AddressSanitizer.cpp revision 56139bc493790612ee6281630678e293be6b2eb2
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 18a1c45044099cf7fb4a072f1326f164706d5bb2e2Kostya Serebryany#include "FunctionBlackList.h" 1906cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Function.h" 2006cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/IRBuilder.h" 2106cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/IntrinsicInst.h" 2206cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/LLVMContext.h" 2306cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Module.h" 2406cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Type.h" 25800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/ArrayRef.h" 26800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/OwningPtr.h" 27800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallSet.h" 28800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallString.h" 29800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallVector.h" 30800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/StringExtras.h" 3106fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov#include "llvm/ADT/Triple.h" 32800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/CommandLine.h" 33800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/DataTypes.h" 34800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/Debug.h" 35800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/raw_ostream.h" 36800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/system_error.h" 37800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetData.h" 38800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetMachine.h" 39800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Instrumentation.h" 40800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/BasicBlockUtils.h" 41800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/ModuleUtils.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; 5106fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanovstatic const uint64_t kDefaultShadowOffsetAndroid = 0; 52800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 53800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const size_t kMaxStackMallocSize = 1 << 16; // 64K 54800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3; 55800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kRetiredStackFrameMagic = 0x45E0360E; 56800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 57800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanModuleCtorName = "asan.module_ctor"; 587bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanModuleDtorName = "asan.module_dtor"; 597bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const int kAsanCtorAndCtorPriority = 1; 60800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanReportErrorTemplate = "__asan_report_"; 61800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanRegisterGlobalsName = "__asan_register_globals"; 627bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals"; 63800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanInitName = "__asan_init"; 6495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryanystatic const char *kAsanHandleNoReturnName = "__asan_handle_no_return"; 65800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingOffsetName = "__asan_mapping_offset"; 66800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingScaleName = "__asan_mapping_scale"; 67800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackMallocName = "__asan_stack_malloc"; 68800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackFreeName = "__asan_stack_free"; 69800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 70800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackLeftRedzoneMagic = 0xf1; 71800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackMidRedzoneMagic = 0xf2; 72800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackRightRedzoneMagic = 0xf3; 73800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackPartialRedzoneMagic = 0xf4; 74800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 75800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Command-line flags. 76800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 77800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no-]asan-reads. 78800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentReads("asan-instrument-reads", 79800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument read instructions"), cl::Hidden, cl::init(true)); 80800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentWrites("asan-instrument-writes", 81800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument write instructions"), cl::Hidden, cl::init(true)); 82e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic cl::opt<bool> ClInstrumentAtomics("asan-instrument-atomics", 83e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::desc("instrument atomic instructions (rmw, cmpxchg)"), 84e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::Hidden, cl::init(true)); 85324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// This flags limits the number of instructions to be instrumented 86324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// in any given BB. Normally, this should be set to unlimited (INT_MAX), 87324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// but due to http://llvm.org/bugs/show_bug.cgi?id=12652 we temporary 88324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// set it to 10000. 89324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryanystatic cl::opt<int> ClMaxInsnsToInstrumentPerBB("asan-max-ins-per-bb", 90324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::init(10000), 91324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::desc("maximal number of instructions to instrument in any given BB"), 92324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::Hidden); 93800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-stack. 94800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClStack("asan-stack", 95800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle stack memory"), cl::Hidden, cl::init(true)); 96800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-use-after-return. 97800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClUseAfterReturn("asan-use-after-return", 98800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Check return-after-free"), cl::Hidden, cl::init(false)); 99800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-globals. 100800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClGlobals("asan-globals", 101800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle global objects"), cl::Hidden, cl::init(true)); 102800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClMemIntrin("asan-memintrin", 103800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle memset/memcpy/memmove"), cl::Hidden, cl::init(true)); 104800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -fasan-blacklist. 105800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClBlackListFile("asan-blacklist", 106800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("File containing the list of functions to ignore " 107800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "during instrumentation"), cl::Hidden); 108800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// These flags allow to change the shadow mapping. 110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The shadow mapping looks like 111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Shadow = (Mem >> scale) + (1 << offset_log) 112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingScale("asan-mapping-scale", 113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("scale of asan shadow mapping"), cl::Hidden, cl::init(0)); 114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingOffsetLog("asan-mapping-offset-log", 115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("offset of asan shadow mapping"), cl::Hidden, cl::init(-1)); 116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Optimization flags. Not user visible, used mostly for testing 118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// and benchmarking the tool. 119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOpt("asan-opt", 120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Optimize instrumentation"), cl::Hidden, cl::init(true)); 121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptSameTemp("asan-opt-same-temp", 122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Instrument the same temp just once"), cl::Hidden, 123800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(true)); 124800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptGlobals("asan-opt-globals", 125800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Don't instrument scalar globals"), cl::Hidden, cl::init(true)); 126800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Debug flags. 128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebug("asan-debug", cl::desc("debug"), cl::Hidden, 129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(0)); 130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugStack("asan-debug-stack", cl::desc("debug stack"), 131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(0)); 132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClDebugFunc("asan-debug-func", 133800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::desc("Debug func")); 134800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMin("asan-debug-min", cl::desc("Debug min inst"), 135800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 136800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMax("asan-debug-max", cl::desc("Debug man inst"), 137800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 138800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 139800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanynamespace { 140800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 141800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany/// AddressSanitizer: instrument the code in module to find memory bugs. 142800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystruct AddressSanitizer : public ModulePass { 143800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AddressSanitizer(); 14425878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko virtual const char *getPassName() const; 145800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void instrumentMop(Instruction *I); 146800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void instrumentAddress(Instruction *OrigIns, IRBuilder<> &IRB, 147800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, uint32_t TypeSize, bool IsWrite); 148800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *generateCrashCode(IRBuilder<> &IRB, Value *Addr, 149800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool IsWrite, uint32_t TypeSize); 150800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool instrumentMemIntrinsic(MemIntrinsic *MI); 151800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void instrumentMemIntrinsicParam(Instruction *OrigIns, Value *Addr, 152800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Size, 153800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore, bool IsWrite); 154800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *memToShadow(Value *Shadow, IRBuilder<> &IRB); 155800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool handleFunction(Module &M, Function &F); 156a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany bool maybeInsertAsanInitAtFunctionEntry(Function &F); 157800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool poisonStackInFunction(Module &M, Function &F); 158800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany virtual bool runOnModule(Module &M); 159800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool insertGlobalRedzones(Module &M); 160800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany static char ID; // Pass identification, replacement for typeid 161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 162800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 163800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 164800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAllocaSizeInBytes(AllocaInst *AI) { 165800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = AI->getAllocatedType(); 166d8313be41031e4d768f5b38199904d4debff88cdEvgeniy Stepanov uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 167800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return SizeInBytes; 168800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 169800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedSize(uint64_t SizeInBytes) { 170800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return ((SizeInBytes + RedzoneSize - 1) 171800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany / RedzoneSize) * RedzoneSize; 172800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 173800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedAllocaSize(AllocaInst *AI) { 174800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 175800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return getAlignedSize(SizeInBytes); 176800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 177800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 17855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *checkInterfaceFunction(Constant *FuncOrBitcast); 179800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, 180800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison); 1815a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany bool LooksLikeCodeInBug11395(Instruction *I); 182800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 183800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Module *CurrentModule; 184800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LLVMContext *C; 185800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TargetData *TD; 186800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t MappingOffset; 187800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int MappingScale; 188800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize; 189800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int LongSize; 190800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrTy; 191800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrPtrTy; 192800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanCtorFunction; 193800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanInitFunction; 194800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *CtorInsertBefore; 195a1c45044099cf7fb4a072f1326f164706d5bb2e2Kostya Serebryany OwningPtr<FunctionBlackList> BL; 196800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 197800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} // namespace 198800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 199800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanychar AddressSanitizer::ID = 0; 200800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyINITIALIZE_PASS(AddressSanitizer, "asan", 201800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs.", 202800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany false, false) 203800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyAddressSanitizer::AddressSanitizer() : ModulePass(ID) { } 204800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyModulePass *llvm::createAddressSanitizerPass() { 205800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new AddressSanitizer(); 206800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 207800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 20825878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenkoconst char *AddressSanitizer::getPassName() const { 20925878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko return "AddressSanitizer"; 21025878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko} 21125878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko 212800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Create a constant for Str so that we can pass it to the run-time lib. 213800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) { 21418c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str); 215800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new GlobalVariable(M, StrConst->getType(), true, 216800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::PrivateLinkage, StrConst, ""); 217800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 218800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 219800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Split the basic block and insert an if-then code. 220800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Before: 221800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Head 22256139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany// Cmp 223800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Tail 224800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// After: 225800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Head 226800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// if (Cmp) 22756139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany// ThenBlock 228800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Tail 229800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 23056139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany// Returns the ThenBlock's terminator. 23156139bc493790612ee6281630678e293be6b2eb2Kostya Serebryanystatic BranchInst *splitBlockAndInsertIfThen(Value *Cmp) { 23256139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Instruction *SplitBefore = cast<Instruction>(Cmp)->getNextNode(); 233800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *Head = SplitBefore->getParent(); 234800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *Tail = Head->splitBasicBlock(SplitBefore); 235800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TerminatorInst *HeadOldTerm = Head->getTerminator(); 23656139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany LLVMContext &C = Head->getParent()->getParent()->getContext(); 23756139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany BasicBlock *ThenBlock = BasicBlock::Create(C, "", Head->getParent()); 23856139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany BranchInst *HeadNewTerm = 23956139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany BranchInst::Create(/*ifTrue*/ThenBlock, /*ifFalse*/Tail, Cmp); 240800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ReplaceInstWithInst(HeadOldTerm, HeadNewTerm); 241800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 24256139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany BranchInst *CheckTerm = BranchInst::Create(Tail, ThenBlock); 243800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return CheckTerm; 244800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 245800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 246800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyValue *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) { 247800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Shadow >> scale 248800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Shadow = IRB.CreateLShr(Shadow, MappingScale); 249800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (MappingOffset == 0) 250800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Shadow; 251800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Shadow >> scale) | offset 252800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return IRB.CreateOr(Shadow, ConstantInt::get(IntptrTy, 253800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset)); 254800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 255800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 256800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentMemIntrinsicParam(Instruction *OrigIns, 257800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) { 258800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the first byte. 259800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 260800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 261800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(OrigIns, IRB, Addr, 8, IsWrite); 262800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 263800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the last byte. 264800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 265800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 266800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *SizeMinusOne = IRB.CreateSub( 267800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Size, ConstantInt::get(Size->getType(), 1)); 268800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SizeMinusOne = IRB.CreateIntCast(SizeMinusOne, IntptrTy, false); 269800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 270800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrPlusSizeMinisOne = IRB.CreateAdd(AddrLong, SizeMinusOne); 271800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(OrigIns, IRB, AddrPlusSizeMinisOne, 8, IsWrite); 272800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 273800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 274800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 275800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Instrument memset/memmove/memcpy 276800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::instrumentMemIntrinsic(MemIntrinsic *MI) { 277800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Dst = MI->getDest(); 278800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI); 279800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Src = MemTran ? MemTran->getSource() : NULL; 280800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Length = MI->getLength(); 281800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 282800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *ConstLength = dyn_cast<Constant>(Length); 283800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore = MI; 284800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength) { 285800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength->isNullValue()) return false; 286800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 287800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // The size is not a constant so it could be zero -- check at run-time. 288800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 289800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 290800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(Length, 29156139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Constant::getNullValue(Length->getType())); 29256139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany InsertBefore = splitBlockAndInsertIfThen(Cmp); 293800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 294800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 295800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsicParam(MI, Dst, Length, InsertBefore, true); 296800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Src) 297800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsicParam(MI, Src, Length, InsertBefore, false); 298800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 299800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 300800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 301e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// If I is an interesting memory access, return the PointerOperand 302e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// and set IsWrite. Otherwise return NULL. 303e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic Value *isInterestingMemoryAccess(Instruction *I, bool *IsWrite) { 304800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 305e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentReads) return NULL; 306e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = false; 307800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return LI->getPointerOperand(); 308800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 309e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (StoreInst *SI = dyn_cast<StoreInst>(I)) { 310e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentWrites) return NULL; 311e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 312e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return SI->getPointerOperand(); 313e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 314e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(I)) { 315e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 316e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 317e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return RMW->getPointerOperand(); 318e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 319e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicCmpXchgInst *XCHG = dyn_cast<AtomicCmpXchgInst>(I)) { 320e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 321e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 322e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return XCHG->getPointerOperand(); 323e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 324e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return NULL; 325800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 326800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 327800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentMop(Instruction *I) { 328e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 329e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany Value *Addr = isInterestingMemoryAccess(I, &IsWrite); 330e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany assert(Addr); 331800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptGlobals && isa<GlobalVariable>(Addr)) { 332800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We are accessing a global scalar variable. Nothing to catch here. 333800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 334800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 335800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigPtrTy = Addr->getType(); 336800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 337800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 338800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(OrigTy->isSized()); 339800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 340800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 341800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize != 8 && TypeSize != 16 && 342800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 343800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all unusual sizes. 344800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 345800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 346800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 347800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(I); 348800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(I, IRB, Addr, TypeSize, IsWrite); 349800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 350800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 35155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// Validate the result of Module::getOrInsertFunction called for an interface 35255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// function of AddressSanitizer. If the instrumented module defines a function 35355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// with the same name, their prototypes must match, otherwise 35455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// getOrInsertFunction returns a bitcast. 35555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander PotapenkoFunction *AddressSanitizer::checkInterfaceFunction(Constant *FuncOrBitcast) { 35655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast); 35755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko FuncOrBitcast->dump(); 35855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko report_fatal_error("trying to redefine an AddressSanitizer " 35955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko "interface function"); 36055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko} 36155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko 362800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyInstruction *AddressSanitizer::generateCrashCode( 363800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, bool IsWrite, uint32_t TypeSize) { 3643c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany // IsWrite and TypeSize are encoded in the function name. 3653c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany std::string FunctionName = std::string(kAsanReportErrorTemplate) + 3663c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany (IsWrite ? "store" : "load") + itostr(TypeSize / 8); 3673c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany Value *ReportWarningFunc = CurrentModule->getOrInsertFunction( 3683c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany FunctionName, IRB.getVoidTy(), IntptrTy, NULL); 3693c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany CallInst *Call = IRB.CreateCall(ReportWarningFunc, Addr); 3703c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany Call->setDoesNotReturn(); 3713c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany return Call; 372800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 373800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 374800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentAddress(Instruction *OrigIns, 375800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, 376800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize, bool IsWrite) { 377800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 378800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 379800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowTy = IntegerType::get( 380800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *C, std::max(8U, TypeSize >> MappingScale)); 381800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowPtrTy = PointerType::get(ShadowTy, 0); 382800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowPtr = memToShadow(AddrLong, IRB); 383800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *CmpVal = Constant::getNullValue(ShadowTy); 384800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowValue = IRB.CreateLoad( 385800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy)); 386800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 387800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal); 388800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 38956139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Instruction *CheckTerm = splitBlockAndInsertIfThen(Cmp); 390800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB2(CheckTerm); 391800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 392800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Granularity = 1 << MappingScale; 393800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize < 8 * Granularity) { 394800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Addr & (Granularity - 1) 3953f119989c3839c98b20bf6ea00c2ccc95aacff69Kostya Serebryany Value *LastAccessedByte = IRB2.CreateAnd( 396800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AddrLong, ConstantInt::get(IntptrTy, Granularity - 1)); 397800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Addr & (Granularity - 1)) + size - 1 3983f119989c3839c98b20bf6ea00c2ccc95aacff69Kostya Serebryany if (TypeSize / 8 > 1) 3993f119989c3839c98b20bf6ea00c2ccc95aacff69Kostya Serebryany LastAccessedByte = IRB2.CreateAdd( 4003f119989c3839c98b20bf6ea00c2ccc95aacff69Kostya Serebryany LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1)); 401800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (uint8_t) ((Addr & (Granularity-1)) + size - 1) 402800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LastAccessedByte = IRB2.CreateIntCast( 403800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LastAccessedByte, IRB.getInt8Ty(), false); 404800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue 405800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp2 = IRB2.CreateICmpSGE(LastAccessedByte, ShadowValue); 406800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 40756139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany CheckTerm = splitBlockAndInsertIfThen(Cmp2); 408800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 409800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 410800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB1(CheckTerm); 411800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Crash = generateCrashCode(IRB1, AddrLong, IsWrite, TypeSize); 412800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Crash->setDebugLoc(OrigIns->getDebugLoc()); 413cc1d856d8e8e11407b3c6c1d08768f77c3722e38Kostya Serebryany ReplaceInstWithInst(CheckTerm, new UnreachableInst(*C)); 414800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 415800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 416800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This function replaces all global variables with new variables that have 417800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// trailing redzones. It also creates a function that poisons 418800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// redzones and inserts this function into llvm.global_ctors. 419800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::insertGlobalRedzones(Module &M) { 420800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<GlobalVariable *, 16> GlobalsToChange; 421800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 422800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Module::GlobalListType::iterator G = M.getGlobalList().begin(), 423800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany E = M.getGlobalList().end(); G != E; ++G) { 424800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = cast<PointerType>(G->getType())->getElementType(); 425800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "GLOBAL: " << *G); 426800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 427800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!Ty->isSized()) continue; 428800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!G->hasInitializer()) continue; 4297cf2a04361e8613264498e50babe52d65c070473Kostya Serebryany // Touch only those globals that will not be defined in other modules. 4307cf2a04361e8613264498e50babe52d65c070473Kostya Serebryany // Don't handle ODR type linkages since other modules may be built w/o asan. 4312e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 4322e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany G->getLinkage() != GlobalVariable::PrivateLinkage && 4332e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany G->getLinkage() != GlobalVariable::InternalLinkage) 434800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 435d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // Two problems with thread-locals: 436d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // - The address of the main thread's copy can't be computed at link-time. 437d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // - Need to poison all copies, not just the main thread's one. 438d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany if (G->isThreadLocal()) 439d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany continue; 440800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For now, just ignore this Alloca if the alignment is large. 441800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (G->getAlignment() > RedzoneSize) continue; 442800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 443800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all the globals with the names starting with "\01L_OBJC_". 444800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Many of those are put into the .cstring section. The linker compresses 445800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // that section by removing the spare \0s after the string terminator, so 446800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // our redzones get broken. 447800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if ((G->getName().find("\01L_OBJC_") == 0) || 448800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (G->getName().find("\01l_OBJC_") == 0)) { 449800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G); 450800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 451800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 452800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 453800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (G->hasSection()) { 454800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Section(G->getSection()); 4558375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Ignore the globals from the __OBJC section. The ObjC runtime assumes 4568375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to 4578375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // them. 458800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if ((Section.find("__OBJC,") == 0) || 459800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Section.find("__DATA, __objc_") == 0)) { 460800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G); 461800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 462800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 4638375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // See http://code.google.com/p/address-sanitizer/issues/detail?id=32 4648375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Constant CFString instances are compiled in the following way: 4658375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // -- the string buffer is emitted into 4668375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // __TEXT,__cstring,cstring_literals 4678375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // -- the constant NSConstantString structure referencing that buffer 4688375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // is placed into __DATA,__cfstring 4698375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Therefore there's no point in placing redzones into __DATA,__cfstring. 4708375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Moreover, it causes the linker to crash on OS X 10.7 4718375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko if (Section.find("__DATA,__cfstring") == 0) { 4728375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko DEBUG(dbgs() << "Ignoring CFString: " << *G); 4738375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko continue; 4748375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko } 475800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 476800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 477800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalsToChange.push_back(G); 478800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 479800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 480800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t n = GlobalsToChange.size(); 481800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (n == 0) return false; 482800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 483800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A global is described by a structure 484800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t beg; 485800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size; 486800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size_with_redzone; 487800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // const char *name; 488800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We initialize an array of such structures and pass it to a run-time call. 489800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy, 490800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy, IntptrTy, NULL); 491800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Constant *, 16> Initializers(n); 492800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 493800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 494800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 495800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < n; i++) { 496800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *G = GlobalsToChange[i]; 497800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PointerType *PtrTy = cast<PointerType>(G->getType()); 498800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = PtrTy->getElementType(); 499208a4ff2b56f453910bb817540f34b8169f7702aKostya Serebryany uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 500800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t RightRedzoneSize = RedzoneSize + 501800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (RedzoneSize - (SizeInBytes % RedzoneSize)); 502800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize); 503800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 504800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL); 505800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *NewInitializer = ConstantStruct::get( 506800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewTy, G->getInitializer(), 507800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(RightRedZoneTy), NULL); 508800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 509a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany SmallString<2048> DescriptionOfGlobal = G->getName(); 510a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += " ("; 511a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += M.getModuleIdentifier(); 512a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += ")"; 513a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal); 514800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 515800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Create a new global variable with enough space for a redzone. 516800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *NewGlobal = new GlobalVariable( 517800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, NewTy, G->isConstant(), G->getLinkage(), 518ce718ff9f42c7da092eaa01dd0242e8d5ba84713Hans Wennborg NewInitializer, "", G, G->getThreadLocalMode()); 519800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->copyAttributesFrom(G); 520800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->setAlignment(RedzoneSize); 521800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 522800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Indices2[2]; 523800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[0] = IRB.getInt32(0); 524800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[1] = IRB.getInt32(0); 525800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 526800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->replaceAllUsesWith( 527f1639abf1aaba1448f719f595156cd0f4cd560ccKostya Serebryany ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true)); 528800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->takeName(G); 529800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->eraseFromParent(); 530800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 531800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Initializers[i] = ConstantStruct::get( 532800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalStructTy, 533800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(NewGlobal, IntptrTy), 534800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes), 535800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize), 536800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(Name, IntptrTy), 537800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NULL); 538800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "NEW GLOBAL:\n" << *NewGlobal); 539800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 540800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 541800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n); 542800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *AllGlobals = new GlobalVariable( 543800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage, 544800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantArray::get(ArrayOfGlobalStructTy, Initializers), ""); 545800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 54655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanRegisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 547800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanRegisterGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 548800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanRegisterGlobals->setLinkage(Function::ExternalLinkage); 549800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 550800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall2(AsanRegisterGlobals, 551800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 552800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, n)); 553800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5547bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // We also need to unregister globals at the end, e.g. when a shared library 5557bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // gets closed. 5567bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanDtorFunction = Function::Create( 5577bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 5587bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleDtorName, &M); 5597bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction); 5607bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB)); 56155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanUnregisterGlobals = 56255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko checkInterfaceFunction(M.getOrInsertFunction( 56355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko kAsanUnregisterGlobalsName, 56455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 5657bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage); 5667bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 5677bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB_Dtor.CreateCall2(AsanUnregisterGlobals, 5687bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 5697bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany ConstantInt::get(IntptrTy, n)); 5707bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalDtors(M, AsanDtorFunction, kAsanCtorAndCtorPriority); 5717bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 572800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << M); 573800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 574800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 575800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 576800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// virtual 577800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::runOnModule(Module &M) { 578800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Initialize the private fields. No one has accessed them before. 579800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TD = getAnalysisIfAvailable<TargetData>(); 580800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TD) 581800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 582a1c45044099cf7fb4a072f1326f164706d5bb2e2Kostya Serebryany BL.reset(new FunctionBlackList(ClBlackListFile)); 583800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 584800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CurrentModule = &M; 585800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany C = &(M.getContext()); 586800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LongSize = TD->getPointerSizeInBits(); 587800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy = Type::getIntNTy(*C, LongSize); 588800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrPtrTy = PointerType::get(IntptrTy, 0); 589800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 590800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanCtorFunction = Function::Create( 591800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 592800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::InternalLinkage, kAsanModuleCtorName, &M); 593800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction); 594800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CtorInsertBefore = ReturnInst::Create(*C, AsanCtorBB); 595800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 596800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // call __asan_init in the module ctor. 597800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 59855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko AsanInitFunction = checkInterfaceFunction( 599800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL)); 600800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanInitFunction->setLinkage(Function::ExternalLinkage); 601800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall(AsanInitFunction); 602800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 60306fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov llvm::Triple targetTriple(M.getTargetTriple()); 60406fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov bool isAndroid = targetTriple.getEnvironment() == llvm::Triple::ANDROIDEABI; 60506fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov 60606fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov MappingOffset = isAndroid ? kDefaultShadowOffsetAndroid : 60706fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov (LongSize == 32 ? kDefaultShadowOffset32 : kDefaultShadowOffset64); 608800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog >= 0) { 609800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog == 0) { 610800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // special case 611800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 0; 612800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 613800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 1ULL << ClMappingOffsetLog; 614800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 615800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 616800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = kDefaultShadowScale; 617800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingScale) { 618800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = ClMappingScale; 619800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 620800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Redzone used for stack and globals is at least 32 bytes. 621800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively. 622800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize = std::max(32, (int)(1 << MappingScale)); 623800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 624800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool Res = false; 625800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 626800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClGlobals) 627800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Res |= insertGlobalRedzones(M); 628800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6298c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingOffsetLog >= 0) { 6308c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Tell the run-time the current values of mapping offset and scale. 6318c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_offset = 6328c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 6338c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingOffset), 6348c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingOffsetName); 6358c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 6368c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_offset, true); 6378c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 6388c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingScale) { 6398c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_scale = 6408c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 6418c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingScale), 6428c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingScaleName); 6438c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 6448c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_scale, true); 6458c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 646800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 647800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 648800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) { 649800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (F->isDeclaration()) continue; 650800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Res |= handleFunction(M, *F); 651800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 652800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6537bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority); 6549b02741d2284d9516a59666c211fe1f57e8803adKostya Serebryany 655800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Res; 656800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 657800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 658a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryanybool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) { 659a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // For each NSObject descendant having a +load method, this method is invoked 660a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // by the ObjC runtime before any of the static constructors is called. 661a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // Therefore we need to instrument such methods with a call to __asan_init 662a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // at the beginning in order to initialize our runtime before any access to 663a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // the shadow memory. 664a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // We cannot just ignore these methods, because they may call other 665a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // instrumented functions. 666a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany if (F.getName().find(" load]") != std::string::npos) { 667a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRBuilder<> IRB(F.begin()->begin()); 668a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRB.CreateCall(AsanInitFunction); 669a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return true; 670a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany } 671a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return false; 672a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany} 673a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 674800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::handleFunction(Module &M, Function &F) { 675800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (BL->isIn(F)) return false; 676800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (&F == AsanCtorFunction) return false; 677a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 678a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // If needed, insert __asan_init before checking for AddressSafety attr. 679a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany maybeInsertAsanInitAtFunctionEntry(F); 680a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 6810307b9a88574d7e54459181afaa656ac92971847Kostya Serebryany if (!F.hasFnAttr(Attribute::AddressSafety)) return false; 682800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 683800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClDebugFunc.empty() && ClDebugFunc != F.getName()) 684800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 685800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We want to instrument every address only once per basic block 686800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (unless there are calls between uses). 687800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallSet<Value*, 16> TempsToInstrument; 688800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 16> ToInstrument; 68995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany SmallVector<Instruction*, 8> NoReturnCalls; 690e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 691800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 692800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Fill the set of memory operations to instrument. 693800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 694800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 695800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 696324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany int NumInsnsPerBB = 0; 697800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); 698800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 699bcb55ce3862bbbedac4e09d7099c9e0efc434e4bKostya Serebryany if (LooksLikeCodeInBug11395(BI)) return false; 700e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (Value *Addr = isInterestingMemoryAccess(BI, &IsWrite)) { 701800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptSameTemp) { 702800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TempsToInstrument.insert(Addr)) 703800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; // We've seen this temp in the current BB. 704800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 705800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (isa<MemIntrinsic>(BI) && ClMemIntrin) { 706800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ok, take it. 707800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 70895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CallInst *CI = dyn_cast<CallInst>(BI)) { 709800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A call inside BB. 710800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 71195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CI->doesNotReturn()) { 71295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany NoReturnCalls.push_back(CI); 71395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 714800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 715800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 716800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 717800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ToInstrument.push_back(BI); 718324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany NumInsnsPerBB++; 719324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany if (NumInsnsPerBB >= ClMaxInsnsToInstrumentPerBB) 720324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany break; 721800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 722800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 723800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 724800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Instrument. 725800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int NumInstrumented = 0; 726800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = ToInstrument.size(); i != n; i++) { 727800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Inst = ToInstrument[i]; 728800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugMin < 0 || ClDebugMax < 0 || 729800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) { 730e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (isInterestingMemoryAccess(Inst, &IsWrite)) 731800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMop(Inst); 732800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany else 733800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsic(cast<MemIntrinsic>(Inst)); 734800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 735800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NumInstrumented++; 736800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 737800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 738800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 739800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 740800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool ChangedStack = poisonStackInFunction(M, F); 74195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 74295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // We must unpoison the stack before every NoReturn call (throw, _exit, etc). 74395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37 74495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) { 74595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany Instruction *CI = NoReturnCalls[i]; 74695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRBuilder<> IRB(CI); 74795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRB.CreateCall(M.getOrInsertFunction(kAsanHandleNoReturnName, 74895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRB.getVoidTy(), NULL)); 74995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 75095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 75195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty(); 752800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 753800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 754800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) { 755800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 1) return PoisonByte; 756800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 2) return (PoisonByte << 8) + PoisonByte; 757800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 4) 758800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return (PoisonByte << 24) + (PoisonByte << 16) + 759800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (PoisonByte << 8) + (PoisonByte); 760858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper llvm_unreachable("ShadowRedzoneSize is either 1, 2 or 4"); 761800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 762800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 763800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic void PoisonShadowPartialRightRedzone(uint8_t *Shadow, 764800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Size, 765800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize, 766800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowGranularity, 767800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint8_t Magic) { 768800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < RedzoneSize; 769800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany i+= ShadowGranularity, Shadow++) { 770800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (i + ShadowGranularity <= Size) { 771800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = 0; // fully addressable 772800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (i >= Size) { 773800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Magic; // unaddressable 774800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 775800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Size - i; // first Size-i bytes are addressable 776800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 777800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 778800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 779800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 780800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, 781800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB, 782800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison) { 783800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowRZSize = RedzoneSize >> MappingScale; 784800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowRZSize >= 1 && ShadowRZSize <= 4); 785800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8); 786800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZPtrTy = PointerType::get(RZTy, 0); 787800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 788800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonLeft = ConstantInt::get(RZTy, 789800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackLeftRedzoneMagic : 0LL, ShadowRZSize)); 790800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonMid = ConstantInt::get(RZTy, 791800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackMidRedzoneMagic : 0LL, ShadowRZSize)); 792800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonRight = ConstantInt::get(RZTy, 793800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackRightRedzoneMagic : 0LL, ShadowRZSize)); 794800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 795800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison the first red zone. 796800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy)); 797800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 798800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison all other red zones. 799800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 800800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 801800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 802800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 803800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 804800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(AlignedSize - SizeInBytes < RedzoneSize); 805800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Ptr = NULL; 806800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 807800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize; 808800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 809800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowBase->getType() == IntptrTy); 810800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (SizeInBytes < AlignedSize) { 811800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the partial redzone at right 812800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd( 813800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ShadowBase, ConstantInt::get(IntptrTy, 814800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Pos >> MappingScale) - ShadowRZSize)); 815800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t AddressableBytes = RedzoneSize - (AlignedSize - SizeInBytes); 816800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t Poison = 0; 817800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoPoison) { 818800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes, 819800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize, 820800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1ULL << MappingScale, 821800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackPartialRedzoneMagic); 822800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 823800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PartialPoison = ConstantInt::get(RZTy, Poison); 824800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PartialPoison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 825800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 826800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 827800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the full redzone at right. 828800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd(ShadowBase, 829800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, Pos >> MappingScale)); 830800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Poison = i == AllocaVec.size() - 1 ? PoisonRight : PoisonMid; 831800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 832800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 833800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += RedzoneSize; 834800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 835800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 836800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8375a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// Workaround for bug 11395: we don't want to instrument stack in functions 8385a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// with large assembly blobs (32-bit only), otherwise reg alloc may crash. 839d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany// FIXME: remove once the bug 11395 is fixed. 8405a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryanybool AddressSanitizer::LooksLikeCodeInBug11395(Instruction *I) { 8415a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (LongSize != 32) return false; 8425a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany CallInst *CI = dyn_cast<CallInst>(I); 8435a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (!CI || !CI->isInlineAsm()) return false; 8445a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (CI->getNumArgOperands() <= 5) return false; 8455a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany // We have inline assembly with quite a few arguments. 8465a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany return true; 8475a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany} 8485a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany 849800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Find all static Alloca instructions and put 850800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// poisoned red zones around all of them. 851800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Then unpoison everything back before the function returns. 852800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 853800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Stack poisoning does not play well with exception handling. 854800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// When an exception is thrown, we essentially bypass the code 855800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// that unpoisones the stack. This is why the run-time library has 856800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// to intercept __cxa_throw (as well as longjmp, etc) and unpoison the entire 857800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// stack in the interceptor. This however does not work inside the 858800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// actual function which catches the exception. Most likely because the 859800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// compiler hoists the load of the shadow value somewhere too high. 860800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This causes asan to report a non-existing bug on 453.povray. 861800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// It sounds like an LLVM bug. 862800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::poisonStackInFunction(Module &M, Function &F) { 863800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClStack) return false; 864800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<AllocaInst*, 16> AllocaVec; 865800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 8> RetVec; 866800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t TotalSize = 0; 867800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 868800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Filter out Alloca instructions we want (and can) handle. 869800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Collect Ret instructions. 870800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 871800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 872800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock &BB = *FI; 873800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = BB.begin(), BE = BB.end(); 874800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 875800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (isa<ReturnInst>(BI)) { 876800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RetVec.push_back(BI); 877800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 878800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 879800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 880800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = dyn_cast<AllocaInst>(BI); 881800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI) continue; 882800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->isArrayAllocation()) continue; 883800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->isStaticAlloca()) continue; 884800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->getAllocatedType()->isSized()) continue; 885800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->getAlignment() > RedzoneSize) continue; 886800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaVec.push_back(AI); 887800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 888800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TotalSize += AlignedSize; 889800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 890800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 891800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 892800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AllocaVec.empty()) return false; 893800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 894800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t LocalStackSize = TotalSize + (AllocaVec.size() + 1) * RedzoneSize; 895800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 896800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool DoStackMalloc = ClUseAfterReturn 897800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany && LocalStackSize <= kMaxStackMallocSize; 898800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 899800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsBefore = AllocaVec[0]; 900800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsBefore); 901800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 902800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 903800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize); 904800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *MyAlloca = 905800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore); 906800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MyAlloca->setAlignment(RedzoneSize); 907800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(MyAlloca->isStaticAlloca()); 908800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy); 909800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LocalStackBase = OrigStackBase; 910800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 911800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 912800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AsanStackMallocFunc = M.getOrInsertFunction( 913800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL); 914800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc, 915800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase); 916800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 917800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 918800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // This string will be parsed by the run-time (DescribeStackAddress). 919800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallString<2048> StackDescriptionStorage; 920800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany raw_svector_ostream StackDescription(StackDescriptionStorage); 921800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << F.getName() << " " << AllocaVec.size() << " "; 922800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 923800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 924800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Replace Alloca instructions with base+offset. 925800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 926800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 927800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 928800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Name = AI->getName(); 929800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << Pos << " " << SizeInBytes << " " 930800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany << Name.size() << " " << Name << " "; 931800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 932800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert((AlignedSize % RedzoneSize) == 0); 933800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->replaceAllUsesWith( 934800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr( 935800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)), 936800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->getType())); 937800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize + RedzoneSize; 938800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 939800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(Pos == LocalStackSize); 940800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 941800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Write the Magic value and the frame description constant to the redzone. 942800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus0 = IRB.CreateIntToPtr(LocalStackBase, IntptrPtrTy); 943800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(ConstantInt::get(IntptrTy, kCurrentStackFrameMagic), 944800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 945800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus1 = IRB.CreateAdd(LocalStackBase, 946800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LongSize/8)); 947800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy); 948800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Description = IRB.CreatePointerCast( 949800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany createPrivateGlobalForString(M, StackDescription.str()), 950800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy); 951800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Description, BasePlus1); 952800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 953800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the stack redzones at the entry. 954800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase = memToShadow(LocalStackBase, IRB); 955800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRB, ShadowBase, true); 956800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 957800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AsanStackFreeFunc = NULL; 958800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 959800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanStackFreeFunc = M.getOrInsertFunction( 960800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackFreeName, IRB.getVoidTy(), 961800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy, IntptrTy, IntptrTy, NULL); 962800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 963800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 964800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack before all ret instructions. 965800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = RetVec.size(); i < n; i++) { 966800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Ret = RetVec[i]; 967800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRBRet(Ret); 968800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 969800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Mark the current frame as retired. 970800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateStore(ConstantInt::get(IntptrTy, kRetiredStackFrameMagic), 971800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 972800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack. 973800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRBRet, ShadowBase, false); 974800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 975800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 976800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateCall3(AsanStackFreeFunc, LocalStackBase, 977800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), 978800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OrigStackBase); 979800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 980800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 981800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 982800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugStack) { 983800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 984800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 985800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 986800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 987800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 988