AddressSanitizer.cpp revision 06cb8ed00696eb14d1b831921452e50ec0568ea2
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 BranchInst *splitBlockAndInsertIfThen(Instruction *SplitBefore, Value *Cmp); 161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany static char ID; // Pass identification, replacement for typeid 162800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 163800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 164800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 165800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAllocaSizeInBytes(AllocaInst *AI) { 166800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = AI->getAllocatedType(); 167d8313be41031e4d768f5b38199904d4debff88cdEvgeniy Stepanov uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 168800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return SizeInBytes; 169800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 170800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedSize(uint64_t SizeInBytes) { 171800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return ((SizeInBytes + RedzoneSize - 1) 172800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany / RedzoneSize) * RedzoneSize; 173800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 174800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedAllocaSize(AllocaInst *AI) { 175800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 176800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return getAlignedSize(SizeInBytes); 177800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 178800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 17955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *checkInterfaceFunction(Constant *FuncOrBitcast); 180800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, 181800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison); 1825a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany bool LooksLikeCodeInBug11395(Instruction *I); 183800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 184800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Module *CurrentModule; 185800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LLVMContext *C; 186800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TargetData *TD; 187800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t MappingOffset; 188800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int MappingScale; 189800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize; 190800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int LongSize; 191800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrTy; 192800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrPtrTy; 193800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanCtorFunction; 194800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanInitFunction; 195800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *CtorInsertBefore; 196a1c45044099cf7fb4a072f1326f164706d5bb2e2Kostya Serebryany OwningPtr<FunctionBlackList> BL; 197800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 198800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} // namespace 199800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 200800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanychar AddressSanitizer::ID = 0; 201800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyINITIALIZE_PASS(AddressSanitizer, "asan", 202800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs.", 203800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany false, false) 204800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyAddressSanitizer::AddressSanitizer() : ModulePass(ID) { } 205800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyModulePass *llvm::createAddressSanitizerPass() { 206800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new AddressSanitizer(); 207800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 208800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 20925878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenkoconst char *AddressSanitizer::getPassName() const { 21025878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko return "AddressSanitizer"; 21125878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko} 21225878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko 213800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Create a constant for Str so that we can pass it to the run-time lib. 214800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) { 21518c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str); 216800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new GlobalVariable(M, StrConst->getType(), true, 217800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::PrivateLinkage, StrConst, ""); 218800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 219800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 220800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Split the basic block and insert an if-then code. 221800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Before: 222800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Head 223800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// SplitBefore 224800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Tail 225800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// After: 226800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Head 227800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// if (Cmp) 228800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// NewBasicBlock 229800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// SplitBefore 230800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Tail 231800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 232800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Returns the NewBasicBlock's terminator. 233800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyBranchInst *AddressSanitizer::splitBlockAndInsertIfThen( 234800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *SplitBefore, Value *Cmp) { 235800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *Head = SplitBefore->getParent(); 236800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *Tail = Head->splitBasicBlock(SplitBefore); 237800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TerminatorInst *HeadOldTerm = Head->getTerminator(); 238800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *NewBasicBlock = 239800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock::Create(*C, "", Head->getParent()); 240800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BranchInst *HeadNewTerm = BranchInst::Create(/*ifTrue*/NewBasicBlock, 241800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany /*ifFalse*/Tail, 242800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Cmp); 243800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ReplaceInstWithInst(HeadOldTerm, HeadNewTerm); 244800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 245800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BranchInst *CheckTerm = BranchInst::Create(Tail, NewBasicBlock); 246800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return CheckTerm; 247800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 248800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 249800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyValue *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) { 250800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Shadow >> scale 251800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Shadow = IRB.CreateLShr(Shadow, MappingScale); 252800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (MappingOffset == 0) 253800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Shadow; 254800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Shadow >> scale) | offset 255800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return IRB.CreateOr(Shadow, ConstantInt::get(IntptrTy, 256800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset)); 257800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 258800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 259800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentMemIntrinsicParam(Instruction *OrigIns, 260800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) { 261800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the first byte. 262800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 263800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 264800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(OrigIns, IRB, Addr, 8, IsWrite); 265800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 266800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the last byte. 267800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 268800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 269800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *SizeMinusOne = IRB.CreateSub( 270800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Size, ConstantInt::get(Size->getType(), 1)); 271800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SizeMinusOne = IRB.CreateIntCast(SizeMinusOne, IntptrTy, false); 272800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 273800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrPlusSizeMinisOne = IRB.CreateAdd(AddrLong, SizeMinusOne); 274800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(OrigIns, IRB, AddrPlusSizeMinisOne, 8, IsWrite); 275800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 276800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 277800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 278800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Instrument memset/memmove/memcpy 279800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::instrumentMemIntrinsic(MemIntrinsic *MI) { 280800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Dst = MI->getDest(); 281800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI); 282800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Src = MemTran ? MemTran->getSource() : NULL; 283800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Length = MI->getLength(); 284800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 285800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *ConstLength = dyn_cast<Constant>(Length); 286800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore = MI; 287800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength) { 288800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength->isNullValue()) return false; 289800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 290800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // The size is not a constant so it could be zero -- check at run-time. 291800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 292800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 293800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(Length, 294800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(Length->getType())); 295800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany InsertBefore = splitBlockAndInsertIfThen(InsertBefore, Cmp); 296800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 297800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 298800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsicParam(MI, Dst, Length, InsertBefore, true); 299800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Src) 300800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsicParam(MI, Src, Length, InsertBefore, false); 301800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 302800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 303800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 304e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// If I is an interesting memory access, return the PointerOperand 305e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// and set IsWrite. Otherwise return NULL. 306e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic Value *isInterestingMemoryAccess(Instruction *I, bool *IsWrite) { 307800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 308e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentReads) return NULL; 309e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = false; 310800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return LI->getPointerOperand(); 311800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 312e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (StoreInst *SI = dyn_cast<StoreInst>(I)) { 313e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentWrites) return NULL; 314e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 315e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return SI->getPointerOperand(); 316e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 317e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(I)) { 318e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 319e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 320e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return RMW->getPointerOperand(); 321e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 322e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicCmpXchgInst *XCHG = dyn_cast<AtomicCmpXchgInst>(I)) { 323e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 324e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 325e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return XCHG->getPointerOperand(); 326e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 327e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return NULL; 328800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 329800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 330800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentMop(Instruction *I) { 331e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 332e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany Value *Addr = isInterestingMemoryAccess(I, &IsWrite); 333e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany assert(Addr); 334800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptGlobals && isa<GlobalVariable>(Addr)) { 335800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We are accessing a global scalar variable. Nothing to catch here. 336800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 337800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 338800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigPtrTy = Addr->getType(); 339800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 340800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 341800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(OrigTy->isSized()); 342800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 343800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 344800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize != 8 && TypeSize != 16 && 345800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 346800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all unusual sizes. 347800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 348800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 349800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 350800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(I); 351800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentAddress(I, IRB, Addr, TypeSize, IsWrite); 352800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 353800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 35455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// Validate the result of Module::getOrInsertFunction called for an interface 35555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// function of AddressSanitizer. If the instrumented module defines a function 35655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// with the same name, their prototypes must match, otherwise 35755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// getOrInsertFunction returns a bitcast. 35855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander PotapenkoFunction *AddressSanitizer::checkInterfaceFunction(Constant *FuncOrBitcast) { 35955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast); 36055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko FuncOrBitcast->dump(); 36155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko report_fatal_error("trying to redefine an AddressSanitizer " 36255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko "interface function"); 36355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko} 36455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko 365800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyInstruction *AddressSanitizer::generateCrashCode( 366800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, bool IsWrite, uint32_t TypeSize) { 3673c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany // IsWrite and TypeSize are encoded in the function name. 3683c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany std::string FunctionName = std::string(kAsanReportErrorTemplate) + 3693c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany (IsWrite ? "store" : "load") + itostr(TypeSize / 8); 3703c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany Value *ReportWarningFunc = CurrentModule->getOrInsertFunction( 3713c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany FunctionName, IRB.getVoidTy(), IntptrTy, NULL); 3723c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany CallInst *Call = IRB.CreateCall(ReportWarningFunc, Addr); 3733c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany Call->setDoesNotReturn(); 3743c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany return Call; 375800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 376800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 377800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::instrumentAddress(Instruction *OrigIns, 378800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, 379800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize, bool IsWrite) { 380800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 381800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 382800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowTy = IntegerType::get( 383800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *C, std::max(8U, TypeSize >> MappingScale)); 384800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowPtrTy = PointerType::get(ShadowTy, 0); 385800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowPtr = memToShadow(AddrLong, IRB); 386800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *CmpVal = Constant::getNullValue(ShadowTy); 387800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowValue = IRB.CreateLoad( 388800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy)); 389800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 390800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal); 391800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 392800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *CheckTerm = splitBlockAndInsertIfThen( 393800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cast<Instruction>(Cmp)->getNextNode(), Cmp); 394800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB2(CheckTerm); 395800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 396800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Granularity = 1 << MappingScale; 397800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize < 8 * Granularity) { 398800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Addr & (Granularity - 1) 3993f119989c3839c98b20bf6ea00c2ccc95aacff69Kostya Serebryany Value *LastAccessedByte = IRB2.CreateAnd( 400800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AddrLong, ConstantInt::get(IntptrTy, Granularity - 1)); 401800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Addr & (Granularity - 1)) + size - 1 4023f119989c3839c98b20bf6ea00c2ccc95aacff69Kostya Serebryany if (TypeSize / 8 > 1) 4033f119989c3839c98b20bf6ea00c2ccc95aacff69Kostya Serebryany LastAccessedByte = IRB2.CreateAdd( 4043f119989c3839c98b20bf6ea00c2ccc95aacff69Kostya Serebryany LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1)); 405800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (uint8_t) ((Addr & (Granularity-1)) + size - 1) 406800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LastAccessedByte = IRB2.CreateIntCast( 407800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LastAccessedByte, IRB.getInt8Ty(), false); 408800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue 409800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp2 = IRB2.CreateICmpSGE(LastAccessedByte, ShadowValue); 410800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 411800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CheckTerm = splitBlockAndInsertIfThen(CheckTerm, Cmp2); 412800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 413800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 414800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB1(CheckTerm); 415800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Crash = generateCrashCode(IRB1, AddrLong, IsWrite, TypeSize); 416800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Crash->setDebugLoc(OrigIns->getDebugLoc()); 417cc1d856d8e8e11407b3c6c1d08768f77c3722e38Kostya Serebryany ReplaceInstWithInst(CheckTerm, new UnreachableInst(*C)); 418800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 419800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 420800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This function replaces all global variables with new variables that have 421800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// trailing redzones. It also creates a function that poisons 422800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// redzones and inserts this function into llvm.global_ctors. 423800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::insertGlobalRedzones(Module &M) { 424800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<GlobalVariable *, 16> GlobalsToChange; 425800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 426800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Module::GlobalListType::iterator G = M.getGlobalList().begin(), 427800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany E = M.getGlobalList().end(); G != E; ++G) { 428800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = cast<PointerType>(G->getType())->getElementType(); 429800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "GLOBAL: " << *G); 430800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 431800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!Ty->isSized()) continue; 432800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!G->hasInitializer()) continue; 4337cf2a04361e8613264498e50babe52d65c070473Kostya Serebryany // Touch only those globals that will not be defined in other modules. 4347cf2a04361e8613264498e50babe52d65c070473Kostya Serebryany // Don't handle ODR type linkages since other modules may be built w/o asan. 4352e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 4362e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany G->getLinkage() != GlobalVariable::PrivateLinkage && 4372e7fb2f73641f1f1ca385fe7777075945bf4ca24Kostya Serebryany G->getLinkage() != GlobalVariable::InternalLinkage) 438800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 439d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // Two problems with thread-locals: 440d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // - The address of the main thread's copy can't be computed at link-time. 441d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany // - Need to poison all copies, not just the main thread's one. 442d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany if (G->isThreadLocal()) 443d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany continue; 444800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For now, just ignore this Alloca if the alignment is large. 445800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (G->getAlignment() > RedzoneSize) continue; 446800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 447800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all the globals with the names starting with "\01L_OBJC_". 448800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Many of those are put into the .cstring section. The linker compresses 449800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // that section by removing the spare \0s after the string terminator, so 450800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // our redzones get broken. 451800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if ((G->getName().find("\01L_OBJC_") == 0) || 452800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (G->getName().find("\01l_OBJC_") == 0)) { 453800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G); 454800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 455800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 456800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 457800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (G->hasSection()) { 458800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Section(G->getSection()); 4598375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Ignore the globals from the __OBJC section. The ObjC runtime assumes 4608375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to 4618375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // them. 462800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if ((Section.find("__OBJC,") == 0) || 463800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Section.find("__DATA, __objc_") == 0)) { 464800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G); 465800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 466800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 4678375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // See http://code.google.com/p/address-sanitizer/issues/detail?id=32 4688375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Constant CFString instances are compiled in the following way: 4698375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // -- the string buffer is emitted into 4708375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // __TEXT,__cstring,cstring_literals 4718375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // -- the constant NSConstantString structure referencing that buffer 4728375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // is placed into __DATA,__cfstring 4738375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Therefore there's no point in placing redzones into __DATA,__cfstring. 4748375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko // Moreover, it causes the linker to crash on OS X 10.7 4758375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko if (Section.find("__DATA,__cfstring") == 0) { 4768375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko DEBUG(dbgs() << "Ignoring CFString: " << *G); 4778375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko continue; 4788375bc923638299410e75e8f668524fc1aa113bdAlexander Potapenko } 479800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 480800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 481800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalsToChange.push_back(G); 482800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 483800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 484800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t n = GlobalsToChange.size(); 485800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (n == 0) return false; 486800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 487800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A global is described by a structure 488800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t beg; 489800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size; 490800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size_with_redzone; 491800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // const char *name; 492800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We initialize an array of such structures and pass it to a run-time call. 493800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy, 494800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy, IntptrTy, NULL); 495800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Constant *, 16> Initializers(n); 496800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 497800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 498800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 499800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < n; i++) { 500800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *G = GlobalsToChange[i]; 501800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PointerType *PtrTy = cast<PointerType>(G->getType()); 502800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = PtrTy->getElementType(); 503208a4ff2b56f453910bb817540f34b8169f7702aKostya Serebryany uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 504800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t RightRedzoneSize = RedzoneSize + 505800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (RedzoneSize - (SizeInBytes % RedzoneSize)); 506800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize); 507800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 508800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL); 509800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *NewInitializer = ConstantStruct::get( 510800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewTy, G->getInitializer(), 511800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(RightRedZoneTy), NULL); 512800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 513a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany SmallString<2048> DescriptionOfGlobal = G->getName(); 514a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += " ("; 515a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += M.getModuleIdentifier(); 516a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += ")"; 517a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal); 518800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 519800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Create a new global variable with enough space for a redzone. 520800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *NewGlobal = new GlobalVariable( 521800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, NewTy, G->isConstant(), G->getLinkage(), 522ce718ff9f42c7da092eaa01dd0242e8d5ba84713Hans Wennborg NewInitializer, "", G, G->getThreadLocalMode()); 523800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->copyAttributesFrom(G); 524800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->setAlignment(RedzoneSize); 525800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 526800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Indices2[2]; 527800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[0] = IRB.getInt32(0); 528800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[1] = IRB.getInt32(0); 529800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 530800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->replaceAllUsesWith( 531f1639abf1aaba1448f719f595156cd0f4cd560ccKostya Serebryany ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true)); 532800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->takeName(G); 533800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->eraseFromParent(); 534800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 535800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Initializers[i] = ConstantStruct::get( 536800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalStructTy, 537800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(NewGlobal, IntptrTy), 538800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes), 539800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize), 540800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(Name, IntptrTy), 541800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NULL); 542800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "NEW GLOBAL:\n" << *NewGlobal); 543800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 544800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 545800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n); 546800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *AllGlobals = new GlobalVariable( 547800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage, 548800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantArray::get(ArrayOfGlobalStructTy, Initializers), ""); 549800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 55055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanRegisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 551800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanRegisterGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 552800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanRegisterGlobals->setLinkage(Function::ExternalLinkage); 553800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 554800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall2(AsanRegisterGlobals, 555800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 556800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, n)); 557800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5587bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // We also need to unregister globals at the end, e.g. when a shared library 5597bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // gets closed. 5607bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanDtorFunction = Function::Create( 5617bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 5627bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleDtorName, &M); 5637bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction); 5647bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB)); 56555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanUnregisterGlobals = 56655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko checkInterfaceFunction(M.getOrInsertFunction( 56755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko kAsanUnregisterGlobalsName, 56855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 5697bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage); 5707bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 5717bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB_Dtor.CreateCall2(AsanUnregisterGlobals, 5727bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 5737bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany ConstantInt::get(IntptrTy, n)); 5747bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalDtors(M, AsanDtorFunction, kAsanCtorAndCtorPriority); 5757bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 576800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << M); 577800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 578800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 579800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 580800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// virtual 581800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::runOnModule(Module &M) { 582800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Initialize the private fields. No one has accessed them before. 583800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TD = getAnalysisIfAvailable<TargetData>(); 584800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TD) 585800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 586a1c45044099cf7fb4a072f1326f164706d5bb2e2Kostya Serebryany BL.reset(new FunctionBlackList(ClBlackListFile)); 587800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 588800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CurrentModule = &M; 589800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany C = &(M.getContext()); 590800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LongSize = TD->getPointerSizeInBits(); 591800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy = Type::getIntNTy(*C, LongSize); 592800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrPtrTy = PointerType::get(IntptrTy, 0); 593800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 594800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanCtorFunction = Function::Create( 595800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 596800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::InternalLinkage, kAsanModuleCtorName, &M); 597800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction); 598800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CtorInsertBefore = ReturnInst::Create(*C, AsanCtorBB); 599800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 600800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // call __asan_init in the module ctor. 601800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 60255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko AsanInitFunction = checkInterfaceFunction( 603800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL)); 604800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanInitFunction->setLinkage(Function::ExternalLinkage); 605800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall(AsanInitFunction); 606800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 60706fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov llvm::Triple targetTriple(M.getTargetTriple()); 60806fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov bool isAndroid = targetTriple.getEnvironment() == llvm::Triple::ANDROIDEABI; 60906fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov 61006fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov MappingOffset = isAndroid ? kDefaultShadowOffsetAndroid : 61106fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov (LongSize == 32 ? kDefaultShadowOffset32 : kDefaultShadowOffset64); 612800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog >= 0) { 613800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog == 0) { 614800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // special case 615800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 0; 616800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 617800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 1ULL << ClMappingOffsetLog; 618800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 619800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 620800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = kDefaultShadowScale; 621800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingScale) { 622800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = ClMappingScale; 623800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 624800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Redzone used for stack and globals is at least 32 bytes. 625800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively. 626800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize = std::max(32, (int)(1 << MappingScale)); 627800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 628800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool Res = false; 629800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 630800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClGlobals) 631800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Res |= insertGlobalRedzones(M); 632800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6338c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingOffsetLog >= 0) { 6348c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Tell the run-time the current values of mapping offset and scale. 6358c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_offset = 6368c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 6378c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingOffset), 6388c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingOffsetName); 6398c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 6408c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_offset, true); 6418c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 6428c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingScale) { 6438c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_scale = 6448c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 6458c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingScale), 6468c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingScaleName); 6478c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 6488c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_scale, true); 6498c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 650800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 651800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 652800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) { 653800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (F->isDeclaration()) continue; 654800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Res |= handleFunction(M, *F); 655800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 656800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6577bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority); 6589b02741d2284d9516a59666c211fe1f57e8803adKostya Serebryany 659800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Res; 660800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 661800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 662a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryanybool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) { 663a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // For each NSObject descendant having a +load method, this method is invoked 664a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // by the ObjC runtime before any of the static constructors is called. 665a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // Therefore we need to instrument such methods with a call to __asan_init 666a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // at the beginning in order to initialize our runtime before any access to 667a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // the shadow memory. 668a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // We cannot just ignore these methods, because they may call other 669a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // instrumented functions. 670a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany if (F.getName().find(" load]") != std::string::npos) { 671a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRBuilder<> IRB(F.begin()->begin()); 672a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRB.CreateCall(AsanInitFunction); 673a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return true; 674a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany } 675a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return false; 676a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany} 677a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 678800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::handleFunction(Module &M, Function &F) { 679800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (BL->isIn(F)) return false; 680800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (&F == AsanCtorFunction) return false; 681a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 682a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // If needed, insert __asan_init before checking for AddressSafety attr. 683a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany maybeInsertAsanInitAtFunctionEntry(F); 684a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 6850307b9a88574d7e54459181afaa656ac92971847Kostya Serebryany if (!F.hasFnAttr(Attribute::AddressSafety)) return false; 686800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 687800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClDebugFunc.empty() && ClDebugFunc != F.getName()) 688800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 689800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We want to instrument every address only once per basic block 690800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (unless there are calls between uses). 691800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallSet<Value*, 16> TempsToInstrument; 692800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 16> ToInstrument; 69395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany SmallVector<Instruction*, 8> NoReturnCalls; 694e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 695800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 696800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Fill the set of memory operations to instrument. 697800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 698800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 699800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 700324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany int NumInsnsPerBB = 0; 701800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); 702800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 703bcb55ce3862bbbedac4e09d7099c9e0efc434e4bKostya Serebryany if (LooksLikeCodeInBug11395(BI)) return false; 704e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (Value *Addr = isInterestingMemoryAccess(BI, &IsWrite)) { 705800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptSameTemp) { 706800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TempsToInstrument.insert(Addr)) 707800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; // We've seen this temp in the current BB. 708800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 709800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (isa<MemIntrinsic>(BI) && ClMemIntrin) { 710800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ok, take it. 711800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 71295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CallInst *CI = dyn_cast<CallInst>(BI)) { 713800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A call inside BB. 714800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 71595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CI->doesNotReturn()) { 71695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany NoReturnCalls.push_back(CI); 71795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 718800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 719800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 720800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 721800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ToInstrument.push_back(BI); 722324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany NumInsnsPerBB++; 723324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany if (NumInsnsPerBB >= ClMaxInsnsToInstrumentPerBB) 724324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany break; 725800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 726800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 727800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 728800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Instrument. 729800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int NumInstrumented = 0; 730800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = ToInstrument.size(); i != n; i++) { 731800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Inst = ToInstrument[i]; 732800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugMin < 0 || ClDebugMax < 0 || 733800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) { 734e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (isInterestingMemoryAccess(Inst, &IsWrite)) 735800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMop(Inst); 736800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany else 737800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany instrumentMemIntrinsic(cast<MemIntrinsic>(Inst)); 738800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 739800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NumInstrumented++; 740800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 741800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 742800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 743800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 744800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool ChangedStack = poisonStackInFunction(M, F); 74595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 74695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // We must unpoison the stack before every NoReturn call (throw, _exit, etc). 74795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37 74895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) { 74995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany Instruction *CI = NoReturnCalls[i]; 75095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRBuilder<> IRB(CI); 75195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRB.CreateCall(M.getOrInsertFunction(kAsanHandleNoReturnName, 75295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRB.getVoidTy(), NULL)); 75395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 75495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 75595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty(); 756800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 757800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 758800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) { 759800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 1) return PoisonByte; 760800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 2) return (PoisonByte << 8) + PoisonByte; 761800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 4) 762800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return (PoisonByte << 24) + (PoisonByte << 16) + 763800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (PoisonByte << 8) + (PoisonByte); 764858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper llvm_unreachable("ShadowRedzoneSize is either 1, 2 or 4"); 765800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 766800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 767800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic void PoisonShadowPartialRightRedzone(uint8_t *Shadow, 768800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Size, 769800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize, 770800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowGranularity, 771800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint8_t Magic) { 772800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < RedzoneSize; 773800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany i+= ShadowGranularity, Shadow++) { 774800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (i + ShadowGranularity <= Size) { 775800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = 0; // fully addressable 776800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (i >= Size) { 777800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Magic; // unaddressable 778800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 779800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Size - i; // first Size-i bytes are addressable 780800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 781800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 782800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 783800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 784800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, 785800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB, 786800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison) { 787800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowRZSize = RedzoneSize >> MappingScale; 788800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowRZSize >= 1 && ShadowRZSize <= 4); 789800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8); 790800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZPtrTy = PointerType::get(RZTy, 0); 791800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 792800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonLeft = ConstantInt::get(RZTy, 793800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackLeftRedzoneMagic : 0LL, ShadowRZSize)); 794800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonMid = ConstantInt::get(RZTy, 795800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackMidRedzoneMagic : 0LL, ShadowRZSize)); 796800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonRight = ConstantInt::get(RZTy, 797800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackRightRedzoneMagic : 0LL, ShadowRZSize)); 798800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 799800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison the first red zone. 800800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy)); 801800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 802800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison all other red zones. 803800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 804800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 805800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 806800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 807800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 808800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(AlignedSize - SizeInBytes < RedzoneSize); 809800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Ptr = NULL; 810800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 811800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize; 812800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 813800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowBase->getType() == IntptrTy); 814800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (SizeInBytes < AlignedSize) { 815800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the partial redzone at right 816800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd( 817800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ShadowBase, ConstantInt::get(IntptrTy, 818800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Pos >> MappingScale) - ShadowRZSize)); 819800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t AddressableBytes = RedzoneSize - (AlignedSize - SizeInBytes); 820800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t Poison = 0; 821800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoPoison) { 822800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes, 823800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize, 824800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1ULL << MappingScale, 825800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackPartialRedzoneMagic); 826800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 827800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PartialPoison = ConstantInt::get(RZTy, Poison); 828800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PartialPoison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 829800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 830800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 831800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the full redzone at right. 832800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd(ShadowBase, 833800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, Pos >> MappingScale)); 834800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Poison = i == AllocaVec.size() - 1 ? PoisonRight : PoisonMid; 835800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 836800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 837800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += RedzoneSize; 838800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 839800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 840800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8415a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// Workaround for bug 11395: we don't want to instrument stack in functions 8425a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// with large assembly blobs (32-bit only), otherwise reg alloc may crash. 843d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany// FIXME: remove once the bug 11395 is fixed. 8445a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryanybool AddressSanitizer::LooksLikeCodeInBug11395(Instruction *I) { 8455a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (LongSize != 32) return false; 8465a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany CallInst *CI = dyn_cast<CallInst>(I); 8475a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (!CI || !CI->isInlineAsm()) return false; 8485a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (CI->getNumArgOperands() <= 5) return false; 8495a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany // We have inline assembly with quite a few arguments. 8505a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany return true; 8515a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany} 8525a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany 853800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Find all static Alloca instructions and put 854800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// poisoned red zones around all of them. 855800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Then unpoison everything back before the function returns. 856800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 857800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Stack poisoning does not play well with exception handling. 858800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// When an exception is thrown, we essentially bypass the code 859800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// that unpoisones the stack. This is why the run-time library has 860800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// to intercept __cxa_throw (as well as longjmp, etc) and unpoison the entire 861800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// stack in the interceptor. This however does not work inside the 862800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// actual function which catches the exception. Most likely because the 863800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// compiler hoists the load of the shadow value somewhere too high. 864800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This causes asan to report a non-existing bug on 453.povray. 865800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// It sounds like an LLVM bug. 866800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::poisonStackInFunction(Module &M, Function &F) { 867800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClStack) return false; 868800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<AllocaInst*, 16> AllocaVec; 869800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 8> RetVec; 870800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t TotalSize = 0; 871800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 872800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Filter out Alloca instructions we want (and can) handle. 873800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Collect Ret instructions. 874800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 875800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 876800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock &BB = *FI; 877800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = BB.begin(), BE = BB.end(); 878800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 879800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (isa<ReturnInst>(BI)) { 880800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RetVec.push_back(BI); 881800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 882800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 883800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 884800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = dyn_cast<AllocaInst>(BI); 885800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI) continue; 886800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->isArrayAllocation()) continue; 887800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->isStaticAlloca()) continue; 888800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->getAllocatedType()->isSized()) continue; 889800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->getAlignment() > RedzoneSize) continue; 890800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaVec.push_back(AI); 891800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 892800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TotalSize += AlignedSize; 893800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 894800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 895800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 896800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AllocaVec.empty()) return false; 897800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 898800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t LocalStackSize = TotalSize + (AllocaVec.size() + 1) * RedzoneSize; 899800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 900800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool DoStackMalloc = ClUseAfterReturn 901800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany && LocalStackSize <= kMaxStackMallocSize; 902800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 903800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsBefore = AllocaVec[0]; 904800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsBefore); 905800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 906800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 907800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize); 908800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *MyAlloca = 909800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore); 910800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MyAlloca->setAlignment(RedzoneSize); 911800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(MyAlloca->isStaticAlloca()); 912800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy); 913800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LocalStackBase = OrigStackBase; 914800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 915800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 916800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AsanStackMallocFunc = M.getOrInsertFunction( 917800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL); 918800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc, 919800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase); 920800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 921800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 922800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // This string will be parsed by the run-time (DescribeStackAddress). 923800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallString<2048> StackDescriptionStorage; 924800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany raw_svector_ostream StackDescription(StackDescriptionStorage); 925800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << F.getName() << " " << AllocaVec.size() << " "; 926800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 927800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 928800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Replace Alloca instructions with base+offset. 929800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 930800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 931800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 932800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Name = AI->getName(); 933800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << Pos << " " << SizeInBytes << " " 934800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany << Name.size() << " " << Name << " "; 935800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 936800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert((AlignedSize % RedzoneSize) == 0); 937800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->replaceAllUsesWith( 938800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr( 939800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)), 940800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->getType())); 941800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize + RedzoneSize; 942800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 943800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(Pos == LocalStackSize); 944800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 945800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Write the Magic value and the frame description constant to the redzone. 946800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus0 = IRB.CreateIntToPtr(LocalStackBase, IntptrPtrTy); 947800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(ConstantInt::get(IntptrTy, kCurrentStackFrameMagic), 948800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 949800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus1 = IRB.CreateAdd(LocalStackBase, 950800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LongSize/8)); 951800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy); 952800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Description = IRB.CreatePointerCast( 953800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany createPrivateGlobalForString(M, StackDescription.str()), 954800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy); 955800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Description, BasePlus1); 956800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 957800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the stack redzones at the entry. 958800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase = memToShadow(LocalStackBase, IRB); 959800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRB, ShadowBase, true); 960800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 961800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AsanStackFreeFunc = NULL; 962800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 963800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanStackFreeFunc = M.getOrInsertFunction( 964800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackFreeName, IRB.getVoidTy(), 965800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy, IntptrTy, IntptrTy, NULL); 966800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 967800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 968800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack before all ret instructions. 969800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = RetVec.size(); i < n; i++) { 970800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Ret = RetVec[i]; 971800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRBRet(Ret); 972800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 973800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Mark the current frame as retired. 974800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateStore(ConstantInt::get(IntptrTy, kRetiredStackFrameMagic), 975800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 976800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack. 977800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRBRet, ShadowBase, false); 978800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 979800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 980800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateCall3(AsanStackFreeFunc, LocalStackBase, 981800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), 982800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OrigStackBase); 983800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 984800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 985800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 986800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugStack) { 987800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 988800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 989800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 990800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 991800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 992