AddressSanitizer.cpp revision a5f54f14435d881b10d8eb65e19fa42af95757e9
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 18b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany#include "BlackList.h" 1906cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Function.h" 2006cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/IRBuilder.h" 21f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany#include "llvm/InlineAsm.h" 2206cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/IntrinsicInst.h" 2306cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/LLVMContext.h" 2406cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Module.h" 2506cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Type.h" 26800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/ArrayRef.h" 27800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/OwningPtr.h" 28800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallSet.h" 29800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallString.h" 30800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallVector.h" 31800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/StringExtras.h" 3206fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov#include "llvm/ADT/Triple.h" 33800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/CommandLine.h" 34800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/DataTypes.h" 35800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/Debug.h" 36800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/raw_ostream.h" 37800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/system_error.h" 383574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow#include "llvm/DataLayout.h" 39800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetMachine.h" 40800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Instrumentation.h" 41800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/BasicBlockUtils.h" 42800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/ModuleUtils.h" 43800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 44800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include <string> 45800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include <algorithm> 46800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 47800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyusing namespace llvm; 48800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 49800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowScale = 3; 50800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset32 = 1ULL << 29; 51800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset64 = 1ULL << 44; 5206fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanovstatic const uint64_t kDefaultShadowOffsetAndroid = 0; 53800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 54800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const size_t kMaxStackMallocSize = 1 << 16; // 64K 55800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3; 56800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kRetiredStackFrameMagic = 0x45E0360E; 57800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 58800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanModuleCtorName = "asan.module_ctor"; 597bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanModuleDtorName = "asan.module_dtor"; 607bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const int kAsanCtorAndCtorPriority = 1; 61800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanReportErrorTemplate = "__asan_report_"; 62800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanRegisterGlobalsName = "__asan_register_globals"; 637bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals"; 649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic const char *kAsanPoisonGlobalsName = "__asan_before_dynamic_init"; 659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic const char *kAsanUnpoisonGlobalsName = "__asan_after_dynamic_init"; 66800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanInitName = "__asan_init"; 6795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryanystatic const char *kAsanHandleNoReturnName = "__asan_handle_no_return"; 68800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingOffsetName = "__asan_mapping_offset"; 69800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingScaleName = "__asan_mapping_scale"; 70800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackMallocName = "__asan_stack_malloc"; 71800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackFreeName = "__asan_stack_free"; 72800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 73800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackLeftRedzoneMagic = 0xf1; 74800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackMidRedzoneMagic = 0xf2; 75800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackRightRedzoneMagic = 0xf3; 76800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackPartialRedzoneMagic = 0xf4; 77800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 78c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany// Accesses sizes are powers of two: 1, 2, 4, 8, 16. 79c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanystatic const size_t kNumberOfAccessSizes = 5; 80c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 81800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Command-line flags. 82800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 83800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no-]asan-reads. 84800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentReads("asan-instrument-reads", 85800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument read instructions"), cl::Hidden, cl::init(true)); 86800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentWrites("asan-instrument-writes", 87800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument write instructions"), cl::Hidden, cl::init(true)); 88e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic cl::opt<bool> ClInstrumentAtomics("asan-instrument-atomics", 89e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::desc("instrument atomic instructions (rmw, cmpxchg)"), 90e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::Hidden, cl::init(true)); 916e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryanystatic cl::opt<bool> ClAlwaysSlowPath("asan-always-slow-path", 926e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany cl::desc("use instrumentation with slow path for all accesses"), 936e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany cl::Hidden, cl::init(false)); 94c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany// This flag limits the number of instructions to be instrumented 95324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// in any given BB. Normally, this should be set to unlimited (INT_MAX), 96324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// but due to http://llvm.org/bugs/show_bug.cgi?id=12652 we temporary 97324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// set it to 10000. 98324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryanystatic cl::opt<int> ClMaxInsnsToInstrumentPerBB("asan-max-ins-per-bb", 99324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::init(10000), 100324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::desc("maximal number of instructions to instrument in any given BB"), 101324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::Hidden); 102800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-stack. 103800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClStack("asan-stack", 104800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle stack memory"), cl::Hidden, cl::init(true)); 105800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-use-after-return. 106800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClUseAfterReturn("asan-use-after-return", 107800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Check return-after-free"), cl::Hidden, cl::init(false)); 108800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-globals. 109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClGlobals("asan-globals", 110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle global objects"), cl::Hidden, cl::init(true)); 1119b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic cl::opt<bool> ClInitializers("asan-initialization-order", 1129b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany cl::desc("Handle C++ initializer order"), cl::Hidden, cl::init(false)); 113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClMemIntrin("asan-memintrin", 114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle memset/memcpy/memmove"), cl::Hidden, cl::init(true)); 115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -fasan-blacklist. 116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClBlackListFile("asan-blacklist", 117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("File containing the list of functions to ignore " 118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "during instrumentation"), cl::Hidden); 119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// These flags allow to change the shadow mapping. 121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The shadow mapping looks like 122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Shadow = (Mem >> scale) + (1 << offset_log) 123800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingScale("asan-mapping-scale", 124800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("scale of asan shadow mapping"), cl::Hidden, cl::init(0)); 125800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingOffsetLog("asan-mapping-offset-log", 126800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("offset of asan shadow mapping"), cl::Hidden, cl::init(-1)); 127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Optimization flags. Not user visible, used mostly for testing 129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// and benchmarking the tool. 130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOpt("asan-opt", 131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Optimize instrumentation"), cl::Hidden, cl::init(true)); 132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptSameTemp("asan-opt-same-temp", 133800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Instrument the same temp just once"), cl::Hidden, 134800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(true)); 135800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptGlobals("asan-opt-globals", 136800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Don't instrument scalar globals"), cl::Hidden, cl::init(true)); 137800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 138800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Debug flags. 139800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebug("asan-debug", cl::desc("debug"), cl::Hidden, 140800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(0)); 141800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugStack("asan-debug-stack", cl::desc("debug stack"), 142800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(0)); 143800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClDebugFunc("asan-debug-func", 144800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::desc("Debug func")); 145800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMin("asan-debug-min", cl::desc("Debug min inst"), 146800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 147800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMax("asan-debug-max", cl::desc("Debug man inst"), 148800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 149800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 150800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanynamespace { 151800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany/// AddressSanitizer: instrument the code in module to find memory bugs. 152ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanystruct AddressSanitizer : public FunctionPass { 153800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AddressSanitizer(); 15425878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko virtual const char *getPassName() const; 155ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentMop(Instruction *I); 156ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentAddress(Instruction *OrigIns, IRBuilder<> &IRB, 157800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, uint32_t TypeSize, bool IsWrite); 158c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 159c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, uint32_t TypeSize); 160ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *generateCrashCode(Instruction *InsertBefore, Value *Addr, 1612735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany bool IsWrite, size_t AccessSizeIndex); 162ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool instrumentMemIntrinsic(MemIntrinsic *MI); 163ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentMemIntrinsicParam(Instruction *OrigIns, Value *Addr, 164c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Size, 165800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore, bool IsWrite); 166800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *memToShadow(Value *Shadow, IRBuilder<> &IRB); 167ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool runOnFunction(Function &F); 1689b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void createInitializerPoisonCalls(Module &M, 1699b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstAddr, Value *LastAddr); 170a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany bool maybeInsertAsanInitAtFunctionEntry(Function &F); 171ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool poisonStackInFunction(Function &F); 172ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany virtual bool doInitialization(Module &M); 173ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany virtual bool doFinalization(Module &M); 174800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool insertGlobalRedzones(Module &M); 175800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany static char ID; // Pass identification, replacement for typeid 176800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 177800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 178800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAllocaSizeInBytes(AllocaInst *AI) { 179800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = AI->getAllocatedType(); 180d8313be41031e4d768f5b38199904d4debff88cdEvgeniy Stepanov uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 181800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return SizeInBytes; 182800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 183800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedSize(uint64_t SizeInBytes) { 184800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return ((SizeInBytes + RedzoneSize - 1) 185800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany / RedzoneSize) * RedzoneSize; 186800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 187800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedAllocaSize(AllocaInst *AI) { 188800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 189800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return getAlignedSize(SizeInBytes); 190800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 191800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 19255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *checkInterfaceFunction(Constant *FuncOrBitcast); 1939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool ShouldInstrumentGlobal(GlobalVariable *G); 194800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, 195800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison); 1965a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany bool LooksLikeCodeInBug11395(Instruction *I); 1979b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void FindDynamicInitializers(Module &M); 1989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool HasDynamicInitializer(GlobalVariable *G); 199800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 200800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LLVMContext *C; 2013574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow DataLayout *TD; 202800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t MappingOffset; 203800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int MappingScale; 204800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize; 205800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int LongSize; 206800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrTy; 207800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrPtrTy; 208800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanCtorFunction; 209800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanInitFunction; 210ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Function *AsanStackMallocFunc, *AsanStackFreeFunc; 211ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Function *AsanHandleNoReturnFunc; 212800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *CtorInsertBefore; 213b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany OwningPtr<BlackList> BL; 2149db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // This array is indexed by AccessIsWrite and log2(AccessSize). 2159db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany Function *AsanErrorCallback[2][kNumberOfAccessSizes]; 216f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany InlineAsm *EmptyAsm; 2179b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany SmallSet<GlobalValue*, 32> DynamicallyInitializedGlobals; 218a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany SmallSet<GlobalValue*, 32> GlobalsCreatedByAsan; 219800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 220c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 221800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} // namespace 222800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 223800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanychar AddressSanitizer::ID = 0; 224800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyINITIALIZE_PASS(AddressSanitizer, "asan", 225800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs.", 226800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany false, false) 227ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya SerebryanyAddressSanitizer::AddressSanitizer() : FunctionPass(ID) { } 228ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya SerebryanyFunctionPass *llvm::createAddressSanitizerPass() { 229800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new AddressSanitizer(); 230800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 231800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 23225878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenkoconst char *AddressSanitizer::getPassName() const { 23325878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko return "AddressSanitizer"; 23425878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko} 23525878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko 2362735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryanystatic size_t TypeSizeToSizeIndex(uint32_t TypeSize) { 2372735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany size_t Res = CountTrailingZeros_32(TypeSize / 8); 2382735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany assert(Res < kNumberOfAccessSizes); 2392735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany return Res; 2402735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany} 2412735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany 242800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Create a constant for Str so that we can pass it to the run-time lib. 243800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) { 24418c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str); 245800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new GlobalVariable(M, StrConst->getType(), true, 246800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::PrivateLinkage, StrConst, ""); 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 259c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanyvoid AddressSanitizer::instrumentMemIntrinsicParam( 260ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Instruction *OrigIns, 261800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) { 262800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the first byte. 263800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 264800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 265ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(OrigIns, IRB, Addr, 8, IsWrite); 266800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 267800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the last byte. 268800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 269800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 270800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *SizeMinusOne = IRB.CreateSub( 271800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Size, ConstantInt::get(Size->getType(), 1)); 272800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SizeMinusOne = IRB.CreateIntCast(SizeMinusOne, IntptrTy, false); 273800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 274800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrPlusSizeMinisOne = IRB.CreateAdd(AddrLong, SizeMinusOne); 275ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(OrigIns, IRB, AddrPlusSizeMinisOne, 8, IsWrite); 276800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 277800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 278800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 279800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Instrument memset/memmove/memcpy 280ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::instrumentMemIntrinsic(MemIntrinsic *MI) { 281800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Dst = MI->getDest(); 282800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI); 2832735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany Value *Src = MemTran ? MemTran->getSource() : 0; 284800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Length = MI->getLength(); 285800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 286800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *ConstLength = dyn_cast<Constant>(Length); 287800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore = MI; 288800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength) { 289800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength->isNullValue()) return false; 290800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 291800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // The size is not a constant so it could be zero -- check at run-time. 292800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 293800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 294800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(Length, 29556139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Constant::getNullValue(Length->getType())); 2964a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov InsertBefore = SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false); 297800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 298800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 299ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsicParam(MI, Dst, Length, InsertBefore, true); 300800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Src) 301ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsicParam(MI, Src, Length, InsertBefore, false); 302800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 303800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 304800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 305e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// If I is an interesting memory access, return the PointerOperand 306e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// and set IsWrite. Otherwise return NULL. 307e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic Value *isInterestingMemoryAccess(Instruction *I, bool *IsWrite) { 308800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 309e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentReads) return NULL; 310e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = false; 311800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return LI->getPointerOperand(); 312800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 313e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (StoreInst *SI = dyn_cast<StoreInst>(I)) { 314e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentWrites) return NULL; 315e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 316e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return SI->getPointerOperand(); 317e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 318e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(I)) { 319e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 320e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 321e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return RMW->getPointerOperand(); 322e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 323e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicCmpXchgInst *XCHG = dyn_cast<AtomicCmpXchgInst>(I)) { 324e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 325e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 326e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return XCHG->getPointerOperand(); 327e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 328e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return NULL; 329800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 330800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 3319b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanyvoid AddressSanitizer::FindDynamicInitializers(Module& M) { 3329b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Clang generates metadata identifying all dynamically initialized globals. 3339b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany NamedMDNode *DynamicGlobals = 3349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany M.getNamedMetadata("llvm.asan.dynamically_initialized_globals"); 3359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!DynamicGlobals) 3369b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 3379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (int i = 0, n = DynamicGlobals->getNumOperands(); i < n; ++i) { 3389b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany MDNode *MDN = DynamicGlobals->getOperand(i); 3399b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany assert(MDN->getNumOperands() == 1); 3409b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *VG = MDN->getOperand(0); 3419b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // The optimizer may optimize away a global entirely, in which case we 3429b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // cannot instrument access to it. 3439b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!VG) 3449b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany continue; 3459b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 3469b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany GlobalVariable *G = cast<GlobalVariable>(VG); 3479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DynamicallyInitializedGlobals.insert(G); 3489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 3499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 3509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany// Returns true if a global variable is initialized dynamically in this TU. 3519b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanybool AddressSanitizer::HasDynamicInitializer(GlobalVariable *G) { 3529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return DynamicallyInitializedGlobals.count(G); 3539b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 3549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 355ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanyvoid AddressSanitizer::instrumentMop(Instruction *I) { 3563780ad8b998d93d7db406919c06137cdb786ef05Axel Naumann bool IsWrite = false; 357e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany Value *Addr = isInterestingMemoryAccess(I, &IsWrite); 358e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany assert(Addr); 3599b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClOpt && ClOptGlobals) { 3609b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (GlobalVariable *G = dyn_cast<GlobalVariable>(Addr)) { 3619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If initialization order checking is disabled, a simple access to a 3629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // dynamically initialized global is always valid. 3639b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!ClInitializers) 3649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 3659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If a global variable does not have dynamic initialization we don't 3669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // have to instrument it. However, if a global has external linkage, we 3679b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // assume it has dynamic initialization, as it may have an initializer 3689b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // in a different TU. 3699b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 3709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany !HasDynamicInitializer(G)) 3719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 3729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 373800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 3749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 375800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigPtrTy = Addr->getType(); 376800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 377800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 378800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(OrigTy->isSized()); 379800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 380800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 381800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize != 8 && TypeSize != 16 && 382800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 383800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all unusual sizes. 384800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 385800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 386800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 387800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(I); 388ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(I, IRB, Addr, TypeSize, IsWrite); 389800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 390800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 39155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// Validate the result of Module::getOrInsertFunction called for an interface 39255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// function of AddressSanitizer. If the instrumented module defines a function 39355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// with the same name, their prototypes must match, otherwise 39455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// getOrInsertFunction returns a bitcast. 39555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander PotapenkoFunction *AddressSanitizer::checkInterfaceFunction(Constant *FuncOrBitcast) { 39655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast); 39755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko FuncOrBitcast->dump(); 39855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko report_fatal_error("trying to redefine an AddressSanitizer " 39955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko "interface function"); 40055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko} 40155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko 402800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyInstruction *AddressSanitizer::generateCrashCode( 403ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *InsertBefore, Value *Addr, 4044f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany bool IsWrite, size_t AccessSizeIndex) { 405ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany IRBuilder<> IRB(InsertBefore); 406ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CallInst *Call = IRB.CreateCall(AsanErrorCallback[IsWrite][AccessSizeIndex], 407ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Addr); 408f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We don't do Call->setDoesNotReturn() because the BB already has 409f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // UnreachableInst at the end. 410f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // This EmptyAsm is required to avoid callback merge. 411f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany IRB.CreateCall(EmptyAsm); 4123c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany return Call; 413800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 414800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 4152735cf4aa52e31b8d2de90f836c3ad991215e04eKostya SerebryanyValue *AddressSanitizer::createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 416c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, 417c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany uint32_t TypeSize) { 418c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany size_t Granularity = 1 << MappingScale; 419c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // Addr & (Granularity - 1) 420c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *LastAccessedByte = IRB.CreateAnd( 421c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany AddrLong, ConstantInt::get(IntptrTy, Granularity - 1)); 422c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (Addr & (Granularity - 1)) + size - 1 423c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany if (TypeSize / 8 > 1) 424c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateAdd( 425c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1)); 426c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (uint8_t) ((Addr & (Granularity-1)) + size - 1) 427c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateIntCast( 4286e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany LastAccessedByte, ShadowValue->getType(), false); 429c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue 430c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany return IRB.CreateICmpSGE(LastAccessedByte, ShadowValue); 431c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany} 432c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 433ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanyvoid AddressSanitizer::instrumentAddress(Instruction *OrigIns, 434800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, 435800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize, bool IsWrite) { 436800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 437800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 438800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowTy = IntegerType::get( 439800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *C, std::max(8U, TypeSize >> MappingScale)); 440800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowPtrTy = PointerType::get(ShadowTy, 0); 441800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowPtr = memToShadow(AddrLong, IRB); 442800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *CmpVal = Constant::getNullValue(ShadowTy); 443800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowValue = IRB.CreateLoad( 444800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy)); 445800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 446800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal); 44711c2a47af825a0f89d75aaa97ad873ed2acef266Kostya Serebryany size_t AccessSizeIndex = TypeSizeToSizeIndex(TypeSize); 448800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Granularity = 1 << MappingScale; 449ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany TerminatorInst *CrashTerm = 0; 450ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 4516e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany if (ClAlwaysSlowPath || (TypeSize < 8 * Granularity)) { 4524a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov TerminatorInst *CheckTerm = 4534a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false); 454ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany assert(dyn_cast<BranchInst>(CheckTerm)->isUnconditional()); 455f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BasicBlock *NextBB = CheckTerm->getSuccessor(0); 456c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany IRB.SetInsertPoint(CheckTerm); 457c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Cmp2 = createSlowPathCmp(IRB, AddrLong, ShadowValue, TypeSize); 458ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany BasicBlock *CrashBlock = 459ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany BasicBlock::Create(*C, "", NextBB->getParent(), NextBB); 460ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CrashTerm = new UnreachableInst(*C, CrashBlock); 461f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BranchInst *NewTerm = BranchInst::Create(CrashBlock, NextBB, Cmp2); 462f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany ReplaceInstWithInst(CheckTerm, NewTerm); 463c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany } else { 4644a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov CrashTerm = SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), true); 465800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 466ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 467ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *Crash = 468ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany generateCrashCode(CrashTerm, AddrLong, IsWrite, AccessSizeIndex); 469ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Crash->setDebugLoc(OrigIns->getDebugLoc()); 470800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 471800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 4729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanyvoid AddressSanitizer::createInitializerPoisonCalls(Module &M, 4739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstAddr, 4749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *LastAddr) { 4759b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // We do all of our poisoning and unpoisoning within _GLOBAL__I_a. 4769b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *GlobalInit = M.getFunction("_GLOBAL__I_a"); 4779b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If that function is not present, this TU contains no globals, or they have 4789b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // all been optimized away 4799b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!GlobalInit) 4809b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 4819b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 4829b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Set up the arguments to our poison/unpoison functions. 4839b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRBuilder<> IRB(GlobalInit->begin()->getFirstInsertionPt()); 4849b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 4859b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Declare our poisoning and unpoisoning functions. 4869b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *AsanPoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 4879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanPoisonGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 4889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany AsanPoisonGlobals->setLinkage(Function::ExternalLinkage); 4899b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *AsanUnpoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 4909b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanUnpoisonGlobalsName, IRB.getVoidTy(), NULL)); 4919b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany AsanUnpoisonGlobals->setLinkage(Function::ExternalLinkage); 4929b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 4939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add a call to poison all external globals before the given function starts. 4949b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRB.CreateCall2(AsanPoisonGlobals, FirstAddr, LastAddr); 4959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 4969b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add calls to unpoison all globals before each return instruction. 4979b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Function::iterator I = GlobalInit->begin(), E = GlobalInit->end(); 4989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany I != E; ++I) { 4999b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ReturnInst *RI = dyn_cast<ReturnInst>(I->getTerminator())) { 5009b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany CallInst::Create(AsanUnpoisonGlobals, "", RI); 5019b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5029b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5039b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 5049b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5059b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanybool AddressSanitizer::ShouldInstrumentGlobal(GlobalVariable *G) { 5069b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Type *Ty = cast<PointerType>(G->getType())->getElementType(); 507324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "GLOBAL: " << *G << "\n"); 5089b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 50959a4a47a7bea7cc17877c6a3954ad9f8309ff1cbKostya Serebryany if (BL->isIn(*G)) return false; 5109b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!Ty->isSized()) return false; 5119b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!G->hasInitializer()) return false; 512a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany if (GlobalsCreatedByAsan.count(G)) return false; // Our own global. 5139b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Touch only those globals that will not be defined in other modules. 5149b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Don't handle ODR type linkages since other modules may be built w/o asan. 5159b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 5169b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::PrivateLinkage && 5179b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::InternalLinkage) 5189b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5199b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Two problems with thread-locals: 5209b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - The address of the main thread's copy can't be computed at link-time. 5219b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - Need to poison all copies, not just the main thread's one. 5229b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->isThreadLocal()) 5239b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5249b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // For now, just ignore this Alloca if the alignment is large. 5259b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getAlignment() > RedzoneSize) return false; 5269b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5279b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore all the globals with the names starting with "\01L_OBJC_". 5289b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Many of those are put into the .cstring section. The linker compresses 5299b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // that section by removing the spare \0s after the string terminator, so 5309b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // our redzones get broken. 5319b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((G->getName().find("\01L_OBJC_") == 0) || 5329b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (G->getName().find("\01l_OBJC_") == 0)) { 5339b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G); 5349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5369b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->hasSection()) { 5389b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany StringRef Section(G->getSection()); 5399b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore the globals from the __OBJC section. The ObjC runtime assumes 5409b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to 5419b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // them. 5429b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((Section.find("__OBJC,") == 0) || 5439b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (Section.find("__DATA, __objc_") == 0)) { 5449b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G); 5459b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5469b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // See http://code.google.com/p/address-sanitizer/issues/detail?id=32 5489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Constant CFString instances are compiled in the following way: 5499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the string buffer is emitted into 5509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // __TEXT,__cstring,cstring_literals 5519b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the constant NSConstantString structure referencing that buffer 5529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // is placed into __DATA,__cfstring 5539b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Therefore there's no point in placing redzones into __DATA,__cfstring. 5549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Moreover, it causes the linker to crash on OS X 10.7 5559b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (Section.find("__DATA,__cfstring") == 0) { 5569b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring CFString: " << *G); 5579b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5589b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5599b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5609b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return true; 5629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 5639b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 564800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This function replaces all global variables with new variables that have 565800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// trailing redzones. It also creates a function that poisons 566800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// redzones and inserts this function into llvm.global_ctors. 567800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::insertGlobalRedzones(Module &M) { 568800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<GlobalVariable *, 16> GlobalsToChange; 569800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Module::GlobalListType::iterator G = M.global_begin(), 5719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany E = M.global_end(); G != E; ++G) { 5729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ShouldInstrumentGlobal(G)) 5739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany GlobalsToChange.push_back(G); 574800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 575800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 576800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t n = GlobalsToChange.size(); 577800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (n == 0) return false; 578800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 579800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A global is described by a structure 580800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t beg; 581800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size; 582800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size_with_redzone; 583800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // const char *name; 5849b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // size_t has_dynamic_init; 585800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We initialize an array of such structures and pass it to a run-time call. 586800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy, 5879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, IntptrTy, 5889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, NULL); 5899b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany SmallVector<Constant *, 16> Initializers(n), DynamicInit; 590800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 591800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 592800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClInitializers) 5949b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany FindDynamicInitializers(M); 5959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5969b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // The addresses of the first and last dynamically initialized globals in 5979b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // this TU. Used in initialization order checking. 5989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstDynamic = 0, *LastDynamic = 0; 5999b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 600800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < n; i++) { 601800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *G = GlobalsToChange[i]; 602800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PointerType *PtrTy = cast<PointerType>(G->getType()); 603800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = PtrTy->getElementType(); 604208a4ff2b56f453910bb817540f34b8169f7702aKostya Serebryany uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 605800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t RightRedzoneSize = RedzoneSize + 606800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (RedzoneSize - (SizeInBytes % RedzoneSize)); 607800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize); 6089b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Determine whether this global should be poisoned in initialization. 6099b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool GlobalHasDynamicInitializer = HasDynamicInitializer(G); 61059a4a47a7bea7cc17877c6a3954ad9f8309ff1cbKostya Serebryany // Don't check initialization order if this global is blacklisted. 6117dadac65d375ff21b7a36bfb7642578d2f467525Kostya Serebryany GlobalHasDynamicInitializer &= !BL->isInInit(*G); 612800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 613800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL); 614800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *NewInitializer = ConstantStruct::get( 615800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewTy, G->getInitializer(), 616800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(RightRedZoneTy), NULL); 617800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 618a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany SmallString<2048> DescriptionOfGlobal = G->getName(); 619a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += " ("; 620a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += M.getModuleIdentifier(); 621a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += ")"; 622a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal); 623800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 624800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Create a new global variable with enough space for a redzone. 625800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *NewGlobal = new GlobalVariable( 626800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, NewTy, G->isConstant(), G->getLinkage(), 627ce718ff9f42c7da092eaa01dd0242e8d5ba84713Hans Wennborg NewInitializer, "", G, G->getThreadLocalMode()); 628800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->copyAttributesFrom(G); 629800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->setAlignment(RedzoneSize); 630800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 631800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Indices2[2]; 632800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[0] = IRB.getInt32(0); 633800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[1] = IRB.getInt32(0); 634800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 635800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->replaceAllUsesWith( 636f1639abf1aaba1448f719f595156cd0f4cd560ccKostya Serebryany ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true)); 637800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->takeName(G); 638800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->eraseFromParent(); 639800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 640800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Initializers[i] = ConstantStruct::get( 641800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalStructTy, 642800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(NewGlobal, IntptrTy), 643800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes), 644800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize), 645800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(Name, IntptrTy), 6469b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany ConstantInt::get(IntptrTy, GlobalHasDynamicInitializer), 647800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NULL); 6489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Populate the first and last globals declared in this TU. 6509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClInitializers && GlobalHasDynamicInitializer) { 6519b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany LastDynamic = ConstantExpr::getPointerCast(NewGlobal, IntptrTy); 6529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (FirstDynamic == 0) 6539b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany FirstDynamic = LastDynamic; 6549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 6559b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 656324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "NEW GLOBAL: " << *NewGlobal << "\n"); 657800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 658800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 659800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n); 660800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *AllGlobals = new GlobalVariable( 661800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage, 662800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantArray::get(ArrayOfGlobalStructTy, Initializers), ""); 663800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Create calls for poisoning before initializers run and unpoisoning after. 6659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClInitializers && FirstDynamic && LastDynamic) 6669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany createInitializerPoisonCalls(M, FirstDynamic, LastDynamic); 6679b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 66855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanRegisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 6699b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanRegisterGlobalsName, IRB.getVoidTy(), 6709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, IntptrTy, NULL)); 671800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanRegisterGlobals->setLinkage(Function::ExternalLinkage); 672800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 673800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall2(AsanRegisterGlobals, 674800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 675800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, n)); 676800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6777bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // We also need to unregister globals at the end, e.g. when a shared library 6787bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // gets closed. 6797bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanDtorFunction = Function::Create( 6807bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 6817bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleDtorName, &M); 6827bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction); 6837bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB)); 68455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanUnregisterGlobals = 68555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko checkInterfaceFunction(M.getOrInsertFunction( 68655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko kAsanUnregisterGlobalsName, 68755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 6887bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage); 6897bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 6907bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB_Dtor.CreateCall2(AsanUnregisterGlobals, 6917bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 6927bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany ConstantInt::get(IntptrTy, n)); 6937bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalDtors(M, AsanDtorFunction, kAsanCtorAndCtorPriority); 6947bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 695800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << M); 696800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 697800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 698800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 699800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// virtual 700ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::doInitialization(Module &M) { 701800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Initialize the private fields. No one has accessed them before. 7023574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow TD = getAnalysisIfAvailable<DataLayout>(); 703ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 704800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TD) 705800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 706b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany BL.reset(new BlackList(ClBlackListFile)); 707800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 708800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany C = &(M.getContext()); 709426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth LongSize = TD->getPointerSizeInBits(); 710800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy = Type::getIntNTy(*C, LongSize); 711800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrPtrTy = PointerType::get(IntptrTy, 0); 712800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 713800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanCtorFunction = Function::Create( 714800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 715800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::InternalLinkage, kAsanModuleCtorName, &M); 716800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction); 717800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CtorInsertBefore = ReturnInst::Create(*C, AsanCtorBB); 718800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 719800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // call __asan_init in the module ctor. 720800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 72155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko AsanInitFunction = checkInterfaceFunction( 722800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL)); 723800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanInitFunction->setLinkage(Function::ExternalLinkage); 724800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall(AsanInitFunction); 725800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7269db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // Create __asan_report* callbacks. 7279db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessIsWrite = 0; AccessIsWrite <= 1; AccessIsWrite++) { 7289db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessSizeIndex = 0; AccessSizeIndex < kNumberOfAccessSizes; 7299db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany AccessSizeIndex++) { 7309db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // IsWrite and TypeSize are encoded in the function name. 7319db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany std::string FunctionName = std::string(kAsanReportErrorTemplate) + 7329db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany (AccessIsWrite ? "store" : "load") + itostr(1 << AccessSizeIndex); 7334f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany // If we are merging crash callbacks, they have two parameters. 73411c2a47af825a0f89d75aaa97ad873ed2acef266Kostya Serebryany AsanErrorCallback[AccessIsWrite][AccessSizeIndex] = cast<Function>( 7354f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany M.getOrInsertFunction(FunctionName, IRB.getVoidTy(), IntptrTy, NULL)); 7369db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 7379db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 738ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 739ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany AsanStackMallocFunc = checkInterfaceFunction(M.getOrInsertFunction( 740ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL)); 741ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany AsanStackFreeFunc = checkInterfaceFunction(M.getOrInsertFunction( 742ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany kAsanStackFreeName, IRB.getVoidTy(), 743ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany IntptrTy, IntptrTy, IntptrTy, NULL)); 744ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany AsanHandleNoReturnFunc = checkInterfaceFunction(M.getOrInsertFunction( 745ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany kAsanHandleNoReturnName, IRB.getVoidTy(), NULL)); 746ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 747f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We insert an empty inline asm after __asan_report* to avoid callback merge. 748f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false), 749f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany StringRef(""), StringRef(""), 750f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany /*hasSideEffects=*/true); 7519db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany 75206fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov llvm::Triple targetTriple(M.getTargetTriple()); 75343bf70986bb13c812e87ca959dd8f2dd9edf802cLogan Chien bool isAndroid = targetTriple.getEnvironment() == llvm::Triple::Android; 75406fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov 75506fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov MappingOffset = isAndroid ? kDefaultShadowOffsetAndroid : 75606fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov (LongSize == 32 ? kDefaultShadowOffset32 : kDefaultShadowOffset64); 757800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog >= 0) { 758800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog == 0) { 759800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // special case 760800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 0; 761800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 762800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 1ULL << ClMappingOffsetLog; 763800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 764800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 765800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = kDefaultShadowScale; 766800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingScale) { 767800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = ClMappingScale; 768800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 769800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Redzone used for stack and globals is at least 32 bytes. 770800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively. 771800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize = std::max(32, (int)(1 << MappingScale)); 772800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 773800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7748c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingOffsetLog >= 0) { 7758c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Tell the run-time the current values of mapping offset and scale. 7768c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_offset = 7778c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 7788c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingOffset), 7798c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingOffsetName); 7808c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 7818c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_offset, true); 7828c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 7838c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingScale) { 7848c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_scale = 7858c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 7868c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingScale), 7878c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingScaleName); 7888c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 7898c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_scale, true); 7908c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 791800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7927bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority); 7939b02741d2284d9516a59666c211fe1f57e8803adKostya Serebryany 794ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany return true; 795ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany} 796ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 797ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::doFinalization(Module &M) { 798ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany // We transform the globals at the very end so that the optimization analysis 799ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany // works on the original globals. 800ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany if (ClGlobals) 801ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany return insertGlobalRedzones(M); 802ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany return false; 803800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 804800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 805ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 806a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryanybool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) { 807a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // For each NSObject descendant having a +load method, this method is invoked 808a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // by the ObjC runtime before any of the static constructors is called. 809a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // Therefore we need to instrument such methods with a call to __asan_init 810a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // at the beginning in order to initialize our runtime before any access to 811a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // the shadow memory. 812a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // We cannot just ignore these methods, because they may call other 813a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // instrumented functions. 814a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany if (F.getName().find(" load]") != std::string::npos) { 815a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRBuilder<> IRB(F.begin()->begin()); 816a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRB.CreateCall(AsanInitFunction); 817a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return true; 818a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany } 819a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return false; 820a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany} 821a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 822ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::runOnFunction(Function &F) { 823800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (BL->isIn(F)) return false; 824800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (&F == AsanCtorFunction) return false; 825324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "ASAN instrumenting:\n" << F << "\n"); 826a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 827a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // If needed, insert __asan_init before checking for AddressSafety attr. 828a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany maybeInsertAsanInitAtFunctionEntry(F); 829a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 8306765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling if (!F.getFnAttributes().hasAttribute(Attributes::AddressSafety)) 8316765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling return false; 832800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 833800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClDebugFunc.empty() && ClDebugFunc != F.getName()) 834800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 8356765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling 8366765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling // We want to instrument every address only once per basic block (unless there 8376765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling // are calls between uses). 838800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallSet<Value*, 16> TempsToInstrument; 839800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 16> ToInstrument; 84095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany SmallVector<Instruction*, 8> NoReturnCalls; 841e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 842800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 843800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Fill the set of memory operations to instrument. 844800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 845800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 846800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 847324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany int NumInsnsPerBB = 0; 848800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); 849800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 850bcb55ce3862bbbedac4e09d7099c9e0efc434e4bKostya Serebryany if (LooksLikeCodeInBug11395(BI)) return false; 851e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (Value *Addr = isInterestingMemoryAccess(BI, &IsWrite)) { 852800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptSameTemp) { 853800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TempsToInstrument.insert(Addr)) 854800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; // We've seen this temp in the current BB. 855800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 856800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (isa<MemIntrinsic>(BI) && ClMemIntrin) { 857800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ok, take it. 858800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 85995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CallInst *CI = dyn_cast<CallInst>(BI)) { 860800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A call inside BB. 861800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 86295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CI->doesNotReturn()) { 86395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany NoReturnCalls.push_back(CI); 86495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 865800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 866800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 867800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 868800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ToInstrument.push_back(BI); 869324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany NumInsnsPerBB++; 870324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany if (NumInsnsPerBB >= ClMaxInsnsToInstrumentPerBB) 871324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany break; 872800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 873800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 874800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 875800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Instrument. 876800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int NumInstrumented = 0; 877800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = ToInstrument.size(); i != n; i++) { 878800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Inst = ToInstrument[i]; 879800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugMin < 0 || ClDebugMax < 0 || 880800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) { 881e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (isInterestingMemoryAccess(Inst, &IsWrite)) 882ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMop(Inst); 883800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany else 884ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsic(cast<MemIntrinsic>(Inst)); 885800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 886800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NumInstrumented++; 887800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 888800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 889ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool ChangedStack = poisonStackInFunction(F); 89095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 89195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // We must unpoison the stack before every NoReturn call (throw, _exit, etc). 89295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37 89395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) { 89495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany Instruction *CI = NoReturnCalls[i]; 89595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRBuilder<> IRB(CI); 896ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany IRB.CreateCall(AsanHandleNoReturnFunc); 89795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 898324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "ASAN done instrumenting:\n" << F << "\n"); 89995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 90095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty(); 901800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 902800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 903800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) { 904800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 1) return PoisonByte; 905800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 2) return (PoisonByte << 8) + PoisonByte; 906800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 4) 907800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return (PoisonByte << 24) + (PoisonByte << 16) + 908800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (PoisonByte << 8) + (PoisonByte); 909858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper llvm_unreachable("ShadowRedzoneSize is either 1, 2 or 4"); 910800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 911800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 912800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic void PoisonShadowPartialRightRedzone(uint8_t *Shadow, 913800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Size, 914800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize, 915800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowGranularity, 916800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint8_t Magic) { 917800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < RedzoneSize; 918800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany i+= ShadowGranularity, Shadow++) { 919800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (i + ShadowGranularity <= Size) { 920800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = 0; // fully addressable 921800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (i >= Size) { 922800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Magic; // unaddressable 923800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 924800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Size - i; // first Size-i bytes are addressable 925800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 926800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 927800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 928800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 929800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, 930800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB, 931800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison) { 932800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowRZSize = RedzoneSize >> MappingScale; 933800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowRZSize >= 1 && ShadowRZSize <= 4); 934800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8); 935800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZPtrTy = PointerType::get(RZTy, 0); 936800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 937800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonLeft = ConstantInt::get(RZTy, 938800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackLeftRedzoneMagic : 0LL, ShadowRZSize)); 939800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonMid = ConstantInt::get(RZTy, 940800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackMidRedzoneMagic : 0LL, ShadowRZSize)); 941800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonRight = ConstantInt::get(RZTy, 942800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackRightRedzoneMagic : 0LL, ShadowRZSize)); 943800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 944800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison the first red zone. 945800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy)); 946800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 947800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison all other red zones. 948800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 949800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 950800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 951800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 952800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 953800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(AlignedSize - SizeInBytes < RedzoneSize); 954800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Ptr = NULL; 955800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 956800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize; 957800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 958800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowBase->getType() == IntptrTy); 959800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (SizeInBytes < AlignedSize) { 960800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the partial redzone at right 961800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd( 962800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ShadowBase, ConstantInt::get(IntptrTy, 963800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Pos >> MappingScale) - ShadowRZSize)); 964800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t AddressableBytes = RedzoneSize - (AlignedSize - SizeInBytes); 965800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t Poison = 0; 966800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoPoison) { 967800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes, 968800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize, 969800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1ULL << MappingScale, 970800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackPartialRedzoneMagic); 971800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 972800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PartialPoison = ConstantInt::get(RZTy, Poison); 973800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PartialPoison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 974800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 975800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 976800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the full redzone at right. 977800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd(ShadowBase, 978800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, Pos >> MappingScale)); 979800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Poison = i == AllocaVec.size() - 1 ? PoisonRight : PoisonMid; 980800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 981800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 982800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += RedzoneSize; 983800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 984800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 985800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 9865a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// Workaround for bug 11395: we don't want to instrument stack in functions 9875a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// with large assembly blobs (32-bit only), otherwise reg alloc may crash. 988d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany// FIXME: remove once the bug 11395 is fixed. 9895a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryanybool AddressSanitizer::LooksLikeCodeInBug11395(Instruction *I) { 9905a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (LongSize != 32) return false; 9915a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany CallInst *CI = dyn_cast<CallInst>(I); 9925a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (!CI || !CI->isInlineAsm()) return false; 9935a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (CI->getNumArgOperands() <= 5) return false; 9945a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany // We have inline assembly with quite a few arguments. 9955a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany return true; 9965a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany} 9975a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany 998800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Find all static Alloca instructions and put 999800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// poisoned red zones around all of them. 1000800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Then unpoison everything back before the function returns. 1001800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 1002800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Stack poisoning does not play well with exception handling. 1003800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// When an exception is thrown, we essentially bypass the code 1004800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// that unpoisones the stack. This is why the run-time library has 1005800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// to intercept __cxa_throw (as well as longjmp, etc) and unpoison the entire 1006800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// stack in the interceptor. This however does not work inside the 1007800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// actual function which catches the exception. Most likely because the 1008800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// compiler hoists the load of the shadow value somewhere too high. 1009800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This causes asan to report a non-existing bug on 453.povray. 1010800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// It sounds like an LLVM bug. 1011ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::poisonStackInFunction(Function &F) { 1012800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClStack) return false; 1013800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<AllocaInst*, 16> AllocaVec; 1014800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 8> RetVec; 1015800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t TotalSize = 0; 1016800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1017800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Filter out Alloca instructions we want (and can) handle. 1018800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Collect Ret instructions. 1019800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 1020800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 1021800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock &BB = *FI; 1022800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = BB.begin(), BE = BB.end(); 1023800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 1024800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (isa<ReturnInst>(BI)) { 1025800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RetVec.push_back(BI); 1026800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 1027800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1028800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1029800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = dyn_cast<AllocaInst>(BI); 1030800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI) continue; 1031800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->isArrayAllocation()) continue; 1032800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->isStaticAlloca()) continue; 1033800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->getAllocatedType()->isSized()) continue; 1034800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->getAlignment() > RedzoneSize) continue; 1035800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaVec.push_back(AI); 1036800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1037800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TotalSize += AlignedSize; 1038800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1039800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1040800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1041800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AllocaVec.empty()) return false; 1042800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1043800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t LocalStackSize = TotalSize + (AllocaVec.size() + 1) * RedzoneSize; 1044800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1045800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool DoStackMalloc = ClUseAfterReturn 1046800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany && LocalStackSize <= kMaxStackMallocSize; 1047800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1048800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsBefore = AllocaVec[0]; 1049800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsBefore); 1050800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1051800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1052800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize); 1053800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *MyAlloca = 1054800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore); 1055800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MyAlloca->setAlignment(RedzoneSize); 1056800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(MyAlloca->isStaticAlloca()); 1057800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy); 1058800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LocalStackBase = OrigStackBase; 1059800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1060800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1061800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc, 1062800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase); 1063800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1064800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1065800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // This string will be parsed by the run-time (DescribeStackAddress). 1066800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallString<2048> StackDescriptionStorage; 1067800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany raw_svector_ostream StackDescription(StackDescriptionStorage); 1068800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << F.getName() << " " << AllocaVec.size() << " "; 1069800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1070800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 1071800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Replace Alloca instructions with base+offset. 1072800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 1073800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 1074800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 1075800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Name = AI->getName(); 1076800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << Pos << " " << SizeInBytes << " " 1077800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany << Name.size() << " " << Name << " "; 1078800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1079800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert((AlignedSize % RedzoneSize) == 0); 1080800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->replaceAllUsesWith( 1081800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr( 1082800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)), 1083800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->getType())); 1084800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize + RedzoneSize; 1085800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1086800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(Pos == LocalStackSize); 1087800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1088800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Write the Magic value and the frame description constant to the redzone. 1089800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus0 = IRB.CreateIntToPtr(LocalStackBase, IntptrPtrTy); 1090800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(ConstantInt::get(IntptrTy, kCurrentStackFrameMagic), 1091800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1092800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus1 = IRB.CreateAdd(LocalStackBase, 1093800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LongSize/8)); 1094800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy); 1095a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany GlobalVariable *StackDescriptionGlobal = 1096a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany createPrivateGlobalForString(*F.getParent(), StackDescription.str()); 1097a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany GlobalsCreatedByAsan.insert(StackDescriptionGlobal); 1098a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany Value *Description = IRB.CreatePointerCast(StackDescriptionGlobal, IntptrTy); 1099800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Description, BasePlus1); 1100800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1101800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the stack redzones at the entry. 1102800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase = memToShadow(LocalStackBase, IRB); 1103800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRB, ShadowBase, true); 1104800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1105800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack before all ret instructions. 1106800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = RetVec.size(); i < n; i++) { 1107800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Ret = RetVec[i]; 1108800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRBRet(Ret); 1109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Mark the current frame as retired. 1111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateStore(ConstantInt::get(IntptrTy, kRetiredStackFrameMagic), 1112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack. 1114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRBRet, ShadowBase, false); 1115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateCall3(AsanStackFreeFunc, LocalStackBase, 1118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), 1119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OrigStackBase); 1120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1123bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany // We are done. Remove the old unused alloca instructions. 1124bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) 1125bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany AllocaVec[i]->eraseFromParent(); 1126bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany 1127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugStack) { 1128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 1129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 1132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1133