setComdat(Comdat);
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FunctionGuardArray->setSection(SanCovTracePCGuardSection);
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FunctionGuardArray->setVisibility(GlobalValue::HiddenVisibility);
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}
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bool SanitizerCoverageModule::InjectCoverage(Function &F,
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ArrayRef<BasicBlock *> AllBlocks) {
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if (AllBlocks.empty()) return false;
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switch (Options.CoverageType) {
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case SanitizerCoverageOptions::SCK_None:
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return false;
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case SanitizerCoverageOptions::SCK_Function:
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InjectCoverageAtBlock(F, F.getEntryBlock(), false);
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CreateFunctionGuardArray(1, F);
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InjectCoverageAtBlock(F, F.getEntryBlock(), 0, false);
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return true;
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default: {
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bool UseCalls = ClCoverageBlockThreshold < AllBlocks.size();
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for (auto BB : AllBlocks)
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InjectCoverageAtBlock(F, *BB, UseCalls);
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CreateFunctionGuardArray(AllBlocks.size(), F);
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for (size_t i = 0, N = AllBlocks.size(); i < N; i++)
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InjectCoverageAtBlock(F, *AllBlocks[i], i, UseCalls);
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return true;
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}
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}
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@ -635,16 +666,8 @@ void SanitizerCoverageModule::SetNoSanitizeMetadata(Instruction *I) {
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}
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void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F, BasicBlock &BB,
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bool UseCalls) {
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// Don't insert coverage for unreachable blocks: we will never call
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// __sanitizer_cov() for them, so counting them in
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// NumberOfInstrumentedBlocks() might complicate calculation of code coverage
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// percentage. Also, unreachable instructions frequently have no debug
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// locations.
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if (isa<UnreachableInst>(BB.getTerminator()))
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return;
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size_t Idx, bool UseCalls) {
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BasicBlock::iterator IP = BB.getFirstInsertionPt();
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bool IsEntryBB = &BB == &F.getEntryBlock();
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DebugLoc EntryLoc;
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if (IsEntryBB) {
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@ -660,24 +683,22 @@ void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F, BasicBlock &BB,
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IRBuilder<> IRB(&*IP);
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IRB.SetCurrentDebugLocation(EntryLoc);
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Value *GuardP = IRB.CreateAdd(
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IRB.CreatePointerCast(GuardArray, IntptrTy),
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ConstantInt::get(IntptrTy, (1 + NumberOfInstrumentedBlocks()) * 4));
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Type *Int32PtrTy = PointerType::getUnqual(IRB.getInt32Ty());
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GuardP = IRB.CreateIntToPtr(GuardP, Int32PtrTy);
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if (Options.TracePC) {
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IRB.CreateCall(SanCovTracePC); // gets the PC using GET_CALLER_PC.
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IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
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} else if (Options.TracePCGuard) {
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auto GuardVar = new GlobalVariable(
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*F.getParent(), Int64Ty, false, GlobalVariable::LinkOnceODRLinkage,
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Constant::getNullValue(Int64Ty), "__sancov_guard." + F.getName());
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if (auto Comdat = F.getComdat())
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GuardVar->setComdat(Comdat);
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//auto GuardVar = new GlobalVariable(
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// *F.getParent(), Int64Ty, false, GlobalVariable::LinkOnceODRLinkage,
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// Constant::getNullValue(Int64Ty), "__sancov_guard." + F.getName());
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// if (auto Comdat = F.getComdat())
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// GuardVar->setComdat(Comdat);
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// TODO: add debug into to GuardVar.
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GuardVar->setSection(SanCovTracePCGuardSection);
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HasSancovGuardsSection = true;
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auto GuardPtr = IRB.CreatePointerCast(GuardVar, IntptrPtrTy);
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// GuardVar->setSection(SanCovTracePCGuardSection);
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// auto GuardPtr = IRB.CreatePointerCast(GuardVar, IntptrPtrTy);
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auto GuardPtr = IRB.CreateIntToPtr(
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IRB.CreateAdd(IRB.CreatePointerCast(FunctionGuardArray, IntptrTy),
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ConstantInt::get(IntptrTy, Idx * 4)),
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Int32PtrTy);
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if (!UseCalls) {
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auto GuardLoad = IRB.CreateLoad(GuardPtr);
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GuardLoad->setAtomic(AtomicOrdering::Monotonic);
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@ -692,24 +713,30 @@ void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F, BasicBlock &BB,
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}
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IRB.CreateCall(SanCovTracePCGuard, GuardPtr);
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IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
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} else if (Options.TraceBB) {
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IRB.CreateCall(IsEntryBB ? SanCovTraceEnter : SanCovTraceBB, GuardP);
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} else if (UseCalls) {
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IRB.CreateCall(SanCovWithCheckFunction, GuardP);
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} else {
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LoadInst *Load = IRB.CreateLoad(GuardP);
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Load->setAtomic(AtomicOrdering::Monotonic);
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Load->setAlignment(4);
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SetNoSanitizeMetadata(Load);
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Value *Cmp =
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IRB.CreateICmpSGE(Constant::getNullValue(Load->getType()), Load);
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Instruction *Ins = SplitBlockAndInsertIfThen(
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Cmp, &*IP, false, MDBuilder(*C).createBranchWeights(1, 100000));
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IRB.SetInsertPoint(Ins);
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IRB.SetCurrentDebugLocation(EntryLoc);
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// __sanitizer_cov gets the PC of the instruction using GET_CALLER_PC.
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IRB.CreateCall(SanCovFunction, GuardP);
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IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
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Value *GuardP = IRB.CreateAdd(
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IRB.CreatePointerCast(GuardArray, IntptrTy),
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ConstantInt::get(IntptrTy, (1 + NumberOfInstrumentedBlocks()) * 4));
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GuardP = IRB.CreateIntToPtr(GuardP, Int32PtrTy);
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if (Options.TraceBB) {
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IRB.CreateCall(IsEntryBB ? SanCovTraceEnter : SanCovTraceBB, GuardP);
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} else if (UseCalls) {
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IRB.CreateCall(SanCovWithCheckFunction, GuardP);
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} else {
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LoadInst *Load = IRB.CreateLoad(GuardP);
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Load->setAtomic(AtomicOrdering::Monotonic);
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Load->setAlignment(4);
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SetNoSanitizeMetadata(Load);
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Value *Cmp =
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IRB.CreateICmpSGE(Constant::getNullValue(Load->getType()), Load);
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Instruction *Ins = SplitBlockAndInsertIfThen(
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Cmp, &*IP, false, MDBuilder(*C).createBranchWeights(1, 100000));
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IRB.SetInsertPoint(Ins);
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IRB.SetCurrentDebugLocation(EntryLoc);
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// __sanitizer_cov gets the PC of the instruction using GET_CALLER_PC.
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IRB.CreateCall(SanCovFunction, GuardP);
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IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
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}
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}
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if (Options.Use8bitCounters) {
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@ -9,5 +9,4 @@ entry:
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ret void
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}
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; CHECK: @__sancov_guard.Foo = linkonce_odr global i64 0, section "__sancov_guards", comdat($Foo)
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; CHECK: @__sancov_guard.Foo = linkonce_odr hidden global [1 x i32] zeroinitializer, section "__sancov_guards", comdat($Foo)
|
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|
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@ -46,4 +46,4 @@ entry:
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; CHECK_PC_GUARD: call void @__sanitizer_cov_trace_pc_guard
|
||||
; CHECK_PC_GUARD-NOT: call void @__sanitizer_cov_trace_pc
|
||||
; CHECK_PC_GUARD: ret void
|
||||
; CHECK_PC_GUARD: call void @__sanitizer_cov_trace_pc_guard_init(i64* bitcast (i64** @__start___sancov_guards to i64*), i64* bitcast (i64** @__stop___sancov_guards to i64*))
|
||||
; CHECK_PC_GUARD: call void @__sanitizer_cov_trace_pc_guard_init(i32* bitcast (i32** @__start___sancov_guards to i32*), i32* bitcast (i32** @__stop___sancov_guards to i32*))
|
||||
|
||||
Loading…
Reference in New Issue
Block a user