AddressSanitizer.cpp revision 9b9f87a87ac1b373c4c6a70904315bebbd01c50c
1800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===-- AddressSanitizer.cpp - memory error detector ------------*- C++ -*-===// 2800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 3800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The LLVM Compiler Infrastructure 4800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 5800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This file is distributed under the University of Illinois Open Source 6800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// License. See LICENSE.TXT for details. 7800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 8800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===----------------------------------------------------------------------===// 9800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 10800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This file is a part of AddressSanitizer, an address sanity checker. 11800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Details of the algorithm: 12800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// http://code.google.com/p/address-sanitizer/wiki/AddressSanitizerAlgorithm 13800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 14800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===----------------------------------------------------------------------===// 15800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 16800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#define DEBUG_TYPE "asan" 17800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 18a1c45044099cf7fb4a072f1326f164706d5bb2e2Kostya Serebryany#include "FunctionBlackList.h" 1906cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Function.h" 2006cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/IRBuilder.h" 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" 38800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetData.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 152c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany/// An object of this type is created while instrumenting every function. 153c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanystruct AsanFunctionContext { 15411c2a47af825a0f89d75aaa97ad873ed2acef266Kostya Serebryany AsanFunctionContext(Function &Function) : F(Function) { } 155c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 1562735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany Function &F; 157c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany}; 158c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 159800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany/// AddressSanitizer: instrument the code in module to find memory bugs. 160800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystruct AddressSanitizer : public ModulePass { 161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AddressSanitizer(); 16225878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko virtual const char *getPassName() const; 163c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany void instrumentMop(AsanFunctionContext &AFC, Instruction *I); 164c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany void instrumentAddress(AsanFunctionContext &AFC, 165c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Instruction *OrigIns, IRBuilder<> &IRB, 166800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, uint32_t TypeSize, bool IsWrite); 167c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 168c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, uint32_t TypeSize); 169ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *generateCrashCode(Instruction *InsertBefore, Value *Addr, 1702735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany bool IsWrite, size_t AccessSizeIndex); 171c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany bool instrumentMemIntrinsic(AsanFunctionContext &AFC, MemIntrinsic *MI); 172c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany void instrumentMemIntrinsicParam(AsanFunctionContext &AFC, 173c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Instruction *OrigIns, Value *Addr, 174c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Size, 175800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore, bool IsWrite); 176800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *memToShadow(Value *Shadow, IRBuilder<> &IRB); 177800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool handleFunction(Module &M, Function &F); 1789b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void createInitializerPoisonCalls(Module &M, 1799b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstAddr, Value *LastAddr); 180a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany bool maybeInsertAsanInitAtFunctionEntry(Function &F); 181800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool poisonStackInFunction(Module &M, Function &F); 182800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany virtual bool runOnModule(Module &M); 183800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool insertGlobalRedzones(Module &M); 184800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany static char ID; // Pass identification, replacement for typeid 185800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 186800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 187800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAllocaSizeInBytes(AllocaInst *AI) { 188800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = AI->getAllocatedType(); 189d8313be41031e4d768f5b38199904d4debff88cdEvgeniy Stepanov uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 190800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return SizeInBytes; 191800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 192800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedSize(uint64_t SizeInBytes) { 193800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return ((SizeInBytes + RedzoneSize - 1) 194800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany / RedzoneSize) * RedzoneSize; 195800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 196800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedAllocaSize(AllocaInst *AI) { 197800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 198800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return getAlignedSize(SizeInBytes); 199800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 200800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 20155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *checkInterfaceFunction(Constant *FuncOrBitcast); 2029b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool ShouldInstrumentGlobal(GlobalVariable *G); 203800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, 204800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison); 2055a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany bool LooksLikeCodeInBug11395(Instruction *I); 2069b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void FindDynamicInitializers(Module &M); 2079b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool HasDynamicInitializer(GlobalVariable *G); 208800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 209800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LLVMContext *C; 210800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TargetData *TD; 211800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t MappingOffset; 212800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int MappingScale; 213800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize; 214800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int LongSize; 215800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrTy; 216800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrPtrTy; 217800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanCtorFunction; 218800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanInitFunction; 219800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *CtorInsertBefore; 220a1c45044099cf7fb4a072f1326f164706d5bb2e2Kostya Serebryany OwningPtr<FunctionBlackList> BL; 2219db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // This array is indexed by AccessIsWrite and log2(AccessSize). 2229db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany Function *AsanErrorCallback[2][kNumberOfAccessSizes]; 223f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany InlineAsm *EmptyAsm; 2249b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany SmallSet<GlobalValue*, 32> DynamicallyInitializedGlobals; 225800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 226c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 227800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} // namespace 228800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 229800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanychar AddressSanitizer::ID = 0; 230800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyINITIALIZE_PASS(AddressSanitizer, "asan", 231800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs.", 232800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany false, false) 233800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyAddressSanitizer::AddressSanitizer() : ModulePass(ID) { } 234800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyModulePass *llvm::createAddressSanitizerPass() { 235800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new AddressSanitizer(); 236800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 237800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 23825878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenkoconst char *AddressSanitizer::getPassName() const { 23925878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko return "AddressSanitizer"; 24025878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko} 24125878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko 2422735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryanystatic size_t TypeSizeToSizeIndex(uint32_t TypeSize) { 2432735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany size_t Res = CountTrailingZeros_32(TypeSize / 8); 2442735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany assert(Res < kNumberOfAccessSizes); 2452735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany return Res; 2462735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany} 2472735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany 248800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Create a constant for Str so that we can pass it to the run-time lib. 249800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) { 25018c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str); 251800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new GlobalVariable(M, StrConst->getType(), true, 252800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::PrivateLinkage, StrConst, ""); 253800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 254800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 255800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Split the basic block and insert an if-then code. 256800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Before: 257800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Head 25856139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany// Cmp 259800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Tail 260800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// After: 261800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Head 262800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// if (Cmp) 26356139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany// ThenBlock 264800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Tail 265800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 266ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany// ThenBlock block is created and its terminator is returned. 267ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany// If Unreachable, ThenBlock is terminated with UnreachableInst, otherwise 268ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany// it is terminated with BranchInst to Tail. 269ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryanystatic TerminatorInst *splitBlockAndInsertIfThen(Value *Cmp, bool Unreachable) { 27056139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Instruction *SplitBefore = cast<Instruction>(Cmp)->getNextNode(); 271800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *Head = SplitBefore->getParent(); 272349f14c72cbcd3c50091d20a874967aca5f2f746Chandler Carruth BasicBlock *Tail = Head->splitBasicBlock(SplitBefore); 273800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TerminatorInst *HeadOldTerm = Head->getTerminator(); 274ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany LLVMContext &C = Head->getParent()->getParent()->getContext(); 275ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany BasicBlock *ThenBlock = BasicBlock::Create(C, "", Head->getParent(), Tail); 276ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany TerminatorInst *CheckTerm; 277ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany if (Unreachable) 278ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CheckTerm = new UnreachableInst(C, ThenBlock); 279ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany else 280c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany CheckTerm = BranchInst::Create(Tail, ThenBlock); 281349f14c72cbcd3c50091d20a874967aca5f2f746Chandler Carruth BranchInst *HeadNewTerm = 282349f14c72cbcd3c50091d20a874967aca5f2f746Chandler Carruth BranchInst::Create(/*ifTrue*/ThenBlock, /*ifFalse*/Tail, Cmp); 283349f14c72cbcd3c50091d20a874967aca5f2f746Chandler Carruth ReplaceInstWithInst(HeadOldTerm, HeadNewTerm); 284349f14c72cbcd3c50091d20a874967aca5f2f746Chandler Carruth return CheckTerm; 285800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 286800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 287800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyValue *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) { 288800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Shadow >> scale 289800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Shadow = IRB.CreateLShr(Shadow, MappingScale); 290800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (MappingOffset == 0) 291800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Shadow; 292800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Shadow >> scale) | offset 293800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return IRB.CreateOr(Shadow, ConstantInt::get(IntptrTy, 294800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset)); 295800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 296800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 297c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanyvoid AddressSanitizer::instrumentMemIntrinsicParam( 298c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany AsanFunctionContext &AFC, Instruction *OrigIns, 299800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) { 300800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the first byte. 301800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 302800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 303c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany instrumentAddress(AFC, OrigIns, IRB, Addr, 8, IsWrite); 304800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 305800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the last byte. 306800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 307800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 308800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *SizeMinusOne = IRB.CreateSub( 309800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Size, ConstantInt::get(Size->getType(), 1)); 310800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SizeMinusOne = IRB.CreateIntCast(SizeMinusOne, IntptrTy, false); 311800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 312800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrPlusSizeMinisOne = IRB.CreateAdd(AddrLong, SizeMinusOne); 313c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany instrumentAddress(AFC, OrigIns, IRB, AddrPlusSizeMinisOne, 8, IsWrite); 314800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 315800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 316800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 317800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Instrument memset/memmove/memcpy 318c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanybool AddressSanitizer::instrumentMemIntrinsic(AsanFunctionContext &AFC, 319c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany MemIntrinsic *MI) { 320800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Dst = MI->getDest(); 321800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI); 3222735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany Value *Src = MemTran ? MemTran->getSource() : 0; 323800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Length = MI->getLength(); 324800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 325800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *ConstLength = dyn_cast<Constant>(Length); 326800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore = MI; 327800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength) { 328800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength->isNullValue()) return false; 329800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 330800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // The size is not a constant so it could be zero -- check at run-time. 331800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 332800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 333800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(Length, 33456139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Constant::getNullValue(Length->getType())); 335ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany InsertBefore = splitBlockAndInsertIfThen(Cmp, false); 336800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 337800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 338c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany instrumentMemIntrinsicParam(AFC, MI, Dst, Length, InsertBefore, true); 339800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Src) 340c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany instrumentMemIntrinsicParam(AFC, MI, Src, Length, InsertBefore, false); 341800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 342800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 343800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 344e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// If I is an interesting memory access, return the PointerOperand 345e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// and set IsWrite. Otherwise return NULL. 346e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic Value *isInterestingMemoryAccess(Instruction *I, bool *IsWrite) { 347800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 348e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentReads) return NULL; 349e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = false; 350800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return LI->getPointerOperand(); 351800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 352e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (StoreInst *SI = dyn_cast<StoreInst>(I)) { 353e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentWrites) return NULL; 354e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 355e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return SI->getPointerOperand(); 356e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 357e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(I)) { 358e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 359e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 360e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return RMW->getPointerOperand(); 361e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 362e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicCmpXchgInst *XCHG = dyn_cast<AtomicCmpXchgInst>(I)) { 363e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 364e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 365e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return XCHG->getPointerOperand(); 366e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 367e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return NULL; 368800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 369800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 3709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanyvoid AddressSanitizer::FindDynamicInitializers(Module& M) { 3719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Clang generates metadata identifying all dynamically initialized globals. 3729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany NamedMDNode *DynamicGlobals = 3739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany M.getNamedMetadata("llvm.asan.dynamically_initialized_globals"); 3749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!DynamicGlobals) 3759b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 3769b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (int i = 0, n = DynamicGlobals->getNumOperands(); i < n; ++i) { 3779b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany MDNode *MDN = DynamicGlobals->getOperand(i); 3789b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany assert(MDN->getNumOperands() == 1); 3799b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *VG = MDN->getOperand(0); 3809b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // The optimizer may optimize away a global entirely, in which case we 3819b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // cannot instrument access to it. 3829b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!VG) 3839b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany continue; 3849b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 3859b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany GlobalVariable *G = cast<GlobalVariable>(VG); 3869b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DynamicallyInitializedGlobals.insert(G); 3879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 3889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 3899b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany// Returns true if a global variable is initialized dynamically in this TU. 3909b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanybool AddressSanitizer::HasDynamicInitializer(GlobalVariable *G) { 3919b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return DynamicallyInitializedGlobals.count(G); 3929b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 3939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 394c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanyvoid AddressSanitizer::instrumentMop(AsanFunctionContext &AFC, Instruction *I) { 395e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 396e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany Value *Addr = isInterestingMemoryAccess(I, &IsWrite); 397e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany assert(Addr); 3989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClOpt && ClOptGlobals) { 3999b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (GlobalVariable *G = dyn_cast<GlobalVariable>(Addr)) { 4009b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If initialization order checking is disabled, a simple access to a 4019b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // dynamically initialized global is always valid. 4029b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!ClInitializers) 4039b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 4049b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If a global variable does not have dynamic initialization we don't 4059b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // have to instrument it. However, if a global has external linkage, we 4069b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // assume it has dynamic initialization, as it may have an initializer 4079b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // in a different TU. 4089b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 4099b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany !HasDynamicInitializer(G)) 4109b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 4119b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 412800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 4139b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 414800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigPtrTy = Addr->getType(); 415800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 416800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 417800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(OrigTy->isSized()); 418800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 419800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 420800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize != 8 && TypeSize != 16 && 421800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 422800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all unusual sizes. 423800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 424800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 425800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 426800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(I); 427c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany instrumentAddress(AFC, I, IRB, Addr, TypeSize, IsWrite); 428800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 429800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 43055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// Validate the result of Module::getOrInsertFunction called for an interface 43155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// function of AddressSanitizer. If the instrumented module defines a function 43255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// with the same name, their prototypes must match, otherwise 43355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// getOrInsertFunction returns a bitcast. 43455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander PotapenkoFunction *AddressSanitizer::checkInterfaceFunction(Constant *FuncOrBitcast) { 43555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast); 43655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko FuncOrBitcast->dump(); 43755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko report_fatal_error("trying to redefine an AddressSanitizer " 43855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko "interface function"); 43955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko} 44055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko 441800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyInstruction *AddressSanitizer::generateCrashCode( 442ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *InsertBefore, Value *Addr, 4434f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany bool IsWrite, size_t AccessSizeIndex) { 444ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany IRBuilder<> IRB(InsertBefore); 445ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CallInst *Call = IRB.CreateCall(AsanErrorCallback[IsWrite][AccessSizeIndex], 446ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Addr); 447f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We don't do Call->setDoesNotReturn() because the BB already has 448f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // UnreachableInst at the end. 449f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // This EmptyAsm is required to avoid callback merge. 450f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany IRB.CreateCall(EmptyAsm); 4513c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany return Call; 452800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 453800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 4542735cf4aa52e31b8d2de90f836c3ad991215e04eKostya SerebryanyValue *AddressSanitizer::createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 455c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, 456c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany uint32_t TypeSize) { 457c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany size_t Granularity = 1 << MappingScale; 458c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // Addr & (Granularity - 1) 459c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *LastAccessedByte = IRB.CreateAnd( 460c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany AddrLong, ConstantInt::get(IntptrTy, Granularity - 1)); 461c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (Addr & (Granularity - 1)) + size - 1 462c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany if (TypeSize / 8 > 1) 463c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateAdd( 464c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1)); 465c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (uint8_t) ((Addr & (Granularity-1)) + size - 1) 466c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateIntCast( 4676e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany LastAccessedByte, ShadowValue->getType(), false); 468c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue 469c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany return IRB.CreateICmpSGE(LastAccessedByte, ShadowValue); 470c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany} 471c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 472c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanyvoid AddressSanitizer::instrumentAddress(AsanFunctionContext &AFC, 473c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Instruction *OrigIns, 474800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, 475800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize, bool IsWrite) { 476800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 477800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 478800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowTy = IntegerType::get( 479800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *C, std::max(8U, TypeSize >> MappingScale)); 480800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowPtrTy = PointerType::get(ShadowTy, 0); 481800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowPtr = memToShadow(AddrLong, IRB); 482800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *CmpVal = Constant::getNullValue(ShadowTy); 483800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowValue = IRB.CreateLoad( 484800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy)); 485800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 486800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal); 48711c2a47af825a0f89d75aaa97ad873ed2acef266Kostya Serebryany size_t AccessSizeIndex = TypeSizeToSizeIndex(TypeSize); 488800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Granularity = 1 << MappingScale; 489ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany TerminatorInst *CrashTerm = 0; 490ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 4916e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany if (ClAlwaysSlowPath || (TypeSize < 8 * Granularity)) { 492ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany TerminatorInst *CheckTerm = splitBlockAndInsertIfThen(Cmp, false); 493ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany assert(dyn_cast<BranchInst>(CheckTerm)->isUnconditional()); 494f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BasicBlock *NextBB = CheckTerm->getSuccessor(0); 495c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany IRB.SetInsertPoint(CheckTerm); 496c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Cmp2 = createSlowPathCmp(IRB, AddrLong, ShadowValue, TypeSize); 497ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany BasicBlock *CrashBlock = BasicBlock::Create(*C, "", &AFC.F, NextBB); 498ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CrashTerm = new UnreachableInst(*C, CrashBlock); 499f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BranchInst *NewTerm = BranchInst::Create(CrashBlock, NextBB, Cmp2); 500f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany ReplaceInstWithInst(CheckTerm, NewTerm); 501c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany } else { 502ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CrashTerm = splitBlockAndInsertIfThen(Cmp, true); 503800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 504ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 505ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *Crash = 506ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany generateCrashCode(CrashTerm, AddrLong, IsWrite, AccessSizeIndex); 507ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Crash->setDebugLoc(OrigIns->getDebugLoc()); 508800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 509800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5109b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanyvoid AddressSanitizer::createInitializerPoisonCalls(Module &M, 5119b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstAddr, 5129b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *LastAddr) { 5139b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // We do all of our poisoning and unpoisoning within _GLOBAL__I_a. 5149b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *GlobalInit = M.getFunction("_GLOBAL__I_a"); 5159b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If that function is not present, this TU contains no globals, or they have 5169b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // all been optimized away 5179b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!GlobalInit) 5189b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 5199b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5209b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Set up the arguments to our poison/unpoison functions. 5219b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRBuilder<> IRB(GlobalInit->begin()->getFirstInsertionPt()); 5229b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5239b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Declare our poisoning and unpoisoning functions. 5249b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *AsanPoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 5259b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanPoisonGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 5269b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany AsanPoisonGlobals->setLinkage(Function::ExternalLinkage); 5279b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *AsanUnpoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 5289b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanUnpoisonGlobalsName, IRB.getVoidTy(), NULL)); 5299b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany AsanUnpoisonGlobals->setLinkage(Function::ExternalLinkage); 5309b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5319b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add a call to poison all external globals before the given function starts. 5329b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRB.CreateCall2(AsanPoisonGlobals, FirstAddr, LastAddr); 5339b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add calls to unpoison all globals before each return instruction. 5359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Function::iterator I = GlobalInit->begin(), E = GlobalInit->end(); 5369b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany I != E; ++I) { 5379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ReturnInst *RI = dyn_cast<ReturnInst>(I->getTerminator())) { 5389b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany CallInst::Create(AsanUnpoisonGlobals, "", RI); 5399b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5409b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5419b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 5429b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5439b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanybool AddressSanitizer::ShouldInstrumentGlobal(GlobalVariable *G) { 5449b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Type *Ty = cast<PointerType>(G->getType())->getElementType(); 5459b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "GLOBAL: " << *G); 5469b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!Ty->isSized()) return false; 5489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!G->hasInitializer()) return false; 5499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Touch only those globals that will not be defined in other modules. 5509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Don't handle ODR type linkages since other modules may be built w/o asan. 5519b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 5529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::PrivateLinkage && 5539b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::InternalLinkage) 5549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5559b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Two problems with thread-locals: 5569b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - The address of the main thread's copy can't be computed at link-time. 5579b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - Need to poison all copies, not just the main thread's one. 5589b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->isThreadLocal()) 5599b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5609b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // For now, just ignore this Alloca if the alignment is large. 5619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getAlignment() > RedzoneSize) return false; 5629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5639b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore all the globals with the names starting with "\01L_OBJC_". 5649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Many of those are put into the .cstring section. The linker compresses 5659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // that section by removing the spare \0s after the string terminator, so 5669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // our redzones get broken. 5679b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((G->getName().find("\01L_OBJC_") == 0) || 5689b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (G->getName().find("\01l_OBJC_") == 0)) { 5699b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G); 5709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->hasSection()) { 5749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany StringRef Section(G->getSection()); 5759b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore the globals from the __OBJC section. The ObjC runtime assumes 5769b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to 5779b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // them. 5789b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((Section.find("__OBJC,") == 0) || 5799b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (Section.find("__DATA, __objc_") == 0)) { 5809b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G); 5819b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5829b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5839b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // See http://code.google.com/p/address-sanitizer/issues/detail?id=32 5849b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Constant CFString instances are compiled in the following way: 5859b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the string buffer is emitted into 5869b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // __TEXT,__cstring,cstring_literals 5879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the constant NSConstantString structure referencing that buffer 5889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // is placed into __DATA,__cfstring 5899b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Therefore there's no point in placing redzones into __DATA,__cfstring. 5909b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Moreover, it causes the linker to crash on OS X 10.7 5919b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (Section.find("__DATA,__cfstring") == 0) { 5929b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring CFString: " << *G); 5939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5949b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5969b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5979b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return true; 5989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 5999b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 600800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This function replaces all global variables with new variables that have 601800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// trailing redzones. It also creates a function that poisons 602800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// redzones and inserts this function into llvm.global_ctors. 603800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::insertGlobalRedzones(Module &M) { 604800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<GlobalVariable *, 16> GlobalsToChange; 605800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6069b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Module::GlobalListType::iterator G = M.global_begin(), 6079b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany E = M.global_end(); G != E; ++G) { 6089b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ShouldInstrumentGlobal(G)) 6099b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany GlobalsToChange.push_back(G); 610800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 611800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 612800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t n = GlobalsToChange.size(); 613800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (n == 0) return false; 614800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 615800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A global is described by a structure 616800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t beg; 617800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size; 618800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size_with_redzone; 619800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // const char *name; 6209b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // size_t has_dynamic_init; 621800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We initialize an array of such structures and pass it to a run-time call. 622800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy, 6239b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, IntptrTy, 6249b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, NULL); 6259b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany SmallVector<Constant *, 16> Initializers(n), DynamicInit; 626800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 627800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 628800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6299b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClInitializers) 6309b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany FindDynamicInitializers(M); 6319b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6329b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // The addresses of the first and last dynamically initialized globals in 6339b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // this TU. Used in initialization order checking. 6349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstDynamic = 0, *LastDynamic = 0; 6359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 636800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < n; i++) { 637800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *G = GlobalsToChange[i]; 638800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PointerType *PtrTy = cast<PointerType>(G->getType()); 639800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = PtrTy->getElementType(); 640208a4ff2b56f453910bb817540f34b8169f7702aKostya Serebryany uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 641800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t RightRedzoneSize = RedzoneSize + 642800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (RedzoneSize - (SizeInBytes % RedzoneSize)); 643800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize); 6449b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Determine whether this global should be poisoned in initialization. 6459b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool GlobalHasDynamicInitializer = HasDynamicInitializer(G); 646800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 647800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL); 648800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *NewInitializer = ConstantStruct::get( 649800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewTy, G->getInitializer(), 650800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(RightRedZoneTy), NULL); 651800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 652a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany SmallString<2048> DescriptionOfGlobal = G->getName(); 653a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += " ("; 654a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += M.getModuleIdentifier(); 655a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += ")"; 656a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal); 657800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 658800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Create a new global variable with enough space for a redzone. 659800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *NewGlobal = new GlobalVariable( 660800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, NewTy, G->isConstant(), G->getLinkage(), 661ce718ff9f42c7da092eaa01dd0242e8d5ba84713Hans Wennborg NewInitializer, "", G, G->getThreadLocalMode()); 662800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->copyAttributesFrom(G); 663800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->setAlignment(RedzoneSize); 664800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 665800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Indices2[2]; 666800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[0] = IRB.getInt32(0); 667800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[1] = IRB.getInt32(0); 668800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 669800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->replaceAllUsesWith( 670f1639abf1aaba1448f719f595156cd0f4cd560ccKostya Serebryany ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true)); 671800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->takeName(G); 672800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->eraseFromParent(); 673800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 674800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Initializers[i] = ConstantStruct::get( 675800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalStructTy, 676800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(NewGlobal, IntptrTy), 677800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes), 678800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize), 679800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(Name, IntptrTy), 6809b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany ConstantInt::get(IntptrTy, GlobalHasDynamicInitializer), 681800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NULL); 6829b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6839b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Populate the first and last globals declared in this TU. 6849b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClInitializers && GlobalHasDynamicInitializer) { 6859b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany LastDynamic = ConstantExpr::getPointerCast(NewGlobal, IntptrTy); 6869b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (FirstDynamic == 0) 6879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany FirstDynamic = LastDynamic; 6889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 6899b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 690800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << "NEW GLOBAL:\n" << *NewGlobal); 691800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 692800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 693800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n); 694800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *AllGlobals = new GlobalVariable( 695800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage, 696800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantArray::get(ArrayOfGlobalStructTy, Initializers), ""); 697800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Create calls for poisoning before initializers run and unpoisoning after. 6999b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClInitializers && FirstDynamic && LastDynamic) 7009b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany createInitializerPoisonCalls(M, FirstDynamic, LastDynamic); 7019b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 70255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanRegisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 7039b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanRegisterGlobalsName, IRB.getVoidTy(), 7049b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, IntptrTy, NULL)); 705800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanRegisterGlobals->setLinkage(Function::ExternalLinkage); 706800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 707800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall2(AsanRegisterGlobals, 708800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 709800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, n)); 710800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7117bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // We also need to unregister globals at the end, e.g. when a shared library 7127bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // gets closed. 7137bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanDtorFunction = Function::Create( 7147bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 7157bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleDtorName, &M); 7167bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction); 7177bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB)); 71855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanUnregisterGlobals = 71955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko checkInterfaceFunction(M.getOrInsertFunction( 72055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko kAsanUnregisterGlobalsName, 72155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 7227bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage); 7237bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 7247bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB_Dtor.CreateCall2(AsanUnregisterGlobals, 7257bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 7267bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany ConstantInt::get(IntptrTy, n)); 7277bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalDtors(M, AsanDtorFunction, kAsanCtorAndCtorPriority); 7287bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 729800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << M); 730800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 731800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 732800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 733800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// virtual 734800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::runOnModule(Module &M) { 735800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Initialize the private fields. No one has accessed them before. 736800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TD = getAnalysisIfAvailable<TargetData>(); 737800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TD) 738800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 739a1c45044099cf7fb4a072f1326f164706d5bb2e2Kostya Serebryany BL.reset(new FunctionBlackList(ClBlackListFile)); 740800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 741800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany C = &(M.getContext()); 742800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LongSize = TD->getPointerSizeInBits(); 743800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy = Type::getIntNTy(*C, LongSize); 744800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrPtrTy = PointerType::get(IntptrTy, 0); 745800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 746800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanCtorFunction = Function::Create( 747800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 748800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::InternalLinkage, kAsanModuleCtorName, &M); 749800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction); 750800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CtorInsertBefore = ReturnInst::Create(*C, AsanCtorBB); 751800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 752800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // call __asan_init in the module ctor. 753800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 75455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko AsanInitFunction = checkInterfaceFunction( 755800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL)); 756800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanInitFunction->setLinkage(Function::ExternalLinkage); 757800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall(AsanInitFunction); 758800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7599db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // Create __asan_report* callbacks. 7609db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessIsWrite = 0; AccessIsWrite <= 1; AccessIsWrite++) { 7619db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessSizeIndex = 0; AccessSizeIndex < kNumberOfAccessSizes; 7629db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany AccessSizeIndex++) { 7639db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // IsWrite and TypeSize are encoded in the function name. 7649db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany std::string FunctionName = std::string(kAsanReportErrorTemplate) + 7659db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany (AccessIsWrite ? "store" : "load") + itostr(1 << AccessSizeIndex); 7664f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany // If we are merging crash callbacks, they have two parameters. 76711c2a47af825a0f89d75aaa97ad873ed2acef266Kostya Serebryany AsanErrorCallback[AccessIsWrite][AccessSizeIndex] = cast<Function>( 7684f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany M.getOrInsertFunction(FunctionName, IRB.getVoidTy(), IntptrTy, NULL)); 7699db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 7709db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 771f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We insert an empty inline asm after __asan_report* to avoid callback merge. 772f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false), 773f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany StringRef(""), StringRef(""), 774f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany /*hasSideEffects=*/true); 7759db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany 77606fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov llvm::Triple targetTriple(M.getTargetTriple()); 77706fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov bool isAndroid = targetTriple.getEnvironment() == llvm::Triple::ANDROIDEABI; 77806fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov 77906fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov MappingOffset = isAndroid ? kDefaultShadowOffsetAndroid : 78006fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov (LongSize == 32 ? kDefaultShadowOffset32 : kDefaultShadowOffset64); 781800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog >= 0) { 782800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog == 0) { 783800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // special case 784800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 0; 785800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 786800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 1ULL << ClMappingOffsetLog; 787800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 788800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 789800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = kDefaultShadowScale; 790800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingScale) { 791800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = ClMappingScale; 792800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 793800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Redzone used for stack and globals is at least 32 bytes. 794800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively. 795800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize = std::max(32, (int)(1 << MappingScale)); 796800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 797800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool Res = false; 798800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 799800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClGlobals) 800800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Res |= insertGlobalRedzones(M); 801800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8028c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingOffsetLog >= 0) { 8038c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Tell the run-time the current values of mapping offset and scale. 8048c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_offset = 8058c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 8068c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingOffset), 8078c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingOffsetName); 8088c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 8098c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_offset, true); 8108c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 8118c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingScale) { 8128c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_scale = 8138c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 8148c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingScale), 8158c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingScaleName); 8168c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 8178c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_scale, true); 8188c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 819800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 820800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 821800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) { 822800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (F->isDeclaration()) continue; 823800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Res |= handleFunction(M, *F); 824800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 825800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8267bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority); 8279b02741d2284d9516a59666c211fe1f57e8803adKostya Serebryany 828800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Res; 829800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 830800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 831a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryanybool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) { 832a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // For each NSObject descendant having a +load method, this method is invoked 833a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // by the ObjC runtime before any of the static constructors is called. 834a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // Therefore we need to instrument such methods with a call to __asan_init 835a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // at the beginning in order to initialize our runtime before any access to 836a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // the shadow memory. 837a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // We cannot just ignore these methods, because they may call other 838a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // instrumented functions. 839a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany if (F.getName().find(" load]") != std::string::npos) { 840a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRBuilder<> IRB(F.begin()->begin()); 841a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRB.CreateCall(AsanInitFunction); 842a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return true; 843a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany } 844a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return false; 845a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany} 846a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 847800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::handleFunction(Module &M, Function &F) { 848800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (BL->isIn(F)) return false; 849800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (&F == AsanCtorFunction) return false; 850a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 851a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // If needed, insert __asan_init before checking for AddressSafety attr. 852a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany maybeInsertAsanInitAtFunctionEntry(F); 853a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 8540307b9a88574d7e54459181afaa656ac92971847Kostya Serebryany if (!F.hasFnAttr(Attribute::AddressSafety)) return false; 855800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 856800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClDebugFunc.empty() && ClDebugFunc != F.getName()) 857800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 858800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We want to instrument every address only once per basic block 859800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (unless there are calls between uses). 860800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallSet<Value*, 16> TempsToInstrument; 861800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 16> ToInstrument; 86295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany SmallVector<Instruction*, 8> NoReturnCalls; 863e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 864800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 865800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Fill the set of memory operations to instrument. 866800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 867800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 868800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 869324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany int NumInsnsPerBB = 0; 870800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); 871800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 872bcb55ce3862bbbedac4e09d7099c9e0efc434e4bKostya Serebryany if (LooksLikeCodeInBug11395(BI)) return false; 873e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (Value *Addr = isInterestingMemoryAccess(BI, &IsWrite)) { 874800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptSameTemp) { 875800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TempsToInstrument.insert(Addr)) 876800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; // We've seen this temp in the current BB. 877800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 878800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (isa<MemIntrinsic>(BI) && ClMemIntrin) { 879800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ok, take it. 880800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 88195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CallInst *CI = dyn_cast<CallInst>(BI)) { 882800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A call inside BB. 883800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 88495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CI->doesNotReturn()) { 88595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany NoReturnCalls.push_back(CI); 88695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 887800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 888800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 889800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 890800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ToInstrument.push_back(BI); 891324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany NumInsnsPerBB++; 892324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany if (NumInsnsPerBB >= ClMaxInsnsToInstrumentPerBB) 893324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany break; 894800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 895800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 896800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8972735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany AsanFunctionContext AFC(F); 898c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 899800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Instrument. 900800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int NumInstrumented = 0; 901800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = ToInstrument.size(); i != n; i++) { 902800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Inst = ToInstrument[i]; 903800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugMin < 0 || ClDebugMax < 0 || 904800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) { 905e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (isInterestingMemoryAccess(Inst, &IsWrite)) 906c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany instrumentMop(AFC, Inst); 907800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany else 908c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany instrumentMemIntrinsic(AFC, cast<MemIntrinsic>(Inst)); 909800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 910800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NumInstrumented++; 911800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 912800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 913800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 914800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 915800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool ChangedStack = poisonStackInFunction(M, F); 91695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 91795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // We must unpoison the stack before every NoReturn call (throw, _exit, etc). 91895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37 91995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) { 92095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany Instruction *CI = NoReturnCalls[i]; 92195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRBuilder<> IRB(CI); 92295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRB.CreateCall(M.getOrInsertFunction(kAsanHandleNoReturnName, 92395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRB.getVoidTy(), NULL)); 92495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 92595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 92695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty(); 927800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 928800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 929800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) { 930800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 1) return PoisonByte; 931800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 2) return (PoisonByte << 8) + PoisonByte; 932800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 4) 933800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return (PoisonByte << 24) + (PoisonByte << 16) + 934800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (PoisonByte << 8) + (PoisonByte); 935858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper llvm_unreachable("ShadowRedzoneSize is either 1, 2 or 4"); 936800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 937800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 938800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic void PoisonShadowPartialRightRedzone(uint8_t *Shadow, 939800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Size, 940800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize, 941800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowGranularity, 942800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint8_t Magic) { 943800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < RedzoneSize; 944800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany i+= ShadowGranularity, Shadow++) { 945800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (i + ShadowGranularity <= Size) { 946800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = 0; // fully addressable 947800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (i >= Size) { 948800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Magic; // unaddressable 949800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 950800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Size - i; // first Size-i bytes are addressable 951800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 952800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 953800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 954800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 955800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, 956800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB, 957800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison) { 958800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowRZSize = RedzoneSize >> MappingScale; 959800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowRZSize >= 1 && ShadowRZSize <= 4); 960800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8); 961800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZPtrTy = PointerType::get(RZTy, 0); 962800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 963800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonLeft = ConstantInt::get(RZTy, 964800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackLeftRedzoneMagic : 0LL, ShadowRZSize)); 965800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonMid = ConstantInt::get(RZTy, 966800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackMidRedzoneMagic : 0LL, ShadowRZSize)); 967800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonRight = ConstantInt::get(RZTy, 968800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackRightRedzoneMagic : 0LL, ShadowRZSize)); 969800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 970800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison the first red zone. 971800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy)); 972800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 973800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison all other red zones. 974800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 975800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 976800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 977800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 978800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 979800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(AlignedSize - SizeInBytes < RedzoneSize); 980800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Ptr = NULL; 981800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 982800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize; 983800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 984800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowBase->getType() == IntptrTy); 985800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (SizeInBytes < AlignedSize) { 986800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the partial redzone at right 987800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd( 988800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ShadowBase, ConstantInt::get(IntptrTy, 989800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Pos >> MappingScale) - ShadowRZSize)); 990800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t AddressableBytes = RedzoneSize - (AlignedSize - SizeInBytes); 991800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t Poison = 0; 992800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoPoison) { 993800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes, 994800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize, 995800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1ULL << MappingScale, 996800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackPartialRedzoneMagic); 997800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 998800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PartialPoison = ConstantInt::get(RZTy, Poison); 999800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PartialPoison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 1000800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1001800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1002800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the full redzone at right. 1003800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd(ShadowBase, 1004800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, Pos >> MappingScale)); 1005800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Poison = i == AllocaVec.size() - 1 ? PoisonRight : PoisonMid; 1006800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 1007800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1008800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += RedzoneSize; 1009800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1010800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1011800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 10125a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// Workaround for bug 11395: we don't want to instrument stack in functions 10135a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// with large assembly blobs (32-bit only), otherwise reg alloc may crash. 1014d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany// FIXME: remove once the bug 11395 is fixed. 10155a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryanybool AddressSanitizer::LooksLikeCodeInBug11395(Instruction *I) { 10165a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (LongSize != 32) return false; 10175a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany CallInst *CI = dyn_cast<CallInst>(I); 10185a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (!CI || !CI->isInlineAsm()) return false; 10195a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (CI->getNumArgOperands() <= 5) return false; 10205a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany // We have inline assembly with quite a few arguments. 10215a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany return true; 10225a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany} 10235a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany 1024800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Find all static Alloca instructions and put 1025800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// poisoned red zones around all of them. 1026800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Then unpoison everything back before the function returns. 1027800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 1028800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Stack poisoning does not play well with exception handling. 1029800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// When an exception is thrown, we essentially bypass the code 1030800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// that unpoisones the stack. This is why the run-time library has 1031800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// to intercept __cxa_throw (as well as longjmp, etc) and unpoison the entire 1032800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// stack in the interceptor. This however does not work inside the 1033800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// actual function which catches the exception. Most likely because the 1034800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// compiler hoists the load of the shadow value somewhere too high. 1035800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This causes asan to report a non-existing bug on 453.povray. 1036800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// It sounds like an LLVM bug. 1037800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::poisonStackInFunction(Module &M, Function &F) { 1038800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClStack) return false; 1039800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<AllocaInst*, 16> AllocaVec; 1040800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 8> RetVec; 1041800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t TotalSize = 0; 1042800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1043800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Filter out Alloca instructions we want (and can) handle. 1044800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Collect Ret instructions. 1045800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 1046800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 1047800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock &BB = *FI; 1048800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = BB.begin(), BE = BB.end(); 1049800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 1050800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (isa<ReturnInst>(BI)) { 1051800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RetVec.push_back(BI); 1052800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 1053800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1054800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1055800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = dyn_cast<AllocaInst>(BI); 1056800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI) continue; 1057800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->isArrayAllocation()) continue; 1058800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->isStaticAlloca()) continue; 1059800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->getAllocatedType()->isSized()) continue; 1060800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->getAlignment() > RedzoneSize) continue; 1061800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaVec.push_back(AI); 1062800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1063800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TotalSize += AlignedSize; 1064800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1065800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1066800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1067800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AllocaVec.empty()) return false; 1068800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1069800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t LocalStackSize = TotalSize + (AllocaVec.size() + 1) * RedzoneSize; 1070800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1071800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool DoStackMalloc = ClUseAfterReturn 1072800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany && LocalStackSize <= kMaxStackMallocSize; 1073800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1074800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsBefore = AllocaVec[0]; 1075800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsBefore); 1076800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1077800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1078800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize); 1079800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *MyAlloca = 1080800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore); 1081800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MyAlloca->setAlignment(RedzoneSize); 1082800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(MyAlloca->isStaticAlloca()); 1083800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy); 1084800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LocalStackBase = OrigStackBase; 1085800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1086800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1087800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AsanStackMallocFunc = M.getOrInsertFunction( 1088800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL); 1089800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc, 1090800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase); 1091800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1092800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1093800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // This string will be parsed by the run-time (DescribeStackAddress). 1094800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallString<2048> StackDescriptionStorage; 1095800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany raw_svector_ostream StackDescription(StackDescriptionStorage); 1096800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << F.getName() << " " << AllocaVec.size() << " "; 1097800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1098800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 1099800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Replace Alloca instructions with base+offset. 1100800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 1101800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 1102800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 1103800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Name = AI->getName(); 1104800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << Pos << " " << SizeInBytes << " " 1105800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany << Name.size() << " " << Name << " "; 1106800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1107800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert((AlignedSize % RedzoneSize) == 0); 1108800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->replaceAllUsesWith( 1109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr( 1110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)), 1111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->getType())); 1112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize + RedzoneSize; 1113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(Pos == LocalStackSize); 1115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Write the Magic value and the frame description constant to the redzone. 1117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus0 = IRB.CreateIntToPtr(LocalStackBase, IntptrPtrTy); 1118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(ConstantInt::get(IntptrTy, kCurrentStackFrameMagic), 1119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus1 = IRB.CreateAdd(LocalStackBase, 1121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LongSize/8)); 1122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy); 1123800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Description = IRB.CreatePointerCast( 1124800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany createPrivateGlobalForString(M, StackDescription.str()), 1125800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy); 1126800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Description, BasePlus1); 1127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the stack redzones at the entry. 1129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase = memToShadow(LocalStackBase, IRB); 1130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRB, ShadowBase, true); 1131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AsanStackFreeFunc = NULL; 1133800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1134800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanStackFreeFunc = M.getOrInsertFunction( 1135800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackFreeName, IRB.getVoidTy(), 1136800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy, IntptrTy, IntptrTy, NULL); 1137800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1138800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1139800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack before all ret instructions. 1140800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = RetVec.size(); i < n; i++) { 1141800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Ret = RetVec[i]; 1142800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRBRet(Ret); 1143800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1144800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Mark the current frame as retired. 1145800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateStore(ConstantInt::get(IntptrTy, kRetiredStackFrameMagic), 1146800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1147800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack. 1148800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRBRet, ShadowBase, false); 1149800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1150800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1151800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateCall3(AsanStackFreeFunc, LocalStackBase, 1152800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), 1153800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OrigStackBase); 1154800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1155800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1156800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1157800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugStack) { 1158800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 1159800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1160800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 1162800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1163