AddressSanitizer.cpp revision 29f975f8ffda1f5d78cbf2530c2316abef11aa70
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 18d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Transforms/Instrumentation.h" 19800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/ArrayRef.h" 201c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov#include "llvm/ADT/DenseMap.h" 2159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov#include "llvm/ADT/DepthFirstIterator.h" 22800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/OwningPtr.h" 23800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallSet.h" 24800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallString.h" 25800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/SmallVector.h" 26800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/ADT/StringExtras.h" 2706fdbaa9145f01a291d4981ca5120b7bdcad44c6Evgeniy Stepanov#include "llvm/ADT/Triple.h" 281afbb517965e29b07cb42e2335d5eadd87de6535Alexey Samsonov#include "llvm/DIBuilder.h" 290b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/DataLayout.h" 300b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Function.h" 310b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/IRBuilder.h" 320b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/InlineAsm.h" 330b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/IntrinsicInst.h" 340b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/LLVMContext.h" 350b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Module.h" 360b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Type.h" 3759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov#include "llvm/InstVisitor.h" 38800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/CommandLine.h" 39800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/DataTypes.h" 40800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/Debug.h" 41800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/raw_ostream.h" 42800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Support/system_error.h" 43800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Target/TargetMachine.h" 44800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/BasicBlockUtils.h" 4590230c84668269fbd53d163e398cd16486d5d414Chandler Carruth#include "llvm/Transforms/Utils/BlackList.h" 461afbb517965e29b07cb42e2335d5eadd87de6535Alexey Samsonov#include "llvm/Transforms/Utils/Local.h" 47800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include "llvm/Transforms/Utils/ModuleUtils.h" 48800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany#include <algorithm> 49d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include <string> 50800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 51800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanyusing namespace llvm; 52800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 53800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowScale = 3; 54800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset32 = 1ULL << 29; 55800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uint64_t kDefaultShadowOffset64 = 1ULL << 44; 5648a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryanystatic const uint64_t kPPC64_ShadowOffset64 = 1ULL << 41; 57800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 58800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const size_t kMaxStackMallocSize = 1 << 16; // 64K 59800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3; 60800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const uintptr_t kRetiredStackFrameMagic = 0x45E0360E; 61800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 62800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanModuleCtorName = "asan.module_ctor"; 637bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanModuleDtorName = "asan.module_dtor"; 647bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const int kAsanCtorAndCtorPriority = 1; 65800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanReportErrorTemplate = "__asan_report_"; 66800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanRegisterGlobalsName = "__asan_register_globals"; 677bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryanystatic const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals"; 689b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic const char *kAsanPoisonGlobalsName = "__asan_before_dynamic_init"; 699b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic const char *kAsanUnpoisonGlobalsName = "__asan_after_dynamic_init"; 70800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanInitName = "__asan_init"; 7195e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryanystatic const char *kAsanHandleNoReturnName = "__asan_handle_no_return"; 72800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingOffsetName = "__asan_mapping_offset"; 73800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanMappingScaleName = "__asan_mapping_scale"; 74800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackMallocName = "__asan_stack_malloc"; 75800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const char *kAsanStackFreeName = "__asan_stack_free"; 7651c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryanystatic const char *kAsanGenPrefix = "__asan_gen_"; 77f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonovstatic const char *kAsanPoisonStackMemoryName = "__asan_poison_stack_memory"; 78f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonovstatic const char *kAsanUnpoisonStackMemoryName = 79f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov "__asan_unpoison_stack_memory"; 80800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 81800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackLeftRedzoneMagic = 0xf1; 82800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackMidRedzoneMagic = 0xf2; 83800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackRightRedzoneMagic = 0xf3; 84800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic const int kAsanStackPartialRedzoneMagic = 0xf4; 85800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 86c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany// Accesses sizes are powers of two: 1, 2, 4, 8, 16. 87c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanystatic const size_t kNumberOfAccessSizes = 5; 88c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 89800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Command-line flags. 90800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 91800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no-]asan-reads. 92800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentReads("asan-instrument-reads", 93800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument read instructions"), cl::Hidden, cl::init(true)); 94800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClInstrumentWrites("asan-instrument-writes", 95800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("instrument write instructions"), cl::Hidden, cl::init(true)); 96e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic cl::opt<bool> ClInstrumentAtomics("asan-instrument-atomics", 97e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::desc("instrument atomic instructions (rmw, cmpxchg)"), 98e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany cl::Hidden, cl::init(true)); 996e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryanystatic cl::opt<bool> ClAlwaysSlowPath("asan-always-slow-path", 1006e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany cl::desc("use instrumentation with slow path for all accesses"), 1016e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany cl::Hidden, cl::init(false)); 102c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany// This flag limits the number of instructions to be instrumented 103324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// in any given BB. Normally, this should be set to unlimited (INT_MAX), 104324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// but due to http://llvm.org/bugs/show_bug.cgi?id=12652 we temporary 105324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany// set it to 10000. 106324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryanystatic cl::opt<int> ClMaxInsnsToInstrumentPerBB("asan-max-ins-per-bb", 107324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::init(10000), 108324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::desc("maximal number of instructions to instrument in any given BB"), 109324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany cl::Hidden); 110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-stack. 111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClStack("asan-stack", 112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle stack memory"), cl::Hidden, cl::init(true)); 113800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-use-after-return. 114800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClUseAfterReturn("asan-use-after-return", 115800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Check return-after-free"), cl::Hidden, cl::init(false)); 116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This flag may need to be replaced with -f[no]asan-globals. 117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClGlobals("asan-globals", 118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle global objects"), cl::Hidden, cl::init(true)); 1199b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryanystatic cl::opt<bool> ClInitializers("asan-initialization-order", 1209b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany cl::desc("Handle C++ initializer order"), cl::Hidden, cl::init(false)); 121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClMemIntrin("asan-memintrin", 122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Handle memset/memcpy/memmove"), cl::Hidden, cl::init(true)); 1236c55412ea4b39103a3a5764d49ddfdf50e066d56Kostya Serebryanystatic cl::opt<bool> ClRealignStack("asan-realign-stack", 1246c55412ea4b39103a3a5764d49ddfdf50e066d56Kostya Serebryany cl::desc("Realign stack to 32"), cl::Hidden, cl::init(true)); 125b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonovstatic cl::opt<std::string> ClBlacklistFile("asan-blacklist", 126b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov cl::desc("File containing the list of objects to ignore " 127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "during instrumentation"), cl::Hidden); 128800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// These flags allow to change the shadow mapping. 130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// The shadow mapping looks like 131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Shadow = (Mem >> scale) + (1 << offset_log) 132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingScale("asan-mapping-scale", 133800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("scale of asan shadow mapping"), cl::Hidden, cl::init(0)); 134800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClMappingOffsetLog("asan-mapping-offset-log", 135800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("offset of asan shadow mapping"), cl::Hidden, cl::init(-1)); 136800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 137800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Optimization flags. Not user visible, used mostly for testing 138800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// and benchmarking the tool. 139800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOpt("asan-opt", 140800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Optimize instrumentation"), cl::Hidden, cl::init(true)); 141800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptSameTemp("asan-opt-same-temp", 142800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Instrument the same temp just once"), cl::Hidden, 143800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(true)); 144800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<bool> ClOptGlobals("asan-opt-globals", 145800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::desc("Don't instrument scalar globals"), cl::Hidden, cl::init(true)); 146800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 147ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonovstatic cl::opt<bool> ClCheckLifetime("asan-check-lifetime", 148ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov cl::desc("Use llvm.lifetime intrinsics to insert extra checks"), 149ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov cl::Hidden, cl::init(false)); 150ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov 151800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Debug flags. 152800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebug("asan-debug", cl::desc("debug"), cl::Hidden, 153800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::init(0)); 154800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugStack("asan-debug-stack", cl::desc("debug stack"), 155800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(0)); 156800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<std::string> ClDebugFunc("asan-debug-func", 157800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::desc("Debug func")); 158800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMin("asan-debug-min", cl::desc("Debug min inst"), 159800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 160800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic cl::opt<int> ClDebugMax("asan-debug-max", cl::desc("Debug man inst"), 161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany cl::Hidden, cl::init(-1)); 162800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 163800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanynamespace { 164ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany/// A set of dynamically initialized globals extracted from metadata. 165ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryanyclass SetOfDynamicallyInitializedGlobals { 166ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany public: 167ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany void Init(Module& M) { 168ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // Clang generates metadata identifying all dynamically initialized globals. 169ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany NamedMDNode *DynamicGlobals = 170ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany M.getNamedMetadata("llvm.asan.dynamically_initialized_globals"); 171ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany if (!DynamicGlobals) 172ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany return; 173ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany for (int i = 0, n = DynamicGlobals->getNumOperands(); i < n; ++i) { 174ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany MDNode *MDN = DynamicGlobals->getOperand(i); 175ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany assert(MDN->getNumOperands() == 1); 176ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany Value *VG = MDN->getOperand(0); 177ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // The optimizer may optimize away a global entirely, in which case we 178ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany // cannot instrument access to it. 179ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany if (!VG) 180ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany continue; 181ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany DynInitGlobals.insert(cast<GlobalVariable>(VG)); 182ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany } 183ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany } 184ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany bool Contains(GlobalVariable *G) { return DynInitGlobals.count(G) != 0; } 185ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany private: 186ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany SmallSet<GlobalValue*, 32> DynInitGlobals; 187ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany}; 188ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany 18919cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov/// This struct defines the shadow mapping using the rule: 19048a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany/// shadow = (mem >> Scale) ADD-or-OR Offset. 19119cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonovstruct ShadowMapping { 19219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov int Scale; 19319cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov uint64_t Offset; 19448a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany bool OrShadowOffset; 19519cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov}; 19619cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov 19711af9a873f9e1409a422ab31e22729368805afafAlexey Samsonovstatic ShadowMapping getShadowMapping(const Module &M, int LongSize, 19811af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov bool ZeroBaseShadow) { 19911af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov llvm::Triple TargetTriple(M.getTargetTriple()); 20011af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov bool IsAndroid = TargetTriple.getEnvironment() == llvm::Triple::Android; 20148a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany bool IsPPC64 = TargetTriple.getArch() == llvm::Triple::ppc64; 20219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov 20319cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov ShadowMapping Mapping; 20419cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov 20548a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany // OR-ing shadow offset if more efficient (at least on x86), 20648a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany // but on ppc64 we have to use add since the shadow offset is not neccesary 20748a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany // 1/8-th of the address space. 20848a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany Mapping.OrShadowOffset = !IsPPC64; 20948a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany 21011af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov Mapping.Offset = (IsAndroid || ZeroBaseShadow) ? 0 : 21148a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany (LongSize == 32 ? kDefaultShadowOffset32 : 21248a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany IsPPC64 ? kPPC64_ShadowOffset64 : kDefaultShadowOffset64); 21319cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov if (ClMappingOffsetLog >= 0) { 21419cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov // Zero offset log is the special case. 21519cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov Mapping.Offset = (ClMappingOffsetLog == 0) ? 0 : 1ULL << ClMappingOffsetLog; 21619cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov } 21719cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov 21819cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov Mapping.Scale = kDefaultShadowScale; 21919cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov if (ClMappingScale) { 22019cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov Mapping.Scale = ClMappingScale; 22119cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov } 22219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov 22319cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov return Mapping; 224b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany} 225b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 22619cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonovstatic size_t RedzoneSizeForScale(int MappingScale) { 227b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany // Redzone used for stack and globals is at least 32 bytes. 228b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany // For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively. 22919cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov return std::max(32U, 1U << MappingScale); 230b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany} 231ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany 232800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany/// AddressSanitizer: instrument the code in module to find memory bugs. 233ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanystruct AddressSanitizer : public FunctionPass { 234ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov AddressSanitizer(bool CheckInitOrder = false, 235ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckUseAfterReturn = false, 236b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov bool CheckLifetime = false, 23711af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov StringRef BlacklistFile = StringRef(), 23811af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov bool ZeroBaseShadow = false) 239ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov : FunctionPass(ID), 240ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov CheckInitOrder(CheckInitOrder || ClInitializers), 241ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov CheckUseAfterReturn(CheckUseAfterReturn || ClUseAfterReturn), 242b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov CheckLifetime(CheckLifetime || ClCheckLifetime), 243b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov BlacklistFile(BlacklistFile.empty() ? ClBlacklistFile 24411af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov : BlacklistFile), 24511af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov ZeroBaseShadow(ZeroBaseShadow) {} 2461416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany virtual const char *getPassName() const { 2471416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany return "AddressSanitizerFunctionPass"; 2481416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany } 249ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentMop(Instruction *I); 250ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentAddress(Instruction *OrigIns, IRBuilder<> &IRB, 251800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, uint32_t TypeSize, bool IsWrite); 252c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 253c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, uint32_t TypeSize); 254ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *generateCrashCode(Instruction *InsertBefore, Value *Addr, 2552735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany bool IsWrite, size_t AccessSizeIndex); 256ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool instrumentMemIntrinsic(MemIntrinsic *MI); 257ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany void instrumentMemIntrinsicParam(Instruction *OrigIns, Value *Addr, 258c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Size, 259800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore, bool IsWrite); 260800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *memToShadow(Value *Shadow, IRBuilder<> &IRB); 261ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany bool runOnFunction(Function &F); 2629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void createInitializerPoisonCalls(Module &M, 2639b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstAddr, Value *LastAddr); 264a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany bool maybeInsertAsanInitAtFunctionEntry(Function &F); 26519cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov void emitShadowMapping(Module &M, IRBuilder<> &IRB) const; 266ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany virtual bool doInitialization(Module &M); 267800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany static char ID; // Pass identification, replacement for typeid 268800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 269800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany private: 2708b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany void initializeCallbacks(Module &M); 271800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 2729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany bool ShouldInstrumentGlobal(GlobalVariable *G); 2735a3a9c937198084498a196dae856ac5a5a005bccKostya Serebryany bool LooksLikeCodeInBug11395(Instruction *I); 2749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany void FindDynamicInitializers(Module &M); 275800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 276ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckInitOrder; 277ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckUseAfterReturn; 278ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckLifetime; 27911af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov SmallString<64> BlacklistFile; 28011af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov bool ZeroBaseShadow; 28111af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov 282800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LLVMContext *C; 2833574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow DataLayout *TD; 284800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int LongSize; 285800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *IntptrTy; 28619cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov ShadowMapping Mapping; 287800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanCtorFunction; 288800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Function *AsanInitFunction; 289ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Function *AsanHandleNoReturnFunc; 290b5b86d263a651566cb25c0f406f75ceffb771029Kostya Serebryany OwningPtr<BlackList> BL; 2919db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // This array is indexed by AccessIsWrite and log2(AccessSize). 2929db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany Function *AsanErrorCallback[2][kNumberOfAccessSizes]; 293f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany InlineAsm *EmptyAsm; 294ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals; 29559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 29659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov friend struct FunctionStackPoisoner; 297800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany}; 298c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 2991416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanyclass AddressSanitizerModule : public ModulePass { 300b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany public: 301b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov AddressSanitizerModule(bool CheckInitOrder = false, 30211af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov StringRef BlacklistFile = StringRef(), 30311af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov bool ZeroBaseShadow = false) 304ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov : ModulePass(ID), 305b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov CheckInitOrder(CheckInitOrder || ClInitializers), 306b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov BlacklistFile(BlacklistFile.empty() ? ClBlacklistFile 30711af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov : BlacklistFile), 30811af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov ZeroBaseShadow(ZeroBaseShadow) {} 3091416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany bool runOnModule(Module &M); 3101416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany static char ID; // Pass identification, replacement for typeid 3111416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany virtual const char *getPassName() const { 3121416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany return "AddressSanitizerModule"; 3131416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany } 314f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov 315b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany private: 3164684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov void initializeCallbacks(Module &M); 3174684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov 318b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany bool ShouldInstrumentGlobal(GlobalVariable *G); 319b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany void createInitializerPoisonCalls(Module &M, Value *FirstAddr, 320b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Value *LastAddr); 32119cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov size_t RedzoneSize() const { 32219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov return RedzoneSizeForScale(Mapping.Scale); 32319cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov } 324b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 325ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov bool CheckInitOrder; 326b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov SmallString<64> BlacklistFile; 32711af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov bool ZeroBaseShadow; 32811af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov 329b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany OwningPtr<BlackList> BL; 330b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals; 331b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Type *IntptrTy; 332b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany LLVMContext *C; 3331416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany DataLayout *TD; 33419cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov ShadowMapping Mapping; 3354684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov Function *AsanPoisonGlobals; 3364684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov Function *AsanUnpoisonGlobals; 3374684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov Function *AsanRegisterGlobals; 3384684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov Function *AsanUnregisterGlobals; 339b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany}; 340b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 34159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// Stack poisoning does not play well with exception handling. 34259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// When an exception is thrown, we essentially bypass the code 34359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// that unpoisones the stack. This is why the run-time library has 34459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// to intercept __cxa_throw (as well as longjmp, etc) and unpoison the entire 34559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// stack in the interceptor. This however does not work inside the 34659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// actual function which catches the exception. Most likely because the 34759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// compiler hoists the load of the shadow value somewhere too high. 34859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// This causes asan to report a non-existing bug on 453.povray. 34959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// It sounds like an LLVM bug. 35059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovstruct FunctionStackPoisoner : public InstVisitor<FunctionStackPoisoner> { 35159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Function &F; 35259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AddressSanitizer &ASan; 35359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov DIBuilder DIB; 35459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov LLVMContext *C; 35559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Type *IntptrTy; 35659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Type *IntptrPtrTy; 35719cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov ShadowMapping Mapping; 35859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 35959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov SmallVector<AllocaInst*, 16> AllocaVec; 36059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov SmallVector<Instruction*, 8> RetVec; 36159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t TotalStackSize; 36259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov unsigned StackAlignment; 36359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 36459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Function *AsanStackMallocFunc, *AsanStackFreeFunc; 36559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Function *AsanPoisonStackMemoryFunc, *AsanUnpoisonStackMemoryFunc; 36659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 3671c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Stores a place and arguments of poisoning/unpoisoning call for alloca. 3681c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov struct AllocaPoisonCall { 3691c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov IntrinsicInst *InsBefore; 3701c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov uint64_t Size; 3711c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov bool DoPoison; 3721c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov }; 3731c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov SmallVector<AllocaPoisonCall, 8> AllocaPoisonCallVec; 3741c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov 3751c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Maps Value to an AllocaInst from which the Value is originated. 3761c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov typedef DenseMap<Value*, AllocaInst*> AllocaForValueMapTy; 3771c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaForValueMapTy AllocaForValue; 3781c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov 37959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov FunctionStackPoisoner(Function &F, AddressSanitizer &ASan) 38059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov : F(F), ASan(ASan), DIB(*F.getParent()), C(ASan.C), 38159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IntptrTy(ASan.IntptrTy), IntptrPtrTy(PointerType::get(IntptrTy, 0)), 38219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov Mapping(ASan.Mapping), 38319cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov TotalStackSize(0), StackAlignment(1 << Mapping.Scale) {} 38459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 38559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool runOnFunction() { 38659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (!ClStack) return false; 38759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Collect alloca, ret, lifetime instructions etc. 38859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov for (df_iterator<BasicBlock*> DI = df_begin(&F.getEntryBlock()), 38959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov DE = df_end(&F.getEntryBlock()); DI != DE; ++DI) { 39059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov BasicBlock *BB = *DI; 39159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov visit(*BB); 39259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 39359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (AllocaVec.empty()) return false; 39459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 39559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov initializeCallbacks(*F.getParent()); 39659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 39759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov poisonStack(); 39859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 39959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (ClDebugStack) { 40059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov DEBUG(dbgs() << F); 40159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 40259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return true; 40359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 40459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 40559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Finds all static Alloca instructions and puts 40659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // poisoned red zones around all of them. 40759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // Then unpoison everything back before the function returns. 40859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void poisonStack(); 40959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 41059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // ----------------------- Visitors. 41159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// \brief Collect all Ret instructions. 41259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void visitReturnInst(ReturnInst &RI) { 41359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov RetVec.push_back(&RI); 41459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 41559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 41659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov /// \brief Collect Alloca instructions we want (and can) handle. 41759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void visitAllocaInst(AllocaInst &AI) { 4181c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (!isInterestingAlloca(AI)) return; 41959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 42059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov StackAlignment = std::max(StackAlignment, AI.getAlignment()); 42159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AllocaVec.push_back(&AI); 42259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t AlignedSize = getAlignedAllocaSize(&AI); 42359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov TotalStackSize += AlignedSize; 42459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 42559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 4261c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov /// \brief Collect lifetime intrinsic calls to check for use-after-scope 4271c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov /// errors. 4281c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov void visitIntrinsicInst(IntrinsicInst &II) { 4291c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (!ASan.CheckLifetime) return; 4301c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov Intrinsic::ID ID = II.getIntrinsicID(); 4311c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (ID != Intrinsic::lifetime_start && 4321c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov ID != Intrinsic::lifetime_end) 4331c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov return; 4341c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Found lifetime intrinsic, add ASan instrumentation if necessary. 4351c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov ConstantInt *Size = dyn_cast<ConstantInt>(II.getArgOperand(0)); 4361c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // If size argument is undefined, don't do anything. 4371c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (Size->isMinusOne()) return; 4381c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Check that size doesn't saturate uint64_t and can 4391c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // be stored in IntptrTy. 4401c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov const uint64_t SizeValue = Size->getValue().getLimitedValue(); 4411c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (SizeValue == ~0ULL || 4421c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov !ConstantInt::isValueValidForType(IntptrTy, SizeValue)) 4431c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov return; 4441c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Find alloca instruction that corresponds to llvm.lifetime argument. 4451c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaInst *AI = findAllocaForValue(II.getArgOperand(1)); 4461c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (!AI) return; 4471c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov bool DoPoison = (ID == Intrinsic::lifetime_end); 4481c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaPoisonCall APC = {&II, SizeValue, DoPoison}; 4491c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaPoisonCallVec.push_back(APC); 4501c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov } 4511c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov 45259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // ---------------------- Helpers. 45359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void initializeCallbacks(Module &M); 45459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 4551c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Check if we want (and can) handle this alloca. 4561c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov bool isInterestingAlloca(AllocaInst &AI) { 4571c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov return (!AI.isArrayAllocation() && 4581c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AI.isStaticAlloca() && 4591c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AI.getAllocatedType()->isSized()); 4601c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov } 4611c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov 46219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov size_t RedzoneSize() const { 46319cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov return RedzoneSizeForScale(Mapping.Scale); 46419cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov } 46559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t getAllocaSizeInBytes(AllocaInst *AI) { 46659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Type *Ty = AI->getAllocatedType(); 46759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t SizeInBytes = ASan.TD->getTypeAllocSize(Ty); 46859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return SizeInBytes; 46959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 47059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t getAlignedSize(uint64_t SizeInBytes) { 47159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov size_t RZ = RedzoneSize(); 47259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return ((SizeInBytes + RZ - 1) / RZ) * RZ; 47359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 47459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t getAlignedAllocaSize(AllocaInst *AI) { 47559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 47659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return getAlignedSize(SizeInBytes); 47759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 4781c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov /// Finds alloca where the value comes from. 4791c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaInst *findAllocaForValue(Value *V); 48059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void poisonRedZones(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, 48159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Value *ShadowBase, bool DoPoison); 48259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov void poisonAlloca(Value *V, uint64_t Size, IRBuilder<> IRB, bool DoPoison); 48359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov}; 48459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 485800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} // namespace 486800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 487800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanychar AddressSanitizer::ID = 0; 488800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyINITIALIZE_PASS(AddressSanitizer, "asan", 489800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs.", 490800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany false, false) 491ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey SamsonovFunctionPass *llvm::createAddressSanitizerFunctionPass( 492b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov bool CheckInitOrder, bool CheckUseAfterReturn, bool CheckLifetime, 49311af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov StringRef BlacklistFile, bool ZeroBaseShadow) { 494ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov return new AddressSanitizer(CheckInitOrder, CheckUseAfterReturn, 49511af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov CheckLifetime, BlacklistFile, ZeroBaseShadow); 496800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 497800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 4981416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanychar AddressSanitizerModule::ID = 0; 4991416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya SerebryanyINITIALIZE_PASS(AddressSanitizerModule, "asan-module", 5001416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany "AddressSanitizer: detects use-after-free and out-of-bounds bugs." 5011416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany "ModulePass", false, false) 502b0dcf61252e58715a3bea79f4c112572df361c30Alexey SamsonovModulePass *llvm::createAddressSanitizerModulePass( 50311af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov bool CheckInitOrder, StringRef BlacklistFile, bool ZeroBaseShadow) { 50411af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov return new AddressSanitizerModule(CheckInitOrder, BlacklistFile, 50511af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov ZeroBaseShadow); 50625878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko} 50725878042030e85c244b41bfcdfad27c32360e2ecAlexander Potapenko 5082735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryanystatic size_t TypeSizeToSizeIndex(uint32_t TypeSize) { 5092735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany size_t Res = CountTrailingZeros_32(TypeSize / 8); 5102735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany assert(Res < kNumberOfAccessSizes); 5112735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany return Res; 5122735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany} 5132735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany 514800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Create a constant for Str so that we can pass it to the run-time lib. 515800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) { 51618c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str); 517800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return new GlobalVariable(M, StrConst->getType(), true, 51851c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany GlobalValue::PrivateLinkage, StrConst, 51951c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany kAsanGenPrefix); 52051c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany} 52151c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany 52251c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryanystatic bool GlobalWasGeneratedByAsan(GlobalVariable *G) { 52351c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany return G->getName().find(kAsanGenPrefix) == 0; 524800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 525800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 526800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyValue *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) { 527800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Shadow >> scale 52819cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov Shadow = IRB.CreateLShr(Shadow, Mapping.Scale); 52919cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov if (Mapping.Offset == 0) 530800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return Shadow; 531800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // (Shadow >> scale) | offset 53248a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany if (Mapping.OrShadowOffset) 53348a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany return IRB.CreateOr(Shadow, ConstantInt::get(IntptrTy, Mapping.Offset)); 53448a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany else 53548a615fee78c3c262c60147a65dc6fff5fd6bb3bKostya Serebryany return IRB.CreateAdd(Shadow, ConstantInt::get(IntptrTy, Mapping.Offset)); 536800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 537800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 538c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryanyvoid AddressSanitizer::instrumentMemIntrinsicParam( 539ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany Instruction *OrigIns, 540800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) { 541800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the first byte. 542800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 543800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 544ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(OrigIns, IRB, Addr, 8, IsWrite); 545800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 546800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Check the last byte. 547800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany { 548800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 549800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *SizeMinusOne = IRB.CreateSub( 550800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Size, ConstantInt::get(Size->getType(), 1)); 551800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SizeMinusOne = IRB.CreateIntCast(SizeMinusOne, IntptrTy, false); 552800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 553800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrPlusSizeMinisOne = IRB.CreateAdd(AddrLong, SizeMinusOne); 554ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(OrigIns, IRB, AddrPlusSizeMinisOne, 8, IsWrite); 555800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 556800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 557800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 558800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// Instrument memset/memmove/memcpy 559ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::instrumentMemIntrinsic(MemIntrinsic *MI) { 560800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Dst = MI->getDest(); 561800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI); 5622735cf4aa52e31b8d2de90f836c3ad991215e04eKostya Serebryany Value *Src = MemTran ? MemTran->getSource() : 0; 563800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Length = MI->getLength(); 564800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 565800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *ConstLength = dyn_cast<Constant>(Length); 566800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsertBefore = MI; 567800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength) { 568800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ConstLength->isNullValue()) return false; 569800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 570800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // The size is not a constant so it could be zero -- check at run-time. 571800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsertBefore); 572800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 573800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(Length, 57456139bc493790612ee6281630678e293be6b2eb2Kostya Serebryany Constant::getNullValue(Length->getType())); 5754a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov InsertBefore = SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false); 576800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 577800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 578ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsicParam(MI, Dst, Length, InsertBefore, true); 579800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (Src) 580ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsicParam(MI, Src, Length, InsertBefore, false); 581800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 582800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 583800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 584e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// If I is an interesting memory access, return the PointerOperand 585e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany// and set IsWrite. Otherwise return NULL. 586e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryanystatic Value *isInterestingMemoryAccess(Instruction *I, bool *IsWrite) { 587800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 588e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentReads) return NULL; 589e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = false; 590800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return LI->getPointerOperand(); 591800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 592e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (StoreInst *SI = dyn_cast<StoreInst>(I)) { 593e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentWrites) return NULL; 594e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 595e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return SI->getPointerOperand(); 596e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 597e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(I)) { 598e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 599e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 600e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return RMW->getPointerOperand(); 601e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 602e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (AtomicCmpXchgInst *XCHG = dyn_cast<AtomicCmpXchgInst>(I)) { 603e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (!ClInstrumentAtomics) return NULL; 604e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany *IsWrite = true; 605e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return XCHG->getPointerOperand(); 606e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany } 607e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany return NULL; 608800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 609800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 610ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanyvoid AddressSanitizer::instrumentMop(Instruction *I) { 6113780ad8b998d93d7db406919c06137cdb786ef05Axel Naumann bool IsWrite = false; 612e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany Value *Addr = isInterestingMemoryAccess(I, &IsWrite); 613e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany assert(Addr); 6149b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ClOpt && ClOptGlobals) { 6159b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (GlobalVariable *G = dyn_cast<GlobalVariable>(Addr)) { 6169b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If initialization order checking is disabled, a simple access to a 6179b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // dynamically initialized global is always valid. 618ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov if (!CheckInitOrder) 6199b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 6209b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If a global variable does not have dynamic initialization we don't 621407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany // have to instrument it. However, if a global does not have initailizer 622407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany // at all, we assume it has dynamic initializer (in other TU). 623407790604b8f71f7172bbdfb76c27e1799d241c2Kostya Serebryany if (G->hasInitializer() && !DynamicallyInitializedGlobals.Contains(G)) 6249b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 6259b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 626800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 6279b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 628800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigPtrTy = Addr->getType(); 629800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 630800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 631800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(OrigTy->isSized()); 632800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 633800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 634800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (TypeSize != 8 && TypeSize != 16 && 635800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 636800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Ignore all unusual sizes. 637800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return; 638800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 639800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 640800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(I); 641ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentAddress(I, IRB, Addr, TypeSize, IsWrite); 642800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 643800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 64455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// Validate the result of Module::getOrInsertFunction called for an interface 64555cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// function of AddressSanitizer. If the instrumented module defines a function 64655cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// with the same name, their prototypes must match, otherwise 64755cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko// getOrInsertFunction returns a bitcast. 648b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryanystatic Function *checkInterfaceFunction(Constant *FuncOrBitcast) { 64955cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast); 65055cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko FuncOrBitcast->dump(); 65155cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko report_fatal_error("trying to redefine an AddressSanitizer " 65255cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko "interface function"); 65355cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko} 65455cabae685991ac6bc6d96b14e2139f64a0c9967Alexander Potapenko 655800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya SerebryanyInstruction *AddressSanitizer::generateCrashCode( 656ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *InsertBefore, Value *Addr, 6574f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany bool IsWrite, size_t AccessSizeIndex) { 658ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany IRBuilder<> IRB(InsertBefore); 659ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CallInst *Call = IRB.CreateCall(AsanErrorCallback[IsWrite][AccessSizeIndex], 660ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Addr); 661f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We don't do Call->setDoesNotReturn() because the BB already has 662f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // UnreachableInst at the end. 663f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // This EmptyAsm is required to avoid callback merge. 664f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany IRB.CreateCall(EmptyAsm); 6653c7faae346f548c55cad86d82a2e242443001f23Kostya Serebryany return Call; 666800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 667800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 6682735cf4aa52e31b8d2de90f836c3ad991215e04eKostya SerebryanyValue *AddressSanitizer::createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong, 669c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *ShadowValue, 670c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany uint32_t TypeSize) { 67119cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov size_t Granularity = 1 << Mapping.Scale; 672c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // Addr & (Granularity - 1) 673c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *LastAccessedByte = IRB.CreateAnd( 674c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany AddrLong, ConstantInt::get(IntptrTy, Granularity - 1)); 675c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (Addr & (Granularity - 1)) + size - 1 676c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany if (TypeSize / 8 > 1) 677c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateAdd( 678c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1)); 679c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // (uint8_t) ((Addr & (Granularity-1)) + size - 1) 680c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany LastAccessedByte = IRB.CreateIntCast( 6816e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany LastAccessedByte, ShadowValue->getType(), false); 682c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue 683c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany return IRB.CreateICmpSGE(LastAccessedByte, ShadowValue); 684c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany} 685c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany 686ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanyvoid AddressSanitizer::instrumentAddress(Instruction *OrigIns, 687800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> &IRB, Value *Addr, 688800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t TypeSize, bool IsWrite) { 689800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *AddrLong = IRB.CreatePointerCast(Addr, IntptrTy); 690800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 691800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowTy = IntegerType::get( 69219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov *C, std::max(8U, TypeSize >> Mapping.Scale)); 693800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ShadowPtrTy = PointerType::get(ShadowTy, 0); 694800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowPtr = memToShadow(AddrLong, IRB); 695800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *CmpVal = Constant::getNullValue(ShadowTy); 696800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *ShadowValue = IRB.CreateLoad( 697800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy)); 698800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 699800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal); 70011c2a47af825a0f89d75aaa97ad873ed2acef266Kostya Serebryany size_t AccessSizeIndex = TypeSizeToSizeIndex(TypeSize); 70119cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov size_t Granularity = 1 << Mapping.Scale; 702ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany TerminatorInst *CrashTerm = 0; 703ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 7046e2d506dc962873a0e05092bbb034f9a615d1084Kostya Serebryany if (ClAlwaysSlowPath || (TypeSize < 8 * Granularity)) { 7054a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov TerminatorInst *CheckTerm = 7064a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false); 707ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany assert(dyn_cast<BranchInst>(CheckTerm)->isUnconditional()); 708f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BasicBlock *NextBB = CheckTerm->getSuccessor(0); 709c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany IRB.SetInsertPoint(CheckTerm); 710c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany Value *Cmp2 = createSlowPathCmp(IRB, AddrLong, ShadowValue, TypeSize); 711ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany BasicBlock *CrashBlock = 712ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany BasicBlock::Create(*C, "", NextBB->getParent(), NextBB); 713ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany CrashTerm = new UnreachableInst(*C, CrashBlock); 714f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany BranchInst *NewTerm = BranchInst::Create(CrashBlock, NextBB, Cmp2); 715f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany ReplaceInstWithInst(CheckTerm, NewTerm); 716c0ed3e548c6f688e22685de04e210c7b59ac3433Kostya Serebryany } else { 7174a2dec05cef5882b745dd248d79e42a42cdbc87bEvgeniy Stepanov CrashTerm = SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), true); 718800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 719ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany 720ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Instruction *Crash = 721ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany generateCrashCode(CrashTerm, AddrLong, IsWrite, AccessSizeIndex); 722ebd6454929f2ba3b92f61c151eccde0b8b0a8dedKostya Serebryany Crash->setDebugLoc(OrigIns->getDebugLoc()); 723800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 724800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 7251416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanyvoid AddressSanitizerModule::createInitializerPoisonCalls( 726b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Module &M, Value *FirstAddr, Value *LastAddr) { 7279b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // We do all of our poisoning and unpoisoning within _GLOBAL__I_a. 7289b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Function *GlobalInit = M.getFunction("_GLOBAL__I_a"); 7299b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // If that function is not present, this TU contains no globals, or they have 7309b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // all been optimized away 7319b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!GlobalInit) 7329b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return; 7339b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 7349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Set up the arguments to our poison/unpoison functions. 7359b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRBuilder<> IRB(GlobalInit->begin()->getFirstInsertionPt()); 7369b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 7379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add a call to poison all external globals before the given function starts. 7389b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IRB.CreateCall2(AsanPoisonGlobals, FirstAddr, LastAddr); 7399b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 7409b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Add calls to unpoison all globals before each return instruction. 7419b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Function::iterator I = GlobalInit->begin(), E = GlobalInit->end(); 7429b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany I != E; ++I) { 7439b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ReturnInst *RI = dyn_cast<ReturnInst>(I->getTerminator())) { 7449b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany CallInst::Create(AsanUnpoisonGlobals, "", RI); 7459b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 7469b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 7479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 7489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 7491416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanybool AddressSanitizerModule::ShouldInstrumentGlobal(GlobalVariable *G) { 7509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Type *Ty = cast<PointerType>(G->getType())->getElementType(); 751324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "GLOBAL: " << *G << "\n"); 7529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 75359a4a47a7bea7cc17877c6a3954ad9f8309ff1cbKostya Serebryany if (BL->isIn(*G)) return false; 7549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!Ty->isSized()) return false; 7559b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (!G->hasInitializer()) return false; 75651c7c65e32f76ec5a50cdecfe2b4c287c57da127Kostya Serebryany if (GlobalWasGeneratedByAsan(G)) return false; // Our own global. 7579b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Touch only those globals that will not be defined in other modules. 7589b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Don't handle ODR type linkages since other modules may be built w/o asan. 7599b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->getLinkage() != GlobalVariable::ExternalLinkage && 7609b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::PrivateLinkage && 7619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany G->getLinkage() != GlobalVariable::InternalLinkage) 7629b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 7639b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Two problems with thread-locals: 7649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - The address of the main thread's copy can't be computed at link-time. 7659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // - Need to poison all copies, not just the main thread's one. 7669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->isThreadLocal()) 7679b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 7689b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // For now, just ignore this Alloca if the alignment is large. 769b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany if (G->getAlignment() > RedzoneSize()) return false; 7709b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 7719b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore all the globals with the names starting with "\01L_OBJC_". 7729b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Many of those are put into the .cstring section. The linker compresses 7739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // that section by removing the spare \0s after the string terminator, so 7749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // our redzones get broken. 7759b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((G->getName().find("\01L_OBJC_") == 0) || 7769b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (G->getName().find("\01l_OBJC_") == 0)) { 7779b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G); 7789b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 7799b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 7809b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 7819b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (G->hasSection()) { 7829b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany StringRef Section(G->getSection()); 7839b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Ignore the globals from the __OBJC section. The ObjC runtime assumes 7849b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to 7859b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // them. 7869b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if ((Section.find("__OBJC,") == 0) || 7879b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany (Section.find("__DATA, __objc_") == 0)) { 7889b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G); 7899b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 7909b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 7919b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // See http://code.google.com/p/address-sanitizer/issues/detail?id=32 7929b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Constant CFString instances are compiled in the following way: 7939b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the string buffer is emitted into 7949b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // __TEXT,__cstring,cstring_literals 7959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // -- the constant NSConstantString structure referencing that buffer 7969b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // is placed into __DATA,__cfstring 7979b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Therefore there's no point in placing redzones into __DATA,__cfstring. 7989b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Moreover, it causes the linker to crash on OS X 10.7 7999b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (Section.find("__DATA,__cfstring") == 0) { 8009b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany DEBUG(dbgs() << "Ignoring CFString: " << *G); 8019b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return false; 8029b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 8039b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 8049b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 8059b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany return true; 8069b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany} 8079b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 8084684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonovvoid AddressSanitizerModule::initializeCallbacks(Module &M) { 8094684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov IRBuilder<> IRB(*C); 8104684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov // Declare our poisoning and unpoisoning functions. 8114684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanPoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 8124684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov kAsanPoisonGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 8134684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanPoisonGlobals->setLinkage(Function::ExternalLinkage); 8144684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanUnpoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction( 8154684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov kAsanUnpoisonGlobalsName, IRB.getVoidTy(), NULL)); 8164684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanUnpoisonGlobals->setLinkage(Function::ExternalLinkage); 8174684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov // Declare functions that register/unregister globals. 8184684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanRegisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 8194684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov kAsanRegisterGlobalsName, IRB.getVoidTy(), 8204684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov IntptrTy, IntptrTy, NULL)); 8214684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanRegisterGlobals->setLinkage(Function::ExternalLinkage); 8224684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanUnregisterGlobals = checkInterfaceFunction(M.getOrInsertFunction( 8234684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov kAsanUnregisterGlobalsName, 8244684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 8254684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage); 8264684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov} 8274684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov 828800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// This function replaces all global variables with new variables that have 829800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// trailing redzones. It also creates a function that poisons 830800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany// redzones and inserts this function into llvm.global_ctors. 8311416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryanybool AddressSanitizerModule::runOnModule(Module &M) { 8321416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany if (!ClGlobals) return false; 8331416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany TD = getAnalysisIfAvailable<DataLayout>(); 8341416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany if (!TD) 8351416edc30adbd53b2be863f7f3de56de4a4c9d0aKostya Serebryany return false; 836b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov BL.reset(new BlackList(BlacklistFile)); 837d6f62c8da5aa4f3388cec1542309ffa623cac601Alexey Samsonov if (BL->isIn(M)) return false; 838b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany C = &(M.getContext()); 83919cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov int LongSize = TD->getPointerSizeInBits(); 84019cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov IntptrTy = Type::getIntNTy(*C, LongSize); 84111af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov Mapping = getShadowMapping(M, LongSize, ZeroBaseShadow); 8424684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov initializeCallbacks(M); 8434684858624d7ffe82379783e9b678227d5e0b515Alexey Samsonov DynamicallyInitializedGlobals.Init(M); 844b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 845800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<GlobalVariable *, 16> GlobalsToChange; 846800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8479b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany for (Module::GlobalListType::iterator G = M.global_begin(), 8489b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany E = M.global_end(); G != E; ++G) { 8499b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (ShouldInstrumentGlobal(G)) 8509b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany GlobalsToChange.push_back(G); 851800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 852800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 853800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t n = GlobalsToChange.size(); 854800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (n == 0) return false; 855800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 856800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A global is described by a structure 857800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t beg; 858800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size; 859800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // size_t size_with_redzone; 860800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // const char *name; 8619b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // size_t has_dynamic_init; 862800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // We initialize an array of such structures and pass it to a run-time call. 863800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy, 8649b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, IntptrTy, 8659b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany IntptrTy, NULL); 8669b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany SmallVector<Constant *, 16> Initializers(n), DynamicInit; 867800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 868b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany 869b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Function *CtorFunc = M.getFunction(kAsanModuleCtorName); 870b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany assert(CtorFunc); 871b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany IRBuilder<> IRB(CtorFunc->getEntryBlock().getTerminator()); 872800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 8739b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // The addresses of the first and last dynamically initialized globals in 8749b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // this TU. Used in initialization order checking. 8759b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany Value *FirstDynamic = 0, *LastDynamic = 0; 8769b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 877800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0; i < n; i++) { 87829f975f8ffda1f5d78cbf2530c2316abef11aa70Kostya Serebryany static const uint64_t kMaxGlobalRedzone = 1 << 18; 879800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *G = GlobalsToChange[i]; 880800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PointerType *PtrTy = cast<PointerType>(G->getType()); 881800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *Ty = PtrTy->getElementType(); 882208a4ff2b56f453910bb817540f34b8169f7702aKostya Serebryany uint64_t SizeInBytes = TD->getTypeAllocSize(Ty); 88329f975f8ffda1f5d78cbf2530c2316abef11aa70Kostya Serebryany uint64_t MinRZ = RedzoneSize(); 88463f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany // MinRZ <= RZ <= kMaxGlobalRedzone 88563f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany // and trying to make RZ to be ~ 1/4 of SizeInBytes. 88629f975f8ffda1f5d78cbf2530c2316abef11aa70Kostya Serebryany uint64_t RZ = std::max(MinRZ, 88763f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany std::min(kMaxGlobalRedzone, 88863f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany (SizeInBytes / MinRZ / 4) * MinRZ)); 88963f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany uint64_t RightRedzoneSize = RZ; 89063f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany // Round up to MinRZ 89163f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany if (SizeInBytes % MinRZ) 89263f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany RightRedzoneSize += MinRZ - (SizeInBytes % MinRZ); 89363f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany assert(((RightRedzoneSize + SizeInBytes) % MinRZ) == 0); 894800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize); 8959b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Determine whether this global should be poisoned in initialization. 896ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany bool GlobalHasDynamicInitializer = 897ca23d43084c45a7d6f4371d62f45be044650ce38Kostya Serebryany DynamicallyInitializedGlobals.Contains(G); 89859a4a47a7bea7cc17877c6a3954ad9f8309ff1cbKostya Serebryany // Don't check initialization order if this global is blacklisted. 8997dadac65d375ff21b7a36bfb7642578d2f467525Kostya Serebryany GlobalHasDynamicInitializer &= !BL->isInInit(*G); 900800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 901800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL); 902800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant *NewInitializer = ConstantStruct::get( 903800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewTy, G->getInitializer(), 904800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Constant::getNullValue(RightRedZoneTy), NULL); 905800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 906a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany SmallString<2048> DescriptionOfGlobal = G->getName(); 907a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += " ("; 908a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += M.getModuleIdentifier(); 909a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany DescriptionOfGlobal += ")"; 910a4b2b1d8fbb84b0b6fac5abce21a2a5c5e907282Kostya Serebryany GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal); 911800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 912800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Create a new global variable with enough space for a redzone. 913800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *NewGlobal = new GlobalVariable( 914800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, NewTy, G->isConstant(), G->getLinkage(), 915ce718ff9f42c7da092eaa01dd0242e8d5ba84713Hans Wennborg NewInitializer, "", G, G->getThreadLocalMode()); 916800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->copyAttributesFrom(G); 91763f0846f1eb43332a08811d332b813276b727eb6Kostya Serebryany NewGlobal->setAlignment(MinRZ); 918800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 919800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Indices2[2]; 920800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[0] = IRB.getInt32(0); 921800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Indices2[1] = IRB.getInt32(0); 922800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 923800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->replaceAllUsesWith( 924f1639abf1aaba1448f719f595156cd0f4cd560ccKostya Serebryany ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true)); 925800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NewGlobal->takeName(G); 926800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany G->eraseFromParent(); 927800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 928800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Initializers[i] = ConstantStruct::get( 929800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalStructTy, 930800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(NewGlobal, IntptrTy), 931800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes), 932800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize), 933800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantExpr::getPointerCast(Name, IntptrTy), 9349b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany ConstantInt::get(IntptrTy, GlobalHasDynamicInitializer), 935800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NULL); 9369b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 9379b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Populate the first and last globals declared in this TU. 938ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov if (CheckInitOrder && GlobalHasDynamicInitializer) { 9399b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany LastDynamic = ConstantExpr::getPointerCast(NewGlobal, IntptrTy); 9409b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany if (FirstDynamic == 0) 9419b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany FirstDynamic = LastDynamic; 9429b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany } 9439b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany 944324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "NEW GLOBAL: " << *NewGlobal << "\n"); 945800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 946800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 947800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n); 948800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany GlobalVariable *AllGlobals = new GlobalVariable( 949800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage, 950800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantArray::get(ArrayOfGlobalStructTy, Initializers), ""); 951800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 9529b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany // Create calls for poisoning before initializers run and unpoisoning after. 953ee548275c63a1eeffda9d3edd2bea04e1dadcc67Alexey Samsonov if (CheckInitOrder && FirstDynamic && LastDynamic) 9549b9f87a87ac1b373c4c6a70904315bebbd01c50cKostya Serebryany createInitializerPoisonCalls(M, FirstDynamic, LastDynamic); 955800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateCall2(AsanRegisterGlobals, 956800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 957800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, n)); 958800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 9597bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // We also need to unregister globals at the end, e.g. when a shared library 9607bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany // gets closed. 9617bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany Function *AsanDtorFunction = Function::Create( 9627bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 9637bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleDtorName, &M); 9647bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction); 9657bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB)); 9667bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB_Dtor.CreateCall2(AsanUnregisterGlobals, 9677bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany IRB.CreatePointerCast(AllGlobals, IntptrTy), 9687bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany ConstantInt::get(IntptrTy, n)); 9697bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalDtors(M, AsanDtorFunction, kAsanCtorAndCtorPriority); 9707bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany 971800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany DEBUG(dbgs() << M); 972800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return true; 973800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 974800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 9758b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryanyvoid AddressSanitizer::initializeCallbacks(Module &M) { 9768b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany IRBuilder<> IRB(*C); 9779db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // Create __asan_report* callbacks. 9789db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessIsWrite = 0; AccessIsWrite <= 1; AccessIsWrite++) { 9799db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany for (size_t AccessSizeIndex = 0; AccessSizeIndex < kNumberOfAccessSizes; 9809db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany AccessSizeIndex++) { 9819db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany // IsWrite and TypeSize are encoded in the function name. 9829db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany std::string FunctionName = std::string(kAsanReportErrorTemplate) + 9839db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany (AccessIsWrite ? "store" : "load") + itostr(1 << AccessSizeIndex); 9844f0c69623c10a3a49f6926fd53694ee532e06a85Kostya Serebryany // If we are merging crash callbacks, they have two parameters. 9857846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany AsanErrorCallback[AccessIsWrite][AccessSizeIndex] = 9867846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany checkInterfaceFunction(M.getOrInsertFunction( 9877846c1c851a53a8280f9d8ed57cd98d82c742551Kostya Serebryany FunctionName, IRB.getVoidTy(), IntptrTy, NULL)); 9889db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 9899db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany } 990ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 991ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany AsanHandleNoReturnFunc = checkInterfaceFunction(M.getOrInsertFunction( 992ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany kAsanHandleNoReturnName, IRB.getVoidTy(), NULL)); 993f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany // We insert an empty inline asm after __asan_report* to avoid callback merge. 994f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false), 995f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany StringRef(""), StringRef(""), 996f7b08226eb44458f6f38cbeaca527028803c725aKostya Serebryany /*hasSideEffects=*/true); 9978b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany} 9988b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany 99919cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonovvoid AddressSanitizer::emitShadowMapping(Module &M, IRBuilder<> &IRB) const { 100011af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov // Tell the values of mapping offset and scale to the run-time. 100111af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov GlobalValue *asan_mapping_offset = 100211af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 100311af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov ConstantInt::get(IntptrTy, Mapping.Offset), 100411af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov kAsanMappingOffsetName); 100511af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov // Read the global, otherwise it may be optimized away. 100611af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov IRB.CreateLoad(asan_mapping_offset, true); 100711af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov 100811af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov GlobalValue *asan_mapping_scale = 100911af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, 101011af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov ConstantInt::get(IntptrTy, Mapping.Scale), 101111af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov kAsanMappingScaleName); 101211af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov // Read the global, otherwise it may be optimized away. 101311af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov IRB.CreateLoad(asan_mapping_scale, true); 101419cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov} 101519cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov 10168b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany// virtual 10178b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryanybool AddressSanitizer::doInitialization(Module &M) { 10188b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany // Initialize the private fields. No one has accessed them before. 10198b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany TD = getAnalysisIfAvailable<DataLayout>(); 10208b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany 10218b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany if (!TD) 10228b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany return false; 1023b0dcf61252e58715a3bea79f4c112572df361c30Alexey Samsonov BL.reset(new BlackList(BlacklistFile)); 10248b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany DynamicallyInitializedGlobals.Init(M); 10258b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany 10268b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany C = &(M.getContext()); 10278b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany LongSize = TD->getPointerSizeInBits(); 10288b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany IntptrTy = Type::getIntNTy(*C, LongSize); 10298b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany 10308b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany AsanCtorFunction = Function::Create( 10318b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany FunctionType::get(Type::getVoidTy(*C), false), 10328b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany GlobalValue::InternalLinkage, kAsanModuleCtorName, &M); 10338b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany BasicBlock *AsanCtorBB = BasicBlock::Create(*C, "", AsanCtorFunction); 10348b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany // call __asan_init in the module ctor. 10358b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany IRBuilder<> IRB(ReturnInst::Create(*C, AsanCtorBB)); 10368b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany AsanInitFunction = checkInterfaceFunction( 10378b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL)); 10388b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany AsanInitFunction->setLinkage(Function::ExternalLinkage); 10398b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany IRB.CreateCall(AsanInitFunction); 10409db5b5ffa9fccd5c7f1f39a3e9aa66cc4a5eedc1Kostya Serebryany 104111af9a873f9e1409a422ab31e22729368805afafAlexey Samsonov Mapping = getShadowMapping(M, LongSize, ZeroBaseShadow); 104219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov emitShadowMapping(M, IRB); 1043800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 10447bcfc9950bac0f411f9671e8d6ce483bd219727eKostya Serebryany appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority); 1045ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany return true; 1046ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany} 1047ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany 1048a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryanybool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) { 1049a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // For each NSObject descendant having a +load method, this method is invoked 1050a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // by the ObjC runtime before any of the static constructors is called. 1051a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // Therefore we need to instrument such methods with a call to __asan_init 1052a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // at the beginning in order to initialize our runtime before any access to 1053a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // the shadow memory. 1054a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // We cannot just ignore these methods, because they may call other 1055a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // instrumented functions. 1056a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany if (F.getName().find(" load]") != std::string::npos) { 1057a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRBuilder<> IRB(F.begin()->begin()); 1058a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany IRB.CreateCall(AsanInitFunction); 1059a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return true; 1060a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany } 1061a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany return false; 1062a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany} 1063a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 1064ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryanybool AddressSanitizer::runOnFunction(Function &F) { 1065800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (BL->isIn(F)) return false; 1066800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (&F == AsanCtorFunction) return false; 1067324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "ASAN instrumenting:\n" << F << "\n"); 10688b390ffbfdd52a23a45a21de99aa1c31f3ce623fKostya Serebryany initializeCallbacks(*F.getParent()); 1069a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 1070a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany // If needed, insert __asan_init before checking for AddressSafety attr. 1071a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany maybeInsertAsanInitAtFunctionEntry(F); 1072a1a8a323f43a95620fc4c6b5aad8d5ff5e5eb590Kostya Serebryany 1073831737d329a727f53a1fb0572f7b7a8127208881Bill Wendling if (!F.getAttributes().hasAttribute(AttributeSet::FunctionIndex, 1074831737d329a727f53a1fb0572f7b7a8127208881Bill Wendling Attribute::AddressSafety)) 10756765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling return false; 1076800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1077800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!ClDebugFunc.empty() && ClDebugFunc != F.getName()) 1078800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return false; 10796765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling 10806765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling // We want to instrument every address only once per basic block (unless there 10816765834754cbb3cb0f15b4b15e98c5e73fa50066Bill Wendling // are calls between uses). 1082800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallSet<Value*, 16> TempsToInstrument; 1083800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallVector<Instruction*, 16> ToInstrument; 108495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany SmallVector<Instruction*, 8> NoReturnCalls; 1085e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany bool IsWrite; 1086800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1087800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Fill the set of memory operations to instrument. 1088800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (Function::iterator FI = F.begin(), FE = F.end(); 1089800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany FI != FE; ++FI) { 1090800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 1091324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany int NumInsnsPerBB = 0; 1092800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); 1093800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BI != BE; ++BI) { 1094bcb55ce3862bbbedac4e09d7099c9e0efc434e4bKostya Serebryany if (LooksLikeCodeInBug11395(BI)) return false; 1095e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (Value *Addr = isInterestingMemoryAccess(BI, &IsWrite)) { 1096800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClOpt && ClOptSameTemp) { 1097800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (!TempsToInstrument.insert(Addr)) 1098800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; // We've seen this temp in the current BB. 1099800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1100800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (isa<MemIntrinsic>(BI) && ClMemIntrin) { 1101800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // ok, take it. 1102800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 110395e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany if (CallInst *CI = dyn_cast<CallInst>(BI)) { 1104800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // A call inside BB. 1105800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany TempsToInstrument.clear(); 1106a17babb021aa9dc3441ecce1ac8a62d2b27edecbKostya Serebryany if (CI->doesNotReturn()) { 110795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany NoReturnCalls.push_back(CI); 110895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 1109800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1110800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany continue; 1111800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1112800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ToInstrument.push_back(BI); 1113324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany NumInsnsPerBB++; 1114324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany if (NumInsnsPerBB >= ClMaxInsnsToInstrumentPerBB) 1115324cbb89f2759fb9ad347bd2af4631e50c39c8f3Kostya Serebryany break; 1116800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1117800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1118800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1119800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Instrument. 1120800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany int NumInstrumented = 0; 1121800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = ToInstrument.size(); i != n; i++) { 1122800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Inst = ToInstrument[i]; 1123800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ClDebugMin < 0 || ClDebugMax < 0 || 1124800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) { 1125e6cf2e0bd09544eeb69665deb908d264e62a71c2Kostya Serebryany if (isInterestingMemoryAccess(Inst, &IsWrite)) 1126ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMop(Inst); 1127800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany else 1128ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany instrumentMemIntrinsic(cast<MemIntrinsic>(Inst)); 1129800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1130800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany NumInstrumented++; 1131800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1132800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 113359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov FunctionStackPoisoner FSP(F, *this); 113459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool ChangedStack = FSP.runOnFunction(); 113595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 113695e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // We must unpoison the stack before every NoReturn call (throw, _exit, etc). 113795e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany // See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37 113895e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) { 113995e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany Instruction *CI = NoReturnCalls[i]; 114095e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany IRBuilder<> IRB(CI); 1141ee4edeccabe1854ee895f52d4ac5588bd5f40c80Kostya Serebryany IRB.CreateCall(AsanHandleNoReturnFunc); 114295e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany } 1143324d96b9e265b0fd8bf63a28340910def64e2164Kostya Serebryany DEBUG(dbgs() << "ASAN done instrumenting:\n" << F << "\n"); 114495e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany 114595e3cf44a9d4672655dee3bd558bfeefa631dd55Kostya Serebryany return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty(); 1146800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1147800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1148800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) { 1149800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 1) return PoisonByte; 1150800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 2) return (PoisonByte << 8) + PoisonByte; 1151800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (ShadowRedzoneSize == 4) 1152800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany return (PoisonByte << 24) + (PoisonByte << 16) + 1153800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany (PoisonByte << 8) + (PoisonByte); 1154858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper llvm_unreachable("ShadowRedzoneSize is either 1, 2 or 4"); 1155800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1156800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1157800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryanystatic void PoisonShadowPartialRightRedzone(uint8_t *Shadow, 1158800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t Size, 1159b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany size_t RZSize, 1160800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany size_t ShadowGranularity, 1161800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint8_t Magic) { 1162b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany for (size_t i = 0; i < RZSize; 1163800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany i+= ShadowGranularity, Shadow++) { 1164800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (i + ShadowGranularity <= Size) { 1165800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = 0; // fully addressable 1166800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else if (i >= Size) { 1167800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Magic; // unaddressable 1168800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } else { 1169800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany *Shadow = Size - i; // first Size-i bytes are addressable 1170800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1171800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1172800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1173800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 117459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// Workaround for bug 11395: we don't want to instrument stack in functions 117559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// with large assembly blobs (32-bit only), otherwise reg alloc may crash. 117659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// FIXME: remove once the bug 11395 is fixed. 117759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovbool AddressSanitizer::LooksLikeCodeInBug11395(Instruction *I) { 117859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (LongSize != 32) return false; 117959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov CallInst *CI = dyn_cast<CallInst>(I); 118059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (!CI || !CI->isInlineAsm()) return false; 118159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (CI->getNumArgOperands() <= 5) return false; 118259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov // We have inline assembly with quite a few arguments. 118359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return true; 118459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov} 118559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 118659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovvoid FunctionStackPoisoner::initializeCallbacks(Module &M) { 118759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IRBuilder<> IRB(*C); 118859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AsanStackMallocFunc = checkInterfaceFunction(M.getOrInsertFunction( 118959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL)); 119059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AsanStackFreeFunc = checkInterfaceFunction(M.getOrInsertFunction( 119159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov kAsanStackFreeName, IRB.getVoidTy(), 119259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IntptrTy, IntptrTy, IntptrTy, NULL)); 119359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AsanPoisonStackMemoryFunc = checkInterfaceFunction(M.getOrInsertFunction( 119459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov kAsanPoisonStackMemoryName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 119559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov AsanUnpoisonStackMemoryFunc = checkInterfaceFunction(M.getOrInsertFunction( 119659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov kAsanUnpoisonStackMemoryName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL)); 119759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov} 119859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 119959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovvoid FunctionStackPoisoner::poisonRedZones( 120059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB, Value *ShadowBase, 120159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool DoPoison) { 120219cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov size_t ShadowRZSize = RedzoneSize() >> Mapping.Scale; 1203800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowRZSize >= 1 && ShadowRZSize <= 4); 1204800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZTy = Type::getIntNTy(*C, ShadowRZSize * 8); 1205800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *RZPtrTy = PointerType::get(RZTy, 0); 1206800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1207800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonLeft = ConstantInt::get(RZTy, 1208800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackLeftRedzoneMagic : 0LL, ShadowRZSize)); 1209800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonMid = ConstantInt::get(RZTy, 1210800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackMidRedzoneMagic : 0LL, ShadowRZSize)); 1211800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PoisonRight = ConstantInt::get(RZTy, 1212800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ValueForPoison(DoPoison ? kAsanStackRightRedzoneMagic : 0LL, ShadowRZSize)); 1213800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1214800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison the first red zone. 1215800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PoisonLeft, IRB.CreateIntToPtr(ShadowBase, RZPtrTy)); 1216800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1217800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // poison all other red zones. 1218b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany uint64_t Pos = RedzoneSize(); 1219800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 1220800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 1221800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 1222800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1223b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany assert(AlignedSize - SizeInBytes < RedzoneSize()); 1224800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *Ptr = NULL; 1225800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1226800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Pos += AlignedSize; 1227800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1228800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(ShadowBase->getType() == IntptrTy); 1229800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (SizeInBytes < AlignedSize) { 1230800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the partial redzone at right 1231800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd( 1232800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ShadowBase, ConstantInt::get(IntptrTy, 123319cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov (Pos >> Mapping.Scale) - ShadowRZSize)); 1234b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany size_t AddressableBytes = RedzoneSize() - (AlignedSize - SizeInBytes); 1235800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint32_t Poison = 0; 1236800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoPoison) { 1237800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany PoisonShadowPartialRightRedzone((uint8_t*)&Poison, AddressableBytes, 1238b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany RedzoneSize(), 123919cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov 1ULL << Mapping.Scale, 1240800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany kAsanStackPartialRedzoneMagic); 1241800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1242800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *PartialPoison = ConstantInt::get(RZTy, Poison); 1243800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(PartialPoison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 1244800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1245800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1246800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the full redzone at right. 1247800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Ptr = IRB.CreateAdd(ShadowBase, 124819cd7e9ce28ed7f3326ebcd386eec215ab3763f9Alexey Samsonov ConstantInt::get(IntptrTy, Pos >> Mapping.Scale)); 12491c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov bool LastAlloca = (i == AllocaVec.size() - 1); 12501c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov Value *Poison = LastAlloca ? PoisonRight : PoisonMid; 1251800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Poison, IRB.CreateIntToPtr(Ptr, RZPtrTy)); 1252800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1253b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Pos += RedzoneSize(); 1254800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1255800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1256800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 125759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovvoid FunctionStackPoisoner::poisonStack() { 125859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov uint64_t LocalStackSize = TotalStackSize + 125959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov (AllocaVec.size() + 1) * RedzoneSize(); 1260800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 126159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov bool DoStackMalloc = ASan.CheckUseAfterReturn 1262800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany && LocalStackSize <= kMaxStackMallocSize; 1263800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 12641c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov assert(AllocaVec.size() > 0); 1265800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *InsBefore = AllocaVec[0]; 1266800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRB(InsBefore); 1267800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1268800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1269800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize); 1270800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *MyAlloca = 1271800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore); 127259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov if (ClRealignStack && StackAlignment < RedzoneSize()) 127359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov StackAlignment = RedzoneSize(); 127459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov MyAlloca->setAlignment(StackAlignment); 1275800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(MyAlloca->isStaticAlloca()); 1276800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy); 1277800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *LocalStackBase = OrigStackBase; 1278800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1279800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1280800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc, 1281800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase); 1282800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1283800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1284800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // This string will be parsed by the run-time (DescribeStackAddress). 1285800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany SmallString<2048> StackDescriptionStorage; 1286800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany raw_svector_ostream StackDescription(StackDescriptionStorage); 1287800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << F.getName() << " " << AllocaVec.size() << " "; 1288800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 12891c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Insert poison calls for lifetime intrinsics for alloca. 12901c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov bool HavePoisonedAllocas = false; 12911c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov for (size_t i = 0, n = AllocaPoisonCallVec.size(); i < n; i++) { 12921c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov const AllocaPoisonCall &APC = AllocaPoisonCallVec[i]; 12931c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov IntrinsicInst *II = APC.InsBefore; 12941c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaInst *AI = findAllocaForValue(II->getArgOperand(1)); 12951c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov assert(AI); 12961c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov IRBuilder<> IRB(II); 12971c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov poisonAlloca(AI, APC.Size, IRB, APC.DoPoison); 12981c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov HavePoisonedAllocas |= APC.DoPoison; 12991c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov } 13001c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov 1301b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany uint64_t Pos = RedzoneSize(); 1302800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Replace Alloca instructions with base+offset. 1303800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) { 1304800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany AllocaInst *AI = AllocaVec[i]; 1305800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t SizeInBytes = getAllocaSizeInBytes(AI); 1306800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StringRef Name = AI->getName(); 1307800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany StackDescription << Pos << " " << SizeInBytes << " " 1308800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany << Name.size() << " " << Name << " "; 1309800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany uint64_t AlignedSize = getAlignedAllocaSize(AI); 1310b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany assert((AlignedSize % RedzoneSize()) == 0); 1311f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov Value *NewAllocaPtr = IRB.CreateIntToPtr( 1312800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)), 1313f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov AI->getType()); 13141afbb517965e29b07cb42e2335d5eadd87de6535Alexey Samsonov replaceDbgDeclareForAlloca(AI, NewAllocaPtr, DIB); 1315f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov AI->replaceAllUsesWith(NewAllocaPtr); 1316b9a12ea0fd92bfdb4c6eb5af333648a618f68686Kostya Serebryany Pos += AlignedSize + RedzoneSize(); 1317800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1318800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany assert(Pos == LocalStackSize); 1319800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1320800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Write the Magic value and the frame description constant to the redzone. 1321800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus0 = IRB.CreateIntToPtr(LocalStackBase, IntptrPtrTy); 1322800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(ConstantInt::get(IntptrTy, kCurrentStackFrameMagic), 1323800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1324800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Value *BasePlus1 = IRB.CreateAdd(LocalStackBase, 132559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov ConstantInt::get(IntptrTy, 132659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov ASan.LongSize/8)); 1327800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy); 13289ce84c1c95c0153a2f33e188ce0db00770425f9eAlexey Samsonov GlobalVariable *StackDescriptionGlobal = 1329a5f54f14435d881b10d8eb65e19fa42af95757e9Kostya Serebryany createPrivateGlobalForString(*F.getParent(), StackDescription.str()); 133059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Value *Description = IRB.CreatePointerCast(StackDescriptionGlobal, 133159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IntptrTy); 1332800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRB.CreateStore(Description, BasePlus1); 1333800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1334800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Poison the stack redzones at the entry. 133559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov Value *ShadowBase = ASan.memToShadow(LocalStackBase, IRB); 133659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov poisonRedZones(AllocaVec, IRB, ShadowBase, true); 1337800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1338800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack before all ret instructions. 1339800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany for (size_t i = 0, n = RetVec.size(); i < n; i++) { 1340800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany Instruction *Ret = RetVec[i]; 1341800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBuilder<> IRBRet(Ret); 1342800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Mark the current frame as retired. 1343800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateStore(ConstantInt::get(IntptrTy, kRetiredStackFrameMagic), 1344800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany BasePlus0); 1345800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany // Unpoison the stack. 134659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov poisonRedZones(AllocaVec, IRBRet, ShadowBase, false); 1347800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany if (DoStackMalloc) { 1348f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // In use-after-return mode, mark the whole stack frame unaddressable. 1349800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany IRBRet.CreateCall3(AsanStackFreeFunc, LocalStackBase, 1350800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany ConstantInt::get(IntptrTy, LocalStackSize), 1351800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany OrigStackBase); 1352f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov } else if (HavePoisonedAllocas) { 1353f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // If we poisoned some allocas in llvm.lifetime analysis, 1354f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // unpoison whole stack frame now. 1355f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov assert(LocalStackBase == OrigStackBase); 1356f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov poisonAlloca(LocalStackBase, LocalStackSize, IRBRet, false); 1357800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1358800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany } 1359800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany 1360bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany // We are done. Remove the old unused alloca instructions. 1361bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany for (size_t i = 0, n = AllocaVec.size(); i < n; i++) 1362bd0052a0f26f04b8fcf59e8f645e5e33751e1f6eKostya Serebryany AllocaVec[i]->eraseFromParent(); 1363800e03f59896ef4b26d988f1878370bb5aeec0d8Kostya Serebryany} 1364f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov 136559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonovvoid FunctionStackPoisoner::poisonAlloca(Value *V, uint64_t Size, 136659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov IRBuilder<> IRB, bool DoPoison) { 1367f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov // For now just insert the call to ASan runtime. 1368f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov Value *AddrArg = IRB.CreatePointerCast(V, IntptrTy); 1369f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov Value *SizeArg = ConstantInt::get(IntptrTy, Size); 1370f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov IRB.CreateCall2(DoPoison ? AsanPoisonStackMemoryFunc 1371f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov : AsanUnpoisonStackMemoryFunc, 1372f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov AddrArg, SizeArg); 1373f985f44b13681071e585acb7a5703a2c1c23b6ceAlexey Samsonov} 137459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 137559cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// Handling llvm.lifetime intrinsics for a given %alloca: 137659cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// (1) collect all llvm.lifetime.xxx(%size, %value) describing the alloca. 137759cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// (2) if %size is constant, poison memory for llvm.lifetime.end (to detect 137859cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// invalid accesses) and unpoison it for llvm.lifetime.start (the memory 137959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// could be poisoned by previous llvm.lifetime.end instruction, as the 138059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// variable may go in and out of scope several times, e.g. in loops). 138159cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// (3) if we poisoned at least one %alloca in a function, 138259cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov// unpoison the whole stack frame at function exit. 138359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov 13841c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey SamsonovAllocaInst *FunctionStackPoisoner::findAllocaForValue(Value *V) { 13851c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (AllocaInst *AI = dyn_cast<AllocaInst>(V)) 13861c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // We're intested only in allocas we can handle. 13871c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov return isInterestingAlloca(*AI) ? AI : 0; 13881c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // See if we've already calculated (or started to calculate) alloca for a 13891c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // given value. 13901c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaForValueMapTy::iterator I = AllocaForValue.find(V); 13911c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (I != AllocaForValue.end()) 13921c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov return I->second; 13931c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Store 0 while we're calculating alloca for value V to avoid 13941c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // infinite recursion if the value references itself. 13951c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaForValue[V] = 0; 13961c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaInst *Res = 0; 13971c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (CastInst *CI = dyn_cast<CastInst>(V)) 13981c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov Res = findAllocaForValue(CI->getOperand(0)); 13991c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov else if (PHINode *PN = dyn_cast<PHINode>(V)) { 14001c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) { 14011c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov Value *IncValue = PN->getIncomingValue(i); 14021c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // Allow self-referencing phi-nodes. 14031c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (IncValue == PN) continue; 14041c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaInst *IncValueAI = findAllocaForValue(IncValue); 14051c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov // AI for incoming values should exist and should all be equal. 14061c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (IncValueAI == 0 || (Res != 0 && IncValueAI != Res)) 14071c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov return 0; 14081c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov Res = IncValueAI; 140959cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 141059cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov } 14111c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov if (Res != 0) 14121c8b825c4396ad9cd38f713d9e9a51adae1d4c4eAlexey Samsonov AllocaForValue[V] = Res; 141359cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov return Res; 141459cca13a80ed78ccbcdaa9bf20381bd48243f2f1Alexey Samsonov} 1415