AddressSanitizer.cpp revision 18c7f80b3e83ab584bd8572695a3cde8bafd9d3c
1800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===-- AddressSanitizer.cpp - memory error detector ------------*- C++ -*-===// 2800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 3800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The LLVM Compiler Infrastructure 4800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 5800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This file is distributed under the University of Illinois Open Source 6800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// License. See LICENSE.TXT for details. 7800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 8800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===----------------------------------------------------------------------===// 9800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 10800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This file is a part of AddressSanitizer, an address sanity checker. 11800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Details of the algorithm: 12800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// http://code.google.com/p/address-sanitizer/wiki/AddressSanitizerAlgorithm 13800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 14800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===----------------------------------------------------------------------===// 15800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 16800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#define DEBUG_TYPE "asan" 17800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 18800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/ArrayRef.h" 19800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/OwningPtr.h" 20800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallSet.h" 21800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallString.h" 22800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallVector.h" 23800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/StringExtras.h" 24800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Function.h" 25800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/IntrinsicInst.h" 26800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/LLVMContext.h" 27800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Module.h" 28800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/CommandLine.h" 29800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/DataTypes.h" 30800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/Debug.h" 31800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/IRBuilder.h" 32800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/MemoryBuffer.h" 33800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/Regex.h" 34800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/raw_ostream.h" 35800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/system_error.h" 36800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetData.h" 37800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetMachine.h" 38800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Instrumentation.h" 39800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/BasicBlockUtils.h" 40800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/ModuleUtils.h" 41800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Type.h" 42800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 43800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include <string> 44800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include <algorithm> 45800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 46800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyusing namespace llvm; 47800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 48800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowScale = 3; 49800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset32 = 1ULL << 29; 50800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset64 = 1ULL << 44; 51800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 52800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const size_t kMaxStackMallocSize = 1 << 16; // 64K 53800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3; 54800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kRetiredStackFrameMagic = 0x45E0360E; 55800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 56800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanModuleCtorName = "asan.module_ctor"; 577bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanModuleDtorName = "asan.module_dtor"; 587bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const int kAsanCtorAndCtorPriority = 1; 59800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanReportErrorTemplate = "__asan_report_"; 60800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanRegisterGlobalsName = "__asan_register_globals"; 617bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals"; 62800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanInitName = "__asan_init"; 63800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingOffsetName = "__asan_mapping_offset"; 64800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingScaleName = "__asan_mapping_scale"; 65800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackMallocName = "__asan_stack_malloc"; 66800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackFreeName = "__asan_stack_free"; 67800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 68800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackLeftRedzoneMagic = 0xf1; 69800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackMidRedzoneMagic = 0xf2; 70800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackRightRedzoneMagic = 0xf3; 71800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackPartialRedzoneMagic = 0xf4; 72800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 73800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Command-line flags. 74800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 75800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no-]asan-reads. 76800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentReads("asan-instrument-reads", 77800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument read instructions"), cl::Hidden, cl::init(true)); 78800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentWrites("asan-instrument-writes", 79800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument write instructions"), cl::Hidden, cl::init(true)); 80800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-stack. 81800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClStack("asan-stack", 82800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle stack memory"), cl::Hidden, cl::init(true)); 83800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-use-after-return. 84800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClUseAfterReturn("asan-use-after-return", 85800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Check return-after-free"), cl::Hidden, cl::init(false)); 86800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-globals. 87800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClGlobals("asan-globals", 88800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle global objects"), cl::Hidden, cl::init(true)); 89800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClMemIntrin("asan-memintrin", 90800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle memset/memcpy/memmove"), cl::Hidden, cl::init(true)); 91800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -fasan-blacklist. 92800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClBlackListFile("asan-blacklist", 93800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("File containing the list of functions to ignore " 94800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "during instrumentation"), cl::Hidden); 95800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 96800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// These flags allow to change the shadow mapping. 97800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The shadow mapping looks like 98800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Shadow = (Mem >> scale) + (1 << offset_log) 99800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingScale("asan-mapping-scale", 100800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("scale of asan shadow mapping"), cl::Hidden, cl::init(0)); 101800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingOffsetLog("asan-mapping-offset-log", 102800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("offset of asan shadow mapping"), cl::Hidden, cl::init(-1)); 103800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 104800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Optimization flags. Not user visible, used mostly for testing 105800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// and benchmarking the tool. 106800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOpt("asan-opt", 107800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Optimize instrumentation"), cl::Hidden, cl::init(true)); 108800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptSameTemp("asan-opt-same-temp", 109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Instrument the same temp just once"), cl::Hidden, 110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(true)); 111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptGlobals("asan-opt-globals", 112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Don't instrument scalar globals"), cl::Hidden, cl::init(true)); 113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Debug flags. 115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebug("asan-debug", cl::desc("debug"), cl::Hidden, 116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(0)); 117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugStack("asan-debug-stack", cl::desc("debug stack"), 118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(0)); 119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClDebugFunc("asan-debug-func", 120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::desc("Debug func")); 121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMin("asan-debug-min", cl::desc("Debug min inst"), 122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 123800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMax("asan-debug-max", cl::desc("Debug man inst"), 124800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 125800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 126800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanynamespace { 127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Blacklisted functions are not instrumented. 129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The blacklist file contains one or more lines like this: 130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// --- 131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// fun:FunctionWildCard 132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// --- 133800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This is similar to the "ignore" feature of ThreadSanitizer. 134800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// http://code.google.com/p/data-race-test/wiki/ThreadSanitizerIgnores 135800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyclass BlackList { 136800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany public: 137800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BlackList(const std::string &Path); 138800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool isIn(const Function &F); 139800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 140800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Regex *Functions; 141800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 142800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 143800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany/// AddressSanitizer: instrument the code in module to find memory bugs. 144800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystruct AddressSanitizer : public ModulePass { 145800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AddressSanitizer(); 14625878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko virtual const char *getPassName() const; 147800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void instrumentMop(Instruction *I); 148800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void instrumentAddress(Instruction *OrigIns, IRBuilder<> &IRB, 149800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, uint32_t TypeSize, bool IsWrite); 150800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *generateCrashCode(IRBuilder<> &IRB, Value *Addr, 151800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool IsWrite, uint32_t TypeSize); 152800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool instrumentMemIntrinsic(MemIntrinsic *MI); 153800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void instrumentMemIntrinsicParam(Instruction *OrigIns, Value *Addr, 154800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Size, 155800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore, bool IsWrite); 156800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *memToShadow(Value *Shadow, IRBuilder<> &IRB); 157800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool handleFunction(Module &M, Function &F); 158a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany bool maybeInsertAsanInitAtFunctionEntry(Function &F); 159800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool poisonStackInFunction(Module &M, Function &F); 160800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany virtual bool runOnModule(Module &M); 161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool insertGlobalRedzones(Module &M); 162800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BranchInst *splitBlockAndInsertIfThen(Instruction *SplitBefore, Value *Cmp); 163800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany static char ID; // Pass identification, replacement for typeid 164800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 165800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 166800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 167800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAllocaSizeInBytes(AllocaInst *AI) { 168800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = AI->getAllocatedType(); 169800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = TD->getTypeStoreSizeInBits(Ty) / 8; 170800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return SizeInBytes; 171800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 172800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedSize(uint64_t SizeInBytes) { 173800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return ((SizeInBytes + RedzoneSize - 1) 174800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany / RedzoneSize) * RedzoneSize; 175800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 176800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedAllocaSize(AllocaInst *AI) { 177800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 178800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return getAlignedSize(SizeInBytes); 179800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 180800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 181800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, 182800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison); 1835a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany bool LooksLikeCodeInBug11395(Instruction *I); 184800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 185800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Module *CurrentModule; 186800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LLVMContext *C; 187800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TargetData *TD; 188800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t MappingOffset; 189800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int MappingScale; 190800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize; 191800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int LongSize; 192800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrTy; 193800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrPtrTy; 194800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanCtorFunction; 195800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanInitFunction; 196800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *CtorInsertBefore; 197800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OwningPtr<BlackList> BL; 198800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 199800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} // namespace 200800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 201800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanychar AddressSanitizer::ID = 0; 202800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyINITIALIZE_PASS(AddressSanitizer, "asan", 203800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs.", 204800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany false, false) 205800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyAddressSanitizer::AddressSanitizer() : ModulePass(ID) { } 206800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyModulePass *llvm::createAddressSanitizerPass() { 207800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new AddressSanitizer(); 208800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 209800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 21025878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenkoconst char *AddressSanitizer::getPassName() const { 21125878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko return "AddressSanitizer"; 21225878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko} 21325878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko 214800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Create a constant for Str so that we can pass it to the run-time lib. 215800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) { 21618c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str); 217800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new GlobalVariable(M, StrConst->getType(), true, 218800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::PrivateLinkage, StrConst, ""); 219800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 220800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 221800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Split the basic block and insert an if-then code. 222800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Before: 223800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Head 224800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// SplitBefore 225800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Tail 226800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// After: 227800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Head 228800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// if (Cmp) 229800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// NewBasicBlock 230800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// SplitBefore 231800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Tail 232800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 233800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Returns the NewBasicBlock's terminator. 234800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyBranchInst *AddressSanitizer::splitBlockAndInsertIfThen( 235800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *SplitBefore, Value *Cmp) { 236800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *Head = SplitBefore->getParent(); 237800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *Tail = Head->splitBasicBlock(SplitBefore); 238800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TerminatorInst *HeadOldTerm = Head->getTerminator(); 239800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *NewBasicBlock = 240800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock::Create(*C, "", Head->getParent()); 241800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BranchInst *HeadNewTerm = BranchInst::Create(/*ifTrue*/NewBasicBlock, 242800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany /*ifFalse*/Tail, 243800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Cmp); 244800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ReplaceInstWithInst(HeadOldTerm, HeadNewTerm); 245800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 246800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BranchInst *CheckTerm = BranchInst::Create(Tail, NewBasicBlock); 247800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return CheckTerm; 248800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 249800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 250800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyValue *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) { 251800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Shadow >> scale 252800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Shadow = IRB.CreateLShr(Shadow, MappingScale); 253800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (MappingOffset == 0) 254800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Shadow; 255800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Shadow >> scale) | offset 256800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return IRB.CreateOr(Shadow, ConstantInt::get(IntptrTy, 257800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset)); 258800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 259800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 260800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentMemIntrinsicParam(Instruction *OrigIns, 261800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) { 262800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the first byte. 263800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 264800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 265800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(OrigIns, IRB, Addr, 8, IsWrite); 266800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 267800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the last byte. 268800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 269800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 270800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *SizeMinusOne = IRB.CreateSub( 271800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Size, ConstantInt::get(Size->getType(), 1)); 272800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SizeMinusOne = IRB.CreateIntCast(SizeMinusOne, IntptrTy, false); 273800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 274800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrPlusSizeMinisOne = IRB.CreateAdd(AddrLong, SizeMinusOne); 275800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(OrigIns, IRB, AddrPlusSizeMinisOne, 8, IsWrite); 276800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 277800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 278800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 279800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Instrument memset/memmove/memcpy 280800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::instrumentMemIntrinsic(MemIntrinsic *MI) { 281800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Dst = MI->getDest(); 282800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI); 283800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Src = MemTran ? MemTran->getSource() : NULL; 284800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Length = MI->getLength(); 285800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 286800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *ConstLength = dyn_cast<Constant>(Length); 287800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore = MI; 288800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength) { 289800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength->isNullValue()) return false; 290800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 291800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // The size is not a constant so it could be zero -- check at run-time. 292800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 293800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 294800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(Length, 295800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(Length->getType())); 296800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany InsertBefore = splitBlockAndInsertIfThen(InsertBefore, Cmp); 297800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 298800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 299800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsicParam(MI, Dst, Length, InsertBefore, true); 300800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Src) 301800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsicParam(MI, Src, Length, InsertBefore, false); 302800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 303800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 304800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 305800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic Value *getLDSTOperand(Instruction *I) { 306800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 307800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return LI->getPointerOperand(); 308800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 309800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return cast<StoreInst>(*I).getPointerOperand(); 310800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 311800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 312800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentMop(Instruction *I) { 313800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int IsWrite = isa<StoreInst>(*I); 314800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr = getLDSTOperand(I); 315800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptGlobals && isa<GlobalVariable>(Addr)) { 316800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We are accessing a global scalar variable. Nothing to catch here. 317800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 318800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 319800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigPtrTy = Addr->getType(); 320800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 321800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 322800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(OrigTy->isSized()); 323800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 324800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 325800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize != 8 && TypeSize != 16 && 326800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 327800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all unusual sizes. 328800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 329800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 330800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 331800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(I); 332800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(I, IRB, Addr, TypeSize, IsWrite); 333800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 334800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 335800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyInstruction *AddressSanitizer::generateCrashCode( 336800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, bool IsWrite, uint32_t TypeSize) { 3373c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany // IsWrite and TypeSize are encoded in the function name. 3383c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany std::string FunctionName = std::string(kAsanReportErrorTemplate) + 3393c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany (IsWrite ? "store" : "load") + itostr(TypeSize / 8); 3403c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany Value *ReportWarningFunc = CurrentModule->getOrInsertFunction( 3413c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany FunctionName, IRB.getVoidTy(), IntptrTy, NULL); 3423c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany CallInst *Call = IRB.CreateCall(ReportWarningFunc, Addr); 3433c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany Call->setDoesNotReturn(); 3443c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany return Call; 345800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 346800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 347800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentAddress(Instruction *OrigIns, 348800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, 349800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize, bool IsWrite) { 350800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 351800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 352800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowTy = IntegerType::get( 353800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *C, std::max(8U, TypeSize >> MappingScale)); 354800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowPtrTy = PointerType::get(ShadowTy, 0); 355800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowPtr = memToShadow(AddrLong, IRB); 356800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *CmpVal = Constant::getNullValue(ShadowTy); 357800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowValue = IRB.CreateLoad( 358800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy)); 359800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 360800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal); 361800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 362800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *CheckTerm = splitBlockAndInsertIfThen( 363800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cast<Instruction>(Cmp)->getNextNode(), Cmp); 364800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB2(CheckTerm); 365800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 366800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Granularity = 1 << MappingScale; 367800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize < 8 * Granularity) { 368800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Addr & (Granularity - 1) 369800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Lower3Bits = IRB2.CreateAnd( 370800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AddrLong, ConstantInt::get(IntptrTy, Granularity - 1)); 371800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Addr & (Granularity - 1)) + size - 1 372800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LastAccessedByte = IRB2.CreateAdd( 373800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Lower3Bits, ConstantInt::get(IntptrTy, TypeSize / 8 - 1)); 374800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (uint8_t) ((Addr & (Granularity-1)) + size - 1) 375800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LastAccessedByte = IRB2.CreateIntCast( 376800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LastAccessedByte, IRB.getInt8Ty(), false); 377800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue 378800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp2 = IRB2.CreateICmpSGE(LastAccessedByte, ShadowValue); 379800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 380800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CheckTerm = splitBlockAndInsertIfThen(CheckTerm, Cmp2); 381800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 382800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 383800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB1(CheckTerm); 384800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Crash = generateCrashCode(IRB1, AddrLong, IsWrite, TypeSize); 385800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Crash->setDebugLoc(OrigIns->getDebugLoc()); 386cc1d856d8e8e11407b3c6c1d08768f77c3722e38Kostya Serebryany ReplaceInstWithInst(CheckTerm, new UnreachableInst(*C)); 387800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 388800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 389800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This function replaces all global variables with new variables that have 390800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// trailing redzones. It also creates a function that poisons 391800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// redzones and inserts this function into llvm.global_ctors. 392800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::insertGlobalRedzones(Module &M) { 393800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<GlobalVariable *, 16> GlobalsToChange; 394800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 395800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Module::GlobalListType::iterator G = M.getGlobalList().begin(), 396800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany E = M.getGlobalList().end(); G != E; ++G) { 397800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = cast<PointerType>(G->getType())->getElementType(); 398800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "GLOBAL: " << *G); 399800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 400800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!Ty->isSized()) continue; 401800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!G->hasInitializer()) continue; 4027cf2a04361e8613264498e50babe52d65c070473Kostya Serebryany // Touch only those globals that will not be defined in other modules. 4037cf2a04361e8613264498e50babe52d65c070473Kostya Serebryany // Don't handle ODR type linkages since other modules may be built w/o asan. 4042e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 4052e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany G->getLinkage() != GlobalVariable::PrivateLinkage && 4062e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany G->getLinkage() != GlobalVariable::InternalLinkage) 407800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 408d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // Two problems with thread-locals: 409d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // - The address of the main thread's copy can't be computed at link-time. 410d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // - Need to poison all copies, not just the main thread's one. 411d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany if (G->isThreadLocal()) 412d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany continue; 413800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For now, just ignore this Alloca if the alignment is large. 414800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (G->getAlignment() > RedzoneSize) continue; 415800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 416800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all the globals with the names starting with "\01L_OBJC_". 417800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Many of those are put into the .cstring section. The linker compresses 418800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // that section by removing the spare \0s after the string terminator, so 419800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // our redzones get broken. 420800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if ((G->getName().find("\01L_OBJC_") == 0) || 421800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (G->getName().find("\01l_OBJC_") == 0)) { 422800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G); 423800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 424800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 425800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 426800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (G->hasSection()) { 427800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Section(G->getSection()); 4288375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Ignore the globals from the __OBJC section. The ObjC runtime assumes 4298375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to 4308375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // them. 431800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if ((Section.find("__OBJC,") == 0) || 432800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Section.find("__DATA, __objc_") == 0)) { 433800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G); 434800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 435800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 4368375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // See http://code.google.com/p/address-sanitizer/issues/detail?id=32 4378375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Constant CFString instances are compiled in the following way: 4388375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // -- the string buffer is emitted into 4398375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // __TEXT,__cstring,cstring_literals 4408375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // -- the constant NSConstantString structure referencing that buffer 4418375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // is placed into __DATA,__cfstring 4428375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Therefore there's no point in placing redzones into __DATA,__cfstring. 4438375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Moreover, it causes the linker to crash on OS X 10.7 4448375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko if (Section.find("__DATA,__cfstring") == 0) { 4458375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko DEBUG(dbgs() << "Ignoring CFString: " << *G); 4468375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko continue; 4478375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko } 448800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 449800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 450800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalsToChange.push_back(G); 451800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 452800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 453800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t n = GlobalsToChange.size(); 454800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (n == 0) return false; 455800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 456800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A global is described by a structure 457800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t beg; 458800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size; 459800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size_with_redzone; 460800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // const char *name; 461800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We initialize an array of such structures and pass it to a run-time call. 462800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy, 463800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy, IntptrTy, NULL); 464800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Constant *, 16> Initializers(n); 465800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 466800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 467800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 468800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < n; i++) { 469800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *G = GlobalsToChange[i]; 470800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PointerType *PtrTy = cast<PointerType>(G->getType()); 471800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = PtrTy->getElementType(); 472800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = TD->getTypeStoreSizeInBits(Ty) / 8; 473800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t RightRedzoneSize = RedzoneSize + 474800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (RedzoneSize - (SizeInBytes % RedzoneSize)); 475800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize); 476800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 477800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL); 478800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *NewInitializer = ConstantStruct::get( 479800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewTy, G->getInitializer(), 480800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(RightRedZoneTy), NULL); 481800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 482a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany SmallString<2048> DescriptionOfGlobal = G->getName(); 483a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += " ("; 484a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += M.getModuleIdentifier(); 485a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += ")"; 486a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal); 487800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 488800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Create a new global variable with enough space for a redzone. 489800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *NewGlobal = new GlobalVariable( 490800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, NewTy, G->isConstant(), G->getLinkage(), 491800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewInitializer, "", G, G->isThreadLocal()); 492800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->copyAttributesFrom(G); 493800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->setAlignment(RedzoneSize); 494800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 495800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Indices2[2]; 496800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[0] = IRB.getInt32(0); 497800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[1] = IRB.getInt32(0); 498800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 499800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->replaceAllUsesWith( 500f1639abf1aaba1448f719f595156cd0f4cd560ccKostya Serebryany ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true)); 501800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->takeName(G); 502800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->eraseFromParent(); 503800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 504800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Initializers[i] = ConstantStruct::get( 505800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalStructTy, 506800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(NewGlobal, IntptrTy), 507800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes), 508800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize), 509800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(Name, IntptrTy), 510800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NULL); 511800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "NEW GLOBAL:\n" << *NewGlobal); 512800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 513800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 514800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n); 515800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *AllGlobals = new GlobalVariable( 516800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage, 517800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantArray::get(ArrayOfGlobalStructTy, Initializers), ""); 518800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 519800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanRegisterGlobals = cast<Function>(M.getOrInsertFunction( 520800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanRegisterGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 521800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanRegisterGlobals->setLinkage(Function::ExternalLinkage); 522800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 523800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall2(AsanRegisterGlobals, 524800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 525800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, n)); 526800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5277bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // We also need to unregister globals at the end, e.g. when a shared library 5287bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // gets closed. 5297bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanDtorFunction = Function::Create( 5307bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 5317bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleDtorName, &M); 5327bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction); 5337bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB)); 5347bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanUnregisterGlobals = cast<Function>(M.getOrInsertFunction( 5357bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany kAsanUnregisterGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 5367bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage); 5377bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 5387bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB_Dtor.CreateCall2(AsanUnregisterGlobals, 5397bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 5407bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany ConstantInt::get(IntptrTy, n)); 5417bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalDtors(M, AsanDtorFunction, kAsanCtorAndCtorPriority); 5427bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 543800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << M); 544800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 545800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 546800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 547800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// virtual 548800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::runOnModule(Module &M) { 549800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Initialize the private fields. No one has accessed them before. 550800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TD = getAnalysisIfAvailable<TargetData>(); 551800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TD) 552800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 553800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BL.reset(new BlackList(ClBlackListFile)); 554800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 555800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CurrentModule = &M; 556800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany C = &(M.getContext()); 557800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LongSize = TD->getPointerSizeInBits(); 558800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy = Type::getIntNTy(*C, LongSize); 559800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrPtrTy = PointerType::get(IntptrTy, 0); 560800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 561800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanCtorFunction = Function::Create( 562800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 563800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::InternalLinkage, kAsanModuleCtorName, &M); 564800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction); 565800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CtorInsertBefore = ReturnInst::Create(*C, AsanCtorBB); 566800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 567800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // call __asan_init in the module ctor. 568800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 569800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanInitFunction = cast<Function>( 570800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL)); 571800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanInitFunction->setLinkage(Function::ExternalLinkage); 572800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall(AsanInitFunction); 573800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 574800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = LongSize == 32 575800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ? kDefaultShadowOffset32 : kDefaultShadowOffset64; 576800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog >= 0) { 577800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog == 0) { 578800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // special case 579800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 0; 580800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 581800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 1ULL << ClMappingOffsetLog; 582800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 583800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 584800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = kDefaultShadowScale; 585800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingScale) { 586800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = ClMappingScale; 587800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 588800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Redzone used for stack and globals is at least 32 bytes. 589800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively. 590800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize = std::max(32, (int)(1 << MappingScale)); 591800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 592800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool Res = false; 593800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 594800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClGlobals) 595800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Res |= insertGlobalRedzones(M); 596800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 597800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Tell the run-time the current values of mapping offset and scale. 598800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue *asan_mapping_offset = 599800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 600800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, MappingOffset), 601800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanMappingOffsetName); 602800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue *asan_mapping_scale = 603800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 604800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, MappingScale), 605800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanMappingScaleName); 606800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Read these globals, otherwise they may be optimized away. 607800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateLoad(asan_mapping_scale, true); 608800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateLoad(asan_mapping_offset, true); 609800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 610800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 611800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) { 612800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (F->isDeclaration()) continue; 613800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Res |= handleFunction(M, *F); 614800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 615800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6167bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority); 6179b02741d2284d9516a59666c211fe1f57e8803adKostya Serebryany 618800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Res; 619800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 620800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 621a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryanybool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) { 622a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // For each NSObject descendant having a +load method, this method is invoked 623a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // by the ObjC runtime before any of the static constructors is called. 624a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // Therefore we need to instrument such methods with a call to __asan_init 625a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // at the beginning in order to initialize our runtime before any access to 626a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // the shadow memory. 627a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // We cannot just ignore these methods, because they may call other 628a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // instrumented functions. 629a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany if (F.getName().find(" load]") != std::string::npos) { 630a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRBuilder<> IRB(F.begin()->begin()); 631a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRB.CreateCall(AsanInitFunction); 632a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return true; 633a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany } 634a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return false; 635a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany} 636a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 637800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::handleFunction(Module &M, Function &F) { 638800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (BL->isIn(F)) return false; 639800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (&F == AsanCtorFunction) return false; 640a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 641a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // If needed, insert __asan_init before checking for AddressSafety attr. 642a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany maybeInsertAsanInitAtFunctionEntry(F); 643a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 6440307b9a88574d7e54459181afaa656ac92971847Kostya Serebryany if (!F.hasFnAttr(Attribute::AddressSafety)) return false; 645800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 646800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClDebugFunc.empty() && ClDebugFunc != F.getName()) 647800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 648800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We want to instrument every address only once per basic block 649800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (unless there are calls between uses). 650800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallSet<Value*, 16> TempsToInstrument; 651800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 16> ToInstrument; 652800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 653800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Fill the set of memory operations to instrument. 654800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 655800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 656800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 657800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); 658800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 659bcb55ce3862bbbedac4e09d7099c9e0efc434e4bKostya Serebryany if (LooksLikeCodeInBug11395(BI)) return false; 660800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if ((isa<LoadInst>(BI) && ClInstrumentReads) || 661800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (isa<StoreInst>(BI) && ClInstrumentWrites)) { 662800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr = getLDSTOperand(BI); 663800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptSameTemp) { 664800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TempsToInstrument.insert(Addr)) 665800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; // We've seen this temp in the current BB. 666800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 667800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (isa<MemIntrinsic>(BI) && ClMemIntrin) { 668800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ok, take it. 669800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 670800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (isa<CallInst>(BI)) { 671800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A call inside BB. 672800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 673800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 674800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 675800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 676800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ToInstrument.push_back(BI); 677800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 678800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 679800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 680800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Instrument. 681800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int NumInstrumented = 0; 682800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = ToInstrument.size(); i != n; i++) { 683800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Inst = ToInstrument[i]; 684800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugMin < 0 || ClDebugMax < 0 || 685800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) { 686800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (isa<StoreInst>(Inst) || isa<LoadInst>(Inst)) 687800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMop(Inst); 688800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany else 689800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsic(cast<MemIntrinsic>(Inst)); 690800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 691800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NumInstrumented++; 692800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 693800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 694800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 695800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 696800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool ChangedStack = poisonStackInFunction(M, F); 697800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return NumInstrumented > 0 || ChangedStack; 698800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 699800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 700800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) { 701800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 1) return PoisonByte; 702800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 2) return (PoisonByte << 8) + PoisonByte; 703800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 4) 704800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return (PoisonByte << 24) + (PoisonByte << 16) + 705800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (PoisonByte << 8) + (PoisonByte); 706800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(0 && "ShadowRedzoneSize is either 1, 2 or 4"); 707800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return 0; 708800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 709800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 710800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic void PoisonShadowPartialRightRedzone(uint8_t *Shadow, 711800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Size, 712800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize, 713800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowGranularity, 714800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint8_t Magic) { 715800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < RedzoneSize; 716800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany i+= ShadowGranularity, Shadow++) { 717800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (i + ShadowGranularity <= Size) { 718800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = 0; // fully addressable 719800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (i >= Size) { 720800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Magic; // unaddressable 721800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 722800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Size - i; // first Size-i bytes are addressable 723800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 724800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 725800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 726800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 727800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, 728800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB, 729800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison) { 730800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowRZSize = RedzoneSize >> MappingScale; 731800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowRZSize >= 1 && ShadowRZSize <= 4); 732800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8); 733800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZPtrTy = PointerType::get(RZTy, 0); 734800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 735800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonLeft = ConstantInt::get(RZTy, 736800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackLeftRedzoneMagic : 0LL, ShadowRZSize)); 737800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonMid = ConstantInt::get(RZTy, 738800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackMidRedzoneMagic : 0LL, ShadowRZSize)); 739800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonRight = ConstantInt::get(RZTy, 740800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackRightRedzoneMagic : 0LL, ShadowRZSize)); 741800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 742800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison the first red zone. 743800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy)); 744800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 745800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison all other red zones. 746800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 747800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 748800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 749800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 750800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 751800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(AlignedSize - SizeInBytes < RedzoneSize); 752800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Ptr = NULL; 753800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 754800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize; 755800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 756800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowBase->getType() == IntptrTy); 757800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (SizeInBytes < AlignedSize) { 758800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the partial redzone at right 759800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd( 760800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ShadowBase, ConstantInt::get(IntptrTy, 761800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Pos >> MappingScale) - ShadowRZSize)); 762800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t AddressableBytes = RedzoneSize - (AlignedSize - SizeInBytes); 763800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t Poison = 0; 764800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoPoison) { 765800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes, 766800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize, 767800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1ULL << MappingScale, 768800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackPartialRedzoneMagic); 769800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 770800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PartialPoison = ConstantInt::get(RZTy, Poison); 771800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PartialPoison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 772800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 773800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 774800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the full redzone at right. 775800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd(ShadowBase, 776800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, Pos >> MappingScale)); 777800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Poison = i == AllocaVec.size() - 1 ? PoisonRight : PoisonMid; 778800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 779800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 780800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += RedzoneSize; 781800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 782800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 783800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7845a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// Workaround for bug 11395: we don't want to instrument stack in functions 7855a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// with large assembly blobs (32-bit only), otherwise reg alloc may crash. 786d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany// FIXME: remove once the bug 11395 is fixed. 7875a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryanybool AddressSanitizer::LooksLikeCodeInBug11395(Instruction *I) { 7885a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (LongSize != 32) return false; 7895a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany CallInst *CI = dyn_cast<CallInst>(I); 7905a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (!CI || !CI->isInlineAsm()) return false; 7915a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (CI->getNumArgOperands() <= 5) return false; 7925a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany // We have inline assembly with quite a few arguments. 7935a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany return true; 7945a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany} 7955a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany 796800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Find all static Alloca instructions and put 797800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// poisoned red zones around all of them. 798800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Then unpoison everything back before the function returns. 799800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 800800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Stack poisoning does not play well with exception handling. 801800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// When an exception is thrown, we essentially bypass the code 802800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// that unpoisones the stack. This is why the run-time library has 803800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// to intercept __cxa_throw (as well as longjmp, etc) and unpoison the entire 804800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// stack in the interceptor. This however does not work inside the 805800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// actual function which catches the exception. Most likely because the 806800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// compiler hoists the load of the shadow value somewhere too high. 807800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This causes asan to report a non-existing bug on 453.povray. 808800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// It sounds like an LLVM bug. 809800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::poisonStackInFunction(Module &M, Function &F) { 810800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClStack) return false; 811800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<AllocaInst*, 16> AllocaVec; 812800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 8> RetVec; 813800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t TotalSize = 0; 814800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 815800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Filter out Alloca instructions we want (and can) handle. 816800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Collect Ret instructions. 817800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 818800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 819800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock &BB = *FI; 820800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = BB.begin(), BE = BB.end(); 821800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 822800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (isa<ReturnInst>(BI)) { 823800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RetVec.push_back(BI); 824800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 825800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 826800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 827800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = dyn_cast<AllocaInst>(BI); 828800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI) continue; 829800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->isArrayAllocation()) continue; 830800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->isStaticAlloca()) continue; 831800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->getAllocatedType()->isSized()) continue; 832800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->getAlignment() > RedzoneSize) continue; 833800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaVec.push_back(AI); 834800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 835800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TotalSize += AlignedSize; 836800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 837800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 838800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 839800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AllocaVec.empty()) return false; 840800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 841800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t LocalStackSize = TotalSize + (AllocaVec.size() + 1) * RedzoneSize; 842800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 843800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool DoStackMalloc = ClUseAfterReturn 844800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany && LocalStackSize <= kMaxStackMallocSize; 845800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 846800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsBefore = AllocaVec[0]; 847800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsBefore); 848800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 849800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 850800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize); 851800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *MyAlloca = 852800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore); 853800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MyAlloca->setAlignment(RedzoneSize); 854800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(MyAlloca->isStaticAlloca()); 855800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy); 856800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LocalStackBase = OrigStackBase; 857800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 858800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 859800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AsanStackMallocFunc = M.getOrInsertFunction( 860800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL); 861800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc, 862800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase); 863800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 864800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 865800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // This string will be parsed by the run-time (DescribeStackAddress). 866800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallString<2048> StackDescriptionStorage; 867800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany raw_svector_ostream StackDescription(StackDescriptionStorage); 868800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << F.getName() << " " << AllocaVec.size() << " "; 869800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 870800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 871800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Replace Alloca instructions with base+offset. 872800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 873800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 874800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 875800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Name = AI->getName(); 876800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << Pos << " " << SizeInBytes << " " 877800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany << Name.size() << " " << Name << " "; 878800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 879800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert((AlignedSize % RedzoneSize) == 0); 880800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->replaceAllUsesWith( 881800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr( 882800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)), 883800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->getType())); 884800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize + RedzoneSize; 885800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 886800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(Pos == LocalStackSize); 887800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 888800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Write the Magic value and the frame description constant to the redzone. 889800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus0 = IRB.CreateIntToPtr(LocalStackBase, IntptrPtrTy); 890800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(ConstantInt::get(IntptrTy, kCurrentStackFrameMagic), 891800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 892800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus1 = IRB.CreateAdd(LocalStackBase, 893800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LongSize/8)); 894800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy); 895800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Description = IRB.CreatePointerCast( 896800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany createPrivateGlobalForString(M, StackDescription.str()), 897800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy); 898800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Description, BasePlus1); 899800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 900800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the stack redzones at the entry. 901800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase = memToShadow(LocalStackBase, IRB); 902800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRB, ShadowBase, true); 903800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 904800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AsanStackFreeFunc = NULL; 905800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 906800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanStackFreeFunc = M.getOrInsertFunction( 907800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackFreeName, IRB.getVoidTy(), 908800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy, IntptrTy, IntptrTy, NULL); 909800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 910800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 911800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack before all ret instructions. 912800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = RetVec.size(); i < n; i++) { 913800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Ret = RetVec[i]; 914800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRBRet(Ret); 915800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 916800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Mark the current frame as retired. 917800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateStore(ConstantInt::get(IntptrTy, kRetiredStackFrameMagic), 918800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 919800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack. 920800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRBRet, ShadowBase, false); 921800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 922800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 923800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateCall3(AsanStackFreeFunc, LocalStackBase, 924800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), 925800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OrigStackBase); 926800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 927800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 928800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 929800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugStack) { 930800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 931800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 932800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 933800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 934800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 935800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 936800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyBlackList::BlackList(const std::string &Path) { 937800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Functions = NULL; 938800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany const char *kFunPrefix = "fun:"; 939800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClBlackListFile.size()) return; 940800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany std::string Fun; 941800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 942800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OwningPtr<MemoryBuffer> File; 943800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (error_code EC = MemoryBuffer::getFile(ClBlackListFile.c_str(), File)) { 944cc1d856d8e8e11407b3c6c1d08768f77c3722e38Kostya Serebryany report_fatal_error("Can't open blacklist file " + ClBlackListFile + ": " + 945cc1d856d8e8e11407b3c6c1d08768f77c3722e38Kostya Serebryany EC.message()); 946800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 947800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemoryBuffer *Buff = File.take(); 948800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany const char *Data = Buff->getBufferStart(); 949800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t DataLen = Buff->getBufferSize(); 950800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<StringRef, 16> Lines; 951800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SplitString(StringRef(Data, DataLen), Lines, "\n\r"); 952800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, numLines = Lines.size(); i < numLines; i++) { 953800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Lines[i].startswith(kFunPrefix)) { 954800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany std::string ThisFunc = Lines[i].substr(strlen(kFunPrefix)); 955085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany std::string ThisFuncRE; 956800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // add ThisFunc replacing * with .* 957800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t j = 0, n = ThisFunc.size(); j < n; j++) { 958800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ThisFunc[j] == '*') 959085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany ThisFuncRE += '.'; 960085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany ThisFuncRE += ThisFunc[j]; 961800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 962085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany // Check that the regexp is valid. 963085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany Regex CheckRE(ThisFuncRE); 964085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany std::string Error; 965085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany if (!CheckRE.isValid(Error)) 966085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany report_fatal_error("malformed blacklist regex: " + ThisFunc + 967085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany ": " + Error); 968085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany // Append to the final regexp. 969085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany if (Fun.size()) 970085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany Fun += "|"; 971085cb8f0b957841ab667a46be0c49ce4ee8c9c79Kostya Serebryany Fun += ThisFuncRE; 972800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 973800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 974800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Fun.size()) { 975800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Functions = new Regex(Fun); 976800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 977800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 978800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 979800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool BlackList::isIn(const Function &F) { 980800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Functions) { 981800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool Res = Functions->match(F.getName()); 982800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Res; 983800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 984800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 985800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 986