AddressSanitizer.cpp revision 407790604b8f71f7172bbdfb76c27e1799d241c2
1800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===-- AddressSanitizer.cpp - memory error detector ------------*- C++ -*-===// 2800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 3800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The LLVM Compiler Infrastructure 4800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 5800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This file is distributed under the University of Illinois Open Source 6800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// License. See LICENSE.TXT for details. 7800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 8800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===----------------------------------------------------------------------===// 9800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 10800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This file is a part of AddressSanitizer, an address sanity checker. 11800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Details of the algorithm: 12800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// http://code.google.com/p/address-sanitizer/wiki/AddressSanitizerAlgorithm 13800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 14800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany//===----------------------------------------------------------------------===// 15800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 16800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#define DEBUG_TYPE "asan" 17800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 18b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany#include "BlackList.h" 1906cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Function.h" 2006cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/IRBuilder.h" 21f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany#include "llvm/InlineAsm.h" 2206cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/IntrinsicInst.h" 2306cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/LLVMContext.h" 2406cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Module.h" 2506cb8ed00696eb14d1b831921452e50ec0568ea2Chandler Carruth#include "llvm/Type.h" 26800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/ArrayRef.h" 27800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/OwningPtr.h" 28800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallSet.h" 29800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallString.h" 30800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallVector.h" 31800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/StringExtras.h" 3206fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov#include "llvm/ADT/Triple.h" 33800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/CommandLine.h" 34800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/DataTypes.h" 35800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/Debug.h" 36800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/raw_ostream.h" 37800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/system_error.h" 383574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow#include "llvm/DataLayout.h" 39800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetMachine.h" 40800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Instrumentation.h" 41800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/BasicBlockUtils.h" 42800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/ModuleUtils.h" 43800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 44800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include <string> 45800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include <algorithm> 46800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 47800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyusing namespace llvm; 48800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 49800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowScale = 3; 50800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset32 = 1ULL << 29; 51800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset64 = 1ULL << 44; 5206fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanovstatic const uint64_t kDefaultShadowOffsetAndroid = 0; 53800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 54800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const size_t kMaxStackMallocSize = 1 << 16; // 64K 55800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3; 56800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kRetiredStackFrameMagic = 0x45E0360E; 57800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 58800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanModuleCtorName = "asan.module_ctor"; 597bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanModuleDtorName = "asan.module_dtor"; 607bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const int kAsanCtorAndCtorPriority = 1; 61800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanReportErrorTemplate = "__asan_report_"; 62800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanRegisterGlobalsName = "__asan_register_globals"; 637bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals"; 649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic const char *kAsanPoisonGlobalsName = "__asan_before_dynamic_init"; 659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic const char *kAsanUnpoisonGlobalsName = "__asan_after_dynamic_init"; 66800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanInitName = "__asan_init"; 6795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryanystatic const char *kAsanHandleNoReturnName = "__asan_handle_no_return"; 68800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingOffsetName = "__asan_mapping_offset"; 69800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingScaleName = "__asan_mapping_scale"; 70800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackMallocName = "__asan_stack_malloc"; 71800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackFreeName = "__asan_stack_free"; 72800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 73800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackLeftRedzoneMagic = 0xf1; 74800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackMidRedzoneMagic = 0xf2; 75800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackRightRedzoneMagic = 0xf3; 76800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackPartialRedzoneMagic = 0xf4; 77800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 78c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany// Accesses sizes are powers of two: 1, 2, 4, 8, 16. 79c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanystatic const size_t kNumberOfAccessSizes = 5; 80c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 81800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Command-line flags. 82800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 83800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no-]asan-reads. 84800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentReads("asan-instrument-reads", 85800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument read instructions"), cl::Hidden, cl::init(true)); 86800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentWrites("asan-instrument-writes", 87800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument write instructions"), cl::Hidden, cl::init(true)); 88e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic cl::opt<bool> ClInstrumentAtomics("asan-instrument-atomics", 89e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::desc("instrument atomic instructions (rmw, cmpxchg)"), 90e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::Hidden, cl::init(true)); 916e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryanystatic cl::opt<bool> ClAlwaysSlowPath("asan-always-slow-path", 926e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany cl::desc("use instrumentation with slow path for all accesses"), 936e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany cl::Hidden, cl::init(false)); 94c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany// This flag limits the number of instructions to be instrumented 95324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// in any given BB. Normally, this should be set to unlimited (INT_MAX), 96324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// but due to http://llvm.org/bugs/show_bug.cgi?id=12652 we temporary 97324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// set it to 10000. 98324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryanystatic cl::opt<int> ClMaxInsnsToInstrumentPerBB("asan-max-ins-per-bb", 99324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::init(10000), 100324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::desc("maximal number of instructions to instrument in any given BB"), 101324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::Hidden); 102800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-stack. 103800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClStack("asan-stack", 104800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle stack memory"), cl::Hidden, cl::init(true)); 105800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-use-after-return. 106800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClUseAfterReturn("asan-use-after-return", 107800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Check return-after-free"), cl::Hidden, cl::init(false)); 108800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-globals. 109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClGlobals("asan-globals", 110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle global objects"), cl::Hidden, cl::init(true)); 1119b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic cl::opt<bool> ClInitializers("asan-initialization-order", 1129b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany cl::desc("Handle C++ initializer order"), cl::Hidden, cl::init(false)); 113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClMemIntrin("asan-memintrin", 114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle memset/memcpy/memmove"), cl::Hidden, cl::init(true)); 115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -fasan-blacklist. 116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClBlackListFile("asan-blacklist", 117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("File containing the list of functions to ignore " 118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "during instrumentation"), cl::Hidden); 119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// These flags allow to change the shadow mapping. 121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The shadow mapping looks like 122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Shadow = (Mem >> scale) + (1 << offset_log) 123800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingScale("asan-mapping-scale", 124800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("scale of asan shadow mapping"), cl::Hidden, cl::init(0)); 125800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingOffsetLog("asan-mapping-offset-log", 126800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("offset of asan shadow mapping"), cl::Hidden, cl::init(-1)); 127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Optimization flags. Not user visible, used mostly for testing 129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// and benchmarking the tool. 130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOpt("asan-opt", 131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Optimize instrumentation"), cl::Hidden, cl::init(true)); 132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptSameTemp("asan-opt-same-temp", 133800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Instrument the same temp just once"), cl::Hidden, 134800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(true)); 135800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptGlobals("asan-opt-globals", 136800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Don't instrument scalar globals"), cl::Hidden, cl::init(true)); 137800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 138800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Debug flags. 139800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebug("asan-debug", cl::desc("debug"), cl::Hidden, 140800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(0)); 141800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugStack("asan-debug-stack", cl::desc("debug stack"), 142800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(0)); 143800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClDebugFunc("asan-debug-func", 144800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::desc("Debug func")); 145800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMin("asan-debug-min", cl::desc("Debug min inst"), 146800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 147800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMax("asan-debug-max", cl::desc("Debug man inst"), 148800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 149800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 150800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanynamespace { 151ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany/// A set of dynamically initialized globals extracted from metadata. 152ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryanyclass SetOfDynamicallyInitializedGlobals { 153ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany public: 154ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany void Init(Module& M) { 155ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // Clang generates metadata identifying all dynamically initialized globals. 156ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany NamedMDNode *DynamicGlobals = 157ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany M.getNamedMetadata("llvm.asan.dynamically_initialized_globals"); 158ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany if (!DynamicGlobals) 159ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany return; 160ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany for (int i = 0, n = DynamicGlobals->getNumOperands(); i < n; ++i) { 161ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany MDNode *MDN = DynamicGlobals->getOperand(i); 162ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany assert(MDN->getNumOperands() == 1); 163ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany Value *VG = MDN->getOperand(0); 164ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // The optimizer may optimize away a global entirely, in which case we 165ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // cannot instrument access to it. 166ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany if (!VG) 167ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany continue; 168ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany DynInitGlobals.insert(cast<GlobalVariable>(VG)); 169ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany } 170ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany } 171ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany bool Contains(GlobalVariable *G) { return DynInitGlobals.count(G) != 0; } 172ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany private: 173ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany SmallSet<GlobalValue*, 32> DynInitGlobals; 174ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany}; 175ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany 176ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany 177800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany/// AddressSanitizer: instrument the code in module to find memory bugs. 178ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanystruct AddressSanitizer : public FunctionPass { 179800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AddressSanitizer(); 18025878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko virtual const char *getPassName() const; 181ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentMop(Instruction *I); 182ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentAddress(Instruction *OrigIns, IRBuilder<> &IRB, 183800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, uint32_t TypeSize, bool IsWrite); 184c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 185c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, uint32_t TypeSize); 186ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *generateCrashCode(Instruction *InsertBefore, Value *Addr, 1872735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany bool IsWrite, size_t AccessSizeIndex); 188ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool instrumentMemIntrinsic(MemIntrinsic *MI); 189ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentMemIntrinsicParam(Instruction *OrigIns, Value *Addr, 190c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Size, 191800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore, bool IsWrite); 192800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *memToShadow(Value *Shadow, IRBuilder<> &IRB); 193ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool runOnFunction(Function &F); 1949b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void createInitializerPoisonCalls(Module &M, 1959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstAddr, Value *LastAddr); 196a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany bool maybeInsertAsanInitAtFunctionEntry(Function &F); 197ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool poisonStackInFunction(Function &F); 198ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany virtual bool doInitialization(Module &M); 199ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany virtual bool doFinalization(Module &M); 200800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool insertGlobalRedzones(Module &M); 201800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany static char ID; // Pass identification, replacement for typeid 202800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 203800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 204800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAllocaSizeInBytes(AllocaInst *AI) { 205800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = AI->getAllocatedType(); 206d8313be41031e4d768f5b38199904d4debff88cdEvgeniy Stepanov uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 207800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return SizeInBytes; 208800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 209800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedSize(uint64_t SizeInBytes) { 210800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return ((SizeInBytes + RedzoneSize - 1) 211800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany / RedzoneSize) * RedzoneSize; 212800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 213800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t getAlignedAllocaSize(AllocaInst *AI) { 214800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 215800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return getAlignedSize(SizeInBytes); 216800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 217800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 21855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *checkInterfaceFunction(Constant *FuncOrBitcast); 2199b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool ShouldInstrumentGlobal(GlobalVariable *G); 220800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany void PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, 221800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison); 2225a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany bool LooksLikeCodeInBug11395(Instruction *I); 2239b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void FindDynamicInitializers(Module &M); 224800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 225800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LLVMContext *C; 2263574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow DataLayout *TD; 227800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t MappingOffset; 228800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int MappingScale; 229800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize; 230800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int LongSize; 231800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrTy; 232800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrPtrTy; 233800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanCtorFunction; 234800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanInitFunction; 235ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Function *AsanStackMallocFunc, *AsanStackFreeFunc; 236ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Function *AsanHandleNoReturnFunc; 237800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *CtorInsertBefore; 238b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany OwningPtr<BlackList> BL; 2399db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // This array is indexed by AccessIsWrite and log2(AccessSize). 2409db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany Function *AsanErrorCallback[2][kNumberOfAccessSizes]; 241f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany InlineAsm *EmptyAsm; 242a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany SmallSet<GlobalValue*, 32> GlobalsCreatedByAsan; 243ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals; 244800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 245c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 246800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} // namespace 247800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 248800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanychar AddressSanitizer::ID = 0; 249800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyINITIALIZE_PASS(AddressSanitizer, "asan", 250800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs.", 251800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany false, false) 252ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya SerebryanyAddressSanitizer::AddressSanitizer() : FunctionPass(ID) { } 253ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya SerebryanyFunctionPass *llvm::createAddressSanitizerPass() { 254800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new AddressSanitizer(); 255800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 256800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 25725878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenkoconst char *AddressSanitizer::getPassName() const { 25825878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko return "AddressSanitizer"; 25925878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko} 26025878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko 2612735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryanystatic size_t TypeSizeToSizeIndex(uint32_t TypeSize) { 2622735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany size_t Res = CountTrailingZeros_32(TypeSize / 8); 2632735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany assert(Res < kNumberOfAccessSizes); 2642735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany return Res; 2652735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany} 2662735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany 267800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Create a constant for Str so that we can pass it to the run-time lib. 268800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) { 26918c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str); 270800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new GlobalVariable(M, StrConst->getType(), true, 271800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::PrivateLinkage, StrConst, ""); 272800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 273800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 274800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyValue *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) { 275800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Shadow >> scale 276800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Shadow = IRB.CreateLShr(Shadow, MappingScale); 277800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (MappingOffset == 0) 278800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Shadow; 279800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Shadow >> scale) | offset 280800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return IRB.CreateOr(Shadow, ConstantInt::get(IntptrTy, 281800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset)); 282800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 283800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 284c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanyvoid AddressSanitizer::instrumentMemIntrinsicParam( 285ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Instruction *OrigIns, 286800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) { 287800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the first byte. 288800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 289800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 290ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(OrigIns, IRB, Addr, 8, IsWrite); 291800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 292800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the last byte. 293800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 294800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 295800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *SizeMinusOne = IRB.CreateSub( 296800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Size, ConstantInt::get(Size->getType(), 1)); 297800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SizeMinusOne = IRB.CreateIntCast(SizeMinusOne, IntptrTy, false); 298800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 299800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrPlusSizeMinisOne = IRB.CreateAdd(AddrLong, SizeMinusOne); 300ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(OrigIns, IRB, AddrPlusSizeMinisOne, 8, IsWrite); 301800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 302800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 303800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 304800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Instrument memset/memmove/memcpy 305ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::instrumentMemIntrinsic(MemIntrinsic *MI) { 306800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Dst = MI->getDest(); 307800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI); 3082735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany Value *Src = MemTran ? MemTran->getSource() : 0; 309800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Length = MI->getLength(); 310800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 311800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *ConstLength = dyn_cast<Constant>(Length); 312800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore = MI; 313800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength) { 314800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength->isNullValue()) return false; 315800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 316800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // The size is not a constant so it could be zero -- check at run-time. 317800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 318800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 319800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(Length, 32056139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Constant::getNullValue(Length->getType())); 3214a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov InsertBefore = SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false); 322800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 323800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 324ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsicParam(MI, Dst, Length, InsertBefore, true); 325800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Src) 326ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsicParam(MI, Src, Length, InsertBefore, false); 327800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 328800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 329800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 330e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// If I is an interesting memory access, return the PointerOperand 331e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// and set IsWrite. Otherwise return NULL. 332e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic Value *isInterestingMemoryAccess(Instruction *I, bool *IsWrite) { 333800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 334e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentReads) return NULL; 335e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = false; 336800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return LI->getPointerOperand(); 337800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 338e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (StoreInst *SI = dyn_cast<StoreInst>(I)) { 339e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentWrites) return NULL; 340e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 341e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return SI->getPointerOperand(); 342e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 343e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(I)) { 344e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 345e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 346e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return RMW->getPointerOperand(); 347e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 348e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicCmpXchgInst *XCHG = dyn_cast<AtomicCmpXchgInst>(I)) { 349e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 350e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 351e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return XCHG->getPointerOperand(); 352e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 353e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return NULL; 354800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 355800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 356ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanyvoid AddressSanitizer::instrumentMop(Instruction *I) { 3573780ad8b998d93d7db406919c06137cdb786ef05Axel Naumann bool IsWrite = false; 358e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany Value *Addr = isInterestingMemoryAccess(I, &IsWrite); 359e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany assert(Addr); 3609b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClOpt && ClOptGlobals) { 3619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (GlobalVariable *G = dyn_cast<GlobalVariable>(Addr)) { 3629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If initialization order checking is disabled, a simple access to a 3639b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // dynamically initialized global is always valid. 3649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!ClInitializers) 3659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 3669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If a global variable does not have dynamic initialization we don't 367407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany // have to instrument it. However, if a global does not have initailizer 368407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany // at all, we assume it has dynamic initializer (in other TU). 369407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany if (G->hasInitializer() && !DynamicallyInitializedGlobals.Contains(G)) 3709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 3719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 372800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 3739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 374800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigPtrTy = Addr->getType(); 375800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 376800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 377800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(OrigTy->isSized()); 378800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 379800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 380800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize != 8 && TypeSize != 16 && 381800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 382800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all unusual sizes. 383800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 384800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 385800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 386800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(I); 387ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(I, IRB, Addr, TypeSize, IsWrite); 388800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 389800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 39055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// Validate the result of Module::getOrInsertFunction called for an interface 39155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// function of AddressSanitizer. If the instrumented module defines a function 39255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// with the same name, their prototypes must match, otherwise 39355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// getOrInsertFunction returns a bitcast. 39455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander PotapenkoFunction *AddressSanitizer::checkInterfaceFunction(Constant *FuncOrBitcast) { 39555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast); 39655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko FuncOrBitcast->dump(); 39755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko report_fatal_error("trying to redefine an AddressSanitizer " 39855cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko "interface function"); 39955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko} 40055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko 401800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyInstruction *AddressSanitizer::generateCrashCode( 402ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *InsertBefore, Value *Addr, 4034f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany bool IsWrite, size_t AccessSizeIndex) { 404ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany IRBuilder<> IRB(InsertBefore); 405ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CallInst *Call = IRB.CreateCall(AsanErrorCallback[IsWrite][AccessSizeIndex], 406ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Addr); 407f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We don't do Call->setDoesNotReturn() because the BB already has 408f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // UnreachableInst at the end. 409f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // This EmptyAsm is required to avoid callback merge. 410f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany IRB.CreateCall(EmptyAsm); 4113c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany return Call; 412800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 413800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 4142735cf4aa52e31b8d2de90f836c3ad991215e04eKostya SerebryanyValue *AddressSanitizer::createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 415c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, 416c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany uint32_t TypeSize) { 417c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany size_t Granularity = 1 << MappingScale; 418c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // Addr & (Granularity - 1) 419c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *LastAccessedByte = IRB.CreateAnd( 420c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany AddrLong, ConstantInt::get(IntptrTy, Granularity - 1)); 421c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (Addr & (Granularity - 1)) + size - 1 422c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany if (TypeSize / 8 > 1) 423c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateAdd( 424c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1)); 425c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (uint8_t) ((Addr & (Granularity-1)) + size - 1) 426c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateIntCast( 4276e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany LastAccessedByte, ShadowValue->getType(), false); 428c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue 429c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany return IRB.CreateICmpSGE(LastAccessedByte, ShadowValue); 430c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany} 431c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 432ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanyvoid AddressSanitizer::instrumentAddress(Instruction *OrigIns, 433800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, 434800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize, bool IsWrite) { 435800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 436800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 437800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowTy = IntegerType::get( 438800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *C, std::max(8U, TypeSize >> MappingScale)); 439800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowPtrTy = PointerType::get(ShadowTy, 0); 440800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowPtr = memToShadow(AddrLong, IRB); 441800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *CmpVal = Constant::getNullValue(ShadowTy); 442800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowValue = IRB.CreateLoad( 443800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy)); 444800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 445800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal); 44611c2a47af825a0f89d75aaa97ad873ed2acef266Kostya Serebryany size_t AccessSizeIndex = TypeSizeToSizeIndex(TypeSize); 447800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Granularity = 1 << MappingScale; 448ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany TerminatorInst *CrashTerm = 0; 449ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 4506e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany if (ClAlwaysSlowPath || (TypeSize < 8 * Granularity)) { 4514a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov TerminatorInst *CheckTerm = 4524a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false); 453ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany assert(dyn_cast<BranchInst>(CheckTerm)->isUnconditional()); 454f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BasicBlock *NextBB = CheckTerm->getSuccessor(0); 455c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany IRB.SetInsertPoint(CheckTerm); 456c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Cmp2 = createSlowPathCmp(IRB, AddrLong, ShadowValue, TypeSize); 457ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany BasicBlock *CrashBlock = 458ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany BasicBlock::Create(*C, "", NextBB->getParent(), NextBB); 459ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CrashTerm = new UnreachableInst(*C, CrashBlock); 460f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BranchInst *NewTerm = BranchInst::Create(CrashBlock, NextBB, Cmp2); 461f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany ReplaceInstWithInst(CheckTerm, NewTerm); 462c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany } else { 4634a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov CrashTerm = SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), true); 464800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 465ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 466ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *Crash = 467ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany generateCrashCode(CrashTerm, AddrLong, IsWrite, AccessSizeIndex); 468ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Crash->setDebugLoc(OrigIns->getDebugLoc()); 469800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 470800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 4719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanyvoid AddressSanitizer::createInitializerPoisonCalls(Module &M, 4729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstAddr, 4739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *LastAddr) { 4749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // We do all of our poisoning and unpoisoning within _GLOBAL__I_a. 4759b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *GlobalInit = M.getFunction("_GLOBAL__I_a"); 4769b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If that function is not present, this TU contains no globals, or they have 4779b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // all been optimized away 4789b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!GlobalInit) 4799b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 4809b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 4819b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Set up the arguments to our poison/unpoison functions. 4829b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRBuilder<> IRB(GlobalInit->begin()->getFirstInsertionPt()); 4839b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 4849b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Declare our poisoning and unpoisoning functions. 4859b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *AsanPoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 4869b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanPoisonGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 4879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany AsanPoisonGlobals->setLinkage(Function::ExternalLinkage); 4889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *AsanUnpoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 4899b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanUnpoisonGlobalsName, IRB.getVoidTy(), NULL)); 4909b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany AsanUnpoisonGlobals->setLinkage(Function::ExternalLinkage); 4919b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 4929b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add a call to poison all external globals before the given function starts. 4939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRB.CreateCall2(AsanPoisonGlobals, FirstAddr, LastAddr); 4949b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 4959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add calls to unpoison all globals before each return instruction. 4969b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Function::iterator I = GlobalInit->begin(), E = GlobalInit->end(); 4979b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany I != E; ++I) { 4989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ReturnInst *RI = dyn_cast<ReturnInst>(I->getTerminator())) { 4999b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany CallInst::Create(AsanUnpoisonGlobals, "", RI); 5009b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5019b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5029b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 5039b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5049b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanybool AddressSanitizer::ShouldInstrumentGlobal(GlobalVariable *G) { 5059b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Type *Ty = cast<PointerType>(G->getType())->getElementType(); 506324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "GLOBAL: " << *G << "\n"); 5079b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 50859a4a47a7bea7cc17877c6a3954ad9f8309ff1cbKostya Serebryany if (BL->isIn(*G)) return false; 5099b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!Ty->isSized()) return false; 5109b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!G->hasInitializer()) return false; 5119ce84c1c95c0153a2f33e188ce0db00770425f9eAlexey Samsonov if (GlobalsCreatedByAsan.count(G)) return false; // Our own global. 5129b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Touch only those globals that will not be defined in other modules. 5139b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Don't handle ODR type linkages since other modules may be built w/o asan. 5149b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 5159b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::PrivateLinkage && 5169b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::InternalLinkage) 5179b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5189b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Two problems with thread-locals: 5199b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - The address of the main thread's copy can't be computed at link-time. 5209b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - Need to poison all copies, not just the main thread's one. 5219b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->isThreadLocal()) 5229b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5239b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // For now, just ignore this Alloca if the alignment is large. 5249b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getAlignment() > RedzoneSize) return false; 5259b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5269b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore all the globals with the names starting with "\01L_OBJC_". 5279b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Many of those are put into the .cstring section. The linker compresses 5289b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // that section by removing the spare \0s after the string terminator, so 5299b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // our redzones get broken. 5309b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((G->getName().find("\01L_OBJC_") == 0) || 5319b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (G->getName().find("\01l_OBJC_") == 0)) { 5329b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G); 5339b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5369b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->hasSection()) { 5379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany StringRef Section(G->getSection()); 5389b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore the globals from the __OBJC section. The ObjC runtime assumes 5399b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to 5409b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // them. 5419b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((Section.find("__OBJC,") == 0) || 5429b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (Section.find("__DATA, __objc_") == 0)) { 5439b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G); 5449b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5459b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5469b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // See http://code.google.com/p/address-sanitizer/issues/detail?id=32 5479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Constant CFString instances are compiled in the following way: 5489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the string buffer is emitted into 5499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // __TEXT,__cstring,cstring_literals 5509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the constant NSConstantString structure referencing that buffer 5519b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // is placed into __DATA,__cfstring 5529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Therefore there's no point in placing redzones into __DATA,__cfstring. 5539b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Moreover, it causes the linker to crash on OS X 10.7 5549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (Section.find("__DATA,__cfstring") == 0) { 5559b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring CFString: " << *G); 5569b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 5579b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5589b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 5599b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 5609b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return true; 5619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 5629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 563800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This function replaces all global variables with new variables that have 564800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// trailing redzones. It also creates a function that poisons 565800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// redzones and inserts this function into llvm.global_ctors. 566800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanybool AddressSanitizer::insertGlobalRedzones(Module &M) { 567800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<GlobalVariable *, 16> GlobalsToChange; 568800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5699b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Module::GlobalListType::iterator G = M.global_begin(), 5709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany E = M.global_end(); G != E; ++G) { 5719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ShouldInstrumentGlobal(G)) 5729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany GlobalsToChange.push_back(G); 573800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 574800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 575800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t n = GlobalsToChange.size(); 576800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (n == 0) return false; 577800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 578800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A global is described by a structure 579800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t beg; 580800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size; 581800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size_with_redzone; 582800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // const char *name; 5839b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // size_t has_dynamic_init; 584800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We initialize an array of such structures and pass it to a run-time call. 585800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy, 5869b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, IntptrTy, 5879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, NULL); 5889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany SmallVector<Constant *, 16> Initializers(n), DynamicInit; 589800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 590800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 591800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 5929b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // The addresses of the first and last dynamically initialized globals in 5939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // this TU. Used in initialization order checking. 5949b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstDynamic = 0, *LastDynamic = 0; 5959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 596800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < n; i++) { 597800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *G = GlobalsToChange[i]; 598800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PointerType *PtrTy = cast<PointerType>(G->getType()); 599800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = PtrTy->getElementType(); 600208a4ff2b56f453910bb817540f34b8169f7702aKostya Serebryany uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 601800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t RightRedzoneSize = RedzoneSize + 602800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (RedzoneSize - (SizeInBytes % RedzoneSize)); 603800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize); 6049b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Determine whether this global should be poisoned in initialization. 605ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany bool GlobalHasDynamicInitializer = 606ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany DynamicallyInitializedGlobals.Contains(G); 60759a4a47a7bea7cc17877c6a3954ad9f8309ff1cbKostya Serebryany // Don't check initialization order if this global is blacklisted. 6087dadac65d375ff21b7a36bfb7642578d2f467525Kostya Serebryany GlobalHasDynamicInitializer &= !BL->isInInit(*G); 609800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 610800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL); 611800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *NewInitializer = ConstantStruct::get( 612800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewTy, G->getInitializer(), 613800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(RightRedZoneTy), NULL); 614800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 615a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany SmallString<2048> DescriptionOfGlobal = G->getName(); 616a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += " ("; 617a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += M.getModuleIdentifier(); 618a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += ")"; 619a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal); 620800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 621800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Create a new global variable with enough space for a redzone. 622800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *NewGlobal = new GlobalVariable( 623800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, NewTy, G->isConstant(), G->getLinkage(), 624ce718ff9f42c7da092eaa01dd0242e8d5ba84713Hans Wennborg NewInitializer, "", G, G->getThreadLocalMode()); 625800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->copyAttributesFrom(G); 626800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->setAlignment(RedzoneSize); 627800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 628800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Indices2[2]; 629800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[0] = IRB.getInt32(0); 630800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[1] = IRB.getInt32(0); 631800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 632800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->replaceAllUsesWith( 633f1639abf1aaba1448f719f595156cd0f4cd560ccKostya Serebryany ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true)); 634800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->takeName(G); 635800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->eraseFromParent(); 636800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 637800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Initializers[i] = ConstantStruct::get( 638800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalStructTy, 639800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(NewGlobal, IntptrTy), 640800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes), 641800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize), 642800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(Name, IntptrTy), 6439b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany ConstantInt::get(IntptrTy, GlobalHasDynamicInitializer), 644800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NULL); 6459b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 6469b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Populate the first and last globals declared in this TU. 6479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClInitializers && GlobalHasDynamicInitializer) { 6489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany LastDynamic = ConstantExpr::getPointerCast(NewGlobal, IntptrTy); 6499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (FirstDynamic == 0) 6509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany FirstDynamic = LastDynamic; 6519b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 6529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 653324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "NEW GLOBAL: " << *NewGlobal << "\n"); 654800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 655800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 656800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n); 657800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *AllGlobals = new GlobalVariable( 658800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage, 659800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantArray::get(ArrayOfGlobalStructTy, Initializers), ""); 660800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Create calls for poisoning before initializers run and unpoisoning after. 6629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClInitializers && FirstDynamic && LastDynamic) 6639b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany createInitializerPoisonCalls(M, FirstDynamic, LastDynamic); 6649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 66555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanRegisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 6669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany kAsanRegisterGlobalsName, IRB.getVoidTy(), 6679b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, IntptrTy, NULL)); 668800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanRegisterGlobals->setLinkage(Function::ExternalLinkage); 669800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 670800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall2(AsanRegisterGlobals, 671800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 672800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, n)); 673800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6747bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // We also need to unregister globals at the end, e.g. when a shared library 6757bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // gets closed. 6767bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanDtorFunction = Function::Create( 6777bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 6787bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleDtorName, &M); 6797bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction); 6807bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB)); 68155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko Function *AsanUnregisterGlobals = 68255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko checkInterfaceFunction(M.getOrInsertFunction( 68355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko kAsanUnregisterGlobalsName, 68455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 6857bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage); 6867bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 6877bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB_Dtor.CreateCall2(AsanUnregisterGlobals, 6887bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 6897bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany ConstantInt::get(IntptrTy, n)); 6907bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalDtors(M, AsanDtorFunction, kAsanCtorAndCtorPriority); 6917bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 692800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << M); 693800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 694800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 695800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 696800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// virtual 697ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::doInitialization(Module &M) { 698800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Initialize the private fields. No one has accessed them before. 6993574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow TD = getAnalysisIfAvailable<DataLayout>(); 700ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 701800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TD) 702800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 703b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany BL.reset(new BlackList(ClBlackListFile)); 704ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany DynamicallyInitializedGlobals.Init(M); 705800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 706800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany C = &(M.getContext()); 707426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth LongSize = TD->getPointerSizeInBits(); 708800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrTy = Type::getIntNTy(*C, LongSize); 709800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IntptrPtrTy = PointerType::get(IntptrTy, 0); 710800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 711800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanCtorFunction = Function::Create( 712800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 713800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalValue::InternalLinkage, kAsanModuleCtorName, &M); 714800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction); 715800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany CtorInsertBefore = ReturnInst::Create(*C, AsanCtorBB); 716800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 717800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // call __asan_init in the module ctor. 718800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(CtorInsertBefore); 71955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko AsanInitFunction = checkInterfaceFunction( 720800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL)); 721800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AsanInitFunction->setLinkage(Function::ExternalLinkage); 722800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall(AsanInitFunction); 723800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7249db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // Create __asan_report* callbacks. 7259db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessIsWrite = 0; AccessIsWrite <= 1; AccessIsWrite++) { 7269db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessSizeIndex = 0; AccessSizeIndex < kNumberOfAccessSizes; 7279db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany AccessSizeIndex++) { 7289db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // IsWrite and TypeSize are encoded in the function name. 7299db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany std::string FunctionName = std::string(kAsanReportErrorTemplate) + 7309db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany (AccessIsWrite ? "store" : "load") + itostr(1 << AccessSizeIndex); 7314f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany // If we are merging crash callbacks, they have two parameters. 7327846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany AsanErrorCallback[AccessIsWrite][AccessSizeIndex] = 7337846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany checkInterfaceFunction(M.getOrInsertFunction( 7347846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany FunctionName, IRB.getVoidTy(), IntptrTy, NULL)); 7359db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 7369db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 737ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 738ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany AsanStackMallocFunc = checkInterfaceFunction(M.getOrInsertFunction( 739ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL)); 740ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany AsanStackFreeFunc = checkInterfaceFunction(M.getOrInsertFunction( 741ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany kAsanStackFreeName, IRB.getVoidTy(), 742ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany IntptrTy, IntptrTy, IntptrTy, NULL)); 743ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany AsanHandleNoReturnFunc = checkInterfaceFunction(M.getOrInsertFunction( 744ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany kAsanHandleNoReturnName, IRB.getVoidTy(), NULL)); 745ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 746f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We insert an empty inline asm after __asan_report* to avoid callback merge. 747f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false), 748f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany StringRef(""), StringRef(""), 749f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany /*hasSideEffects=*/true); 7509db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany 75106fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov llvm::Triple targetTriple(M.getTargetTriple()); 75243bf70986bb13c812e87ca959dd8f2dd9edf802cLogan Chien bool isAndroid = targetTriple.getEnvironment() == llvm::Triple::Android; 75306fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov 75406fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov MappingOffset = isAndroid ? kDefaultShadowOffsetAndroid : 75506fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov (LongSize == 32 ? kDefaultShadowOffset32 : kDefaultShadowOffset64); 756800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog >= 0) { 757800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingOffsetLog == 0) { 758800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // special case 759800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 0; 760800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 761800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingOffset = 1ULL << ClMappingOffsetLog; 762800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 763800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 764800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = kDefaultShadowScale; 765800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClMappingScale) { 766800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MappingScale = ClMappingScale; 767800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 768800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Redzone used for stack and globals is at least 32 bytes. 769800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively. 770800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize = std::max(32, (int)(1 << MappingScale)); 771800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 772800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7738c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingOffsetLog >= 0) { 7748c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Tell the run-time the current values of mapping offset and scale. 7758c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_offset = 7768c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 7778c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingOffset), 7788c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingOffsetName); 7798c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 7808c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_offset, true); 7818c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 7828c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany if (ClMappingScale) { 7838c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany GlobalValue *asan_mapping_scale = 7848c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 7858c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany ConstantInt::get(IntptrTy, MappingScale), 7868c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany kAsanMappingScaleName); 7878c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany // Read the global, otherwise it may be optimized away. 7888c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany IRB.CreateLoad(asan_mapping_scale, true); 7898c0134a77615b66f57250f0662bc899e4574551eKostya Serebryany } 790800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7917bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority); 7929b02741d2284d9516a59666c211fe1f57e8803adKostya Serebryany 793ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany return true; 794ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany} 795ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 796ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::doFinalization(Module &M) { 797ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany // We transform the globals at the very end so that the optimization analysis 798ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany // works on the original globals. 799ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany if (ClGlobals) 800ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany return insertGlobalRedzones(M); 801ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany return false; 802800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 803800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 804ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 805a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryanybool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) { 806a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // For each NSObject descendant having a +load method, this method is invoked 807a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // by the ObjC runtime before any of the static constructors is called. 808a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // Therefore we need to instrument such methods with a call to __asan_init 809a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // at the beginning in order to initialize our runtime before any access to 810a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // the shadow memory. 811a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // We cannot just ignore these methods, because they may call other 812a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // instrumented functions. 813a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany if (F.getName().find(" load]") != std::string::npos) { 814a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRBuilder<> IRB(F.begin()->begin()); 815a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRB.CreateCall(AsanInitFunction); 816a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return true; 817a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany } 818a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return false; 819a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany} 820a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 821ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::runOnFunction(Function &F) { 822800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (BL->isIn(F)) return false; 823800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (&F == AsanCtorFunction) return false; 824324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "ASAN instrumenting:\n" << F << "\n"); 825a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 826a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // If needed, insert __asan_init before checking for AddressSafety attr. 827a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany maybeInsertAsanInitAtFunctionEntry(F); 828a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 8296765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling if (!F.getFnAttributes().hasAttribute(Attributes::AddressSafety)) 8306765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling return false; 831800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 832800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClDebugFunc.empty() && ClDebugFunc != F.getName()) 833800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 8346765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling 8356765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling // We want to instrument every address only once per basic block (unless there 8366765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling // are calls between uses). 837800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallSet<Value*, 16> TempsToInstrument; 838800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 16> ToInstrument; 83995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany SmallVector<Instruction*, 8> NoReturnCalls; 840e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 841800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 842800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Fill the set of memory operations to instrument. 843800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 844800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 845800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 846324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany int NumInsnsPerBB = 0; 847800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); 848800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 849bcb55ce3862bbbedac4e09d7099c9e0efc434e4bKostya Serebryany if (LooksLikeCodeInBug11395(BI)) return false; 850e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (Value *Addr = isInterestingMemoryAccess(BI, &IsWrite)) { 851800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptSameTemp) { 852800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TempsToInstrument.insert(Addr)) 853800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; // We've seen this temp in the current BB. 854800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 855800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (isa<MemIntrinsic>(BI) && ClMemIntrin) { 856800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ok, take it. 857800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 85895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CallInst *CI = dyn_cast<CallInst>(BI)) { 859800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A call inside BB. 860800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 86195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CI->doesNotReturn()) { 86295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany NoReturnCalls.push_back(CI); 86395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 864800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 865800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 866800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 867800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ToInstrument.push_back(BI); 868324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany NumInsnsPerBB++; 869324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany if (NumInsnsPerBB >= ClMaxInsnsToInstrumentPerBB) 870324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany break; 871800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 872800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 873800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 874800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Instrument. 875800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int NumInstrumented = 0; 876800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = ToInstrument.size(); i != n; i++) { 877800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Inst = ToInstrument[i]; 878800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugMin < 0 || ClDebugMax < 0 || 879800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) { 880e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (isInterestingMemoryAccess(Inst, &IsWrite)) 881ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMop(Inst); 882800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany else 883ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsic(cast<MemIntrinsic>(Inst)); 884800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 885800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NumInstrumented++; 886800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 887800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 888ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool ChangedStack = poisonStackInFunction(F); 88995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 89095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // We must unpoison the stack before every NoReturn call (throw, _exit, etc). 89195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37 89295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) { 89395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany Instruction *CI = NoReturnCalls[i]; 89495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRBuilder<> IRB(CI); 895ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany IRB.CreateCall(AsanHandleNoReturnFunc); 89695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 897324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "ASAN done instrumenting:\n" << F << "\n"); 89895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 89995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty(); 900800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 901800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 902800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) { 903800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 1) return PoisonByte; 904800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 2) return (PoisonByte << 8) + PoisonByte; 905800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 4) 906800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return (PoisonByte << 24) + (PoisonByte << 16) + 907800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (PoisonByte << 8) + (PoisonByte); 908858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper llvm_unreachable("ShadowRedzoneSize is either 1, 2 or 4"); 909800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 910800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 911800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic void PoisonShadowPartialRightRedzone(uint8_t *Shadow, 912800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Size, 913800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t RedzoneSize, 914800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowGranularity, 915800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint8_t Magic) { 916800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < RedzoneSize; 917800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany i+= ShadowGranularity, Shadow++) { 918800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (i + ShadowGranularity <= Size) { 919800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = 0; // fully addressable 920800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (i >= Size) { 921800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Magic; // unaddressable 922800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 923800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Size - i; // first Size-i bytes are addressable 924800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 925800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 926800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 927800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 928800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyvoid AddressSanitizer::PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, 929800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB, 930800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase, bool DoPoison) { 931800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowRZSize = RedzoneSize >> MappingScale; 932800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowRZSize >= 1 && ShadowRZSize <= 4); 933800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8); 934800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZPtrTy = PointerType::get(RZTy, 0); 935800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 936800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonLeft = ConstantInt::get(RZTy, 937800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackLeftRedzoneMagic : 0LL, ShadowRZSize)); 938800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonMid = ConstantInt::get(RZTy, 939800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackMidRedzoneMagic : 0LL, ShadowRZSize)); 940800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonRight = ConstantInt::get(RZTy, 941800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackRightRedzoneMagic : 0LL, ShadowRZSize)); 942800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 943800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison the first red zone. 944800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy)); 945800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 946800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison all other red zones. 947800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 948800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 949800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 950800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 951800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 952800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(AlignedSize - SizeInBytes < RedzoneSize); 953800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Ptr = NULL; 954800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 955800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize; 956800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 957800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowBase->getType() == IntptrTy); 958800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (SizeInBytes < AlignedSize) { 959800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the partial redzone at right 960800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd( 961800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ShadowBase, ConstantInt::get(IntptrTy, 962800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (Pos >> MappingScale) - ShadowRZSize)); 963800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t AddressableBytes = RedzoneSize - (AlignedSize - SizeInBytes); 964800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t Poison = 0; 965800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoPoison) { 966800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes, 967800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RedzoneSize, 968800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1ULL << MappingScale, 969800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackPartialRedzoneMagic); 970800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 971800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PartialPoison = ConstantInt::get(RZTy, Poison); 972800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PartialPoison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 973800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 974800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 975800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the full redzone at right. 976800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd(ShadowBase, 977800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, Pos >> MappingScale)); 978800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Poison = i == AllocaVec.size() - 1 ? PoisonRight : PoisonMid; 979800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 980800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 981800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += RedzoneSize; 982800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 983800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 984800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 9855a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// Workaround for bug 11395: we don't want to instrument stack in functions 9865a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany// with large assembly blobs (32-bit only), otherwise reg alloc may crash. 987d2703dec271d82c8c9d22afb835c07730fd25d47Kostya Serebryany// FIXME: remove once the bug 11395 is fixed. 9885a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryanybool AddressSanitizer::LooksLikeCodeInBug11395(Instruction *I) { 9895a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (LongSize != 32) return false; 9905a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany CallInst *CI = dyn_cast<CallInst>(I); 9915a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (!CI || !CI->isInlineAsm()) return false; 9925a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany if (CI->getNumArgOperands() <= 5) return false; 9935a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany // We have inline assembly with quite a few arguments. 9945a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany return true; 9955a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany} 9965a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany 997800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Find all static Alloca instructions and put 998800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// poisoned red zones around all of them. 999800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Then unpoison everything back before the function returns. 1000800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// 1001800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Stack poisoning does not play well with exception handling. 1002800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// When an exception is thrown, we essentially bypass the code 1003800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// that unpoisones the stack. This is why the run-time library has 1004800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// to intercept __cxa_throw (as well as longjmp, etc) and unpoison the entire 1005800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// stack in the interceptor. This however does not work inside the 1006800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// actual function which catches the exception. Most likely because the 1007800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// compiler hoists the load of the shadow value somewhere too high. 1008800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This causes asan to report a non-existing bug on 453.povray. 1009800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// It sounds like an LLVM bug. 1010ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::poisonStackInFunction(Function &F) { 1011800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClStack) return false; 1012800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<AllocaInst*, 16> AllocaVec; 1013800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 8> RetVec; 1014800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t TotalSize = 0; 1015800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1016800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Filter out Alloca instructions we want (and can) handle. 1017800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Collect Ret instructions. 1018800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 1019800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 1020800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasicBlock &BB = *FI; 1021800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = BB.begin(), BE = BB.end(); 1022800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 1023800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (isa<ReturnInst>(BI)) { 1024800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany RetVec.push_back(BI); 1025800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 1026800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1027800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1028800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = dyn_cast<AllocaInst>(BI); 1029800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI) continue; 1030800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->isArrayAllocation()) continue; 1031800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->isStaticAlloca()) continue; 1032800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!AI->getAllocatedType()->isSized()) continue; 1033800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AI->getAlignment() > RedzoneSize) continue; 1034800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaVec.push_back(AI); 1035800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1036800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TotalSize += AlignedSize; 1037800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1038800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1039800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1040800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (AllocaVec.empty()) return false; 1041800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1042800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t LocalStackSize = TotalSize + (AllocaVec.size() + 1) * RedzoneSize; 1043800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1044800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany bool DoStackMalloc = ClUseAfterReturn 1045800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany && LocalStackSize <= kMaxStackMallocSize; 1046800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1047800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsBefore = AllocaVec[0]; 1048800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsBefore); 1049800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1050800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1051800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize); 1052800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *MyAlloca = 1053800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore); 1054800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MyAlloca->setAlignment(RedzoneSize); 1055800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(MyAlloca->isStaticAlloca()); 1056800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy); 1057800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LocalStackBase = OrigStackBase; 1058800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1059800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1060800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc, 1061800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase); 1062800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1063800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1064800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // This string will be parsed by the run-time (DescribeStackAddress). 1065800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallString<2048> StackDescriptionStorage; 1066800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany raw_svector_ostream StackDescription(StackDescriptionStorage); 1067800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << F.getName() << " " << AllocaVec.size() << " "; 1068800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1069800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t Pos = RedzoneSize; 1070800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Replace Alloca instructions with base+offset. 1071800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 1072800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 1073800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 1074800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Name = AI->getName(); 1075800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << Pos << " " << SizeInBytes << " " 1076800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany << Name.size() << " " << Name << " "; 1077800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1078800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert((AlignedSize % RedzoneSize) == 0); 1079800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->replaceAllUsesWith( 1080800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr( 1081800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)), 1082800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AI->getType())); 1083800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize + RedzoneSize; 1084800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1085800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(Pos == LocalStackSize); 1086800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1087800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Write the Magic value and the frame description constant to the redzone. 1088800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus0 = IRB.CreateIntToPtr(LocalStackBase, IntptrPtrTy); 1089800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(ConstantInt::get(IntptrTy, kCurrentStackFrameMagic), 1090800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1091800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus1 = IRB.CreateAdd(LocalStackBase, 1092800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LongSize/8)); 1093800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy); 10949ce84c1c95c0153a2f33e188ce0db00770425f9eAlexey Samsonov GlobalVariable *StackDescriptionGlobal = 1095a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany createPrivateGlobalForString(*F.getParent(), StackDescription.str()); 1096a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany GlobalsCreatedByAsan.insert(StackDescriptionGlobal); 1097a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany Value *Description = IRB.CreatePointerCast(StackDescriptionGlobal, IntptrTy); 1098800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Description, BasePlus1); 1099800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1100800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the stack redzones at the entry. 1101800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowBase = memToShadow(LocalStackBase, IRB); 1102800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRB, ShadowBase, true); 1103800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1104800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack before all ret instructions. 1105800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = RetVec.size(); i < n; i++) { 1106800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Ret = RetVec[i]; 1107800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRBRet(Ret); 1108800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Mark the current frame as retired. 1110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateStore(ConstantInt::get(IntptrTy, kRetiredStackFrameMagic), 1111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack. 1113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRBRet, ShadowBase, false); 1114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateCall3(AsanStackFreeFunc, LocalStackBase, 1117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), 1118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OrigStackBase); 1119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1122bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany // We are done. Remove the old unused alloca instructions. 1123bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) 1124bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany AllocaVec[i]->eraseFromParent(); 1125bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany 1126800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugStack) { 1127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << F); 1128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 1131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1132